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1.1 root 1: /*
1.1.1.7 root 2: Hatari - spec512.c
1.1 root 3:
1.1.1.17 root 4: This file is distributed under the GNU General Public License, version 2
5: or at your option any later version. Read the file gpl.txt for details.
1.1 root 6:
1.1.1.7 root 7: Handle storing of writes to ST palette using clock-cycle counts. We can use
8: this to accurately any form of Spectrum512 style images - even down to the
9: way the screen colours change on decompression routines in menus!
10:
11: As the 68000 has a 4-clock cycle increment we can only change palette every
12: 4 cycles. This means that on one scanline (512 cycles in 50Hz) we have just
13: 512/4=128 places where palette writes can take place. We keep track of this
14: in a table (storing on each scanline and color writes and the cycles on the
15: scanline where they happen). When we draw the screen we simply keep a
16: cycle-count on the line and check this with our table and update the 16-color
17: palette with each change. As the table is already ordered this makes things
18: very simple. Speed is a problem, though, as the palette can change once every
19: 4 pixels - that's a lot of processing.
1.1 root 20: */
1.1.1.10 root 21:
22:
23: /* 2008/01/12 [NP] In Spec512_StoreCyclePalette, don't use Cycles_GetCounterOnWriteAccess */
24: /* as it doesn't support movem for example. Use Cycles_GetCounter with */
25: /* an average correction of 8 cycles (this should be fixed). */
26: /* In Spec512_StartScanLine, better handling of SCREENBYTES_LEFT when */
27: /* border are present. Better alignement of pixel and color when left */
28: /* border is removed (Rotofull in Nostalgia Demo, When Colors Are Going */
29: /* Bang Bang by DF in Punish Your Machine). */
30: /* 2008/01/13 [NP] In Spec512_StoreCyclePalette, if a movem was used to access several */
31: /* color regs just before the end of a line, the value for nHorPos was not */
32: /* checked and could take values >= 512, which means some colors in the */
33: /* palette were overwritten next time colors were stored on the next line */
34: /* and the palette was not set correctly, especially in the bottom of the */
35: /* screen (Decade Demo Main Menu, Punish Your Machine Main Menu, ULM */
36: /* Hidden Screen in Oh Crickey...). */
37: /* 2008/01/13 [NP] One line should contain 512/4 + 1 colors slots, not 512/4. Else, if */
38: /* a program manages to change colors every 4 cycles, the '-1' terminator */
39: /* added by Spec512_StartFrame will in fact be written on cycle 0 in the */
40: /* next line (this is theorical, practically no program changes the color */
41: /* 128 times per line). */
42: /* Use nCyclesPerLine instead of 512 to check if nHorPos is too big and if */
43: /* the colors must be stored on the next line when freq is 50 or 60Hz */
44: /* (readme.prg by TEX (in 1987)) */
45: /* 2008/01/24 [NP] In Spec512_StartScanLine, use different values for LineStartCycle when */
46: /* running in 50 Hz or 60 Hz (TEX Spectrum Slideshow in 60 Hz). */
1.1.1.13 root 47: /* 2008/12/14 [NP] In Spec512_StoreCyclePalette, instead of approximating write position */
48: /* by Cycles_GetCounter+8, we use different cases for movem, .l acces and */
49: /* .w acces (similar to cycles.c). This gives correct results when using */
50: /* "move.w d0,(a0) or move.w (a0)+,(a1)+" for example, which were shifted */
51: /* 8 or 4 pixels too late. Calibration was made using a custom program to */
52: /* compare the results with a real STF in different cases (fix Froggies */
53: /* Over The Fence Main Menu). */
1.1.1.14 root 54: /* 2008/12/21 [NP] Use BusMode to adjust Cycles_GetCounterOnReadAccess and */
55: /* Cycles_GetCounterOnWriteAccess depending on who is owning the */
