src/gb/video.c (view raw)
1/* Copyright (c) 2013-2016 Jeffrey Pfau
2 *
3 * This Source Code Form is subject to the terms of the Mozilla Public
4 * License, v. 2.0. If a copy of the MPL was not distributed with this
5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
6#include <mgba/internal/gb/video.h>
7
8#include <mgba/core/sync.h>
9#include <mgba/core/thread.h>
10#include <mgba/core/cache-set.h>
11#include <mgba/internal/gb/gb.h>
12#include <mgba/internal/gb/io.h>
13#include <mgba/internal/gb/renderers/cache-set.h>
14#include <mgba/internal/gb/serialize.h>
15#include <mgba/internal/sm83/sm83.h>
16
17#include <mgba-util/memory.h>
18
19static void GBVideoDummyRendererInit(struct GBVideoRenderer* renderer, enum GBModel model, bool borders);
20static void GBVideoDummyRendererDeinit(struct GBVideoRenderer* renderer);
21static uint8_t GBVideoDummyRendererWriteVideoRegister(struct GBVideoRenderer* renderer, uint16_t address, uint8_t value);
22static void GBVideoDummyRendererWriteSGBPacket(struct GBVideoRenderer* renderer, uint8_t* data);
23static void GBVideoDummyRendererWritePalette(struct GBVideoRenderer* renderer, int index, uint16_t value);
24static void GBVideoDummyRendererWriteVRAM(struct GBVideoRenderer* renderer, uint16_t address);
25static void GBVideoDummyRendererWriteOAM(struct GBVideoRenderer* renderer, uint16_t oam);
26static void GBVideoDummyRendererDrawRange(struct GBVideoRenderer* renderer, int startX, int endX, int y, struct GBObj* obj, size_t oamMax);
27static void GBVideoDummyRendererFinishScanline(struct GBVideoRenderer* renderer, int y);
28static void GBVideoDummyRendererFinishFrame(struct GBVideoRenderer* renderer);
29static void GBVideoDummyRendererEnableSGBBorder(struct GBVideoRenderer* renderer, bool enable);
30static void GBVideoDummyRendererGetPixels(struct GBVideoRenderer* renderer, size_t* stride, const void** pixels);
31static void GBVideoDummyRendererPutPixels(struct GBVideoRenderer* renderer, size_t stride, const void* pixels);
32
33static void _cleanOAM(struct GBVideo* video, int y);
34
35static void _endMode0(struct mTiming* timing, void* context, uint32_t cyclesLate);
36static void _endMode1(struct mTiming* timing, void* context, uint32_t cyclesLate);
37static void _endMode2(struct mTiming* timing, void* context, uint32_t cyclesLate);
38static void _endMode3(struct mTiming* timing, void* context, uint32_t cyclesLate);
39static void _updateFrameCount(struct mTiming* timing, void* context, uint32_t cyclesLate);
40
41static struct GBVideoRenderer dummyRenderer = {
42 .init = GBVideoDummyRendererInit,
43 .deinit = GBVideoDummyRendererDeinit,
44 .writeVideoRegister = GBVideoDummyRendererWriteVideoRegister,
45 .writeSGBPacket = GBVideoDummyRendererWriteSGBPacket,
46 .writeVRAM = GBVideoDummyRendererWriteVRAM,
47 .writeOAM = GBVideoDummyRendererWriteOAM,
48 .writePalette = GBVideoDummyRendererWritePalette,
49 .drawRange = GBVideoDummyRendererDrawRange,
50 .finishScanline = GBVideoDummyRendererFinishScanline,
51 .finishFrame = GBVideoDummyRendererFinishFrame,
52 .enableSGBBorder = GBVideoDummyRendererEnableSGBBorder,
53 .getPixels = GBVideoDummyRendererGetPixels,
54 .putPixels = GBVideoDummyRendererPutPixels,
55};
56
57void GBVideoInit(struct GBVideo* video) {
58 video->renderer = &dummyRenderer;
59 video->renderer->cache = NULL;
60 video->renderer->sgbRenderMode = 0;
61 video->vram = anonymousMemoryMap(GB_SIZE_VRAM);
62 video->frameskip = 0;
63
64 video->modeEvent.context = video;
65 video->modeEvent.name = "GB Video Mode";
66 video->modeEvent.callback = NULL;
67 video->modeEvent.priority = 8;
68 video->frameEvent.context = video;
69 video->frameEvent.name = "GB Video Frame";
70 video->frameEvent.callback = _updateFrameCount;
71 video->frameEvent.priority = 9;
72
73 video->dmgPalette[0] = 0x7FFF;
74 video->dmgPalette[1] = 0x56B5;
75 video->dmgPalette[2] = 0x294A;
76 video->dmgPalette[3] = 0x0000;
77 video->dmgPalette[4] = 0x7FFF;
78 video->dmgPalette[5] = 0x56B5;
79 video->dmgPalette[6] = 0x294A;
80 video->dmgPalette[7] = 0x0000;
81 video->dmgPalette[8] = 0x7FFF;
82 video->dmgPalette[9] = 0x56B5;
83 video->dmgPalette[10] = 0x294A;
84 video->dmgPalette[11] = 0x0000;
85
86 video->sgbBorders = true;
87
88 video->renderer->sgbCharRam = NULL;
89 video->renderer->sgbMapRam = NULL;
90 video->renderer->sgbPalRam = NULL;
91 video->renderer->sgbAttributes = NULL;
92 video->renderer->sgbAttributeFiles = NULL;
93}
94
