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1.1 root 1: /*
1.1.1.5 root 2: Hatari - video.c
3:
4: This file is distributed under the GNU Public License, version 2 or at
5: your option any later version. Read the file gpl.txt for details.
1.1 root 6:
1.1.1.7 root 7: Video hardware handling. This code handling all to do with the video chip.
8: So, we handle VBLs, HBLs, copying the ST screen to a buffer to simulate the
9: TV raster trace, border removal, palette changes per HBL, the 'video address
10: pointer' etc...
1.1 root 11: */
1.1.1.11 root 12:
13: /* 2007/03/xx [NP] Support for cycle precise border removal / hardware scrolling by using */
14: /* Cycles_GetCounterOnWriteAccess (support left/right border and lines with*/
15: /* length of +26, +2, -2, +44, -106 bytes). */
16: /* Add support for 'Enchanted Lands' second removal of right border. */
17: /* More precise support for reading video counter $ff8205/07/09. */
18: /* 2007/04/14 [NP] Precise reloading of $ff8201/03 into $ff8205/07/09 at line 310 on cycle */
19: /* RESTART_VIDEO_COUNTER_CYCLE (ULM DSOTS Demo). */
20: /* 2007/04/16 [NP] Better Video_CalculateAddress. We must substract a "magic" 12 cycles to */
21: /* Cycles_GetCounterOnReadAccess(CYCLES_COUNTER_VIDEO) to get a correct */
22: /* value (No Cooper's video synchro protection is finaly OK :) ). */
23: /* 2007/04/17 [NP] - Switch to 60 Hz to remove top border on line 33 should occur before */
24: /* LINE_REMOVE_TOP_CYCLE (a few cycles before the HBL) */
25: /* 2007/04/23 [NP] - Slight change in Video_StoreResolution to ignore hi res if the line */
26: /* has left/right border removed -> assume of lo res line. */
27: /* - Handle simultaneous removal of right border and bottom border with */
28: /* the same long switch to 60 Hz (Sync Screen in SNY II). */
29: /* 2007/05/06 [NP] More precise tests for top border's removal. */
1.1.1.15 root 30: /* 2007/05/11 [NP] Add support for med res overscan (No Cooper Greetings). */
1.1.1.11 root 31: /* 2007/05/12 [NP] - LastCycleSync50 and LastCycleSync60 for better top border's removal */
32: /* in Video_EndHBL. */
33: /* - Use VideoOffset in Video_CopyScreenLineColor to handle missing planes */
1.1.1.15 root 34: /* depending on line (med/lo and borders). */
1.1.1.11 root 35: /* 2007/09/25 [NP] Replace printf by calls to HATARI_TRACE. */
36: /* 2007/10/02 [NP] Use the new int.c to add interrupts with INT_CPU_CYCLE / INT_MFP_CYCLE. */
37: /* 2007/10/23 [NP] Add support for 0 byte line (60/50 switch at cycle 56). Allow 5 lines */
38: /* hardscroll (e.g. SHFORSTV.EXE by Paulo Simmoes). */
1.1.1.15 root 39: /* 2007/10/31 [NP] Use BORDERMASK_LEFT_OFF_MED when left border is removed with hi/med */
1.1.1.11 root 40: /* switch (ST CNX in PYM). */
41: /* 2007/11/02 [NP] Add support for 4 pixel hardware scrolling ("Let's Do The Twist" by */
42: /* ST CNX in Punish Your Machine). */
1.1.1.15 root 43: /* 2007/11/05 [NP] Depending on the position of the med res switch, the planes will be */
44: /* shifted when doing med res overscan (Best Part Of the Creation in PYM */
1.1.1.11 root 45: /* or No Cooper Greetings). */
1.1.1.15 root 46: /* 2007/11/30 [NP] A hi/med switch to remove the left border can be either used to initiate*/
47: /* a right hardware scrolling in low res (St Cnx) or a complete med res */
1.1.1.11 root 48: /* overscan line (Dragonnels Reset Part). */
49: /* Use bit 0-15, 16-19 and 20-23 in ScreenBorderMask[] to track border */
50: /* trick, STF hardware scrolling and plane shifting. */
51: /* 2007/12/22 [NP] Very precise values for VBL_VIDEO_CYCLE_OFFSET, HBL_VIDEO_CYCLE_OFFSET */
52: /* TIMERB_VIDEO_CYCLE_OFFSET and RESTART_VIDEO_COUNTER_CYCLE. These values */
53: /* were calculated using sttiming.s on a real STF and should give some very*/
54: /* accurate results (also uses 56 cycles instead of 44 to process an */
1.1.1.13 root 55: /* HBL/VBL/MFP exception). */
1.1.1.11 root 56: /* 2007/12/29 [NP] Better support for starting line 2 bytes earlier (if the line starts in */
57: /* 60 Hz and goes back to 50 Hz later), when combined with top border */
58: /* removal (Mindbomb Demo - D.I. No Shit). */
59: /* 2007/12/30 [NP] Slight improvement of VideoAdress in Video_CalculateAddress when reading*/
60: /* during the top border. */
61: /* Correct the case where removing top border on line 33 could also be */
62: /* interpreted as a right border removal (which is not possible since the */
63: /* display is still off at that point). */
64: /* 2008/01/03 [NP] Better handling of nStartHBL and nEndHBL when switching freq from */
65: /* 50 to 60 Hz. Allows emulation of a "short" 50 Hz screen of 171 lines */
66: /* and a more precise removal of bottom border in 50 and 60 Hz. */
67: /* 2008/01/04 [NP] More generic detection for removing 2 bytes to the right of the line */
68: /* when switching from 60 to 50 Hz (works even with a big number of cycles */
69: /* between the freq changes) (Phaleon's Menus). */
70: /* 2008/01/06 [NP] More generic detection for stopping the display in the middle of a line */
71: /* with a hi / lo res switch (-106 bytes per line). Although switch to */
72: /* hi res should occur at cycle 160, some demos use 164 (Phaleon's Menus). */
73: /* 2008/01/06 [NP] Better bottom border's removal in 50 Hz : switch to 60 Hz must occur */
74: /* before cycle LINE_REMOVE_BOTTOM_CYCLE on line 263 and switch back to 50 */
75: /* Hz must occur after LINE_REMOVE_BOTTOM_CYCLE on line 263 (this means */
76: /* we can already be in 50 Hz when Video_EndHBL is called and still remove */
77: /* the bottom border). This is similar to the tests used to remove the */
78: /* top border. */
79: /* 2008/01/12 [NP] In Video_SetHBLPaletteMaskPointers, consider that if a color's change */
80: /* occurs after cycle LINE_END_CYCLE_NO_RIGHT, then it's related to the */
81: /* next line. */
82: /* FIXME : it would be better to handle all color changes through spec512.c*/
83: /* and drop the 16 colors palette per line. */
84: /* FIXME : we should use Cycles_GetCounterOnWriteAccess, but it doesn't */
85: /* support multiple accesses like move.l or movem. */
86: /* 2008/01/12 [NP] Handle 60 Hz switch during the active display of the last line to remove*/
87: /* the bottom border : this should also shorten line by 2 bytes (F.N.I.L. */
88: /* Demo by TNT). */
89: /* 2008/01/15 [NP] Don't do 'left+2' if switch back to 50 Hz occurs when line is not active*/
90: /* (after cycle LINE_END_CYCLE_60) (XXX International Demos). */
91: /* 2008/01/31 [NP] Improve left border detection : allow switch to low res on cycle <= 28 */
92: /* instead of <= 20 (Vodka Demo Main Menu). */
93: /* 2008/02/02 [NP] Added 0 byte line detection when switching hi/lo res at position 28 */
94: /* (Lemmings screen in Nostalgic-o-demo). */
95: /* 2008/02/03 [NP] On STE, write to video counter $ff8205/07/09 should only be applied */
96: /* immediatly if display has not started for the line (before cycle */
97: /* LINE_END_CYCLE_50). If write occurs after, the change to pVideoRaster */
98: /* should be delayed to the end of the line, after processing the current */
99: /* line with Video_CopyScreenLineColor (Stardust Tunnel Demo). */
100: /* 2008/02/04 [NP] The problem is similar when writing to hwscroll $ff8264, we must delay */
101: /* the change until the end of the line if display was already started */
102: /* (Mindrewind by Reservoir Gods). */
103: /* 2008/02/06 [NP] On STE, when left/right borders are off and hwscroll > 0, we must read */
104: /* 6 bytes less than the expected value (E605 by Light). */
105: /* 2008/02/17 [NP] In Video_CopyScreenLine, LineWidth*2 bytes should be added after */
106: /* pNewVideoRaster is copied to pVideoRaster (Braindamage Demo). */
107: /* When reading a byte at ff8205/07/09, all video address bytes should be */
108: /* updated in Video_ScreenCounter_ReadByte, not just the byte that was */
109: /* read. Fix programs that just modify one byte in the video address */
110: /* counter (e.g. sub #1,$ff8207 in Braindamage Demo). */
111: /* 2008/02/19 [NP] In Video_CalculateAddress, use pVideoRaster instead of VideoBase to */
112: /* determine the video address when display is off in the upper part of */
113: /* the screen (in case ff8205/07/09 were modified on STE). */
114: /* 2008/02/20 [NP] Better handling in Video_ScreenCounter_WriteByte by changing only one */
115: /* byte and keeping the other (Braindamage End Part). */
116: /* 2008/03/08 [NP] Use M68000_INT_VIDEO when calling M68000_Exception(). */
117: /* 2008/03/13 [NP] On STE, LineWidth value in $ff820f is added to the shifter counter just */
118: /* when display is turned off on a line (when right border is started, */
119: /* which is usually on cycle 376). */
120: /* This means a write to $ff820f should be applied immediatly only if it */
121: /* occurs before cycle LineEndCycle. Else, it is stored in NewLineWidth */
122: /* and used after Video_CopyScreenLine has processed the current line */
123: /* (improve the bump mapping part in Pacemaker by Paradox). */
124: /* LineWidth should be added to pVideoRaster before checking the possible */
125: /* modification of $ff8205/07/09 in Video_CopyScreenLine. */
126: /* 2008/03/14 [NP] Rename ScanLineSkip to LineWidth (more consistent with STE docs). */
127: /* On STE, better support for writing to video counter, line width and */
128: /* hw scroll. If write to register occurs just at the start of a new line */
129: /* but before Video_EndHBL (because the move started just before cycle 512)*/
130: /* then the new value should not be set immediatly but stored and set */
131: /* during Video_EndHBL (fix the bump mapping part in Pacemaker by Paradox).*/
1.1.1.12 root 132: /* 2008/03/25 [NP] On STE, when bSteBorderFlag is true, we should add 16 pixels to the left*/
133: /* border, not to the right one (Just Musix 2 Menu by DHS). */
134: /* 2008/03/26 [NP] Clear the rest of the border when using border tricks left+2, left+8 */
135: /* or right-106 (remove garbage pixels when hatari resolution changes). */
136: /* 2008/03/29 [NP] Function Video_SetSystemTimings to use different values depending on */
137: /* the machine type. On STE, top/bottom border removal can occur at cycle */
138: /* 500 instead of 504 on STF. */
1.1.1.13 root 139: /* 2008/04/02 [NP] Correct a rare case in Video_Sync_WriteByte at the end of line 33 : */
140: /* nStartHBL was set to 33 instead of 64, which gave a wrong address in */
141: /* Video_CalculateAddress. */
142: /* 2008/04/04 [NP] The value of RestartVideoCounterCycle is slightly different between */
143: /* an STF and an STE. */
144: /* 2008/04/05 [NP] The value of VblVideoCycleOffset is different of 4 cycles between */
145: /* STF and STE (fix end part in Pacemaker by Paradox). */
146: /* 2008/04/09 [NP] Preliminary support for lines using different frequencies in the same */
147: /* screen. In Video_InterruptHandler_EndLine, if the current freq is 50 Hz,*/
148: /* then next int should be scheduled in 512 cycles ; if freq is 60 Hz, */
149: /* next int should be in 508 cycles (used by timer B event count mode). */
150: /* 2008/04/10 [NP] Update LineEndCycle after changing freq to 50 or 60 Hz. */
151: /* Set EndLine interrupt to happen 28 cycles after LineEndCycle. This way */
152: /* Timer B occurs at cycle 404 in 50 Hz, or cycle 400 in 60 Hz (improve */
153: /* flickering bottom border in B.I.G. Demo screen 1). */
154: /* 2008/04/12 [NP] In the case of a 'right-2' line, we should not change the EndLine's int */
155: /* position when switching back to 50 Hz ; the int should happen at */
156: /* position LINE_END_CYCLE_60 + 28 (Anomaly Demo main menu). */
157: /* 2008/05/31 [NP] Ignore consecutives writes of the same value in the freq/res register. */
158: /* Only the 1st write matters, else this could confuse the code to remove */
159: /* top/bottom border (fix OSZI.PRG demo by ULM). */
160: /* 2008/06/07 [NP] In Video_SetHBLPaletteMaskPointers, use LineStartCycle instead of the */
161: /* 50 Hz constant SCREEN_START_CYCLE. */
162: /* Rename SCREEN_START_HBL_xxx to VIDEO_START_HBL_xxx. */
163: /* Rename SCREEN_END_HBL_xxx to VIDEO_END_HBL_xxx. */
164: /* Rename SCREEN_HEIGHT_HBL_xxx to VIDEO_HEIGHT_HBL_xxx. */
165: /* Use VIDEO_HEIGHT_BOTTOM_50HZ instead of OVERSCAN_BOTTOM. */
166: /* 2008/06/16 [NP] When Hatari is configured to display the screen's borders, 274 lines */
167: /* will be rendered on screen, but if the shifter is in 60 Hz, the last */
168: /* 16 lines will never be used, which can leave some bad pixels on */
169: /* screen. We clear the remaining lines before calling 'Screen_Draw'. */
170: /* (in FNIL by Delta Force, fix flickering gfx in the bottom border of the */
171: /* F2 screen : last 16 lines were the ones from the menu where bottom */
172: /* border was removed ). */
173: /* 2008/06/26 [NP] Improve STE scrolling : handle $ff8264 (no prefetch) and $ff8265 */
174: /* (prefetch). See Video_HorScroll_Write for details on both registers. */
175: /* More generic support for starting display 16 pixels earlier on STE */
176: /* by writing to $ff8265 and settting $ff8264=0 just after. */
177: /* (fix Digiworld 2 by ICE, which uses $ff8264 for horizontal scroll). */
178: /* 2008/07/07 [NP] Ignore other 50/60 Hz switches once the right border was removed, keep */
179: /* the timer B to occur at pos 460+28 (fix Oxygene screen in Transbeauce 2)*/
180: /* 2008/07/14 [NP] When removing only left border in 60Hz, line size is 26+158 bytes */
181: /* instead of 26+160 bytes in 50 Hz (HigResMode demo by Paradox). */
182: /* 2008/07/19 [NP] If $ff8260==3 (which is not a valid resolution mode), we use 0 instead */
183: /* (low res) (fix Omegakul screen in old Omega Demo from 1988). */
184: /* 2008/09/05 [NP] No need to test 60/50 switch if HblCounterVideo < nStartHBL (display */
185: /* has not started yet). */
186: /* 2008/09/25 [NP] Use nLastVisibleHbl to store the number of the last hbl line that should*/
187: /* be copied to the emulator's screen buffer. */
188: /* On STE, allow to change immediatly video address, hw scroll and */
189: /* linewidth when nHBL>=nLastVisibleHbl instead of nHBL>=nEndHBL */
190: /* (fix Power Rise / Xtrem D demo). */
191: /* 2008/11/15 [NP] For STE registers, add in the TRACE call if the write is delayed or */
192: /* not (linewidth, hwscroll, video address). */
193: /* On STE, allow to change linewdith, hwscroll and video address with no */
194: /* delay as soon as nHBL >= nEndHBL (revert previous changes). Power Rise */
195: /* is still working due to NewHWScrollCount=-1 when setting immediate */
196: /* hwscroll. Fix regression in Braindamage. */
1.1.1.14 root 197: /* 2008/11/29 [NP] Increment jitter's index for HBL and VBL each time a possible interrupt */
198: /* occurs. Each interrupt can have a jitter between 0, 4 and 8 cycles ; the*/
199: /* jitter follows a predefined pattern of 5 values. The HBL and the VBL */
200: /* have their own pattern. See InterruptAddJitter() in uae-cpu/newcpu.c */
201: /* (fix Fullscreen tunnel in Suretrip 49% by Checkpoint and digi sound in */
202: /* Swedish New Year's TCB screen). */
203: /* 2008/12/10 [NP] Enhance support for 0 byte line. The 60/50 Hz switch can happen at */
204: /* cycles 56/64, but also at 58/66 (because access to $ff820a doesn't */
205: /* require to be on a 4 cycles boundary). As hatari doesn't handle */
206: /* multiple of 2 cycles, we allow cycles 56/64 and 60/68 (fix nosync.tos */
207: /* that uses the STOP instruction to produce a 0 byte line on the first */
208: /* displayed line (found on atari-forum.com)). */
1.1.1.17! root 209: /* 2008/12/26 [NP] When reading $ff8260 on STF, set unused bits to 1 instead of 0 */
1.1.1.14 root 210: /* (fix wrong TOS resolution in Awesome Menu Disk 16). */
211: /* Set unused bit to 1 when reading $ff820a too. */
212: /* 2009/01/16 [NP] Handle special case when writing only in upper byte of a color reg. */
213: /* 2009/01/21 [NP] Implement STE horizontal scroll for medium res (fixes cool_ste.prg). */
214: /* Take the current res into account in Video_CopyScreenLineColor to */
1.1.1.15 root 215: /* allow mixing low/med res with horizontal scroll on STE. */
216: /* 2009/01/24 [NP] Better detection of 'right-2' when freq is changed to 60 Hz and */
217: /* restored to 50 after the end of the current line (fixes games menu on */
218: /* BBC compil 10). */
219: /* 2009/01/31 [NP] Handle a rare case where 'move.b #8,$fffa1f' to start the timer B is */
220: /* done just a few cycles before the actual signal for end of line. In that*/
221: /* case we must ensure that the write was really effective before the end */
222: /* of line (else no interrupt should be made) (fix Pompey Pirate Menu #57).*/
223: /* 2009/02/08 [NP] Handle special case for simultaneous HBL exceptions (fixes flickering in*/
224: /* Monster Business and Super Monaco GP). */
225: /* 2009/02/25 [NP] Ignore other 50/60 Hz switches after display was stopped in the middle */
226: /* of the line with a hi/lo switch. Correct missing end of line timer B */
227: /* interrupt in that case (fix flickering Dragon Ball part in Blood disk 2 */
228: /* by Holocaust). */
229: /* 2008/02/02 [NP] Added 0 byte line detection in STE mode when switching hi/lo res */
230: /* at position 32 (Lemmings screen in Nostalgic-o-demo). */
231: /* 2009/03/28 [NP] Depending on bit 3 of MFP's AER, timer B will count end of line events */
232: /* (bit=0) or start of line events (bit=1) (fix Seven Gates Of Jambala). */
233: /* 2009/04/02 [NP] Add another method to obtain a 0 byte line, by switching to hi/lo res */
234: /* at position 500/508 (fix the game No Buddies Land). */
235: /* 2009/04/xx [NP] Rewrite of many parts : add SHIFTER_FRAME structure, better accuracy */
236: /* when mixing 50/60 Hz lines and reading $ff8209, better emulation of */
237: /* HBL and Timer B position when changing freq/res, better emulation of */
238: /* freq changes for top/bottom/right borders. */
239: /* 2009/07/16 [NP] In Video_SetHBLPaletteMaskPointers, if LineCycle>460 we consider the */
240: /* color's change should be applied to next line (used when spec512 mode */
241: /* if off). */
1.1.1.16 root 242: /* 2009/10/31 [NP] Depending on the overscan mode, the displayed lines must be shifted */
243: /* left or right (fix Spec 512 images in the Overscan Demos, fix pixels */
244: /* alignment in screens mixing normal lines and overscan lines). */
245: /* 2009/12/02 [NP] If we switch hi/lo around position 464 (as in Enchanted Lands) and */
246: /* right border was not removed, then we get an empty line on the next */
247: /* HBL (fix Pax Plax Parralax in Beyond by Kruz). */
248: /* 2009/12/06 [NP] Add support for STE 224 bytes overscan without stabiliser by switching */
249: /* hi/lo at cycle 504/4 to remove left border (fix More Or Less Zero and */
250: /* Cernit Trandafir by DHS, as well as Save The Earth by Defence Force). */
251: /* 2009/12/13 [NP] Improve STE 224 bytes lines : correctly set leftmost 16 pixels to color */
252: /* 0 and correct small glitches when combined with hscroll ($ff8264). */
253: /* 2009/12/13 [NP] Line scrolling caused by hi/lo switch (STF_PixelScroll) should be */
254: /* applied after STE's hardware scrolling, else in overscan 4 color 0 */
255: /* pixels will appear in the right border (because overscan shift the */
256: /* whole displayed area 4 pixels to the left) (fix possible regression on */
257: /* STE introduced on 2009/10/31). */
258: /* 2010/01/10 [NP] In Video_CalculateAddress, take bSteBorderFlag into account (+16 pixels */
259: /* in left border on STE). */
260: /* 2010/01/10 [NP] In Video_CalculateAddress, take HWScrollPrefetch into account (shifter */
261: /* starts 16 pixels earlier) (fix EPSS demo by Unit 17). */
262: /* 2010/02/05 [NP] In Video_CalculateAddress, take STE's LineWidth into account when */
263: /* display is disabled in the right border (fix flickering in Utopos). */
264: /* 2010/02/07 [NP] Better support for modifying $ff8205/07/09 while display is on */
265: /* (fix EPSS demo by Unit 17). */
266: /* 2010/04/12 [NP] Improve timings when writing to $ff8205/07/09 when hscroll is used, */
267: /* using Video_GetMMUStartCycle (fix Pacemaker's Bump Part by Paradox). */
268: /* 2010/05/02 [NP] In Video_ConvertPosition, handle the case where we read the position */
269: /* between the last HBL and the start of the next VBL. During 64 cycles */
270: /* FrameCycles can be >= CYCLES_PER_FRAME (harmless fix, only useful when */