56: /* bus (cpu, blitter). */
57: /* 2009/07/28 [NP] Use different timings for movem.l and movem.w */
1.1.1.18! root 58: /* 2014/01/02 [NP] In Spec512_StoreCyclePalette, write occurs during the last cycles for */
! 59: /* i_ADD and i_SUB (fix 'add d1,(a0)' in '4-pixel plasma' by TOS Crew). */
1.1.1.10 root 60:
61:
1.1.1.14 root 62: const char Spec512_fileid[] = "Hatari spec512.c : " __DATE__ " " __TIME__;
1.1 root 63:
1.1.1.18! root 64: #include <SDL_endian.h>
1.1.1.4 root 65:
1.1 root 66: #include "main.h"
1.1.1.9 root 67: #include "cycles.h"
1.1.1.15 root 68: #include "cycInt.h"
1.1.1.10 root 69: #include "m68000.h"
1.1.1.13 root 70: #include "ioMem.h"
1.1 root 71: #include "screen.h"
72: #include "spec512.h"
73: #include "video.h"
1.1.1.10 root 74: #include "configuration.h"
1.1.1.12 root 75:
1.1 root 76:
1.1.1.9 root 77: /* As 68000 clock multiple of 4 this mean we can only write to the palette this many time per scanline */
1.1.1.10 root 78: #define MAX_CYCLEPALETTES_PERLINE ((512/4) + 1) /* +1 for the '-1' added as a line's terminator */
1.1.1.9 root 79:
80: /* Store writes to palette by cycles per scan line, colour and index in ST */
81: typedef struct
82: {
1.1.1.10 root 83: int LineCycles; /* Number of cycles into line (MUST be div by 4) */
84: Uint16 Colour; /* ST Colour value */
85: Uint16 Index; /* Index into ST palette (0...15) */
86: }
87: CYCLEPALETTE;
1.1.1.2 root 88:
1.1.1.8 root 89: /* 314k; 1024-bytes per line */
1.1.1.9 root 90: static CYCLEPALETTE CyclePalettes[(MAX_SCANLINES_PER_FRAME+1)*MAX_CYCLEPALETTES_PERLINE];
91: static CYCLEPALETTE *pCyclePalette;
92: static int nCyclePalettes[(MAX_SCANLINES_PER_FRAME+1)]; /* Number of entries in above table for each scanline */
1.1.1.10 root 93: static int nPalettesAccesses; /* Number of times accessed palette registers */
1.1.1.8 root 94: static Uint16 CycleColour;
95: static int CycleColourIndex;
96: static int nScanLine, ScanLineCycleCount;
1.1.1.12 root 97: static bool bIsSpec512Display;
1.1 root 98:
1.1.1.4 root 99: #if SDL_BYTEORDER == SDL_BIG_ENDIAN
1.1.1.10 root 100: static const int STRGBPalEndianTable[16] =
101: {
102: 0,2,1,3,8,10,9,11,4,6,5,7,12,14,13,15
103: };
1.1.1.4 root 104: #endif
105:
1.1.1.2 root 106:
107: /*-----------------------------------------------------------------------*/
1.1.1.10 root 108: /**
1.1.1.16 root 109: * Return true if this frame is a Spectrum 512 style image (can be low/med
110: * res mix).
1.1.1.10 root 111: */
1.1.1.12 root 112: bool Spec512_IsImage(void)
1.1 root 113: {
1.1.1.16 root 114: /* Spec512 mode was triggered in low or med res ? */
115: if (bIsSpec512Display)
1.1.1.14 root 116: return true;
1.1 root 117:
1.1.1.14 root 118: return false;
1.1 root 119: }
120:
1.1.1.2 root 121:
122: /*-----------------------------------------------------------------------*/
1.1.1.10 root 123: /**
1.1.1.14 root 124: * We store every palette access in a table to perform Spectrum 512 color
125: * effects. This is cleared on each VBL.
1.1.1.10 root 126: */
1.1 root 127: void Spec512_StartVBL(void)
128: {
1.1.1.10 root 129: /* Clear number of cycle palettes on each frame */
130: memset(nCyclePalettes, 0x0, sizeof(nCyclePalettes));
131:
1.1.1.14 root 132: /* Clear number of times accessed on entry in palette (used to check if
133: * it is true Spectrum 512 image) */
1.1.1.10 root 134: nPalettesAccesses = 0;
135:
136: /* Set as not Spectrum 512 displayed image */
1.1.1.14 root 137: bIsSpec512Display = false;
1.1 root 138: }
139:
1.1.1.2 root 140:
141: /*-----------------------------------------------------------------------*/
1.1.1.10 root 142: /**
143: * Store color into table 'CyclePalettes[]' for screen conversion according
144: * to cycles into frame.
