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1.1 root 1: /*
1.1.1.5 root 2: Hatari - video.c
3:
4: This file is distributed under the GNU Public License, version 2 or at
5: 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). */
20: /* 2007/04/16 [NP] Better Video_CalculateAddress. We must substract a "magic" 12 cycles to */
21: /* Cycles_GetCounterOnReadAccess(CYCLES_COUNTER_VIDEO) to get a correct */
22: /* value (No Cooper's video synchro protection is finaly OK :) ). */
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 */
96: /* immediatly if display has not started for the line (before cycle */
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). */
120: /* This means a write to $ff820f should be applied immediatly only if it */
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)*/
130: /* then the new value should not be set immediatly but stored and set */
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. */
188: /* On STE, allow to change immediatly video address, hw scroll and */
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) */
1.1.1.11 root 312:
1.1.1.12 root 313:
1.1.1.15 root 314: const char Video_fileid[] = "Hatari video.c : " __DATE__ " " __TIME__;
1.1 root 315:
1.1.1.7 root 316: #include <SDL_endian.h>
1.1.1.4 root 317:
1.1 root 318: #include "main.h"
1.1.1.6 root 319: #include "configuration.h"
1.1.1.10 root 320: #include "cycles.h"
1.1 root 321: #include "fdc.h"
1.1.1.16 root 322: #include "cycInt.h"
1.1.1.8 root 323: #include "ioMem.h"
1.1.1.4 root 324: #include "keymap.h"
1.1 root 325: #include "m68000.h"
326: #include "memorySnapShot.h"
327: #include "mfp.h"
1.1.1.11 root 328: #include "printer.h"
1.1 root 329: #include "screen.h"
1.1.1.13 root 330: #include "screenSnapShot.h"
1.1 root 331: #include "shortcut.h"
332: #include "sound.h"
1.1.1.17 root 333: #include "dmaSnd.h"
1.1 root 334: #include "spec512.h"
335: #include "stMemory.h"
336: #include "vdi.h"
337: #include "video.h"
338: #include "ymFormat.h"
1.1.1.11 root 339: #include "falcon/videl.h"
340: #include "falcon/hostscreen.h"
1.1.1.16 root 341: #include "avi_record.h"
1.1.1.4 root 342:
343:
1.1.1.11 root 344: /* The border's mask allows to keep track of all the border tricks */
345: /* applied to one video line. The masks for all lines are stored in the array */
346: /* ScreenBorderMask[]. */
347: /* - bits 0-15 are used to describe the border tricks. */
348: /* - bits 20-23 are used to store the bytes offset to apply for some particular */
1.1.1.15 root 349: /* tricks (for example med res overscan can shift display by 0 or 2 bytes */
350: /* depending on when the switch to med res is done after removing the left */
1.1.1.11 root 351: /* border). */
352:
1.1.1.14 root 353: #define BORDERMASK_NONE 0x00 /* no effect on this line */
1.1.1.11 root 354: #define BORDERMASK_LEFT_OFF 0x01 /* removal of left border with hi/lo res switch -> +26 bytes */
355: #define BORDERMASK_LEFT_PLUS_2 0x02 /* line starts earlier in 60 Hz -> +2 bytes */
356: #define BORDERMASK_STOP_MIDDLE 0x04 /* line ends in hires at cycle 160 -> -106 bytes */
357: #define BORDERMASK_RIGHT_MINUS_2 0x08 /* line ends earlier in 60 Hz -> -2 bytes */
358: #define BORDERMASK_RIGHT_OFF 0x10 /* removal of right border -> +44 bytes */
359: #define BORDERMASK_RIGHT_OFF_FULL 0x20 /* full removal of right border and next left border -> +22 bytes */
1.1.1.15 root 360: #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 361: #define BORDERMASK_EMPTY_LINE 0x80 /* 60/50 Hz switch prevents the line to start, video counter is not incremented */
1.1.1.15 root 362: #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 363: #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 364: #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 365:
366:
367: int STRes = ST_LOW_RES; /* current ST resolution */
368: int TTRes; /* TT shifter resolution mode */
1.1.1.13 root 369: int nFrameSkips; /* speed up by skipping video frames */
1.1.1.9 root 370:
1.1.1.13 root 371: bool bUseHighRes; /* Use hi-res (ie Mono monitor) */
1.1 root 372: int OverscanMode; /* OVERSCANMODE_xxxx for current display frame */
1.1.1.17 root 373: Uint16 HBLPalettes[HBL_PALETTE_LINES]; /* 1x16 colour palette per screen line, +1 line just incase write after line 200 */
1.1.1.8 root 374: Uint16 *pHBLPalettes; /* Pointer to current palette lists, one per HBL */
1.1.1.17 root 375: Uint32 HBLPaletteMasks[HBL_PALETTE_MASKS]; /* Bit mask of palette colours changes, top bit set is resolution change */
1.1.1.9 root 376: Uint32 *pHBLPaletteMasks;
1.1.1.15 root 377: int nScreenRefreshRate = 50; /* 50 or 60 Hz in color, 71 Hz in mono */
1.1.1.8 root 378: Uint32 VideoBase; /* Base address in ST Ram for screen (read on each VBL) */
1.1.1.9 root 379:
1.1.1.11 root 380: int nVBLs; /* VBL Counter */
381: int nHBL; /* HBL line */
382: int nStartHBL; /* Start HBL for visible screen */
383: int nEndHBL; /* End HBL for visible screen */
1.1.1.10 root 384: int nScanlinesPerFrame = 313; /* Number of scan lines per frame */
385: int nCyclesPerLine = 512; /* Cycles per horizontal line scan */
1.1.1.13 root 386: static int nFirstVisibleHbl = FIRST_VISIBLE_HBL_50HZ; /* The first line of the ST screen that is copied to the PC screen buffer */
387: 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 388: static int CyclesPerVBL = 313*512; /* Number of cycles per VBL */
1.1.1.10 root 389:
1.1.1.13 root 390: static Uint8 HWScrollCount; /* HW scroll pixel offset, STE only (0...15) */
391: static int NewHWScrollCount = -1; /* Used in STE mode when writing to the scrolling registers $ff8264/65 */
392: static Uint8 HWScrollPrefetch; /* 0 when scrolling with $ff8264, 1 when scrolling with $ff8265 */
393: static int NewHWScrollPrefetch = -1; /* Used in STE mode when writing to the scrolling registers $ff8264/65 */
394: static Uint8 LineWidth; /* Scan line width add, STe only (words, minus 1) */
395: static int NewLineWidth = -1; /* Used in STE mode when writing to the line width register $ff820f */
1.1.1.16 root 396: static int VideoCounterDelayedOffset = 0; /* Used in STE mode when changing video counter while display is on */
397: 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 398: static Uint8 *pVideoRaster; /* Pointer to Video raster, after VideoBase in PC address space. Use to copy data on HBL */
399: static Uint8 VideoShifterByte; /* VideoShifter (0xff8260) value store in video chip */
1.1.1.15 root 400: static bool bSteBorderFlag; /* true when screen width has been switched to 336 (e.g. in Obsession) */
1.1.1.13 root 401: static int NewSteBorderFlag = -1; /* New value for next line */
402: static bool bTTColorsSync, bTTColorsSTSync; /* whether TT colors need convertion to SDL */
1.1 root 403:
1.1.1.17 root 404: static int LastCycleScroll8264; /* value of Cycles_GetCounterOnWriteAccess last time ff8264 was set for the current VBL */
405: static int LastCycleScroll8265; /* value of Cycles_GetCounterOnWriteAccess last time ff8265 was set for the current VBL */
406:
407: static int LineRemoveTopCycle = LINE_REMOVE_TOP_CYCLE_STF;
408: static int LineRemoveBottomCycle = LINE_REMOVE_BOTTOM_CYCLE_STF;
409: static int RestartVideoCounterCycle = RESTART_VIDEO_COUNTER_CYCLE_STF;
410: static int VblVideoCycleOffset = VBL_VIDEO_CYCLE_OFFSET_STF;
1.1.1.13 root 411:
1.1.1.15 root 412: int LastCycleHblException; /* value of Cycles_GetCounter last time a level 2 interrupt was executed by the CPU */
413:
1.1.1.13 root 414: int LineTimerBCycle = LINE_END_CYCLE_50 + TIMERB_VIDEO_CYCLE_OFFSET; /* position of the Timer B interrupt on active lines */
1.1.1.15 root 415: int TimerBEventCountCycleStart = -1; /* value of Cycles_GetCounterOnWriteAccess last time timer B was started for the current VBL */
1.1 root 416:
1.1.1.14 root 417: #define HBL_JITTER_MAX_POS 5
418: int HblJitterIndex = 0;
419: int HblJitterArray[] = { 8,4,4,0,0 }; /* measured on STF */
420: int HblJitterArrayPending[] = { 4,4,4,4,4 }; // { 8,8,12,8,12 }; /* measured on STF, not always accurate */
421: #define VBL_JITTER_MAX_POS 5
422: int VblJitterIndex = 0;
423: int VblJitterArray[] = { 8,0,4,0,4 }; /* measured on STF */
424: int VblJitterArrayPending[] = { 8,8,12,8,12 }; /* not verified on STF, use the same as HBL */
425:
1.1.1.18 root 426: int BlankLines = 0; /* Number of empty line with no signal (by switching hi/lo near cycles 500) */
1.1.1.12 root 427:
1.1.1.15 root 428:
429: typedef struct
430: {
431: int VBL; /* VBL for this Pos (or -1 if Pos not defined for now) */
432: int FrameCycles; /* Number of cycles since this VBL */
433: int HBL; /* HBL in the VBL */
434: int LineCycles; /* cycles in the HBL */
435: } SHIFTER_POS;
436:
437:
438: typedef struct
439: {
440: int StartCycle; /* first cycle of this line, as returned by Cycles_GetCounter */
441:
442: Uint32 BorderMask; /* borders' states for this line */
443: int DisplayPixelShift; /* number of pixels to shift the whole line (<0 shift to the left, >0 shift to the right) */
444: /* On STF, this is obtained when switching hi/med for a variable number of cycles, */
445: /* but just removing left border will shift the line too. */
446:
447: int DisplayStartCycle; /* cycle where display starts for this line (0-512) : 0, 52 or 56 */
448: int DisplayEndCycle; /* cycle where display ends for this line (0-512) : 0, 160, 372, 376, 460 or 512 */
449: int DisplayBytes; /* how many bytes to display for this line */
450:
451: } SHIFTER_LINE;
452:
453:
454: typedef struct
455: {
456: int HBL_CyclePos; /* cycle position for the HBL int (depends on freq/res) */
457: int TimerB_CyclePos; /* cycle position for the Timer B int (depends on freq/res) */
458:
459: int Freq; /* value of ff820a & 2, or -1 if not set */
460: int Res; /* value of ff8260 & 3, or -1 if not set */
461: SHIFTER_POS FreqPos50; /* position of latest freq change to 50 Hz*/
462: SHIFTER_POS FreqPos60; /* position of latest freq change to 60 Hz*/
463: SHIFTER_POS ResPosLo; /* position of latest change to low res */
464: SHIFTER_POS ResPosMed; /* position of latest change to med res */
465: SHIFTER_POS ResPosHi; /* position of latest change to high res */
466:
467: SHIFTER_POS Scroll8264Pos; /* position of latest write to $ff8264 */
468: SHIFTER_POS Scroll8265Pos; /* position of latest write to $ff8265 */
469:
470: SHIFTER_LINE ShifterLines[ MAX_SCANLINES_PER_FRAME ];
471: } SHIFTER_FRAME;
472:
473:
474: SHIFTER_FRAME ShifterFrame;
475:
476:
477:
478: /*--------------------------------------------------------------*/
479: /* Local functions prototypes */
480: /*--------------------------------------------------------------*/
481:
482: static void Video_SetSystemTimings ( void );
483:
484: static Uint32 Video_CalculateAddress ( void );
1.1.1.16 root 485: static int Video_GetMMUStartCycle ( int DisplayStartCycle );
1.1.1.15 root 486: static void Video_WriteToShifter ( Uint8 Res );
487: static void Video_Sync_SetDefaultStartEnd ( Uint8 Freq , int HblCounterVideo , int LineCycles );
488:
489: static int Video_HBL_GetPos ( void );
1.1.1.18 root 490: static int Video_TimerB_GetDefaultPos ( void );
1.1.1.15 root 491: static void Video_EndHBL ( void );
492: static void Video_StartHBL ( void );
493:
494: static void Video_StoreFirstLinePalette(void);
495: static void Video_StoreResolution(int y);
496: static void Video_CopyScreenLineMono(void);
497: static void Video_CopyScreenLineColor(void);
498: static void Video_CopyVDIScreen(void);
499: static void Video_SetHBLPaletteMaskPointers(void);
500:
501: static void Video_UpdateTTPalette(int bpp);
502: static void Video_DrawScreen(void);
503:
504: static void Video_ResetShifterTimings(void);
505: static void Video_InitShifterLines(void);
506: static void Video_ClearOnVBL(void);
507:
508: static void Video_AddInterrupt ( int Pos , interrupt_id Handler );
509: static void Video_AddInterruptHBL ( int Pos );
510:
511: static void Video_ColorReg_WriteWord(Uint32 addr);
512:
513:
1.1 root 514: /*-----------------------------------------------------------------------*/
1.1.1.11 root 515: /**
516: * Save/Restore snapshot of local variables('MemorySnapShot_Store' handles type)
517: */
1.1.1.13 root 518: void Video_MemorySnapShot_Capture(bool bSave)
1.1 root 519: {
1.1.1.11 root 520: /* Save/Restore details */
521: MemorySnapShot_Store(&VideoShifterByte, sizeof(VideoShifterByte));
522: MemorySnapShot_Store(&TTRes, sizeof(TTRes));
523: MemorySnapShot_Store(&bUseHighRes, sizeof(bUseHighRes));
524: MemorySnapShot_Store(&nVBLs, sizeof(nVBLs));
525: MemorySnapShot_Store(&nHBL, sizeof(nHBL));
526: MemorySnapShot_Store(&nStartHBL, sizeof(nStartHBL));
527: MemorySnapShot_Store(&nEndHBL, sizeof(nEndHBL));
528: MemorySnapShot_Store(&OverscanMode, sizeof(OverscanMode));
529: MemorySnapShot_Store(HBLPalettes, sizeof(HBLPalettes));
530: MemorySnapShot_Store(HBLPaletteMasks, sizeof(HBLPaletteMasks));
531: MemorySnapShot_Store(&VideoBase, sizeof(VideoBase));
532: MemorySnapShot_Store(&LineWidth, sizeof(LineWidth));
533: MemorySnapShot_Store(&HWScrollCount, sizeof(HWScrollCount));
534: MemorySnapShot_Store(&pVideoRaster, sizeof(pVideoRaster));
535: MemorySnapShot_Store(&nScanlinesPerFrame, sizeof(nScanlinesPerFrame));
536: MemorySnapShot_Store(&nCyclesPerLine, sizeof(nCyclesPerLine));
537: MemorySnapShot_Store(&nFirstVisibleHbl, sizeof(nFirstVisibleHbl));
538: MemorySnapShot_Store(&bSteBorderFlag, sizeof(bSteBorderFlag));
1.1.1.14 root 539: MemorySnapShot_Store(&HblJitterIndex, sizeof(HblJitterIndex));
540: MemorySnapShot_Store(&VblJitterIndex, sizeof(VblJitterIndex));
1.1.1.15 root 541: MemorySnapShot_Store(&ShifterFrame, sizeof(ShifterFrame));
542: }
543:
544:
545: /*-----------------------------------------------------------------------*/
546: /**
547: * Reset video chip
548: */
549: void Video_Reset(void)
550: {
551: /* NOTE! Must reset all of these register type things here!!!! */
1.1.1.19! root 552: Video_Reset_Glue();
1.1.1.15 root 553:
554: /* Set system specific timings */
555: Video_SetSystemTimings();
556:
557: /* Reset VBL counter */
558: nVBLs = 0;
559: /* Reset addresses */
560: VideoBase = 0L;
561:
562: /* Reset shifter's state variables */
563: ShifterFrame.Freq = -1;
564: ShifterFrame.Res = -1;
565: ShifterFrame.FreqPos50.VBL = -1;
566: ShifterFrame.FreqPos60.VBL = -1;
567: ShifterFrame.ResPosLo.VBL = -1;
568: ShifterFrame.ResPosMed.VBL = -1;
569: ShifterFrame.ResPosHi.VBL = -1;
570: ShifterFrame.Scroll8264Pos.VBL = -1;
571: ShifterFrame.Scroll8265Pos.VBL = -1;
572:
573: Video_InitShifterLines ();
574:
575: /* Reset STE screen variables */
576: LineWidth = 0;
577: HWScrollCount = 0;
578: bSteBorderFlag = false;
579:
580: NewLineWidth = -1; /* cancel pending modifications set before the reset */
581: NewHWScrollCount = -1;
582:
1.1.1.16 root 583: VideoCounterDelayedOffset = 0;
584: pVideoRasterDelayed = NULL;
585:
1.1.1.15 root 586: /* Reset jitter indexes */
587: HblJitterIndex = 0;
588: VblJitterIndex = 0;
589:
590: /* Clear framecycles counter */
591: Cycles_SetCounter(CYCLES_COUNTER_VIDEO, 0);
592:
593: /* Clear ready for new VBL */
594: Video_ClearOnVBL();
595: }
596:
597:
598: /*-----------------------------------------------------------------------*/
599: /**
600: * Reset the GLUE chip responsible for generating the H/V sync signals.
601: * When the 68000 RESET instruction is called, frequency and resolution
602: * should be reset to 0.
603: */
604: void Video_Reset_Glue(void)
605: {
1.1.1.19! root 606: IoMem_WriteByte(0xff820a,0); /* Video frequency */
! 607:
! 608: /* Are we in high-res? */
! 609: if (bUseHighRes)
! 610: VideoShifterByte = ST_HIGH_RES; /* Mono monitor */
! 611: else
! 612: VideoShifterByte = ST_LOW_RES;
! 613: if (bUseVDIRes)
! 614: VideoShifterByte = VDIRes;
! 615:
! 616: IoMem_WriteByte(0xff8260, VideoShifterByte);
1.1 root 617: }
618:
1.1.1.8 root 619:
1.1 root 620: /*-----------------------------------------------------------------------*/
1.1.1.12 root 621: /*
622: * Set specific video timings, depending on the system being emulated.
623: */
1.1.1.15 root 624: static void Video_SetSystemTimings(void)
1.1.1.12 root 625: {
1.1.1.19! root 626: if ( ConfigureParams.System.nMachineType == MACHINE_ST )
! 627: {
! 628: LineRemoveTopCycle = LINE_REMOVE_TOP_CYCLE_STF;
! 629: LineRemoveBottomCycle = LINE_REMOVE_BOTTOM_CYCLE_STF;
! 630: RestartVideoCounterCycle = RESTART_VIDEO_COUNTER_CYCLE_STF;
! 631: VblVideoCycleOffset = VBL_VIDEO_CYCLE_OFFSET_STF;
! 632: }
! 633: else /* STE, Falcon, TT */
! 634: {
! 635: LineRemoveTopCycle = LINE_REMOVE_TOP_CYCLE_STE;
! 636: LineRemoveBottomCycle = LINE_REMOVE_BOTTOM_CYCLE_STE;
! 637: RestartVideoCounterCycle = RESTART_VIDEO_COUNTER_CYCLE_STE;
! 638: VblVideoCycleOffset = VBL_VIDEO_CYCLE_OFFSET_STE;
! 639: }
1.1.1.12 root 640: }
641:
642:
643: /*-----------------------------------------------------------------------*/
1.1.1.11 root 644: /**
1.1.1.15 root 645: * Convert the elapsed number of cycles since the start of the VBL
646: * into the corresponding HBL number and the cycle position in the current
647: * HBL. We use the starting cycle position of the closest HBL to compute
648: * the cycle position on the line (this allows to mix lines with different
649: * values for nCyclesPerLine).
650: * We can have 2 cases on the limit where the real video line count can be
651: * different from nHBL :
652: * - when reading video address between cycle 0 and 12, LineCycle will be <0,
653: * so we need to use the data from line nHBL-1
654: * - if LineCycle >= nCyclesPerLine, this means the HBL int was not processed
655: * yet, so the video line number is in fact nHBL+1
656: */
657:
658: void Video_ConvertPosition ( int FrameCycles , int *pHBL , int *pLineCycles )
659: {
1.1.1.16 root 660: if ( 0 && FrameCycles >= CyclesPerVBL ) /* rare case between end of last hbl and start of next VBL (during 64 cycles) */
1.1.1.15 root 661: {
1.1.1.16 root 662: *pHBL = ( FrameCycles - CyclesPerVBL ) / nCyclesPerLine;
663: *pLineCycles = ( FrameCycles - CyclesPerVBL ) % nCyclesPerLine;
664: //fprintf ( stderr , "out of vbl FrameCycles %d CyclesPerVBL %d nHBL=%d %d %d\n" , FrameCycles , CyclesPerVBL, nHBL , *pHBL , *pLineCycles );
1.1.1.15 root 665: }
1.1.1.16 root 666:
667: else /* most common case */
1.1.1.15 root 668: {
1.1.1.16 root 669: *pHBL = nHBL;
670: *pLineCycles = FrameCycles - ShifterFrame.ShifterLines[ nHBL ].StartCycle;
1.1.1.15 root 671:
1.1.1.16 root 672: if ( *pLineCycles < 0 ) /* reading from the previous video line */
673: {
674: *pHBL = nHBL-1;
675: *pLineCycles = FrameCycles - ShifterFrame.ShifterLines[ nHBL-1 ].StartCycle;
676: }
677:
678: else if ( *pLineCycles >= nCyclesPerLine ) /* reading on the next line, but HBL int was delayed */
679: {
680: *pHBL = nHBL+1;
681: *pLineCycles -= nCyclesPerLine;
682: }
683: }
1.1.1.15 root 684:
685: if ( *pLineCycles < 0 )
686: fprintf ( stderr , "bug nHBL=%d %d %d\n" , nHBL , *pHBL , *pLineCycles );
687:
688: //if ( ( *pHBL != FrameCycles / nCyclesPerLine ) || ( *pLineCycles != FrameCycles % nCyclesPerLine ) )
689: // LOG_TRACE ( TRACE_VIDEO_ADDR , "conv pos %d %d - %d %d\n" , *pHBL , FrameCycles / nCyclesPerLine , *pLineCycles , FrameCycles % nCyclesPerLine );
690: // LOG_TRACE ( TRACE_VIDEO_ADDR , "conv pos %d %d %d\n" , FrameCycles , *pHBL , *pLineCycles );
691: }
692:
693:
694: void Video_GetPosition ( int *pFrameCycles , int *pHBL , int *pLineCycles )
695: {
696: *pFrameCycles = Cycles_GetCounter(CYCLES_COUNTER_VIDEO);
697: Video_ConvertPosition ( *pFrameCycles , pHBL , pLineCycles );
698: }
699:
700:
701: void Video_GetPosition_OnWriteAccess ( int *pFrameCycles , int *pHBL , int *pLineCycles )
702: {
703: *pFrameCycles = Cycles_GetCounterOnWriteAccess(CYCLES_COUNTER_VIDEO);
704: Video_ConvertPosition ( *pFrameCycles , pHBL , pLineCycles );
705: }
706:
707:
708: void Video_GetPosition_OnReadAccess ( int *pFrameCycles , int *pHBL , int *pLineCycles )
709: {
710: *pFrameCycles = Cycles_GetCounterOnReadAccess(CYCLES_COUNTER_VIDEO);
711: Video_ConvertPosition ( *pFrameCycles , pHBL , pLineCycles );
712: }
713:
714:
715: /*-----------------------------------------------------------------------*/
716: /**
1.1.1.11 root 717: * Calculate and return video address pointer.