271: /* using --trace to get correct positions in the logs). */
272: /* 2010/05/04 [NP] Improve Video_ConvertPosition, use CyclesPerVBL instead of evaluating */
273: /* CYCLES_PER_FRAME (whose value could have changed this the start of the */
274: /* VBL). */
275: /* 2010/05/15 [NP] In Video_StartInterrupts() when running in monochrome (224 cycles per */
276: /* line), the VBL could sometimes be delayed by 160 cycles (divs) and */
277: /* hbl/timer B interrupts for line 0 were not called, which could cause an */
278: /* assert/crash in Hatari when setting timer B on line 2. */
279: /* If we detect VBL was delayed too much, we add hbl/timer b in the next */
280: /* 4 cycles. */
1.1.1.17! root 281: /* 2010/07/05 [NP] When removing left border, allow up to 32 cycles between hi and low */
! 282: /* res switching (fix Megabeer by Invizibles). */
! 283: /* 2010/11/01 [NP] On STE, the 224 bytes overscan will shift the screen 8 pixels to the */
! 284: /* left. */
! 285: /* For 230 bytes overscan, handle scrolling prefetching when computing */
! 286: /* pVideoRaster for the next line. */
! 287: /* 2010/12/12 [NP] In Video_CopyScreenLineColor, use pVideoRasterEndLine to improve */
! 288: /* STE's horizontal scrolling for any line's length (160, 224, 230, ...). */
! 289: /* Fix the last 16 pixels for 224 bytes overscan (More Or Less Zero and */
! 290: /* Cernit Trandafir by DHS, Save The Earth by Defence Force). */
! 291: /* 2011/04/03 [NP] Call DmaSnd_HBL_Update() on each HBL to handle programs that modify */
! 292: /* the samples data while those data are played by the DMA sound. */
! 293: /* (fixes the game Power Up Plus and the demo Mental Hangover). */
1.1.1.11 root 294:
295:
1.1.1.12 root 296:
1.1.1.15 root 297: const char Video_fileid[] = "Hatari video.c : " __DATE__ " " __TIME__;
1.1 root 298:
1.1.1.7 root 299: #include <SDL_endian.h>
1.1.1.4 root 300:
1.1 root 301: #include "main.h"
1.1.1.6 root 302: #include "configuration.h"
1.1.1.10 root 303: #include "cycles.h"
1.1 root 304: #include "fdc.h"
1.1.1.16 root 305: #include "cycInt.h"
1.1.1.8 root 306: #include "ioMem.h"
1.1.1.4 root 307: #include "keymap.h"
1.1 root 308: #include "m68000.h"
309: #include "memorySnapShot.h"
310: #include "mfp.h"
1.1.1.11 root 311: #include "printer.h"
1.1 root 312: #include "screen.h"
1.1.1.13 root 313: #include "screenSnapShot.h"
1.1 root 314: #include "shortcut.h"
315: #include "sound.h"
1.1.1.17! root 316: #include "dmaSnd.h"
1.1 root 317: #include "spec512.h"
318: #include "stMemory.h"
319: #include "vdi.h"
320: #include "video.h"
321: #include "ymFormat.h"
1.1.1.11 root 322: #include "falcon/videl.h"
323: #include "falcon/hostscreen.h"
1.1.1.16 root 324: #include "avi_record.h"
1.1.1.4 root 325:
326:
1.1.1.11 root 327: /* The border's mask allows to keep track of all the border tricks */
328: /* applied to one video line. The masks for all lines are stored in the array */
329: /* ScreenBorderMask[]. */
330: /* - bits 0-15 are used to describe the border tricks. */
331: /* - bits 20-23 are used to store the bytes offset to apply for some particular */
1.1.1.15 root 332: /* tricks (for example med res overscan can shift display by 0 or 2 bytes */
333: /* depending on when the switch to med res is done after removing the left */
1.1.1.11 root 334: /* border). */
335:
1.1.1.14 root 336: #define BORDERMASK_NONE 0x00 /* no effect on this line */
1.1.1.11 root 337: #define BORDERMASK_LEFT_OFF 0x01 /* removal of left border with hi/lo res switch -> +26 bytes */
338: #define BORDERMASK_LEFT_PLUS_2 0x02 /* line starts earlier in 60 Hz -> +2 bytes */
339: #define BORDERMASK_STOP_MIDDLE 0x04 /* line ends in hires at cycle 160 -> -106 bytes */
340: #define BORDERMASK_RIGHT_MINUS_2 0x08 /* line ends earlier in 60 Hz -> -2 bytes */
341: #define BORDERMASK_RIGHT_OFF 0x10 /* removal of right border -> +44 bytes */
342: #define BORDERMASK_RIGHT_OFF_FULL 0x20 /* full removal of right border and next left border -> +22 bytes */
1.1.1.15 root 343: #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 344: #define BORDERMASK_EMPTY_LINE 0x80 /* 60/50 Hz switch prevents the line to start, video counter is not incremented */
1.1.1.15 root 345: #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 346: #define BORDERMASK_LEFT_OFF_2_STE 0x200 /* shorter removal of left border with hi/lo res switch -> +20 bytes (STE only)*/
1.1.1.11 root 347:
348:
349: int STRes = ST_LOW_RES; /* current ST resolution */
350: int TTRes; /* TT shifter resolution mode */
1.1.1.13 root 351: int nFrameSkips; /* speed up by skipping video frames */
1.1.1.9 root 352:
1.1.1.13 root 353: bool bUseHighRes; /* Use hi-res (ie Mono monitor) */
1.1 root 354: int OverscanMode; /* OVERSCANMODE_xxxx for current display frame */
1.1.1.17! root 355: Uint16 HBLPalettes[HBL_PALETTE_LINES]; /* 1x16 colour palette per screen line, +1 line just incase write after line 200 */
1.1.1.8 root 356: Uint16 *pHBLPalettes; /* Pointer to current palette lists, one per HBL */
1.1.1.17! root 357: Uint32 HBLPaletteMasks[HBL_PALETTE_MASKS]; /* Bit mask of palette colours changes, top bit set is resolution change */
1.1.1.9 root 358: Uint32 *pHBLPaletteMasks;
1.1.1.15 root 359: int nScreenRefreshRate = 50; /* 50 or 60 Hz in color, 71 Hz in mono */
1.1.1.8 root 360: Uint32 VideoBase; /* Base address in ST Ram for screen (read on each VBL) */
1.1.1.9 root 361:
1.1.1.11 root 362: int nVBLs; /* VBL Counter */
363: int nHBL; /* HBL line */
364: int nStartHBL; /* Start HBL for visible screen */
365: int nEndHBL; /* End HBL for visible screen */
1.1.1.10 root 366: int nScanlinesPerFrame = 313; /* Number of scan lines per frame */
367: int nCyclesPerLine = 512; /* Cycles per horizontal line scan */
1.1.1.13 root 368: static int nFirstVisibleHbl = FIRST_VISIBLE_HBL_50HZ; /* The first line of the ST screen that is copied to the PC screen buffer */
369: 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 370: static int CyclesPerVBL = 313*512; /* Number of cycles per VBL */
1.1.1.10 root 371:
1.1.1.13 root 372: static Uint8 HWScrollCount; /* HW scroll pixel offset, STE only (0...15) */
373: static int NewHWScrollCount = -1; /* Used in STE mode when writing to the scrolling registers $ff8264/65 */
374: static Uint8 HWScrollPrefetch; /* 0 when scrolling with $ff8264, 1 when scrolling with $ff8265 */
375: static int NewHWScrollPrefetch = -1; /* Used in STE mode when writing to the scrolling registers $ff8264/65 */
376: static Uint8 LineWidth; /* Scan line width add, STe only (words, minus 1) */
377: static int NewLineWidth = -1; /* Used in STE mode when writing to the line width register $ff820f */
1.1.1.16 root 378: static int VideoCounterDelayedOffset = 0; /* Used in STE mode when changing video counter while display is on */
379: 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 380: static Uint8 *pVideoRaster; /* Pointer to Video raster, after VideoBase in PC address space. Use to copy data on HBL */
381: static Uint8 VideoShifterByte; /* VideoShifter (0xff8260) value store in video chip */
1.1.1.15 root 382: static bool bSteBorderFlag; /* true when screen width has been switched to 336 (e.g. in Obsession) */
1.1.1.13 root 383: static int NewSteBorderFlag = -1; /* New value for next line */
384: static bool bTTColorsSync, bTTColorsSTSync; /* whether TT colors need convertion to SDL */
1.1 root 385:
1.1.1.17! root 386: static int LastCycleScroll8264; /* value of Cycles_GetCounterOnWriteAccess last time ff8264 was set for the current VBL */
! 387: static int LastCycleScroll8265; /* value of Cycles_GetCounterOnWriteAccess last time ff8265 was set for the current VBL */
! 388:
! 389: static int LineRemoveTopCycle = LINE_REMOVE_TOP_CYCLE_STF;
! 390: static int LineRemoveBottomCycle = LINE_REMOVE_BOTTOM_CYCLE_STF;
! 391: static int RestartVideoCounterCycle = RESTART_VIDEO_COUNTER_CYCLE_STF;
! 392: static int VblVideoCycleOffset = VBL_VIDEO_CYCLE_OFFSET_STF;
1.1.1.13 root 393:
1.1.1.15 root 394: int LastCycleHblException; /* value of Cycles_GetCounter last time a level 2 interrupt was executed by the CPU */
395:
1.1.1.13 root 396: int LineTimerBCycle = LINE_END_CYCLE_50 + TIMERB_VIDEO_CYCLE_OFFSET; /* position of the Timer B interrupt on active lines */
1.1.1.15 root 397: int TimerBEventCountCycleStart = -1; /* value of Cycles_GetCounterOnWriteAccess last time timer B was started for the current VBL */
1.1 root 398:
1.1.1.14 root 399: #define HBL_JITTER_MAX_POS 5
400: int HblJitterIndex = 0;
401: int HblJitterArray[] = { 8,4,4,0,0 }; /* measured on STF */
402: int HblJitterArrayPending[] = { 4,4,4,4,4 }; // { 8,8,12,8,12 }; /* measured on STF, not always accurate */
403: #define VBL_JITTER_MAX_POS 5
404: int VblJitterIndex = 0;
405: int VblJitterArray[] = { 8,0,4,0,4 }; /* measured on STF */
406: int VblJitterArrayPending[] = { 8,8,12,8,12 }; /* not verified on STF, use the same as HBL */
407:
1.1.1.12 root 408:
1.1.1.15 root 409:
410: typedef struct
411: {
412: int VBL; /* VBL for this Pos (or -1 if Pos not defined for now) */
413: int FrameCycles; /* Number of cycles since this VBL */
414: int HBL; /* HBL in the VBL */
415: int LineCycles; /* cycles in the HBL */
416: } SHIFTER_POS;
417:
418:
419: typedef struct
420: {
421: int StartCycle; /* first cycle of this line, as returned by Cycles_GetCounter */
422:
423: Uint32 BorderMask; /* borders' states for this line */
424: int DisplayPixelShift; /* number of pixels to shift the whole line (<0 shift to the left, >0 shift to the right) */
425: /* On STF, this is obtained when switching hi/med for a variable number of cycles, */
426: /* but just removing left border will shift the line too. */
427:
428: int DisplayStartCycle; /* cycle where display starts for this line (0-512) : 0, 52 or 56 */
429: int DisplayEndCycle; /* cycle where display ends for this line (0-512) : 0, 160, 372, 376, 460 or 512 */
430: int DisplayBytes; /* how many bytes to display for this line */
431:
432: } SHIFTER_LINE;
433:
434:
435: typedef struct
436: {
437: int HBL_CyclePos; /* cycle position for the HBL int (depends on freq/res) */
438: int TimerB_CyclePos; /* cycle position for the Timer B int (depends on freq/res) */
439:
440: int Freq; /* value of ff820a & 2, or -1 if not set */
441: int Res; /* value of ff8260 & 3, or -1 if not set */
442: SHIFTER_POS FreqPos50; /* position of latest freq change to 50 Hz*/
443: SHIFTER_POS FreqPos60; /* position of latest freq change to 60 Hz*/
444: SHIFTER_POS ResPosLo; /* position of latest change to low res */
445: SHIFTER_POS ResPosMed; /* position of latest change to med res */
446: SHIFTER_POS ResPosHi; /* position of latest change to high res */
447:
448: SHIFTER_POS Scroll8264Pos; /* position of latest write to $ff8264 */
449: SHIFTER_POS Scroll8265Pos; /* position of latest write to $ff8265 */
450:
451: SHIFTER_LINE ShifterLines[ MAX_SCANLINES_PER_FRAME ];
452: } SHIFTER_FRAME;
453:
454:
455: SHIFTER_FRAME ShifterFrame;
456:
457:
458:
459: /*--------------------------------------------------------------*/
460: /* Local functions prototypes */
461: /*--------------------------------------------------------------*/
462:
463: static void Video_SetSystemTimings ( void );
464:
465: static Uint32 Video_CalculateAddress ( void );
1.1.1.16 root 466: static int Video_GetMMUStartCycle ( int DisplayStartCycle );
1.1.1.15 root 467: static void Video_WriteToShifter ( Uint8 Res );
468: static void Video_Sync_SetDefaultStartEnd ( Uint8 Freq , int HblCounterVideo , int LineCycles );
469:
470: static int Video_HBL_GetPos ( void );
471: static void Video_EndHBL ( void );
472: static void Video_StartHBL ( void );
473:
474: static void Video_StoreFirstLinePalette(void);
475: static void Video_StoreResolution(int y);
476: static void Video_CopyScreenLineMono(void);
477: static void Video_CopyScreenLineColor(void);
478: static void Video_CopyVDIScreen(void);
479: static void Video_SetHBLPaletteMaskPointers(void);
480:
481: static void Video_UpdateTTPalette(int bpp);
482: static void Video_DrawScreen(void);
483:
484: static void Video_ResetShifterTimings(void);
485: static void Video_InitShifterLines(void);
486: static void Video_ClearOnVBL(void);
487:
488: static void Video_AddInterrupt ( int Pos , interrupt_id Handler );
489: static void Video_AddInterruptHBL ( int Pos );
490:
491: static void Video_ColorReg_WriteWord(Uint32 addr);
492:
493:
1.1 root 494: /*-----------------------------------------------------------------------*/
1.1.1.11 root 495: /**
496: * Save/Restore snapshot of local variables('MemorySnapShot_Store' handles type)
497: */
1.1.1.13 root 498: void Video_MemorySnapShot_Capture(bool bSave)
1.1 root 499: {
1.1.1.11 root 500: /* Save/Restore details */
501: MemorySnapShot_Store(&VideoShifterByte, sizeof(VideoShifterByte));
502: MemorySnapShot_Store(&TTRes, sizeof(TTRes));
503: MemorySnapShot_Store(&bUseHighRes, sizeof(bUseHighRes));
504: MemorySnapShot_Store(&nVBLs, sizeof(nVBLs));
505: MemorySnapShot_Store(&nHBL, sizeof(nHBL));
506: MemorySnapShot_Store(&nStartHBL, sizeof(nStartHBL));
507: MemorySnapShot_Store(&nEndHBL, sizeof(nEndHBL));
508: MemorySnapShot_Store(&OverscanMode, sizeof(OverscanMode));
509: MemorySnapShot_Store(HBLPalettes, sizeof(HBLPalettes));
510: MemorySnapShot_Store(HBLPaletteMasks, sizeof(HBLPaletteMasks));
511: MemorySnapShot_Store(&VideoBase, sizeof(VideoBase));
512: MemorySnapShot_Store(&LineWidth, sizeof(LineWidth));
513: MemorySnapShot_Store(&HWScrollCount, sizeof(HWScrollCount));
514: MemorySnapShot_Store(&pVideoRaster, sizeof(pVideoRaster));
515: MemorySnapShot_Store(&nScanlinesPerFrame, sizeof(nScanlinesPerFrame));
516: MemorySnapShot_Store(&nCyclesPerLine, sizeof(nCyclesPerLine));
517: MemorySnapShot_Store(&nFirstVisibleHbl, sizeof(nFirstVisibleHbl));
518: MemorySnapShot_Store(&bSteBorderFlag, sizeof(bSteBorderFlag));
1.1.1.14 root 519: MemorySnapShot_Store(&HblJitterIndex, sizeof(HblJitterIndex));
520: MemorySnapShot_Store(&VblJitterIndex, sizeof(VblJitterIndex));
1.1.1.15 root 521: MemorySnapShot_Store(&ShifterFrame, sizeof(ShifterFrame));
522: }
523:
524:
525: /*-----------------------------------------------------------------------*/
526: /**
527: * Reset video chip
528: */
529: void Video_Reset(void)
530: {
531: /* NOTE! Must reset all of these register type things here!!!! */
532:
533: /* Are we in high-res? */
534: if (bUseHighRes)
535: VideoShifterByte = ST_HIGH_RES; /* Boot up for mono monitor */
536: else
537: VideoShifterByte = ST_LOW_RES;
538: if (bUseVDIRes)
539: VideoShifterByte = VDIRes;
540:
541: /* Set system specific timings */
542: Video_SetSystemTimings();
543:
544: /* Reset VBL counter */
545: nVBLs = 0;
546: /* Reset addresses */
547: VideoBase = 0L;
548:
549: /* Reset shifter's state variables */
550: ShifterFrame.Freq = -1;
551: ShifterFrame.Res = -1;
552: ShifterFrame.FreqPos50.VBL = -1;
553: ShifterFrame.FreqPos60.VBL = -1;
554: ShifterFrame.ResPosLo.VBL = -1;
555: ShifterFrame.ResPosMed.VBL = -1;
556: ShifterFrame.ResPosHi.VBL = -1;
557: ShifterFrame.Scroll8264Pos.VBL = -1;
558: ShifterFrame.Scroll8265Pos.VBL = -1;
559:
560: Video_InitShifterLines ();
561:
562: /* Reset STE screen variables */
563: LineWidth = 0;
564: HWScrollCount = 0;
565: bSteBorderFlag = false;
566:
567: NewLineWidth = -1; /* cancel pending modifications set before the reset */
568: NewHWScrollCount = -1;
569:
1.1.1.16 root 570: VideoCounterDelayedOffset = 0;
571: pVideoRasterDelayed = NULL;
572:
1.1.1.15 root 573: /* Reset jitter indexes */
574: HblJitterIndex = 0;
575: VblJitterIndex = 0;
576:
577: /* Clear framecycles counter */
578: Cycles_SetCounter(CYCLES_COUNTER_VIDEO, 0);
579:
580: /* Clear ready for new VBL */
581: Video_ClearOnVBL();
582: }
583:
584:
585: /*-----------------------------------------------------------------------*/
586: /**
587: * Reset the GLUE chip responsible for generating the H/V sync signals.
588: * When the 68000 RESET instruction is called, frequency and resolution
589: * should be reset to 0.
590: */
591: void Video_Reset_Glue(void)
592: {
593: IoMem_WriteByte(0xff820a,0); /* video freq */
594: IoMem_WriteByte(0xff8260,0); /* video res */
1.1 root 595: }
596:
1.1.1.8 root 597:
1.1 root 598: /*-----------------------------------------------------------------------*/
1.1.1.12 root 599: /*
600: * Set specific video timings, depending on the system being emulated.
601: */
1.1.1.15 root 602: static void Video_SetSystemTimings(void)
1.1.1.12 root 603: {
604: if ( ConfigureParams.System.nMachineType == MACHINE_ST )
605: {
606: LineRemoveTopCycle = LINE_REMOVE_TOP_CYCLE_STF;
607: LineRemoveBottomCycle = LINE_REMOVE_BOTTOM_CYCLE_STF;
1.1.1.13 root 608: RestartVideoCounterCycle = RESTART_VIDEO_COUNTER_CYCLE_STF;
609: VblVideoCycleOffset = VBL_VIDEO_CYCLE_OFFSET_STF;
1.1.1.12 root 610: }
611:
612: else /* STE, Falcon, TT */
613: {
614: LineRemoveTopCycle = LINE_REMOVE_TOP_CYCLE_STE;
615: LineRemoveBottomCycle = LINE_REMOVE_BOTTOM_CYCLE_STE;
1.1.1.13 root 616: RestartVideoCounterCycle = RESTART_VIDEO_COUNTER_CYCLE_STE;
617: VblVideoCycleOffset = VBL_VIDEO_CYCLE_OFFSET_STE;
1.1.1.12 root 618: }
619: }
620:
621:
622: /*-----------------------------------------------------------------------*/
1.1.1.11 root 623: /**
1.1.1.15 root 624: * Convert the elapsed number of cycles since the start of the VBL
625: * into the corresponding HBL number and the cycle position in the current
626: * HBL. We use the starting cycle position of the closest HBL to compute
627: * the cycle position on the line (this allows to mix lines with different
628: * values for nCyclesPerLine).
629: * We can have 2 cases on the limit where the real video line count can be
630: * different from nHBL :
631: * - when reading video address between cycle 0 and 12, LineCycle will be <0,
632: * so we need to use the data from line nHBL-1
633: * - if LineCycle >= nCyclesPerLine, this means the HBL int was not processed
634: * yet, so the video line number is in fact nHBL+1
635: */
636:
637: void Video_ConvertPosition ( int FrameCycles , int *pHBL , int *pLineCycles )
638: {
1.1.1.16 root 639: if ( 0 && FrameCycles >= CyclesPerVBL ) /* rare case between end of last hbl and start of next VBL (during 64 cycles) */
1.1.1.15 root 640: {
1.1.1.16 root 641: *pHBL = ( FrameCycles - CyclesPerVBL ) / nCyclesPerLine;
642: *pLineCycles = ( FrameCycles - CyclesPerVBL ) % nCyclesPerLine;
643: //fprintf ( stderr , "out of vbl FrameCycles %d CyclesPerVBL %d nHBL=%d %d %d\n" , FrameCycles , CyclesPerVBL, nHBL , *pHBL , *pLineCycles );
1.1.1.15 root 644: }
1.1.1.16 root 645:
646: else /* most common case */
1.1.1.15 root 647: {
1.1.1.16 root 648: *pHBL = nHBL;
649: *pLineCycles = FrameCycles - ShifterFrame.ShifterLines[ nHBL ].StartCycle;
1.1.1.15 root 650:
1.1.1.16 root 651: if ( *pLineCycles < 0 ) /* reading from the previous video line */
652: {
653: *pHBL = nHBL-1;
654: *pLineCycles = FrameCycles - ShifterFrame.ShifterLines[ nHBL-1 ].StartCycle;
655: }
656:
657: else if ( *pLineCycles >= nCyclesPerLine ) /* reading on the next line, but HBL int was delayed */
658: {
659: *pHBL = nHBL+1;
660: *pLineCycles -= nCyclesPerLine;
661: }
662: }
1.1.1.15 root 663:
664: if ( *pLineCycles < 0 )
665: fprintf ( stderr , "bug nHBL=%d %d %d\n" , nHBL , *pHBL , *pLineCycles );
666:
667: //if ( ( *pHBL != FrameCycles / nCyclesPerLine ) || ( *pLineCycles != FrameCycles % nCyclesPerLine ) )
668: // LOG_TRACE ( TRACE_VIDEO_ADDR , "conv pos %d %d - %d %d\n" , *pHBL , FrameCycles / nCyclesPerLine , *pLineCycles , FrameCycles % nCyclesPerLine );
669: // LOG_TRACE ( TRACE_VIDEO_ADDR , "conv pos %d %d %d\n" , FrameCycles , *pHBL , *pLineCycles );
670: }
671:
672:
673: void Video_GetPosition ( int *pFrameCycles , int *pHBL , int *pLineCycles )
674: {
675: *pFrameCycles = Cycles_GetCounter(CYCLES_COUNTER_VIDEO);
676: Video_ConvertPosition ( *pFrameCycles , pHBL , pLineCycles );
677: }
678:
679:
680: void Video_GetPosition_OnWriteAccess ( int *pFrameCycles , int *pHBL , int *pLineCycles )
681: {
682: *pFrameCycles = Cycles_GetCounterOnWriteAccess(CYCLES_COUNTER_VIDEO);
683: Video_ConvertPosition ( *pFrameCycles , pHBL , pLineCycles );
684: }
685:
686:
687: void Video_GetPosition_OnReadAccess ( int *pFrameCycles , int *pHBL , int *pLineCycles )
688: {
689: *pFrameCycles = Cycles_GetCounterOnReadAccess(CYCLES_COUNTER_VIDEO);
690: Video_ConvertPosition ( *pFrameCycles , pHBL , pLineCycles );
691: }
692:
693:
694: /*-----------------------------------------------------------------------*/
695: /**
1.1.1.11 root 696: * Calculate and return video address pointer.
