File: ppu.h

package info (click to toggle)
snes9x 1.26-1
  • links: PTS
  • area: non-free
  • in suites: potato
  • size: 2,712 kB
  • ctags: 9,605
  • sloc: cpp: 40,776; asm: 27,081; ansic: 6,572; makefile: 314
file content (549 lines) | stat: -rw-r--r-- 14,608 bytes parent folder | download
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
/*
 * Snes9x - Portable Super Nintendo Entertainment System (TM) emulator.
 *
 * (c) Copyright 1996, 1997, 1998, 1999 Gary Henderson (gary@daniver.demon.co.uk) and
 *                                      Jerremy Koot (jkoot@snes9x.com)
 *
 * Super FX C emulator code 
 * (c) Copyright 1997, 1998, 1999 Ivar (Ivar@snes9x.com) and
 *                                Gary Henderson.
 * Super FX assembler emulator code (c) Copyright 1998 zsKnight and _Demo_.
 *
 * DSP1 emulator code (c) Copyright 1998 Ivar, _Demo_ and Gary Henderson.
 * DOS port code contains the works of other authors. See headers in
 * individual files.
 *
 * Snes9x homepage: www.snes9x.com
 *
 * Permission to use, copy, modify and distribute Snes9x in both binary and
 * source form, for non-commercial purposes, is hereby granted without fee,
 * providing that this license information and copyright notice appear with
 * all copies and any derived work.
 *
 * This software is provided 'as-is', without any express or implied
 * warranty. In no event shall the authors be held liable for any damages
 * arising from the use of this software.
 *
 * Snes9x is freeware for PERSONAL USE only. Commercial users should
 * seek permission of the copyright holders first. Commercial use includes
 * charging money for Snes9x or software derived from Snes9x.
 *
 * The copyright holders request that bug fixes and improvements to the code
 * should be forwarded to them so everyone can benefit from the modifications
 * in future versions.
 *
 * Super NES and Super Nintendo Entertainment System are trademarks of
 * Nintendo Co., Limited and its subsidiary companies.
 */

#ifndef _PPU_H_
#define _PPU_H_

#include "gfx.h"
#include "memmap.h"

#define FIRST_VISIBLE_LINE 1

extern uint8 GetBank;
extern uint16 SignExtend [2];

#define TILE_2BIT 0
#define TILE_4BIT 1
#define TILE_8BIT 2

#define MAX_2BIT_TILES 4096
#define MAX_4BIT_TILES 2048
#define MAX_8BIT_TILES 1024

#define PPU_H_BEAM_IRQ_SOURCE	(1 << 0)
#define PPU_V_BEAM_IRQ_SOURCE	(1 << 1)
#define GSU_IRQ_SOURCE		(1 << 2)
#define SA1_IRQ_SOURCE		(1 << 7)
#define SA1_DMA_IRQ_SOURCE	(1 << 5)

struct ClipData {
    uint32  Count [6];
    uint32  Left [6][6];
    uint32  Right [6][6];
};

struct InternalPPU {
    bool8  ColorsChanged;
    uint8  HDMA;
    bool8  HDMAStarted;
    uint8  MaxBrightness;
    bool8  LatchedBlanking;
    bool8  OBJChanged;
    bool8  RenderThisFrame;
    bool8  DirectColourMapsNeedRebuild;
    uint32 FrameCount;
    uint32 RenderedFramesCount;
    uint32 DisplayedRenderedFrameCount;
    int    SkippedFrames;
    int    FrameSkip;
    uint8  *TileCache [3];
    uint8  *TileCached [3];
    bool8  FirstVRAMRead;
    bool8  LatchedInterlace;
    bool8  DoubleWidthPixels;
    int    RenderedScreenHeight;
    int    RenderedScreenWidth;
    uint32 Red [256];
    uint32 Green [256];
    uint32 Blue [256];
    uint8  *XB;
    uint16 ScreenColors [256];
    int	   PreviousLine;
    int	   CurrentLine;
    int	   Controller;
    uint32 Joypads[5];
    uint32 SuperScope;
    uint32 Mouse[2];
    int    PrevMouseX[2];
    int    PrevMouseY[2];
    struct ClipData Clip [2];
};

struct SOBJ
{
    short HPos;
    uint16  VPos;
    uint16  Name;
    uint8  VFlip;
    uint8  HFlip;
    uint8  Priority;
    uint8  Palette;
    uint8  Size;
};

