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1.1 root 1: /*
1.1.1.5 root 2: Hatari - video.c
3:
1.1.1.21! root 4: This file is distributed under the GNU General Public License, version 2
! 5: or at your option any later version. Read the file gpl.txt for details.
1.1 root 6:
1.1.1.7 root 7: Video hardware handling. This code handling all to do with the video chip.
8: So, we handle VBLs, HBLs, copying the ST screen to a buffer to simulate the
9: TV raster trace, border removal, palette changes per HBL, the 'video address
10: pointer' etc...
1.1 root 11: */
1.1.1.11 root 12:
13: /* 2007/03/xx [NP] Support for cycle precise border removal / hardware scrolling by using */
14: /* Cycles_GetCounterOnWriteAccess (support left/right border and lines with*/
15: /* length of +26, +2, -2, +44, -106 bytes). */
16: /* Add support for 'Enchanted Lands' second removal of right border. */
17: /* More precise support for reading video counter $ff8205/07/09. */
18: /* 2007/04/14 [NP] Precise reloading of $ff8201/03 into $ff8205/07/09 at line 310 on cycle */
19: /* RESTART_VIDEO_COUNTER_CYCLE (ULM DSOTS Demo). */
1.1.1.21! root 20: /* 2007/04/16 [NP] Better Video_CalculateAddress. We must subtract a "magic" 12 cycles to */
1.1.1.11 root 21: /* Cycles_GetCounterOnReadAccess(CYCLES_COUNTER_VIDEO) to get a correct */
1.1.1.21! root 22: /* value (No Cooper's video synchro protection is finally OK :) ). */
1.1.1.11 root 23: /* 2007/04/17 [NP] - Switch to 60 Hz to remove top border on line 33 should occur before */
24: /* LINE_REMOVE_TOP_CYCLE (a few cycles before the HBL) */
25: /* 2007/04/23 [NP] - Slight change in Video_StoreResolution to ignore hi res if the line */
26: /* has left/right border removed -> assume of lo res line. */
27: /* - Handle simultaneous removal of right border and bottom border with */
28: /* the same long switch to 60 Hz (Sync Screen in SNY II). */
29: /* 2007/05/06 [NP] More precise tests for top border's removal. */
1.1.1.15 root 30: /* 2007/05/11 [NP] Add support for med res overscan (No Cooper Greetings). */
1.1.1.11 root 31: /* 2007/05/12 [NP] - LastCycleSync50 and LastCycleSync60 for better top border's removal */
32: /* in Video_EndHBL. */
33: /* - Use VideoOffset in Video_CopyScreenLineColor to handle missing planes */
1.1.1.15 root 34: /* depending on line (med/lo and borders). */
1.1.1.11 root 35: /* 2007/09/25 [NP] Replace printf by calls to HATARI_TRACE. */
36: /* 2007/10/02 [NP] Use the new int.c to add interrupts with INT_CPU_CYCLE / INT_MFP_CYCLE. */
37: /* 2007/10/23 [NP] Add support for 0 byte line (60/50 switch at cycle 56). Allow 5 lines */
38: /* hardscroll (e.g. SHFORSTV.EXE by Paulo Simmoes). */
1.1.1.15 root 39: /* 2007/10/31 [NP] Use BORDERMASK_LEFT_OFF_MED when left border is removed with hi/med */
1.1.1.11 root 40: /* switch (ST CNX in PYM). */
41: /* 2007/11/02 [NP] Add support for 4 pixel hardware scrolling ("Let's Do The Twist" by */
42: /* ST CNX in Punish Your Machine). */
1.1.1.15 root 43: /* 2007/11/05 [NP] Depending on the position of the med res switch, the planes will be */
44: /* shifted when doing med res overscan (Best Part Of the Creation in PYM */
1.1.1.11 root 45: /* or No Cooper Greetings). */
1.1.1.15 root 46: /* 2007/11/30 [NP] A hi/med switch to remove the left border can be either used to initiate*/
47: /* a right hardware scrolling in low res (St Cnx) or a complete med res */
1.1.1.11 root 48: /* overscan line (Dragonnels Reset Part). */
49: /* Use bit 0-15, 16-19 and 20-23 in ScreenBorderMask[] to track border */
50: /* trick, STF hardware scrolling and plane shifting. */
51: /* 2007/12/22 [NP] Very precise values for VBL_VIDEO_CYCLE_OFFSET, HBL_VIDEO_CYCLE_OFFSET */
52: /* TIMERB_VIDEO_CYCLE_OFFSET and RESTART_VIDEO_COUNTER_CYCLE. These values */
53: /* were calculated using sttiming.s on a real STF and should give some very*/
54: /* accurate results (also uses 56 cycles instead of 44 to process an */
1.1.1.13 root 55: /* HBL/VBL/MFP exception). */
1.1.1.11 root 56: /* 2007/12/29 [NP] Better support for starting line 2 bytes earlier (if the line starts in */
57: /* 60 Hz and goes back to 50 Hz later), when combined with top border */
58: /* removal (Mindbomb Demo - D.I. No Shit). */
59: /* 2007/12/30 [NP] Slight improvement of VideoAdress in Video_CalculateAddress when reading*/
60: /* during the top border. */
61: /* Correct the case where removing top border on line 33 could also be */
62: /* interpreted as a right border removal (which is not possible since the */
63: /* display is still off at that point). */
64: /* 2008/01/03 [NP] Better handling of nStartHBL and nEndHBL when switching freq from */
65: /* 50 to 60 Hz. Allows emulation of a "short" 50 Hz screen of 171 lines */
66: /* and a more precise removal of bottom border in 50 and 60 Hz. */
67: /* 2008/01/04 [NP] More generic detection for removing 2 bytes to the right of the line */
68: /* when switching from 60 to 50 Hz (works even with a big number of cycles */
69: /* between the freq changes) (Phaleon's Menus). */
70: /* 2008/01/06 [NP] More generic detection for stopping the display in the middle of a line */
71: /* with a hi / lo res switch (-106 bytes per line). Although switch to */
72: /* hi res should occur at cycle 160, some demos use 164 (Phaleon's Menus). */
73: /* 2008/01/06 [NP] Better bottom border's removal in 50 Hz : switch to 60 Hz must occur */
74: /* before cycle LINE_REMOVE_BOTTOM_CYCLE on line 263 and switch back to 50 */
75: /* Hz must occur after LINE_REMOVE_BOTTOM_CYCLE on line 263 (this means */
76: /* we can already be in 50 Hz when Video_EndHBL is called and still remove */
77: /* the bottom border). This is similar to the tests used to remove the */
78: /* top border. */
79: /* 2008/01/12 [NP] In Video_SetHBLPaletteMaskPointers, consider that if a color's change */
80: /* occurs after cycle LINE_END_CYCLE_NO_RIGHT, then it's related to the */
81: /* next line. */
82: /* FIXME : it would be better to handle all color changes through spec512.c*/
83: /* and drop the 16 colors palette per line. */
84: /* FIXME : we should use Cycles_GetCounterOnWriteAccess, but it doesn't */
85: /* support multiple accesses like move.l or movem. */
86: /* 2008/01/12 [NP] Handle 60 Hz switch during the active display of the last line to remove*/
87: /* the bottom border : this should also shorten line by 2 bytes (F.N.I.L. */
88: /* Demo by TNT). */
89: /* 2008/01/15 [NP] Don't do 'left+2' if switch back to 50 Hz occurs when line is not active*/
90: /* (after cycle LINE_END_CYCLE_60) (XXX International Demos). */
91: /* 2008/01/31 [NP] Improve left border detection : allow switch to low res on cycle <= 28 */
92: /* instead of <= 20 (Vodka Demo Main Menu). */
93: /* 2008/02/02 [NP] Added 0 byte line detection when switching hi/lo res at position 28 */
94: /* (Lemmings screen in Nostalgic-o-demo). */
95: /* 2008/02/03 [NP] On STE, write to video counter $ff8205/07/09 should only be applied */
1.1.1.21! root 96: /* immediately if display has not started for the line (before cycle */
1.1.1.11 root 97: /* LINE_END_CYCLE_50). If write occurs after, the change to pVideoRaster */
98: /* should be delayed to the end of the line, after processing the current */
99: /* line with Video_CopyScreenLineColor (Stardust Tunnel Demo). */
100: /* 2008/02/04 [NP] The problem is similar when writing to hwscroll $ff8264, we must delay */
101: /* the change until the end of the line if display was already started */
102: /* (Mindrewind by Reservoir Gods). */
103: /* 2008/02/06 [NP] On STE, when left/right borders are off and hwscroll > 0, we must read */
104: /* 6 bytes less than the expected value (E605 by Light). */
105: /* 2008/02/17 [NP] In Video_CopyScreenLine, LineWidth*2 bytes should be added after */
106: /* pNewVideoRaster is copied to pVideoRaster (Braindamage Demo). */
107: /* When reading a byte at ff8205/07/09, all video address bytes should be */
108: /* updated in Video_ScreenCounter_ReadByte, not just the byte that was */
109: /* read. Fix programs that just modify one byte in the video address */
110: /* counter (e.g. sub #1,$ff8207 in Braindamage Demo). */
111: /* 2008/02/19 [NP] In Video_CalculateAddress, use pVideoRaster instead of VideoBase to */
112: /* determine the video address when display is off in the upper part of */
113: /* the screen (in case ff8205/07/09 were modified on STE). */
114: /* 2008/02/20 [NP] Better handling in Video_ScreenCounter_WriteByte by changing only one */
115: /* byte and keeping the other (Braindamage End Part). */
116: /* 2008/03/08 [NP] Use M68000_INT_VIDEO when calling M68000_Exception(). */
117: /* 2008/03/13 [NP] On STE, LineWidth value in $ff820f is added to the shifter counter just */
118: /* when display is turned off on a line (when right border is started, */
119: /* which is usually on cycle 376). */
1.1.1.21! root 120: /* This means a write to $ff820f should be applied immediately only if it */
1.1.1.11 root 121: /* occurs before cycle LineEndCycle. Else, it is stored in NewLineWidth */
122: /* and used after Video_CopyScreenLine has processed the current line */
123: /* (improve the bump mapping part in Pacemaker by Paradox). */
124: /* LineWidth should be added to pVideoRaster before checking the possible */
125: /* modification of $ff8205/07/09 in Video_CopyScreenLine. */
126: /* 2008/03/14 [NP] Rename ScanLineSkip to LineWidth (more consistent with STE docs). */
127: /* On STE, better support for writing to video counter, line width and */
128: /* hw scroll. If write to register occurs just at the start of a new line */
129: /* but before Video_EndHBL (because the move started just before cycle 512)*/
1.1.1.21! root 130: /* then the new value should not be set immediately but stored and set */
1.1.1.11 root 131: /* during Video_EndHBL (fix the bump mapping part in Pacemaker by Paradox).*/
1.1.1.12 root 132: /* 2008/03/25 [NP] On STE, when bSteBorderFlag is true, we should add 16 pixels to the left*/
133: /* border, not to the right one (Just Musix 2 Menu by DHS). */
134: /* 2008/03/26 [NP] Clear the rest of the border when using border tricks left+2, left+8 */
135: /* or right-106 (remove garbage pixels when hatari resolution changes). */
136: /* 2008/03/29 [NP] Function Video_SetSystemTimings to use different values depending on */
137: /* the machine type. On STE, top/bottom border removal can occur at cycle */
138: /* 500 instead of 504 on STF. */
1.1.1.13 root 139: /* 2008/04/02 [NP] Correct a rare case in Video_Sync_WriteByte at the end of line 33 : */
140: /* nStartHBL was set to 33 instead of 64, which gave a wrong address in */
141: /* Video_CalculateAddress. */
142: /* 2008/04/04 [NP] The value of RestartVideoCounterCycle is slightly different between */
143: /* an STF and an STE. */
144: /* 2008/04/05 [NP] The value of VblVideoCycleOffset is different of 4 cycles between */
145: /* STF and STE (fix end part in Pacemaker by Paradox). */
146: /* 2008/04/09 [NP] Preliminary support for lines using different frequencies in the same */
147: /* screen. In Video_InterruptHandler_EndLine, if the current freq is 50 Hz,*/
148: /* then next int should be scheduled in 512 cycles ; if freq is 60 Hz, */
149: /* next int should be in 508 cycles (used by timer B event count mode). */
150: /* 2008/04/10 [NP] Update LineEndCycle after changing freq to 50 or 60 Hz. */
151: /* Set EndLine interrupt to happen 28 cycles after LineEndCycle. This way */
152: /* Timer B occurs at cycle 404 in 50 Hz, or cycle 400 in 60 Hz (improve */
153: /* flickering bottom border in B.I.G. Demo screen 1). */
154: /* 2008/04/12 [NP] In the case of a 'right-2' line, we should not change the EndLine's int */
155: /* position when switching back to 50 Hz ; the int should happen at */
156: /* position LINE_END_CYCLE_60 + 28 (Anomaly Demo main menu). */
157: /* 2008/05/31 [NP] Ignore consecutives writes of the same value in the freq/res register. */
158: /* Only the 1st write matters, else this could confuse the code to remove */
159: /* top/bottom border (fix OSZI.PRG demo by ULM). */
160: /* 2008/06/07 [NP] In Video_SetHBLPaletteMaskPointers, use LineStartCycle instead of the */
161: /* 50 Hz constant SCREEN_START_CYCLE. */
162: /* Rename SCREEN_START_HBL_xxx to VIDEO_START_HBL_xxx. */
163: /* Rename SCREEN_END_HBL_xxx to VIDEO_END_HBL_xxx. */
164: /* Rename SCREEN_HEIGHT_HBL_xxx to VIDEO_HEIGHT_HBL_xxx. */
165: /* Use VIDEO_HEIGHT_BOTTOM_50HZ instead of OVERSCAN_BOTTOM. */
166: /* 2008/06/16 [NP] When Hatari is configured to display the screen's borders, 274 lines */
167: /* will be rendered on screen, but if the shifter is in 60 Hz, the last */
168: /* 16 lines will never be used, which can leave some bad pixels on */
169: /* screen. We clear the remaining lines before calling 'Screen_Draw'. */
170: /* (in FNIL by Delta Force, fix flickering gfx in the bottom border of the */
171: /* F2 screen : last 16 lines were the ones from the menu where bottom */
172: /* border was removed ). */
173: /* 2008/06/26 [NP] Improve STE scrolling : handle $ff8264 (no prefetch) and $ff8265 */
174: /* (prefetch). See Video_HorScroll_Write for details on both registers. */
175: /* More generic support for starting display 16 pixels earlier on STE */
176: /* by writing to $ff8265 and settting $ff8264=0 just after. */
177: /* (fix Digiworld 2 by ICE, which uses $ff8264 for horizontal scroll). */
178: /* 2008/07/07 [NP] Ignore other 50/60 Hz switches once the right border was removed, keep */
179: /* the timer B to occur at pos 460+28 (fix Oxygene screen in Transbeauce 2)*/
180: /* 2008/07/14 [NP] When removing only left border in 60Hz, line size is 26+158 bytes */
181: /* instead of 26+160 bytes in 50 Hz (HigResMode demo by Paradox). */
182: /* 2008/07/19 [NP] If $ff8260==3 (which is not a valid resolution mode), we use 0 instead */
183: /* (low res) (fix Omegakul screen in old Omega Demo from 1988). */
184: /* 2008/09/05 [NP] No need to test 60/50 switch if HblCounterVideo < nStartHBL (display */
185: /* has not started yet). */
186: /* 2008/09/25 [NP] Use nLastVisibleHbl to store the number of the last hbl line that should*/
187: /* be copied to the emulator's screen buffer. */
1.1.1.21! root 188: /* On STE, allow to change immediately video address, hw scroll and */
1.1.1.13 root 189: /* linewidth when nHBL>=nLastVisibleHbl instead of nHBL>=nEndHBL */
190: /* (fix Power Rise / Xtrem D demo). */
191: /* 2008/11/15 [NP] For STE registers, add in the TRACE call if the write is delayed or */
192: /* not (linewidth, hwscroll, video address). */
193: /* On STE, allow to change linewdith, hwscroll and video address with no */
194: /* delay as soon as nHBL >= nEndHBL (revert previous changes). Power Rise */
195: /* is still working due to NewHWScrollCount=-1 when setting immediate */
196: /* hwscroll. Fix regression in Braindamage. */
1.1.1.14 root 197: /* 2008/11/29 [NP] Increment jitter's index for HBL and VBL each time a possible interrupt */
198: /* occurs. Each interrupt can have a jitter between 0, 4 and 8 cycles ; the*/
199: /* jitter follows a predefined pattern of 5 values. The HBL and the VBL */
200: /* have their own pattern. See InterruptAddJitter() in uae-cpu/newcpu.c */
201: /* (fix Fullscreen tunnel in Suretrip 49% by Checkpoint and digi sound in */
202: /* Swedish New Year's TCB screen). */
203: /* 2008/12/10 [NP] Enhance support for 0 byte line. The 60/50 Hz switch can happen at */
204: /* cycles 56/64, but also at 58/66 (because access to $ff820a doesn't */
205: /* require to be on a 4 cycles boundary). As hatari doesn't handle */
206: /* multiple of 2 cycles, we allow cycles 56/64 and 60/68 (fix nosync.tos */
207: /* that uses the STOP instruction to produce a 0 byte line on the first */
208: /* displayed line (found on atari-forum.com)). */
1.1.1.17 root 209: /* 2008/12/26 [NP] When reading $ff8260 on STF, set unused bits to 1 instead of 0 */
1.1.1.14 root 210: /* (fix wrong TOS resolution in Awesome Menu Disk 16). */
211: /* Set unused bit to 1 when reading $ff820a too. */
212: /* 2009/01/16 [NP] Handle special case when writing only in upper byte of a color reg. */
213: /* 2009/01/21 [NP] Implement STE horizontal scroll for medium res (fixes cool_ste.prg). */
214: /* Take the current res into account in Video_CopyScreenLineColor to */
1.1.1.15 root 215: /* allow mixing low/med res with horizontal scroll on STE. */
216: /* 2009/01/24 [NP] Better detection of 'right-2' when freq is changed to 60 Hz and */
217: /* restored to 50 after the end of the current line (fixes games menu on */
218: /* BBC compil 10). */
219: /* 2009/01/31 [NP] Handle a rare case where 'move.b #8,$fffa1f' to start the timer B is */
220: /* done just a few cycles before the actual signal for end of line. In that*/
221: /* case we must ensure that the write was really effective before the end */
222: /* of line (else no interrupt should be made) (fix Pompey Pirate Menu #57).*/
223: /* 2009/02/08 [NP] Handle special case for simultaneous HBL exceptions (fixes flickering in*/
224: /* Monster Business and Super Monaco GP). */
225: /* 2009/02/25 [NP] Ignore other 50/60 Hz switches after display was stopped in the middle */
226: /* of the line with a hi/lo switch. Correct missing end of line timer B */
227: /* interrupt in that case (fix flickering Dragon Ball part in Blood disk 2 */
228: /* by Holocaust). */
229: /* 2008/02/02 [NP] Added 0 byte line detection in STE mode when switching hi/lo res */
230: /* at position 32 (Lemmings screen in Nostalgic-o-demo). */
231: /* 2009/03/28 [NP] Depending on bit 3 of MFP's AER, timer B will count end of line events */
232: /* (bit=0) or start of line events (bit=1) (fix Seven Gates Of Jambala). */
233: /* 2009/04/02 [NP] Add another method to obtain a 0 byte line, by switching to hi/lo res */
234: /* at position 500/508 (fix the game No Buddies Land). */
235: /* 2009/04/xx [NP] Rewrite of many parts : add SHIFTER_FRAME structure, better accuracy */
236: /* when mixing 50/60 Hz lines and reading $ff8209, better emulation of */
237: /* HBL and Timer B position when changing freq/res, better emulation of */
238: /* freq changes for top/bottom/right borders. */
239: /* 2009/07/16 [NP] In Video_SetHBLPaletteMaskPointers, if LineCycle>460 we consider the */
240: /* color's change should be applied to next line (used when spec512 mode */
241: /* if off). */
1.1.1.16 root 242: /* 2009/10/31 [NP] Depending on the overscan mode, the displayed lines must be shifted */
243: /* left or right (fix Spec 512 images in the Overscan Demos, fix pixels */
244: /* alignment in screens mixing normal lines and overscan lines). */
245: /* 2009/12/02 [NP] If we switch hi/lo around position 464 (as in Enchanted Lands) and */
246: /* right border was not removed, then we get an empty line on the next */
247: /* HBL (fix Pax Plax Parralax in Beyond by Kruz). */
248: /* 2009/12/06 [NP] Add support for STE 224 bytes overscan without stabiliser by switching */
249: /* hi/lo at cycle 504/4 to remove left border (fix More Or Less Zero and */
250: /* Cernit Trandafir by DHS, as well as Save The Earth by Defence Force). */
251: /* 2009/12/13 [NP] Improve STE 224 bytes lines : correctly set leftmost 16 pixels to color */
252: /* 0 and correct small glitches when combined with hscroll ($ff8264). */
253: /* 2009/12/13 [NP] Line scrolling caused by hi/lo switch (STF_PixelScroll) should be */
254: /* applied after STE's hardware scrolling, else in overscan 4 color 0 */
255: /* pixels will appear in the right border (because overscan shift the */
256: /* whole displayed area 4 pixels to the left) (fix possible regression on */
257: /* STE introduced on 2009/10/31). */
258: /* 2010/01/10 [NP] In Video_CalculateAddress, take bSteBorderFlag into account (+16 pixels */
259: /* in left border on STE). */
260: /* 2010/01/10 [NP] In Video_CalculateAddress, take HWScrollPrefetch into account (shifter */
261: /* starts 16 pixels earlier) (fix EPSS demo by Unit 17). */
262: /* 2010/02/05 [NP] In Video_CalculateAddress, take STE's LineWidth into account when */
263: /* display is disabled in the right border (fix flickering in Utopos). */
264: /* 2010/02/07 [NP] Better support for modifying $ff8205/07/09 while display is on */
265: /* (fix EPSS demo by Unit 17). */
266: /* 2010/04/12 [NP] Improve timings when writing to $ff8205/07/09 when hscroll is used, */
267: /* using Video_GetMMUStartCycle (fix Pacemaker's Bump Part by Paradox). */
268: /* 2010/05/02 [NP] In Video_ConvertPosition, handle the case where we read the position */
269: /* between the last HBL and the start of the next VBL. During 64 cycles */
270: /* FrameCycles can be >= CYCLES_PER_FRAME (harmless fix, only useful when */
271: /* using --trace to get correct positions in the logs). */
272: /* 2010/05/04 [NP] Improve Video_ConvertPosition, use CyclesPerVBL instead of evaluating */
273: /* CYCLES_PER_FRAME (whose value could have changed this the start of the */
274: /* VBL). */
275: /* 2010/05/15 [NP] In Video_StartInterrupts() when running in monochrome (224 cycles per */
276: /* line), the VBL could sometimes be delayed by 160 cycles (divs) and */
277: /* hbl/timer B interrupts for line 0 were not called, which could cause an */
278: /* assert/crash in Hatari when setting timer B on line 2. */
279: /* If we detect VBL was delayed too much, we add hbl/timer b in the next */
280: /* 4 cycles. */
1.1.1.17 root 281: /* 2010/07/05 [NP] When removing left border, allow up to 32 cycles between hi and low */
282: /* res switching (fix Megabeer by Invizibles). */
283: /* 2010/11/01 [NP] On STE, the 224 bytes overscan will shift the screen 8 pixels to the */
284: /* left. */
285: /* For 230 bytes overscan, handle scrolling prefetching when computing */
286: /* pVideoRaster for the next line. */
287: /* 2010/12/12 [NP] In Video_CopyScreenLineColor, use pVideoRasterEndLine to improve */
288: /* STE's horizontal scrolling for any line's length (160, 224, 230, ...). */
289: /* Fix the last 16 pixels for 224 bytes overscan (More Or Less Zero and */