697: */
1.1.1.15 root 698: static Uint32 Video_CalculateAddress ( void )
1.1 root 699: {
1.1.1.15 root 700: int FrameCycles, HblCounterVideo, LineCycles;
701: int X, NbBytes;
1.1.1.11 root 702: Uint32 VideoAddress; /* Address of video display in ST screen space */
703: int nSyncByte;
704: int LineBorderMask;
705: int PrevSize;
706: int CurSize;
1.1.1.15 root 707: int LineStartCycle , LineEndCycle;
708:
1.1.1.11 root 709:
710: /* Find number of cycles passed during frame */
711: /* We need to substract '12' for correct video address calculation */
1.1.1.15 root 712: FrameCycles = Cycles_GetCounterOnReadAccess(CYCLES_COUNTER_VIDEO) - 12;
1.1.1.11 root 713:
714: /* Now find which pixel we are on (ignore left/right borders) */
1.1.1.15 root 715: Video_ConvertPosition ( FrameCycles , &HblCounterVideo , &LineCycles );
716: X = LineCycles;
1.1.1.11 root 717:
718: nSyncByte = IoMem_ReadByte(0xff820a) & 2; /* only keep bit 1 */
719: if (nSyncByte) /* 50 Hz */
720: {
721: LineStartCycle = LINE_START_CYCLE_50;
722: LineEndCycle = LINE_END_CYCLE_50;
723: }
724: else /* 60 Hz */
725: {
726: LineStartCycle = LINE_START_CYCLE_60;
727: LineEndCycle = LINE_END_CYCLE_60;
728: }
729:
730:
731: /* Top of screen is usually 63 lines from VBL in 50 Hz */
1.1.1.15 root 732: if ( HblCounterVideo < nStartHBL )
1.1.1.11 root 733: {
734: /* pVideoRaster was set during Video_ClearOnVBL using VideoBase */
735: /* and it could also have been modified on STE by writing to ff8205/07/09 */
1.1.1.15 root 736: /* So, we should not use ff8201/ff8203 which are reloaded in ff8205/ff8207 only once per VBL */
737: /* but use pVideoRaster - STRam instead to get current shifter video address */
1.1.1.11 root 738: VideoAddress = pVideoRaster - STRam;
739: }
740:
1.1.1.15 root 741: else if (FrameCycles > RestartVideoCounterCycle)
1.1.1.11 root 742: {
743: /* This is where ff8205/ff8207 are reloaded with the content of ff8201/ff8203 on a real ST */
744: /* (used in ULM DSOTS demos). VideoBase is also reloaded in Video_ClearOnVBL to be sure */
745: VideoBase = (Uint32)IoMem_ReadByte(0xff8201)<<16 | (Uint32)IoMem_ReadByte(0xff8203)<<8;
746: if (ConfigureParams.System.nMachineType != MACHINE_ST)
747: {
748: /* on STe 2 aligned, on Falcon 4 aligned, on TT 8 aligned. We do STe. */
749: VideoBase |= IoMem_ReadByte(0xff820d) & ~1;
750: }
751:
752: VideoAddress = VideoBase;
753: }
754:
755: else
756: {
757: VideoAddress = pVideoRaster - STRam; /* pVideoRaster is updated by Video_CopyScreenLineColor */
758:
759: /* Now find which pixel we are on (ignore left/right borders) */
1.1.1.15 root 760: // X = ( Cycles_GetCounterOnReadAccess(CYCLES_COUNTER_VIDEO) - 12 ) % nCyclesPerLine;
1.1.1.11 root 761:
762: /* Get real video line count (can be different from nHBL) */
1.1.1.15 root 763: // HblCounterVideo = ( Cycles_GetCounterOnReadAccess(CYCLES_COUNTER_VIDEO) - 12 ) / nCyclesPerLine;
1.1.1.11 root 764:
765: /* Correct the case when read overlaps end of line / start of next line */
766: /* Video_CopyScreenLineColor was not called yet to update VideoAddress */
767: /* so we need to determine the size of the previous line to get the */
768: /* correct value of VideoAddress. */
769: PrevSize = 0;
770: if ( HblCounterVideo < nHBL )
771: X = 0;
772: else if ( ( HblCounterVideo > nHBL ) /* HblCounterVideo = nHBL+1 */
773: && ( nHBL >= nStartHBL ) ) /* if nHBL was not visible, PrevSize = 0 */
774: {
1.1.1.15 root 775: LineBorderMask = ShifterFrame.ShifterLines[ HblCounterVideo-1 ].BorderMask; /* get border mask for nHBL */
1.1.1.11 root 776: PrevSize = BORDERBYTES_NORMAL; /* normal line */
777:
778: if (LineBorderMask & BORDERMASK_LEFT_OFF)
779: PrevSize += BORDERBYTES_LEFT;
780: else if (LineBorderMask & BORDERMASK_LEFT_PLUS_2)
781: PrevSize += 2;
782:
783: if (LineBorderMask & BORDERMASK_STOP_MIDDLE)
784: PrevSize -= 106;
785: else if (LineBorderMask & BORDERMASK_RIGHT_MINUS_2)
786: PrevSize -= 2;
787: else if (LineBorderMask & BORDERMASK_RIGHT_OFF)
788: PrevSize += BORDERBYTES_RIGHT;
789:
790: if (LineBorderMask & BORDERMASK_EMPTY_LINE)
791: PrevSize = 0;
792: }
793:
794:
1.1.1.15 root 795: LineBorderMask = ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask;
1.1.1.11 root 796:
797: CurSize = BORDERBYTES_NORMAL; /* normal line */
798:
799: if (LineBorderMask & BORDERMASK_LEFT_OFF)
800: CurSize += BORDERBYTES_LEFT;
801: else if (LineBorderMask & BORDERMASK_LEFT_PLUS_2)
802: CurSize += 2;
1.1.1.16 root 803: else if (bSteBorderFlag) /* bigger line by 8 bytes on the left (STE specific) */
804: CurSize += 8;
805: else if ( ( HWScrollCount > 0 ) && ( HWScrollPrefetch == 1 ) )
806: CurSize += 8; /* 8 more bytes are loaded when scrolling with prefetching */
1.1.1.11 root 807:
808: if (LineBorderMask & BORDERMASK_STOP_MIDDLE)
809: CurSize -= 106;
810: else if (LineBorderMask & BORDERMASK_RIGHT_MINUS_2)
811: CurSize -= 2;
812: else if (LineBorderMask & BORDERMASK_RIGHT_OFF)
813: CurSize += BORDERBYTES_RIGHT;
814: if (LineBorderMask & BORDERMASK_RIGHT_OFF_FULL)
815: CurSize += BORDERBYTES_RIGHT_FULL;
816:
817: if ( LineBorderMask & BORDERMASK_LEFT_PLUS_2)
818: LineStartCycle = LINE_START_CYCLE_60;
819: else if ( LineBorderMask & BORDERMASK_LEFT_OFF )
1.1.1.15 root 820: LineStartCycle = LINE_START_CYCLE_71;
1.1.1.16 root 821: else if ( bSteBorderFlag )
822: LineStartCycle -= 16; /* display starts 16 pixels earlier */
823: else if ( ( HWScrollCount > 0 ) && ( HWScrollPrefetch == 1 ) )
824: LineStartCycle -= 16; /* shifter starts reading 16 pixels earlier when scrolling with prefetching */
1.1.1.11 root 825:
826: LineEndCycle = LineStartCycle + CurSize*2;
827:
828:
829: if ( X < LineStartCycle )
1.1.1.16 root 830: X = LineStartCycle; /* display is disabled in the left border */
1.1.1.11 root 831: else if ( X > LineEndCycle )
1.1.1.16 root 832: {
833: X = LineEndCycle; /* display is disabled in the right border */
834: /* On STE, the Shifter skips the given amount of words as soon as display is disabled */
835: /* (LineWidth is 0 on STF */
836: VideoAddress += LineWidth*2;
837: }
1.1.1.11 root 838:
839: NbBytes = ( (X-LineStartCycle)>>1 ) & (~1); /* 2 cycles per byte */
840:
841:
842: /* when left border is open, we have 2 bytes less than theorical value */
843: /* (26 bytes in left border, which is not a multiple of 4 cycles) */
844: if ( LineBorderMask & BORDERMASK_LEFT_OFF )
845: NbBytes -= 2;
846:
847: if ( LineBorderMask & BORDERMASK_EMPTY_LINE )
848: NbBytes = 0;
849:
1.1.1.16 root 850: /* Add line cycles if we have not reached end of screen yet */
1.1.1.15 root 851: if ( HblCounterVideo < nEndHBL )
1.1.1.11 root 852: VideoAddress += PrevSize + NbBytes;
853: }
854:
1.1.1.16 root 855: LOG_TRACE(TRACE_VIDEO_ADDR , "video base=%x raster=%x addr=%x video_cyc=%d "
856: "line_cyc=%d/X=%d @ nHBL=%d/video_hbl=%d %d<->%d pc=%x instr_cyc=%d\n",
857: VideoBase, (int)(pVideoRaster - STRam), VideoAddress,
858: Cycles_GetCounter(CYCLES_COUNTER_VIDEO), LineCycles, X, nHBL,
859: HblCounterVideo, LineStartCycle, LineEndCycle, M68000_GetPC(), CurrentInstrCycles);
1.1.1.11 root 860:
861: return VideoAddress;
862: }
863:
864:
865: /*-----------------------------------------------------------------------*/
866: /**
1.1.1.16 root 867: * Calculate the cycle where the STF/STE's MMU starts reading
868: * data to send them to the shifter.
869: * On STE, if hscroll is used, prefetch will cause this position to
870: * happen 16 cycles earlier.
871: * This function should use the same logic as in Video_CalculateAddress.
872: * NOTE : this function is not completly accurate, as even when there's
873: * no hscroll (on STF) the mmu starts reading 16 cycles before display starts.
874: * But it's good enough to emulate writing to ff8205/07/09 on STE.
875: */
876: static int Video_GetMMUStartCycle ( int DisplayStartCycle )
877: {
878: if ( bSteBorderFlag )
879: DisplayStartCycle -= 16; /* display starts 16 pixels earlier */
880: else if ( ( HWScrollCount > 0 ) && ( HWScrollPrefetch == 1 ) )
881: DisplayStartCycle -= 16; /* shifter starts reading 16 pixels earlier when scrolling with prefetching */
882:
883: return DisplayStartCycle;
884: }
885:
886:
887: /*-----------------------------------------------------------------------*/
888: /**
1.1.1.11 root 889: * Write to VideoShifter (0xff8260), resolution bits
890: */
1.1.1.15 root 891: static void Video_WriteToShifter ( Uint8 Res )
1.1 root 892: {
1.1.1.15 root 893: int FrameCycles, HblCounterVideo, LineCycles;
1.1.1.11 root 894:
1.1.1.15 root 895: Video_GetPosition_OnWriteAccess ( &FrameCycles , &HblCounterVideo , &LineCycles );
1.1.1.11 root 896:
1.1.1.15 root 897: 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",
898: Res, FrameCycles, LineCycles, nHBL, HblCounterVideo, M68000_GetPC(), CurrentInstrCycles );
1.1.1.11 root 899:
900:
1.1.1.13 root 901: /* Ignore consecutive writes of the same value */
1.1.1.15 root 902: if ( Res == ShifterFrame.Res )
1.1.1.13 root 903: return; /* do nothing */
904:
1.1.1.15 root 905:
906: if ( Res == 0x02 ) /* switch to high res */
907: {
908: if ( LineCycles < ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle ) /* start could be 0,52,56 */
909: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle = LINE_START_CYCLE_71;
910:
911: if ( ( LineCycles < ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle ) /* end could be 160,372,376,460 */
912: && ( LineCycles < LINE_END_CYCLE_71 ) )
913: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle = LINE_END_CYCLE_71;
914: }
915: else /* switch to lo/med res */
916: {
917: /* In lo/med res, display start/end depends on the freq register in $ff820a */
918: Video_Sync_SetDefaultStartEnd ( IoMem[0xff820a] & 2 , HblCounterVideo , LineCycles );
919: }
920:
921:
1.1.1.11 root 922: /* Remove left border : +26 bytes */
1.1.1.15 root 923: /* This can be done with a hi/lo res switch or a hi/med res switch */
924: if ( ( ShifterFrame.Res == 0x02 ) && ( Res == 0x00 ) /* switched from hi res to lo res */
1.1.1.16 root 925: // && ( LineCycles >= 12 ) /* switch back to low res should be after cycle 8 */
1.1.1.15 root 926: && ( LineCycles <= (LINE_START_CYCLE_71+28) )
1.1.1.17! root 927: && ( FrameCycles - ShifterFrame.ResPosHi.FrameCycles <= 32 ) )
1.1.1.15 root 928: {
1.1.1.17! root 929: if ( ( ( ConfigureParams.System.nMachineType == MACHINE_STE ) /* special case for 504/4 on STE -> add 20 bytes to left border */
! 930: || ( ConfigureParams.System.nMachineType == MACHINE_MEGA_STE ) )
1.1.1.16 root 931: && ( ShifterFrame.ResPosHi.LineCycles == 504 ) && ( LineCycles == 4 ) )
932: {
933: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_LEFT_OFF_2_STE;
934: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle = LINE_START_CYCLE_71+16; /* starts 16 pixels later */
1.1.1.17! root 935: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayPixelShift = -8; /* screen is shifted 8 pixels to the left */
1.1.1.16 root 936: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect remove left 2 ste %d<->%d\n" ,
937: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
938: }
939: else /* other case for STF/STE -> add 26 bytes */
940: {
941: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_LEFT_OFF;
942: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle = LINE_START_CYCLE_71;
943: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayPixelShift = -4; /* screen is shifted 4 pixels to the left */
944: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect remove left %d<->%d\n" ,
945: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
946: }
1.1.1.15 root 947: }
948:
949: if ( ( ShifterFrame.Res == 0x02 ) && ( Res == 0x01 ) /* switched from hi res to med res */
950: && ( LineCycles <= (LINE_START_CYCLE_71+20) )
951: && ( FrameCycles - ShifterFrame.ResPosHi.FrameCycles <= 30 ) )
952: {
953: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_LEFT_OFF_MED; /* a later switch to low res might gives right scrolling */
954: /* By default, this line will be in med res, except if we detect hardware scrolling later */
955: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_OVERSCAN_MED_RES | ( 2 << 20 );
956: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle = LINE_START_CYCLE_71;
957: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect remove left med %d<->%d\n" ,
958: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
959: }
960:
961: /* Empty line switching res on STF : switch to hi res on cycle 28, then go back to med/lo res */
962: /* This creates a 0 byte line, the video counter won't change for this line */
963: else if ( ( ShifterFrame.Res == 0x02 ) /* switched from hi res */
964: && ( FrameCycles - ShifterFrame.ResPosHi.FrameCycles <= 16 )
965: && ( ShifterFrame.ResPosHi.LineCycles == LINE_EMPTY_CYCLE_71_STF )
966: && ( ConfigureParams.System.nMachineType == MACHINE_ST ) )
967: {
968: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_EMPTY_LINE;
969: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle = 0;
970: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle = 0;
971: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect empty line res %d<->%d\n" ,
972: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
973: }
974:
975: /* Empty line switching res on STE (switch is 4 cycles later than on STF) */
976: else if ( ( ShifterFrame.Res == 0x02 ) /* switched from hi res */
977: && ( FrameCycles - ShifterFrame.ResPosHi.FrameCycles <= 16 )
978: && ( ShifterFrame.ResPosHi.LineCycles == LINE_EMPTY_CYCLE_71_STE )
1.1.1.17! root 979: && ( ( ConfigureParams.System.nMachineType == MACHINE_STE )
! 980: || ( ConfigureParams.System.nMachineType == MACHINE_MEGA_STE ) ) )
1.1.1.15 root 981: {
982: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_EMPTY_LINE;
983: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle = 0;
984: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle = 0;
985: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect empty line res %d<->%d\n" ,
986: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
987: }
988:
989: /* Empty line switching res on STF : switch to hi res just before the HBL then go back to lo/med res */
1.1.1.16 root 990: /* Next HBL will be an ampty line (used in 'No Buddies Land') */
1.1.1.15 root 991: else if ( ( ShifterFrame.Res == 0x02 ) /* switched from hi res */
992: && ( ShifterFrame.ResPosHi.LineCycles == 500 )
993: && ( LineCycles == 508 ) )
994: {
1.1.1.16 root 995: ShifterFrame.ShifterLines[ HblCounterVideo+1 ].BorderMask |= BORDERMASK_EMPTY_LINE;
996: ShifterFrame.ShifterLines[ HblCounterVideo+1 ].DisplayStartCycle = 0;
997: ShifterFrame.ShifterLines[ HblCounterVideo+1 ].DisplayEndCycle = 0;
998: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect empty line res 2 %d<->%d for nHBL=%d\n" ,
999: ShifterFrame.ShifterLines[ HblCounterVideo+1 ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo+1 ].DisplayEndCycle , nHBL+1 );
1.1.1.15 root 1000: }
1001:
1002: /* Start right border near middle of the line : -106 bytes */
1003: /* Switch to hi res just before the start of the right border in hi res, then go back to lo/mid res */
1004: if ( ( ShifterFrame.Res == 0x02 ) /* switched from hi res */
1005: && ( ShifterFrame.ResPosHi.HBL == HblCounterVideo ) /* switch during the same line */
1006: && ( ShifterFrame.ResPosHi.LineCycles <= LINE_END_CYCLE_71+4 ) /* switched to hi res before cycle 164 */
1007: && ( LineCycles >= LINE_END_CYCLE_71+4 ) ) /* switch to lo res after cycle 164 */
1008: {
1009: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_STOP_MIDDLE;
1010: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle = LINE_END_CYCLE_71;
1011: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect stop middle %d<->%d\n" ,
1012: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
1013: }
1014:
1015: /* Remove right border a second time after removing it a first time. Display will */
1016: /* stop at cycle 512 instead of 460. */
1017: /* This removes left border on next line too (used in 'Enchanted Lands') */
1.1.1.16 root 1018: /* If right border was not removed, then we will get an empty line for the next HBL (used in Beyond by Kruz) */
1019: if ( ( ShifterFrame.Res == 0x02 ) /* switched from hi res */
1020: && ( LineCycles > LINE_END_CYCLE_50_2 ) /* switch to low just after end of right border */
1021: && ( ShifterFrame.ResPosHi.LineCycles <= LINE_END_CYCLE_50_2 ) /* switch to hi just before end of right border */
1022: && ( FrameCycles - ShifterFrame.ResPosHi.FrameCycles <= 20 ) )
1023: {
1024: if ( ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask & BORDERMASK_RIGHT_OFF ) /* Enchanted Lands */
1025: {
1026: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_RIGHT_OFF_FULL;
1027: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle = LINE_END_CYCLE_FULL;
1028: ShifterFrame.ShifterLines[ HblCounterVideo+1 ].BorderMask |= BORDERMASK_LEFT_OFF; /* no left border on next line */
1029: ShifterFrame.ShifterLines[ HblCounterVideo+1 ].DisplayStartCycle = LINE_START_CYCLE_71;
1030: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect remove right full %d<->%d\n" ,
1031: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
1032: }
1033: else /* Pax Plax Parralax in Beyond by Kruz */
1034: {
1035: ShifterFrame.ShifterLines[ HblCounterVideo+1 ].BorderMask = BORDERMASK_EMPTY_LINE;
1036: ShifterFrame.ShifterLines[ HblCounterVideo+1 ].DisplayStartCycle = 0;
1037: ShifterFrame.ShifterLines[ HblCounterVideo+1 ].DisplayEndCycle = 0;
1038: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect empty line res 3 %d<->%d for nHBL=%d\n" ,
1039: ShifterFrame.ShifterLines[ HblCounterVideo+1 ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo+1 ].DisplayEndCycle , nHBL+1 );
1040: }
1.1.1.15 root 1041: }
1042:
1043: /* If left border is opened and we switch to medium resolution during the next cycles, */
1044: /* then we assume a med res overscan line instead of a low res overscan line. */
1045: /* Note that in that case, the switch to med res can shift the display by 0-3 words */
1.1.1.11 root 1046: /* Used in 'No Cooper' greetings by 1984 and 'Punish Your Machine' by Delta Force */
1.1.1.15 root 1047: if ( ( ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask & BORDERMASK_LEFT_OFF )
1048: && ( Res == 0x01 ) )
1.1.1.11 root 1049: {
1.1.1.15 root 1050: if ( LineCycles == LINE_LEFT_MED_CYCLE_1 ) /* 'No Cooper' timing */
1.1.1.11 root 1051: {
1.1.1.15 root 1052: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect med res overscan offset 0 byte\n" );
1053: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_OVERSCAN_MED_RES | ( 0 << 20 );
1.1.1.11 root 1054: }
1.1.1.15 root 1055: else if ( LineCycles == LINE_LEFT_MED_CYCLE_2 ) /* 'Best Part Of The Creation / PYM' timing */
1.1.1.11 root 1056: {
1.1.1.15 root 1057: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect med res overscan offset 2 bytes\n" );
1058: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_OVERSCAN_MED_RES | ( 2 << 20 );
1.1.1.11 root 1059: }
1060: }
1061:
1.1.1.15 root 1062: /* If left border was opened with a hi/med res switch we need to check */
1063: /* if the switch to low res can trigger a right hardware scrolling. */
1064: /* We store the pixels count in DisplayPixelShift */
1065: if ( ( ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask & BORDERMASK_LEFT_OFF_MED )
1066: && ( Res == 0x00 ) && ( LineCycles <= LINE_SCROLL_1_CYCLE_50 ) )
1.1.1.11 root 1067: {
1.1.1.15 root 1068: /* The hi/med switch was a switch to do low res hardware scrolling, */
1069: /* so we must cancel the med res overscan bit. */
1070: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask &= (~BORDERMASK_OVERSCAN_MED_RES);
1.1.1.11 root 1071:
1.1.1.15 root 1072: if ( LineCycles == LINE_SCROLL_13_CYCLE_50 ) /* cycle 20 */
1.1.1.11 root 1073: {
1.1.1.15 root 1074: LOG_TRACE(TRACE_VIDEO_BORDER_H , "detect 13 pixels right scroll\n" );
1075: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayPixelShift = 13;
1.1.1.11 root 1076: }
1.1.1.15 root 1077: else if ( LineCycles == LINE_SCROLL_9_CYCLE_50 ) /* cycle 24 */
1.1.1.11 root 1078: {
1.1.1.15 root 1079: LOG_TRACE(TRACE_VIDEO_BORDER_H , "detect 9 pixels right scroll\n" );
1080: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayPixelShift = 9;
1.1.1.11 root 1081: }
1.1.1.15 root 1082: else if ( LineCycles == LINE_SCROLL_5_CYCLE_50 ) /* cycle 28 */
1.1.1.11 root 1083: {
1.1.1.15 root 1084: LOG_TRACE(TRACE_VIDEO_BORDER_H , "detect 5 pixels right scroll\n" );
1085: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayPixelShift = 5;
1.1.1.11 root 1086: }
1.1.1.15 root 1087: else if ( LineCycles == LINE_SCROLL_1_CYCLE_50 ) /* cycle 32 */
1.1.1.11 root 1088: {
1.1.1.15 root 1089: LOG_TRACE(TRACE_VIDEO_BORDER_H , "detect 1 pixel right scroll\n" );
1090: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayPixelShift = 1;
1.1.1.11 root 1091: }
1092: }
1093:
1.1.1.15 root 1094:
1095: /* Update HBL's position only if display has not reached pos LINE_START_CYCLE_50 */
1096: /* and HBL interrupt was already handled at the beginning of this line. */
1097: /* This also changes the number of cycles per line. */
1098: if ( ( LineCycles <= LINE_START_CYCLE_50 ) && ( HblCounterVideo == nHBL ) )
1099: {
1100: nCyclesPerLine = Video_HBL_GetPos();
1101: Video_AddInterruptHBL ( nCyclesPerLine );
1102: }
1103:
1104:
1105: /* Update Timer B's position */
1106: LineTimerBCycle = Video_TimerB_GetPos ( HblCounterVideo );
1107: Video_AddInterruptTimerB ( LineTimerBCycle );
1108:
1109:
1110: ShifterFrame.Res = Res;
1111: if ( Res == 0x02 ) /* high res */
1112: {
1113: ShifterFrame.ResPosHi.VBL = nVBLs;
1114: ShifterFrame.ResPosHi.FrameCycles = FrameCycles;
1115: ShifterFrame.ResPosHi.HBL = HblCounterVideo;
1116: ShifterFrame.ResPosHi.LineCycles = LineCycles;
1117: }
1118: else if ( Res == 0x01 ) /* med res */
1119: {
1120: ShifterFrame.ResPosMed.VBL = nVBLs;
1121: ShifterFrame.ResPosMed.FrameCycles = FrameCycles;
1122: ShifterFrame.ResPosMed.HBL = HblCounterVideo;
1123: ShifterFrame.ResPosMed.LineCycles = LineCycles;
1124: }
1125: else /* low res */
1126: {
1127: ShifterFrame.ResPosLo.VBL = nVBLs;
1128: ShifterFrame.ResPosLo.FrameCycles = FrameCycles;
1129: ShifterFrame.ResPosLo.HBL = HblCounterVideo;
1130: ShifterFrame.ResPosLo.LineCycles = LineCycles;
1131: }
1132: }
1133:
1134:
1135:
1136: /*-----------------------------------------------------------------------*/
1137: /**
1138: * Set some default values for DisplayStartCycle/DisplayEndCycle
1139: * when changing frequency in lo/med res (testing orders are important
1140: * because the line can already have some borders changed).
1141: * This is necessary as some freq changes can modify start/end
1142: * even if they're not made at the exact borders' positions.
1143: * These values will be modified later if some borders are changed.
