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1.1 root 1: /*
1.1.1.5 root 2: Hatari - video.c
3:
1.1.1.21 root 4: This file is distributed under the GNU General Public License, version 2
5: or at your option any later version. Read the file gpl.txt for details.
1.1 root 6:
1.1.1.7 root 7: Video hardware handling. This code handling all to do with the video chip.
8: So, we handle VBLs, HBLs, copying the ST screen to a buffer to simulate the
9: TV raster trace, border removal, palette changes per HBL, the 'video address
10: pointer' etc...
1.1 root 11: */
1.1.1.11 root 12:
13: /* 2007/03/xx [NP] Support for cycle precise border removal / hardware scrolling by using */
14: /* Cycles_GetCounterOnWriteAccess (support left/right border and lines with*/
15: /* length of +26, +2, -2, +44, -106 bytes). */
16: /* Add support for 'Enchanted Lands' second removal of right border. */
17: /* More precise support for reading video counter $ff8205/07/09. */
18: /* 2007/04/14 [NP] Precise reloading of $ff8201/03 into $ff8205/07/09 at line 310 on cycle */
19: /* RESTART_VIDEO_COUNTER_CYCLE (ULM DSOTS Demo). */
1.1.1.21 root 20: /* 2007/04/16 [NP] Better Video_CalculateAddress. We must subtract a "magic" 12 cycles to */
1.1.1.11 root 21: /* Cycles_GetCounterOnReadAccess(CYCLES_COUNTER_VIDEO) to get a correct */
1.1.1.21 root 22: /* value (No Cooper's video synchro protection is finally OK :) ). */
1.1.1.11 root 23: /* 2007/04/17 [NP] - Switch to 60 Hz to remove top border on line 33 should occur before */
24: /* LINE_REMOVE_TOP_CYCLE (a few cycles before the HBL) */
25: /* 2007/04/23 [NP] - Slight change in Video_StoreResolution to ignore hi res if the line */
26: /* has left/right border removed -> assume of lo res line. */
27: /* - Handle simultaneous removal of right border and bottom border with */
28: /* the same long switch to 60 Hz (Sync Screen in SNY II). */
29: /* 2007/05/06 [NP] More precise tests for top border's removal. */
1.1.1.15 root 30: /* 2007/05/11 [NP] Add support for med res overscan (No Cooper Greetings). */
1.1.1.11 root 31: /* 2007/05/12 [NP] - LastCycleSync50 and LastCycleSync60 for better top border's removal */
32: /* in Video_EndHBL. */
33: /* - Use VideoOffset in Video_CopyScreenLineColor to handle missing planes */
1.1.1.15 root 34: /* depending on line (med/lo and borders). */
1.1.1.11 root 35: /* 2007/09/25 [NP] Replace printf by calls to HATARI_TRACE. */
36: /* 2007/10/02 [NP] Use the new int.c to add interrupts with INT_CPU_CYCLE / INT_MFP_CYCLE. */
37: /* 2007/10/23 [NP] Add support for 0 byte line (60/50 switch at cycle 56). Allow 5 lines */
38: /* hardscroll (e.g. SHFORSTV.EXE by Paulo Simmoes). */
1.1.1.15 root 39: /* 2007/10/31 [NP] Use BORDERMASK_LEFT_OFF_MED when left border is removed with hi/med */
1.1.1.11 root 40: /* switch (ST CNX in PYM). */
41: /* 2007/11/02 [NP] Add support for 4 pixel hardware scrolling ("Let's Do The Twist" by */
42: /* ST CNX in Punish Your Machine). */
1.1.1.15 root 43: /* 2007/11/05 [NP] Depending on the position of the med res switch, the planes will be */
44: /* shifted when doing med res overscan (Best Part Of the Creation in PYM */
1.1.1.11 root 45: /* or No Cooper Greetings). */
1.1.1.15 root 46: /* 2007/11/30 [NP] A hi/med switch to remove the left border can be either used to initiate*/
47: /* a right hardware scrolling in low res (St Cnx) or a complete med res */
1.1.1.11 root 48: /* overscan line (Dragonnels Reset Part). */
49: /* Use bit 0-15, 16-19 and 20-23 in ScreenBorderMask[] to track border */
50: /* trick, STF hardware scrolling and plane shifting. */
51: /* 2007/12/22 [NP] Very precise values for VBL_VIDEO_CYCLE_OFFSET, HBL_VIDEO_CYCLE_OFFSET */
52: /* TIMERB_VIDEO_CYCLE_OFFSET and RESTART_VIDEO_COUNTER_CYCLE. These values */
53: /* were calculated using sttiming.s on a real STF and should give some very*/
54: /* accurate results (also uses 56 cycles instead of 44 to process an */
1.1.1.13 root 55: /* HBL/VBL/MFP exception). */
1.1.1.11 root 56: /* 2007/12/29 [NP] Better support for starting line 2 bytes earlier (if the line starts in */
57: /* 60 Hz and goes back to 50 Hz later), when combined with top border */
58: /* removal (Mindbomb Demo - D.I. No Shit). */
59: /* 2007/12/30 [NP] Slight improvement of VideoAdress in Video_CalculateAddress when reading*/
60: /* during the top border. */
61: /* Correct the case where removing top border on line 33 could also be */
62: /* interpreted as a right border removal (which is not possible since the */
63: /* display is still off at that point). */
64: /* 2008/01/03 [NP] Better handling of nStartHBL and nEndHBL when switching freq from */
65: /* 50 to 60 Hz. Allows emulation of a "short" 50 Hz screen of 171 lines */
66: /* and a more precise removal of bottom border in 50 and 60 Hz. */
67: /* 2008/01/04 [NP] More generic detection for removing 2 bytes to the right of the line */
68: /* when switching from 60 to 50 Hz (works even with a big number of cycles */
69: /* between the freq changes) (Phaleon's Menus). */
70: /* 2008/01/06 [NP] More generic detection for stopping the display in the middle of a line */
71: /* with a hi / lo res switch (-106 bytes per line). Although switch to */
72: /* hi res should occur at cycle 160, some demos use 164 (Phaleon's Menus). */
73: /* 2008/01/06 [NP] Better bottom border's removal in 50 Hz : switch to 60 Hz must occur */
74: /* before cycle LINE_REMOVE_BOTTOM_CYCLE on line 263 and switch back to 50 */
75: /* Hz must occur after LINE_REMOVE_BOTTOM_CYCLE on line 263 (this means */
76: /* we can already be in 50 Hz when Video_EndHBL is called and still remove */
77: /* the bottom border). This is similar to the tests used to remove the */
78: /* top border. */
79: /* 2008/01/12 [NP] In Video_SetHBLPaletteMaskPointers, consider that if a color's change */
80: /* occurs after cycle LINE_END_CYCLE_NO_RIGHT, then it's related to the */
81: /* next line. */
82: /* FIXME : it would be better to handle all color changes through spec512.c*/
83: /* and drop the 16 colors palette per line. */
84: /* FIXME : we should use Cycles_GetCounterOnWriteAccess, but it doesn't */
85: /* support multiple accesses like move.l or movem. */
86: /* 2008/01/12 [NP] Handle 60 Hz switch during the active display of the last line to remove*/
87: /* the bottom border : this should also shorten line by 2 bytes (F.N.I.L. */
88: /* Demo by TNT). */
89: /* 2008/01/15 [NP] Don't do 'left+2' if switch back to 50 Hz occurs when line is not active*/
90: /* (after cycle LINE_END_CYCLE_60) (XXX International Demos). */
91: /* 2008/01/31 [NP] Improve left border detection : allow switch to low res on cycle <= 28 */
92: /* instead of <= 20 (Vodka Demo Main Menu). */
93: /* 2008/02/02 [NP] Added 0 byte line detection when switching hi/lo res at position 28 */
94: /* (Lemmings screen in Nostalgic-o-demo). */
95: /* 2008/02/03 [NP] On STE, write to video counter $ff8205/07/09 should only be applied */
1.1.1.21 root 96: /* immediately if display has not started for the line (before cycle */
1.1.1.11 root 97: /* LINE_END_CYCLE_50). If write occurs after, the change to pVideoRaster */
98: /* should be delayed to the end of the line, after processing the current */
99: /* line with Video_CopyScreenLineColor (Stardust Tunnel Demo). */
100: /* 2008/02/04 [NP] The problem is similar when writing to hwscroll $ff8264, we must delay */
101: /* the change until the end of the line if display was already started */
102: /* (Mindrewind by Reservoir Gods). */
103: /* 2008/02/06 [NP] On STE, when left/right borders are off and hwscroll > 0, we must read */
104: /* 6 bytes less than the expected value (E605 by Light). */
105: /* 2008/02/17 [NP] In Video_CopyScreenLine, LineWidth*2 bytes should be added after */
106: /* pNewVideoRaster is copied to pVideoRaster (Braindamage Demo). */
107: /* When reading a byte at ff8205/07/09, all video address bytes should be */
108: /* updated in Video_ScreenCounter_ReadByte, not just the byte that was */
109: /* read. Fix programs that just modify one byte in the video address */
110: /* counter (e.g. sub #1,$ff8207 in Braindamage Demo). */
111: /* 2008/02/19 [NP] In Video_CalculateAddress, use pVideoRaster instead of VideoBase to */
112: /* determine the video address when display is off in the upper part of */
113: /* the screen (in case ff8205/07/09 were modified on STE). */
114: /* 2008/02/20 [NP] Better handling in Video_ScreenCounter_WriteByte by changing only one */
115: /* byte and keeping the other (Braindamage End Part). */
116: /* 2008/03/08 [NP] Use M68000_INT_VIDEO when calling M68000_Exception(). */
117: /* 2008/03/13 [NP] On STE, LineWidth value in $ff820f is added to the shifter counter just */
118: /* when display is turned off on a line (when right border is started, */
119: /* which is usually on cycle 376). */
1.1.1.21 root 120: /* This means a write to $ff820f should be applied immediately only if it */
1.1.1.11 root 121: /* occurs before cycle LineEndCycle. Else, it is stored in NewLineWidth */
122: /* and used after Video_CopyScreenLine has processed the current line */
123: /* (improve the bump mapping part in Pacemaker by Paradox). */
124: /* LineWidth should be added to pVideoRaster before checking the possible */
125: /* modification of $ff8205/07/09 in Video_CopyScreenLine. */
126: /* 2008/03/14 [NP] Rename ScanLineSkip to LineWidth (more consistent with STE docs). */
127: /* On STE, better support for writing to video counter, line width and */
128: /* hw scroll. If write to register occurs just at the start of a new line */
129: /* but before Video_EndHBL (because the move started just before cycle 512)*/
1.1.1.21 root 130: /* then the new value should not be set immediately but stored and set */
1.1.1.11 root 131: /* during Video_EndHBL (fix the bump mapping part in Pacemaker by Paradox).*/
1.1.1.12 root 132: /* 2008/03/25 [NP] On STE, when bSteBorderFlag is true, we should add 16 pixels to the left*/
133: /* border, not to the right one (Just Musix 2 Menu by DHS). */
134: /* 2008/03/26 [NP] Clear the rest of the border when using border tricks left+2, left+8 */
135: /* or right-106 (remove garbage pixels when hatari resolution changes). */
136: /* 2008/03/29 [NP] Function Video_SetSystemTimings to use different values depending on */
137: /* the machine type. On STE, top/bottom border removal can occur at cycle */
138: /* 500 instead of 504 on STF. */
1.1.1.13 root 139: /* 2008/04/02 [NP] Correct a rare case in Video_Sync_WriteByte at the end of line 33 : */
140: /* nStartHBL was set to 33 instead of 64, which gave a wrong address in */
141: /* Video_CalculateAddress. */
142: /* 2008/04/04 [NP] The value of RestartVideoCounterCycle is slightly different between */
143: /* an STF and an STE. */
144: /* 2008/04/05 [NP] The value of VblVideoCycleOffset is different of 4 cycles between */
145: /* STF and STE (fix end part in Pacemaker by Paradox). */
146: /* 2008/04/09 [NP] Preliminary support for lines using different frequencies in the same */
147: /* screen. In Video_InterruptHandler_EndLine, if the current freq is 50 Hz,*/
148: /* then next int should be scheduled in 512 cycles ; if freq is 60 Hz, */
149: /* next int should be in 508 cycles (used by timer B event count mode). */
150: /* 2008/04/10 [NP] Update LineEndCycle after changing freq to 50 or 60 Hz. */
151: /* Set EndLine interrupt to happen 28 cycles after LineEndCycle. This way */
152: /* Timer B occurs at cycle 404 in 50 Hz, or cycle 400 in 60 Hz (improve */
153: /* flickering bottom border in B.I.G. Demo screen 1). */
154: /* 2008/04/12 [NP] In the case of a 'right-2' line, we should not change the EndLine's int */
155: /* position when switching back to 50 Hz ; the int should happen at */
156: /* position LINE_END_CYCLE_60 + 28 (Anomaly Demo main menu). */
157: /* 2008/05/31 [NP] Ignore consecutives writes of the same value in the freq/res register. */
158: /* Only the 1st write matters, else this could confuse the code to remove */
159: /* top/bottom border (fix OSZI.PRG demo by ULM). */
160: /* 2008/06/07 [NP] In Video_SetHBLPaletteMaskPointers, use LineStartCycle instead of the */
161: /* 50 Hz constant SCREEN_START_CYCLE. */
162: /* Rename SCREEN_START_HBL_xxx to VIDEO_START_HBL_xxx. */
163: /* Rename SCREEN_END_HBL_xxx to VIDEO_END_HBL_xxx. */
164: /* Rename SCREEN_HEIGHT_HBL_xxx to VIDEO_HEIGHT_HBL_xxx. */
165: /* Use VIDEO_HEIGHT_BOTTOM_50HZ instead of OVERSCAN_BOTTOM. */
166: /* 2008/06/16 [NP] When Hatari is configured to display the screen's borders, 274 lines */
167: /* will be rendered on screen, but if the shifter is in 60 Hz, the last */
168: /* 16 lines will never be used, which can leave some bad pixels on */
169: /* screen. We clear the remaining lines before calling 'Screen_Draw'. */
170: /* (in FNIL by Delta Force, fix flickering gfx in the bottom border of the */
171: /* F2 screen : last 16 lines were the ones from the menu where bottom */
172: /* border was removed ). */
173: /* 2008/06/26 [NP] Improve STE scrolling : handle $ff8264 (no prefetch) and $ff8265 */
174: /* (prefetch). See Video_HorScroll_Write for details on both registers. */
175: /* More generic support for starting display 16 pixels earlier on STE */
176: /* by writing to $ff8265 and settting $ff8264=0 just after. */
177: /* (fix Digiworld 2 by ICE, which uses $ff8264 for horizontal scroll). */
178: /* 2008/07/07 [NP] Ignore other 50/60 Hz switches once the right border was removed, keep */
179: /* the timer B to occur at pos 460+28 (fix Oxygene screen in Transbeauce 2)*/
180: /* 2008/07/14 [NP] When removing only left border in 60Hz, line size is 26+158 bytes */
181: /* instead of 26+160 bytes in 50 Hz (HigResMode demo by Paradox). */
182: /* 2008/07/19 [NP] If $ff8260==3 (which is not a valid resolution mode), we use 0 instead */
183: /* (low res) (fix Omegakul screen in old Omega Demo from 1988). */
184: /* 2008/09/05 [NP] No need to test 60/50 switch if HblCounterVideo < nStartHBL (display */
185: /* has not started yet). */
186: /* 2008/09/25 [NP] Use nLastVisibleHbl to store the number of the last hbl line that should*/
187: /* be copied to the emulator's screen buffer. */
1.1.1.21 root 188: /* On STE, allow to change immediately video address, hw scroll and */
1.1.1.13 root 189: /* linewidth when nHBL>=nLastVisibleHbl instead of nHBL>=nEndHBL */
190: /* (fix Power Rise / Xtrem D demo). */
191: /* 2008/11/15 [NP] For STE registers, add in the TRACE call if the write is delayed or */
192: /* not (linewidth, hwscroll, video address). */
193: /* On STE, allow to change linewdith, hwscroll and video address with no */
194: /* delay as soon as nHBL >= nEndHBL (revert previous changes). Power Rise */
195: /* is still working due to NewHWScrollCount=-1 when setting immediate */
196: /* hwscroll. Fix regression in Braindamage. */
1.1.1.14 root 197: /* 2008/11/29 [NP] Increment jitter's index for HBL and VBL each time a possible interrupt */
198: /* occurs. Each interrupt can have a jitter between 0, 4 and 8 cycles ; the*/
199: /* jitter follows a predefined pattern of 5 values. The HBL and the VBL */
200: /* have their own pattern. See InterruptAddJitter() in uae-cpu/newcpu.c */
201: /* (fix Fullscreen tunnel in Suretrip 49% by Checkpoint and digi sound in */
202: /* Swedish New Year's TCB screen). */
203: /* 2008/12/10 [NP] Enhance support for 0 byte line. The 60/50 Hz switch can happen at */
204: /* cycles 56/64, but also at 58/66 (because access to $ff820a doesn't */
205: /* require to be on a 4 cycles boundary). As hatari doesn't handle */
206: /* multiple of 2 cycles, we allow cycles 56/64 and 60/68 (fix nosync.tos */
207: /* that uses the STOP instruction to produce a 0 byte line on the first */
208: /* displayed line (found on atari-forum.com)). */
1.1.1.17 root 209: /* 2008/12/26 [NP] When reading $ff8260 on STF, set unused bits to 1 instead of 0 */
1.1.1.14 root 210: /* (fix wrong TOS resolution in Awesome Menu Disk 16). */
211: /* Set unused bit to 1 when reading $ff820a too. */
212: /* 2009/01/16 [NP] Handle special case when writing only in upper byte of a color reg. */
213: /* 2009/01/21 [NP] Implement STE horizontal scroll for medium res (fixes cool_ste.prg). */
214: /* Take the current res into account in Video_CopyScreenLineColor to */
1.1.1.15 root 215: /* allow mixing low/med res with horizontal scroll on STE. */
216: /* 2009/01/24 [NP] Better detection of 'right-2' when freq is changed to 60 Hz and */
217: /* restored to 50 after the end of the current line (fixes games menu on */
218: /* BBC compil 10). */
219: /* 2009/01/31 [NP] Handle a rare case where 'move.b #8,$fffa1f' to start the timer B is */
220: /* done just a few cycles before the actual signal for end of line. In that*/
221: /* case we must ensure that the write was really effective before the end */
222: /* of line (else no interrupt should be made) (fix Pompey Pirate Menu #57).*/
223: /* 2009/02/08 [NP] Handle special case for simultaneous HBL exceptions (fixes flickering in*/
224: /* Monster Business and Super Monaco GP). */
225: /* 2009/02/25 [NP] Ignore other 50/60 Hz switches after display was stopped in the middle */
226: /* of the line with a hi/lo switch. Correct missing end of line timer B */
227: /* interrupt in that case (fix flickering Dragon Ball part in Blood disk 2 */
228: /* by Holocaust). */
229: /* 2008/02/02 [NP] Added 0 byte line detection in STE mode when switching hi/lo res */
230: /* at position 32 (Lemmings screen in Nostalgic-o-demo). */
231: /* 2009/03/28 [NP] Depending on bit 3 of MFP's AER, timer B will count end of line events */
232: /* (bit=0) or start of line events (bit=1) (fix Seven Gates Of Jambala). */
233: /* 2009/04/02 [NP] Add another method to obtain a 0 byte line, by switching to hi/lo res */
234: /* at position 500/508 (fix the game No Buddies Land). */
235: /* 2009/04/xx [NP] Rewrite of many parts : add SHIFTER_FRAME structure, better accuracy */
236: /* when mixing 50/60 Hz lines and reading $ff8209, better emulation of */
237: /* HBL and Timer B position when changing freq/res, better emulation of */
238: /* freq changes for top/bottom/right borders. */
239: /* 2009/07/16 [NP] In Video_SetHBLPaletteMaskPointers, if LineCycle>460 we consider the */
240: /* color's change should be applied to next line (used when spec512 mode */
241: /* if off). */
1.1.1.16 root 242: /* 2009/10/31 [NP] Depending on the overscan mode, the displayed lines must be shifted */
243: /* left or right (fix Spec 512 images in the Overscan Demos, fix pixels */
244: /* alignment in screens mixing normal lines and overscan lines). */
245: /* 2009/12/02 [NP] If we switch hi/lo around position 464 (as in Enchanted Lands) and */
246: /* right border was not removed, then we get an empty line on the next */
247: /* HBL (fix Pax Plax Parralax in Beyond by Kruz). */
248: /* 2009/12/06 [NP] Add support for STE 224 bytes overscan without stabiliser by switching */
249: /* hi/lo at cycle 504/4 to remove left border (fix More Or Less Zero and */
250: /* Cernit Trandafir by DHS, as well as Save The Earth by Defence Force). */
251: /* 2009/12/13 [NP] Improve STE 224 bytes lines : correctly set leftmost 16 pixels to color */
252: /* 0 and correct small glitches when combined with hscroll ($ff8264). */
253: /* 2009/12/13 [NP] Line scrolling caused by hi/lo switch (STF_PixelScroll) should be */
254: /* applied after STE's hardware scrolling, else in overscan 4 color 0 */
255: /* pixels will appear in the right border (because overscan shift the */
256: /* whole displayed area 4 pixels to the left) (fix possible regression on */
257: /* STE introduced on 2009/10/31). */
258: /* 2010/01/10 [NP] In Video_CalculateAddress, take bSteBorderFlag into account (+16 pixels */
259: /* in left border on STE). */
260: /* 2010/01/10 [NP] In Video_CalculateAddress, take HWScrollPrefetch into account (shifter */
261: /* starts 16 pixels earlier) (fix EPSS demo by Unit 17). */
262: /* 2010/02/05 [NP] In Video_CalculateAddress, take STE's LineWidth into account when */
263: /* display is disabled in the right border (fix flickering in Utopos). */
264: /* 2010/02/07 [NP] Better support for modifying $ff8205/07/09 while display is on */
265: /* (fix EPSS demo by Unit 17). */
266: /* 2010/04/12 [NP] Improve timings when writing to $ff8205/07/09 when hscroll is used, */
267: /* using Video_GetMMUStartCycle (fix Pacemaker's Bump Part by Paradox). */
268: /* 2010/05/02 [NP] In Video_ConvertPosition, handle the case where we read the position */
269: /* between the last HBL and the start of the next VBL. During 64 cycles */
270: /* FrameCycles can be >= CYCLES_PER_FRAME (harmless fix, only useful when */
271: /* using --trace to get correct positions in the logs). */
272: /* 2010/05/04 [NP] Improve Video_ConvertPosition, use CyclesPerVBL instead of evaluating */
273: /* CYCLES_PER_FRAME (whose value could have changed this the start of the */
274: /* VBL). */
275: /* 2010/05/15 [NP] In Video_StartInterrupts() when running in monochrome (224 cycles per */
276: /* line), the VBL could sometimes be delayed by 160 cycles (divs) and */
277: /* hbl/timer B interrupts for line 0 were not called, which could cause an */
278: /* assert/crash in Hatari when setting timer B on line 2. */
279: /* If we detect VBL was delayed too much, we add hbl/timer b in the next */
280: /* 4 cycles. */
1.1.1.17 root 281: /* 2010/07/05 [NP] When removing left border, allow up to 32 cycles between hi and low */
282: /* res switching (fix Megabeer by Invizibles). */
283: /* 2010/11/01 [NP] On STE, the 224 bytes overscan will shift the screen 8 pixels to the */
284: /* left. */
285: /* For 230 bytes overscan, handle scrolling prefetching when computing */
286: /* pVideoRaster for the next line. */
287: /* 2010/12/12 [NP] In Video_CopyScreenLineColor, use pVideoRasterEndLine to improve */
288: /* STE's horizontal scrolling for any line's length (160, 224, 230, ...). */
289: /* Fix the last 16 pixels for 224 bytes overscan (More Or Less Zero and */
290: /* Cernit Trandafir by DHS, Save The Earth by Defence Force). */
291: /* 2011/04/03 [NP] Call DmaSnd_HBL_Update() on each HBL to handle programs that modify */
292: /* the samples data while those data are played by the DMA sound. */
293: /* (fixes the game Power Up Plus and the demo Mental Hangover). */
1.1.1.18 root 294: /* 2011/07/30 [NP] Add blank line detection in STF mode when switching 60/50 Hz at cycle */
295: /* 28. The shifter will still read bytes and border removal is possible, */
296: /* but the line will be blank (we use color 0 for now, but the line should */
297: /* be black). */
298: /* (fix spectrum 512 part in Overscan Demo and shforstv by Paulo Simoes */
299: /* by removing "parasite" pixels on the 1st line). */
300: /* 2011/11/17 [NP] Improve timings used for the 0 byte line when switching hi/lo at the */
301: /* end of the line. The hi/lo switch can be at 496/508 or 500/508 */
302: /* (fix NGC screen in Delirious Demo IV). */
303: /* 2011/11/18 [NP] Add support for another method to do 4 pixel hardware scrolling by doing*/
304: /* a med/lo switch after the hi/lo switch to remove left border */
305: /* (fix NGC screen in Delirious Demo IV). */
306: /* 2011/11/19 [NP] The 0 byte line obtained by switching hi/lo at the end of the line has */