95void GBVideoReset(struct GBVideo* video) {
96 video->ly = 0;
97 video->x = 0;
98 video->mode = 1;
99 video->stat = 1;
100
101 video->frameCounter = 0;
102 video->frameskipCounter = 0;
103
104 GBVideoSwitchBank(video, 0);
105 video->renderer->vram = video->vram;
106 memset(&video->oam, 0, sizeof(video->oam));
107 video->renderer->oam = &video->oam;
108 memset(&video->palette, 0, sizeof(video->palette));
109
110 if (video->p->model & GB_MODEL_SGB) {
111 video->renderer->sgbCharRam = anonymousMemoryMap(SGB_SIZE_CHAR_RAM);
112 video->renderer->sgbMapRam = anonymousMemoryMap(SGB_SIZE_MAP_RAM);
113 video->renderer->sgbPalRam = anonymousMemoryMap(SGB_SIZE_PAL_RAM);
114 video->renderer->sgbAttributeFiles = anonymousMemoryMap(SGB_SIZE_ATF_RAM);
115 video->renderer->sgbAttributes = malloc(90 * 45);
116 memset(video->renderer->sgbAttributes, 0, 90 * 45);
117 video->sgbCommandHeader = 0;
118 video->sgbBufferIndex = 0;
119 }
120
121 video->palette[0] = video->dmgPalette[0];
122 video->palette[1] = video->dmgPalette[1];
123 video->palette[2] = video->dmgPalette[2];
124 video->palette[3] = video->dmgPalette[3];
125 video->palette[8 * 4 + 0] = video->dmgPalette[4];
126 video->palette[8 * 4 + 1] = video->dmgPalette[5];
127 video->palette[8 * 4 + 2] = video->dmgPalette[6];
128 video->palette[8 * 4 + 3] = video->dmgPalette[7];
129 video->palette[9 * 4 + 0] = video->dmgPalette[8];
130 video->palette[9 * 4 + 1] = video->dmgPalette[9];
131 video->palette[9 * 4 + 2] = video->dmgPalette[10];
132 video->palette[9 * 4 + 3] = video->dmgPalette[11];
133
134 video->renderer->deinit(video->renderer);
135 video->renderer->init(video->renderer, video->p->model, video->sgbBorders);
136
137 video->renderer->writePalette(video->renderer, 0, video->palette[0]);
138 video->renderer->writePalette(video->renderer, 1, video->palette[1]);
139 video->renderer->writePalette(video->renderer, 2, video->palette[2]);
140 video->renderer->writePalette(video->renderer, 3, video->palette[3]);
141 video->renderer->writePalette(video->renderer, 8 * 4 + 0, video->palette[8 * 4 + 0]);
142 video->renderer->writePalette(video->renderer, 8 * 4 + 1, video->palette[8 * 4 + 1]);
143 video->renderer->writePalette(video->renderer, 8 * 4 + 2, video->palette[8 * 4 + 2]);
144 video->renderer->writePalette(video->renderer, 8 * 4 + 3, video->palette[8 * 4 + 3]);
145 video->renderer->writePalette(video->renderer, 9 * 4 + 0, video->palette[9 * 4 + 0]);
146 video->renderer->writePalette(video->renderer, 9 * 4 + 1, video->palette[9 * 4 + 1]);
147 video->renderer->writePalette(video->renderer, 9 * 4 + 2, video->palette[9 * 4 + 2]);
148 video->renderer->writePalette(video->renderer, 9 * 4 + 3, video->palette[9 * 4 + 3]);
149}
150
151void GBVideoDeinit(struct GBVideo* video) {
152 video->renderer->deinit(video->renderer);
153 mappedMemoryFree(video->vram, GB_SIZE_VRAM);
154 if (video->renderer->sgbCharRam) {
155 mappedMemoryFree(video->renderer->sgbCharRam, SGB_SIZE_CHAR_RAM);
156 video->renderer->sgbCharRam = NULL;
157 }
158 if (video->renderer->sgbMapRam) {
159 mappedMemoryFree(video->renderer->sgbMapRam, SGB_SIZE_MAP_RAM);
160 video->renderer->sgbMapRam = NULL;
161 }
162 if (video->renderer->sgbPalRam) {
163 mappedMemoryFree(video->renderer->sgbPalRam, SGB_SIZE_PAL_RAM);
164 video->renderer->sgbPalRam = NULL;
165 }
166 if (video->renderer->sgbAttributeFiles) {
167 mappedMemoryFree(video->renderer->sgbAttributeFiles, SGB_SIZE_ATF_RAM);
168 video->renderer->sgbAttributeFiles = NULL;
169 }
170 if (video->renderer->sgbAttributes) {
171 free(video->renderer->sgbAttributes);
172 video->renderer->sgbAttributes = NULL;
173 }
174}
175
176void GBVideoAssociateRenderer(struct GBVideo* video, struct GBVideoRenderer* renderer) {
177 video->renderer->deinit(video->renderer);
178 renderer->cache = video->renderer->cache;
179 renderer->sgbRenderMode = video->renderer->sgbRenderMode;
180 renderer->sgbCharRam = video->renderer->sgbCharRam;
181 renderer->sgbMapRam = video->renderer->sgbMapRam;
182 renderer->sgbPalRam = video->renderer->sgbPalRam;
183 renderer->sgbAttributeFiles = video->renderer->sgbAttributeFiles;
184 renderer->sgbAttributes = video->renderer->sgbAttributes;
185 video->renderer = renderer;
186 renderer->vram = video->vram;
187 video->renderer->init(video->renderer, video->p->model, video->sgbBorders);
188}
189
190static bool _statIRQAsserted(GBRegisterSTAT stat) {
191 // TODO: variable for the IRQ line value?