1144: */
1145: static void Video_Sync_SetDefaultStartEnd ( Uint8 Freq , int HblCounterVideo , int LineCycles )
1146: {
1147: if ( Freq == 0x02 ) /* switch to 50 Hz */
1148: {
1149: if ( ( LineCycles <= ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle ) /* start could be 0,52,56 */
1150: && ( ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle == LINE_START_CYCLE_60 ) )
1151: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle = LINE_START_CYCLE_50;
1152:
1153: if ( ( LineCycles <= ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle ) /* end could be 160,372,376,460 */
1154: && ( ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle < LINE_END_CYCLE_50 ) )
1155: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle = LINE_END_CYCLE_50;
1156: }
1157:
1158: else /* switch to 60 Hz */
1159: {
1160: if ( LineCycles < ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle ) /* start could be 0,52,56 */
1161: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle = LINE_START_CYCLE_60;
1162:
1163: if ( ( LineCycles < ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle ) /* end could be 160,372,376,460 */
1164: && ( ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle <= LINE_END_CYCLE_50 ) )
1165: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle = LINE_END_CYCLE_60;
1166: }
1167:
1168: //fprintf ( stderr , "sync default pos %d %d\n", ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
1.1.1.11 root 1169: }
1170:
1171:
1172: /*-----------------------------------------------------------------------*/
1173: /**
1174: * Write to VideoSync (0xff820a), Hz setting
1175: */
1.1.1.15 root 1176: void Video_Sync_WriteByte ( void )
1.1 root 1177: {
1.1.1.15 root 1178: int FrameCycles, HblCounterVideo, LineCycles;
1179: Uint8 Freq;
1.1.1.11 root 1180:
1181:
1.1.1.15 root 1182: if ( bUseVDIRes )
1183: return; /* no 50/60 Hz freq in VDI mode */
1.1.1.11 root 1184:
1185:
1.1.1.15 root 1186: /* We're only interested in bit 1 (50/60Hz) */
1187: Freq = IoMem[0xff820a] & 2;
1.1.1.11 root 1188:
1.1.1.15 root 1189: Video_GetPosition_OnWriteAccess ( &FrameCycles , &HblCounterVideo , &LineCycles );
1190:
1191: 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",
1192: Freq, FrameCycles, LineCycles, nHBL, HblCounterVideo, M68000_GetPC(), CurrentInstrCycles );
1.1.1.11 root 1193:
1.1.1.13 root 1194: /* Ignore consecutive writes of the same value */
1.1.1.15 root 1195: if ( Freq == ShifterFrame.Freq )
1.1.1.13 root 1196: return; /* do nothing */
1197:
1.1.1.15 root 1198: /* Ignore freq changes if we are in high res */
1199: /* 2009/04/26 : don't ignore for now (see ST Cnx in Punish Your Machine) */
1200: // if ( ShifterFrame.Res == 0x02 )
1201: // return; /* do nothing */
1202:
1203: /* Set some default values for DisplayStartCycle/DisplayEndCycle before checking for border removal */
1204: Video_Sync_SetDefaultStartEnd ( Freq , HblCounterVideo , LineCycles );
1205:
1206:
1207: if ( ( ShifterFrame.Freq == 0x00 ) && ( Freq == 0x02 ) /* switched from 60 Hz to 50 Hz ? */
1208: // && ( ShifterFrame.FreqPos60.VBL == nVBLs ) /* switched during the same VBL */
1209: && ( HblCounterVideo >= nStartHBL ) /* only if display is on */
1210: && ( HblCounterVideo < nEndHBL ) ) /* only if display is on */
1211: {
1212: /* Add 2 bytes to left border : switch to 60 Hz before LINE_START_CYCLE_60 to force an early start */
1213: /* of the DE signal, then go back to 50 Hz. Note that depending on where the 50 Hz switch is made */
1214: /* the HBL signal will be at position 508 (60 Hz line) or 512 (50 Hz line) */
1215: /* Obtaining a +2 line with 512 cycles requires a 2 cycles precision and is "wake up" state dependant */
1216: if ( ( ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle == LINE_START_CYCLE_60 )
1217: && ( LineCycles >= LINE_START_CYCLE_50 ) /* The line started in 60 Hz and continues in 50 Hz */
1218: && ( LineCycles <= ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle ) ) /* change when line is active */
1.1.1.11 root 1219: {
1.1.1.15 root 1220: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_LEFT_PLUS_2;
1221: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle = LINE_END_CYCLE_50;
1222: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect left+2 %d<->%d\n" ,
1223: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
1.1.1.11 root 1224: }
1225:
1.1.1.15 root 1226: /* Empty line switching freq : start the line in 50 Hz, change to 60 Hz at the exact place */
1227: /* where display is enabled in 50 Hz, then go back to 50 Hz. */
1228: /* Due to 4 cycles precision instead of 2, we must accept a 60 Hz switch at pos 56 or 56+4 */
1229: else if ( ( FrameCycles - ShifterFrame.FreqPos60.FrameCycles <= 24 )
1230: && ( ( ShifterFrame.FreqPos60.LineCycles == LINE_START_CYCLE_50 ) || ( ShifterFrame.FreqPos60.LineCycles == LINE_START_CYCLE_50+4 ) )
1231: && ( LineCycles > LINE_START_CYCLE_50 ) )
1232: {
1233: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_EMPTY_LINE;
1234: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle = 0;
1235: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle = 0;
1236: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect empty line freq %d<->%d\n" ,
1237: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
1.1.1.11 root 1238: }
1.1.1.15 root 1239:
1240: /* Remove 2 bytes to the right : start the line in 50 Hz (pos 0 or 56), change to 60 Hz before the position */
1241: /* where display is disabled in 60 Hz, then go back to 50 Hz */
1242: if ( ( LineCycles > LINE_END_CYCLE_60 ) /* back to 50 Hz after end of 60 Hz line */
1243: && ( ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle != LINE_START_CYCLE_60 ) /* start could be 0 or 56 */
1244: && ( ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle == LINE_END_CYCLE_60 ) )
1245: {
1246: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_RIGHT_MINUS_2;
1247: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect right-2 %d<->%d\n" ,
1248: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
1249: }
1250:
1.1.1.11 root 1251: }
1252:
1.1.1.15 root 1253:
1254: if ( ( ShifterFrame.Freq == 0x02 && Freq == 0x00 ) /* switched from 50 Hz to 60 Hz ? */
1255: && ( HblCounterVideo >= nStartHBL ) /* only if display is on */
1256: && ( HblCounterVideo < nEndHBL ) ) /* only if display is on */
1257: {
1258: /* remove right border, display 44 bytes more : switch to 60 Hz at the position where */
1259: /* the line ends in 50 Hz. Some programs don't switch back to 50 Hz immediatly */
1260: /* (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 */
1261: if ( ( LineCycles == LINE_END_CYCLE_50 )
1262: && ( ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle == LINE_END_CYCLE_50 ) )
1263: {
1264: ShifterFrame.ShifterLines[ HblCounterVideo ].BorderMask |= BORDERMASK_RIGHT_OFF;
1.1.1.16 root 1265: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle = LINE_END_CYCLE_NO_RIGHT;
1.1.1.15 root 1266: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect remove right %d<->%d\n" ,
1267: ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayStartCycle , ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle );
1.1.1.11 root 1268: }
1269: }
1270:
1271:
1272: /* Store cycle position of freq 50/60 to check for top/bottom border removal in Video_EndHBL. */
1.1.1.15 root 1273: if ( Freq == 0x02 ) /* switch to 50 Hz */
1.1.1.11 root 1274: {
1.1.1.13 root 1275: if ( ( HblCounterVideo < VIDEO_START_HBL_50HZ ) /* nStartHBL can change only if display is not ON yet */
1276: && ( OverscanMode & OVERSCANMODE_TOP ) == 0 ) /* update only if top was not removed */
1277: nStartHBL = VIDEO_START_HBL_50HZ;
1.1.1.11 root 1278:
1.1.1.13 root 1279: if ( ( HblCounterVideo < VIDEO_END_HBL_50HZ ) /* nEndHBL can change only if display is not OFF yet */
1.1.1.11 root 1280: && ( OverscanMode & OVERSCANMODE_BOTTOM ) == 0 ) /* update only if bottom was not removed */
1.1.1.13 root 1281: nEndHBL = VIDEO_END_HBL_50HZ; /* 263 */
1.1.1.11 root 1282: }
1.1.1.15 root 1283: else if ( Freq == 0x00 ) /* switch to 60 Hz */
1.1.1.11 root 1284: {
1.1.1.13 root 1285: if ( ( HblCounterVideo < VIDEO_START_HBL_60HZ-1 ) /* nStartHBL can change only if display is not ON yet */
1.1.1.15 root 1286: || ( ( HblCounterVideo == VIDEO_START_HBL_60HZ-1 ) && ( LineCycles <= LineRemoveTopCycle ) ) )
1.1.1.13 root 1287: nStartHBL = VIDEO_START_HBL_60HZ;
1.1.1.11 root 1288:
1.1.1.13 root 1289: if ( ( HblCounterVideo < VIDEO_END_HBL_60HZ ) /* nEndHBL can change only if display is not OFF yet */
1.1.1.11 root 1290: && ( OverscanMode & OVERSCANMODE_BOTTOM ) == 0 ) /* update only if bottom was not removed */
1.1.1.13 root 1291: nEndHBL = VIDEO_END_HBL_60HZ; /* 234 */
1292: }
1293:
1.1.1.15 root 1294:
1.1.1.13 root 1295: /* If the frequence changed, we need to update the EndLine interrupt */
1.1.1.15 root 1296: /* so that it happens 28 cycles after the current DisplayEndCycle.*/
1.1.1.13 root 1297: /* We check if the change affects the current line or the next one. */
1.1.1.15 root 1298: /* We also need to check if the HBL interrupt and nCyclesPerLine need */
1299: /* to be updated first. */
1300: if ( Freq != ShifterFrame.Freq )
1301: {
1302: /* Update HBL's position only if display has not reached pos LINE_START_CYCLE_50 */
1303: /* and HBL interrupt was already handled at the beginning of this line. */
1304: /* This also changes the number of cycles per line. */
1305: if ( ( LineCycles <= LINE_START_CYCLE_50 ) && ( HblCounterVideo == nHBL ) )
1306: {
1307: nCyclesPerLine = Video_HBL_GetPos();
1308: Video_AddInterruptHBL ( nCyclesPerLine );
1309: }
1310:
1311: /* Update Timer B's position */
1312: LineTimerBCycle = Video_TimerB_GetPos ( HblCounterVideo );
1313: Video_AddInterruptTimerB ( LineTimerBCycle );
1314: }
1315:
1316:
1317: ShifterFrame.Freq = Freq;
1318: if ( Freq == 0x02 ) /* 50 Hz */
1319: {
1320: ShifterFrame.FreqPos50.VBL = nVBLs;
1321: ShifterFrame.FreqPos50.FrameCycles = FrameCycles;
1322: ShifterFrame.FreqPos50.HBL = HblCounterVideo;
1323: ShifterFrame.FreqPos50.LineCycles = LineCycles;
1324: }
1325: else
1326: {
1327: ShifterFrame.FreqPos60.VBL = nVBLs;
1328: ShifterFrame.FreqPos60.FrameCycles = FrameCycles;
1329: ShifterFrame.FreqPos60.HBL = HblCounterVideo;
1330: ShifterFrame.FreqPos60.LineCycles = LineCycles;
1331: }
1332: }
1333:
1334:
1335: /*-----------------------------------------------------------------------*/
1336: /**
1337: * Compute the cycle position where the HBL should happen on each line.
1338: * In low/med res, the position depends on the video frequency (50/60 Hz)
1339: * In high res, the position is always the same.
1340: * This position also gives the number of CPU cycles per video line.
1341: */
1342: static int Video_HBL_GetPos ( void )
1343: {
1344: int Pos;
1345:
1346: if ( ( IoMem_ReadByte ( 0xff8260 ) & 3 ) == 2 ) /* hi res */
1347: Pos = CYCLES_PER_LINE_71HZ;
1348:
1349: else /* low res or med res */
1350: {
1351: if ( IoMem_ReadByte ( 0xff820a ) & 2 ) /* 50 Hz, pos 512 */
1352: Pos = CYCLES_PER_LINE_50HZ;
1353: else /* 60 Hz, pos 508 */
1354: Pos = CYCLES_PER_LINE_60HZ;
1355: }
1356:
1357: return Pos;
1358: }
1359:
1360:
1361: /*-----------------------------------------------------------------------*/
1362: /**
1363: * Compute the cycle position where the timer B should happen on each
1364: * visible line.
1365: * We compute Timer B position for the given LineNumber, using start/end
1366: * display cycles from ShifterLines[ LineNumber ].
1367: * The position depends on the start of line / end of line positions
1368: * (which depend on the current frequency / border tricks) and
1369: * on the value of the bit 3 in the MFP's AER.
1370: * If bit is 0, timer B will count end of line events (usual case),
1371: * but if bit is 1, timer B will count start of line events (eg Seven Gates Of Jambala)
1372: */
1373: int Video_TimerB_GetPos ( int LineNumber )
1374: {
1375: int Pos;
1376:
1377: if ( ( IoMem[0xfffa03] & ( 1 << 3 ) ) == 0 ) /* we're counting end of line events */
1378: {
1379: Pos = ShifterFrame.ShifterLines[ LineNumber ].DisplayEndCycle + TIMERB_VIDEO_CYCLE_OFFSET;
1380: }
1381: else /* we're counting start of line events */
1382: {
1383: Pos = ShifterFrame.ShifterLines[ LineNumber ].DisplayStartCycle + TIMERB_VIDEO_CYCLE_OFFSET;
1384: }
1385:
1386: return Pos;
1387: }
1388:
1389:
1390: /*-----------------------------------------------------------------------*/
1391: /**
1392: * HBL interrupt : this occurs at the end of every line, on cycle 512 (in 50 Hz)
1393: * It takes 56 cycles to handle the 68000's exception.
1394: */
1395: void Video_InterruptHandler_HBL ( void )
1396: {
1397: int FrameCycles = Cycles_GetCounter(CYCLES_COUNTER_VIDEO);
1398: int PendingCyclesOver;
1399: int NewHBLPos;
1400:
1401: /* How many cycle was this HBL delayed (>= 0) */
1402: PendingCyclesOver = -INT_CONVERT_FROM_INTERNAL ( PendingInterruptCount , INT_CPU_CYCLE );
1403:
1404: /* Remove this interrupt from list and re-order */
1.1.1.16 root 1405: CycInt_AcknowledgeInterrupt();
1.1.1.15 root 1406:
1.1.1.17! root 1407: /* Videl Vertical counter increment (To be removed when Videl emulation is finished) */
! 1408: /* VFC is incremented every half line, here, we increment it every line (should be completed) */
! 1409: if (ConfigureParams.System.nMachineType == MACHINE_FALCON) {
! 1410: vfc_counter += 1;
! 1411: }
! 1412:
! 1413:
1.1.1.15 root 1414: /* Increment the hbl jitter index */
1415: HblJitterIndex++;
1416: if ( HblJitterIndex == HBL_JITTER_MAX_POS )
1417: HblJitterIndex = 0;
1418:
1419: LOG_TRACE ( TRACE_VIDEO_HBL , "HBL %d video_cyc=%d pending_cyc=%d jitter=%d\n" ,
1420: nHBL , FrameCycles , PendingCyclesOver , HblJitterArray[ HblJitterIndex ] );
1421:
1422: /* Default cycle position for next HBL */
1423: NewHBLPos = Video_HBL_GetPos();
1424:
1425: /* Generate new HBL, if need to - there are 313 HBLs per frame in 50 Hz */
1426: if (nHBL < nScanlinesPerFrame-1)
1427: Video_AddInterruptHBL ( NewHBLPos );
1428:
1429:
1430: /* We must handle a very special case : if we had a pending HBL that becomes active */
1431: /* because SR is now <= $2100, then we must process an exception for this pending HBL. */
1432: /* But if a "real" (non pending) HBL occurs during the first 56 cycles needed by the */
1433: /* CPU to prepare the exception, we must ignore this HBL signal (instead of considering */
1434: /* this new HBL should be put in pending state to be processed later) */
1435: /* -> any HBL occuring between LastCycleHblException and LastCycleHblException+56 should be ignored */
1436: if ( ( LastCycleHblException != -1 )
1.1.1.17! root 1437: && ( ( FrameCycles - PendingCyclesOver - HblJitterArray[ HblJitterIndex ] ) - LastCycleHblException <= 56 )
! 1438: && ( ( M68000_GetPC() < 0x8280 ) || ( M68000_GetPC() > 0x82b0 ) ) ) /* FIXME : except for European Demos intro where 8280<pc<82b0 */
1.1.1.15 root 1439: {
1440: /* simultaneous case, don't call M68000_Exception */
1441: LOG_TRACE ( TRACE_VIDEO_HBL , "HBL %d video_cyc=%d signal ignored during pending hbl exception at cycle %d\n" ,
1442: nHBL , Cycles_GetCounter(CYCLES_COUNTER_VIDEO) , LastCycleHblException );
1443: LastCycleHblException = -1;
1444: }
1445: else
1446: {
1447: /* "normal" case, this HBL doesn't occur during the processing of a pending HBL */
1.1.1.16 root 1448: M68000_Exception(EXCEPTION_HBLANK , M68000_EXC_SRC_AUTOVEC); /* Horizontal blank interrupt, level 2! */
1.1.1.15 root 1449: }
1450:
1451:
1452: Video_EndHBL(); /* Check some borders removal and copy line to display buffer */
1453:
1.1.1.17! root 1454: DmaSnd_STE_HBL_Update(); /* Update STE DMA sound if needed */
! 1455:
1.1.1.15 root 1456: nHBL++; /* Increase HBL count */
1457:
1458: if (nHBL < nScanlinesPerFrame)
1459: {
1460: /* Update start cycle for next HBL */
1461: ShifterFrame.ShifterLines[ nHBL ].StartCycle = FrameCycles - PendingCyclesOver;
1462: LOG_TRACE(TRACE_VIDEO_HBL, "HBL %d start=%d %x\n", nHBL,
1463: ShifterFrame.ShifterLines[nHBL].StartCycle, ShifterFrame.ShifterLines[nHBL].StartCycle);
1464:
1465: /* Setup next HBL */
1466: Video_StartHBL();
1467: }
1468: }
1469:
1470:
1471: /*-----------------------------------------------------------------------*/
1472: /**
1473: * Check at end of each HBL to see if any Shifter hardware tricks have been attempted
1474: * and copy the line to the screen buffer.
1475: * This is the place to check if top/bottom border were removed, as well as if some
1476: * left/right border changes were not validated before.
1477: * NOTE : the tests must be made with nHBL in ascending order.
1478: */
1479: static void Video_EndHBL(void)
1480: {
1481: //
1482: // Handle top/bottom borders removal when switching freq
1483: //
1484:
1485: /* Remove top border if the switch to 60 Hz was made during this vbl before cycle */
1486: /* LineRemoveTopCycle on line 33 and if the switch to 50 Hz has not yet occured or */
1487: /* occured before the 60 Hz or occured after cycle LineRemoveTopCycle on line 33. */
1488: if ( ( nHBL == VIDEO_START_HBL_60HZ-1 ) /* last HBL before first line of a 60 Hz screen */
1489: && ( ShifterFrame.FreqPos60.VBL == nVBLs ) /* switch to 60 Hz during this VBL */
1490: && ( ( ShifterFrame.FreqPos60.HBL < nHBL ) || ( ShifterFrame.FreqPos60.LineCycles <= LineRemoveTopCycle ) )
1491: && ( ( ShifterFrame.FreqPos50.VBL < nVBLs )
1492: || ( ShifterFrame.FreqPos50.FrameCycles < ShifterFrame.FreqPos60.FrameCycles )
1493: || ( ShifterFrame.FreqPos50.HBL > nHBL )
1494: || ( ( ShifterFrame.FreqPos50.HBL == nHBL ) && ( ShifterFrame.FreqPos50.LineCycles > LineRemoveTopCycle ) ) ) )
1495: {
1496: /* Top border */
1497: LOG_TRACE ( TRACE_VIDEO_BORDER_V , "detect remove top\n" );
1498: OverscanMode |= OVERSCANMODE_TOP; /* Set overscan bit */
1499: nStartHBL = VIDEO_START_HBL_60HZ; /* New start screen line */
1500: pHBLPaletteMasks -= OVERSCAN_TOP; // FIXME useless ?
1501: pHBLPalettes -= OVERSCAN_TOP; // FIXME useless ?
1502: }
1503:
1504: /* Remove bottom border for a 60 Hz screen (tests are similar to the ones for top border) */
1505: else if ( ( nHBL == VIDEO_END_HBL_60HZ-1 ) /* last displayed line in 60 Hz */
1506: && ( nStartHBL == VIDEO_START_HBL_60HZ ) /* screen started in 60 Hz */
1507: && ( ( OverscanMode & OVERSCANMODE_TOP ) == 0 ) /* and top border was not removed : this screen is only 60 Hz */
1508: && ( ShifterFrame.FreqPos50.VBL == nVBLs ) /* switch to 50 Hz during this VBL */
1509: && ( ( ShifterFrame.FreqPos50.HBL < nHBL ) || ( ShifterFrame.FreqPos50.LineCycles <= LineRemoveBottomCycle ) )
1510: && ( ( ShifterFrame.FreqPos60.VBL < nVBLs )
1511: || ( ShifterFrame.FreqPos60.FrameCycles < ShifterFrame.FreqPos50.FrameCycles )
1512: || ( ShifterFrame.FreqPos60.HBL > nHBL )
1513: || ( ( ShifterFrame.FreqPos60.HBL == nHBL ) && ( ShifterFrame.FreqPos60.LineCycles > LineRemoveBottomCycle ) ) ) )
1514: {
1515: LOG_TRACE ( TRACE_VIDEO_BORDER_V , "detect remove bottom 60Hz\n" );
1516: OverscanMode |= OVERSCANMODE_BOTTOM;
1517: nEndHBL = SCANLINES_PER_FRAME_60HZ; /* new end for a 60 Hz screen */
1518: }
1519:
1520: /* Remove bottom border for a 50 Hz screen (tests are similar to the ones for top border) */
1521: else if ( ( nHBL == VIDEO_END_HBL_50HZ-1 ) /* last displayed line in 50 Hz */
1522: && ( ( OverscanMode & OVERSCANMODE_BOTTOM ) == 0 ) /* border was not already removed at line VIDEO_END_HBL_60HZ-1 */
1523: && ( ShifterFrame.FreqPos60.VBL == nVBLs ) /* switch to 60 Hz during this VBL */
1524: && ( ( ShifterFrame.FreqPos60.HBL < nHBL ) || ( ShifterFrame.FreqPos60.LineCycles <= LineRemoveBottomCycle ) )
1525: && ( ( ShifterFrame.FreqPos50.VBL < nVBLs )
1526: || ( ShifterFrame.FreqPos50.FrameCycles < ShifterFrame.FreqPos60.FrameCycles )
1527: || ( ShifterFrame.FreqPos50.HBL > nHBL )
1528: || ( ( ShifterFrame.FreqPos50.HBL == nHBL ) && ( ShifterFrame.FreqPos50.LineCycles > LineRemoveBottomCycle ) ) ) )
1.1.1.13 root 1529: {
1.1.1.15 root 1530: LOG_TRACE ( TRACE_VIDEO_BORDER_V , "detect remove bottom\n" );
1531: OverscanMode |= OVERSCANMODE_BOTTOM;
1532: nEndHBL = VIDEO_END_HBL_50HZ+VIDEO_HEIGHT_BOTTOM_50HZ; /* new end for a 50 Hz screen */
1533: }
1534:
1535:
1536: //
1537: // Check some left/right borders effects that were not detected earlier
1538: // (this is usually due to staying in 60 Hz for too long, which is often a bad
1539: // coding practice as it can distort the display on a real ST)
1540: //
1541:
1542: /* Special case when the line was not started in 60 Hz, then switched to 60 Hz */
1543: /* and was not restored to 50 Hz before the end of the line. In that case, the */
1544: /* line ends 2 bytes earlier on the right (line can start at LINE_START_CYCLE_71/50) */
1545: /* Some programs also turn to 60 Hz too early during the active display of the last */
1546: /* line to remove the bottom border (FNIL by TNT), in that case, we should also remove */
1547: /* 2 bytes to this line */
1548: if ( ( ( ShifterFrame.ShifterLines[ nHBL ].BorderMask & BORDERMASK_RIGHT_MINUS_2 ) == 0 )
1549: && ( ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle != LINE_START_CYCLE_60 ) /* start could be 0 or 56 */
1550: && ( ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle == LINE_END_CYCLE_60 ) )
1551: {
1552: ShifterFrame.ShifterLines[ nHBL ].BorderMask |= BORDERMASK_RIGHT_MINUS_2;
1553: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect late right-2 %d<->%d\n" ,
1554: ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle , ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle );
1555: }
1556:
1557:
1558: /* Similar case when line started in 60 Hz but did not end at the usual LINE_END_CYCLE_60 position */
1559: /* (line can end at LINE_END_CYCLE_71/50 or have right border removed) */
1560: /* This means left border had 2 bytes more to display */
1561: if ( ( ( ShifterFrame.ShifterLines[ nHBL ].BorderMask & BORDERMASK_LEFT_PLUS_2 ) == 0 )
1562: && ( ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle == LINE_START_CYCLE_60 )
1563: && ( ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle != LINE_END_CYCLE_60 ) ) /* end could be 160, 372 or 460 */
1564: {
1565: ShifterFrame.ShifterLines[ nHBL ].BorderMask |= BORDERMASK_LEFT_PLUS_2;
1566: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "detect late left+2 %d<->%d\n" ,
1567: ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle , ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle );
1568: }
1569:
1570:
1571: /* Although a 'left+2' was detected earlier, the freq was switched back to 60 Hz during DE, so the line is just */
1572: /* a normal 60 Hz line ; we must cancel the 'left+2' flag */
1573: else if ( ( ShifterFrame.ShifterLines[ nHBL ].BorderMask & BORDERMASK_LEFT_PLUS_2 )
1574: && ( ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle == LINE_END_CYCLE_60 ) )
1575: {
1576: ShifterFrame.ShifterLines[ nHBL ].BorderMask &= ~BORDERMASK_LEFT_PLUS_2;
1577: LOG_TRACE ( TRACE_VIDEO_BORDER_H , "cancel late left+2 %d<->%d\n" ,
1578: ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle , ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle );
1579: }
1580:
1581:
1.1.1.13 root 1582:
1.1.1.15 root 1583: /* Store palette for very first line on screen - HBLPalettes[0] */
1584: if (nHBL == nFirstVisibleHbl-1)
1585: {
1586: /* Store ALL palette for this line into raster table for datum */
1587: Video_StoreFirstLinePalette();
1588: }
1589:
1590: if (bUseHighRes)
1591: {
1592: /* Copy for hi-res (no overscan) */
1593: if (nHBL >= nFirstVisibleHbl && nHBL < nLastVisibleHbl)
1594: Video_CopyScreenLineMono();
1595: }
1596: /* Are we in possible visible color display (including borders)? */
1597: else if (nHBL >= nFirstVisibleHbl && nHBL < nLastVisibleHbl)
1598: {
1599: /* Store resolution for every line so can check for mix low/med screens */
1600: Video_StoreResolution(nHBL-nFirstVisibleHbl);
1601:
1602: /* Copy line of screen to buffer to simulate TV raster trace
1603: * - required for mouse cursor display/game updates
1604: * Eg, Lemmings and The Killing Game Show are good examples */
1605: Video_CopyScreenLineColor();
1606: }
1607: }
1608:
1609:
1610: /*-----------------------------------------------------------------------*/
1611: /**
1612: * Set default values for the next HBL, depending on the current res/freq.