290: /* Cernit Trandafir by DHS, Save The Earth by Defence Force). */
291: /* 2011/04/03 [NP] Call DmaSnd_HBL_Update() on each HBL to handle programs that modify */
292: /* the samples data while those data are played by the DMA sound. */
293: /* (fixes the game Power Up Plus and the demo Mental Hangover). */
1.1.1.18 root 294: /* 2011/07/30 [NP] Add blank line detection in STF mode when switching 60/50 Hz at cycle */
295: /* 28. The shifter will still read bytes and border removal is possible, */
296: /* but the line will be blank (we use color 0 for now, but the line should */
297: /* be black). */
298: /* (fix spectrum 512 part in Overscan Demo and shforstv by Paulo Simoes */
299: /* by removing "parasite" pixels on the 1st line). */
300: /* 2011/11/17 [NP] Improve timings used for the 0 byte line when switching hi/lo at the */
301: /* end of the line. The hi/lo switch can be at 496/508 or 500/508 */
302: /* (fix NGC screen in Delirious Demo IV). */
303: /* 2011/11/18 [NP] Add support for another method to do 4 pixel hardware scrolling by doing*/
304: /* a med/lo switch after the hi/lo switch to remove left border */
305: /* (fix NGC screen in Delirious Demo IV). */
306: /* 2011/11/19 [NP] The 0 byte line obtained by switching hi/lo at the end of the line has */
307: /* no video signal at all (blank). In that case, the screen is shifted one */
308: /* line down, and bottom border removal will happen one line later too */
309: /* (fix NGC screen in Delirious Demo IV). */
1.1.1.19 root 310: /* 2012/01/11 [NP] Don't remove left border when the hi/lo switch is made at cycle >= 12 */
311: /* (fix 'Kill The Beast 2' in the Vodka Demo) */
1.1.1.20 root 312: /* 2012/05/19 [NP] Allow bottom border to be removed when switch back to 50 Hz is made at */
313: /* cycle 504 and more (instead of 508 and more). Same for top border */
314: /* (fix 'Musical Wonders 1990' by Offbeat). */
1.1.1.21! root 315: /* 2013/03/05 [NP] An extra 4 cycle delay is added by the MFP to set IRQ when the timer B */
! 316: /* expires in event count mode. Update TIMERB_VIDEO_CYCLE_OFFSET to 24 */
! 317: /* cycles instead of 28 to compensate for this and keep the same position. */
! 318: /* 2013/04/26 [NP] Cancel changes from 2012/05/19, 'Musical Wonders 1990' is really broken */
! 319: /* on a real STF and bottom border is not removed. */
! 320: /* 2013/05/03 [NP] Add support for IACK sequence when handling HBL/VBL exceptions. Allow */
! 321: /* to handle the case where interrupt pending bit is set twice (correct */
! 322: /* fix for Super Monaco GP, Super Hang On, Monster Business, European */
! 323: /* Demo's Intro, BBC Menu 52). */
1.1.1.11 root 324:
1.1.1.12 root 325:
1.1.1.15 root 326: const char Video_fileid[] = "Hatari video.c : " __DATE__ " " __TIME__;
1.1 root 327:
1.1.1.7 root 328: #include <SDL_endian.h>
1.1.1.4 root 329:
1.1 root 330: #include "main.h"
1.1.1.6 root 331: #include "configuration.h"
1.1.1.10 root 332: #include "cycles.h"
1.1 root 333: #include "fdc.h"
1.1.1.16 root 334: #include "cycInt.h"
1.1.1.8 root 335: #include "ioMem.h"
1.1.1.4 root 336: #include "keymap.h"
1.1 root 337: #include "m68000.h"
1.1.1.21! root 338: #include "hatari-glue.h"
1.1 root 339: #include "memorySnapShot.h"
340: #include "mfp.h"
1.1.1.11 root 341: #include "printer.h"
1.1 root 342: #include "screen.h"
1.1.1.13 root 343: #include "screenSnapShot.h"
1.1 root 344: #include "shortcut.h"
345: #include "sound.h"
1.1.1.17 root 346: #include "dmaSnd.h"
1.1 root 347: #include "spec512.h"
348: #include "stMemory.h"
349: #include "vdi.h"
350: #include "video.h"
351: #include "ymFormat.h"
1.1.1.11 root 352: #include "falcon/videl.h"
353: #include "falcon/hostscreen.h"
1.1.1.16 root 354: #include "avi_record.h"
1.1.1.21! root 355: #include "ikbd.h"
1.1.1.4 root 356:
357:
1.1.1.11 root 358: /* The border's mask allows to keep track of all the border tricks */
359: /* applied to one video line. The masks for all lines are stored in the array */
360: /* ScreenBorderMask[]. */
361: /* - bits 0-15 are used to describe the border tricks. */
362: /* - bits 20-23 are used to store the bytes offset to apply for some particular */
1.1.1.15 root 363: /* tricks (for example med res overscan can shift display by 0 or 2 bytes */
364: /* depending on when the switch to med res is done after removing the left */
1.1.1.11 root 365: /* border). */
366:
1.1.1.14 root 367: #define BORDERMASK_NONE 0x00 /* no effect on this line */
1.1.1.11 root 368: #define BORDERMASK_LEFT_OFF 0x01 /* removal of left border with hi/lo res switch -> +26 bytes */
369: #define BORDERMASK_LEFT_PLUS_2 0x02 /* line starts earlier in 60 Hz -> +2 bytes */
370: #define BORDERMASK_STOP_MIDDLE 0x04 /* line ends in hires at cycle 160 -> -106 bytes */
371: #define BORDERMASK_RIGHT_MINUS_2 0x08 /* line ends earlier in 60 Hz -> -2 bytes */
372: #define BORDERMASK_RIGHT_OFF 0x10 /* removal of right border -> +44 bytes */
373: #define BORDERMASK_RIGHT_OFF_FULL 0x20 /* full removal of right border and next left border -> +22 bytes */
1.1.1.15 root 374: #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 375: #define BORDERMASK_EMPTY_LINE 0x80 /* 60/50 Hz switch prevents the line to start, video counter is not incremented */
1.1.1.15 root 376: #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 377: #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 378: #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 379:
380:
381: int STRes = ST_LOW_RES; /* current ST resolution */
382: int TTRes; /* TT shifter resolution mode */
1.1.1.13 root 383: int nFrameSkips; /* speed up by skipping video frames */
1.1.1.9 root 384:
1.1.1.13 root 385: bool bUseHighRes; /* Use hi-res (ie Mono monitor) */
1.1 root 386: int OverscanMode; /* OVERSCANMODE_xxxx for current display frame */
1.1.1.17 root 387: Uint16 HBLPalettes[HBL_PALETTE_LINES]; /* 1x16 colour palette per screen line, +1 line just incase write after line 200 */
1.1.1.8 root 388: Uint16 *pHBLPalettes; /* Pointer to current palette lists, one per HBL */
1.1.1.17 root 389: Uint32 HBLPaletteMasks[HBL_PALETTE_MASKS]; /* Bit mask of palette colours changes, top bit set is resolution change */
1.1.1.9 root 390: Uint32 *pHBLPaletteMasks;
1.1.1.15 root 391: int nScreenRefreshRate = 50; /* 50 or 60 Hz in color, 71 Hz in mono */
1.1.1.8 root 392: Uint32 VideoBase; /* Base address in ST Ram for screen (read on each VBL) */
1.1.1.9 root 393:
1.1.1.11 root 394: int nVBLs; /* VBL Counter */
395: int nHBL; /* HBL line */
396: int nStartHBL; /* Start HBL for visible screen */
397: int nEndHBL; /* End HBL for visible screen */
1.1.1.10 root 398: int nScanlinesPerFrame = 313; /* Number of scan lines per frame */
399: int nCyclesPerLine = 512; /* Cycles per horizontal line scan */
1.1.1.13 root 400: static int nFirstVisibleHbl = FIRST_VISIBLE_HBL_50HZ; /* The first line of the ST screen that is copied to the PC screen buffer */
401: 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 402: static int CyclesPerVBL = 313*512; /* Number of cycles per VBL */
1.1.1.10 root 403:
1.1.1.13 root 404: static Uint8 HWScrollCount; /* HW scroll pixel offset, STE only (0...15) */
405: static int NewHWScrollCount = -1; /* Used in STE mode when writing to the scrolling registers $ff8264/65 */
406: static Uint8 HWScrollPrefetch; /* 0 when scrolling with $ff8264, 1 when scrolling with $ff8265 */
407: static int NewHWScrollPrefetch = -1; /* Used in STE mode when writing to the scrolling registers $ff8264/65 */
408: static Uint8 LineWidth; /* Scan line width add, STe only (words, minus 1) */
409: static int NewLineWidth = -1; /* Used in STE mode when writing to the line width register $ff820f */
1.1.1.16 root 410: static int VideoCounterDelayedOffset = 0; /* Used in STE mode when changing video counter while display is on */
411: 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 412: static Uint8 *pVideoRaster; /* Pointer to Video raster, after VideoBase in PC address space. Use to copy data on HBL */
1.1.1.15 root 413: static bool bSteBorderFlag; /* true when screen width has been switched to 336 (e.g. in Obsession) */
1.1.1.13 root 414: static int NewSteBorderFlag = -1; /* New value for next line */
1.1.1.21! root 415: static bool bTTColorsSync, bTTColorsSTSync; /* whether TT colors need conversion to SDL */
! 416:
! 417: bool bTTSampleHold = false; /* TT special video mode */
! 418: static bool bTTHypermono = false; /* TT special video mode */
! 419:
! 420: static int TTSpecialVideoMode = 0; /* TT special video mode */
! 421: static int nPrevTTSpecialVideoMode = 0; /* TT special video mode */
1.1 root 422:
1.1.1.17 root 423: static int LastCycleScroll8264; /* value of Cycles_GetCounterOnWriteAccess last time ff8264 was set for the current VBL */
424: static int LastCycleScroll8265; /* value of Cycles_GetCounterOnWriteAccess last time ff8265 was set for the current VBL */
425:
426: static int LineRemoveTopCycle = LINE_REMOVE_TOP_CYCLE_STF;
427: static int LineRemoveBottomCycle = LINE_REMOVE_BOTTOM_CYCLE_STF;
428: static int RestartVideoCounterCycle = RESTART_VIDEO_COUNTER_CYCLE_STF;
429: static int VblVideoCycleOffset = VBL_VIDEO_CYCLE_OFFSET_STF;
1.1.1.13 root 430:
431: int LineTimerBCycle = LINE_END_CYCLE_50 + TIMERB_VIDEO_CYCLE_OFFSET; /* position of the Timer B interrupt on active lines */
1.1.1.15 root 432: int TimerBEventCountCycleStart = -1; /* value of Cycles_GetCounterOnWriteAccess last time timer B was started for the current VBL */
1.1 root 433:
1.1.1.20 root 434: int HblJitterIndex = 0;
435: const int HblJitterArray[] = {
436: 8,4,4,0,0 /* measured on STF */
437: };
438: const int HblJitterArrayPending[] = {
439: 4,4,4,4,4 // { 8,8,12,8,12 }; /* measured on STF, not always accurate */
440: };
441: int VblJitterIndex = 0;
442: const int VblJitterArray[] = {
443: 8,0,4,0,4 /* measured on STF */
444: };
445: const int VblJitterArrayPending[] = {
446: 8,8,12,8,12 /* not verified on STF, use the same as HBL */
447: };
1.1.1.14 root 448:
1.1.1.18 root 449: int BlankLines = 0; /* Number of empty line with no signal (by switching hi/lo near cycles 500) */
1.1.1.12 root 450:
1.1.1.15 root 451:
452: typedef struct
453: {
454: int VBL; /* VBL for this Pos (or -1 if Pos not defined for now) */
455: int FrameCycles; /* Number of cycles since this VBL */
456: int HBL; /* HBL in the VBL */
457: int LineCycles; /* cycles in the HBL */
458: } SHIFTER_POS;
459:
460:
461: typedef struct
462: {
463: int StartCycle; /* first cycle of this line, as returned by Cycles_GetCounter */
464:
465: Uint32 BorderMask; /* borders' states for this line */
466: int DisplayPixelShift; /* number of pixels to shift the whole line (<0 shift to the left, >0 shift to the right) */
467: /* On STF, this is obtained when switching hi/med for a variable number of cycles, */
468: /* but just removing left border will shift the line too. */
469:
470: int DisplayStartCycle; /* cycle where display starts for this line (0-512) : 0, 52 or 56 */
471: int DisplayEndCycle; /* cycle where display ends for this line (0-512) : 0, 160, 372, 376, 460 or 512 */
472: int DisplayBytes; /* how many bytes to display for this line */
473:
474: } SHIFTER_LINE;
475:
476:
477: typedef struct
478: {
479: int HBL_CyclePos; /* cycle position for the HBL int (depends on freq/res) */
480: int TimerB_CyclePos; /* cycle position for the Timer B int (depends on freq/res) */
481:
482: int Freq; /* value of ff820a & 2, or -1 if not set */
483: int Res; /* value of ff8260 & 3, or -1 if not set */
484: SHIFTER_POS FreqPos50; /* position of latest freq change to 50 Hz*/
485: SHIFTER_POS FreqPos60; /* position of latest freq change to 60 Hz*/
486: SHIFTER_POS ResPosLo; /* position of latest change to low res */
487: SHIFTER_POS ResPosMed; /* position of latest change to med res */
488: SHIFTER_POS ResPosHi; /* position of latest change to high res */
489:
490: SHIFTER_POS Scroll8264Pos; /* position of latest write to $ff8264 */
491: SHIFTER_POS Scroll8265Pos; /* position of latest write to $ff8265 */
492:
493: SHIFTER_LINE ShifterLines[ MAX_SCANLINES_PER_FRAME ];
494: } SHIFTER_FRAME;
495:
496:
497: SHIFTER_FRAME ShifterFrame;
498:
499:
500:
501: /*--------------------------------------------------------------*/
502: /* Local functions prototypes */
503: /*--------------------------------------------------------------*/
504:
505: static void Video_SetSystemTimings ( void );
506:
507: static Uint32 Video_CalculateAddress ( void );
1.1.1.16 root 508: static int Video_GetMMUStartCycle ( int DisplayStartCycle );
1.1.1.15 root 509: static void Video_WriteToShifter ( Uint8 Res );
510: static void Video_Sync_SetDefaultStartEnd ( Uint8 Freq , int HblCounterVideo , int LineCycles );
511:
512: static int Video_HBL_GetPos ( void );
1.1.1.18 root 513: static int Video_TimerB_GetDefaultPos ( void );
1.1.1.15 root 514: static void Video_EndHBL ( void );
515: static void Video_StartHBL ( void );
516:
517: static void Video_StoreFirstLinePalette(void);
518: static void Video_StoreResolution(int y);
519: static void Video_CopyScreenLineMono(void);
520: static void Video_CopyScreenLineColor(void);
521: static void Video_CopyVDIScreen(void);
522: static void Video_SetHBLPaletteMaskPointers(void);
523:
524: static void Video_UpdateTTPalette(int bpp);
525: static void Video_DrawScreen(void);
526:
527: static void Video_ResetShifterTimings(void);
528: static void Video_InitShifterLines(void);
529: static void Video_ClearOnVBL(void);
530:
531: static void Video_AddInterrupt ( int Pos , interrupt_id Handler );
532: static void Video_AddInterruptHBL ( int Pos );
533:
534: static void Video_ColorReg_WriteWord(Uint32 addr);
535:
536:
1.1 root 537: /*-----------------------------------------------------------------------*/
1.1.1.11 root 538: /**
539: * Save/Restore snapshot of local variables('MemorySnapShot_Store' handles type)
540: */
1.1.1.13 root 541: void Video_MemorySnapShot_Capture(bool bSave)
1.1 root 542: {
1.1.1.11 root 543: /* Save/Restore details */
544: MemorySnapShot_Store(&TTRes, sizeof(TTRes));
545: MemorySnapShot_Store(&bUseHighRes, sizeof(bUseHighRes));
546: MemorySnapShot_Store(&nVBLs, sizeof(nVBLs));
547: MemorySnapShot_Store(&nHBL, sizeof(nHBL));
548: MemorySnapShot_Store(&nStartHBL, sizeof(nStartHBL));
549: MemorySnapShot_Store(&nEndHBL, sizeof(nEndHBL));
550: MemorySnapShot_Store(&OverscanMode, sizeof(OverscanMode));
551: MemorySnapShot_Store(HBLPalettes, sizeof(HBLPalettes));
552: MemorySnapShot_Store(HBLPaletteMasks, sizeof(HBLPaletteMasks));
553: MemorySnapShot_Store(&VideoBase, sizeof(VideoBase));
554: MemorySnapShot_Store(&LineWidth, sizeof(LineWidth));
555: MemorySnapShot_Store(&HWScrollCount, sizeof(HWScrollCount));
556: MemorySnapShot_Store(&pVideoRaster, sizeof(pVideoRaster));
557: MemorySnapShot_Store(&nScanlinesPerFrame, sizeof(nScanlinesPerFrame));
558: MemorySnapShot_Store(&nCyclesPerLine, sizeof(nCyclesPerLine));
559: MemorySnapShot_Store(&nFirstVisibleHbl, sizeof(nFirstVisibleHbl));
560: MemorySnapShot_Store(&bSteBorderFlag, sizeof(bSteBorderFlag));
1.1.1.14 root 561: MemorySnapShot_Store(&HblJitterIndex, sizeof(HblJitterIndex));
562: MemorySnapShot_Store(&VblJitterIndex, sizeof(VblJitterIndex));
1.1.1.15 root 563: MemorySnapShot_Store(&ShifterFrame, sizeof(ShifterFrame));
1.1.1.21! root 564: MemorySnapShot_Store(&bTTSampleHold, sizeof(bTTSampleHold));
! 565: MemorySnapShot_Store(&bTTHypermono, sizeof(bTTHypermono));
! 566: MemorySnapShot_Store(&TTSpecialVideoMode, sizeof(TTSpecialVideoMode));
1.1.1.15 root 567: }
568:
569:
570: /*-----------------------------------------------------------------------*/
571: /**
572: * Reset video chip
573: */
574: void Video_Reset(void)
575: {
576: /* NOTE! Must reset all of these register type things here!!!! */
1.1.1.19 root 577: Video_Reset_Glue();
1.1.1.15 root 578:
579: /* Set system specific timings */
580: Video_SetSystemTimings();
581:
582: /* Reset VBL counter */
583: nVBLs = 0;
584: /* Reset addresses */
585: VideoBase = 0L;
586:
587: /* Reset shifter's state variables */
588: ShifterFrame.Freq = -1;
589: ShifterFrame.Res = -1;
590: ShifterFrame.FreqPos50.VBL = -1;
591: ShifterFrame.FreqPos60.VBL = -1;
592: ShifterFrame.ResPosLo.VBL = -1;
593: ShifterFrame.ResPosMed.VBL = -1;
594: ShifterFrame.ResPosHi.VBL = -1;
595: ShifterFrame.Scroll8264Pos.VBL = -1;
596: ShifterFrame.Scroll8265Pos.VBL = -1;
597:
598: Video_InitShifterLines ();
599:
600: /* Reset STE screen variables */
601: LineWidth = 0;
602: HWScrollCount = 0;
603: bSteBorderFlag = false;
604:
605: NewLineWidth = -1; /* cancel pending modifications set before the reset */
606: NewHWScrollCount = -1;
607:
1.1.1.16 root 608: VideoCounterDelayedOffset = 0;
609: pVideoRasterDelayed = NULL;
610:
1.1.1.15 root 611: /* Reset jitter indexes */
612: HblJitterIndex = 0;
613: VblJitterIndex = 0;
614:
615: /* Clear framecycles counter */
616: Cycles_SetCounter(CYCLES_COUNTER_VIDEO, 0);
617:
618: /* Clear ready for new VBL */
619: Video_ClearOnVBL();
620: }
621:
622:
623: /*-----------------------------------------------------------------------*/
624: /**
625: * Reset the GLUE chip responsible for generating the H/V sync signals.
626: * When the 68000 RESET instruction is called, frequency and resolution
627: * should be reset to 0.
628: */
629: void Video_Reset_Glue(void)
630: {
1.1.1.20 root 631: Uint8 VideoShifterByte;
632:
1.1.1.19 root 633: IoMem_WriteByte(0xff820a,0); /* Video frequency */
634:
635: /* Are we in high-res? */
636: if (bUseHighRes)
637: VideoShifterByte = ST_HIGH_RES; /* Mono monitor */
638: else
639: VideoShifterByte = ST_LOW_RES;
640: if (bUseVDIRes)
641: VideoShifterByte = VDIRes;
642:
643: IoMem_WriteByte(0xff8260, VideoShifterByte);
1.1 root 644: }
645:
1.1.1.8 root 646:
1.1 root 647: /*-----------------------------------------------------------------------*/
1.1.1.12 root 648: /*
649: * Set specific video timings, depending on the system being emulated.
650: */
1.1.1.15 root 651: static void Video_SetSystemTimings(void)
1.1.1.12 root 652: {
1.1.1.19 root 653: if ( ConfigureParams.System.nMachineType == MACHINE_ST )
654: {
655: LineRemoveTopCycle = LINE_REMOVE_TOP_CYCLE_STF;
656: LineRemoveBottomCycle = LINE_REMOVE_BOTTOM_CYCLE_STF;
657: RestartVideoCounterCycle = RESTART_VIDEO_COUNTER_CYCLE_STF;
658: VblVideoCycleOffset = VBL_VIDEO_CYCLE_OFFSET_STF;
659: }
1.1.1.20 root 660: else /* STE, TT */
1.1.1.19 root 661: {
662: LineRemoveTopCycle = LINE_REMOVE_TOP_CYCLE_STE;
663: LineRemoveBottomCycle = LINE_REMOVE_BOTTOM_CYCLE_STE;
664: RestartVideoCounterCycle = RESTART_VIDEO_COUNTER_CYCLE_STE;
665: VblVideoCycleOffset = VBL_VIDEO_CYCLE_OFFSET_STE;
666: }
1.1.1.12 root 667: }
668:
669:
670: /*-----------------------------------------------------------------------*/
1.1.1.11 root 671: /**
1.1.1.15 root 672: * Convert the elapsed number of cycles since the start of the VBL
673: * into the corresponding HBL number and the cycle position in the current
674: * HBL. We use the starting cycle position of the closest HBL to compute
675: * the cycle position on the line (this allows to mix lines with different
676: * values for nCyclesPerLine).
677: * We can have 2 cases on the limit where the real video line count can be
678: * different from nHBL :
679: * - when reading video address between cycle 0 and 12, LineCycle will be <0,
680: * so we need to use the data from line nHBL-1
681: * - if LineCycle >= nCyclesPerLine, this means the HBL int was not processed
682: * yet, so the video line number is in fact nHBL+1
683: */
684:
685: void Video_ConvertPosition ( int FrameCycles , int *pHBL , int *pLineCycles )
686: {
1.1.1.16 root 687: if ( 0 && FrameCycles >= CyclesPerVBL ) /* rare case between end of last hbl and start of next VBL (during 64 cycles) */
1.1.1.15 root 688: {
1.1.1.16 root 689: *pHBL = ( FrameCycles - CyclesPerVBL ) / nCyclesPerLine;
690: *pLineCycles = ( FrameCycles - CyclesPerVBL ) % nCyclesPerLine;
691: //fprintf ( stderr , "out of vbl FrameCycles %d CyclesPerVBL %d nHBL=%d %d %d\n" , FrameCycles , CyclesPerVBL, nHBL , *pHBL , *pLineCycles );
1.1.1.15 root 692: }
1.1.1.16 root 693:
694: else /* most common case */
1.1.1.15 root 695: {
1.1.1.16 root 696: *pHBL = nHBL;
697: *pLineCycles = FrameCycles - ShifterFrame.ShifterLines[ nHBL ].StartCycle;
1.1.1.15 root 698:
1.1.1.16 root 699: if ( *pLineCycles < 0 ) /* reading from the previous video line */
700: {
701: *pHBL = nHBL-1;
702: *pLineCycles = FrameCycles - ShifterFrame.ShifterLines[ nHBL-1 ].StartCycle;
703: }
704:
705: else if ( *pLineCycles >= nCyclesPerLine ) /* reading on the next line, but HBL int was delayed */
706: {
707: *pHBL = nHBL+1;
708: *pLineCycles -= nCyclesPerLine;
709: }
710: }
1.1.1.15 root 711:
712: if ( *pLineCycles < 0 )
713: fprintf ( stderr , "bug nHBL=%d %d %d\n" , nHBL , *pHBL , *pLineCycles );
714:
715: //if ( ( *pHBL != FrameCycles / nCyclesPerLine ) || ( *pLineCycles != FrameCycles % nCyclesPerLine ) )
716: // LOG_TRACE ( TRACE_VIDEO_ADDR , "conv pos %d %d - %d %d\n" , *pHBL , FrameCycles / nCyclesPerLine , *pLineCycles , FrameCycles % nCyclesPerLine );
717: // LOG_TRACE ( TRACE_VIDEO_ADDR , "conv pos %d %d %d\n" , FrameCycles , *pHBL , *pLineCycles );
718: }
719:
720:
721: void Video_GetPosition ( int *pFrameCycles , int *pHBL , int *pLineCycles )
722: {
723: *pFrameCycles = Cycles_GetCounter(CYCLES_COUNTER_VIDEO);
724: Video_ConvertPosition ( *pFrameCycles , pHBL , pLineCycles );
725: }
726:
727:
728: void Video_GetPosition_OnWriteAccess ( int *pFrameCycles , int *pHBL , int *pLineCycles )
729: {
730: *pFrameCycles = Cycles_GetCounterOnWriteAccess(CYCLES_COUNTER_VIDEO);
731: Video_ConvertPosition ( *pFrameCycles , pHBL , pLineCycles );
732: }
733:
734:
735: void Video_GetPosition_OnReadAccess ( int *pFrameCycles , int *pHBL , int *pLineCycles )
736: {
737: *pFrameCycles = Cycles_GetCounterOnReadAccess(CYCLES_COUNTER_VIDEO);
738: Video_ConvertPosition ( *pFrameCycles , pHBL , pLineCycles );
739: }
740:
741:
742: /*-----------------------------------------------------------------------*/
743: /**
1.1.1.11 root 744: * Calculate and return video address pointer.