struct SPPU {
    uint8  BGMode;
    uint8  BG3Priority;
    uint8  Brightness;

    struct {
	bool8 High;
	uint8 Increment;
	uint16 Address;
	uint16 Mask1;
	uint16 FullGraphicCount;
	uint16 Shift;
    } VMA;

    struct {
	uint16 SCBase;
	uint16 VOffset;
	uint16 HOffset;
	uint8 BGSize;
	uint16 NameBase;
	uint16 SCSize;
    } BG [4];

    bool8 CGFLIP;
    uint16 CGDATA [256]; 
    uint8 FirstSprite;
    uint8 LastSprite;
    struct SOBJ OBJ [128];
    uint8 OAMPriorityRotation;
    uint16 OAMAddr;

    uint8 OAMFlip;
    uint16 OAMTileAddress;
    uint16 IRQVBeamPos;
    uint16 IRQHBeamPos;
    uint16 VBeamPosLatched;
    uint16 HBeamPosLatched;

    uint8 HBeamFlip;
    uint8 VBeamFlip;
    uint8 HVBeamCounterLatched;

    short MatrixA;
    short MatrixB;
    short MatrixC;
    short MatrixD;
    short CentreX;
    short CentreY;
    uint8  Joypad1ButtonReadPos;
    uint8  Joypad2ButtonReadPos;

    uint8  CGADD;
    uint8  FixedColourRed;
    uint8  FixedColourGreen;
    uint8  FixedColourBlue;
    uint16  SavedOAMAddr;
    uint16  ScreenHeight;
    uint32 WRAM;
    uint8  BG_Forced;
    bool8  ForcedBlanking;
    bool8  OBJThroughMain;
    bool8  OBJThroughSub;
    uint8  OBJSizeSelect;
    uint16  OBJNameBase;
    bool8  OBJAddition;
    uint8  OAMReadFlip;
    uint8  OAMData [512 + 32];
    bool8  VTimerEnabled;
    bool8  HTimerEnabled;
    short HTimerPosition;
    uint8  Mosaic;
    bool8  BGMosaic [4];
    bool8  Mode7HFlip;
    bool8  Mode7VFlip;
    uint8  Mode7Repeat;
    uint8  Window1Left;
    uint8  Window1Right;
    uint8  Window2Left;
    uint8  Window2Right;
    uint8  ClipCounts [6];
    uint8  ClipWindowOverlapLogic [6];
    uint8  ClipWindow1Enable [6];
    uint8  ClipWindow2Enable [6];
    bool8  ClipWindow1Inside [6];
    bool8  ClipWindow2Inside [6];
    bool8  RecomputeClipWindows;
    uint8  CGFLIPRead;
    uint16 OBJNameSelect;
    bool8  Need16x8Mulitply;
    uint8  Joypad3ButtonReadPos;
    uint8  MouseSpeed[2];
};

#define CLIP_OR 0
#define CLIP_AND 1
#define CLIP_XOR 2
#define CLIP_XNOR 3

struct SDMA {
    bool8  TransferDirection;
    bool8  AAddressFixed;
    bool8  AAddressDecrement;
    uint8  TransferMode;

    uint8  ABank;
    uint16  AAddress;
    uint16  Address;
    uint8  BAddress;

    // General DMA only:
    uint16  TransferBytes;

    // H-DMA only:
    bool8  HDMAIndirectAddressing;
    uint16  IndirectAddress;
    uint8  IndirectBank;
    uint8  Repeat;
    uint8  LineCount;
    uint8  FirstLine;
};

START_EXTERN_C
void S9xUpdateScreen ();
void S9xResetPPU ();
void S9xFixColourBrightness ();
void S9xUpdateJoypads ();
void S9xProcessMouse(int which1);
void S9xSuperFXExec ();

void S9xSetPPU (uint8 Byte, uint16 Address);
uint8 S9xGetPPU (uint16 Address);
void S9xSetCPU (uint8 Byte, uint16 Address);
uint8 S9xGetCPU (uint16 Address);

extern struct SPPU PPU;
extern struct SDMA DMA [8];
extern struct InternalPPU IPPU;
END_EXTERN_C

inline uint8 REGISTER_4212()
{
    GetBank = 0;
    if (CPU.V_Counter >= PPU.ScreenHeight + FIRST_VISIBLE_LINE &&
	CPU.V_Counter < PPU.ScreenHeight + FIRST_VISIBLE_LINE + 3)
	GetBank = 1;