1613: * We set the number of cycles per line, as well as some default values
1614: * for display start/end cycle.
1615: */
1616: static void Video_StartHBL(void)
1617: {
1618: if ( ( IoMem_ReadByte( 0xff8260 ) & 3 ) == 2 ) /* hi res */
1619: {
1620: nCyclesPerLine = CYCLES_PER_LINE_71HZ;
1621: ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle = LINE_START_CYCLE_71;
1622: ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle = LINE_END_CYCLE_71;
1623: }
1624:
1625: else
1626: {
1627: if ( IoMem_ReadByte ( 0xff820a ) & 2 ) /* 50 Hz */
1628: {
1629: nCyclesPerLine = CYCLES_PER_LINE_50HZ;
1630: if ( ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle == -1 ) /* start not set yet */
1631: ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle = LINE_START_CYCLE_50;
1632: ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle = LINE_END_CYCLE_50;
1633: }
1634: else /* 60 Hz */
1635: {
1636: nCyclesPerLine = CYCLES_PER_LINE_60HZ;
1637: if ( ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle == -1 ) /* start not set yet */
1638: ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle = LINE_START_CYCLE_60;
1639: ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle = LINE_END_CYCLE_60;
1640: }
1641: }
1642: }
1643:
1644:
1645: /*-----------------------------------------------------------------------*/
1646: /**
1647: * End Of Line interrupt
1648: * This interrupt is started on cycle position 404 in 50 Hz and on cycle
1649: * position 400 in 60 Hz. 50 Hz display ends at cycle 376 and 60 Hz displays
1650: * ends at cycle 372. This means the EndLine interrupt happens 28 cycles
1651: * after DisplayEndCycle.
1652: * Note that if bit 3 of MFP AER is 1, then timer B will count start of line
1653: * instead of end of line (at cycle 52+28 or 56+28)
1654: */
1655: void Video_InterruptHandler_EndLine(void)
1656: {
1657: int FrameCycles, HblCounterVideo, LineCycles;
1658: int PendingCycles = -INT_CONVERT_FROM_INTERNAL ( PendingInterruptCount , INT_CPU_CYCLE );
1659:
1660: Video_GetPosition ( &FrameCycles , &HblCounterVideo , &LineCycles );
1661:
1662: LOG_TRACE ( TRACE_VIDEO_HBL , "EndLine TB %d video_cyc=%d line_cyc=%d pending_int_cnt=%d\n" ,
1663: nHBL , FrameCycles , LineCycles , PendingCycles );
1664:
1665: /* Remove this interrupt from list and re-order */
1.1.1.16 root 1666: CycInt_AcknowledgeInterrupt();
1.1.1.15 root 1667:
1668: /* Ignore HBLs in VDI mode */
1669: if (bUseVDIRes)
1670: return;
1671:
1672: /* Generate new Endline, if need to - there are 313 HBLs per frame */
1673: if (nHBL < nScanlinesPerFrame-1)
1674: {
1675: /* By default, next EndLine's int will be on line nHBL+1 at pos 376+28 or 372+28 */
1676: if ( ( IoMem[0xfffa03] & ( 1 << 3 ) ) == 0 ) /* count end of line */
1.1.1.13 root 1677: {
1.1.1.15 root 1678: /* If EndLine int is delayed too much (more than 100 cycles), nLineCycles will */
1679: /* be in the range 0..xxx instead of 400..512. In that case, we need to add */
1680: /* nCyclesPerLine to be in the range 512..x+512 */
1681: /* Maximum possible delay should be around 160 cycles on STF (DIVS) */
1682: /* In that case, HBL int will be delayed too, so we will have HblCounterVideo == nHBL+1 */
1683: if ( HblCounterVideo == nHBL+1 ) /* int happened in fact on the next line nHBL+1 */
1684: LineCycles += nCyclesPerLine;
1.1.1.13 root 1685:
1.1.1.15 root 1686: LineTimerBCycle = Video_TimerB_GetPos( HblCounterVideo );
1.1.1.13 root 1687: }
1688:
1.1.1.15 root 1689: else /* count start of line, no possible delay to handle */
1.1.1.13 root 1690: {
1.1.1.15 root 1691: LineTimerBCycle = Video_TimerB_GetPos( HblCounterVideo );
1.1.1.13 root 1692: }
1693:
1.1.1.15 root 1694: //fprintf ( stderr , "new tb %d %d %d\n" , LineTimerBCycle , nCyclesPerLine , LineTimerBCycle - LineCycles + nCyclesPerLine );
1.1.1.16 root 1695: CycInt_AddRelativeInterrupt ( LineTimerBCycle - LineCycles + nCyclesPerLine,
1.1.1.15 root 1696: INT_CPU_CYCLE, INTERRUPT_VIDEO_ENDLINE );
1.1.1.11 root 1697: }
1698:
1.1.1.15 root 1699: /* Timer B occurs at END of first visible screen line in Event Count mode */
1700: if (nHBL >= nStartHBL && nHBL < nEndHBL)
1.1.1.11 root 1701: {
1.1.1.15 root 1702: /* Handle Timer B when using Event Count mode */
1703: /* We must ensure that the write to fffa1b to activate timer B was */
1704: /* completed before the point where the end of line signal was generated */
1705: /* (in the case of a move.b #8,$fffa1b that would happen 4 cycles */
1706: /* before end of line, the interrupt should not be generated) */
1707: if ( (MFP_TBCR == 0x08) /* Is timer in Event Count mode ? */
1708: && ( ( TimerBEventCountCycleStart == -1 ) /* timer B was started during a previous VBL */
1709: || ( TimerBEventCountCycleStart < FrameCycles-PendingCycles ) ) ) /* timer B was started before this possible interrupt */
1710: MFP_TimerB_EventCount_Interrupt(); /* we have a valid timer B interrupt */
1.1.1.11 root 1711: }
1.1 root 1712: }
1713:
1.1.1.2 root 1714:
1.1.1.15 root 1715:
1716:
1.1.1.2 root 1717: /*-----------------------------------------------------------------------*/
1.1.1.11 root 1718: /**
1719: * Store whole palette on first line so have reference to work from
1720: */
1.1.1.7 root 1721: static void Video_StoreFirstLinePalette(void)
1.1 root 1722: {
1.1.1.11 root 1723: Uint16 *pp2;
1724: int i;
1725:
1726: pp2 = (Uint16 *)&IoMem[0xff8240];
1727: for (i = 0; i < 16; i++)
1728: HBLPalettes[i] = SDL_SwapBE16(*pp2++);
1.1 root 1729:
1.1.1.11 root 1730: /* And set mask flag with palette and resolution */
1731: // FIXME ; enlever PALETTEMASK_RESOLUTION
1732:
1.1.1.15 root 1733: // if ( ShifterFrame.ShifterLines[ nFirstVisibleHbl ].BorderMask == BORDERMASK_NONE ) // no border trick, store the current res
1.1.1.11 root 1734: HBLPaletteMasks[0] = (PALETTEMASK_RESOLUTION|PALETTEMASK_PALETTE) | (((Uint32)IoMem_ReadByte(0xff8260)&0x3)<<16);
1735: // else // border removal, assume low res for the whole line
1736: // HBLPaletteMasks[0] = (PALETTEMASK_RESOLUTION|PALETTEMASK_PALETTE) | (0<<16);
1.1 root 1737: }
1738:
1.1.1.2 root 1739:
1740: /*-----------------------------------------------------------------------*/
1.1.1.11 root 1741: /**
1742: * Store resolution on each line (used to test if mixed low/medium resolutions)
1743: */
1.1.1.7 root 1744: static void Video_StoreResolution(int y)
1.1 root 1745: {
1.1.1.11 root 1746: Uint8 res;
1747: int Mask;
1.1 root 1748:
1.1.1.11 root 1749: /* Clear resolution, and set with current value */
1750: if (!(bUseHighRes || bUseVDIRes))
1751: {
1752: HBLPaletteMasks[y] &= ~(0x3<<16);
1753: res = IoMem_ReadByte(0xff8260)&0x3;
1754:
1.1.1.15 root 1755: Mask = ShifterFrame.ShifterLines[ y+nFirstVisibleHbl ].BorderMask;
1.1.1.11 root 1756:
1.1.1.15 root 1757: if ( Mask & BORDERMASK_OVERSCAN_MED_RES ) /* special case for med res to render the overscan line */
1758: res = 1; /* med res instead of low res */
1.1.1.11 root 1759: else if ( Mask != BORDERMASK_NONE ) /* border removal : assume low res for the whole line */
1760: res = 0;
1.1.1.2 root 1761:
1.1.1.11 root 1762: HBLPaletteMasks[y] |= PALETTEMASK_RESOLUTION|((Uint32)res)<<16;
1763:
1764: #if 0
1765: if ( ( Mask == BORDERMASK_NONE ) /* no border trick, store the current res */
1766: || ( res == 0 ) || ( res == 1 ) ) /* if border trick, ignore passage to hi res */
1767: HBLPaletteMasks[y] |= PALETTEMASK_RESOLUTION|((Uint32)res)<<16;
1768: else /* border removal or hi res : assume low res for the whole line */
1769: HBLPaletteMasks[y] |= (0)<<16;
1770:
1.1.1.15 root 1771: /* special case for med res to render the overscan line */
1772: if ( Mask & BORDERMASK_OVERSCAN_MED_RES )
1773: HBLPaletteMasks[y] |= PALETTEMASK_RESOLUTION|((Uint32)1)<<16; /* med res instead of low res */
1.1.1.11 root 1774: #endif
1.1 root 1775:
1.1.1.11 root 1776: // fprintf ( stderr , "store res %d line %d %x %x\n" , res , y , Mask , HBLPaletteMasks[y] );
1777: }
1.1.1.9 root 1778: }
1779:
1780:
1781: /*-----------------------------------------------------------------------*/
1.1.1.11 root 1782: /**
1783: * Copy one line of monochrome screen into buffer for conversion later.
1784: */
1785: static void Video_CopyScreenLineMono(void)
1786: {
1787: /* Copy one line - 80 bytes in ST high resolution */
1788: memcpy(pSTScreen, pVideoRaster, SCREENBYTES_MONOLINE);
1789: pVideoRaster += SCREENBYTES_MONOLINE;
1790:
1791: /* Handle STE fine scrolling (HWScrollCount is zero on ST). */
1792: if (HWScrollCount)
1793: {
1794: Uint16 *pScrollAdj;
1795: int nNegScrollCnt;
1796:
1797: pScrollAdj = (Uint16 *)pSTScreen;
1798: nNegScrollCnt = 16 - HWScrollCount;
1799:
1800: /* Shift the whole line by the given scroll count */
1801: while ((Uint8*)pScrollAdj < pSTScreen + SCREENBYTES_MONOLINE-2)
1802: {
1803: do_put_mem_word(pScrollAdj, (do_get_mem_word(pScrollAdj) << HWScrollCount)
1804: | (do_get_mem_word(pScrollAdj+1) >> nNegScrollCnt));
1805: ++pScrollAdj;
1806: }
1807:
1808: /* Handle the last 16 pixels of the line */
1809: do_put_mem_word(pScrollAdj, (do_get_mem_word(pScrollAdj) << HWScrollCount)
1810: | (do_get_mem_word(pVideoRaster) >> nNegScrollCnt));
1811:
1812: /* HW scrolling advances Shifter video counter by one */
1813: pVideoRaster += 1 * 2;
1814: }
1815:
1816: /* LineWidth is zero on ST. */
1817: /* On STE, the Shifter skips the given amount of words. */
1818: pVideoRaster += LineWidth*2;
1819:
1820: /* On STE, handle modifications of the video counter address $ff8205/07/09 */
1821: /* that occurred while the display was already ON */
1.1.1.16 root 1822: if ( VideoCounterDelayedOffset != 0 )
1.1.1.11 root 1823: {
1.1.1.16 root 1824: pVideoRaster += ( VideoCounterDelayedOffset & ~1 );
1825: VideoCounterDelayedOffset = 0;
1.1.1.11 root 1826: }
1.1.1.16 root 1827:
1828: if ( pVideoRasterDelayed != NULL )
1.1.1.11 root 1829: {
1.1.1.16 root 1830: pVideoRaster = pVideoRasterDelayed;
1831: pVideoRasterDelayed = NULL;
1.1.1.11 root 1832: }
1833:
1834: /* On STE, if we wrote to the hwscroll register, we set the */
1835: /* new value here, once the current line was processed */
1836: if ( NewHWScrollCount >= 0 )
1837: {
1838: HWScrollCount = NewHWScrollCount;
1839: NewHWScrollCount = -1;
1840: }
1841:
1842: /* On STE, if we wrote to the linewidth register, we set the */
1843: /* new value here, once the current line was processed */
1844: if ( NewLineWidth >= 0 )
1845: {
1846: LineWidth = NewLineWidth;
1847: NewLineWidth = -1;
1848: }
1849:
1850: /* Each screen line copied to buffer is always same length */
1851: pSTScreen += SCREENBYTES_MONOLINE;
1852: }
1853:
1854:
1855: /*-----------------------------------------------------------------------*/
1856: /**
1857: * Copy one line of color screen into buffer for conversion later.
1858: * Possible lines may be top/bottom border, and/or left/right borders.
1859: */
1.1.1.9 root 1860: static void Video_CopyScreenLineColor(void)
1861: {
1.1.1.15 root 1862: int LineBorderMask;
1.1.1.11 root 1863: int VideoOffset = 0;
1864: int STF_PixelScroll = 0;
1.1.1.14 root 1865: int LineRes;
1.1.1.17! root 1866: Uint8 *pVideoRasterEndLine; /* addr of the last byte copied from pVideoRaster to pSTScreen (for HWScrollCount) */
! 1867: int i;
1.1.1.14 root 1868:
1.1.1.15 root 1869: LineBorderMask = ShifterFrame.ShifterLines[ nHBL ].BorderMask;
1.1.1.16 root 1870: STF_PixelScroll = ShifterFrame.ShifterLines[ nHBL ].DisplayPixelShift;
1.1.1.15 root 1871:
1872: /* Get resolution for this line (in case of mixed low/med screen) */
1873: LineRes = ( HBLPaletteMasks[nHBL-nFirstVisibleHbl] >> 16 ) & 1; /* 0=low res 1=med res */
1.1.1.11 root 1874:
1.1.1.16 root 1875: //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 1876:
1877: /* If left border is opened, we need to compensate one missing word in low res (1 plan) */
1.1.1.15 root 1878: /* If overscan is in med res, the offset is variable */
1879: if ( LineBorderMask & BORDERMASK_OVERSCAN_MED_RES )
1880: VideoOffset = - ( ( LineBorderMask >> 20 ) & 0x0f ); /* No Cooper=0 PYM=-2 in med res overscan */
1.1.1.11 root 1881:
1882: else if ( LineBorderMask & BORDERMASK_LEFT_OFF )
1.1.1.14 root 1883: VideoOffset = -2; /* always 2 bytes in low res overscan */
1.1.1.11 root 1884:
1.1.1.16 root 1885: else if ( LineBorderMask & BORDERMASK_LEFT_OFF_2_STE )
1886: VideoOffset = -4; /* 4 first bytes of the line are not shown */
1887:
1.1.1.11 root 1888: /* Handle 4 pixels hardware scrolling ('ST Cnx' demo in 'Punish Your Machine') */
1889: /* Depending on the number of pixels, we need to compensate for some skipped words */
1.1.1.15 root 1890: else if ( LineBorderMask & BORDERMASK_LEFT_OFF_MED )
1.1.1.11 root 1891: {
1.1.1.16 root 1892: if ( STF_PixelScroll == 13 ) VideoOffset = 2;
1893: else if ( STF_PixelScroll == 9 ) VideoOffset = 0;
1894: else if ( STF_PixelScroll == 5 ) VideoOffset = -2;
1895: else if ( STF_PixelScroll == 1 ) VideoOffset = -4;
1.1.1.11 root 1896: else VideoOffset = 0; /* never used ? */
1897:
1.1.1.16 root 1898: STF_PixelScroll -= 8; /* removing left border in mid res also shifts display to the left */
1.1.1.11 root 1899: // fprintf(stderr , "scr off %d %d\n" , STF_PixelScroll , VideoOffset);
1900: }
1901:
1.1.1.13 root 1902:
1.1.1.11 root 1903: /* Is total blank line? I.e. top/bottom border? */
1904: if ((nHBL < nStartHBL) || (nHBL >= nEndHBL)
1.1.1.15 root 1905: || (LineBorderMask & BORDERMASK_EMPTY_LINE))
1.1.1.11 root 1906: {
1907: /* Clear line to color '0' */
1908: memset(pSTScreen, 0, SCREENBYTES_LINE);
1909: }
1910: else
1911: {
1.1.1.16 root 1912: /* Does have left bordder ? */
1913: if ( LineBorderMask & ( BORDERMASK_LEFT_OFF | BORDERMASK_LEFT_OFF_MED ) ) /* bigger line by 26 bytes on the left */
1.1.1.11 root 1914: {
1915: pVideoRaster += BORDERBYTES_LEFT-SCREENBYTES_LEFT+VideoOffset;
1916: memcpy(pSTScreen, pVideoRaster, SCREENBYTES_LEFT);
1917: pVideoRaster += SCREENBYTES_LEFT;
1918: }
1.1.1.16 root 1919: else if ( LineBorderMask & BORDERMASK_LEFT_OFF_2_STE ) /* bigger line by 20 bytes on the left (STE specific) */
1920: { /* bytes 0-3 are not shown, only next 16 bytes (32 pixels, 4 bitplanes) */
1921: if ( SCREENBYTES_LEFT > BORDERBYTES_LEFT_2_STE )
1922: {
1923: memset ( pSTScreen, 0, SCREENBYTES_LEFT-BORDERBYTES_LEFT_2_STE+4 ); /* clear unused pixels + bytes 0-3 */
1924: memcpy ( pSTScreen+SCREENBYTES_LEFT-BORDERBYTES_LEFT_2_STE+4, pVideoRaster+VideoOffset+4, BORDERBYTES_LEFT_2_STE-4 );
1925: }
1926: else
1927: memcpy ( pSTScreen, pVideoRaster+BORDERBYTES_LEFT_2_STE-SCREENBYTES_LEFT+VideoOffset, SCREENBYTES_LEFT );
1928:
1929: pVideoRaster += BORDERBYTES_LEFT_2_STE+VideoOffset;
1930: }
1931: else if (LineBorderMask & BORDERMASK_LEFT_PLUS_2) /* bigger line by 2 bytes on the left */
1.1.1.11 root 1932: {
1.1.1.16 root 1933: if ( SCREENBYTES_LEFT > 2 )
1934: {
1935: memset(pSTScreen,0,SCREENBYTES_LEFT-2); /* clear unused pixels */
1936: memcpy(pSTScreen+SCREENBYTES_LEFT-2, pVideoRaster, 2);
1937: }
1938: else
1939: { /* nothing to copy, left border is not large enough */
1940: }
1941:
1.1.1.11 root 1942: pVideoRaster += 2;
1943: }
1.1.1.16 root 1944: else if (bSteBorderFlag) /* bigger line by 8 bytes on the left (STE specific) */
1.1.1.12 root 1945: {
1.1.1.16 root 1946: if ( SCREENBYTES_LEFT > 4*2 )
1947: {
1948: memset(pSTScreen,0,SCREENBYTES_LEFT-4*2); /* clear unused pixels */
1949: memcpy(pSTScreen+SCREENBYTES_LEFT-4*2, pVideoRaster, 4*2);
1950: }
1951: else
1952: { /* nothing to copy, left border is not large enough */
1953: }
1954:
1.1.1.12 root 1955: pVideoRaster += 4*2;
1956: }
1.1.1.11 root 1957: else
1.1.1.16 root 1958: memset(pSTScreen,0,SCREENBYTES_LEFT); /* left border not removed, clear to color '0' */
1.1.1.11 root 1959:
1960: /* Short line due to hires in the middle ? */
1961: if (LineBorderMask & BORDERMASK_STOP_MIDDLE)
1962: {
1963: /* 106 bytes less in the line */
1964: memcpy(pSTScreen+SCREENBYTES_LEFT, pVideoRaster, SCREENBYTES_MIDDLE-106);
1.1.1.12 root 1965: memset(pSTScreen+SCREENBYTES_LEFT+SCREENBYTES_MIDDLE-106, 0, 106); /* clear unused pixels */
1.1.1.11 root 1966: pVideoRaster += (SCREENBYTES_MIDDLE-106);
1967: }
1968: else
1969: {
1970: /* normal middle part (160 bytes) */
1971: memcpy(pSTScreen+SCREENBYTES_LEFT, pVideoRaster, SCREENBYTES_MIDDLE);
1972: pVideoRaster += SCREENBYTES_MIDDLE;
1973: }
1974:
1975: /* Does have right border ? */
1976: if (LineBorderMask & BORDERMASK_RIGHT_OFF)
1977: {
1978: memcpy(pSTScreen+SCREENBYTES_LEFT+SCREENBYTES_MIDDLE, pVideoRaster, SCREENBYTES_RIGHT);
1.1.1.17! root 1979: pVideoRasterEndLine = pVideoRaster + SCREENBYTES_RIGHT;
1.1.1.16 root 1980: pVideoRaster += BORDERBYTES_RIGHT;
1.1.1.11 root 1981: }
1982: else if (LineBorderMask & BORDERMASK_RIGHT_MINUS_2)
1983: {
1984: /* Shortened line by 2 bytes */
1985: memset(pSTScreen+SCREENBYTES_LEFT+SCREENBYTES_MIDDLE-2, 0, SCREENBYTES_RIGHT+2);
1986: pVideoRaster -= 2;
1.1.1.17! root 1987: pVideoRasterEndLine = pVideoRaster;
1.1.1.11 root 1988: }
1989: else
1990: {
1991: /* Simply clear right border to '0' */
1992: memset(pSTScreen+SCREENBYTES_LEFT+SCREENBYTES_MIDDLE,0,SCREENBYTES_RIGHT);
1.1.1.17! root 1993: pVideoRasterEndLine = pVideoRaster;
1.1.1.11 root 1994: }
1995:
1996: /* Full right border removal up to the end of the line (cycle 512) */
1997: if (LineBorderMask & BORDERMASK_RIGHT_OFF_FULL)
1998: pVideoRaster += BORDERBYTES_RIGHT_FULL;
1999:
1.1.1.17! root 2000:
1.1.1.11 root 2001: /* Correct the offset for pVideoRaster from BORDERMASK_LEFT_OFF above if needed */
2002: pVideoRaster -= VideoOffset; /* VideoOffset is 0 or -2 */