307: /* no video signal at all (blank). In that case, the screen is shifted one */
308: /* line down, and bottom border removal will happen one line later too */
309: /* (fix NGC screen in Delirious Demo IV). */
1.1.1.19 root 310: /* 2012/01/11 [NP] Don't remove left border when the hi/lo switch is made at cycle >= 12 */
311: /* (fix 'Kill The Beast 2' in the Vodka Demo) */
1.1.1.20 root 312: /* 2012/05/19 [NP] Allow bottom border to be removed when switch back to 50 Hz is made at */
313: /* cycle 504 and more (instead of 508 and more). Same for top border */
314: /* (fix 'Musical Wonders 1990' by Offbeat). */
1.1.1.21 root 315: /* 2013/03/05 [NP] An extra 4 cycle delay is added by the MFP to set IRQ when the timer B */
316: /* expires in event count mode. Update TIMERB_VIDEO_CYCLE_OFFSET to 24 */
317: /* cycles instead of 28 to compensate for this and keep the same position. */
318: /* 2013/04/26 [NP] Cancel changes from 2012/05/19, 'Musical Wonders 1990' is really broken */
319: /* on a real STF and bottom border is not removed. */
320: /* 2013/05/03 [NP] Add support for IACK sequence when handling HBL/VBL exceptions. Allow */
321: /* to handle the case where interrupt pending bit is set twice (correct */
322: /* fix for Super Monaco GP, Super Hang On, Monster Business, European */
323: /* Demo's Intro, BBC Menu 52). */
1.1.1.22! root 324: /* 2013/07/17 [NP] Handle a special case when writing only in lower byte of a color reg. */
! 325: /* 2013/12/02 [NP] If $ff8260==3 (which is not a valid resolution mode), we use 2 instead */
! 326: /* (high res) (cancel wrong change from 2008/07/19 and fix 'The World Is */
! 327: /* My Oyster - Convention Report Part' by Aura). */
! 328: /* 2013/12/24 [NP] In Video_ColorReg_ReadWord, randomly return 0 or 1 for unused bits */
! 329: /* in STF's color registers (fix 'UMD 8730' by PHF in STF mode) */
! 330: /* 2013/12/28 [NP] For bottom border removal on a 60 Hz screen, max position to go back */
! 331: /* to 60 Hz should be 4 cycles earlier, as a 60 Hz line starts 4 cycles */
! 332: /* earlier (fix STE demo "It's a girl 2" by Paradox). */
! 333: /* 2014/02/22 [NP] In Video_ColorReg_ReadWord(), don't set unused STF bits to rand() if */
! 334: /* the PC is not executing from the RAM between 0 and 4MB (fix 'Union Demo'*/
! 335: /* 2014/03/21 [NP] For STE in med res overscan at 60 Hz, add a 3 pixels shift to have */
! 336: /* bitmaps and color changes synchronised (fix 'HighResMode' by Paradox). */
! 337: /* protection code running at address $ff8240). */
! 338: /* 2014/05/08 [NP] In case we're mixing 50 Hz and 60 Hz lines (512 or 508 cycles), we must */
! 339: /* update the position where the VBL interrupt will happen (fix "keyboard */
! 340: /* no jitter" test program by Nyh, with 4 lines at 60 Hz and 160240 cycles */
! 341: /* per VBL). */
! 342: /* 2014/05/31 [NP] Ensure pVideoRaster always points into a 24 bit space region. In case */
! 343: /* video address at $ff8201/03 is set into IO space $ffxxxx, the new value */
! 344: /* for video pointer should not be >= $1000000 (fix "Leavin' Teramis" */
! 345: /* which sets video address to $ffe100 to display "loading please wait". */
! 346: /* In that case, we must display $ffe100-$ffffff then $0-$5e00) */
1.1.1.11 root 347:
1.1.1.12 root 348:
1.1.1.15 root 349: const char Video_fileid[] = "Hatari video.c : " __DATE__ " " __TIME__;
1.1 root 350:
1.1.1.7 root 351: #include <SDL_endian.h>
1.1.1.4 root 352:
1.1 root 353: #include "main.h"
1.1.1.6 root 354: #include "configuration.h"
1.1.1.10 root 355: #include "cycles.h"
1.1 root 356: #include "fdc.h"
1.1.1.16 root 357: #include "cycInt.h"
1.1.1.8 root 358: #include "ioMem.h"
1.1.1.4 root 359: #include "keymap.h"
1.1 root 360: #include "m68000.h"
1.1.1.21 root 361: #include "hatari-glue.h"
1.1 root 362: #include "memorySnapShot.h"
363: #include "mfp.h"
1.1.1.11 root 364: #include "printer.h"
1.1 root 365: #include "screen.h"
1.1.1.13 root 366: #include "screenSnapShot.h"
1.1 root 367: #include "shortcut.h"
368: #include "sound.h"
1.1.1.17 root 369: #include "dmaSnd.h"
1.1 root 370: #include "spec512.h"
371: #include "stMemory.h"
372: #include "vdi.h"
373: #include "video.h"
374: #include "ymFormat.h"
1.1.1.11 root 375: #include "falcon/videl.h"
376: #include "falcon/hostscreen.h"
1.1.1.16 root 377: #include "avi_record.h"
1.1.1.21 root 378: #include "ikbd.h"
1.1.1.22! root 379: #include "floppy_ipf.h"
1.1.1.4 root 380:
381:
1.1.1.11 root 382: /* The border's mask allows to keep track of all the border tricks */
383: /* applied to one video line. The masks for all lines are stored in the array */
384: /* ScreenBorderMask[]. */
385: /* - bits 0-15 are used to describe the border tricks. */
386: /* - bits 20-23 are used to store the bytes offset to apply for some particular */
1.1.1.15 root 387: /* tricks (for example med res overscan can shift display by 0 or 2 bytes */
388: /* depending on when the switch to med res is done after removing the left */
1.1.1.11 root 389: /* border). */
390:
1.1.1.14 root 391: #define BORDERMASK_NONE 0x00 /* no effect on this line */
1.1.1.11 root 392: #define BORDERMASK_LEFT_OFF 0x01 /* removal of left border with hi/lo res switch -> +26 bytes */
393: #define BORDERMASK_LEFT_PLUS_2 0x02 /* line starts earlier in 60 Hz -> +2 bytes */
394: #define BORDERMASK_STOP_MIDDLE 0x04 /* line ends in hires at cycle 160 -> -106 bytes */
395: #define BORDERMASK_RIGHT_MINUS_2 0x08 /* line ends earlier in 60 Hz -> -2 bytes */
396: #define BORDERMASK_RIGHT_OFF 0x10 /* removal of right border -> +44 bytes */
397: #define BORDERMASK_RIGHT_OFF_FULL 0x20 /* full removal of right border and next left border -> +22 bytes */
1.1.1.15 root 398: #define BORDERMASK_OVERSCAN_MED_RES 0x40 /* some borders were removed and the line is in med res instead of low res */
1.1.1.11 root 399: #define BORDERMASK_EMPTY_LINE 0x80 /* 60/50 Hz switch prevents the line to start, video counter is not incremented */
1.1.1.15 root 400: #define BORDERMASK_LEFT_OFF_MED 0x100 /* removal of left border with hi/med res switch -> +26 bytes (for 4 pixels hardware scrolling) */
1.1.1.16 root 401: #define BORDERMASK_LEFT_OFF_2_STE 0x200 /* shorter removal of left border with hi/lo res switch -> +20 bytes (STE only)*/
1.1.1.18 root 402: #define BORDERMASK_BLANK_LINE 0x400 /* 60/50 Hz switch blanks the rest of the line, but video counter is still incremented */
1.1.1.11 root 403:
404:
405: int STRes = ST_LOW_RES; /* current ST resolution */
406: int TTRes; /* TT shifter resolution mode */
1.1.1.13 root 407: int nFrameSkips; /* speed up by skipping video frames */
1.1.1.9 root 408:
1.1.1.13 root 409: bool bUseHighRes; /* Use hi-res (ie Mono monitor) */
1.1 root 410: int OverscanMode; /* OVERSCANMODE_xxxx for current display frame */
1.1.1.17 root 411: Uint16 HBLPalettes[HBL_PALETTE_LINES]; /* 1x16 colour palette per screen line, +1 line just incase write after line 200 */
1.1.1.8 root 412: Uint16 *pHBLPalettes; /* Pointer to current palette lists, one per HBL */
1.1.1.17 root 413: Uint32 HBLPaletteMasks[HBL_PALETTE_MASKS]; /* Bit mask of palette colours changes, top bit set is resolution change */
1.1.1.9 root 414: Uint32 *pHBLPaletteMasks;
1.1.1.15 root 415: int nScreenRefreshRate = 50; /* 50 or 60 Hz in color, 71 Hz in mono */
1.1.1.8 root 416: Uint32 VideoBase; /* Base address in ST Ram for screen (read on each VBL) */
1.1.1.9 root 417:
1.1.1.11 root 418: int nVBLs; /* VBL Counter */
419: int nHBL; /* HBL line */
420: int nStartHBL; /* Start HBL for visible screen */
421: int nEndHBL; /* End HBL for visible screen */
1.1.1.10 root 422: int nScanlinesPerFrame = 313; /* Number of scan lines per frame */
423: int nCyclesPerLine = 512; /* Cycles per horizontal line scan */
1.1.1.13 root 424: static int nFirstVisibleHbl = FIRST_VISIBLE_HBL_50HZ; /* The first line of the ST screen that is copied to the PC screen buffer */
425: static int nLastVisibleHbl = FIRST_VISIBLE_HBL_50HZ+NUM_VISIBLE_LINES; /* The last line of the ST screen that is copied to the PC screen buffer */
1.1.1.16 root 426: static int CyclesPerVBL = 313*512; /* Number of cycles per VBL */
1.1.1.10 root 427:
1.1.1.13 root 428: static Uint8 HWScrollCount; /* HW scroll pixel offset, STE only (0...15) */
429: static int NewHWScrollCount = -1; /* Used in STE mode when writing to the scrolling registers $ff8264/65 */
430: static Uint8 HWScrollPrefetch; /* 0 when scrolling with $ff8264, 1 when scrolling with $ff8265 */
431: static int NewHWScrollPrefetch = -1; /* Used in STE mode when writing to the scrolling registers $ff8264/65 */
432: static Uint8 LineWidth; /* Scan line width add, STe only (words, minus 1) */
433: static int NewLineWidth = -1; /* Used in STE mode when writing to the line width register $ff820f */
1.1.1.16 root 434: static int VideoCounterDelayedOffset = 0; /* Used in STE mode when changing video counter while display is on */
435: static Uint8 *pVideoRasterDelayed = NULL; /* Used in STE mode when changing video counter while display is off in the right border */
1.1.1.13 root 436: static Uint8 *pVideoRaster; /* Pointer to Video raster, after VideoBase in PC address space. Use to copy data on HBL */
1.1.1.15 root 437: static bool bSteBorderFlag; /* true when screen width has been switched to 336 (e.g. in Obsession) */
1.1.1.13 root 438: static int NewSteBorderFlag = -1; /* New value for next line */
1.1.1.21 root 439: static bool bTTColorsSync, bTTColorsSTSync; /* whether TT colors need conversion to SDL */
440:
441: bool bTTSampleHold = false; /* TT special video mode */
442: static bool bTTHypermono = false; /* TT special video mode */
443:
444: static int TTSpecialVideoMode = 0; /* TT special video mode */
445: static int nPrevTTSpecialVideoMode = 0; /* TT special video mode */
1.1 root 446:
1.1.1.17 root 447: static int LastCycleScroll8264; /* value of Cycles_GetCounterOnWriteAccess last time ff8264 was set for the current VBL */
448: static int LastCycleScroll8265; /* value of Cycles_GetCounterOnWriteAccess last time ff8265 was set for the current VBL */
449:
450: static int LineRemoveTopCycle = LINE_REMOVE_TOP_CYCLE_STF;
451: static int LineRemoveBottomCycle = LINE_REMOVE_BOTTOM_CYCLE_STF;
452: static int RestartVideoCounterCycle = RESTART_VIDEO_COUNTER_CYCLE_STF;
453: static int VblVideoCycleOffset = VBL_VIDEO_CYCLE_OFFSET_STF;
1.1.1.13 root 454:
455: int LineTimerBCycle = LINE_END_CYCLE_50 + TIMERB_VIDEO_CYCLE_OFFSET; /* position of the Timer B interrupt on active lines */
1.1.1.15 root 456: int TimerBEventCountCycleStart = -1; /* value of Cycles_GetCounterOnWriteAccess last time timer B was started for the current VBL */
1.1 root 457:
1.1.1.20 root 458: int HblJitterIndex = 0;
459: const int HblJitterArray[] = {
460: 8,4,4,0,0 /* measured on STF */
461: };
462: const int HblJitterArrayPending[] = {
463: 4,4,4,4,4 // { 8,8,12,8,12 }; /* measured on STF, not always accurate */
464: };
465: int VblJitterIndex = 0;
466: const int VblJitterArray[] = {
467: 8,0,4,0,4 /* measured on STF */
468: };
469: const int VblJitterArrayPending[] = {
470: 8,8,12,8,12 /* not verified on STF, use the same as HBL */
471: };
1.1.1.14 root 472:
1.1.1.18 root 473: int BlankLines = 0; /* Number of empty line with no signal (by switching hi/lo near cycles 500) */
1.1.1.12 root 474:
1.1.1.15 root 475:
476: typedef struct
477: {
478: int VBL; /* VBL for this Pos (or -1 if Pos not defined for now) */
479: int FrameCycles; /* Number of cycles since this VBL */
480: int HBL; /* HBL in the VBL */
481: int LineCycles; /* cycles in the HBL */
482: } SHIFTER_POS;
483:
484:
485: typedef struct
486: {
487: int StartCycle; /* first cycle of this line, as returned by Cycles_GetCounter */
488:
489: Uint32 BorderMask; /* borders' states for this line */
490: int DisplayPixelShift; /* number of pixels to shift the whole line (<0 shift to the left, >0 shift to the right) */
491: /* On STF, this is obtained when switching hi/med for a variable number of cycles, */
492: /* but just removing left border will shift the line too. */
493:
494: int DisplayStartCycle; /* cycle where display starts for this line (0-512) : 0, 52 or 56 */
495: int DisplayEndCycle; /* cycle where display ends for this line (0-512) : 0, 160, 372, 376, 460 or 512 */
496: int DisplayBytes; /* how many bytes to display for this line */
497:
498: } SHIFTER_LINE;
499:
500:
501: typedef struct
502: {
503: int HBL_CyclePos; /* cycle position for the HBL int (depends on freq/res) */
504: int TimerB_CyclePos; /* cycle position for the Timer B int (depends on freq/res) */
505:
506: int Freq; /* value of ff820a & 2, or -1 if not set */
507: int Res; /* value of ff8260 & 3, or -1 if not set */
508: SHIFTER_POS FreqPos50; /* position of latest freq change to 50 Hz*/
509: SHIFTER_POS FreqPos60; /* position of latest freq change to 60 Hz*/
510: SHIFTER_POS ResPosLo; /* position of latest change to low res */
511: SHIFTER_POS ResPosMed; /* position of latest change to med res */
512: SHIFTER_POS ResPosHi; /* position of latest change to high res */
513:
514: SHIFTER_POS Scroll8264Pos; /* position of latest write to $ff8264 */
515: SHIFTER_POS Scroll8265Pos; /* position of latest write to $ff8265 */
516:
517: SHIFTER_LINE ShifterLines[ MAX_SCANLINES_PER_FRAME ];
518: } SHIFTER_FRAME;
519:
520:
521: SHIFTER_FRAME ShifterFrame;
522:
523:
524:
525: /*--------------------------------------------------------------*/
526: /* Local functions prototypes */
527: /*--------------------------------------------------------------*/
528:
529: static void Video_SetSystemTimings ( void );
530:
531: static Uint32 Video_CalculateAddress ( void );
1.1.1.16 root 532: static int Video_GetMMUStartCycle ( int DisplayStartCycle );
1.1.1.15 root 533: static void Video_WriteToShifter ( Uint8 Res );
534: static void Video_Sync_SetDefaultStartEnd ( Uint8 Freq , int HblCounterVideo , int LineCycles );
535:
536: static int Video_HBL_GetPos ( void );
1.1.1.18 root 537: static int Video_TimerB_GetDefaultPos ( void );
1.1.1.15 root 538: static void Video_EndHBL ( void );
539: static void Video_StartHBL ( void );
540:
541: static void Video_StoreFirstLinePalette(void);
542: static void Video_StoreResolution(int y);
543: static void Video_CopyScreenLineMono(void);
544: static void Video_CopyScreenLineColor(void);
545: static void Video_CopyVDIScreen(void);
546: static void Video_SetHBLPaletteMaskPointers(void);
547:
548: static void Video_UpdateTTPalette(int bpp);
549: static void Video_DrawScreen(void);
550:
551: static void Video_ResetShifterTimings(void);
552: static void Video_InitShifterLines(void);
553: static void Video_ClearOnVBL(void);
554:
555: static void Video_AddInterrupt ( int Pos , interrupt_id Handler );
556: static void Video_AddInterruptHBL ( int Pos );
557:
1.1.1.22! root 558: static void Video_ColorReg_WriteWord(void);
! 559: static void Video_ColorReg_ReadWord(void);
1.1.1.15 root 560:
561:
1.1 root 562: /*-----------------------------------------------------------------------*/
1.1.1.11 root 563: /**
564: * Save/Restore snapshot of local variables('MemorySnapShot_Store' handles type)
565: */
1.1.1.13 root 566: void Video_MemorySnapShot_Capture(bool bSave)
1.1 root 567: {
1.1.1.11 root 568: /* Save/Restore details */
569: MemorySnapShot_Store(&TTRes, sizeof(TTRes));
570: MemorySnapShot_Store(&bUseHighRes, sizeof(bUseHighRes));
571: MemorySnapShot_Store(&nVBLs, sizeof(nVBLs));
572: MemorySnapShot_Store(&nHBL, sizeof(nHBL));
573: MemorySnapShot_Store(&nStartHBL, sizeof(nStartHBL));
574: MemorySnapShot_Store(&nEndHBL, sizeof(nEndHBL));
575: MemorySnapShot_Store(&OverscanMode, sizeof(OverscanMode));
576: MemorySnapShot_Store(HBLPalettes, sizeof(HBLPalettes));
577: MemorySnapShot_Store(HBLPaletteMasks, sizeof(HBLPaletteMasks));
578: MemorySnapShot_Store(&VideoBase, sizeof(VideoBase));
579: MemorySnapShot_Store(&LineWidth, sizeof(LineWidth));
580: MemorySnapShot_Store(&HWScrollCount, sizeof(HWScrollCount));
581: MemorySnapShot_Store(&pVideoRaster, sizeof(pVideoRaster));
582: MemorySnapShot_Store(&nScanlinesPerFrame, sizeof(nScanlinesPerFrame));
583: MemorySnapShot_Store(&nCyclesPerLine, sizeof(nCyclesPerLine));
584: MemorySnapShot_Store(&nFirstVisibleHbl, sizeof(nFirstVisibleHbl));
585: MemorySnapShot_Store(&bSteBorderFlag, sizeof(bSteBorderFlag));
1.1.1.14 root 586: MemorySnapShot_Store(&HblJitterIndex, sizeof(HblJitterIndex));
587: MemorySnapShot_Store(&VblJitterIndex, sizeof(VblJitterIndex));
1.1.1.15 root 588: MemorySnapShot_Store(&ShifterFrame, sizeof(ShifterFrame));
1.1.1.21 root 589: MemorySnapShot_Store(&bTTSampleHold, sizeof(bTTSampleHold));
590: MemorySnapShot_Store(&bTTHypermono, sizeof(bTTHypermono));
591: MemorySnapShot_Store(&TTSpecialVideoMode, sizeof(TTSpecialVideoMode));
1.1.1.15 root 592: }
593:
594:
595: /*-----------------------------------------------------------------------*/
596: /**
597: * Reset video chip
598: */
599: void Video_Reset(void)
600: {
601: /* NOTE! Must reset all of these register type things here!!!! */
1.1.1.19 root 602: Video_Reset_Glue();
1.1.1.15 root 603:
604: /* Set system specific timings */
605: Video_SetSystemTimings();
606:
607: /* Reset VBL counter */
608: nVBLs = 0;
609: /* Reset addresses */
610: VideoBase = 0L;
611:
612: /* Reset shifter's state variables */
613: ShifterFrame.Freq = -1;
614: ShifterFrame.Res = -1;
615: ShifterFrame.FreqPos50.VBL = -1;
616: ShifterFrame.FreqPos60.VBL = -1;
617: ShifterFrame.ResPosLo.VBL = -1;
618: ShifterFrame.ResPosMed.VBL = -1;
619: ShifterFrame.ResPosHi.VBL = -1;
620: ShifterFrame.Scroll8264Pos.VBL = -1;
621: ShifterFrame.Scroll8265Pos.VBL = -1;
622:
623: Video_InitShifterLines ();
624:
625: /* Reset STE screen variables */
626: LineWidth = 0;
627: HWScrollCount = 0;
628: bSteBorderFlag = false;
629:
630: NewLineWidth = -1; /* cancel pending modifications set before the reset */
631: NewHWScrollCount = -1;
632:
1.1.1.16 root 633: VideoCounterDelayedOffset = 0;
634: pVideoRasterDelayed = NULL;
635:
1.1.1.15 root 636: /* Reset jitter indexes */
637: HblJitterIndex = 0;
638: VblJitterIndex = 0;
639:
640: /* Clear framecycles counter */
641: Cycles_SetCounter(CYCLES_COUNTER_VIDEO, 0);
642:
643: /* Clear ready for new VBL */
644: Video_ClearOnVBL();
645: }
646:
647:
648: /*-----------------------------------------------------------------------*/
649: /**
650: * Reset the GLUE chip responsible for generating the H/V sync signals.
651: * When the 68000 RESET instruction is called, frequency and resolution
652: * should be reset to 0.
653: */
654: void Video_Reset_Glue(void)
655: {
1.1.1.20 root 656: Uint8 VideoShifterByte;
657:
1.1.1.19 root 658: IoMem_WriteByte(0xff820a,0); /* Video frequency */
659:
660: /* Are we in high-res? */
661: if (bUseHighRes)
662: VideoShifterByte = ST_HIGH_RES; /* Mono monitor */
663: else
664: VideoShifterByte = ST_LOW_RES;
665: if (bUseVDIRes)
666: VideoShifterByte = VDIRes;
667:
668: IoMem_WriteByte(0xff8260, VideoShifterByte);
1.1 root 669: }
670:
1.1.1.8 root 671:
1.1 root 672: /*-----------------------------------------------------------------------*/
1.1.1.12 root 673: /*
674: * Set specific video timings, depending on the system being emulated.
675: */
1.1.1.15 root 676: static void Video_SetSystemTimings(void)
1.1.1.12 root 677: {
1.1.1.19 root 678: if ( ConfigureParams.System.nMachineType == MACHINE_ST )
679: {
680: LineRemoveTopCycle = LINE_REMOVE_TOP_CYCLE_STF;
681: LineRemoveBottomCycle = LINE_REMOVE_BOTTOM_CYCLE_STF;
682: RestartVideoCounterCycle = RESTART_VIDEO_COUNTER_CYCLE_STF;
683: VblVideoCycleOffset = VBL_VIDEO_CYCLE_OFFSET_STF;
684: }
1.1.1.20 root 685: else /* STE, TT */
1.1.1.19 root 686: {
687: LineRemoveTopCycle = LINE_REMOVE_TOP_CYCLE_STE;
688: LineRemoveBottomCycle = LINE_REMOVE_BOTTOM_CYCLE_STE;
689: RestartVideoCounterCycle = RESTART_VIDEO_COUNTER_CYCLE_STE;
690: VblVideoCycleOffset = VBL_VIDEO_CYCLE_OFFSET_STE;
691: }
1.1.1.12 root 692: }
693:
694:
695: /*-----------------------------------------------------------------------*/
1.1.1.11 root 696: /**
1.1.1.15 root 697: * Convert the elapsed number of cycles since the start of the VBL
698: * into the corresponding HBL number and the cycle position in the current
699: * HBL. We use the starting cycle position of the closest HBL to compute
700: * the cycle position on the line (this allows to mix lines with different
701: * values for nCyclesPerLine).
702: * We can have 2 cases on the limit where the real video line count can be
703: * different from nHBL :
704: * - when reading video address between cycle 0 and 12, LineCycle will be <0,
705: * so we need to use the data from line nHBL-1
706: * - if LineCycle >= nCyclesPerLine, this means the HBL int was not processed
707: * yet, so the video line number is in fact nHBL+1
708: */
709:
710: void Video_ConvertPosition ( int FrameCycles , int *pHBL , int *pLineCycles )
711: {
1.1.1.16 root 712: if ( 0 && FrameCycles >= CyclesPerVBL ) /* rare case between end of last hbl and start of next VBL (during 64 cycles) */
1.1.1.15 root 713: {
1.1.1.16 root 714: *pHBL = ( FrameCycles - CyclesPerVBL ) / nCyclesPerLine;
715: *pLineCycles = ( FrameCycles - CyclesPerVBL ) % nCyclesPerLine;
716: //fprintf ( stderr , "out of vbl FrameCycles %d CyclesPerVBL %d nHBL=%d %d %d\n" , FrameCycles , CyclesPerVBL, nHBL , *pHBL , *pLineCycles );
1.1.1.15 root 717: }
1.1.1.16 root 718:
719: else /* most common case */
1.1.1.15 root 720: {
1.1.1.16 root 721: *pHBL = nHBL;
722: *pLineCycles = FrameCycles - ShifterFrame.ShifterLines[ nHBL ].StartCycle;
1.1.1.15 root 723:
1.1.1.16 root 724: if ( *pLineCycles < 0 ) /* reading from the previous video line */
725: {
726: *pHBL = nHBL-1;
727: *pLineCycles = FrameCycles - ShifterFrame.ShifterLines[ nHBL-1 ].StartCycle;
728: }
729:
730: else if ( *pLineCycles >= nCyclesPerLine ) /* reading on the next line, but HBL int was delayed */
731: {
732: *pHBL = nHBL+1;
733: *pLineCycles -= nCyclesPerLine;
734: }
735: }
1.1.1.15 root 736:
737: if ( *pLineCycles < 0 )
738: fprintf ( stderr , "bug nHBL=%d %d %d\n" , nHBL , *pHBL , *pLineCycles );
739:
740: //if ( ( *pHBL != FrameCycles / nCyclesPerLine ) || ( *pLineCycles != FrameCycles % nCyclesPerLine ) )
741: // LOG_TRACE ( TRACE_VIDEO_ADDR , "conv pos %d %d - %d %d\n" , *pHBL , FrameCycles / nCyclesPerLine , *pLineCycles , FrameCycles % nCyclesPerLine );
742: // LOG_TRACE ( TRACE_VIDEO_ADDR , "conv pos %d %d %d\n" , FrameCycles , *pHBL , *pLineCycles );
743: }
744:
745:
746: void Video_GetPosition ( int *pFrameCycles , int *pHBL , int *pLineCycles )
747: {
748: *pFrameCycles = Cycles_GetCounter(CYCLES_COUNTER_VIDEO);
749: Video_ConvertPosition ( *pFrameCycles , pHBL , pLineCycles );
750: }
751:
752:
753: void Video_GetPosition_OnWriteAccess ( int *pFrameCycles , int *pHBL , int *pLineCycles )
754: {
755: *pFrameCycles = Cycles_GetCounterOnWriteAccess(CYCLES_COUNTER_VIDEO);
756: Video_ConvertPosition ( *pFrameCycles , pHBL , pLineCycles );
757: }
758:
759:
760: void Video_GetPosition_OnReadAccess ( int *pFrameCycles , int *pHBL , int *pLineCycles )
761: {
762: *pFrameCycles = Cycles_GetCounterOnReadAccess(CYCLES_COUNTER_VIDEO);
763: Video_ConvertPosition ( *pFrameCycles , pHBL , pLineCycles );
764: }
765:
766:
767: /*-----------------------------------------------------------------------*/
768: /**
1.1.1.11 root 769: * Calculate and return video address pointer.