745: */
1.1.1.15 root 746: static Uint32 Video_CalculateAddress ( void )
1.1 root 747: {
1.1.1.15 root 748: int FrameCycles, HblCounterVideo, LineCycles;
749: int X, NbBytes;
1.1.1.11 root 750: Uint32 VideoAddress; /* Address of video display in ST screen space */
751: int nSyncByte;
752: int LineBorderMask;
753: int PrevSize;
754: int CurSize;
1.1.1.15 root 755: int LineStartCycle , LineEndCycle;
1.1.1.11 root 756:
757: /* Find number of cycles passed during frame */
1.1.1.21! root 758: /* We need to subtract '12' for correct video address calculation */
1.1.1.15 root 759: FrameCycles = Cycles_GetCounterOnReadAccess(CYCLES_COUNTER_VIDEO) - 12;
1.1.1.11 root 760:
761: /* Now find which pixel we are on (ignore left/right borders) */
1.1.1.15 root 762: Video_ConvertPosition ( FrameCycles , &HblCounterVideo , &LineCycles );
763: X = LineCycles;
1.1.1.11 root 764:
765: nSyncByte = IoMem_ReadByte(0xff820a) & 2; /* only keep bit 1 */
766: if (nSyncByte) /* 50 Hz */
767: {
768: LineStartCycle = LINE_START_CYCLE_50;
769: LineEndCycle = LINE_END_CYCLE_50;
770: }
771: else /* 60 Hz */
772: {
773: LineStartCycle = LINE_START_CYCLE_60;
774: LineEndCycle = LINE_END_CYCLE_60;
775: }
776:
777:
778: /* Top of screen is usually 63 lines from VBL in 50 Hz */
1.1.1.15 root 779: if ( HblCounterVideo < nStartHBL )
1.1.1.11 root 780: {
781: /* pVideoRaster was set during Video_ClearOnVBL using VideoBase */
782: /* and it could also have been modified on STE by writing to ff8205/07/09 */
1.1.1.15 root 783: /* So, we should not use ff8201/ff8203 which are reloaded in ff8205/ff8207 only once per VBL */
784: /* but use pVideoRaster - STRam instead to get current shifter video address */
1.1.1.11 root 785: VideoAddress = pVideoRaster - STRam;
786: }
787:
1.1.1.15 root 788: else if (FrameCycles > RestartVideoCounterCycle)
1.1.1.11 root 789: {
790: /* This is where ff8205/ff8207 are reloaded with the content of ff8201/ff8203 on a real ST */
791: /* (used in ULM DSOTS demos). VideoBase is also reloaded in Video_ClearOnVBL to be sure */
792: VideoBase = (Uint32)IoMem_ReadByte(0xff8201)<<16 | (Uint32)IoMem_ReadByte(0xff8203)<<8;
793: if (ConfigureParams.System.nMachineType != MACHINE_ST)
794: {
1.1.1.20 root 795: /* on STe 2 aligned, on TT 8 aligned. We do STe. */
1.1.1.11 root 796: VideoBase |= IoMem_ReadByte(0xff820d) & ~1;
797: }
798:
799: VideoAddress = VideoBase;
800: }
801:
802: else
803: {
804: VideoAddress = pVideoRaster - STRam; /* pVideoRaster is updated by Video_CopyScreenLineColor */
805:
806: /* Now find which pixel we are on (ignore left/right borders) */
1.1.1.15 root 807: // X = ( Cycles_GetCounterOnReadAccess(CYCLES_COUNTER_VIDEO) - 12 ) % nCyclesPerLine;
1.1.1.11 root 808:
809: /* Get real video line count (can be different from nHBL) */
1.1.1.15 root 810: // HblCounterVideo = ( Cycles_GetCounterOnReadAccess(CYCLES_COUNTER_VIDEO) - 12 ) / nCyclesPerLine;
1.1.1.11 root 811:
812: /* Correct the case when read overlaps end of line / start of next line */
813: /* Video_CopyScreenLineColor was not called yet to update VideoAddress */
814: /* so we need to determine the size of the previous line to get the */
815: /* correct value of VideoAddress. */
816: PrevSize = 0;
817: if ( HblCounterVideo < nHBL )
818: X = 0;
819: else if ( ( HblCounterVideo > nHBL ) /* HblCounterVideo = nHBL+1 */
820: && ( nHBL >= nStartHBL ) ) /* if nHBL was not visible, PrevSize = 0 */
821: {
1.1.1.15 root 822: LineBorderMask = ShifterFrame.ShifterLines[ HblCounterVideo-1 ].BorderMask; /* get border mask for nHBL */
1.1.1.11 root 823: PrevSize = BORDERBYTES_NORMAL; /* normal line */
824:
825: if (LineBorderMask & BORDERMASK_LEFT_OFF)
826: PrevSize += BORDERBYTES_LEFT;
827: else if (LineBorderMask & BORDERMASK_LEFT_PLUS_2)
828: PrevSize += 2;
829:
830: if (LineBorderMask & BORDERMASK_STOP_MIDDLE)
831: PrevSize -= 106;
832: else if (LineBorderMask & BORDERMASK_RIGHT_MINUS_2)
833: PrevSize -= 2;
834: else if (LineBorderMask & BORDERMASK_RIGHT_OFF)
835: PrevSize += BORDERBYTES_RIGHT;
836:
837: if (LineBorderMask & BORDERMASK_EMPTY_LINE)
838: PrevSize = 0;
839: }
840:
841:
1.1.1.15 root 842: LineBorderMask = ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask;
1.1.1.11 root 843:
844: CurSize = BORDERBYTES_NORMAL; /* normal line */
845:
846: if (LineBorderMask & BORDERMASK_LEFT_OFF)
847: CurSize += BORDERBYTES_LEFT;
848: else if (LineBorderMask & BORDERMASK_LEFT_PLUS_2)
849: CurSize += 2;
1.1.1.16 root 850: else if (bSteBorderFlag) /* bigger line by 8 bytes on the left (STE specific) */
851: CurSize += 8;
852: else if ( ( HWScrollCount > 0 ) && ( HWScrollPrefetch == 1 ) )
853: CurSize += 8; /* 8 more bytes are loaded when scrolling with prefetching */
1.1.1.11 root 854:
855: if (LineBorderMask & BORDERMASK_STOP_MIDDLE)
856: CurSize -= 106;
857: else if (LineBorderMask & BORDERMASK_RIGHT_MINUS_2)
858: CurSize -= 2;
859: else if (LineBorderMask & BORDERMASK_RIGHT_OFF)
860: CurSize += BORDERBYTES_RIGHT;
861: if (LineBorderMask & BORDERMASK_RIGHT_OFF_FULL)
862: CurSize += BORDERBYTES_RIGHT_FULL;
863:
864: if ( LineBorderMask & BORDERMASK_LEFT_PLUS_2)
865: LineStartCycle = LINE_START_CYCLE_60;
866: else if ( LineBorderMask & BORDERMASK_LEFT_OFF )
1.1.1.15 root 867: LineStartCycle = LINE_START_CYCLE_71;
1.1.1.16 root 868: else if ( bSteBorderFlag )
869: LineStartCycle -= 16; /* display starts 16 pixels earlier */
870: else if ( ( HWScrollCount > 0 ) && ( HWScrollPrefetch == 1 ) )
871: LineStartCycle -= 16; /* shifter starts reading 16 pixels earlier when scrolling with prefetching */
1.1.1.11 root 872:
873: LineEndCycle = LineStartCycle + CurSize*2;
874:
875:
876: if ( X < LineStartCycle )
1.1.1.16 root 877: X = LineStartCycle; /* display is disabled in the left border */
1.1.1.11 root 878: else if ( X > LineEndCycle )
1.1.1.16 root 879: {
880: X = LineEndCycle; /* display is disabled in the right border */
881: /* On STE, the Shifter skips the given amount of words as soon as display is disabled */
882: /* (LineWidth is 0 on STF */
883: VideoAddress += LineWidth*2;
884: }
1.1.1.11 root 885:
886: NbBytes = ( (X-LineStartCycle)>>1 ) & (~1); /* 2 cycles per byte */
887:
888:
889: /* when left border is open, we have 2 bytes less than theorical value */
890: /* (26 bytes in left border, which is not a multiple of 4 cycles) */
891: if ( LineBorderMask & BORDERMASK_LEFT_OFF )
892: NbBytes -= 2;
893:
894: if ( LineBorderMask & BORDERMASK_EMPTY_LINE )
895: NbBytes = 0;
896:
1.1.1.16 root 897: /* Add line cycles if we have not reached end of screen yet */
1.1.1.18 root 898: if ( HblCounterVideo < nEndHBL + BlankLines )
1.1.1.11 root 899: VideoAddress += PrevSize + NbBytes;
900: }
901:
1.1.1.16 root 902: LOG_TRACE(TRACE_VIDEO_ADDR , "video base=%x raster=%x addr=%x video_cyc=%d "
903: "line_cyc=%d/X=%d @ nHBL=%d/video_hbl=%d %d<->%d pc=%x instr_cyc=%d\n",
904: VideoBase, (int)(pVideoRaster - STRam), VideoAddress,
905: Cycles_GetCounter(CYCLES_COUNTER_VIDEO), LineCycles, X, nHBL,
906: HblCounterVideo, LineStartCycle, LineEndCycle, M68000_GetPC(), CurrentInstrCycles);
1.1.1.11 root 907:
908: return VideoAddress;
909: }
910:
911:
912: /*-----------------------------------------------------------------------*/
913: /**
1.1.1.16 root 914: * Calculate the cycle where the STF/STE's MMU starts reading
915: * data to send them to the shifter.
916: * On STE, if hscroll is used, prefetch will cause this position to
917: * happen 16 cycles earlier.
918: * This function should use the same logic as in Video_CalculateAddress.
919: * NOTE : this function is not completly accurate, as even when there's
920: * no hscroll (on STF) the mmu starts reading 16 cycles before display starts.
921: * But it's good enough to emulate writing to ff8205/07/09 on STE.
922: */
923: static int Video_GetMMUStartCycle ( int DisplayStartCycle )
924: {
925: if ( bSteBorderFlag )
926: DisplayStartCycle -= 16; /* display starts 16 pixels earlier */
927: else if ( ( HWScrollCount > 0 ) && ( HWScrollPrefetch == 1 ) )
928: DisplayStartCycle -= 16; /* shifter starts reading 16 pixels earlier when scrolling with prefetching */
929:
930: return DisplayStartCycle;
931: }
932:
933:
934: /*-----------------------------------------------------------------------*/
935: /**
1.1.1.11 root 936: * Write to VideoShifter (0xff8260), resolution bits
937: */
1.1.1.15 root 938: static void Video_WriteToShifter ( Uint8 Res )
1.1 root 939: {
1.1.1.15 root 940: int FrameCycles, HblCounterVideo, LineCycles;
1.1.1.11 root 941:
1.1.1.15 root 942: Video_GetPosition_OnWriteAccess ( &FrameCycles , &HblCounterVideo , &LineCycles );
1.1.1.11 root 943:
1.1.1.15 root 944: 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",
945: Res, FrameCycles, LineCycles, nHBL, HblCounterVideo, M68000_GetPC(), CurrentInstrCycles );
1.1.1.11 root 946:
947:
1.1.1.13 root 948: /* Ignore consecutive writes of the same value */
1.1.1.15 root 949: if ( Res == ShifterFrame.Res )
1.1.1.13 root 950: return; /* do nothing */
951:
1.1.1.15 root 952:
953: if ( Res == 0x02 ) /* switch to high res */
954: {
955: if ( LineCycles < ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle ) /* start could be 0,52,56 */
956: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle = LINE_START_CYCLE_71;
957:
958: if ( ( LineCycles < ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle ) /* end could be 160,372,376,460 */
959: && ( LineCycles < LINE_END_CYCLE_71 ) )
960: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle = LINE_END_CYCLE_71;
961: }
962: else /* switch to lo/med res */
963: {
964: /* In lo/med res, display start/end depends on the freq register in $ff820a */
965: Video_Sync_SetDefaultStartEnd ( IoMem[0xff820a] & 2 , HblCounterVideo , LineCycles );
966: }
967:
968:
1.1.1.11 root 969: /* Remove left border : +26 bytes */
1.1.1.15 root 970: /* This can be done with a hi/lo res switch or a hi/med res switch */
971: if ( ( ShifterFrame.Res == 0x02 ) && ( Res == 0x00 ) /* switched from hi res to lo res */
1.1.1.16 root 972: // && ( LineCycles >= 12 ) /* switch back to low res should be after cycle 8 */
1.1.1.19 root 973: && ( ( ShifterFrame.ResPosHi.LineCycles < 12 ) || ( ShifterFrame.ResPosHi.LineCycles >= 504 ) ) /* switch to hi between 504 and 8 */
1.1.1.15 root 974: && ( LineCycles <= (LINE_START_CYCLE_71+28) )
1.1.1.17 root 975: && ( FrameCycles - ShifterFrame.ResPosHi.FrameCycles <= 32 ) )
1.1.1.15 root 976: {
1.1.1.20 root 977: if ( ( ( ConfigureParams.System.nMachineType == MACHINE_STE ) /* special case for 504/4 and 508/4 on STE -> add 20 bytes to left border */
1.1.1.17 root 978: || ( ConfigureParams.System.nMachineType == MACHINE_MEGA_STE ) )
1.1.1.20 root 979: && ( ( ( ShifterFrame.ResPosHi.LineCycles == 504 ) && ( LineCycles == 4 ) )
980: || ( ( ShifterFrame.ResPosHi.LineCycles == 508 ) && ( LineCycles == 4 ) ) ) )
1.1.1.16 root 981: {
982: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_LEFT_OFF_2_STE;
983: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle = LINE_START_CYCLE_71+16; /* starts 16 pixels later */
1.1.1.17 root 984: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayPixelShift = -8; /* screen is shifted 8 pixels to the left */
1.1.1.16 root 985: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect remove left 2 ste %d<->%d\n" ,
986: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
987: }
988: else /* other case for STF/STE -> add 26 bytes */
989: {
990: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_LEFT_OFF;
991: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle = LINE_START_CYCLE_71;
992: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayPixelShift = -4; /* screen is shifted 4 pixels to the left */
993: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect remove left %d<->%d\n" ,
994: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
995: }
1.1.1.15 root 996: }
997:
998: if ( ( ShifterFrame.Res == 0x02 ) && ( Res == 0x01 ) /* switched from hi res to med res */
999: && ( LineCycles <= (LINE_START_CYCLE_71+20) )
1000: && ( FrameCycles - ShifterFrame.ResPosHi.FrameCycles <= 30 ) )
1001: {
1002: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_LEFT_OFF_MED; /* a later switch to low res might gives right scrolling */
1003: /* By default, this line will be in med res, except if we detect hardware scrolling later */
1004: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_OVERSCAN_MED_RES | ( 2 << 20 );
1005: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle = LINE_START_CYCLE_71;
1006: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect remove left med %d<->%d\n" ,
1007: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
1008: }
1009:
1010: /* Empty line switching res on STF : switch to hi res on cycle 28, then go back to med/lo res */
1011: /* This creates a 0 byte line, the video counter won't change for this line */
1012: else if ( ( ShifterFrame.Res == 0x02 ) /* switched from hi res */
1013: && ( FrameCycles - ShifterFrame.ResPosHi.FrameCycles <= 16 )
1014: && ( ShifterFrame.ResPosHi.LineCycles == LINE_EMPTY_CYCLE_71_STF )
1015: && ( ConfigureParams.System.nMachineType == MACHINE_ST ) )
1016: {
1017: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_EMPTY_LINE;
1018: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle = 0;
1019: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle = 0;
1020: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect empty line res %d<->%d\n" ,
1021: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
1022: }
1023:
1024: /* Empty line switching res on STE (switch is 4 cycles later than on STF) */
1025: else if ( ( ShifterFrame.Res == 0x02 ) /* switched from hi res */
1026: && ( FrameCycles - ShifterFrame.ResPosHi.FrameCycles <= 16 )
1027: && ( ShifterFrame.ResPosHi.LineCycles == LINE_EMPTY_CYCLE_71_STE )
1.1.1.17 root 1028: && ( ( ConfigureParams.System.nMachineType == MACHINE_STE )
1029: || ( ConfigureParams.System.nMachineType == MACHINE_MEGA_STE ) ) )
1.1.1.15 root 1030: {
1031: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_EMPTY_LINE;
1032: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle = 0;
1033: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle = 0;
1034: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect empty line res %d<->%d\n" ,
1035: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
1036: }
1037:
1038: /* Empty line switching res on STF : switch to hi res just before the HBL then go back to lo/med res */
1.1.1.19 root 1039: /* Next HBL will be an empty line (used in 'No Buddies Land' and 'Delirious Demo IV / NGC') */
1.1.1.15 root 1040: else if ( ( ShifterFrame.Res == 0x02 ) /* switched from hi res */
1.1.1.18 root 1041: && ( ( ShifterFrame.ResPosHi.LineCycles == 500-4 ) || ( ShifterFrame.ResPosHi.LineCycles == 500 ) )
1.1.1.15 root 1042: && ( LineCycles == 508 ) )
1043: {
1.1.1.16 root 1044: ShifterFrame.ShifterLines[ HblCounterVideo+1 ].BorderMask |= BORDERMASK_EMPTY_LINE;
1045: ShifterFrame.ShifterLines[ HblCounterVideo+1 ].DisplayStartCycle = 0;
1046: ShifterFrame.ShifterLines[ HblCounterVideo+1 ].DisplayEndCycle = 0;
1.1.1.18 root 1047: BlankLines++; /* no video signal at all for this line */
1.1.1.16 root 1048: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect empty line res 2 %d<->%d for nHBL=%d\n" ,
1049: ShifterFrame.ShifterLines[ HblCounterVideo+1 ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo+1 ].DisplayEndCycle , nHBL+1 );
1.1.1.15 root 1050: }
1051:
1052: /* Start right border near middle of the line : -106 bytes */
1053: /* Switch to hi res just before the start of the right border in hi res, then go back to lo/mid res */
1054: if ( ( ShifterFrame.Res == 0x02 ) /* switched from hi res */
1055: && ( ShifterFrame.ResPosHi.HBL == HblCounterVideo ) /* switch during the same line */
1056: && ( ShifterFrame.ResPosHi.LineCycles <= LINE_END_CYCLE_71+4 ) /* switched to hi res before cycle 164 */
1057: && ( LineCycles >= LINE_END_CYCLE_71+4 ) ) /* switch to lo res after cycle 164 */
1058: {
1059: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_STOP_MIDDLE;
1060: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle = LINE_END_CYCLE_71;
1061: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect stop middle %d<->%d\n" ,
1062: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
1063: }
1064:
1065: /* Remove right border a second time after removing it a first time. Display will */
1066: /* stop at cycle 512 instead of 460. */
1067: /* This removes left border on next line too (used in 'Enchanted Lands') */
1.1.1.16 root 1068: /* If right border was not removed, then we will get an empty line for the next HBL (used in Beyond by Kruz) */
1069: if ( ( ShifterFrame.Res == 0x02 ) /* switched from hi res */
1070: && ( LineCycles > LINE_END_CYCLE_50_2 ) /* switch to low just after end of right border */
1071: && ( ShifterFrame.ResPosHi.LineCycles <= LINE_END_CYCLE_50_2 ) /* switch to hi just before end of right border */
1072: && ( FrameCycles - ShifterFrame.ResPosHi.FrameCycles <= 20 ) )
1073: {
1074: if ( ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask & BORDERMASK_RIGHT_OFF ) /* Enchanted Lands */
1075: {
1076: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_RIGHT_OFF_FULL;
1077: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle = LINE_END_CYCLE_FULL;
1078: ShifterFrame.ShifterLines[ HblCounterVideo+1 ].BorderMask |= BORDERMASK_LEFT_OFF; /* no left border on next line */
1079: ShifterFrame.ShifterLines[ HblCounterVideo+1 ].DisplayStartCycle = LINE_START_CYCLE_71;
1080: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect remove right full %d<->%d\n" ,
1081: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
1082: }
1083: else /* Pax Plax Parralax in Beyond by Kruz */
1084: {
1085: ShifterFrame.ShifterLines[ HblCounterVideo+1 ].BorderMask = BORDERMASK_EMPTY_LINE;
1086: ShifterFrame.ShifterLines[ HblCounterVideo+1 ].DisplayStartCycle = 0;
1087: ShifterFrame.ShifterLines[ HblCounterVideo+1 ].DisplayEndCycle = 0;
1088: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect empty line res 3 %d<->%d for nHBL=%d\n" ,
1089: ShifterFrame.ShifterLines[ HblCounterVideo+1 ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo+1 ].DisplayEndCycle , nHBL+1 );
1090: }
1.1.1.15 root 1091: }
1092:
1093: /* If left border is opened and we switch to medium resolution during the next cycles, */
1094: /* then we assume a med res overscan line instead of a low res overscan line. */
1095: /* Note that in that case, the switch to med res can shift the display by 0-3 words */
1.1.1.11 root 1096: /* Used in 'No Cooper' greetings by 1984 and 'Punish Your Machine' by Delta Force */
1.1.1.15 root 1097: if ( ( ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask & BORDERMASK_LEFT_OFF )
1098: && ( Res == 0x01 ) )
1.1.1.11 root 1099: {
1.1.1.18 root 1100: if ( ( LineCycles == LINE_LEFT_MED_CYCLE_1 ) /* 'No Cooper' timing */
1101: || ( LineCycles == LINE_LEFT_MED_CYCLE_1+16 ) ) /* 'No Cooper' timing while removing bottom border */
1.1.1.11 root 1102: {
1.1.1.15 root 1103: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect med res overscan offset 0 byte\n" );
1104: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_OVERSCAN_MED_RES | ( 0 << 20 );
1.1.1.11 root 1105: }
1.1.1.15 root 1106: else if ( LineCycles == LINE_LEFT_MED_CYCLE_2 ) /* 'Best Part Of The Creation / PYM' timing */
1.1.1.11 root 1107: {
1.1.1.15 root 1108: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect med res overscan offset 2 bytes\n" );
1109: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_OVERSCAN_MED_RES | ( 2 << 20 );
1.1.1.11 root 1110: }
1111: }
1112:
1.1.1.15 root 1113: /* If left border was opened with a hi/med res switch we need to check */
1114: /* if the switch to low res can trigger a right hardware scrolling. */
1115: /* We store the pixels count in DisplayPixelShift */
1116: if ( ( ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask & BORDERMASK_LEFT_OFF_MED )
1117: && ( Res == 0x00 ) && ( LineCycles <= LINE_SCROLL_1_CYCLE_50 ) )
1.1.1.11 root 1118: {
1.1.1.15 root 1119: /* The hi/med switch was a switch to do low res hardware scrolling, */
1120: /* so we must cancel the med res overscan bit. */
1121: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask &= (~BORDERMASK_OVERSCAN_MED_RES);
1.1.1.11 root 1122:
1.1.1.15 root 1123: if ( LineCycles == LINE_SCROLL_13_CYCLE_50 ) /* cycle 20 */
1.1.1.11 root 1124: {
1.1.1.15 root 1125: LOG_TRACE(TRACE_VIDEO_BORDER_H , "detect 13 pixels right scroll\n" );
1126: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayPixelShift = 13;
1.1.1.11 root 1127: }
1.1.1.15 root 1128: else if ( LineCycles == LINE_SCROLL_9_CYCLE_50 ) /* cycle 24 */
1.1.1.11 root 1129: {
1.1.1.15 root 1130: LOG_TRACE(TRACE_VIDEO_BORDER_H , "detect 9 pixels right scroll\n" );
1131: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayPixelShift = 9;
1.1.1.11 root 1132: }
1.1.1.15 root 1133: else if ( LineCycles == LINE_SCROLL_5_CYCLE_50 ) /* cycle 28 */
1.1.1.11 root 1134: {
1.1.1.15 root 1135: LOG_TRACE(TRACE_VIDEO_BORDER_H , "detect 5 pixels right scroll\n" );
1136: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayPixelShift = 5;
1.1.1.11 root 1137: }
1.1.1.15 root 1138: else if ( LineCycles == LINE_SCROLL_1_CYCLE_50 ) /* cycle 32 */
1.1.1.11 root 1139: {
1.1.1.15 root 1140: LOG_TRACE(TRACE_VIDEO_BORDER_H , "detect 1 pixel right scroll\n" );
1141: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayPixelShift = 1;
1.1.1.11 root 1142: }
1143: }
1144:
1.1.1.18 root 1145: #define SCROLL2_4PX
1146: #ifdef SCROLL2_4PX
1147: /* Left border was removed with a hi/lo switch, then a med res switch was made */
1148: /* Depending on the low res switch, the screen will be shifted as a low res overscan line */
1149: /* This is a different method than the one used by ST Connexion with only 3 res switches */
1150: /* (so we must cancel the med res overscan bit) */
1151: if ( ( ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask & BORDERMASK_OVERSCAN_MED_RES )
1152: && ( ( ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask & ( 0xf << 20 ) ) == 0 )
1153: && ( Res == 0x00 ) && ( LineCycles <= 40 ) )
1154: {
1155: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask &= (~BORDERMASK_OVERSCAN_MED_RES); /* cancel mid res */
1156:
1157: if ( LineCycles == 28 )
1158: {
1159: LOG_TRACE(TRACE_VIDEO_BORDER_H , "detect 13 pixels right scroll 2\n" );
1160: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayPixelShift = 13;
1161: }
1162: else if ( LineCycles == 32 )
1163: {
1164: LOG_TRACE(TRACE_VIDEO_BORDER_H , "detect 9 pixels right scroll 2\n" );
1165: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayPixelShift = 9;
1166: }
1167: else if ( LineCycles == 36 )
1168: {
1169: LOG_TRACE(TRACE_VIDEO_BORDER_H , "detect 5 pixels right scroll 2\n" );
1170: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayPixelShift = 5;
1171: }
1172: else if ( LineCycles == 40 )
1173: {
1174: LOG_TRACE(TRACE_VIDEO_BORDER_H , "detect 1 pixel right scroll 2\n" );
1175: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayPixelShift = 1;
1176: }
1177: }
1178: #endif
1179:
1.1.1.15 root 1180:
1181: /* Update HBL's position only if display has not reached pos LINE_START_CYCLE_50 */
1182: /* and HBL interrupt was already handled at the beginning of this line. */
1183: /* This also changes the number of cycles per line. */
1184: if ( ( LineCycles <= LINE_START_CYCLE_50 ) && ( HblCounterVideo == nHBL ) )
1185: {
1186: nCyclesPerLine = Video_HBL_GetPos();
1187: Video_AddInterruptHBL ( nCyclesPerLine );
1188: }
1189:
1190:
1191: /* Update Timer B's position */
1192: LineTimerBCycle = Video_TimerB_GetPos ( HblCounterVideo );
1193: Video_AddInterruptTimerB ( LineTimerBCycle );
1194:
1195:
1196: ShifterFrame.Res = Res;
1197: if ( Res == 0x02 ) /* high res */
1198: {
1199: ShifterFrame.ResPosHi.VBL = nVBLs;
1200: ShifterFrame.ResPosHi.FrameCycles = FrameCycles;
1201: ShifterFrame.ResPosHi.HBL = HblCounterVideo;
1202: ShifterFrame.ResPosHi.LineCycles = LineCycles;
1203: }
1204: else if ( Res == 0x01 ) /* med res */
1205: {
1206: ShifterFrame.ResPosMed.VBL = nVBLs;
1207: ShifterFrame.ResPosMed.FrameCycles = FrameCycles;
1208: ShifterFrame.ResPosMed.HBL = HblCounterVideo;
1209: ShifterFrame.ResPosMed.LineCycles = LineCycles;
1210: }
1211: else /* low res */
1212: {
1213: ShifterFrame.ResPosLo.VBL = nVBLs;
1214: ShifterFrame.ResPosLo.FrameCycles = FrameCycles;
1215: ShifterFrame.ResPosLo.HBL = HblCounterVideo;
1216: ShifterFrame.ResPosLo.LineCycles = LineCycles;
1217: }
1218: }
1219:
1220:
1221:
1222: /*-----------------------------------------------------------------------*/
1223: /**
1224: * Set some default values for DisplayStartCycle/DisplayEndCycle
1225: * when changing frequency in lo/med res (testing orders are important
1226: * because the line can already have some borders changed).
1227: * This is necessary as some freq changes can modify start/end
1228: * even if they're not made at the exact borders' positions.
1229: * These values will be modified later if some borders are changed.