2003:
2004:
2005: /* STE specific */
1.1.1.13 root 2006: if (!bSteBorderFlag && HWScrollCount) /* Handle STE fine scrolling (HWScrollCount is zero on ST) */
1.1.1.11 root 2007: {
1.1.1.13 root 2008: Uint16 *pScrollAdj; /* Pointer to actual position in line */
1.1.1.11 root 2009: int nNegScrollCnt;
1.1.1.13 root 2010: Uint16 *pScrollEndAddr; /* Pointer to end of the line */
1.1.1.11 root 2011:
2012: nNegScrollCnt = 16 - HWScrollCount;
2013: if (LineBorderMask & BORDERMASK_LEFT_OFF)
2014: pScrollAdj = (Uint16 *)pSTScreen;
1.1.1.16 root 2015: else if (LineBorderMask & BORDERMASK_LEFT_OFF_2_STE)
2016: {
2017: if ( SCREENBYTES_LEFT > BORDERBYTES_LEFT_2_STE )
1.1.1.17! root 2018: pScrollAdj = (Uint16 *)(pSTScreen+8); /* don't scroll the 8 first bytes (keep color 0)*/
1.1.1.16 root 2019: else
2020: pScrollAdj = (Uint16 *)pSTScreen; /* we render less bytes on screen than a real ST, scroll the whole line */
2021: }
1.1.1.11 root 2022: else
2023: pScrollAdj = (Uint16 *)(pSTScreen + SCREENBYTES_LEFT);
1.1.1.16 root 2024:
1.1.1.17! root 2025: /* When shifting the line to the left, we will have 'HWScrollCount' missing pixels at */
! 2026: /* the end of the line. We must complete these last 16 pixels with pixels from the */
! 2027: /* video counter last accessed value in pVideoRasterEndLine. */
! 2028: /* There're 2 passes : */
! 2029: /* - shift whole line except the last 16 pixels */
! 2030: /* - shift/complete the last 16 pixels */
! 2031:
! 2032: /* Addr of the last byte to shift in the 1st pass (excluding the last 16 pixels of the line) */
1.1.1.11 root 2033: if (LineBorderMask & BORDERMASK_RIGHT_OFF)
2034: pScrollEndAddr = (Uint16 *)(pSTScreen + SCREENBYTES_LINE - 8);
2035: else
2036: pScrollEndAddr = (Uint16 *)(pSTScreen + SCREENBYTES_LEFT + SCREENBYTES_MIDDLE - 8);
2037:
1.1.1.17! root 2038:
! 2039: if ( LineRes == 1 ) /* med res */
1.1.1.11 root 2040: {
1.1.1.15 root 2041: /* 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 2042: pScrollEndAddr += 2; /* 2 Uint16 = 4 bytes = 16 pixels */
1.1.1.14 root 2043:
1.1.1.17! root 2044: /* Shift the whole line to the left by the given scroll count (except the last 16 pixels) */
1.1.1.14 root 2045: while (pScrollAdj < pScrollEndAddr)
2046: {
2047: do_put_mem_word(pScrollAdj, (do_get_mem_word(pScrollAdj) << HWScrollCount)
2048: | (do_get_mem_word(pScrollAdj+2) >> nNegScrollCnt));
2049: ++pScrollAdj;
2050: }
1.1.1.17! root 2051: /* Handle the last 16 pixels of the line (complete the line with pixels from pVideoRasterEndLine) */
! 2052: for ( i=0 ; i<2 ; i++ )
! 2053: do_put_mem_word(pScrollAdj+i, (do_get_mem_word(pScrollAdj+i) << HWScrollCount)
! 2054: | (do_get_mem_word(pVideoRasterEndLine+i*2) >> nNegScrollCnt));
1.1.1.14 root 2055:
2056: /* Depending on whether $ff8264 or $ff8265 was used to scroll, */
2057: /* we prefetched 16 pixel (4 bytes) */
1.1.1.13 root 2058: if ( HWScrollPrefetch == 1 ) /* $ff8265 prefetches 16 pixels */
2059: pVideoRaster += 2 * 2; /* 2 bitplans */
1.1.1.14 root 2060:
2061: /* If scrolling with $ff8264, there's no prefetch, which means display starts */
2062: /* 16 pixels later but still stops at the normal point (eg we display */
2063: /* (320-16) pixels in low res). We shift the whole line 4 bytes to the right to */
2064: /* get the correct result (using memmove, as src/dest are overlapping). */
2065: else
2066: {
2067: if (LineBorderMask & BORDERMASK_RIGHT_OFF)
2068: memmove ( pSTScreen+4 , pSTScreen , SCREENBYTES_LINE - 4 );
2069: else
2070: memmove ( pSTScreen+4 , pSTScreen , SCREENBYTES_LEFT + SCREENBYTES_MIDDLE - 4 );
2071:
2072: memset ( pSTScreen , 0 , 4 ); /* first 16 pixels are color '0' */
2073: }
1.1.1.11 root 2074: }
1.1.1.14 root 2075:
1.1.1.17! root 2076: else /* low res */
1.1.1.11 root 2077: {
1.1.1.17! root 2078: /* Shift the whole line to the left by the given scroll count (except the last 16 pixels) */
1.1.1.11 root 2079: while (pScrollAdj < pScrollEndAddr)
2080: {
2081: do_put_mem_word(pScrollAdj, (do_get_mem_word(pScrollAdj) << HWScrollCount)
2082: | (do_get_mem_word(pScrollAdj+4) >> nNegScrollCnt));
2083: ++pScrollAdj;
2084: }
1.1.1.17! root 2085: /* Handle the last 16 pixels of the line (complete the line with pixels from pVideoRasterEndLine) */
! 2086: for ( i=0 ; i<4 ; i++ )
! 2087: do_put_mem_word(pScrollAdj+i, (do_get_mem_word(pScrollAdj+i) << HWScrollCount)
! 2088: | (do_get_mem_word(pVideoRasterEndLine+i*2) >> nNegScrollCnt));
1.1.1.13 root 2089:
2090: /* Depending on whether $ff8264 or $ff8265 was used to scroll, */
2091: /* we prefetched 16 pixel (8 bytes) */
2092: if ( HWScrollPrefetch == 1 ) /* $ff8265 prefetches 16 pixels */
2093: pVideoRaster += 4 * 2; /* 4 bitplans */
2094:
2095: /* If scrolling with $ff8264, there's no prefetch, which means display starts */
2096: /* 16 pixels later but still stops at the normal point (eg we display */
2097: /* (320-16) pixels in low res). We shift the whole line 8 bytes to the right to */
2098: /* get the correct result (using memmove, as src/dest are overlapping). */
2099: else
2100: {
2101: if (LineBorderMask & BORDERMASK_RIGHT_OFF)
2102: memmove ( pSTScreen+8 , pSTScreen , SCREENBYTES_LINE - 8 );
2103: else
2104: memmove ( pSTScreen+8 , pSTScreen , SCREENBYTES_LEFT + SCREENBYTES_MIDDLE - 8 );
2105:
2106: memset ( pSTScreen , 0 , 8 ); /* first 16 pixels are color '0' */
2107: }
1.1.1.11 root 2108:
2109: /* On STE, when we have a 230 bytes overscan line and HWScrollCount > 0 */
1.1.1.17! root 2110: /* we must read 6 bytes less than expected if scrolling is using prefetching ($ff8265) */
! 2111: /* (this is not the case for the 224 bytes overscan which is a multiple of 8) */
1.1.1.11 root 2112: if ( (LineBorderMask & BORDERMASK_LEFT_OFF) && (LineBorderMask & BORDERMASK_RIGHT_OFF) )
1.1.1.17! root 2113: {
! 2114: if ( HWScrollPrefetch == 1 )
! 2115: pVideoRaster -= 6; /* we don't add 8 bytes (see above), but 2 */
! 2116: else
! 2117: pVideoRaster -= 0;
! 2118: }
1.1.1.11 root 2119:
2120: }
2121: }
2122:
2123: /* LineWidth is zero on ST. */
2124: /* On STE, the Shifter skips the given amount of words. */
2125: pVideoRaster += LineWidth*2;
2126:
2127: /* On STE, handle modifications of the video counter address $ff8205/07/09 */
2128: /* that occurred while the display was already ON */
1.1.1.16 root 2129: if ( VideoCounterDelayedOffset != 0 )
1.1.1.11 root 2130: {
1.1.1.16 root 2131: pVideoRaster += ( VideoCounterDelayedOffset & ~1 );
2132: // fprintf ( stderr , "adjust video counter offset=%d new video=%x\n" , VideoCounterDelayedOffset , pVideoRaster-STRam );
2133: VideoCounterDelayedOffset = 0;
1.1.1.11 root 2134: }
1.1.1.16 root 2135:
2136: if ( pVideoRasterDelayed != NULL )
1.1.1.11 root 2137: {
1.1.1.16 root 2138: pVideoRaster = pVideoRasterDelayed;
2139: // fprintf ( stderr , "adjust video counter const new video=%x\n" , pVideoRaster-STRam );
2140: pVideoRasterDelayed = NULL;
1.1.1.11 root 2141: }
2142:
2143: /* On STE, if we wrote to the hwscroll register, we set the */
2144: /* new value here, once the current line was processed */
2145: if ( NewHWScrollCount >= 0 )
2146: {
2147: HWScrollCount = NewHWScrollCount;
1.1.1.13 root 2148: HWScrollPrefetch = NewHWScrollPrefetch;
1.1.1.11 root 2149: NewHWScrollCount = -1;
1.1.1.13 root 2150: NewHWScrollPrefetch = -1;
2151: }
2152:
2153: /* On STE, if we trigger the left border + 16 pixels trick, we set the */
2154: /* new value here, once the current line was processed */
2155: if ( NewSteBorderFlag >= 0 )
2156: {
2157: if ( NewSteBorderFlag == 0 )
1.1.1.15 root 2158: bSteBorderFlag = false;
1.1.1.13 root 2159: else
1.1.1.15 root 2160: bSteBorderFlag = true;
1.1.1.13 root 2161: NewSteBorderFlag = -1;
1.1.1.11 root 2162: }
2163:
2164: /* On STE, if we wrote to the linewidth register, we set the */
2165: /* new value here, once the current line was processed */
2166: if ( NewLineWidth >= 0 )
2167: {
2168: LineWidth = NewLineWidth;
2169: NewLineWidth = -1;
2170: }
1.1.1.16 root 2171:
2172:
2173: /* Handle 4 pixels hardware scrolling ('ST Cnx' demo in 'Punish Your Machine') */
2174: /* as well as scrolling occuring when removing the left border. */
2175: /* If >0, shift the line by STF_PixelScroll pixels to the right */
2176: /* If <0, shift the line by -STF_PixelScroll pixels to the left */
2177: /* This should be handled after the STE's hardware scrolling as it will scroll */
2178: /* the whole displayed area (while the STE scrolls pixels inside the displayed area) */
2179: if ( STF_PixelScroll > 0 )
2180: {
2181: Uint16 *pScreenLineEnd;
2182: int count;
2183:
2184: pScreenLineEnd = (Uint16 *) ( pSTScreen + SCREENBYTES_LINE - 2 );
1.1.1.17! root 2185: if ( LineRes == 0 ) /* low res */
! 2186: {
! 2187: for ( count = 0 ; count < ( SCREENBYTES_LINE - 8 ) / 2 ; count++ , pScreenLineEnd-- )
! 2188: do_put_mem_word ( pScreenLineEnd , ( ( do_get_mem_word ( pScreenLineEnd - 4 ) << 16 ) | ( do_get_mem_word ( pScreenLineEnd ) ) ) >> STF_PixelScroll );
! 2189: /* Handle the first 16 pixels of the line (add color 0 pixels to the extreme left) */
! 2190: do_put_mem_word ( pScreenLineEnd-0 , ( do_get_mem_word ( pScreenLineEnd-0 ) >> STF_PixelScroll ) );
! 2191: do_put_mem_word ( pScreenLineEnd-1 , ( do_get_mem_word ( pScreenLineEnd-1 ) >> STF_PixelScroll ) );
! 2192: do_put_mem_word ( pScreenLineEnd-2 , ( do_get_mem_word ( pScreenLineEnd-2 ) >> STF_PixelScroll ) );
! 2193: do_put_mem_word ( pScreenLineEnd-3 , ( do_get_mem_word ( pScreenLineEnd-3 ) >> STF_PixelScroll ) );
! 2194: }
! 2195: else /* med res */
! 2196: {
! 2197: for ( count = 0 ; count < ( SCREENBYTES_LINE - 4 ) / 2 ; count++ , pScreenLineEnd-- )
! 2198: do_put_mem_word ( pScreenLineEnd , ( ( do_get_mem_word ( pScreenLineEnd - 2 ) << 16 ) | ( do_get_mem_word ( pScreenLineEnd ) ) ) >> STF_PixelScroll );
! 2199: /* Handle the first 16 pixels of the line (add color 0 pixels to the extreme left) */
! 2200: do_put_mem_word ( pScreenLineEnd-0 , ( do_get_mem_word ( pScreenLineEnd-0 ) >> STF_PixelScroll ) );
! 2201: do_put_mem_word ( pScreenLineEnd-1 , ( do_get_mem_word ( pScreenLineEnd-1 ) >> STF_PixelScroll ) );
! 2202: }
1.1.1.16 root 2203: }
2204: else if ( STF_PixelScroll < 0 )
2205: {
2206: Uint16 *pScreenLineStart;
2207: int count;
2208:
2209: STF_PixelScroll = -STF_PixelScroll;
2210: pScreenLineStart = (Uint16 *)pSTScreen;
1.1.1.17! root 2211: if ( LineRes == 0 ) /* low res */
! 2212: {
! 2213: for ( count = 0 ; count < ( SCREENBYTES_LINE - 8 ) / 2 ; count++ , pScreenLineStart++ )
! 2214: do_put_mem_word ( pScreenLineStart , ( ( do_get_mem_word ( pScreenLineStart ) << STF_PixelScroll ) | ( do_get_mem_word ( pScreenLineStart + 4 ) >> (16-STF_PixelScroll) ) ) );
! 2215: /* Handle the last 16 pixels of the line (add color 0 pixels to the extreme right) */
! 2216: do_put_mem_word ( pScreenLineStart+0 , ( do_get_mem_word ( pScreenLineStart+0 ) << STF_PixelScroll ) );
! 2217: do_put_mem_word ( pScreenLineStart+1 , ( do_get_mem_word ( pScreenLineStart+1 ) << STF_PixelScroll ) );
! 2218: do_put_mem_word ( pScreenLineStart+2 , ( do_get_mem_word ( pScreenLineStart+2 ) << STF_PixelScroll ) );
! 2219: do_put_mem_word ( pScreenLineStart+3 , ( do_get_mem_word ( pScreenLineStart+3 ) << STF_PixelScroll ) );
! 2220: }
! 2221: else /* med res */
! 2222: {
! 2223: for ( count = 0 ; count < ( SCREENBYTES_LINE - 4 ) / 2 ; count++ , pScreenLineStart++ )
! 2224: do_put_mem_word ( pScreenLineStart , ( ( do_get_mem_word ( pScreenLineStart ) << STF_PixelScroll ) | ( do_get_mem_word ( pScreenLineStart + 2 ) >> (16-STF_PixelScroll) ) ) );
! 2225: /* Handle the last 16 pixels of the line (add color 0 pixels to the extreme right) */
! 2226: do_put_mem_word ( pScreenLineStart+0 , ( do_get_mem_word ( pScreenLineStart+0 ) << STF_PixelScroll ) );
! 2227: do_put_mem_word ( pScreenLineStart+1 , ( do_get_mem_word ( pScreenLineStart+1 ) << STF_PixelScroll ) );
! 2228: }
1.1.1.16 root 2229: }
1.1.1.11 root 2230: }
2231:
2232: /* Each screen line copied to buffer is always same length */
2233: pSTScreen += SCREENBYTES_LINE;
2234: }
2235:
2236:
2237: /*-----------------------------------------------------------------------*/
2238: /**
2239: * Copy extended GEM resolution screen
2240: */
1.1.1.9 root 2241: static void Video_CopyVDIScreen(void)
1.1 root 2242: {
1.1.1.11 root 2243: /* Copy whole screen, don't care about being exact as for GEM only */
2244: memcpy(pSTScreen, pVideoRaster, ((VDIWidth*VDIPlanes)/8)*VDIHeight);
1.1 root 2245: }
2246:
1.1.1.2 root 2247:
2248: /*-----------------------------------------------------------------------*/
1.1.1.11 root 2249: /**
2250: * Clear raster line table to store changes in palette/resolution on a line
2251: * basic. Called once on VBL interrupt.
2252: */
1.1 root 2253: void Video_SetScreenRasters(void)
2254: {
1.1.1.11 root 2255: pHBLPaletteMasks = HBLPaletteMasks;
2256: pHBLPalettes = HBLPalettes;
2257: memset(pHBLPaletteMasks, 0, sizeof(Uint32)*NUM_VISIBLE_LINES); /* Clear array */
1.1 root 2258: }
2259:
1.1.1.2 root 2260:
2261: /*-----------------------------------------------------------------------*/
1.1.1.11 root 2262: /**
2263: * Set pointers to HBLPalette tables to store correct colours/resolutions
2264: */
1.1.1.9 root 2265: static void Video_SetHBLPaletteMaskPointers(void)
1.1 root 2266: {
1.1.1.15 root 2267: int FrameCycles, HblCounterVideo, LineCycles;
1.1.1.11 root 2268: int Line;
2269:
2270: /* FIXME [NP] We should use Cycles_GetCounterOnWriteAccess, but it wouldn't */
2271: /* work when using multiple accesses instructions like move.l or movem */
1.1.1.15 root 2272: /* To correct this, we assume a delay of 8 cycles (should give a good approximation */
1.1.1.11 root 2273: /* of a move.w or movem.l for example) */
2274: // FrameCycles = Cycles_GetCounterOnWriteAccess(CYCLES_COUNTER_VIDEO);
2275: FrameCycles = Cycles_GetCounter(CYCLES_COUNTER_VIDEO) + 8;
2276:
2277: /* Find 'line' into palette - screen starts 63 lines down, less 29 for top overscan */
1.1.1.15 root 2278: Video_ConvertPosition ( FrameCycles , &HblCounterVideo , &LineCycles );
2279: Line = HblCounterVideo - nFirstVisibleHbl;
1.1.1.11 root 2280:
2281: /* FIXME [NP] if the color change occurs after the last visible pixel of a line */
2282: /* we consider the palette should be modified on the next line. This is quite */
2283: /* a hack, we should handle all color changes through spec512.c to have cycle */
2284: /* accuracy all the time. */
1.1.1.15 root 2285: if ( LineCycles >= LINE_END_CYCLE_NO_RIGHT )
2286: Line++;
1.1.1.11 root 2287:
2288: if (Line < 0) /* Limit to top/bottom of possible visible screen */
2289: Line = 0;
2290: if (Line >= NUM_VISIBLE_LINES)
2291: Line = NUM_VISIBLE_LINES-1;
2292:
2293: /* Store pointers */
2294: pHBLPaletteMasks = &HBLPaletteMasks[Line]; /* Next mask entry */
2295: pHBLPalettes = &HBLPalettes[16*Line]; /* Next colour raster list x16 colours */
1.1 root 2296: }
1.1.1.8 root 2297:
2298:
1.1.1.9 root 2299: /*-----------------------------------------------------------------------*/
1.1.1.11 root 2300: /**
2301: * Set video shifter timing variables according to screen refresh rate.
2302: * Note: The following equation must be satisfied for correct timings:
2303: *
2304: * nCyclesPerLine * nScanlinesPerFrame * nScreenRefreshRate = 8 MHz
2305: */
1.1.1.10 root 2306: static void Video_ResetShifterTimings(void)
2307: {
1.1.1.11 root 2308: Uint8 nSyncByte;
1.1.1.10 root 2309:
1.1.1.11 root 2310: nSyncByte = IoMem_ReadByte(0xff820a);
1.1.1.10 root 2311:
1.1.1.11 root 2312: if (bUseHighRes)
2313: {
2314: /* 71 Hz, monochrome */
2315: nScreenRefreshRate = 71;
2316: nScanlinesPerFrame = SCANLINES_PER_FRAME_71HZ;
2317: nCyclesPerLine = CYCLES_PER_LINE_71HZ;
1.1.1.13 root 2318: nStartHBL = VIDEO_START_HBL_71HZ;
1.1.1.11 root 2319: nFirstVisibleHbl = FIRST_VISIBLE_HBL_71HZ;
1.1.1.13 root 2320: nLastVisibleHbl = FIRST_VISIBLE_HBL_71HZ + VIDEO_HEIGHT_HBL_MONO;
1.1.1.11 root 2321: }
2322: else if (nSyncByte & 2) /* Check if running in 50 Hz or in 60 Hz */
2323: {
2324: /* 50 Hz */
2325: nScreenRefreshRate = 50;
2326: nScanlinesPerFrame = SCANLINES_PER_FRAME_50HZ;
2327: nCyclesPerLine = CYCLES_PER_LINE_50HZ;
1.1.1.13 root 2328: nStartHBL = VIDEO_START_HBL_50HZ;
1.1.1.11 root 2329: nFirstVisibleHbl = FIRST_VISIBLE_HBL_50HZ;
1.1.1.13 root 2330: nLastVisibleHbl = FIRST_VISIBLE_HBL_50HZ + NUM_VISIBLE_LINES;
1.1.1.11 root 2331: }
2332: else
2333: {
2334: /* 60 Hz */
2335: nScreenRefreshRate = 60;
2336: nScanlinesPerFrame = SCANLINES_PER_FRAME_60HZ;
2337: nCyclesPerLine = CYCLES_PER_LINE_60HZ;
1.1.1.13 root 2338: nStartHBL = VIDEO_START_HBL_60HZ;
1.1.1.11 root 2339: nFirstVisibleHbl = FIRST_VISIBLE_HBL_60HZ;
1.1.1.13 root 2340: nLastVisibleHbl = FIRST_VISIBLE_HBL_60HZ + NUM_VISIBLE_LINES;
1.1.1.11 root 2341: }
2342:
2343: if (bUseHighRes)
2344: {
1.1.1.13 root 2345: nEndHBL = nStartHBL + VIDEO_HEIGHT_HBL_MONO;
1.1.1.11 root 2346: }
2347: else
2348: {
1.1.1.13 root 2349: nEndHBL = nStartHBL + VIDEO_HEIGHT_HBL_COLOR;
1.1.1.11 root 2350: }
2351:
2352: /* Reset freq changes position for the next VBL to come */
1.1.1.13 root 2353: LastCycleScroll8264 = -1;
2354: LastCycleScroll8265 = -1;
1.1.1.15 root 2355:
2356: TimerBEventCountCycleStart = -1; /* reset timer B activation cycle for this VBL */
2357:
2358: LastCycleHblException = -1;
1.1.1.11 root 2359: }
1.1.1.10 root 2360:
2361:
1.1.1.11 root 2362: /*-----------------------------------------------------------------------*/
2363: /**
1.1.1.15 root 2364: * Clear the array indicating the state of each video line.
