Mercurial > repos > simple16
annotate src/system_sdl.c @ 24:4c9dbfa30a66
Implemented audio
| author | Michael Pavone <pavone@retrodev.com> |
|---|---|
| date | Thu, 31 Mar 2016 00:07:37 -0700 |
| parents | 41ec033ef8c3 |
| children | c677507682e3 |
| rev | line source |
|---|---|
| 15 | 1 #include <SDL.h> |
| 2 #include <stdint.h> | |
|
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Poll events regularly to avoid unresponsive app warnings. Handle quit event
Michael Pavone <pavone@retrodev.com>
parents:
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changeset
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3 #include <stdlib.h> |
| 15 | 4 |
| 5 | |
| 24 | 6 static SDL_Window *window; |
| 7 static SDL_Renderer *renderer; | |
| 8 static SDL_Texture *texture; | |
| 9 static int sample_rate; | |
| 10 static int buffer_size; | |
| 11 static uint8_t quitting; | |
| 12 | |
| 13 static SDL_mutex * audio_mutex; | |
| 14 static SDL_cond * source_ready; | |
| 15 static SDL_cond * output_ready; | |
| 16 static int16_t *source_buffer; | |
| 15 | 17 |
| 24 | 18 static void audio_callback(void * userdata, uint8_t *stream, int len) |
| 19 { | |
| 20 uint8_t local_quit; | |
| 21 int16_t *local_source; | |
| 22 SDL_LockMutex(audio_mutex); | |
| 23 local_source = NULL; | |
| 24 do { | |
| 25 if (!local_source) { | |
| 26 local_source = source_buffer; | |
| 27 source_buffer = NULL; | |
| 28 SDL_CondSignal(output_ready); | |
| 29 } | |
| 30 if (!quitting && !local_source) { | |
| 31 SDL_CondWait(source_ready, audio_mutex); | |
| 32 } | |
| 33 } while (!quitting && !local_source); | |
| 34 local_quit = quitting; | |
| 35 SDL_UnlockMutex(audio_mutex); | |
| 36 if (!local_quit) { | |
| 37 fflush(stdout); | |
| 38 memcpy(stream, local_source, len); | |
| 39 } | |
| 40 } | |
| 41 | |
| 42 static void close_audio() | |
| 15 | 43 { |
| 24 | 44 SDL_LockMutex(audio_mutex); |
| 45 quitting = 1; | |
| 46 SDL_CondSignal(source_ready); | |
| 47 SDL_UnlockMutex(audio_mutex); | |
| 48 SDL_CloseAudio(); | |
| 49 } | |
| 50 | |
| 51 void system_present_audio(int16_t *buffer) | |
| 52 { | |
| 53 SDL_LockMutex(audio_mutex); | |
| 54 while (source_buffer) { | |
| 55 SDL_CondWait(output_ready, audio_mutex); | |
| 56 } | |
| 57 source_buffer = buffer; | |
| 58 SDL_CondSignal(source_ready); | |
| 59 SDL_UnlockMutex(audio_mutex); | |
| 60 } | |
| 61 | |
| 62 int system_sample_rate() | |
| 63 { | |
| 64 return sample_rate; | |
| 65 } | |
| 66 | |
| 67 int system_buffer_size() | |
| 68 { | |
| 69 return buffer_size; | |
| 70 } | |
| 71 | |
| 72 int system_init(int width, int height, int desired_sample_rate) | |
| 73 { | |
| 74 if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO) < 0) { | |
| 15 | 75 fprintf(stderr, "Failed to init SDL: %s\n", SDL_GetError()); |
| 76 return 0; | |
| 77 } | |
| 78 atexit(SDL_Quit); | |
| 17 | 79 window = SDL_CreateWindow("simple16", 0, 0, width, height, 0); |
| 80 if (!window) { | |
| 81 fprintf(stderr, "Failed to create window: %s\n", SDL_GetError()); | |
| 15 | 82 return 0; |
| 83 } | |
| 17 | 84 |
| 85 renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC); | |
| 86 if (!renderer) { | |
| 87 fprintf(stderr, "Failed to create renderer: %s\n", SDL_GetError()); | |
| 24 | 88 goto renderer_error; |
| 17 | 89 } |
| 90 | |
| 15 | 91 texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_RGB444, SDL_TEXTUREACCESS_STREAMING, 320, 240); |
| 92 if (!texture) { | |
| 93 fprintf(stderr, "Failed to create texture: %s\n", SDL_GetError()); | |
| 24 | 94 goto error; |
| 15 | 95 } |
| 24 | 96 |
| 97 audio_mutex = SDL_CreateMutex(); | |
| 98 source_ready = SDL_CreateCond(); | |
| 99 output_ready = SDL_CreateCond(); | |
| 100 | |
| 101 SDL_AudioSpec desired, actual; | |
| 102 desired.freq = desired_sample_rate; | |
| 103 desired.format = AUDIO_S16SYS; | |
| 104 desired.channels = 1; | |
| 105 desired.callback = audio_callback; | |
| 106 desired.userdata = NULL; | |
