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 "util/common.h"
9
10#include "gba/gba.h"
11#include "gba/renderers/video-software.h"
12#include "gba/serialize.h"
13#include "gba/supervisor/overrides.h"
14#include "gba/video.h"
15#include "util/vfs.h"
16
17#define SAMPLES 1024
18
19static retro_environment_t environCallback;
20static retro_video_refresh_t videoCallback;
21static retro_audio_sample_batch_t audioCallback;
22static retro_input_poll_t inputPollCallback;
23static retro_input_state_t inputCallback;
24static retro_log_printf_t logCallback;
25
26static void GBARetroLog(struct GBAThread* thread, enum GBALogLevel level, const char* format, va_list args);
27
28static void _postAudioBuffer(struct GBAAVStream*, struct GBAAudio* audio);
29static void _postVideoFrame(struct GBAAVStream*, struct GBAVideoRenderer* renderer);
30
31static struct GBA gba;
32static struct ARMCore cpu;
33static struct GBAVideoSoftwareRenderer renderer;
34static struct VFile* rom;
35static void* data;
36static struct VFile* save;
37static void* savedata;
38static struct GBAAVStream stream;
39
40unsigned retro_api_version(void) {
41 return RETRO_API_VERSION;
42}
43
44void retro_set_environment(retro_environment_t env) {
45 environCallback = env;
46}
47
48void retro_set_video_refresh(retro_video_refresh_t video) {
49 videoCallback = video;
50}
51
52void retro_set_audio_sample(retro_audio_sample_t audio) {
53 UNUSED(audio);
54}
55
56void retro_set_audio_sample_batch(retro_audio_sample_batch_t audioBatch) {
57 audioCallback = audioBatch;
58}
59
60void retro_set_input_poll(retro_input_poll_t inputPoll) {
61 inputPollCallback = inputPoll;
62}
63
64void retro_set_input_state(retro_input_state_t input) {
65 inputCallback = input;
66}
67
68void retro_get_system_info(struct retro_system_info* info) {
69 info->need_fullpath = false;
70 info->valid_extensions = "gba";
71 info->library_version = projectVersion;
72 info->library_name = projectName;
73 info->block_extract = false;
74}
75
76void retro_get_system_av_info(struct retro_system_av_info* info) {
77 info->geometry.base_width = VIDEO_HORIZONTAL_PIXELS;
78 info->geometry.base_height = VIDEO_VERTICAL_PIXELS;
79 info->geometry.max_width = VIDEO_HORIZONTAL_PIXELS;
80 info->geometry.max_height = VIDEO_VERTICAL_PIXELS;
81 info->timing.fps = GBA_ARM7TDMI_FREQUENCY / (float) VIDEO_TOTAL_LENGTH;
82 info->timing.sample_rate = 32768;
83}
84
85void retro_init(void) {
86 enum retro_pixel_format fmt;
87#ifdef COLOR_16_BIT
88#ifdef COLOR_5_6_5
89 fmt = RETRO_PIXEL_FORMAT_RGB565;
90#else
91#warning This pixel format is unsupported. Please use -DCOLOR_16-BIT -DCOLOR_5_6_5
92 fmt = RETRO_PIXEL_FORMAT_0RGB1555;
93#endif
94#else
95#warning This pixel format is unsupported. Please use -DCOLOR_16-BIT -DCOLOR_5_6_5
96 fmt = RETRO_PIXEL_FORMAT_XRGB8888;
97#endif
98 environCallback(RETRO_ENVIRONMENT_SET_PIXEL_FORMAT, &fmt);
99
100 struct retro_input_descriptor inputDescriptors[] = {
101 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_A, "A" },
102 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_B, "B" },
103 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_SELECT, "Select" },
104 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_START, "Start" },
105 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_RIGHT, "Right" },
106 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_LEFT, "Left" },