1.1.1.11 root 2365: */
1.1.1.15 root 2366: static void Video_InitShifterLines ( void )
1.1.1.11 root 2367: {
1.1.1.15 root 2368: int i;
2369:
2370: for ( i=0 ; i<MAX_SCANLINES_PER_FRAME ; i++ )
2371: {
2372: ShifterFrame.ShifterLines[i].BorderMask = 0;
2373: ShifterFrame.ShifterLines[i].DisplayPixelShift = 0;
2374: ShifterFrame.ShifterLines[i].DisplayStartCycle = -1;
2375: }
2376:
2377: ShifterFrame.ShifterLines[0].StartCycle = 0; /* 1st HBL starts at cycle 0 */
1.1.1.10 root 2378: }
2379:
2380:
2381: /*-----------------------------------------------------------------------*/
1.1.1.11 root 2382: /**
2383: * Called on VBL, set registers ready for frame
2384: */
1.1.1.9 root 2385: static void Video_ClearOnVBL(void)
2386: {
1.1.1.11 root 2387: /* New screen, so first HBL */
2388: nHBL = 0;
2389: OverscanMode = OVERSCANMODE_NONE;
2390:
2391: Video_ResetShifterTimings();
2392:
2393: /* Get screen address pointer, aligned to 256 bytes on ST (ie ignore lowest byte) */
2394: VideoBase = (Uint32)IoMem_ReadByte(0xff8201)<<16 | (Uint32)IoMem_ReadByte(0xff8203)<<8;
2395: if (ConfigureParams.System.nMachineType != MACHINE_ST)
2396: {
2397: /* on STe 2 aligned, on Falcon 4 aligned, on TT 8 aligned. We do STe. */
2398: VideoBase |= IoMem_ReadByte(0xff820d) & ~1;
2399: }
2400: pVideoRaster = &STRam[VideoBase];
2401: pSTScreen = pFrameBuffer->pSTScreen;
2402:
2403: Video_SetScreenRasters();
1.1.1.15 root 2404: Video_InitShifterLines();
1.1.1.11 root 2405: Spec512_StartVBL();
1.1.1.15 root 2406: Video_StartHBL(); /* Init ShifterFrame.ShifterLines[0] */
1.1.1.11 root 2407: }
2408:
2409:
2410: /*-----------------------------------------------------------------------*/
2411: /**
2412: * Get width, height and bpp according to TT-Resolution
2413: */
2414: void Video_GetTTRes(int *width, int *height, int *bpp)
2415: {
2416: switch (TTRes)
2417: {
2418: case ST_LOW_RES: *width = 320; *height = 200; *bpp = 4; break;
2419: case ST_MEDIUM_RES:*width = 640; *height = 200; *bpp = 2; break;
2420: case ST_HIGH_RES: *width = 640; *height = 400; *bpp = 1; break;
2421: case TT_LOW_RES: *width = 320; *height = 480; *bpp = 8; break;
2422: case TT_MEDIUM_RES:*width = 640; *height = 480; *bpp = 4; break;
2423: case TT_HIGH_RES: *width = 1280; *height = 960; *bpp = 1; break;
2424: default:
2425: fprintf(stderr, "TT res error!\n");
2426: *width = 320; *height = 200; *bpp = 4;
2427: break;
2428: }
2429: }
2430:
2431:
2432: /*-----------------------------------------------------------------------*/
2433: /**
2434: * Convert TT palette to SDL palette
2435: */
2436: static void Video_UpdateTTPalette(int bpp)
2437: {
2438: Uint32 ttpalette, src, dst;
2439: Uint8 r,g,b, lowbyte, highbyte;
2440: Uint16 stcolor, ttcolor;
2441: int i, offset, colors;
2442:
2443: ttpalette = 0xff8400;
2444:
2445: if (!bTTColorsSTSync)
2446: {
2447: /* sync TT ST-palette to TT-palette */
2448: src = 0xff8240; /* ST-palette */
2449: offset = (IoMem_ReadWord(0xff8262) & 0x0f);
1.1.1.13 root 2450: /*fprintf(stderr, "offset: %d\n", offset);*/
1.1.1.11 root 2451: dst = ttpalette + offset * 16*SIZE_WORD;
2452:
2453: for (i = 0; i < 16; i++)
2454: {
2455: stcolor = IoMem_ReadWord(src);
2456: ttcolor = ((stcolor&0x700) << 1) | ((stcolor&0x70) << 1) | ((stcolor&0x7) << 1);
2457: IoMem_WriteWord(dst, ttcolor);
2458: src += SIZE_WORD;
2459: dst += SIZE_WORD;
2460: }
1.1.1.15 root 2461: bTTColorsSTSync = true;
1.1.1.11 root 2462: }
2463:
2464: colors = 1 << bpp;
2465: if (bpp == 1)
2466: {
2467: /* Monochrome mode... palette is hardwired (?) */
2468: HostScreen_setPaletteColor(0, 255, 255, 255);
2469: HostScreen_setPaletteColor(1, 0, 0, 0);
2470: }
2471: else
2472: {
2473: for (i = 0; i < colors; i++)
2474: {
2475: lowbyte = IoMem_ReadByte(ttpalette++);
2476: highbyte = IoMem_ReadByte(ttpalette++);
2477: r = (lowbyte & 0x0f) << 4;
2478: g = (highbyte & 0xf0);
2479: b = (highbyte & 0x0f) << 4;
2480: //printf("%d: (%d,%d,%d)\n", i,r,g,b);
2481: HostScreen_setPaletteColor(i, r,g,b);
2482: }
2483: }
2484:
2485: HostScreen_updatePalette(colors);
1.1.1.15 root 2486: bTTColorsSync = true;
1.1.1.11 root 2487: }
2488:
2489:
2490: /*-----------------------------------------------------------------------*/
2491: /**
1.1.1.13 root 2492: * Update TT palette and blit TT screen using VIDEL code.
2493: * @return true if the screen contents changed
1.1.1.11 root 2494: */
1.1.1.16 root 2495: bool Video_RenderTTScreen(void)
1.1.1.11 root 2496: {
2497: static int nPrevTTRes = -1;
2498: int width, height, bpp;
2499:
2500: Video_GetTTRes(&width, &height, &bpp);
2501: if (TTRes != nPrevTTRes)
2502: {
2503: HostScreen_setWindowSize(width, height, 8);
2504: nPrevTTRes = TTRes;
2505: if (bpp == 1) /* Assert that mono palette will be used in mono mode */
1.1.1.15 root 2506: bTTColorsSync = false;
1.1.1.11 root 2507: }
2508:
2509: /* colors need synching? */
2510: if (!(bTTColorsSync && bTTColorsSTSync))
2511: {
2512: Video_UpdateTTPalette(bpp);
2513: }
2514:
2515: /* Yes, we are abusing the Videl routines for rendering the TT modes! */
2516: if (!HostScreen_renderBegin())
1.1.1.13 root 2517: return false;
1.1.1.16 root 2518: if (nScreenZoomX * nScreenZoomY != 1)
1.1.1.11 root 2519: VIDEL_ConvertScreenZoom(width, height, bpp, width * bpp / 16);
2520: else
2521: VIDEL_ConvertScreenNoZoom(width, height, bpp, width * bpp / 16);
2522: HostScreen_renderEnd();
1.1.1.15 root 2523: HostScreen_update1(false);
1.1.1.13 root 2524:
2525: return true;
1.1.1.11 root 2526: }
2527:
2528:
2529: /*-----------------------------------------------------------------------*/
2530: /**
2531: * Draw screen (either with ST/STE shifter drawing functions or with
2532: * Videl drawing functions)
2533: */
2534: static void Video_DrawScreen(void)
2535: {
2536: /* Skip frame if need to */
1.1.1.13 root 2537: if (nVBLs % (nFrameSkips+1))
1.1.1.11 root 2538: return;
2539:
2540: /* Use extended VDI resolution?
2541: * If so, just copy whole screen on VBL rather than per HBL */
2542: if (bUseVDIRes)
2543: Video_CopyVDIScreen();
2544:
2545: /* Now draw the screen! */
2546: if (ConfigureParams.System.nMachineType == MACHINE_FALCON && !bUseVDIRes)
2547: {
1.1.1.17! root 2548: VIDEL_renderScreen();
1.1.1.11 root 2549: }
2550: else if (ConfigureParams.System.nMachineType == MACHINE_TT && !bUseVDIRes)
2551: {
1.1.1.17! root 2552: Video_RenderTTScreen();
1.1.1.11 root 2553: }
2554: else
1.1.1.13 root 2555: {
2556: /* Before drawing the screen, ensure all unused lines are cleared to color 0 */
2557: /* (this can happen in 60 Hz when hatari is displaying the screen's border) */
2558: /* pSTScreen was set during Video_CopyScreenLineColor */
1.1.1.14 root 2559: if (!bUseVDIRes && nHBL < nLastVisibleHbl)
1.1.1.13 root 2560: memset(pSTScreen, 0, SCREENBYTES_LINE * ( nLastVisibleHbl - nHBL ) );
2561:
1.1.1.17! root 2562: Screen_Draw();
1.1.1.13 root 2563: }
1.1.1.11 root 2564: }
2565:
2566:
2567: /*-----------------------------------------------------------------------*/
2568: /**
1.1.1.15 root 2569: * Start HBL, Timer B and VBL interrupts.
2570: */
2571:
2572:
2573: /**
2574: * Start HBL or Timer B interrupt at position Pos. If position Pos was
2575: * already reached, then the interrupt is set on the next line.
2576: */
2577:
2578: static void Video_AddInterrupt ( int Pos , interrupt_id Handler )
2579: {
2580: int FrameCycles , HblCounterVideo , LineCycles;
2581:
2582: if ( nHBL >= nScanlinesPerFrame )
2583: return; /* don't set a new hbl/timer B if we're on the last line, as the vbl will happen first */
2584:
2585: Video_GetPosition ( &FrameCycles , &HblCounterVideo , &LineCycles );
1.1.1.16 root 2586: //fprintf ( stderr , "add int pos=%d handler=%d LineCycles=%d nCyclesPerLine=%d \n" , Pos , Handler , LineCycles , nCyclesPerLine );
1.1.1.15 root 2587:
2588: if ( LineCycles < Pos ) /* changed before reaching the new Pos on the current line */
1.1.1.16 root 2589: CycInt_AddRelativeInterrupt ( Pos - LineCycles , INT_CPU_CYCLE, Handler );
1.1.1.15 root 2590: else /* Pos will be applied on next line */
1.1.1.16 root 2591: CycInt_AddRelativeInterrupt ( Pos - LineCycles + nCyclesPerLine , INT_CPU_CYCLE, Handler );
1.1.1.15 root 2592: }
2593:
2594:
2595: static void Video_AddInterruptHBL ( int Pos )
2596: {
1.1.1.16 root 2597: //fprintf ( stderr , "add hbl pos=%d\n" , Pos );
1.1.1.15 root 2598: if ( !bUseVDIRes )
2599: Video_AddInterrupt ( Pos , INTERRUPT_VIDEO_HBL );
2600: }
2601:
2602:
2603: void Video_AddInterruptTimerB ( int Pos )
2604: {
1.1.1.16 root 2605: //fprintf ( stderr , "add timerb pos=%d\n" , Pos );
1.1.1.15 root 2606: if ( !bUseVDIRes )
2607: Video_AddInterrupt ( Pos , INTERRUPT_VIDEO_ENDLINE );
2608: }
2609:
2610:
2611: /**
2612: * Add some video interrupts to handle the first HBL and the first Timer B
2613: * in a new VBL. Also add an interrupt to trigger the next VBL.
2614: * This function is called from the VBL, so we use PendingCycleOver to take into account
2615: * the possible delay occurring when the VBL was executed.
1.1.1.16 root 2616: * In monochrome mode (71 Hz) a line is 224 cycles, which means if VBL is delayed
2617: * by a DIVS, FrameCycles can already be > 224 and we need to add an immediate
2618: * interrupt for hbl/timer in the next 4/8 cycles (else crash might happen as
2619: * line 0 processing would be skipped).
1.1.1.11 root 2620: */
1.1.1.15 root 2621: void Video_StartInterrupts ( int PendingCyclesOver )
1.1.1.11 root 2622: {
1.1.1.16 root 2623: int FrameCycles , HblCounterVideo , LineCycles;
2624: int Pos;
2625:
1.1.1.15 root 2626: /* HBL/Timer B are not emulated in VDI mode */
1.1.1.14 root 2627: if (!bUseVDIRes)
2628: {
1.1.1.16 root 2629: Video_GetPosition ( &FrameCycles , &HblCounterVideo , &LineCycles );
1.1.1.15 root 2630:
1.1.1.16 root 2631: /* Set Timer B interrupt for line 0 */
2632: Pos = Video_TimerB_GetPos ( 0 );
2633: if ( Pos > FrameCycles ) /* check Pos for line 0 was not already reached */
2634: Video_AddInterruptTimerB ( Pos );
2635: else /* the VBL was delayed by more than 1 HBL, add an immediate timer B */
2636: {
2637: LOG_TRACE(TRACE_VIDEO_VBL , "VBL %d delayed too much video_cyc=%d >= pos=%d for first timer B, add immediate timer B\n" ,
2638: nVBLs , FrameCycles , Pos );
2639: CycInt_AddRelativeInterrupt ( 4 , INT_CPU_CYCLE, INTERRUPT_VIDEO_ENDLINE );
2640: }
2641:
2642: /* Set HBL interrupt for line 0 */
2643: Pos = Video_HBL_GetPos();
2644: if ( Pos > FrameCycles ) /* check Pos for line 0 was not already reached */
2645: Video_AddInterruptHBL ( Pos );
2646: else /* the VBL was delayed by more than 1 HBL, add an immediate HBL */
2647: {
2648: LOG_TRACE(TRACE_VIDEO_VBL , "VBL %d delayed too much video_cyc=%d >= pos=%d for first HBL, add immediate HBL\n" ,
2649: nVBLs , FrameCycles , Pos );
2650: CycInt_AddRelativeInterrupt ( 8 , INT_CPU_CYCLE, INTERRUPT_VIDEO_HBL ); /* use 8 instead of 4 to happen after immediate timer b */
2651: }
1.1.1.14 root 2652: }
1.1.1.15 root 2653:
2654: /* TODO replace CYCLES_PER_FRAME */
1.1.1.16 root 2655: CyclesPerVBL = CYCLES_PER_FRAME;
2656: CycInt_AddRelativeInterrupt(CyclesPerVBL - PendingCyclesOver, INT_CPU_CYCLE, INTERRUPT_VIDEO_VBL);
1.1.1.11 root 2657: }
2658:
2659:
2660: /*-----------------------------------------------------------------------*/
2661: /**
1.1.1.15 root 2662: * VBL interrupt : set new interrupts, draw screen, generate sound,
2663: * reset counters, ...
1.1.1.11 root 2664: */
1.1.1.15 root 2665: void Video_InterruptHandler_VBL ( void )
1.1.1.11 root 2666: {
2667: int PendingCyclesOver;
1.1.1.9 root 2668:
1.1.1.11 root 2669: /* Store cycles we went over for this frame(this is our inital count) */
2670: PendingCyclesOver = -INT_CONVERT_FROM_INTERNAL ( PendingInterruptCount , INT_CPU_CYCLE ); /* +ve */
1.1.1.10 root 2671:
1.1.1.11 root 2672: /* Remove this interrupt from list and re-order */
1.1.1.16 root 2673: CycInt_AcknowledgeInterrupt();
1.1.1.9 root 2674:
1.1.1.14 root 2675: /* Increment the vbl jitter index */
2676: VblJitterIndex++;
2677: if ( VblJitterIndex == VBL_JITTER_MAX_POS )
2678: VblJitterIndex = 0;
2679:
1.1.1.11 root 2680: /* Set frame cycles, used for Video Address */
1.1.1.13 root 2681: Cycles_SetCounter(CYCLES_COUNTER_VIDEO, PendingCyclesOver + VblVideoCycleOffset);
1.1.1.9 root 2682:
1.1.1.11 root 2683: /* Clear any key presses which are due to be de-bounced (held for one ST frame) */
2684: Keymap_DebounceAllKeys();
1.1.1.9 root 2685:
1.1.1.11 root 2686: Video_DrawScreen();
1.1.1.9 root 2687:
1.1.1.11 root 2688: /* Check printer status */
2689: Printer_CheckIdleStatus();
2690:
2691: /* Update counter for number of screen refreshes per second */
2692: nVBLs++;
2693: /* Set video registers for frame */
2694: Video_ClearOnVBL();
1.1.1.15 root 2695:
1.1.1.17! root 2696: /* Videl Vertical counter reset (To be removed when Videl emulation is finished) */
! 2697: if (ConfigureParams.System.nMachineType == MACHINE_FALCON) {
! 2698: vfc_counter = 0;
! 2699: }
! 2700:
1.1.1.15 root 2701: /* Since we don't execute HBL functions in VDI mode, we've got to
2702: * initialize the first HBL palette here when VDI mode is enabled. */
2703: if (bUseVDIRes)
2704: Video_StoreFirstLinePalette();
2705:
2706: /* Start VBL, HBL and Timer B interrupts (this must be done after resetting
2707: * video cycle counter setting default freq values in Video_ClearOnVBL) */
2708: Video_StartInterrupts(PendingCyclesOver);
2709:
2710: /* Act on shortcut keys */
2711: ShortCut_ActKey();
2712:
1.1.1.16 root 2713: /* Record video frame is necessary */
2714: if ( bRecordingAvi )
2715: Avi_RecordVideoStream ();
2716:
1.1.1.11 root 2717: /* Store off PSG registers for YM file, is enabled */
2718: YMFormat_UpdateRecording();
2719: /* Generate 1/50th second of sound sample data, to be played by sound thread */
2720: Sound_Update_VBL();
2721:
1.1.1.15 root 2722: LOG_TRACE(TRACE_VIDEO_VBL , "VBL %d video_cyc=%d pending_cyc=%d jitter=%d\n" ,
1.1.1.14 root 2723: nVBLs , Cycles_GetCounter(CYCLES_COUNTER_VIDEO) , PendingCyclesOver , VblJitterArray[ VblJitterIndex ] );
1.1.1.11 root 2724:
1.1.1.16 root 2725: M68000_Exception(EXCEPTION_VBLANK, M68000_EXC_SRC_AUTOVEC); /* Vertical blank interrupt, level 4! */
1.1.1.11 root 2726:
2727: Main_WaitOnVbl();
1.1.1.9 root 2728: }
2729:
2730:
2731: /*-----------------------------------------------------------------------*/
1.1.1.11 root 2732: /**
1.1.1.13 root 2733: * Write to video address base high, med and low register (0xff8201/03/0d).
2734: * On STE, when a program writes to high or med registers, base low register
2735: * is reset to zero.
1.1.1.11 root 2736: */
1.1.1.9 root 2737: void Video_ScreenBaseSTE_WriteByte(void)
2738: {
1.1.1.13 root 2739: if ( ( IoAccessCurrentAddress == 0xff8201 ) || ( IoAccessCurrentAddress == 0xff8203 ) )
2740: IoMem[0xff820d] = 0; /* Reset screen base low register */
1.1.1.8 root 2741:
1.1.1.15 root 2742: if (LOG_TRACE_LEVEL(TRACE_VIDEO_STE))
1.1.1.11 root 2743: {
1.1.1.15 root 2744: int FrameCycles, HblCounterVideo, LineCycles;
2745:
2746: Video_GetPosition_OnWriteAccess ( &FrameCycles , &HblCounterVideo , &LineCycles );
2747:
2748: 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 2749: (IoMem[0xff8201]<<16)+(IoMem[0xff8203]<<8)+IoMem[0xff820d] ,
1.1.1.15 root 2750: FrameCycles, LineCycles, nHBL, HblCounterVideo, M68000_GetPC(), CurrentInstrCycles );
1.1.1.11 root 2751: }
1.1.1.8 root 2752: }
2753:
2754: /*-----------------------------------------------------------------------*/
1.1.1.11 root 2755: /**
2756: * Read video address counter and update ff8205/07/09
2757: */
2758: void Video_ScreenCounter_ReadByte(void)
1.1.1.8 root 2759: {
1.1.1.11 root 2760: Uint32 addr;
1.1.1.8 root 2761:
1.1.1.11 root 2762: addr = Video_CalculateAddress(); /* get current video address */
2763: IoMem[0xff8205] = ( addr >> 16 ) & 0xff;
2764: IoMem[0xff8207] = ( addr >> 8 ) & 0xff;
2765: IoMem[0xff8209] = addr & 0xff;
1.1.1.8 root 2766: }
2767:
1.1.1.9 root 2768: /*-----------------------------------------------------------------------*/
1.1.1.11 root 2769: /**
2770: * Write to video address counter (0xff8205, 0xff8207 and 0xff8209).
2771: * Called on STE only and like with base address, you cannot set lowest bit.
1.1.1.16 root 2772: *
2773: * As Hatari processes/converts one complete video line at a time, we have 3 cases :
2774: * - If display has not started yet for this line (left border), we can change pVideoRaster now.
2775: * We must take into account that the MMU starts 16 cycles earlier when hscroll is used.
2776: * - If display has stopped for this line (right border), we will change pVideoRaster
2777: * in Video_CopyScreenLineColor using pVideoRasterDelayed once the line has been processed.
2778: * - If the write is made while display is on, then we must compute an offset of what
2779: * the new address should have been, to correctly emulate the video address at the
2780: * end of the line while taking into account the fact that the video pointer is incrementing
2781: * during the active part of the line (this is the most "tricky" case)
2782: *
2783: * 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 2784: */
1.1.1.9 root 2785: void Video_ScreenCounter_WriteByte(void)
2786: {
1.1.1.11 root 2787: Uint8 AddrByte;
1.1.1.16 root 2788: Uint32 addr_cur;
2789: Uint32 addr_new = 0;
1.1.1.15 root 2790: int FrameCycles, HblCounterVideo, LineCycles;
1.1.1.13 root 2791: int Delayed;
1.1.1.16 root 2792: int MMUStartCycle;
1.1.1.11 root 2793:
1.1.1.15 root 2794: Video_GetPosition_OnWriteAccess ( &FrameCycles , &HblCounterVideo , &LineCycles );
1.1.1.11 root 2795:
2796: AddrByte = IoMem[ IoAccessCurrentAddress ];
2797:
1.1.1.16 root 2798: /* Get current video address from the shifter */
2799: addr_cur = Video_CalculateAddress();
2800: /* Correct the address in case a modification of ff8205/07/09 was already delayed */
2801: addr_new = addr_cur + VideoCounterDelayedOffset;
2802: /* Correct the address in case video counter was already modified in the right border */
2803: if ( pVideoRasterDelayed != NULL )
2804: addr_new = pVideoRasterDelayed - STRam;
2805:
2806: /* addr_new should now be the same as on a real STE */
2807: /* Compute the new video address with one modified byte */
2808: if ( IoAccessCurrentAddress == 0xff8205 )
2809: addr_new = ( addr_new & 0x00ffff ) | ( AddrByte << 16 );
2810: else if ( IoAccessCurrentAddress == 0xff8207 )
2811: addr_new = ( addr_new & 0xff00ff ) | ( AddrByte << 8 );
2812: else if ( IoAccessCurrentAddress == 0xff8209 )
2813: addr_new = ( addr_new & 0xffff00 ) | ( AddrByte );
2814:
2815: MMUStartCycle = Video_GetMMUStartCycle ( ShifterFrame.ShifterLines[ nHBL ].DisplayStartCycle );
2816:
1.1.1.11 root 2817: /* If display has not started, we can still modify pVideoRaster */
1.1.1.16 root 2818: /* We must also check the write does not overlap the end of the line (to be sure Video_EndHBL is called first) */
2819: if ( ( ( LineCycles <= MMUStartCycle ) && ( nHBL == HblCounterVideo ) )
1.1.1.11 root 2820: || ( nHBL < nStartHBL ) || ( nHBL >= nEndHBL ) )
2821: {
1.1.1.16 root 2822: pVideoRaster = &STRam[addr_new & ~1]; /* set new video address */
2823: VideoCounterDelayedOffset = 0;
2824: pVideoRasterDelayed = NULL;
1.1.1.15 root 2825: Delayed = false;
1.1.1.11 root 2826: }
2827:
1.1.1.16 root 2828: /* Display is OFF (right border) but we can't change pVideoRaster now, we must process Video_CopyScreenLineColor first */
2829: else if ( ( nHBL >= nStartHBL ) && ( nHBL < nEndHBL ) /* line should be active */
2830: && ( ( LineCycles > ShifterFrame.ShifterLines[ nHBL ].DisplayEndCycle ) /* we're in the right border */
2831: || ( HblCounterVideo == nHBL+1 ) ) ) /* or the write overlaps the next line and Video_EndHBL was not called yet */
2832: {
2833: VideoCounterDelayedOffset = 0;
2834: pVideoRasterDelayed = &STRam[addr_new & ~1]; /* new value for pVideoRaster at the end of Video_CopyScreenLineColor */
2835: Delayed = true;
2836: }
2837:
2838: /* Counter is modified while display is ON, store the bytes offset for Video_CopyScreenLineColor */
2839: /* Even on a real STE, modifying video address in this case will cause artefacts */
1.1.1.11 root 2840: else
2841: {
1.1.1.16 root 2842: VideoCounterDelayedOffset = addr_new - addr_cur;
2843: pVideoRasterDelayed = NULL;
1.1.1.15 root 2844: Delayed = true;
1.1.1.11 root 2845: }
2846:
1.1.1.16 root 2847: LOG_TRACE(TRACE_VIDEO_STE , "write ste video %x val=0x%x video_old=%x video_new=%x offset=%x delayed=%s"
2848: " video_cyc_w=%d line_cyc_w=%d @ nHBL=%d/video_hbl_w=%d pc=%x instr_cyc=%d\n" ,
2849: IoAccessCurrentAddress, AddrByte, addr_cur , addr_new , VideoCounterDelayedOffset , Delayed ? "yes" : "no" ,
1.1.1.15 root 2850: FrameCycles, LineCycles, nHBL, HblCounterVideo, M68000_GetPC(), CurrentInstrCycles );
1.1.1.9 root 2851: }
1.1.1.8 root 2852:
2853: /*-----------------------------------------------------------------------*/
1.1.1.11 root 2854: /**
2855: * Read video sync register (0xff820a)
2856: */
1.1.1.8 root 2857: void Video_Sync_ReadByte(void)
2858: {
1.1.1.17! root 2859: if ( (ConfigureParams.System.nMachineType == MACHINE_ST)
! 2860: || (ConfigureParams.System.nMachineType == MACHINE_STE)
! 2861: || (ConfigureParams.System.nMachineType == MACHINE_MEGA_STE) )
1.1.1.14 root 2862: IoMem[0xff820a] |= 0xfc; /* set unused bits 2-7 to 1 */
1.1.1.8 root 2863: }
2864:
2865: /*-----------------------------------------------------------------------*/
1.1.1.11 root 2866: /**
2867: * Read video base address low byte (0xff820d). A plain ST can only store
2868: * screen addresses rounded to 256 bytes (i.e. no lower byte).