    GetBank |= CPU.Cycles >= Settings.HBlankStart ? 0x40 : 0;
    if (CPU.V_Counter < FIRST_VISIBLE_LINE || 
	CPU.V_Counter >= PPU.ScreenHeight + FIRST_VISIBLE_LINE)
	GetBank |= 0x80; /* XXX: 0x80 or 0xc0 ? */
    return (GetBank);
}

inline void FLUSH_REDRAW ()
{
    if (IPPU.PreviousLine != IPPU.CurrentLine)
	S9xUpdateScreen ();
}

inline void REGISTER_2104 (uint8 Byte)
{
    if (PPU.OAMAddr >= 0x110)
	return;//PPU.OAMAddr %= 0x110;
	
    if (!PPU.OAMFlip)
    {
	if (Byte != PPU.OAMData [PPU.OAMAddr << 1])
	{
	    FLUSH_REDRAW ();
	    PPU.OAMData [PPU.OAMAddr << 1] = Byte;
	    IPPU.OBJChanged = TRUE;
	    if ((PPU.OAMAddr & 0x100) == 0)
	    {
		if (!(PPU.OAMAddr & 1))
		{
		    // X position (low)
		    PPU.OBJ[PPU.OAMAddr >> 1].HPos &= 0xFF00;
		    PPU.OBJ[PPU.OAMAddr >> 1].HPos |= Byte;
		}
		else
		{
		    // Tile group
		    PPU.OBJ[PPU.OAMAddr >> 1].Name &= 0x100;
		    PPU.OBJ[PPU.OAMAddr >> 1].Name |= Byte;
		}
	    }
	    else
	    {
		// X position high bit, and sprite size (x4)
		struct SOBJ *pObj = &PPU.OBJ [(PPU.OAMAddr & 0x0F) * 8];

		pObj->HPos = (pObj->HPos & 0xFF) | SignExtend[(Byte >> 0) & 1];
		pObj++->Size = Byte & 2;
		pObj->HPos = (pObj->HPos & 0xFF) | SignExtend[(Byte >> 2) & 1];
		pObj++->Size = Byte & 8;
		pObj->HPos = (pObj->HPos & 0xFF) | SignExtend[(Byte >> 4) & 1];
		pObj++->Size = Byte & 32;
		pObj->HPos = (pObj->HPos & 0xFF) | SignExtend[(Byte >> 6) & 1];
		pObj->Size = Byte & 128;
	    }
	}
    }
    else
    {
	if (Byte != PPU.OAMData [(PPU.OAMAddr << 1) + 1])
	{
	    FLUSH_REDRAW ();
	    PPU.OAMData [(PPU.OAMAddr << 1) + 1] = Byte;
	    IPPU.OBJChanged = TRUE;
	    
	    if ((PPU.OAMAddr & 0x100) == 0)
	    {
		if (!(PPU.OAMAddr & 1))
		{
		    // Sprite Y position
		    PPU.OBJ[PPU.OAMAddr >> 1].VPos = Byte;
		}
		else
		{
		    // Tile within group, priority, h and v flip.
		    PPU.OBJ[PPU.OAMAddr >> 1].Name &= 0xFF;
		    PPU.OBJ[PPU.OAMAddr >> 1].Name |= ((uint16) (Byte & 1)) << 8;
		    PPU.OBJ[PPU.OAMAddr >> 1].Palette = (Byte >> 1) & 7;
		    PPU.OBJ[PPU.OAMAddr >> 1].Priority = (Byte >> 4) & 3;
		    PPU.OBJ[PPU.OAMAddr >> 1].HFlip = (Byte >> 6) & 1;
		    PPU.OBJ[PPU.OAMAddr >> 1].VFlip = (Byte >> 7) & 1;
		}
	    }
	    else
	    {
		// X position high bit, and sprite size (x4)
		struct SOBJ *pObj = &PPU.OBJ [((PPU.OAMAddr & 0x0F) * 8) + 4];

		pObj->HPos = (pObj->HPos & 0xFF) | SignExtend[(Byte >> 0) & 1];
		pObj++->Size = Byte & 2;
		pObj->HPos = (pObj->HPos & 0xFF) | SignExtend[(Byte >> 2) & 1];
		pObj++->Size = Byte & 8;
		pObj->HPos = (pObj->HPos & 0xFF) | SignExtend[(Byte >> 4) & 1];
		pObj++->Size = Byte & 32;
		pObj->HPos = (pObj->HPos & 0xFF) | SignExtend[(Byte >> 6) & 1];
		pObj->Size = Byte & 128;
	    }
	}
    }