192 if (GBRegisterSTATIsLYCIRQ(stat) && GBRegisterSTATIsLYC(stat)) {
193 return true;
194 }
195 switch (GBRegisterSTATGetMode(stat)) {
196 case 0:
197 if (GBRegisterSTATIsHblankIRQ(stat)) {
198 return true;
199 }
200 break;
201 case 1:
202 if (GBRegisterSTATIsVblankIRQ(stat)) {
203 return true;
204 }
205 break;
206 case 2:
207 if (GBRegisterSTATIsOAMIRQ(stat)) {
208 return true;
209 }
210 break;
211 case 3:
212 break;
213 }
214 return false;
215}
216
217void GBVideoSkipBIOS(struct GBVideo* video) {
218 video->mode = 1;
219 video->modeEvent.callback = _endMode1;
220
221 int32_t next;
222 if (video->p->model == GB_MODEL_CGB) {
223 video->ly = GB_VIDEO_VERTICAL_PIXELS;
224 video->p->memory.io[REG_LY] = video->ly;
225 video->stat = GBRegisterSTATClearLYC(video->stat);
226 next = 20;
227 } else {
228 video->ly = GB_VIDEO_VERTICAL_TOTAL_PIXELS;
229 video->p->memory.io[REG_LY] = 0;
230 next = 56;
231 }
232 video->stat = GBRegisterSTATSetMode(video->stat, video->mode);
233
234 video->p->memory.io[REG_IF] |= (1 << GB_IRQ_VBLANK);
235 GBUpdateIRQs(video->p);
236 video->p->memory.io[REG_STAT] = video->stat;
237 mTimingDeschedule(&video->p->timing, &video->modeEvent);
238 mTimingSchedule(&video->p->timing, &video->modeEvent, next);
239}
240
241void _endMode0(struct mTiming* timing, void* context, uint32_t cyclesLate) {
242 struct GBVideo* video = context;
243 if (video->frameskipCounter <= 0) {
244 video->renderer->finishScanline(video->renderer, video->ly);
245 }
246 int lyc = video->p->memory.io[REG_LYC];
247 int32_t next;
248 ++video->ly;
249 video->p->memory.io[REG_LY] = video->ly;
250 GBRegisterSTAT oldStat = video->stat;
251 if (video->ly < GB_VIDEO_VERTICAL_PIXELS) {
252 next = GB_VIDEO_MODE_2_LENGTH;
253 video->mode = 2;
254 video->modeEvent.callback = _endMode2;
255 } else {
256 next = GB_VIDEO_HORIZONTAL_LENGTH;
257 video->mode = 1;
258 video->modeEvent.callback = _endMode1;
259
260 mTimingDeschedule(&video->p->timing, &video->frameEvent);
261 mTimingSchedule(&video->p->timing, &video->frameEvent, -cyclesLate);
262
263 if (!_statIRQAsserted(oldStat) && GBRegisterSTATIsOAMIRQ(video->stat)) {
264 video->p->memory.io[REG_IF] |= (1 << GB_IRQ_LCDSTAT);
265 }
266 video->p->memory.io[REG_IF] |= (1 << GB_IRQ_VBLANK);
267 }
268 video->stat = GBRegisterSTATSetMode(video->stat, video->mode);
269 if (!_statIRQAsserted(oldStat) && _statIRQAsserted(video->stat)) {
270 video->p->memory.io[REG_IF] |= (1 << GB_IRQ_LCDSTAT);
271 }
272
273 // LYC stat is delayed 1 T-cycle
274 oldStat = video->stat;
275 video->stat = GBRegisterSTATSetLYC(video->stat, lyc == video->ly);
276 if (!_statIRQAsserted(oldStat) && _statIRQAsserted(video->stat)) {
277 video->p->memory.io[REG_IF] |= (1 << GB_IRQ_LCDSTAT);
278 }
279
280 GBUpdateIRQs(video->p);
281 video->p->memory.io[REG_STAT] = video->stat;
282 mTimingSchedule(timing, &video->modeEvent, (next << video->p->doubleSpeed) - cyclesLate);
283}
284
285void _endMode1(struct mTiming* timing, void* context, uint32_t cyclesLate) {
286 struct GBVideo* video = context;
287 if (!GBRegisterLCDCIsEnable(video->p->memory.io[REG_LCDC])) {
288 return;
289 }
290 int lyc = video->p->memory.io[REG_LYC];
291 // TODO: One M-cycle delay
292 ++video->ly;
293 int32_t next;
294 if (video->ly == GB_VIDEO_VERTICAL_TOTAL_PIXELS + 1) {
295 video->ly = 0;
296 video->p->memory.io[REG_LY] = video->ly;
297 next = GB_VIDEO_MODE_2_LENGTH;
298 video->mode = 2;
299 video->modeEvent.callback = _endMode2;
300 } else if (video->ly == GB_VIDEO_VERTICAL_TOTAL_PIXELS) {
301 video->p->memory.io[REG_LY] = 0;
302 next = GB_VIDEO_HORIZONTAL_LENGTH - 8;
303 } else if (video->ly == GB_VIDEO_VERTICAL_TOTAL_PIXELS - 1) {
304 video->p->memory.io[REG_LY] = video->ly;
305 next = 8;
306 } else {
307 video->p->memory.io[REG_LY] = video->ly;
308 next = GB_VIDEO_HORIZONTAL_LENGTH;
309 }
310
311 GBRegisterSTAT oldStat = video->stat;
312 video->stat = GBRegisterSTATSetMode(video->stat, video->mode);
313 video->stat = GBRegisterSTATSetLYC(video->stat, lyc == video->p->memory.io[REG_LY]);
314 if (!_statIRQAsserted(oldStat) && _statIRQAsserted(video->stat)) {
315 video->p->memory.io[REG_IF] |= (1 << GB_IRQ_LCDSTAT);
316 GBUpdateIRQs(video->p);
317 }
318 video->p->memory.io[REG_STAT] = video->stat;
319 mTimingSchedule(timing, &video->modeEvent, (next << video->p->doubleSpeed) - cyclesLate);
320}
321
322void _endMode2(struct mTiming* timing, void* context, uint32_t cyclesLate) {
323 struct GBVideo* video = context;
324 _cleanOAM(video, video->ly);
325 video->x = -(video->p->memory.io[REG_SCX] & 7);
326 video->dotClock = mTimingCurrentTime(timing) - cyclesLate + 5 - (video->x << video->p->doubleSpeed);
327 int32_t next = GB_VIDEO_MODE_3_LENGTH_BASE + video->objMax * 6 - video->x;
328 video->mode = 3;
329 video->modeEvent.callback = _endMode3;
330 GBRegisterSTAT oldStat = video->stat;
331 video->stat = GBRegisterSTATSetMode(video->stat, video->mode);
332 if (!_statIRQAsserted(oldStat) && _statIRQAsserted(video->stat)) {
333 video->p->memory.io[REG_IF] |= (1 << GB_IRQ_LCDSTAT);
334 GBUpdateIRQs(video->p);
335 }
336 video->p->memory.io[REG_STAT] = video->stat;
337 mTimingSchedule(timing, &video->modeEvent, (next << video->p->doubleSpeed) - cyclesLate);
338}
339
340void _endMode3(struct mTiming* timing, void* context, uint32_t cyclesLate) {