107 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_UP, "Up" },
108 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_DOWN, "Down" },
109 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_R, "R" },
110 { 0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_L, "L" }
111 };
112 environCallback(RETRO_ENVIRONMENT_SET_INPUT_DESCRIPTORS, &inputDescriptors);
113
114 // TODO: RETRO_ENVIRONMENT_SET_SUPPORT_NO_GAME when BIOS booting is supported
115 // TODO: RETRO_ENVIRONMENT_GET_RUMBLE_INTERFACE
116
117 struct retro_log_callback log;
118 if (environCallback(RETRO_ENVIRONMENT_GET_LOG_INTERFACE, &log)) {
119 logCallback = log.log;
120 } else {
121 logCallback = 0;
122 }
123
124 stream.postAudioFrame = 0;
125 stream.postAudioBuffer = _postAudioBuffer;
126 stream.postVideoFrame = _postVideoFrame;
127
128 GBACreate(&gba);
129 ARMSetComponents(&cpu, &gba.d, 0, 0);
130 ARMInit(&cpu);
131 gba.logLevel = 0; // TODO: Settings
132 gba.logHandler = GBARetroLog;
133 gba.stream = &stream;
134 gba.idleOptimization = IDLE_LOOP_REMOVE; // TODO: Settings
135 rom = 0;
136
137 GBAVideoSoftwareRendererCreate(&renderer);
138 renderer.outputBuffer = malloc(256 * VIDEO_VERTICAL_PIXELS * BYTES_PER_PIXEL);
139 renderer.outputBufferStride = 256;
140 GBAVideoAssociateRenderer(&gba.video, &renderer.d);
141
142 GBAAudioResizeBuffer(&gba.audio, SAMPLES);
143
144#if RESAMPLE_LIBRARY == RESAMPLE_BLIP_BUF
145 blip_set_rates(gba.audio.left, GBA_ARM7TDMI_FREQUENCY, 32768);
146 blip_set_rates(gba.audio.right, GBA_ARM7TDMI_FREQUENCY, 32768);
147#endif
148}
149
150void retro_deinit(void) {
151 GBADestroy(&gba);
152}
153
154void retro_run(void) {
155 int keys;
156 gba.keySource = &keys;
157 inputPollCallback();
158
159 keys = 0;
160 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_A)) << 0;
161 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_B)) << 1;
162 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_SELECT)) << 2;
163 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_START)) << 3;
164 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_RIGHT)) << 4;
165 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_LEFT)) << 5;
166 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_UP)) << 6;
167 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_DOWN)) << 7;
168 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_R)) << 8;
169 keys |= (!!inputCallback(0, RETRO_DEVICE_JOYPAD, 0, RETRO_DEVICE_ID_JOYPAD_L)) << 9;
170
171 int frameCount = gba.video.frameCounter;
172 while (gba.video.frameCounter == frameCount) {
173 ARMRunLoop(&cpu);
174 }
175}
176
177void retro_reset(void) {
178 ARMReset(&cpu);
179}
180
181bool retro_load_game(const struct retro_game_info* game) {
182 if (game->data) {
183 data = malloc(game->size);
184 memcpy(data, game->data, game->size);
185 rom = VFileFromMemory(data, game->size);
186 } else {
187 data = 0;
188 rom = VFileOpen(game->path, O_RDONLY);
189 }
190 if (!rom) {
191 return false;
192 }
193 if (!GBAIsROM(rom)) {
194 return false;
195 }
196
197 savedata = malloc(SIZE_CART_FLASH1M);
198 save = VFileFromMemory(savedata, SIZE_CART_FLASH1M);
199
200 GBALoadROM(&gba, rom, save, game->path);
201 GBAOverrideApplyDefaults(&gba);
202
203 ARMReset(&cpu);
204 return true;
205}
206
207void retro_unload_game(void) {
208 rom->close(rom);
209 rom = 0;
210 free(data);
211 data = 0;
212 save->close(save);
213 save = 0;
214 free(savedata);
215 savedata = 0;
216}
217