    if ((PPU.OAMFlip ^= 1) == 0)
	PPU.OAMAddr++;
    Memory.FillRAM [0x2104] = Byte;
}

inline void REGISTER_2118 (uint8 Byte)
{
    IPPU.FirstVRAMRead = TRUE;
    uint32 address;
    if (PPU.VMA.FullGraphicCount)
    {
	uint32 rem = PPU.VMA.Address & PPU.VMA.Mask1;
	address = (((PPU.VMA.Address & ~PPU.VMA.Mask1) +
			 (rem >> PPU.VMA.Shift) +
			 ((rem & (PPU.VMA.FullGraphicCount - 1)) << 3)) << 1) & 0xffff;
	Memory.VRAM [address] = Byte;
    }
    else
    {
	Memory.VRAM[address = (PPU.VMA.Address << 1) & 0xFFFF] = Byte;
    }
    IPPU.TileCached [TILE_2BIT][address >> 4] = FALSE;
    IPPU.TileCached [TILE_4BIT][address >> 5] = FALSE;
    IPPU.TileCached [TILE_8BIT][address >> 6] = FALSE;
    if (!PPU.VMA.High)
    {
#ifdef DEBUGGER
	if (Settings.TraceVRAM && !CPU.InDMA)
	{
	    printf ("VRAM write byte: $%04X (%d,%d)\n", PPU.VMA.Address,
		    Memory.FillRAM[0x2115] & 3,
		    (Memory.FillRAM [0x2115] & 0x0c) >> 2);
	}
#endif	
	PPU.VMA.Address += PPU.VMA.Increment;
    }
    Memory.FillRAM [0x2118] = Byte;
}

inline void REGISTER_2118_tile (uint8 Byte)
{
    IPPU.FirstVRAMRead = TRUE;
    uint32 address;
    uint32 rem = PPU.VMA.Address & PPU.VMA.Mask1;
    address = (((PPU.VMA.Address & ~PPU.VMA.Mask1) +
		 (rem >> PPU.VMA.Shift) +
		 ((rem & (PPU.VMA.FullGraphicCount - 1)) << 3)) << 1) & 0xffff;
    Memory.VRAM [address] = Byte;
    IPPU.TileCached [TILE_2BIT][address >> 4] = FALSE;
    IPPU.TileCached [TILE_4BIT][address >> 5] = FALSE;
    IPPU.TileCached [TILE_8BIT][address >> 6] = FALSE;
    if (!PPU.VMA.High)
	PPU.VMA.Address += PPU.VMA.Increment;
    Memory.FillRAM [0x2118] = Byte;
}

inline void REGISTER_2118_linear (uint8 Byte)
{
    IPPU.FirstVRAMRead = TRUE;
    uint32 address;
    Memory.VRAM[address = (PPU.VMA.Address << 1) & 0xFFFF] = Byte;
    IPPU.TileCached [TILE_2BIT][address >> 4] = FALSE;
    IPPU.TileCached [TILE_4BIT][address >> 5] = FALSE;
    IPPU.TileCached [TILE_8BIT][address >> 6] = FALSE;
    if (!PPU.VMA.High)
	PPU.VMA.Address += PPU.VMA.Increment;
    Memory.FillRAM [0x2118] = Byte;
}

inline void REGISTER_2119 (uint8 Byte)
{
    IPPU.FirstVRAMRead = TRUE;
    uint32 address;
    if (PPU.VMA.FullGraphicCount)
    {
	uint32 rem = PPU.VMA.Address & PPU.VMA.Mask1;
	address = ((((PPU.VMA.Address & ~PPU.VMA.Mask1) +
		    (rem >> PPU.VMA.Shift) +
		    ((rem & (PPU.VMA.FullGraphicCount - 1)) << 3)) << 1) + 1) & 0xFFFF;
	Memory.VRAM [address] = Byte;
    }
    else
    {
	Memory.VRAM[address = ((PPU.VMA.Address << 1) + 1) & 0xFFFF] = Byte;
    }
    IPPU.TileCached [TILE_2BIT][address >> 4] = FALSE;
    IPPU.TileCached [TILE_4BIT][address >> 5] = FALSE;
    IPPU.TileCached [TILE_8BIT][address >> 6] = FALSE;
    if (PPU.VMA.High)
    {
#ifdef DEBUGGER
	if (Settings.TraceVRAM && !CPU.InDMA)
	{
	    printf ("VRAM write word: $%04X (%d,%d)\n", PPU.VMA.Address,
		    Memory.FillRAM[0x2115] & 3,
		    (Memory.FillRAM [0x2115] & 0x0c) >> 2);
	}
#endif	
	PPU.VMA.Address += PPU.VMA.Increment;
    }
    Memory.FillRAM [0x2119] = Byte;
}