145: */
1.1.1.8 root 146: void Spec512_StoreCyclePalette(Uint16 col, Uint32 addr)
1.1 root 147: {
1.1.1.10 root 148: CYCLEPALETTE *pTmpCyclePalette;
149: int FrameCycles, ScanLine, nHorPos;
1.1 root 150:
1.1.1.10 root 151: if (!ConfigureParams.Screen.nSpec512Threshold)
152: return;
1.1.1.4 root 153:
1.1.1.10 root 154: CycleColour = col;
155: CycleColourIndex = (addr-0xff8240)>>1;
1.1 root 156:
1.1.1.10 root 157: /* Find number of cycles into frame */
158: /* FIXME [NP] We should use Cycles_GetCounterOnWriteAccess, but it wouldn't */
159: /* work when using multiple accesses instructions like move.l or movem */
160: /* To correct this, assume a delay of 8 cycles (should give a good approximation */
161: /* of a move.w or movem.l for example) */
162: // FrameCycles = Cycles_GetCounterOnWriteAccess(CYCLES_COUNTER_VIDEO);
1.1.1.13 root 163: if ( BusMode == BUS_MODE_BLITTER )
164: {
165: FrameCycles = Cycles_GetCounterOnWriteAccess(CYCLES_COUNTER_VIDEO);
166: }
167: else /* BUS_MODE_CPU */
168: {
169: #ifdef OLD_CYC_PAL
170: FrameCycles = Cycles_GetCounter(CYCLES_COUNTER_VIDEO) + 8;
171: #else
172: if ( OpcodeFamily == i_MVMLE )
173: {
1.1.1.14 root 174: // FrameCycles = Cycles_GetCounter(CYCLES_COUNTER_VIDEO) + 8;
175: FrameCycles = Cycles_GetCounter(CYCLES_COUNTER_VIDEO)
176: + (CurrentInstrCycles & ~3);
177: if (nIoMemAccessSize == SIZE_LONG) /* long access */
178: FrameCycles -= 0;
179: else /* word access */
180: FrameCycles -= 4;
181: }
1.1.1.18! root 182: else if ( ( OpcodeFamily == i_ADD ) || ( OpcodeFamily == i_SUB ) )
! 183: {
! 184: FrameCycles = Cycles_GetCounter(CYCLES_COUNTER_VIDEO)
! 185: + (CurrentInstrCycles & ~3);
! 186: FrameCycles -= 0; /* write is made at the end, after prefetch */
! 187: }
! 188: else /* default case write, then prefetch (mostly for 'move') */
1.1.1.14 root 189: {
190: FrameCycles = Cycles_GetCounter(CYCLES_COUNTER_VIDEO)
191: + (CurrentInstrCycles & ~3);
192: if (nIoMemAccessSize == SIZE_LONG) /* long access */
193: FrameCycles -= 8;
194: else /* word/byte access */
195: FrameCycles -= 4;
1.1.1.13 root 196: }
197: #endif
198: }
1.1.1.10 root 199:
200:
201: /* Find scan line we are currently on and get index into cycle-palette table */
1.1.1.14 root 202: Video_ConvertPosition ( FrameCycles , &ScanLine , &nHorPos );
1.1.1.11 root 203:
204: if (ScanLine > MAX_SCANLINES_PER_FRAME)
205: return;
206:
1.1.1.10 root 207: pTmpCyclePalette = &CyclePalettes[ (ScanLine*MAX_CYCLEPALETTES_PERLINE) + nCyclePalettes[ScanLine] ];
208:
209:
210: /* Do we have a previous entry at the same cycles? If so, 68000 have used a 'move.l' instruction so stagger writes */
211: if (nCyclePalettes[ScanLine] > 0)
212: {
213: /* In case the ST uses a move.l or a movem.l to update colors, we need
214: * to add at least 4 cycles between each color: */
215: if ((pTmpCyclePalette-1)->LineCycles >= nHorPos)
216: nHorPos = (pTmpCyclePalette-1)->LineCycles + 4;
217:
218: if ( nHorPos >= nCyclesPerLine ) /* end of line reached, continue on the next line */
219: {
220: ScanLine++;
221: pTmpCyclePalette = &CyclePalettes[ (ScanLine*MAX_CYCLEPALETTES_PERLINE) + nCyclePalettes[ScanLine] ];
222: nHorPos = nCyclePalettes[ScanLine] * 4; /* 4 cycles per access */
223: }
224: }
225:
226: /* Store palette access */
