3 * (C) 2018 by Andreas Eversberg <jolly@eversberg.eu>
6 * This program is free software: you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation, either version 3 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program. If not, see <http://www.gnu.org/licenses/>.
28 #define GL3_PROTOTYPES 1
31 static int sdl_initialized = 0;
32 static int audio_initialized = 0;
33 static const char *device_string = NULL;
34 static SDL_AudioDeviceID audio_devid = 0;
35 static SDL_Window *gl_window = NULL;
36 static SDL_GLContext gl_context = NULL;
37 static void (*keyboard_sdl)(int down, enum keycode keycode) = NULL;
38 static void (*audio_sdl)(float *data, int len) = NULL;
39 static void (*resize_window_sdl)(int width, int height) = NULL;
41 static void audio_cb(void __attribute__((unused)) *userdata, Uint8 *stream, int len)
43 float audio_data[len / sizeof(float)];
45 SDL_memset(stream, 0, len);
46 audio_sdl(audio_data, len / sizeof(float) / 2);
47 SDL_MixAudioFormat(stream, (Uint8 *)audio_data, AUDIO_F32, len, SDL_MIX_MAXVOLUME / 2.0);
50 int init_sdl(const char *progname, int width, int height, int sound_samplerate, int sound_chunk, void (*keyboard)(int down, enum keycode keycode), void (*audio)(float *data, int len), void (*resize_window)(int width, int height), int multisampling, int vbl_sync, int rift)
54 keyboard_sdl = keyboard;
56 resize_window_sdl = resize_window;
58 /* init SDL library */
59 rc = SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO);
61 print_error("Failed to init SDL\n");
66 if (multisampling > 1) {
67 SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 8);
68 SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 8);
69 SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 8);
70 SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, 8);
71 SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 24);
72 SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS, 1);
73 SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, multisampling);
77 gl_window = SDL_CreateWindow(progname, SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, width, height, SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE);
79 print_error("Failed to open SDL window: %s (try without multisampling)\n", SDL_GetError());
84 /* create GL context */
85 gl_context = SDL_GL_CreateContext(gl_window);
87 print_error("Failed to create SDL's OpenGL context: %s\n", SDL_GetError());
92 rc = SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
94 print_error("Failed to set SDL's OpenGL context profile\n");
98 rc = SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
100 print_error("Failed to set SDL's OpenGL major version\n");
103 rc = SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 2);
105 print_error("Failed to set SDL's OpenGL minor version\n");
109 rc = SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
111 print_error("Failed to set SDL's OpenGL doublebuffer\n");
115 rc = SDL_GL_SetSwapInterval((vbl_sync) ? 1 : 0);
117 print_error("Failed to set SDL's OpenGL swap interval to VBLANK\n");
121 // seems like a hack to me. do we need this?
124 glewExperimental = GL_TRUE;
125 if (glewInit() != GLEW_OK) {
126 print_error("Failed to init GLEW\n");
133 glDisable(GL_DEPTH_TEST);
134 glDisable(GL_CULL_FACE);
135 if (multisampling > 1)
136 glEnable(GL_MULTISAMPLE);
140 count = SDL_GetNumAudioDevices(0);
142 for(i = 0; i < count; i++) {
143 string = SDL_GetAudioDeviceName(i, 0);
144 if (strstr(string, "Rift"))
145 device_string = string;
148 print_error("Oculus Rift headset not found, falling back to default audio device.\n");
152 SDL_AudioSpec want, have;
153 SDL_memset(&want, 0, sizeof(want)); /* or SDL_zero(want) */
154 want.freq = sound_samplerate;
155 want.format = AUDIO_F32; /* we always use float in this project */
157 want.samples = sound_chunk; /* must be a power of two */
158 want.callback = audio_cb;
159 audio_devid = SDL_OpenAudioDevice(device_string, 0, &want, &have, SDL_AUDIO_ALLOW_ANY_CHANGE);
160 if (audio_devid <= 0) {
161 print_error("Failed to open audio! (No speaker connected?)\n");
164 } else if (have.format != want.format) {
165 print_error("Failed to open audio with desired audio format (want %d, got %d)\n", want.format, have.format);
168 } else if (have.freq != want.freq) {
169 print_error("Failed to open audio with desired sample rate (want %d, got %d)\n", want.freq, have.freq);
172 } else if (have.channels != want.channels) {