770: */
1.1.1.15 root 771: static Uint32 Video_CalculateAddress ( void )
1.1 root 772: {
1.1.1.15 root 773: int FrameCycles, HblCounterVideo, LineCycles;
774: int X, NbBytes;
1.1.1.11 root 775: Uint32 VideoAddress; /* Address of video display in ST screen space */
776: int nSyncByte;
777: int LineBorderMask;
778: int PrevSize;
779: int CurSize;
1.1.1.15 root 780: int LineStartCycle , LineEndCycle;
1.1.1.11 root 781:
782: /* Find number of cycles passed during frame */
1.1.1.21 root 783: /* We need to subtract '12' for correct video address calculation */
1.1.1.15 root 784: FrameCycles = Cycles_GetCounterOnReadAccess(CYCLES_COUNTER_VIDEO) - 12;
1.1.1.11 root 785:
786: /* Now find which pixel we are on (ignore left/right borders) */
1.1.1.15 root 787: Video_ConvertPosition ( FrameCycles , &HblCounterVideo , &LineCycles );
788: X = LineCycles;
1.1.1.11 root 789:
790: nSyncByte = IoMem_ReadByte(0xff820a) & 2; /* only keep bit 1 */
791: if (nSyncByte) /* 50 Hz */
792: {
793: LineStartCycle = LINE_START_CYCLE_50;
794: LineEndCycle = LINE_END_CYCLE_50;
795: }
796: else /* 60 Hz */
797: {
798: LineStartCycle = LINE_START_CYCLE_60;
799: LineEndCycle = LINE_END_CYCLE_60;
800: }
801:
802:
803: /* Top of screen is usually 63 lines from VBL in 50 Hz */
1.1.1.15 root 804: if ( HblCounterVideo < nStartHBL )
1.1.1.11 root 805: {
806: /* pVideoRaster was set during Video_ClearOnVBL using VideoBase */
807: /* and it could also have been modified on STE by writing to ff8205/07/09 */
1.1.1.15 root 808: /* So, we should not use ff8201/ff8203 which are reloaded in ff8205/ff8207 only once per VBL */
809: /* but use pVideoRaster - STRam instead to get current shifter video address */
1.1.1.11 root 810: VideoAddress = pVideoRaster - STRam;
811: }
812:
1.1.1.15 root 813: else if (FrameCycles > RestartVideoCounterCycle)
1.1.1.11 root 814: {
815: /* This is where ff8205/ff8207 are reloaded with the content of ff8201/ff8203 on a real ST */
816: /* (used in ULM DSOTS demos). VideoBase is also reloaded in Video_ClearOnVBL to be sure */
817: VideoBase = (Uint32)IoMem_ReadByte(0xff8201)<<16 | (Uint32)IoMem_ReadByte(0xff8203)<<8;
818: if (ConfigureParams.System.nMachineType != MACHINE_ST)
819: {
1.1.1.20 root 820: /* on STe 2 aligned, on TT 8 aligned. We do STe. */
1.1.1.11 root 821: VideoBase |= IoMem_ReadByte(0xff820d) & ~1;
822: }
823:
824: VideoAddress = VideoBase;
825: }
826:
827: else
828: {
829: VideoAddress = pVideoRaster - STRam; /* pVideoRaster is updated by Video_CopyScreenLineColor */
830:
831: /* Now find which pixel we are on (ignore left/right borders) */
1.1.1.15 root 832: // X = ( Cycles_GetCounterOnReadAccess(CYCLES_COUNTER_VIDEO) - 12 ) % nCyclesPerLine;
1.1.1.11 root 833:
834: /* Get real video line count (can be different from nHBL) */
1.1.1.15 root 835: // HblCounterVideo = ( Cycles_GetCounterOnReadAccess(CYCLES_COUNTER_VIDEO) - 12 ) / nCyclesPerLine;
1.1.1.11 root 836:
837: /* Correct the case when read overlaps end of line / start of next line */
838: /* Video_CopyScreenLineColor was not called yet to update VideoAddress */
839: /* so we need to determine the size of the previous line to get the */
840: /* correct value of VideoAddress. */
841: PrevSize = 0;
842: if ( HblCounterVideo < nHBL )
843: X = 0;
844: else if ( ( HblCounterVideo > nHBL ) /* HblCounterVideo = nHBL+1 */
845: && ( nHBL >= nStartHBL ) ) /* if nHBL was not visible, PrevSize = 0 */
846: {
1.1.1.15 root 847: LineBorderMask = ShifterFrame.ShifterLines[ HblCounterVideo-1 ].BorderMask; /* get border mask for nHBL */
1.1.1.11 root 848: PrevSize = BORDERBYTES_NORMAL; /* normal line */
849:
850: if (LineBorderMask & BORDERMASK_LEFT_OFF)
851: PrevSize += BORDERBYTES_LEFT;
852: else if (LineBorderMask & BORDERMASK_LEFT_PLUS_2)
853: PrevSize += 2;
854:
855: if (LineBorderMask & BORDERMASK_STOP_MIDDLE)
856: PrevSize -= 106;
857: else if (LineBorderMask & BORDERMASK_RIGHT_MINUS_2)
858: PrevSize -= 2;
859: else if (LineBorderMask & BORDERMASK_RIGHT_OFF)
860: PrevSize += BORDERBYTES_RIGHT;
861:
862: if (LineBorderMask & BORDERMASK_EMPTY_LINE)
863: PrevSize = 0;
864: }
865:
866:
1.1.1.15 root 867: LineBorderMask = ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask;
1.1.1.11 root 868:
869: CurSize = BORDERBYTES_NORMAL; /* normal line */
870:
871: if (LineBorderMask & BORDERMASK_LEFT_OFF)
872: CurSize += BORDERBYTES_LEFT;
873: else if (LineBorderMask & BORDERMASK_LEFT_PLUS_2)
874: CurSize += 2;
1.1.1.16 root 875: else if (bSteBorderFlag) /* bigger line by 8 bytes on the left (STE specific) */
876: CurSize += 8;
877: else if ( ( HWScrollCount > 0 ) && ( HWScrollPrefetch == 1 ) )
878: CurSize += 8; /* 8 more bytes are loaded when scrolling with prefetching */
1.1.1.11 root 879:
880: if (LineBorderMask & BORDERMASK_STOP_MIDDLE)
881: CurSize -= 106;
882: else if (LineBorderMask & BORDERMASK_RIGHT_MINUS_2)
883: CurSize -= 2;
884: else if (LineBorderMask & BORDERMASK_RIGHT_OFF)
885: CurSize += BORDERBYTES_RIGHT;
886: if (LineBorderMask & BORDERMASK_RIGHT_OFF_FULL)
887: CurSize += BORDERBYTES_RIGHT_FULL;
888:
889: if ( LineBorderMask & BORDERMASK_LEFT_PLUS_2)
890: LineStartCycle = LINE_START_CYCLE_60;
891: else if ( LineBorderMask & BORDERMASK_LEFT_OFF )
1.1.1.15 root 892: LineStartCycle = LINE_START_CYCLE_71;
1.1.1.16 root 893: else if ( bSteBorderFlag )
894: LineStartCycle -= 16; /* display starts 16 pixels earlier */
895: else if ( ( HWScrollCount > 0 ) && ( HWScrollPrefetch == 1 ) )
896: LineStartCycle -= 16; /* shifter starts reading 16 pixels earlier when scrolling with prefetching */
1.1.1.11 root 897:
898: LineEndCycle = LineStartCycle + CurSize*2;
899:
900:
901: if ( X < LineStartCycle )
1.1.1.16 root 902: X = LineStartCycle; /* display is disabled in the left border */
1.1.1.11 root 903: else if ( X > LineEndCycle )
1.1.1.16 root 904: {
905: X = LineEndCycle; /* display is disabled in the right border */
906: /* On STE, the Shifter skips the given amount of words as soon as display is disabled */
907: /* (LineWidth is 0 on STF */
908: VideoAddress += LineWidth*2;
909: }
1.1.1.11 root 910:
911: NbBytes = ( (X-LineStartCycle)>>1 ) & (~1); /* 2 cycles per byte */
912:
913:
914: /* when left border is open, we have 2 bytes less than theorical value */
915: /* (26 bytes in left border, which is not a multiple of 4 cycles) */
916: if ( LineBorderMask & BORDERMASK_LEFT_OFF )
917: NbBytes -= 2;
918:
919: if ( LineBorderMask & BORDERMASK_EMPTY_LINE )
920: NbBytes = 0;
921:
1.1.1.16 root 922: /* Add line cycles if we have not reached end of screen yet */
1.1.1.18 root 923: if ( HblCounterVideo < nEndHBL + BlankLines )
1.1.1.11 root 924: VideoAddress += PrevSize + NbBytes;
925: }
926:
1.1.1.16 root 927: LOG_TRACE(TRACE_VIDEO_ADDR , "video base=%x raster=%x addr=%x video_cyc=%d "
928: "line_cyc=%d/X=%d @ nHBL=%d/video_hbl=%d %d<->%d pc=%x instr_cyc=%d\n",
929: VideoBase, (int)(pVideoRaster - STRam), VideoAddress,
930: Cycles_GetCounter(CYCLES_COUNTER_VIDEO), LineCycles, X, nHBL,
931: HblCounterVideo, LineStartCycle, LineEndCycle, M68000_GetPC(), CurrentInstrCycles);
1.1.1.11 root 932:
933: return VideoAddress;
934: }
935:
936:
937: /*-----------------------------------------------------------------------*/
938: /**
1.1.1.16 root 939: * Calculate the cycle where the STF/STE's MMU starts reading
940: * data to send them to the shifter.
941: * On STE, if hscroll is used, prefetch will cause this position to
942: * happen 16 cycles earlier.
943: * This function should use the same logic as in Video_CalculateAddress.
944: * NOTE : this function is not completly accurate, as even when there's
945: * no hscroll (on STF) the mmu starts reading 16 cycles before display starts.
946: * But it's good enough to emulate writing to ff8205/07/09 on STE.
947: */
948: static int Video_GetMMUStartCycle ( int DisplayStartCycle )
949: {
950: if ( bSteBorderFlag )
951: DisplayStartCycle -= 16; /* display starts 16 pixels earlier */
952: else if ( ( HWScrollCount > 0 ) && ( HWScrollPrefetch == 1 ) )
953: DisplayStartCycle -= 16; /* shifter starts reading 16 pixels earlier when scrolling with prefetching */
954:
955: return DisplayStartCycle;
956: }
957:
958:
959: /*-----------------------------------------------------------------------*/
960: /**
1.1.1.11 root 961: * Write to VideoShifter (0xff8260), resolution bits
962: */
1.1.1.15 root 963: static void Video_WriteToShifter ( Uint8 Res )
1.1 root 964: {
1.1.1.15 root 965: int FrameCycles, HblCounterVideo, LineCycles;
1.1.1.11 root 966:
1.1.1.15 root 967: Video_GetPosition_OnWriteAccess ( &FrameCycles , &HblCounterVideo , &LineCycles );
1.1.1.11 root 968:
1.1.1.15 root 969: LOG_TRACE(TRACE_VIDEO_RES ,"shifter=0x%2.2X video_cyc_w=%d line_cyc_w=%d @ nHBL=%d/video_hbl_w=%d pc=%x instr_cyc=%d\n",
970: Res, FrameCycles, LineCycles, nHBL, HblCounterVideo, M68000_GetPC(), CurrentInstrCycles );
1.1.1.11 root 971:
972:
1.1.1.13 root 973: /* Ignore consecutive writes of the same value */
1.1.1.15 root 974: if ( Res == ShifterFrame.Res )
1.1.1.13 root 975: return; /* do nothing */
976:
1.1.1.15 root 977:
978: if ( Res == 0x02 ) /* switch to high res */
979: {
980: if ( LineCycles < ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle ) /* start could be 0,52,56 */
981: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle = LINE_START_CYCLE_71;
982:
983: if ( ( LineCycles < ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle ) /* end could be 160,372,376,460 */
984: && ( LineCycles < LINE_END_CYCLE_71 ) )
985: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle = LINE_END_CYCLE_71;
986: }
987: else /* switch to lo/med res */
988: {
989: /* In lo/med res, display start/end depends on the freq register in $ff820a */
990: Video_Sync_SetDefaultStartEnd ( IoMem[0xff820a] & 2 , HblCounterVideo , LineCycles );
991: }
992:
993:
1.1.1.11 root 994: /* Remove left border : +26 bytes */
1.1.1.15 root 995: /* This can be done with a hi/lo res switch or a hi/med res switch */
996: if ( ( ShifterFrame.Res == 0x02 ) && ( Res == 0x00 ) /* switched from hi res to lo res */
1.1.1.16 root 997: // && ( LineCycles >= 12 ) /* switch back to low res should be after cycle 8 */
1.1.1.19 root 998: && ( ( ShifterFrame.ResPosHi.LineCycles < 12 ) || ( ShifterFrame.ResPosHi.LineCycles >= 504 ) ) /* switch to hi between 504 and 8 */
1.1.1.15 root 999: && ( LineCycles <= (LINE_START_CYCLE_71+28) )
1.1.1.17 root 1000: && ( FrameCycles - ShifterFrame.ResPosHi.FrameCycles <= 32 ) )
1.1.1.15 root 1001: {
1.1.1.20 root 1002: if ( ( ( ConfigureParams.System.nMachineType == MACHINE_STE ) /* special case for 504/4 and 508/4 on STE -> add 20 bytes to left border */
1.1.1.17 root 1003: || ( ConfigureParams.System.nMachineType == MACHINE_MEGA_STE ) )
1.1.1.20 root 1004: && ( ( ( ShifterFrame.ResPosHi.LineCycles == 504 ) && ( LineCycles == 4 ) )
1005: || ( ( ShifterFrame.ResPosHi.LineCycles == 508 ) && ( LineCycles == 4 ) ) ) )
1.1.1.16 root 1006: {
1007: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_LEFT_OFF_2_STE;
1008: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle = LINE_START_CYCLE_71+16; /* starts 16 pixels later */
1.1.1.17 root 1009: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayPixelShift = -8; /* screen is shifted 8 pixels to the left */
1.1.1.16 root 1010: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect remove left 2 ste %d<->%d\n" ,
1011: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
1012: }
1013: else /* other case for STF/STE -> add 26 bytes */
1014: {
1015: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_LEFT_OFF;
1016: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle = LINE_START_CYCLE_71;
1017: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayPixelShift = -4; /* screen is shifted 4 pixels to the left */
1018: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect remove left %d<->%d\n" ,
1019: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
1020: }
1.1.1.15 root 1021: }
1022:
1023: if ( ( ShifterFrame.Res == 0x02 ) && ( Res == 0x01 ) /* switched from hi res to med res */
1024: && ( LineCycles <= (LINE_START_CYCLE_71+20) )
1025: && ( FrameCycles - ShifterFrame.ResPosHi.FrameCycles <= 30 ) )
1026: {
1027: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_LEFT_OFF_MED; /* a later switch to low res might gives right scrolling */
1028: /* By default, this line will be in med res, except if we detect hardware scrolling later */
1029: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_OVERSCAN_MED_RES | ( 2 << 20 );
1030: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle = LINE_START_CYCLE_71;
1031: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect remove left med %d<->%d\n" ,
1032: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
1033: }
1034:
1035: /* Empty line switching res on STF : switch to hi res on cycle 28, then go back to med/lo res */
1036: /* This creates a 0 byte line, the video counter won't change for this line */
1037: else if ( ( ShifterFrame.Res == 0x02 ) /* switched from hi res */
1038: && ( FrameCycles - ShifterFrame.ResPosHi.FrameCycles <= 16 )
1039: && ( ShifterFrame.ResPosHi.LineCycles == LINE_EMPTY_CYCLE_71_STF )
1040: && ( ConfigureParams.System.nMachineType == MACHINE_ST ) )
1041: {
1042: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_EMPTY_LINE;
1043: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle = 0;
1044: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle = 0;
1045: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect empty line res %d<->%d\n" ,
1046: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
1047: }
1048:
1049: /* Empty line switching res on STE (switch is 4 cycles later than on STF) */
1050: else if ( ( ShifterFrame.Res == 0x02 ) /* switched from hi res */
1051: && ( FrameCycles - ShifterFrame.ResPosHi.FrameCycles <= 16 )
1052: && ( ShifterFrame.ResPosHi.LineCycles == LINE_EMPTY_CYCLE_71_STE )
1.1.1.17 root 1053: && ( ( ConfigureParams.System.nMachineType == MACHINE_STE )
1054: || ( ConfigureParams.System.nMachineType == MACHINE_MEGA_STE ) ) )
1.1.1.15 root 1055: {
1056: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_EMPTY_LINE;
1057: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle = 0;
1058: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle = 0;
1059: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect empty line res %d<->%d\n" ,
1060: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
1061: }
1062:
1063: /* Empty line switching res on STF : switch to hi res just before the HBL then go back to lo/med res */
1.1.1.19 root 1064: /* Next HBL will be an empty line (used in 'No Buddies Land' and 'Delirious Demo IV / NGC') */
1.1.1.15 root 1065: else if ( ( ShifterFrame.Res == 0x02 ) /* switched from hi res */
1.1.1.18 root 1066: && ( ( ShifterFrame.ResPosHi.LineCycles == 500-4 ) || ( ShifterFrame.ResPosHi.LineCycles == 500 ) )
1.1.1.15 root 1067: && ( LineCycles == 508 ) )
1068: {
1.1.1.16 root 1069: ShifterFrame.ShifterLines[ HblCounterVideo+1 ].BorderMask |= BORDERMASK_EMPTY_LINE;
1070: ShifterFrame.ShifterLines[ HblCounterVideo+1 ].DisplayStartCycle = 0;
1071: ShifterFrame.ShifterLines[ HblCounterVideo+1 ].DisplayEndCycle = 0;
1.1.1.18 root 1072: BlankLines++; /* no video signal at all for this line */
1.1.1.16 root 1073: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect empty line res 2 %d<->%d for nHBL=%d\n" ,
1074: ShifterFrame.ShifterLines[ HblCounterVideo+1 ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo+1 ].DisplayEndCycle , nHBL+1 );
1.1.1.15 root 1075: }
1076:
1077: /* Start right border near middle of the line : -106 bytes */
1078: /* Switch to hi res just before the start of the right border in hi res, then go back to lo/mid res */
1079: if ( ( ShifterFrame.Res == 0x02 ) /* switched from hi res */
1080: && ( ShifterFrame.ResPosHi.HBL == HblCounterVideo ) /* switch during the same line */
1081: && ( ShifterFrame.ResPosHi.LineCycles <= LINE_END_CYCLE_71+4 ) /* switched to hi res before cycle 164 */
1082: && ( LineCycles >= LINE_END_CYCLE_71+4 ) ) /* switch to lo res after cycle 164 */
1083: {
1084: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_STOP_MIDDLE;
1085: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle = LINE_END_CYCLE_71;
1086: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect stop middle %d<->%d\n" ,
1087: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
1088: }
1089:
1090: /* Remove right border a second time after removing it a first time. Display will */
1091: /* stop at cycle 512 instead of 460. */
1092: /* This removes left border on next line too (used in 'Enchanted Lands') */
1.1.1.16 root 1093: /* If right border was not removed, then we will get an empty line for the next HBL (used in Beyond by Kruz) */
1094: if ( ( ShifterFrame.Res == 0x02 ) /* switched from hi res */
1095: && ( LineCycles > LINE_END_CYCLE_50_2 ) /* switch to low just after end of right border */
1096: && ( ShifterFrame.ResPosHi.LineCycles <= LINE_END_CYCLE_50_2 ) /* switch to hi just before end of right border */
1097: && ( FrameCycles - ShifterFrame.ResPosHi.FrameCycles <= 20 ) )
1098: {
1099: if ( ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask & BORDERMASK_RIGHT_OFF ) /* Enchanted Lands */
1100: {
1101: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_RIGHT_OFF_FULL;
1102: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle = LINE_END_CYCLE_FULL;
1103: ShifterFrame.ShifterLines[ HblCounterVideo+1 ].BorderMask |= BORDERMASK_LEFT_OFF; /* no left border on next line */
1104: ShifterFrame.ShifterLines[ HblCounterVideo+1 ].DisplayStartCycle = LINE_START_CYCLE_71;
1105: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect remove right full %d<->%d\n" ,
1106: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
1107: }
1108: else /* Pax Plax Parralax in Beyond by Kruz */
1109: {
1110: ShifterFrame.ShifterLines[ HblCounterVideo+1 ].BorderMask = BORDERMASK_EMPTY_LINE;
1111: ShifterFrame.ShifterLines[ HblCounterVideo+1 ].DisplayStartCycle = 0;
1112: ShifterFrame.ShifterLines[ HblCounterVideo+1 ].DisplayEndCycle = 0;
1113: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect empty line res 3 %d<->%d for nHBL=%d\n" ,
1114: ShifterFrame.ShifterLines[ HblCounterVideo+1 ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo+1 ].DisplayEndCycle , nHBL+1 );
1115: }
1.1.1.15 root 1116: }
1117:
1118: /* If left border is opened and we switch to medium resolution during the next cycles, */
1119: /* then we assume a med res overscan line instead of a low res overscan line. */
1120: /* Note that in that case, the switch to med res can shift the display by 0-3 words */
1.1.1.11 root 1121: /* Used in 'No Cooper' greetings by 1984 and 'Punish Your Machine' by Delta Force */
1.1.1.15 root 1122: if ( ( ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask & BORDERMASK_LEFT_OFF )
1123: && ( Res == 0x01 ) )
1.1.1.11 root 1124: {
1.1.1.18 root 1125: if ( ( LineCycles == LINE_LEFT_MED_CYCLE_1 ) /* 'No Cooper' timing */
1126: || ( LineCycles == LINE_LEFT_MED_CYCLE_1+16 ) ) /* 'No Cooper' timing while removing bottom border */
1.1.1.11 root 1127: {
1.1.1.15 root 1128: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect med res overscan offset 0 byte\n" );
1129: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_OVERSCAN_MED_RES | ( 0 << 20 );
1.1.1.11 root 1130: }
1.1.1.15 root 1131: else if ( LineCycles == LINE_LEFT_MED_CYCLE_2 ) /* 'Best Part Of The Creation / PYM' timing */
1.1.1.11 root 1132: {
1.1.1.15 root 1133: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect med res overscan offset 2 bytes\n" );
1134: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_OVERSCAN_MED_RES | ( 2 << 20 );
1.1.1.11 root 1135: }
1136: }
1137:
1.1.1.15 root 1138: /* If left border was opened with a hi/med res switch we need to check */
1139: /* if the switch to low res can trigger a right hardware scrolling. */
1140: /* We store the pixels count in DisplayPixelShift */
1141: if ( ( ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask & BORDERMASK_LEFT_OFF_MED )
1142: && ( Res == 0x00 ) && ( LineCycles <= LINE_SCROLL_1_CYCLE_50 ) )
1.1.1.11 root 1143: {
1.1.1.15 root 1144: /* The hi/med switch was a switch to do low res hardware scrolling, */
1145: /* so we must cancel the med res overscan bit. */
1146: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask &= (~BORDERMASK_OVERSCAN_MED_RES);
1.1.1.11 root 1147:
1.1.1.15 root 1148: if ( LineCycles == LINE_SCROLL_13_CYCLE_50 ) /* cycle 20 */
1.1.1.11 root 1149: {
1.1.1.15 root 1150: LOG_TRACE(TRACE_VIDEO_BORDER_H , "detect 13 pixels right scroll\n" );
1151: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayPixelShift = 13;
1.1.1.11 root 1152: }
1.1.1.15 root 1153: else if ( LineCycles == LINE_SCROLL_9_CYCLE_50 ) /* cycle 24 */
1.1.1.11 root 1154: {
1.1.1.15 root 1155: LOG_TRACE(TRACE_VIDEO_BORDER_H , "detect 9 pixels right scroll\n" );
1156: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayPixelShift = 9;
1.1.1.11 root 1157: }
1.1.1.15 root 1158: else if ( LineCycles == LINE_SCROLL_5_CYCLE_50 ) /* cycle 28 */
1.1.1.11 root 1159: {
1.1.1.15 root 1160: LOG_TRACE(TRACE_VIDEO_BORDER_H , "detect 5 pixels right scroll\n" );
1161: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayPixelShift = 5;
1.1.1.11 root 1162: }
1.1.1.15 root 1163: else if ( LineCycles == LINE_SCROLL_1_CYCLE_50 ) /* cycle 32 */
1.1.1.11 root 1164: {
1.1.1.15 root 1165: LOG_TRACE(TRACE_VIDEO_BORDER_H , "detect 1 pixel right scroll\n" );
1166: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayPixelShift = 1;
1.1.1.11 root 1167: }
1168: }
1169:
1.1.1.18 root 1170: #define SCROLL2_4PX
1171: #ifdef SCROLL2_4PX
1172: /* Left border was removed with a hi/lo switch, then a med res switch was made */
1173: /* Depending on the low res switch, the screen will be shifted as a low res overscan line */
1174: /* This is a different method than the one used by ST Connexion with only 3 res switches */
1175: /* (so we must cancel the med res overscan bit) */
1176: if ( ( ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask & BORDERMASK_OVERSCAN_MED_RES )
1177: && ( ( ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask & ( 0xf << 20 ) ) == 0 )
1178: && ( Res == 0x00 ) && ( LineCycles <= 40 ) )
1179: {
1180: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask &= (~BORDERMASK_OVERSCAN_MED_RES); /* cancel mid res */
1181:
1182: if ( LineCycles == 28 )
1183: {
1184: LOG_TRACE(TRACE_VIDEO_BORDER_H , "detect 13 pixels right scroll 2\n" );
1185: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayPixelShift = 13;
1186: }
1187: else if ( LineCycles == 32 )
1188: {
1189: LOG_TRACE(TRACE_VIDEO_BORDER_H , "detect 9 pixels right scroll 2\n" );
1190: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayPixelShift = 9;
1191: }
1192: else if ( LineCycles == 36 )
1193: {
1194: LOG_TRACE(TRACE_VIDEO_BORDER_H , "detect 5 pixels right scroll 2\n" );
1195: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayPixelShift = 5;
1196: }
1197: else if ( LineCycles == 40 )
1198: {
1199: LOG_TRACE(TRACE_VIDEO_BORDER_H , "detect 1 pixel right scroll 2\n" );
1200: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayPixelShift = 1;
1201: }
1202: }
1203: #endif
1204:
1.1.1.15 root 1205:
1206: /* Update HBL's position only if display has not reached pos LINE_START_CYCLE_50 */
1207: /* and HBL interrupt was already handled at the beginning of this line. */
1208: /* This also changes the number of cycles per line. */
1209: if ( ( LineCycles <= LINE_START_CYCLE_50 ) && ( HblCounterVideo == nHBL ) )
1210: {
1211: nCyclesPerLine = Video_HBL_GetPos();
1212: Video_AddInterruptHBL ( nCyclesPerLine );
1213: }
1214:
1215:
1216: /* Update Timer B's position */
1217: LineTimerBCycle = Video_TimerB_GetPos ( HblCounterVideo );
1218: Video_AddInterruptTimerB ( LineTimerBCycle );
1219:
1220:
1221: ShifterFrame.Res = Res;
1222: if ( Res == 0x02 ) /* high res */
1223: {
1224: ShifterFrame.ResPosHi.VBL = nVBLs;
1225: ShifterFrame.ResPosHi.FrameCycles = FrameCycles;
1226: ShifterFrame.ResPosHi.HBL = HblCounterVideo;
1227: ShifterFrame.ResPosHi.LineCycles = LineCycles;
1228: }
1229: else if ( Res == 0x01 ) /* med res */
1230: {
1231: ShifterFrame.ResPosMed.VBL = nVBLs;
1232: ShifterFrame.ResPosMed.FrameCycles = FrameCycles;
1233: ShifterFrame.ResPosMed.HBL = HblCounterVideo;
1234: ShifterFrame.ResPosMed.LineCycles = LineCycles;
1235: }
1236: else /* low res */
1237: {
1238: ShifterFrame.ResPosLo.VBL = nVBLs;
1239: ShifterFrame.ResPosLo.FrameCycles = FrameCycles;
1240: ShifterFrame.ResPosLo.HBL = HblCounterVideo;
1241: ShifterFrame.ResPosLo.LineCycles = LineCycles;
1242: }
1243: }
1244:
1245:
1246:
1247: /*-----------------------------------------------------------------------*/
1248: /**
1249: * Set some default values for DisplayStartCycle/DisplayEndCycle
1250: * when changing frequency in lo/med res (testing orders are important
1251: * because the line can already have some borders changed).
1252: * This is necessary as some freq changes can modify start/end
1253: * even if they're not made at the exact borders' positions.
1254: * These values will be modified later if some borders are changed.
