Mercurial > repos > simple16

annotate src/system_sdl.c @ 38:3b7910575a00

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Implemented basic keyboard support
author Michael Pavone <pavone@retrodev.com>
date Mon, 04 Apr 2016 09:13:14 -0700
parents c677507682e3
children 8e39a877c651
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1 #include <SDL.h>
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2 #include <stdint.h>
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ae58e7c3c328 Poll events regularly to avoid unresponsive app warnings. Handle quit event
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3 #include <stdlib.h>
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4 #include "controller.h"
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6
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7 static SDL_Window *window;
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8 static SDL_Renderer *renderer;
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9 static SDL_Texture *texture;
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10 static int sample_rate;
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11 static int buffer_size;
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12 static uint8_t quitting;
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13
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14 static SDL_mutex * audio_mutex;
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15 static SDL_cond * source_ready;
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16 static SDL_cond * output_ready;
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17 static int16_t *source_buffer;
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18
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19 static void audio_callback(void * userdata, uint8_t *stream, int len)
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20 {
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21 uint8_t local_quit;
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22 int16_t *local_source;
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23 SDL_LockMutex(audio_mutex);
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24 local_source = NULL;
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25 do {
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26 if (!local_source) {
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27 local_source = source_buffer;
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28 source_buffer = NULL;
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29 SDL_CondSignal(output_ready);
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30 }
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31 if (!quitting && !local_source) {
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32 SDL_CondWait(source_ready, audio_mutex);
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33 }
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34 } while (!quitting && !local_source);
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35 local_quit = quitting;
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36 SDL_UnlockMutex(audio_mutex);
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37 if (!local_quit) {
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38 fflush(stdout);
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39 memcpy(stream, local_source, len);
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40 }
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41 }
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42
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43 static void close_audio()
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44 {
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45 SDL_LockMutex(audio_mutex);
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46 quitting = 1;
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47 SDL_CondSignal(source_ready);
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48 SDL_UnlockMutex(audio_mutex);
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49 SDL_CloseAudio();
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50 }
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51
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52 void system_present_audio(int16_t *buffer)
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53 {
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54 SDL_LockMutex(audio_mutex);
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55 while (source_buffer) {
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56 SDL_CondWait(output_ready, audio_mutex);
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57 }
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58 source_buffer = buffer;
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59 SDL_CondSignal(source_ready);
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60 SDL_UnlockMutex(audio_mutex);
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61 }
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62
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63 int system_sample_rate()
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64 {
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65 return sample_rate;
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66 }
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67
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68 int system_buffer_size()
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69 {
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70 return buffer_size;
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71 }
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72
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73 static int num_controllers;
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74 static SDL_GameController **game_controllers;
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75
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76 int system_init(int width, int height, int desired_sample_rate)
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77 {
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78 if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_GAMECONTROLLER) < 0) {
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79 fprintf(stderr, "Failed to init SDL: %s\n", SDL_GetError());
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80 return 0;
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81 }
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82 atexit(SDL_Quit);
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83 window = SDL_CreateWindow("simple16", 0, 0, width, height, 0);
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84 if (!window) {
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85 fprintf(stderr, "Failed to create window: %s\n", SDL_GetError());
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86 return 0;
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87 }
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88
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89 renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);
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90 if (!renderer) {
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91 fprintf(stderr, "Failed to create renderer: %s\n", SDL_GetError());
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92 goto renderer_error;
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93 }
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94
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95 texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_RGB444, SDL_TEXTUREACCESS_STREAMING, 320, 240);
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96 if (!texture) {
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97 fprintf(stderr, "Failed to create texture: %s\n", SDL_GetError());
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98 goto error;
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99 }
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100
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101 audio_mutex = SDL_CreateMutex();
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102 source_ready = SDL_CreateCond();
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103 output_ready = SDL_CreateCond();
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104
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105 SDL_AudioSpec desired, actual;
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106 desired.freq = desired_sample_rate;
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107 desired.format = AUDIO_S16SYS;
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108 desired.channels = 1;
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109 desired.callback = audio_callback;
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110 desired.userdata = NULL;
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111 desired.samples = 512;
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112
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113 if (SDL_OpenAudio(&desired, &actual) < 0) {
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114 fprintf(stderr, "Failed to open audio: %s\n", SDL_GetError());
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115 goto error;
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116 }
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117 printf("Initialized audio at frequency %d with a %d sample buffer and %d channels\n", actual.freq, actual.samples, actual.channels);
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118 sample_rate = actual.freq;
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119 buffer_size = actual.samples;
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120 atexit(close_audio);
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121 SDL_PauseAudio(0);
