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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). */
1.1.1.11 root 310:
1.1.1.12 root 311:
1.1.1.15 root 312: const char Video_fileid[] = "Hatari video.c : " __DATE__ " " __TIME__;
1.1 root 313:
1.1.1.7 root 314: #include <SDL_endian.h>
1.1.1.4 root 315:
1.1 root 316: #include "main.h"
1.1.1.6 root 317: #include "configuration.h"
1.1.1.10 root 318: #include "cycles.h"
1.1 root 319: #include "fdc.h"
1.1.1.16 root 320: #include "cycInt.h"
1.1.1.8 root 321: #include "ioMem.h"
1.1.1.4 root 322: #include "keymap.h"
1.1 root 323: #include "m68000.h"
324: #include "memorySnapShot.h"
325: #include "mfp.h"
1.1.1.11 root 326: #include "printer.h"
1.1 root 327: #include "screen.h"
1.1.1.13 root 328: #include "screenSnapShot.h"
1.1 root 329: #include "shortcut.h"
330: #include "sound.h"
1.1.1.17 root 331: #include "dmaSnd.h"
1.1 root 332: #include "spec512.h"
333: #include "stMemory.h"
334: #include "vdi.h"
335: #include "video.h"
336: #include "ymFormat.h"
1.1.1.11 root 337: #include "falcon/videl.h"
338: #include "falcon/hostscreen.h"
1.1.1.16 root 339: #include "avi_record.h"
1.1.1.4 root 340:
341:
1.1.1.11 root 342: /* The border's mask allows to keep track of all the border tricks */
343: /* applied to one video line. The masks for all lines are stored in the array */
344: /* ScreenBorderMask[]. */
345: /* - bits 0-15 are used to describe the border tricks. */
346: /* - bits 20-23 are used to store the bytes offset to apply for some particular */
1.1.1.15 root 347: /* tricks (for example med res overscan can shift display by 0 or 2 bytes */
348: /* depending on when the switch to med res is done after removing the left */
1.1.1.11 root 349: /* border). */
350:
1.1.1.14 root 351: #define BORDERMASK_NONE 0x00 /* no effect on this line */
1.1.1.11 root 352: #define BORDERMASK_LEFT_OFF 0x01 /* removal of left border with hi/lo res switch -> +26 bytes */
353: #define BORDERMASK_LEFT_PLUS_2 0x02 /* line starts earlier in 60 Hz -> +2 bytes */
354: #define BORDERMASK_STOP_MIDDLE 0x04 /* line ends in hires at cycle 160 -> -106 bytes */
355: #define BORDERMASK_RIGHT_MINUS_2 0x08 /* line ends earlier in 60 Hz -> -2 bytes */
356: #define BORDERMASK_RIGHT_OFF 0x10 /* removal of right border -> +44 bytes */
357: #define BORDERMASK_RIGHT_OFF_FULL 0x20 /* full removal of right border and next left border -> +22 bytes */
1.1.1.15 root 358: #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 359: #define BORDERMASK_EMPTY_LINE 0x80 /* 60/50 Hz switch prevents the line to start, video counter is not incremented */
1.1.1.15 root 360: #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 361: #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 362: #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 363:
364:
365: int STRes = ST_LOW_RES; /* current ST resolution */
366: int TTRes; /* TT shifter resolution mode */
1.1.1.13 root 367: int nFrameSkips; /* speed up by skipping video frames */
1.1.1.9 root 368:
1.1.1.13 root 369: bool bUseHighRes; /* Use hi-res (ie Mono monitor) */
1.1 root 370: int OverscanMode; /* OVERSCANMODE_xxxx for current display frame */
1.1.1.17 root 371: Uint16 HBLPalettes[HBL_PALETTE_LINES]; /* 1x16 colour palette per screen line, +1 line just incase write after line 200 */
1.1.1.8 root 372: Uint16 *pHBLPalettes; /* Pointer to current palette lists, one per HBL */
1.1.1.17 root 373: Uint32 HBLPaletteMasks[HBL_PALETTE_MASKS]; /* Bit mask of palette colours changes, top bit set is resolution change */
1.1.1.9 root 374: Uint32 *pHBLPaletteMasks;
1.1.1.15 root 375: int nScreenRefreshRate = 50; /* 50 or 60 Hz in color, 71 Hz in mono */
1.1.1.8 root 376: Uint32 VideoBase; /* Base address in ST Ram for screen (read on each VBL) */
1.1.1.9 root 377:
1.1.1.11 root 378: int nVBLs; /* VBL Counter */
379: int nHBL; /* HBL line */
380: int nStartHBL; /* Start HBL for visible screen */
381: int nEndHBL; /* End HBL for visible screen */
1.1.1.10 root 382: int nScanlinesPerFrame = 313; /* Number of scan lines per frame */
383: int nCyclesPerLine = 512; /* Cycles per horizontal line scan */
1.1.1.13 root 384: static int nFirstVisibleHbl = FIRST_VISIBLE_HBL_50HZ; /* The first line of the ST screen that is copied to the PC screen buffer */
385: 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 386: static int CyclesPerVBL = 313*512; /* Number of cycles per VBL */
1.1.1.10 root 387:
1.1.1.13 root 388: static Uint8 HWScrollCount; /* HW scroll pixel offset, STE only (0...15) */
389: static int NewHWScrollCount = -1; /* Used in STE mode when writing to the scrolling registers $ff8264/65 */
390: static Uint8 HWScrollPrefetch; /* 0 when scrolling with $ff8264, 1 when scrolling with $ff8265 */
391: static int NewHWScrollPrefetch = -1; /* Used in STE mode when writing to the scrolling registers $ff8264/65 */
392: static Uint8 LineWidth; /* Scan line width add, STe only (words, minus 1) */
393: static int NewLineWidth = -1; /* Used in STE mode when writing to the line width register $ff820f */
1.1.1.16 root 394: static int VideoCounterDelayedOffset = 0; /* Used in STE mode when changing video counter while display is on */
395: 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 396: static Uint8 *pVideoRaster; /* Pointer to Video raster, after VideoBase in PC address space. Use to copy data on HBL */
397: static Uint8 VideoShifterByte; /* VideoShifter (0xff8260) value store in video chip */
1.1.1.15 root 398: static bool bSteBorderFlag; /* true when screen width has been switched to 336 (e.g. in Obsession) */
1.1.1.13 root 399: static int NewSteBorderFlag = -1; /* New value for next line */
400: static bool bTTColorsSync, bTTColorsSTSync; /* whether TT colors need convertion to SDL */
1.1 root 401:
1.1.1.17 root 402: static int LastCycleScroll8264; /* value of Cycles_GetCounterOnWriteAccess last time ff8264 was set for the current VBL */
403: static int LastCycleScroll8265; /* value of Cycles_GetCounterOnWriteAccess last time ff8265 was set for the current VBL */
404:
405: static int LineRemoveTopCycle = LINE_REMOVE_TOP_CYCLE_STF;
406: static int LineRemoveBottomCycle = LINE_REMOVE_BOTTOM_CYCLE_STF;
407: static int RestartVideoCounterCycle = RESTART_VIDEO_COUNTER_CYCLE_STF;
408: static int VblVideoCycleOffset = VBL_VIDEO_CYCLE_OFFSET_STF;
1.1.1.13 root 409:
1.1.1.15 root 410: int LastCycleHblException; /* value of Cycles_GetCounter last time a level 2 interrupt was executed by the CPU */
411:
1.1.1.13 root 412: int LineTimerBCycle = LINE_END_CYCLE_50 + TIMERB_VIDEO_CYCLE_OFFSET; /* position of the Timer B interrupt on active lines */
1.1.1.15 root 413: int TimerBEventCountCycleStart = -1; /* value of Cycles_GetCounterOnWriteAccess last time timer B was started for the current VBL */
1.1 root 414:
1.1.1.14 root 415: #define HBL_JITTER_MAX_POS 5
416: int HblJitterIndex = 0;
417: int HblJitterArray[] = { 8,4,4,0,0 }; /* measured on STF */
418: int HblJitterArrayPending[] = { 4,4,4,4,4 }; // { 8,8,12,8,12 }; /* measured on STF, not always accurate */
419: #define VBL_JITTER_MAX_POS 5
420: int VblJitterIndex = 0;
421: int VblJitterArray[] = { 8,0,4,0,4 }; /* measured on STF */
422: int VblJitterArrayPending[] = { 8,8,12,8,12 }; /* not verified on STF, use the same as HBL */
423:
1.1.1.18! root 424: int BlankLines = 0; /* Number of empty line with no signal (by switching hi/lo near cycles 500) */
1.1.1.12 root 425:
1.1.1.15 root 426:
427: typedef struct
428: {
429: int VBL; /* VBL for this Pos (or -1 if Pos not defined for now) */
430: int FrameCycles; /* Number of cycles since this VBL */
431: int HBL; /* HBL in the VBL */
432: int LineCycles; /* cycles in the HBL */
433: } SHIFTER_POS;
434:
435:
436: typedef struct
437: {
438: int StartCycle; /* first cycle of this line, as returned by Cycles_GetCounter */
439:
440: Uint32 BorderMask; /* borders' states for this line */
441: int DisplayPixelShift; /* number of pixels to shift the whole line (<0 shift to the left, >0 shift to the right) */
442: /* On STF, this is obtained when switching hi/med for a variable number of cycles, */
443: /* but just removing left border will shift the line too. */
444:
445: int DisplayStartCycle; /* cycle where display starts for this line (0-512) : 0, 52 or 56 */
446: int DisplayEndCycle; /* cycle where display ends for this line (0-512) : 0, 160, 372, 376, 460 or 512 */
447: int DisplayBytes; /* how many bytes to display for this line */
448:
449: } SHIFTER_LINE;
450:
451:
452: typedef struct
453: {
454: int HBL_CyclePos; /* cycle position for the HBL int (depends on freq/res) */
455: int TimerB_CyclePos; /* cycle position for the Timer B int (depends on freq/res) */
456:
457: int Freq; /* value of ff820a & 2, or -1 if not set */
458: int Res; /* value of ff8260 & 3, or -1 if not set */
459: SHIFTER_POS FreqPos50; /* position of latest freq change to 50 Hz*/
460: SHIFTER_POS FreqPos60; /* position of latest freq change to 60 Hz*/
461: SHIFTER_POS ResPosLo; /* position of latest change to low res */
462: SHIFTER_POS ResPosMed; /* position of latest change to med res */
463: SHIFTER_POS ResPosHi; /* position of latest change to high res */
464:
465: SHIFTER_POS Scroll8264Pos; /* position of latest write to $ff8264 */
466: SHIFTER_POS Scroll8265Pos; /* position of latest write to $ff8265 */
467:
468: SHIFTER_LINE ShifterLines[ MAX_SCANLINES_PER_FRAME ];
469: } SHIFTER_FRAME;
470:
471:
472: SHIFTER_FRAME ShifterFrame;
473:
474:
475:
476: /*--------------------------------------------------------------*/
477: /* Local functions prototypes */
478: /*--------------------------------------------------------------*/
479:
480: static void Video_SetSystemTimings ( void );
481:
482: static Uint32 Video_CalculateAddress ( void );
1.1.1.16 root 483: static int Video_GetMMUStartCycle ( int DisplayStartCycle );
1.1.1.15 root 484: static void Video_WriteToShifter ( Uint8 Res );
485: static void Video_Sync_SetDefaultStartEnd ( Uint8 Freq , int HblCounterVideo , int LineCycles );
486:
487: static int Video_HBL_GetPos ( void );
1.1.1.18! root 488: static int Video_TimerB_GetDefaultPos ( void );
1.1.1.15 root 489: static void Video_EndHBL ( void );
490: static void Video_StartHBL ( void );
491:
492: static void Video_StoreFirstLinePalette(void);
493: static void Video_StoreResolution(int y);
494: static void Video_CopyScreenLineMono(void);
495: static void Video_CopyScreenLineColor(void);
496: static void Video_CopyVDIScreen(void);
497: static void Video_SetHBLPaletteMaskPointers(void);
498:
499: static void Video_UpdateTTPalette(int bpp);
500: static void Video_DrawScreen(void);
501:
502: static void Video_ResetShifterTimings(void);
503: static void Video_InitShifterLines(void);
504: static void Video_ClearOnVBL(void);
505:
506: static void Video_AddInterrupt ( int Pos , interrupt_id Handler );
507: static void Video_AddInterruptHBL ( int Pos );
508:
509: static void Video_ColorReg_WriteWord(Uint32 addr);
510:
511:
1.1 root 512: /*-----------------------------------------------------------------------*/
1.1.1.11 root 513: /**
514: * Save/Restore snapshot of local variables('MemorySnapShot_Store' handles type)
515: */
1.1.1.13 root 516: void Video_MemorySnapShot_Capture(bool bSave)
1.1 root 517: {
1.1.1.11 root 518: /* Save/Restore details */
519: MemorySnapShot_Store(&VideoShifterByte, sizeof(VideoShifterByte));
520: MemorySnapShot_Store(&TTRes, sizeof(TTRes));
521: MemorySnapShot_Store(&bUseHighRes, sizeof(bUseHighRes));
522: MemorySnapShot_Store(&nVBLs, sizeof(nVBLs));
523: MemorySnapShot_Store(&nHBL, sizeof(nHBL));
524: MemorySnapShot_Store(&nStartHBL, sizeof(nStartHBL));
525: MemorySnapShot_Store(&nEndHBL, sizeof(nEndHBL));
526: MemorySnapShot_Store(&OverscanMode, sizeof(OverscanMode));
527: MemorySnapShot_Store(HBLPalettes, sizeof(HBLPalettes));
528: MemorySnapShot_Store(HBLPaletteMasks, sizeof(HBLPaletteMasks));
529: MemorySnapShot_Store(&VideoBase, sizeof(VideoBase));
530: MemorySnapShot_Store(&LineWidth, sizeof(LineWidth));
531: MemorySnapShot_Store(&HWScrollCount, sizeof(HWScrollCount));
532: MemorySnapShot_Store(&pVideoRaster, sizeof(pVideoRaster));
533: MemorySnapShot_Store(&nScanlinesPerFrame, sizeof(nScanlinesPerFrame));
534: MemorySnapShot_Store(&nCyclesPerLine, sizeof(nCyclesPerLine));
535: MemorySnapShot_Store(&nFirstVisibleHbl, sizeof(nFirstVisibleHbl));
536: MemorySnapShot_Store(&bSteBorderFlag, sizeof(bSteBorderFlag));
1.1.1.14 root 537: MemorySnapShot_Store(&HblJitterIndex, sizeof(HblJitterIndex));
538: MemorySnapShot_Store(&VblJitterIndex, sizeof(VblJitterIndex));
1.1.1.15 root 539: MemorySnapShot_Store(&ShifterFrame, sizeof(ShifterFrame));
540: }
541:
542:
543: /*-----------------------------------------------------------------------*/
544: /**
545: * Reset video chip
546: */
547: void Video_Reset(void)
548: {
549: /* NOTE! Must reset all of these register type things here!!!! */
550:
551: /* Are we in high-res? */
552: if (bUseHighRes)
553: VideoShifterByte = ST_HIGH_RES; /* Boot up for mono monitor */
554: else
555: VideoShifterByte = ST_LOW_RES;
556: if (bUseVDIRes)
557: VideoShifterByte = VDIRes;
558:
559: /* Set system specific timings */
560: Video_SetSystemTimings();
561:
562: /* Reset VBL counter */
563: nVBLs = 0;
564: /* Reset addresses */
565: VideoBase = 0L;
566:
567: /* Reset shifter's state variables */
568: ShifterFrame.Freq = -1;
569: ShifterFrame.Res = -1;
570: ShifterFrame.FreqPos50.VBL = -1;
571: ShifterFrame.FreqPos60.VBL = -1;
572: ShifterFrame.ResPosLo.VBL = -1;
573: ShifterFrame.ResPosMed.VBL = -1;
574: ShifterFrame.ResPosHi.VBL = -1;
575: ShifterFrame.Scroll8264Pos.VBL = -1;
576: ShifterFrame.Scroll8265Pos.VBL = -1;
577:
578: Video_InitShifterLines ();
579:
580: /* Reset STE screen variables */
581: LineWidth = 0;
582: HWScrollCount = 0;
583: bSteBorderFlag = false;
584:
585: NewLineWidth = -1; /* cancel pending modifications set before the reset */
586: NewHWScrollCount = -1;
587:
1.1.1.16 root 588: VideoCounterDelayedOffset = 0;
589: pVideoRasterDelayed = NULL;
590:
1.1.1.15 root 591: /* Reset jitter indexes */
592: HblJitterIndex = 0;
593: VblJitterIndex = 0;
594:
595: /* Clear framecycles counter */
596: Cycles_SetCounter(CYCLES_COUNTER_VIDEO, 0);
597:
598: /* Clear ready for new VBL */
599: Video_ClearOnVBL();
600: }
601:
602:
603: /*-----------------------------------------------------------------------*/
604: /**
605: * Reset the GLUE chip responsible for generating the H/V sync signals.
606: * When the 68000 RESET instruction is called, frequency and resolution
607: * should be reset to 0.
608: */
609: void Video_Reset_Glue(void)
610: {
611: IoMem_WriteByte(0xff820a,0); /* video freq */
612: IoMem_WriteByte(0xff8260,0); /* video res */
1.1 root 613: }
614:
1.1.1.8 root 615:
1.1 root 616: /*-----------------------------------------------------------------------*/
1.1.1.12 root 617: /*
618: * Set specific video timings, depending on the system being emulated.
619: */
1.1.1.15 root 620: static void Video_SetSystemTimings(void)
1.1.1.12 root 621: {
622: if ( ConfigureParams.System.nMachineType == MACHINE_ST )
623: {
624: LineRemoveTopCycle = LINE_REMOVE_TOP_CYCLE_STF;
625: LineRemoveBottomCycle = LINE_REMOVE_BOTTOM_CYCLE_STF;
1.1.1.13 root 626: RestartVideoCounterCycle = RESTART_VIDEO_COUNTER_CYCLE_STF;
627: VblVideoCycleOffset = VBL_VIDEO_CYCLE_OFFSET_STF;
1.1.1.12 root 628: }
629:
630: else /* STE, Falcon, TT */
631: {
632: LineRemoveTopCycle = LINE_REMOVE_TOP_CYCLE_STE;
633: LineRemoveBottomCycle = LINE_REMOVE_BOTTOM_CYCLE_STE;
1.1.1.13 root 634: RestartVideoCounterCycle = RESTART_VIDEO_COUNTER_CYCLE_STE;
635: VblVideoCycleOffset = VBL_VIDEO_CYCLE_OFFSET_STE;
1.1.1.12 root 636: }
637: }
638:
639:
640: /*-----------------------------------------------------------------------*/
1.1.1.11 root 641: /**
1.1.1.15 root 642: * Convert the elapsed number of cycles since the start of the VBL
643: * into the corresponding HBL number and the cycle position in the current
644: * HBL. We use the starting cycle position of the closest HBL to compute
645: * the cycle position on the line (this allows to mix lines with different
646: * values for nCyclesPerLine).
647: * We can have 2 cases on the limit where the real video line count can be
648: * different from nHBL :
649: * - when reading video address between cycle 0 and 12, LineCycle will be <0,
650: * so we need to use the data from line nHBL-1
651: * - if LineCycle >= nCyclesPerLine, this means the HBL int was not processed
652: * yet, so the video line number is in fact nHBL+1
653: */
654:
655: void Video_ConvertPosition ( int FrameCycles , int *pHBL , int *pLineCycles )
656: {
1.1.1.16 root 657: if ( 0 && FrameCycles >= CyclesPerVBL ) /* rare case between end of last hbl and start of next VBL (during 64 cycles) */
1.1.1.15 root 658: {
1.1.1.16 root 659: *pHBL = ( FrameCycles - CyclesPerVBL ) / nCyclesPerLine;
660: *pLineCycles = ( FrameCycles - CyclesPerVBL ) % nCyclesPerLine;
661: //fprintf ( stderr , "out of vbl FrameCycles %d CyclesPerVBL %d nHBL=%d %d %d\n" , FrameCycles , CyclesPerVBL, nHBL , *pHBL , *pLineCycles );
1.1.1.15 root 662: }
1.1.1.16 root 663:
664: else /* most common case */
1.1.1.15 root 665: {
1.1.1.16 root 666: *pHBL = nHBL;
667: *pLineCycles = FrameCycles - ShifterFrame.ShifterLines[ nHBL ].StartCycle;
1.1.1.15 root 668:
1.1.1.16 root 669: if ( *pLineCycles < 0 ) /* reading from the previous video line */
670: {
671: *pHBL = nHBL-1;
672: *pLineCycles = FrameCycles - ShifterFrame.ShifterLines[ nHBL-1 ].StartCycle;
673: }
674:
675: else if ( *pLineCycles >= nCyclesPerLine ) /* reading on the next line, but HBL int was delayed */
676: {
677: *pHBL = nHBL+1;
678: *pLineCycles -= nCyclesPerLine;
679: }
680: }
1.1.1.15 root 681:
682: if ( *pLineCycles < 0 )
683: fprintf ( stderr , "bug nHBL=%d %d %d\n" , nHBL , *pHBL , *pLineCycles );
684:
685: //if ( ( *pHBL != FrameCycles / nCyclesPerLine ) || ( *pLineCycles != FrameCycles % nCyclesPerLine ) )
686: // LOG_TRACE ( TRACE_VIDEO_ADDR , "conv pos %d %d - %d %d\n" , *pHBL , FrameCycles / nCyclesPerLine , *pLineCycles , FrameCycles % nCyclesPerLine );
687: // LOG_TRACE ( TRACE_VIDEO_ADDR , "conv pos %d %d %d\n" , FrameCycles , *pHBL , *pLineCycles );
688: }
689:
690:
691: void Video_GetPosition ( int *pFrameCycles , int *pHBL , int *pLineCycles )
692: {
693: *pFrameCycles = Cycles_GetCounter(CYCLES_COUNTER_VIDEO);
694: Video_ConvertPosition ( *pFrameCycles , pHBL , pLineCycles );
695: }
696:
697:
698: void Video_GetPosition_OnWriteAccess ( int *pFrameCycles , int *pHBL , int *pLineCycles )
699: {
700: *pFrameCycles = Cycles_GetCounterOnWriteAccess(CYCLES_COUNTER_VIDEO);
701: Video_ConvertPosition ( *pFrameCycles , pHBL , pLineCycles );
702: }
703:
704:
705: void Video_GetPosition_OnReadAccess ( int *pFrameCycles , int *pHBL , int *pLineCycles )
706: {
707: *pFrameCycles = Cycles_GetCounterOnReadAccess(CYCLES_COUNTER_VIDEO);
708: Video_ConvertPosition ( *pFrameCycles , pHBL , pLineCycles );
709: }
710:
711:
712: /*-----------------------------------------------------------------------*/
713: /**
1.1.1.11 root 714: * Calculate and return video address pointer.