227: pTmpCyclePalette->LineCycles = nHorPos; /* Cycles into scanline */
228: pTmpCyclePalette->Colour = CycleColour; /* Store ST/STe color RGB */
229: pTmpCyclePalette->Index = CycleColourIndex; /* And index (0...15) */
230:
1.1.1.14 root 231: if ( 0 && LOG_TRACE_LEVEL(TRACE_VIDEO_COLOR))
1.1.1.10 root 232: {
1.1.1.14 root 233: int FrameCycles, HblCounterVideo, LineCycles;
234:
235: Video_GetPosition ( &FrameCycles , &HblCounterVideo , &LineCycles );
236: LOG_TRACE_PRINT("spec store col line %d cyc=%d col=%x idx=%d video_cyc=%d %d@%d pc=%x instr_cyc=%d\n",
237: ScanLine, nHorPos, CycleColour, CycleColourIndex, FrameCycles,
238: LineCycles, HblCounterVideo, M68000_GetPC(), CurrentInstrCycles);
1.1.1.10 root 239: }
240:
241: /* Increment count (this can never overflow as you cannot write to the palette more than 'MAX_CYCLEPALETTES_PERLINE-1' times per scanline) */
242: nCyclePalettes[ScanLine]++;
243:
244: /* Check if program wrote to palette registers multiple times on a frame. */
245: /* If so it must be using a spec512 image or some kind of color cycling. */
246: nPalettesAccesses++;
247: if (nPalettesAccesses >= ConfigureParams.Screen.nSpec512Threshold)
248: {
1.1.1.14 root 249: bIsSpec512Display = true;
1.1.1.10 root 250: }
1.1 root 251: }
252:
1.1.1.2 root 253:
254: /*-----------------------------------------------------------------------*/
1.1.1.10 root 255: /**
256: * Begin palette calculation for Spectrum 512 style images,
257: */
1.1 root 258: void Spec512_StartFrame(void)
259: {
1.1.1.10 root 260: int i;
1.1 root 261:
1.1.1.10 root 262: /* Set so screen gets full-update when returns from Spectrum 512 display */
263: Screen_SetFullUpdate();
1.1 root 264:
1.1.1.10 root 265: /* Set terminators on each line, so when scan during conversion we know when to stop */
266: for (i = 0; i < (nScanlinesPerFrame+1); i++)
267: {
268: pCyclePalette = &CyclePalettes[ (i*MAX_CYCLEPALETTES_PERLINE) + nCyclePalettes[i] ];
269: pCyclePalette->LineCycles = -1; /* Term */
270: }
271:
1.1.1.12 root 272: /* Copy first line palette, kept in 'HBLPalettes' and store to 'STRGBPalette' */
273: for (i = 0; i < 16; i++)
274: {
1.1.1.4 root 275: #if SDL_BYTEORDER == SDL_BIG_ENDIAN
1.1.1.12 root 276: STRGBPalette[STRGBPalEndianTable[i]] = ST2RGB[pHBLPalettes[i]];
1.1.1.4 root 277: #else
1.1.1.12 root 278: STRGBPalette[i] = ST2RGB[pHBLPalettes[i]];
1.1.1.4 root 279: #endif
1.1.1.12 root 280: }
1.1 root 281:
1.1.1.10 root 282: /* Ready for first call to 'Spec512_ScanLine' */
283: nScanLine = 0;
284: if (OverscanMode & OVERSCANMODE_TOP)
285: nScanLine += OVERSCAN_TOP;
286:
287: /* Skip to first line(where start to draw screen from) */
288: for (i = 0; i < (STScreenStartHorizLine+(nStartHBL-OVERSCAN_TOP)); i++)
289: Spec512_ScanWholeLine();
1.1 root 290: }
291:
1.1.1.2 root 292:
293: /*-----------------------------------------------------------------------*/
1.1.1.10 root 294: /**
295: * Scan whole line and build up palette - need to do this so when get to screen line we have
296: * the correct 16 colours set
297: */
1.1 root 298: void Spec512_ScanWholeLine(void)
299: {
1.1.1.10 root 300: /* Store pointer to line of palette cycle writes */
301: pCyclePalette = &CyclePalettes[nScanLine*MAX_CYCLEPALETTES_PERLINE];
302: /* Ready for next scan line */
303: nScanLine++;
304:
305: /* Update palette entries until we reach start of displayed screen */
306: ScanLineCycleCount = 0;
307: Spec512_EndScanLine(); /* Read whole line of palettes and update 'STRGBPalette' */
1.1 root 308: }
309:
1.1.1.2 root 310:
311: /*-----------------------------------------------------------------------*/
1.1.1.10 root 312: /**
313: * Build up palette for this scan line and store in 'ScanLinePalettes'
314: */
1.1 root 315: void Spec512_StartScanLine(void)
316: {
1.1.1.10 root 317: int i;
318: int LineStartCycle;
1.1 root 319:
1.1.1.10 root 320: /* Store pointer to line of palette cycle writes */
321: pCyclePalette = &CyclePalettes[nScanLine*MAX_CYCLEPALETTES_PERLINE];
322: /* Ready for next scan line */
323: nScanLine++;
324:
325: if ( nScanlinesPerFrame == SCANLINES_PER_FRAME_50HZ )
326: LineStartCycle = LINE_START_CYCLE_50; /* The screen was 50 Hz */
327: else
328: LineStartCycle = LINE_START_CYCLE_60; /* The screen was 60 Hz */
329:
330: /* Update palette entries until we reach start of displayed screen */
331: ScanLineCycleCount = 0;
332: // for(i=0; i<((SCREEN_START_CYCLE-16)/4); i++) /* This '16' is as we've already added in the 'move' instruction timing */
1.1.1.13 root 333: #ifdef OLD_CYC_PAL
1.1.1.10 root 334: for (i=0; i<((LineStartCycle-SCREENBYTES_LEFT*2)/4 + 6); i++) /* [NP] '6' is required to align pixels and colors */
1.1.1.13 root 335: #else
336: for (i=0; i<((LineStartCycle-SCREENBYTES_LEFT*2)/4 + 7); i++) /* [NP] '7' is required to align pixels and colors */
337: #endif
1.1.1.10 root 338: Spec512_UpdatePaletteSpan(); /* Update palette for this 4-cycle period */
339:
340: /* And skip for left border is not using overscan display to user */
341: for (i=0; i<(STScreenLeftSkipBytes/2); i++) /* Eg, 16 bytes = 32 pixels or 8 palette periods */
342: Spec512_UpdatePaletteSpan();
1.1 root 343: }
344:
1.1.1.2 root 345:
346: /*-----------------------------------------------------------------------*/
1.1.1.10 root 347: /**
348: * Run to end of scan line looking up palettes so 'STRGBPalette' is up-to-date
349: */
1.1 root 350: void Spec512_EndScanLine(void)
351: {
1.1.1.10 root 352: /* Continue to reads palette until complete so have correct version for next line */
353: while (ScanLineCycleCount < nCyclesPerLine)
354: Spec512_UpdatePaletteSpan();
1.1 root 355: }
356:
1.1.1.2 root 357:
358: /*-----------------------------------------------------------------------*/
1.1.1.10 root 359: /**
360: * Update palette for 4-pixels span, storing to 'STRGBPalette'
361: */
1.1 root 362: void Spec512_UpdatePaletteSpan(void)
363: {
1.1.1.10 root 364: if (pCyclePalette->LineCycles == ScanLineCycleCount)
365: {
366: /* Need to update palette with new entry */
1.1.1.4 root 367: #if SDL_BYTEORDER == SDL_BIG_ENDIAN
1.1.1.10 root 368: STRGBPalette[STRGBPalEndianTable[pCyclePalette->Index]] = ST2RGB[pCyclePalette->Colour];
1.1.1.4 root 369: #else
1.1.1.10 root 370: STRGBPalette[pCyclePalette->Index] = ST2RGB[pCyclePalette->Colour];
1.1.1.16 root 371: //fprintf ( stderr , "upd spec cyc %d %x %x\n" , ScanLineCycleCount , pCyclePalette->Index , pCyclePalette->Colour );
1.1.1.4 root 372: #endif
1.1.1.10 root 373: pCyclePalette += 1;
374: }
375: ScanLineCycleCount += 4; /* Next 4 cycles */
1.1 root 376: }
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