src/gba/serialize.c (view raw)
1/* Copyright (c) 2013-2015 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 "serialize.h"
7
8#include "gba/audio.h"
9#include "gba/io.h"
10#include "gba/supervisor/rr.h"
11#include "gba/supervisor/thread.h"
12#include "gba/video.h"
13
14#include "util/memory.h"
15#include "util/vfs.h"
16
17#include <fcntl.h>
18
19#ifdef USE_PNG
20#include "util/png-io.h"
21#include <png.h>
22#include <zlib.h>
23#endif
24
25const uint32_t GBA_SAVESTATE_MAGIC = 0x01000000;
26
27void GBASerialize(struct GBA* gba, struct GBASerializedState* state) {
28 state->versionMagic = GBA_SAVESTATE_MAGIC;
29 state->biosChecksum = gba->biosChecksum;
30 state->romCrc32 = gba->romCrc32;
31
32 if (gba->memory.rom) {
33 state->id = ((struct GBACartridge*) gba->memory.rom)->id;
34 memcpy(state->title, ((struct GBACartridge*) gba->memory.rom)->title, sizeof(state->title));
35 } else {
36 state->id = 0;
37 memset(state->title, 0, sizeof(state->title));
38 }
39
40 memcpy(state->cpu.gprs, gba->cpu->gprs, sizeof(state->cpu.gprs));
41 state->cpu.cpsr = gba->cpu->cpsr;
42 state->cpu.spsr = gba->cpu->spsr;
43 state->cpu.cycles = gba->cpu->cycles;
44 state->cpu.nextEvent = gba->cpu->nextEvent;
45 memcpy(state->cpu.bankedRegisters, gba->cpu->bankedRegisters, 6 * 7 * sizeof(int32_t));
46 memcpy(state->cpu.bankedSPSRs, gba->cpu->bankedSPSRs, 6 * sizeof(int32_t));
47
48 state->biosPrefetch = gba->memory.biosPrefetch;
49 state->cpuPrefetch[0] = gba->cpu->prefetch[0];
50 state->cpuPrefetch[1] = gba->cpu->prefetch[1];
51
52 GBAMemorySerialize(&gba->memory, state);
53 GBAIOSerialize(gba, state);
54 GBAVideoSerialize(&gba->video, state);
55 GBAAudioSerialize(&gba->audio, state);
56 GBASavedataSerialize(&gba->memory.savedata, state, false);
57
58 state->associatedStreamId = 0;
59 if (gba->rr) {
60 gba->rr->stateSaved(gba->rr, state);
61 }
62}
63
64bool GBADeserialize(struct GBA* gba, const struct GBASerializedState* state) {
65 bool error = false;
66 if (state->versionMagic != GBA_SAVESTATE_MAGIC) {
67 GBALog(gba, GBA_LOG_WARN, "Invalid or too new savestate");
68 error = true;
69 }
70 if (state->biosChecksum != gba->biosChecksum) {
71 GBALog(gba, GBA_LOG_WARN, "Savestate created using a different version of the BIOS");
72 if (state->cpu.gprs[ARM_PC] < SIZE_BIOS && state->cpu.gprs[ARM_PC] >= 0x20) {
73 error = true;
74 }
75 }
76 if (gba->memory.rom && (state->id != ((struct GBACartridge*) gba->memory.rom)->id || memcmp(state->title, ((struct GBACartridge*) gba->memory.rom)->title, sizeof(state->title)))) {
77 GBALog(gba, GBA_LOG_WARN, "Savestate is for a different game");
78 error = true;
79 } else if (!gba->memory.rom && state->id != 0) {
80 GBALog(gba, GBA_LOG_WARN, "Savestate is for a game, but no game loaded");
81 error = true;
82 }
83 if (state->romCrc32 != gba->romCrc32) {
84 GBALog(gba, GBA_LOG_WARN, "Savestate is for a different version of the game");
85 }
86 if (state->cpu.cycles < 0) {
87 GBALog(gba, GBA_LOG_WARN, "Savestate is corrupted: CPU cycles are negative");
88 error = true;
89 }
90 if (state->cpu.nextEvent < 0) {
91 GBALog(gba, GBA_LOG_WARN, "Savestate is corrupted: Next event is negative");
92 error = true;
93 }