715: */
1.1.1.15 root 716: static Uint32 Video_CalculateAddress ( void )
1.1 root 717: {
1.1.1.15 root 718: int FrameCycles, HblCounterVideo, LineCycles;
719: int X, NbBytes;
1.1.1.11 root 720: Uint32 VideoAddress; /* Address of video display in ST screen space */
721: int nSyncByte;
722: int LineBorderMask;
723: int PrevSize;
724: int CurSize;
1.1.1.15 root 725: int LineStartCycle , LineEndCycle;
726:
1.1.1.11 root 727:
728: /* Find number of cycles passed during frame */
729: /* We need to substract '12' for correct video address calculation */
1.1.1.15 root 730: FrameCycles = Cycles_GetCounterOnReadAccess(CYCLES_COUNTER_VIDEO) - 12;
1.1.1.11 root 731:
732: /* Now find which pixel we are on (ignore left/right borders) */
1.1.1.15 root 733: Video_ConvertPosition ( FrameCycles , &HblCounterVideo , &LineCycles );
734: X = LineCycles;
1.1.1.11 root 735:
736: nSyncByte = IoMem_ReadByte(0xff820a) & 2; /* only keep bit 1 */
737: if (nSyncByte) /* 50 Hz */
738: {
739: LineStartCycle = LINE_START_CYCLE_50;
740: LineEndCycle = LINE_END_CYCLE_50;
741: }
742: else /* 60 Hz */
743: {
744: LineStartCycle = LINE_START_CYCLE_60;
745: LineEndCycle = LINE_END_CYCLE_60;
746: }
747:
748:
749: /* Top of screen is usually 63 lines from VBL in 50 Hz */
1.1.1.15 root 750: if ( HblCounterVideo < nStartHBL )
1.1.1.11 root 751: {
752: /* pVideoRaster was set during Video_ClearOnVBL using VideoBase */
753: /* and it could also have been modified on STE by writing to ff8205/07/09 */
1.1.1.15 root 754: /* So, we should not use ff8201/ff8203 which are reloaded in ff8205/ff8207 only once per VBL */
755: /* but use pVideoRaster - STRam instead to get current shifter video address */
1.1.1.11 root 756: VideoAddress = pVideoRaster - STRam;
757: }
758:
1.1.1.15 root 759: else if (FrameCycles > RestartVideoCounterCycle)
1.1.1.11 root 760: {
761: /* This is where ff8205/ff8207 are reloaded with the content of ff8201/ff8203 on a real ST */
762: /* (used in ULM DSOTS demos). VideoBase is also reloaded in Video_ClearOnVBL to be sure */
763: VideoBase = (Uint32)IoMem_ReadByte(0xff8201)<<16 | (Uint32)IoMem_ReadByte(0xff8203)<<8;
764: if (ConfigureParams.System.nMachineType != MACHINE_ST)
765: {
766: /* on STe 2 aligned, on Falcon 4 aligned, on TT 8 aligned. We do STe. */
767: VideoBase |= IoMem_ReadByte(0xff820d) & ~1;
768: }
769:
770: VideoAddress = VideoBase;
771: }
772:
773: else
774: {
775: VideoAddress = pVideoRaster - STRam; /* pVideoRaster is updated by Video_CopyScreenLineColor */
776:
777: /* Now find which pixel we are on (ignore left/right borders) */
1.1.1.15 root 778: // X = ( Cycles_GetCounterOnReadAccess(CYCLES_COUNTER_VIDEO) - 12 ) % nCyclesPerLine;
1.1.1.11 root 779:
780: /* Get real video line count (can be different from nHBL) */
1.1.1.15 root 781: // HblCounterVideo = ( Cycles_GetCounterOnReadAccess(CYCLES_COUNTER_VIDEO) - 12 ) / nCyclesPerLine;
1.1.1.11 root 782:
783: /* Correct the case when read overlaps end of line / start of next line */
784: /* Video_CopyScreenLineColor was not called yet to update VideoAddress */
785: /* so we need to determine the size of the previous line to get the */
786: /* correct value of VideoAddress. */
787: PrevSize = 0;
788: if ( HblCounterVideo < nHBL )
789: X = 0;
790: else if ( ( HblCounterVideo > nHBL ) /* HblCounterVideo = nHBL+1 */
791: && ( nHBL >= nStartHBL ) ) /* if nHBL was not visible, PrevSize = 0 */
792: {
1.1.1.15 root 793: LineBorderMask = ShifterFrame.ShifterLines[ HblCounterVideo-1 ].BorderMask; /* get border mask for nHBL */
1.1.1.11 root 794: PrevSize = BORDERBYTES_NORMAL; /* normal line */
795:
796: if (LineBorderMask & BORDERMASK_LEFT_OFF)
797: PrevSize += BORDERBYTES_LEFT;
798: else if (LineBorderMask & BORDERMASK_LEFT_PLUS_2)
799: PrevSize += 2;
800:
801: if (LineBorderMask & BORDERMASK_STOP_MIDDLE)
802: PrevSize -= 106;
803: else if (LineBorderMask & BORDERMASK_RIGHT_MINUS_2)
804: PrevSize -= 2;
805: else if (LineBorderMask & BORDERMASK_RIGHT_OFF)
806: PrevSize += BORDERBYTES_RIGHT;
807:
808: if (LineBorderMask & BORDERMASK_EMPTY_LINE)
809: PrevSize = 0;
810: }
811:
812:
1.1.1.15 root 813: LineBorderMask = ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask;
1.1.1.11 root 814:
815: CurSize = BORDERBYTES_NORMAL; /* normal line */
816:
817: if (LineBorderMask & BORDERMASK_LEFT_OFF)
818: CurSize += BORDERBYTES_LEFT;
819: else if (LineBorderMask & BORDERMASK_LEFT_PLUS_2)
820: CurSize += 2;
1.1.1.16 root 821: else if (bSteBorderFlag) /* bigger line by 8 bytes on the left (STE specific) */
822: CurSize += 8;
823: else if ( ( HWScrollCount > 0 ) && ( HWScrollPrefetch == 1 ) )
824: CurSize += 8; /* 8 more bytes are loaded when scrolling with prefetching */
1.1.1.11 root 825:
826: if (LineBorderMask & BORDERMASK_STOP_MIDDLE)
827: CurSize -= 106;
828: else if (LineBorderMask & BORDERMASK_RIGHT_MINUS_2)
829: CurSize -= 2;
830: else if (LineBorderMask & BORDERMASK_RIGHT_OFF)
831: CurSize += BORDERBYTES_RIGHT;
832: if (LineBorderMask & BORDERMASK_RIGHT_OFF_FULL)
833: CurSize += BORDERBYTES_RIGHT_FULL;
834:
835: if ( LineBorderMask & BORDERMASK_LEFT_PLUS_2)
836: LineStartCycle = LINE_START_CYCLE_60;
837: else if ( LineBorderMask & BORDERMASK_LEFT_OFF )
1.1.1.15 root 838: LineStartCycle = LINE_START_CYCLE_71;
1.1.1.16 root 839: else if ( bSteBorderFlag )
840: LineStartCycle -= 16; /* display starts 16 pixels earlier */
841: else if ( ( HWScrollCount > 0 ) && ( HWScrollPrefetch == 1 ) )
842: LineStartCycle -= 16; /* shifter starts reading 16 pixels earlier when scrolling with prefetching */
1.1.1.11 root 843:
844: LineEndCycle = LineStartCycle + CurSize*2;
845:
846:
847: if ( X < LineStartCycle )
1.1.1.16 root 848: X = LineStartCycle; /* display is disabled in the left border */
1.1.1.11 root 849: else if ( X > LineEndCycle )
1.1.1.16 root 850: {
851: X = LineEndCycle; /* display is disabled in the right border */
852: /* On STE, the Shifter skips the given amount of words as soon as display is disabled */
853: /* (LineWidth is 0 on STF */
854: VideoAddress += LineWidth*2;
855: }
1.1.1.11 root 856:
857: NbBytes = ( (X-LineStartCycle)>>1 ) & (~1); /* 2 cycles per byte */
858:
859:
860: /* when left border is open, we have 2 bytes less than theorical value */
861: /* (26 bytes in left border, which is not a multiple of 4 cycles) */
862: if ( LineBorderMask & BORDERMASK_LEFT_OFF )
863: NbBytes -= 2;
864:
865: if ( LineBorderMask & BORDERMASK_EMPTY_LINE )
866: NbBytes = 0;
867:
1.1.1.16 root 868: /* Add line cycles if we have not reached end of screen yet */
1.1.1.18! root 869: if ( HblCounterVideo < nEndHBL + BlankLines )
1.1.1.11 root 870: VideoAddress += PrevSize + NbBytes;
871: }
872:
1.1.1.16 root 873: LOG_TRACE(TRACE_VIDEO_ADDR , "video base=%x raster=%x addr=%x video_cyc=%d "
874: "line_cyc=%d/X=%d @ nHBL=%d/video_hbl=%d %d<->%d pc=%x instr_cyc=%d\n",
875: VideoBase, (int)(pVideoRaster - STRam), VideoAddress,
876: Cycles_GetCounter(CYCLES_COUNTER_VIDEO), LineCycles, X, nHBL,
877: HblCounterVideo, LineStartCycle, LineEndCycle, M68000_GetPC(), CurrentInstrCycles);
1.1.1.11 root 878:
879: return VideoAddress;
880: }
881:
882:
883: /*-----------------------------------------------------------------------*/
884: /**
1.1.1.16 root 885: * Calculate the cycle where the STF/STE's MMU starts reading
886: * data to send them to the shifter.
887: * On STE, if hscroll is used, prefetch will cause this position to
888: * happen 16 cycles earlier.
889: * This function should use the same logic as in Video_CalculateAddress.
890: * NOTE : this function is not completly accurate, as even when there's
891: * no hscroll (on STF) the mmu starts reading 16 cycles before display starts.
892: * But it's good enough to emulate writing to ff8205/07/09 on STE.
893: */
894: static int Video_GetMMUStartCycle ( int DisplayStartCycle )
895: {
896: if ( bSteBorderFlag )
897: DisplayStartCycle -= 16; /* display starts 16 pixels earlier */
898: else if ( ( HWScrollCount > 0 ) && ( HWScrollPrefetch == 1 ) )
899: DisplayStartCycle -= 16; /* shifter starts reading 16 pixels earlier when scrolling with prefetching */
900:
901: return DisplayStartCycle;
902: }
903:
904:
905: /*-----------------------------------------------------------------------*/
906: /**
1.1.1.11 root 907: * Write to VideoShifter (0xff8260), resolution bits
908: */
1.1.1.15 root 909: static void Video_WriteToShifter ( Uint8 Res )
1.1 root 910: {
1.1.1.15 root 911: int FrameCycles, HblCounterVideo, LineCycles;
1.1.1.11 root 912:
1.1.1.15 root 913: Video_GetPosition_OnWriteAccess ( &FrameCycles , &HblCounterVideo , &LineCycles );
1.1.1.11 root 914:
1.1.1.15 root 915: 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",
916: Res, FrameCycles, LineCycles, nHBL, HblCounterVideo, M68000_GetPC(), CurrentInstrCycles );
1.1.1.11 root 917:
918:
1.1.1.13 root 919: /* Ignore consecutive writes of the same value */
1.1.1.15 root 920: if ( Res == ShifterFrame.Res )
1.1.1.13 root 921: return; /* do nothing */
922:
1.1.1.15 root 923:
924: if ( Res == 0x02 ) /* switch to high res */
925: {
926: if ( LineCycles < ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle ) /* start could be 0,52,56 */
927: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle = LINE_START_CYCLE_71;
928:
929: if ( ( LineCycles < ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle ) /* end could be 160,372,376,460 */
930: && ( LineCycles < LINE_END_CYCLE_71 ) )
931: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle = LINE_END_CYCLE_71;
932: }
933: else /* switch to lo/med res */
934: {
935: /* In lo/med res, display start/end depends on the freq register in $ff820a */
936: Video_Sync_SetDefaultStartEnd ( IoMem[0xff820a] & 2 , HblCounterVideo , LineCycles );
937: }
938:
939:
1.1.1.11 root 940: /* Remove left border : +26 bytes */
1.1.1.15 root 941: /* This can be done with a hi/lo res switch or a hi/med res switch */
942: if ( ( ShifterFrame.Res == 0x02 ) && ( Res == 0x00 ) /* switched from hi res to lo res */
1.1.1.16 root 943: // && ( LineCycles >= 12 ) /* switch back to low res should be after cycle 8 */
1.1.1.15 root 944: && ( LineCycles <= (LINE_START_CYCLE_71+28) )
1.1.1.17 root 945: && ( FrameCycles - ShifterFrame.ResPosHi.FrameCycles <= 32 ) )
1.1.1.15 root 946: {
1.1.1.17 root 947: if ( ( ( ConfigureParams.System.nMachineType == MACHINE_STE ) /* special case for 504/4 on STE -> add 20 bytes to left border */
948: || ( ConfigureParams.System.nMachineType == MACHINE_MEGA_STE ) )
1.1.1.16 root 949: && ( ShifterFrame.ResPosHi.LineCycles == 504 ) && ( LineCycles == 4 ) )
950: {
951: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_LEFT_OFF_2_STE;
952: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle = LINE_START_CYCLE_71+16; /* starts 16 pixels later */
1.1.1.17 root 953: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayPixelShift = -8; /* screen is shifted 8 pixels to the left */
1.1.1.16 root 954: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect remove left 2 ste %d<->%d\n" ,
955: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
956: }
957: else /* other case for STF/STE -> add 26 bytes */
958: {
959: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_LEFT_OFF;
960: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle = LINE_START_CYCLE_71;
961: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayPixelShift = -4; /* screen is shifted 4 pixels to the left */
962: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect remove left %d<->%d\n" ,
963: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
964: }
1.1.1.15 root 965: }
966:
967: if ( ( ShifterFrame.Res == 0x02 ) && ( Res == 0x01 ) /* switched from hi res to med res */
968: && ( LineCycles <= (LINE_START_CYCLE_71+20) )
969: && ( FrameCycles - ShifterFrame.ResPosHi.FrameCycles <= 30 ) )
970: {
971: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_LEFT_OFF_MED; /* a later switch to low res might gives right scrolling */
972: /* By default, this line will be in med res, except if we detect hardware scrolling later */
973: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_OVERSCAN_MED_RES | ( 2 << 20 );
974: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle = LINE_START_CYCLE_71;
975: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect remove left med %d<->%d\n" ,
976: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
977: }
978:
979: /* Empty line switching res on STF : switch to hi res on cycle 28, then go back to med/lo res */
980: /* This creates a 0 byte line, the video counter won't change for this line */
981: else if ( ( ShifterFrame.Res == 0x02 ) /* switched from hi res */
982: && ( FrameCycles - ShifterFrame.ResPosHi.FrameCycles <= 16 )
983: && ( ShifterFrame.ResPosHi.LineCycles == LINE_EMPTY_CYCLE_71_STF )
984: && ( ConfigureParams.System.nMachineType == MACHINE_ST ) )
985: {
986: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_EMPTY_LINE;
987: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle = 0;
988: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle = 0;
989: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect empty line res %d<->%d\n" ,
990: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
991: }
992:
993: /* Empty line switching res on STE (switch is 4 cycles later than on STF) */
994: else if ( ( ShifterFrame.Res == 0x02 ) /* switched from hi res */
995: && ( FrameCycles - ShifterFrame.ResPosHi.FrameCycles <= 16 )
996: && ( ShifterFrame.ResPosHi.LineCycles == LINE_EMPTY_CYCLE_71_STE )
1.1.1.17 root 997: && ( ( ConfigureParams.System.nMachineType == MACHINE_STE )
998: || ( ConfigureParams.System.nMachineType == MACHINE_MEGA_STE ) ) )
1.1.1.15 root 999: {
1000: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_EMPTY_LINE;
1001: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle = 0;
1002: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle = 0;
1003: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect empty line res %d<->%d\n" ,
1004: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
1005: }
1006:
1007: /* Empty line switching res on STF : switch to hi res just before the HBL then go back to lo/med res */
1.1.1.18! root 1008: /* Next HBL will be an ampty line (used in 'No Buddies Land' and 'Delirious Demo IV / NGC') */
1.1.1.15 root 1009: else if ( ( ShifterFrame.Res == 0x02 ) /* switched from hi res */
1.1.1.18! root 1010: && ( ( ShifterFrame.ResPosHi.LineCycles == 500-4 ) || ( ShifterFrame.ResPosHi.LineCycles == 500 ) )
1.1.1.15 root 1011: && ( LineCycles == 508 ) )
1012: {
1.1.1.16 root 1013: ShifterFrame.ShifterLines[ HblCounterVideo+1 ].BorderMask |= BORDERMASK_EMPTY_LINE;
1014: ShifterFrame.ShifterLines[ HblCounterVideo+1 ].DisplayStartCycle = 0;
1015: ShifterFrame.ShifterLines[ HblCounterVideo+1 ].DisplayEndCycle = 0;
1.1.1.18! root 1016: BlankLines++; /* no video signal at all for this line */
1.1.1.16 root 1017: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect empty line res 2 %d<->%d for nHBL=%d\n" ,
1018: ShifterFrame.ShifterLines[ HblCounterVideo+1 ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo+1 ].DisplayEndCycle , nHBL+1 );
1.1.1.15 root 1019: }
1020:
1021: /* Start right border near middle of the line : -106 bytes */
1022: /* Switch to hi res just before the start of the right border in hi res, then go back to lo/mid res */
1023: if ( ( ShifterFrame.Res == 0x02 ) /* switched from hi res */
1024: && ( ShifterFrame.ResPosHi.HBL == HblCounterVideo ) /* switch during the same line */
1025: && ( ShifterFrame.ResPosHi.LineCycles <= LINE_END_CYCLE_71+4 ) /* switched to hi res before cycle 164 */
1026: && ( LineCycles >= LINE_END_CYCLE_71+4 ) ) /* switch to lo res after cycle 164 */
1027: {
1028: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_STOP_MIDDLE;
1029: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle = LINE_END_CYCLE_71;
1030: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect stop middle %d<->%d\n" ,
1031: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
1032: }
1033:
1034: /* Remove right border a second time after removing it a first time. Display will */
1035: /* stop at cycle 512 instead of 460. */
1036: /* This removes left border on next line too (used in 'Enchanted Lands') */
1.1.1.16 root 1037: /* If right border was not removed, then we will get an empty line for the next HBL (used in Beyond by Kruz) */
1038: if ( ( ShifterFrame.Res == 0x02 ) /* switched from hi res */
1039: && ( LineCycles > LINE_END_CYCLE_50_2 ) /* switch to low just after end of right border */
1040: && ( ShifterFrame.ResPosHi.LineCycles <= LINE_END_CYCLE_50_2 ) /* switch to hi just before end of right border */
1041: && ( FrameCycles - ShifterFrame.ResPosHi.FrameCycles <= 20 ) )
1042: {
1043: if ( ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask & BORDERMASK_RIGHT_OFF ) /* Enchanted Lands */
1044: {
1045: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_RIGHT_OFF_FULL;
1046: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle = LINE_END_CYCLE_FULL;
1047: ShifterFrame.ShifterLines[ HblCounterVideo+1 ].BorderMask |= BORDERMASK_LEFT_OFF; /* no left border on next line */
1048: ShifterFrame.ShifterLines[ HblCounterVideo+1 ].DisplayStartCycle = LINE_START_CYCLE_71;
1049: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect remove right full %d<->%d\n" ,
1050: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
1051: }
1052: else /* Pax Plax Parralax in Beyond by Kruz */
1053: {
1054: ShifterFrame.ShifterLines[ HblCounterVideo+1 ].BorderMask = BORDERMASK_EMPTY_LINE;
1055: ShifterFrame.ShifterLines[ HblCounterVideo+1 ].DisplayStartCycle = 0;
1056: ShifterFrame.ShifterLines[ HblCounterVideo+1 ].DisplayEndCycle = 0;
1057: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect empty line res 3 %d<->%d for nHBL=%d\n" ,
1058: ShifterFrame.ShifterLines[ HblCounterVideo+1 ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo+1 ].DisplayEndCycle , nHBL+1 );
1059: }
1.1.1.15 root 1060: }
1061:
1062: /* If left border is opened and we switch to medium resolution during the next cycles, */
1063: /* then we assume a med res overscan line instead of a low res overscan line. */
1064: /* Note that in that case, the switch to med res can shift the display by 0-3 words */
1.1.1.11 root 1065: /* Used in 'No Cooper' greetings by 1984 and 'Punish Your Machine' by Delta Force */
1.1.1.15 root 1066: if ( ( ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask & BORDERMASK_LEFT_OFF )
1067: && ( Res == 0x01 ) )
1.1.1.11 root 1068: {
1.1.1.18! root 1069: if ( ( LineCycles == LINE_LEFT_MED_CYCLE_1 ) /* 'No Cooper' timing */
! 1070: || ( LineCycles == LINE_LEFT_MED_CYCLE_1+16 ) ) /* 'No Cooper' timing while removing bottom border */
1.1.1.11 root 1071: {
1.1.1.15 root 1072: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect med res overscan offset 0 byte\n" );
1073: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_OVERSCAN_MED_RES | ( 0 << 20 );
1.1.1.11 root 1074: }
1.1.1.15 root 1075: else if ( LineCycles == LINE_LEFT_MED_CYCLE_2 ) /* 'Best Part Of The Creation / PYM' timing */
1.1.1.11 root 1076: {
1.1.1.15 root 1077: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect med res overscan offset 2 bytes\n" );
1078: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_OVERSCAN_MED_RES | ( 2 << 20 );
1.1.1.11 root 1079: }
1080: }
1081:
1.1.1.15 root 1082: /* If left border was opened with a hi/med res switch we need to check */
1083: /* if the switch to low res can trigger a right hardware scrolling. */
1084: /* We store the pixels count in DisplayPixelShift */
1085: if ( ( ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask & BORDERMASK_LEFT_OFF_MED )
1086: && ( Res == 0x00 ) && ( LineCycles <= LINE_SCROLL_1_CYCLE_50 ) )
1.1.1.11 root 1087: {
1.1.1.15 root 1088: /* The hi/med switch was a switch to do low res hardware scrolling, */
1089: /* so we must cancel the med res overscan bit. */
1090: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask &= (~BORDERMASK_OVERSCAN_MED_RES);
1.1.1.11 root 1091:
1.1.1.15 root 1092: if ( LineCycles == LINE_SCROLL_13_CYCLE_50 ) /* cycle 20 */
1.1.1.11 root 1093: {
1.1.1.15 root 1094: LOG_TRACE(TRACE_VIDEO_BORDER_H , "detect 13 pixels right scroll\n" );
1095: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayPixelShift = 13;
1.1.1.11 root 1096: }
1.1.1.15 root 1097: else if ( LineCycles == LINE_SCROLL_9_CYCLE_50 ) /* cycle 24 */
1.1.1.11 root 1098: {
1.1.1.15 root 1099: LOG_TRACE(TRACE_VIDEO_BORDER_H , "detect 9 pixels right scroll\n" );
1100: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayPixelShift = 9;
1.1.1.11 root 1101: }
1.1.1.15 root 1102: else if ( LineCycles == LINE_SCROLL_5_CYCLE_50 ) /* cycle 28 */
1.1.1.11 root 1103: {
1.1.1.15 root 1104: LOG_TRACE(TRACE_VIDEO_BORDER_H , "detect 5 pixels right scroll\n" );
1105: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayPixelShift = 5;
1.1.1.11 root 1106: }
1.1.1.15 root 1107: else if ( LineCycles == LINE_SCROLL_1_CYCLE_50 ) /* cycle 32 */
1.1.1.11 root 1108: {
1.1.1.15 root 1109: LOG_TRACE(TRACE_VIDEO_BORDER_H , "detect 1 pixel right scroll\n" );
1110: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayPixelShift = 1;
1.1.1.11 root 1111: }
1112: }
1113:
1.1.1.18! root 1114: #define SCROLL2_4PX
! 1115: #ifdef SCROLL2_4PX
! 1116: /* Left border was removed with a hi/lo switch, then a med res switch was made */
! 1117: /* Depending on the low res switch, the screen will be shifted as a low res overscan line */
! 1118: /* This is a different method than the one used by ST Connexion with only 3 res switches */
! 1119: /* (so we must cancel the med res overscan bit) */
! 1120: if ( ( ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask & BORDERMASK_OVERSCAN_MED_RES )
! 1121: && ( ( ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask & ( 0xf << 20 ) ) == 0 )
! 1122: && ( Res == 0x00 ) && ( LineCycles <= 40 ) )
! 1123: {
! 1124: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask &= (~BORDERMASK_OVERSCAN_MED_RES); /* cancel mid res */
! 1125:
! 1126: if ( LineCycles == 28 )
! 1127: {
! 1128: LOG_TRACE(TRACE_VIDEO_BORDER_H , "detect 13 pixels right scroll 2\n" );
! 1129: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayPixelShift = 13;
! 1130: }
! 1131: else if ( LineCycles == 32 )
! 1132: {
! 1133: LOG_TRACE(TRACE_VIDEO_BORDER_H , "detect 9 pixels right scroll 2\n" );
! 1134: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayPixelShift = 9;
! 1135: }
! 1136: else if ( LineCycles == 36 )
! 1137: {
! 1138: LOG_TRACE(TRACE_VIDEO_BORDER_H , "detect 5 pixels right scroll 2\n" );
! 1139: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayPixelShift = 5;
! 1140: }
! 1141: else if ( LineCycles == 40 )
! 1142: {
! 1143: LOG_TRACE(TRACE_VIDEO_BORDER_H , "detect 1 pixel right scroll 2\n" );
! 1144: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayPixelShift = 1;
! 1145: }
! 1146: }
! 1147: #endif
! 1148:
1.1.1.15 root 1149:
1150: /* Update HBL's position only if display has not reached pos LINE_START_CYCLE_50 */
1151: /* and HBL interrupt was already handled at the beginning of this line. */
1152: /* This also changes the number of cycles per line. */
1153: if ( ( LineCycles <= LINE_START_CYCLE_50 ) && ( HblCounterVideo == nHBL ) )
1154: {
1155: nCyclesPerLine = Video_HBL_GetPos();
1156: Video_AddInterruptHBL ( nCyclesPerLine );
1157: }
1158:
1159:
1160: /* Update Timer B's position */
1161: LineTimerBCycle = Video_TimerB_GetPos ( HblCounterVideo );
1162: Video_AddInterruptTimerB ( LineTimerBCycle );
1163:
1164:
1165: ShifterFrame.Res = Res;
1166: if ( Res == 0x02 ) /* high res */
1167: {
1168: ShifterFrame.ResPosHi.VBL = nVBLs;
1169: ShifterFrame.ResPosHi.FrameCycles = FrameCycles;
1170: ShifterFrame.ResPosHi.HBL = HblCounterVideo;
1171: ShifterFrame.ResPosHi.LineCycles = LineCycles;
1172: }
1173: else if ( Res == 0x01 ) /* med res */
1174: {
1175: ShifterFrame.ResPosMed.VBL = nVBLs;
1176: ShifterFrame.ResPosMed.FrameCycles = FrameCycles;
1177: ShifterFrame.ResPosMed.HBL = HblCounterVideo;
1178: ShifterFrame.ResPosMed.LineCycles = LineCycles;
1179: }
1180: else /* low res */
1181: {
1182: ShifterFrame.ResPosLo.VBL = nVBLs;
1183: ShifterFrame.ResPosLo.FrameCycles = FrameCycles;
1184: ShifterFrame.ResPosLo.HBL = HblCounterVideo;
1185: ShifterFrame.ResPosLo.LineCycles = LineCycles;
1186: }
1187: }
1188:
1189:
1190:
1191: /*-----------------------------------------------------------------------*/
1192: /**
1193: * Set some default values for DisplayStartCycle/DisplayEndCycle
1194: * when changing frequency in lo/med res (testing orders are important
1195: * because the line can already have some borders changed).