2869: */
1.1.1.8 root 2870: void Video_BaseLow_ReadByte(void)
2871: {
1.1.1.11 root 2872: if (ConfigureParams.System.nMachineType == MACHINE_ST)
2873: IoMem[0xff820d] = 0; /* On ST this is always 0 */
1.1.1.9 root 2874:
1.1.1.11 root 2875: /* Note that you should not do anything here for STe because
2876: * VideoBase address is set in an interrupt and would be wrong
2877: * here. It's fine like this.
2878: */
1.1.1.8 root 2879: }
2880:
2881: /*-----------------------------------------------------------------------*/
1.1.1.11 root 2882: /**
2883: * Read video line width register (0xff820f)
2884: */
1.1.1.8 root 2885: void Video_LineWidth_ReadByte(void)
2886: {
1.1.1.11 root 2887: if (ConfigureParams.System.nMachineType == MACHINE_ST)
2888: IoMem[0xff820f] = 0; /* On ST this is always 0 */
2889: else
2890: IoMem[0xff820f] = LineWidth;
1.1.1.8 root 2891: }
2892:
2893: /*-----------------------------------------------------------------------*/
1.1.1.11 root 2894: /**
2895: * Read video shifter mode register (0xff8260)
2896: */
1.1.1.8 root 2897: void Video_ShifterMode_ReadByte(void)
2898: {
1.1.1.11 root 2899: if (bUseHighRes)
1.1.1.14 root 2900: IoMem[0xff8260] = 2; /* If mono monitor, force to high resolution */
1.1.1.11 root 2901: else
1.1.1.17! root 2902: IoMem[0xff8260] = VideoShifterByte; /* Only use bits 0 and 1, unused bits 2-7 are set to 0 */
1.1.1.14 root 2903:
1.1.1.17! root 2904: if (ConfigureParams.System.nMachineType == MACHINE_ST)
! 2905: IoMem[0xff8260] |= 0xfc; /* On STF, set unused bits 2-7 to 1 */
1.1.1.8 root 2906: }
2907:
1.1.1.10 root 2908: /*-----------------------------------------------------------------------*/
1.1.1.11 root 2909: /**
2910: * Read horizontal scroll register (0xff8265)
2911: */
1.1.1.10 root 2912: void Video_HorScroll_Read(void)
2913: {
1.1.1.11 root 2914: IoMem[0xff8265] = HWScrollCount;
1.1.1.10 root 2915: }
1.1.1.8 root 2916:
2917: /*-----------------------------------------------------------------------*/
1.1.1.11 root 2918: /**
2919: * Write video line width register (0xff820f) - STE only.
2920: * Content of LineWidth is added to the shifter counter when display is
2921: * turned off (start of the right border, usually at cycle 376)
2922: */
1.1.1.10 root 2923: void Video_LineWidth_WriteByte(void)
2924: {
1.1.1.11 root 2925: Uint8 NewWidth;
1.1.1.15 root 2926: int FrameCycles, HblCounterVideo, LineCycles;
1.1.1.13 root 2927: int Delayed;
1.1.1.11 root 2928:
1.1.1.15 root 2929: Video_GetPosition_OnWriteAccess ( &FrameCycles , &HblCounterVideo , &LineCycles );
1.1.1.11 root 2930:
2931: NewWidth = IoMem_ReadByte(0xff820f);
2932:
2933: /* We must also check the write does not overlap the end of the line */
1.1.1.15 root 2934: if ( ( ( nHBL == HblCounterVideo ) && ( LineCycles <= ShifterFrame.ShifterLines[ HblCounterVideo ].DisplayEndCycle ) )
1.1.1.11 root 2935: || ( nHBL < nStartHBL ) || ( nHBL >= nEndHBL ) )
1.1.1.13 root 2936: {
1.1.1.11 root 2937: LineWidth = NewWidth; /* display is on, we can still change */
1.1.1.13 root 2938: NewLineWidth = -1; /* cancel 'pending' change */
1.1.1.15 root 2939: Delayed = false;
1.1.1.13 root 2940: }
1.1.1.11 root 2941: else
1.1.1.13 root 2942: {
1.1.1.11 root 2943: NewLineWidth = NewWidth; /* display is off, can't change LineWidth once in right border */
1.1.1.15 root 2944: Delayed = true;
1.1.1.13 root 2945: }
1.1.1.11 root 2946:
1.1.1.15 root 2947: 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 2948: NewWidth, Delayed ? "yes" : "no" ,
1.1.1.15 root 2949: FrameCycles, LineCycles, nHBL, HblCounterVideo, M68000_GetPC(), CurrentInstrCycles );
1.1.1.10 root 2950: }
2951:
2952: /*-----------------------------------------------------------------------*/
1.1.1.11 root 2953: /**
2954: * Write to video shifter palette registers (0xff8240-0xff825e)
1.1.1.14 root 2955: *
2956: * Note that there's a special "strange" case when writing only to the upper byte
2957: * of the color reg (instead of writing 16 bits at once with .W/.L).
2958: * In that case, the byte written to address x is automatically written
2959: * to address x+1 too (but we shouldn't copy x in x+1 after masking x ; we apply the mask at the end)
2960: * So : move.w #0,$ff8240 -> color 0 is now $000
2961: * move.b #7,$ff8240 -> color 0 is now $707 !
2962: * move.b #$55,$ff8241 -> color 0 is now $755 ($ff8240 remains unchanged)
2963: * move.b #$71,$ff8240 -> color 0 is now $171 (bytes are first copied, then masked)
1.1.1.11 root 2964: */
1.1.1.8 root 2965: static void Video_ColorReg_WriteWord(Uint32 addr)
2966: {
1.1.1.15 root 2967: if (!bUseHighRes && !bUseVDIRes) /* Don't store if hi-res or VDI resolution */
1.1.1.11 root 2968: {
2969: int idx;
2970: Uint16 col;
2971: Video_SetHBLPaletteMaskPointers(); /* Set 'pHBLPalettes' etc.. according cycles into frame */
2972: col = IoMem_ReadWord(addr);
1.1.1.14 root 2973:
2974: /* Handle special case when writing only to the upper byte of the color reg */
2975: if ( ( nIoMemAccessSize == SIZE_BYTE ) && ( ( IoAccessCurrentAddress & 1 ) == 0 ) )
2976: col = ( IoMem_ReadByte(addr) << 8 ) + IoMem_ReadByte(addr); /* copy upper byte into lower byte */
2977:
1.1.1.11 root 2978: if (ConfigureParams.System.nMachineType == MACHINE_ST)
2979: col &= 0x777; /* Mask off to ST 512 palette */
2980: else
2981: col &= 0xfff; /* Mask off to STe 4096 palette */
2982: IoMem_WriteWord(addr, col); /* (some games write 0xFFFF and read back to see if STe) */
2983: Spec512_StoreCyclePalette(col, addr); /* Store colour into CyclePalettes[] */
2984: idx = (addr-0xff8240)/2; /* words */
2985: pHBLPalettes[idx] = col; /* Set colour x */
2986: *pHBLPaletteMasks |= 1 << idx; /* And mask */
2987:
1.1.1.15 root 2988: if (LOG_TRACE_LEVEL(TRACE_VIDEO_COLOR))
1.1.1.11 root 2989: {
1.1.1.15 root 2990: int FrameCycles, HblCounterVideo, LineCycles;
2991:
2992: Video_GetPosition_OnWriteAccess ( &FrameCycles , &HblCounterVideo , &LineCycles );
2993:
2994: 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" ,
2995: addr, col,
2996: FrameCycles, LineCycles, nHBL, HblCounterVideo, M68000_GetPC(), CurrentInstrCycles );
1.1.1.11 root 2997: }
2998:
2999: }
1.1.1.8 root 3000: }
3001:
3002: void Video_Color0_WriteWord(void)
3003: {
1.1.1.11 root 3004: Video_ColorReg_WriteWord(0xff8240);
1.1.1.8 root 3005: }
3006:
3007: void Video_Color1_WriteWord(void)
3008: {
1.1.1.11 root 3009: Video_ColorReg_WriteWord(0xff8242);
1.1.1.8 root 3010: }
3011:
3012: void Video_Color2_WriteWord(void)
3013: {
1.1.1.11 root 3014: Video_ColorReg_WriteWord(0xff8244);
1.1.1.8 root 3015: }
3016:
3017: void Video_Color3_WriteWord(void)
3018: {
1.1.1.11 root 3019: Video_ColorReg_WriteWord(0xff8246);
1.1.1.8 root 3020: }
3021:
3022: void Video_Color4_WriteWord(void)
3023: {
1.1.1.11 root 3024: Video_ColorReg_WriteWord(0xff8248);
1.1.1.8 root 3025: }
3026:
3027: void Video_Color5_WriteWord(void)
3028: {
1.1.1.11 root 3029: Video_ColorReg_WriteWord(0xff824a);
1.1.1.8 root 3030: }
3031:
3032: void Video_Color6_WriteWord(void)
3033: {
1.1.1.11 root 3034: Video_ColorReg_WriteWord(0xff824c);
1.1.1.8 root 3035: }
3036:
3037: void Video_Color7_WriteWord(void)
3038: {
1.1.1.11 root 3039: Video_ColorReg_WriteWord(0xff824e);
1.1.1.8 root 3040: }
3041:
3042: void Video_Color8_WriteWord(void)
3043: {
1.1.1.11 root 3044: Video_ColorReg_WriteWord(0xff8250);
1.1.1.8 root 3045: }
3046:
3047: void Video_Color9_WriteWord(void)
3048: {
1.1.1.11 root 3049: Video_ColorReg_WriteWord(0xff8252);
1.1.1.8 root 3050: }
3051:
3052: void Video_Color10_WriteWord(void)
3053: {
1.1.1.11 root 3054: Video_ColorReg_WriteWord(0xff8254);
1.1.1.8 root 3055: }
3056:
3057: void Video_Color11_WriteWord(void)
3058: {
1.1.1.11 root 3059: Video_ColorReg_WriteWord(0xff8256);
1.1.1.8 root 3060: }
3061:
3062: void Video_Color12_WriteWord(void)
3063: {
1.1.1.11 root 3064: Video_ColorReg_WriteWord(0xff8258);
1.1.1.8 root 3065: }
3066:
3067: void Video_Color13_WriteWord(void)
3068: {
1.1.1.11 root 3069: Video_ColorReg_WriteWord(0xff825a);
1.1.1.8 root 3070: }
3071:
3072: void Video_Color14_WriteWord(void)
3073: {
1.1.1.11 root 3074: Video_ColorReg_WriteWord(0xff825c);
1.1.1.8 root 3075: }
3076:
3077: void Video_Color15_WriteWord(void)
3078: {
1.1.1.11 root 3079: Video_ColorReg_WriteWord(0xff825e);
1.1.1.8 root 3080: }
3081:
3082:
3083: /*-----------------------------------------------------------------------*/
1.1.1.11 root 3084: /**
3085: * Write video shifter mode register (0xff8260)
3086: */
1.1.1.8 root 3087: void Video_ShifterMode_WriteByte(void)
3088: {
1.1.1.11 root 3089: if (ConfigureParams.System.nMachineType == MACHINE_TT)
3090: {
3091: TTRes = IoMem_ReadByte(0xff8260) & 7;
3092: IoMem_WriteByte(0xff8262, TTRes); /* Copy to TT shifter mode register */
3093: }
1.1.1.17! root 3094:
1.1.1.11 root 3095: if (ConfigureParams.System.nMachineType == MACHINE_FALCON)
1.1.1.17! root 3096: VIDEL_ST_ShiftModeWriteByte();
1.1.1.15 root 3097:
3098: if (/*!bUseHighRes &&*/ !bUseVDIRes) /* Don't store if hi-res and don't store if VDI resolution */
1.1.1.11 root 3099: {
1.1.1.13 root 3100: VideoShifterByte = IoMem[0xff8260] & 3; /* We only care for lower 2-bits */
3101: if ( VideoShifterByte == 3 ) /* 3 is not a valid resolution, use low res instead */
3102: {
3103: VideoShifterByte = 0;
3104: IoMem_WriteByte(0xff8260,0);
3105: }
1.1.1.11 root 3106: Video_WriteToShifter(VideoShifterByte);
3107: Video_SetHBLPaletteMaskPointers();
3108: *pHBLPaletteMasks &= 0xff00ffff;
3109: /* Store resolution after palette mask and set resolution write bit: */
3110: *pHBLPaletteMasks |= (((Uint32)VideoShifterByte|0x04)<<16);
3111: }
1.1.1.10 root 3112: }
3113:
3114: /*-----------------------------------------------------------------------*/
1.1.1.11 root 3115: /**
1.1.1.13 root 3116: * Handle horizontal scrolling to the left.
3117: * On STE, there're 2 registers that can scroll the line :
3118: * - $ff8264 : scroll without prefetch
1.1.1.14 root 3119: * - $ff8265 : scroll with prefetch
1.1.1.13 root 3120: * Both registers will scroll the line to the left by skipping the amount
3121: * of pixels in $ff8264 or $ff8265 (from 0 to 15).
3122: * As some pixels will be skipped, this means the shifter needs to read
3123: * 16 other pixels in advance in some internal registers to have an uninterrupted flow of pixels.
3124: *
1.1.1.14 root 3125: * These 16 pixels can be prefetched before the display starts (on cycle 56 for example) when using
1.1.1.13 root 3126: * $ff8265 to scroll the line. In that case 8 more bytes per line (low res) will be read. Most programs
3127: * are using $ff8265 to scroll the line.
3128: *
3129: * When using $ff8264, the next 16 pixels will not be prefetched before the display
3130: * starts, they will be read when the display normally starts (cycle 56). While
3131: * reading these 16 pixels, the shifter won't be able to display anything, which will
3132: * result in 16 pixels having the color 0. So, reading the 16 pixels will in fact delay
3133: * the real start of the line, which will look as if it started 16 pixels later. As the
3134: * shifter will stop the display at cycle 56+320 anyway, this means the last 16 pixels
3135: * of each line won't be displayed and you get the equivalent of a shorter 304 pixels line.
3136: * As a consequence, this register is rarely used to scroll the line.
3137: *
3138: * By writing a value > 0 in $ff8265 (to start prefetching) and immediatly after a value of 0
3139: * in $ff8264 (no scroll and no prefetch), it's possible to fill the internal registers used
3140: * for the scrolling even if scrolling is set to 0. In that case, the shifter will start displaying
3141: * each line 16 pixels earlier (as the data are already available in the internal registers).
3142: * This allows to have 336 pixels per line (instead of 320) for all the remaining lines on the screen.
3143: *
3144: * Although some programs are using this sequence :
3145: * move.w #1,$ffff8264 ; Word access!
3146: * clr.b $ffff8264 ; Byte access!
3147: * It is also possible to add 16 pixels by doing :
3148: * move.b #X,$ff8265 ; with X > 0
3149: * move.b #0,$ff8264
1.1.1.11 root 3150: * Some games (Obsession, Skulls) and demos (Pacemaker by Paradox) use this
3151: * feature to increase the resolution, so we have to emulate this bug, too!
1.1.1.13 root 3152: *
3153: * So considering a low res line of 320 pixels (160 bytes) :
3154: * - if both $ff8264/65 are 0, no scrolling happens, the shifter reads 160 bytes and displays 320 pixels (same as STF)
3155: * - if $ff8265 > 0, line is scrolled, the shifter reads 168 bytes and displays 320 pixels.
3156: * - if $ff8264 > 0, line is scrolled, the shifter reads 160 bytes and displays 304 pixels,
3157: * the display starts 16 pixels later.
3158: * - if $ff8265 > 0 and then $ff8264 = 0, there's no scrolling, the shifter reads 168 bytes and displays 336 pixels,
3159: * the display starts 16 pixels earlier.
1.1.1.11 root 3160: */
1.1.1.13 root 3161:
3162: void Video_HorScroll_Write_8264(void)
3163: {
3164: Video_HorScroll_Write();
3165: }
3166:
3167: void Video_HorScroll_Write_8265(void)
3168: {
3169: Video_HorScroll_Write();
3170: }
3171:
1.1.1.10 root 3172: void Video_HorScroll_Write(void)
3173: {
1.1.1.13 root 3174: Uint32 RegAddr;
1.1.1.11 root 3175: Uint8 ScrollCount;
1.1.1.13 root 3176: Uint8 Prefetch;
1.1.1.15 root 3177: int FrameCycles, HblCounterVideo, LineCycles;
3178: bool Add16px = false;
1.1.1.13 root 3179: static Uint8 LastVal8265 = 0;
3180: int Delayed;
3181:
1.1.1.15 root 3182: Video_GetPosition_OnWriteAccess ( &FrameCycles , &HblCounterVideo , &LineCycles );
1.1.1.10 root 3183:
1.1.1.13 root 3184: RegAddr = IoAccessCurrentAddress; /* 0xff8264 or 0xff8265 */
3185: ScrollCount = IoMem[ RegAddr ];
1.1.1.11 root 3186: ScrollCount &= 0x0f;
1.1.1.10 root 3187:
1.1.1.13 root 3188: if ( RegAddr == 0xff8264 )
3189: {
3190: Prefetch = 0; /* scroll without prefetch */
1.1.1.15 root 3191: LastCycleScroll8264 = FrameCycles;
1.1.1.11 root 3192:
1.1.1.15 root 3193: ShifterFrame.Scroll8264Pos.VBL = nVBLs;
3194: ShifterFrame.Scroll8264Pos.FrameCycles = FrameCycles;
3195: ShifterFrame.Scroll8264Pos.HBL = HblCounterVideo;
3196: ShifterFrame.Scroll8264Pos.LineCycles = LineCycles;
3197:
3198: if ( ( ScrollCount == 0 ) && ( LastVal8265 > 0 )
3199: && ( ShifterFrame.Scroll8265Pos.VBL > 0 ) /* a write to ff8265 has been made */
3200: && ( ShifterFrame.Scroll8265Pos.VBL == ShifterFrame.Scroll8264Pos.VBL ) /* during the same VBL */
3201: && ( ShifterFrame.Scroll8264Pos.FrameCycles - ShifterFrame.Scroll8265Pos.FrameCycles <= 40 ) )
1.1.1.13 root 3202: {
1.1.1.15 root 3203: LOG_TRACE(TRACE_VIDEO_BORDER_H , "detect ste left+16 pixels\n" );
3204: Add16px = true;
1.1.1.13 root 3205: }
3206: }
3207: else
1.1.1.11 root 3208: {
1.1.1.13 root 3209: Prefetch = 1; /* scroll with prefetch */
1.1.1.15 root 3210: LastCycleScroll8265 = FrameCycles;
3211:
3212: ShifterFrame.Scroll8265Pos.VBL = nVBLs;
3213: ShifterFrame.Scroll8265Pos.FrameCycles = FrameCycles;
3214: ShifterFrame.Scroll8265Pos.HBL = HblCounterVideo;
3215: ShifterFrame.Scroll8265Pos.LineCycles = LineCycles;
3216:
1.1.1.13 root 3217: LastVal8265 = ScrollCount;
1.1.1.15 root 3218: Add16px = false;
1.1.1.11 root 3219: }
1.1.1.13 root 3220:
3221:
3222: /* If the write was made before display starts on the current line, then */
3223: /* we can still change the value now. Else, the new values will be used */
3224: /* for line n+1. */
3225: /* We must also check the write does not overlap the end of the line */
1.1.1.15 root 3226: if ( ( ( LineCycles <= LINE_START_CYCLE_50 ) && ( nHBL == HblCounterVideo ) )
1.1.1.13 root 3227: || ( nHBL < nStartHBL ) || ( nHBL >= nEndHBL ) )
1.1.1.11 root 3228: {
1.1.1.13 root 3229: HWScrollCount = ScrollCount; /* display has not started, we can still change */
3230: HWScrollPrefetch = Prefetch;
3231: bSteBorderFlag = Add16px;
3232: NewHWScrollCount = -1; /* cancel 'pending' change */
1.1.1.15 root 3233: Delayed = false;
1.1.1.11 root 3234: }
3235: else
3236: {
1.1.1.13 root 3237: NewHWScrollCount = ScrollCount; /* display has started, can't change HWScrollCount now */
3238: NewHWScrollPrefetch = Prefetch;
3239: if ( Add16px )
3240: NewSteBorderFlag = 1;
3241: else
3242: NewSteBorderFlag = 0;
1.1.1.15 root 3243: Delayed = true;
1.1.1.11 root 3244: }
3245:
1.1.1.15 root 3246: 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 3247: RegAddr , ScrollCount, Delayed ? "yes" : "no" ,
1.1.1.15 root 3248: FrameCycles, LineCycles, nHBL, HblCounterVideo, M68000_GetPC(), CurrentInstrCycles );
1.1.1.13 root 3249: }
1.1.1.11 root 3250:
3251: /*-----------------------------------------------------------------------*/
3252: /**
3253: * Write to TT shifter mode register (0xff8262)
3254: */
3255: void Video_TTShiftMode_WriteWord(void)
3256: {
3257: TTRes = IoMem_ReadByte(0xff8262) & 7;
3258:
3259: /*fprintf(stderr, "Write to FF8262: %x, res=%i\n", IoMem_ReadWord(0xff8262), TTRes);*/
3260:
3261: /* Is it an ST compatible resolution? */
3262: if (TTRes <= 2)
3263: {
3264: IoMem_WriteByte(0xff8260, TTRes);
3265: Video_ShifterMode_WriteByte();
3266: }
3267: }
3268:
3269: /*-----------------------------------------------------------------------*/
3270: /**
3271: * Write to TT color register (0xff8400)
3272: */
3273: void Video_TTColorRegs_WriteWord(void)
3274: {
1.1.1.15 root 3275: bTTColorsSync = false;
1.1.1.11 root 3276: }
3277:
3278: /*-----------------------------------------------------------------------*/
3279: /**
1.1.1.15 root 3280: * Write to ST color register on TT (0xff8240)
1.1.1.11 root 3281: */
3282: void Video_TTColorSTRegs_WriteWord(void)
3283: {
1.1.1.15 root 3284: bTTColorsSTSync = false;
1.1.1.8 root 3285: }
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