718: */
1.1.1.15 root 719: static Uint32 Video_CalculateAddress ( void )
1.1 root 720: {
1.1.1.15 root 721: int FrameCycles, HblCounterVideo, LineCycles;
722: int X, NbBytes;
1.1.1.11 root 723: Uint32 VideoAddress; /* Address of video display in ST screen space */
724: int nSyncByte;
725: int LineBorderMask;
726: int PrevSize;
727: int CurSize;
1.1.1.15 root 728: int LineStartCycle , LineEndCycle;
1.1.1.11 root 729:
730: /* Find number of cycles passed during frame */
731: /* We need to substract '12' for correct video address calculation */
1.1.1.15 root 732: FrameCycles = Cycles_GetCounterOnReadAccess(CYCLES_COUNTER_VIDEO) - 12;
1.1.1.11 root 733:
734: /* Now find which pixel we are on (ignore left/right borders) */
1.1.1.15 root 735: Video_ConvertPosition ( FrameCycles , &HblCounterVideo , &LineCycles );
736: X = LineCycles;
1.1.1.11 root 737:
738: nSyncByte = IoMem_ReadByte(0xff820a) & 2; /* only keep bit 1 */
739: if (nSyncByte) /* 50 Hz */
740: {
741: LineStartCycle = LINE_START_CYCLE_50;
742: LineEndCycle = LINE_END_CYCLE_50;
743: }
744: else /* 60 Hz */
745: {
746: LineStartCycle = LINE_START_CYCLE_60;
747: LineEndCycle = LINE_END_CYCLE_60;
748: }
749:
750:
751: /* Top of screen is usually 63 lines from VBL in 50 Hz */
1.1.1.15 root 752: if ( HblCounterVideo < nStartHBL )
1.1.1.11 root 753: {
754: /* pVideoRaster was set during Video_ClearOnVBL using VideoBase */
755: /* and it could also have been modified on STE by writing to ff8205/07/09 */
1.1.1.15 root 756: /* So, we should not use ff8201/ff8203 which are reloaded in ff8205/ff8207 only once per VBL */
757: /* but use pVideoRaster - STRam instead to get current shifter video address */
1.1.1.11 root 758: VideoAddress = pVideoRaster - STRam;
759: }
760:
1.1.1.15 root 761: else if (FrameCycles > RestartVideoCounterCycle)
1.1.1.11 root 762: {
763: /* This is where ff8205/ff8207 are reloaded with the content of ff8201/ff8203 on a real ST */
764: /* (used in ULM DSOTS demos). VideoBase is also reloaded in Video_ClearOnVBL to be sure */
765: VideoBase = (Uint32)IoMem_ReadByte(0xff8201)<<16 | (Uint32)IoMem_ReadByte(0xff8203)<<8;
766: if (ConfigureParams.System.nMachineType != MACHINE_ST)
767: {
768: /* on STe 2 aligned, on Falcon 4 aligned, on TT 8 aligned. We do STe. */
769: VideoBase |= IoMem_ReadByte(0xff820d) & ~1;
770: }
771:
772: VideoAddress = VideoBase;
773: }
774:
775: else
776: {
777: VideoAddress = pVideoRaster - STRam; /* pVideoRaster is updated by Video_CopyScreenLineColor */
778:
779: /* Now find which pixel we are on (ignore left/right borders) */
1.1.1.15 root 780: // X = ( Cycles_GetCounterOnReadAccess(CYCLES_COUNTER_VIDEO) - 12 ) % nCyclesPerLine;
1.1.1.11 root 781:
782: /* Get real video line count (can be different from nHBL) */
1.1.1.15 root 783: // HblCounterVideo = ( Cycles_GetCounterOnReadAccess(CYCLES_COUNTER_VIDEO) - 12 ) / nCyclesPerLine;
1.1.1.11 root 784:
785: /* Correct the case when read overlaps end of line / start of next line */
786: /* Video_CopyScreenLineColor was not called yet to update VideoAddress */
787: /* so we need to determine the size of the previous line to get the */
788: /* correct value of VideoAddress. */
789: PrevSize = 0;
790: if ( HblCounterVideo < nHBL )
791: X = 0;
792: else if ( ( HblCounterVideo > nHBL ) /* HblCounterVideo = nHBL+1 */
793: && ( nHBL >= nStartHBL ) ) /* if nHBL was not visible, PrevSize = 0 */
794: {
1.1.1.15 root 795: LineBorderMask = ShifterFrame.ShifterLines[ HblCounterVideo-1 ].BorderMask; /* get border mask for nHBL */
1.1.1.11 root 796: PrevSize = BORDERBYTES_NORMAL; /* normal line */
797:
798: if (LineBorderMask & BORDERMASK_LEFT_OFF)
799: PrevSize += BORDERBYTES_LEFT;
800: else if (LineBorderMask & BORDERMASK_LEFT_PLUS_2)
801: PrevSize += 2;
802:
803: if (LineBorderMask & BORDERMASK_STOP_MIDDLE)
804: PrevSize -= 106;
805: else if (LineBorderMask & BORDERMASK_RIGHT_MINUS_2)
806: PrevSize -= 2;
807: else if (LineBorderMask & BORDERMASK_RIGHT_OFF)
808: PrevSize += BORDERBYTES_RIGHT;
809:
810: if (LineBorderMask & BORDERMASK_EMPTY_LINE)
811: PrevSize = 0;
812: }
813:
814:
1.1.1.15 root 815: LineBorderMask = ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask;
1.1.1.11 root 816:
817: CurSize = BORDERBYTES_NORMAL; /* normal line */
818:
819: if (LineBorderMask & BORDERMASK_LEFT_OFF)
820: CurSize += BORDERBYTES_LEFT;
821: else if (LineBorderMask & BORDERMASK_LEFT_PLUS_2)
822: CurSize += 2;
1.1.1.16 root 823: else if (bSteBorderFlag) /* bigger line by 8 bytes on the left (STE specific) */
824: CurSize += 8;
825: else if ( ( HWScrollCount > 0 ) && ( HWScrollPrefetch == 1 ) )
826: CurSize += 8; /* 8 more bytes are loaded when scrolling with prefetching */
1.1.1.11 root 827:
828: if (LineBorderMask & BORDERMASK_STOP_MIDDLE)
829: CurSize -= 106;
830: else if (LineBorderMask & BORDERMASK_RIGHT_MINUS_2)
831: CurSize -= 2;
832: else if (LineBorderMask & BORDERMASK_RIGHT_OFF)
833: CurSize += BORDERBYTES_RIGHT;
834: if (LineBorderMask & BORDERMASK_RIGHT_OFF_FULL)
835: CurSize += BORDERBYTES_RIGHT_FULL;
836:
837: if ( LineBorderMask & BORDERMASK_LEFT_PLUS_2)
838: LineStartCycle = LINE_START_CYCLE_60;
839: else if ( LineBorderMask & BORDERMASK_LEFT_OFF )
1.1.1.15 root 840: LineStartCycle = LINE_START_CYCLE_71;
1.1.1.16 root 841: else if ( bSteBorderFlag )
842: LineStartCycle -= 16; /* display starts 16 pixels earlier */
843: else if ( ( HWScrollCount > 0 ) && ( HWScrollPrefetch == 1 ) )
844: LineStartCycle -= 16; /* shifter starts reading 16 pixels earlier when scrolling with prefetching */
1.1.1.11 root 845:
846: LineEndCycle = LineStartCycle + CurSize*2;
847:
848:
849: if ( X < LineStartCycle )
1.1.1.16 root 850: X = LineStartCycle; /* display is disabled in the left border */
1.1.1.11 root 851: else if ( X > LineEndCycle )
1.1.1.16 root 852: {
853: X = LineEndCycle; /* display is disabled in the right border */
854: /* On STE, the Shifter skips the given amount of words as soon as display is disabled */
855: /* (LineWidth is 0 on STF */
856: VideoAddress += LineWidth*2;
857: }
1.1.1.11 root 858:
859: NbBytes = ( (X-LineStartCycle)>>1 ) & (~1); /* 2 cycles per byte */
860:
861:
862: /* when left border is open, we have 2 bytes less than theorical value */
863: /* (26 bytes in left border, which is not a multiple of 4 cycles) */
864: if ( LineBorderMask & BORDERMASK_LEFT_OFF )
865: NbBytes -= 2;
866:
867: if ( LineBorderMask & BORDERMASK_EMPTY_LINE )
868: NbBytes = 0;
869:
1.1.1.16 root 870: /* Add line cycles if we have not reached end of screen yet */
1.1.1.18 root 871: if ( HblCounterVideo < nEndHBL + BlankLines )
1.1.1.11 root 872: VideoAddress += PrevSize + NbBytes;
873: }
874:
1.1.1.16 root 875: LOG_TRACE(TRACE_VIDEO_ADDR , "video base=%x raster=%x addr=%x video_cyc=%d "
876: "line_cyc=%d/X=%d @ nHBL=%d/video_hbl=%d %d<->%d pc=%x instr_cyc=%d\n",
877: VideoBase, (int)(pVideoRaster - STRam), VideoAddress,
878: Cycles_GetCounter(CYCLES_COUNTER_VIDEO), LineCycles, X, nHBL,
879: HblCounterVideo, LineStartCycle, LineEndCycle, M68000_GetPC(), CurrentInstrCycles);
1.1.1.11 root 880:
881: return VideoAddress;
882: }
883:
884:
885: /*-----------------------------------------------------------------------*/
886: /**
1.1.1.16 root 887: * Calculate the cycle where the STF/STE's MMU starts reading
888: * data to send them to the shifter.
889: * On STE, if hscroll is used, prefetch will cause this position to
890: * happen 16 cycles earlier.
891: * This function should use the same logic as in Video_CalculateAddress.
892: * NOTE : this function is not completly accurate, as even when there's
893: * no hscroll (on STF) the mmu starts reading 16 cycles before display starts.
894: * But it's good enough to emulate writing to ff8205/07/09 on STE.
895: */
896: static int Video_GetMMUStartCycle ( int DisplayStartCycle )
897: {
898: if ( bSteBorderFlag )
899: DisplayStartCycle -= 16; /* display starts 16 pixels earlier */
900: else if ( ( HWScrollCount > 0 ) && ( HWScrollPrefetch == 1 ) )
901: DisplayStartCycle -= 16; /* shifter starts reading 16 pixels earlier when scrolling with prefetching */
902:
903: return DisplayStartCycle;
904: }
905:
906:
907: /*-----------------------------------------------------------------------*/
908: /**
1.1.1.11 root 909: * Write to VideoShifter (0xff8260), resolution bits
910: */
1.1.1.15 root 911: static void Video_WriteToShifter ( Uint8 Res )
1.1 root 912: {
1.1.1.15 root 913: int FrameCycles, HblCounterVideo, LineCycles;
1.1.1.11 root 914:
1.1.1.15 root 915: Video_GetPosition_OnWriteAccess ( &FrameCycles , &HblCounterVideo , &LineCycles );
1.1.1.11 root 916:
1.1.1.15 root 917: 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",
918: Res, FrameCycles, LineCycles, nHBL, HblCounterVideo, M68000_GetPC(), CurrentInstrCycles );
1.1.1.11 root 919:
920:
1.1.1.13 root 921: /* Ignore consecutive writes of the same value */
1.1.1.15 root 922: if ( Res == ShifterFrame.Res )
1.1.1.13 root 923: return; /* do nothing */
924:
1.1.1.15 root 925:
926: if ( Res == 0x02 ) /* switch to high res */
927: {
928: if ( LineCycles < ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle ) /* start could be 0,52,56 */
929: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle = LINE_START_CYCLE_71;
930:
931: if ( ( LineCycles < ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle ) /* end could be 160,372,376,460 */
932: && ( LineCycles < LINE_END_CYCLE_71 ) )
933: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle = LINE_END_CYCLE_71;
934: }
935: else /* switch to lo/med res */
936: {
937: /* In lo/med res, display start/end depends on the freq register in $ff820a */
938: Video_Sync_SetDefaultStartEnd ( IoMem[0xff820a] & 2 , HblCounterVideo , LineCycles );
939: }
940:
941:
1.1.1.11 root 942: /* Remove left border : +26 bytes */
1.1.1.15 root 943: /* This can be done with a hi/lo res switch or a hi/med res switch */
944: if ( ( ShifterFrame.Res == 0x02 ) && ( Res == 0x00 ) /* switched from hi res to lo res */
1.1.1.16 root 945: // && ( LineCycles >= 12 ) /* switch back to low res should be after cycle 8 */
1.1.1.19! root 946: && ( ( ShifterFrame.ResPosHi.LineCycles < 12 ) || ( ShifterFrame.ResPosHi.LineCycles >= 504 ) ) /* switch to hi between 504 and 8 */
1.1.1.15 root 947: && ( LineCycles <= (LINE_START_CYCLE_71+28) )
1.1.1.17 root 948: && ( FrameCycles - ShifterFrame.ResPosHi.FrameCycles <= 32 ) )
1.1.1.15 root 949: {
1.1.1.17 root 950: if ( ( ( ConfigureParams.System.nMachineType == MACHINE_STE ) /* special case for 504/4 on STE -> add 20 bytes to left border */
951: || ( ConfigureParams.System.nMachineType == MACHINE_MEGA_STE ) )
1.1.1.16 root 952: && ( ShifterFrame.ResPosHi.LineCycles == 504 ) && ( LineCycles == 4 ) )
953: {
954: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_LEFT_OFF_2_STE;
955: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle = LINE_START_CYCLE_71+16; /* starts 16 pixels later */
1.1.1.17 root 956: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayPixelShift = -8; /* screen is shifted 8 pixels to the left */
1.1.1.16 root 957: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect remove left 2 ste %d<->%d\n" ,
958: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
959: }
960: else /* other case for STF/STE -> add 26 bytes */
961: {
962: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_LEFT_OFF;
963: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle = LINE_START_CYCLE_71;
964: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayPixelShift = -4; /* screen is shifted 4 pixels to the left */
965: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect remove left %d<->%d\n" ,
966: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
967: }
1.1.1.15 root 968: }
969:
970: if ( ( ShifterFrame.Res == 0x02 ) && ( Res == 0x01 ) /* switched from hi res to med res */
971: && ( LineCycles <= (LINE_START_CYCLE_71+20) )
972: && ( FrameCycles - ShifterFrame.ResPosHi.FrameCycles <= 30 ) )
973: {
974: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_LEFT_OFF_MED; /* a later switch to low res might gives right scrolling */
975: /* By default, this line will be in med res, except if we detect hardware scrolling later */
976: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_OVERSCAN_MED_RES | ( 2 << 20 );
977: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle = LINE_START_CYCLE_71;
978: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect remove left med %d<->%d\n" ,
979: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
980: }
981:
982: /* Empty line switching res on STF : switch to hi res on cycle 28, then go back to med/lo res */
983: /* This creates a 0 byte line, the video counter won't change for this line */
984: else if ( ( ShifterFrame.Res == 0x02 ) /* switched from hi res */
985: && ( FrameCycles - ShifterFrame.ResPosHi.FrameCycles <= 16 )
986: && ( ShifterFrame.ResPosHi.LineCycles == LINE_EMPTY_CYCLE_71_STF )
987: && ( ConfigureParams.System.nMachineType == MACHINE_ST ) )
988: {
989: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_EMPTY_LINE;
990: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle = 0;
991: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle = 0;
992: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect empty line res %d<->%d\n" ,
993: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
994: }
995:
996: /* Empty line switching res on STE (switch is 4 cycles later than on STF) */
997: else if ( ( ShifterFrame.Res == 0x02 ) /* switched from hi res */
998: && ( FrameCycles - ShifterFrame.ResPosHi.FrameCycles <= 16 )
999: && ( ShifterFrame.ResPosHi.LineCycles == LINE_EMPTY_CYCLE_71_STE )
1.1.1.17 root 1000: && ( ( ConfigureParams.System.nMachineType == MACHINE_STE )
1001: || ( ConfigureParams.System.nMachineType == MACHINE_MEGA_STE ) ) )
1.1.1.15 root 1002: {
1003: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_EMPTY_LINE;
1004: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle = 0;
1005: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle = 0;
1006: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect empty line res %d<->%d\n" ,
1007: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
1008: }
1009:
1010: /* 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 1011: /* Next HBL will be an empty line (used in 'No Buddies Land' and 'Delirious Demo IV / NGC') */
1.1.1.15 root 1012: else if ( ( ShifterFrame.Res == 0x02 ) /* switched from hi res */
1.1.1.18 root 1013: && ( ( ShifterFrame.ResPosHi.LineCycles == 500-4 ) || ( ShifterFrame.ResPosHi.LineCycles == 500 ) )
1.1.1.15 root 1014: && ( LineCycles == 508 ) )
1015: {
1.1.1.16 root 1016: ShifterFrame.ShifterLines[ HblCounterVideo+1 ].BorderMask |= BORDERMASK_EMPTY_LINE;
1017: ShifterFrame.ShifterLines[ HblCounterVideo+1 ].DisplayStartCycle = 0;
1018: ShifterFrame.ShifterLines[ HblCounterVideo+1 ].DisplayEndCycle = 0;
1.1.1.18 root 1019: BlankLines++; /* no video signal at all for this line */
1.1.1.16 root 1020: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect empty line res 2 %d<->%d for nHBL=%d\n" ,
1021: ShifterFrame.ShifterLines[ HblCounterVideo+1 ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo+1 ].DisplayEndCycle , nHBL+1 );
1.1.1.15 root 1022: }
1023:
1024: /* Start right border near middle of the line : -106 bytes */
1025: /* Switch to hi res just before the start of the right border in hi res, then go back to lo/mid res */
1026: if ( ( ShifterFrame.Res == 0x02 ) /* switched from hi res */
1027: && ( ShifterFrame.ResPosHi.HBL == HblCounterVideo ) /* switch during the same line */
1028: && ( ShifterFrame.ResPosHi.LineCycles <= LINE_END_CYCLE_71+4 ) /* switched to hi res before cycle 164 */
1029: && ( LineCycles >= LINE_END_CYCLE_71+4 ) ) /* switch to lo res after cycle 164 */
1030: {
1031: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_STOP_MIDDLE;
1032: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle = LINE_END_CYCLE_71;
1033: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect stop middle %d<->%d\n" ,
1034: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
1035: }
1036:
1037: /* Remove right border a second time after removing it a first time. Display will */
1038: /* stop at cycle 512 instead of 460. */
1039: /* This removes left border on next line too (used in 'Enchanted Lands') */
1.1.1.16 root 1040: /* If right border was not removed, then we will get an empty line for the next HBL (used in Beyond by Kruz) */
1041: if ( ( ShifterFrame.Res == 0x02 ) /* switched from hi res */
1042: && ( LineCycles > LINE_END_CYCLE_50_2 ) /* switch to low just after end of right border */
1043: && ( ShifterFrame.ResPosHi.LineCycles <= LINE_END_CYCLE_50_2 ) /* switch to hi just before end of right border */
1044: && ( FrameCycles - ShifterFrame.ResPosHi.FrameCycles <= 20 ) )
1045: {
1046: if ( ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask & BORDERMASK_RIGHT_OFF ) /* Enchanted Lands */
1047: {
1048: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_RIGHT_OFF_FULL;
1049: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle = LINE_END_CYCLE_FULL;
1050: ShifterFrame.ShifterLines[ HblCounterVideo+1 ].BorderMask |= BORDERMASK_LEFT_OFF; /* no left border on next line */
1051: ShifterFrame.ShifterLines[ HblCounterVideo+1 ].DisplayStartCycle = LINE_START_CYCLE_71;
1052: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect remove right full %d<->%d\n" ,
1053: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
1054: }
1055: else /* Pax Plax Parralax in Beyond by Kruz */
1056: {
1057: ShifterFrame.ShifterLines[ HblCounterVideo+1 ].BorderMask = BORDERMASK_EMPTY_LINE;
1058: ShifterFrame.ShifterLines[ HblCounterVideo+1 ].DisplayStartCycle = 0;
1059: ShifterFrame.ShifterLines[ HblCounterVideo+1 ].DisplayEndCycle = 0;
1060: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect empty line res 3 %d<->%d for nHBL=%d\n" ,
1061: ShifterFrame.ShifterLines[ HblCounterVideo+1 ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo+1 ].DisplayEndCycle , nHBL+1 );
1062: }
1.1.1.15 root 1063: }
1064:
1065: /* If left border is opened and we switch to medium resolution during the next cycles, */
1066: /* then we assume a med res overscan line instead of a low res overscan line. */
1067: /* Note that in that case, the switch to med res can shift the display by 0-3 words */
1.1.1.11 root 1068: /* Used in 'No Cooper' greetings by 1984 and 'Punish Your Machine' by Delta Force */
1.1.1.15 root 1069: if ( ( ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask & BORDERMASK_LEFT_OFF )
1070: && ( Res == 0x01 ) )
1.1.1.11 root 1071: {
1.1.1.18 root 1072: if ( ( LineCycles == LINE_LEFT_MED_CYCLE_1 ) /* 'No Cooper' timing */
1073: || ( LineCycles == LINE_LEFT_MED_CYCLE_1+16 ) ) /* 'No Cooper' timing while removing bottom border */
1.1.1.11 root 1074: {
1.1.1.15 root 1075: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect med res overscan offset 0 byte\n" );
1076: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_OVERSCAN_MED_RES | ( 0 << 20 );
1.1.1.11 root 1077: }
1.1.1.15 root 1078: else if ( LineCycles == LINE_LEFT_MED_CYCLE_2 ) /* 'Best Part Of The Creation / PYM' timing */
1.1.1.11 root 1079: {