1230: */
1231: static void Video_Sync_SetDefaultStartEnd ( Uint8 Freq , int HblCounterVideo , int LineCycles )
1232: {
1233: if ( Freq == 0x02 ) /* switch to 50 Hz */
1234: {
1235: if ( ( LineCycles <= ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle ) /* start could be 0,52,56 */
1236: && ( ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle == LINE_START_CYCLE_60 ) )
1237: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle = LINE_START_CYCLE_50;
1238:
1239: if ( ( LineCycles <= ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle ) /* end could be 160,372,376,460 */
1240: && ( ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle < LINE_END_CYCLE_50 ) )
1241: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle = LINE_END_CYCLE_50;
1242: }
1243:
1244: else /* switch to 60 Hz */
1245: {
1246: if ( LineCycles < ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle ) /* start could be 0,52,56 */
1247: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle = LINE_START_CYCLE_60;
1248:
1249: if ( ( LineCycles < ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle ) /* end could be 160,372,376,460 */
1250: && ( ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle <= LINE_END_CYCLE_50 ) )
1251: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle = LINE_END_CYCLE_60;
1252: }
1253:
1.1.1.21! root 1254: //fprintf ( stderr , "sync default pos %d %d %d\n", HblCounterVideo , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
1.1.1.11 root 1255: }
1256:
1257:
1258: /*-----------------------------------------------------------------------*/
1259: /**
1260: * Write to VideoSync (0xff820a), Hz setting
1261: */
1.1.1.15 root 1262: void Video_Sync_WriteByte ( void )
1.1 root 1263: {
1.1.1.15 root 1264: int FrameCycles, HblCounterVideo, LineCycles;
1265: Uint8 Freq;
1.1.1.11 root 1266:
1267:
1.1.1.15 root 1268: if ( bUseVDIRes )
1269: return; /* no 50/60 Hz freq in VDI mode */
1.1.1.11 root 1270:
1271:
1.1.1.15 root 1272: /* We're only interested in bit 1 (50/60Hz) */
1273: Freq = IoMem[0xff820a] & 2;
1.1.1.11 root 1274:
1.1.1.15 root 1275: Video_GetPosition_OnWriteAccess ( &FrameCycles , &HblCounterVideo , &LineCycles );
1276:
1277: 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",
1278: Freq, FrameCycles, LineCycles, nHBL, HblCounterVideo, M68000_GetPC(), CurrentInstrCycles );
1.1.1.11 root 1279:
1.1.1.13 root 1280: /* Ignore consecutive writes of the same value */
1.1.1.15 root 1281: if ( Freq == ShifterFrame.Freq )
1.1.1.13 root 1282: return; /* do nothing */
1283:
1.1.1.15 root 1284: /* Ignore freq changes if we are in high res */
1285: /* 2009/04/26 : don't ignore for now (see ST Cnx in Punish Your Machine) */
1286: // if ( ShifterFrame.Res == 0x02 )
1287: // return; /* do nothing */
1288:
1289: /* Set some default values for DisplayStartCycle/DisplayEndCycle before checking for border removal */
1290: Video_Sync_SetDefaultStartEnd ( Freq , HblCounterVideo , LineCycles );
1291:
1292:
1293: if ( ( ShifterFrame.Freq == 0x00 ) && ( Freq == 0x02 ) /* switched from 60 Hz to 50 Hz ? */
1294: // && ( ShifterFrame.FreqPos60.VBL == nVBLs ) /* switched during the same VBL */
1295: && ( HblCounterVideo >= nStartHBL ) /* only if display is on */
1.1.1.18 root 1296: && ( HblCounterVideo < nEndHBL + BlankLines ) ) /* only if display is on */
1.1.1.15 root 1297: {
1.1.1.18 root 1298: /* Blank line switching freq on STF : switch to 60 Hz on cycle 28, then go back to 50 Hz on cycle 36 */
1299: /* This creates a blank line where no signal is displayed, but the video counter will still change for this line */
1300: /* This blank line can be combined with left/right border changes */
1301: if ( ( FrameCycles - ShifterFrame.FreqPos60.FrameCycles <= 16 )
1302: && ( ShifterFrame.FreqPos60.LineCycles == LINE_EMPTY_CYCLE_71_STF )
1303: && ( ConfigureParams.System.nMachineType == MACHINE_ST ) )
1304: {
1305: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_BLANK_LINE;
1306: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect blank line freq\n" );
1307: }
1308:
1.1.1.15 root 1309: /* Add 2 bytes to left border : switch to 60 Hz before LINE_START_CYCLE_60 to force an early start */
1310: /* of the DE signal, then go back to 50 Hz. Note that depending on where the 50 Hz switch is made */
1311: /* the HBL signal will be at position 508 (60 Hz line) or 512 (50 Hz line) */
1312: /* Obtaining a +2 line with 512 cycles requires a 2 cycles precision and is "wake up" state dependant */
1313: if ( ( ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle == LINE_START_CYCLE_60 )
1314: && ( LineCycles >= LINE_START_CYCLE_50 ) /* The line started in 60 Hz and continues in 50 Hz */
1315: && ( LineCycles <= ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle ) ) /* change when line is active */
1.1.1.11 root 1316: {
1.1.1.15 root 1317: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_LEFT_PLUS_2;
1318: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle = LINE_END_CYCLE_50;
1319: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect left+2 %d<->%d\n" ,
1320: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
1.1.1.11 root 1321: }
1322:
1.1.1.15 root 1323: /* Empty line switching freq : start the line in 50 Hz, change to 60 Hz at the exact place */
1324: /* where display is enabled in 50 Hz, then go back to 50 Hz. */
1325: /* Due to 4 cycles precision instead of 2, we must accept a 60 Hz switch at pos 56 or 56+4 */
1326: else if ( ( FrameCycles - ShifterFrame.FreqPos60.FrameCycles <= 24 )
1327: && ( ( ShifterFrame.FreqPos60.LineCycles == LINE_START_CYCLE_50 ) || ( ShifterFrame.FreqPos60.LineCycles == LINE_START_CYCLE_50+4 ) )
1328: && ( LineCycles > LINE_START_CYCLE_50 ) )
1329: {
1330: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_EMPTY_LINE;
1331: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle = 0;
1332: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle = 0;
1333: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect empty line freq %d<->%d\n" ,
1334: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
1.1.1.11 root 1335: }
1.1.1.15 root 1336:
1337: /* Remove 2 bytes to the right : start the line in 50 Hz (pos 0 or 56), change to 60 Hz before the position */
1338: /* where display is disabled in 60 Hz, then go back to 50 Hz */
1339: if ( ( LineCycles > LINE_END_CYCLE_60 ) /* back to 50 Hz after end of 60 Hz line */
1340: && ( ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle != LINE_START_CYCLE_60 ) /* start could be 0 or 56 */
1341: && ( ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle == LINE_END_CYCLE_60 ) )
1342: {
1343: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_RIGHT_MINUS_2;
1344: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect right-2 %d<->%d\n" ,
1345: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
1346: }
1347:
1.1.1.11 root 1348: }
1349:
1.1.1.15 root 1350:
1351: if ( ( ShifterFrame.Freq == 0x02 && Freq == 0x00 ) /* switched from 50 Hz to 60 Hz ? */
1352: && ( HblCounterVideo >= nStartHBL ) /* only if display is on */
1.1.1.18 root 1353: && ( HblCounterVideo < nEndHBL + BlankLines ) ) /* only if display is on */
1.1.1.15 root 1354: {
1355: /* remove right border, display 44 bytes more : switch to 60 Hz at the position where */
1.1.1.21! root 1356: /* the line ends in 50 Hz. Some programs don't switch back to 50 Hz immediately */
1.1.1.15 root 1357: /* (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 */
1358: if ( ( LineCycles == LINE_END_CYCLE_50 )
1359: && ( ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle == LINE_END_CYCLE_50 ) )
1360: {
1361: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_RIGHT_OFF;
1.1.1.16 root 1362: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle = LINE_END_CYCLE_NO_RIGHT;
1.1.1.15 root 1363: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect remove right %d<->%d\n" ,
1364: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
1.1.1.11 root 1365: }
1366: }
1367:
1368:
1369: /* Store cycle position of freq 50/60 to check for top/bottom border removal in Video_EndHBL. */
1.1.1.15 root 1370: if ( Freq == 0x02 ) /* switch to 50 Hz */
1.1.1.11 root 1371: {
1.1.1.13 root 1372: if ( ( HblCounterVideo < VIDEO_START_HBL_50HZ ) /* nStartHBL can change only if display is not ON yet */
1373: && ( OverscanMode & OVERSCANMODE_TOP ) == 0 ) /* update only if top was not removed */
1374: nStartHBL = VIDEO_START_HBL_50HZ;
1.1.1.11 root 1375:
1.1.1.13 root 1376: if ( ( HblCounterVideo < VIDEO_END_HBL_50HZ ) /* nEndHBL can change only if display is not OFF yet */
1.1.1.11 root 1377: && ( OverscanMode & OVERSCANMODE_BOTTOM ) == 0 ) /* update only if bottom was not removed */
1.1.1.13 root 1378: nEndHBL = VIDEO_END_HBL_50HZ; /* 263 */
1.1.1.11 root 1379: }
1.1.1.15 root 1380: else if ( Freq == 0x00 ) /* switch to 60 Hz */
1.1.1.11 root 1381: {
1.1.1.13 root 1382: if ( ( HblCounterVideo < VIDEO_START_HBL_60HZ-1 ) /* nStartHBL can change only if display is not ON yet */
1.1.1.15 root 1383: || ( ( HblCounterVideo == VIDEO_START_HBL_60HZ-1 ) && ( LineCycles <= LineRemoveTopCycle ) ) )
1.1.1.13 root 1384: nStartHBL = VIDEO_START_HBL_60HZ;
1.1.1.11 root 1385:
1.1.1.13 root 1386: if ( ( HblCounterVideo < VIDEO_END_HBL_60HZ ) /* nEndHBL can change only if display is not OFF yet */
1.1.1.11 root 1387: && ( OverscanMode & OVERSCANMODE_BOTTOM ) == 0 ) /* update only if bottom was not removed */
1.1.1.13 root 1388: nEndHBL = VIDEO_END_HBL_60HZ; /* 234 */
1389: }
1390:
1.1.1.15 root 1391:
1.1.1.13 root 1392: /* If the frequence changed, we need to update the EndLine interrupt */
1.1.1.21! root 1393: /* so that it happens TIMERB_VIDEO_CYCLE_OFFSET cycles after the current DisplayEndCycle.*/
1.1.1.13 root 1394: /* We check if the change affects the current line or the next one. */
1.1.1.15 root 1395: /* We also need to check if the HBL interrupt and nCyclesPerLine need */
1396: /* to be updated first. */
1397: if ( Freq != ShifterFrame.Freq )
1398: {
1399: /* Update HBL's position only if display has not reached pos LINE_START_CYCLE_50 */
1400: /* and HBL interrupt was already handled at the beginning of this line. */
1401: /* This also changes the number of cycles per line. */
1402: if ( ( LineCycles <= LINE_START_CYCLE_50 ) && ( HblCounterVideo == nHBL ) )
1403: {
1404: nCyclesPerLine = Video_HBL_GetPos();
1405: Video_AddInterruptHBL ( nCyclesPerLine );
1406: }
1407:
1408: /* Update Timer B's position */
1409: LineTimerBCycle = Video_TimerB_GetPos ( HblCounterVideo );
1410: Video_AddInterruptTimerB ( LineTimerBCycle );
1411: }
1412:
1413:
1414: ShifterFrame.Freq = Freq;
1415: if ( Freq == 0x02 ) /* 50 Hz */
1416: {
1417: ShifterFrame.FreqPos50.VBL = nVBLs;
1418: ShifterFrame.FreqPos50.FrameCycles = FrameCycles;
1419: ShifterFrame.FreqPos50.HBL = HblCounterVideo;
1420: ShifterFrame.FreqPos50.LineCycles = LineCycles;
1421: }
1422: else
1423: {
1424: ShifterFrame.FreqPos60.VBL = nVBLs;
1425: ShifterFrame.FreqPos60.FrameCycles = FrameCycles;
1426: ShifterFrame.FreqPos60.HBL = HblCounterVideo;
1427: ShifterFrame.FreqPos60.LineCycles = LineCycles;
1428: }
1429: }
1430:
1431:
1432: /*-----------------------------------------------------------------------*/
1433: /**
1434: * Compute the cycle position where the HBL should happen on each line.
1435: * In low/med res, the position depends on the video frequency (50/60 Hz)
1436: * In high res, the position is always the same.
1437: * This position also gives the number of CPU cycles per video line.
1438: */
1439: static int Video_HBL_GetPos ( void )
1440: {
1441: int Pos;
1442:
1443: if ( ( IoMem_ReadByte ( 0xff8260 ) & 3 ) == 2 ) /* hi res */
1444: Pos = CYCLES_PER_LINE_71HZ;
1445:
1446: else /* low res or med res */
1447: {
1448: if ( IoMem_ReadByte ( 0xff820a ) & 2 ) /* 50 Hz, pos 512 */
1449: Pos = CYCLES_PER_LINE_50HZ;
1450: else /* 60 Hz, pos 508 */
1451: Pos = CYCLES_PER_LINE_60HZ;
1452: }
1453:
1454: return Pos;
1455: }
1456:
1457:
1458: /*-----------------------------------------------------------------------*/
1459: /**
1460: * Compute the cycle position where the timer B should happen on each
1461: * visible line.
1462: * We compute Timer B position for the given LineNumber, using start/end
1463: * display cycles from ShifterLines[ LineNumber ].
1464: * The position depends on the start of line / end of line positions
1465: * (which depend on the current frequency / border tricks) and
1466: * on the value of the bit 3 in the MFP's AER.
1467: * If bit is 0, timer B will count end of line events (usual case),
1468: * but if bit is 1, timer B will count start of line events (eg Seven Gates Of Jambala)
1469: */
1470: int Video_TimerB_GetPos ( int LineNumber )
1471: {
1472: int Pos;
1473:
1474: if ( ( IoMem[0xfffa03] & ( 1 << 3 ) ) == 0 ) /* we're counting end of line events */
1475: {
1476: Pos = ShifterFrame.ShifterLines[ LineNumber ].DisplayEndCycle + TIMERB_VIDEO_CYCLE_OFFSET;
1477: }
1478: else /* we're counting start of line events */
1479: {
1480: Pos = ShifterFrame.ShifterLines[ LineNumber ].DisplayStartCycle + TIMERB_VIDEO_CYCLE_OFFSET;
1481: }
1482:
1.1.1.18 root 1483: //fprintf ( stderr , "timerb pos=%d\n" , Pos );
1484: return Pos;
1485: }
1486:
1487:
1488: /*-----------------------------------------------------------------------*/
1489: /**
1490: * Compute the default cycle position where the timer B should happen
1491: * on the next line, when restarting the INTERRUPT_VIDEO_ENDLINE handler.
1492: * In low/med res, the position depends on the video frequency (50/60 Hz)
1493: * In high res, the position is always the same.
1494: */
1495: int Video_TimerB_GetDefaultPos ( void )
1496: {
1497: int Pos;
1498:
1499: if ( ( IoMem[0xfffa03] & ( 1 << 3 ) ) == 0 ) /* we're counting end of line events */
1500: {
1501: if ( ( IoMem_ReadByte ( 0xff8260 ) & 3 ) == 2 ) /* hi res */
1502: Pos = LINE_END_CYCLE_71;
1503:
1504: else /* low res or med res */
1505: {
1506: if ( IoMem_ReadByte ( 0xff820a ) & 2 ) /* 50 Hz, pos 376 */
1507: Pos = LINE_END_CYCLE_50;
1508: else /* 60 Hz, pos 372 */
1509: Pos = LINE_END_CYCLE_60;
1510: }
1511: }
1512: else /* we're counting start of line events */
1513: {
1514: if ( ( IoMem_ReadByte ( 0xff8260 ) & 3 ) == 2 ) /* hi res */
1515: Pos = LINE_START_CYCLE_71;
1516:
1517: else /* low res or med res */
1518: {
1519: if ( IoMem_ReadByte ( 0xff820a ) & 2 ) /* 50 Hz, pos 56 */
1520: Pos = LINE_START_CYCLE_50;
1521: else /* 60 Hz, pos 52 */
1522: Pos = LINE_START_CYCLE_60;
1523: }
1524: }
1525:
1526: Pos += TIMERB_VIDEO_CYCLE_OFFSET;
1527:
1528: //fprintf ( stderr , "timerb default pos=%d\n" , Pos );
1.1.1.15 root 1529: return Pos;
1530: }
1531:
1532:
1533: /*-----------------------------------------------------------------------*/
1534: /**
1535: * HBL interrupt : this occurs at the end of every line, on cycle 512 (in 50 Hz)
1536: * It takes 56 cycles to handle the 68000's exception.
1537: */
1538: void Video_InterruptHandler_HBL ( void )
1539: {
1540: int FrameCycles = Cycles_GetCounter(CYCLES_COUNTER_VIDEO);
1541: int PendingCyclesOver;
1542: int NewHBLPos;
1543:
1544: /* How many cycle was this HBL delayed (>= 0) */
1545: PendingCyclesOver = -INT_CONVERT_FROM_INTERNAL ( PendingInterruptCount , INT_CPU_CYCLE );
1546:
1547: /* Remove this interrupt from list and re-order */
1.1.1.16 root 1548: CycInt_AcknowledgeInterrupt();
1.1.1.15 root 1549:
1.1.1.17 root 1550: /* Videl Vertical counter increment (To be removed when Videl emulation is finished) */
1551: /* VFC is incremented every half line, here, we increment it every line (should be completed) */
1552: if (ConfigureParams.System.nMachineType == MACHINE_FALCON) {
1553: vfc_counter += 1;
1554: }
1555:
1556:
1.1.1.15 root 1557: /* Increment the hbl jitter index */
1558: HblJitterIndex++;
1.1.1.20 root 1559: HblJitterIndex %= HBL_JITTER_ARRAY_SIZE;
1.1.1.15 root 1560:
1561: LOG_TRACE ( TRACE_VIDEO_HBL , "HBL %d video_cyc=%d pending_cyc=%d jitter=%d\n" ,
1562: nHBL , FrameCycles , PendingCyclesOver , HblJitterArray[ HblJitterIndex ] );
1563:
1564: /* Default cycle position for next HBL */
1565: NewHBLPos = Video_HBL_GetPos();
1566:
1567: /* Generate new HBL, if need to - there are 313 HBLs per frame in 50 Hz */
1568: if (nHBL < nScanlinesPerFrame-1)
1569: Video_AddInterruptHBL ( NewHBLPos );
1570:
1.1.1.21! root 1571: /* Print traces if pending HBL bit changed just before IACK when HBL interrupt is allowed */
! 1572: if ( ( CPU_IACK == true ) && ( regs.intmask < 2 ) )
1.1.1.15 root 1573: {
1.1.1.21! root 1574: if ( pendingInterrupts & ( 1 << 2 ) )
! 1575: {
! 1576: LOG_TRACE ( TRACE_VIDEO_HBL , "HBL %d, pending set again just before iack, skip one HBL interrupt VBL=%d video_cyc=%d pending_cyc=%d jitter=%d\n" ,
! 1577: nHBL , nVBLs , FrameCycles , PendingCyclesOver , VblJitterArray[ VblJitterIndex ] );
! 1578: }
! 1579: else
! 1580: {
! 1581: LOG_TRACE ( TRACE_VIDEO_HBL , "HBL %d, new pending HBL set just before iack VBL=%d video_cyc=%d pending_cyc=%d jitter=%d\n" ,
! 1582: nHBL , nVBLs , FrameCycles , PendingCyclesOver , VblJitterArray[ VblJitterIndex ] );
! 1583: }
1.1.1.15 root 1584: }
1585:
1.1.1.21! root 1586: /* Set pending bit for HBL interrupt in the CPU IPL */
! 1587: M68000_Exception(EXCEPTION_HBLANK , M68000_EXC_SRC_AUTOVEC); /* Horizontal blank interrupt, level 2 */
! 1588:
1.1.1.15 root 1589:
1590: Video_EndHBL(); /* Check some borders removal and copy line to display buffer */
1591:
1.1.1.17 root 1592: DmaSnd_STE_HBL_Update(); /* Update STE DMA sound if needed */
1593:
1.1.1.15 root 1594: nHBL++; /* Increase HBL count */
1595:
1596: if (nHBL < nScanlinesPerFrame)
1597: {
1598: /* Update start cycle for next HBL */
1599: ShifterFrame.ShifterLines[ nHBL ].StartCycle = FrameCycles - PendingCyclesOver;
1600: LOG_TRACE(TRACE_VIDEO_HBL, "HBL %d start=%d %x\n", nHBL,
1601: ShifterFrame.ShifterLines[nHBL].StartCycle, ShifterFrame.ShifterLines[nHBL].StartCycle);
1602:
1603: /* Setup next HBL */
1604: Video_StartHBL();
1605: }
1606: }
1607:
1608:
1609: /*-----------------------------------------------------------------------*/
1610: /**
1611: * Check at end of each HBL to see if any Shifter hardware tricks have been attempted
1612: * and copy the line to the screen buffer.
1613: * This is the place to check if top/bottom border were removed, as well as if some
1614: * left/right border changes were not validated before.
1615: * NOTE : the tests must be made with nHBL in ascending order.
1616: */
1617: static void Video_EndHBL(void)
1618: {
1619: //
1620: // Handle top/bottom borders removal when switching freq
1621: //
1622:
1623: /* Remove top border if the switch to 60 Hz was made during this vbl before cycle */
1.1.1.21! root 1624: /* LineRemoveTopCycle on line 33 and if the switch to 50 Hz has not yet occurred or */
! 1625: /* occurred before the 60 Hz or occurred after cycle LineRemoveTopCycle on line 33. */
1.1.1.15 root 1626: if ( ( nHBL == VIDEO_START_HBL_60HZ-1 ) /* last HBL before first line of a 60 Hz screen */
1627: && ( ShifterFrame.FreqPos60.VBL == nVBLs ) /* switch to 60 Hz during this VBL */
1.1.1.20 root 1628: && ( ( ShifterFrame.FreqPos60.HBL < nHBL )
1629: || ( ( ShifterFrame.FreqPos60.HBL == nHBL ) && ( ShifterFrame.FreqPos60.LineCycles <= LineRemoveTopCycle ) ) )
1.1.1.15 root 1630: && ( ( ShifterFrame.FreqPos50.VBL < nVBLs )
1631: || ( ShifterFrame.FreqPos50.FrameCycles < ShifterFrame.FreqPos60.FrameCycles )
1632: || ( ShifterFrame.FreqPos50.HBL > nHBL )
1.1.1.21! root 1633: || ( ( ShifterFrame.FreqPos50.HBL == nHBL ) && ( ShifterFrame.FreqPos50.LineCycles > LineRemoveTopCycle ) ) ) )
1.1.1.15 root 1634: {
1635: /* Top border */
1636: LOG_TRACE ( TRACE_VIDEO_BORDER_V , "detect remove top\n" );
1637: OverscanMode |= OVERSCANMODE_TOP; /* Set overscan bit */
1638: nStartHBL = VIDEO_START_HBL_60HZ; /* New start screen line */
1639: pHBLPaletteMasks -= OVERSCAN_TOP; // FIXME useless ?
1640: pHBLPalettes -= OVERSCAN_TOP; // FIXME useless ?