1255: */
1256: static void Video_Sync_SetDefaultStartEnd ( Uint8 Freq , int HblCounterVideo , int LineCycles )
1257: {
1258: if ( Freq == 0x02 ) /* switch to 50 Hz */
1259: {
1260: if ( ( LineCycles <= ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle ) /* start could be 0,52,56 */
1261: && ( ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle == LINE_START_CYCLE_60 ) )
1262: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle = LINE_START_CYCLE_50;
1263:
1264: if ( ( LineCycles <= ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle ) /* end could be 160,372,376,460 */
1265: && ( ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle < LINE_END_CYCLE_50 ) )
1266: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle = LINE_END_CYCLE_50;
1267: }
1268:
1269: else /* switch to 60 Hz */
1270: {
1271: if ( LineCycles < ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle ) /* start could be 0,52,56 */
1272: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle = LINE_START_CYCLE_60;
1273:
1274: if ( ( LineCycles < ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle ) /* end could be 160,372,376,460 */
1275: && ( ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle <= LINE_END_CYCLE_50 ) )
1276: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle = LINE_END_CYCLE_60;
1277: }
1278:
1.1.1.21 root 1279: //fprintf ( stderr , "sync default pos %d %d %d\n", HblCounterVideo , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
1.1.1.11 root 1280: }
1281:
1282:
1283: /*-----------------------------------------------------------------------*/
1284: /**
1285: * Write to VideoSync (0xff820a), Hz setting
1286: */
1.1.1.15 root 1287: void Video_Sync_WriteByte ( void )
1.1 root 1288: {
1.1.1.15 root 1289: int FrameCycles, HblCounterVideo, LineCycles;
1290: Uint8 Freq;
1.1.1.11 root 1291:
1292:
1.1.1.15 root 1293: if ( bUseVDIRes )
1294: return; /* no 50/60 Hz freq in VDI mode */
1.1.1.11 root 1295:
1296:
1.1.1.15 root 1297: /* We're only interested in bit 1 (50/60Hz) */
1298: Freq = IoMem[0xff820a] & 2;
1.1.1.11 root 1299:
1.1.1.15 root 1300: Video_GetPosition_OnWriteAccess ( &FrameCycles , &HblCounterVideo , &LineCycles );
1301:
1302: LOG_TRACE(TRACE_VIDEO_SYNC ,"sync=0x%2.2X video_cyc_w=%d line_cyc_w=%d @ nHBL=%d/video_hbl_w=%d pc=%x instr_cyc=%d\n",
1303: Freq, FrameCycles, LineCycles, nHBL, HblCounterVideo, M68000_GetPC(), CurrentInstrCycles );
1.1.1.11 root 1304:
1.1.1.13 root 1305: /* Ignore consecutive writes of the same value */
1.1.1.15 root 1306: if ( Freq == ShifterFrame.Freq )
1.1.1.13 root 1307: return; /* do nothing */
1308:
1.1.1.15 root 1309: /* Ignore freq changes if we are in high res */
1310: /* 2009/04/26 : don't ignore for now (see ST Cnx in Punish Your Machine) */
1311: // if ( ShifterFrame.Res == 0x02 )
1312: // return; /* do nothing */
1313:
1314: /* Set some default values for DisplayStartCycle/DisplayEndCycle before checking for border removal */
1315: Video_Sync_SetDefaultStartEnd ( Freq , HblCounterVideo , LineCycles );
1316:
1317:
1318: if ( ( ShifterFrame.Freq == 0x00 ) && ( Freq == 0x02 ) /* switched from 60 Hz to 50 Hz ? */
1319: // && ( ShifterFrame.FreqPos60.VBL == nVBLs ) /* switched during the same VBL */
1320: && ( HblCounterVideo >= nStartHBL ) /* only if display is on */
1.1.1.18 root 1321: && ( HblCounterVideo < nEndHBL + BlankLines ) ) /* only if display is on */
1.1.1.15 root 1322: {
1.1.1.18 root 1323: /* Blank line switching freq on STF : switch to 60 Hz on cycle 28, then go back to 50 Hz on cycle 36 */
1324: /* This creates a blank line where no signal is displayed, but the video counter will still change for this line */
1325: /* This blank line can be combined with left/right border changes */
1326: if ( ( FrameCycles - ShifterFrame.FreqPos60.FrameCycles <= 16 )
1327: && ( ShifterFrame.FreqPos60.LineCycles == LINE_EMPTY_CYCLE_71_STF )
1328: && ( ConfigureParams.System.nMachineType == MACHINE_ST ) )
1329: {
1330: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_BLANK_LINE;
1.1.1.22! root 1331: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect blank line freq stf\n" );
1.1.1.18 root 1332: }
1333:
1.1.1.15 root 1334: /* Add 2 bytes to left border : switch to 60 Hz before LINE_START_CYCLE_60 to force an early start */
1335: /* of the DE signal, then go back to 50 Hz. Note that depending on where the 50 Hz switch is made */
1336: /* the HBL signal will be at position 508 (60 Hz line) or 512 (50 Hz line) */
1.1.1.22! root 1337: /* Obtaining a +2 line with 512 cycles requires a 2 cycles precision and is "wake up" state dependent : */
! 1338: /* - On STF, switch must be on cycles 36/56 or 36/54 (depending on wake up state) */
! 1339: /* - On STE, switch can be on cycles 36/56 or 36/54 (no wake up state in STE) */
! 1340: /* TODO : we should change HBL signal to be on cycles 508 or 512 (it will always be 512 for now) */
1.1.1.15 root 1341: if ( ( ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle == LINE_START_CYCLE_60 )
1342: && ( LineCycles >= LINE_START_CYCLE_50 ) /* The line started in 60 Hz and continues in 50 Hz */
1343: && ( LineCycles <= ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle ) ) /* change when line is active */
1.1.1.11 root 1344: {
1.1.1.22! root 1345: /* [FIXME] 'Panic' by Paulo Simoes, dont' trigger left+2 (need 2 cycles precision) */
! 1346: /* The switch to 50 Hz on line 34 cycle 56 should just start a normal 50 Hz line, not a left+2 */
! 1347: /* For now, we detect that we're running 'Panic' and if so we don't do left+2 (ugly hack...) */
! 1348: if ( ( STMemory_ReadLong ( M68000_GetPC() ) == 0x4e7352b8 )
! 1349: && ( STMemory_ReadLong ( M68000_GetPC()+4 ) == 0x04664e73 )
! 1350: && ( HblCounterVideo == 34 ) && ( LineCycles == 56 ) )
! 1351: {
! 1352: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle = LINE_START_CYCLE_50;
! 1353: }
! 1354:
! 1355: /* Normal case where left+2 should be made */
! 1356: else
! 1357: {
! 1358: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_LEFT_PLUS_2;
! 1359: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle = LINE_END_CYCLE_50;
! 1360: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect left+2 %d<->%d\n" ,
1.1.1.15 root 1361: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
1.1.1.22! root 1362: }
1.1.1.11 root 1363: }
1364:
1.1.1.22! root 1365: /* Empty line switching freq on STF : start the line in 50 Hz, change to 60 Hz at the exact place */
1.1.1.15 root 1366: /* where display is enabled in 50 Hz, then go back to 50 Hz. */
1367: /* Due to 4 cycles precision instead of 2, we must accept a 60 Hz switch at pos 56 or 56+4 */
1368: else if ( ( FrameCycles - ShifterFrame.FreqPos60.FrameCycles <= 24 )
1369: && ( ( ShifterFrame.FreqPos60.LineCycles == LINE_START_CYCLE_50 ) || ( ShifterFrame.FreqPos60.LineCycles == LINE_START_CYCLE_50+4 ) )
1.1.1.22! root 1370: && ( LineCycles > LINE_START_CYCLE_50 )
! 1371: && ( ConfigureParams.System.nMachineType == MACHINE_ST ) )
! 1372: {
! 1373: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_EMPTY_LINE;
! 1374: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle = 0;
! 1375: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle = 0;
! 1376: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect empty line freq stf %d<->%d\n" ,
! 1377: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
! 1378: }
! 1379:
! 1380: /* Empty line switching freq on STE : similar to STF above, but doesn't require a 2 cycles precision */
! 1381: /* The switches are made at cycles 40/52 */
! 1382: else if ( ( FrameCycles - ShifterFrame.FreqPos60.FrameCycles <= 24 )
! 1383: && ( ShifterFrame.FreqPos60.LineCycles == 40 )
! 1384: && ( LineCycles == LINE_START_CYCLE_60 )
! 1385: && ( ConfigureParams.System.nMachineType == MACHINE_STE ) )
1.1.1.15 root 1386: {
1387: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_EMPTY_LINE;
1388: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle = 0;
1389: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle = 0;
1.1.1.22! root 1390: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect empty line freq ste %d<->%d\n" ,
1.1.1.15 root 1391: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
1.1.1.11 root 1392: }
1.1.1.15 root 1393:
1.1.1.22! root 1394:
1.1.1.15 root 1395: /* Remove 2 bytes to the right : start the line in 50 Hz (pos 0 or 56), change to 60 Hz before the position */
1396: /* where display is disabled in 60 Hz, then go back to 50 Hz */
1397: if ( ( LineCycles > LINE_END_CYCLE_60 ) /* back to 50 Hz after end of 60 Hz line */
1398: && ( ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle != LINE_START_CYCLE_60 ) /* start could be 0 or 56 */
1399: && ( ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle == LINE_END_CYCLE_60 ) )
1400: {
1401: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_RIGHT_MINUS_2;
1402: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect right-2 %d<->%d\n" ,
1403: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
1404: }
1405:
1.1.1.11 root 1406: }
1407:
1.1.1.15 root 1408:
1409: if ( ( ShifterFrame.Freq == 0x02 && Freq == 0x00 ) /* switched from 50 Hz to 60 Hz ? */
1410: && ( HblCounterVideo >= nStartHBL ) /* only if display is on */
1.1.1.18 root 1411: && ( HblCounterVideo < nEndHBL + BlankLines ) ) /* only if display is on */
1.1.1.15 root 1412: {
1413: /* remove right border, display 44 bytes more : switch to 60 Hz at the position where */
1.1.1.21 root 1414: /* the line ends in 50 Hz. Some programs don't switch back to 50 Hz immediately */
1.1.1.15 root 1415: /* (sync screen in SNY II), so we just check if freq changes to 60 Hz at the position where line should end in 50 Hz */
1416: if ( ( LineCycles == LINE_END_CYCLE_50 )
1417: && ( ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle == LINE_END_CYCLE_50 ) )
1418: {
1419: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_RIGHT_OFF;
1.1.1.16 root 1420: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle = LINE_END_CYCLE_NO_RIGHT;
1.1.1.15 root 1421: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect remove right %d<->%d\n" ,
1422: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
1.1.1.11 root 1423: }
1424: }
1425:
1426:
1427: /* Store cycle position of freq 50/60 to check for top/bottom border removal in Video_EndHBL. */
1.1.1.15 root 1428: if ( Freq == 0x02 ) /* switch to 50 Hz */
1.1.1.11 root 1429: {
1.1.1.13 root 1430: if ( ( HblCounterVideo < VIDEO_START_HBL_50HZ ) /* nStartHBL can change only if display is not ON yet */
1431: && ( OverscanMode & OVERSCANMODE_TOP ) == 0 ) /* update only if top was not removed */
1432: nStartHBL = VIDEO_START_HBL_50HZ;
1.1.1.11 root 1433:
1.1.1.13 root 1434: if ( ( HblCounterVideo < VIDEO_END_HBL_50HZ ) /* nEndHBL can change only if display is not OFF yet */
1.1.1.11 root 1435: && ( OverscanMode & OVERSCANMODE_BOTTOM ) == 0 ) /* update only if bottom was not removed */
1.1.1.13 root 1436: nEndHBL = VIDEO_END_HBL_50HZ; /* 263 */
1.1.1.11 root 1437: }
1.1.1.15 root 1438: else if ( Freq == 0x00 ) /* switch to 60 Hz */
1.1.1.11 root 1439: {
1.1.1.13 root 1440: if ( ( HblCounterVideo < VIDEO_START_HBL_60HZ-1 ) /* nStartHBL can change only if display is not ON yet */
1.1.1.15 root 1441: || ( ( HblCounterVideo == VIDEO_START_HBL_60HZ-1 ) && ( LineCycles <= LineRemoveTopCycle ) ) )
1.1.1.13 root 1442: nStartHBL = VIDEO_START_HBL_60HZ;
1.1.1.11 root 1443:
1.1.1.13 root 1444: if ( ( HblCounterVideo < VIDEO_END_HBL_60HZ ) /* nEndHBL can change only if display is not OFF yet */
1.1.1.11 root 1445: && ( OverscanMode & OVERSCANMODE_BOTTOM ) == 0 ) /* update only if bottom was not removed */
1.1.1.13 root 1446: nEndHBL = VIDEO_END_HBL_60HZ; /* 234 */
1447: }
1448:
1.1.1.15 root 1449:
1.1.1.13 root 1450: /* If the frequence changed, we need to update the EndLine interrupt */
1.1.1.21 root 1451: /* so that it happens TIMERB_VIDEO_CYCLE_OFFSET cycles after the current DisplayEndCycle.*/
1.1.1.13 root 1452: /* We check if the change affects the current line or the next one. */
1.1.1.15 root 1453: /* We also need to check if the HBL interrupt and nCyclesPerLine need */
1454: /* to be updated first. */
1455: if ( Freq != ShifterFrame.Freq )
1456: {
1457: /* Update HBL's position only if display has not reached pos LINE_START_CYCLE_50 */
1458: /* and HBL interrupt was already handled at the beginning of this line. */
1459: /* This also changes the number of cycles per line. */
1460: if ( ( LineCycles <= LINE_START_CYCLE_50 ) && ( HblCounterVideo == nHBL ) )
1461: {
1.1.1.22! root 1462: int CyclesPerLine_old = nCyclesPerLine;
! 1463:
1.1.1.15 root 1464: nCyclesPerLine = Video_HBL_GetPos();
1465: Video_AddInterruptHBL ( nCyclesPerLine );
1.1.1.22! root 1466:
! 1467: /* In case we're mixing 50 Hz (512 cycles) and 60 Hz (508 cycles) lines on the same screen, */
! 1468: /* we must update the position where the next VBL will happen (instead of the initial value in CyclesPerVBL) */
! 1469: /* We check if number of cycles per line changes, and if so, we update the VBL's position */
! 1470: if ( CyclesPerLine_old != nCyclesPerLine )
! 1471: {
! 1472: CyclesPerVBL += ( nCyclesPerLine - CyclesPerLine_old ); /* +4 or -4 */
! 1473: CycInt_ModifyInterrupt ( nCyclesPerLine - CyclesPerLine_old , INT_CPU_CYCLE , INTERRUPT_VIDEO_VBL );
! 1474: }
1.1.1.15 root 1475: }
1476:
1477: /* Update Timer B's position */
1478: LineTimerBCycle = Video_TimerB_GetPos ( HblCounterVideo );
1479: Video_AddInterruptTimerB ( LineTimerBCycle );
1480: }
1481:
1482:
1483: ShifterFrame.Freq = Freq;
1484: if ( Freq == 0x02 ) /* 50 Hz */
1485: {
1486: ShifterFrame.FreqPos50.VBL = nVBLs;
1487: ShifterFrame.FreqPos50.FrameCycles = FrameCycles;
1488: ShifterFrame.FreqPos50.HBL = HblCounterVideo;
1489: ShifterFrame.FreqPos50.LineCycles = LineCycles;
1490: }
1491: else
1492: {
1493: ShifterFrame.FreqPos60.VBL = nVBLs;
1494: ShifterFrame.FreqPos60.FrameCycles = FrameCycles;
1495: ShifterFrame.FreqPos60.HBL = HblCounterVideo;
1496: ShifterFrame.FreqPos60.LineCycles = LineCycles;
1497: }
1498: }
1499:
1500:
1501: /*-----------------------------------------------------------------------*/
1502: /**
1503: * Compute the cycle position where the HBL should happen on each line.
1504: * In low/med res, the position depends on the video frequency (50/60 Hz)
1505: * In high res, the position is always the same.
1506: * This position also gives the number of CPU cycles per video line.
1507: */
1508: static int Video_HBL_GetPos ( void )
1509: {
1510: int Pos;
1511:
1512: if ( ( IoMem_ReadByte ( 0xff8260 ) & 3 ) == 2 ) /* hi res */
1513: Pos = CYCLES_PER_LINE_71HZ;
1514:
1515: else /* low res or med res */
1516: {
1517: if ( IoMem_ReadByte ( 0xff820a ) & 2 ) /* 50 Hz, pos 512 */
1518: Pos = CYCLES_PER_LINE_50HZ;
1519: else /* 60 Hz, pos 508 */
1520: Pos = CYCLES_PER_LINE_60HZ;
1521: }
1522:
1523: return Pos;
1524: }
1525:
1526:
1527: /*-----------------------------------------------------------------------*/
1528: /**
1529: * Compute the cycle position where the timer B should happen on each
1530: * visible line.
1531: * We compute Timer B position for the given LineNumber, using start/end
1532: * display cycles from ShifterLines[ LineNumber ].
1533: * The position depends on the start of line / end of line positions
1534: * (which depend on the current frequency / border tricks) and
1535: * on the value of the bit 3 in the MFP's AER.
1536: * If bit is 0, timer B will count end of line events (usual case),
1537: * but if bit is 1, timer B will count start of line events (eg Seven Gates Of Jambala)
1538: */
1539: int Video_TimerB_GetPos ( int LineNumber )
1540: {
1541: int Pos;
1542:
1543: if ( ( IoMem[0xfffa03] & ( 1 << 3 ) ) == 0 ) /* we're counting end of line events */
1544: {
1545: Pos = ShifterFrame.ShifterLines[ LineNumber ].DisplayEndCycle + TIMERB_VIDEO_CYCLE_OFFSET;
1546: }
1547: else /* we're counting start of line events */
1548: {
1549: Pos = ShifterFrame.ShifterLines[ LineNumber ].DisplayStartCycle + TIMERB_VIDEO_CYCLE_OFFSET;
1550: }
1551:
1.1.1.18 root 1552: //fprintf ( stderr , "timerb pos=%d\n" , Pos );
1553: return Pos;
1554: }
1555:
1556:
1557: /*-----------------------------------------------------------------------*/
1558: /**
1559: * Compute the default cycle position where the timer B should happen
1560: * on the next line, when restarting the INTERRUPT_VIDEO_ENDLINE handler.
1561: * In low/med res, the position depends on the video frequency (50/60 Hz)
1562: * In high res, the position is always the same.
1563: */
1564: int Video_TimerB_GetDefaultPos ( void )
1565: {
1566: int Pos;
1567:
1568: if ( ( IoMem[0xfffa03] & ( 1 << 3 ) ) == 0 ) /* we're counting end of line events */
1569: {
1570: if ( ( IoMem_ReadByte ( 0xff8260 ) & 3 ) == 2 ) /* hi res */
1571: Pos = LINE_END_CYCLE_71;
1572:
1573: else /* low res or med res */
1574: {
1575: if ( IoMem_ReadByte ( 0xff820a ) & 2 ) /* 50 Hz, pos 376 */
1576: Pos = LINE_END_CYCLE_50;
1577: else /* 60 Hz, pos 372 */
1578: Pos = LINE_END_CYCLE_60;
1579: }
1580: }
1581: else /* we're counting start of line events */
1582: {
1583: if ( ( IoMem_ReadByte ( 0xff8260 ) & 3 ) == 2 ) /* hi res */
1584: Pos = LINE_START_CYCLE_71;
1585:
1586: else /* low res or med res */
1587: {
1588: if ( IoMem_ReadByte ( 0xff820a ) & 2 ) /* 50 Hz, pos 56 */
1589: Pos = LINE_START_CYCLE_50;
1590: else /* 60 Hz, pos 52 */
1591: Pos = LINE_START_CYCLE_60;
1592: }
1593: }
1594:
1595: Pos += TIMERB_VIDEO_CYCLE_OFFSET;
1596:
1597: //fprintf ( stderr , "timerb default pos=%d\n" , Pos );
1.1.1.15 root 1598: return Pos;
1599: }
1600:
1601:
1602: /*-----------------------------------------------------------------------*/
1603: /**
1604: * HBL interrupt : this occurs at the end of every line, on cycle 512 (in 50 Hz)
1605: * It takes 56 cycles to handle the 68000's exception.
1606: */
1607: void Video_InterruptHandler_HBL ( void )
1608: {
1609: int FrameCycles = Cycles_GetCounter(CYCLES_COUNTER_VIDEO);
1610: int PendingCyclesOver;
1611: int NewHBLPos;
1612:
1613: /* How many cycle was this HBL delayed (>= 0) */
1614: PendingCyclesOver = -INT_CONVERT_FROM_INTERNAL ( PendingInterruptCount , INT_CPU_CYCLE );
1615:
1616: /* Remove this interrupt from list and re-order */
1.1.1.16 root 1617: CycInt_AcknowledgeInterrupt();
1.1.1.15 root 1618:
1.1.1.17 root 1619: /* Videl Vertical counter increment (To be removed when Videl emulation is finished) */
1620: /* VFC is incremented every half line, here, we increment it every line (should be completed) */
1621: if (ConfigureParams.System.nMachineType == MACHINE_FALCON) {
1622: vfc_counter += 1;
1623: }
1624:
1625:
1.1.1.15 root 1626: /* Increment the hbl jitter index */
1627: HblJitterIndex++;
1.1.1.20 root 1628: HblJitterIndex %= HBL_JITTER_ARRAY_SIZE;
1.1.1.15 root 1629:
1630: LOG_TRACE ( TRACE_VIDEO_HBL , "HBL %d video_cyc=%d pending_cyc=%d jitter=%d\n" ,
1631: nHBL , FrameCycles , PendingCyclesOver , HblJitterArray[ HblJitterIndex ] );
1632:
1633: /* Default cycle position for next HBL */
1634: NewHBLPos = Video_HBL_GetPos();
1635:
1636: /* Generate new HBL, if need to - there are 313 HBLs per frame in 50 Hz */
1637: if (nHBL < nScanlinesPerFrame-1)
1638: Video_AddInterruptHBL ( NewHBLPos );
1639:
1.1.1.22! root 1640:
! 1641: /* In case we're mixing 50 Hz (512 cycles) and 60 Hz (508 cycles) lines on the same screen, */
! 1642: /* we must update the position where the next VBL will happen (instead of the initial value in CyclesPerVBL) */
! 1643: /* During a 50 Hz screen, each 60 Hz line will make the VBL happen 4 cycles earlier */
! 1644: if ( ( nScanlinesPerFrame == SCANLINES_PER_FRAME_50HZ )
! 1645: && ( NewHBLPos == CYCLES_PER_LINE_60HZ ) )
! 1646: {
! 1647: CyclesPerVBL -= 4;
! 1648: CycInt_ModifyInterrupt ( -4 , INT_CPU_CYCLE , INTERRUPT_VIDEO_VBL );
! 1649: }
! 1650: /* During a 60 Hz screen, each 50 Hz line will make the VBL happen 4 cycles later */
! 1651: else if ( ( nScanlinesPerFrame == SCANLINES_PER_FRAME_60HZ )
! 1652: && ( NewHBLPos == CYCLES_PER_LINE_50HZ ) )
! 1653: {
! 1654: CyclesPerVBL += 4;
! 1655: CycInt_ModifyInterrupt ( 4 , INT_CPU_CYCLE , INTERRUPT_VIDEO_VBL );
! 1656: }
! 1657:
! 1658:
1.1.1.21 root 1659: /* Print traces if pending HBL bit changed just before IACK when HBL interrupt is allowed */
1660: if ( ( CPU_IACK == true ) && ( regs.intmask < 2 ) )
1.1.1.15 root 1661: {
1.1.1.21 root 1662: if ( pendingInterrupts & ( 1 << 2 ) )
1663: {
1664: LOG_TRACE ( TRACE_VIDEO_HBL , "HBL %d, pending set again just before iack, skip one HBL interrupt VBL=%d video_cyc=%d pending_cyc=%d jitter=%d\n" ,
1665: nHBL , nVBLs , FrameCycles , PendingCyclesOver , VblJitterArray[ VblJitterIndex ] );
1666: }
1667: else
1668: {
1669: LOG_TRACE ( TRACE_VIDEO_HBL , "HBL %d, new pending HBL set just before iack VBL=%d video_cyc=%d pending_cyc=%d jitter=%d\n" ,
1670: nHBL , nVBLs , FrameCycles , PendingCyclesOver , VblJitterArray[ VblJitterIndex ] );
1671: }
1.1.1.15 root 1672: }
1673:
1.1.1.21 root 1674: /* Set pending bit for HBL interrupt in the CPU IPL */
1675: M68000_Exception(EXCEPTION_HBLANK , M68000_EXC_SRC_AUTOVEC); /* Horizontal blank interrupt, level 2 */
1676:
1.1.1.15 root 1677:
1678: Video_EndHBL(); /* Check some borders removal and copy line to display buffer */
1679:
1.1.1.17 root 1680: DmaSnd_STE_HBL_Update(); /* Update STE DMA sound if needed */
1681:
1.1.1.22! root 1682: /* TEMP IPF */
! 1683: IPF_Emulate();
! 1684: /* TEMP IPF */
! 1685:
1.1.1.15 root 1686: nHBL++; /* Increase HBL count */
1687:
1688: if (nHBL < nScanlinesPerFrame)
1689: {
1690: /* Update start cycle for next HBL */
1691: ShifterFrame.ShifterLines[ nHBL ].StartCycle = FrameCycles - PendingCyclesOver;
1692: LOG_TRACE(TRACE_VIDEO_HBL, "HBL %d start=%d %x\n", nHBL,
1693: ShifterFrame.ShifterLines[nHBL].StartCycle, ShifterFrame.ShifterLines[nHBL].StartCycle);
1694:
1695: /* Setup next HBL */
1696: Video_StartHBL();
1697: }
1698: }
1699:
1700:
1701: /*-----------------------------------------------------------------------*/
1702: /**
1703: * Check at end of each HBL to see if any Shifter hardware tricks have been attempted
1704: * and copy the line to the screen buffer.
1705: * This is the place to check if top/bottom border were removed, as well as if some
1706: * left/right border changes were not validated before.
1707: * NOTE : the tests must be made with nHBL in ascending order.
1708: */
1709: static void Video_EndHBL(void)
1710: {
1711: //
1712: // Handle top/bottom borders removal when switching freq
1713: //
1714:
1715: /* Remove top border if the switch to 60 Hz was made during this vbl before cycle */
1.1.1.21 root 1716: /* LineRemoveTopCycle on line 33 and if the switch to 50 Hz has not yet occurred or */
1717: /* occurred before the 60 Hz or occurred after cycle LineRemoveTopCycle on line 33. */
1.1.1.15 root 1718: if ( ( nHBL == VIDEO_START_HBL_60HZ-1 ) /* last HBL before first line of a 60 Hz screen */
1719: && ( ShifterFrame.FreqPos60.VBL == nVBLs ) /* switch to 60 Hz during this VBL */
1.1.1.20 root 1720: && ( ( ShifterFrame.FreqPos60.HBL < nHBL )
1721: || ( ( ShifterFrame.FreqPos60.HBL == nHBL ) && ( ShifterFrame.FreqPos60.LineCycles <= LineRemoveTopCycle ) ) )
1.1.1.15 root 1722: && ( ( ShifterFrame.FreqPos50.VBL < nVBLs )
1723: || ( ShifterFrame.FreqPos50.FrameCycles < ShifterFrame.FreqPos60.FrameCycles )
1724: || ( ShifterFrame.FreqPos50.HBL > nHBL )
1.1.1.21 root 1725: || ( ( ShifterFrame.FreqPos50.HBL == nHBL ) && ( ShifterFrame.FreqPos50.LineCycles > LineRemoveTopCycle ) ) ) )
1.1.1.15 root 1726: {
1727: /* Top border */
1728: LOG_TRACE ( TRACE_VIDEO_BORDER_V , "detect remove top\n" );
1729: OverscanMode |= OVERSCANMODE_TOP; /* Set overscan bit */
1730: nStartHBL = VIDEO_START_HBL_60HZ; /* New start screen line */
1731: pHBLPaletteMasks -= OVERSCAN_TOP; // FIXME useless ?
1732: pHBLPalettes -= OVERSCAN_TOP; // FIXME useless ?
1733: }
1734:
1735: /* Remove bottom border for a 60 Hz screen (tests are similar to the ones for top border) */
1.1.1.18 root 1736: else if ( ( nHBL == VIDEO_END_HBL_60HZ + BlankLines - 1 ) /* last displayed line in 60 Hz */
1.1.1.15 root 1737: && ( nStartHBL == VIDEO_START_HBL_60HZ ) /* screen started in 60 Hz */
1738: && ( ( OverscanMode & OVERSCANMODE_TOP ) == 0 ) /* and top border was not removed : this screen is only 60 Hz */
1739: && ( ShifterFrame.FreqPos50.VBL == nVBLs ) /* switch to 50 Hz during this VBL */
1.1.1.20 root 1740: && ( ( ShifterFrame.FreqPos50.HBL < nHBL )
1.1.1.22! root 1741: || ( ( ShifterFrame.FreqPos50.HBL == nHBL ) && ( ShifterFrame.FreqPos50.LineCycles <= LineRemoveBottomCycle-4 ) ) )
1.1.1.15 root 1742: && ( ( ShifterFrame.FreqPos60.VBL < nVBLs )
1743: || ( ShifterFrame.FreqPos60.FrameCycles < ShifterFrame.FreqPos50.FrameCycles )
1744: || ( ShifterFrame.FreqPos60.HBL > nHBL )
1.1.1.22! root 1745: || ( ( ShifterFrame.FreqPos60.HBL == nHBL ) && ( ShifterFrame.FreqPos60.LineCycles > LineRemoveBottomCycle-4 ) ) ) )
1.1.1.15 root 1746: {
1747: LOG_TRACE ( TRACE_VIDEO_BORDER_V , "detect remove bottom 60Hz\n" );
1748: OverscanMode |= OVERSCANMODE_BOTTOM;
1749: nEndHBL = SCANLINES_PER_FRAME_60HZ; /* new end for a 60 Hz screen */
1750: }
1751:
1752: /* Remove bottom border for a 50 Hz screen (tests are similar to the ones for top border) */
1.1.1.18 root 1753: else if ( ( nHBL == VIDEO_END_HBL_50HZ + BlankLines - 1 ) /* last displayed line in 50 Hz */
1.1.1.15 root 1754: && ( ( OverscanMode & OVERSCANMODE_BOTTOM ) == 0 ) /* border was not already removed at line VIDEO_END_HBL_60HZ-1 */
1755: && ( ShifterFrame.FreqPos60.VBL == nVBLs ) /* switch to 60 Hz during this VBL */
1.1.1.20 root 1756: && ( ( ShifterFrame.FreqPos60.HBL < nHBL )
1757: || ( ( ShifterFrame.FreqPos60.HBL == nHBL ) && ( ShifterFrame.FreqPos60.LineCycles <= LineRemoveBottomCycle ) ) )
1.1.1.15 root 1758: && ( ( ShifterFrame.FreqPos50.VBL < nVBLs )
1759: || ( ShifterFrame.FreqPos50.FrameCycles < ShifterFrame.FreqPos60.FrameCycles )
1760: || ( ShifterFrame.FreqPos50.HBL > nHBL )
1.1.1.21 root 1761: || ( ( ShifterFrame.FreqPos50.HBL == nHBL ) && ( ShifterFrame.FreqPos50.LineCycles > LineRemoveBottomCycle ) ) ) )
1.1.1.13 root 1762: {
1.1.1.15 root 1763: LOG_TRACE ( TRACE_VIDEO_BORDER_V , "detect remove bottom\n" );
1764: OverscanMode |= OVERSCANMODE_BOTTOM;
1765: nEndHBL = VIDEO_END_HBL_50HZ+VIDEO_HEIGHT_BOTTOM_50HZ; /* new end for a 50 Hz screen */
1766: }
1767:
1768:
1769: //
1770: // Check some left/right borders effects that were not detected earlier
1771: // (this is usually due to staying in 60 Hz for too long, which is often a bad
1772: // coding practice as it can distort the display on a real ST)
1773: //
1774:
1775: /* Special case when the line was not started in 60 Hz, then switched to 60 Hz */
1776: /* and was not restored to 50 Hz before the end of the line. In that case, the */
1777: /* line ends 2 bytes earlier on the right (line can start at LINE_START_CYCLE_71/50) */
1778: /* Some programs also turn to 60 Hz too early during the active display of the last */
1779: /* line to remove the bottom border (FNIL by TNT), in that case, we should also remove */
1780: /* 2 bytes to this line */
1781: if ( ( ( ShifterFrame.ShifterLines[ nHBL ].BorderMask & BORDERMASK_RIGHT_MINUS_2 ) == 0 )
1782: && ( ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle != LINE_START_CYCLE_60 ) /* start could be 0 or 56 */
1783: && ( ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle == LINE_END_CYCLE_60 ) )
1784: {
1785: ShifterFrame.ShifterLines[ nHBL ].BorderMask |= BORDERMASK_RIGHT_MINUS_2;
1786: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect late right-2 %d<->%d\n" ,
1787: ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle , ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle );
1788: }
1789:
1790:
1791: /* Similar case when line started in 60 Hz but did not end at the usual LINE_END_CYCLE_60 position */
1792: /* (line can end at LINE_END_CYCLE_71/50 or have right border removed) */
1793: /* This means left border had 2 bytes more to display */
1794: if ( ( ( ShifterFrame.ShifterLines[ nHBL ].BorderMask & BORDERMASK_LEFT_PLUS_2 ) == 0 )
1795: && ( ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle == LINE_START_CYCLE_60 )
1796: && ( ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle != LINE_END_CYCLE_60 ) ) /* end could be 160, 372 or 460 */
1797: {
1798: ShifterFrame.ShifterLines[ nHBL ].BorderMask |= BORDERMASK_LEFT_PLUS_2;
1799: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect late left+2 %d<->%d\n" ,
1800: ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle , ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle );
1801: }
1802:
1803:
1804: /* Although a 'left+2' was detected earlier, the freq was switched back to 60 Hz during DE, so the line is just */
1805: /* a normal 60 Hz line ; we must cancel the 'left+2' flag */
1806: else if ( ( ShifterFrame.ShifterLines[ nHBL ].BorderMask & BORDERMASK_LEFT_PLUS_2 )
1807: && ( ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle == LINE_END_CYCLE_60 ) )
1808: {
1809: ShifterFrame.ShifterLines[ nHBL ].BorderMask &= ~BORDERMASK_LEFT_PLUS_2;
1810: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "cancel late left+2 %d<->%d\n" ,
1811: ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle , ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle );
1812: }
1813:
1814:
1.1.1.13 root 1815:
1.1.1.15 root 1816: /* Store palette for very first line on screen - HBLPalettes[0] */
1817: if (nHBL == nFirstVisibleHbl-1)
1818: {
1819: /* Store ALL palette for this line into raster table for datum */
1820: Video_StoreFirstLinePalette();
1821: }
1822:
1823: if (bUseHighRes)
1824: {
1825: /* Copy for hi-res (no overscan) */
1826: if (nHBL >= nFirstVisibleHbl && nHBL < nLastVisibleHbl)
1827: Video_CopyScreenLineMono();
1828: }
1829: /* Are we in possible visible color display (including borders)? */
1830: else if (nHBL >= nFirstVisibleHbl && nHBL < nLastVisibleHbl)
1831: {
1832: /* Store resolution for every line so can check for mix low/med screens */
1833: Video_StoreResolution(nHBL-nFirstVisibleHbl);
1834:
1835: /* Copy line of screen to buffer to simulate TV raster trace
1836: * - required for mouse cursor display/game updates
1837: * Eg, Lemmings and The Killing Game Show are good examples */
1838: Video_CopyScreenLineColor();
1839: }
1840: }
1841:
1842:
1843: /*-----------------------------------------------------------------------*/
1844: /**
1845: * Set default values for the next HBL, depending on the current res/freq.