94 if (state->video.eventDiff < 0) {
95 GBALog(gba, GBA_LOG_WARN, "Savestate is corrupted: video eventDiff is negative");
96 error = true;
97 }
98 if (state->video.nextHblank - state->video.eventDiff < 0) {
99 GBALog(gba, GBA_LOG_WARN, "Savestate is corrupted: nextHblank is negative");
100 error = true;
101 }
102 if (state->timers[0].overflowInterval < 0 || state->timers[1].overflowInterval < 0 || state->timers[2].overflowInterval < 0 || state->timers[3].overflowInterval < 0) {
103 GBALog(gba, GBA_LOG_WARN, "Savestate is corrupted: overflowInterval is negative");
104 error = true;
105 }
106 if (state->timers[0].nextEvent < 0 || state->timers[1].nextEvent < 0 || state->timers[2].nextEvent < 0 || state->timers[3].nextEvent < 0) {
107 GBALog(gba, GBA_LOG_WARN, "Savestate is corrupted: timer nextEvent is negative");
108 error = true;
109 }
110 if (state->audio.eventDiff < 0) {
111 GBALog(gba, GBA_LOG_WARN, "Savestate is corrupted: audio eventDiff is negative");
112 error = true;
113 }
114 if (!state->audio.ch1Dead && (state->audio.ch1.envelopeNextStep < 0 ||
115 state->audio.ch1.waveNextStep < 0 ||
116 state->audio.ch1.sweepNextStep < 0 ||
117 state->audio.ch1.nextEvent < 0)) {
118 GBALog(gba, GBA_LOG_WARN, "Savestate is corrupted: audio channel 1 register is negative");
119 error = true;
120 }
121 if (!state->audio.ch2Dead && (state->audio.ch2.envelopeNextStep < 0 ||
122 state->audio.ch2.waveNextStep < 0 ||
123 state->audio.ch2.nextEvent < 0)) {
124 GBALog(gba, GBA_LOG_WARN, "Savestate is corrupted: audio channel 2 register is negative");
125 error = true;
126 }
127 if (state->audio.ch3.nextEvent < 0) {
128 GBALog(gba, GBA_LOG_WARN, "Savestate is corrupted: audio channel 3 register is negative");
129 error = true;
130 }
131 if (!state->audio.ch4Dead && (state->audio.ch4.envelopeNextStep < 0 ||
132 state->audio.ch4.nextEvent < 0)) {
133 GBALog(gba, GBA_LOG_WARN, "Savestate is corrupted: audio channel 4 register is negative");
134 error = true;
135 }
136 int region = (state->cpu.gprs[ARM_PC] >> BASE_OFFSET);
137 if ((region == REGION_CART0 || region == REGION_CART1 || region == REGION_CART2) && ((state->cpu.gprs[ARM_PC] - WORD_SIZE_ARM) & SIZE_CART0) >= gba->memory.romSize - WORD_SIZE_ARM) {
138 GBALog(gba, GBA_LOG_WARN, "Savestate created using a differently sized version of the ROM");
139 error = true;
140 }
141 if (error) {
142 return false;
143 }
144 memcpy(gba->cpu->gprs, state->cpu.gprs, sizeof(gba->cpu->gprs));
145 gba->cpu->cpsr = state->cpu.cpsr;
146 gba->cpu->spsr = state->cpu.spsr;
147 gba->cpu->cycles = state->cpu.cycles;
148 gba->cpu->nextEvent = state->cpu.nextEvent;
149 memcpy(gba->cpu->bankedRegisters, state->cpu.bankedRegisters, 6 * 7 * sizeof(int32_t));
150 memcpy(gba->cpu->bankedSPSRs, state->cpu.bankedSPSRs, 6 * sizeof(int32_t));
151 gba->cpu->privilegeMode = gba->cpu->cpsr.priv;
152 gba->cpu->memory.setActiveRegion(gba->cpu, gba->cpu->gprs[ARM_PC]);
153 if (state->biosPrefetch) {
154 gba->memory.biosPrefetch = state->biosPrefetch;
155 }
156 if (gba->cpu->cpsr.t) {
157 gba->cpu->executionMode = MODE_THUMB;
158 if (state->cpuPrefetch[0] && state->cpuPrefetch[1]) {
159 gba->cpu->prefetch[0] = state->cpuPrefetch[0] & 0xFFFF;