1641: }
1642:
1643: /* Remove bottom border for a 60 Hz screen (tests are similar to the ones for top border) */
1.1.1.18 root 1644: else if ( ( nHBL == VIDEO_END_HBL_60HZ + BlankLines - 1 ) /* last displayed line in 60 Hz */
1.1.1.15 root 1645: && ( nStartHBL == VIDEO_START_HBL_60HZ ) /* screen started in 60 Hz */
1646: && ( ( OverscanMode & OVERSCANMODE_TOP ) == 0 ) /* and top border was not removed : this screen is only 60 Hz */
1647: && ( ShifterFrame.FreqPos50.VBL == nVBLs ) /* switch to 50 Hz during this VBL */
1.1.1.20 root 1648: && ( ( ShifterFrame.FreqPos50.HBL < nHBL )
1649: || ( ( ShifterFrame.FreqPos50.HBL == nHBL ) && ( ShifterFrame.FreqPos50.LineCycles <= LineRemoveBottomCycle ) ) )
1.1.1.15 root 1650: && ( ( ShifterFrame.FreqPos60.VBL < nVBLs )
1651: || ( ShifterFrame.FreqPos60.FrameCycles < ShifterFrame.FreqPos50.FrameCycles )
1652: || ( ShifterFrame.FreqPos60.HBL > nHBL )
1.1.1.21! root 1653: || ( ( ShifterFrame.FreqPos60.HBL == nHBL ) && ( ShifterFrame.FreqPos60.LineCycles > LineRemoveBottomCycle ) ) ) )
1.1.1.15 root 1654: {
1655: LOG_TRACE ( TRACE_VIDEO_BORDER_V , "detect remove bottom 60Hz\n" );
1656: OverscanMode |= OVERSCANMODE_BOTTOM;
1657: nEndHBL = SCANLINES_PER_FRAME_60HZ; /* new end for a 60 Hz screen */
1658: }
1659:
1660: /* Remove bottom border for a 50 Hz screen (tests are similar to the ones for top border) */
1.1.1.18 root 1661: else if ( ( nHBL == VIDEO_END_HBL_50HZ + BlankLines - 1 ) /* last displayed line in 50 Hz */
1.1.1.15 root 1662: && ( ( OverscanMode & OVERSCANMODE_BOTTOM ) == 0 ) /* border was not already removed at line VIDEO_END_HBL_60HZ-1 */
1663: && ( ShifterFrame.FreqPos60.VBL == nVBLs ) /* switch to 60 Hz during this VBL */
1.1.1.20 root 1664: && ( ( ShifterFrame.FreqPos60.HBL < nHBL )
1665: || ( ( ShifterFrame.FreqPos60.HBL == nHBL ) && ( ShifterFrame.FreqPos60.LineCycles <= LineRemoveBottomCycle ) ) )
1.1.1.15 root 1666: && ( ( ShifterFrame.FreqPos50.VBL < nVBLs )
1667: || ( ShifterFrame.FreqPos50.FrameCycles < ShifterFrame.FreqPos60.FrameCycles )
1668: || ( ShifterFrame.FreqPos50.HBL > nHBL )
1.1.1.21! root 1669: || ( ( ShifterFrame.FreqPos50.HBL == nHBL ) && ( ShifterFrame.FreqPos50.LineCycles > LineRemoveBottomCycle ) ) ) )
1.1.1.13 root 1670: {
1.1.1.15 root 1671: LOG_TRACE ( TRACE_VIDEO_BORDER_V , "detect remove bottom\n" );
1672: OverscanMode |= OVERSCANMODE_BOTTOM;
1673: nEndHBL = VIDEO_END_HBL_50HZ+VIDEO_HEIGHT_BOTTOM_50HZ; /* new end for a 50 Hz screen */
1674: }
1675:
1676:
1677: //
1678: // Check some left/right borders effects that were not detected earlier
1679: // (this is usually due to staying in 60 Hz for too long, which is often a bad
1680: // coding practice as it can distort the display on a real ST)
1681: //
1682:
1683: /* Special case when the line was not started in 60 Hz, then switched to 60 Hz */
1684: /* and was not restored to 50 Hz before the end of the line. In that case, the */
1685: /* line ends 2 bytes earlier on the right (line can start at LINE_START_CYCLE_71/50) */
1686: /* Some programs also turn to 60 Hz too early during the active display of the last */
1687: /* line to remove the bottom border (FNIL by TNT), in that case, we should also remove */
1688: /* 2 bytes to this line */
1689: if ( ( ( ShifterFrame.ShifterLines[ nHBL ].BorderMask & BORDERMASK_RIGHT_MINUS_2 ) == 0 )
1690: && ( ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle != LINE_START_CYCLE_60 ) /* start could be 0 or 56 */
1691: && ( ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle == LINE_END_CYCLE_60 ) )
1692: {
1693: ShifterFrame.ShifterLines[ nHBL ].BorderMask |= BORDERMASK_RIGHT_MINUS_2;
1694: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect late right-2 %d<->%d\n" ,
1695: ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle , ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle );
1696: }
1697:
1698:
1699: /* Similar case when line started in 60 Hz but did not end at the usual LINE_END_CYCLE_60 position */
1700: /* (line can end at LINE_END_CYCLE_71/50 or have right border removed) */
1701: /* This means left border had 2 bytes more to display */
1702: if ( ( ( ShifterFrame.ShifterLines[ nHBL ].BorderMask & BORDERMASK_LEFT_PLUS_2 ) == 0 )
1703: && ( ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle == LINE_START_CYCLE_60 )
1704: && ( ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle != LINE_END_CYCLE_60 ) ) /* end could be 160, 372 or 460 */
1705: {
1706: ShifterFrame.ShifterLines[ nHBL ].BorderMask |= BORDERMASK_LEFT_PLUS_2;
1707: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect late left+2 %d<->%d\n" ,
1708: ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle , ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle );
1709: }
1710:
1711:
1712: /* Although a 'left+2' was detected earlier, the freq was switched back to 60 Hz during DE, so the line is just */
1713: /* a normal 60 Hz line ; we must cancel the 'left+2' flag */
1714: else if ( ( ShifterFrame.ShifterLines[ nHBL ].BorderMask & BORDERMASK_LEFT_PLUS_2 )
1715: && ( ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle == LINE_END_CYCLE_60 ) )
1716: {
1717: ShifterFrame.ShifterLines[ nHBL ].BorderMask &= ~BORDERMASK_LEFT_PLUS_2;
1718: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "cancel late left+2 %d<->%d\n" ,
1719: ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle , ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle );
1720: }
1721:
1722:
1.1.1.13 root 1723:
1.1.1.15 root 1724: /* Store palette for very first line on screen - HBLPalettes[0] */
1725: if (nHBL == nFirstVisibleHbl-1)
1726: {
1727: /* Store ALL palette for this line into raster table for datum */
1728: Video_StoreFirstLinePalette();
1729: }
1730:
1731: if (bUseHighRes)
1732: {
1733: /* Copy for hi-res (no overscan) */
1734: if (nHBL >= nFirstVisibleHbl && nHBL < nLastVisibleHbl)
1735: Video_CopyScreenLineMono();
1736: }
1737: /* Are we in possible visible color display (including borders)? */
1738: else if (nHBL >= nFirstVisibleHbl && nHBL < nLastVisibleHbl)
1739: {
1740: /* Store resolution for every line so can check for mix low/med screens */
1741: Video_StoreResolution(nHBL-nFirstVisibleHbl);
1742:
1743: /* Copy line of screen to buffer to simulate TV raster trace
1744: * - required for mouse cursor display/game updates
1745: * Eg, Lemmings and The Killing Game Show are good examples */
1746: Video_CopyScreenLineColor();
1747: }
1748: }
1749:
1750:
1751: /*-----------------------------------------------------------------------*/
1752: /**
1753: * Set default values for the next HBL, depending on the current res/freq.
1754: * We set the number of cycles per line, as well as some default values
1755: * for display start/end cycle.
1756: */
1757: static void Video_StartHBL(void)
1758: {
1.1.1.19 root 1759: if ((IoMem_ReadByte(0xff8260) & 3) == 2) /* hi res */
1.1.1.15 root 1760: {
1761: nCyclesPerLine = CYCLES_PER_LINE_71HZ;
1762: ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle = LINE_START_CYCLE_71;
1763: ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle = LINE_END_CYCLE_71;
1764: }
1765: else
1766: {
1767: if ( IoMem_ReadByte ( 0xff820a ) & 2 ) /* 50 Hz */
1768: {
1769: nCyclesPerLine = CYCLES_PER_LINE_50HZ;
1770: if ( ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle == -1 ) /* start not set yet */
1771: ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle = LINE_START_CYCLE_50;
1772: ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle = LINE_END_CYCLE_50;
1773: }
1774: else /* 60 Hz */
1775: {
1776: nCyclesPerLine = CYCLES_PER_LINE_60HZ;
1777: if ( ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle == -1 ) /* start not set yet */
1778: ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle = LINE_START_CYCLE_60;
1779: ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle = LINE_END_CYCLE_60;
1780: }
1781: }
1.1.1.21! root 1782: //fprintf (stderr , "Video_StartHBL %d %d %d\n", nHBL , ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle , ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle );
1.1.1.15 root 1783: }
1784:
1785:
1786: /*-----------------------------------------------------------------------*/
1787: /**
1788: * End Of Line interrupt
1789: * This interrupt is started on cycle position 404 in 50 Hz and on cycle
1790: * position 400 in 60 Hz. 50 Hz display ends at cycle 376 and 60 Hz displays
1.1.1.21! root 1791: * ends at cycle 372. This means the EndLine interrupt happens 24 cycles
1.1.1.15 root 1792: * after DisplayEndCycle.
1793: * Note that if bit 3 of MFP AER is 1, then timer B will count start of line
1.1.1.21! root 1794: * instead of end of line (at cycle 52+24 or 56+24)
1.1.1.15 root 1795: */
1796: void Video_InterruptHandler_EndLine(void)
1797: {
1798: int FrameCycles, HblCounterVideo, LineCycles;
1799: int PendingCycles = -INT_CONVERT_FROM_INTERNAL ( PendingInterruptCount , INT_CPU_CYCLE );
1800:
1801: Video_GetPosition ( &FrameCycles , &HblCounterVideo , &LineCycles );
1802:
1803: LOG_TRACE ( TRACE_VIDEO_HBL , "EndLine TB %d video_cyc=%d line_cyc=%d pending_int_cnt=%d\n" ,
1804: nHBL , FrameCycles , LineCycles , PendingCycles );
1805:
1806: /* Remove this interrupt from list and re-order */
1.1.1.16 root 1807: CycInt_AcknowledgeInterrupt();
1.1.1.15 root 1808:
1809: /* Ignore HBLs in VDI mode */
1810: if (bUseVDIRes)
1811: return;
1812:
1813: /* Generate new Endline, if need to - there are 313 HBLs per frame */
1814: if (nHBL < nScanlinesPerFrame-1)
1815: {
1.1.1.21! root 1816: /* By default, next EndLine's int will be on line nHBL+1 at pos 376+24 or 372+24 */
1.1.1.15 root 1817: if ( ( IoMem[0xfffa03] & ( 1 << 3 ) ) == 0 ) /* count end of line */
1.1.1.13 root 1818: {
1.1.1.15 root 1819: /* If EndLine int is delayed too much (more than 100 cycles), nLineCycles will */
1820: /* be in the range 0..xxx instead of 400..512. In that case, we need to add */
1821: /* nCyclesPerLine to be in the range 512..x+512 */
1822: /* Maximum possible delay should be around 160 cycles on STF (DIVS) */
1823: /* In that case, HBL int will be delayed too, so we will have HblCounterVideo == nHBL+1 */
1824: if ( HblCounterVideo == nHBL+1 ) /* int happened in fact on the next line nHBL+1 */
1825: LineCycles += nCyclesPerLine;
1.1.1.13 root 1826:
1.1.1.18 root 1827: LineTimerBCycle = Video_TimerB_GetDefaultPos ();
1.1.1.13 root 1828: }
1829:
1.1.1.15 root 1830: else /* count start of line, no possible delay to handle */
1.1.1.13 root 1831: {
1.1.1.18 root 1832: LineTimerBCycle = Video_TimerB_GetDefaultPos ();
1.1.1.13 root 1833: }
1834:
1.1.1.15 root 1835: //fprintf ( stderr , "new tb %d %d %d\n" , LineTimerBCycle , nCyclesPerLine , LineTimerBCycle - LineCycles + nCyclesPerLine );
1.1.1.16 root 1836: CycInt_AddRelativeInterrupt ( LineTimerBCycle - LineCycles + nCyclesPerLine,
1.1.1.15 root 1837: INT_CPU_CYCLE, INTERRUPT_VIDEO_ENDLINE );
1.1.1.11 root 1838: }
1839:
1.1.1.15 root 1840: /* Timer B occurs at END of first visible screen line in Event Count mode */
1.1.1.18 root 1841: if ( ( nHBL >= nStartHBL ) && ( nHBL < nEndHBL + BlankLines ) )
1.1.1.11 root 1842: {
1.1.1.15 root 1843: /* Handle Timer B when using Event Count mode */
1844: /* We must ensure that the write to fffa1b to activate timer B was */
1845: /* completed before the point where the end of line signal was generated */
1846: /* (in the case of a move.b #8,$fffa1b that would happen 4 cycles */
1847: /* before end of line, the interrupt should not be generated) */
1848: if ( (MFP_TBCR == 0x08) /* Is timer in Event Count mode ? */
1849: && ( ( TimerBEventCountCycleStart == -1 ) /* timer B was started during a previous VBL */
1850: || ( TimerBEventCountCycleStart < FrameCycles-PendingCycles ) ) ) /* timer B was started before this possible interrupt */
1.1.1.21! root 1851: MFP_TimerB_EventCount_Interrupt ( PendingCycles ); /* we have a valid timer B interrupt */
1.1.1.11 root 1852: }
1.1 root 1853: }
1854:
1.1.1.2 root 1855:
1.1.1.15 root 1856:
1857:
1.1.1.2 root 1858: /*-----------------------------------------------------------------------*/
1.1.1.11 root 1859: /**
1860: * Store whole palette on first line so have reference to work from
1861: */
1.1.1.7 root 1862: static void Video_StoreFirstLinePalette(void)
1.1 root 1863: {
1.1.1.11 root 1864: Uint16 *pp2;
1865: int i;
1866:
1867: pp2 = (Uint16 *)&IoMem[0xff8240];
1868: for (i = 0; i < 16; i++)
1869: HBLPalettes[i] = SDL_SwapBE16(*pp2++);
1.1 root 1870:
1.1.1.11 root 1871: /* And set mask flag with palette and resolution */
1872: // FIXME ; enlever PALETTEMASK_RESOLUTION
1873:
1.1.1.15 root 1874: // if ( ShifterFrame.ShifterLines[ nFirstVisibleHbl ].BorderMask == BORDERMASK_NONE ) // no border trick, store the current res
1.1.1.11 root 1875: HBLPaletteMasks[0] = (PALETTEMASK_RESOLUTION|PALETTEMASK_PALETTE) | (((Uint32)IoMem_ReadByte(0xff8260)&0x3)<<16);
1876: // else // border removal, assume low res for the whole line
1877: // HBLPaletteMasks[0] = (PALETTEMASK_RESOLUTION|PALETTEMASK_PALETTE) | (0<<16);
1.1 root 1878: }
1879:
1.1.1.2 root 1880:
1881: /*-----------------------------------------------------------------------*/
1.1.1.11 root 1882: /**
1883: * Store resolution on each line (used to test if mixed low/medium resolutions)
1884: */
1.1.1.7 root 1885: static void Video_StoreResolution(int y)
1.1 root 1886: {
1.1.1.11 root 1887: Uint8 res;
1888: int Mask;
1.1 root 1889:
1.1.1.11 root 1890: /* Clear resolution, and set with current value */
1891: if (!(bUseHighRes || bUseVDIRes))
1892: {
1.1.1.20 root 1893: if ( y >= HBL_PALETTE_MASKS ) /* we're above the limit (res was switched to mono for more than 1 VBL in color mode ?) */
1894: {
1895: // fprintf ( stderr , "store res %d line %d hbl %d %x %x %d\n" , res , y , nHBL, Mask , HBLPaletteMasks[y] , sizeof(HBLPalettes) );
1896: y = HBL_PALETTE_MASKS - 1; /* store in the last palette line */
1897: }
1898:
1.1.1.11 root 1899: HBLPaletteMasks[y] &= ~(0x3<<16);
1900: res = IoMem_ReadByte(0xff8260)&0x3;
1901:
1.1.1.15 root 1902: Mask = ShifterFrame.ShifterLines[ y+nFirstVisibleHbl ].BorderMask;
1.1.1.11 root 1903:
1.1.1.15 root 1904: if ( Mask & BORDERMASK_OVERSCAN_MED_RES ) /* special case for med res to render the overscan line */
1905: res = 1; /* med res instead of low res */
1.1.1.11 root 1906: else if ( Mask != BORDERMASK_NONE ) /* border removal : assume low res for the whole line */
1907: res = 0;
1.1.1.2 root 1908:
1.1.1.11 root 1909: HBLPaletteMasks[y] |= PALETTEMASK_RESOLUTION|((Uint32)res)<<16;
1910:
1911: #if 0
1912: if ( ( Mask == BORDERMASK_NONE ) /* no border trick, store the current res */
1913: || ( res == 0 ) || ( res == 1 ) ) /* if border trick, ignore passage to hi res */
1914: HBLPaletteMasks[y] |= PALETTEMASK_RESOLUTION|((Uint32)res)<<16;
1915: else /* border removal or hi res : assume low res for the whole line */
1916: HBLPaletteMasks[y] |= (0)<<16;
1917:
1.1.1.15 root 1918: /* special case for med res to render the overscan line */
1919: if ( Mask & BORDERMASK_OVERSCAN_MED_RES )
1920: HBLPaletteMasks[y] |= PALETTEMASK_RESOLUTION|((Uint32)1)<<16; /* med res instead of low res */
1.1.1.11 root 1921: #endif
1.1 root 1922:
1.1.1.11 root 1923: // fprintf ( stderr , "store res %d line %d %x %x\n" , res , y , Mask , HBLPaletteMasks[y] );
1924: }
1.1.1.9 root 1925: }
1926:
1927:
1928: /*-----------------------------------------------------------------------*/
1.1.1.11 root 1929: /**
1930: * Copy one line of monochrome screen into buffer for conversion later.
1931: */
1932: static void Video_CopyScreenLineMono(void)
1933: {
1934: /* Copy one line - 80 bytes in ST high resolution */
1935: memcpy(pSTScreen, pVideoRaster, SCREENBYTES_MONOLINE);
1936: pVideoRaster += SCREENBYTES_MONOLINE;
1937:
1938: /* Handle STE fine scrolling (HWScrollCount is zero on ST). */
1939: if (HWScrollCount)
1940: {
1941: Uint16 *pScrollAdj;
1942: int nNegScrollCnt;
1943:
1944: pScrollAdj = (Uint16 *)pSTScreen;
1945: nNegScrollCnt = 16 - HWScrollCount;
1946:
1947: /* Shift the whole line by the given scroll count */
1948: while ((Uint8*)pScrollAdj < pSTScreen + SCREENBYTES_MONOLINE-2)
1949: {
1950: do_put_mem_word(pScrollAdj, (do_get_mem_word(pScrollAdj) << HWScrollCount)
1951: | (do_get_mem_word(pScrollAdj+1) >> nNegScrollCnt));
1952: ++pScrollAdj;
1953: }
1954:
1955: /* Handle the last 16 pixels of the line */
1956: do_put_mem_word(pScrollAdj, (do_get_mem_word(pScrollAdj) << HWScrollCount)
1957: | (do_get_mem_word(pVideoRaster) >> nNegScrollCnt));
1958:
1959: /* HW scrolling advances Shifter video counter by one */
1960: pVideoRaster += 1 * 2;
1961: }
1962:
1963: /* LineWidth is zero on ST. */
1964: /* On STE, the Shifter skips the given amount of words. */
1965: pVideoRaster += LineWidth*2;
1966:
1967: /* On STE, handle modifications of the video counter address $ff8205/07/09 */
1968: /* that occurred while the display was already ON */
1.1.1.16 root 1969: if ( VideoCounterDelayedOffset != 0 )
1.1.1.11 root 1970: {
1.1.1.16 root 1971: pVideoRaster += ( VideoCounterDelayedOffset & ~1 );
1972: VideoCounterDelayedOffset = 0;
1.1.1.11 root 1973: }
1.1.1.16 root 1974:
1975: if ( pVideoRasterDelayed != NULL )
1.1.1.11 root 1976: {
1.1.1.16 root 1977: pVideoRaster = pVideoRasterDelayed;
1978: pVideoRasterDelayed = NULL;
1.1.1.11 root 1979: }
1980:
1981: /* On STE, if we wrote to the hwscroll register, we set the */
1982: /* new value here, once the current line was processed */
1983: if ( NewHWScrollCount >= 0 )
1984: {
1985: HWScrollCount = NewHWScrollCount;
1986: NewHWScrollCount = -1;
1987: }
1988:
1989: /* On STE, if we wrote to the linewidth register, we set the */
1990: /* new value here, once the current line was processed */
1991: if ( NewLineWidth >= 0 )
1992: {
1993: LineWidth = NewLineWidth;
1994: NewLineWidth = -1;
1995: }
1996:
1997: /* Each screen line copied to buffer is always same length */
1998: pSTScreen += SCREENBYTES_MONOLINE;
1999: }
2000:
2001:
2002: /*-----------------------------------------------------------------------*/
2003: /**
2004: * Copy one line of color screen into buffer for conversion later.
2005: * Possible lines may be top/bottom border, and/or left/right borders.
2006: */
1.1.1.9 root 2007: static void Video_CopyScreenLineColor(void)
2008: {
1.1.1.15 root 2009: int LineBorderMask;
1.1.1.11 root 2010: int VideoOffset = 0;
2011: int STF_PixelScroll = 0;
1.1.1.14 root 2012: int LineRes;
1.1.1.17 root 2013: Uint8 *pVideoRasterEndLine; /* addr of the last byte copied from pVideoRaster to pSTScreen (for HWScrollCount) */
2014: int i;
1.1.1.14 root 2015:
1.1.1.15 root 2016: LineBorderMask = ShifterFrame.ShifterLines[ nHBL ].BorderMask;
1.1.1.16 root 2017: STF_PixelScroll = ShifterFrame.ShifterLines[ nHBL ].DisplayPixelShift;
1.1.1.15 root 2018:
2019: /* Get resolution for this line (in case of mixed low/med screen) */
1.1.1.20 root 2020: i = nHBL-nFirstVisibleHbl;
2021: if ( i >= HBL_PALETTE_MASKS )
2022: i = HBL_PALETTE_MASKS - 1;
2023: LineRes = ( HBLPaletteMasks[i] >> 16 ) & 1; /* 0=low res 1=med res */
1.1.1.11 root 2024:
1.1.1.16 root 2025: //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 2026:
2027: /* If left border is opened, we need to compensate one missing word in low res (1 plan) */
1.1.1.15 root 2028: /* If overscan is in med res, the offset is variable */
2029: if ( LineBorderMask & BORDERMASK_OVERSCAN_MED_RES )
2030: VideoOffset = - ( ( LineBorderMask >> 20 ) & 0x0f ); /* No Cooper=0 PYM=-2 in med res overscan */
1.1.1.11 root 2031:
2032: else if ( LineBorderMask & BORDERMASK_LEFT_OFF )
1.1.1.18 root 2033: {
2034: #ifdef SCROLL2_4PX
2035: int ShiftPixels = 0;
2036:
2037: if ( STF_PixelScroll == 13 ) { VideoOffset = 2; ShiftPixels = 8; }
2038: else if ( STF_PixelScroll == 9 ) { VideoOffset = 0; ShiftPixels = 8; }
2039: else if ( STF_PixelScroll == 5 ) { VideoOffset = -2; ShiftPixels = 8; }
2040: else if ( STF_PixelScroll == 1 ) { VideoOffset = -4; ShiftPixels = 8; }
2041:
2042: else VideoOffset = -2; /* Normal low res left border removal without 4 pixels scrolling */
2043:
2044: STF_PixelScroll -= ShiftPixels;
2045: #else
1.1.1.14 root 2046: VideoOffset = -2; /* always 2 bytes in low res overscan */
1.1.1.18 root 2047: #endif
2048: }
1.1.1.11 root 2049:
1.1.1.16 root 2050: else if ( LineBorderMask & BORDERMASK_LEFT_OFF_2_STE )
2051: VideoOffset = -4; /* 4 first bytes of the line are not shown */
2052:
1.1.1.11 root 2053: /* Handle 4 pixels hardware scrolling ('ST Cnx' demo in 'Punish Your Machine') */
2054: /* Depending on the number of pixels, we need to compensate for some skipped words */
1.1.1.15 root 2055: else if ( LineBorderMask & BORDERMASK_LEFT_OFF_MED )
1.1.1.11 root 2056: {
1.1.1.16 root 2057: if ( STF_PixelScroll == 13 ) VideoOffset = 2;
2058: else if ( STF_PixelScroll == 9 ) VideoOffset = 0;
2059: else if ( STF_PixelScroll == 5 ) VideoOffset = -2;
2060: else if ( STF_PixelScroll == 1 ) VideoOffset = -4;
1.1.1.11 root 2061: else VideoOffset = 0; /* never used ? */
2062:
1.1.1.16 root 2063: STF_PixelScroll -= 8; /* removing left border in mid res also shifts display to the left */
1.1.1.11 root 2064: // fprintf(stderr , "scr off %d %d\n" , STF_PixelScroll , VideoOffset);
2065: }
2066:
1.1.1.13 root 2067:
1.1.1.11 root 2068: /* Is total blank line? I.e. top/bottom border? */
1.1.1.18 root 2069: if ((nHBL < nStartHBL) || (nHBL >= nEndHBL + BlankLines)
1.1.1.15 root 2070: || (LineBorderMask & BORDERMASK_EMPTY_LINE))
1.1.1.11 root 2071: {
2072: /* Clear line to color '0' */
2073: memset(pSTScreen, 0, SCREENBYTES_LINE);
2074: }
2075: else
2076: {
1.1.1.18 root 2077: /* Does have left border ? */