1196: * This is necessary as some freq changes can modify start/end
1197: * even if they're not made at the exact borders' positions.
1198: * These values will be modified later if some borders are changed.
1199: */
1200: static void Video_Sync_SetDefaultStartEnd ( Uint8 Freq , int HblCounterVideo , int LineCycles )
1201: {
1202: if ( Freq == 0x02 ) /* switch to 50 Hz */
1203: {
1204: if ( ( LineCycles <= ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle ) /* start could be 0,52,56 */
1205: && ( ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle == LINE_START_CYCLE_60 ) )
1206: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle = LINE_START_CYCLE_50;
1207:
1208: if ( ( LineCycles <= ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle ) /* end could be 160,372,376,460 */
1209: && ( ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle < LINE_END_CYCLE_50 ) )
1210: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle = LINE_END_CYCLE_50;
1211: }
1212:
1213: else /* switch to 60 Hz */
1214: {
1215: if ( LineCycles < ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle ) /* start could be 0,52,56 */
1216: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle = LINE_START_CYCLE_60;
1217:
1218: if ( ( LineCycles < ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle ) /* end could be 160,372,376,460 */
1219: && ( ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle <= LINE_END_CYCLE_50 ) )
1220: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle = LINE_END_CYCLE_60;
1221: }
1222:
1223: //fprintf ( stderr , "sync default pos %d %d\n", ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
1.1.1.11 root 1224: }
1225:
1226:
1227: /*-----------------------------------------------------------------------*/
1228: /**
1229: * Write to VideoSync (0xff820a), Hz setting
1230: */
1.1.1.15 root 1231: void Video_Sync_WriteByte ( void )
1.1 root 1232: {
1.1.1.15 root 1233: int FrameCycles, HblCounterVideo, LineCycles;
1234: Uint8 Freq;
1.1.1.11 root 1235:
1236:
1.1.1.15 root 1237: if ( bUseVDIRes )
1238: return; /* no 50/60 Hz freq in VDI mode */
1.1.1.11 root 1239:
1240:
1.1.1.15 root 1241: /* We're only interested in bit 1 (50/60Hz) */
1242: Freq = IoMem[0xff820a] & 2;
1.1.1.11 root 1243:
1.1.1.15 root 1244: Video_GetPosition_OnWriteAccess ( &FrameCycles , &HblCounterVideo , &LineCycles );
1245:
1246: 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",
1247: Freq, FrameCycles, LineCycles, nHBL, HblCounterVideo, M68000_GetPC(), CurrentInstrCycles );
1.1.1.11 root 1248:
1.1.1.13 root 1249: /* Ignore consecutive writes of the same value */
1.1.1.15 root 1250: if ( Freq == ShifterFrame.Freq )
1.1.1.13 root 1251: return; /* do nothing */
1252:
1.1.1.15 root 1253: /* Ignore freq changes if we are in high res */
1254: /* 2009/04/26 : don't ignore for now (see ST Cnx in Punish Your Machine) */
1255: // if ( ShifterFrame.Res == 0x02 )
1256: // return; /* do nothing */
1257:
1258: /* Set some default values for DisplayStartCycle/DisplayEndCycle before checking for border removal */
1259: Video_Sync_SetDefaultStartEnd ( Freq , HblCounterVideo , LineCycles );
1260:
1261:
1262: if ( ( ShifterFrame.Freq == 0x00 ) && ( Freq == 0x02 ) /* switched from 60 Hz to 50 Hz ? */
1263: // && ( ShifterFrame.FreqPos60.VBL == nVBLs ) /* switched during the same VBL */
1264: && ( HblCounterVideo >= nStartHBL ) /* only if display is on */
1.1.1.18! root 1265: && ( HblCounterVideo < nEndHBL + BlankLines ) ) /* only if display is on */
1.1.1.15 root 1266: {
1.1.1.18! root 1267: /* Blank line switching freq on STF : switch to 60 Hz on cycle 28, then go back to 50 Hz on cycle 36 */
! 1268: /* This creates a blank line where no signal is displayed, but the video counter will still change for this line */
! 1269: /* This blank line can be combined with left/right border changes */
! 1270: if ( ( FrameCycles - ShifterFrame.FreqPos60.FrameCycles <= 16 )
! 1271: && ( ShifterFrame.FreqPos60.LineCycles == LINE_EMPTY_CYCLE_71_STF )
! 1272: && ( ConfigureParams.System.nMachineType == MACHINE_ST ) )
! 1273: {
! 1274: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_BLANK_LINE;
! 1275: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect blank line freq\n" );
! 1276: }
! 1277:
1.1.1.15 root 1278: /* Add 2 bytes to left border : switch to 60 Hz before LINE_START_CYCLE_60 to force an early start */
1279: /* of the DE signal, then go back to 50 Hz. Note that depending on where the 50 Hz switch is made */
1280: /* the HBL signal will be at position 508 (60 Hz line) or 512 (50 Hz line) */
1281: /* Obtaining a +2 line with 512 cycles requires a 2 cycles precision and is "wake up" state dependant */
1282: if ( ( ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle == LINE_START_CYCLE_60 )
1283: && ( LineCycles >= LINE_START_CYCLE_50 ) /* The line started in 60 Hz and continues in 50 Hz */
1284: && ( LineCycles <= ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle ) ) /* change when line is active */
1.1.1.11 root 1285: {
1.1.1.15 root 1286: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_LEFT_PLUS_2;
1287: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle = LINE_END_CYCLE_50;
1288: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect left+2 %d<->%d\n" ,
1289: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
1.1.1.11 root 1290: }
1291:
1.1.1.15 root 1292: /* Empty line switching freq : start the line in 50 Hz, change to 60 Hz at the exact place */
1293: /* where display is enabled in 50 Hz, then go back to 50 Hz. */
1294: /* Due to 4 cycles precision instead of 2, we must accept a 60 Hz switch at pos 56 or 56+4 */
1295: else if ( ( FrameCycles - ShifterFrame.FreqPos60.FrameCycles <= 24 )
1296: && ( ( ShifterFrame.FreqPos60.LineCycles == LINE_START_CYCLE_50 ) || ( ShifterFrame.FreqPos60.LineCycles == LINE_START_CYCLE_50+4 ) )
1297: && ( LineCycles > LINE_START_CYCLE_50 ) )
1298: {
1299: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_EMPTY_LINE;
1300: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle = 0;
1301: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle = 0;
1302: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect empty line freq %d<->%d\n" ,
1303: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
1.1.1.11 root 1304: }
1.1.1.15 root 1305:
1306: /* Remove 2 bytes to the right : start the line in 50 Hz (pos 0 or 56), change to 60 Hz before the position */
1307: /* where display is disabled in 60 Hz, then go back to 50 Hz */
1308: if ( ( LineCycles > LINE_END_CYCLE_60 ) /* back to 50 Hz after end of 60 Hz line */
1309: && ( ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle != LINE_START_CYCLE_60 ) /* start could be 0 or 56 */
1310: && ( ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle == LINE_END_CYCLE_60 ) )
1311: {
1312: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_RIGHT_MINUS_2;
1313: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect right-2 %d<->%d\n" ,
1314: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
1315: }
1316:
1.1.1.11 root 1317: }
1318:
1.1.1.15 root 1319:
1320: if ( ( ShifterFrame.Freq == 0x02 && Freq == 0x00 ) /* switched from 50 Hz to 60 Hz ? */
1321: && ( HblCounterVideo >= nStartHBL ) /* only if display is on */
1.1.1.18! root 1322: && ( HblCounterVideo < nEndHBL + BlankLines ) ) /* only if display is on */
1.1.1.15 root 1323: {
1324: /* remove right border, display 44 bytes more : switch to 60 Hz at the position where */
1325: /* the line ends in 50 Hz. Some programs don't switch back to 50 Hz immediatly */
1326: /* (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 */
1327: if ( ( LineCycles == LINE_END_CYCLE_50 )
1328: && ( ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle == LINE_END_CYCLE_50 ) )
1329: {
1330: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_RIGHT_OFF;
1.1.1.16 root 1331: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle = LINE_END_CYCLE_NO_RIGHT;
1.1.1.15 root 1332: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect remove right %d<->%d\n" ,
1333: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
1.1.1.11 root 1334: }
1335: }
1336:
1337:
1338: /* Store cycle position of freq 50/60 to check for top/bottom border removal in Video_EndHBL. */
1.1.1.15 root 1339: if ( Freq == 0x02 ) /* switch to 50 Hz */
1.1.1.11 root 1340: {
1.1.1.13 root 1341: if ( ( HblCounterVideo < VIDEO_START_HBL_50HZ ) /* nStartHBL can change only if display is not ON yet */
1342: && ( OverscanMode & OVERSCANMODE_TOP ) == 0 ) /* update only if top was not removed */
1343: nStartHBL = VIDEO_START_HBL_50HZ;
1.1.1.11 root 1344:
1.1.1.13 root 1345: if ( ( HblCounterVideo < VIDEO_END_HBL_50HZ ) /* nEndHBL can change only if display is not OFF yet */
1.1.1.11 root 1346: && ( OverscanMode & OVERSCANMODE_BOTTOM ) == 0 ) /* update only if bottom was not removed */
1.1.1.13 root 1347: nEndHBL = VIDEO_END_HBL_50HZ; /* 263 */
1.1.1.11 root 1348: }
1.1.1.15 root 1349: else if ( Freq == 0x00 ) /* switch to 60 Hz */
1.1.1.11 root 1350: {
1.1.1.13 root 1351: if ( ( HblCounterVideo < VIDEO_START_HBL_60HZ-1 ) /* nStartHBL can change only if display is not ON yet */
1.1.1.15 root 1352: || ( ( HblCounterVideo == VIDEO_START_HBL_60HZ-1 ) && ( LineCycles <= LineRemoveTopCycle ) ) )
1.1.1.13 root 1353: nStartHBL = VIDEO_START_HBL_60HZ;
1.1.1.11 root 1354:
1.1.1.13 root 1355: if ( ( HblCounterVideo < VIDEO_END_HBL_60HZ ) /* nEndHBL can change only if display is not OFF yet */
1.1.1.11 root 1356: && ( OverscanMode & OVERSCANMODE_BOTTOM ) == 0 ) /* update only if bottom was not removed */
1.1.1.13 root 1357: nEndHBL = VIDEO_END_HBL_60HZ; /* 234 */
1358: }
1359:
1.1.1.15 root 1360:
1.1.1.13 root 1361: /* If the frequence changed, we need to update the EndLine interrupt */
1.1.1.15 root 1362: /* so that it happens 28 cycles after the current DisplayEndCycle.*/
1.1.1.13 root 1363: /* We check if the change affects the current line or the next one. */
1.1.1.15 root 1364: /* We also need to check if the HBL interrupt and nCyclesPerLine need */
1365: /* to be updated first. */
1366: if ( Freq != ShifterFrame.Freq )
1367: {
1368: /* Update HBL's position only if display has not reached pos LINE_START_CYCLE_50 */
1369: /* and HBL interrupt was already handled at the beginning of this line. */
1370: /* This also changes the number of cycles per line. */
1371: if ( ( LineCycles <= LINE_START_CYCLE_50 ) && ( HblCounterVideo == nHBL ) )
1372: {
1373: nCyclesPerLine = Video_HBL_GetPos();
1374: Video_AddInterruptHBL ( nCyclesPerLine );
1375: }
1376:
1377: /* Update Timer B's position */
1378: LineTimerBCycle = Video_TimerB_GetPos ( HblCounterVideo );
1379: Video_AddInterruptTimerB ( LineTimerBCycle );
1380: }
1381:
1382:
1383: ShifterFrame.Freq = Freq;
1384: if ( Freq == 0x02 ) /* 50 Hz */
1385: {
1386: ShifterFrame.FreqPos50.VBL = nVBLs;
1387: ShifterFrame.FreqPos50.FrameCycles = FrameCycles;
1388: ShifterFrame.FreqPos50.HBL = HblCounterVideo;
1389: ShifterFrame.FreqPos50.LineCycles = LineCycles;
1390: }
1391: else
1392: {
1393: ShifterFrame.FreqPos60.VBL = nVBLs;
1394: ShifterFrame.FreqPos60.FrameCycles = FrameCycles;
1395: ShifterFrame.FreqPos60.HBL = HblCounterVideo;
1396: ShifterFrame.FreqPos60.LineCycles = LineCycles;
1397: }
1398: }
1399:
1400:
1401: /*-----------------------------------------------------------------------*/
1402: /**
1403: * Compute the cycle position where the HBL should happen on each line.
1404: * In low/med res, the position depends on the video frequency (50/60 Hz)
1405: * In high res, the position is always the same.
1406: * This position also gives the number of CPU cycles per video line.
1407: */
1408: static int Video_HBL_GetPos ( void )
1409: {
1410: int Pos;
1411:
1412: if ( ( IoMem_ReadByte ( 0xff8260 ) & 3 ) == 2 ) /* hi res */
1413: Pos = CYCLES_PER_LINE_71HZ;
1414:
1415: else /* low res or med res */
1416: {
1417: if ( IoMem_ReadByte ( 0xff820a ) & 2 ) /* 50 Hz, pos 512 */
1418: Pos = CYCLES_PER_LINE_50HZ;
1419: else /* 60 Hz, pos 508 */
1420: Pos = CYCLES_PER_LINE_60HZ;
1421: }
1422:
1423: return Pos;
1424: }
1425:
1426:
1427: /*-----------------------------------------------------------------------*/
1428: /**
1429: * Compute the cycle position where the timer B should happen on each
1430: * visible line.
1431: * We compute Timer B position for the given LineNumber, using start/end
1432: * display cycles from ShifterLines[ LineNumber ].
1433: * The position depends on the start of line / end of line positions
1434: * (which depend on the current frequency / border tricks) and
1435: * on the value of the bit 3 in the MFP's AER.
1436: * If bit is 0, timer B will count end of line events (usual case),
1437: * but if bit is 1, timer B will count start of line events (eg Seven Gates Of Jambala)
1438: */
1439: int Video_TimerB_GetPos ( int LineNumber )
1440: {
1441: int Pos;
1442:
1443: if ( ( IoMem[0xfffa03] & ( 1 << 3 ) ) == 0 ) /* we're counting end of line events */
1444: {
1445: Pos = ShifterFrame.ShifterLines[ LineNumber ].DisplayEndCycle + TIMERB_VIDEO_CYCLE_OFFSET;
1446: }
1447: else /* we're counting start of line events */
1448: {
1449: Pos = ShifterFrame.ShifterLines[ LineNumber ].DisplayStartCycle + TIMERB_VIDEO_CYCLE_OFFSET;
1450: }
1451:
1.1.1.18! root 1452: //fprintf ( stderr , "timerb pos=%d\n" , Pos );
! 1453: return Pos;
! 1454: }
! 1455:
! 1456:
! 1457: /*-----------------------------------------------------------------------*/
! 1458: /**
! 1459: * Compute the default cycle position where the timer B should happen
! 1460: * on the next line, when restarting the INTERRUPT_VIDEO_ENDLINE handler.
! 1461: * In low/med res, the position depends on the video frequency (50/60 Hz)
! 1462: * In high res, the position is always the same.