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122
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123 num_controllers = SDL_NumJoysticks();
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124 game_controllers = calloc(num_controllers, sizeof(*game_controllers));
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125
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126 for (int i = 0; i < num_controllers; i++)
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127 {
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128 if (!SDL_IsGameController(i)) {
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129 printf("Joystick %d: %s is not recognized as a controller by SDL2\n", i, SDL_JoystickNameForIndex(i));
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130 continue;
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131 }
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132 game_controllers[i] = SDL_GameControllerOpen(i);
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133 }
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134
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135 return 1;
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136
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137 error:
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138 SDL_DestroyRenderer(renderer);
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139 renderer_error:
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140 SDL_DestroyWindow(window);
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141 return 0;
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142 }
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143
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144 uint16_t *system_get_framebuffer(int *pitch)
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145 {
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146 void *pixels;
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147 if (SDL_LockTexture(texture, NULL, &pixels, pitch) < 0) {
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148 fprintf(stderr, "Failed to lock texture: %s\n", SDL_GetError());
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149 return NULL;
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150 }
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151 return pixels;
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152 }
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153
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154 void system_framebuffer_updated()
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155 {
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156 SDL_UnlockTexture(texture);
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157 SDL_RenderCopy(renderer, texture, NULL, NULL);
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158 SDL_RenderPresent(renderer);
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159 }
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160
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161 //SDL2 provides this, but only in 2.0.4+
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162 SDL_GameController *controller_by_id(SDL_JoystickID which)
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163 {
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164 for (int i = 0; i < num_controllers; i++)
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165 {
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166 if (!game_controllers[i]) {
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167 continue;
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168 }
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169 if (SDL_JoystickInstanceID(SDL_GameControllerGetJoystick(game_controllers[i])) == which) {
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170 return game_controllers[i];
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171 }
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172 }
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173 return NULL;
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174 }
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175
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176 static const uint16_t mapping[SDL_CONTROLLER_BUTTON_MAX] = {
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177 [SDL_CONTROLLER_BUTTON_LEFTSHOULDER] = 0x001,
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178 [SDL_CONTROLLER_BUTTON_Y] = 0x002,
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179 [SDL_CONTROLLER_BUTTON_X] = 0x004,
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180 [SDL_CONTROLLER_BUTTON_RIGHTSHOULDER] = 0x008,
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181 [SDL_CONTROLLER_BUTTON_B] = 0x010,
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182 [SDL_CONTROLLER_BUTTON_A] = 0x020,
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183 [SDL_CONTROLLER_BUTTON_BACK] = 0x040,
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184 [SDL_CONTROLLER_BUTTON_START] = 0x080,
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185 [SDL_CONTROLLER_BUTTON_DPAD_RIGHT] = 0x100,
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186 [SDL_CONTROLLER_BUTTON_DPAD_LEFT] = 0x200,
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187 [SDL_CONTROLLER_BUTTON_DPAD_DOWN] = 0x400,
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188 [SDL_CONTROLLER_BUTTON_DPAD_UP] = 0x800,
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189 };
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190
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191 static uint16_t keycode_to_bit(SDL_Keycode keycode)
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192 {
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193 switch(keycode)
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194 {
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195 case SDLK_a:
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196 return 0x020;
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197 case SDLK_s:
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198 return 0x010;
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199 case SDLK_d:
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200 return 0x008;
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201 case SDLK_q:
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202 return 0x004;
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203 case SDLK_w:
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204 return 0x002;
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205 case SDLK_e:
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206 return 0x001;
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207 case SDLK_f:
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208 return 0x040;
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209 case SDLK_RETURN:
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210 return 0x080;
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211 case SDLK_UP:
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212 return 0x800;
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213 case SDLK_DOWN:
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214 return 0x400;
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215 case SDLK_LEFT:
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216 return 0x200;
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217 case SDLK_RIGHT:
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218 return 0x100;
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219 }
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220 return 0;
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221 }
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222
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223 void system_poll_events()
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224 {
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225 SDL_Event event;
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226 while(SDL_PollEvent(&event))
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227 {
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228 switch (event.type)
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229 {
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230 case SDL_QUIT:
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231 exit(0);
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232 break;
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233 case SDL_CONTROLLERBUTTONDOWN:
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234 controller_pressed(event.cbutton.which, mapping[event.cbutton.button]);
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235 break;
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236 case SDL_CONTROLLERBUTTONUP:
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237 controller_released(event.cbutton.which, mapping[event.cbutton.button]);
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238 break;
38
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239 case SDL_KEYDOWN:
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240 controller_pressed(0, keycode_to_bit(event.key.keysym.sym));
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241 break;
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242 case SDL_KEYUP:
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243 controller_released(0, keycode_to_bit(event.key.keysym.sym));
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244 break;
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245 //TODO: Controller hotplug
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246 }
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247 }
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248 }
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249