1.1.1.15 root 1080: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect med res overscan offset 2 bytes\n" );
1081: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_OVERSCAN_MED_RES | ( 2 << 20 );
1.1.1.11 root 1082: }
1083: }
1084:
1.1.1.15 root 1085: /* If left border was opened with a hi/med res switch we need to check */
1086: /* if the switch to low res can trigger a right hardware scrolling. */
1087: /* We store the pixels count in DisplayPixelShift */
1088: if ( ( ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask & BORDERMASK_LEFT_OFF_MED )
1089: && ( Res == 0x00 ) && ( LineCycles <= LINE_SCROLL_1_CYCLE_50 ) )
1.1.1.11 root 1090: {
1.1.1.15 root 1091: /* The hi/med switch was a switch to do low res hardware scrolling, */
1092: /* so we must cancel the med res overscan bit. */
1093: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask &= (~BORDERMASK_OVERSCAN_MED_RES);
1.1.1.11 root 1094:
1.1.1.15 root 1095: if ( LineCycles == LINE_SCROLL_13_CYCLE_50 ) /* cycle 20 */
1.1.1.11 root 1096: {
1.1.1.15 root 1097: LOG_TRACE(TRACE_VIDEO_BORDER_H , "detect 13 pixels right scroll\n" );
1098: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayPixelShift = 13;
1.1.1.11 root 1099: }
1.1.1.15 root 1100: else if ( LineCycles == LINE_SCROLL_9_CYCLE_50 ) /* cycle 24 */
1.1.1.11 root 1101: {
1.1.1.15 root 1102: LOG_TRACE(TRACE_VIDEO_BORDER_H , "detect 9 pixels right scroll\n" );
1103: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayPixelShift = 9;
1.1.1.11 root 1104: }
1.1.1.15 root 1105: else if ( LineCycles == LINE_SCROLL_5_CYCLE_50 ) /* cycle 28 */
1.1.1.11 root 1106: {
1.1.1.15 root 1107: LOG_TRACE(TRACE_VIDEO_BORDER_H , "detect 5 pixels right scroll\n" );
1108: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayPixelShift = 5;
1.1.1.11 root 1109: }
1.1.1.15 root 1110: else if ( LineCycles == LINE_SCROLL_1_CYCLE_50 ) /* cycle 32 */
1.1.1.11 root 1111: {
1.1.1.15 root 1112: LOG_TRACE(TRACE_VIDEO_BORDER_H , "detect 1 pixel right scroll\n" );
1113: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayPixelShift = 1;
1.1.1.11 root 1114: }
1115: }
1116:
1.1.1.18 root 1117: #define SCROLL2_4PX
1118: #ifdef SCROLL2_4PX
1119: /* Left border was removed with a hi/lo switch, then a med res switch was made */
1120: /* Depending on the low res switch, the screen will be shifted as a low res overscan line */
1121: /* This is a different method than the one used by ST Connexion with only 3 res switches */
1122: /* (so we must cancel the med res overscan bit) */
1123: if ( ( ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask & BORDERMASK_OVERSCAN_MED_RES )
1124: && ( ( ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask & ( 0xf << 20 ) ) == 0 )
1125: && ( Res == 0x00 ) && ( LineCycles <= 40 ) )
1126: {
1127: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask &= (~BORDERMASK_OVERSCAN_MED_RES); /* cancel mid res */
1128:
1129: if ( LineCycles == 28 )
1130: {
1131: LOG_TRACE(TRACE_VIDEO_BORDER_H , "detect 13 pixels right scroll 2\n" );
1132: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayPixelShift = 13;
1133: }
1134: else if ( LineCycles == 32 )
1135: {
1136: LOG_TRACE(TRACE_VIDEO_BORDER_H , "detect 9 pixels right scroll 2\n" );
1137: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayPixelShift = 9;
1138: }
1139: else if ( LineCycles == 36 )
1140: {
1141: LOG_TRACE(TRACE_VIDEO_BORDER_H , "detect 5 pixels right scroll 2\n" );
1142: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayPixelShift = 5;
1143: }
1144: else if ( LineCycles == 40 )
1145: {
1146: LOG_TRACE(TRACE_VIDEO_BORDER_H , "detect 1 pixel right scroll 2\n" );
1147: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayPixelShift = 1;
1148: }
1149: }
1150: #endif
1151:
1.1.1.15 root 1152:
1153: /* Update HBL's position only if display has not reached pos LINE_START_CYCLE_50 */
1154: /* and HBL interrupt was already handled at the beginning of this line. */
1155: /* This also changes the number of cycles per line. */
1156: if ( ( LineCycles <= LINE_START_CYCLE_50 ) && ( HblCounterVideo == nHBL ) )
1157: {
1158: nCyclesPerLine = Video_HBL_GetPos();
1159: Video_AddInterruptHBL ( nCyclesPerLine );
1160: }
1161:
1162:
1163: /* Update Timer B's position */
1164: LineTimerBCycle = Video_TimerB_GetPos ( HblCounterVideo );
1165: Video_AddInterruptTimerB ( LineTimerBCycle );
1166:
1167:
1168: ShifterFrame.Res = Res;
1169: if ( Res == 0x02 ) /* high res */
1170: {
1171: ShifterFrame.ResPosHi.VBL = nVBLs;
1172: ShifterFrame.ResPosHi.FrameCycles = FrameCycles;
1173: ShifterFrame.ResPosHi.HBL = HblCounterVideo;
1174: ShifterFrame.ResPosHi.LineCycles = LineCycles;
1175: }
1176: else if ( Res == 0x01 ) /* med res */
1177: {
1178: ShifterFrame.ResPosMed.VBL = nVBLs;
1179: ShifterFrame.ResPosMed.FrameCycles = FrameCycles;
1180: ShifterFrame.ResPosMed.HBL = HblCounterVideo;
1181: ShifterFrame.ResPosMed.LineCycles = LineCycles;
1182: }
1183: else /* low res */
1184: {
1185: ShifterFrame.ResPosLo.VBL = nVBLs;
1186: ShifterFrame.ResPosLo.FrameCycles = FrameCycles;
1187: ShifterFrame.ResPosLo.HBL = HblCounterVideo;
1188: ShifterFrame.ResPosLo.LineCycles = LineCycles;
1189: }
1190: }
1191:
1192:
1193:
1194: /*-----------------------------------------------------------------------*/
1195: /**
1196: * Set some default values for DisplayStartCycle/DisplayEndCycle
1197: * when changing frequency in lo/med res (testing orders are important
1198: * because the line can already have some borders changed).
1199: * This is necessary as some freq changes can modify start/end
1200: * even if they're not made at the exact borders' positions.
1201: * These values will be modified later if some borders are changed.
1202: */
1203: static void Video_Sync_SetDefaultStartEnd ( Uint8 Freq , int HblCounterVideo , int LineCycles )
1204: {
1205: if ( Freq == 0x02 ) /* switch to 50 Hz */
1206: {
1207: if ( ( LineCycles <= ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle ) /* start could be 0,52,56 */
1208: && ( ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle == LINE_START_CYCLE_60 ) )
1209: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle = LINE_START_CYCLE_50;
1210:
1211: if ( ( LineCycles <= ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle ) /* end could be 160,372,376,460 */
1212: && ( ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle < LINE_END_CYCLE_50 ) )
1213: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle = LINE_END_CYCLE_50;
1214: }
1215:
1216: else /* switch to 60 Hz */
1217: {
1218: if ( LineCycles < ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle ) /* start could be 0,52,56 */
1219: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle = LINE_START_CYCLE_60;
1220:
1221: if ( ( LineCycles < ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle ) /* end could be 160,372,376,460 */
1222: && ( ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle <= LINE_END_CYCLE_50 ) )
1223: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle = LINE_END_CYCLE_60;
1224: }
1225:
1226: //fprintf ( stderr , "sync default pos %d %d\n", ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
1.1.1.11 root 1227: }
1228:
1229:
1230: /*-----------------------------------------------------------------------*/
1231: /**
1232: * Write to VideoSync (0xff820a), Hz setting
1233: */
1.1.1.15 root 1234: void Video_Sync_WriteByte ( void )
1.1 root 1235: {
1.1.1.15 root 1236: int FrameCycles, HblCounterVideo, LineCycles;
1237: Uint8 Freq;
1.1.1.11 root 1238:
1239:
1.1.1.15 root 1240: if ( bUseVDIRes )
1241: return; /* no 50/60 Hz freq in VDI mode */
1.1.1.11 root 1242:
1243:
1.1.1.15 root 1244: /* We're only interested in bit 1 (50/60Hz) */
1245: Freq = IoMem[0xff820a] & 2;
1.1.1.11 root 1246:
1.1.1.15 root 1247: Video_GetPosition_OnWriteAccess ( &FrameCycles , &HblCounterVideo , &LineCycles );
1248:
1249: 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",
1250: Freq, FrameCycles, LineCycles, nHBL, HblCounterVideo, M68000_GetPC(), CurrentInstrCycles );
1.1.1.11 root 1251:
1.1.1.13 root 1252: /* Ignore consecutive writes of the same value */
1.1.1.15 root 1253: if ( Freq == ShifterFrame.Freq )
1.1.1.13 root 1254: return; /* do nothing */
1255:
1.1.1.15 root 1256: /* Ignore freq changes if we are in high res */
1257: /* 2009/04/26 : don't ignore for now (see ST Cnx in Punish Your Machine) */
1258: // if ( ShifterFrame.Res == 0x02 )
1259: // return; /* do nothing */
1260:
1261: /* Set some default values for DisplayStartCycle/DisplayEndCycle before checking for border removal */
1262: Video_Sync_SetDefaultStartEnd ( Freq , HblCounterVideo , LineCycles );
1263:
1264:
1265: if ( ( ShifterFrame.Freq == 0x00 ) && ( Freq == 0x02 ) /* switched from 60 Hz to 50 Hz ? */
1266: // && ( ShifterFrame.FreqPos60.VBL == nVBLs ) /* switched during the same VBL */
1267: && ( HblCounterVideo >= nStartHBL ) /* only if display is on */
1.1.1.18 root 1268: && ( HblCounterVideo < nEndHBL + BlankLines ) ) /* only if display is on */
1.1.1.15 root 1269: {
1.1.1.18 root 1270: /* Blank line switching freq on STF : switch to 60 Hz on cycle 28, then go back to 50 Hz on cycle 36 */
1271: /* This creates a blank line where no signal is displayed, but the video counter will still change for this line */
1272: /* This blank line can be combined with left/right border changes */
1273: if ( ( FrameCycles - ShifterFrame.FreqPos60.FrameCycles <= 16 )
1274: && ( ShifterFrame.FreqPos60.LineCycles == LINE_EMPTY_CYCLE_71_STF )
1275: && ( ConfigureParams.System.nMachineType == MACHINE_ST ) )
1276: {
1277: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_BLANK_LINE;
1278: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect blank line freq\n" );
1279: }
1280:
1.1.1.15 root 1281: /* Add 2 bytes to left border : switch to 60 Hz before LINE_START_CYCLE_60 to force an early start */
1282: /* of the DE signal, then go back to 50 Hz. Note that depending on where the 50 Hz switch is made */
1283: /* the HBL signal will be at position 508 (60 Hz line) or 512 (50 Hz line) */
1284: /* Obtaining a +2 line with 512 cycles requires a 2 cycles precision and is "wake up" state dependant */
1285: if ( ( ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle == LINE_START_CYCLE_60 )
1286: && ( LineCycles >= LINE_START_CYCLE_50 ) /* The line started in 60 Hz and continues in 50 Hz */
1287: && ( LineCycles <= ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle ) ) /* change when line is active */
1.1.1.11 root 1288: {
1.1.1.15 root 1289: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_LEFT_PLUS_2;
1290: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle = LINE_END_CYCLE_50;
1291: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect left+2 %d<->%d\n" ,
1292: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
1.1.1.11 root 1293: }
1294:
1.1.1.15 root 1295: /* Empty line switching freq : start the line in 50 Hz, change to 60 Hz at the exact place */
1296: /* where display is enabled in 50 Hz, then go back to 50 Hz. */
1297: /* Due to 4 cycles precision instead of 2, we must accept a 60 Hz switch at pos 56 or 56+4 */
1298: else if ( ( FrameCycles - ShifterFrame.FreqPos60.FrameCycles <= 24 )
1299: && ( ( ShifterFrame.FreqPos60.LineCycles == LINE_START_CYCLE_50 ) || ( ShifterFrame.FreqPos60.LineCycles == LINE_START_CYCLE_50+4 ) )
1300: && ( LineCycles > LINE_START_CYCLE_50 ) )
1301: {
1302: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_EMPTY_LINE;
1303: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle = 0;
1304: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle = 0;
1305: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect empty line freq %d<->%d\n" ,
1306: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
1.1.1.11 root 1307: }
1.1.1.15 root 1308:
1309: /* Remove 2 bytes to the right : start the line in 50 Hz (pos 0 or 56), change to 60 Hz before the position */
1310: /* where display is disabled in 60 Hz, then go back to 50 Hz */
1311: if ( ( LineCycles > LINE_END_CYCLE_60 ) /* back to 50 Hz after end of 60 Hz line */
1312: && ( ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle != LINE_START_CYCLE_60 ) /* start could be 0 or 56 */
1313: && ( ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle == LINE_END_CYCLE_60 ) )
1314: {
1315: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_RIGHT_MINUS_2;
1316: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect right-2 %d<->%d\n" ,
1317: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
1318: }
1319:
1.1.1.11 root 1320: }
1321:
1.1.1.15 root 1322:
1323: if ( ( ShifterFrame.Freq == 0x02 && Freq == 0x00 ) /* switched from 50 Hz to 60 Hz ? */
1324: && ( HblCounterVideo >= nStartHBL ) /* only if display is on */
1.1.1.18 root 1325: && ( HblCounterVideo < nEndHBL + BlankLines ) ) /* only if display is on */
1.1.1.15 root 1326: {
1327: /* remove right border, display 44 bytes more : switch to 60 Hz at the position where */
1328: /* the line ends in 50 Hz. Some programs don't switch back to 50 Hz immediatly */
1329: /* (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 */
1330: if ( ( LineCycles == LINE_END_CYCLE_50 )
1331: && ( ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle == LINE_END_CYCLE_50 ) )
1332: {
1333: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_RIGHT_OFF;
1.1.1.16 root 1334: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle = LINE_END_CYCLE_NO_RIGHT;
1.1.1.15 root 1335: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect remove right %d<->%d\n" ,
1336: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
1.1.1.11 root 1337: }
1338: }
1339:
1340:
1341: /* Store cycle position of freq 50/60 to check for top/bottom border removal in Video_EndHBL. */
1.1.1.15 root 1342: if ( Freq == 0x02 ) /* switch to 50 Hz */
1.1.1.11 root 1343: {
1.1.1.13 root 1344: if ( ( HblCounterVideo < VIDEO_START_HBL_50HZ ) /* nStartHBL can change only if display is not ON yet */
1345: && ( OverscanMode & OVERSCANMODE_TOP ) == 0 ) /* update only if top was not removed */
1346: nStartHBL = VIDEO_START_HBL_50HZ;
1.1.1.11 root 1347:
1.1.1.13 root 1348: if ( ( HblCounterVideo < VIDEO_END_HBL_50HZ ) /* nEndHBL can change only if display is not OFF yet */
1.1.1.11 root 1349: && ( OverscanMode & OVERSCANMODE_BOTTOM ) == 0 ) /* update only if bottom was not removed */
1.1.1.13 root 1350: nEndHBL = VIDEO_END_HBL_50HZ; /* 263 */
1.1.1.11 root 1351: }
1.1.1.15 root 1352: else if ( Freq == 0x00 ) /* switch to 60 Hz */
1.1.1.11 root 1353: {
1.1.1.13 root 1354: if ( ( HblCounterVideo < VIDEO_START_HBL_60HZ-1 ) /* nStartHBL can change only if display is not ON yet */
1.1.1.15 root 1355: || ( ( HblCounterVideo == VIDEO_START_HBL_60HZ-1 ) && ( LineCycles <= LineRemoveTopCycle ) ) )
1.1.1.13 root 1356: nStartHBL = VIDEO_START_HBL_60HZ;
1.1.1.11 root 1357:
1.1.1.13 root 1358: if ( ( HblCounterVideo < VIDEO_END_HBL_60HZ ) /* nEndHBL can change only if display is not OFF yet */
1.1.1.11 root 1359: && ( OverscanMode & OVERSCANMODE_BOTTOM ) == 0 ) /* update only if bottom was not removed */
1.1.1.13 root 1360: nEndHBL = VIDEO_END_HBL_60HZ; /* 234 */
1361: }
1362:
1.1.1.15 root 1363:
1.1.1.13 root 1364: /* If the frequence changed, we need to update the EndLine interrupt */
1.1.1.15 root 1365: /* so that it happens 28 cycles after the current DisplayEndCycle.*/
1.1.1.13 root 1366: /* We check if the change affects the current line or the next one. */
1.1.1.15 root 1367: /* We also need to check if the HBL interrupt and nCyclesPerLine need */
1368: /* to be updated first. */
1369: if ( Freq != ShifterFrame.Freq )
1370: {
1371: /* Update HBL's position only if display has not reached pos LINE_START_CYCLE_50 */
1372: /* and HBL interrupt was already handled at the beginning of this line. */
1373: /* This also changes the number of cycles per line. */
1374: if ( ( LineCycles <= LINE_START_CYCLE_50 ) && ( HblCounterVideo == nHBL ) )
1375: {
1376: nCyclesPerLine = Video_HBL_GetPos();
1377: Video_AddInterruptHBL ( nCyclesPerLine );
1378: }
1379:
1380: /* Update Timer B's position */
1381: LineTimerBCycle = Video_TimerB_GetPos ( HblCounterVideo );
1382: Video_AddInterruptTimerB ( LineTimerBCycle );
1383: }
1384:
1385:
1386: ShifterFrame.Freq = Freq;
1387: if ( Freq == 0x02 ) /* 50 Hz */
1388: {
1389: ShifterFrame.FreqPos50.VBL = nVBLs;
1390: ShifterFrame.FreqPos50.FrameCycles = FrameCycles;
1391: ShifterFrame.FreqPos50.HBL = HblCounterVideo;
1392: ShifterFrame.FreqPos50.LineCycles = LineCycles;
1393: }
1394: else
1395: {
1396: ShifterFrame.FreqPos60.VBL = nVBLs;
1397: ShifterFrame.FreqPos60.FrameCycles = FrameCycles;
1398: ShifterFrame.FreqPos60.HBL = HblCounterVideo;
1399: ShifterFrame.FreqPos60.LineCycles = LineCycles;
1400: }
1401: }
1402:
1403:
1404: /*-----------------------------------------------------------------------*/
1405: /**
1406: * Compute the cycle position where the HBL should happen on each line.
1407: * In low/med res, the position depends on the video frequency (50/60 Hz)
1408: * In high res, the position is always the same.
1409: * This position also gives the number of CPU cycles per video line.
1410: */
1411: static int Video_HBL_GetPos ( void )
1412: {
1413: int Pos;
1414:
1415: if ( ( IoMem_ReadByte ( 0xff8260 ) & 3 ) == 2 ) /* hi res */
1416: Pos = CYCLES_PER_LINE_71HZ;
1417:
1418: else /* low res or med res */
1419: {
1420: if ( IoMem_ReadByte ( 0xff820a ) & 2 ) /* 50 Hz, pos 512 */
1421: Pos = CYCLES_PER_LINE_50HZ;
1422: else /* 60 Hz, pos 508 */
1423: Pos = CYCLES_PER_LINE_60HZ;
1424: }
1425:
1426: return Pos;
1427: }
1428:
1429:
1430: /*-----------------------------------------------------------------------*/
1431: /**
1432: * Compute the cycle position where the timer B should happen on each
1433: * visible line.
1434: * We compute Timer B position for the given LineNumber, using start/end
1435: * display cycles from ShifterLines[ LineNumber ].
1436: * The position depends on the start of line / end of line positions
1437: * (which depend on the current frequency / border tricks) and
1438: * on the value of the bit 3 in the MFP's AER.
1439: * If bit is 0, timer B will count end of line events (usual case),
1440: * but if bit is 1, timer B will count start of line events (eg Seven Gates Of Jambala)
1441: */
1442: int Video_TimerB_GetPos ( int LineNumber )
1443: {
1444: int Pos;
1445:
1446: if ( ( IoMem[0xfffa03] & ( 1 << 3 ) ) == 0 ) /* we're counting end of line events */
1447: {
1448: Pos = ShifterFrame.ShifterLines[ LineNumber ].DisplayEndCycle + TIMERB_VIDEO_CYCLE_OFFSET;
1449: }
1450: else /* we're counting start of line events */
1451: {
1452: Pos = ShifterFrame.ShifterLines[ LineNumber ].DisplayStartCycle + TIMERB_VIDEO_CYCLE_OFFSET;
1453: }
1454:
1.1.1.18 root 1455: //fprintf ( stderr , "timerb pos=%d\n" , Pos );
1456: return Pos;
1457: }
1458:
1459:
1460: /*-----------------------------------------------------------------------*/
1461: /**
1462: * Compute the default cycle position where the timer B should happen
1463: * on the next line, when restarting the INTERRUPT_VIDEO_ENDLINE handler.
1464: * In low/med res, the position depends on the video frequency (50/60 Hz)
1465: * In high res, the position is always the same.