341 struct GBVideo* video = context;
342 GBVideoProcessDots(video, cyclesLate);
343 if (video->ly < GB_VIDEO_VERTICAL_PIXELS && video->p->memory.isHdma && video->p->memory.io[REG_HDMA5] != 0xFF) {
344 video->p->memory.hdmaRemaining = 0x10;
345 video->p->cpuBlocked = true;
346 mTimingDeschedule(timing, &video->p->memory.hdmaEvent);
347 mTimingSchedule(timing, &video->p->memory.hdmaEvent, 0);
348 }
349 video->mode = 0;
350 video->modeEvent.callback = _endMode0;
351 GBRegisterSTAT oldStat = video->stat;
352 video->stat = GBRegisterSTATSetMode(video->stat, video->mode);
353 if (!_statIRQAsserted(oldStat) && _statIRQAsserted(video->stat)) {
354 video->p->memory.io[REG_IF] |= (1 << GB_IRQ_LCDSTAT);
355 GBUpdateIRQs(video->p);
356 }
357 video->p->memory.io[REG_STAT] = video->stat;
358 // TODO: Cache SCX & 7 in case it changes
359 int32_t next = GB_VIDEO_MODE_0_LENGTH_BASE - video->objMax * 6 - (video->p->memory.io[REG_SCX] & 7);
360 mTimingSchedule(timing, &video->modeEvent, (next << video->p->doubleSpeed) - cyclesLate);
361}
362
363void _updateFrameCount(struct mTiming* timing, void* context, uint32_t cyclesLate) {
364 UNUSED(cyclesLate);
365 struct GBVideo* video = context;
366 if (video->p->cpu->executionState != SM83_CORE_FETCH) {
367 mTimingSchedule(timing, &video->frameEvent, 4 - ((video->p->cpu->executionState + 1) & 3));
368 return;
369 }
370 if (!GBRegisterLCDCIsEnable(video->p->memory.io[REG_LCDC])) {
371 mTimingSchedule(timing, &video->frameEvent, GB_VIDEO_TOTAL_LENGTH);
372 }
373
374 --video->frameskipCounter;
375 if (video->frameskipCounter < 0) {
376 video->renderer->finishFrame(video->renderer);
377 video->frameskipCounter = video->frameskip;
378 }
379 GBFrameEnded(video->p);
380 mCoreSyncPostFrame(video->p->sync);
381 ++video->frameCounter;
382 video->p->earlyExit = true;
383
384 GBFrameStarted(video->p);
385}
386
387static void _cleanOAM(struct GBVideo* video, int y) {
388 // TODO: GBC differences
389 // TODO: Optimize
390 video->objMax = 0;
391 int spriteHeight = 8;
392 if (GBRegisterLCDCIsObjSize(video->p->memory.io[REG_LCDC])) {
393 spriteHeight = 16;
394 }
395 int o = 0;
396 int i;
397 for (i = 0; i < 40; ++i) {
398 uint8_t oy = video->oam.obj[i].y;
399 if (y < oy - 16 || y >= oy - 16 + spriteHeight) {
400 continue;
401 }
402 // TODO: Sort
403 video->objThisLine[o] = video->oam.obj[i];
404 ++o;
405 if (o == 10) {
406 break;
407 }
408 }
409 video->objMax = o;
410}
411
412void GBVideoProcessDots(struct GBVideo* video, uint32_t cyclesLate) {
413 if (video->mode != 3) {
414 return;
415 }
416 int oldX = video->x;
417 video->x = (int32_t) (mTimingCurrentTime(&video->p->timing) - cyclesLate - video->dotClock) >> video->p->doubleSpeed;
418 if (video->x > GB_VIDEO_HORIZONTAL_PIXELS) {
419 video->x = GB_VIDEO_HORIZONTAL_PIXELS;
420 } else if (video->x < 0) {
421 return;
422 }
423 if (oldX < 0) {
424 oldX = 0;
425 }
426 if (video->frameskipCounter <= 0) {
427 video->renderer->drawRange(video->renderer, oldX, video->x, video->ly, video->objThisLine, video->objMax);
428 }
429}
430
431void GBVideoWriteLCDC(struct GBVideo* video, GBRegisterLCDC value) {
432 if (!GBRegisterLCDCIsEnable(video->p->memory.io[REG_LCDC]) && GBRegisterLCDCIsEnable(value)) {
433 video->mode = 2;
434 video->modeEvent.callback = _endMode2;
435 int32_t next = GB_VIDEO_MODE_2_LENGTH - 5; // TODO: Why is this fudge factor needed? Might be related to T-cycles for load/store differing
436 mTimingDeschedule(&video->p->timing, &video->modeEvent);
437 mTimingSchedule(&video->p->timing, &video->modeEvent, next << video->p->doubleSpeed);
438
439 video->ly = 0;
440 video->p->memory.io[REG_LY] = 0;
441 GBRegisterSTAT oldStat = video->stat;
442 video->stat = GBRegisterSTATSetMode(video->stat, 0);
443 video->stat = GBRegisterSTATSetLYC(video->stat, video->ly == video->p->memory.io[REG_LYC]);
444 if (!_statIRQAsserted(oldStat) && _statIRQAsserted(video->stat)) {
445 video->p->memory.io[REG_IF] |= (1 << GB_IRQ_LCDSTAT);
446 GBUpdateIRQs(video->p);
447 }
448 video->p->memory.io[REG_STAT] = video->stat;
449 video->renderer->writePalette(video->renderer, 0, video->palette[0]);
450
451 mTimingDeschedule(&video->p->timing, &video->frameEvent);
452 }
453 if (GBRegisterLCDCIsEnable(video->p->memory.io[REG_LCDC]) && !GBRegisterLCDCIsEnable(value)) {
454 // TODO: Fix serialization; this gets internal and visible modes out of sync
455 video->mode = 0;
456 video->stat = GBRegisterSTATSetMode(video->stat, 0);
457 video->p->memory.io[REG_STAT] = video->stat;
458 video->ly = 0;
459 video->p->memory.io[REG_LY] = 0;
460 video->renderer->writePalette(video->renderer, 0, video->dmgPalette[0]);
461
462 mTimingDeschedule(&video->p->timing, &video->modeEvent);
463 mTimingDeschedule(&video->p->timing, &video->frameEvent);
464 mTimingSchedule(&video->p->timing, &video->frameEvent, GB_VIDEO_TOTAL_LENGTH);
465 }
466 video->p->memory.io[REG_STAT] = video->stat;
467}
468
469void GBVideoWriteSTAT(struct GBVideo* video, GBRegisterSTAT value) {
470 GBRegisterSTAT oldStat = video->stat;
471 video->stat = (video->stat & 0x7) | (value & 0x78);
472 if (!GBRegisterLCDCIsEnable(video->p->memory.io[REG_LCDC]) || video->p->model >= GB_MODEL_CGB) {
473 return;
474 }
475 if (!_statIRQAsserted(oldStat) && video->mode < 3) {
476 // TODO: variable for the IRQ line value?