| 107 desired.samples = 512; | |
| 108 | |
| 109 if (SDL_OpenAudio(&desired, &actual) < 0) { | |
| 110 fprintf(stderr, "Failed to open audio: %s\n", SDL_GetError()); | |
| 111 goto error; | |
| 112 } | |
| 113 printf("Initialized audio at frequency %d with a %d sample buffer and %d channels\n", actual.freq, actual.samples, actual.channels); | |
| 114 sample_rate = actual.freq; | |
| 115 buffer_size = actual.samples; | |
| 116 atexit(close_audio); | |
| 117 SDL_PauseAudio(0); | |
| 118 | |
| 15 | 119 return 1; |
| 24 | 120 |
| 121 error: | |
| 122 SDL_DestroyRenderer(renderer); | |
| 123 renderer_error: | |
| 124 SDL_DestroyWindow(window); | |
| 125 return 0; | |
| 15 | 126 } |
| 127 | |
| 128 uint16_t *system_get_framebuffer(int *pitch) | |
| 129 { | |
| 130 void *pixels; | |
| 131 if (SDL_LockTexture(texture, NULL, &pixels, pitch) < 0) { | |
| 132 fprintf(stderr, "Failed to lock texture: %s\n", SDL_GetError()); | |
| 133 return NULL; | |
| 134 } | |
| 135 return pixels; | |
| 136 } | |
| 137 | |
| 138 void system_framebuffer_updated() | |
| 139 { | |
| 140 SDL_UnlockTexture(texture); | |
| 141 SDL_RenderCopy(renderer, texture, NULL, NULL); | |
| 142 SDL_RenderPresent(renderer); | |
| 143 } | |
| 144 | |
|
16
ae58e7c3c328
Poll events regularly to avoid unresponsive app warnings. Handle quit event
Michael Pavone <pavone@retrodev.com>
parents:
15
diff
changeset
|
145 void system_poll_events() |
|
ae58e7c3c328
Poll events regularly to avoid unresponsive app warnings. Handle quit event
Michael Pavone <pavone@retrodev.com>
parents:
15
diff
changeset
|
146 { |
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ae58e7c3c328
Poll events regularly to avoid unresponsive app warnings. Handle quit event
Michael Pavone <pavone@retrodev.com>
parents:
15
diff
changeset
|
147 SDL_Event event; |
|
ae58e7c3c328
Poll events regularly to avoid unresponsive app warnings. Handle quit event
Michael Pavone <pavone@retrodev.com>
parents:
15
diff
changeset
|
148 while(SDL_PollEvent(&event)) |
|
ae58e7c3c328
Poll events regularly to avoid unresponsive app warnings. Handle quit event
Michael Pavone <pavone@retrodev.com>
parents:
15
diff
changeset
|
149 { |
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ae58e7c3c328
Poll events regularly to avoid unresponsive app warnings. Handle quit event
Michael Pavone <pavone@retrodev.com>
parents:
15
diff
changeset
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150 switch (event.type) |
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ae58e7c3c328
Poll events regularly to avoid unresponsive app warnings. Handle quit event
Michael Pavone <pavone@retrodev.com>
parents:
15
diff
changeset
|
151 { |
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ae58e7c3c328
Poll events regularly to avoid unresponsive app warnings. Handle quit event
Michael Pavone <pavone@retrodev.com>
parents:
15
diff
changeset
|
152 case SDL_QUIT: |
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ae58e7c3c328
Poll events regularly to avoid unresponsive app warnings. Handle quit event
Michael Pavone <pavone@retrodev.com>
parents:
15
diff
changeset
|
153 exit(0); |
|
ae58e7c3c328
Poll events regularly to avoid unresponsive app warnings. Handle quit event
Michael Pavone <pavone@retrodev.com>
parents:
15
diff
changeset
|
154 break; |
|
ae58e7c3c328
Poll events regularly to avoid unresponsive app warnings. Handle quit event
Michael Pavone <pavone@retrodev.com>
parents:
15
diff
changeset
|
155 } |
|
ae58e7c3c328
Poll events regularly to avoid unresponsive app warnings. Handle quit event
Michael Pavone <pavone@retrodev.com>
parents:
15
diff
changeset
|
156 } |
|
ae58e7c3c328
Poll events regularly to avoid unresponsive app warnings. Handle quit event
Michael Pavone <pavone@retrodev.com>
parents:
15
diff
changeset
|
157 } |
|
ae58e7c3c328
Poll events regularly to avoid unresponsive app warnings. Handle quit event
Michael Pavone <pavone@retrodev.com>
parents:
15
diff
changeset
|
158 |