1466: */
1467: int Video_TimerB_GetDefaultPos ( void )
1468: {
1469: int Pos;
1470:
1471: if ( ( IoMem[0xfffa03] & ( 1 << 3 ) ) == 0 ) /* we're counting end of line events */
1472: {
1473: if ( ( IoMem_ReadByte ( 0xff8260 ) & 3 ) == 2 ) /* hi res */
1474: Pos = LINE_END_CYCLE_71;
1475:
1476: else /* low res or med res */
1477: {
1478: if ( IoMem_ReadByte ( 0xff820a ) & 2 ) /* 50 Hz, pos 376 */
1479: Pos = LINE_END_CYCLE_50;
1480: else /* 60 Hz, pos 372 */
1481: Pos = LINE_END_CYCLE_60;
1482: }
1483: }
1484: else /* we're counting start of line events */
1485: {
1486: if ( ( IoMem_ReadByte ( 0xff8260 ) & 3 ) == 2 ) /* hi res */
1487: Pos = LINE_START_CYCLE_71;
1488:
1489: else /* low res or med res */
1490: {
1491: if ( IoMem_ReadByte ( 0xff820a ) & 2 ) /* 50 Hz, pos 56 */
1492: Pos = LINE_START_CYCLE_50;
1493: else /* 60 Hz, pos 52 */
1494: Pos = LINE_START_CYCLE_60;
1495: }
1496: }
1497:
1498: Pos += TIMERB_VIDEO_CYCLE_OFFSET;
1499:
1500: //fprintf ( stderr , "timerb default pos=%d\n" , Pos );
1.1.1.15 root 1501: return Pos;
1502: }
1503:
1504:
1505: /*-----------------------------------------------------------------------*/
1506: /**
1507: * HBL interrupt : this occurs at the end of every line, on cycle 512 (in 50 Hz)
1508: * It takes 56 cycles to handle the 68000's exception.
1509: */
1510: void Video_InterruptHandler_HBL ( void )
1511: {
1512: int FrameCycles = Cycles_GetCounter(CYCLES_COUNTER_VIDEO);
1513: int PendingCyclesOver;
1514: int NewHBLPos;
1515:
1516: /* How many cycle was this HBL delayed (>= 0) */
1517: PendingCyclesOver = -INT_CONVERT_FROM_INTERNAL ( PendingInterruptCount , INT_CPU_CYCLE );
1518:
1519: /* Remove this interrupt from list and re-order */
1.1.1.16 root 1520: CycInt_AcknowledgeInterrupt();
1.1.1.15 root 1521:
1.1.1.17 root 1522: /* Videl Vertical counter increment (To be removed when Videl emulation is finished) */
1523: /* VFC is incremented every half line, here, we increment it every line (should be completed) */
1524: if (ConfigureParams.System.nMachineType == MACHINE_FALCON) {
1525: vfc_counter += 1;
1526: }
1527:
1528:
1.1.1.15 root 1529: /* Increment the hbl jitter index */
1530: HblJitterIndex++;
1531: if ( HblJitterIndex == HBL_JITTER_MAX_POS )
1532: HblJitterIndex = 0;
1533:
1534: LOG_TRACE ( TRACE_VIDEO_HBL , "HBL %d video_cyc=%d pending_cyc=%d jitter=%d\n" ,
1535: nHBL , FrameCycles , PendingCyclesOver , HblJitterArray[ HblJitterIndex ] );
1536:
1537: /* Default cycle position for next HBL */
1538: NewHBLPos = Video_HBL_GetPos();
1539:
1540: /* Generate new HBL, if need to - there are 313 HBLs per frame in 50 Hz */
1541: if (nHBL < nScanlinesPerFrame-1)
1542: Video_AddInterruptHBL ( NewHBLPos );
1543:
1544:
1545: /* We must handle a very special case : if we had a pending HBL that becomes active */
1546: /* because SR is now <= $2100, then we must process an exception for this pending HBL. */
1547: /* But if a "real" (non pending) HBL occurs during the first 56 cycles needed by the */
1548: /* CPU to prepare the exception, we must ignore this HBL signal (instead of considering */
1549: /* this new HBL should be put in pending state to be processed later) */
1550: /* -> any HBL occuring between LastCycleHblException and LastCycleHblException+56 should be ignored */
1551: if ( ( LastCycleHblException != -1 )
1.1.1.17 root 1552: && ( ( FrameCycles - PendingCyclesOver - HblJitterArray[ HblJitterIndex ] ) - LastCycleHblException <= 56 )
1553: && ( ( M68000_GetPC() < 0x8280 ) || ( M68000_GetPC() > 0x82b0 ) ) ) /* FIXME : except for European Demos intro where 8280<pc<82b0 */
1.1.1.15 root 1554: {
1555: /* simultaneous case, don't call M68000_Exception */
1556: LOG_TRACE ( TRACE_VIDEO_HBL , "HBL %d video_cyc=%d signal ignored during pending hbl exception at cycle %d\n" ,
1557: nHBL , Cycles_GetCounter(CYCLES_COUNTER_VIDEO) , LastCycleHblException );
1558: LastCycleHblException = -1;
1559: }
1560: else
1561: {
1562: /* "normal" case, this HBL doesn't occur during the processing of a pending HBL */
1.1.1.16 root 1563: M68000_Exception(EXCEPTION_HBLANK , M68000_EXC_SRC_AUTOVEC); /* Horizontal blank interrupt, level 2! */
1.1.1.15 root 1564: }
1565:
1566:
1567: Video_EndHBL(); /* Check some borders removal and copy line to display buffer */
1568:
1.1.1.17 root 1569: DmaSnd_STE_HBL_Update(); /* Update STE DMA sound if needed */
1570:
1.1.1.15 root 1571: nHBL++; /* Increase HBL count */
1572:
1573: if (nHBL < nScanlinesPerFrame)
1574: {
1575: /* Update start cycle for next HBL */
1576: ShifterFrame.ShifterLines[ nHBL ].StartCycle = FrameCycles - PendingCyclesOver;
1577: LOG_TRACE(TRACE_VIDEO_HBL, "HBL %d start=%d %x\n", nHBL,
1578: ShifterFrame.ShifterLines[nHBL].StartCycle, ShifterFrame.ShifterLines[nHBL].StartCycle);
1579:
1580: /* Setup next HBL */
1581: Video_StartHBL();
1582: }
1583: }
1584:
1585:
1586: /*-----------------------------------------------------------------------*/
1587: /**
1588: * Check at end of each HBL to see if any Shifter hardware tricks have been attempted
1589: * and copy the line to the screen buffer.
1590: * This is the place to check if top/bottom border were removed, as well as if some
1591: * left/right border changes were not validated before.
1592: * NOTE : the tests must be made with nHBL in ascending order.
1593: */
1594: static void Video_EndHBL(void)
1595: {
1596: //
1597: // Handle top/bottom borders removal when switching freq
1598: //
1599:
1600: /* Remove top border if the switch to 60 Hz was made during this vbl before cycle */
1601: /* LineRemoveTopCycle on line 33 and if the switch to 50 Hz has not yet occured or */
1602: /* occured before the 60 Hz or occured after cycle LineRemoveTopCycle on line 33. */
1603: if ( ( nHBL == VIDEO_START_HBL_60HZ-1 ) /* last HBL before first line of a 60 Hz screen */
1604: && ( ShifterFrame.FreqPos60.VBL == nVBLs ) /* switch to 60 Hz during this VBL */
1605: && ( ( ShifterFrame.FreqPos60.HBL < nHBL ) || ( ShifterFrame.FreqPos60.LineCycles <= LineRemoveTopCycle ) )
1606: && ( ( ShifterFrame.FreqPos50.VBL < nVBLs )
1607: || ( ShifterFrame.FreqPos50.FrameCycles < ShifterFrame.FreqPos60.FrameCycles )
1608: || ( ShifterFrame.FreqPos50.HBL > nHBL )
1609: || ( ( ShifterFrame.FreqPos50.HBL == nHBL ) && ( ShifterFrame.FreqPos50.LineCycles > LineRemoveTopCycle ) ) ) )
1610: {
1611: /* Top border */
1612: LOG_TRACE ( TRACE_VIDEO_BORDER_V , "detect remove top\n" );
1613: OverscanMode |= OVERSCANMODE_TOP; /* Set overscan bit */
1614: nStartHBL = VIDEO_START_HBL_60HZ; /* New start screen line */
1615: pHBLPaletteMasks -= OVERSCAN_TOP; // FIXME useless ?
1616: pHBLPalettes -= OVERSCAN_TOP; // FIXME useless ?
1617: }
1618:
1619: /* Remove bottom border for a 60 Hz screen (tests are similar to the ones for top border) */
1.1.1.18 root 1620: else if ( ( nHBL == VIDEO_END_HBL_60HZ + BlankLines - 1 ) /* last displayed line in 60 Hz */
1.1.1.15 root 1621: && ( nStartHBL == VIDEO_START_HBL_60HZ ) /* screen started in 60 Hz */
1622: && ( ( OverscanMode & OVERSCANMODE_TOP ) == 0 ) /* and top border was not removed : this screen is only 60 Hz */
1623: && ( ShifterFrame.FreqPos50.VBL == nVBLs ) /* switch to 50 Hz during this VBL */
1624: && ( ( ShifterFrame.FreqPos50.HBL < nHBL ) || ( ShifterFrame.FreqPos50.LineCycles <= LineRemoveBottomCycle ) )
1625: && ( ( ShifterFrame.FreqPos60.VBL < nVBLs )
1626: || ( ShifterFrame.FreqPos60.FrameCycles < ShifterFrame.FreqPos50.FrameCycles )
1627: || ( ShifterFrame.FreqPos60.HBL > nHBL )
1628: || ( ( ShifterFrame.FreqPos60.HBL == nHBL ) && ( ShifterFrame.FreqPos60.LineCycles > LineRemoveBottomCycle ) ) ) )
1629: {
1630: LOG_TRACE ( TRACE_VIDEO_BORDER_V , "detect remove bottom 60Hz\n" );
1631: OverscanMode |= OVERSCANMODE_BOTTOM;
1632: nEndHBL = SCANLINES_PER_FRAME_60HZ; /* new end for a 60 Hz screen */
1633: }
1634:
1635: /* Remove bottom border for a 50 Hz screen (tests are similar to the ones for top border) */
1.1.1.18 root 1636: else if ( ( nHBL == VIDEO_END_HBL_50HZ + BlankLines - 1 ) /* last displayed line in 50 Hz */
1.1.1.15 root 1637: && ( ( OverscanMode & OVERSCANMODE_BOTTOM ) == 0 ) /* border was not already removed at line VIDEO_END_HBL_60HZ-1 */
1638: && ( ShifterFrame.FreqPos60.VBL == nVBLs ) /* switch to 60 Hz during this VBL */
1639: && ( ( ShifterFrame.FreqPos60.HBL < nHBL ) || ( ShifterFrame.FreqPos60.LineCycles <= LineRemoveBottomCycle ) )
1640: && ( ( ShifterFrame.FreqPos50.VBL < nVBLs )
1641: || ( ShifterFrame.FreqPos50.FrameCycles < ShifterFrame.FreqPos60.FrameCycles )
1642: || ( ShifterFrame.FreqPos50.HBL > nHBL )
1643: || ( ( ShifterFrame.FreqPos50.HBL == nHBL ) && ( ShifterFrame.FreqPos50.LineCycles > LineRemoveBottomCycle ) ) ) )
1.1.1.13 root 1644: {
1.1.1.15 root 1645: LOG_TRACE ( TRACE_VIDEO_BORDER_V , "detect remove bottom\n" );
1646: OverscanMode |= OVERSCANMODE_BOTTOM;
1647: nEndHBL = VIDEO_END_HBL_50HZ+VIDEO_HEIGHT_BOTTOM_50HZ; /* new end for a 50 Hz screen */
1648: }
1649:
1650:
1651: //
1652: // Check some left/right borders effects that were not detected earlier
1653: // (this is usually due to staying in 60 Hz for too long, which is often a bad
1654: // coding practice as it can distort the display on a real ST)
1655: //
1656:
1657: /* Special case when the line was not started in 60 Hz, then switched to 60 Hz */
1658: /* and was not restored to 50 Hz before the end of the line. In that case, the */
1659: /* line ends 2 bytes earlier on the right (line can start at LINE_START_CYCLE_71/50) */
1660: /* Some programs also turn to 60 Hz too early during the active display of the last */
1661: /* line to remove the bottom border (FNIL by TNT), in that case, we should also remove */
1662: /* 2 bytes to this line */
1663: if ( ( ( ShifterFrame.ShifterLines[ nHBL ].BorderMask & BORDERMASK_RIGHT_MINUS_2 ) == 0 )
1664: && ( ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle != LINE_START_CYCLE_60 ) /* start could be 0 or 56 */
1665: && ( ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle == LINE_END_CYCLE_60 ) )
1666: {
1667: ShifterFrame.ShifterLines[ nHBL ].BorderMask |= BORDERMASK_RIGHT_MINUS_2;
1668: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect late right-2 %d<->%d\n" ,
1669: ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle , ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle );
1670: }
1671:
1672:
1673: /* Similar case when line started in 60 Hz but did not end at the usual LINE_END_CYCLE_60 position */
1674: /* (line can end at LINE_END_CYCLE_71/50 or have right border removed) */
1675: /* This means left border had 2 bytes more to display */
1676: if ( ( ( ShifterFrame.ShifterLines[ nHBL ].BorderMask & BORDERMASK_LEFT_PLUS_2 ) == 0 )
1677: && ( ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle == LINE_START_CYCLE_60 )
1678: && ( ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle != LINE_END_CYCLE_60 ) ) /* end could be 160, 372 or 460 */
1679: {
1680: ShifterFrame.ShifterLines[ nHBL ].BorderMask |= BORDERMASK_LEFT_PLUS_2;
1681: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect late left+2 %d<->%d\n" ,
1682: ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle , ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle );
1683: }
1684:
1685:
1686: /* Although a 'left+2' was detected earlier, the freq was switched back to 60 Hz during DE, so the line is just */
1687: /* a normal 60 Hz line ; we must cancel the 'left+2' flag */
1688: else if ( ( ShifterFrame.ShifterLines[ nHBL ].BorderMask & BORDERMASK_LEFT_PLUS_2 )
1689: && ( ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle == LINE_END_CYCLE_60 ) )
1690: {
1691: ShifterFrame.ShifterLines[ nHBL ].BorderMask &= ~BORDERMASK_LEFT_PLUS_2;
1692: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "cancel late left+2 %d<->%d\n" ,
1693: ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle , ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle );
1694: }
1695:
1696:
1.1.1.13 root 1697:
1.1.1.15 root 1698: /* Store palette for very first line on screen - HBLPalettes[0] */
1699: if (nHBL == nFirstVisibleHbl-1)
1700: {
1701: /* Store ALL palette for this line into raster table for datum */
1702: Video_StoreFirstLinePalette();
1703: }
1704:
1705: if (bUseHighRes)
1706: {
1707: /* Copy for hi-res (no overscan) */
1708: if (nHBL >= nFirstVisibleHbl && nHBL < nLastVisibleHbl)
1709: Video_CopyScreenLineMono();
1710: }
1711: /* Are we in possible visible color display (including borders)? */
1712: else if (nHBL >= nFirstVisibleHbl && nHBL < nLastVisibleHbl)
1713: {
1714: /* Store resolution for every line so can check for mix low/med screens */
1715: Video_StoreResolution(nHBL-nFirstVisibleHbl);
1716:
1717: /* Copy line of screen to buffer to simulate TV raster trace
1718: * - required for mouse cursor display/game updates
1719: * Eg, Lemmings and The Killing Game Show are good examples */
1720: Video_CopyScreenLineColor();
1721: }
1722: }
1723:
1724:
1725: /*-----------------------------------------------------------------------*/
1726: /**
1727: * Set default values for the next HBL, depending on the current res/freq.
1728: * We set the number of cycles per line, as well as some default values
1729: * for display start/end cycle.
1730: */
1731: static void Video_StartHBL(void)
1732: {
1.1.1.19! root 1733: if ((IoMem_ReadByte(0xff8260) & 3) == 2) /* hi res */
1.1.1.15 root 1734: {
1735: nCyclesPerLine = CYCLES_PER_LINE_71HZ;
1736: ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle = LINE_START_CYCLE_71;
1737: ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle = LINE_END_CYCLE_71;
1738: }
1739: else
1740: {
1741: if ( IoMem_ReadByte ( 0xff820a ) & 2 ) /* 50 Hz */
1742: {
1743: nCyclesPerLine = CYCLES_PER_LINE_50HZ;
1744: if ( ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle == -1 ) /* start not set yet */
1745: ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle = LINE_START_CYCLE_50;
1746: ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle = LINE_END_CYCLE_50;
1747: }
1748: else /* 60 Hz */
1749: {
1750: nCyclesPerLine = CYCLES_PER_LINE_60HZ;
1751: if ( ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle == -1 ) /* start not set yet */
1752: ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle = LINE_START_CYCLE_60;
1753: ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle = LINE_END_CYCLE_60;
1754: }
1755: }
1756: }
1757:
1758:
1759: /*-----------------------------------------------------------------------*/
1760: /**
1761: * End Of Line interrupt
1762: * This interrupt is started on cycle position 404 in 50 Hz and on cycle
1763: * position 400 in 60 Hz. 50 Hz display ends at cycle 376 and 60 Hz displays
1764: * ends at cycle 372. This means the EndLine interrupt happens 28 cycles
1765: * after DisplayEndCycle.
1766: * Note that if bit 3 of MFP AER is 1, then timer B will count start of line
1767: * instead of end of line (at cycle 52+28 or 56+28)
1768: */
1769: void Video_InterruptHandler_EndLine(void)
1770: {
1771: int FrameCycles, HblCounterVideo, LineCycles;
1772: int PendingCycles = -INT_CONVERT_FROM_INTERNAL ( PendingInterruptCount , INT_CPU_CYCLE );
1773:
1774: Video_GetPosition ( &FrameCycles , &HblCounterVideo , &LineCycles );
1775:
1776: LOG_TRACE ( TRACE_VIDEO_HBL , "EndLine TB %d video_cyc=%d line_cyc=%d pending_int_cnt=%d\n" ,
1777: nHBL , FrameCycles , LineCycles , PendingCycles );
1778:
1779: /* Remove this interrupt from list and re-order */
1.1.1.16 root 1780: CycInt_AcknowledgeInterrupt();
1.1.1.15 root 1781:
1782: /* Ignore HBLs in VDI mode */
1783: if (bUseVDIRes)
1784: return;
1785:
1786: /* Generate new Endline, if need to - there are 313 HBLs per frame */
1787: if (nHBL < nScanlinesPerFrame-1)
1788: {
1789: /* By default, next EndLine's int will be on line nHBL+1 at pos 376+28 or 372+28 */
1790: if ( ( IoMem[0xfffa03] & ( 1 << 3 ) ) == 0 ) /* count end of line */
1.1.1.13 root 1791: {
1.1.1.15 root 1792: /* If EndLine int is delayed too much (more than 100 cycles), nLineCycles will */
1793: /* be in the range 0..xxx instead of 400..512. In that case, we need to add */
1794: /* nCyclesPerLine to be in the range 512..x+512 */
1795: /* Maximum possible delay should be around 160 cycles on STF (DIVS) */
1796: /* In that case, HBL int will be delayed too, so we will have HblCounterVideo == nHBL+1 */
1797: if ( HblCounterVideo == nHBL+1 ) /* int happened in fact on the next line nHBL+1 */
1798: LineCycles += nCyclesPerLine;
1.1.1.13 root 1799:
1.1.1.18 root 1800: LineTimerBCycle = Video_TimerB_GetDefaultPos ();
1.1.1.13 root 1801: }
1802:
1.1.1.15 root 1803: else /* count start of line, no possible delay to handle */
1.1.1.13 root 1804: {
1.1.1.18 root 1805: LineTimerBCycle = Video_TimerB_GetDefaultPos ();
1.1.1.13 root 1806: }
1807:
1.1.1.15 root 1808: //fprintf ( stderr , "new tb %d %d %d\n" , LineTimerBCycle , nCyclesPerLine , LineTimerBCycle - LineCycles + nCyclesPerLine );
1.1.1.16 root 1809: CycInt_AddRelativeInterrupt ( LineTimerBCycle - LineCycles + nCyclesPerLine,
1.1.1.15 root 1810: INT_CPU_CYCLE, INTERRUPT_VIDEO_ENDLINE );
1.1.1.11 root 1811: }
1812:
1.1.1.15 root 1813: /* Timer B occurs at END of first visible screen line in Event Count mode */
1.1.1.18 root 1814: if ( ( nHBL >= nStartHBL ) && ( nHBL < nEndHBL + BlankLines ) )
1.1.1.11 root 1815: {
1.1.1.15 root 1816: /* Handle Timer B when using Event Count mode */
1817: /* We must ensure that the write to fffa1b to activate timer B was */
1818: /* completed before the point where the end of line signal was generated */
1819: /* (in the case of a move.b #8,$fffa1b that would happen 4 cycles */
1820: /* before end of line, the interrupt should not be generated) */
1821: if ( (MFP_TBCR == 0x08) /* Is timer in Event Count mode ? */
1822: && ( ( TimerBEventCountCycleStart == -1 ) /* timer B was started during a previous VBL */
1823: || ( TimerBEventCountCycleStart < FrameCycles-PendingCycles ) ) ) /* timer B was started before this possible interrupt */
1824: MFP_TimerB_EventCount_Interrupt(); /* we have a valid timer B interrupt */
1.1.1.11 root 1825: }
1.1 root 1826: }
1827:
1.1.1.2 root 1828:
1.1.1.15 root 1829:
1830:
1.1.1.2 root 1831: /*-----------------------------------------------------------------------*/
1.1.1.11 root 1832: /**
1833: * Store whole palette on first line so have reference to work from
1834: */
1.1.1.7 root 1835: static void Video_StoreFirstLinePalette(void)
1.1 root 1836: {
1.1.1.11 root 1837: Uint16 *pp2;
1838: int i;
1839:
1840: pp2 = (Uint16 *)&IoMem[0xff8240];
1841: for (i = 0; i < 16; i++)
1842: HBLPalettes[i] = SDL_SwapBE16(*pp2++);
1.1 root 1843:
1.1.1.11 root 1844: /* And set mask flag with palette and resolution */
1845: // FIXME ; enlever PALETTEMASK_RESOLUTION
1846:
1.1.1.15 root 1847: // if ( ShifterFrame.ShifterLines[ nFirstVisibleHbl ].BorderMask == BORDERMASK_NONE ) // no border trick, store the current res
1.1.1.11 root 1848: HBLPaletteMasks[0] = (PALETTEMASK_RESOLUTION|PALETTEMASK_PALETTE) | (((Uint32)IoMem_ReadByte(0xff8260)&0x3)<<16);
1849: // else // border removal, assume low res for the whole line
1850: // HBLPaletteMasks[0] = (PALETTEMASK_RESOLUTION|PALETTEMASK_PALETTE) | (0<<16);
1.1 root 1851: }
1852:
1.1.1.2 root 1853:
1854: /*-----------------------------------------------------------------------*/
1.1.1.11 root 1855: /**
1856: * Store resolution on each line (used to test if mixed low/medium resolutions)
1857: */
1.1.1.7 root 1858: static void Video_StoreResolution(int y)
1.1 root 1859: {
1.1.1.11 root 1860: Uint8 res;
1861: int Mask;
1.1 root 1862:
1.1.1.11 root 1863: /* Clear resolution, and set with current value */
1864: if (!(bUseHighRes || bUseVDIRes))
1865: {
1866: HBLPaletteMasks[y] &= ~(0x3<<16);
1867: res = IoMem_ReadByte(0xff8260)&0x3;
1868:
1.1.1.15 root 1869: Mask = ShifterFrame.ShifterLines[ y+nFirstVisibleHbl ].BorderMask;
1.1.1.11 root 1870:
1.1.1.15 root 1871: if ( Mask & BORDERMASK_OVERSCAN_MED_RES ) /* special case for med res to render the overscan line */
1872: res = 1; /* med res instead of low res */
1.1.1.11 root 1873: else if ( Mask != BORDERMASK_NONE ) /* border removal : assume low res for the whole line */
1874: res = 0;
1.1.1.2 root 1875:
1.1.1.11 root 1876: HBLPaletteMasks[y] |= PALETTEMASK_RESOLUTION|((Uint32)res)<<16;
1877:
1878: #if 0
1879: if ( ( Mask == BORDERMASK_NONE ) /* no border trick, store the current res */
1880: || ( res == 0 ) || ( res == 1 ) ) /* if border trick, ignore passage to hi res */
1881: HBLPaletteMasks[y] |= PALETTEMASK_RESOLUTION|((Uint32)res)<<16;
1882: else /* border removal or hi res : assume low res for the whole line */
1883: HBLPaletteMasks[y] |= (0)<<16;
1884:
1.1.1.15 root 1885: /* special case for med res to render the overscan line */
1886: if ( Mask & BORDERMASK_OVERSCAN_MED_RES )
1887: HBLPaletteMasks[y] |= PALETTEMASK_RESOLUTION|((Uint32)1)<<16; /* med res instead of low res */
1.1.1.11 root 1888: #endif
1.1 root 1889:
1.1.1.11 root 1890: // fprintf ( stderr , "store res %d line %d %x %x\n" , res , y , Mask , HBLPaletteMasks[y] );
1891: }
1.1.1.9 root 1892: }
1893:
1894:
1895: /*-----------------------------------------------------------------------*/
1.1.1.11 root 1896: /**
1897: * Copy one line of monochrome screen into buffer for conversion later.
