src/platform/libretro/libretro.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 "libretro.h"
7
8#include "gba/gba.h"
9#include "gba/renderers/video-software.h"
10#include "gba/serialize.h"
11#include "gba/supervisor/overrides.h"
12#include "gba/video.h"
13#include "util/vfs.h"
14
15static retro_environment_t environCallback;
16static retro_video_refresh_t videoCallback;
17static retro_audio_sample_t audioCallback;
18static retro_input_poll_t inputPollCallback;
19static retro_input_state_t inputCallback;
20static retro_log_printf_t logCallback;
21
22static void GBARetroLog(struct GBAThread* thread, enum GBALogLevel level, const char* format, va_list args);
23
24static void _postAudioFrame(struct GBAAVStream*, int16_t left, int16_t right);
25static void _postVideoFrame(struct GBAAVStream*, struct GBAVideoRenderer* renderer);
26
27static struct GBA gba;
28static struct ARMCore cpu;
29static struct GBAVideoSoftwareRenderer renderer;
30static struct VFile* rom;
31static struct VFile* save;
32static void* savedata;
33static struct GBAAVStream stream;
34
35unsigned retro_api_version(void) {
36 return RETRO_API_VERSION;
37}
38
39void retro_set_environment(retro_environment_t environ) {
40 environCallback = environ;
41}
42
43void retro_set_video_refresh(retro_video_refresh_t video) {
44 videoCallback = video;
45}
46
47void retro_set_audio_sample(retro_audio_sample_t audio) {
48 audioCallback = audio;
49}
50
51void retro_set_audio_sample_batch(retro_audio_sample_batch_t audioBatch) {
52 UNUSED(audioBatch);
53}
54
55void retro_set_input_poll(retro_input_poll_t inputPoll) {
56 inputPollCallback = inputPoll;
57}
58
59void retro_set_input_state(retro_input_state_t input) {
60 inputCallback = input;
61}
62
63void retro_get_system_info(struct retro_system_info* info) {
64 info->need_fullpath = false;
65 info->valid_extensions = "gba";
66 info->library_version = PROJECT_VERSION;
67 info->library_name = PROJECT_NAME;
68 info->block_extract = false;
69}
70
71void retro_get_system_av_info(struct retro_system_av_info* info) {
72 info->geometry.base_width = VIDEO_HORIZONTAL_PIXELS;
73 info->geometry.base_height = VIDEO_VERTICAL_PIXELS;
74 info->geometry.max_width = VIDEO_HORIZONTAL_PIXELS;
75 info->geometry.max_height = VIDEO_VERTICAL_PIXELS;
76 info->timing.fps = GBA_ARM7TDMI_FREQUENCY / (float) VIDEO_TOTAL_LENGTH;
77 info->timing.sample_rate = 32768;
78}
79
80void retro_init(void) {
81 enum retro_pixel_format fmt;
82#ifdef COLOR_16_BIT
83#ifdef COLOR_5_6_5
84 fmt = RETRO_PIXEL_FORMAT_RGB565;
85#else
86#warning This pixel format is unsupported. Please use -DCOLOR_16-BIT -DCOLOR_5_6_5
87 fmt = RETRO_PIXEL_FORMAT_0RGB1555;
88#endif
89#else
90#warning This pixel format is unsupported. Please use -DCOLOR_16-BIT -DCOLOR_5_6_5
91 fmt = RETRO_PIXEL_FORMAT_XRGB8888;
92#endif
93 environCallback(RETRO_ENVIRONMENT_SET_PIXEL_FORMAT, &fmt);
94
95 struct retro_input_descriptor inputDescriptors[] = {
96 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_A, "A" },
97 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_B, "B" },
98 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_SELECT, "Select" },
99 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_START, "Start" },
100 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_RIGHT, "Right" },
101 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_LEFT, "Left" },
102 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_UP, "Up" },
103 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_DOWN, "Down" },
104 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_R, "R" },
105 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_L, "L" }
106 };
107 environCallback(RETRO_ENVIRONMENT_SET_INPUT_DESCRIPTORS, &inputDescriptors);
108
109 // TODO: RETRO_ENVIRONMENT_SET_SUPPORT_NO_GAME when BIOS booting is supported
110 // TODO: RETRO_ENVIRONMENT_GET_RUMBLE_INTERFACE
111
112 struct retro_log_callback log;
113 if (environCallback(RETRO_ENVIRONMENT_GET_LOG_INTERFACE, &log)) {
114 logCallback = log.log;
115 } else {
116 logCallback = 0;
117 }
118
119 stream.postAudioFrame = _postAudioFrame;
120 stream.postVideoFrame = _postVideoFrame;
121
122 GBACreate(&gba);
123 ARMSetComponents(&cpu, &gba.d, 0, 0);
124 ARMInit(&cpu);
125 gba.logLevel = 0; // TODO: Settings
126 gba.logHandler = GBARetroLog;
127 gba.stream = &stream;
128 gba.idleOptimization = IDLE_LOOP_REMOVE; // TODO: Settings
129 rom = 0;
130
131 GBAVideoSoftwareRendererCreate(&renderer);
132 renderer.outputBuffer = malloc(256 * VIDEO_VERTICAL_PIXELS * BYTES_PER_PIXEL);
133 renderer.outputBufferStride = 256;
134 GBAVideoAssociateRenderer(&gba.video, &renderer.d);
135}
136
137void retro_deinit(void) {
138 GBADestroy(&gba);
139}
140
141void retro_run(void) {
142 int keys;
143 gba.keySource = &keys;
144 inputPollCallback();
145
146 keys = 0;
147 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_A)) << 0;