! 1463: */
! 1464: int Video_TimerB_GetDefaultPos ( void )
! 1465: {
! 1466: int Pos;
! 1467:
! 1468: if ( ( IoMem[0xfffa03] & ( 1 << 3 ) ) == 0 ) /* we're counting end of line events */
! 1469: {
! 1470: if ( ( IoMem_ReadByte ( 0xff8260 ) & 3 ) == 2 ) /* hi res */
! 1471: Pos = LINE_END_CYCLE_71;
! 1472:
! 1473: else /* low res or med res */
! 1474: {
! 1475: if ( IoMem_ReadByte ( 0xff820a ) & 2 ) /* 50 Hz, pos 376 */
! 1476: Pos = LINE_END_CYCLE_50;
! 1477: else /* 60 Hz, pos 372 */
! 1478: Pos = LINE_END_CYCLE_60;
! 1479: }
! 1480: }
! 1481: else /* we're counting start of line events */
! 1482: {
! 1483: if ( ( IoMem_ReadByte ( 0xff8260 ) & 3 ) == 2 ) /* hi res */
! 1484: Pos = LINE_START_CYCLE_71;
! 1485:
! 1486: else /* low res or med res */
! 1487: {
! 1488: if ( IoMem_ReadByte ( 0xff820a ) & 2 ) /* 50 Hz, pos 56 */
! 1489: Pos = LINE_START_CYCLE_50;
! 1490: else /* 60 Hz, pos 52 */
! 1491: Pos = LINE_START_CYCLE_60;
! 1492: }
! 1493: }
! 1494:
! 1495: Pos += TIMERB_VIDEO_CYCLE_OFFSET;
! 1496:
! 1497: //fprintf ( stderr , "timerb default pos=%d\n" , Pos );
1.1.1.15 root 1498: return Pos;
1499: }
1500:
1501:
1502: /*-----------------------------------------------------------------------*/
1503: /**
1504: * HBL interrupt : this occurs at the end of every line, on cycle 512 (in 50 Hz)
1505: * It takes 56 cycles to handle the 68000's exception.
1506: */
1507: void Video_InterruptHandler_HBL ( void )
1508: {
1509: int FrameCycles = Cycles_GetCounter(CYCLES_COUNTER_VIDEO);
1510: int PendingCyclesOver;
1511: int NewHBLPos;
1512:
1513: /* How many cycle was this HBL delayed (>= 0) */
1514: PendingCyclesOver = -INT_CONVERT_FROM_INTERNAL ( PendingInterruptCount , INT_CPU_CYCLE );
1515:
1516: /* Remove this interrupt from list and re-order */
1.1.1.16 root 1517: CycInt_AcknowledgeInterrupt();
1.1.1.15 root 1518:
1.1.1.17 root 1519: /* Videl Vertical counter increment (To be removed when Videl emulation is finished) */
1520: /* VFC is incremented every half line, here, we increment it every line (should be completed) */
1521: if (ConfigureParams.System.nMachineType == MACHINE_FALCON) {
1522: vfc_counter += 1;
1523: }
1524:
1525:
1.1.1.15 root 1526: /* Increment the hbl jitter index */
1527: HblJitterIndex++;
1528: if ( HblJitterIndex == HBL_JITTER_MAX_POS )
1529: HblJitterIndex = 0;
1530:
1531: LOG_TRACE ( TRACE_VIDEO_HBL , "HBL %d video_cyc=%d pending_cyc=%d jitter=%d\n" ,
1532: nHBL , FrameCycles , PendingCyclesOver , HblJitterArray[ HblJitterIndex ] );
1533:
1534: /* Default cycle position for next HBL */
1535: NewHBLPos = Video_HBL_GetPos();
1536:
1537: /* Generate new HBL, if need to - there are 313 HBLs per frame in 50 Hz */
1538: if (nHBL < nScanlinesPerFrame-1)
1539: Video_AddInterruptHBL ( NewHBLPos );
1540:
1541:
1542: /* We must handle a very special case : if we had a pending HBL that becomes active */
1543: /* because SR is now <= $2100, then we must process an exception for this pending HBL. */
1544: /* But if a "real" (non pending) HBL occurs during the first 56 cycles needed by the */
1545: /* CPU to prepare the exception, we must ignore this HBL signal (instead of considering */
1546: /* this new HBL should be put in pending state to be processed later) */
1547: /* -> any HBL occuring between LastCycleHblException and LastCycleHblException+56 should be ignored */
1548: if ( ( LastCycleHblException != -1 )
1.1.1.17 root 1549: && ( ( FrameCycles - PendingCyclesOver - HblJitterArray[ HblJitterIndex ] ) - LastCycleHblException <= 56 )
1550: && ( ( M68000_GetPC() < 0x8280 ) || ( M68000_GetPC() > 0x82b0 ) ) ) /* FIXME : except for European Demos intro where 8280<pc<82b0 */
1.1.1.15 root 1551: {
1552: /* simultaneous case, don't call M68000_Exception */
1553: LOG_TRACE ( TRACE_VIDEO_HBL , "HBL %d video_cyc=%d signal ignored during pending hbl exception at cycle %d\n" ,
1554: nHBL , Cycles_GetCounter(CYCLES_COUNTER_VIDEO) , LastCycleHblException );
1555: LastCycleHblException = -1;
1556: }
1557: else
1558: {
1559: /* "normal" case, this HBL doesn't occur during the processing of a pending HBL */
1.1.1.16 root 1560: M68000_Exception(EXCEPTION_HBLANK , M68000_EXC_SRC_AUTOVEC); /* Horizontal blank interrupt, level 2! */
1.1.1.15 root 1561: }
1562:
1563:
1564: Video_EndHBL(); /* Check some borders removal and copy line to display buffer */
1565:
1.1.1.17 root 1566: DmaSnd_STE_HBL_Update(); /* Update STE DMA sound if needed */
1567:
1.1.1.15 root 1568: nHBL++; /* Increase HBL count */
1569:
1570: if (nHBL < nScanlinesPerFrame)
1571: {
1572: /* Update start cycle for next HBL */
1573: ShifterFrame.ShifterLines[ nHBL ].StartCycle = FrameCycles - PendingCyclesOver;
1574: LOG_TRACE(TRACE_VIDEO_HBL, "HBL %d start=%d %x\n", nHBL,
1575: ShifterFrame.ShifterLines[nHBL].StartCycle, ShifterFrame.ShifterLines[nHBL].StartCycle);
1576:
1577: /* Setup next HBL */
1578: Video_StartHBL();
1579: }
1580: }
1581:
1582:
1583: /*-----------------------------------------------------------------------*/
1584: /**
1585: * Check at end of each HBL to see if any Shifter hardware tricks have been attempted
1586: * and copy the line to the screen buffer.
1587: * This is the place to check if top/bottom border were removed, as well as if some
1588: * left/right border changes were not validated before.
1589: * NOTE : the tests must be made with nHBL in ascending order.
1590: */
1591: static void Video_EndHBL(void)
1592: {
1593: //
1594: // Handle top/bottom borders removal when switching freq
1595: //
1596:
1597: /* Remove top border if the switch to 60 Hz was made during this vbl before cycle */
1598: /* LineRemoveTopCycle on line 33 and if the switch to 50 Hz has not yet occured or */
1599: /* occured before the 60 Hz or occured after cycle LineRemoveTopCycle on line 33. */
1600: if ( ( nHBL == VIDEO_START_HBL_60HZ-1 ) /* last HBL before first line of a 60 Hz screen */
1601: && ( ShifterFrame.FreqPos60.VBL == nVBLs ) /* switch to 60 Hz during this VBL */
1602: && ( ( ShifterFrame.FreqPos60.HBL < nHBL ) || ( ShifterFrame.FreqPos60.LineCycles <= LineRemoveTopCycle ) )
1603: && ( ( ShifterFrame.FreqPos50.VBL < nVBLs )
1604: || ( ShifterFrame.FreqPos50.FrameCycles < ShifterFrame.FreqPos60.FrameCycles )
1605: || ( ShifterFrame.FreqPos50.HBL > nHBL )
1606: || ( ( ShifterFrame.FreqPos50.HBL == nHBL ) && ( ShifterFrame.FreqPos50.LineCycles > LineRemoveTopCycle ) ) ) )
1607: {
1608: /* Top border */
1609: LOG_TRACE ( TRACE_VIDEO_BORDER_V , "detect remove top\n" );
1610: OverscanMode |= OVERSCANMODE_TOP; /* Set overscan bit */
1611: nStartHBL = VIDEO_START_HBL_60HZ; /* New start screen line */
1612: pHBLPaletteMasks -= OVERSCAN_TOP; // FIXME useless ?
1613: pHBLPalettes -= OVERSCAN_TOP; // FIXME useless ?
1614: }
1615:
1616: /* Remove bottom border for a 60 Hz screen (tests are similar to the ones for top border) */
1.1.1.18! root 1617: else if ( ( nHBL == VIDEO_END_HBL_60HZ + BlankLines - 1 ) /* last displayed line in 60 Hz */
1.1.1.15 root 1618: && ( nStartHBL == VIDEO_START_HBL_60HZ ) /* screen started in 60 Hz */
1619: && ( ( OverscanMode & OVERSCANMODE_TOP ) == 0 ) /* and top border was not removed : this screen is only 60 Hz */
1620: && ( ShifterFrame.FreqPos50.VBL == nVBLs ) /* switch to 50 Hz during this VBL */
1621: && ( ( ShifterFrame.FreqPos50.HBL < nHBL ) || ( ShifterFrame.FreqPos50.LineCycles <= LineRemoveBottomCycle ) )
1622: && ( ( ShifterFrame.FreqPos60.VBL < nVBLs )
1623: || ( ShifterFrame.FreqPos60.FrameCycles < ShifterFrame.FreqPos50.FrameCycles )
1624: || ( ShifterFrame.FreqPos60.HBL > nHBL )
1625: || ( ( ShifterFrame.FreqPos60.HBL == nHBL ) && ( ShifterFrame.FreqPos60.LineCycles > LineRemoveBottomCycle ) ) ) )
1626: {
1627: LOG_TRACE ( TRACE_VIDEO_BORDER_V , "detect remove bottom 60Hz\n" );
1628: OverscanMode |= OVERSCANMODE_BOTTOM;
1629: nEndHBL = SCANLINES_PER_FRAME_60HZ; /* new end for a 60 Hz screen */
1630: }
1631:
1632: /* Remove bottom border for a 50 Hz screen (tests are similar to the ones for top border) */
1.1.1.18! root 1633: else if ( ( nHBL == VIDEO_END_HBL_50HZ + BlankLines - 1 ) /* last displayed line in 50 Hz */
1.1.1.15 root 1634: && ( ( OverscanMode & OVERSCANMODE_BOTTOM ) == 0 ) /* border was not already removed at line VIDEO_END_HBL_60HZ-1 */
1635: && ( ShifterFrame.FreqPos60.VBL == nVBLs ) /* switch to 60 Hz during this VBL */
1636: && ( ( ShifterFrame.FreqPos60.HBL < nHBL ) || ( ShifterFrame.FreqPos60.LineCycles <= LineRemoveBottomCycle ) )
1637: && ( ( ShifterFrame.FreqPos50.VBL < nVBLs )
1638: || ( ShifterFrame.FreqPos50.FrameCycles < ShifterFrame.FreqPos60.FrameCycles )
1639: || ( ShifterFrame.FreqPos50.HBL > nHBL )
1640: || ( ( ShifterFrame.FreqPos50.HBL == nHBL ) && ( ShifterFrame.FreqPos50.LineCycles > LineRemoveBottomCycle ) ) ) )
1.1.1.13 root 1641: {
1.1.1.15 root 1642: LOG_TRACE ( TRACE_VIDEO_BORDER_V , "detect remove bottom\n" );
1643: OverscanMode |= OVERSCANMODE_BOTTOM;
1644: nEndHBL = VIDEO_END_HBL_50HZ+VIDEO_HEIGHT_BOTTOM_50HZ; /* new end for a 50 Hz screen */
1645: }
1646:
1647:
1648: //
1649: // Check some left/right borders effects that were not detected earlier
1650: // (this is usually due to staying in 60 Hz for too long, which is often a bad
1651: // coding practice as it can distort the display on a real ST)
1652: //
1653:
1654: /* Special case when the line was not started in 60 Hz, then switched to 60 Hz */
1655: /* and was not restored to 50 Hz before the end of the line. In that case, the */
1656: /* line ends 2 bytes earlier on the right (line can start at LINE_START_CYCLE_71/50) */
1657: /* Some programs also turn to 60 Hz too early during the active display of the last */
1658: /* line to remove the bottom border (FNIL by TNT), in that case, we should also remove */
1659: /* 2 bytes to this line */
1660: if ( ( ( ShifterFrame.ShifterLines[ nHBL ].BorderMask & BORDERMASK_RIGHT_MINUS_2 ) == 0 )
1661: && ( ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle != LINE_START_CYCLE_60 ) /* start could be 0 or 56 */
1662: && ( ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle == LINE_END_CYCLE_60 ) )
1663: {
1664: ShifterFrame.ShifterLines[ nHBL ].BorderMask |= BORDERMASK_RIGHT_MINUS_2;
1665: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect late right-2 %d<->%d\n" ,
1666: ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle , ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle );
1667: }
1668:
1669:
1670: /* Similar case when line started in 60 Hz but did not end at the usual LINE_END_CYCLE_60 position */
1671: /* (line can end at LINE_END_CYCLE_71/50 or have right border removed) */
1672: /* This means left border had 2 bytes more to display */
1673: if ( ( ( ShifterFrame.ShifterLines[ nHBL ].BorderMask & BORDERMASK_LEFT_PLUS_2 ) == 0 )
1674: && ( ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle == LINE_START_CYCLE_60 )
1675: && ( ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle != LINE_END_CYCLE_60 ) ) /* end could be 160, 372 or 460 */
1676: {
1677: ShifterFrame.ShifterLines[ nHBL ].BorderMask |= BORDERMASK_LEFT_PLUS_2;
1678: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect late left+2 %d<->%d\n" ,
1679: ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle , ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle );
1680: }
1681:
1682:
1683: /* Although a 'left+2' was detected earlier, the freq was switched back to 60 Hz during DE, so the line is just */
1684: /* a normal 60 Hz line ; we must cancel the 'left+2' flag */
1685: else if ( ( ShifterFrame.ShifterLines[ nHBL ].BorderMask & BORDERMASK_LEFT_PLUS_2 )
1686: && ( ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle == LINE_END_CYCLE_60 ) )
1687: {
1688: ShifterFrame.ShifterLines[ nHBL ].BorderMask &= ~BORDERMASK_LEFT_PLUS_2;
1689: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "cancel late left+2 %d<->%d\n" ,
1690: ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle , ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle );
1691: }
1692:
1693:
1.1.1.13 root 1694:
1.1.1.15 root 1695: /* Store palette for very first line on screen - HBLPalettes[0] */
1696: if (nHBL == nFirstVisibleHbl-1)
1697: {
1698: /* Store ALL palette for this line into raster table for datum */
1699: Video_StoreFirstLinePalette();
1700: }
1701:
1702: if (bUseHighRes)
1703: {
1704: /* Copy for hi-res (no overscan) */
1705: if (nHBL >= nFirstVisibleHbl && nHBL < nLastVisibleHbl)
1706: Video_CopyScreenLineMono();
1707: }
1708: /* Are we in possible visible color display (including borders)? */
1709: else if (nHBL >= nFirstVisibleHbl && nHBL < nLastVisibleHbl)
1710: {
1711: /* Store resolution for every line so can check for mix low/med screens */
1712: Video_StoreResolution(nHBL-nFirstVisibleHbl);
1713:
1714: /* Copy line of screen to buffer to simulate TV raster trace
1715: * - required for mouse cursor display/game updates
1716: * Eg, Lemmings and The Killing Game Show are good examples */
1717: Video_CopyScreenLineColor();
1718: }
1719: }
1720:
1721:
1722: /*-----------------------------------------------------------------------*/
1723: /**
1724: * Set default values for the next HBL, depending on the current res/freq.
1725: * We set the number of cycles per line, as well as some default values
1726: * for display start/end cycle.
1727: */
1728: static void Video_StartHBL(void)
1729: {
1.1.1.18! root 1730: if (bUseHighRes || (IoMem_ReadByte(0xff8260) & 3) == 2) /* hi res */
1.1.1.15 root 1731: {
1732: nCyclesPerLine = CYCLES_PER_LINE_71HZ;
1733: ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle = LINE_START_CYCLE_71;
1734: ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle = LINE_END_CYCLE_71;
1735: }
1736: else
1737: {
1738: if ( IoMem_ReadByte ( 0xff820a ) & 2 ) /* 50 Hz */
1739: {
1740: nCyclesPerLine = CYCLES_PER_LINE_50HZ;
1741: if ( ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle == -1 ) /* start not set yet */
1742: ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle = LINE_START_CYCLE_50;
1743: ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle = LINE_END_CYCLE_50;
1744: }
1745: else /* 60 Hz */
1746: {
1747: nCyclesPerLine = CYCLES_PER_LINE_60HZ;
1748: if ( ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle == -1 ) /* start not set yet */
1749: ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle = LINE_START_CYCLE_60;
1750: ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle = LINE_END_CYCLE_60;
1751: }
1752: }
1753: }
1754:
1755:
1756: /*-----------------------------------------------------------------------*/
1757: /**
1758: * End Of Line interrupt
1759: * This interrupt is started on cycle position 404 in 50 Hz and on cycle
1760: * position 400 in 60 Hz. 50 Hz display ends at cycle 376 and 60 Hz displays
1761: * ends at cycle 372. This means the EndLine interrupt happens 28 cycles
1762: * after DisplayEndCycle.
1763: * Note that if bit 3 of MFP AER is 1, then timer B will count start of line
1764: * instead of end of line (at cycle 52+28 or 56+28)
1765: */
1766: void Video_InterruptHandler_EndLine(void)
1767: {
1768: int FrameCycles, HblCounterVideo, LineCycles;
1769: int PendingCycles = -INT_CONVERT_FROM_INTERNAL ( PendingInterruptCount , INT_CPU_CYCLE );
1770:
1771: Video_GetPosition ( &FrameCycles , &HblCounterVideo , &LineCycles );
1772:
1773: LOG_TRACE ( TRACE_VIDEO_HBL , "EndLine TB %d video_cyc=%d line_cyc=%d pending_int_cnt=%d\n" ,
1774: nHBL , FrameCycles , LineCycles , PendingCycles );
1775:
1776: /* Remove this interrupt from list and re-order */
1.1.1.16 root 1777: CycInt_AcknowledgeInterrupt();
1.1.1.15 root 1778:
1779: /* Ignore HBLs in VDI mode */
1780: if (bUseVDIRes)
1781: return;
1782:
1783: /* Generate new Endline, if need to - there are 313 HBLs per frame */
1784: if (nHBL < nScanlinesPerFrame-1)
1785: {
1786: /* By default, next EndLine's int will be on line nHBL+1 at pos 376+28 or 372+28 */
1787: if ( ( IoMem[0xfffa03] & ( 1 << 3 ) ) == 0 ) /* count end of line */
1.1.1.13 root 1788: {
1.1.1.15 root 1789: /* If EndLine int is delayed too much (more than 100 cycles), nLineCycles will */
1790: /* be in the range 0..xxx instead of 400..512. In that case, we need to add */
1791: /* nCyclesPerLine to be in the range 512..x+512 */
1792: /* Maximum possible delay should be around 160 cycles on STF (DIVS) */
1793: /* In that case, HBL int will be delayed too, so we will have HblCounterVideo == nHBL+1 */
1794: if ( HblCounterVideo == nHBL+1 ) /* int happened in fact on the next line nHBL+1 */
1795: LineCycles += nCyclesPerLine;
1.1.1.13 root 1796:
1.1.1.18! root 1797: LineTimerBCycle = Video_TimerB_GetDefaultPos ();
1.1.1.13 root 1798: }
1799:
1.1.1.15 root 1800: else /* count start of line, no possible delay to handle */
1.1.1.13 root 1801: {
1.1.1.18! root 1802: LineTimerBCycle = Video_TimerB_GetDefaultPos ();
1.1.1.13 root 1803: }
1804:
1.1.1.15 root 1805: //fprintf ( stderr , "new tb %d %d %d\n" , LineTimerBCycle , nCyclesPerLine , LineTimerBCycle - LineCycles + nCyclesPerLine );
1.1.1.16 root 1806: CycInt_AddRelativeInterrupt ( LineTimerBCycle - LineCycles + nCyclesPerLine,
1.1.1.15 root 1807: INT_CPU_CYCLE, INTERRUPT_VIDEO_ENDLINE );
1.1.1.11 root 1808: }
1809:
1.1.1.15 root 1810: /* Timer B occurs at END of first visible screen line in Event Count mode */
1.1.1.18! root 1811: if ( ( nHBL >= nStartHBL ) && ( nHBL < nEndHBL + BlankLines ) )
1.1.1.11 root 1812: {
1.1.1.15 root 1813: /* Handle Timer B when using Event Count mode */
1814: /* We must ensure that the write to fffa1b to activate timer B was */
1815: /* completed before the point where the end of line signal was generated */
1816: /* (in the case of a move.b #8,$fffa1b that would happen 4 cycles */
1817: /* before end of line, the interrupt should not be generated) */
1818: if ( (MFP_TBCR == 0x08) /* Is timer in Event Count mode ? */
1819: && ( ( TimerBEventCountCycleStart == -1 ) /* timer B was started during a previous VBL */
1820: || ( TimerBEventCountCycleStart < FrameCycles-PendingCycles ) ) ) /* timer B was started before this possible interrupt */
1821: MFP_TimerB_EventCount_Interrupt(); /* we have a valid timer B interrupt */
1.1.1.11 root 1822: }
1.1 root 1823: }
1824:
1.1.1.2 root 1825:
1.1.1.15 root 1826:
1827:
1.1.1.2 root 1828: /*-----------------------------------------------------------------------*/
1.1.1.11 root 1829: /**
1830: * Store whole palette on first line so have reference to work from
1831: */
1.1.1.7 root 1832: static void Video_StoreFirstLinePalette(void)
1.1 root 1833: {
1.1.1.11 root 1834: Uint16 *pp2;
1835: int i;
1836:
1837: pp2 = (Uint16 *)&IoMem[0xff8240];
1838: for (i = 0; i < 16; i++)
1839: HBLPalettes[i] = SDL_SwapBE16(*pp2++);
1.1 root 1840:
1.1.1.11 root 1841: /* And set mask flag with palette and resolution */
1842: // FIXME ; enlever PALETTEMASK_RESOLUTION
1843:
1.1.1.15 root 1844: // if ( ShifterFrame.ShifterLines[ nFirstVisibleHbl ].BorderMask == BORDERMASK_NONE ) // no border trick, store the current res
1.1.1.11 root 1845: HBLPaletteMasks[0] = (PALETTEMASK_RESOLUTION|PALETTEMASK_PALETTE) | (((Uint32)IoMem_ReadByte(0xff8260)&0x3)<<16);
1846: // else // border removal, assume low res for the whole line
1847: // HBLPaletteMasks[0] = (PALETTEMASK_RESOLUTION|PALETTEMASK_PALETTE) | (0<<16);
1.1 root 1848: }
1849:
1.1.1.2 root 1850:
1851: /*-----------------------------------------------------------------------*/
1.1.1.11 root 1852: /**
1853: * Store resolution on each line (used to test if mixed low/medium resolutions)
1854: */
1.1.1.7 root 1855: static void Video_StoreResolution(int y)
1.1 root 1856: {
1.1.1.11 root 1857: Uint8 res;
1858: int Mask;
1.1 root 1859:
1.1.1.11 root 1860: /* Clear resolution, and set with current value */
1861: if (!(bUseHighRes || bUseVDIRes))
1862: {
1863: HBLPaletteMasks[y] &= ~(0x3<<16);
1864: res = IoMem_ReadByte(0xff8260)&0x3;
1865:
1.1.1.15 root 1866: Mask = ShifterFrame.ShifterLines[ y+nFirstVisibleHbl ].BorderMask;
1.1.1.11 root 1867:
1.1.1.15 root 1868: if ( Mask & BORDERMASK_OVERSCAN_MED_RES ) /* special case for med res to render the overscan line */
1869: res = 1; /* med res instead of low res */
1.1.1.11 root 1870: else if ( Mask != BORDERMASK_NONE ) /* border removal : assume low res for the whole line */
1871: res = 0;
1.1.1.2 root 1872:
1.1.1.11 root 1873: HBLPaletteMasks[y] |= PALETTEMASK_RESOLUTION|((Uint32)res)<<16;
1874:
1875: #if 0
1876: if ( ( Mask == BORDERMASK_NONE ) /* no border trick, store the current res */
1877: || ( res == 0 ) || ( res == 1 ) ) /* if border trick, ignore passage to hi res */
1878: HBLPaletteMasks[y] |= PALETTEMASK_RESOLUTION|((Uint32)res)<<16;
1879: else /* border removal or hi res : assume low res for the whole line */
1880: HBLPaletteMasks[y] |= (0)<<16;
1881:
1.1.1.15 root 1882: /* special case for med res to render the overscan line */
1883: if ( Mask & BORDERMASK_OVERSCAN_MED_RES )
1884: HBLPaletteMasks[y] |= PALETTEMASK_RESOLUTION|((Uint32)1)<<16; /* med res instead of low res */
1.1.1.11 root 1885: #endif
1.1 root 1886:
1.1.1.11 root 1887: // fprintf ( stderr , "store res %d line %d %x %x\n" , res , y , Mask , HBLPaletteMasks[y] );
1888: }
1.1.1.9 root 1889: }
1890:
1891:
1892: /*-----------------------------------------------------------------------*/
1.1.1.11 root 1893: /**
1894: * Copy one line of monochrome screen into buffer for conversion later.