1898: */
1899: static void Video_CopyScreenLineMono(void)
1900: {
1901: /* Copy one line - 80 bytes in ST high resolution */
1902: memcpy(pSTScreen, pVideoRaster, SCREENBYTES_MONOLINE);
1903: pVideoRaster += SCREENBYTES_MONOLINE;
1904:
1905: /* Handle STE fine scrolling (HWScrollCount is zero on ST). */
1906: if (HWScrollCount)
1907: {
1908: Uint16 *pScrollAdj;
1909: int nNegScrollCnt;
1910:
1911: pScrollAdj = (Uint16 *)pSTScreen;
1912: nNegScrollCnt = 16 - HWScrollCount;
1913:
1914: /* Shift the whole line by the given scroll count */
1915: while ((Uint8*)pScrollAdj < pSTScreen + SCREENBYTES_MONOLINE-2)
1916: {
1917: do_put_mem_word(pScrollAdj, (do_get_mem_word(pScrollAdj) << HWScrollCount)
1918: | (do_get_mem_word(pScrollAdj+1) >> nNegScrollCnt));
1919: ++pScrollAdj;
1920: }
1921:
1922: /* Handle the last 16 pixels of the line */
1923: do_put_mem_word(pScrollAdj, (do_get_mem_word(pScrollAdj) << HWScrollCount)
1924: | (do_get_mem_word(pVideoRaster) >> nNegScrollCnt));
1925:
1926: /* HW scrolling advances Shifter video counter by one */
1927: pVideoRaster += 1 * 2;
1928: }
1929:
1930: /* LineWidth is zero on ST. */
1931: /* On STE, the Shifter skips the given amount of words. */
1932: pVideoRaster += LineWidth*2;
1933:
1934: /* On STE, handle modifications of the video counter address $ff8205/07/09 */
1935: /* that occurred while the display was already ON */
1.1.1.16 root 1936: if ( VideoCounterDelayedOffset != 0 )
1.1.1.11 root 1937: {
1.1.1.16 root 1938: pVideoRaster += ( VideoCounterDelayedOffset & ~1 );
1939: VideoCounterDelayedOffset = 0;
1.1.1.11 root 1940: }
1.1.1.16 root 1941:
1942: if ( pVideoRasterDelayed != NULL )
1.1.1.11 root 1943: {
1.1.1.16 root 1944: pVideoRaster = pVideoRasterDelayed;
1945: pVideoRasterDelayed = NULL;
1.1.1.11 root 1946: }
1947:
1948: /* On STE, if we wrote to the hwscroll register, we set the */
1949: /* new value here, once the current line was processed */
1950: if ( NewHWScrollCount >= 0 )
1951: {
1952: HWScrollCount = NewHWScrollCount;
1953: NewHWScrollCount = -1;
1954: }
1955:
1956: /* On STE, if we wrote to the linewidth register, we set the */
1957: /* new value here, once the current line was processed */
1958: if ( NewLineWidth >= 0 )
1959: {
1960: LineWidth = NewLineWidth;
1961: NewLineWidth = -1;
1962: }
1963:
1964: /* Each screen line copied to buffer is always same length */
1965: pSTScreen += SCREENBYTES_MONOLINE;
1966: }
1967:
1968:
1969: /*-----------------------------------------------------------------------*/
1970: /**
1971: * Copy one line of color screen into buffer for conversion later.
1972: * Possible lines may be top/bottom border, and/or left/right borders.
1973: */
1.1.1.9 root 1974: static void Video_CopyScreenLineColor(void)
1975: {
1.1.1.15 root 1976: int LineBorderMask;
1.1.1.11 root 1977: int VideoOffset = 0;
1978: int STF_PixelScroll = 0;
1.1.1.14 root 1979: int LineRes;
1.1.1.17 root 1980: Uint8 *pVideoRasterEndLine; /* addr of the last byte copied from pVideoRaster to pSTScreen (for HWScrollCount) */
1981: int i;
1.1.1.14 root 1982:
1.1.1.15 root 1983: LineBorderMask = ShifterFrame.ShifterLines[ nHBL ].BorderMask;
1.1.1.16 root 1984: STF_PixelScroll = ShifterFrame.ShifterLines[ nHBL ].DisplayPixelShift;
1.1.1.15 root 1985:
1986: /* Get resolution for this line (in case of mixed low/med screen) */
1987: LineRes = ( HBLPaletteMasks[nHBL-nFirstVisibleHbl] >> 16 ) & 1; /* 0=low res 1=med res */
1.1.1.11 root 1988:
1.1.1.16 root 1989: //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 1990:
1991: /* If left border is opened, we need to compensate one missing word in low res (1 plan) */
1.1.1.15 root 1992: /* If overscan is in med res, the offset is variable */
1993: if ( LineBorderMask & BORDERMASK_OVERSCAN_MED_RES )
1994: VideoOffset = - ( ( LineBorderMask >> 20 ) & 0x0f ); /* No Cooper=0 PYM=-2 in med res overscan */
1.1.1.11 root 1995:
1996: else if ( LineBorderMask & BORDERMASK_LEFT_OFF )
1.1.1.18 root 1997: {
1998: #ifdef SCROLL2_4PX
1999: int ShiftPixels = 0;
2000:
2001: if ( STF_PixelScroll == 13 ) { VideoOffset = 2; ShiftPixels = 8; }
2002: else if ( STF_PixelScroll == 9 ) { VideoOffset = 0; ShiftPixels = 8; }
2003: else if ( STF_PixelScroll == 5 ) { VideoOffset = -2; ShiftPixels = 8; }
2004: else if ( STF_PixelScroll == 1 ) { VideoOffset = -4; ShiftPixels = 8; }
2005:
2006: else VideoOffset = -2; /* Normal low res left border removal without 4 pixels scrolling */
2007:
2008: STF_PixelScroll -= ShiftPixels;
2009: #else
1.1.1.14 root 2010: VideoOffset = -2; /* always 2 bytes in low res overscan */
1.1.1.18 root 2011: #endif
2012: }
1.1.1.11 root 2013:
1.1.1.16 root 2014: else if ( LineBorderMask & BORDERMASK_LEFT_OFF_2_STE )
2015: VideoOffset = -4; /* 4 first bytes of the line are not shown */
2016:
1.1.1.11 root 2017: /* Handle 4 pixels hardware scrolling ('ST Cnx' demo in 'Punish Your Machine') */
2018: /* Depending on the number of pixels, we need to compensate for some skipped words */
1.1.1.15 root 2019: else if ( LineBorderMask & BORDERMASK_LEFT_OFF_MED )
1.1.1.11 root 2020: {
1.1.1.16 root 2021: if ( STF_PixelScroll == 13 ) VideoOffset = 2;
2022: else if ( STF_PixelScroll == 9 ) VideoOffset = 0;
2023: else if ( STF_PixelScroll == 5 ) VideoOffset = -2;
2024: else if ( STF_PixelScroll == 1 ) VideoOffset = -4;
1.1.1.11 root 2025: else VideoOffset = 0; /* never used ? */
2026:
1.1.1.16 root 2027: STF_PixelScroll -= 8; /* removing left border in mid res also shifts display to the left */
1.1.1.11 root 2028: // fprintf(stderr , "scr off %d %d\n" , STF_PixelScroll , VideoOffset);
2029: }
2030:
1.1.1.13 root 2031:
1.1.1.11 root 2032: /* Is total blank line? I.e. top/bottom border? */
1.1.1.18 root 2033: if ((nHBL < nStartHBL) || (nHBL >= nEndHBL + BlankLines)
1.1.1.15 root 2034: || (LineBorderMask & BORDERMASK_EMPTY_LINE))
1.1.1.11 root 2035: {
2036: /* Clear line to color '0' */
2037: memset(pSTScreen, 0, SCREENBYTES_LINE);
2038: }
2039: else
2040: {
1.1.1.18 root 2041: /* Does have left border ? */
1.1.1.16 root 2042: if ( LineBorderMask & ( BORDERMASK_LEFT_OFF | BORDERMASK_LEFT_OFF_MED ) ) /* bigger line by 26 bytes on the left */
1.1.1.11 root 2043: {
2044: pVideoRaster += BORDERBYTES_LEFT-SCREENBYTES_LEFT+VideoOffset;
2045: memcpy(pSTScreen, pVideoRaster, SCREENBYTES_LEFT);
2046: pVideoRaster += SCREENBYTES_LEFT;
2047: }
1.1.1.16 root 2048: else if ( LineBorderMask & BORDERMASK_LEFT_OFF_2_STE ) /* bigger line by 20 bytes on the left (STE specific) */
2049: { /* bytes 0-3 are not shown, only next 16 bytes (32 pixels, 4 bitplanes) */
2050: if ( SCREENBYTES_LEFT > BORDERBYTES_LEFT_2_STE )
2051: {
2052: memset ( pSTScreen, 0, SCREENBYTES_LEFT-BORDERBYTES_LEFT_2_STE+4 ); /* clear unused pixels + bytes 0-3 */
2053: memcpy ( pSTScreen+SCREENBYTES_LEFT-BORDERBYTES_LEFT_2_STE+4, pVideoRaster+VideoOffset+4, BORDERBYTES_LEFT_2_STE-4 );
2054: }
2055: else
2056: memcpy ( pSTScreen, pVideoRaster+BORDERBYTES_LEFT_2_STE-SCREENBYTES_LEFT+VideoOffset, SCREENBYTES_LEFT );
2057:
2058: pVideoRaster += BORDERBYTES_LEFT_2_STE+VideoOffset;
2059: }
2060: else if (LineBorderMask & BORDERMASK_LEFT_PLUS_2) /* bigger line by 2 bytes on the left */
1.1.1.11 root 2061: {
1.1.1.16 root 2062: if ( SCREENBYTES_LEFT > 2 )
2063: {
2064: memset(pSTScreen,0,SCREENBYTES_LEFT-2); /* clear unused pixels */
2065: memcpy(pSTScreen+SCREENBYTES_LEFT-2, pVideoRaster, 2);
2066: }
2067: else
2068: { /* nothing to copy, left border is not large enough */
2069: }
2070:
1.1.1.11 root 2071: pVideoRaster += 2;
2072: }
1.1.1.16 root 2073: else if (bSteBorderFlag) /* bigger line by 8 bytes on the left (STE specific) */
1.1.1.12 root 2074: {
1.1.1.16 root 2075: if ( SCREENBYTES_LEFT > 4*2 )
2076: {
2077: memset(pSTScreen,0,SCREENBYTES_LEFT-4*2); /* clear unused pixels */
2078: memcpy(pSTScreen+SCREENBYTES_LEFT-4*2, pVideoRaster, 4*2);
2079: }
2080: else
2081: { /* nothing to copy, left border is not large enough */
2082: }
2083:
1.1.1.12 root 2084: pVideoRaster += 4*2;
2085: }
1.1.1.11 root 2086: else
1.1.1.16 root 2087: memset(pSTScreen,0,SCREENBYTES_LEFT); /* left border not removed, clear to color '0' */
1.1.1.11 root 2088:
2089: /* Short line due to hires in the middle ? */
2090: if (LineBorderMask & BORDERMASK_STOP_MIDDLE)
2091: {
2092: /* 106 bytes less in the line */
2093: memcpy(pSTScreen+SCREENBYTES_LEFT, pVideoRaster, SCREENBYTES_MIDDLE-106);
1.1.1.12 root 2094: memset(pSTScreen+SCREENBYTES_LEFT+SCREENBYTES_MIDDLE-106, 0, 106); /* clear unused pixels */
1.1.1.11 root 2095: pVideoRaster += (SCREENBYTES_MIDDLE-106);
2096: }
2097: else
2098: {
2099: /* normal middle part (160 bytes) */
2100: memcpy(pSTScreen+SCREENBYTES_LEFT, pVideoRaster, SCREENBYTES_MIDDLE);
2101: pVideoRaster += SCREENBYTES_MIDDLE;
2102: }
2103:
2104: /* Does have right border ? */
2105: if (LineBorderMask & BORDERMASK_RIGHT_OFF)
2106: {
2107: memcpy(pSTScreen+SCREENBYTES_LEFT+SCREENBYTES_MIDDLE, pVideoRaster, SCREENBYTES_RIGHT);
1.1.1.17 root 2108: pVideoRasterEndLine = pVideoRaster + SCREENBYTES_RIGHT;
1.1.1.16 root 2109: pVideoRaster += BORDERBYTES_RIGHT;
1.1.1.11 root 2110: }
2111: else if (LineBorderMask & BORDERMASK_RIGHT_MINUS_2)
2112: {
2113: /* Shortened line by 2 bytes */
2114: memset(pSTScreen+SCREENBYTES_LEFT+SCREENBYTES_MIDDLE-2, 0, SCREENBYTES_RIGHT+2);
2115: pVideoRaster -= 2;
1.1.1.17 root 2116: pVideoRasterEndLine = pVideoRaster;
1.1.1.11 root 2117: }
2118: else
2119: {
2120: /* Simply clear right border to '0' */
2121: memset(pSTScreen+SCREENBYTES_LEFT+SCREENBYTES_MIDDLE,0,SCREENBYTES_RIGHT);
1.1.1.17 root 2122: pVideoRasterEndLine = pVideoRaster;
1.1.1.11 root 2123: }
2124:
1.1.1.18 root 2125: /* Shifter read bytes and borders can change, but display is blank, so finally clear the line with color 0 */
2126: if (LineBorderMask & BORDERMASK_BLANK_LINE)
2127: memset(pSTScreen, 0, SCREENBYTES_LINE);
2128:
1.1.1.11 root 2129: /* Full right border removal up to the end of the line (cycle 512) */
2130: if (LineBorderMask & BORDERMASK_RIGHT_OFF_FULL)
2131: pVideoRaster += BORDERBYTES_RIGHT_FULL;
2132:
2133: /* Correct the offset for pVideoRaster from BORDERMASK_LEFT_OFF above if needed */
2134: pVideoRaster -= VideoOffset; /* VideoOffset is 0 or -2 */
2135:
2136:
2137: /* STE specific */
1.1.1.13 root 2138: if (!bSteBorderFlag && HWScrollCount) /* Handle STE fine scrolling (HWScrollCount is zero on ST) */
1.1.1.11 root 2139: {
1.1.1.13 root 2140: Uint16 *pScrollAdj; /* Pointer to actual position in line */
1.1.1.11 root 2141: int nNegScrollCnt;
1.1.1.13 root 2142: Uint16 *pScrollEndAddr; /* Pointer to end of the line */
1.1.1.11 root 2143:
2144: nNegScrollCnt = 16 - HWScrollCount;
2145: if (LineBorderMask & BORDERMASK_LEFT_OFF)
2146: pScrollAdj = (Uint16 *)pSTScreen;
1.1.1.16 root 2147: else if (LineBorderMask & BORDERMASK_LEFT_OFF_2_STE)
2148: {
2149: if ( SCREENBYTES_LEFT > BORDERBYTES_LEFT_2_STE )
1.1.1.17 root 2150: pScrollAdj = (Uint16 *)(pSTScreen+8); /* don't scroll the 8 first bytes (keep color 0)*/
1.1.1.16 root 2151: else
2152: pScrollAdj = (Uint16 *)pSTScreen; /* we render less bytes on screen than a real ST, scroll the whole line */
2153: }
1.1.1.11 root 2154: else
2155: pScrollAdj = (Uint16 *)(pSTScreen + SCREENBYTES_LEFT);
1.1.1.16 root 2156:
1.1.1.17 root 2157: /* When shifting the line to the left, we will have 'HWScrollCount' missing pixels at */
2158: /* the end of the line. We must complete these last 16 pixels with pixels from the */
2159: /* video counter last accessed value in pVideoRasterEndLine. */
2160: /* There're 2 passes : */
2161: /* - shift whole line except the last 16 pixels */
2162: /* - shift/complete the last 16 pixels */
2163:
2164: /* Addr of the last byte to shift in the 1st pass (excluding the last 16 pixels of the line) */
1.1.1.11 root 2165: if (LineBorderMask & BORDERMASK_RIGHT_OFF)
2166: pScrollEndAddr = (Uint16 *)(pSTScreen + SCREENBYTES_LINE - 8);
2167: else
2168: pScrollEndAddr = (Uint16 *)(pSTScreen + SCREENBYTES_LEFT + SCREENBYTES_MIDDLE - 8);
2169:
1.1.1.17 root 2170:
2171: if ( LineRes == 1 ) /* med res */
1.1.1.11 root 2172: {
1.1.1.15 root 2173: /* 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 2174: pScrollEndAddr += 2; /* 2 Uint16 = 4 bytes = 16 pixels */
1.1.1.14 root 2175:
1.1.1.17 root 2176: /* Shift the whole line to the left by the given scroll count (except the last 16 pixels) */
1.1.1.14 root 2177: while (pScrollAdj < pScrollEndAddr)
2178: {
2179: do_put_mem_word(pScrollAdj, (do_get_mem_word(pScrollAdj) << HWScrollCount)
2180: | (do_get_mem_word(pScrollAdj+2) >> nNegScrollCnt));
2181: ++pScrollAdj;
2182: }
1.1.1.17 root 2183: /* Handle the last 16 pixels of the line (complete the line with pixels from pVideoRasterEndLine) */
2184: for ( i=0 ; i<2 ; i++ )
2185: do_put_mem_word(pScrollAdj+i, (do_get_mem_word(pScrollAdj+i) << HWScrollCount)
2186: | (do_get_mem_word(pVideoRasterEndLine+i*2) >> nNegScrollCnt));
1.1.1.14 root 2187:
2188: /* Depending on whether $ff8264 or $ff8265 was used to scroll, */
2189: /* we prefetched 16 pixel (4 bytes) */
1.1.1.13 root 2190: if ( HWScrollPrefetch == 1 ) /* $ff8265 prefetches 16 pixels */
2191: pVideoRaster += 2 * 2; /* 2 bitplans */
1.1.1.14 root 2192:
2193: /* If scrolling with $ff8264, there's no prefetch, which means display starts */
2194: /* 16 pixels later but still stops at the normal point (eg we display */
2195: /* (320-16) pixels in low res). We shift the whole line 4 bytes to the right to */
2196: /* get the correct result (using memmove, as src/dest are overlapping). */
2197: else
2198: {
2199: if (LineBorderMask & BORDERMASK_RIGHT_OFF)
2200: memmove ( pSTScreen+4 , pSTScreen , SCREENBYTES_LINE - 4 );
2201: else
2202: memmove ( pSTScreen+4 , pSTScreen , SCREENBYTES_LEFT + SCREENBYTES_MIDDLE - 4 );
2203:
2204: memset ( pSTScreen , 0 , 4 ); /* first 16 pixels are color '0' */
2205: }
1.1.1.11 root 2206: }
1.1.1.14 root 2207:
1.1.1.17 root 2208: else /* low res */
1.1.1.11 root 2209: {
1.1.1.17 root 2210: /* Shift the whole line to the left by the given scroll count (except the last 16 pixels) */
1.1.1.11 root 2211: while (pScrollAdj < pScrollEndAddr)
2212: {
2213: do_put_mem_word(pScrollAdj, (do_get_mem_word(pScrollAdj) << HWScrollCount)
2214: | (do_get_mem_word(pScrollAdj+4) >> nNegScrollCnt));
2215: ++pScrollAdj;
2216: }
1.1.1.17 root 2217: /* Handle the last 16 pixels of the line (complete the line with pixels from pVideoRasterEndLine) */
2218: for ( i=0 ; i<4 ; i++ )
2219: do_put_mem_word(pScrollAdj+i, (do_get_mem_word(pScrollAdj+i) << HWScrollCount)
2220: | (do_get_mem_word(pVideoRasterEndLine+i*2) >> nNegScrollCnt));
1.1.1.13 root 2221:
2222: /* Depending on whether $ff8264 or $ff8265 was used to scroll, */
2223: /* we prefetched 16 pixel (8 bytes) */
2224: if ( HWScrollPrefetch == 1 ) /* $ff8265 prefetches 16 pixels */
2225: pVideoRaster += 4 * 2; /* 4 bitplans */
2226:
2227: /* If scrolling with $ff8264, there's no prefetch, which means display starts */
2228: /* 16 pixels later but still stops at the normal point (eg we display */
2229: /* (320-16) pixels in low res). We shift the whole line 8 bytes to the right to */
2230: /* get the correct result (using memmove, as src/dest are overlapping). */
2231: else
2232: {
2233: if (LineBorderMask & BORDERMASK_RIGHT_OFF)
2234: memmove ( pSTScreen+8 , pSTScreen , SCREENBYTES_LINE - 8 );
2235: else
2236: memmove ( pSTScreen+8 , pSTScreen , SCREENBYTES_LEFT + SCREENBYTES_MIDDLE - 8 );
2237:
2238: memset ( pSTScreen , 0 , 8 ); /* first 16 pixels are color '0' */
2239: }
1.1.1.11 root 2240:
2241: /* On STE, when we have a 230 bytes overscan line and HWScrollCount > 0 */
1.1.1.17 root 2242: /* we must read 6 bytes less than expected if scrolling is using prefetching ($ff8265) */
2243: /* (this is not the case for the 224 bytes overscan which is a multiple of 8) */
1.1.1.11 root 2244: if ( (LineBorderMask & BORDERMASK_LEFT_OFF) && (LineBorderMask & BORDERMASK_RIGHT_OFF) )
1.1.1.17 root 2245: {
2246: if ( HWScrollPrefetch == 1 )