1.1.1.16 root 2078: if ( LineBorderMask & ( BORDERMASK_LEFT_OFF | BORDERMASK_LEFT_OFF_MED ) ) /* bigger line by 26 bytes on the left */
1.1.1.11 root 2079: {
2080: pVideoRaster += BORDERBYTES_LEFT-SCREENBYTES_LEFT+VideoOffset;
2081: memcpy(pSTScreen, pVideoRaster, SCREENBYTES_LEFT);
2082: pVideoRaster += SCREENBYTES_LEFT;
2083: }
1.1.1.16 root 2084: else if ( LineBorderMask & BORDERMASK_LEFT_OFF_2_STE ) /* bigger line by 20 bytes on the left (STE specific) */
2085: { /* bytes 0-3 are not shown, only next 16 bytes (32 pixels, 4 bitplanes) */
2086: if ( SCREENBYTES_LEFT > BORDERBYTES_LEFT_2_STE )
2087: {
2088: memset ( pSTScreen, 0, SCREENBYTES_LEFT-BORDERBYTES_LEFT_2_STE+4 ); /* clear unused pixels + bytes 0-3 */
2089: memcpy ( pSTScreen+SCREENBYTES_LEFT-BORDERBYTES_LEFT_2_STE+4, pVideoRaster+VideoOffset+4, BORDERBYTES_LEFT_2_STE-4 );
2090: }
2091: else
2092: memcpy ( pSTScreen, pVideoRaster+BORDERBYTES_LEFT_2_STE-SCREENBYTES_LEFT+VideoOffset, SCREENBYTES_LEFT );
2093:
2094: pVideoRaster += BORDERBYTES_LEFT_2_STE+VideoOffset;
2095: }
2096: else if (LineBorderMask & BORDERMASK_LEFT_PLUS_2) /* bigger line by 2 bytes on the left */
1.1.1.11 root 2097: {
1.1.1.16 root 2098: if ( SCREENBYTES_LEFT > 2 )
2099: {
2100: memset(pSTScreen,0,SCREENBYTES_LEFT-2); /* clear unused pixels */
2101: memcpy(pSTScreen+SCREENBYTES_LEFT-2, pVideoRaster, 2);
2102: }
2103: else
2104: { /* nothing to copy, left border is not large enough */
2105: }
2106:
1.1.1.11 root 2107: pVideoRaster += 2;
2108: }
1.1.1.16 root 2109: else if (bSteBorderFlag) /* bigger line by 8 bytes on the left (STE specific) */
1.1.1.12 root 2110: {
1.1.1.16 root 2111: if ( SCREENBYTES_LEFT > 4*2 )
2112: {
2113: memset(pSTScreen,0,SCREENBYTES_LEFT-4*2); /* clear unused pixels */
2114: memcpy(pSTScreen+SCREENBYTES_LEFT-4*2, pVideoRaster, 4*2);
2115: }
2116: else
2117: { /* nothing to copy, left border is not large enough */
2118: }
2119:
1.1.1.12 root 2120: pVideoRaster += 4*2;
2121: }
1.1.1.11 root 2122: else
1.1.1.16 root 2123: memset(pSTScreen,0,SCREENBYTES_LEFT); /* left border not removed, clear to color '0' */
1.1.1.11 root 2124:
2125: /* Short line due to hires in the middle ? */
2126: if (LineBorderMask & BORDERMASK_STOP_MIDDLE)
2127: {
2128: /* 106 bytes less in the line */
2129: memcpy(pSTScreen+SCREENBYTES_LEFT, pVideoRaster, SCREENBYTES_MIDDLE-106);
1.1.1.12 root 2130: memset(pSTScreen+SCREENBYTES_LEFT+SCREENBYTES_MIDDLE-106, 0, 106); /* clear unused pixels */
1.1.1.11 root 2131: pVideoRaster += (SCREENBYTES_MIDDLE-106);
2132: }
2133: else
2134: {
2135: /* normal middle part (160 bytes) */
2136: memcpy(pSTScreen+SCREENBYTES_LEFT, pVideoRaster, SCREENBYTES_MIDDLE);
2137: pVideoRaster += SCREENBYTES_MIDDLE;
2138: }
2139:
2140: /* Does have right border ? */
2141: if (LineBorderMask & BORDERMASK_RIGHT_OFF)
2142: {
2143: memcpy(pSTScreen+SCREENBYTES_LEFT+SCREENBYTES_MIDDLE, pVideoRaster, SCREENBYTES_RIGHT);
1.1.1.17 root 2144: pVideoRasterEndLine = pVideoRaster + SCREENBYTES_RIGHT;
1.1.1.16 root 2145: pVideoRaster += BORDERBYTES_RIGHT;
1.1.1.11 root 2146: }
2147: else if (LineBorderMask & BORDERMASK_RIGHT_MINUS_2)
2148: {
2149: /* Shortened line by 2 bytes */
2150: memset(pSTScreen+SCREENBYTES_LEFT+SCREENBYTES_MIDDLE-2, 0, SCREENBYTES_RIGHT+2);
2151: pVideoRaster -= 2;
1.1.1.17 root 2152: pVideoRasterEndLine = pVideoRaster;
1.1.1.11 root 2153: }
2154: else
2155: {
2156: /* Simply clear right border to '0' */
2157: memset(pSTScreen+SCREENBYTES_LEFT+SCREENBYTES_MIDDLE,0,SCREENBYTES_RIGHT);
1.1.1.17 root 2158: pVideoRasterEndLine = pVideoRaster;
1.1.1.11 root 2159: }
2160:
1.1.1.18 root 2161: /* Shifter read bytes and borders can change, but display is blank, so finally clear the line with color 0 */
2162: if (LineBorderMask & BORDERMASK_BLANK_LINE)
2163: memset(pSTScreen, 0, SCREENBYTES_LINE);
2164:
1.1.1.11 root 2165: /* Full right border removal up to the end of the line (cycle 512) */
2166: if (LineBorderMask & BORDERMASK_RIGHT_OFF_FULL)
2167: pVideoRaster += BORDERBYTES_RIGHT_FULL;
2168:
2169: /* Correct the offset for pVideoRaster from BORDERMASK_LEFT_OFF above if needed */
2170: pVideoRaster -= VideoOffset; /* VideoOffset is 0 or -2 */
2171:
2172:
2173: /* STE specific */
1.1.1.13 root 2174: if (!bSteBorderFlag && HWScrollCount) /* Handle STE fine scrolling (HWScrollCount is zero on ST) */
1.1.1.11 root 2175: {
1.1.1.13 root 2176: Uint16 *pScrollAdj; /* Pointer to actual position in line */
1.1.1.11 root 2177: int nNegScrollCnt;
1.1.1.13 root 2178: Uint16 *pScrollEndAddr; /* Pointer to end of the line */
1.1.1.11 root 2179:
2180: nNegScrollCnt = 16 - HWScrollCount;
2181: if (LineBorderMask & BORDERMASK_LEFT_OFF)
2182: pScrollAdj = (Uint16 *)pSTScreen;
1.1.1.16 root 2183: else if (LineBorderMask & BORDERMASK_LEFT_OFF_2_STE)
2184: {
2185: if ( SCREENBYTES_LEFT > BORDERBYTES_LEFT_2_STE )
1.1.1.17 root 2186: pScrollAdj = (Uint16 *)(pSTScreen+8); /* don't scroll the 8 first bytes (keep color 0)*/
1.1.1.16 root 2187: else
2188: pScrollAdj = (Uint16 *)pSTScreen; /* we render less bytes on screen than a real ST, scroll the whole line */
2189: }
1.1.1.11 root 2190: else
2191: pScrollAdj = (Uint16 *)(pSTScreen + SCREENBYTES_LEFT);
1.1.1.16 root 2192:
1.1.1.17 root 2193: /* When shifting the line to the left, we will have 'HWScrollCount' missing pixels at */
2194: /* the end of the line. We must complete these last 16 pixels with pixels from the */
2195: /* video counter last accessed value in pVideoRasterEndLine. */
2196: /* There're 2 passes : */
2197: /* - shift whole line except the last 16 pixels */
2198: /* - shift/complete the last 16 pixels */
2199:
2200: /* Addr of the last byte to shift in the 1st pass (excluding the last 16 pixels of the line) */
1.1.1.11 root 2201: if (LineBorderMask & BORDERMASK_RIGHT_OFF)
2202: pScrollEndAddr = (Uint16 *)(pSTScreen + SCREENBYTES_LINE - 8);
2203: else
2204: pScrollEndAddr = (Uint16 *)(pSTScreen + SCREENBYTES_LEFT + SCREENBYTES_MIDDLE - 8);
2205:
1.1.1.17 root 2206:
2207: if ( LineRes == 1 ) /* med res */
1.1.1.11 root 2208: {
1.1.1.15 root 2209: /* 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 2210: pScrollEndAddr += 2; /* 2 Uint16 = 4 bytes = 16 pixels */
1.1.1.14 root 2211:
1.1.1.17 root 2212: /* Shift the whole line to the left by the given scroll count (except the last 16 pixels) */
1.1.1.14 root 2213: while (pScrollAdj < pScrollEndAddr)
2214: {
2215: do_put_mem_word(pScrollAdj, (do_get_mem_word(pScrollAdj) << HWScrollCount)
2216: | (do_get_mem_word(pScrollAdj+2) >> nNegScrollCnt));
2217: ++pScrollAdj;
2218: }
1.1.1.17 root 2219: /* Handle the last 16 pixels of the line (complete the line with pixels from pVideoRasterEndLine) */
2220: for ( i=0 ; i<2 ; i++ )
2221: do_put_mem_word(pScrollAdj+i, (do_get_mem_word(pScrollAdj+i) << HWScrollCount)
2222: | (do_get_mem_word(pVideoRasterEndLine+i*2) >> nNegScrollCnt));
1.1.1.14 root 2223:
2224: /* Depending on whether $ff8264 or $ff8265 was used to scroll, */
2225: /* we prefetched 16 pixel (4 bytes) */
1.1.1.13 root 2226: if ( HWScrollPrefetch == 1 ) /* $ff8265 prefetches 16 pixels */
2227: pVideoRaster += 2 * 2; /* 2 bitplans */
1.1.1.14 root 2228:
2229: /* If scrolling with $ff8264, there's no prefetch, which means display starts */
2230: /* 16 pixels later but still stops at the normal point (eg we display */
2231: /* (320-16) pixels in low res). We shift the whole line 4 bytes to the right to */
2232: /* get the correct result (using memmove, as src/dest are overlapping). */
2233: else
2234: {
2235: if (LineBorderMask & BORDERMASK_RIGHT_OFF)
2236: memmove ( pSTScreen+4 , pSTScreen , SCREENBYTES_LINE - 4 );
2237: else
2238: memmove ( pSTScreen+4 , pSTScreen , SCREENBYTES_LEFT + SCREENBYTES_MIDDLE - 4 );
2239:
2240: memset ( pSTScreen , 0 , 4 ); /* first 16 pixels are color '0' */
2241: }
1.1.1.11 root 2242: }
1.1.1.14 root 2243:
1.1.1.17 root 2244: else /* low res */
1.1.1.11 root 2245: {
1.1.1.17 root 2246: /* Shift the whole line to the left by the given scroll count (except the last 16 pixels) */
1.1.1.11 root 2247: while (pScrollAdj < pScrollEndAddr)
2248: {
2249: do_put_mem_word(pScrollAdj, (do_get_mem_word(pScrollAdj) << HWScrollCount)
2250: | (do_get_mem_word(pScrollAdj+4) >> nNegScrollCnt));
2251: ++pScrollAdj;
2252: }
1.1.1.17 root 2253: /* Handle the last 16 pixels of the line (complete the line with pixels from pVideoRasterEndLine) */
2254: for ( i=0 ; i<4 ; i++ )
2255: do_put_mem_word(pScrollAdj+i, (do_get_mem_word(pScrollAdj+i) << HWScrollCount)
2256: | (do_get_mem_word(pVideoRasterEndLine+i*2) >> nNegScrollCnt));
1.1.1.13 root 2257:
2258: /* Depending on whether $ff8264 or $ff8265 was used to scroll, */
2259: /* we prefetched 16 pixel (8 bytes) */
2260: if ( HWScrollPrefetch == 1 ) /* $ff8265 prefetches 16 pixels */
2261: pVideoRaster += 4 * 2; /* 4 bitplans */
2262:
2263: /* If scrolling with $ff8264, there's no prefetch, which means display starts */
2264: /* 16 pixels later but still stops at the normal point (eg we display */
2265: /* (320-16) pixels in low res). We shift the whole line 8 bytes to the right to */
2266: /* get the correct result (using memmove, as src/dest are overlapping). */
2267: else
2268: {
2269: if (LineBorderMask & BORDERMASK_RIGHT_OFF)
2270: memmove ( pSTScreen+8 , pSTScreen , SCREENBYTES_LINE - 8 );
2271: else
2272: memmove ( pSTScreen+8 , pSTScreen , SCREENBYTES_LEFT + SCREENBYTES_MIDDLE - 8 );
2273:
2274: memset ( pSTScreen , 0 , 8 ); /* first 16 pixels are color '0' */
2275: }
1.1.1.11 root 2276:
2277: /* On STE, when we have a 230 bytes overscan line and HWScrollCount > 0 */
1.1.1.17 root 2278: /* we must read 6 bytes less than expected if scrolling is using prefetching ($ff8265) */
2279: /* (this is not the case for the 224 bytes overscan which is a multiple of 8) */
1.1.1.11 root 2280: if ( (LineBorderMask & BORDERMASK_LEFT_OFF) && (LineBorderMask & BORDERMASK_RIGHT_OFF) )
1.1.1.17 root 2281: {
2282: if ( HWScrollPrefetch == 1 )
2283: pVideoRaster -= 6; /* we don't add 8 bytes (see above), but 2 */
2284: else
2285: pVideoRaster -= 0;
2286: }
1.1.1.11 root 2287:
2288: }
2289: }
2290:
2291: /* LineWidth is zero on ST. */
2292: /* On STE, the Shifter skips the given amount of words. */
2293: pVideoRaster += LineWidth*2;
2294:
2295: /* On STE, handle modifications of the video counter address $ff8205/07/09 */
2296: /* that occurred while the display was already ON */
1.1.1.16 root 2297: if ( VideoCounterDelayedOffset != 0 )
1.1.1.11 root 2298: {
1.1.1.16 root 2299: pVideoRaster += ( VideoCounterDelayedOffset & ~1 );
2300: // fprintf ( stderr , "adjust video counter offset=%d new video=%x\n" , VideoCounterDelayedOffset , pVideoRaster-STRam );
2301: VideoCounterDelayedOffset = 0;
1.1.1.11 root 2302: }
1.1.1.16 root 2303:
2304: if ( pVideoRasterDelayed != NULL )
1.1.1.11 root 2305: {
1.1.1.16 root 2306: pVideoRaster = pVideoRasterDelayed;
2307: // fprintf ( stderr , "adjust video counter const new video=%x\n" , pVideoRaster-STRam );
2308: pVideoRasterDelayed = NULL;
1.1.1.11 root 2309: }
2310:
2311: /* On STE, if we wrote to the hwscroll register, we set the */
2312: /* new value here, once the current line was processed */
2313: if ( NewHWScrollCount >= 0 )
2314: {
2315: HWScrollCount = NewHWScrollCount;
1.1.1.13 root 2316: HWScrollPrefetch = NewHWScrollPrefetch;
1.1.1.11 root 2317: NewHWScrollCount = -1;
1.1.1.13 root 2318: NewHWScrollPrefetch = -1;
2319: }
2320:
2321: /* On STE, if we trigger the left border + 16 pixels trick, we set the */
2322: /* new value here, once the current line was processed */
2323: if ( NewSteBorderFlag >= 0 )
2324: {
2325: if ( NewSteBorderFlag == 0 )
1.1.1.15 root 2326: bSteBorderFlag = false;
1.1.1.13 root 2327: else
1.1.1.15 root 2328: bSteBorderFlag = true;
1.1.1.13 root 2329: NewSteBorderFlag = -1;
1.1.1.11 root 2330: }
2331:
2332: /* On STE, if we wrote to the linewidth register, we set the */
2333: /* new value here, once the current line was processed */
2334: if ( NewLineWidth >= 0 )
2335: {
2336: LineWidth = NewLineWidth;
2337: NewLineWidth = -1;
2338: }
1.1.1.16 root 2339:
2340:
2341: /* Handle 4 pixels hardware scrolling ('ST Cnx' demo in 'Punish Your Machine') */
1.1.1.21! root 2342: /* as well as scrolling occurring when removing the left border. */
1.1.1.16 root 2343: /* If >0, shift the line by STF_PixelScroll pixels to the right */
2344: /* If <0, shift the line by -STF_PixelScroll pixels to the left */
2345: /* This should be handled after the STE's hardware scrolling as it will scroll */
2346: /* the whole displayed area (while the STE scrolls pixels inside the displayed area) */
2347: if ( STF_PixelScroll > 0 )
2348: {
2349: Uint16 *pScreenLineEnd;
2350: int count;
2351:
2352: pScreenLineEnd = (Uint16 *) ( pSTScreen + SCREENBYTES_LINE - 2 );
1.1.1.17 root 2353: if ( LineRes == 0 ) /* low res */
2354: {
2355: for ( count = 0 ; count < ( SCREENBYTES_LINE - 8 ) / 2 ; count++ , pScreenLineEnd-- )
2356: do_put_mem_word ( pScreenLineEnd , ( ( do_get_mem_word ( pScreenLineEnd - 4 ) << 16 ) | ( do_get_mem_word ( pScreenLineEnd ) ) ) >> STF_PixelScroll );
2357: /* Handle the first 16 pixels of the line (add color 0 pixels to the extreme left) */
2358: do_put_mem_word ( pScreenLineEnd-0 , ( do_get_mem_word ( pScreenLineEnd-0 ) >> STF_PixelScroll ) );
2359: do_put_mem_word ( pScreenLineEnd-1 , ( do_get_mem_word ( pScreenLineEnd-1 ) >> STF_PixelScroll ) );
2360: do_put_mem_word ( pScreenLineEnd-2 , ( do_get_mem_word ( pScreenLineEnd-2 ) >> STF_PixelScroll ) );
2361: do_put_mem_word ( pScreenLineEnd-3 , ( do_get_mem_word ( pScreenLineEnd-3 ) >> STF_PixelScroll ) );
2362: }
2363: else /* med res */
2364: {
2365: for ( count = 0 ; count < ( SCREENBYTES_LINE - 4 ) / 2 ; count++ , pScreenLineEnd-- )
2366: do_put_mem_word ( pScreenLineEnd , ( ( do_get_mem_word ( pScreenLineEnd - 2 ) << 16 ) | ( do_get_mem_word ( pScreenLineEnd ) ) ) >> STF_PixelScroll );
2367: /* Handle the first 16 pixels of the line (add color 0 pixels to the extreme left) */
2368: do_put_mem_word ( pScreenLineEnd-0 , ( do_get_mem_word ( pScreenLineEnd-0 ) >> STF_PixelScroll ) );
2369: do_put_mem_word ( pScreenLineEnd-1 , ( do_get_mem_word ( pScreenLineEnd-1 ) >> STF_PixelScroll ) );
2370: }
1.1.1.16 root 2371: }
2372: else if ( STF_PixelScroll < 0 )
2373: {
2374: Uint16 *pScreenLineStart;
2375: int count;
2376:
2377: STF_PixelScroll = -STF_PixelScroll;
2378: pScreenLineStart = (Uint16 *)pSTScreen;
1.1.1.17 root 2379: if ( LineRes == 0 ) /* low res */
2380: {
2381: for ( count = 0 ; count < ( SCREENBYTES_LINE - 8 ) / 2 ; count++ , pScreenLineStart++ )
2382: do_put_mem_word ( pScreenLineStart , ( ( do_get_mem_word ( pScreenLineStart ) << STF_PixelScroll ) | ( do_get_mem_word ( pScreenLineStart + 4 ) >> (16-STF_PixelScroll) ) ) );
2383: /* Handle the last 16 pixels of the line (add color 0 pixels to the extreme right) */
2384: do_put_mem_word ( pScreenLineStart+0 , ( do_get_mem_word ( pScreenLineStart+0 ) << STF_PixelScroll ) );
2385: do_put_mem_word ( pScreenLineStart+1 , ( do_get_mem_word ( pScreenLineStart+1 ) << STF_PixelScroll ) );
2386: do_put_mem_word ( pScreenLineStart+2 , ( do_get_mem_word ( pScreenLineStart+2 ) << STF_PixelScroll ) );
2387: do_put_mem_word ( pScreenLineStart+3 , ( do_get_mem_word ( pScreenLineStart+3 ) << STF_PixelScroll ) );
2388: }
2389: else /* med res */
2390: {
2391: for ( count = 0 ; count < ( SCREENBYTES_LINE - 4 ) / 2 ; count++ , pScreenLineStart++ )
2392: do_put_mem_word ( pScreenLineStart , ( ( do_get_mem_word ( pScreenLineStart ) << STF_PixelScroll ) | ( do_get_mem_word ( pScreenLineStart + 2 ) >> (16-STF_PixelScroll) ) ) );
2393: /* Handle the last 16 pixels of the line (add color 0 pixels to the extreme right) */
2394: do_put_mem_word ( pScreenLineStart+0 , ( do_get_mem_word ( pScreenLineStart+0 ) << STF_PixelScroll ) );
2395: do_put_mem_word ( pScreenLineStart+1 , ( do_get_mem_word ( pScreenLineStart+1 ) << STF_PixelScroll ) );
2396: }
1.1.1.16 root 2397: }
1.1.1.11 root 2398: }
2399:
2400: /* Each screen line copied to buffer is always same length */
2401: pSTScreen += SCREENBYTES_LINE;
2402: }
2403:
2404:
2405: /*-----------------------------------------------------------------------*/
2406: /**
2407: * Copy extended GEM resolution screen
2408: */
1.1.1.9 root 2409: static void Video_CopyVDIScreen(void)
1.1 root 2410: {
1.1.1.11 root 2411: /* Copy whole screen, don't care about being exact as for GEM only */
2412: memcpy(pSTScreen, pVideoRaster, ((VDIWidth*VDIPlanes)/8)*VDIHeight);
1.1 root 2413: }
2414:
1.1.1.2 root 2415:
2416: /*-----------------------------------------------------------------------*/
1.1.1.11 root 2417: /**
2418: * Clear raster line table to store changes in palette/resolution on a line
2419: * basic. Called once on VBL interrupt.
2420: */
1.1 root 2421: void Video_SetScreenRasters(void)
2422: {
1.1.1.11 root 2423: pHBLPaletteMasks = HBLPaletteMasks;
2424: pHBLPalettes = HBLPalettes;
2425: memset(pHBLPaletteMasks, 0, sizeof(Uint32)*NUM_VISIBLE_LINES); /* Clear array */
1.1 root 2426: }
2427:
1.1.1.2 root 2428:
2429: /*-----------------------------------------------------------------------*/
1.1.1.11 root 2430: /**
2431: * Set pointers to HBLPalette tables to store correct colours/resolutions
2432: */
1.1.1.9 root 2433: static void Video_SetHBLPaletteMaskPointers(void)
1.1 root 2434: {
1.1.1.15 root 2435: int FrameCycles, HblCounterVideo, LineCycles;
1.1.1.11 root 2436: int Line;
2437:
2438: /* FIXME [NP] We should use Cycles_GetCounterOnWriteAccess, but it wouldn't */
2439: /* work when using multiple accesses instructions like move.l or movem */
1.1.1.15 root 2440: /* To correct this, we assume a delay of 8 cycles (should give a good approximation */
1.1.1.11 root 2441: /* of a move.w or movem.l for example) */
2442: // FrameCycles = Cycles_GetCounterOnWriteAccess(CYCLES_COUNTER_VIDEO);
2443: FrameCycles = Cycles_GetCounter(CYCLES_COUNTER_VIDEO) + 8;
2444:
2445: /* Find 'line' into palette - screen starts 63 lines down, less 29 for top overscan */
1.1.1.15 root 2446: Video_ConvertPosition ( FrameCycles , &HblCounterVideo , &LineCycles );
2447: Line = HblCounterVideo - nFirstVisibleHbl;
1.1.1.11 root 2448:
2449: /* FIXME [NP] if the color change occurs after the last visible pixel of a line */
2450: /* we consider the palette should be modified on the next line. This is quite */
2451: /* a hack, we should handle all color changes through spec512.c to have cycle */
2452: /* accuracy all the time. */
1.1.1.15 root 2453: if ( LineCycles >= LINE_END_CYCLE_NO_RIGHT )
2454: Line++;
1.1.1.11 root 2455:
2456: if (Line < 0) /* Limit to top/bottom of possible visible screen */
2457: Line = 0;
2458: if (Line >= NUM_VISIBLE_LINES)
2459: Line = NUM_VISIBLE_LINES-1;
2460:
2461: /* Store pointers */
2462: pHBLPaletteMasks = &HBLPaletteMasks[Line]; /* Next mask entry */
2463: pHBLPalettes = &HBLPalettes[16*Line]; /* Next colour raster list x16 colours */
1.1 root 2464: }
1.1.1.8 root 2465:
2466:
1.1.1.9 root 2467: /*-----------------------------------------------------------------------*/
1.1.1.11 root 2468: /**
2469: * Set video shifter timing variables according to screen refresh rate.
2470: * Note: The following equation must be satisfied for correct timings:
2471: *
2472: * nCyclesPerLine * nScanlinesPerFrame * nScreenRefreshRate = 8 MHz
2473: */
1.1.1.10 root 2474: static void Video_ResetShifterTimings(void)
2475: {
1.1.1.11 root 2476: Uint8 nSyncByte;
1.1.1.10 root 2477:
1.1.1.11 root 2478: nSyncByte = IoMem_ReadByte(0xff820a);
1.1.1.10 root 2479:
1.1.1.19 root 2480: if ((IoMem_ReadByte(0xff8260) & 3) == 2)
1.1.1.11 root 2481: {
2482: /* 71 Hz, monochrome */
2483: nScreenRefreshRate = 71;
2484: nScanlinesPerFrame = SCANLINES_PER_FRAME_71HZ;
2485: nCyclesPerLine = CYCLES_PER_LINE_71HZ;
1.1.1.13 root 2486: nStartHBL = VIDEO_START_HBL_71HZ;
1.1.1.11 root 2487: nFirstVisibleHbl = FIRST_VISIBLE_HBL_71HZ;
1.1.1.13 root 2488: nLastVisibleHbl = FIRST_VISIBLE_HBL_71HZ + VIDEO_HEIGHT_HBL_MONO;
1.1.1.11 root 2489: }
2490: else if (nSyncByte & 2) /* Check if running in 50 Hz or in 60 Hz */
2491: {
2492: /* 50 Hz */
2493: nScreenRefreshRate = 50;
2494: nScanlinesPerFrame = SCANLINES_PER_FRAME_50HZ;
2495: nCyclesPerLine = CYCLES_PER_LINE_50HZ;
1.1.1.13 root 2496: nStartHBL = VIDEO_START_HBL_50HZ;
1.1.1.11 root 2497: nFirstVisibleHbl = FIRST_VISIBLE_HBL_50HZ;
1.1.1.13 root 2498: nLastVisibleHbl = FIRST_VISIBLE_HBL_50HZ + NUM_VISIBLE_LINES;
1.1.1.11 root 2499: }
2500: else
2501: {
2502: /* 60 Hz */
2503: nScreenRefreshRate = 60;
2504: nScanlinesPerFrame = SCANLINES_PER_FRAME_60HZ;
2505: nCyclesPerLine = CYCLES_PER_LINE_60HZ;
1.1.1.13 root 2506: nStartHBL = VIDEO_START_HBL_60HZ;
1.1.1.11 root 2507: nFirstVisibleHbl = FIRST_VISIBLE_HBL_60HZ;
1.1.1.13 root 2508: nLastVisibleHbl = FIRST_VISIBLE_HBL_60HZ + NUM_VISIBLE_LINES;
1.1.1.11 root 2509: }
2510:
2511: if (bUseHighRes)
2512: {
1.1.1.13 root 2513: nEndHBL = nStartHBL + VIDEO_HEIGHT_HBL_MONO;
1.1.1.11 root 2514: }
2515: else
2516: {
1.1.1.13 root 2517: nEndHBL = nStartHBL + VIDEO_HEIGHT_HBL_COLOR;
1.1.1.11 root 2518: }
2519:
2520: /* Reset freq changes position for the next VBL to come */
1.1.1.13 root 2521: LastCycleScroll8264 = -1;
2522: LastCycleScroll8265 = -1;
1.1.1.15 root 2523:
2524: TimerBEventCountCycleStart = -1; /* reset timer B activation cycle for this VBL */
2525:
1.1.1.18 root 2526: BlankLines = 0;
1.1.1.11 root 2527: }
1.1.1.10 root 2528:
2529:
1.1.1.11 root 2530: /*-----------------------------------------------------------------------*/
2531: /**
1.1.1.15 root 2532: * Clear the array indicating the state of each video line.