1895: */
1896: static void Video_CopyScreenLineMono(void)
1897: {
1898: /* Copy one line - 80 bytes in ST high resolution */
1899: memcpy(pSTScreen, pVideoRaster, SCREENBYTES_MONOLINE);
1900: pVideoRaster += SCREENBYTES_MONOLINE;
1901:
1902: /* Handle STE fine scrolling (HWScrollCount is zero on ST). */
1903: if (HWScrollCount)
1904: {
1905: Uint16 *pScrollAdj;
1906: int nNegScrollCnt;
1907:
1908: pScrollAdj = (Uint16 *)pSTScreen;
1909: nNegScrollCnt = 16 - HWScrollCount;
1910:
1911: /* Shift the whole line by the given scroll count */
1912: while ((Uint8*)pScrollAdj < pSTScreen + SCREENBYTES_MONOLINE-2)
1913: {
1914: do_put_mem_word(pScrollAdj, (do_get_mem_word(pScrollAdj) << HWScrollCount)
1915: | (do_get_mem_word(pScrollAdj+1) >> nNegScrollCnt));
1916: ++pScrollAdj;
1917: }
1918:
1919: /* Handle the last 16 pixels of the line */
1920: do_put_mem_word(pScrollAdj, (do_get_mem_word(pScrollAdj) << HWScrollCount)
1921: | (do_get_mem_word(pVideoRaster) >> nNegScrollCnt));
1922:
1923: /* HW scrolling advances Shifter video counter by one */
1924: pVideoRaster += 1 * 2;
1925: }
1926:
1927: /* LineWidth is zero on ST. */
1928: /* On STE, the Shifter skips the given amount of words. */
1929: pVideoRaster += LineWidth*2;
1930:
1931: /* On STE, handle modifications of the video counter address $ff8205/07/09 */
1932: /* that occurred while the display was already ON */
1.1.1.16 root 1933: if ( VideoCounterDelayedOffset != 0 )
1.1.1.11 root 1934: {
1.1.1.16 root 1935: pVideoRaster += ( VideoCounterDelayedOffset & ~1 );
1936: VideoCounterDelayedOffset = 0;
1.1.1.11 root 1937: }
1.1.1.16 root 1938:
1939: if ( pVideoRasterDelayed != NULL )
1.1.1.11 root 1940: {
1.1.1.16 root 1941: pVideoRaster = pVideoRasterDelayed;
1942: pVideoRasterDelayed = NULL;
1.1.1.11 root 1943: }
1944:
1945: /* On STE, if we wrote to the hwscroll register, we set the */
1946: /* new value here, once the current line was processed */
1947: if ( NewHWScrollCount >= 0 )
1948: {
1949: HWScrollCount = NewHWScrollCount;
1950: NewHWScrollCount = -1;
1951: }
1952:
1953: /* On STE, if we wrote to the linewidth register, we set the */
1954: /* new value here, once the current line was processed */
1955: if ( NewLineWidth >= 0 )
1956: {
1957: LineWidth = NewLineWidth;
1958: NewLineWidth = -1;
1959: }
1960:
1961: /* Each screen line copied to buffer is always same length */
1962: pSTScreen += SCREENBYTES_MONOLINE;
1963: }
1964:
1965:
1966: /*-----------------------------------------------------------------------*/
1967: /**
1968: * Copy one line of color screen into buffer for conversion later.
1969: * Possible lines may be top/bottom border, and/or left/right borders.
1970: */
1.1.1.9 root 1971: static void Video_CopyScreenLineColor(void)
1972: {
1.1.1.15 root 1973: int LineBorderMask;
1.1.1.11 root 1974: int VideoOffset = 0;
1975: int STF_PixelScroll = 0;
1.1.1.14 root 1976: int LineRes;
1.1.1.17 root 1977: Uint8 *pVideoRasterEndLine; /* addr of the last byte copied from pVideoRaster to pSTScreen (for HWScrollCount) */
1978: int i;
1.1.1.14 root 1979:
1.1.1.15 root 1980: LineBorderMask = ShifterFrame.ShifterLines[ nHBL ].BorderMask;
1.1.1.16 root 1981: STF_PixelScroll = ShifterFrame.ShifterLines[ nHBL ].DisplayPixelShift;
1.1.1.15 root 1982:
1983: /* Get resolution for this line (in case of mixed low/med screen) */
1984: LineRes = ( HBLPaletteMasks[nHBL-nFirstVisibleHbl] >> 16 ) & 1; /* 0=low res 1=med res */
1.1.1.11 root 1985:
1.1.1.16 root 1986: //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 1987:
1988: /* If left border is opened, we need to compensate one missing word in low res (1 plan) */
1.1.1.15 root 1989: /* If overscan is in med res, the offset is variable */
1990: if ( LineBorderMask & BORDERMASK_OVERSCAN_MED_RES )
1991: VideoOffset = - ( ( LineBorderMask >> 20 ) & 0x0f ); /* No Cooper=0 PYM=-2 in med res overscan */
1.1.1.11 root 1992:
1993: else if ( LineBorderMask & BORDERMASK_LEFT_OFF )
1.1.1.18! root 1994: {
! 1995: #ifdef SCROLL2_4PX
! 1996: int ShiftPixels = 0;
! 1997:
! 1998: if ( STF_PixelScroll == 13 ) { VideoOffset = 2; ShiftPixels = 8; }
! 1999: else if ( STF_PixelScroll == 9 ) { VideoOffset = 0; ShiftPixels = 8; }
! 2000: else if ( STF_PixelScroll == 5 ) { VideoOffset = -2; ShiftPixels = 8; }
! 2001: else if ( STF_PixelScroll == 1 ) { VideoOffset = -4; ShiftPixels = 8; }
! 2002:
! 2003: else VideoOffset = -2; /* Normal low res left border removal without 4 pixels scrolling */
! 2004:
! 2005: STF_PixelScroll -= ShiftPixels;
! 2006: #else
1.1.1.14 root 2007: VideoOffset = -2; /* always 2 bytes in low res overscan */
1.1.1.18! root 2008: #endif
! 2009: }
1.1.1.11 root 2010:
1.1.1.16 root 2011: else if ( LineBorderMask & BORDERMASK_LEFT_OFF_2_STE )
2012: VideoOffset = -4; /* 4 first bytes of the line are not shown */
2013:
1.1.1.11 root 2014: /* Handle 4 pixels hardware scrolling ('ST Cnx' demo in 'Punish Your Machine') */
2015: /* Depending on the number of pixels, we need to compensate for some skipped words */
1.1.1.15 root 2016: else if ( LineBorderMask & BORDERMASK_LEFT_OFF_MED )
1.1.1.11 root 2017: {
1.1.1.16 root 2018: if ( STF_PixelScroll == 13 ) VideoOffset = 2;
2019: else if ( STF_PixelScroll == 9 ) VideoOffset = 0;
2020: else if ( STF_PixelScroll == 5 ) VideoOffset = -2;
2021: else if ( STF_PixelScroll == 1 ) VideoOffset = -4;
1.1.1.11 root 2022: else VideoOffset = 0; /* never used ? */
2023:
1.1.1.16 root 2024: STF_PixelScroll -= 8; /* removing left border in mid res also shifts display to the left */
1.1.1.11 root 2025: // fprintf(stderr , "scr off %d %d\n" , STF_PixelScroll , VideoOffset);
2026: }
2027:
1.1.1.13 root 2028:
1.1.1.11 root 2029: /* Is total blank line? I.e. top/bottom border? */
1.1.1.18! root 2030: if ((nHBL < nStartHBL) || (nHBL >= nEndHBL + BlankLines)
1.1.1.15 root 2031: || (LineBorderMask & BORDERMASK_EMPTY_LINE))
1.1.1.11 root 2032: {
2033: /* Clear line to color '0' */
2034: memset(pSTScreen, 0, SCREENBYTES_LINE);
2035: }
2036: else
2037: {
1.1.1.18! root 2038: /* Does have left border ? */
1.1.1.16 root 2039: if ( LineBorderMask & ( BORDERMASK_LEFT_OFF | BORDERMASK_LEFT_OFF_MED ) ) /* bigger line by 26 bytes on the left */
1.1.1.11 root 2040: {
2041: pVideoRaster += BORDERBYTES_LEFT-SCREENBYTES_LEFT+VideoOffset;
2042: memcpy(pSTScreen, pVideoRaster, SCREENBYTES_LEFT);
2043: pVideoRaster += SCREENBYTES_LEFT;
2044: }
1.1.1.16 root 2045: else if ( LineBorderMask & BORDERMASK_LEFT_OFF_2_STE ) /* bigger line by 20 bytes on the left (STE specific) */
2046: { /* bytes 0-3 are not shown, only next 16 bytes (32 pixels, 4 bitplanes) */
2047: if ( SCREENBYTES_LEFT > BORDERBYTES_LEFT_2_STE )
2048: {
2049: memset ( pSTScreen, 0, SCREENBYTES_LEFT-BORDERBYTES_LEFT_2_STE+4 ); /* clear unused pixels + bytes 0-3 */
2050: memcpy ( pSTScreen+SCREENBYTES_LEFT-BORDERBYTES_LEFT_2_STE+4, pVideoRaster+VideoOffset+4, BORDERBYTES_LEFT_2_STE-4 );
2051: }
2052: else
2053: memcpy ( pSTScreen, pVideoRaster+BORDERBYTES_LEFT_2_STE-SCREENBYTES_LEFT+VideoOffset, SCREENBYTES_LEFT );
2054:
2055: pVideoRaster += BORDERBYTES_LEFT_2_STE+VideoOffset;
2056: }
2057: else if (LineBorderMask & BORDERMASK_LEFT_PLUS_2) /* bigger line by 2 bytes on the left */
1.1.1.11 root 2058: {
1.1.1.16 root 2059: if ( SCREENBYTES_LEFT > 2 )
2060: {
2061: memset(pSTScreen,0,SCREENBYTES_LEFT-2); /* clear unused pixels */
2062: memcpy(pSTScreen+SCREENBYTES_LEFT-2, pVideoRaster, 2);
2063: }
2064: else
2065: { /* nothing to copy, left border is not large enough */
2066: }
2067:
1.1.1.11 root 2068: pVideoRaster += 2;
2069: }
1.1.1.16 root 2070: else if (bSteBorderFlag) /* bigger line by 8 bytes on the left (STE specific) */
1.1.1.12 root 2071: {
1.1.1.16 root 2072: if ( SCREENBYTES_LEFT > 4*2 )
2073: {
2074: memset(pSTScreen,0,SCREENBYTES_LEFT-4*2); /* clear unused pixels */
2075: memcpy(pSTScreen+SCREENBYTES_LEFT-4*2, pVideoRaster, 4*2);
2076: }
2077: else
2078: { /* nothing to copy, left border is not large enough */
2079: }
2080:
1.1.1.12 root 2081: pVideoRaster += 4*2;
2082: }
1.1.1.11 root 2083: else
1.1.1.16 root 2084: memset(pSTScreen,0,SCREENBYTES_LEFT); /* left border not removed, clear to color '0' */
1.1.1.11 root 2085:
2086: /* Short line due to hires in the middle ? */
2087: if (LineBorderMask & BORDERMASK_STOP_MIDDLE)
2088: {
2089: /* 106 bytes less in the line */
2090: memcpy(pSTScreen+SCREENBYTES_LEFT, pVideoRaster, SCREENBYTES_MIDDLE-106);
1.1.1.12 root 2091: memset(pSTScreen+SCREENBYTES_LEFT+SCREENBYTES_MIDDLE-106, 0, 106); /* clear unused pixels */
1.1.1.11 root 2092: pVideoRaster += (SCREENBYTES_MIDDLE-106);
2093: }
2094: else
2095: {
2096: /* normal middle part (160 bytes) */
2097: memcpy(pSTScreen+SCREENBYTES_LEFT, pVideoRaster, SCREENBYTES_MIDDLE);
2098: pVideoRaster += SCREENBYTES_MIDDLE;
2099: }
2100:
2101: /* Does have right border ? */
2102: if (LineBorderMask & BORDERMASK_RIGHT_OFF)
2103: {
2104: memcpy(pSTScreen+SCREENBYTES_LEFT+SCREENBYTES_MIDDLE, pVideoRaster, SCREENBYTES_RIGHT);
1.1.1.17 root 2105: pVideoRasterEndLine = pVideoRaster + SCREENBYTES_RIGHT;
1.1.1.16 root 2106: pVideoRaster += BORDERBYTES_RIGHT;
1.1.1.11 root 2107: }
2108: else if (LineBorderMask & BORDERMASK_RIGHT_MINUS_2)
2109: {
2110: /* Shortened line by 2 bytes */
2111: memset(pSTScreen+SCREENBYTES_LEFT+SCREENBYTES_MIDDLE-2, 0, SCREENBYTES_RIGHT+2);
2112: pVideoRaster -= 2;
1.1.1.17 root 2113: pVideoRasterEndLine = pVideoRaster;
1.1.1.11 root 2114: }
2115: else
2116: {
2117: /* Simply clear right border to '0' */
2118: memset(pSTScreen+SCREENBYTES_LEFT+SCREENBYTES_MIDDLE,0,SCREENBYTES_RIGHT);
1.1.1.17 root 2119: pVideoRasterEndLine = pVideoRaster;
1.1.1.11 root 2120: }
2121:
1.1.1.18! root 2122: /* Shifter read bytes and borders can change, but display is blank, so finally clear the line with color 0 */
! 2123: if (LineBorderMask & BORDERMASK_BLANK_LINE)
! 2124: memset(pSTScreen, 0, SCREENBYTES_LINE);
! 2125:
1.1.1.11 root 2126: /* Full right border removal up to the end of the line (cycle 512) */
2127: if (LineBorderMask & BORDERMASK_RIGHT_OFF_FULL)
2128: pVideoRaster += BORDERBYTES_RIGHT_FULL;
2129:
2130: /* Correct the offset for pVideoRaster from BORDERMASK_LEFT_OFF above if needed */
2131: pVideoRaster -= VideoOffset; /* VideoOffset is 0 or -2 */
2132:
2133:
2134: /* STE specific */
1.1.1.13 root 2135: if (!bSteBorderFlag && HWScrollCount) /* Handle STE fine scrolling (HWScrollCount is zero on ST) */
1.1.1.11 root 2136: {
1.1.1.13 root 2137: Uint16 *pScrollAdj; /* Pointer to actual position in line */
1.1.1.11 root 2138: int nNegScrollCnt;
1.1.1.13 root 2139: Uint16 *pScrollEndAddr; /* Pointer to end of the line */
1.1.1.11 root 2140:
2141: nNegScrollCnt = 16 - HWScrollCount;
2142: if (LineBorderMask & BORDERMASK_LEFT_OFF)
2143: pScrollAdj = (Uint16 *)pSTScreen;
1.1.1.16 root 2144: else if (LineBorderMask & BORDERMASK_LEFT_OFF_2_STE)
2145: {
2146: if ( SCREENBYTES_LEFT > BORDERBYTES_LEFT_2_STE )
1.1.1.17 root 2147: pScrollAdj = (Uint16 *)(pSTScreen+8); /* don't scroll the 8 first bytes (keep color 0)*/
1.1.1.16 root 2148: else
2149: pScrollAdj = (Uint16 *)pSTScreen; /* we render less bytes on screen than a real ST, scroll the whole line */
2150: }
1.1.1.11 root 2151: else
2152: pScrollAdj = (Uint16 *)(pSTScreen + SCREENBYTES_LEFT);
1.1.1.16 root 2153:
1.1.1.17 root 2154: /* When shifting the line to the left, we will have 'HWScrollCount' missing pixels at */
2155: /* the end of the line. We must complete these last 16 pixels with pixels from the */
2156: /* video counter last accessed value in pVideoRasterEndLine. */
2157: /* There're 2 passes : */
2158: /* - shift whole line except the last 16 pixels */
2159: /* - shift/complete the last 16 pixels */
2160:
2161: /* Addr of the last byte to shift in the 1st pass (excluding the last 16 pixels of the line) */
1.1.1.11 root 2162: if (LineBorderMask & BORDERMASK_RIGHT_OFF)
2163: pScrollEndAddr = (Uint16 *)(pSTScreen + SCREENBYTES_LINE - 8);
2164: else
2165: pScrollEndAddr = (Uint16 *)(pSTScreen + SCREENBYTES_LEFT + SCREENBYTES_MIDDLE - 8);
2166:
1.1.1.17 root 2167:
2168: if ( LineRes == 1 ) /* med res */
1.1.1.11 root 2169: {
1.1.1.15 root 2170: /* 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 2171: pScrollEndAddr += 2; /* 2 Uint16 = 4 bytes = 16 pixels */
1.1.1.14 root 2172:
1.1.1.17 root 2173: /* Shift the whole line to the left by the given scroll count (except the last 16 pixels) */
1.1.1.14 root 2174: while (pScrollAdj < pScrollEndAddr)
2175: {
2176: do_put_mem_word(pScrollAdj, (do_get_mem_word(pScrollAdj) << HWScrollCount)
2177: | (do_get_mem_word(pScrollAdj+2) >> nNegScrollCnt));
2178: ++pScrollAdj;
2179: }
1.1.1.17 root 2180: /* Handle the last 16 pixels of the line (complete the line with pixels from pVideoRasterEndLine) */
2181: for ( i=0 ; i<2 ; i++ )
2182: do_put_mem_word(pScrollAdj+i, (do_get_mem_word(pScrollAdj+i) << HWScrollCount)
2183: | (do_get_mem_word(pVideoRasterEndLine+i*2) >> nNegScrollCnt));
1.1.1.14 root 2184:
2185: /* Depending on whether $ff8264 or $ff8265 was used to scroll, */
2186: /* we prefetched 16 pixel (4 bytes) */
1.1.1.13 root 2187: if ( HWScrollPrefetch == 1 ) /* $ff8265 prefetches 16 pixels */
2188: pVideoRaster += 2 * 2; /* 2 bitplans */
1.1.1.14 root 2189:
2190: /* If scrolling with $ff8264, there's no prefetch, which means display starts */
2191: /* 16 pixels later but still stops at the normal point (eg we display */
2192: /* (320-16) pixels in low res). We shift the whole line 4 bytes to the right to */
2193: /* get the correct result (using memmove, as src/dest are overlapping). */
2194: else
2195: {
2196: if (LineBorderMask & BORDERMASK_RIGHT_OFF)
2197: memmove ( pSTScreen+4 , pSTScreen , SCREENBYTES_LINE - 4 );
2198: else
2199: memmove ( pSTScreen+4 , pSTScreen , SCREENBYTES_LEFT + SCREENBYTES_MIDDLE - 4 );
2200:
2201: memset ( pSTScreen , 0 , 4 ); /* first 16 pixels are color '0' */
2202: }
1.1.1.11 root 2203: }
1.1.1.14 root 2204:
1.1.1.17 root 2205: else /* low res */
1.1.1.11 root 2206: {
1.1.1.17 root 2207: /* Shift the whole line to the left by the given scroll count (except the last 16 pixels) */
1.1.1.11 root 2208: while (pScrollAdj < pScrollEndAddr)
2209: {
2210: do_put_mem_word(pScrollAdj, (do_get_mem_word(pScrollAdj) << HWScrollCount)
2211: | (do_get_mem_word(pScrollAdj+4) >> nNegScrollCnt));
2212: ++pScrollAdj;
2213: }
1.1.1.17 root 2214: /* Handle the last 16 pixels of the line (complete the line with pixels from pVideoRasterEndLine) */
2215: for ( i=0 ; i<4 ; i++ )
2216: do_put_mem_word(pScrollAdj+i, (do_get_mem_word(pScrollAdj+i) << HWScrollCount)
2217: | (do_get_mem_word(pVideoRasterEndLine+i*2) >> nNegScrollCnt));
1.1.1.13 root 2218:
2219: /* Depending on whether $ff8264 or $ff8265 was used to scroll, */
2220: /* we prefetched 16 pixel (8 bytes) */
2221: if ( HWScrollPrefetch == 1 ) /* $ff8265 prefetches 16 pixels */
2222: pVideoRaster += 4 * 2; /* 4 bitplans */
2223:
2224: /* If scrolling with $ff8264, there's no prefetch, which means display starts */
2225: /* 16 pixels later but still stops at the normal point (eg we display */
2226: /* (320-16) pixels in low res). We shift the whole line 8 bytes to the right to */
2227: /* get the correct result (using memmove, as src/dest are overlapping). */
2228: else
2229: {
2230: if (LineBorderMask & BORDERMASK_RIGHT_OFF)
2231: memmove ( pSTScreen+8 , pSTScreen , SCREENBYTES_LINE - 8 );
2232: else
2233: memmove ( pSTScreen+8 , pSTScreen , SCREENBYTES_LEFT + SCREENBYTES_MIDDLE - 8 );
2234:
2235: memset ( pSTScreen , 0 , 8 ); /* first 16 pixels are color '0' */
2236: }
1.1.1.11 root 2237:
2238: /* On STE, when we have a 230 bytes overscan line and HWScrollCount > 0 */
1.1.1.17 root 2239: /* we must read 6 bytes less than expected if scrolling is using prefetching ($ff8265) */
2240: /* (this is not the case for the 224 bytes overscan which is a multiple of 8) */
1.1.1.11 root 2241: if ( (LineBorderMask & BORDERMASK_LEFT_OFF) && (LineBorderMask & BORDERMASK_RIGHT_OFF) )
1.1.1.17 root 2242: {