inline void REGISTER_2119_tile (uint8 Byte)
{
    IPPU.FirstVRAMRead = TRUE;
    uint32 rem = PPU.VMA.Address & PPU.VMA.Mask1;
    uint32 address = ((((PPU.VMA.Address & ~PPU.VMA.Mask1) +
		    (rem >> PPU.VMA.Shift) +
		    ((rem & (PPU.VMA.FullGraphicCount - 1)) << 3)) << 1) + 1) & 0xFFFF;
    Memory.VRAM [address] = Byte;
    IPPU.TileCached [TILE_2BIT][address >> 4] = FALSE;
    IPPU.TileCached [TILE_4BIT][address >> 5] = FALSE;
    IPPU.TileCached [TILE_8BIT][address >> 6] = FALSE;
    if (PPU.VMA.High)
	PPU.VMA.Address += PPU.VMA.Increment;
    Memory.FillRAM [0x2119] = Byte;
}

inline void REGISTER_2119_linear (uint8 Byte)
{
    IPPU.FirstVRAMRead = TRUE;
    uint32 address;
    Memory.VRAM[address = ((PPU.VMA.Address << 1) + 1) & 0xFFFF] = Byte;
    IPPU.TileCached [TILE_2BIT][address >> 4] = FALSE;
    IPPU.TileCached [TILE_4BIT][address >> 5] = FALSE;
    IPPU.TileCached [TILE_8BIT][address >> 6] = FALSE;
    if (PPU.VMA.High)
	PPU.VMA.Address += PPU.VMA.Increment;
    Memory.FillRAM [0x2119] = Byte;
}

inline void REGISTER_2122(uint8 Byte)
{
    // CG-RAM (palette) write

    if (PPU.CGFLIP)
    {
	if ((Byte & 0x7f) != (PPU.CGDATA[PPU.CGADD] >> 8))
	{
	    if (Settings.SixteenBit)
		FLUSH_REDRAW ();
	    PPU.CGDATA[PPU.CGADD] &= 0x00FF;
	    PPU.CGDATA[PPU.CGADD] |= (Byte & 0x7f) << 8;
	    IPPU.ColorsChanged = TRUE;
	    if (Settings.SixteenBit)
	    {
		IPPU.Blue [PPU.CGADD] = IPPU.XB [(Byte >> 2) & 0x1f];
		IPPU.Green [PPU.CGADD] = IPPU.XB [(PPU.CGDATA[PPU.CGADD] >> 5) & 0x1f];
		IPPU.ScreenColors [PPU.CGADD] = (uint16) BUILD_PIXEL (IPPU.Red [PPU.CGADD],
							     IPPU.Green [PPU.CGADD],
							     IPPU.Blue [PPU.CGADD]);
	    }
	}
	PPU.CGADD++;
    }
    else
    {
	if (Byte != (uint8) (PPU.CGDATA[PPU.CGADD] & 0xff))
	{
	    if (Settings.SixteenBit)
		FLUSH_REDRAW ();
	    PPU.CGDATA[PPU.CGADD] &= 0x7F00;
	    PPU.CGDATA[PPU.CGADD] |= Byte;
	    IPPU.ColorsChanged = TRUE;
	    if (Settings.SixteenBit)
	    {
		IPPU.Red [PPU.CGADD] = IPPU.XB [Byte & 0x1f];
		IPPU.Green [PPU.CGADD] = IPPU.XB [(PPU.CGDATA[PPU.CGADD] >> 5) & 0x1f];
		IPPU.ScreenColors [PPU.CGADD] = (uint16) BUILD_PIXEL (IPPU.Red [PPU.CGADD],
							     IPPU.Green [PPU.CGADD],
							     IPPU.Blue [PPU.CGADD]);
	    }
	}
    }
    PPU.CGFLIP ^= 1;
    Memory.FillRAM [0x2122] = Byte;
}

inline void REGISTER_2180(uint8 Byte)
{
    Memory.RAM[PPU.WRAM++] = Byte;
    PPU.WRAM &= 0x1FFFF;
    Memory.FillRAM [0x2180] = Byte;
}
#endif