1846: * We set the number of cycles per line, as well as some default values
1847: * for display start/end cycle.
1848: */
1849: static void Video_StartHBL(void)
1850: {
1.1.1.19 root 1851: if ((IoMem_ReadByte(0xff8260) & 3) == 2) /* hi res */
1.1.1.15 root 1852: {
1853: nCyclesPerLine = CYCLES_PER_LINE_71HZ;
1854: ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle = LINE_START_CYCLE_71;
1855: ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle = LINE_END_CYCLE_71;
1856: }
1857: else
1858: {
1859: if ( IoMem_ReadByte ( 0xff820a ) & 2 ) /* 50 Hz */
1860: {
1861: nCyclesPerLine = CYCLES_PER_LINE_50HZ;
1862: if ( ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle == -1 ) /* start not set yet */
1863: ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle = LINE_START_CYCLE_50;
1864: ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle = LINE_END_CYCLE_50;
1865: }
1866: else /* 60 Hz */
1867: {
1868: nCyclesPerLine = CYCLES_PER_LINE_60HZ;
1869: if ( ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle == -1 ) /* start not set yet */
1870: ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle = LINE_START_CYCLE_60;
1871: ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle = LINE_END_CYCLE_60;
1872: }
1873: }
1.1.1.21 root 1874: //fprintf (stderr , "Video_StartHBL %d %d %d\n", nHBL , ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle , ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle );
1.1.1.15 root 1875: }
1876:
1877:
1878: /*-----------------------------------------------------------------------*/
1879: /**
1880: * End Of Line interrupt
1881: * This interrupt is started on cycle position 404 in 50 Hz and on cycle
1882: * position 400 in 60 Hz. 50 Hz display ends at cycle 376 and 60 Hz displays
1.1.1.21 root 1883: * ends at cycle 372. This means the EndLine interrupt happens 24 cycles
1.1.1.15 root 1884: * after DisplayEndCycle.
1885: * Note that if bit 3 of MFP AER is 1, then timer B will count start of line
1.1.1.21 root 1886: * instead of end of line (at cycle 52+24 or 56+24)
1.1.1.15 root 1887: */
1888: void Video_InterruptHandler_EndLine(void)
1889: {
1890: int FrameCycles, HblCounterVideo, LineCycles;
1891: int PendingCycles = -INT_CONVERT_FROM_INTERNAL ( PendingInterruptCount , INT_CPU_CYCLE );
1892:
1893: Video_GetPosition ( &FrameCycles , &HblCounterVideo , &LineCycles );
1894:
1895: LOG_TRACE ( TRACE_VIDEO_HBL , "EndLine TB %d video_cyc=%d line_cyc=%d pending_int_cnt=%d\n" ,
1896: nHBL , FrameCycles , LineCycles , PendingCycles );
1897:
1898: /* Remove this interrupt from list and re-order */
1.1.1.16 root 1899: CycInt_AcknowledgeInterrupt();
1.1.1.15 root 1900:
1901: /* Ignore HBLs in VDI mode */
1902: if (bUseVDIRes)
1903: return;
1904:
1905: /* Generate new Endline, if need to - there are 313 HBLs per frame */
1906: if (nHBL < nScanlinesPerFrame-1)
1907: {
1.1.1.21 root 1908: /* By default, next EndLine's int will be on line nHBL+1 at pos 376+24 or 372+24 */
1.1.1.15 root 1909: if ( ( IoMem[0xfffa03] & ( 1 << 3 ) ) == 0 ) /* count end of line */
1.1.1.13 root 1910: {
1.1.1.15 root 1911: /* If EndLine int is delayed too much (more than 100 cycles), nLineCycles will */
1912: /* be in the range 0..xxx instead of 400..512. In that case, we need to add */
1913: /* nCyclesPerLine to be in the range 512..x+512 */
1914: /* Maximum possible delay should be around 160 cycles on STF (DIVS) */
1915: /* In that case, HBL int will be delayed too, so we will have HblCounterVideo == nHBL+1 */
1916: if ( HblCounterVideo == nHBL+1 ) /* int happened in fact on the next line nHBL+1 */
1917: LineCycles += nCyclesPerLine;
1.1.1.13 root 1918:
1.1.1.18 root 1919: LineTimerBCycle = Video_TimerB_GetDefaultPos ();
1.1.1.13 root 1920: }
1921:
1.1.1.15 root 1922: else /* count start of line, no possible delay to handle */
1.1.1.13 root 1923: {
1.1.1.18 root 1924: LineTimerBCycle = Video_TimerB_GetDefaultPos ();
1.1.1.13 root 1925: }
1926:
1.1.1.15 root 1927: //fprintf ( stderr , "new tb %d %d %d\n" , LineTimerBCycle , nCyclesPerLine , LineTimerBCycle - LineCycles + nCyclesPerLine );
1.1.1.16 root 1928: CycInt_AddRelativeInterrupt ( LineTimerBCycle - LineCycles + nCyclesPerLine,
1.1.1.15 root 1929: INT_CPU_CYCLE, INTERRUPT_VIDEO_ENDLINE );
1.1.1.11 root 1930: }
1931:
1.1.1.15 root 1932: /* Timer B occurs at END of first visible screen line in Event Count mode */
1.1.1.18 root 1933: if ( ( nHBL >= nStartHBL ) && ( nHBL < nEndHBL + BlankLines ) )
1.1.1.11 root 1934: {
1.1.1.15 root 1935: /* Handle Timer B when using Event Count mode */
1936: /* We must ensure that the write to fffa1b to activate timer B was */
1937: /* completed before the point where the end of line signal was generated */
1938: /* (in the case of a move.b #8,$fffa1b that would happen 4 cycles */
1939: /* before end of line, the interrupt should not be generated) */
1940: if ( (MFP_TBCR == 0x08) /* Is timer in Event Count mode ? */
1941: && ( ( TimerBEventCountCycleStart == -1 ) /* timer B was started during a previous VBL */
1942: || ( TimerBEventCountCycleStart < FrameCycles-PendingCycles ) ) ) /* timer B was started before this possible interrupt */
1.1.1.21 root 1943: MFP_TimerB_EventCount_Interrupt ( PendingCycles ); /* we have a valid timer B interrupt */
1.1.1.11 root 1944: }
1.1 root 1945: }
1946:
1.1.1.2 root 1947:
1.1.1.15 root 1948:
1949:
1.1.1.2 root 1950: /*-----------------------------------------------------------------------*/
1.1.1.11 root 1951: /**
1952: * Store whole palette on first line so have reference to work from
1953: */
1.1.1.7 root 1954: static void Video_StoreFirstLinePalette(void)
1.1 root 1955: {
1.1.1.11 root 1956: Uint16 *pp2;
1957: int i;
1958:
1959: pp2 = (Uint16 *)&IoMem[0xff8240];
1960: for (i = 0; i < 16; i++)
1.1.1.22! root 1961: {
1.1.1.11 root 1962: HBLPalettes[i] = SDL_SwapBE16(*pp2++);
1.1.1.22! root 1963: if ( ConfigureParams.System.nMachineType == MACHINE_ST)
! 1964: HBLPalettes[i] &= 0x777; /* Force unused "random" bits to 0 */
! 1965: }
1.1 root 1966:
1.1.1.11 root 1967: /* And set mask flag with palette and resolution */
1968: // FIXME ; enlever PALETTEMASK_RESOLUTION
1969:
1.1.1.15 root 1970: // if ( ShifterFrame.ShifterLines[ nFirstVisibleHbl ].BorderMask == BORDERMASK_NONE ) // no border trick, store the current res
1.1.1.11 root 1971: HBLPaletteMasks[0] = (PALETTEMASK_RESOLUTION|PALETTEMASK_PALETTE) | (((Uint32)IoMem_ReadByte(0xff8260)&0x3)<<16);
1972: // else // border removal, assume low res for the whole line
1973: // HBLPaletteMasks[0] = (PALETTEMASK_RESOLUTION|PALETTEMASK_PALETTE) | (0<<16);
1.1 root 1974: }
1975:
1.1.1.2 root 1976:
1977: /*-----------------------------------------------------------------------*/
1.1.1.11 root 1978: /**
1979: * Store resolution on each line (used to test if mixed low/medium resolutions)
1980: */
1.1.1.7 root 1981: static void Video_StoreResolution(int y)
1.1 root 1982: {
1.1.1.11 root 1983: Uint8 res;
1984: int Mask;
1.1 root 1985:
1.1.1.11 root 1986: /* Clear resolution, and set with current value */
1987: if (!(bUseHighRes || bUseVDIRes))
1988: {
1.1.1.20 root 1989: if ( y >= HBL_PALETTE_MASKS ) /* we're above the limit (res was switched to mono for more than 1 VBL in color mode ?) */
1990: {
1991: // fprintf ( stderr , "store res %d line %d hbl %d %x %x %d\n" , res , y , nHBL, Mask , HBLPaletteMasks[y] , sizeof(HBLPalettes) );
1992: y = HBL_PALETTE_MASKS - 1; /* store in the last palette line */
1993: }
1994:
1.1.1.11 root 1995: HBLPaletteMasks[y] &= ~(0x3<<16);
1996: res = IoMem_ReadByte(0xff8260)&0x3;
1997:
1.1.1.15 root 1998: Mask = ShifterFrame.ShifterLines[ y+nFirstVisibleHbl ].BorderMask;
1.1.1.11 root 1999:
1.1.1.15 root 2000: if ( Mask & BORDERMASK_OVERSCAN_MED_RES ) /* special case for med res to render the overscan line */
2001: res = 1; /* med res instead of low res */
1.1.1.11 root 2002: else if ( Mask != BORDERMASK_NONE ) /* border removal : assume low res for the whole line */
2003: res = 0;
1.1.1.2 root 2004:
1.1.1.11 root 2005: HBLPaletteMasks[y] |= PALETTEMASK_RESOLUTION|((Uint32)res)<<16;
2006:
2007: #if 0
2008: if ( ( Mask == BORDERMASK_NONE ) /* no border trick, store the current res */
2009: || ( res == 0 ) || ( res == 1 ) ) /* if border trick, ignore passage to hi res */
2010: HBLPaletteMasks[y] |= PALETTEMASK_RESOLUTION|((Uint32)res)<<16;
2011: else /* border removal or hi res : assume low res for the whole line */
2012: HBLPaletteMasks[y] |= (0)<<16;
2013:
1.1.1.15 root 2014: /* special case for med res to render the overscan line */
2015: if ( Mask & BORDERMASK_OVERSCAN_MED_RES )
2016: HBLPaletteMasks[y] |= PALETTEMASK_RESOLUTION|((Uint32)1)<<16; /* med res instead of low res */
1.1.1.11 root 2017: #endif
1.1 root 2018:
1.1.1.11 root 2019: // fprintf ( stderr , "store res %d line %d %x %x\n" , res , y , Mask , HBLPaletteMasks[y] );
2020: }
1.1.1.9 root 2021: }
2022:
2023:
2024: /*-----------------------------------------------------------------------*/
1.1.1.11 root 2025: /**
2026: * Copy one line of monochrome screen into buffer for conversion later.
2027: */
2028: static void Video_CopyScreenLineMono(void)
2029: {
2030: /* Copy one line - 80 bytes in ST high resolution */
2031: memcpy(pSTScreen, pVideoRaster, SCREENBYTES_MONOLINE);
2032: pVideoRaster += SCREENBYTES_MONOLINE;
2033:
2034: /* Handle STE fine scrolling (HWScrollCount is zero on ST). */
2035: if (HWScrollCount)
2036: {
2037: Uint16 *pScrollAdj;
2038: int nNegScrollCnt;
2039:
2040: pScrollAdj = (Uint16 *)pSTScreen;
2041: nNegScrollCnt = 16 - HWScrollCount;
2042:
2043: /* Shift the whole line by the given scroll count */
2044: while ((Uint8*)pScrollAdj < pSTScreen + SCREENBYTES_MONOLINE-2)
2045: {
2046: do_put_mem_word(pScrollAdj, (do_get_mem_word(pScrollAdj) << HWScrollCount)
2047: | (do_get_mem_word(pScrollAdj+1) >> nNegScrollCnt));
2048: ++pScrollAdj;
2049: }
2050:
2051: /* Handle the last 16 pixels of the line */
2052: do_put_mem_word(pScrollAdj, (do_get_mem_word(pScrollAdj) << HWScrollCount)
2053: | (do_get_mem_word(pVideoRaster) >> nNegScrollCnt));
2054:
2055: /* HW scrolling advances Shifter video counter by one */
2056: pVideoRaster += 1 * 2;
2057: }
2058:
2059: /* LineWidth is zero on ST. */
2060: /* On STE, the Shifter skips the given amount of words. */
2061: pVideoRaster += LineWidth*2;
2062:
2063: /* On STE, handle modifications of the video counter address $ff8205/07/09 */
2064: /* that occurred while the display was already ON */
1.1.1.16 root 2065: if ( VideoCounterDelayedOffset != 0 )
1.1.1.11 root 2066: {
1.1.1.16 root 2067: pVideoRaster += ( VideoCounterDelayedOffset & ~1 );
2068: VideoCounterDelayedOffset = 0;
1.1.1.11 root 2069: }
1.1.1.16 root 2070:
2071: if ( pVideoRasterDelayed != NULL )
1.1.1.11 root 2072: {
1.1.1.16 root 2073: pVideoRaster = pVideoRasterDelayed;
2074: pVideoRasterDelayed = NULL;
1.1.1.11 root 2075: }
2076:
2077: /* On STE, if we wrote to the hwscroll register, we set the */
2078: /* new value here, once the current line was processed */
2079: if ( NewHWScrollCount >= 0 )
2080: {
2081: HWScrollCount = NewHWScrollCount;
2082: NewHWScrollCount = -1;
2083: }
2084:
2085: /* On STE, if we wrote to the linewidth register, we set the */
2086: /* new value here, once the current line was processed */
2087: if ( NewLineWidth >= 0 )
2088: {
2089: LineWidth = NewLineWidth;
2090: NewLineWidth = -1;
2091: }
2092:
2093: /* Each screen line copied to buffer is always same length */
2094: pSTScreen += SCREENBYTES_MONOLINE;
1.1.1.22! root 2095:
! 2096: /* We must keep the new video address in a 24 bit space */
! 2097: /* (in case it pointed to IO space and is now >= 0x1000000) */
! 2098: pVideoRaster = ( ( pVideoRaster - STRam ) & 0xffffff ) + STRam;
1.1.1.11 root 2099: }
2100:
2101:
2102: /*-----------------------------------------------------------------------*/
2103: /**
2104: * Copy one line of color screen into buffer for conversion later.
2105: * Possible lines may be top/bottom border, and/or left/right borders.
2106: */
1.1.1.9 root 2107: static void Video_CopyScreenLineColor(void)
2108: {
1.1.1.15 root 2109: int LineBorderMask;
1.1.1.11 root 2110: int VideoOffset = 0;
2111: int STF_PixelScroll = 0;
1.1.1.14 root 2112: int LineRes;
1.1.1.17 root 2113: Uint8 *pVideoRasterEndLine; /* addr of the last byte copied from pVideoRaster to pSTScreen (for HWScrollCount) */
2114: int i;
1.1.1.14 root 2115:
1.1.1.15 root 2116: LineBorderMask = ShifterFrame.ShifterLines[ nHBL ].BorderMask;
1.1.1.16 root 2117: STF_PixelScroll = ShifterFrame.ShifterLines[ nHBL ].DisplayPixelShift;
1.1.1.15 root 2118:
2119: /* Get resolution for this line (in case of mixed low/med screen) */
1.1.1.20 root 2120: i = nHBL-nFirstVisibleHbl;
2121: if ( i >= HBL_PALETTE_MASKS )
2122: i = HBL_PALETTE_MASKS - 1;
2123: LineRes = ( HBLPaletteMasks[i] >> 16 ) & 1; /* 0=low res 1=med res */
1.1.1.11 root 2124:
1.1.1.16 root 2125: //fprintf(stderr , "copy line %d start %d end %d 0x%x 0x%x\n" , nHBL, nStartHBL, nEndHBL, LineBorderMask, pVideoRaster - STRam);
1.1.1.11 root 2126:
1.1.1.22! root 2127: /* FIXME [NP] : when removing left border and displaying med res at 60 Hz on STE, we have a 3 pixel shift */
! 2128: /* to correct to have bitmaps and color changes in sync. */
! 2129: /* For now we only shift for med @ 60 Hz, but this should be measured for all */
! 2130: /* freq and low / med res combinations on a real STE (fix "HighResMode" demo by Paradox). */
! 2131: if ( ( ConfigureParams.System.nMachineType == MACHINE_STE )
! 2132: && ( LineBorderMask & BORDERMASK_LEFT_OFF_MED )
! 2133: && ( nCyclesPerLine == 508 )
! 2134: )
! 2135: {
! 2136: STF_PixelScroll = 3;
! 2137: }
! 2138:
1.1.1.11 root 2139: /* If left border is opened, we need to compensate one missing word in low res (1 plan) */
1.1.1.15 root 2140: /* If overscan is in med res, the offset is variable */
2141: if ( LineBorderMask & BORDERMASK_OVERSCAN_MED_RES )
2142: VideoOffset = - ( ( LineBorderMask >> 20 ) & 0x0f ); /* No Cooper=0 PYM=-2 in med res overscan */
1.1.1.11 root 2143:
2144: else if ( LineBorderMask & BORDERMASK_LEFT_OFF )
1.1.1.18 root 2145: {
2146: #ifdef SCROLL2_4PX
2147: int ShiftPixels = 0;
2148:
2149: if ( STF_PixelScroll == 13 ) { VideoOffset = 2; ShiftPixels = 8; }
2150: else if ( STF_PixelScroll == 9 ) { VideoOffset = 0; ShiftPixels = 8; }
2151: else if ( STF_PixelScroll == 5 ) { VideoOffset = -2; ShiftPixels = 8; }
2152: else if ( STF_PixelScroll == 1 ) { VideoOffset = -4; ShiftPixels = 8; }
2153:
2154: else VideoOffset = -2; /* Normal low res left border removal without 4 pixels scrolling */
2155:
2156: STF_PixelScroll -= ShiftPixels;
2157: #else
1.1.1.14 root 2158: VideoOffset = -2; /* always 2 bytes in low res overscan */
1.1.1.18 root 2159: #endif
2160: }
1.1.1.11 root 2161:
1.1.1.16 root 2162: else if ( LineBorderMask & BORDERMASK_LEFT_OFF_2_STE )
2163: VideoOffset = -4; /* 4 first bytes of the line are not shown */
2164:
1.1.1.11 root 2165: /* Handle 4 pixels hardware scrolling ('ST Cnx' demo in 'Punish Your Machine') */
2166: /* Depending on the number of pixels, we need to compensate for some skipped words */
1.1.1.15 root 2167: else if ( LineBorderMask & BORDERMASK_LEFT_OFF_MED )
1.1.1.11 root 2168: {
1.1.1.16 root 2169: if ( STF_PixelScroll == 13 ) VideoOffset = 2;
2170: else if ( STF_PixelScroll == 9 ) VideoOffset = 0;
2171: else if ( STF_PixelScroll == 5 ) VideoOffset = -2;
2172: else if ( STF_PixelScroll == 1 ) VideoOffset = -4;
1.1.1.11 root 2173: else VideoOffset = 0; /* never used ? */
2174:
1.1.1.16 root 2175: STF_PixelScroll -= 8; /* removing left border in mid res also shifts display to the left */
1.1.1.11 root 2176: // fprintf(stderr , "scr off %d %d\n" , STF_PixelScroll , VideoOffset);
2177: }
2178:
1.1.1.13 root 2179:
1.1.1.11 root 2180: /* Is total blank line? I.e. top/bottom border? */
1.1.1.18 root 2181: if ((nHBL < nStartHBL) || (nHBL >= nEndHBL + BlankLines)
1.1.1.15 root 2182: || (LineBorderMask & BORDERMASK_EMPTY_LINE))
1.1.1.11 root 2183: {
2184: /* Clear line to color '0' */
2185: memset(pSTScreen, 0, SCREENBYTES_LINE);
2186: }
2187: else
2188: {
1.1.1.18 root 2189: /* Does have left border ? */
1.1.1.16 root 2190: if ( LineBorderMask & ( BORDERMASK_LEFT_OFF | BORDERMASK_LEFT_OFF_MED ) ) /* bigger line by 26 bytes on the left */
1.1.1.11 root 2191: {
2192: pVideoRaster += BORDERBYTES_LEFT-SCREENBYTES_LEFT+VideoOffset;
2193: memcpy(pSTScreen, pVideoRaster, SCREENBYTES_LEFT);
2194: pVideoRaster += SCREENBYTES_LEFT;
2195: }
1.1.1.16 root 2196: else if ( LineBorderMask & BORDERMASK_LEFT_OFF_2_STE ) /* bigger line by 20 bytes on the left (STE specific) */
2197: { /* bytes 0-3 are not shown, only next 16 bytes (32 pixels, 4 bitplanes) */
2198: if ( SCREENBYTES_LEFT > BORDERBYTES_LEFT_2_STE )
2199: {
2200: memset ( pSTScreen, 0, SCREENBYTES_LEFT-BORDERBYTES_LEFT_2_STE+4 ); /* clear unused pixels + bytes 0-3 */
2201: memcpy ( pSTScreen+SCREENBYTES_LEFT-BORDERBYTES_LEFT_2_STE+4, pVideoRaster+VideoOffset+4, BORDERBYTES_LEFT_2_STE-4 );
2202: }
2203: else
2204: memcpy ( pSTScreen, pVideoRaster+BORDERBYTES_LEFT_2_STE-SCREENBYTES_LEFT+VideoOffset, SCREENBYTES_LEFT );
2205:
2206: pVideoRaster += BORDERBYTES_LEFT_2_STE+VideoOffset;
2207: }
2208: else if (LineBorderMask & BORDERMASK_LEFT_PLUS_2) /* bigger line by 2 bytes on the left */
1.1.1.11 root 2209: {
1.1.1.16 root 2210: if ( SCREENBYTES_LEFT > 2 )
2211: {
2212: memset(pSTScreen,0,SCREENBYTES_LEFT-2); /* clear unused pixels */
2213: memcpy(pSTScreen+SCREENBYTES_LEFT-2, pVideoRaster, 2);
2214: }
2215: else
2216: { /* nothing to copy, left border is not large enough */
2217: }
2218:
1.1.1.11 root 2219: pVideoRaster += 2;
2220: }
1.1.1.16 root 2221: else if (bSteBorderFlag) /* bigger line by 8 bytes on the left (STE specific) */
1.1.1.12 root 2222: {
1.1.1.16 root 2223: if ( SCREENBYTES_LEFT > 4*2 )
2224: {
2225: memset(pSTScreen,0,SCREENBYTES_LEFT-4*2); /* clear unused pixels */
2226: memcpy(pSTScreen+SCREENBYTES_LEFT-4*2, pVideoRaster, 4*2);
2227: }
2228: else
2229: { /* nothing to copy, left border is not large enough */
2230: }
2231:
1.1.1.12 root 2232: pVideoRaster += 4*2;
2233: }
1.1.1.11 root 2234: else
1.1.1.16 root 2235: memset(pSTScreen,0,SCREENBYTES_LEFT); /* left border not removed, clear to color '0' */
1.1.1.11 root 2236:
2237: /* Short line due to hires in the middle ? */
2238: if (LineBorderMask & BORDERMASK_STOP_MIDDLE)
2239: {
2240: /* 106 bytes less in the line */
2241: memcpy(pSTScreen+SCREENBYTES_LEFT, pVideoRaster, SCREENBYTES_MIDDLE-106);
1.1.1.12 root 2242: memset(pSTScreen+SCREENBYTES_LEFT+SCREENBYTES_MIDDLE-106, 0, 106); /* clear unused pixels */
1.1.1.11 root 2243: pVideoRaster += (SCREENBYTES_MIDDLE-106);
2244: }
2245: else
2246: {
2247: /* normal middle part (160 bytes) */
2248: memcpy(pSTScreen+SCREENBYTES_LEFT, pVideoRaster, SCREENBYTES_MIDDLE);
2249: pVideoRaster += SCREENBYTES_MIDDLE;
2250: }
2251:
2252: /* Does have right border ? */
2253: if (LineBorderMask & BORDERMASK_RIGHT_OFF)
2254: {
2255: memcpy(pSTScreen+SCREENBYTES_LEFT+SCREENBYTES_MIDDLE, pVideoRaster, SCREENBYTES_RIGHT);
1.1.1.17 root 2256: pVideoRasterEndLine = pVideoRaster + SCREENBYTES_RIGHT;
1.1.1.16 root 2257: pVideoRaster += BORDERBYTES_RIGHT;
1.1.1.11 root 2258: }
2259: else if (LineBorderMask & BORDERMASK_RIGHT_MINUS_2)
2260: {
2261: /* Shortened line by 2 bytes */
2262: memset(pSTScreen+SCREENBYTES_LEFT+SCREENBYTES_MIDDLE-2, 0, SCREENBYTES_RIGHT+2);
2263: pVideoRaster -= 2;
1.1.1.17 root 2264: pVideoRasterEndLine = pVideoRaster;
1.1.1.11 root 2265: }
2266: else
2267: {
2268: /* Simply clear right border to '0' */
2269: memset(pSTScreen+SCREENBYTES_LEFT+SCREENBYTES_MIDDLE,0,SCREENBYTES_RIGHT);
1.1.1.17 root 2270: pVideoRasterEndLine = pVideoRaster;
1.1.1.11 root 2271: }
2272:
1.1.1.18 root 2273: /* Shifter read bytes and borders can change, but display is blank, so finally clear the line with color 0 */
2274: if (LineBorderMask & BORDERMASK_BLANK_LINE)
2275: memset(pSTScreen, 0, SCREENBYTES_LINE);
2276:
1.1.1.11 root 2277: /* Full right border removal up to the end of the line (cycle 512) */
2278: if (LineBorderMask & BORDERMASK_RIGHT_OFF_FULL)
2279: pVideoRaster += BORDERBYTES_RIGHT_FULL;
2280:
2281: /* Correct the offset for pVideoRaster from BORDERMASK_LEFT_OFF above if needed */
2282: pVideoRaster -= VideoOffset; /* VideoOffset is 0 or -2 */
2283:
2284:
2285: /* STE specific */
1.1.1.13 root 2286: if (!bSteBorderFlag && HWScrollCount) /* Handle STE fine scrolling (HWScrollCount is zero on ST) */
1.1.1.11 root 2287: {
1.1.1.13 root 2288: Uint16 *pScrollAdj; /* Pointer to actual position in line */
1.1.1.11 root 2289: int nNegScrollCnt;
1.1.1.13 root 2290: Uint16 *pScrollEndAddr; /* Pointer to end of the line */
1.1.1.11 root 2291:
2292: nNegScrollCnt = 16 - HWScrollCount;
2293: if (LineBorderMask & BORDERMASK_LEFT_OFF)
2294: pScrollAdj = (Uint16 *)pSTScreen;
1.1.1.16 root 2295: else if (LineBorderMask & BORDERMASK_LEFT_OFF_2_STE)
2296: {
2297: if ( SCREENBYTES_LEFT > BORDERBYTES_LEFT_2_STE )
1.1.1.17 root 2298: pScrollAdj = (Uint16 *)(pSTScreen+8); /* don't scroll the 8 first bytes (keep color 0)*/
1.1.1.16 root 2299: else
2300: pScrollAdj = (Uint16 *)pSTScreen; /* we render less bytes on screen than a real ST, scroll the whole line */
2301: }
1.1.1.11 root 2302: else
2303: pScrollAdj = (Uint16 *)(pSTScreen + SCREENBYTES_LEFT);
1.1.1.16 root 2304:
1.1.1.17 root 2305: /* When shifting the line to the left, we will have 'HWScrollCount' missing pixels at */
2306: /* the end of the line. We must complete these last 16 pixels with pixels from the */
2307: /* video counter last accessed value in pVideoRasterEndLine. */
2308: /* There're 2 passes : */
2309: /* - shift whole line except the last 16 pixels */