2243: if ( HWScrollPrefetch == 1 )
2244: pVideoRaster -= 6; /* we don't add 8 bytes (see above), but 2 */
2245: else
2246: pVideoRaster -= 0;
2247: }
1.1.1.11 root 2248:
2249: }
2250: }
2251:
2252: /* LineWidth is zero on ST. */
2253: /* On STE, the Shifter skips the given amount of words. */
2254: pVideoRaster += LineWidth*2;
2255:
2256: /* On STE, handle modifications of the video counter address $ff8205/07/09 */
2257: /* that occurred while the display was already ON */
1.1.1.16 root 2258: if ( VideoCounterDelayedOffset != 0 )
1.1.1.11 root 2259: {
1.1.1.16 root 2260: pVideoRaster += ( VideoCounterDelayedOffset & ~1 );
2261: // fprintf ( stderr , "adjust video counter offset=%d new video=%x\n" , VideoCounterDelayedOffset , pVideoRaster-STRam );
2262: VideoCounterDelayedOffset = 0;
1.1.1.11 root 2263: }
1.1.1.16 root 2264:
2265: if ( pVideoRasterDelayed != NULL )
1.1.1.11 root 2266: {
1.1.1.16 root 2267: pVideoRaster = pVideoRasterDelayed;
2268: // fprintf ( stderr , "adjust video counter const new video=%x\n" , pVideoRaster-STRam );
2269: pVideoRasterDelayed = NULL;
1.1.1.11 root 2270: }
2271:
2272: /* On STE, if we wrote to the hwscroll register, we set the */
2273: /* new value here, once the current line was processed */
2274: if ( NewHWScrollCount >= 0 )
2275: {
2276: HWScrollCount = NewHWScrollCount;
1.1.1.13 root 2277: HWScrollPrefetch = NewHWScrollPrefetch;
1.1.1.11 root 2278: NewHWScrollCount = -1;
1.1.1.13 root 2279: NewHWScrollPrefetch = -1;
2280: }
2281:
2282: /* On STE, if we trigger the left border + 16 pixels trick, we set the */
2283: /* new value here, once the current line was processed */
2284: if ( NewSteBorderFlag >= 0 )
2285: {
2286: if ( NewSteBorderFlag == 0 )
1.1.1.15 root 2287: bSteBorderFlag = false;
1.1.1.13 root 2288: else
1.1.1.15 root 2289: bSteBorderFlag = true;
1.1.1.13 root 2290: NewSteBorderFlag = -1;
1.1.1.11 root 2291: }
2292:
2293: /* On STE, if we wrote to the linewidth register, we set the */
2294: /* new value here, once the current line was processed */
2295: if ( NewLineWidth >= 0 )
2296: {
2297: LineWidth = NewLineWidth;
2298: NewLineWidth = -1;
2299: }
1.1.1.16 root 2300:
2301:
2302: /* Handle 4 pixels hardware scrolling ('ST Cnx' demo in 'Punish Your Machine') */
2303: /* as well as scrolling occuring when removing the left border. */
2304: /* If >0, shift the line by STF_PixelScroll pixels to the right */
2305: /* If <0, shift the line by -STF_PixelScroll pixels to the left */
2306: /* This should be handled after the STE's hardware scrolling as it will scroll */
2307: /* the whole displayed area (while the STE scrolls pixels inside the displayed area) */
2308: if ( STF_PixelScroll > 0 )
2309: {
2310: Uint16 *pScreenLineEnd;
2311: int count;
2312:
2313: pScreenLineEnd = (Uint16 *) ( pSTScreen + SCREENBYTES_LINE - 2 );
1.1.1.17 root 2314: if ( LineRes == 0 ) /* low res */
2315: {
2316: for ( count = 0 ; count < ( SCREENBYTES_LINE - 8 ) / 2 ; count++ , pScreenLineEnd-- )
2317: do_put_mem_word ( pScreenLineEnd , ( ( do_get_mem_word ( pScreenLineEnd - 4 ) << 16 ) | ( do_get_mem_word ( pScreenLineEnd ) ) ) >> STF_PixelScroll );
2318: /* Handle the first 16 pixels of the line (add color 0 pixels to the extreme left) */
2319: do_put_mem_word ( pScreenLineEnd-0 , ( do_get_mem_word ( pScreenLineEnd-0 ) >> STF_PixelScroll ) );
2320: do_put_mem_word ( pScreenLineEnd-1 , ( do_get_mem_word ( pScreenLineEnd-1 ) >> STF_PixelScroll ) );
2321: do_put_mem_word ( pScreenLineEnd-2 , ( do_get_mem_word ( pScreenLineEnd-2 ) >> STF_PixelScroll ) );
2322: do_put_mem_word ( pScreenLineEnd-3 , ( do_get_mem_word ( pScreenLineEnd-3 ) >> STF_PixelScroll ) );
2323: }
2324: else /* med res */
2325: {
2326: for ( count = 0 ; count < ( SCREENBYTES_LINE - 4 ) / 2 ; count++ , pScreenLineEnd-- )
2327: do_put_mem_word ( pScreenLineEnd , ( ( do_get_mem_word ( pScreenLineEnd - 2 ) << 16 ) | ( do_get_mem_word ( pScreenLineEnd ) ) ) >> STF_PixelScroll );
2328: /* Handle the first 16 pixels of the line (add color 0 pixels to the extreme left) */
2329: do_put_mem_word ( pScreenLineEnd-0 , ( do_get_mem_word ( pScreenLineEnd-0 ) >> STF_PixelScroll ) );
2330: do_put_mem_word ( pScreenLineEnd-1 , ( do_get_mem_word ( pScreenLineEnd-1 ) >> STF_PixelScroll ) );
2331: }
1.1.1.16 root 2332: }
2333: else if ( STF_PixelScroll < 0 )
2334: {
2335: Uint16 *pScreenLineStart;
2336: int count;
2337:
2338: STF_PixelScroll = -STF_PixelScroll;
2339: pScreenLineStart = (Uint16 *)pSTScreen;
1.1.1.17 root 2340: if ( LineRes == 0 ) /* low res */
2341: {
2342: for ( count = 0 ; count < ( SCREENBYTES_LINE - 8 ) / 2 ; count++ , pScreenLineStart++ )
2343: do_put_mem_word ( pScreenLineStart , ( ( do_get_mem_word ( pScreenLineStart ) << STF_PixelScroll ) | ( do_get_mem_word ( pScreenLineStart + 4 ) >> (16-STF_PixelScroll) ) ) );
2344: /* Handle the last 16 pixels of the line (add color 0 pixels to the extreme right) */
2345: do_put_mem_word ( pScreenLineStart+0 , ( do_get_mem_word ( pScreenLineStart+0 ) << STF_PixelScroll ) );
2346: do_put_mem_word ( pScreenLineStart+1 , ( do_get_mem_word ( pScreenLineStart+1 ) << STF_PixelScroll ) );
2347: do_put_mem_word ( pScreenLineStart+2 , ( do_get_mem_word ( pScreenLineStart+2 ) << STF_PixelScroll ) );
2348: do_put_mem_word ( pScreenLineStart+3 , ( do_get_mem_word ( pScreenLineStart+3 ) << STF_PixelScroll ) );
2349: }
2350: else /* med res */
2351: {
2352: for ( count = 0 ; count < ( SCREENBYTES_LINE - 4 ) / 2 ; count++ , pScreenLineStart++ )
2353: do_put_mem_word ( pScreenLineStart , ( ( do_get_mem_word ( pScreenLineStart ) << STF_PixelScroll ) | ( do_get_mem_word ( pScreenLineStart + 2 ) >> (16-STF_PixelScroll) ) ) );
2354: /* Handle the last 16 pixels of the line (add color 0 pixels to the extreme right) */
2355: do_put_mem_word ( pScreenLineStart+0 , ( do_get_mem_word ( pScreenLineStart+0 ) << STF_PixelScroll ) );
2356: do_put_mem_word ( pScreenLineStart+1 , ( do_get_mem_word ( pScreenLineStart+1 ) << STF_PixelScroll ) );
2357: }
1.1.1.16 root 2358: }
1.1.1.11 root 2359: }
2360:
2361: /* Each screen line copied to buffer is always same length */
2362: pSTScreen += SCREENBYTES_LINE;
2363: }
2364:
2365:
2366: /*-----------------------------------------------------------------------*/
2367: /**
2368: * Copy extended GEM resolution screen
2369: */
1.1.1.9 root 2370: static void Video_CopyVDIScreen(void)
1.1 root 2371: {
1.1.1.11 root 2372: /* Copy whole screen, don't care about being exact as for GEM only */
2373: memcpy(pSTScreen, pVideoRaster, ((VDIWidth*VDIPlanes)/8)*VDIHeight);
1.1 root 2374: }
2375:
1.1.1.2 root 2376:
2377: /*-----------------------------------------------------------------------*/
1.1.1.11 root 2378: /**
2379: * Clear raster line table to store changes in palette/resolution on a line
2380: * basic. Called once on VBL interrupt.
2381: */
1.1 root 2382: void Video_SetScreenRasters(void)
2383: {
1.1.1.11 root 2384: pHBLPaletteMasks = HBLPaletteMasks;
2385: pHBLPalettes = HBLPalettes;
2386: memset(pHBLPaletteMasks, 0, sizeof(Uint32)*NUM_VISIBLE_LINES); /* Clear array */
1.1 root 2387: }
2388:
1.1.1.2 root 2389:
2390: /*-----------------------------------------------------------------------*/
1.1.1.11 root 2391: /**
2392: * Set pointers to HBLPalette tables to store correct colours/resolutions
2393: */
1.1.1.9 root 2394: static void Video_SetHBLPaletteMaskPointers(void)
1.1 root 2395: {
1.1.1.15 root 2396: int FrameCycles, HblCounterVideo, LineCycles;
1.1.1.11 root 2397: int Line;
2398:
2399: /* FIXME [NP] We should use Cycles_GetCounterOnWriteAccess, but it wouldn't */
2400: /* work when using multiple accesses instructions like move.l or movem */
1.1.1.15 root 2401: /* To correct this, we assume a delay of 8 cycles (should give a good approximation */
1.1.1.11 root 2402: /* of a move.w or movem.l for example) */
2403: // FrameCycles = Cycles_GetCounterOnWriteAccess(CYCLES_COUNTER_VIDEO);
2404: FrameCycles = Cycles_GetCounter(CYCLES_COUNTER_VIDEO) + 8;
2405:
2406: /* Find 'line' into palette - screen starts 63 lines down, less 29 for top overscan */
1.1.1.15 root 2407: Video_ConvertPosition ( FrameCycles , &HblCounterVideo , &LineCycles );
2408: Line = HblCounterVideo - nFirstVisibleHbl;
1.1.1.11 root 2409:
2410: /* FIXME [NP] if the color change occurs after the last visible pixel of a line */
2411: /* we consider the palette should be modified on the next line. This is quite */
2412: /* a hack, we should handle all color changes through spec512.c to have cycle */
2413: /* accuracy all the time. */
1.1.1.15 root 2414: if ( LineCycles >= LINE_END_CYCLE_NO_RIGHT )
2415: Line++;
1.1.1.11 root 2416:
2417: if (Line < 0) /* Limit to top/bottom of possible visible screen */
2418: Line = 0;
2419: if (Line >= NUM_VISIBLE_LINES)
2420: Line = NUM_VISIBLE_LINES-1;
2421:
2422: /* Store pointers */
2423: pHBLPaletteMasks = &HBLPaletteMasks[Line]; /* Next mask entry */
2424: pHBLPalettes = &HBLPalettes[16*Line]; /* Next colour raster list x16 colours */
1.1 root 2425: }
1.1.1.8 root 2426:
2427:
1.1.1.9 root 2428: /*-----------------------------------------------------------------------*/
1.1.1.11 root 2429: /**
2430: * Set video shifter timing variables according to screen refresh rate.
2431: * Note: The following equation must be satisfied for correct timings:
2432: *
2433: * nCyclesPerLine * nScanlinesPerFrame * nScreenRefreshRate = 8 MHz
2434: */
1.1.1.10 root 2435: static void Video_ResetShifterTimings(void)
2436: {
1.1.1.11 root 2437: Uint8 nSyncByte;
1.1.1.10 root 2438:
1.1.1.11 root 2439: nSyncByte = IoMem_ReadByte(0xff820a);
1.1.1.10 root 2440:
1.1.1.11 root 2441: if (bUseHighRes)
2442: {
2443: /* 71 Hz, monochrome */
2444: nScreenRefreshRate = 71;
2445: nScanlinesPerFrame = SCANLINES_PER_FRAME_71HZ;
2446: nCyclesPerLine = CYCLES_PER_LINE_71HZ;
1.1.1.13 root 2447: nStartHBL = VIDEO_START_HBL_71HZ;
1.1.1.11 root 2448: nFirstVisibleHbl = FIRST_VISIBLE_HBL_71HZ;
1.1.1.13 root 2449: nLastVisibleHbl = FIRST_VISIBLE_HBL_71HZ + VIDEO_HEIGHT_HBL_MONO;
1.1.1.11 root 2450: }
2451: else if (nSyncByte & 2) /* Check if running in 50 Hz or in 60 Hz */
2452: {
2453: /* 50 Hz */
2454: nScreenRefreshRate = 50;
2455: nScanlinesPerFrame = SCANLINES_PER_FRAME_50HZ;
2456: nCyclesPerLine = CYCLES_PER_LINE_50HZ;
1.1.1.13 root 2457: nStartHBL = VIDEO_START_HBL_50HZ;
1.1.1.11 root 2458: nFirstVisibleHbl = FIRST_VISIBLE_HBL_50HZ;
1.1.1.13 root 2459: nLastVisibleHbl = FIRST_VISIBLE_HBL_50HZ + NUM_VISIBLE_LINES;
1.1.1.11 root 2460: }
2461: else
2462: {
2463: /* 60 Hz */
2464: nScreenRefreshRate = 60;
2465: nScanlinesPerFrame = SCANLINES_PER_FRAME_60HZ;
2466: nCyclesPerLine = CYCLES_PER_LINE_60HZ;
1.1.1.13 root 2467: nStartHBL = VIDEO_START_HBL_60HZ;
1.1.1.11 root 2468: nFirstVisibleHbl = FIRST_VISIBLE_HBL_60HZ;
1.1.1.13 root 2469: nLastVisibleHbl = FIRST_VISIBLE_HBL_60HZ + NUM_VISIBLE_LINES;
1.1.1.11 root 2470: }
2471:
2472: if (bUseHighRes)
2473: {
1.1.1.13 root 2474: nEndHBL = nStartHBL + VIDEO_HEIGHT_HBL_MONO;
1.1.1.11 root 2475: }
2476: else
2477: {
1.1.1.13 root 2478: nEndHBL = nStartHBL + VIDEO_HEIGHT_HBL_COLOR;
1.1.1.11 root 2479: }
2480:
2481: /* Reset freq changes position for the next VBL to come */
1.1.1.13 root 2482: LastCycleScroll8264 = -1;
2483: LastCycleScroll8265 = -1;
1.1.1.15 root 2484:
2485: TimerBEventCountCycleStart = -1; /* reset timer B activation cycle for this VBL */
2486:
2487: LastCycleHblException = -1;
1.1.1.18! root 2488:
! 2489: BlankLines = 0;
1.1.1.11 root 2490: }
1.1.1.10 root 2491:
2492:
1.1.1.11 root 2493: /*-----------------------------------------------------------------------*/
2494: /**
1.1.1.15 root 2495: * Clear the array indicating the state of each video line.
1.1.1.11 root 2496: */
1.1.1.15 root 2497: static void Video_InitShifterLines ( void )
1.1.1.11 root 2498: {
1.1.1.15 root 2499: int i;
2500:
2501: for ( i=0 ; i<MAX_SCANLINES_PER_FRAME ; i++ )
2502: {
2503: ShifterFrame.ShifterLines[i].BorderMask = 0;
2504: ShifterFrame.ShifterLines[i].DisplayPixelShift = 0;
2505: ShifterFrame.ShifterLines[i].DisplayStartCycle = -1;
2506: }
2507:
2508: ShifterFrame.ShifterLines[0].StartCycle = 0; /* 1st HBL starts at cycle 0 */
1.1.1.10 root 2509: }
2510:
2511:
2512: /*-----------------------------------------------------------------------*/
1.1.1.11 root 2513: /**
2514: * Called on VBL, set registers ready for frame
2515: */
1.1.1.9 root 2516: static void Video_ClearOnVBL(void)
2517: {
1.1.1.11 root 2518: /* New screen, so first HBL */
2519: nHBL = 0;
2520: OverscanMode = OVERSCANMODE_NONE;
2521:
2522: Video_ResetShifterTimings();
2523:
2524: /* Get screen address pointer, aligned to 256 bytes on ST (ie ignore lowest byte) */
2525: VideoBase = (Uint32)IoMem_ReadByte(0xff8201)<<16 | (Uint32)IoMem_ReadByte(0xff8203)<<8;
2526: if (ConfigureParams.System.nMachineType != MACHINE_ST)
2527: {
2528: /* on STe 2 aligned, on Falcon 4 aligned, on TT 8 aligned. We do STe. */
2529: VideoBase |= IoMem_ReadByte(0xff820d) & ~1;
2530: }
2531: pVideoRaster = &STRam[VideoBase];
2532: pSTScreen = pFrameBuffer->pSTScreen;
2533:
2534: Video_SetScreenRasters();
1.1.1.15 root 2535: Video_InitShifterLines();
1.1.1.11 root 2536: Spec512_StartVBL();
1.1.1.15 root 2537: Video_StartHBL(); /* Init ShifterFrame.ShifterLines[0] */
1.1.1.11 root 2538: }
2539:
2540:
2541: /*-----------------------------------------------------------------------*/
2542: /**
2543: * Get width, height and bpp according to TT-Resolution
2544: */
2545: void Video_GetTTRes(int *width, int *height, int *bpp)
2546: {
2547: switch (TTRes)
2548: {
2549: case ST_LOW_RES: *width = 320; *height = 200; *bpp = 4; break;
2550: case ST_MEDIUM_RES:*width = 640; *height = 200; *bpp = 2; break;
2551: case ST_HIGH_RES: *width = 640; *height = 400; *bpp = 1; break;
2552: case TT_LOW_RES: *width = 320; *height = 480; *bpp = 8; break;
2553: case TT_MEDIUM_RES:*width = 640; *height = 480; *bpp = 4; break;
2554: case TT_HIGH_RES: *width = 1280; *height = 960; *bpp = 1; break;
2555: default:
2556: fprintf(stderr, "TT res error!\n");
2557: *width = 320; *height = 200; *bpp = 4;
2558: break;
2559: }
2560: }
2561:
2562:
2563: /*-----------------------------------------------------------------------*/
2564: /**
2565: * Convert TT palette to SDL palette
2566: */
2567: static void Video_UpdateTTPalette(int bpp)
2568: {
2569: Uint32 ttpalette, src, dst;
2570: Uint8 r,g,b, lowbyte, highbyte;
2571: Uint16 stcolor, ttcolor;
2572: int i, offset, colors;
2573:
2574: ttpalette = 0xff8400;
2575:
2576: if (!bTTColorsSTSync)
2577: {
2578: /* sync TT ST-palette to TT-palette */
2579: src = 0xff8240; /* ST-palette */
2580: offset = (IoMem_ReadWord(0xff8262) & 0x0f);
1.1.1.13 root 2581: /*fprintf(stderr, "offset: %d\n", offset);*/
1.1.1.11 root 2582: dst = ttpalette + offset * 16*SIZE_WORD;
2583:
2584: for (i = 0; i < 16; i++)
2585: {
2586: stcolor = IoMem_ReadWord(src);
2587: ttcolor = ((stcolor&0x700) << 1) | ((stcolor&0x70) << 1) | ((stcolor&0x7) << 1);
2588: IoMem_WriteWord(dst, ttcolor);
2589: src += SIZE_WORD;
2590: dst += SIZE_WORD;
2591: }
1.1.1.15 root 2592: bTTColorsSTSync = true;
1.1.1.11 root 2593: }
2594:
2595: colors = 1 << bpp;
2596: if (bpp == 1)
2597: {
2598: /* Monochrome mode... palette is hardwired (?) */
2599: HostScreen_setPaletteColor(0, 255, 255, 255);
2600: HostScreen_setPaletteColor(1, 0, 0, 0);
2601: }
2602: else
2603: {
2604: for (i = 0; i < colors; i++)
2605: {
2606: lowbyte = IoMem_ReadByte(ttpalette++);
2607: highbyte = IoMem_ReadByte(ttpalette++);
2608: r = (lowbyte & 0x0f) << 4;
2609: g = (highbyte & 0xf0);
2610: b = (highbyte & 0x0f) << 4;
2611: //printf("%d: (%d,%d,%d)\n", i,r,g,b);
2612: HostScreen_setPaletteColor(i, r,g,b);
2613: }
2614: }
2615:
2616: HostScreen_updatePalette(colors);
1.1.1.15 root 2617: bTTColorsSync = true;
1.1.1.11 root 2618: }
2619:
2620:
2621: /*-----------------------------------------------------------------------*/
2622: /**
1.1.1.13 root 2623: * Update TT palette and blit TT screen using VIDEL code.