1.1.1.11 root 2533: */
1.1.1.15 root 2534: static void Video_InitShifterLines ( void )
1.1.1.11 root 2535: {
1.1.1.15 root 2536: int i;
2537:
2538: for ( i=0 ; i<MAX_SCANLINES_PER_FRAME ; i++ )
2539: {
2540: ShifterFrame.ShifterLines[i].BorderMask = 0;
2541: ShifterFrame.ShifterLines[i].DisplayPixelShift = 0;
2542: ShifterFrame.ShifterLines[i].DisplayStartCycle = -1;
2543: }
2544:
2545: ShifterFrame.ShifterLines[0].StartCycle = 0; /* 1st HBL starts at cycle 0 */
1.1.1.10 root 2546: }
2547:
2548:
2549: /*-----------------------------------------------------------------------*/
1.1.1.11 root 2550: /**
2551: * Called on VBL, set registers ready for frame
2552: */
1.1.1.9 root 2553: static void Video_ClearOnVBL(void)
2554: {
1.1.1.11 root 2555: /* New screen, so first HBL */
2556: nHBL = 0;
2557: OverscanMode = OVERSCANMODE_NONE;
2558:
2559: Video_ResetShifterTimings();
2560:
2561: /* Get screen address pointer, aligned to 256 bytes on ST (ie ignore lowest byte) */
2562: VideoBase = (Uint32)IoMem_ReadByte(0xff8201)<<16 | (Uint32)IoMem_ReadByte(0xff8203)<<8;
2563: if (ConfigureParams.System.nMachineType != MACHINE_ST)
2564: {
1.1.1.20 root 2565: /* on STe 2 aligned, on TT 8 aligned. We do STe. */
1.1.1.11 root 2566: VideoBase |= IoMem_ReadByte(0xff820d) & ~1;
2567: }
2568: pVideoRaster = &STRam[VideoBase];
2569: pSTScreen = pFrameBuffer->pSTScreen;
2570:
2571: Video_SetScreenRasters();
1.1.1.15 root 2572: Video_InitShifterLines();
1.1.1.11 root 2573: Spec512_StartVBL();
1.1.1.15 root 2574: Video_StartHBL(); /* Init ShifterFrame.ShifterLines[0] */
1.1.1.11 root 2575: }
2576:
2577:
2578: /*-----------------------------------------------------------------------*/
2579: /**
2580: * Get width, height and bpp according to TT-Resolution
2581: */
2582: void Video_GetTTRes(int *width, int *height, int *bpp)
2583: {
2584: switch (TTRes)
2585: {
2586: case ST_LOW_RES: *width = 320; *height = 200; *bpp = 4; break;
2587: case ST_MEDIUM_RES:*width = 640; *height = 200; *bpp = 2; break;
2588: case ST_HIGH_RES: *width = 640; *height = 400; *bpp = 1; break;
2589: case TT_LOW_RES: *width = 320; *height = 480; *bpp = 8; break;
2590: case TT_MEDIUM_RES:*width = 640; *height = 480; *bpp = 4; break;
2591: case TT_HIGH_RES: *width = 1280; *height = 960; *bpp = 1; break;
2592: default:
2593: fprintf(stderr, "TT res error!\n");
2594: *width = 320; *height = 200; *bpp = 4;
2595: break;
2596: }
2597: }
2598:
2599:
2600: /*-----------------------------------------------------------------------*/
2601: /**
2602: * Convert TT palette to SDL palette
2603: */
2604: static void Video_UpdateTTPalette(int bpp)
2605: {
2606: Uint32 ttpalette, src, dst;
2607: Uint8 r,g,b, lowbyte, highbyte;
2608: Uint16 stcolor, ttcolor;
2609: int i, offset, colors;
2610:
2611: ttpalette = 0xff8400;
2612:
2613: if (!bTTColorsSTSync)
2614: {
2615: /* sync TT ST-palette to TT-palette */
2616: src = 0xff8240; /* ST-palette */
2617: offset = (IoMem_ReadWord(0xff8262) & 0x0f);
1.1.1.13 root 2618: /*fprintf(stderr, "offset: %d\n", offset);*/
1.1.1.11 root 2619: dst = ttpalette + offset * 16*SIZE_WORD;
2620:
2621: for (i = 0; i < 16; i++)
2622: {
2623: stcolor = IoMem_ReadWord(src);
1.1.1.21! root 2624: ttcolor = ((stcolor&0x777) << 1) | ((stcolor&0x888) >> 3);
1.1.1.11 root 2625: IoMem_WriteWord(dst, ttcolor);
2626: src += SIZE_WORD;
2627: dst += SIZE_WORD;
2628: }
1.1.1.15 root 2629: bTTColorsSTSync = true;
1.1.1.11 root 2630: }
2631:
2632: colors = 1 << bpp;
1.1.1.21! root 2633: if ((bpp == 1) && (TTRes == TT_HIGH_RES))
1.1.1.11 root 2634: {
2635: /* Monochrome mode... palette is hardwired (?) */
2636: HostScreen_setPaletteColor(0, 255, 255, 255);
2637: HostScreen_setPaletteColor(1, 0, 0, 0);
2638: }
1.1.1.21! root 2639: else if (bpp == 1)
! 2640: {
! 2641: /* Monochrome mode... palette is taken from first and last TT color */
! 2642: ttpalette = 0xff8400;
! 2643: lowbyte = IoMem_ReadByte(ttpalette++);
! 2644: highbyte = IoMem_ReadByte(ttpalette++);
! 2645: r = (lowbyte & 0x0f) << 4;
! 2646: g = (highbyte & 0xf0);
! 2647: b = (highbyte & 0x0f) << 4;
! 2648: //printf("%d: (%d,%d,%d)\n", 0,r,g,b);
! 2649: if(bTTHypermono)
! 2650: {
! 2651: r = g = b = highbyte;
! 2652: }
! 2653: HostScreen_setPaletteColor(0, r,g,b);
! 2654:
! 2655: ttpalette = 0xff85fe;
! 2656: lowbyte = IoMem_ReadByte(ttpalette++);
! 2657: highbyte = IoMem_ReadByte(ttpalette++);
! 2658: r = (lowbyte & 0x0f) << 4;
! 2659: g = (highbyte & 0xf0);
! 2660: b = (highbyte & 0x0f) << 4;
! 2661: if(bTTHypermono)
! 2662: {
! 2663: r = g = b = highbyte;
! 2664: }
! 2665: //printf("%d: (%d,%d,%d)\n", 1,r,g,b);
! 2666: HostScreen_setPaletteColor(1, r,g,b);
! 2667:
! 2668: }
1.1.1.11 root 2669: else
2670: {
2671: for (i = 0; i < colors; i++)
2672: {
2673: lowbyte = IoMem_ReadByte(ttpalette++);
2674: highbyte = IoMem_ReadByte(ttpalette++);
2675: r = (lowbyte & 0x0f) << 4;
2676: g = (highbyte & 0xf0);
2677: b = (highbyte & 0x0f) << 4;
2678: //printf("%d: (%d,%d,%d)\n", i,r,g,b);
1.1.1.21! root 2679: if(bTTHypermono)
! 2680: {
! 2681: r = g = b = highbyte;
! 2682: }
1.1.1.11 root 2683: HostScreen_setPaletteColor(i, r,g,b);
2684: }
2685: }
2686:
2687: HostScreen_updatePalette(colors);
1.1.1.15 root 2688: bTTColorsSync = true;
1.1.1.11 root 2689: }
2690:
2691:
2692: /*-----------------------------------------------------------------------*/
2693: /**
1.1.1.13 root 2694: * Update TT palette and blit TT screen using VIDEL code.
2695: * @return true if the screen contents changed
1.1.1.11 root 2696: */
1.1.1.16 root 2697: bool Video_RenderTTScreen(void)
1.1.1.11 root 2698: {
2699: static int nPrevTTRes = -1;
2700: int width, height, bpp;
2701:
2702: Video_GetTTRes(&width, &height, &bpp);
2703: if (TTRes != nPrevTTRes)
2704: {
2705: HostScreen_setWindowSize(width, height, 8);
2706: nPrevTTRes = TTRes;
2707: if (bpp == 1) /* Assert that mono palette will be used in mono mode */
1.1.1.15 root 2708: bTTColorsSync = false;
1.1.1.11 root 2709: }
2710:
2711: /* colors need synching? */
2712: if (!(bTTColorsSync && bTTColorsSTSync))
2713: {
2714: Video_UpdateTTPalette(bpp);
2715: }
1.1.1.21! root 2716: else if (TTSpecialVideoMode != nPrevTTSpecialVideoMode)
! 2717: {
! 2718: Video_UpdateTTPalette(bpp);
! 2719: nPrevTTSpecialVideoMode = TTSpecialVideoMode;
! 2720: }
1.1.1.11 root 2721:
2722: /* Yes, we are abusing the Videl routines for rendering the TT modes! */
2723: if (!HostScreen_renderBegin())
1.1.1.13 root 2724: return false;
1.1.1.16 root 2725: if (nScreenZoomX * nScreenZoomY != 1)
1.1.1.11 root 2726: VIDEL_ConvertScreenZoom(width, height, bpp, width * bpp / 16);
2727: else
2728: VIDEL_ConvertScreenNoZoom(width, height, bpp, width * bpp / 16);
2729: HostScreen_renderEnd();
1.1.1.15 root 2730: HostScreen_update1(false);
1.1.1.13 root 2731:
2732: return true;
1.1.1.11 root 2733: }
2734:
2735:
2736: /*-----------------------------------------------------------------------*/
2737: /**
2738: * Draw screen (either with ST/STE shifter drawing functions or with
2739: * Videl drawing functions)
2740: */
2741: static void Video_DrawScreen(void)
2742: {
2743: /* Skip frame if need to */
1.1.1.13 root 2744: if (nVBLs % (nFrameSkips+1))
1.1.1.11 root 2745: return;
2746:
2747: /* Use extended VDI resolution?
2748: * If so, just copy whole screen on VBL rather than per HBL */
2749: if (bUseVDIRes)
2750: Video_CopyVDIScreen();
2751:
2752: /* Now draw the screen! */
2753: if (ConfigureParams.System.nMachineType == MACHINE_FALCON && !bUseVDIRes)
2754: {
1.1.1.17 root 2755: VIDEL_renderScreen();
1.1.1.11 root 2756: }
2757: else if (ConfigureParams.System.nMachineType == MACHINE_TT && !bUseVDIRes)
2758: {
1.1.1.17 root 2759: Video_RenderTTScreen();
1.1.1.11 root 2760: }
2761: else
1.1.1.13 root 2762: {
2763: /* Before drawing the screen, ensure all unused lines are cleared to color 0 */
2764: /* (this can happen in 60 Hz when hatari is displaying the screen's border) */
2765: /* pSTScreen was set during Video_CopyScreenLineColor */
1.1.1.14 root 2766: if (!bUseVDIRes && nHBL < nLastVisibleHbl)
1.1.1.13 root 2767: memset(pSTScreen, 0, SCREENBYTES_LINE * ( nLastVisibleHbl - nHBL ) );
2768:
1.1.1.17 root 2769: Screen_Draw();
1.1.1.13 root 2770: }
1.1.1.11 root 2771: }
2772:
2773:
2774: /*-----------------------------------------------------------------------*/
2775: /**
1.1.1.15 root 2776: * Start HBL, Timer B and VBL interrupts.
2777: */
2778:
2779:
2780: /**
2781: * Start HBL or Timer B interrupt at position Pos. If position Pos was
2782: * already reached, then the interrupt is set on the next line.
2783: */
2784:
2785: static void Video_AddInterrupt ( int Pos , interrupt_id Handler )
2786: {
2787: int FrameCycles , HblCounterVideo , LineCycles;
2788:
2789: if ( nHBL >= nScanlinesPerFrame )
2790: return; /* don't set a new hbl/timer B if we're on the last line, as the vbl will happen first */
2791:
2792: Video_GetPosition ( &FrameCycles , &HblCounterVideo , &LineCycles );
1.1.1.16 root 2793: //fprintf ( stderr , "add int pos=%d handler=%d LineCycles=%d nCyclesPerLine=%d \n" , Pos , Handler , LineCycles , nCyclesPerLine );
1.1.1.15 root 2794:
2795: if ( LineCycles < Pos ) /* changed before reaching the new Pos on the current line */
1.1.1.16 root 2796: CycInt_AddRelativeInterrupt ( Pos - LineCycles , INT_CPU_CYCLE, Handler );
1.1.1.15 root 2797: else /* Pos will be applied on next line */
1.1.1.16 root 2798: CycInt_AddRelativeInterrupt ( Pos - LineCycles + nCyclesPerLine , INT_CPU_CYCLE, Handler );
1.1.1.15 root 2799: }
2800:
2801:
2802: static void Video_AddInterruptHBL ( int Pos )
2803: {
1.1.1.16 root 2804: //fprintf ( stderr , "add hbl pos=%d\n" , Pos );
1.1.1.15 root 2805: if ( !bUseVDIRes )
2806: Video_AddInterrupt ( Pos , INTERRUPT_VIDEO_HBL );
2807: }
2808:
2809:
2810: void Video_AddInterruptTimerB ( int Pos )
2811: {
1.1.1.16 root 2812: //fprintf ( stderr , "add timerb pos=%d\n" , Pos );
1.1.1.15 root 2813: if ( !bUseVDIRes )
2814: Video_AddInterrupt ( Pos , INTERRUPT_VIDEO_ENDLINE );
2815: }
2816:
2817:
2818: /**
2819: * Add some video interrupts to handle the first HBL and the first Timer B
2820: * in a new VBL. Also add an interrupt to trigger the next VBL.
2821: * This function is called from the VBL, so we use PendingCycleOver to take into account
2822: * the possible delay occurring when the VBL was executed.
1.1.1.16 root 2823: * In monochrome mode (71 Hz) a line is 224 cycles, which means if VBL is delayed
2824: * by a DIVS, FrameCycles can already be > 224 and we need to add an immediate
2825: * interrupt for hbl/timer in the next 4/8 cycles (else crash might happen as
2826: * line 0 processing would be skipped).
1.1.1.11 root 2827: */
1.1.1.15 root 2828: void Video_StartInterrupts ( int PendingCyclesOver )
1.1.1.11 root 2829: {
1.1.1.16 root 2830: int FrameCycles , HblCounterVideo , LineCycles;
2831: int Pos;
2832:
1.1.1.15 root 2833: /* HBL/Timer B are not emulated in VDI mode */
1.1.1.14 root 2834: if (!bUseVDIRes)
2835: {
1.1.1.16 root 2836: Video_GetPosition ( &FrameCycles , &HblCounterVideo , &LineCycles );
1.1.1.15 root 2837:
1.1.1.16 root 2838: /* Set Timer B interrupt for line 0 */
2839: Pos = Video_TimerB_GetPos ( 0 );
2840: if ( Pos > FrameCycles ) /* check Pos for line 0 was not already reached */
2841: Video_AddInterruptTimerB ( Pos );
2842: else /* the VBL was delayed by more than 1 HBL, add an immediate timer B */
2843: {
2844: LOG_TRACE(TRACE_VIDEO_VBL , "VBL %d delayed too much video_cyc=%d >= pos=%d for first timer B, add immediate timer B\n" ,
2845: nVBLs , FrameCycles , Pos );
2846: CycInt_AddRelativeInterrupt ( 4 , INT_CPU_CYCLE, INTERRUPT_VIDEO_ENDLINE );
2847: }
2848:
2849: /* Set HBL interrupt for line 0 */
2850: Pos = Video_HBL_GetPos();
2851: if ( Pos > FrameCycles ) /* check Pos for line 0 was not already reached */
2852: Video_AddInterruptHBL ( Pos );
2853: else /* the VBL was delayed by more than 1 HBL, add an immediate HBL */
2854: {
2855: LOG_TRACE(TRACE_VIDEO_VBL , "VBL %d delayed too much video_cyc=%d >= pos=%d for first HBL, add immediate HBL\n" ,
2856: nVBLs , FrameCycles , Pos );
2857: CycInt_AddRelativeInterrupt ( 8 , INT_CPU_CYCLE, INTERRUPT_VIDEO_HBL ); /* use 8 instead of 4 to happen after immediate timer b */
2858: }
1.1.1.14 root 2859: }
1.1.1.15 root 2860:
2861: /* TODO replace CYCLES_PER_FRAME */
1.1.1.16 root 2862: CyclesPerVBL = CYCLES_PER_FRAME;
1.1.1.18 root 2863: /* Note: Refresh rate less than 50 Hz does not make sense! */
2864: assert(CyclesPerVBL <= CPU_FREQ/49);
2865: /* Add new VBL interrupt: */
1.1.1.16 root 2866: CycInt_AddRelativeInterrupt(CyclesPerVBL - PendingCyclesOver, INT_CPU_CYCLE, INTERRUPT_VIDEO_VBL);
1.1.1.11 root 2867: }
2868:
2869:
2870: /*-----------------------------------------------------------------------*/
2871: /**
1.1.1.15 root 2872: * VBL interrupt : set new interrupts, draw screen, generate sound,
2873: * reset counters, ...
1.1.1.11 root 2874: */
1.1.1.15 root 2875: void Video_InterruptHandler_VBL ( void )
1.1.1.11 root 2876: {
2877: int PendingCyclesOver;
1.1.1.9 root 2878:
1.1.1.21! root 2879: /* Store cycles we went over for this frame(this is our initial count) */
1.1.1.11 root 2880: PendingCyclesOver = -INT_CONVERT_FROM_INTERNAL ( PendingInterruptCount , INT_CPU_CYCLE ); /* +ve */
1.1.1.10 root 2881:
1.1.1.11 root 2882: /* Remove this interrupt from list and re-order */
1.1.1.16 root 2883: CycInt_AcknowledgeInterrupt();
1.1.1.9 root 2884:
1.1.1.14 root 2885: /* Increment the vbl jitter index */
2886: VblJitterIndex++;
1.1.1.20 root 2887: VblJitterIndex %= VBL_JITTER_ARRAY_SIZE;
1.1.1.14 root 2888:
1.1.1.11 root 2889: /* Set frame cycles, used for Video Address */
1.1.1.13 root 2890: Cycles_SetCounter(CYCLES_COUNTER_VIDEO, PendingCyclesOver + VblVideoCycleOffset);
1.1.1.9 root 2891:
1.1.1.11 root 2892: /* Clear any key presses which are due to be de-bounced (held for one ST frame) */
2893: Keymap_DebounceAllKeys();
1.1.1.9 root 2894:
1.1.1.11 root 2895: Video_DrawScreen();
1.1.1.9 root 2896:
1.1.1.11 root 2897: /* Check printer status */
2898: Printer_CheckIdleStatus();
2899:
2900: /* Update counter for number of screen refreshes per second */
2901: nVBLs++;
2902: /* Set video registers for frame */
2903: Video_ClearOnVBL();
1.1.1.15 root 2904:
1.1.1.17 root 2905: /* Videl Vertical counter reset (To be removed when Videl emulation is finished) */
2906: if (ConfigureParams.System.nMachineType == MACHINE_FALCON) {
2907: vfc_counter = 0;
2908: }
2909:
1.1.1.15 root 2910: /* Since we don't execute HBL functions in VDI mode, we've got to
2911: * initialize the first HBL palette here when VDI mode is enabled. */
2912: if (bUseVDIRes)
2913: Video_StoreFirstLinePalette();
2914:
2915: /* Start VBL, HBL and Timer B interrupts (this must be done after resetting
2916: * video cycle counter setting default freq values in Video_ClearOnVBL) */
2917: Video_StartInterrupts(PendingCyclesOver);
2918:
2919: /* Act on shortcut keys */
2920: ShortCut_ActKey();
2921:
1.1.1.21! root 2922: /* Update the IKBD's internal clock */
! 2923: IKBD_UpdateClockOnVBL ();
! 2924:
1.1.1.16 root 2925: /* Record video frame is necessary */
2926: if ( bRecordingAvi )
2927: Avi_RecordVideoStream ();
2928:
1.1.1.11 root 2929: /* Store off PSG registers for YM file, is enabled */
2930: YMFormat_UpdateRecording();
2931: /* Generate 1/50th second of sound sample data, to be played by sound thread */
2932: Sound_Update_VBL();
2933:
1.1.1.15 root 2934: LOG_TRACE(TRACE_VIDEO_VBL , "VBL %d video_cyc=%d pending_cyc=%d jitter=%d\n" ,
1.1.1.14 root 2935: nVBLs , Cycles_GetCounter(CYCLES_COUNTER_VIDEO) , PendingCyclesOver , VblJitterArray[ VblJitterIndex ] );
1.1.1.11 root 2936:
1.1.1.21! root 2937: /* Print traces if pending VBL bit changed just before IACK when VBL interrupt is allowed */
! 2938: if ( ( CPU_IACK == true ) && ( regs.intmask < 4 ) )
! 2939: {
! 2940: if ( pendingInterrupts & ( 1 << 4 ) )
! 2941: {
! 2942: LOG_TRACE ( TRACE_VIDEO_VBL , "VBL %d, pending set again just before iack, skip one VBL interrupt video_cyc=%d pending_cyc=%d jitter=%d\n" ,
! 2943: nVBLs , Cycles_GetCounter(CYCLES_COUNTER_VIDEO) , PendingCyclesOver , VblJitterArray[ VblJitterIndex ] );
! 2944: }
! 2945: else
! 2946: {
! 2947: LOG_TRACE ( TRACE_VIDEO_VBL , "VBL %d, new pending VBL set just before iack video_cyc=%d pending_cyc=%d jitter=%d\n" ,
! 2948: nVBLs , Cycles_GetCounter(CYCLES_COUNTER_VIDEO) , PendingCyclesOver , VblJitterArray[ VblJitterIndex ] );
! 2949: }
! 2950: }
! 2951:
! 2952: /* Set pending bit for VBL interrupt in the CPU IPL */
! 2953: M68000_Exception(EXCEPTION_VBLANK, M68000_EXC_SRC_AUTOVEC); /* Vertical blank interrupt, level 4 */
1.1.1.11 root 2954:
2955: Main_WaitOnVbl();
1.1.1.9 root 2956: }
2957:
2958:
2959: /*-----------------------------------------------------------------------*/
1.1.1.11 root 2960: /**
1.1.1.13 root 2961: * Write to video address base high, med and low register (0xff8201/03/0d).
2962: * On STE, when a program writes to high or med registers, base low register
2963: * is reset to zero.
1.1.1.11 root 2964: */
1.1.1.9 root 2965: void Video_ScreenBaseSTE_WriteByte(void)
2966: {
1.1.1.13 root 2967: if ( ( IoAccessCurrentAddress == 0xff8201 ) || ( IoAccessCurrentAddress == 0xff8203 ) )
2968: IoMem[0xff820d] = 0; /* Reset screen base low register */
1.1.1.8 root 2969:
1.1.1.15 root 2970: if (LOG_TRACE_LEVEL(TRACE_VIDEO_STE))
1.1.1.11 root 2971: {
1.1.1.15 root 2972: int FrameCycles, HblCounterVideo, LineCycles;
2973:
2974: Video_GetPosition_OnWriteAccess ( &FrameCycles , &HblCounterVideo , &LineCycles );
2975:
2976: 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 2977: (IoMem[0xff8201]<<16)+(IoMem[0xff8203]<<8)+IoMem[0xff820d] ,
1.1.1.15 root 2978: FrameCycles, LineCycles, nHBL, HblCounterVideo, M68000_GetPC(), CurrentInstrCycles );
1.1.1.11 root 2979: }
1.1.1.8 root 2980: }
2981:
2982: /*-----------------------------------------------------------------------*/
1.1.1.11 root 2983: /**
2984: * Read video address counter and update ff8205/07/09
2985: */
2986: void Video_ScreenCounter_ReadByte(void)
1.1.1.8 root 2987: {
1.1.1.11 root 2988: Uint32 addr;
1.1.1.8 root 2989:
1.1.1.11 root 2990: addr = Video_CalculateAddress(); /* get current video address */
2991: IoMem[0xff8205] = ( addr >> 16 ) & 0xff;
2992: IoMem[0xff8207] = ( addr >> 8 ) & 0xff;
2993: IoMem[0xff8209] = addr & 0xff;
1.1.1.8 root 2994: }
2995:
1.1.1.9 root 2996: /*-----------------------------------------------------------------------*/
1.1.1.11 root 2997: /**
2998: * Write to video address counter (0xff8205, 0xff8207 and 0xff8209).
2999: * Called on STE only and like with base address, you cannot set lowest bit.
1.1.1.16 root 3000: *
3001: * As Hatari processes/converts one complete video line at a time, we have 3 cases :
3002: * - If display has not started yet for this line (left border), we can change pVideoRaster now.
3003: * We must take into account that the MMU starts 16 cycles earlier when hscroll is used.
3004: * - If display has stopped for this line (right border), we will change pVideoRaster
3005: * in Video_CopyScreenLineColor using pVideoRasterDelayed once the line has been processed.