2310: /* - shift/complete the last 16 pixels */
2311:
2312: /* Addr of the last byte to shift in the 1st pass (excluding the last 16 pixels of the line) */
1.1.1.11 root 2313: if (LineBorderMask & BORDERMASK_RIGHT_OFF)
2314: pScrollEndAddr = (Uint16 *)(pSTScreen + SCREENBYTES_LINE - 8);
2315: else
2316: pScrollEndAddr = (Uint16 *)(pSTScreen + SCREENBYTES_LEFT + SCREENBYTES_MIDDLE - 8);
2317:
1.1.1.17 root 2318:
2319: if ( LineRes == 1 ) /* med res */
1.1.1.11 root 2320: {
1.1.1.15 root 2321: /* in med res, 16 pixels are 4 bytes, not 8 as in low res, so only the last 4 bytes need a special case */
1.1.1.17 root 2322: pScrollEndAddr += 2; /* 2 Uint16 = 4 bytes = 16 pixels */
1.1.1.14 root 2323:
1.1.1.17 root 2324: /* Shift the whole line to the left by the given scroll count (except the last 16 pixels) */
1.1.1.14 root 2325: while (pScrollAdj < pScrollEndAddr)
2326: {
2327: do_put_mem_word(pScrollAdj, (do_get_mem_word(pScrollAdj) << HWScrollCount)
2328: | (do_get_mem_word(pScrollAdj+2) >> nNegScrollCnt));
2329: ++pScrollAdj;
2330: }
1.1.1.17 root 2331: /* Handle the last 16 pixels of the line (complete the line with pixels from pVideoRasterEndLine) */
2332: for ( i=0 ; i<2 ; i++ )
2333: do_put_mem_word(pScrollAdj+i, (do_get_mem_word(pScrollAdj+i) << HWScrollCount)
2334: | (do_get_mem_word(pVideoRasterEndLine+i*2) >> nNegScrollCnt));
1.1.1.14 root 2335:
2336: /* Depending on whether $ff8264 or $ff8265 was used to scroll, */
2337: /* we prefetched 16 pixel (4 bytes) */
1.1.1.13 root 2338: if ( HWScrollPrefetch == 1 ) /* $ff8265 prefetches 16 pixels */
2339: pVideoRaster += 2 * 2; /* 2 bitplans */
1.1.1.14 root 2340:
2341: /* If scrolling with $ff8264, there's no prefetch, which means display starts */
2342: /* 16 pixels later but still stops at the normal point (eg we display */
2343: /* (320-16) pixels in low res). We shift the whole line 4 bytes to the right to */
2344: /* get the correct result (using memmove, as src/dest are overlapping). */
2345: else
2346: {
2347: if (LineBorderMask & BORDERMASK_RIGHT_OFF)
2348: memmove ( pSTScreen+4 , pSTScreen , SCREENBYTES_LINE - 4 );
2349: else
2350: memmove ( pSTScreen+4 , pSTScreen , SCREENBYTES_LEFT + SCREENBYTES_MIDDLE - 4 );
2351:
2352: memset ( pSTScreen , 0 , 4 ); /* first 16 pixels are color '0' */
2353: }
1.1.1.11 root 2354: }
1.1.1.14 root 2355:
1.1.1.17 root 2356: else /* low res */
1.1.1.11 root 2357: {
1.1.1.17 root 2358: /* Shift the whole line to the left by the given scroll count (except the last 16 pixels) */
1.1.1.11 root 2359: while (pScrollAdj < pScrollEndAddr)
2360: {
2361: do_put_mem_word(pScrollAdj, (do_get_mem_word(pScrollAdj) << HWScrollCount)
2362: | (do_get_mem_word(pScrollAdj+4) >> nNegScrollCnt));
2363: ++pScrollAdj;
2364: }
1.1.1.17 root 2365: /* Handle the last 16 pixels of the line (complete the line with pixels from pVideoRasterEndLine) */
2366: for ( i=0 ; i<4 ; i++ )
2367: do_put_mem_word(pScrollAdj+i, (do_get_mem_word(pScrollAdj+i) << HWScrollCount)
2368: | (do_get_mem_word(pVideoRasterEndLine+i*2) >> nNegScrollCnt));
1.1.1.13 root 2369:
2370: /* Depending on whether $ff8264 or $ff8265 was used to scroll, */
2371: /* we prefetched 16 pixel (8 bytes) */
2372: if ( HWScrollPrefetch == 1 ) /* $ff8265 prefetches 16 pixels */
2373: pVideoRaster += 4 * 2; /* 4 bitplans */
2374:
2375: /* If scrolling with $ff8264, there's no prefetch, which means display starts */
2376: /* 16 pixels later but still stops at the normal point (eg we display */
2377: /* (320-16) pixels in low res). We shift the whole line 8 bytes to the right to */
2378: /* get the correct result (using memmove, as src/dest are overlapping). */
2379: else
2380: {
2381: if (LineBorderMask & BORDERMASK_RIGHT_OFF)
2382: memmove ( pSTScreen+8 , pSTScreen , SCREENBYTES_LINE - 8 );
2383: else
2384: memmove ( pSTScreen+8 , pSTScreen , SCREENBYTES_LEFT + SCREENBYTES_MIDDLE - 8 );
2385:
2386: memset ( pSTScreen , 0 , 8 ); /* first 16 pixels are color '0' */
2387: }
1.1.1.11 root 2388:
2389: /* On STE, when we have a 230 bytes overscan line and HWScrollCount > 0 */
1.1.1.17 root 2390: /* we must read 6 bytes less than expected if scrolling is using prefetching ($ff8265) */
2391: /* (this is not the case for the 224 bytes overscan which is a multiple of 8) */
1.1.1.11 root 2392: if ( (LineBorderMask & BORDERMASK_LEFT_OFF) && (LineBorderMask & BORDERMASK_RIGHT_OFF) )
1.1.1.17 root 2393: {
2394: if ( HWScrollPrefetch == 1 )
2395: pVideoRaster -= 6; /* we don't add 8 bytes (see above), but 2 */
2396: else
2397: pVideoRaster -= 0;
2398: }
1.1.1.11 root 2399:
2400: }
2401: }
2402:
2403: /* LineWidth is zero on ST. */
2404: /* On STE, the Shifter skips the given amount of words. */
2405: pVideoRaster += LineWidth*2;
2406:
2407: /* On STE, handle modifications of the video counter address $ff8205/07/09 */
2408: /* that occurred while the display was already ON */
1.1.1.16 root 2409: if ( VideoCounterDelayedOffset != 0 )
1.1.1.11 root 2410: {
1.1.1.16 root 2411: pVideoRaster += ( VideoCounterDelayedOffset & ~1 );
2412: // fprintf ( stderr , "adjust video counter offset=%d new video=%x\n" , VideoCounterDelayedOffset , pVideoRaster-STRam );
2413: VideoCounterDelayedOffset = 0;
1.1.1.11 root 2414: }
1.1.1.16 root 2415:
2416: if ( pVideoRasterDelayed != NULL )
1.1.1.11 root 2417: {
1.1.1.16 root 2418: pVideoRaster = pVideoRasterDelayed;
2419: // fprintf ( stderr , "adjust video counter const new video=%x\n" , pVideoRaster-STRam );
2420: pVideoRasterDelayed = NULL;
1.1.1.11 root 2421: }
2422:
2423: /* On STE, if we wrote to the hwscroll register, we set the */
2424: /* new value here, once the current line was processed */
2425: if ( NewHWScrollCount >= 0 )
2426: {
2427: HWScrollCount = NewHWScrollCount;
1.1.1.13 root 2428: HWScrollPrefetch = NewHWScrollPrefetch;
1.1.1.11 root 2429: NewHWScrollCount = -1;
1.1.1.13 root 2430: NewHWScrollPrefetch = -1;
2431: }
2432:
2433: /* On STE, if we trigger the left border + 16 pixels trick, we set the */
2434: /* new value here, once the current line was processed */
2435: if ( NewSteBorderFlag >= 0 )
2436: {
2437: if ( NewSteBorderFlag == 0 )
1.1.1.15 root 2438: bSteBorderFlag = false;
1.1.1.13 root 2439: else
1.1.1.15 root 2440: bSteBorderFlag = true;
1.1.1.13 root 2441: NewSteBorderFlag = -1;
1.1.1.11 root 2442: }
2443:
2444: /* On STE, if we wrote to the linewidth register, we set the */
2445: /* new value here, once the current line was processed */
2446: if ( NewLineWidth >= 0 )
2447: {
2448: LineWidth = NewLineWidth;
2449: NewLineWidth = -1;
2450: }
1.1.1.16 root 2451:
2452:
2453: /* Handle 4 pixels hardware scrolling ('ST Cnx' demo in 'Punish Your Machine') */
1.1.1.21 root 2454: /* as well as scrolling occurring when removing the left border. */
1.1.1.16 root 2455: /* If >0, shift the line by STF_PixelScroll pixels to the right */
2456: /* If <0, shift the line by -STF_PixelScroll pixels to the left */
2457: /* This should be handled after the STE's hardware scrolling as it will scroll */
2458: /* the whole displayed area (while the STE scrolls pixels inside the displayed area) */
2459: if ( STF_PixelScroll > 0 )
2460: {
2461: Uint16 *pScreenLineEnd;
2462: int count;
2463:
2464: pScreenLineEnd = (Uint16 *) ( pSTScreen + SCREENBYTES_LINE - 2 );
1.1.1.17 root 2465: if ( LineRes == 0 ) /* low res */
2466: {
2467: for ( count = 0 ; count < ( SCREENBYTES_LINE - 8 ) / 2 ; count++ , pScreenLineEnd-- )
2468: do_put_mem_word ( pScreenLineEnd , ( ( do_get_mem_word ( pScreenLineEnd - 4 ) << 16 ) | ( do_get_mem_word ( pScreenLineEnd ) ) ) >> STF_PixelScroll );
2469: /* Handle the first 16 pixels of the line (add color 0 pixels to the extreme left) */
2470: do_put_mem_word ( pScreenLineEnd-0 , ( do_get_mem_word ( pScreenLineEnd-0 ) >> STF_PixelScroll ) );
2471: do_put_mem_word ( pScreenLineEnd-1 , ( do_get_mem_word ( pScreenLineEnd-1 ) >> STF_PixelScroll ) );
2472: do_put_mem_word ( pScreenLineEnd-2 , ( do_get_mem_word ( pScreenLineEnd-2 ) >> STF_PixelScroll ) );
2473: do_put_mem_word ( pScreenLineEnd-3 , ( do_get_mem_word ( pScreenLineEnd-3 ) >> STF_PixelScroll ) );
2474: }
2475: else /* med res */
2476: {
2477: for ( count = 0 ; count < ( SCREENBYTES_LINE - 4 ) / 2 ; count++ , pScreenLineEnd-- )
2478: do_put_mem_word ( pScreenLineEnd , ( ( do_get_mem_word ( pScreenLineEnd - 2 ) << 16 ) | ( do_get_mem_word ( pScreenLineEnd ) ) ) >> STF_PixelScroll );
2479: /* Handle the first 16 pixels of the line (add color 0 pixels to the extreme left) */
2480: do_put_mem_word ( pScreenLineEnd-0 , ( do_get_mem_word ( pScreenLineEnd-0 ) >> STF_PixelScroll ) );
2481: do_put_mem_word ( pScreenLineEnd-1 , ( do_get_mem_word ( pScreenLineEnd-1 ) >> STF_PixelScroll ) );
2482: }
1.1.1.16 root 2483: }
2484: else if ( STF_PixelScroll < 0 )
2485: {
2486: Uint16 *pScreenLineStart;
2487: int count;
2488:
2489: STF_PixelScroll = -STF_PixelScroll;
2490: pScreenLineStart = (Uint16 *)pSTScreen;
1.1.1.17 root 2491: if ( LineRes == 0 ) /* low res */
2492: {
2493: for ( count = 0 ; count < ( SCREENBYTES_LINE - 8 ) / 2 ; count++ , pScreenLineStart++ )
2494: do_put_mem_word ( pScreenLineStart , ( ( do_get_mem_word ( pScreenLineStart ) << STF_PixelScroll ) | ( do_get_mem_word ( pScreenLineStart + 4 ) >> (16-STF_PixelScroll) ) ) );
2495: /* Handle the last 16 pixels of the line (add color 0 pixels to the extreme right) */
2496: do_put_mem_word ( pScreenLineStart+0 , ( do_get_mem_word ( pScreenLineStart+0 ) << STF_PixelScroll ) );
2497: do_put_mem_word ( pScreenLineStart+1 , ( do_get_mem_word ( pScreenLineStart+1 ) << STF_PixelScroll ) );
2498: do_put_mem_word ( pScreenLineStart+2 , ( do_get_mem_word ( pScreenLineStart+2 ) << STF_PixelScroll ) );
2499: do_put_mem_word ( pScreenLineStart+3 , ( do_get_mem_word ( pScreenLineStart+3 ) << STF_PixelScroll ) );
2500: }
2501: else /* med res */
2502: {
2503: for ( count = 0 ; count < ( SCREENBYTES_LINE - 4 ) / 2 ; count++ , pScreenLineStart++ )
2504: do_put_mem_word ( pScreenLineStart , ( ( do_get_mem_word ( pScreenLineStart ) << STF_PixelScroll ) | ( do_get_mem_word ( pScreenLineStart + 2 ) >> (16-STF_PixelScroll) ) ) );
2505: /* Handle the last 16 pixels of the line (add color 0 pixels to the extreme right) */
2506: do_put_mem_word ( pScreenLineStart+0 , ( do_get_mem_word ( pScreenLineStart+0 ) << STF_PixelScroll ) );
2507: do_put_mem_word ( pScreenLineStart+1 , ( do_get_mem_word ( pScreenLineStart+1 ) << STF_PixelScroll ) );
2508: }
1.1.1.16 root 2509: }
1.1.1.11 root 2510: }
2511:
2512: /* Each screen line copied to buffer is always same length */
2513: pSTScreen += SCREENBYTES_LINE;
1.1.1.22! root 2514:
! 2515: /* We must keep the new video address in a 24 bit space */
! 2516: /* (in case it pointed to IO space and is now >= 0x1000000) */
! 2517: pVideoRaster = ( ( pVideoRaster - STRam ) & 0xffffff ) + STRam;
1.1.1.11 root 2518: }
2519:
2520:
2521: /*-----------------------------------------------------------------------*/
2522: /**
2523: * Copy extended GEM resolution screen
2524: */
1.1.1.9 root 2525: static void Video_CopyVDIScreen(void)
1.1 root 2526: {
1.1.1.11 root 2527: /* Copy whole screen, don't care about being exact as for GEM only */
2528: memcpy(pSTScreen, pVideoRaster, ((VDIWidth*VDIPlanes)/8)*VDIHeight);
1.1 root 2529: }
2530:
1.1.1.2 root 2531:
2532: /*-----------------------------------------------------------------------*/
1.1.1.11 root 2533: /**
2534: * Clear raster line table to store changes in palette/resolution on a line
2535: * basic. Called once on VBL interrupt.
2536: */
1.1 root 2537: void Video_SetScreenRasters(void)
2538: {
1.1.1.11 root 2539: pHBLPaletteMasks = HBLPaletteMasks;
2540: pHBLPalettes = HBLPalettes;
2541: memset(pHBLPaletteMasks, 0, sizeof(Uint32)*NUM_VISIBLE_LINES); /* Clear array */
1.1 root 2542: }
2543:
1.1.1.2 root 2544:
2545: /*-----------------------------------------------------------------------*/
1.1.1.11 root 2546: /**
2547: * Set pointers to HBLPalette tables to store correct colours/resolutions
2548: */
1.1.1.9 root 2549: static void Video_SetHBLPaletteMaskPointers(void)
1.1 root 2550: {
1.1.1.15 root 2551: int FrameCycles, HblCounterVideo, LineCycles;
1.1.1.11 root 2552: int Line;
2553:
2554: /* FIXME [NP] We should use Cycles_GetCounterOnWriteAccess, but it wouldn't */
2555: /* work when using multiple accesses instructions like move.l or movem */
1.1.1.15 root 2556: /* To correct this, we assume a delay of 8 cycles (should give a good approximation */
1.1.1.11 root 2557: /* of a move.w or movem.l for example) */
2558: // FrameCycles = Cycles_GetCounterOnWriteAccess(CYCLES_COUNTER_VIDEO);
2559: FrameCycles = Cycles_GetCounter(CYCLES_COUNTER_VIDEO) + 8;
2560:
2561: /* Find 'line' into palette - screen starts 63 lines down, less 29 for top overscan */
1.1.1.15 root 2562: Video_ConvertPosition ( FrameCycles , &HblCounterVideo , &LineCycles );
2563: Line = HblCounterVideo - nFirstVisibleHbl;
1.1.1.11 root 2564:
2565: /* FIXME [NP] if the color change occurs after the last visible pixel of a line */
2566: /* we consider the palette should be modified on the next line. This is quite */
2567: /* a hack, we should handle all color changes through spec512.c to have cycle */
2568: /* accuracy all the time. */
1.1.1.15 root 2569: if ( LineCycles >= LINE_END_CYCLE_NO_RIGHT )
2570: Line++;
1.1.1.11 root 2571:
2572: if (Line < 0) /* Limit to top/bottom of possible visible screen */
2573: Line = 0;
2574: if (Line >= NUM_VISIBLE_LINES)
2575: Line = NUM_VISIBLE_LINES-1;
2576:
2577: /* Store pointers */
2578: pHBLPaletteMasks = &HBLPaletteMasks[Line]; /* Next mask entry */
2579: pHBLPalettes = &HBLPalettes[16*Line]; /* Next colour raster list x16 colours */
1.1 root 2580: }
1.1.1.8 root 2581:
2582:
1.1.1.9 root 2583: /*-----------------------------------------------------------------------*/
1.1.1.11 root 2584: /**
2585: * Set video shifter timing variables according to screen refresh rate.
2586: * Note: The following equation must be satisfied for correct timings:
2587: *
2588: * nCyclesPerLine * nScanlinesPerFrame * nScreenRefreshRate = 8 MHz
2589: */
1.1.1.10 root 2590: static void Video_ResetShifterTimings(void)
2591: {
1.1.1.11 root 2592: Uint8 nSyncByte;
1.1.1.10 root 2593:
1.1.1.11 root 2594: nSyncByte = IoMem_ReadByte(0xff820a);
1.1.1.10 root 2595:
1.1.1.19 root 2596: if ((IoMem_ReadByte(0xff8260) & 3) == 2)
1.1.1.11 root 2597: {
2598: /* 71 Hz, monochrome */
2599: nScreenRefreshRate = 71;
2600: nScanlinesPerFrame = SCANLINES_PER_FRAME_71HZ;
2601: nCyclesPerLine = CYCLES_PER_LINE_71HZ;
1.1.1.13 root 2602: nStartHBL = VIDEO_START_HBL_71HZ;
1.1.1.11 root 2603: nFirstVisibleHbl = FIRST_VISIBLE_HBL_71HZ;
1.1.1.13 root 2604: nLastVisibleHbl = FIRST_VISIBLE_HBL_71HZ + VIDEO_HEIGHT_HBL_MONO;
1.1.1.11 root 2605: }
2606: else if (nSyncByte & 2) /* Check if running in 50 Hz or in 60 Hz */
2607: {
2608: /* 50 Hz */
2609: nScreenRefreshRate = 50;
2610: nScanlinesPerFrame = SCANLINES_PER_FRAME_50HZ;
2611: nCyclesPerLine = CYCLES_PER_LINE_50HZ;
1.1.1.13 root 2612: nStartHBL = VIDEO_START_HBL_50HZ;
1.1.1.11 root 2613: nFirstVisibleHbl = FIRST_VISIBLE_HBL_50HZ;
1.1.1.13 root 2614: nLastVisibleHbl = FIRST_VISIBLE_HBL_50HZ + NUM_VISIBLE_LINES;
1.1.1.11 root 2615: }
2616: else
2617: {
2618: /* 60 Hz */
2619: nScreenRefreshRate = 60;
2620: nScanlinesPerFrame = SCANLINES_PER_FRAME_60HZ;
2621: nCyclesPerLine = CYCLES_PER_LINE_60HZ;
1.1.1.13 root 2622: nStartHBL = VIDEO_START_HBL_60HZ;
1.1.1.11 root 2623: nFirstVisibleHbl = FIRST_VISIBLE_HBL_60HZ;
1.1.1.13 root 2624: nLastVisibleHbl = FIRST_VISIBLE_HBL_60HZ + NUM_VISIBLE_LINES;
1.1.1.11 root 2625: }
2626:
2627: if (bUseHighRes)
2628: {
1.1.1.13 root 2629: nEndHBL = nStartHBL + VIDEO_HEIGHT_HBL_MONO;
1.1.1.11 root 2630: }
2631: else
2632: {
1.1.1.13 root 2633: nEndHBL = nStartHBL + VIDEO_HEIGHT_HBL_COLOR;
1.1.1.11 root 2634: }
2635:
2636: /* Reset freq changes position for the next VBL to come */
1.1.1.13 root 2637: LastCycleScroll8264 = -1;
2638: LastCycleScroll8265 = -1;
1.1.1.15 root 2639:
2640: TimerBEventCountCycleStart = -1; /* reset timer B activation cycle for this VBL */
2641:
1.1.1.18 root 2642: BlankLines = 0;
1.1.1.11 root 2643: }
1.1.1.10 root 2644:
2645:
1.1.1.11 root 2646: /*-----------------------------------------------------------------------*/
2647: /**
1.1.1.15 root 2648: * Clear the array indicating the state of each video line.
1.1.1.11 root 2649: */
1.1.1.15 root 2650: static void Video_InitShifterLines ( void )
1.1.1.11 root 2651: {
1.1.1.15 root 2652: int i;
2653:
2654: for ( i=0 ; i<MAX_SCANLINES_PER_FRAME ; i++ )
2655: {
2656: ShifterFrame.ShifterLines[i].BorderMask = 0;
2657: ShifterFrame.ShifterLines[i].DisplayPixelShift = 0;
2658: ShifterFrame.ShifterLines[i].DisplayStartCycle = -1;
2659: }
2660:
2661: ShifterFrame.ShifterLines[0].StartCycle = 0; /* 1st HBL starts at cycle 0 */
1.1.1.10 root 2662: }
2663:
2664:
2665: /*-----------------------------------------------------------------------*/
1.1.1.11 root 2666: /**
2667: * Called on VBL, set registers ready for frame
2668: */
1.1.1.9 root 2669: static void Video_ClearOnVBL(void)
2670: {
1.1.1.11 root 2671: /* New screen, so first HBL */
2672: nHBL = 0;
2673: OverscanMode = OVERSCANMODE_NONE;
2674:
2675: Video_ResetShifterTimings();
2676:
2677: /* Get screen address pointer, aligned to 256 bytes on ST (ie ignore lowest byte) */
2678: VideoBase = (Uint32)IoMem_ReadByte(0xff8201)<<16 | (Uint32)IoMem_ReadByte(0xff8203)<<8;
2679: if (ConfigureParams.System.nMachineType != MACHINE_ST)
2680: {
1.1.1.20 root 2681: /* on STe 2 aligned, on TT 8 aligned. We do STe. */
1.1.1.11 root 2682: VideoBase |= IoMem_ReadByte(0xff820d) & ~1;
2683: }
2684: pVideoRaster = &STRam[VideoBase];
2685: pSTScreen = pFrameBuffer->pSTScreen;
2686:
2687: Video_SetScreenRasters();
1.1.1.15 root 2688: Video_InitShifterLines();
1.1.1.11 root 2689: Spec512_StartVBL();
1.1.1.15 root 2690: Video_StartHBL(); /* Init ShifterFrame.ShifterLines[0] */
1.1.1.11 root 2691: }
2692:
2693:
2694: /*-----------------------------------------------------------------------*/
2695: /**
2696: * Get width, height and bpp according to TT-Resolution
2697: */
2698: void Video_GetTTRes(int *width, int *height, int *bpp)
2699: {
2700: switch (TTRes)
2701: {
2702: case ST_LOW_RES: *width = 320; *height = 200; *bpp = 4; break;
2703: case ST_MEDIUM_RES:*width = 640; *height = 200; *bpp = 2; break;
2704: case ST_HIGH_RES: *width = 640; *height = 400; *bpp = 1; break;
2705: case TT_LOW_RES: *width = 320; *height = 480; *bpp = 8; break;
2706: case TT_MEDIUM_RES:*width = 640; *height = 480; *bpp = 4; break;
2707: case TT_HIGH_RES: *width = 1280; *height = 960; *bpp = 1; break;
2708: default:
2709: fprintf(stderr, "TT res error!\n");
2710: *width = 320; *height = 200; *bpp = 4;
2711: break;
2712: }
2713: }
2714:
2715:
2716: /*-----------------------------------------------------------------------*/
2717: /**
2718: * Convert TT palette to SDL palette
2719: */
2720: static void Video_UpdateTTPalette(int bpp)
2721: {
2722: Uint32 ttpalette, src, dst;
2723: Uint8 r,g,b, lowbyte, highbyte;
2724: Uint16 stcolor, ttcolor;
2725: int i, offset, colors;
2726:
2727: ttpalette = 0xff8400;
2728:
2729: if (!bTTColorsSTSync)
2730: {
2731: /* sync TT ST-palette to TT-palette */
2732: src = 0xff8240; /* ST-palette */
2733: offset = (IoMem_ReadWord(0xff8262) & 0x0f);
1.1.1.13 root 2734: /*fprintf(stderr, "offset: %d\n", offset);*/
1.1.1.11 root 2735: dst = ttpalette + offset * 16*SIZE_WORD;
2736:
2737: for (i = 0; i < 16; i++)
2738: {
2739: stcolor = IoMem_ReadWord(src);
1.1.1.21 root 2740: ttcolor = ((stcolor&0x777) << 1) | ((stcolor&0x888) >> 3);
1.1.1.11 root 2741: IoMem_WriteWord(dst, ttcolor);
2742: src += SIZE_WORD;
2743: dst += SIZE_WORD;
2744: }
1.1.1.15 root 2745: bTTColorsSTSync = true;
1.1.1.11 root 2746: }
2747:
2748: colors = 1 << bpp;
1.1.1.21 root 2749: if ((bpp == 1) && (TTRes == TT_HIGH_RES))
1.1.1.11 root 2750: {
2751: /* Monochrome mode... palette is hardwired (?) */
2752: HostScreen_setPaletteColor(0, 255, 255, 255);
2753: HostScreen_setPaletteColor(1, 0, 0, 0);
2754: }
1.1.1.21 root 2755: else if (bpp == 1)
2756: {
2757: /* Monochrome mode... palette is taken from first and last TT color */
2758: ttpalette = 0xff8400;
2759: lowbyte = IoMem_ReadByte(ttpalette++);
2760: highbyte = IoMem_ReadByte(ttpalette++);
2761: r = (lowbyte & 0x0f) << 4;
2762: g = (highbyte & 0xf0);
2763: b = (highbyte & 0x0f) << 4;
2764: //printf("%d: (%d,%d,%d)\n", 0,r,g,b);
2765: if(bTTHypermono)
2766: {
2767: r = g = b = highbyte;
2768: }
2769: HostScreen_setPaletteColor(0, r,g,b);
2770:
2771: ttpalette = 0xff85fe;
2772: lowbyte = IoMem_ReadByte(ttpalette++);
2773: highbyte = IoMem_ReadByte(ttpalette++);
2774: r = (lowbyte & 0x0f) << 4;
2775: g = (highbyte & 0xf0);
2776: b = (highbyte & 0x0f) << 4;
2777: if(bTTHypermono)
2778: {
2779: r = g = b = highbyte;
2780: }
2781: //printf("%d: (%d,%d,%d)\n", 1,r,g,b);
2782: HostScreen_setPaletteColor(1, r,g,b);
2783:
2784: }
1.1.1.11 root 2785: else
2786: {
2787: for (i = 0; i < colors; i++)
2788: {
2789: lowbyte = IoMem_ReadByte(ttpalette++);
2790: highbyte = IoMem_ReadByte(ttpalette++);
2791: r = (lowbyte & 0x0f) << 4;
2792: g = (highbyte & 0xf0);
2793: b = (highbyte & 0x0f) << 4;
2794: //printf("%d: (%d,%d,%d)\n", i,r,g,b);
1.1.1.21 root 2795: if(bTTHypermono)
2796: {
2797: r = g = b = highbyte;
2798: }
1.1.1.11 root 2799: HostScreen_setPaletteColor(i, r,g,b);
2800: }
2801: }
2802:
2803: HostScreen_updatePalette(colors);
1.1.1.15 root 2804: bTTColorsSync = true;
1.1.1.11 root 2805: }
2806:
2807:
2808: /*-----------------------------------------------------------------------*/
2809: /**
1.1.1.13 root 2810: * Update TT palette and blit TT screen using VIDEL code.