2624: * @return true if the screen contents changed
1.1.1.11 root 2625: */
1.1.1.16 root 2626: bool Video_RenderTTScreen(void)
1.1.1.11 root 2627: {
2628: static int nPrevTTRes = -1;
2629: int width, height, bpp;
2630:
2631: Video_GetTTRes(&width, &height, &bpp);
2632: if (TTRes != nPrevTTRes)
2633: {
2634: HostScreen_setWindowSize(width, height, 8);
2635: nPrevTTRes = TTRes;
2636: if (bpp == 1) /* Assert that mono palette will be used in mono mode */
1.1.1.15 root 2637: bTTColorsSync = false;
1.1.1.11 root 2638: }
2639:
2640: /* colors need synching? */
2641: if (!(bTTColorsSync && bTTColorsSTSync))
2642: {
2643: Video_UpdateTTPalette(bpp);
2644: }
2645:
2646: /* Yes, we are abusing the Videl routines for rendering the TT modes! */
2647: if (!HostScreen_renderBegin())
1.1.1.13 root 2648: return false;
1.1.1.16 root 2649: if (nScreenZoomX * nScreenZoomY != 1)
1.1.1.11 root 2650: VIDEL_ConvertScreenZoom(width, height, bpp, width * bpp / 16);
2651: else
2652: VIDEL_ConvertScreenNoZoom(width, height, bpp, width * bpp / 16);
2653: HostScreen_renderEnd();
1.1.1.15 root 2654: HostScreen_update1(false);
1.1.1.13 root 2655:
2656: return true;
1.1.1.11 root 2657: }
2658:
2659:
2660: /*-----------------------------------------------------------------------*/
2661: /**
2662: * Draw screen (either with ST/STE shifter drawing functions or with
2663: * Videl drawing functions)
2664: */
2665: static void Video_DrawScreen(void)
2666: {
2667: /* Skip frame if need to */
1.1.1.13 root 2668: if (nVBLs % (nFrameSkips+1))
1.1.1.11 root 2669: return;
2670:
2671: /* Use extended VDI resolution?
2672: * If so, just copy whole screen on VBL rather than per HBL */
2673: if (bUseVDIRes)
2674: Video_CopyVDIScreen();
2675:
2676: /* Now draw the screen! */
2677: if (ConfigureParams.System.nMachineType == MACHINE_FALCON && !bUseVDIRes)
2678: {
1.1.1.17 root 2679: VIDEL_renderScreen();
1.1.1.11 root 2680: }
2681: else if (ConfigureParams.System.nMachineType == MACHINE_TT && !bUseVDIRes)
2682: {
1.1.1.17 root 2683: Video_RenderTTScreen();
1.1.1.11 root 2684: }
2685: else
1.1.1.13 root 2686: {
2687: /* Before drawing the screen, ensure all unused lines are cleared to color 0 */
2688: /* (this can happen in 60 Hz when hatari is displaying the screen's border) */
2689: /* pSTScreen was set during Video_CopyScreenLineColor */
1.1.1.14 root 2690: if (!bUseVDIRes && nHBL < nLastVisibleHbl)
1.1.1.13 root 2691: memset(pSTScreen, 0, SCREENBYTES_LINE * ( nLastVisibleHbl - nHBL ) );
2692:
1.1.1.17 root 2693: Screen_Draw();
1.1.1.13 root 2694: }
1.1.1.11 root 2695: }
2696:
2697:
2698: /*-----------------------------------------------------------------------*/
2699: /**
1.1.1.15 root 2700: * Start HBL, Timer B and VBL interrupts.
2701: */
2702:
2703:
2704: /**
2705: * Start HBL or Timer B interrupt at position Pos. If position Pos was
2706: * already reached, then the interrupt is set on the next line.
2707: */
2708:
2709: static void Video_AddInterrupt ( int Pos , interrupt_id Handler )
2710: {
2711: int FrameCycles , HblCounterVideo , LineCycles;
2712:
2713: if ( nHBL >= nScanlinesPerFrame )
2714: return; /* don't set a new hbl/timer B if we're on the last line, as the vbl will happen first */
2715:
2716: Video_GetPosition ( &FrameCycles , &HblCounterVideo , &LineCycles );
1.1.1.16 root 2717: //fprintf ( stderr , "add int pos=%d handler=%d LineCycles=%d nCyclesPerLine=%d \n" , Pos , Handler , LineCycles , nCyclesPerLine );
1.1.1.15 root 2718:
2719: if ( LineCycles < Pos ) /* changed before reaching the new Pos on the current line */
1.1.1.16 root 2720: CycInt_AddRelativeInterrupt ( Pos - LineCycles , INT_CPU_CYCLE, Handler );
1.1.1.15 root 2721: else /* Pos will be applied on next line */
1.1.1.16 root 2722: CycInt_AddRelativeInterrupt ( Pos - LineCycles + nCyclesPerLine , INT_CPU_CYCLE, Handler );
1.1.1.15 root 2723: }
2724:
2725:
2726: static void Video_AddInterruptHBL ( int Pos )
2727: {
1.1.1.16 root 2728: //fprintf ( stderr , "add hbl pos=%d\n" , Pos );
1.1.1.15 root 2729: if ( !bUseVDIRes )
2730: Video_AddInterrupt ( Pos , INTERRUPT_VIDEO_HBL );
2731: }
2732:
2733:
2734: void Video_AddInterruptTimerB ( int Pos )
2735: {
1.1.1.16 root 2736: //fprintf ( stderr , "add timerb pos=%d\n" , Pos );
1.1.1.15 root 2737: if ( !bUseVDIRes )
2738: Video_AddInterrupt ( Pos , INTERRUPT_VIDEO_ENDLINE );
2739: }
2740:
2741:
2742: /**
2743: * Add some video interrupts to handle the first HBL and the first Timer B
2744: * in a new VBL. Also add an interrupt to trigger the next VBL.
2745: * This function is called from the VBL, so we use PendingCycleOver to take into account
2746: * the possible delay occurring when the VBL was executed.
1.1.1.16 root 2747: * In monochrome mode (71 Hz) a line is 224 cycles, which means if VBL is delayed
2748: * by a DIVS, FrameCycles can already be > 224 and we need to add an immediate
2749: * interrupt for hbl/timer in the next 4/8 cycles (else crash might happen as
2750: * line 0 processing would be skipped).
1.1.1.11 root 2751: */
1.1.1.15 root 2752: void Video_StartInterrupts ( int PendingCyclesOver )
1.1.1.11 root 2753: {
1.1.1.16 root 2754: int FrameCycles , HblCounterVideo , LineCycles;
2755: int Pos;
2756:
1.1.1.15 root 2757: /* HBL/Timer B are not emulated in VDI mode */
1.1.1.14 root 2758: if (!bUseVDIRes)
2759: {
1.1.1.16 root 2760: Video_GetPosition ( &FrameCycles , &HblCounterVideo , &LineCycles );
1.1.1.15 root 2761:
1.1.1.16 root 2762: /* Set Timer B interrupt for line 0 */
2763: Pos = Video_TimerB_GetPos ( 0 );
2764: if ( Pos > FrameCycles ) /* check Pos for line 0 was not already reached */
2765: Video_AddInterruptTimerB ( Pos );
2766: else /* the VBL was delayed by more than 1 HBL, add an immediate timer B */
2767: {
2768: LOG_TRACE(TRACE_VIDEO_VBL , "VBL %d delayed too much video_cyc=%d >= pos=%d for first timer B, add immediate timer B\n" ,
2769: nVBLs , FrameCycles , Pos );
2770: CycInt_AddRelativeInterrupt ( 4 , INT_CPU_CYCLE, INTERRUPT_VIDEO_ENDLINE );
2771: }
2772:
2773: /* Set HBL interrupt for line 0 */
2774: Pos = Video_HBL_GetPos();
2775: if ( Pos > FrameCycles ) /* check Pos for line 0 was not already reached */
2776: Video_AddInterruptHBL ( Pos );
2777: else /* the VBL was delayed by more than 1 HBL, add an immediate HBL */
2778: {
2779: LOG_TRACE(TRACE_VIDEO_VBL , "VBL %d delayed too much video_cyc=%d >= pos=%d for first HBL, add immediate HBL\n" ,
2780: nVBLs , FrameCycles , Pos );
2781: CycInt_AddRelativeInterrupt ( 8 , INT_CPU_CYCLE, INTERRUPT_VIDEO_HBL ); /* use 8 instead of 4 to happen after immediate timer b */
2782: }
1.1.1.14 root 2783: }
1.1.1.15 root 2784:
2785: /* TODO replace CYCLES_PER_FRAME */
1.1.1.16 root 2786: CyclesPerVBL = CYCLES_PER_FRAME;
1.1.1.18! root 2787: /* Note: Refresh rate less than 50 Hz does not make sense! */
! 2788: assert(CyclesPerVBL <= CPU_FREQ/49);
! 2789: /* Add new VBL interrupt: */
1.1.1.16 root 2790: CycInt_AddRelativeInterrupt(CyclesPerVBL - PendingCyclesOver, INT_CPU_CYCLE, INTERRUPT_VIDEO_VBL);
1.1.1.11 root 2791: }
2792:
2793:
2794: /*-----------------------------------------------------------------------*/
2795: /**
1.1.1.15 root 2796: * VBL interrupt : set new interrupts, draw screen, generate sound,
2797: * reset counters, ...
1.1.1.11 root 2798: */
1.1.1.15 root 2799: void Video_InterruptHandler_VBL ( void )
1.1.1.11 root 2800: {
2801: int PendingCyclesOver;
1.1.1.9 root 2802:
1.1.1.11 root 2803: /* Store cycles we went over for this frame(this is our inital count) */
2804: PendingCyclesOver = -INT_CONVERT_FROM_INTERNAL ( PendingInterruptCount , INT_CPU_CYCLE ); /* +ve */
1.1.1.10 root 2805:
1.1.1.11 root 2806: /* Remove this interrupt from list and re-order */
1.1.1.16 root 2807: CycInt_AcknowledgeInterrupt();
1.1.1.9 root 2808:
1.1.1.14 root 2809: /* Increment the vbl jitter index */
2810: VblJitterIndex++;
2811: if ( VblJitterIndex == VBL_JITTER_MAX_POS )
2812: VblJitterIndex = 0;
2813:
1.1.1.11 root 2814: /* Set frame cycles, used for Video Address */
1.1.1.13 root 2815: Cycles_SetCounter(CYCLES_COUNTER_VIDEO, PendingCyclesOver + VblVideoCycleOffset);
1.1.1.9 root 2816:
1.1.1.11 root 2817: /* Clear any key presses which are due to be de-bounced (held for one ST frame) */
2818: Keymap_DebounceAllKeys();
1.1.1.9 root 2819:
1.1.1.11 root 2820: Video_DrawScreen();
1.1.1.9 root 2821:
1.1.1.11 root 2822: /* Check printer status */
2823: Printer_CheckIdleStatus();
2824:
2825: /* Update counter for number of screen refreshes per second */
2826: nVBLs++;
2827: /* Set video registers for frame */
2828: Video_ClearOnVBL();
1.1.1.15 root 2829:
1.1.1.17 root 2830: /* Videl Vertical counter reset (To be removed when Videl emulation is finished) */
2831: if (ConfigureParams.System.nMachineType == MACHINE_FALCON) {
2832: vfc_counter = 0;
2833: }
2834:
1.1.1.15 root 2835: /* Since we don't execute HBL functions in VDI mode, we've got to
2836: * initialize the first HBL palette here when VDI mode is enabled. */
2837: if (bUseVDIRes)
2838: Video_StoreFirstLinePalette();
2839:
2840: /* Start VBL, HBL and Timer B interrupts (this must be done after resetting
2841: * video cycle counter setting default freq values in Video_ClearOnVBL) */
2842: Video_StartInterrupts(PendingCyclesOver);
2843:
2844: /* Act on shortcut keys */
2845: ShortCut_ActKey();
2846:
1.1.1.16 root 2847: /* Record video frame is necessary */
2848: if ( bRecordingAvi )
2849: Avi_RecordVideoStream ();
2850:
1.1.1.11 root 2851: /* Store off PSG registers for YM file, is enabled */
2852: YMFormat_UpdateRecording();
2853: /* Generate 1/50th second of sound sample data, to be played by sound thread */
2854: Sound_Update_VBL();
2855:
1.1.1.15 root 2856: LOG_TRACE(TRACE_VIDEO_VBL , "VBL %d video_cyc=%d pending_cyc=%d jitter=%d\n" ,
1.1.1.14 root 2857: nVBLs , Cycles_GetCounter(CYCLES_COUNTER_VIDEO) , PendingCyclesOver , VblJitterArray[ VblJitterIndex ] );
1.1.1.11 root 2858:
1.1.1.16 root 2859: M68000_Exception(EXCEPTION_VBLANK, M68000_EXC_SRC_AUTOVEC); /* Vertical blank interrupt, level 4! */
1.1.1.11 root 2860:
2861: Main_WaitOnVbl();
1.1.1.9 root 2862: }
2863:
2864:
2865: /*-----------------------------------------------------------------------*/
1.1.1.11 root 2866: /**
1.1.1.13 root 2867: * Write to video address base high, med and low register (0xff8201/03/0d).
2868: * On STE, when a program writes to high or med registers, base low register
2869: * is reset to zero.
1.1.1.11 root 2870: */
1.1.1.9 root 2871: void Video_ScreenBaseSTE_WriteByte(void)
2872: {
1.1.1.13 root 2873: if ( ( IoAccessCurrentAddress == 0xff8201 ) || ( IoAccessCurrentAddress == 0xff8203 ) )
2874: IoMem[0xff820d] = 0; /* Reset screen base low register */
1.1.1.8 root 2875:
1.1.1.15 root 2876: if (LOG_TRACE_LEVEL(TRACE_VIDEO_STE))
1.1.1.11 root 2877: {
1.1.1.15 root 2878: int FrameCycles, HblCounterVideo, LineCycles;
2879:
2880: Video_GetPosition_OnWriteAccess ( &FrameCycles , &HblCounterVideo , &LineCycles );
2881:
2882: 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 2883: (IoMem[0xff8201]<<16)+(IoMem[0xff8203]<<8)+IoMem[0xff820d] ,
1.1.1.15 root 2884: FrameCycles, LineCycles, nHBL, HblCounterVideo, M68000_GetPC(), CurrentInstrCycles );
1.1.1.11 root 2885: }
1.1.1.8 root 2886: }
2887:
2888: /*-----------------------------------------------------------------------*/
1.1.1.11 root 2889: /**
2890: * Read video address counter and update ff8205/07/09
2891: */
2892: void Video_ScreenCounter_ReadByte(void)
1.1.1.8 root 2893: {
1.1.1.11 root 2894: Uint32 addr;
1.1.1.8 root 2895:
1.1.1.11 root 2896: addr = Video_CalculateAddress(); /* get current video address */
2897: IoMem[0xff8205] = ( addr >> 16 ) & 0xff;
2898: IoMem[0xff8207] = ( addr >> 8 ) & 0xff;
2899: IoMem[0xff8209] = addr & 0xff;
1.1.1.8 root 2900: }
2901:
1.1.1.9 root 2902: /*-----------------------------------------------------------------------*/
1.1.1.11 root 2903: /**
2904: * Write to video address counter (0xff8205, 0xff8207 and 0xff8209).
2905: * Called on STE only and like with base address, you cannot set lowest bit.
1.1.1.16 root 2906: *
2907: * As Hatari processes/converts one complete video line at a time, we have 3 cases :
2908: * - If display has not started yet for this line (left border), we can change pVideoRaster now.
2909: * We must take into account that the MMU starts 16 cycles earlier when hscroll is used.
2910: * - If display has stopped for this line (right border), we will change pVideoRaster
2911: * in Video_CopyScreenLineColor using pVideoRasterDelayed once the line has been processed.
2912: * - If the write is made while display is on, then we must compute an offset of what
2913: * the new address should have been, to correctly emulate the video address at the
2914: * end of the line while taking into account the fact that the video pointer is incrementing
2915: * during the active part of the line (this is the most "tricky" case)
2916: *
2917: * 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 2918: */
1.1.1.9 root 2919: void Video_ScreenCounter_WriteByte(void)
2920: {
1.1.1.11 root 2921: Uint8 AddrByte;
1.1.1.16 root 2922: Uint32 addr_cur;
2923: Uint32 addr_new = 0;
1.1.1.15 root 2924: int FrameCycles, HblCounterVideo, LineCycles;
1.1.1.13 root 2925: int Delayed;
1.1.1.16 root 2926: int MMUStartCycle;
1.1.1.11 root 2927:
1.1.1.15 root 2928: Video_GetPosition_OnWriteAccess ( &FrameCycles , &HblCounterVideo , &LineCycles );
1.1.1.11 root 2929:
2930: AddrByte = IoMem[ IoAccessCurrentAddress ];
2931:
1.1.1.16 root 2932: /* Get current video address from the shifter */
2933: addr_cur = Video_CalculateAddress();
2934: /* Correct the address in case a modification of ff8205/07/09 was already delayed */
2935: addr_new = addr_cur + VideoCounterDelayedOffset;
2936: /* Correct the address in case video counter was already modified in the right border */
2937: if ( pVideoRasterDelayed != NULL )
2938: addr_new = pVideoRasterDelayed - STRam;
2939:
2940: /* addr_new should now be the same as on a real STE */
2941: /* Compute the new video address with one modified byte */
2942: if ( IoAccessCurrentAddress == 0xff8205 )
2943: addr_new = ( addr_new & 0x00ffff ) | ( AddrByte << 16 );
2944: else if ( IoAccessCurrentAddress == 0xff8207 )
2945: addr_new = ( addr_new & 0xff00ff ) | ( AddrByte << 8 );
2946: else if ( IoAccessCurrentAddress == 0xff8209 )
2947: addr_new = ( addr_new & 0xffff00 ) | ( AddrByte );
2948:
2949: MMUStartCycle = Video_GetMMUStartCycle ( ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle );
2950:
1.1.1.11 root 2951: /* If display has not started, we can still modify pVideoRaster */
1.1.1.16 root 2952: /* We must also check the write does not overlap the end of the line (to be sure Video_EndHBL is called first) */
2953: if ( ( ( LineCycles <= MMUStartCycle ) && ( nHBL == HblCounterVideo ) )
1.1.1.18! root 2954: || ( nHBL < nStartHBL ) || ( nHBL >= nEndHBL + BlankLines ) )
1.1.1.11 root 2955: {
1.1.1.16 root 2956: pVideoRaster = &STRam[addr_new & ~1]; /* set new video address */
2957: VideoCounterDelayedOffset = 0;
2958: pVideoRasterDelayed = NULL;
1.1.1.15 root 2959: Delayed = false;
1.1.1.11 root 2960: }
2961:
1.1.1.16 root 2962: /* Display is OFF (right border) but we can't change pVideoRaster now, we must process Video_CopyScreenLineColor first */
1.1.1.18! root 2963: else if ( ( nHBL >= nStartHBL ) && ( nHBL < nEndHBL + BlankLines ) /* line should be active */
1.1.1.16 root 2964: && ( ( LineCycles > ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle ) /* we're in the right border */
2965: || ( HblCounterVideo == nHBL+1 ) ) ) /* or the write overlaps the next line and Video_EndHBL was not called yet */
2966: {
2967: VideoCounterDelayedOffset = 0;
2968: pVideoRasterDelayed = &STRam[addr_new & ~1]; /* new value for pVideoRaster at the end of Video_CopyScreenLineColor */
2969: Delayed = true;
2970: }
2971:
2972: /* Counter is modified while display is ON, store the bytes offset for Video_CopyScreenLineColor */
2973: /* Even on a real STE, modifying video address in this case will cause artefacts */
1.1.1.11 root 2974: else
2975: {
1.1.1.16 root 2976: VideoCounterDelayedOffset = addr_new - addr_cur;
2977: pVideoRasterDelayed = NULL;
1.1.1.15 root 2978: Delayed = true;
1.1.1.11 root 2979: }
2980:
1.1.1.16 root 2981: LOG_TRACE(TRACE_VIDEO_STE , "write ste video %x val=0x%x video_old=%x video_new=%x offset=%x delayed=%s"
2982: " video_cyc_w=%d line_cyc_w=%d @ nHBL=%d/video_hbl_w=%d pc=%x instr_cyc=%d\n" ,
2983: IoAccessCurrentAddress, AddrByte, addr_cur , addr_new , VideoCounterDelayedOffset , Delayed ? "yes" : "no" ,
1.1.1.15 root 2984: FrameCycles, LineCycles, nHBL, HblCounterVideo, M68000_GetPC(), CurrentInstrCycles );
1.1.1.9 root 2985: }
1.1.1.8 root 2986:
2987: /*-----------------------------------------------------------------------*/
1.1.1.11 root 2988: /**
2989: * Read video sync register (0xff820a)
2990: */
1.1.1.8 root 2991: void Video_Sync_ReadByte(void)
2992: {
1.1.1.17 root 2993: if ( (ConfigureParams.System.nMachineType == MACHINE_ST)
2994: || (ConfigureParams.System.nMachineType == MACHINE_STE)
2995: || (ConfigureParams.System.nMachineType == MACHINE_MEGA_STE) )
1.1.1.14 root 2996: IoMem[0xff820a] |= 0xfc; /* set unused bits 2-7 to 1 */
1.1.1.8 root 2997: }
2998:
2999: /*-----------------------------------------------------------------------*/
1.1.1.11 root 3000: /**
3001: * Read video base address low byte (0xff820d). A plain ST can only store
3002: * screen addresses rounded to 256 bytes (i.e. no lower byte).