477 video->p->memory.io[REG_IF] |= (1 << GB_IRQ_LCDSTAT);
478 GBUpdateIRQs(video->p);
479 }
480}
481
482void GBVideoWriteLYC(struct GBVideo* video, uint8_t value) {
483 GBRegisterSTAT oldStat = video->stat;
484 if (GBRegisterLCDCIsEnable(video->p->memory.io[REG_LCDC])) {
485 video->stat = GBRegisterSTATSetLYC(video->stat, value == video->ly);
486 if (!_statIRQAsserted(oldStat) && _statIRQAsserted(video->stat)) {
487 video->p->memory.io[REG_IF] |= (1 << GB_IRQ_LCDSTAT);
488 GBUpdateIRQs(video->p);
489 }
490 }
491 video->p->memory.io[REG_STAT] = video->stat;
492}
493
494void GBVideoWritePalette(struct GBVideo* video, uint16_t address, uint8_t value) {
495 if (video->p->model < GB_MODEL_SGB) {
496 switch (address) {
497 case REG_BGP:
498 video->palette[0] = video->dmgPalette[value & 3];
499 video->palette[1] = video->dmgPalette[(value >> 2) & 3];
500 video->palette[2] = video->dmgPalette[(value >> 4) & 3];
501 video->palette[3] = video->dmgPalette[(value >> 6) & 3];
502 video->renderer->writePalette(video->renderer, 0, video->palette[0]);
503 video->renderer->writePalette(video->renderer, 1, video->palette[1]);
504 video->renderer->writePalette(video->renderer, 2, video->palette[2]);
505 video->renderer->writePalette(video->renderer, 3, video->palette[3]);
506 break;
507 case REG_OBP0:
508 video->palette[8 * 4 + 0] = video->dmgPalette[(value & 3) + 4];
509 video->palette[8 * 4 + 1] = video->dmgPalette[((value >> 2) & 3) + 4];
510 video->palette[8 * 4 + 2] = video->dmgPalette[((value >> 4) & 3) + 4];
511 video->palette[8 * 4 + 3] = video->dmgPalette[((value >> 6) & 3) + 4];
512 video->renderer->writePalette(video->renderer, 8 * 4 + 0, video->palette[8 * 4 + 0]);
513 video->renderer->writePalette(video->renderer, 8 * 4 + 1, video->palette[8 * 4 + 1]);
514 video->renderer->writePalette(video->renderer, 8 * 4 + 2, video->palette[8 * 4 + 2]);
515 video->renderer->writePalette(video->renderer, 8 * 4 + 3, video->palette[8 * 4 + 3]);
516 break;
517 case REG_OBP1:
518 video->palette[9 * 4 + 0] = video->dmgPalette[(value & 3) + 8];
519 video->palette[9 * 4 + 1] = video->dmgPalette[((value >> 2) & 3) + 8];
520 video->palette[9 * 4 + 2] = video->dmgPalette[((value >> 4) & 3) + 8];
521 video->palette[9 * 4 + 3] = video->dmgPalette[((value >> 6) & 3) + 8];
522 video->renderer->writePalette(video->renderer, 9 * 4 + 0, video->palette[9 * 4 + 0]);
523 video->renderer->writePalette(video->renderer, 9 * 4 + 1, video->palette[9 * 4 + 1]);
524 video->renderer->writePalette(video->renderer, 9 * 4 + 2, video->palette[9 * 4 + 2]);
525 video->renderer->writePalette(video->renderer, 9 * 4 + 3, video->palette[9 * 4 + 3]);
526 break;
527 }
528 } else if (video->p->model & GB_MODEL_SGB) {
529 video->renderer->writeVideoRegister(video->renderer, address, value);
530 } else {
531 switch (address) {
532 case REG_BCPD:
533 if (video->mode != 3) {
534 if (video->bcpIndex & 1) {
535 video->palette[video->bcpIndex >> 1] &= 0x00FF;
536 video->palette[video->bcpIndex >> 1] |= value << 8;
537 } else {
538 video->palette[video->bcpIndex >> 1] &= 0xFF00;
539 video->palette[video->bcpIndex >> 1] |= value;
540 }
541 video->renderer->writePalette(video->renderer, video->bcpIndex >> 1, video->palette[video->bcpIndex >> 1]);
542 }
543 if (video->bcpIncrement) {
544 ++video->bcpIndex;
545 video->bcpIndex &= 0x3F;
546 video->p->memory.io[REG_BCPS] &= 0x80;
547 video->p->memory.io[REG_BCPS] |= video->bcpIndex;
548 }
549 video->p->memory.io[REG_BCPD] = video->palette[video->bcpIndex >> 1] >> (8 * (video->bcpIndex & 1));
550 break;
551 case REG_OCPD:
552 if (video->mode != 3) {
553 if (video->ocpIndex & 1) {
554 video->palette[8 * 4 + (video->ocpIndex >> 1)] &= 0x00FF;
555 video->palette[8 * 4 + (video->ocpIndex >> 1)] |= value << 8;
556 } else {
557 video->palette[8 * 4 + (video->ocpIndex >> 1)] &= 0xFF00;
558 video->palette[8 * 4 + (video->ocpIndex >> 1)] |= value;
559 }
560 video->renderer->writePalette(video->renderer, 8 * 4 + (video->ocpIndex >> 1), video->palette[8 * 4 + (video->ocpIndex >> 1)]);
561 }
562 if (video->ocpIncrement) {
563 ++video->ocpIndex;
564 video->ocpIndex &= 0x3F;
565 video->p->memory.io[REG_OCPS] &= 0x80;
566 video->p->memory.io[REG_OCPS] |= video->ocpIndex;
567 }
568 video->p->memory.io[REG_OCPD] = video->palette[8 * 4 + (video->ocpIndex >> 1)] >> (8 * (video->ocpIndex & 1));
569 break;
570 }
571 }
572}
573
574void GBVideoSwitchBank(struct GBVideo* video, uint8_t value) {
575 value &= 1;
576 video->vramBank = &video->vram[value * GB_SIZE_VRAM_BANK0];
577 video->vramCurrentBank = value;
578}
579
580void GBVideoSetPalette(struct GBVideo* video, unsigned index, uint32_t color) {
581 if (index >= 12) {
582 return;
583 }
584 video->dmgPalette[index] = M_RGB8_TO_RGB5(color);
585}
586
587void GBVideoDisableCGB(struct GBVideo* video) {
588 video->dmgPalette[0] = video->palette[0];