2247: pVideoRaster -= 6; /* we don't add 8 bytes (see above), but 2 */
2248: else
2249: pVideoRaster -= 0;
2250: }
1.1.1.11 root 2251:
2252: }
2253: }
2254:
2255: /* LineWidth is zero on ST. */
2256: /* On STE, the Shifter skips the given amount of words. */
2257: pVideoRaster += LineWidth*2;
2258:
2259: /* On STE, handle modifications of the video counter address $ff8205/07/09 */
2260: /* that occurred while the display was already ON */
1.1.1.16 root 2261: if ( VideoCounterDelayedOffset != 0 )
1.1.1.11 root 2262: {
1.1.1.16 root 2263: pVideoRaster += ( VideoCounterDelayedOffset & ~1 );
2264: // fprintf ( stderr , "adjust video counter offset=%d new video=%x\n" , VideoCounterDelayedOffset , pVideoRaster-STRam );
2265: VideoCounterDelayedOffset = 0;
1.1.1.11 root 2266: }
1.1.1.16 root 2267:
2268: if ( pVideoRasterDelayed != NULL )
1.1.1.11 root 2269: {
1.1.1.16 root 2270: pVideoRaster = pVideoRasterDelayed;
2271: // fprintf ( stderr , "adjust video counter const new video=%x\n" , pVideoRaster-STRam );
2272: pVideoRasterDelayed = NULL;
1.1.1.11 root 2273: }
2274:
2275: /* On STE, if we wrote to the hwscroll register, we set the */
2276: /* new value here, once the current line was processed */
2277: if ( NewHWScrollCount >= 0 )
2278: {
2279: HWScrollCount = NewHWScrollCount;
1.1.1.13 root 2280: HWScrollPrefetch = NewHWScrollPrefetch;
1.1.1.11 root 2281: NewHWScrollCount = -1;
1.1.1.13 root 2282: NewHWScrollPrefetch = -1;
2283: }
2284:
2285: /* On STE, if we trigger the left border + 16 pixels trick, we set the */
2286: /* new value here, once the current line was processed */
2287: if ( NewSteBorderFlag >= 0 )
2288: {
2289: if ( NewSteBorderFlag == 0 )
1.1.1.15 root 2290: bSteBorderFlag = false;
1.1.1.13 root 2291: else
1.1.1.15 root 2292: bSteBorderFlag = true;
1.1.1.13 root 2293: NewSteBorderFlag = -1;
1.1.1.11 root 2294: }
2295:
2296: /* On STE, if we wrote to the linewidth register, we set the */
2297: /* new value here, once the current line was processed */
2298: if ( NewLineWidth >= 0 )
2299: {
2300: LineWidth = NewLineWidth;
2301: NewLineWidth = -1;
2302: }
1.1.1.16 root 2303:
2304:
2305: /* Handle 4 pixels hardware scrolling ('ST Cnx' demo in 'Punish Your Machine') */
2306: /* as well as scrolling occuring when removing the left border. */
2307: /* If >0, shift the line by STF_PixelScroll pixels to the right */
2308: /* If <0, shift the line by -STF_PixelScroll pixels to the left */
2309: /* This should be handled after the STE's hardware scrolling as it will scroll */
2310: /* the whole displayed area (while the STE scrolls pixels inside the displayed area) */
2311: if ( STF_PixelScroll > 0 )
2312: {
2313: Uint16 *pScreenLineEnd;
2314: int count;
2315:
2316: pScreenLineEnd = (Uint16 *) ( pSTScreen + SCREENBYTES_LINE - 2 );
1.1.1.17 root 2317: if ( LineRes == 0 ) /* low res */
2318: {
2319: for ( count = 0 ; count < ( SCREENBYTES_LINE - 8 ) / 2 ; count++ , pScreenLineEnd-- )
2320: do_put_mem_word ( pScreenLineEnd , ( ( do_get_mem_word ( pScreenLineEnd - 4 ) << 16 ) | ( do_get_mem_word ( pScreenLineEnd ) ) ) >> STF_PixelScroll );
2321: /* Handle the first 16 pixels of the line (add color 0 pixels to the extreme left) */
2322: do_put_mem_word ( pScreenLineEnd-0 , ( do_get_mem_word ( pScreenLineEnd-0 ) >> STF_PixelScroll ) );
2323: do_put_mem_word ( pScreenLineEnd-1 , ( do_get_mem_word ( pScreenLineEnd-1 ) >> STF_PixelScroll ) );
2324: do_put_mem_word ( pScreenLineEnd-2 , ( do_get_mem_word ( pScreenLineEnd-2 ) >> STF_PixelScroll ) );
2325: do_put_mem_word ( pScreenLineEnd-3 , ( do_get_mem_word ( pScreenLineEnd-3 ) >> STF_PixelScroll ) );
2326: }
2327: else /* med res */
2328: {
2329: for ( count = 0 ; count < ( SCREENBYTES_LINE - 4 ) / 2 ; count++ , pScreenLineEnd-- )
2330: do_put_mem_word ( pScreenLineEnd , ( ( do_get_mem_word ( pScreenLineEnd - 2 ) << 16 ) | ( do_get_mem_word ( pScreenLineEnd ) ) ) >> STF_PixelScroll );
2331: /* Handle the first 16 pixels of the line (add color 0 pixels to the extreme left) */
2332: do_put_mem_word ( pScreenLineEnd-0 , ( do_get_mem_word ( pScreenLineEnd-0 ) >> STF_PixelScroll ) );
2333: do_put_mem_word ( pScreenLineEnd-1 , ( do_get_mem_word ( pScreenLineEnd-1 ) >> STF_PixelScroll ) );
2334: }
1.1.1.16 root 2335: }
2336: else if ( STF_PixelScroll < 0 )
2337: {
2338: Uint16 *pScreenLineStart;
2339: int count;
2340:
2341: STF_PixelScroll = -STF_PixelScroll;
2342: pScreenLineStart = (Uint16 *)pSTScreen;
1.1.1.17 root 2343: if ( LineRes == 0 ) /* low res */
2344: {
2345: for ( count = 0 ; count < ( SCREENBYTES_LINE - 8 ) / 2 ; count++ , pScreenLineStart++ )
2346: do_put_mem_word ( pScreenLineStart , ( ( do_get_mem_word ( pScreenLineStart ) << STF_PixelScroll ) | ( do_get_mem_word ( pScreenLineStart + 4 ) >> (16-STF_PixelScroll) ) ) );
2347: /* Handle the last 16 pixels of the line (add color 0 pixels to the extreme right) */
2348: do_put_mem_word ( pScreenLineStart+0 , ( do_get_mem_word ( pScreenLineStart+0 ) << STF_PixelScroll ) );
2349: do_put_mem_word ( pScreenLineStart+1 , ( do_get_mem_word ( pScreenLineStart+1 ) << STF_PixelScroll ) );
2350: do_put_mem_word ( pScreenLineStart+2 , ( do_get_mem_word ( pScreenLineStart+2 ) << STF_PixelScroll ) );
2351: do_put_mem_word ( pScreenLineStart+3 , ( do_get_mem_word ( pScreenLineStart+3 ) << STF_PixelScroll ) );
2352: }
2353: else /* med res */
2354: {
2355: for ( count = 0 ; count < ( SCREENBYTES_LINE - 4 ) / 2 ; count++ , pScreenLineStart++ )
2356: do_put_mem_word ( pScreenLineStart , ( ( do_get_mem_word ( pScreenLineStart ) << STF_PixelScroll ) | ( do_get_mem_word ( pScreenLineStart + 2 ) >> (16-STF_PixelScroll) ) ) );
2357: /* Handle the last 16 pixels of the line (add color 0 pixels to the extreme right) */
2358: do_put_mem_word ( pScreenLineStart+0 , ( do_get_mem_word ( pScreenLineStart+0 ) << STF_PixelScroll ) );
2359: do_put_mem_word ( pScreenLineStart+1 , ( do_get_mem_word ( pScreenLineStart+1 ) << STF_PixelScroll ) );
2360: }
1.1.1.16 root 2361: }
1.1.1.11 root 2362: }
2363:
2364: /* Each screen line copied to buffer is always same length */
2365: pSTScreen += SCREENBYTES_LINE;
2366: }
2367:
2368:
2369: /*-----------------------------------------------------------------------*/
2370: /**
2371: * Copy extended GEM resolution screen
2372: */
1.1.1.9 root 2373: static void Video_CopyVDIScreen(void)
1.1 root 2374: {
1.1.1.11 root 2375: /* Copy whole screen, don't care about being exact as for GEM only */
2376: memcpy(pSTScreen, pVideoRaster, ((VDIWidth*VDIPlanes)/8)*VDIHeight);
1.1 root 2377: }
2378:
1.1.1.2 root 2379:
2380: /*-----------------------------------------------------------------------*/
1.1.1.11 root 2381: /**
2382: * Clear raster line table to store changes in palette/resolution on a line
2383: * basic. Called once on VBL interrupt.
2384: */
1.1 root 2385: void Video_SetScreenRasters(void)
2386: {
1.1.1.11 root 2387: pHBLPaletteMasks = HBLPaletteMasks;
2388: pHBLPalettes = HBLPalettes;
2389: memset(pHBLPaletteMasks, 0, sizeof(Uint32)*NUM_VISIBLE_LINES); /* Clear array */
1.1 root 2390: }
2391:
1.1.1.2 root 2392:
2393: /*-----------------------------------------------------------------------*/
1.1.1.11 root 2394: /**
2395: * Set pointers to HBLPalette tables to store correct colours/resolutions
2396: */
1.1.1.9 root 2397: static void Video_SetHBLPaletteMaskPointers(void)
1.1 root 2398: {
1.1.1.15 root 2399: int FrameCycles, HblCounterVideo, LineCycles;
1.1.1.11 root 2400: int Line;
2401:
2402: /* FIXME [NP] We should use Cycles_GetCounterOnWriteAccess, but it wouldn't */
2403: /* work when using multiple accesses instructions like move.l or movem */
1.1.1.15 root 2404: /* To correct this, we assume a delay of 8 cycles (should give a good approximation */
1.1.1.11 root 2405: /* of a move.w or movem.l for example) */
2406: // FrameCycles = Cycles_GetCounterOnWriteAccess(CYCLES_COUNTER_VIDEO);
2407: FrameCycles = Cycles_GetCounter(CYCLES_COUNTER_VIDEO) + 8;
2408:
2409: /* Find 'line' into palette - screen starts 63 lines down, less 29 for top overscan */
1.1.1.15 root 2410: Video_ConvertPosition ( FrameCycles , &HblCounterVideo , &LineCycles );
2411: Line = HblCounterVideo - nFirstVisibleHbl;
1.1.1.11 root 2412:
2413: /* FIXME [NP] if the color change occurs after the last visible pixel of a line */
2414: /* we consider the palette should be modified on the next line. This is quite */
2415: /* a hack, we should handle all color changes through spec512.c to have cycle */
2416: /* accuracy all the time. */
1.1.1.15 root 2417: if ( LineCycles >= LINE_END_CYCLE_NO_RIGHT )
2418: Line++;
1.1.1.11 root 2419:
2420: if (Line < 0) /* Limit to top/bottom of possible visible screen */
2421: Line = 0;
2422: if (Line >= NUM_VISIBLE_LINES)
2423: Line = NUM_VISIBLE_LINES-1;
2424:
2425: /* Store pointers */
2426: pHBLPaletteMasks = &HBLPaletteMasks[Line]; /* Next mask entry */
2427: pHBLPalettes = &HBLPalettes[16*Line]; /* Next colour raster list x16 colours */
1.1 root 2428: }
1.1.1.8 root 2429:
2430:
1.1.1.9 root 2431: /*-----------------------------------------------------------------------*/
1.1.1.11 root 2432: /**
2433: * Set video shifter timing variables according to screen refresh rate.
2434: * Note: The following equation must be satisfied for correct timings:
2435: *
2436: * nCyclesPerLine * nScanlinesPerFrame * nScreenRefreshRate = 8 MHz
2437: */
1.1.1.10 root 2438: static void Video_ResetShifterTimings(void)
2439: {
1.1.1.11 root 2440: Uint8 nSyncByte;
1.1.1.10 root 2441:
1.1.1.11 root 2442: nSyncByte = IoMem_ReadByte(0xff820a);
1.1.1.10 root 2443:
1.1.1.19! root 2444: if ((IoMem_ReadByte(0xff8260) & 3) == 2)
1.1.1.11 root 2445: {
2446: /* 71 Hz, monochrome */
2447: nScreenRefreshRate = 71;
2448: nScanlinesPerFrame = SCANLINES_PER_FRAME_71HZ;
2449: nCyclesPerLine = CYCLES_PER_LINE_71HZ;
1.1.1.13 root 2450: nStartHBL = VIDEO_START_HBL_71HZ;
1.1.1.11 root 2451: nFirstVisibleHbl = FIRST_VISIBLE_HBL_71HZ;
1.1.1.13 root 2452: nLastVisibleHbl = FIRST_VISIBLE_HBL_71HZ + VIDEO_HEIGHT_HBL_MONO;
1.1.1.11 root 2453: }
2454: else if (nSyncByte & 2) /* Check if running in 50 Hz or in 60 Hz */
2455: {
2456: /* 50 Hz */
2457: nScreenRefreshRate = 50;
2458: nScanlinesPerFrame = SCANLINES_PER_FRAME_50HZ;
2459: nCyclesPerLine = CYCLES_PER_LINE_50HZ;
1.1.1.13 root 2460: nStartHBL = VIDEO_START_HBL_50HZ;
1.1.1.11 root 2461: nFirstVisibleHbl = FIRST_VISIBLE_HBL_50HZ;
1.1.1.13 root 2462: nLastVisibleHbl = FIRST_VISIBLE_HBL_50HZ + NUM_VISIBLE_LINES;
1.1.1.11 root 2463: }
2464: else
2465: {
2466: /* 60 Hz */
2467: nScreenRefreshRate = 60;
2468: nScanlinesPerFrame = SCANLINES_PER_FRAME_60HZ;
2469: nCyclesPerLine = CYCLES_PER_LINE_60HZ;
1.1.1.13 root 2470: nStartHBL = VIDEO_START_HBL_60HZ;
1.1.1.11 root 2471: nFirstVisibleHbl = FIRST_VISIBLE_HBL_60HZ;
1.1.1.13 root 2472: nLastVisibleHbl = FIRST_VISIBLE_HBL_60HZ + NUM_VISIBLE_LINES;
1.1.1.11 root 2473: }
2474:
2475: if (bUseHighRes)
2476: {
1.1.1.13 root 2477: nEndHBL = nStartHBL + VIDEO_HEIGHT_HBL_MONO;
1.1.1.11 root 2478: }
2479: else
2480: {
1.1.1.13 root 2481: nEndHBL = nStartHBL + VIDEO_HEIGHT_HBL_COLOR;
1.1.1.11 root 2482: }
2483:
2484: /* Reset freq changes position for the next VBL to come */
1.1.1.13 root 2485: LastCycleScroll8264 = -1;
2486: LastCycleScroll8265 = -1;
1.1.1.15 root 2487:
2488: TimerBEventCountCycleStart = -1; /* reset timer B activation cycle for this VBL */
2489:
2490: LastCycleHblException = -1;
1.1.1.18 root 2491:
2492: BlankLines = 0;
1.1.1.11 root 2493: }
1.1.1.10 root 2494:
2495:
1.1.1.11 root 2496: /*-----------------------------------------------------------------------*/
2497: /**
1.1.1.15 root 2498: * Clear the array indicating the state of each video line.
1.1.1.11 root 2499: */
1.1.1.15 root 2500: static void Video_InitShifterLines ( void )
1.1.1.11 root 2501: {
1.1.1.15 root 2502: int i;
2503:
2504: for ( i=0 ; i<MAX_SCANLINES_PER_FRAME ; i++ )
2505: {
2506: ShifterFrame.ShifterLines[i].BorderMask = 0;
2507: ShifterFrame.ShifterLines[i].DisplayPixelShift = 0;
2508: ShifterFrame.ShifterLines[i].DisplayStartCycle = -1;
2509: }
2510:
2511: ShifterFrame.ShifterLines[0].StartCycle = 0; /* 1st HBL starts at cycle 0 */
1.1.1.10 root 2512: }
2513:
2514:
2515: /*-----------------------------------------------------------------------*/
1.1.1.11 root 2516: /**
2517: * Called on VBL, set registers ready for frame
2518: */
1.1.1.9 root 2519: static void Video_ClearOnVBL(void)
2520: {
1.1.1.11 root 2521: /* New screen, so first HBL */
2522: nHBL = 0;
2523: OverscanMode = OVERSCANMODE_NONE;
2524:
2525: Video_ResetShifterTimings();
2526:
2527: /* Get screen address pointer, aligned to 256 bytes on ST (ie ignore lowest byte) */
2528: VideoBase = (Uint32)IoMem_ReadByte(0xff8201)<<16 | (Uint32)IoMem_ReadByte(0xff8203)<<8;
2529: if (ConfigureParams.System.nMachineType != MACHINE_ST)
2530: {
2531: /* on STe 2 aligned, on Falcon 4 aligned, on TT 8 aligned. We do STe. */
2532: VideoBase |= IoMem_ReadByte(0xff820d) & ~1;
2533: }
2534: pVideoRaster = &STRam[VideoBase];
2535: pSTScreen = pFrameBuffer->pSTScreen;
2536:
2537: Video_SetScreenRasters();
1.1.1.15 root 2538: Video_InitShifterLines();
1.1.1.11 root 2539: Spec512_StartVBL();
1.1.1.15 root 2540: Video_StartHBL(); /* Init ShifterFrame.ShifterLines[0] */
1.1.1.11 root 2541: }
2542:
2543:
2544: /*-----------------------------------------------------------------------*/
2545: /**
2546: * Get width, height and bpp according to TT-Resolution
2547: */
2548: void Video_GetTTRes(int *width, int *height, int *bpp)
2549: {
2550: switch (TTRes)
2551: {
2552: case ST_LOW_RES: *width = 320; *height = 200; *bpp = 4; break;
2553: case ST_MEDIUM_RES:*width = 640; *height = 200; *bpp = 2; break;
2554: case ST_HIGH_RES: *width = 640; *height = 400; *bpp = 1; break;
2555: case TT_LOW_RES: *width = 320; *height = 480; *bpp = 8; break;
2556: case TT_MEDIUM_RES:*width = 640; *height = 480; *bpp = 4; break;
2557: case TT_HIGH_RES: *width = 1280; *height = 960; *bpp = 1; break;
2558: default:
2559: fprintf(stderr, "TT res error!\n");
2560: *width = 320; *height = 200; *bpp = 4;
2561: break;
2562: }
2563: }
2564:
2565:
2566: /*-----------------------------------------------------------------------*/
2567: /**
2568: * Convert TT palette to SDL palette
2569: */
2570: static void Video_UpdateTTPalette(int bpp)
2571: {
2572: Uint32 ttpalette, src, dst;
2573: Uint8 r,g,b, lowbyte, highbyte;
2574: Uint16 stcolor, ttcolor;
2575: int i, offset, colors;
2576:
2577: ttpalette = 0xff8400;
2578:
2579: if (!bTTColorsSTSync)
2580: {
2581: /* sync TT ST-palette to TT-palette */
2582: src = 0xff8240; /* ST-palette */
2583: offset = (IoMem_ReadWord(0xff8262) & 0x0f);
1.1.1.13 root 2584: /*fprintf(stderr, "offset: %d\n", offset);*/
1.1.1.11 root 2585: dst = ttpalette + offset * 16*SIZE_WORD;
2586:
2587: for (i = 0; i < 16; i++)
2588: {
2589: stcolor = IoMem_ReadWord(src);
2590: ttcolor = ((stcolor&0x700) << 1) | ((stcolor&0x70) << 1) | ((stcolor&0x7) << 1);
2591: IoMem_WriteWord(dst, ttcolor);
2592: src += SIZE_WORD;
2593: dst += SIZE_WORD;
2594: }
1.1.1.15 root 2595: bTTColorsSTSync = true;
1.1.1.11 root 2596: }
2597:
2598: colors = 1 << bpp;
2599: if (bpp == 1)
2600: {
2601: /* Monochrome mode... palette is hardwired (?) */
2602: HostScreen_setPaletteColor(0, 255, 255, 255);
2603: HostScreen_setPaletteColor(1, 0, 0, 0);
2604: }
2605: else
2606: {
2607: for (i = 0; i < colors; i++)
2608: {
2609: lowbyte = IoMem_ReadByte(ttpalette++);
2610: highbyte = IoMem_ReadByte(ttpalette++);
2611: r = (lowbyte & 0x0f) << 4;
2612: g = (highbyte & 0xf0);
2613: b = (highbyte & 0x0f) << 4;
2614: //printf("%d: (%d,%d,%d)\n", i,r,g,b);
2615: HostScreen_setPaletteColor(i, r,g,b);
2616: }
2617: }
2618:
2619: HostScreen_updatePalette(colors);
1.1.1.15 root 2620: bTTColorsSync = true;
1.1.1.11 root 2621: }
2622:
2623:
2624: /*-----------------------------------------------------------------------*/
2625: /**
1.1.1.13 root 2626: * Update TT palette and blit TT screen using VIDEL code.