160 gba->cpu->prefetch[1] = state->cpuPrefetch[1] & 0xFFFF;
161 } else {
162 // Maintain backwards compat
163 LOAD_16(gba->cpu->prefetch[0], (gba->cpu->gprs[ARM_PC] - WORD_SIZE_THUMB) & gba->cpu->memory.activeMask, gba->cpu->memory.activeRegion);
164 LOAD_16(gba->cpu->prefetch[1], (gba->cpu->gprs[ARM_PC]) & gba->cpu->memory.activeMask, gba->cpu->memory.activeRegion);
165 }
166 } else {
167 gba->cpu->executionMode = MODE_ARM;
168 if (state->cpuPrefetch[0] && state->cpuPrefetch[1]) {
169 gba->cpu->prefetch[0] = state->cpuPrefetch[0];
170 gba->cpu->prefetch[1] = state->cpuPrefetch[1];
171 } else {
172 // Maintain backwards compat
173 LOAD_32(gba->cpu->prefetch[0], (gba->cpu->gprs[ARM_PC] - WORD_SIZE_ARM) & gba->cpu->memory.activeMask, gba->cpu->memory.activeRegion);
174 LOAD_32(gba->cpu->prefetch[1], (gba->cpu->gprs[ARM_PC]) & gba->cpu->memory.activeMask, gba->cpu->memory.activeRegion);
175 }
176 }
177
178 GBAMemoryDeserialize(&gba->memory, state);
179 GBAIODeserialize(gba, state);
180 GBAVideoDeserialize(&gba->video, state);
181 GBAAudioDeserialize(&gba->audio, state);
182 GBASavedataDeserialize(&gba->memory.savedata, state, false);
183
184 if (gba->rr) {
185 gba->rr->stateLoaded(gba->rr, state);
186 }
187 return true;
188}
189
190struct VFile* GBAGetState(struct GBA* gba, struct VDir* dir, int slot, bool write) {
191 char suffix[5] = { '\0' };
192 snprintf(suffix, sizeof(suffix), ".ss%d", slot);
193 return VDirOptionalOpenFile(dir, gba->activeFile, "savestate", suffix, write ? (O_CREAT | O_TRUNC | O_RDWR) : O_RDONLY);
194}
195
196#ifdef USE_PNG
197static bool _savePNGState(struct GBA* gba, struct VFile* vf) {
198 unsigned stride;
199 void* pixels = 0;
200 gba->video.renderer->getPixels(gba->video.renderer, &stride, &pixels);
201 if (!pixels) {
202 return false;
203 }
204
205 struct GBASerializedState* state = GBAAllocateState();
206 if (!state) {
207 return false;
208 }
209 png_structp png = PNGWriteOpen(vf);
210 png_infop info = PNGWriteHeader(png, VIDEO_HORIZONTAL_PIXELS, VIDEO_VERTICAL_PIXELS);
211 if (!png || !info) {
212 PNGWriteClose(png, info);
213 GBADeallocateState(state);
214 return false;
215 }
216 uLongf len = compressBound(sizeof(*state));
217 void* buffer = malloc(len);
218 if (!buffer) {
219 PNGWriteClose(png, info);
220 GBADeallocateState(state);
221 return false;
222 }
223 GBASerialize(gba, state);
224 compress(buffer, &len, (const Bytef*) state, sizeof(*state));
225 PNGWritePixels(png, VIDEO_HORIZONTAL_PIXELS, VIDEO_VERTICAL_PIXELS, stride, pixels);
226 PNGWriteCustomChunk(png, "gbAs", len, buffer);
227 PNGWriteClose(png, info);
228 free(buffer);
229 GBADeallocateState(state);
230 return true;
231}
232
233static int _loadPNGChunkHandler(png_structp png, png_unknown_chunkp chunk) {
234 if (strcmp((const char*) chunk->name, "gbAs") != 0) {
235 return 0;
236 }
237 struct GBASerializedState state;
238 uLongf len = sizeof(state);
239 uncompress((Bytef*) &state, &len, chunk->data, chunk->size);
240 if (!GBADeserialize(png_get_user_chunk_ptr(png), &state)) {
241 longjmp(png_jmpbuf(png), 1);
242 }
243 return 1;
244}
245
246static bool _loadPNGState(struct GBA* gba, struct VFile* vf) {
247 png_structp png = PNGReadOpen(vf, PNG_HEADER_BYTES);