589 video->dmgPalette[1] = video->palette[1];
590 video->dmgPalette[2] = video->palette[2];
591 video->dmgPalette[3] = video->palette[3];
592 video->dmgPalette[4] = video->palette[8 * 4 + 0];
593 video->dmgPalette[5] = video->palette[8 * 4 + 1];
594 video->dmgPalette[6] = video->palette[8 * 4 + 2];
595 video->dmgPalette[7] = video->palette[8 * 4 + 3];
596 video->dmgPalette[8] = video->palette[9 * 4 + 0];
597 video->dmgPalette[9] = video->palette[9 * 4 + 1];
598 video->dmgPalette[10] = video->palette[9 * 4 + 2];
599 video->dmgPalette[11] = video->palette[9 * 4 + 3];
600 video->renderer->deinit(video->renderer);
601 video->renderer->init(video->renderer, video->p->model, video->sgbBorders);
602}
603
604void GBVideoWriteSGBPacket(struct GBVideo* video, uint8_t* data) {
605 int i;
606 if (!(video->sgbCommandHeader & 7)) {
607 video->sgbBufferIndex = 0;
608 if ((data[0] >> 3) > SGB_OBJ_TRN) {
609 video->sgbCommandHeader = 0;
610 return;
611 }
612 video->sgbCommandHeader = data[0];
613 }
614 --video->sgbCommandHeader;
615 memcpy(&video->sgbPacketBuffer[video->sgbBufferIndex << 4], data, 16);
616 ++video->sgbBufferIndex;
617 if (video->sgbCommandHeader & 7) {
618 return;
619 }
620 switch (video->sgbCommandHeader >> 3) {
621 case SGB_PAL01:
622 video->palette[0] = video->sgbPacketBuffer[1] | (video->sgbPacketBuffer[2] << 8);
623 video->palette[1] = video->sgbPacketBuffer[3] | (video->sgbPacketBuffer[4] << 8);
624 video->palette[2] = video->sgbPacketBuffer[5] | (video->sgbPacketBuffer[6] << 8);
625 video->palette[3] = video->sgbPacketBuffer[7] | (video->sgbPacketBuffer[8] << 8);
626
627 video->palette[4] = video->sgbPacketBuffer[1] | (video->sgbPacketBuffer[2] << 8);
628 video->palette[5] = video->sgbPacketBuffer[9] | (video->sgbPacketBuffer[10] << 8);
629 video->palette[6] = video->sgbPacketBuffer[11] | (video->sgbPacketBuffer[12] << 8);
630 video->palette[7] = video->sgbPacketBuffer[13] | (video->sgbPacketBuffer[14] << 8);
631
632 video->palette[8] = video->sgbPacketBuffer[1] | (video->sgbPacketBuffer[2] << 8);
633 video->palette[12] = video->sgbPacketBuffer[1] | (video->sgbPacketBuffer[2] << 8);
634
635 video->renderer->writePalette(video->renderer, 0, video->palette[0]);
636 video->renderer->writePalette(video->renderer, 1, video->palette[1]);
637 video->renderer->writePalette(video->renderer, 2, video->palette[2]);
638 video->renderer->writePalette(video->renderer, 3, video->palette[3]);
639 video->renderer->writePalette(video->renderer, 4, video->palette[4]);
640 video->renderer->writePalette(video->renderer, 5, video->palette[5]);
641 video->renderer->writePalette(video->renderer, 6, video->palette[6]);
642 video->renderer->writePalette(video->renderer, 7, video->palette[7]);
643 video->renderer->writePalette(video->renderer, 8, video->palette[8]);
644 video->renderer->writePalette(video->renderer, 12, video->palette[12]);
645 break;
646 case SGB_PAL23:
647 video->palette[9] = video->sgbPacketBuffer[3] | (video->sgbPacketBuffer[4] << 8);
648 video->palette[10] = video->sgbPacketBuffer[5] | (video->sgbPacketBuffer[6] << 8);
649 video->palette[11] = video->sgbPacketBuffer[7] | (video->sgbPacketBuffer[8] << 8);
650
651 video->palette[13] = video->sgbPacketBuffer[9] | (video->sgbPacketBuffer[10] << 8);
652 video->palette[14] = video->sgbPacketBuffer[11] | (video->sgbPacketBuffer[12] << 8);
653 video->palette[15] = video->sgbPacketBuffer[13] | (video->sgbPacketBuffer[14] << 8);
654 video->renderer->writePalette(video->renderer, 9, video->palette[9]);
655 video->renderer->writePalette(video->renderer, 10, video->palette[10]);
656 video->renderer->writePalette(video->renderer, 11, video->palette[11]);
657 video->renderer->writePalette(video->renderer, 13, video->palette[13]);
658 video->renderer->writePalette(video->renderer, 14, video->palette[14]);
659 video->renderer->writePalette(video->renderer, 15, video->palette[15]);
660 break;
661 case SGB_PAL03:
662 video->palette[0] = video->sgbPacketBuffer[1] | (video->sgbPacketBuffer[2] << 8);
663 video->palette[1] = video->sgbPacketBuffer[3] | (video->sgbPacketBuffer[4] << 8);
664 video->palette[2] = video->sgbPacketBuffer[5] | (video->sgbPacketBuffer[6] << 8);
665 video->palette[3] = video->sgbPacketBuffer[7] | (video->sgbPacketBuffer[8] << 8);
666
667 video->palette[4] = video->sgbPacketBuffer[1] | (video->sgbPacketBuffer[2] << 8);
668 video->palette[8] = video->sgbPacketBuffer[1] | (video->sgbPacketBuffer[2] << 8);
669
670 video->palette[12] = video->sgbPacketBuffer[1] | (video->sgbPacketBuffer[2] << 8);
671 video->palette[13] = video->sgbPacketBuffer[9] | (video->sgbPacketBuffer[10] << 8);
672 video->palette[14] = video->sgbPacketBuffer[11] | (video->sgbPacketBuffer[12] << 8);
673 video->palette[15] = video->sgbPacketBuffer[13] | (video->sgbPacketBuffer[14] << 8);