173 print_error("Failed to open audio with desired number of channels (want %d, got %d)\n", want.channels, have.channels);
177 SDL_PauseAudioDevice(audio_devid, 0);
178 audio_initialized = 1;
188 static enum keycode sdl2keycode(SDL_Keycode sym)
191 case SDLK_LCTRL: return KEYCODE_LCTRL;
192 case SDLK_RCTRL: return KEYCODE_RCTRL;
193 case SDLK_LSHIFT: return KEYCODE_LSHIFT;
194 case SDLK_RSHIFT: return KEYCODE_RSHIFT;
195 case SDLK_PAUSE: return KEYCODE_PAUSE;
196 case SDLK_LEFT: return KEYCODE_LEFT;
197 case SDLK_RIGHT: return KEYCODE_RIGHT;
198 case SDLK_UP: return KEYCODE_UP;
199 case SDLK_DOWN: return KEYCODE_DOWN;
200 case SDLK_END: return KEYCODE_END;
201 case SDLK_a: return KEYCODE_a;
202 case SDLK_b: return KEYCODE_b;
203 case SDLK_c: return KEYCODE_c;
204 case SDLK_d: return KEYCODE_d;
205 case SDLK_e: return KEYCODE_e;
206 case SDLK_f: return KEYCODE_f;
207 case SDLK_g: return KEYCODE_g;
208 case SDLK_h: return KEYCODE_h;
209 case SDLK_i: return KEYCODE_i;
210 case SDLK_j: return KEYCODE_j;
211 case SDLK_k: return KEYCODE_k;
212 case SDLK_l: return KEYCODE_l;
213 case SDLK_m: return KEYCODE_m;
214 case SDLK_n: return KEYCODE_n;
215 case SDLK_o: return KEYCODE_o;
216 case SDLK_p: return KEYCODE_p;
217 case SDLK_q: return KEYCODE_q;
218 case SDLK_r: return KEYCODE_r;
219 case SDLK_s: return KEYCODE_s;
220 case SDLK_t: return KEYCODE_t;
221 case SDLK_u: return KEYCODE_u;
222 case SDLK_v: return KEYCODE_v;
223 case SDLK_w: return KEYCODE_w;
224 case SDLK_x: return KEYCODE_x;
225 case SDLK_y: return KEYCODE_y;
226 case SDLK_z: return KEYCODE_z;
227 case SDLK_0: return KEYCODE_0;
228 case SDLK_1: return KEYCODE_1;
229 case SDLK_2: return KEYCODE_2;
230 case SDLK_3: return KEYCODE_3;
231 case SDLK_4: return KEYCODE_4;
232 case SDLK_5: return KEYCODE_5;
233 case SDLK_6: return KEYCODE_6;
234 case SDLK_7: return KEYCODE_7;
235 case SDLK_8: return KEYCODE_8;
236 case SDLK_9: return KEYCODE_9;
237 case SDLK_KP_0: return KEYCODE_KP_0;
238 case SDLK_KP_1: return KEYCODE_KP_1;
239 case SDLK_KP_2: return KEYCODE_KP_2;
240 case SDLK_KP_3: return KEYCODE_KP_3;
241 case SDLK_KP_4: return KEYCODE_KP_4;
242 case SDLK_KP_5: return KEYCODE_KP_5;
243 case SDLK_KP_6: return KEYCODE_KP_6;
244 case SDLK_KP_7: return KEYCODE_KP_7;
245 case SDLK_KP_8: return KEYCODE_KP_8;
246 case SDLK_KP_9: return KEYCODE_KP_9;
247 case SDLK_KP_DIVIDE: return KEYCODE_KP_DIVIDE;
248 case SDLK_KP_MULTIPLY: return KEYCODE_KP_MULTIPLY;
249 case SDLK_KP_MINUS: return KEYCODE_KP_MINUS;
250 case SDLK_KP_PLUS: return KEYCODE_KP_PLUS;
251 case SDLK_KP_PERIOD: return KEYCODE_KP_PERIOD;
252 case SDLK_F1: return KEYCODE_F1;
253 case SDLK_F2: return KEYCODE_F2;
254 case SDLK_F3: return KEYCODE_F3;
255 case SDLK_F4: return KEYCODE_F4;
256 case SDLK_F5: return KEYCODE_F5;
257 case SDLK_F6: return KEYCODE_F6;
258 case SDLK_F7: return KEYCODE_F7;
259 case SDLK_F8: return KEYCODE_F8;
260 case SDLK_F9: return KEYCODE_F9;
261 case SDLK_F10: return KEYCODE_F10;
262 case SDLK_SPACE: return KEYCODE_SPACE;
263 case SDLK_BACKSPACE: return KEYCODE_BACKSPACE;
264 case SDLK_TAB: return KEYCODE_TAB;
265 case SDLK_KP_ENTER: return KEYCODE_KP_ENTER;
266 case SDLK_RETURN: return KEYCODE_RETURN;
267 case SDLK_ESCAPE: return KEYCODE_ESCAPE;
268 case SDLK_DELETE: return KEYCODE_DELETE;
269 case SDLK_INSERT: return KEYCODE_INSERT;
270 default: return KEYCODE_UNDEFINED;
274 static int key_ctrl = 0, key_f = 0, fullscreen = 0;
281 while (SDL_PollEvent(&event)) {
282 if (event.type == SDL_QUIT)
284 if (event.type == SDL_WINDOWEVENT) {
285 if (event.window.event == SDL_WINDOWEVENT_SIZE_CHANGED)
286 resize_window_sdl(event.window.data1, event.window.data2);
288 if (event.type == SDL_KEYDOWN) {
289 switch (event.key.keysym.sym) {
291 if (key_ctrl && !key_f) {
294 SDL_SetWindowFullscreen(gl_window, 0);
295 SDL_ShowCursor(SDL_ENABLE);
297 SDL_SetWindowFullscreen(gl_window, SDL_WINDOW_FULLSCREEN_DESKTOP);
298 SDL_ShowCursor(SDL_DISABLE);
309 keyboard_sdl(1, sdl2keycode(event.key.keysym.sym));
311 if (event.type == SDL_KEYUP) {
312 switch (event.key.keysym.sym) {
321 keyboard_sdl(0, sdl2keycode(event.key.keysym.sym));
330 SDL_GL_SwapWindow(gl_window);
337 SDL_DestroyWindow(gl_window);
341 /* clear OpenGL context */
343 SDL_GL_DeleteContext(gl_context);
347 /* exit SDL library */
348 if (audio_initialized) {
349 SDL_PauseAudioDevice(audio_devid, 1);
350 audio_initialized = 0;
352 if (audio_devid > 0) {
353 SDL_CloseAudioDevice(audio_devid);
356 if (sdl_initialized) {
362 uint32_t ticks_sdl(void)
364 return SDL_GetTicks();