248 png_infop info = png_create_info_struct(png);
249 png_infop end = png_create_info_struct(png);
250 if (!png || !info || !end) {
251 PNGReadClose(png, info, end);
252 return false;
253 }
254 uint32_t* pixels = malloc(VIDEO_HORIZONTAL_PIXELS * VIDEO_VERTICAL_PIXELS * 4);
255
256 PNGInstallChunkHandler(png, gba, _loadPNGChunkHandler, "gbAs");
257 bool success = PNGReadHeader(png, info);
258 success = success && PNGReadPixels(png, info, pixels, VIDEO_HORIZONTAL_PIXELS, VIDEO_VERTICAL_PIXELS, VIDEO_HORIZONTAL_PIXELS);
259 success = success && PNGReadFooter(png, end);
260 PNGReadClose(png, info, end);
261 if (success) {
262 gba->video.renderer->putPixels(gba->video.renderer, VIDEO_HORIZONTAL_PIXELS, pixels);
263 GBASyncForceFrame(gba->sync);
264 }
265
266 free(pixels);
267 return success;
268}
269#endif
270
271bool GBASaveState(struct GBAThread* threadContext, struct VDir* dir, int slot, bool screenshot) {
272 struct VFile* vf = GBAGetState(threadContext->gba, dir, slot, true);
273 if (!vf) {
274 return false;
275 }
276 bool success = GBASaveStateNamed(threadContext->gba, vf, screenshot);
277 vf->close(vf);
278 if (success) {
279 GBALog(threadContext->gba, GBA_LOG_STATUS, "State %i saved", slot);
280 } else {
281 GBALog(threadContext->gba, GBA_LOG_STATUS, "State %i failed to save", slot);
282 }
283 return success;
284}
285
286bool GBALoadState(struct GBAThread* threadContext, struct VDir* dir, int slot) {
287 struct VFile* vf = GBAGetState(threadContext->gba, dir, slot, false);
288 if (!vf) {
289 return false;
290 }
291 threadContext->rewindBufferSize = 0;
292 bool success = GBALoadStateNamed(threadContext->gba, vf);
293 vf->close(vf);
294 if (success) {
295 GBALog(threadContext->gba, GBA_LOG_STATUS, "State %i loaded", slot);
296 } else {
297 GBALog(threadContext->gba, GBA_LOG_STATUS, "State %i failed to load", slot);
298 }
299 return success;
300}
301
302bool GBASaveStateNamed(struct GBA* gba, struct VFile* vf, bool screenshot) {
303 if (!screenshot) {
304 vf->truncate(vf, sizeof(struct GBASerializedState));
305 struct GBASerializedState* state = vf->map(vf, sizeof(struct GBASerializedState), MAP_WRITE);
306 if (!state) {
307 return false;
308 }
309 GBASerialize(gba, state);
310 vf->unmap(vf, state, sizeof(struct GBASerializedState));
311 return true;
312 }
313#ifdef USE_PNG
314 else {
315 return _savePNGState(gba, vf);
316 }
317#endif
318 return false;
319}
320
321bool GBALoadStateNamed(struct GBA* gba, struct VFile* vf) {
322#ifdef USE_PNG
323 if (isPNG(vf)) {
324 return _loadPNGState(gba, vf);
325 }
326#endif
327 if (vf->size(vf) < (ssize_t) sizeof(struct GBASerializedState)) {
328 return false;
329 }
330 struct GBASerializedState* state = vf->map(vf, sizeof(struct GBASerializedState), MAP_READ);
331 if (!state) {
332 return false;
333 }
334 bool success = GBADeserialize(gba, state);
335 vf->unmap(vf, state, sizeof(struct GBASerializedState));
336 return success;
337}
338
339struct GBASerializedState* GBAAllocateState(void) {
340 return anonymousMemoryMap(sizeof(struct GBASerializedState));
341}
342
343void GBADeallocateState(struct GBASerializedState* state) {
344 mappedMemoryFree(state, sizeof(struct GBASerializedState));