2627: * @return true if the screen contents changed
1.1.1.11 root 2628: */
1.1.1.16 root 2629: bool Video_RenderTTScreen(void)
1.1.1.11 root 2630: {
2631: static int nPrevTTRes = -1;
2632: int width, height, bpp;
2633:
2634: Video_GetTTRes(&width, &height, &bpp);
2635: if (TTRes != nPrevTTRes)
2636: {
2637: HostScreen_setWindowSize(width, height, 8);
2638: nPrevTTRes = TTRes;
2639: if (bpp == 1) /* Assert that mono palette will be used in mono mode */
1.1.1.15 root 2640: bTTColorsSync = false;
1.1.1.11 root 2641: }
2642:
2643: /* colors need synching? */
2644: if (!(bTTColorsSync && bTTColorsSTSync))
2645: {
2646: Video_UpdateTTPalette(bpp);
2647: }
2648:
2649: /* Yes, we are abusing the Videl routines for rendering the TT modes! */
2650: if (!HostScreen_renderBegin())
1.1.1.13 root 2651: return false;
1.1.1.16 root 2652: if (nScreenZoomX * nScreenZoomY != 1)
1.1.1.11 root 2653: VIDEL_ConvertScreenZoom(width, height, bpp, width * bpp / 16);
2654: else
2655: VIDEL_ConvertScreenNoZoom(width, height, bpp, width * bpp / 16);
2656: HostScreen_renderEnd();
1.1.1.15 root 2657: HostScreen_update1(false);
1.1.1.13 root 2658:
2659: return true;
1.1.1.11 root 2660: }
2661:
2662:
2663: /*-----------------------------------------------------------------------*/
2664: /**
2665: * Draw screen (either with ST/STE shifter drawing functions or with
2666: * Videl drawing functions)
2667: */
2668: static void Video_DrawScreen(void)
2669: {
2670: /* Skip frame if need to */
1.1.1.13 root 2671: if (nVBLs % (nFrameSkips+1))
1.1.1.11 root 2672: return;
2673:
2674: /* Use extended VDI resolution?
2675: * If so, just copy whole screen on VBL rather than per HBL */
2676: if (bUseVDIRes)
2677: Video_CopyVDIScreen();
2678:
2679: /* Now draw the screen! */
2680: if (ConfigureParams.System.nMachineType == MACHINE_FALCON && !bUseVDIRes)
2681: {
1.1.1.17 root 2682: VIDEL_renderScreen();
1.1.1.11 root 2683: }
2684: else if (ConfigureParams.System.nMachineType == MACHINE_TT && !bUseVDIRes)
2685: {
1.1.1.17 root 2686: Video_RenderTTScreen();
1.1.1.11 root 2687: }
2688: else
1.1.1.13 root 2689: {
2690: /* Before drawing the screen, ensure all unused lines are cleared to color 0 */
2691: /* (this can happen in 60 Hz when hatari is displaying the screen's border) */
2692: /* pSTScreen was set during Video_CopyScreenLineColor */
1.1.1.14 root 2693: if (!bUseVDIRes && nHBL < nLastVisibleHbl)
1.1.1.13 root 2694: memset(pSTScreen, 0, SCREENBYTES_LINE * ( nLastVisibleHbl - nHBL ) );
2695:
1.1.1.17 root 2696: Screen_Draw();
1.1.1.13 root 2697: }
1.1.1.11 root 2698: }
2699:
2700:
2701: /*-----------------------------------------------------------------------*/
2702: /**
1.1.1.15 root 2703: * Start HBL, Timer B and VBL interrupts.
2704: */
2705:
2706:
2707: /**
2708: * Start HBL or Timer B interrupt at position Pos. If position Pos was
2709: * already reached, then the interrupt is set on the next line.
2710: */
2711:
2712: static void Video_AddInterrupt ( int Pos , interrupt_id Handler )
2713: {
2714: int FrameCycles , HblCounterVideo , LineCycles;
2715:
2716: if ( nHBL >= nScanlinesPerFrame )
2717: return; /* don't set a new hbl/timer B if we're on the last line, as the vbl will happen first */
2718:
2719: Video_GetPosition ( &FrameCycles , &HblCounterVideo , &LineCycles );
1.1.1.16 root 2720: //fprintf ( stderr , "add int pos=%d handler=%d LineCycles=%d nCyclesPerLine=%d \n" , Pos , Handler , LineCycles , nCyclesPerLine );
1.1.1.15 root 2721:
2722: if ( LineCycles < Pos ) /* changed before reaching the new Pos on the current line */
1.1.1.16 root 2723: CycInt_AddRelativeInterrupt ( Pos - LineCycles , INT_CPU_CYCLE, Handler );
1.1.1.15 root 2724: else /* Pos will be applied on next line */
1.1.1.16 root 2725: CycInt_AddRelativeInterrupt ( Pos - LineCycles + nCyclesPerLine , INT_CPU_CYCLE, Handler );
1.1.1.15 root 2726: }
2727:
2728:
2729: static void Video_AddInterruptHBL ( int Pos )
2730: {
1.1.1.16 root 2731: //fprintf ( stderr , "add hbl pos=%d\n" , Pos );
1.1.1.15 root 2732: if ( !bUseVDIRes )
2733: Video_AddInterrupt ( Pos , INTERRUPT_VIDEO_HBL );
2734: }
2735:
2736:
2737: void Video_AddInterruptTimerB ( int Pos )
2738: {
1.1.1.16 root 2739: //fprintf ( stderr , "add timerb pos=%d\n" , Pos );
1.1.1.15 root 2740: if ( !bUseVDIRes )
2741: Video_AddInterrupt ( Pos , INTERRUPT_VIDEO_ENDLINE );
2742: }
2743:
2744:
2745: /**
2746: * Add some video interrupts to handle the first HBL and the first Timer B
2747: * in a new VBL. Also add an interrupt to trigger the next VBL.
2748: * This function is called from the VBL, so we use PendingCycleOver to take into account
2749: * the possible delay occurring when the VBL was executed.
1.1.1.16 root 2750: * In monochrome mode (71 Hz) a line is 224 cycles, which means if VBL is delayed
2751: * by a DIVS, FrameCycles can already be > 224 and we need to add an immediate
2752: * interrupt for hbl/timer in the next 4/8 cycles (else crash might happen as
2753: * line 0 processing would be skipped).
1.1.1.11 root 2754: */
1.1.1.15 root 2755: void Video_StartInterrupts ( int PendingCyclesOver )
1.1.1.11 root 2756: {
1.1.1.16 root 2757: int FrameCycles , HblCounterVideo , LineCycles;
2758: int Pos;
2759:
1.1.1.15 root 2760: /* HBL/Timer B are not emulated in VDI mode */
1.1.1.14 root 2761: if (!bUseVDIRes)
2762: {
1.1.1.16 root 2763: Video_GetPosition ( &FrameCycles , &HblCounterVideo , &LineCycles );
1.1.1.15 root 2764:
1.1.1.16 root 2765: /* Set Timer B interrupt for line 0 */
2766: Pos = Video_TimerB_GetPos ( 0 );
2767: if ( Pos > FrameCycles ) /* check Pos for line 0 was not already reached */
2768: Video_AddInterruptTimerB ( Pos );
2769: else /* the VBL was delayed by more than 1 HBL, add an immediate timer B */
2770: {
2771: LOG_TRACE(TRACE_VIDEO_VBL , "VBL %d delayed too much video_cyc=%d >= pos=%d for first timer B, add immediate timer B\n" ,
2772: nVBLs , FrameCycles , Pos );
2773: CycInt_AddRelativeInterrupt ( 4 , INT_CPU_CYCLE, INTERRUPT_VIDEO_ENDLINE );
2774: }
2775:
2776: /* Set HBL interrupt for line 0 */
2777: Pos = Video_HBL_GetPos();
2778: if ( Pos > FrameCycles ) /* check Pos for line 0 was not already reached */
2779: Video_AddInterruptHBL ( Pos );
2780: else /* the VBL was delayed by more than 1 HBL, add an immediate HBL */
2781: {
2782: LOG_TRACE(TRACE_VIDEO_VBL , "VBL %d delayed too much video_cyc=%d >= pos=%d for first HBL, add immediate HBL\n" ,
2783: nVBLs , FrameCycles , Pos );
2784: CycInt_AddRelativeInterrupt ( 8 , INT_CPU_CYCLE, INTERRUPT_VIDEO_HBL ); /* use 8 instead of 4 to happen after immediate timer b */
2785: }
1.1.1.14 root 2786: }
1.1.1.15 root 2787:
2788: /* TODO replace CYCLES_PER_FRAME */
1.1.1.16 root 2789: CyclesPerVBL = CYCLES_PER_FRAME;
1.1.1.18 root 2790: /* Note: Refresh rate less than 50 Hz does not make sense! */
2791: assert(CyclesPerVBL <= CPU_FREQ/49);
2792: /* Add new VBL interrupt: */
1.1.1.16 root 2793: CycInt_AddRelativeInterrupt(CyclesPerVBL - PendingCyclesOver, INT_CPU_CYCLE, INTERRUPT_VIDEO_VBL);
1.1.1.11 root 2794: }
2795:
2796:
2797: /*-----------------------------------------------------------------------*/
2798: /**
1.1.1.15 root 2799: * VBL interrupt : set new interrupts, draw screen, generate sound,
2800: * reset counters, ...
1.1.1.11 root 2801: */
1.1.1.15 root 2802: void Video_InterruptHandler_VBL ( void )
1.1.1.11 root 2803: {
2804: int PendingCyclesOver;
1.1.1.9 root 2805:
1.1.1.11 root 2806: /* Store cycles we went over for this frame(this is our inital count) */
2807: PendingCyclesOver = -INT_CONVERT_FROM_INTERNAL ( PendingInterruptCount , INT_CPU_CYCLE ); /* +ve */
1.1.1.10 root 2808:
1.1.1.11 root 2809: /* Remove this interrupt from list and re-order */
1.1.1.16 root 2810: CycInt_AcknowledgeInterrupt();
1.1.1.9 root 2811:
1.1.1.14 root 2812: /* Increment the vbl jitter index */
2813: VblJitterIndex++;
2814: if ( VblJitterIndex == VBL_JITTER_MAX_POS )
2815: VblJitterIndex = 0;
2816:
1.1.1.11 root 2817: /* Set frame cycles, used for Video Address */
1.1.1.13 root 2818: Cycles_SetCounter(CYCLES_COUNTER_VIDEO, PendingCyclesOver + VblVideoCycleOffset);
1.1.1.9 root 2819:
1.1.1.11 root 2820: /* Clear any key presses which are due to be de-bounced (held for one ST frame) */
2821: Keymap_DebounceAllKeys();
1.1.1.9 root 2822:
1.1.1.11 root 2823: Video_DrawScreen();
1.1.1.9 root 2824:
1.1.1.11 root 2825: /* Check printer status */
2826: Printer_CheckIdleStatus();
2827:
2828: /* Update counter for number of screen refreshes per second */
2829: nVBLs++;
2830: /* Set video registers for frame */
2831: Video_ClearOnVBL();
1.1.1.15 root 2832:
1.1.1.17 root 2833: /* Videl Vertical counter reset (To be removed when Videl emulation is finished) */
2834: if (ConfigureParams.System.nMachineType == MACHINE_FALCON) {
2835: vfc_counter = 0;
2836: }
2837:
1.1.1.15 root 2838: /* Since we don't execute HBL functions in VDI mode, we've got to
2839: * initialize the first HBL palette here when VDI mode is enabled. */
2840: if (bUseVDIRes)
2841: Video_StoreFirstLinePalette();
2842:
2843: /* Start VBL, HBL and Timer B interrupts (this must be done after resetting
2844: * video cycle counter setting default freq values in Video_ClearOnVBL) */
2845: Video_StartInterrupts(PendingCyclesOver);
2846:
2847: /* Act on shortcut keys */
2848: ShortCut_ActKey();
2849:
1.1.1.16 root 2850: /* Record video frame is necessary */
2851: if ( bRecordingAvi )
2852: Avi_RecordVideoStream ();
2853:
1.1.1.11 root 2854: /* Store off PSG registers for YM file, is enabled */
2855: YMFormat_UpdateRecording();
2856: /* Generate 1/50th second of sound sample data, to be played by sound thread */
2857: Sound_Update_VBL();
2858:
1.1.1.15 root 2859: LOG_TRACE(TRACE_VIDEO_VBL , "VBL %d video_cyc=%d pending_cyc=%d jitter=%d\n" ,
1.1.1.14 root 2860: nVBLs , Cycles_GetCounter(CYCLES_COUNTER_VIDEO) , PendingCyclesOver , VblJitterArray[ VblJitterIndex ] );
1.1.1.11 root 2861:
1.1.1.16 root 2862: M68000_Exception(EXCEPTION_VBLANK, M68000_EXC_SRC_AUTOVEC); /* Vertical blank interrupt, level 4! */
1.1.1.11 root 2863:
2864: Main_WaitOnVbl();
1.1.1.9 root 2865: }
2866:
2867:
2868: /*-----------------------------------------------------------------------*/
1.1.1.11 root 2869: /**
1.1.1.13 root 2870: * Write to video address base high, med and low register (0xff8201/03/0d).
2871: * On STE, when a program writes to high or med registers, base low register
2872: * is reset to zero.
1.1.1.11 root 2873: */
1.1.1.9 root 2874: void Video_ScreenBaseSTE_WriteByte(void)
2875: {
1.1.1.13 root 2876: if ( ( IoAccessCurrentAddress == 0xff8201 ) || ( IoAccessCurrentAddress == 0xff8203 ) )
2877: IoMem[0xff820d] = 0; /* Reset screen base low register */
1.1.1.8 root 2878:
1.1.1.15 root 2879: if (LOG_TRACE_LEVEL(TRACE_VIDEO_STE))
1.1.1.11 root 2880: {
1.1.1.15 root 2881: int FrameCycles, HblCounterVideo, LineCycles;
2882:
2883: Video_GetPosition_OnWriteAccess ( &FrameCycles , &HblCounterVideo , &LineCycles );
2884:
2885: 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 2886: (IoMem[0xff8201]<<16)+(IoMem[0xff8203]<<8)+IoMem[0xff820d] ,
1.1.1.15 root 2887: FrameCycles, LineCycles, nHBL, HblCounterVideo, M68000_GetPC(), CurrentInstrCycles );
1.1.1.11 root 2888: }
1.1.1.8 root 2889: }
2890:
2891: /*-----------------------------------------------------------------------*/
1.1.1.11 root 2892: /**
2893: * Read video address counter and update ff8205/07/09
2894: */
2895: void Video_ScreenCounter_ReadByte(void)
1.1.1.8 root 2896: {
1.1.1.11 root 2897: Uint32 addr;
1.1.1.8 root 2898:
1.1.1.11 root 2899: addr = Video_CalculateAddress(); /* get current video address */
2900: IoMem[0xff8205] = ( addr >> 16 ) & 0xff;
2901: IoMem[0xff8207] = ( addr >> 8 ) & 0xff;
2902: IoMem[0xff8209] = addr & 0xff;
1.1.1.8 root 2903: }
2904:
1.1.1.9 root 2905: /*-----------------------------------------------------------------------*/
1.1.1.11 root 2906: /**
2907: * Write to video address counter (0xff8205, 0xff8207 and 0xff8209).
2908: * Called on STE only and like with base address, you cannot set lowest bit.
1.1.1.16 root 2909: *
2910: * As Hatari processes/converts one complete video line at a time, we have 3 cases :
2911: * - If display has not started yet for this line (left border), we can change pVideoRaster now.
2912: * We must take into account that the MMU starts 16 cycles earlier when hscroll is used.
2913: * - If display has stopped for this line (right border), we will change pVideoRaster
2914: * in Video_CopyScreenLineColor using pVideoRasterDelayed once the line has been processed.
2915: * - If the write is made while display is on, then we must compute an offset of what
2916: * the new address should have been, to correctly emulate the video address at the
2917: * end of the line while taking into account the fact that the video pointer is incrementing
2918: * during the active part of the line (this is the most "tricky" case)
2919: *
2920: * 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 2921: */
1.1.1.9 root 2922: void Video_ScreenCounter_WriteByte(void)
2923: {
1.1.1.11 root 2924: Uint8 AddrByte;
1.1.1.16 root 2925: Uint32 addr_cur;
2926: Uint32 addr_new = 0;
1.1.1.15 root 2927: int FrameCycles, HblCounterVideo, LineCycles;
1.1.1.13 root 2928: int Delayed;
1.1.1.16 root 2929: int MMUStartCycle;
1.1.1.11 root 2930:
1.1.1.15 root 2931: Video_GetPosition_OnWriteAccess ( &FrameCycles , &HblCounterVideo , &LineCycles );
1.1.1.11 root 2932:
2933: AddrByte = IoMem[ IoAccessCurrentAddress ];
2934:
1.1.1.16 root 2935: /* Get current video address from the shifter */
2936: addr_cur = Video_CalculateAddress();
2937: /* Correct the address in case a modification of ff8205/07/09 was already delayed */
2938: addr_new = addr_cur + VideoCounterDelayedOffset;
2939: /* Correct the address in case video counter was already modified in the right border */
2940: if ( pVideoRasterDelayed != NULL )
2941: addr_new = pVideoRasterDelayed - STRam;
2942:
2943: /* addr_new should now be the same as on a real STE */
2944: /* Compute the new video address with one modified byte */
2945: if ( IoAccessCurrentAddress == 0xff8205 )
2946: addr_new = ( addr_new & 0x00ffff ) | ( AddrByte << 16 );
2947: else if ( IoAccessCurrentAddress == 0xff8207 )
2948: addr_new = ( addr_new & 0xff00ff ) | ( AddrByte << 8 );
2949: else if ( IoAccessCurrentAddress == 0xff8209 )
2950: addr_new = ( addr_new & 0xffff00 ) | ( AddrByte );
2951:
2952: MMUStartCycle = Video_GetMMUStartCycle ( ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle );
2953:
1.1.1.11 root 2954: /* If display has not started, we can still modify pVideoRaster */
1.1.1.16 root 2955: /* We must also check the write does not overlap the end of the line (to be sure Video_EndHBL is called first) */
2956: if ( ( ( LineCycles <= MMUStartCycle ) && ( nHBL == HblCounterVideo ) )
1.1.1.18 root 2957: || ( nHBL < nStartHBL ) || ( nHBL >= nEndHBL + BlankLines ) )
1.1.1.11 root 2958: {
1.1.1.16 root 2959: pVideoRaster = &STRam[addr_new & ~1]; /* set new video address */
2960: VideoCounterDelayedOffset = 0;
2961: pVideoRasterDelayed = NULL;
1.1.1.15 root 2962: Delayed = false;
1.1.1.11 root 2963: }
2964:
1.1.1.16 root 2965: /* Display is OFF (right border) but we can't change pVideoRaster now, we must process Video_CopyScreenLineColor first */
1.1.1.18 root 2966: else if ( ( nHBL >= nStartHBL ) && ( nHBL < nEndHBL + BlankLines ) /* line should be active */
1.1.1.16 root 2967: && ( ( LineCycles > ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle ) /* we're in the right border */
2968: || ( HblCounterVideo == nHBL+1 ) ) ) /* or the write overlaps the next line and Video_EndHBL was not called yet */
2969: {
2970: VideoCounterDelayedOffset = 0;
2971: pVideoRasterDelayed = &STRam[addr_new & ~1]; /* new value for pVideoRaster at the end of Video_CopyScreenLineColor */
2972: Delayed = true;
2973: }
2974:
2975: /* Counter is modified while display is ON, store the bytes offset for Video_CopyScreenLineColor */
2976: /* Even on a real STE, modifying video address in this case will cause artefacts */
1.1.1.11 root 2977: else
2978: {
1.1.1.16 root 2979: VideoCounterDelayedOffset = addr_new - addr_cur;
2980: pVideoRasterDelayed = NULL;
1.1.1.15 root 2981: Delayed = true;
1.1.1.11 root 2982: }
2983:
1.1.1.16 root 2984: LOG_TRACE(TRACE_VIDEO_STE , "write ste video %x val=0x%x video_old=%x video_new=%x offset=%x delayed=%s"
2985: " video_cyc_w=%d line_cyc_w=%d @ nHBL=%d/video_hbl_w=%d pc=%x instr_cyc=%d\n" ,
2986: IoAccessCurrentAddress, AddrByte, addr_cur , addr_new , VideoCounterDelayedOffset , Delayed ? "yes" : "no" ,
1.1.1.15 root 2987: FrameCycles, LineCycles, nHBL, HblCounterVideo, M68000_GetPC(), CurrentInstrCycles );
1.1.1.9 root 2988: }
1.1.1.8 root 2989:
2990: /*-----------------------------------------------------------------------*/
1.1.1.11 root 2991: /**
2992: * Read video sync register (0xff820a)
2993: */
1.1.1.8 root 2994: void Video_Sync_ReadByte(void)
2995: {
1.1.1.17 root 2996: if ( (ConfigureParams.System.nMachineType == MACHINE_ST)
2997: || (ConfigureParams.System.nMachineType == MACHINE_STE)
2998: || (ConfigureParams.System.nMachineType == MACHINE_MEGA_STE) )
1.1.1.14 root 2999: IoMem[0xff820a] |= 0xfc; /* set unused bits 2-7 to 1 */
1.1.1.8 root 3000: }
3001:
3002: /*-----------------------------------------------------------------------*/
1.1.1.11 root 3003: /**
3004: * Read video base address low byte (0xff820d). A plain ST can only store
3005: * screen addresses rounded to 256 bytes (i.e. no lower byte).