218size_t retro_serialize_size(void) {
219 return sizeof(struct GBASerializedState);
220}
221
222bool retro_serialize(void* data, size_t size) {
223 if (size != retro_serialize_size()) {
224 return false;
225 }
226 GBASerialize(&gba, data);
227 return true;
228}
229
230bool retro_unserialize(const void* data, size_t size) {
231 if (size != retro_serialize_size()) {
232 return false;
233 }
234 GBADeserialize(&gba, data);
235 return true;
236}
237
238void retro_cheat_reset(void) {
239 // TODO: Cheats
240}
241
242void retro_cheat_set(unsigned index, bool enabled, const char* code) {
243 // TODO: Cheats
244 UNUSED(index);
245 UNUSED(enabled);
246 UNUSED(code);
247}
248
249unsigned retro_get_region(void) {
250 return RETRO_REGION_NTSC; // TODO: This isn't strictly true
251}
252
253void retro_set_controller_port_device(unsigned port, unsigned device) {
254 UNUSED(port);
255 UNUSED(device);
256}
257
258bool retro_load_game_special(unsigned game_type, const struct retro_game_info* info, size_t num_info) {
259 UNUSED(game_type);
260 UNUSED(info);
261 UNUSED(num_info);
262 return false;
263}
264
265void* retro_get_memory_data(unsigned id) {
266 if (id != RETRO_MEMORY_SAVE_RAM) {
267 return 0;
268 }
269 return savedata;
270}
271
272size_t retro_get_memory_size(unsigned id) {
273 if (id != RETRO_MEMORY_SAVE_RAM) {
274 return 0;
275 }
276 switch (gba.memory.savedata.type) {
277 case SAVEDATA_AUTODETECT:
278 case SAVEDATA_FLASH1M:
279 return SIZE_CART_FLASH1M;
280 case SAVEDATA_FLASH512:
281 return SIZE_CART_FLASH512;
282 case SAVEDATA_EEPROM:
283 return SIZE_CART_EEPROM;
284 case SAVEDATA_SRAM:
285 return SIZE_CART_SRAM;
286 case SAVEDATA_FORCE_NONE:
287 return 0;
288 }
289 return 0;
290}
291
292void GBARetroLog(struct GBAThread* thread, enum GBALogLevel level, const char* format, va_list args) {
293 UNUSED(thread);
294 if (!logCallback) {
295 return;
296 }
297
298 char message[128];
299 vsnprintf(message, sizeof(message), format, args);
300
301 enum retro_log_level retroLevel = RETRO_LOG_INFO;
302 switch (level) {
303 case GBA_LOG_ALL:
304 case GBA_LOG_ERROR:
305 case GBA_LOG_FATAL:
306 retroLevel = RETRO_LOG_ERROR;
307 break;
308 case GBA_LOG_WARN:
309 retroLevel = RETRO_LOG_WARN;
310 break;
311 case GBA_LOG_INFO:
312 case GBA_LOG_GAME_ERROR:
313 case GBA_LOG_SWI:
314 retroLevel = RETRO_LOG_INFO;
315 break;
316 case GBA_LOG_DEBUG:
317 case GBA_LOG_STUB:
318 retroLevel = RETRO_LOG_DEBUG;
319 break;
320 }
321 logCallback(retroLevel, "%s\n", message);
322}
323
324static void _postAudioBuffer(struct GBAAVStream* stream, struct GBAAudio* audio) {
325 UNUSED(stream);
326 int16_t samples[SAMPLES * 2];
327#if RESAMPLE_LIBRARY == RESAMPLE_BLIP_BUF
328 blip_read_samples(audio->left, samples, SAMPLES, true);
329 blip_read_samples(audio->right, samples + 1, SAMPLES, true);
330#else
331 int16_t samplesR[SAMPLES];
332 GBAAudioCopy(audio, &samples[SAMPLES], samplesR, SAMPLES);
333 size_t i;
334 for (i = 0; i < SAMPLES; ++i) {
335 samples[i * 2] = samples[SAMPLES + i];
336 samples[i * 2 + 1] = samplesR[i];
337 }
338#endif
339 audioCallback(samples, SAMPLES);
340}
341
342static void _postVideoFrame(struct GBAAVStream* stream, struct GBAVideoRenderer* renderer) {
343 UNUSED(stream);
344 void* pixels;
345 unsigned stride;
346 renderer->getPixels(renderer, &stride, &pixels);
347 videoCallback(pixels, VIDEO_HORIZONTAL_PIXELS, VIDEO_VERTICAL_PIXELS, BYTES_PER_PIXEL * stride);
348}