148 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_B)) << 1;
149 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_SELECT)) << 2;
150 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_START)) << 3;
151 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_RIGHT)) << 4;
152 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_LEFT)) << 5;
153 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_UP)) << 6;
154 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_DOWN)) << 7;
155 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_R)) << 8;
156 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_L)) << 9;
157
158 int frameCount = gba.video.frameCounter;
159 while (gba.video.frameCounter == frameCount) {
160 ARMRunLoop(&cpu);
161 }
162 videoCallback(renderer.outputBuffer, VIDEO_HORIZONTAL_PIXELS, VIDEO_VERTICAL_PIXELS, BYTES_PER_PIXEL * 256);
163}
164
165void retro_reset(void) {
166 ARMReset(&cpu);
167}
168
169bool retro_load_game(const struct retro_game_info* game) {
170 if (game->data) {
171 rom = VFileFromMemory((void*) game->data, game->size); // TODO: readonly VFileMem
172 } else {
173 rom = VFileOpen(game->path, O_RDONLY);
174 }
175 if (!rom) {
176 return false;
177 }
178 if (!GBAIsROM(rom)) {
179 return false;
180 }
181
182 savedata = malloc(SIZE_CART_FLASH1M);
183 save = VFileFromMemory(savedata, SIZE_CART_FLASH1M);
184
185 GBALoadROM(&gba, rom, save, game->path);
186
187 struct GBACartridgeOverride override;
188 const struct GBACartridge* cart = (const struct GBACartridge*) gba.memory.rom;
189 memcpy(override.id, &cart->id, sizeof(override.id));
190 if (GBAOverrideFind(0, &override)) {
191 GBAOverrideApply(&gba, &override);
192 }
193
194 ARMReset(&cpu);
195 return true;
196}
197
198void retro_unload_game(void) {
199 rom->close(rom);
200 rom = 0;
201 save->close(save);
202 save = 0;
203 free(savedata);
204 savedata = 0;
205}
206
207size_t retro_serialize_size(void) {
208 return sizeof(struct GBASerializedState);
209}
210
211bool retro_serialize(void* data, size_t size) {
212 if (size != retro_serialize_size()) {
213 return false;
214 }
215 GBASerialize(&gba, data);
216 return true;
217}
218
219bool retro_unserialize(const void* data, size_t size) {
220 if (size != retro_serialize_size()) {
221 return false;
222 }
223 GBADeserialize(&gba, data);
224 return true;
225}
226
227void retro_cheat_reset(void) {
228 // TODO: Cheats
229}
230
231void retro_cheat_set(unsigned index, bool enabled, const char* code) {
232 // TODO: Cheats
233 UNUSED(index);
234 UNUSED(enabled);
235 UNUSED(code);
236}
237
238unsigned retro_get_region(void) {
239 return RETRO_REGION_NTSC; // TODO: This isn't strictly true
240}
241
242void retro_set_controller_port_device(unsigned port, unsigned device) {
243 UNUSED(port);
244 UNUSED(device);
245}
246
247bool retro_load_game_special(unsigned game_type, const struct retro_game_info* info, size_t num_info) {
248 UNUSED(game_type);
249 UNUSED(info);
250 UNUSED(num_info);
251 return false;
252}
253
254void* retro_get_memory_data(unsigned id) {
255 if (id != RETRO_MEMORY_SAVE_RAM) {
256 return 0;
257 }
258 return savedata;
259}
260
261size_t retro_get_memory_size(unsigned id) {
262 if (id != RETRO_MEMORY_SAVE_RAM) {
263 return 0;
264 }
265 switch (gba.memory.savedata.type) {
266 case SAVEDATA_AUTODETECT:
267 case SAVEDATA_FLASH1M:
268 return SIZE_CART_FLASH1M;
269 case SAVEDATA_FLASH512:
270 return SIZE_CART_FLASH512;
271 case SAVEDATA_EEPROM:
272 return SIZE_CART_EEPROM;
273 case SAVEDATA_SRAM:
274 return SIZE_CART_SRAM;
275 case SAVEDATA_FORCE_NONE:
276 return 0;
277 }
278}
279
280void GBARetroLog(struct GBAThread* thread, enum GBALogLevel level, const char* format, va_list args) {
281 UNUSED(thread);
282 if (!logCallback) {
283 return;
284 }
285
286 char message[128];
287 vsnprintf(message, sizeof(message), format, args);
288
289 enum retro_log_level retroLevel = RETRO_LOG_INFO;
290 switch (level) {
291 case GBA_LOG_ALL:
292 case GBA_LOG_ERROR:
293 case GBA_LOG_FATAL:
294 retroLevel = RETRO_LOG_ERROR;
295 break;
296 case GBA_LOG_WARN:
297 retroLevel = RETRO_LOG_WARN;
298 break;
299 case GBA_LOG_INFO:
300 case GBA_LOG_GAME_ERROR:
301 case GBA_LOG_SWI:
302 retroLevel = RETRO_LOG_INFO;
303 break;
304 case GBA_LOG_DEBUG:
305 case GBA_LOG_STUB:
306 retroLevel = RETRO_LOG_DEBUG;
307 break;
308 }
309 logCallback(retroLevel, "%s\n", message);
310}
311
312static void _postAudioFrame(struct GBAAVStream* stream, int16_t left, int16_t right) {
313 UNUSED(stream);
314 audioCallback(left, right);
315}
316
317static void _postVideoFrame(struct GBAAVStream* stream, struct GBAVideoRenderer* renderer) {
318 UNUSED(stream);
319 void* pixels;
320 unsigned stride;
321 renderer->getPixels(renderer, &stride, &pixels);
322 videoCallback(pixels, VIDEO_HORIZONTAL_PIXELS, VIDEO_VERTICAL_PIXELS, BYTES_PER_PIXEL * stride);
323}