3006: */
1.1.1.8 root 3007: void Video_BaseLow_ReadByte(void)
3008: {
1.1.1.11 root 3009: if (ConfigureParams.System.nMachineType == MACHINE_ST)
3010: IoMem[0xff820d] = 0; /* On ST this is always 0 */
1.1.1.9 root 3011:
1.1.1.11 root 3012: /* Note that you should not do anything here for STe because
3013: * VideoBase address is set in an interrupt and would be wrong
3014: * here. It's fine like this.
3015: */
1.1.1.8 root 3016: }
3017:
3018: /*-----------------------------------------------------------------------*/
1.1.1.11 root 3019: /**
3020: * Read video line width register (0xff820f)
3021: */
1.1.1.8 root 3022: void Video_LineWidth_ReadByte(void)
3023: {
1.1.1.11 root 3024: if (ConfigureParams.System.nMachineType == MACHINE_ST)
3025: IoMem[0xff820f] = 0; /* On ST this is always 0 */
1.1.1.18 root 3026:
3027: /* If we're not in STF mode, we use the value already stored in $ff820f */
1.1.1.8 root 3028: }
3029:
3030: /*-----------------------------------------------------------------------*/
1.1.1.11 root 3031: /**
3032: * Read video shifter mode register (0xff8260)
3033: */
1.1.1.8 root 3034: void Video_ShifterMode_ReadByte(void)
3035: {
1.1.1.11 root 3036: if (bUseHighRes)
1.1.1.14 root 3037: IoMem[0xff8260] = 2; /* If mono monitor, force to high resolution */
1.1.1.11 root 3038: else
1.1.1.17 root 3039: IoMem[0xff8260] = VideoShifterByte; /* Only use bits 0 and 1, unused bits 2-7 are set to 0 */
1.1.1.14 root 3040:
1.1.1.17 root 3041: if (ConfigureParams.System.nMachineType == MACHINE_ST)
3042: IoMem[0xff8260] |= 0xfc; /* On STF, set unused bits 2-7 to 1 */
1.1.1.8 root 3043: }
3044:
1.1.1.10 root 3045: /*-----------------------------------------------------------------------*/
1.1.1.11 root 3046: /**
3047: * Read horizontal scroll register (0xff8265)
3048: */
1.1.1.10 root 3049: void Video_HorScroll_Read(void)
3050: {
1.1.1.11 root 3051: IoMem[0xff8265] = HWScrollCount;
1.1.1.10 root 3052: }
1.1.1.8 root 3053:
3054: /*-----------------------------------------------------------------------*/
1.1.1.11 root 3055: /**
3056: * Write video line width register (0xff820f) - STE only.
3057: * Content of LineWidth is added to the shifter counter when display is
3058: * turned off (start of the right border, usually at cycle 376)
3059: */
1.1.1.10 root 3060: void Video_LineWidth_WriteByte(void)
3061: {
1.1.1.11 root 3062: Uint8 NewWidth;
1.1.1.15 root 3063: int FrameCycles, HblCounterVideo, LineCycles;
1.1.1.13 root 3064: int Delayed;
1.1.1.11 root 3065:
1.1.1.15 root 3066: Video_GetPosition_OnWriteAccess ( &FrameCycles , &HblCounterVideo , &LineCycles );
1.1.1.11 root 3067:
3068: NewWidth = IoMem_ReadByte(0xff820f);
3069:
3070: /* We must also check the write does not overlap the end of the line */
1.1.1.15 root 3071: if ( ( ( nHBL == HblCounterVideo ) && ( LineCycles <= ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle ) )
1.1.1.18 root 3072: || ( nHBL < nStartHBL ) || ( nHBL >= nEndHBL + BlankLines ) )
1.1.1.13 root 3073: {
1.1.1.11 root 3074: LineWidth = NewWidth; /* display is on, we can still change */
1.1.1.13 root 3075: NewLineWidth = -1; /* cancel 'pending' change */
1.1.1.15 root 3076: Delayed = false;
1.1.1.13 root 3077: }
1.1.1.11 root 3078: else
1.1.1.13 root 3079: {
1.1.1.11 root 3080: NewLineWidth = NewWidth; /* display is off, can't change LineWidth once in right border */
1.1.1.15 root 3081: Delayed = true;
1.1.1.13 root 3082: }
1.1.1.11 root 3083:
1.1.1.15 root 3084: 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 3085: NewWidth, Delayed ? "yes" : "no" ,
1.1.1.15 root 3086: FrameCycles, LineCycles, nHBL, HblCounterVideo, M68000_GetPC(), CurrentInstrCycles );
1.1.1.10 root 3087: }
3088:
3089: /*-----------------------------------------------------------------------*/
1.1.1.11 root 3090: /**
3091: * Write to video shifter palette registers (0xff8240-0xff825e)
1.1.1.14 root 3092: *
3093: * Note that there's a special "strange" case when writing only to the upper byte
3094: * of the color reg (instead of writing 16 bits at once with .W/.L).
3095: * In that case, the byte written to address x is automatically written
3096: * to address x+1 too (but we shouldn't copy x in x+1 after masking x ; we apply the mask at the end)
3097: * So : move.w #0,$ff8240 -> color 0 is now $000
3098: * move.b #7,$ff8240 -> color 0 is now $707 !
3099: * move.b #$55,$ff8241 -> color 0 is now $755 ($ff8240 remains unchanged)
3100: * move.b #$71,$ff8240 -> color 0 is now $171 (bytes are first copied, then masked)
1.1.1.11 root 3101: */
1.1.1.8 root 3102: static void Video_ColorReg_WriteWord(Uint32 addr)
3103: {
1.1.1.15 root 3104: if (!bUseHighRes && !bUseVDIRes) /* Don't store if hi-res or VDI resolution */
1.1.1.11 root 3105: {
3106: int idx;
3107: Uint16 col;
3108: Video_SetHBLPaletteMaskPointers(); /* Set 'pHBLPalettes' etc.. according cycles into frame */
3109: col = IoMem_ReadWord(addr);
1.1.1.14 root 3110:
3111: /* Handle special case when writing only to the upper byte of the color reg */
3112: if ( ( nIoMemAccessSize == SIZE_BYTE ) && ( ( IoAccessCurrentAddress & 1 ) == 0 ) )
3113: col = ( IoMem_ReadByte(addr) << 8 ) + IoMem_ReadByte(addr); /* copy upper byte into lower byte */
3114:
1.1.1.11 root 3115: if (ConfigureParams.System.nMachineType == MACHINE_ST)
3116: col &= 0x777; /* Mask off to ST 512 palette */
3117: else
3118: col &= 0xfff; /* Mask off to STe 4096 palette */
3119: IoMem_WriteWord(addr, col); /* (some games write 0xFFFF and read back to see if STe) */
3120: Spec512_StoreCyclePalette(col, addr); /* Store colour into CyclePalettes[] */
3121: idx = (addr-0xff8240)/2; /* words */
3122: pHBLPalettes[idx] = col; /* Set colour x */
3123: *pHBLPaletteMasks |= 1 << idx; /* And mask */
3124:
1.1.1.15 root 3125: if (LOG_TRACE_LEVEL(TRACE_VIDEO_COLOR))
1.1.1.11 root 3126: {
1.1.1.15 root 3127: int FrameCycles, HblCounterVideo, LineCycles;
3128:
3129: Video_GetPosition_OnWriteAccess ( &FrameCycles , &HblCounterVideo , &LineCycles );
3130:
3131: 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" ,
3132: addr, col,
3133: FrameCycles, LineCycles, nHBL, HblCounterVideo, M68000_GetPC(), CurrentInstrCycles );
1.1.1.11 root 3134: }
3135:
3136: }
1.1.1.8 root 3137: }
3138:
3139: void Video_Color0_WriteWord(void)
3140: {
1.1.1.11 root 3141: Video_ColorReg_WriteWord(0xff8240);
1.1.1.8 root 3142: }
3143:
3144: void Video_Color1_WriteWord(void)
3145: {
1.1.1.11 root 3146: Video_ColorReg_WriteWord(0xff8242);
1.1.1.8 root 3147: }
3148:
3149: void Video_Color2_WriteWord(void)
3150: {
1.1.1.11 root 3151: Video_ColorReg_WriteWord(0xff8244);
1.1.1.8 root 3152: }
3153:
3154: void Video_Color3_WriteWord(void)
3155: {
1.1.1.11 root 3156: Video_ColorReg_WriteWord(0xff8246);
1.1.1.8 root 3157: }
3158:
3159: void Video_Color4_WriteWord(void)
3160: {
1.1.1.11 root 3161: Video_ColorReg_WriteWord(0xff8248);
1.1.1.8 root 3162: }
3163:
3164: void Video_Color5_WriteWord(void)
3165: {
1.1.1.11 root 3166: Video_ColorReg_WriteWord(0xff824a);
1.1.1.8 root 3167: }
3168:
3169: void Video_Color6_WriteWord(void)
3170: {
1.1.1.11 root 3171: Video_ColorReg_WriteWord(0xff824c);
1.1.1.8 root 3172: }
3173:
3174: void Video_Color7_WriteWord(void)
3175: {
1.1.1.11 root 3176: Video_ColorReg_WriteWord(0xff824e);
1.1.1.8 root 3177: }
3178:
3179: void Video_Color8_WriteWord(void)
3180: {
1.1.1.11 root 3181: Video_ColorReg_WriteWord(0xff8250);
1.1.1.8 root 3182: }
3183:
3184: void Video_Color9_WriteWord(void)
3185: {
1.1.1.11 root 3186: Video_ColorReg_WriteWord(0xff8252);
1.1.1.8 root 3187: }
3188:
3189: void Video_Color10_WriteWord(void)
3190: {
1.1.1.11 root 3191: Video_ColorReg_WriteWord(0xff8254);
1.1.1.8 root 3192: }
3193:
3194: void Video_Color11_WriteWord(void)
3195: {
1.1.1.11 root 3196: Video_ColorReg_WriteWord(0xff8256);
1.1.1.8 root 3197: }
3198:
3199: void Video_Color12_WriteWord(void)
3200: {
1.1.1.11 root 3201: Video_ColorReg_WriteWord(0xff8258);
1.1.1.8 root 3202: }
3203:
3204: void Video_Color13_WriteWord(void)
3205: {
1.1.1.11 root 3206: Video_ColorReg_WriteWord(0xff825a);
1.1.1.8 root 3207: }
3208:
3209: void Video_Color14_WriteWord(void)
3210: {
1.1.1.11 root 3211: Video_ColorReg_WriteWord(0xff825c);
1.1.1.8 root 3212: }
3213:
3214: void Video_Color15_WriteWord(void)
3215: {
1.1.1.11 root 3216: Video_ColorReg_WriteWord(0xff825e);
1.1.1.8 root 3217: }
3218:
3219:
3220: /*-----------------------------------------------------------------------*/
1.1.1.11 root 3221: /**
3222: * Write video shifter mode register (0xff8260)
3223: */
1.1.1.8 root 3224: void Video_ShifterMode_WriteByte(void)
3225: {
1.1.1.18 root 3226: /* Don't store if VDI resolution (and don't store if hi-res?) */
3227: if (!bUseVDIRes /* && !bUseHighRes */)
1.1.1.11 root 3228: {
1.1.1.18 root 3229: /* We only care for lower 2-bits */
3230: VideoShifterByte = IoMem[0xff8260] & 3;
3231: /* 3 is not a valid resolution, use low res instead */
3232: if ( VideoShifterByte == 3 )
1.1.1.13 root 3233: {
3234: VideoShifterByte = 0;
3235: IoMem_WriteByte(0xff8260,0);
3236: }
1.1.1.18 root 3237: }
3238:
3239: if (ConfigureParams.System.nMachineType == MACHINE_FALCON)
3240: {
3241: VIDEL_ST_ShiftModeWriteByte();
3242: }
3243: else if (ConfigureParams.System.nMachineType == MACHINE_TT)
3244: {
3245: TTRes = IoMem_ReadByte(0xff8260) & 7;
3246: /* Copy to TT shifter mode register: */
3247: IoMem_WriteByte(0xff8262, TTRes);
3248: }
1.1.1.19! root 3249: else if (!bUseVDIRes) /* ST and STE mode */
1.1.1.18 root 3250: {
1.1.1.11 root 3251: Video_WriteToShifter(VideoShifterByte);
3252: Video_SetHBLPaletteMaskPointers();
3253: *pHBLPaletteMasks &= 0xff00ffff;
3254: /* Store resolution after palette mask and set resolution write bit: */
3255: *pHBLPaletteMasks |= (((Uint32)VideoShifterByte|0x04)<<16);
3256: }
1.1.1.10 root 3257: }
3258:
3259: /*-----------------------------------------------------------------------*/
1.1.1.11 root 3260: /**
1.1.1.13 root 3261: * Handle horizontal scrolling to the left.
3262: * On STE, there're 2 registers that can scroll the line :
3263: * - $ff8264 : scroll without prefetch
1.1.1.14 root 3264: * - $ff8265 : scroll with prefetch
1.1.1.13 root 3265: * Both registers will scroll the line to the left by skipping the amount
3266: * of pixels in $ff8264 or $ff8265 (from 0 to 15).
3267: * As some pixels will be skipped, this means the shifter needs to read
3268: * 16 other pixels in advance in some internal registers to have an uninterrupted flow of pixels.
3269: *
1.1.1.14 root 3270: * These 16 pixels can be prefetched before the display starts (on cycle 56 for example) when using
1.1.1.13 root 3271: * $ff8265 to scroll the line. In that case 8 more bytes per line (low res) will be read. Most programs
3272: * are using $ff8265 to scroll the line.
3273: *
3274: * When using $ff8264, the next 16 pixels will not be prefetched before the display
3275: * starts, they will be read when the display normally starts (cycle 56). While
3276: * reading these 16 pixels, the shifter won't be able to display anything, which will
3277: * result in 16 pixels having the color 0. So, reading the 16 pixels will in fact delay
3278: * the real start of the line, which will look as if it started 16 pixels later. As the
3279: * shifter will stop the display at cycle 56+320 anyway, this means the last 16 pixels
3280: * of each line won't be displayed and you get the equivalent of a shorter 304 pixels line.
3281: * As a consequence, this register is rarely used to scroll the line.
3282: *
3283: * By writing a value > 0 in $ff8265 (to start prefetching) and immediatly after a value of 0
3284: * in $ff8264 (no scroll and no prefetch), it's possible to fill the internal registers used
3285: * for the scrolling even if scrolling is set to 0. In that case, the shifter will start displaying
3286: * each line 16 pixels earlier (as the data are already available in the internal registers).
3287: * This allows to have 336 pixels per line (instead of 320) for all the remaining lines on the screen.
3288: *
3289: * Although some programs are using this sequence :
3290: * move.w #1,$ffff8264 ; Word access!
3291: * clr.b $ffff8264 ; Byte access!
3292: * It is also possible to add 16 pixels by doing :
3293: * move.b #X,$ff8265 ; with X > 0
3294: * move.b #0,$ff8264
1.1.1.11 root 3295: * Some games (Obsession, Skulls) and demos (Pacemaker by Paradox) use this
3296: * feature to increase the resolution, so we have to emulate this bug, too!
1.1.1.13 root 3297: *
3298: * So considering a low res line of 320 pixels (160 bytes) :
3299: * - if both $ff8264/65 are 0, no scrolling happens, the shifter reads 160 bytes and displays 320 pixels (same as STF)
3300: * - if $ff8265 > 0, line is scrolled, the shifter reads 168 bytes and displays 320 pixels.
3301: * - if $ff8264 > 0, line is scrolled, the shifter reads 160 bytes and displays 304 pixels,
3302: * the display starts 16 pixels later.
3303: * - if $ff8265 > 0 and then $ff8264 = 0, there's no scrolling, the shifter reads 168 bytes and displays 336 pixels,
3304: * the display starts 16 pixels earlier.
1.1.1.11 root 3305: */
1.1.1.13 root 3306:
3307: void Video_HorScroll_Write_8264(void)
3308: {
3309: Video_HorScroll_Write();
3310: }
3311:
3312: void Video_HorScroll_Write_8265(void)
3313: {
3314: Video_HorScroll_Write();
3315: }
3316:
1.1.1.10 root 3317: void Video_HorScroll_Write(void)
3318: {
1.1.1.13 root 3319: Uint32 RegAddr;
1.1.1.11 root 3320: Uint8 ScrollCount;
1.1.1.13 root 3321: Uint8 Prefetch;
1.1.1.15 root 3322: int FrameCycles, HblCounterVideo, LineCycles;
3323: bool Add16px = false;
1.1.1.13 root 3324: static Uint8 LastVal8265 = 0;
3325: int Delayed;
3326:
1.1.1.15 root 3327: Video_GetPosition_OnWriteAccess ( &FrameCycles , &HblCounterVideo , &LineCycles );
1.1.1.10 root 3328:
1.1.1.13 root 3329: RegAddr = IoAccessCurrentAddress; /* 0xff8264 or 0xff8265 */
3330: ScrollCount = IoMem[ RegAddr ];
1.1.1.11 root 3331: ScrollCount &= 0x0f;
1.1.1.10 root 3332:
1.1.1.13 root 3333: if ( RegAddr == 0xff8264 )
3334: {
3335: Prefetch = 0; /* scroll without prefetch */
1.1.1.15 root 3336: LastCycleScroll8264 = FrameCycles;
1.1.1.11 root 3337:
1.1.1.15 root 3338: ShifterFrame.Scroll8264Pos.VBL = nVBLs;
3339: ShifterFrame.Scroll8264Pos.FrameCycles = FrameCycles;
3340: ShifterFrame.Scroll8264Pos.HBL = HblCounterVideo;
3341: ShifterFrame.Scroll8264Pos.LineCycles = LineCycles;
3342:
3343: if ( ( ScrollCount == 0 ) && ( LastVal8265 > 0 )
3344: && ( ShifterFrame.Scroll8265Pos.VBL > 0 ) /* a write to ff8265 has been made */
3345: && ( ShifterFrame.Scroll8265Pos.VBL == ShifterFrame.Scroll8264Pos.VBL ) /* during the same VBL */
3346: && ( ShifterFrame.Scroll8264Pos.FrameCycles - ShifterFrame.Scroll8265Pos.FrameCycles <= 40 ) )
1.1.1.13 root 3347: {
1.1.1.15 root 3348: LOG_TRACE(TRACE_VIDEO_BORDER_H , "detect ste left+16 pixels\n" );
3349: Add16px = true;
1.1.1.13 root 3350: }
3351: }
3352: else
1.1.1.11 root 3353: {
1.1.1.13 root 3354: Prefetch = 1; /* scroll with prefetch */
1.1.1.15 root 3355: LastCycleScroll8265 = FrameCycles;
3356:
3357: ShifterFrame.Scroll8265Pos.VBL = nVBLs;
3358: ShifterFrame.Scroll8265Pos.FrameCycles = FrameCycles;
3359: ShifterFrame.Scroll8265Pos.HBL = HblCounterVideo;
3360: ShifterFrame.Scroll8265Pos.LineCycles = LineCycles;
3361:
1.1.1.13 root 3362: LastVal8265 = ScrollCount;
1.1.1.15 root 3363: Add16px = false;
1.1.1.11 root 3364: }
1.1.1.13 root 3365:
3366:
3367: /* If the write was made before display starts on the current line, then */
3368: /* we can still change the value now. Else, the new values will be used */
3369: /* for line n+1. */
3370: /* We must also check the write does not overlap the end of the line */
1.1.1.15 root 3371: if ( ( ( LineCycles <= LINE_START_CYCLE_50 ) && ( nHBL == HblCounterVideo ) )
1.1.1.18 root 3372: || ( nHBL < nStartHBL ) || ( nHBL >= nEndHBL + BlankLines ) )
1.1.1.11 root 3373: {
1.1.1.13 root 3374: HWScrollCount = ScrollCount; /* display has not started, we can still change */
3375: HWScrollPrefetch = Prefetch;
3376: bSteBorderFlag = Add16px;
3377: NewHWScrollCount = -1; /* cancel 'pending' change */
1.1.1.15 root 3378: Delayed = false;
1.1.1.11 root 3379: }
3380: else
3381: {
1.1.1.13 root 3382: NewHWScrollCount = ScrollCount; /* display has started, can't change HWScrollCount now */
3383: NewHWScrollPrefetch = Prefetch;
3384: if ( Add16px )
3385: NewSteBorderFlag = 1;
3386: else
3387: NewSteBorderFlag = 0;
1.1.1.15 root 3388: Delayed = true;
1.1.1.11 root 3389: }
3390:
1.1.1.15 root 3391: 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 3392: RegAddr , ScrollCount, Delayed ? "yes" : "no" ,
1.1.1.15 root 3393: FrameCycles, LineCycles, nHBL, HblCounterVideo, M68000_GetPC(), CurrentInstrCycles );
1.1.1.13 root 3394: }
1.1.1.11 root 3395:
3396: /*-----------------------------------------------------------------------*/
3397: /**
3398: * Write to TT shifter mode register (0xff8262)
3399: */
3400: void Video_TTShiftMode_WriteWord(void)
3401: {
3402: TTRes = IoMem_ReadByte(0xff8262) & 7;
3403:
3404: /*fprintf(stderr, "Write to FF8262: %x, res=%i\n", IoMem_ReadWord(0xff8262), TTRes);*/
3405:
3406: /* Is it an ST compatible resolution? */
3407: if (TTRes <= 2)
3408: {
3409: IoMem_WriteByte(0xff8260, TTRes);
3410: Video_ShifterMode_WriteByte();
3411: }
3412: }
3413:
3414: /*-----------------------------------------------------------------------*/
3415: /**
3416: * Write to TT color register (0xff8400)
3417: */
3418: void Video_TTColorRegs_WriteWord(void)
3419: {
1.1.1.15 root 3420: bTTColorsSync = false;
1.1.1.11 root 3421: }
3422:
3423: /*-----------------------------------------------------------------------*/
3424: /**
1.1.1.15 root 3425: * Write to ST color register on TT (0xff8240)
1.1.1.11 root 3426: */
3427: void Video_TTColorSTRegs_WriteWord(void)
3428: {
1.1.1.15 root 3429: bTTColorsSTSync = false;
1.1.1.8 root 3430: }
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