674 video->renderer->writePalette(video->renderer, 0, video->palette[0]);
675 video->renderer->writePalette(video->renderer, 1, video->palette[1]);
676 video->renderer->writePalette(video->renderer, 2, video->palette[2]);
677 video->renderer->writePalette(video->renderer, 3, video->palette[3]);
678 video->renderer->writePalette(video->renderer, 4, video->palette[4]);
679 video->renderer->writePalette(video->renderer, 8, video->palette[8]);
680 video->renderer->writePalette(video->renderer, 12, video->palette[12]);
681 video->renderer->writePalette(video->renderer, 13, video->palette[13]);
682 video->renderer->writePalette(video->renderer, 14, video->palette[14]);
683 video->renderer->writePalette(video->renderer, 15, video->palette[15]);
684 break;
685 case SGB_PAL12:
686 video->palette[5] = video->sgbPacketBuffer[3] | (video->sgbPacketBuffer[4] << 8);
687 video->palette[6] = video->sgbPacketBuffer[5] | (video->sgbPacketBuffer[6] << 8);
688 video->palette[7] = video->sgbPacketBuffer[7] | (video->sgbPacketBuffer[8] << 8);
689
690 video->palette[9] = video->sgbPacketBuffer[9] | (video->sgbPacketBuffer[10] << 8);
691 video->palette[10] = video->sgbPacketBuffer[11] | (video->sgbPacketBuffer[12] << 8);
692 video->palette[11] = video->sgbPacketBuffer[13] | (video->sgbPacketBuffer[14] << 8);
693 video->renderer->writePalette(video->renderer, 5, video->palette[5]);
694 video->renderer->writePalette(video->renderer, 6, video->palette[6]);
695 video->renderer->writePalette(video->renderer, 7, video->palette[7]);
696 video->renderer->writePalette(video->renderer, 9, video->palette[9]);
697 video->renderer->writePalette(video->renderer, 10, video->palette[10]);
698 video->renderer->writePalette(video->renderer, 11, video->palette[11]);
699 break;
700 case SGB_PAL_SET:
701 for (i = 0; i < 4; ++i) {
702 uint16_t entry = (video->sgbPacketBuffer[2 + (i * 2)] << 8) | video->sgbPacketBuffer[1 + (i * 2)];
703 if (entry >= 0x200) {
704 mLOG(GB, STUB, "Unimplemented SGB palette overflow: %03X", entry);
705 continue;
706 }
707 LOAD_16LE(video->palette[i * 4 + 0], entry * 8 + 0, video->renderer->sgbPalRam);
708 video->renderer->writePalette(video->renderer, i * 4 + 0, video->palette[i * 4 + 0]);
709 LOAD_16LE(video->palette[i * 4 + 1], entry * 8 + 2, video->renderer->sgbPalRam);
710 video->renderer->writePalette(video->renderer, i * 4 + 1, video->palette[i * 4 + 1]);
711 LOAD_16LE(video->palette[i * 4 + 2], entry * 8 + 4, video->renderer->sgbPalRam);
712 video->renderer->writePalette(video->renderer, i * 4 + 2, video->palette[i * 4 + 2]);
713 LOAD_16LE(video->palette[i * 4 + 3], entry * 8 + 6, video->renderer->sgbPalRam);
714 video->renderer->writePalette(video->renderer, i * 4 + 3, video->palette[i * 4 + 3]);
715 }
716 break;
717 case SGB_ATTR_BLK:
718 case SGB_ATTR_DIV:
719 case SGB_ATTR_CHR:
720 case SGB_ATTR_LIN:
721 case SGB_PAL_TRN:
722 case SGB_ATRC_EN:
723 case SGB_CHR_TRN:
724 case SGB_PCT_TRN:
725 case SGB_ATTR_TRN:
726 case SGB_ATTR_SET:
727 break;
728 case SGB_MLT_REQ:
729 if ((video->sgbPacketBuffer[1] & 0x3) == 2) { // XXX: This unmasked increment appears to be an SGB hardware bug
730 ++video->p->sgbCurrentController;
731 }
732 video->p->sgbControllers = video->sgbPacketBuffer[1] & 0x3;
733 video->p->sgbCurrentController &= video->p->sgbControllers;
734 return;
735 case SGB_MASK_EN:
736 video->renderer->sgbRenderMode = video->sgbPacketBuffer[1] & 0x3;
737 break;
738 default:
739 mLOG(GB, STUB, "Unimplemented SGB command: %02X", video->sgbPacketBuffer[0] >> 3);
740 return;
741 }
742 video->renderer->writeSGBPacket(video->renderer, video->sgbPacketBuffer);
743}
744
745static void GBVideoDummyRendererInit(struct GBVideoRenderer* renderer, enum GBModel model, bool borders) {
746 UNUSED(renderer);
747 UNUSED(model);
748 UNUSED(borders);
749 // Nothing to do
750}
751
752static void GBVideoDummyRendererDeinit(struct GBVideoRenderer* renderer) {
753 UNUSED(renderer);
754 // Nothing to do
755}
756
757static uint8_t GBVideoDummyRendererWriteVideoRegister(struct GBVideoRenderer* renderer, uint16_t address, uint8_t value) {
758 if (renderer->cache) {
759 GBVideoCacheWriteVideoRegister(renderer->cache, address, value);
760 }
761 return value;
762}
763
764static void GBVideoDummyRendererWriteSGBPacket(struct GBVideoRenderer* renderer, uint8_t* data) {
765 UNUSED(renderer);
766 UNUSED(data);
767}
768
769static void GBVideoDummyRendererWriteVRAM(struct GBVideoRenderer* renderer, uint16_t address) {
770 if (renderer->cache) {
771 mCacheSetWriteVRAM(renderer->cache, address);
772 }
773}
774
775static void GBVideoDummyRendererWriteOAM(struct GBVideoRenderer* renderer, uint16_t oam) {
776 UNUSED(renderer);
777 UNUSED(oam);
778 // Nothing to do
779}
780
781static void GBVideoDummyRendererWritePalette(struct GBVideoRenderer* renderer, int index, uint16_t value) {