3006: * - If the write is made while display is on, then we must compute an offset of what
3007: * the new address should have been, to correctly emulate the video address at the
3008: * end of the line while taking into account the fact that the video pointer is incrementing
3009: * during the active part of the line (this is the most "tricky" case)
3010: *
3011: * 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 3012: */
1.1.1.9 root 3013: void Video_ScreenCounter_WriteByte(void)
3014: {
1.1.1.11 root 3015: Uint8 AddrByte;
1.1.1.16 root 3016: Uint32 addr_cur;
3017: Uint32 addr_new = 0;
1.1.1.15 root 3018: int FrameCycles, HblCounterVideo, LineCycles;
1.1.1.13 root 3019: int Delayed;
1.1.1.16 root 3020: int MMUStartCycle;
1.1.1.11 root 3021:
1.1.1.15 root 3022: Video_GetPosition_OnWriteAccess ( &FrameCycles , &HblCounterVideo , &LineCycles );
1.1.1.11 root 3023:
3024: AddrByte = IoMem[ IoAccessCurrentAddress ];
3025:
1.1.1.16 root 3026: /* Get current video address from the shifter */
3027: addr_cur = Video_CalculateAddress();
3028: /* Correct the address in case a modification of ff8205/07/09 was already delayed */
3029: addr_new = addr_cur + VideoCounterDelayedOffset;
3030: /* Correct the address in case video counter was already modified in the right border */
3031: if ( pVideoRasterDelayed != NULL )
3032: addr_new = pVideoRasterDelayed - STRam;
3033:
3034: /* addr_new should now be the same as on a real STE */
3035: /* Compute the new video address with one modified byte */
3036: if ( IoAccessCurrentAddress == 0xff8205 )
1.1.1.20 root 3037: addr_new = ( addr_new & 0x00ffff ) | ( ( AddrByte & 0x3f ) << 16 );
1.1.1.16 root 3038: else if ( IoAccessCurrentAddress == 0xff8207 )
3039: addr_new = ( addr_new & 0xff00ff ) | ( AddrByte << 8 );
3040: else if ( IoAccessCurrentAddress == 0xff8209 )
3041: addr_new = ( addr_new & 0xffff00 ) | ( AddrByte );
3042:
3043: MMUStartCycle = Video_GetMMUStartCycle ( ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle );
3044:
1.1.1.11 root 3045: /* If display has not started, we can still modify pVideoRaster */
1.1.1.16 root 3046: /* We must also check the write does not overlap the end of the line (to be sure Video_EndHBL is called first) */
3047: if ( ( ( LineCycles <= MMUStartCycle ) && ( nHBL == HblCounterVideo ) )
1.1.1.18 root 3048: || ( nHBL < nStartHBL ) || ( nHBL >= nEndHBL + BlankLines ) )
1.1.1.11 root 3049: {
1.1.1.16 root 3050: pVideoRaster = &STRam[addr_new & ~1]; /* set new video address */
3051: VideoCounterDelayedOffset = 0;
3052: pVideoRasterDelayed = NULL;
1.1.1.15 root 3053: Delayed = false;
1.1.1.11 root 3054: }
3055:
1.1.1.16 root 3056: /* Display is OFF (right border) but we can't change pVideoRaster now, we must process Video_CopyScreenLineColor first */
1.1.1.18 root 3057: else if ( ( nHBL >= nStartHBL ) && ( nHBL < nEndHBL + BlankLines ) /* line should be active */
1.1.1.16 root 3058: && ( ( LineCycles > ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle ) /* we're in the right border */
3059: || ( HblCounterVideo == nHBL+1 ) ) ) /* or the write overlaps the next line and Video_EndHBL was not called yet */
3060: {
3061: VideoCounterDelayedOffset = 0;
3062: pVideoRasterDelayed = &STRam[addr_new & ~1]; /* new value for pVideoRaster at the end of Video_CopyScreenLineColor */
3063: Delayed = true;
3064: }
3065:
3066: /* Counter is modified while display is ON, store the bytes offset for Video_CopyScreenLineColor */
3067: /* Even on a real STE, modifying video address in this case will cause artefacts */
1.1.1.11 root 3068: else
3069: {
1.1.1.16 root 3070: VideoCounterDelayedOffset = addr_new - addr_cur;
3071: pVideoRasterDelayed = NULL;
1.1.1.15 root 3072: Delayed = true;
1.1.1.11 root 3073: }
3074:
1.1.1.16 root 3075: LOG_TRACE(TRACE_VIDEO_STE , "write ste video %x val=0x%x video_old=%x video_new=%x offset=%x delayed=%s"
3076: " video_cyc_w=%d line_cyc_w=%d @ nHBL=%d/video_hbl_w=%d pc=%x instr_cyc=%d\n" ,
3077: IoAccessCurrentAddress, AddrByte, addr_cur , addr_new , VideoCounterDelayedOffset , Delayed ? "yes" : "no" ,
1.1.1.15 root 3078: FrameCycles, LineCycles, nHBL, HblCounterVideo, M68000_GetPC(), CurrentInstrCycles );
1.1.1.9 root 3079: }
1.1.1.8 root 3080:
3081: /*-----------------------------------------------------------------------*/
1.1.1.11 root 3082: /**
3083: * Read video sync register (0xff820a)
3084: */
1.1.1.8 root 3085: void Video_Sync_ReadByte(void)
3086: {
1.1.1.17 root 3087: if ( (ConfigureParams.System.nMachineType == MACHINE_ST)
3088: || (ConfigureParams.System.nMachineType == MACHINE_STE)
3089: || (ConfigureParams.System.nMachineType == MACHINE_MEGA_STE) )
1.1.1.14 root 3090: IoMem[0xff820a] |= 0xfc; /* set unused bits 2-7 to 1 */
1.1.1.8 root 3091: }
3092:
3093: /*-----------------------------------------------------------------------*/
1.1.1.11 root 3094: /**
3095: * Read video base address low byte (0xff820d). A plain ST can only store
3096: * screen addresses rounded to 256 bytes (i.e. no lower byte).
3097: */
1.1.1.8 root 3098: void Video_BaseLow_ReadByte(void)
3099: {
1.1.1.11 root 3100: if (ConfigureParams.System.nMachineType == MACHINE_ST)
3101: IoMem[0xff820d] = 0; /* On ST this is always 0 */
1.1.1.9 root 3102:
1.1.1.11 root 3103: /* Note that you should not do anything here for STe because
3104: * VideoBase address is set in an interrupt and would be wrong
3105: * here. It's fine like this.
3106: */
1.1.1.8 root 3107: }
3108:
3109: /*-----------------------------------------------------------------------*/
1.1.1.11 root 3110: /**
3111: * Read video line width register (0xff820f)
3112: */
1.1.1.8 root 3113: void Video_LineWidth_ReadByte(void)
3114: {
1.1.1.11 root 3115: if (ConfigureParams.System.nMachineType == MACHINE_ST)
3116: IoMem[0xff820f] = 0; /* On ST this is always 0 */
1.1.1.18 root 3117:
3118: /* If we're not in STF mode, we use the value already stored in $ff820f */
1.1.1.8 root 3119: }
3120:
3121: /*-----------------------------------------------------------------------*/
1.1.1.11 root 3122: /**
3123: * Read video shifter mode register (0xff8260)
3124: */
1.1.1.8 root 3125: void Video_ShifterMode_ReadByte(void)
3126: {
1.1.1.11 root 3127: if (bUseHighRes)
1.1.1.14 root 3128: IoMem[0xff8260] = 2; /* If mono monitor, force to high resolution */
3129:
1.1.1.17 root 3130: if (ConfigureParams.System.nMachineType == MACHINE_ST)
3131: IoMem[0xff8260] |= 0xfc; /* On STF, set unused bits 2-7 to 1 */
1.1.1.20 root 3132: else
3133: IoMem[0xff8260] &= 0x03; /* Only use bits 0 and 1, unused bits 2-7 are set to 0 */
1.1.1.8 root 3134: }
3135:
1.1.1.10 root 3136: /*-----------------------------------------------------------------------*/
1.1.1.11 root 3137: /**
3138: * Read horizontal scroll register (0xff8265)
3139: */
1.1.1.10 root 3140: void Video_HorScroll_Read(void)
3141: {
1.1.1.11 root 3142: IoMem[0xff8265] = HWScrollCount;
1.1.1.10 root 3143: }
1.1.1.8 root 3144:
3145: /*-----------------------------------------------------------------------*/
1.1.1.11 root 3146: /**
3147: * Write video line width register (0xff820f) - STE only.
3148: * Content of LineWidth is added to the shifter counter when display is
3149: * turned off (start of the right border, usually at cycle 376)
3150: */
1.1.1.10 root 3151: void Video_LineWidth_WriteByte(void)
3152: {
1.1.1.11 root 3153: Uint8 NewWidth;
1.1.1.15 root 3154: int FrameCycles, HblCounterVideo, LineCycles;
1.1.1.13 root 3155: int Delayed;
1.1.1.11 root 3156:
1.1.1.15 root 3157: Video_GetPosition_OnWriteAccess ( &FrameCycles , &HblCounterVideo , &LineCycles );
1.1.1.11 root 3158:
3159: NewWidth = IoMem_ReadByte(0xff820f);
3160:
3161: /* We must also check the write does not overlap the end of the line */
1.1.1.15 root 3162: if ( ( ( nHBL == HblCounterVideo ) && ( LineCycles <= ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle ) )
1.1.1.18 root 3163: || ( nHBL < nStartHBL ) || ( nHBL >= nEndHBL + BlankLines ) )
1.1.1.13 root 3164: {
1.1.1.11 root 3165: LineWidth = NewWidth; /* display is on, we can still change */
1.1.1.13 root 3166: NewLineWidth = -1; /* cancel 'pending' change */
1.1.1.15 root 3167: Delayed = false;
1.1.1.13 root 3168: }
1.1.1.11 root 3169: else
1.1.1.13 root 3170: {
1.1.1.11 root 3171: NewLineWidth = NewWidth; /* display is off, can't change LineWidth once in right border */
1.1.1.15 root 3172: Delayed = true;
1.1.1.13 root 3173: }
1.1.1.11 root 3174:
1.1.1.15 root 3175: 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 3176: NewWidth, Delayed ? "yes" : "no" ,
1.1.1.15 root 3177: FrameCycles, LineCycles, nHBL, HblCounterVideo, M68000_GetPC(), CurrentInstrCycles );
1.1.1.10 root 3178: }
3179:
3180: /*-----------------------------------------------------------------------*/
1.1.1.11 root 3181: /**
3182: * Write to video shifter palette registers (0xff8240-0xff825e)
1.1.1.14 root 3183: *
3184: * Note that there's a special "strange" case when writing only to the upper byte
3185: * of the color reg (instead of writing 16 bits at once with .W/.L).
3186: * In that case, the byte written to address x is automatically written
3187: * to address x+1 too (but we shouldn't copy x in x+1 after masking x ; we apply the mask at the end)
3188: * So : move.w #0,$ff8240 -> color 0 is now $000
3189: * move.b #7,$ff8240 -> color 0 is now $707 !
3190: * move.b #$55,$ff8241 -> color 0 is now $755 ($ff8240 remains unchanged)
3191: * move.b #$71,$ff8240 -> color 0 is now $171 (bytes are first copied, then masked)
1.1.1.11 root 3192: */
1.1.1.8 root 3193: static void Video_ColorReg_WriteWord(Uint32 addr)
3194: {
1.1.1.15 root 3195: if (!bUseHighRes && !bUseVDIRes) /* Don't store if hi-res or VDI resolution */
1.1.1.11 root 3196: {
3197: int idx;
3198: Uint16 col;
3199: Video_SetHBLPaletteMaskPointers(); /* Set 'pHBLPalettes' etc.. according cycles into frame */
3200: col = IoMem_ReadWord(addr);
1.1.1.14 root 3201:
3202: /* Handle special case when writing only to the upper byte of the color reg */
3203: if ( ( nIoMemAccessSize == SIZE_BYTE ) && ( ( IoAccessCurrentAddress & 1 ) == 0 ) )
3204: col = ( IoMem_ReadByte(addr) << 8 ) + IoMem_ReadByte(addr); /* copy upper byte into lower byte */
3205:
1.1.1.11 root 3206: if (ConfigureParams.System.nMachineType == MACHINE_ST)
3207: col &= 0x777; /* Mask off to ST 512 palette */
3208: else
3209: col &= 0xfff; /* Mask off to STe 4096 palette */
3210: IoMem_WriteWord(addr, col); /* (some games write 0xFFFF and read back to see if STe) */
3211: Spec512_StoreCyclePalette(col, addr); /* Store colour into CyclePalettes[] */
3212: idx = (addr-0xff8240)/2; /* words */
3213: pHBLPalettes[idx] = col; /* Set colour x */
3214: *pHBLPaletteMasks |= 1 << idx; /* And mask */
3215:
1.1.1.15 root 3216: if (LOG_TRACE_LEVEL(TRACE_VIDEO_COLOR))
1.1.1.11 root 3217: {
1.1.1.15 root 3218: int FrameCycles, HblCounterVideo, LineCycles;
3219:
3220: Video_GetPosition_OnWriteAccess ( &FrameCycles , &HblCounterVideo , &LineCycles );
3221:
3222: 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" ,
3223: addr, col,
3224: FrameCycles, LineCycles, nHBL, HblCounterVideo, M68000_GetPC(), CurrentInstrCycles );
1.1.1.11 root 3225: }
3226:
3227: }
1.1.1.8 root 3228: }
3229:
3230: void Video_Color0_WriteWord(void)
3231: {
1.1.1.11 root 3232: Video_ColorReg_WriteWord(0xff8240);
1.1.1.8 root 3233: }
3234:
3235: void Video_Color1_WriteWord(void)
3236: {
1.1.1.11 root 3237: Video_ColorReg_WriteWord(0xff8242);
1.1.1.8 root 3238: }
3239:
3240: void Video_Color2_WriteWord(void)
3241: {
1.1.1.11 root 3242: Video_ColorReg_WriteWord(0xff8244);
1.1.1.8 root 3243: }
3244:
3245: void Video_Color3_WriteWord(void)
3246: {
1.1.1.11 root 3247: Video_ColorReg_WriteWord(0xff8246);
1.1.1.8 root 3248: }
3249:
3250: void Video_Color4_WriteWord(void)
3251: {
1.1.1.11 root 3252: Video_ColorReg_WriteWord(0xff8248);
1.1.1.8 root 3253: }
3254:
3255: void Video_Color5_WriteWord(void)
3256: {
1.1.1.11 root 3257: Video_ColorReg_WriteWord(0xff824a);
1.1.1.8 root 3258: }
3259:
3260: void Video_Color6_WriteWord(void)
3261: {
1.1.1.11 root 3262: Video_ColorReg_WriteWord(0xff824c);
1.1.1.8 root 3263: }
3264:
3265: void Video_Color7_WriteWord(void)
3266: {
1.1.1.11 root 3267: Video_ColorReg_WriteWord(0xff824e);
1.1.1.8 root 3268: }
3269:
3270: void Video_Color8_WriteWord(void)
3271: {
1.1.1.11 root 3272: Video_ColorReg_WriteWord(0xff8250);
1.1.1.8 root 3273: }
3274:
3275: void Video_Color9_WriteWord(void)
3276: {
1.1.1.11 root 3277: Video_ColorReg_WriteWord(0xff8252);
1.1.1.8 root 3278: }
3279:
3280: void Video_Color10_WriteWord(void)
3281: {
1.1.1.11 root 3282: Video_ColorReg_WriteWord(0xff8254);
1.1.1.8 root 3283: }
3284:
3285: void Video_Color11_WriteWord(void)
3286: {
1.1.1.11 root 3287: Video_ColorReg_WriteWord(0xff8256);
1.1.1.8 root 3288: }
3289:
3290: void Video_Color12_WriteWord(void)
3291: {
1.1.1.11 root 3292: Video_ColorReg_WriteWord(0xff8258);
1.1.1.8 root 3293: }
3294:
3295: void Video_Color13_WriteWord(void)
3296: {
1.1.1.11 root 3297: Video_ColorReg_WriteWord(0xff825a);
1.1.1.8 root 3298: }
3299:
3300: void Video_Color14_WriteWord(void)
3301: {
1.1.1.11 root 3302: Video_ColorReg_WriteWord(0xff825c);
1.1.1.8 root 3303: }
3304:
3305: void Video_Color15_WriteWord(void)
3306: {
1.1.1.11 root 3307: Video_ColorReg_WriteWord(0xff825e);
1.1.1.8 root 3308: }
3309:
3310:
3311: /*-----------------------------------------------------------------------*/
1.1.1.11 root 3312: /**
3313: * Write video shifter mode register (0xff8260)
3314: */
1.1.1.8 root 3315: void Video_ShifterMode_WriteByte(void)
3316: {
1.1.1.20 root 3317: Uint8 VideoShifterByte;
3318:
3319: if (ConfigureParams.System.nMachineType == MACHINE_TT)
3320: {
3321: TTRes = IoMem_ReadByte(0xff8260) & 7;
3322: /* Copy to TT shifter mode register: */
3323: IoMem_WriteByte(0xff8262, TTRes);
1.1.1.21! root 3324:
! 3325: bTTSampleHold = false;
! 3326: bTTHypermono = false;
1.1.1.20 root 3327: }
3328: else if (!bUseVDIRes) /* ST and STE mode */
1.1.1.11 root 3329: {
1.1.1.18 root 3330: /* We only care for lower 2-bits */
3331: VideoShifterByte = IoMem[0xff8260] & 3;
3332: /* 3 is not a valid resolution, use low res instead */
3333: if ( VideoShifterByte == 3 )
1.1.1.13 root 3334: {
3335: VideoShifterByte = 0;
3336: IoMem_WriteByte(0xff8260,0);
3337: }
1.1.1.18 root 3338:
1.1.1.11 root 3339: Video_WriteToShifter(VideoShifterByte);
3340: Video_SetHBLPaletteMaskPointers();
3341: *pHBLPaletteMasks &= 0xff00ffff;
3342: /* Store resolution after palette mask and set resolution write bit: */
3343: *pHBLPaletteMasks |= (((Uint32)VideoShifterByte|0x04)<<16);
3344: }
1.1.1.10 root 3345: }
3346:
3347: /*-----------------------------------------------------------------------*/
1.1.1.11 root 3348: /**
1.1.1.13 root 3349: * Handle horizontal scrolling to the left.
3350: * On STE, there're 2 registers that can scroll the line :
3351: * - $ff8264 : scroll without prefetch
1.1.1.14 root 3352: * - $ff8265 : scroll with prefetch
1.1.1.13 root 3353: * Both registers will scroll the line to the left by skipping the amount
3354: * of pixels in $ff8264 or $ff8265 (from 0 to 15).
3355: * As some pixels will be skipped, this means the shifter needs to read
3356: * 16 other pixels in advance in some internal registers to have an uninterrupted flow of pixels.
3357: *
1.1.1.14 root 3358: * These 16 pixels can be prefetched before the display starts (on cycle 56 for example) when using
1.1.1.13 root 3359: * $ff8265 to scroll the line. In that case 8 more bytes per line (low res) will be read. Most programs
3360: * are using $ff8265 to scroll the line.
3361: *
3362: * When using $ff8264, the next 16 pixels will not be prefetched before the display
3363: * starts, they will be read when the display normally starts (cycle 56). While
3364: * reading these 16 pixels, the shifter won't be able to display anything, which will
3365: * result in 16 pixels having the color 0. So, reading the 16 pixels will in fact delay
3366: * the real start of the line, which will look as if it started 16 pixels later. As the
3367: * shifter will stop the display at cycle 56+320 anyway, this means the last 16 pixels
3368: * of each line won't be displayed and you get the equivalent of a shorter 304 pixels line.
3369: * As a consequence, this register is rarely used to scroll the line.
3370: *
1.1.1.21! root 3371: * By writing a value > 0 in $ff8265 (to start prefetching) and immediately after a value of 0
1.1.1.13 root 3372: * in $ff8264 (no scroll and no prefetch), it's possible to fill the internal registers used
3373: * for the scrolling even if scrolling is set to 0. In that case, the shifter will start displaying
3374: * each line 16 pixels earlier (as the data are already available in the internal registers).
3375: * This allows to have 336 pixels per line (instead of 320) for all the remaining lines on the screen.
3376: *
3377: * Although some programs are using this sequence :
3378: * move.w #1,$ffff8264 ; Word access!
3379: * clr.b $ffff8264 ; Byte access!
3380: * It is also possible to add 16 pixels by doing :
3381: * move.b #X,$ff8265 ; with X > 0
3382: * move.b #0,$ff8264
1.1.1.11 root 3383: * Some games (Obsession, Skulls) and demos (Pacemaker by Paradox) use this
3384: * feature to increase the resolution, so we have to emulate this bug, too!
1.1.1.13 root 3385: *
3386: * So considering a low res line of 320 pixels (160 bytes) :
3387: * - if both $ff8264/65 are 0, no scrolling happens, the shifter reads 160 bytes and displays 320 pixels (same as STF)
3388: * - if $ff8265 > 0, line is scrolled, the shifter reads 168 bytes and displays 320 pixels.
3389: * - if $ff8264 > 0, line is scrolled, the shifter reads 160 bytes and displays 304 pixels,
3390: * the display starts 16 pixels later.
3391: * - if $ff8265 > 0 and then $ff8264 = 0, there's no scrolling, the shifter reads 168 bytes and displays 336 pixels,
3392: * the display starts 16 pixels earlier.
1.1.1.11 root 3393: */
1.1.1.13 root 3394:
3395: void Video_HorScroll_Write_8264(void)
3396: {
3397: Video_HorScroll_Write();
3398: }
3399:
3400: void Video_HorScroll_Write_8265(void)
3401: {
3402: Video_HorScroll_Write();
3403: }
3404:
1.1.1.10 root 3405: void Video_HorScroll_Write(void)
3406: {
1.1.1.13 root 3407: Uint32 RegAddr;
1.1.1.11 root 3408: Uint8 ScrollCount;
1.1.1.13 root 3409: Uint8 Prefetch;
1.1.1.15 root 3410: int FrameCycles, HblCounterVideo, LineCycles;
3411: bool Add16px = false;
1.1.1.13 root 3412: static Uint8 LastVal8265 = 0;
3413: int Delayed;
3414:
1.1.1.15 root 3415: Video_GetPosition_OnWriteAccess ( &FrameCycles , &HblCounterVideo , &LineCycles );
1.1.1.10 root 3416:
1.1.1.13 root 3417: RegAddr = IoAccessCurrentAddress; /* 0xff8264 or 0xff8265 */
3418: ScrollCount = IoMem[ RegAddr ];
1.1.1.11 root 3419: ScrollCount &= 0x0f;
1.1.1.10 root 3420:
1.1.1.13 root 3421: if ( RegAddr == 0xff8264 )
3422: {
3423: Prefetch = 0; /* scroll without prefetch */
1.1.1.15 root 3424: LastCycleScroll8264 = FrameCycles;
1.1.1.11 root 3425:
1.1.1.15 root 3426: ShifterFrame.Scroll8264Pos.VBL = nVBLs;
3427: ShifterFrame.Scroll8264Pos.FrameCycles = FrameCycles;
3428: ShifterFrame.Scroll8264Pos.HBL = HblCounterVideo;
3429: ShifterFrame.Scroll8264Pos.LineCycles = LineCycles;
3430:
3431: if ( ( ScrollCount == 0 ) && ( LastVal8265 > 0 )
3432: && ( ShifterFrame.Scroll8265Pos.VBL > 0 ) /* a write to ff8265 has been made */
3433: && ( ShifterFrame.Scroll8265Pos.VBL == ShifterFrame.Scroll8264Pos.VBL ) /* during the same VBL */
3434: && ( ShifterFrame.Scroll8264Pos.FrameCycles - ShifterFrame.Scroll8265Pos.FrameCycles <= 40 ) )
1.1.1.13 root 3435: {
1.1.1.15 root 3436: LOG_TRACE(TRACE_VIDEO_BORDER_H , "detect ste left+16 pixels\n" );
3437: Add16px = true;
1.1.1.13 root 3438: }
3439: }
3440: else
1.1.1.11 root 3441: {
1.1.1.13 root 3442: Prefetch = 1; /* scroll with prefetch */
1.1.1.15 root 3443: LastCycleScroll8265 = FrameCycles;
3444:
3445: ShifterFrame.Scroll8265Pos.VBL = nVBLs;
3446: ShifterFrame.Scroll8265Pos.FrameCycles = FrameCycles;
3447: ShifterFrame.Scroll8265Pos.HBL = HblCounterVideo;
3448: ShifterFrame.Scroll8265Pos.LineCycles = LineCycles;
3449:
1.1.1.13 root 3450: LastVal8265 = ScrollCount;
1.1.1.15 root 3451: Add16px = false;
1.1.1.11 root 3452: }
1.1.1.13 root 3453:
3454:
3455: /* If the write was made before display starts on the current line, then */
3456: /* we can still change the value now. Else, the new values will be used */
3457: /* for line n+1. */
3458: /* We must also check the write does not overlap the end of the line */
1.1.1.15 root 3459: if ( ( ( LineCycles <= LINE_START_CYCLE_50 ) && ( nHBL == HblCounterVideo ) )
1.1.1.18 root 3460: || ( nHBL < nStartHBL ) || ( nHBL >= nEndHBL + BlankLines ) )
1.1.1.11 root 3461: {
1.1.1.13 root 3462: HWScrollCount = ScrollCount; /* display has not started, we can still change */
3463: HWScrollPrefetch = Prefetch;
3464: bSteBorderFlag = Add16px;
3465: NewHWScrollCount = -1; /* cancel 'pending' change */
1.1.1.15 root 3466: Delayed = false;
1.1.1.11 root 3467: }
3468: else
3469: {
1.1.1.13 root 3470: NewHWScrollCount = ScrollCount; /* display has started, can't change HWScrollCount now */
3471: NewHWScrollPrefetch = Prefetch;
3472: if ( Add16px )
3473: NewSteBorderFlag = 1;
3474: else
3475: NewSteBorderFlag = 0;
1.1.1.15 root 3476: Delayed = true;
1.1.1.11 root 3477: }
3478:
1.1.1.15 root 3479: 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 3480: RegAddr , ScrollCount, Delayed ? "yes" : "no" ,
1.1.1.15 root 3481: FrameCycles, LineCycles, nHBL, HblCounterVideo, M68000_GetPC(), CurrentInstrCycles );
1.1.1.13 root 3482: }
1.1.1.11 root 3483:
3484: /*-----------------------------------------------------------------------*/
3485: /**
3486: * Write to TT shifter mode register (0xff8262)
3487: */
3488: void Video_TTShiftMode_WriteWord(void)
3489: {
3490: TTRes = IoMem_ReadByte(0xff8262) & 7;
1.1.1.21! root 3491: TTSpecialVideoMode = IoMem_ReadByte(0xff8262) & 0x90;
1.1.1.11 root 3492:
3493: /*fprintf(stderr, "Write to FF8262: %x, res=%i\n", IoMem_ReadWord(0xff8262), TTRes);*/
3494:
3495: /* Is it an ST compatible resolution? */
3496: if (TTRes <= 2)
3497: {
3498: IoMem_WriteByte(0xff8260, TTRes);
3499: Video_ShifterMode_WriteByte();
1.1.1.21! root 3500: IoMem_WriteByte(0xff8262, TTRes | TTSpecialVideoMode);
! 3501: }
! 3502:
! 3503: if(TTSpecialVideoMode & 0x80)
! 3504: {
! 3505: bTTSampleHold = true;
! 3506: }
! 3507: else
! 3508: {
! 3509: bTTSampleHold = false;
! 3510: }
! 3511:
! 3512: if(TTSpecialVideoMode & 0x10)
! 3513: {
! 3514: bTTHypermono = true;
! 3515: }
! 3516: else
! 3517: {
! 3518: bTTHypermono = false;
1.1.1.11 root 3519: }
3520: }
3521:
3522: /*-----------------------------------------------------------------------*/
3523: /**
3524: * Write to TT color register (0xff8400)
3525: */
3526: void Video_TTColorRegs_WriteWord(void)
3527: {
1.1.1.15 root 3528: bTTColorsSync = false;
1.1.1.11 root 3529: }
3530:
3531: /*-----------------------------------------------------------------------*/
3532: /**
1.1.1.15 root 3533: * Write to ST color register on TT (0xff8240)
1.1.1.11 root 3534: */
3535: void Video_TTColorSTRegs_WriteWord(void)
3536: {
1.1.1.15 root 3537: bTTColorsSTSync = false;
1.1.1.8 root 3538: }
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