2811: * @return true if the screen contents changed
1.1.1.11 root 2812: */
1.1.1.16 root 2813: bool Video_RenderTTScreen(void)
1.1.1.11 root 2814: {
2815: static int nPrevTTRes = -1;
2816: int width, height, bpp;
2817:
2818: Video_GetTTRes(&width, &height, &bpp);
2819: if (TTRes != nPrevTTRes)
2820: {
2821: HostScreen_setWindowSize(width, height, 8);
2822: nPrevTTRes = TTRes;
2823: if (bpp == 1) /* Assert that mono palette will be used in mono mode */
1.1.1.15 root 2824: bTTColorsSync = false;
1.1.1.11 root 2825: }
2826:
2827: /* colors need synching? */
2828: if (!(bTTColorsSync && bTTColorsSTSync))
2829: {
2830: Video_UpdateTTPalette(bpp);
2831: }
1.1.1.21 root 2832: else if (TTSpecialVideoMode != nPrevTTSpecialVideoMode)
2833: {
2834: Video_UpdateTTPalette(bpp);
2835: nPrevTTSpecialVideoMode = TTSpecialVideoMode;
2836: }
1.1.1.11 root 2837:
2838: /* Yes, we are abusing the Videl routines for rendering the TT modes! */
2839: if (!HostScreen_renderBegin())
1.1.1.13 root 2840: return false;
1.1.1.16 root 2841: if (nScreenZoomX * nScreenZoomY != 1)
1.1.1.11 root 2842: VIDEL_ConvertScreenZoom(width, height, bpp, width * bpp / 16);
2843: else
1.1.1.22! root 2844: VIDEL_ConvertScreenNoZoom(width, height, bpp, width * bpp / 16);
1.1.1.13 root 2845:
1.1.1.22! root 2846: HostScreen_update1(HostScreen_renderEnd(), false);
1.1.1.13 root 2847: return true;
1.1.1.11 root 2848: }
2849:
2850:
2851: /*-----------------------------------------------------------------------*/
2852: /**
2853: * Draw screen (either with ST/STE shifter drawing functions or with
2854: * Videl drawing functions)
2855: */
2856: static void Video_DrawScreen(void)
2857: {
2858: /* Skip frame if need to */
1.1.1.13 root 2859: if (nVBLs % (nFrameSkips+1))
1.1.1.11 root 2860: return;
2861:
2862: /* Use extended VDI resolution?
2863: * If so, just copy whole screen on VBL rather than per HBL */
2864: if (bUseVDIRes)
2865: Video_CopyVDIScreen();
2866:
2867: /* Now draw the screen! */
2868: if (ConfigureParams.System.nMachineType == MACHINE_FALCON && !bUseVDIRes)
2869: {
1.1.1.17 root 2870: VIDEL_renderScreen();
1.1.1.11 root 2871: }
2872: else if (ConfigureParams.System.nMachineType == MACHINE_TT && !bUseVDIRes)
2873: {
1.1.1.17 root 2874: Video_RenderTTScreen();
1.1.1.11 root 2875: }
2876: else
1.1.1.13 root 2877: {
2878: /* Before drawing the screen, ensure all unused lines are cleared to color 0 */
2879: /* (this can happen in 60 Hz when hatari is displaying the screen's border) */
2880: /* pSTScreen was set during Video_CopyScreenLineColor */
1.1.1.14 root 2881: if (!bUseVDIRes && nHBL < nLastVisibleHbl)
1.1.1.13 root 2882: memset(pSTScreen, 0, SCREENBYTES_LINE * ( nLastVisibleHbl - nHBL ) );
2883:
1.1.1.17 root 2884: Screen_Draw();
1.1.1.13 root 2885: }
1.1.1.11 root 2886: }
2887:
2888:
2889: /*-----------------------------------------------------------------------*/
2890: /**
1.1.1.15 root 2891: * Start HBL, Timer B and VBL interrupts.
2892: */
2893:
2894:
2895: /**
2896: * Start HBL or Timer B interrupt at position Pos. If position Pos was
2897: * already reached, then the interrupt is set on the next line.
2898: */
2899:
2900: static void Video_AddInterrupt ( int Pos , interrupt_id Handler )
2901: {
2902: int FrameCycles , HblCounterVideo , LineCycles;
2903:
2904: if ( nHBL >= nScanlinesPerFrame )
2905: return; /* don't set a new hbl/timer B if we're on the last line, as the vbl will happen first */
2906:
2907: Video_GetPosition ( &FrameCycles , &HblCounterVideo , &LineCycles );
1.1.1.16 root 2908: //fprintf ( stderr , "add int pos=%d handler=%d LineCycles=%d nCyclesPerLine=%d \n" , Pos , Handler , LineCycles , nCyclesPerLine );
1.1.1.15 root 2909:
2910: if ( LineCycles < Pos ) /* changed before reaching the new Pos on the current line */
1.1.1.16 root 2911: CycInt_AddRelativeInterrupt ( Pos - LineCycles , INT_CPU_CYCLE, Handler );
1.1.1.15 root 2912: else /* Pos will be applied on next line */
1.1.1.16 root 2913: CycInt_AddRelativeInterrupt ( Pos - LineCycles + nCyclesPerLine , INT_CPU_CYCLE, Handler );
1.1.1.15 root 2914: }
2915:
2916:
2917: static void Video_AddInterruptHBL ( int Pos )
2918: {
1.1.1.16 root 2919: //fprintf ( stderr , "add hbl pos=%d\n" , Pos );
1.1.1.15 root 2920: if ( !bUseVDIRes )
2921: Video_AddInterrupt ( Pos , INTERRUPT_VIDEO_HBL );
2922: }
2923:
2924:
2925: void Video_AddInterruptTimerB ( int Pos )
2926: {
1.1.1.16 root 2927: //fprintf ( stderr , "add timerb pos=%d\n" , Pos );
1.1.1.15 root 2928: if ( !bUseVDIRes )
2929: Video_AddInterrupt ( Pos , INTERRUPT_VIDEO_ENDLINE );
2930: }
2931:
2932:
2933: /**
2934: * Add some video interrupts to handle the first HBL and the first Timer B
2935: * in a new VBL. Also add an interrupt to trigger the next VBL.
2936: * This function is called from the VBL, so we use PendingCycleOver to take into account
2937: * the possible delay occurring when the VBL was executed.
1.1.1.16 root 2938: * In monochrome mode (71 Hz) a line is 224 cycles, which means if VBL is delayed
2939: * by a DIVS, FrameCycles can already be > 224 and we need to add an immediate
2940: * interrupt for hbl/timer in the next 4/8 cycles (else crash might happen as
2941: * line 0 processing would be skipped).
1.1.1.11 root 2942: */
1.1.1.15 root 2943: void Video_StartInterrupts ( int PendingCyclesOver )
1.1.1.11 root 2944: {
1.1.1.16 root 2945: int FrameCycles , HblCounterVideo , LineCycles;
2946: int Pos;
2947:
1.1.1.15 root 2948: /* HBL/Timer B are not emulated in VDI mode */
1.1.1.14 root 2949: if (!bUseVDIRes)
2950: {
1.1.1.16 root 2951: Video_GetPosition ( &FrameCycles , &HblCounterVideo , &LineCycles );
1.1.1.15 root 2952:
1.1.1.16 root 2953: /* Set Timer B interrupt for line 0 */
2954: Pos = Video_TimerB_GetPos ( 0 );
2955: if ( Pos > FrameCycles ) /* check Pos for line 0 was not already reached */
2956: Video_AddInterruptTimerB ( Pos );
2957: else /* the VBL was delayed by more than 1 HBL, add an immediate timer B */
2958: {
2959: LOG_TRACE(TRACE_VIDEO_VBL , "VBL %d delayed too much video_cyc=%d >= pos=%d for first timer B, add immediate timer B\n" ,
2960: nVBLs , FrameCycles , Pos );
2961: CycInt_AddRelativeInterrupt ( 4 , INT_CPU_CYCLE, INTERRUPT_VIDEO_ENDLINE );
2962: }
2963:
2964: /* Set HBL interrupt for line 0 */
2965: Pos = Video_HBL_GetPos();
2966: if ( Pos > FrameCycles ) /* check Pos for line 0 was not already reached */
2967: Video_AddInterruptHBL ( Pos );
2968: else /* the VBL was delayed by more than 1 HBL, add an immediate HBL */
2969: {
2970: LOG_TRACE(TRACE_VIDEO_VBL , "VBL %d delayed too much video_cyc=%d >= pos=%d for first HBL, add immediate HBL\n" ,
2971: nVBLs , FrameCycles , Pos );
2972: CycInt_AddRelativeInterrupt ( 8 , INT_CPU_CYCLE, INTERRUPT_VIDEO_HBL ); /* use 8 instead of 4 to happen after immediate timer b */
2973: }
1.1.1.14 root 2974: }
1.1.1.15 root 2975:
2976: /* TODO replace CYCLES_PER_FRAME */
1.1.1.16 root 2977: CyclesPerVBL = CYCLES_PER_FRAME;
1.1.1.18 root 2978: /* Note: Refresh rate less than 50 Hz does not make sense! */
2979: assert(CyclesPerVBL <= CPU_FREQ/49);
2980: /* Add new VBL interrupt: */
1.1.1.16 root 2981: CycInt_AddRelativeInterrupt(CyclesPerVBL - PendingCyclesOver, INT_CPU_CYCLE, INTERRUPT_VIDEO_VBL);
1.1.1.11 root 2982: }
2983:
2984:
2985: /*-----------------------------------------------------------------------*/
2986: /**
1.1.1.15 root 2987: * VBL interrupt : set new interrupts, draw screen, generate sound,
2988: * reset counters, ...
1.1.1.11 root 2989: */
1.1.1.15 root 2990: void Video_InterruptHandler_VBL ( void )
1.1.1.11 root 2991: {
2992: int PendingCyclesOver;
1.1.1.9 root 2993:
1.1.1.21 root 2994: /* Store cycles we went over for this frame(this is our initial count) */
1.1.1.11 root 2995: PendingCyclesOver = -INT_CONVERT_FROM_INTERNAL ( PendingInterruptCount , INT_CPU_CYCLE ); /* +ve */
1.1.1.10 root 2996:
1.1.1.11 root 2997: /* Remove this interrupt from list and re-order */
1.1.1.16 root 2998: CycInt_AcknowledgeInterrupt();
1.1.1.9 root 2999:
1.1.1.14 root 3000: /* Increment the vbl jitter index */
3001: VblJitterIndex++;
1.1.1.20 root 3002: VblJitterIndex %= VBL_JITTER_ARRAY_SIZE;
1.1.1.14 root 3003:
1.1.1.11 root 3004: /* Set frame cycles, used for Video Address */
1.1.1.13 root 3005: Cycles_SetCounter(CYCLES_COUNTER_VIDEO, PendingCyclesOver + VblVideoCycleOffset);
1.1.1.9 root 3006:
1.1.1.11 root 3007: /* Clear any key presses which are due to be de-bounced (held for one ST frame) */
3008: Keymap_DebounceAllKeys();
1.1.1.9 root 3009:
1.1.1.11 root 3010: Video_DrawScreen();
1.1.1.9 root 3011:
1.1.1.11 root 3012: /* Check printer status */
3013: Printer_CheckIdleStatus();
3014:
3015: /* Update counter for number of screen refreshes per second */
3016: nVBLs++;
3017: /* Set video registers for frame */
3018: Video_ClearOnVBL();
1.1.1.15 root 3019:
1.1.1.17 root 3020: /* Videl Vertical counter reset (To be removed when Videl emulation is finished) */
3021: if (ConfigureParams.System.nMachineType == MACHINE_FALCON) {
3022: vfc_counter = 0;
3023: }
3024:
1.1.1.15 root 3025: /* Since we don't execute HBL functions in VDI mode, we've got to
3026: * initialize the first HBL palette here when VDI mode is enabled. */
3027: if (bUseVDIRes)
3028: Video_StoreFirstLinePalette();
3029:
3030: /* Start VBL, HBL and Timer B interrupts (this must be done after resetting
3031: * video cycle counter setting default freq values in Video_ClearOnVBL) */
3032: Video_StartInterrupts(PendingCyclesOver);
3033:
3034: /* Act on shortcut keys */
3035: ShortCut_ActKey();
3036:
1.1.1.21 root 3037: /* Update the IKBD's internal clock */
3038: IKBD_UpdateClockOnVBL ();
3039:
1.1.1.16 root 3040: /* Record video frame is necessary */
3041: if ( bRecordingAvi )
3042: Avi_RecordVideoStream ();
3043:
1.1.1.11 root 3044: /* Store off PSG registers for YM file, is enabled */
3045: YMFormat_UpdateRecording();
3046: /* Generate 1/50th second of sound sample data, to be played by sound thread */
3047: Sound_Update_VBL();
3048:
1.1.1.15 root 3049: LOG_TRACE(TRACE_VIDEO_VBL , "VBL %d video_cyc=%d pending_cyc=%d jitter=%d\n" ,
1.1.1.14 root 3050: nVBLs , Cycles_GetCounter(CYCLES_COUNTER_VIDEO) , PendingCyclesOver , VblJitterArray[ VblJitterIndex ] );
1.1.1.11 root 3051:
1.1.1.21 root 3052: /* Print traces if pending VBL bit changed just before IACK when VBL interrupt is allowed */
3053: if ( ( CPU_IACK == true ) && ( regs.intmask < 4 ) )
3054: {
3055: if ( pendingInterrupts & ( 1 << 4 ) )
3056: {
3057: LOG_TRACE ( TRACE_VIDEO_VBL , "VBL %d, pending set again just before iack, skip one VBL interrupt video_cyc=%d pending_cyc=%d jitter=%d\n" ,
3058: nVBLs , Cycles_GetCounter(CYCLES_COUNTER_VIDEO) , PendingCyclesOver , VblJitterArray[ VblJitterIndex ] );
3059: }
3060: else
3061: {
3062: LOG_TRACE ( TRACE_VIDEO_VBL , "VBL %d, new pending VBL set just before iack video_cyc=%d pending_cyc=%d jitter=%d\n" ,
3063: nVBLs , Cycles_GetCounter(CYCLES_COUNTER_VIDEO) , PendingCyclesOver , VblJitterArray[ VblJitterIndex ] );
3064: }
3065: }
3066:
3067: /* Set pending bit for VBL interrupt in the CPU IPL */
3068: M68000_Exception(EXCEPTION_VBLANK, M68000_EXC_SRC_AUTOVEC); /* Vertical blank interrupt, level 4 */
1.1.1.11 root 3069:
3070: Main_WaitOnVbl();
1.1.1.9 root 3071: }
3072:
3073:
3074: /*-----------------------------------------------------------------------*/
1.1.1.11 root 3075: /**
1.1.1.13 root 3076: * Write to video address base high, med and low register (0xff8201/03/0d).
3077: * On STE, when a program writes to high or med registers, base low register
3078: * is reset to zero.
1.1.1.11 root 3079: */
1.1.1.9 root 3080: void Video_ScreenBaseSTE_WriteByte(void)
3081: {
1.1.1.13 root 3082: if ( ( IoAccessCurrentAddress == 0xff8201 ) || ( IoAccessCurrentAddress == 0xff8203 ) )
3083: IoMem[0xff820d] = 0; /* Reset screen base low register */
1.1.1.8 root 3084:
1.1.1.15 root 3085: if (LOG_TRACE_LEVEL(TRACE_VIDEO_STE))
1.1.1.11 root 3086: {
1.1.1.15 root 3087: int FrameCycles, HblCounterVideo, LineCycles;
3088:
3089: Video_GetPosition_OnWriteAccess ( &FrameCycles , &HblCounterVideo , &LineCycles );
3090:
3091: LOG_TRACE_PRINT ( "write ste video base=0x%x video_cyc_w=%d line_cyc_w=%d @ nHBL=%d/video_hbl_w=%d pc=%x instr_cyc=%d\n" ,
1.1.1.13 root 3092: (IoMem[0xff8201]<<16)+(IoMem[0xff8203]<<8)+IoMem[0xff820d] ,
1.1.1.15 root 3093: FrameCycles, LineCycles, nHBL, HblCounterVideo, M68000_GetPC(), CurrentInstrCycles );
1.1.1.11 root 3094: }
1.1.1.8 root 3095: }
3096:
3097: /*-----------------------------------------------------------------------*/
1.1.1.11 root 3098: /**
3099: * Read video address counter and update ff8205/07/09
3100: */
3101: void Video_ScreenCounter_ReadByte(void)
1.1.1.8 root 3102: {
1.1.1.11 root 3103: Uint32 addr;
1.1.1.8 root 3104:
1.1.1.11 root 3105: addr = Video_CalculateAddress(); /* get current video address */
3106: IoMem[0xff8205] = ( addr >> 16 ) & 0xff;
3107: IoMem[0xff8207] = ( addr >> 8 ) & 0xff;
3108: IoMem[0xff8209] = addr & 0xff;
1.1.1.8 root 3109: }
3110:
1.1.1.9 root 3111: /*-----------------------------------------------------------------------*/
1.1.1.11 root 3112: /**
3113: * Write to video address counter (0xff8205, 0xff8207 and 0xff8209).
3114: * Called on STE only and like with base address, you cannot set lowest bit.
1.1.1.16 root 3115: *
3116: * As Hatari processes/converts one complete video line at a time, we have 3 cases :
3117: * - If display has not started yet for this line (left border), we can change pVideoRaster now.
3118: * We must take into account that the MMU starts 16 cycles earlier when hscroll is used.
3119: * - If display has stopped for this line (right border), we will change pVideoRaster
3120: * in Video_CopyScreenLineColor using pVideoRasterDelayed once the line has been processed.
3121: * - If the write is made while display is on, then we must compute an offset of what
3122: * the new address should have been, to correctly emulate the video address at the
3123: * end of the line while taking into account the fact that the video pointer is incrementing
3124: * during the active part of the line (this is the most "tricky" case)
3125: *
3126: * To compute the new address, we must change only the byte that was modified and keep the two others ones.
1.1.1.11 root 3127: */
1.1.1.9 root 3128: void Video_ScreenCounter_WriteByte(void)
3129: {
1.1.1.11 root 3130: Uint8 AddrByte;
1.1.1.16 root 3131: Uint32 addr_cur;
3132: Uint32 addr_new = 0;
1.1.1.15 root 3133: int FrameCycles, HblCounterVideo, LineCycles;
1.1.1.13 root 3134: int Delayed;
1.1.1.16 root 3135: int MMUStartCycle;
1.1.1.11 root 3136:
1.1.1.15 root 3137: Video_GetPosition_OnWriteAccess ( &FrameCycles , &HblCounterVideo , &LineCycles );
1.1.1.11 root 3138:
3139: AddrByte = IoMem[ IoAccessCurrentAddress ];
3140:
1.1.1.16 root 3141: /* Get current video address from the shifter */
3142: addr_cur = Video_CalculateAddress();
3143: /* Correct the address in case a modification of ff8205/07/09 was already delayed */
3144: addr_new = addr_cur + VideoCounterDelayedOffset;
3145: /* Correct the address in case video counter was already modified in the right border */
3146: if ( pVideoRasterDelayed != NULL )
3147: addr_new = pVideoRasterDelayed - STRam;
3148:
3149: /* addr_new should now be the same as on a real STE */
3150: /* Compute the new video address with one modified byte */
3151: if ( IoAccessCurrentAddress == 0xff8205 )
1.1.1.20 root 3152: addr_new = ( addr_new & 0x00ffff ) | ( ( AddrByte & 0x3f ) << 16 );
1.1.1.16 root 3153: else if ( IoAccessCurrentAddress == 0xff8207 )
3154: addr_new = ( addr_new & 0xff00ff ) | ( AddrByte << 8 );
3155: else if ( IoAccessCurrentAddress == 0xff8209 )
3156: addr_new = ( addr_new & 0xffff00 ) | ( AddrByte );
3157:
3158: MMUStartCycle = Video_GetMMUStartCycle ( ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle );
3159:
1.1.1.11 root 3160: /* If display has not started, we can still modify pVideoRaster */
1.1.1.16 root 3161: /* We must also check the write does not overlap the end of the line (to be sure Video_EndHBL is called first) */
3162: if ( ( ( LineCycles <= MMUStartCycle ) && ( nHBL == HblCounterVideo ) )
1.1.1.18 root 3163: || ( nHBL < nStartHBL ) || ( nHBL >= nEndHBL + BlankLines ) )
1.1.1.11 root 3164: {
1.1.1.16 root 3165: pVideoRaster = &STRam[addr_new & ~1]; /* set new video address */
3166: VideoCounterDelayedOffset = 0;
3167: pVideoRasterDelayed = NULL;
1.1.1.15 root 3168: Delayed = false;
1.1.1.11 root 3169: }
3170:
1.1.1.16 root 3171: /* Display is OFF (right border) but we can't change pVideoRaster now, we must process Video_CopyScreenLineColor first */
1.1.1.18 root 3172: else if ( ( nHBL >= nStartHBL ) && ( nHBL < nEndHBL + BlankLines ) /* line should be active */
1.1.1.16 root 3173: && ( ( LineCycles > ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle ) /* we're in the right border */
3174: || ( HblCounterVideo == nHBL+1 ) ) ) /* or the write overlaps the next line and Video_EndHBL was not called yet */
3175: {
3176: VideoCounterDelayedOffset = 0;
3177: pVideoRasterDelayed = &STRam[addr_new & ~1]; /* new value for pVideoRaster at the end of Video_CopyScreenLineColor */
3178: Delayed = true;
3179: }
3180:
3181: /* Counter is modified while display is ON, store the bytes offset for Video_CopyScreenLineColor */
3182: /* Even on a real STE, modifying video address in this case will cause artefacts */
1.1.1.11 root 3183: else
3184: {
1.1.1.16 root 3185: VideoCounterDelayedOffset = addr_new - addr_cur;
3186: pVideoRasterDelayed = NULL;
1.1.1.15 root 3187: Delayed = true;
1.1.1.11 root 3188: }
3189:
1.1.1.16 root 3190: LOG_TRACE(TRACE_VIDEO_STE , "write ste video %x val=0x%x video_old=%x video_new=%x offset=%x delayed=%s"
3191: " video_cyc_w=%d line_cyc_w=%d @ nHBL=%d/video_hbl_w=%d pc=%x instr_cyc=%d\n" ,
3192: IoAccessCurrentAddress, AddrByte, addr_cur , addr_new , VideoCounterDelayedOffset , Delayed ? "yes" : "no" ,
1.1.1.15 root 3193: FrameCycles, LineCycles, nHBL, HblCounterVideo, M68000_GetPC(), CurrentInstrCycles );
1.1.1.9 root 3194: }
1.1.1.8 root 3195:
3196: /*-----------------------------------------------------------------------*/
1.1.1.11 root 3197: /**
3198: * Read video sync register (0xff820a)
3199: */
1.1.1.8 root 3200: void Video_Sync_ReadByte(void)
3201: {
1.1.1.17 root 3202: if ( (ConfigureParams.System.nMachineType == MACHINE_ST)
3203: || (ConfigureParams.System.nMachineType == MACHINE_STE)
3204: || (ConfigureParams.System.nMachineType == MACHINE_MEGA_STE) )
1.1.1.14 root 3205: IoMem[0xff820a] |= 0xfc; /* set unused bits 2-7 to 1 */
1.1.1.8 root 3206: }
3207:
3208: /*-----------------------------------------------------------------------*/
1.1.1.11 root 3209: /**
3210: * Read video base address low byte (0xff820d). A plain ST can only store
3211: * screen addresses rounded to 256 bytes (i.e. no lower byte).
3212: */
1.1.1.8 root 3213: void Video_BaseLow_ReadByte(void)
3214: {
1.1.1.11 root 3215: if (ConfigureParams.System.nMachineType == MACHINE_ST)
3216: IoMem[0xff820d] = 0; /* On ST this is always 0 */
1.1.1.9 root 3217:
1.1.1.11 root 3218: /* Note that you should not do anything here for STe because
3219: * VideoBase address is set in an interrupt and would be wrong
3220: * here. It's fine like this.
3221: */
1.1.1.8 root 3222: }
3223:
3224: /*-----------------------------------------------------------------------*/
1.1.1.11 root 3225: /**
3226: * Read video line width register (0xff820f)
3227: */
1.1.1.8 root 3228: void Video_LineWidth_ReadByte(void)
3229: {
1.1.1.11 root 3230: if (ConfigureParams.System.nMachineType == MACHINE_ST)
3231: IoMem[0xff820f] = 0; /* On ST this is always 0 */
1.1.1.18 root 3232:
3233: /* If we're not in STF mode, we use the value already stored in $ff820f */
1.1.1.8 root 3234: }
3235:
3236: /*-----------------------------------------------------------------------*/
1.1.1.11 root 3237: /**
3238: * Read video shifter mode register (0xff8260)
3239: */
1.1.1.8 root 3240: void Video_ShifterMode_ReadByte(void)
3241: {
1.1.1.11 root 3242: if (bUseHighRes)
1.1.1.14 root 3243: IoMem[0xff8260] = 2; /* If mono monitor, force to high resolution */
3244:
1.1.1.17 root 3245: if (ConfigureParams.System.nMachineType == MACHINE_ST)
3246: IoMem[0xff8260] |= 0xfc; /* On STF, set unused bits 2-7 to 1 */
1.1.1.20 root 3247: else
3248: IoMem[0xff8260] &= 0x03; /* Only use bits 0 and 1, unused bits 2-7 are set to 0 */
1.1.1.8 root 3249: }
3250:
1.1.1.10 root 3251: /*-----------------------------------------------------------------------*/
1.1.1.11 root 3252: /**
3253: * Read horizontal scroll register (0xff8265)
3254: */
1.1.1.10 root 3255: void Video_HorScroll_Read(void)
3256: {
1.1.1.11 root 3257: IoMem[0xff8265] = HWScrollCount;
1.1.1.10 root 3258: }
1.1.1.8 root 3259:
3260: /*-----------------------------------------------------------------------*/
1.1.1.11 root 3261: /**
3262: * Write video line width register (0xff820f) - STE only.