782 if (renderer->cache) {
783 mCacheSetWritePalette(renderer->cache, index, mColorFrom555(value));
784 }
785}
786
787static void GBVideoDummyRendererDrawRange(struct GBVideoRenderer* renderer, int startX, int endX, int y, struct GBObj* obj, size_t oamMax) {
788 UNUSED(renderer);
789 UNUSED(endX);
790 UNUSED(startX);
791 UNUSED(y);
792 UNUSED(obj);
793 UNUSED(oamMax);
794 // Nothing to do
795}
796
797static void GBVideoDummyRendererFinishScanline(struct GBVideoRenderer* renderer, int y) {
798 UNUSED(renderer);
799 UNUSED(y);
800 // Nothing to do
801}
802
803static void GBVideoDummyRendererFinishFrame(struct GBVideoRenderer* renderer) {
804 UNUSED(renderer);
805 // Nothing to do
806}
807
808static void GBVideoDummyRendererEnableSGBBorder(struct GBVideoRenderer* renderer, bool enable) {
809 UNUSED(renderer);
810 UNUSED(enable);
811 // Nothing to do
812}
813
814static void GBVideoDummyRendererGetPixels(struct GBVideoRenderer* renderer, size_t* stride, const void** pixels) {
815 UNUSED(renderer);
816 UNUSED(stride);
817 UNUSED(pixels);
818 // Nothing to do
819}
820
821static void GBVideoDummyRendererPutPixels(struct GBVideoRenderer* renderer, size_t stride, const void* pixels) {
822 UNUSED(renderer);
823 UNUSED(stride);
824 UNUSED(pixels);
825 // Nothing to do
826}
827
828void GBVideoSerialize(const struct GBVideo* video, struct GBSerializedState* state) {
829 STORE_16LE(video->x, 0, &state->video.x);
830 STORE_16LE(video->ly, 0, &state->video.ly);
831 STORE_32LE(video->frameCounter, 0, &state->video.frameCounter);
832 STORE_32LE(video->dotClock, 0, &state->video.dotCounter);
833 state->video.vramCurrentBank = video->vramCurrentBank;
834
835 GBSerializedVideoFlags flags = 0;
836 flags = GBSerializedVideoFlagsSetBcpIncrement(flags, video->bcpIncrement);
837 flags = GBSerializedVideoFlagsSetOcpIncrement(flags, video->ocpIncrement);
838 flags = GBSerializedVideoFlagsSetMode(flags, video->mode);
839 flags = GBSerializedVideoFlagsSetNotModeEventScheduled(flags, !mTimingIsScheduled(&video->p->timing, &video->modeEvent));
840 flags = GBSerializedVideoFlagsSetNotFrameEventScheduled(flags, !mTimingIsScheduled(&video->p->timing, &video->frameEvent));
841 state->video.flags = flags;
842 STORE_16LE(video->bcpIndex, 0, &state->video.bcpIndex);
843 STORE_16LE(video->ocpIndex, 0, &state->video.ocpIndex);
844
845 size_t i;
846 for (i = 0; i < 64; ++i) {
847 STORE_16LE(video->palette[i], i * 2, state->video.palette);
848 }
849
850 STORE_32LE(video->modeEvent.when - mTimingCurrentTime(&video->p->timing), 0, &state->video.nextMode);
851 STORE_32LE(video->frameEvent.when - mTimingCurrentTime(&video->p->timing), 0, &state->video.nextFrame);
852
853 memcpy(state->vram, video->vram, GB_SIZE_VRAM);
854 memcpy(state->oam, &video->oam.raw, GB_SIZE_OAM);
855}
856
857void GBVideoDeserialize(struct GBVideo* video, const struct GBSerializedState* state) {
858 LOAD_16LE(video->x, 0, &state->video.x);
859 LOAD_16LE(video->ly, 0, &state->video.ly);
860 LOAD_32LE(video->frameCounter, 0, &state->video.frameCounter);
861 LOAD_32LE(video->dotClock, 0, &state->video.dotCounter);
862 video->vramCurrentBank = state->video.vramCurrentBank;
863
864 GBSerializedVideoFlags flags = state->video.flags;
865 video->bcpIncrement = GBSerializedVideoFlagsGetBcpIncrement(flags);
866 video->ocpIncrement = GBSerializedVideoFlagsGetOcpIncrement(flags);
867 video->mode = GBSerializedVideoFlagsGetMode(flags);
868 LOAD_16LE(video->bcpIndex, 0, &state->video.bcpIndex);
869 video->bcpIndex &= 0x3F;
870 LOAD_16LE(video->ocpIndex, 0, &state->video.ocpIndex);
871 video->ocpIndex &= 0x3F;
872
873 switch (video->mode) {
874 case 0:
875 video->modeEvent.callback = _endMode0;
876 break;
877 case 1:
878 video->modeEvent.callback = _endMode1;
879 break;
880 case 2:
881 video->modeEvent.callback = _endMode2;
882 break;
883 case 3:
884 video->modeEvent.callback = _endMode3;
885 break;
886 }
887
888 uint32_t when;
889 if (!GBSerializedVideoFlagsIsNotModeEventScheduled(flags)) {
890 LOAD_32LE(when, 0, &state->video.nextMode);
891 mTimingSchedule(&video->p->timing, &video->modeEvent, when);
892 }
893 if (!GBSerializedVideoFlagsIsNotFrameEventScheduled(flags)) {
894 LOAD_32LE(when, 0, &state->video.nextFrame);
895 mTimingSchedule(&video->p->timing, &video->frameEvent, when);
896 }
897
898 video->renderer->deinit(video->renderer);
899 video->renderer->init(video->renderer, video->p->model, video->sgbBorders);
900
901 size_t i;
902 for (i = 0; i < 64; ++i) {
903 LOAD_16LE(video->palette[i], i * 2, state->video.palette);
904 video->renderer->writePalette(video->renderer, i, video->palette[i]);
905 }
906
907 memcpy(video->vram, state->vram, GB_SIZE_VRAM);
908 memcpy(&video->oam.raw, state->oam, GB_SIZE_OAM);
909
910 _cleanOAM(video, video->ly);
911 GBVideoSwitchBank(video, video->vramCurrentBank);
912}