345}
346
347void GBARecordFrame(struct GBAThread* thread) {
348 int offset = thread->rewindBufferWriteOffset;
349 struct GBASerializedState* state = thread->rewindBuffer[offset];
350 if (!state) {
351 state = GBAAllocateState();
352 thread->rewindBuffer[offset] = state;
353 }
354 GBASerialize(thread->gba, state);
355
356 if (thread->rewindScreenBuffer) {
357 unsigned stride;
358 uint8_t* pixels = 0;
359 thread->gba->video.renderer->getPixels(thread->gba->video.renderer, &stride, (void*) &pixels);
360 if (pixels) {
361 size_t y;
362 for (y = 0; y < VIDEO_VERTICAL_PIXELS; ++y) {
363 memcpy(&thread->rewindScreenBuffer[(offset * VIDEO_VERTICAL_PIXELS + y) * VIDEO_HORIZONTAL_PIXELS * BYTES_PER_PIXEL], &pixels[y * stride * BYTES_PER_PIXEL], VIDEO_HORIZONTAL_PIXELS * BYTES_PER_PIXEL);
364 }
365 }
366 }
367 thread->rewindBufferSize = thread->rewindBufferSize == thread->rewindBufferCapacity ? thread->rewindBufferCapacity : thread->rewindBufferSize + 1;
368 thread->rewindBufferWriteOffset = (offset + 1) % thread->rewindBufferCapacity;
369}
370
371void GBARewindSettingsChanged(struct GBAThread* threadContext, int newCapacity, int newInterval) {
372 if (newCapacity == threadContext->rewindBufferCapacity && newInterval == threadContext->rewindBufferInterval) {
373 return;
374 }
375 threadContext->rewindBufferInterval = newInterval;
376 threadContext->rewindBufferNext = threadContext->rewindBufferInterval;
377 threadContext->rewindBufferSize = 0;
378 if (threadContext->rewindBuffer) {
379 int i;
380 for (i = 0; i < threadContext->rewindBufferCapacity; ++i) {
381 GBADeallocateState(threadContext->rewindBuffer[i]);
382 }
383 free(threadContext->rewindBuffer);
384 free(threadContext->rewindScreenBuffer);
385 }
386 threadContext->rewindBufferCapacity = newCapacity;
387 if (threadContext->rewindBufferCapacity > 0) {
388 threadContext->rewindBuffer = calloc(threadContext->rewindBufferCapacity, sizeof(struct GBASerializedState*));
389 threadContext->rewindScreenBuffer = calloc(threadContext->rewindBufferCapacity, VIDEO_VERTICAL_PIXELS * VIDEO_HORIZONTAL_PIXELS * BYTES_PER_PIXEL);
390 } else {
391 threadContext->rewindBuffer = 0;
392 threadContext->rewindScreenBuffer = 0;
393 }
394}
395
396int GBARewind(struct GBAThread* thread, int nStates) {
397 if (nStates > thread->rewindBufferSize || nStates < 0) {
398 nStates = thread->rewindBufferSize;
399 }
400 if (nStates == 0) {
401 return 0;
402 }
403 int offset = thread->rewindBufferWriteOffset - nStates;
404 if (offset < 0) {
405 offset += thread->rewindBufferCapacity;
406 }
407 struct GBASerializedState* state = thread->rewindBuffer[offset];
408 if (!state) {
409 return 0;
410 }
411 thread->rewindBufferSize -= nStates;
412 thread->rewindBufferWriteOffset = offset;
413 GBADeserialize(thread->gba, state);
414 if (thread->rewindScreenBuffer) {
415 thread->gba->video.renderer->putPixels(thread->gba->video.renderer, VIDEO_HORIZONTAL_PIXELS, &thread->rewindScreenBuffer[offset * VIDEO_HORIZONTAL_PIXELS * VIDEO_VERTICAL_PIXELS * BYTES_PER_PIXEL]);
416 }
417 return nStates;
418}
419
420void GBARewindAll(struct GBAThread* thread) {
421 GBARewind(thread, thread->rewindBufferSize);
422}