3263: * Content of LineWidth is added to the shifter counter when display is
3264: * turned off (start of the right border, usually at cycle 376)
3265: */
1.1.1.10 root 3266: void Video_LineWidth_WriteByte(void)
3267: {
1.1.1.11 root 3268: Uint8 NewWidth;
1.1.1.15 root 3269: int FrameCycles, HblCounterVideo, LineCycles;
1.1.1.13 root 3270: int Delayed;
1.1.1.11 root 3271:
1.1.1.15 root 3272: Video_GetPosition_OnWriteAccess ( &FrameCycles , &HblCounterVideo , &LineCycles );
1.1.1.11 root 3273:
3274: NewWidth = IoMem_ReadByte(0xff820f);
3275:
3276: /* We must also check the write does not overlap the end of the line */
1.1.1.15 root 3277: if ( ( ( nHBL == HblCounterVideo ) && ( LineCycles <= ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle ) )
1.1.1.18 root 3278: || ( nHBL < nStartHBL ) || ( nHBL >= nEndHBL + BlankLines ) )
1.1.1.13 root 3279: {
1.1.1.11 root 3280: LineWidth = NewWidth; /* display is on, we can still change */
1.1.1.13 root 3281: NewLineWidth = -1; /* cancel 'pending' change */
1.1.1.15 root 3282: Delayed = false;
1.1.1.13 root 3283: }
1.1.1.11 root 3284: else
1.1.1.13 root 3285: {
1.1.1.11 root 3286: NewLineWidth = NewWidth; /* display is off, can't change LineWidth once in right border */
1.1.1.15 root 3287: Delayed = true;
1.1.1.13 root 3288: }
1.1.1.11 root 3289:
1.1.1.15 root 3290: LOG_TRACE(TRACE_VIDEO_STE , "write ste linewidth=0x%x delayed=%s video_cyc_w=%d line_cyc_w=%d @ nHBL=%d/video_hbl_w=%d pc=%x instr_cyc=%d\n",
1.1.1.13 root 3291: NewWidth, Delayed ? "yes" : "no" ,
1.1.1.15 root 3292: FrameCycles, LineCycles, nHBL, HblCounterVideo, M68000_GetPC(), CurrentInstrCycles );
1.1.1.10 root 3293: }
3294:
3295: /*-----------------------------------------------------------------------*/
1.1.1.11 root 3296: /**
3297: * Write to video shifter palette registers (0xff8240-0xff825e)
1.1.1.14 root 3298: *
3299: * Note that there's a special "strange" case when writing only to the upper byte
3300: * of the color reg (instead of writing 16 bits at once with .W/.L).
3301: * In that case, the byte written to address x is automatically written
3302: * to address x+1 too (but we shouldn't copy x in x+1 after masking x ; we apply the mask at the end)
1.1.1.22! root 3303: * Similarly, when writing a byte to address x+1, it's also written to address x
1.1.1.14 root 3304: * So : move.w #0,$ff8240 -> color 0 is now $000
3305: * move.b #7,$ff8240 -> color 0 is now $707 !
1.1.1.22! root 3306: * move.b #$55,$ff8241 -> color 0 is now $555 !
1.1.1.14 root 3307: * move.b #$71,$ff8240 -> color 0 is now $171 (bytes are first copied, then masked)
1.1.1.11 root 3308: */
1.1.1.22! root 3309: void Video_ColorReg_WriteWord(void)
1.1.1.8 root 3310: {
1.1.1.15 root 3311: if (!bUseHighRes && !bUseVDIRes) /* Don't store if hi-res or VDI resolution */
1.1.1.11 root 3312: {
3313: int idx;
3314: Uint16 col;
1.1.1.22! root 3315: Uint32 addr;
! 3316: addr = IoAccessCurrentAddress;
! 3317:
1.1.1.11 root 3318: Video_SetHBLPaletteMaskPointers(); /* Set 'pHBLPalettes' etc.. according cycles into frame */
1.1.1.14 root 3319:
3320: /* Handle special case when writing only to the upper byte of the color reg */
3321: if ( ( nIoMemAccessSize == SIZE_BYTE ) && ( ( IoAccessCurrentAddress & 1 ) == 0 ) )
3322: col = ( IoMem_ReadByte(addr) << 8 ) + IoMem_ReadByte(addr); /* copy upper byte into lower byte */
1.1.1.22! root 3323: /* Same when writing only to the lower byte of the color reg */
! 3324: else if ( ( nIoMemAccessSize == SIZE_BYTE ) && ( ( IoAccessCurrentAddress & 1 ) == 1 ) )
! 3325: col = ( IoMem_ReadByte(addr) << 8 ) + IoMem_ReadByte(addr); /* copy lower byte into upper byte */
! 3326: /* Usual case, writing a word or a long (2 words) */
! 3327: else
! 3328: col = IoMem_ReadWord(addr);
1.1.1.14 root 3329:
1.1.1.11 root 3330: if (ConfigureParams.System.nMachineType == MACHINE_ST)
1.1.1.22! root 3331: col &= 0x777; /* Mask off to ST 512 palette */
1.1.1.11 root 3332: else
1.1.1.22! root 3333: col &= 0xfff; /* Mask off to STe 4096 palette */
! 3334:
! 3335: addr &= 0xfffffffe; /* Ensure addr is even to store the 16 bit color */
! 3336:
1.1.1.11 root 3337: IoMem_WriteWord(addr, col); /* (some games write 0xFFFF and read back to see if STe) */
3338: Spec512_StoreCyclePalette(col, addr); /* Store colour into CyclePalettes[] */
3339: idx = (addr-0xff8240)/2; /* words */
3340: pHBLPalettes[idx] = col; /* Set colour x */
3341: *pHBLPaletteMasks |= 1 << idx; /* And mask */
3342:
1.1.1.15 root 3343: if (LOG_TRACE_LEVEL(TRACE_VIDEO_COLOR))
1.1.1.11 root 3344: {
1.1.1.15 root 3345: int FrameCycles, HblCounterVideo, LineCycles;
3346:
3347: Video_GetPosition_OnWriteAccess ( &FrameCycles , &HblCounterVideo , &LineCycles );
3348:
3349: LOG_TRACE_PRINT ( "write col addr=%x col=%x video_cyc_w=%d line_cyc_w=%d @ nHBL=%d/video_hbl_w=%d pc=%x instr_cyc=%d\n" ,
1.1.1.22! root 3350: IoAccessCurrentAddress, col,
1.1.1.15 root 3351: FrameCycles, LineCycles, nHBL, HblCounterVideo, M68000_GetPC(), CurrentInstrCycles );
1.1.1.11 root 3352: }
3353:
3354: }
1.1.1.8 root 3355: }
3356:
1.1.1.22! root 3357: /*
! 3358: * Read from video shifter palette registers (0xff8240-0xff825e)
! 3359: *
! 3360: * NOTE [NP] : On STF, only 3 bits are used for RGB (instead of 4 on STE) ;
! 3361: * the content of bits 3, 7 and 11 is not defined and will be 0 or 1
! 3362: * depending on the latest activity on the BUS (last word access by the CPU or
! 3363: * the shifter). As precisely emulating these bits is quite complicated,
! 3364: * we use random values for now.
! 3365: * NOTE [NP] : When executing code from the IO addresses between 0xff8240-0xff825e
! 3366: * the unused bits on STF are set to '0' (used in "The Union Demo" protection).
! 3367: * So we use rand() only if PC is located in RAM.
! 3368: */
! 3369: void Video_ColorReg_ReadWord(void)
! 3370: {
! 3371: Uint16 col;
! 3372: Uint32 addr;
! 3373: addr = IoAccessCurrentAddress;
! 3374:
! 3375: col = IoMem_ReadWord(addr);
! 3376:
! 3377: if ( (ConfigureParams.System.nMachineType == MACHINE_ST)
! 3378: && ( M68000_GetPC() < 0x400000 ) ) /* PC in RAM < 4MB */
! 3379: {
! 3380: col = ( col & 0x777 ) | ( rand() & 0x888 );
! 3381: IoMem_WriteWord ( addr , col );
! 3382: }
! 3383:
! 3384: if (LOG_TRACE_LEVEL(TRACE_VIDEO_COLOR))
! 3385: {
! 3386: int FrameCycles, HblCounterVideo, LineCycles;
! 3387:
! 3388: Video_GetPosition_OnReadAccess ( &FrameCycles , &HblCounterVideo , &LineCycles );
! 3389:
! 3390: LOG_TRACE_PRINT ( "read col addr=%x col=%x video_cyc_w=%d line_cyc_w=%d @ nHBL=%d/video_hbl_w=%d pc=%x instr_cyc=%d\n" ,
! 3391: IoAccessCurrentAddress, col,
! 3392: FrameCycles, LineCycles, nHBL, HblCounterVideo, M68000_GetPC(), CurrentInstrCycles );
! 3393: }
! 3394: }
! 3395:
! 3396: /*
! 3397: * [NP] TODO : due to how .L accesses are handled in ioMem.c, we can't call directly
! 3398: * Video_ColorReg_WriteWord from ioMemTabST.c / ioMemTabSTE.c, we must use an intermediate
! 3399: * function, else .L accesses will not change 2 .W color regs, but only one.
! 3400: * This should be changed in ioMem.c to do 2 separate .W accesses, as would do a real 68000
! 3401: */
! 3402:
1.1.1.8 root 3403: void Video_Color0_WriteWord(void)
3404: {
1.1.1.22! root 3405: Video_ColorReg_WriteWord();
1.1.1.8 root 3406: }
3407:
3408: void Video_Color1_WriteWord(void)
3409: {
1.1.1.22! root 3410: Video_ColorReg_WriteWord();
1.1.1.8 root 3411: }
3412:
3413: void Video_Color2_WriteWord(void)
3414: {
1.1.1.22! root 3415: Video_ColorReg_WriteWord();
1.1.1.8 root 3416: }
3417:
3418: void Video_Color3_WriteWord(void)
3419: {
1.1.1.22! root 3420: Video_ColorReg_WriteWord();
1.1.1.8 root 3421: }
3422:
3423: void Video_Color4_WriteWord(void)
3424: {
1.1.1.22! root 3425: Video_ColorReg_WriteWord();
1.1.1.8 root 3426: }
3427:
3428: void Video_Color5_WriteWord(void)
3429: {
1.1.1.22! root 3430: Video_ColorReg_WriteWord();
1.1.1.8 root 3431: }
3432:
3433: void Video_Color6_WriteWord(void)
3434: {
1.1.1.22! root 3435: Video_ColorReg_WriteWord();
1.1.1.8 root 3436: }
3437:
3438: void Video_Color7_WriteWord(void)
3439: {
1.1.1.22! root 3440: Video_ColorReg_WriteWord();
1.1.1.8 root 3441: }
3442:
3443: void Video_Color8_WriteWord(void)
3444: {
1.1.1.22! root 3445: Video_ColorReg_WriteWord();
1.1.1.8 root 3446: }
3447:
3448: void Video_Color9_WriteWord(void)
3449: {
1.1.1.22! root 3450: Video_ColorReg_WriteWord();
1.1.1.8 root 3451: }
3452:
3453: void Video_Color10_WriteWord(void)
3454: {
1.1.1.22! root 3455: Video_ColorReg_WriteWord();
1.1.1.8 root 3456: }
3457:
3458: void Video_Color11_WriteWord(void)
3459: {
1.1.1.22! root 3460: Video_ColorReg_WriteWord();
1.1.1.8 root 3461: }
3462:
3463: void Video_Color12_WriteWord(void)
3464: {
1.1.1.22! root 3465: Video_ColorReg_WriteWord();
1.1.1.8 root 3466: }
3467:
3468: void Video_Color13_WriteWord(void)
3469: {
1.1.1.22! root 3470: Video_ColorReg_WriteWord();
1.1.1.8 root 3471: }
3472:
3473: void Video_Color14_WriteWord(void)
3474: {
1.1.1.22! root 3475: Video_ColorReg_WriteWord();
1.1.1.8 root 3476: }
3477:
3478: void Video_Color15_WriteWord(void)
3479: {
1.1.1.22! root 3480: Video_ColorReg_WriteWord();
! 3481: }
! 3482:
! 3483:
! 3484: void Video_Color0_ReadWord(void)
! 3485: {
! 3486: Video_ColorReg_ReadWord();
! 3487: }
! 3488:
! 3489: void Video_Color1_ReadWord(void)
! 3490: {
! 3491: Video_ColorReg_ReadWord();
! 3492: }
! 3493:
! 3494: void Video_Color2_ReadWord(void)
! 3495: {
! 3496: Video_ColorReg_ReadWord();
! 3497: }
! 3498:
! 3499: void Video_Color3_ReadWord(void)
! 3500: {
! 3501: Video_ColorReg_ReadWord();
! 3502: }
! 3503:
! 3504: void Video_Color4_ReadWord(void)
! 3505: {
! 3506: Video_ColorReg_ReadWord();
! 3507: }
! 3508:
! 3509: void Video_Color5_ReadWord(void)
! 3510: {
! 3511: Video_ColorReg_ReadWord();
! 3512: }
! 3513:
! 3514: void Video_Color6_ReadWord(void)
! 3515: {
! 3516: Video_ColorReg_ReadWord();
! 3517: }
! 3518:
! 3519: void Video_Color7_ReadWord(void)
! 3520: {
! 3521: Video_ColorReg_ReadWord();
! 3522: }
! 3523:
! 3524: void Video_Color8_ReadWord(void)
! 3525: {
! 3526: Video_ColorReg_ReadWord();
! 3527: }
! 3528:
! 3529: void Video_Color9_ReadWord(void)
! 3530: {
! 3531: Video_ColorReg_ReadWord();
! 3532: }
! 3533:
! 3534: void Video_Color10_ReadWord(void)
! 3535: {
! 3536: Video_ColorReg_ReadWord();
! 3537: }
! 3538:
! 3539: void Video_Color11_ReadWord(void)
! 3540: {
! 3541: Video_ColorReg_ReadWord();
! 3542: }
! 3543:
! 3544: void Video_Color12_ReadWord(void)
! 3545: {
! 3546: Video_ColorReg_ReadWord();
! 3547: }
! 3548:
! 3549: void Video_Color13_ReadWord(void)
! 3550: {
! 3551: Video_ColorReg_ReadWord();
! 3552: }
! 3553:
! 3554: void Video_Color14_ReadWord(void)
! 3555: {
! 3556: Video_ColorReg_ReadWord();
! 3557: }
! 3558:
! 3559: void Video_Color15_ReadWord(void)
! 3560: {
! 3561: Video_ColorReg_ReadWord();
1.1.1.8 root 3562: }
3563:
3564:
3565: /*-----------------------------------------------------------------------*/
1.1.1.11 root 3566: /**
3567: * Write video shifter mode register (0xff8260)
3568: */
1.1.1.8 root 3569: void Video_ShifterMode_WriteByte(void)
3570: {
1.1.1.20 root 3571: Uint8 VideoShifterByte;
3572:
3573: if (ConfigureParams.System.nMachineType == MACHINE_TT)
3574: {
3575: TTRes = IoMem_ReadByte(0xff8260) & 7;
3576: /* Copy to TT shifter mode register: */
3577: IoMem_WriteByte(0xff8262, TTRes);
1.1.1.21 root 3578:
3579: bTTSampleHold = false;
3580: bTTHypermono = false;
1.1.1.20 root 3581: }
3582: else if (!bUseVDIRes) /* ST and STE mode */
1.1.1.11 root 3583: {
1.1.1.18 root 3584: /* We only care for lower 2-bits */
3585: VideoShifterByte = IoMem[0xff8260] & 3;
1.1.1.22! root 3586: /* 3 is not a valid resolution, use high res instead */
1.1.1.18 root 3587: if ( VideoShifterByte == 3 )
1.1.1.13 root 3588: {
1.1.1.22! root 3589: VideoShifterByte = 2;
! 3590: IoMem_WriteByte(0xff8260,2);
1.1.1.13 root 3591: }
1.1.1.18 root 3592:
1.1.1.11 root 3593: Video_WriteToShifter(VideoShifterByte);
3594: Video_SetHBLPaletteMaskPointers();
3595: *pHBLPaletteMasks &= 0xff00ffff;
3596: /* Store resolution after palette mask and set resolution write bit: */
3597: *pHBLPaletteMasks |= (((Uint32)VideoShifterByte|0x04)<<16);
3598: }
1.1.1.10 root 3599: }
3600:
3601: /*-----------------------------------------------------------------------*/
1.1.1.11 root 3602: /**
1.1.1.13 root 3603: * Handle horizontal scrolling to the left.
3604: * On STE, there're 2 registers that can scroll the line :
3605: * - $ff8264 : scroll without prefetch
1.1.1.14 root 3606: * - $ff8265 : scroll with prefetch
1.1.1.13 root 3607: * Both registers will scroll the line to the left by skipping the amount
3608: * of pixels in $ff8264 or $ff8265 (from 0 to 15).
3609: * As some pixels will be skipped, this means the shifter needs to read
3610: * 16 other pixels in advance in some internal registers to have an uninterrupted flow of pixels.
3611: *
1.1.1.14 root 3612: * These 16 pixels can be prefetched before the display starts (on cycle 56 for example) when using
1.1.1.13 root 3613: * $ff8265 to scroll the line. In that case 8 more bytes per line (low res) will be read. Most programs
3614: * are using $ff8265 to scroll the line.
3615: *
3616: * When using $ff8264, the next 16 pixels will not be prefetched before the display
3617: * starts, they will be read when the display normally starts (cycle 56). While
3618: * reading these 16 pixels, the shifter won't be able to display anything, which will
3619: * result in 16 pixels having the color 0. So, reading the 16 pixels will in fact delay
3620: * the real start of the line, which will look as if it started 16 pixels later. As the
3621: * shifter will stop the display at cycle 56+320 anyway, this means the last 16 pixels
3622: * of each line won't be displayed and you get the equivalent of a shorter 304 pixels line.
3623: * As a consequence, this register is rarely used to scroll the line.
3624: *
1.1.1.21 root 3625: * By writing a value > 0 in $ff8265 (to start prefetching) and immediately after a value of 0
1.1.1.13 root 3626: * in $ff8264 (no scroll and no prefetch), it's possible to fill the internal registers used
3627: * for the scrolling even if scrolling is set to 0. In that case, the shifter will start displaying
3628: * each line 16 pixels earlier (as the data are already available in the internal registers).
3629: * This allows to have 336 pixels per line (instead of 320) for all the remaining lines on the screen.
3630: *
3631: * Although some programs are using this sequence :
3632: * move.w #1,$ffff8264 ; Word access!
3633: * clr.b $ffff8264 ; Byte access!
3634: * It is also possible to add 16 pixels by doing :
3635: * move.b #X,$ff8265 ; with X > 0
3636: * move.b #0,$ff8264
1.1.1.11 root 3637: * Some games (Obsession, Skulls) and demos (Pacemaker by Paradox) use this
3638: * feature to increase the resolution, so we have to emulate this bug, too!
1.1.1.13 root 3639: *
3640: * So considering a low res line of 320 pixels (160 bytes) :
3641: * - if both $ff8264/65 are 0, no scrolling happens, the shifter reads 160 bytes and displays 320 pixels (same as STF)
3642: * - if $ff8265 > 0, line is scrolled, the shifter reads 168 bytes and displays 320 pixels.
3643: * - if $ff8264 > 0, line is scrolled, the shifter reads 160 bytes and displays 304 pixels,
3644: * the display starts 16 pixels later.
3645: * - if $ff8265 > 0 and then $ff8264 = 0, there's no scrolling, the shifter reads 168 bytes and displays 336 pixels,
3646: * the display starts 16 pixels earlier.
1.1.1.11 root 3647: */
1.1.1.13 root 3648:
3649: void Video_HorScroll_Write_8264(void)
3650: {
3651: Video_HorScroll_Write();
3652: }
3653:
3654: void Video_HorScroll_Write_8265(void)
3655: {
3656: Video_HorScroll_Write();
3657: }
3658:
1.1.1.10 root 3659: void Video_HorScroll_Write(void)
3660: {
1.1.1.13 root 3661: Uint32 RegAddr;
1.1.1.11 root 3662: Uint8 ScrollCount;
1.1.1.13 root 3663: Uint8 Prefetch;
1.1.1.15 root 3664: int FrameCycles, HblCounterVideo, LineCycles;
3665: bool Add16px = false;
1.1.1.13 root 3666: static Uint8 LastVal8265 = 0;
3667: int Delayed;
3668:
1.1.1.15 root 3669: Video_GetPosition_OnWriteAccess ( &FrameCycles , &HblCounterVideo , &LineCycles );
1.1.1.10 root 3670:
1.1.1.13 root 3671: RegAddr = IoAccessCurrentAddress; /* 0xff8264 or 0xff8265 */
3672: ScrollCount = IoMem[ RegAddr ];
1.1.1.11 root 3673: ScrollCount &= 0x0f;
1.1.1.10 root 3674:
1.1.1.13 root 3675: if ( RegAddr == 0xff8264 )
3676: {
3677: Prefetch = 0; /* scroll without prefetch */
1.1.1.15 root 3678: LastCycleScroll8264 = FrameCycles;
1.1.1.11 root 3679:
1.1.1.15 root 3680: ShifterFrame.Scroll8264Pos.VBL = nVBLs;
3681: ShifterFrame.Scroll8264Pos.FrameCycles = FrameCycles;
3682: ShifterFrame.Scroll8264Pos.HBL = HblCounterVideo;
3683: ShifterFrame.Scroll8264Pos.LineCycles = LineCycles;
3684:
3685: if ( ( ScrollCount == 0 ) && ( LastVal8265 > 0 )
3686: && ( ShifterFrame.Scroll8265Pos.VBL > 0 ) /* a write to ff8265 has been made */
3687: && ( ShifterFrame.Scroll8265Pos.VBL == ShifterFrame.Scroll8264Pos.VBL ) /* during the same VBL */
3688: && ( ShifterFrame.Scroll8264Pos.FrameCycles - ShifterFrame.Scroll8265Pos.FrameCycles <= 40 ) )
1.1.1.13 root 3689: {
1.1.1.15 root 3690: LOG_TRACE(TRACE_VIDEO_BORDER_H , "detect ste left+16 pixels\n" );
3691: Add16px = true;
1.1.1.13 root 3692: }
3693: }
3694: else
1.1.1.11 root 3695: {
1.1.1.13 root 3696: Prefetch = 1; /* scroll with prefetch */
1.1.1.15 root 3697: LastCycleScroll8265 = FrameCycles;
3698:
3699: ShifterFrame.Scroll8265Pos.VBL = nVBLs;
3700: ShifterFrame.Scroll8265Pos.FrameCycles = FrameCycles;
3701: ShifterFrame.Scroll8265Pos.HBL = HblCounterVideo;
3702: ShifterFrame.Scroll8265Pos.LineCycles = LineCycles;
3703:
1.1.1.13 root 3704: LastVal8265 = ScrollCount;
1.1.1.15 root 3705: Add16px = false;
1.1.1.11 root 3706: }
1.1.1.13 root 3707:
3708:
3709: /* If the write was made before display starts on the current line, then */
3710: /* we can still change the value now. Else, the new values will be used */
3711: /* for line n+1. */
3712: /* We must also check the write does not overlap the end of the line */
1.1.1.15 root 3713: if ( ( ( LineCycles <= LINE_START_CYCLE_50 ) && ( nHBL == HblCounterVideo ) )
1.1.1.18 root 3714: || ( nHBL < nStartHBL ) || ( nHBL >= nEndHBL + BlankLines ) )
1.1.1.11 root 3715: {
1.1.1.13 root 3716: HWScrollCount = ScrollCount; /* display has not started, we can still change */
3717: HWScrollPrefetch = Prefetch;
3718: bSteBorderFlag = Add16px;
3719: NewHWScrollCount = -1; /* cancel 'pending' change */
1.1.1.15 root 3720: Delayed = false;
1.1.1.11 root 3721: }
3722: else
3723: {
1.1.1.13 root 3724: NewHWScrollCount = ScrollCount; /* display has started, can't change HWScrollCount now */
3725: NewHWScrollPrefetch = Prefetch;
3726: if ( Add16px )
3727: NewSteBorderFlag = 1;
3728: else
3729: NewSteBorderFlag = 0;
1.1.1.15 root 3730: Delayed = true;
1.1.1.11 root 3731: }
3732:
1.1.1.15 root 3733: LOG_TRACE(TRACE_VIDEO_STE , "write ste %x hwscroll=%x delayed=%s video_cyc_w=%d line_cyc_w=%d @ nHBL=%d/video_hbl_w=%d pc=%x instr_cyc=%d\n" ,
1.1.1.13 root 3734: RegAddr , ScrollCount, Delayed ? "yes" : "no" ,
1.1.1.15 root 3735: FrameCycles, LineCycles, nHBL, HblCounterVideo, M68000_GetPC(), CurrentInstrCycles );
1.1.1.13 root 3736: }
1.1.1.11 root 3737:
3738: /*-----------------------------------------------------------------------*/
3739: /**
3740: * Write to TT shifter mode register (0xff8262)
3741: */
3742: void Video_TTShiftMode_WriteWord(void)
3743: {
3744: TTRes = IoMem_ReadByte(0xff8262) & 7;
1.1.1.21 root 3745: TTSpecialVideoMode = IoMem_ReadByte(0xff8262) & 0x90;
1.1.1.11 root 3746:
3747: /*fprintf(stderr, "Write to FF8262: %x, res=%i\n", IoMem_ReadWord(0xff8262), TTRes);*/
3748:
3749: /* Is it an ST compatible resolution? */
3750: if (TTRes <= 2)
3751: {
3752: IoMem_WriteByte(0xff8260, TTRes);
3753: Video_ShifterMode_WriteByte();
1.1.1.21 root 3754: IoMem_WriteByte(0xff8262, TTRes | TTSpecialVideoMode);
3755: }
3756:
3757: if(TTSpecialVideoMode & 0x80)
3758: {
3759: bTTSampleHold = true;
3760: }
3761: else
3762: {
3763: bTTSampleHold = false;
3764: }
3765:
3766: if(TTSpecialVideoMode & 0x10)
3767: {
3768: bTTHypermono = true;
3769: }
3770: else
3771: {
3772: bTTHypermono = false;
1.1.1.11 root 3773: }
3774: }
3775:
3776: /*-----------------------------------------------------------------------*/
3777: /**
3778: * Write to TT color register (0xff8400)
3779: */
3780: void Video_TTColorRegs_WriteWord(void)
3781: {
1.1.1.15 root 3782: bTTColorsSync = false;
1.1.1.11 root 3783: }
3784:
3785: /*-----------------------------------------------------------------------*/
3786: /**
1.1.1.15 root 3787: * Write to ST color register on TT (0xff8240)
1.1.1.11 root 3788: */
3789: void Video_TTColorSTRegs_WriteWord(void)
3790: {
1.1.1.15 root 3791: bTTColorsSTSync = false;
1.1.1.8 root 3792: }
1.1.1.22! root 3793:
! 3794:
! 3795: /*-----------------------------------------------------------------------*/
! 3796: /**
! 3797: * display video related information (for debugger info command)
! 3798: */
! 3799: void Video_Info(Uint32 dummy)
! 3800: {
! 3801: const char *mode;
! 3802: switch (OverscanMode) {
! 3803: case OVERSCANMODE_NONE:
! 3804: mode = "none";
! 3805: break;
! 3806: case OVERSCANMODE_TOP:
! 3807: mode = "top";
! 3808: break;
! 3809: case OVERSCANMODE_BOTTOM:
! 3810: mode = "bottom";
! 3811: break;
! 3812: case OVERSCANMODE_TOP|OVERSCANMODE_BOTTOM:
! 3813: mode = "top+bottom";
! 3814: break;
! 3815: default:
! 3816: mode = "unknown";
! 3817: }
! 3818: fprintf(stderr, "Video base : 0x%x\n", VideoBase);
! 3819: fprintf(stderr, "VBL counter : %d\n", nVBLs);
! 3820: fprintf(stderr, "HBL line : %d\n", nHBL);
! 3821: fprintf(stderr, "V-overscan : %s\n", mode);
! 3822: fprintf(stderr, "Refresh rate : %d Hz\n", nScreenRefreshRate);
! 3823: fprintf(stderr, "Frame skips : %d\n", nFrameSkips);
! 3824:
! 3825: /* TODO: any other information that would be useful to show? */
! 3826: }
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