3003: */
1.1.1.8 root 3004: void Video_BaseLow_ReadByte(void)
3005: {
1.1.1.11 root 3006: if (ConfigureParams.System.nMachineType == MACHINE_ST)
3007: IoMem[0xff820d] = 0; /* On ST this is always 0 */
1.1.1.9 root 3008:
1.1.1.11 root 3009: /* Note that you should not do anything here for STe because
3010: * VideoBase address is set in an interrupt and would be wrong
3011: * here. It's fine like this.
3012: */
1.1.1.8 root 3013: }
3014:
3015: /*-----------------------------------------------------------------------*/
1.1.1.11 root 3016: /**
3017: * Read video line width register (0xff820f)
3018: */
1.1.1.8 root 3019: void Video_LineWidth_ReadByte(void)
3020: {
1.1.1.11 root 3021: if (ConfigureParams.System.nMachineType == MACHINE_ST)
3022: IoMem[0xff820f] = 0; /* On ST this is always 0 */
1.1.1.18! root 3023:
! 3024: /* If we're not in STF mode, we use the value already stored in $ff820f */
1.1.1.8 root 3025: }
3026:
3027: /*-----------------------------------------------------------------------*/
1.1.1.11 root 3028: /**
3029: * Read video shifter mode register (0xff8260)
3030: */
1.1.1.8 root 3031: void Video_ShifterMode_ReadByte(void)
3032: {
1.1.1.11 root 3033: if (bUseHighRes)
1.1.1.14 root 3034: IoMem[0xff8260] = 2; /* If mono monitor, force to high resolution */
1.1.1.11 root 3035: else
1.1.1.17 root 3036: IoMem[0xff8260] = VideoShifterByte; /* Only use bits 0 and 1, unused bits 2-7 are set to 0 */
1.1.1.14 root 3037:
1.1.1.17 root 3038: if (ConfigureParams.System.nMachineType == MACHINE_ST)
3039: IoMem[0xff8260] |= 0xfc; /* On STF, set unused bits 2-7 to 1 */
1.1.1.8 root 3040: }
3041:
1.1.1.10 root 3042: /*-----------------------------------------------------------------------*/
1.1.1.11 root 3043: /**
3044: * Read horizontal scroll register (0xff8265)
3045: */
1.1.1.10 root 3046: void Video_HorScroll_Read(void)
3047: {
1.1.1.11 root 3048: IoMem[0xff8265] = HWScrollCount;
1.1.1.10 root 3049: }
1.1.1.8 root 3050:
3051: /*-----------------------------------------------------------------------*/
1.1.1.11 root 3052: /**
3053: * Write video line width register (0xff820f) - STE only.
3054: * Content of LineWidth is added to the shifter counter when display is
3055: * turned off (start of the right border, usually at cycle 376)
3056: */
1.1.1.10 root 3057: void Video_LineWidth_WriteByte(void)
3058: {
1.1.1.11 root 3059: Uint8 NewWidth;
1.1.1.15 root 3060: int FrameCycles, HblCounterVideo, LineCycles;
1.1.1.13 root 3061: int Delayed;
1.1.1.11 root 3062:
1.1.1.15 root 3063: Video_GetPosition_OnWriteAccess ( &FrameCycles , &HblCounterVideo , &LineCycles );
1.1.1.11 root 3064:
3065: NewWidth = IoMem_ReadByte(0xff820f);
3066:
3067: /* We must also check the write does not overlap the end of the line */
1.1.1.15 root 3068: if ( ( ( nHBL == HblCounterVideo ) && ( LineCycles <= ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle ) )
1.1.1.18! root 3069: || ( nHBL < nStartHBL ) || ( nHBL >= nEndHBL + BlankLines ) )
1.1.1.13 root 3070: {
1.1.1.11 root 3071: LineWidth = NewWidth; /* display is on, we can still change */
1.1.1.13 root 3072: NewLineWidth = -1; /* cancel 'pending' change */
1.1.1.15 root 3073: Delayed = false;
1.1.1.13 root 3074: }
1.1.1.11 root 3075: else
1.1.1.13 root 3076: {
1.1.1.11 root 3077: NewLineWidth = NewWidth; /* display is off, can't change LineWidth once in right border */
1.1.1.15 root 3078: Delayed = true;
1.1.1.13 root 3079: }
1.1.1.11 root 3080:
1.1.1.15 root 3081: 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 3082: NewWidth, Delayed ? "yes" : "no" ,
1.1.1.15 root 3083: FrameCycles, LineCycles, nHBL, HblCounterVideo, M68000_GetPC(), CurrentInstrCycles );
1.1.1.10 root 3084: }
3085:
3086: /*-----------------------------------------------------------------------*/
1.1.1.11 root 3087: /**
3088: * Write to video shifter palette registers (0xff8240-0xff825e)
1.1.1.14 root 3089: *
3090: * Note that there's a special "strange" case when writing only to the upper byte
3091: * of the color reg (instead of writing 16 bits at once with .W/.L).
3092: * In that case, the byte written to address x is automatically written
3093: * to address x+1 too (but we shouldn't copy x in x+1 after masking x ; we apply the mask at the end)
3094: * So : move.w #0,$ff8240 -> color 0 is now $000
3095: * move.b #7,$ff8240 -> color 0 is now $707 !
3096: * move.b #$55,$ff8241 -> color 0 is now $755 ($ff8240 remains unchanged)
3097: * move.b #$71,$ff8240 -> color 0 is now $171 (bytes are first copied, then masked)
1.1.1.11 root 3098: */
1.1.1.8 root 3099: static void Video_ColorReg_WriteWord(Uint32 addr)
3100: {
1.1.1.15 root 3101: if (!bUseHighRes && !bUseVDIRes) /* Don't store if hi-res or VDI resolution */
1.1.1.11 root 3102: {
3103: int idx;
3104: Uint16 col;
3105: Video_SetHBLPaletteMaskPointers(); /* Set 'pHBLPalettes' etc.. according cycles into frame */
3106: col = IoMem_ReadWord(addr);
1.1.1.14 root 3107:
3108: /* Handle special case when writing only to the upper byte of the color reg */
3109: if ( ( nIoMemAccessSize == SIZE_BYTE ) && ( ( IoAccessCurrentAddress & 1 ) == 0 ) )
3110: col = ( IoMem_ReadByte(addr) << 8 ) + IoMem_ReadByte(addr); /* copy upper byte into lower byte */
3111:
1.1.1.11 root 3112: if (ConfigureParams.System.nMachineType == MACHINE_ST)
3113: col &= 0x777; /* Mask off to ST 512 palette */
3114: else
3115: col &= 0xfff; /* Mask off to STe 4096 palette */
3116: IoMem_WriteWord(addr, col); /* (some games write 0xFFFF and read back to see if STe) */
3117: Spec512_StoreCyclePalette(col, addr); /* Store colour into CyclePalettes[] */
3118: idx = (addr-0xff8240)/2; /* words */
3119: pHBLPalettes[idx] = col; /* Set colour x */
3120: *pHBLPaletteMasks |= 1 << idx; /* And mask */
3121:
1.1.1.15 root 3122: if (LOG_TRACE_LEVEL(TRACE_VIDEO_COLOR))
1.1.1.11 root 3123: {
1.1.1.15 root 3124: int FrameCycles, HblCounterVideo, LineCycles;
3125:
3126: Video_GetPosition_OnWriteAccess ( &FrameCycles , &HblCounterVideo , &LineCycles );
3127:
3128: 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" ,
3129: addr, col,
3130: FrameCycles, LineCycles, nHBL, HblCounterVideo, M68000_GetPC(), CurrentInstrCycles );
1.1.1.11 root 3131: }
3132:
3133: }
1.1.1.8 root 3134: }
3135:
3136: void Video_Color0_WriteWord(void)
3137: {
1.1.1.11 root 3138: Video_ColorReg_WriteWord(0xff8240);
1.1.1.8 root 3139: }
3140:
3141: void Video_Color1_WriteWord(void)
3142: {
1.1.1.11 root 3143: Video_ColorReg_WriteWord(0xff8242);
1.1.1.8 root 3144: }
3145:
3146: void Video_Color2_WriteWord(void)
3147: {
1.1.1.11 root 3148: Video_ColorReg_WriteWord(0xff8244);
1.1.1.8 root 3149: }
3150:
3151: void Video_Color3_WriteWord(void)
3152: {
1.1.1.11 root 3153: Video_ColorReg_WriteWord(0xff8246);
1.1.1.8 root 3154: }
3155:
3156: void Video_Color4_WriteWord(void)
3157: {
1.1.1.11 root 3158: Video_ColorReg_WriteWord(0xff8248);
1.1.1.8 root 3159: }
3160:
3161: void Video_Color5_WriteWord(void)
3162: {
1.1.1.11 root 3163: Video_ColorReg_WriteWord(0xff824a);
1.1.1.8 root 3164: }
3165:
3166: void Video_Color6_WriteWord(void)
3167: {
1.1.1.11 root 3168: Video_ColorReg_WriteWord(0xff824c);
1.1.1.8 root 3169: }
3170:
3171: void Video_Color7_WriteWord(void)
3172: {
1.1.1.11 root 3173: Video_ColorReg_WriteWord(0xff824e);
1.1.1.8 root 3174: }
3175:
3176: void Video_Color8_WriteWord(void)
3177: {
1.1.1.11 root 3178: Video_ColorReg_WriteWord(0xff8250);
1.1.1.8 root 3179: }
3180:
3181: void Video_Color9_WriteWord(void)
3182: {
1.1.1.11 root 3183: Video_ColorReg_WriteWord(0xff8252);
1.1.1.8 root 3184: }
3185:
3186: void Video_Color10_WriteWord(void)
3187: {
1.1.1.11 root 3188: Video_ColorReg_WriteWord(0xff8254);
1.1.1.8 root 3189: }
3190:
3191: void Video_Color11_WriteWord(void)
3192: {
1.1.1.11 root 3193: Video_ColorReg_WriteWord(0xff8256);
1.1.1.8 root 3194: }
3195:
3196: void Video_Color12_WriteWord(void)
3197: {
1.1.1.11 root 3198: Video_ColorReg_WriteWord(0xff8258);
1.1.1.8 root 3199: }
3200:
3201: void Video_Color13_WriteWord(void)
3202: {
1.1.1.11 root 3203: Video_ColorReg_WriteWord(0xff825a);
1.1.1.8 root 3204: }
3205:
3206: void Video_Color14_WriteWord(void)
3207: {
1.1.1.11 root 3208: Video_ColorReg_WriteWord(0xff825c);
1.1.1.8 root 3209: }
3210:
3211: void Video_Color15_WriteWord(void)
3212: {
1.1.1.11 root 3213: Video_ColorReg_WriteWord(0xff825e);
1.1.1.8 root 3214: }
3215:
3216:
3217: /*-----------------------------------------------------------------------*/
1.1.1.11 root 3218: /**
3219: * Write video shifter mode register (0xff8260)
3220: */
1.1.1.8 root 3221: void Video_ShifterMode_WriteByte(void)
3222: {
1.1.1.18! root 3223: /* Don't store if VDI resolution (and don't store if hi-res?) */
! 3224: if (!bUseVDIRes /* && !bUseHighRes */)
1.1.1.11 root 3225: {
1.1.1.18! root 3226: /* We only care for lower 2-bits */
! 3227: VideoShifterByte = IoMem[0xff8260] & 3;
! 3228: /* 3 is not a valid resolution, use low res instead */
! 3229: if ( VideoShifterByte == 3 )
1.1.1.13 root 3230: {
3231: VideoShifterByte = 0;
3232: IoMem_WriteByte(0xff8260,0);
3233: }
1.1.1.18! root 3234: }
! 3235:
! 3236: if (ConfigureParams.System.nMachineType == MACHINE_FALCON)
! 3237: {
! 3238: VIDEL_ST_ShiftModeWriteByte();
! 3239: }
! 3240: else if (ConfigureParams.System.nMachineType == MACHINE_TT)
! 3241: {
! 3242: TTRes = IoMem_ReadByte(0xff8260) & 7;
! 3243: /* Copy to TT shifter mode register: */
! 3244: IoMem_WriteByte(0xff8262, TTRes);
! 3245: }
! 3246: else /* ST and STE mode */
! 3247: {
1.1.1.11 root 3248: Video_WriteToShifter(VideoShifterByte);
3249: Video_SetHBLPaletteMaskPointers();
3250: *pHBLPaletteMasks &= 0xff00ffff;
3251: /* Store resolution after palette mask and set resolution write bit: */
3252: *pHBLPaletteMasks |= (((Uint32)VideoShifterByte|0x04)<<16);
3253: }
1.1.1.10 root 3254: }
3255:
3256: /*-----------------------------------------------------------------------*/
1.1.1.11 root 3257: /**
1.1.1.13 root 3258: * Handle horizontal scrolling to the left.
3259: * On STE, there're 2 registers that can scroll the line :
3260: * - $ff8264 : scroll without prefetch
1.1.1.14 root 3261: * - $ff8265 : scroll with prefetch
1.1.1.13 root 3262: * Both registers will scroll the line to the left by skipping the amount
3263: * of pixels in $ff8264 or $ff8265 (from 0 to 15).
3264: * As some pixels will be skipped, this means the shifter needs to read
3265: * 16 other pixels in advance in some internal registers to have an uninterrupted flow of pixels.
3266: *
1.1.1.14 root 3267: * These 16 pixels can be prefetched before the display starts (on cycle 56 for example) when using
1.1.1.13 root 3268: * $ff8265 to scroll the line. In that case 8 more bytes per line (low res) will be read. Most programs
3269: * are using $ff8265 to scroll the line.
3270: *
3271: * When using $ff8264, the next 16 pixels will not be prefetched before the display
3272: * starts, they will be read when the display normally starts (cycle 56). While
3273: * reading these 16 pixels, the shifter won't be able to display anything, which will
3274: * result in 16 pixels having the color 0. So, reading the 16 pixels will in fact delay
3275: * the real start of the line, which will look as if it started 16 pixels later. As the
3276: * shifter will stop the display at cycle 56+320 anyway, this means the last 16 pixels
3277: * of each line won't be displayed and you get the equivalent of a shorter 304 pixels line.
3278: * As a consequence, this register is rarely used to scroll the line.
3279: *
3280: * By writing a value > 0 in $ff8265 (to start prefetching) and immediatly after a value of 0
3281: * in $ff8264 (no scroll and no prefetch), it's possible to fill the internal registers used
3282: * for the scrolling even if scrolling is set to 0. In that case, the shifter will start displaying
3283: * each line 16 pixels earlier (as the data are already available in the internal registers).
3284: * This allows to have 336 pixels per line (instead of 320) for all the remaining lines on the screen.
3285: *
3286: * Although some programs are using this sequence :
3287: * move.w #1,$ffff8264 ; Word access!
3288: * clr.b $ffff8264 ; Byte access!
3289: * It is also possible to add 16 pixels by doing :
3290: * move.b #X,$ff8265 ; with X > 0
3291: * move.b #0,$ff8264
1.1.1.11 root 3292: * Some games (Obsession, Skulls) and demos (Pacemaker by Paradox) use this
3293: * feature to increase the resolution, so we have to emulate this bug, too!
1.1.1.13 root 3294: *
3295: * So considering a low res line of 320 pixels (160 bytes) :
3296: * - if both $ff8264/65 are 0, no scrolling happens, the shifter reads 160 bytes and displays 320 pixels (same as STF)
3297: * - if $ff8265 > 0, line is scrolled, the shifter reads 168 bytes and displays 320 pixels.
3298: * - if $ff8264 > 0, line is scrolled, the shifter reads 160 bytes and displays 304 pixels,
3299: * the display starts 16 pixels later.
3300: * - if $ff8265 > 0 and then $ff8264 = 0, there's no scrolling, the shifter reads 168 bytes and displays 336 pixels,
3301: * the display starts 16 pixels earlier.
1.1.1.11 root 3302: */
1.1.1.13 root 3303:
3304: void Video_HorScroll_Write_8264(void)
3305: {
3306: Video_HorScroll_Write();
3307: }
3308:
3309: void Video_HorScroll_Write_8265(void)
3310: {
3311: Video_HorScroll_Write();
3312: }
3313:
1.1.1.10 root 3314: void Video_HorScroll_Write(void)
3315: {
1.1.1.13 root 3316: Uint32 RegAddr;
1.1.1.11 root 3317: Uint8 ScrollCount;
1.1.1.13 root 3318: Uint8 Prefetch;
1.1.1.15 root 3319: int FrameCycles, HblCounterVideo, LineCycles;
3320: bool Add16px = false;
1.1.1.13 root 3321: static Uint8 LastVal8265 = 0;
3322: int Delayed;
3323:
1.1.1.15 root 3324: Video_GetPosition_OnWriteAccess ( &FrameCycles , &HblCounterVideo , &LineCycles );
1.1.1.10 root 3325:
1.1.1.13 root 3326: RegAddr = IoAccessCurrentAddress; /* 0xff8264 or 0xff8265 */
3327: ScrollCount = IoMem[ RegAddr ];
1.1.1.11 root 3328: ScrollCount &= 0x0f;
1.1.1.10 root 3329:
1.1.1.13 root 3330: if ( RegAddr == 0xff8264 )
3331: {
3332: Prefetch = 0; /* scroll without prefetch */
1.1.1.15 root 3333: LastCycleScroll8264 = FrameCycles;
1.1.1.11 root 3334:
1.1.1.15 root 3335: ShifterFrame.Scroll8264Pos.VBL = nVBLs;
3336: ShifterFrame.Scroll8264Pos.FrameCycles = FrameCycles;
3337: ShifterFrame.Scroll8264Pos.HBL = HblCounterVideo;
3338: ShifterFrame.Scroll8264Pos.LineCycles = LineCycles;
3339:
3340: if ( ( ScrollCount == 0 ) && ( LastVal8265 > 0 )
3341: && ( ShifterFrame.Scroll8265Pos.VBL > 0 ) /* a write to ff8265 has been made */
3342: && ( ShifterFrame.Scroll8265Pos.VBL == ShifterFrame.Scroll8264Pos.VBL ) /* during the same VBL */
3343: && ( ShifterFrame.Scroll8264Pos.FrameCycles - ShifterFrame.Scroll8265Pos.FrameCycles <= 40 ) )
1.1.1.13 root 3344: {
1.1.1.15 root 3345: LOG_TRACE(TRACE_VIDEO_BORDER_H , "detect ste left+16 pixels\n" );
3346: Add16px = true;
1.1.1.13 root 3347: }
3348: }
3349: else
1.1.1.11 root 3350: {
1.1.1.13 root 3351: Prefetch = 1; /* scroll with prefetch */
1.1.1.15 root 3352: LastCycleScroll8265 = FrameCycles;
3353:
3354: ShifterFrame.Scroll8265Pos.VBL = nVBLs;
3355: ShifterFrame.Scroll8265Pos.FrameCycles = FrameCycles;
3356: ShifterFrame.Scroll8265Pos.HBL = HblCounterVideo;
3357: ShifterFrame.Scroll8265Pos.LineCycles = LineCycles;
3358:
1.1.1.13 root 3359: LastVal8265 = ScrollCount;
1.1.1.15 root 3360: Add16px = false;
1.1.1.11 root 3361: }
1.1.1.13 root 3362:
3363:
3364: /* If the write was made before display starts on the current line, then */
3365: /* we can still change the value now. Else, the new values will be used */
3366: /* for line n+1. */
3367: /* We must also check the write does not overlap the end of the line */
1.1.1.15 root 3368: if ( ( ( LineCycles <= LINE_START_CYCLE_50 ) && ( nHBL == HblCounterVideo ) )
1.1.1.18! root 3369: || ( nHBL < nStartHBL ) || ( nHBL >= nEndHBL + BlankLines ) )
1.1.1.11 root 3370: {
1.1.1.13 root 3371: HWScrollCount = ScrollCount; /* display has not started, we can still change */
3372: HWScrollPrefetch = Prefetch;
3373: bSteBorderFlag = Add16px;
3374: NewHWScrollCount = -1; /* cancel 'pending' change */
1.1.1.15 root 3375: Delayed = false;
1.1.1.11 root 3376: }
3377: else
3378: {
1.1.1.13 root 3379: NewHWScrollCount = ScrollCount; /* display has started, can't change HWScrollCount now */
3380: NewHWScrollPrefetch = Prefetch;
3381: if ( Add16px )
3382: NewSteBorderFlag = 1;
3383: else
3384: NewSteBorderFlag = 0;
1.1.1.15 root 3385: Delayed = true;
1.1.1.11 root 3386: }
3387:
1.1.1.15 root 3388: 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 3389: RegAddr , ScrollCount, Delayed ? "yes" : "no" ,
1.1.1.15 root 3390: FrameCycles, LineCycles, nHBL, HblCounterVideo, M68000_GetPC(), CurrentInstrCycles );
1.1.1.13 root 3391: }
1.1.1.11 root 3392:
3393: /*-----------------------------------------------------------------------*/
3394: /**
3395: * Write to TT shifter mode register (0xff8262)
3396: */
3397: void Video_TTShiftMode_WriteWord(void)
3398: {
3399: TTRes = IoMem_ReadByte(0xff8262) & 7;
3400:
3401: /*fprintf(stderr, "Write to FF8262: %x, res=%i\n", IoMem_ReadWord(0xff8262), TTRes);*/
3402:
3403: /* Is it an ST compatible resolution? */
3404: if (TTRes <= 2)
3405: {
3406: IoMem_WriteByte(0xff8260, TTRes);
3407: Video_ShifterMode_WriteByte();
3408: }
3409: }
3410:
3411: /*-----------------------------------------------------------------------*/
3412: /**
3413: * Write to TT color register (0xff8400)
3414: */
3415: void Video_TTColorRegs_WriteWord(void)
3416: {
1.1.1.15 root 3417: bTTColorsSync = false;
1.1.1.11 root 3418: }
3419:
3420: /*-----------------------------------------------------------------------*/
3421: /**
1.1.1.15 root 3422: * Write to ST color register on TT (0xff8240)
1.1.1.11 root 3423: */
3424: void Video_TTColorSTRegs_WriteWord(void)
3425: {
1.1.1.15 root 3426: bTTColorsSTSync = false;
1.1.1.8 root 3427: }
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