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/>.
24 #include "../../include/keycodes.h"
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 retry_without_multisampling:
67 if (multisampling > 1) {
68 SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 8);
69 SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 8);
70 SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 8);
71 SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, 8);
72 SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 24);
73 SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS, 1);
74 SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, multisampling);
78 gl_window = SDL_CreateWindow(progname, SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, width, height, SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE);
81 print_info("Failed to open SDL window: %s (retrying without multisampling)\n", SDL_GetError());
82 SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS, 0);
83 SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, 0);
85 goto retry_without_multisampling;
87 print_error("Failed to open SDL window: %s\n", SDL_GetError());
88 SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS, 1);
89 SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, multisampling);
94 /* create GL context */
95 gl_context = SDL_GL_CreateContext(gl_window);
97 print_error("Failed to create SDL's OpenGL context: %s\n", SDL_GetError());
102 rc = SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
104 print_error("Failed to set SDL's OpenGL context profile\n");
108 rc = SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 3);
110 print_error("Failed to set SDL's OpenGL major version\n");
113 rc = SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 2);
115 print_error("Failed to set SDL's OpenGL minor version\n");
119 rc = SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
121 print_error("Failed to set SDL's OpenGL doublebuffer\n");
125 rc = SDL_GL_SetSwapInterval((vbl_sync) ? 1 : 0);
127 print_error("Failed to set SDL's OpenGL swap interval to VBLANK\n");
131 // seems like a hack to me. do we need this?
134 glewExperimental = GL_TRUE;
135 if (glewInit() != GLEW_OK) {
136 print_error("Failed to init GLEW\n");
143 glDisable(GL_DEPTH_TEST);
144 glDisable(GL_CULL_FACE);
145 if (multisampling > 1)
146 glEnable(GL_MULTISAMPLE);
150 count = SDL_GetNumAudioDevices(0);
152 for(i = 0; i < count; i++) {
153 string = SDL_GetAudioDeviceName(i, 0);
154 if (strstr(string, "Rift"))
155 device_string = string;
158 print_error("Oculus Rift headset not found, falling back to default audio device.\n");
162 SDL_AudioSpec want, have;
163 SDL_memset(&want, 0, sizeof(want)); /* or SDL_zero(want) */
164 want.freq = sound_samplerate;
165 want.format = AUDIO_F32; /* we always use float in this project */
167 want.samples = sound_chunk; /* must be a power of two */
168 want.callback = audio_cb;
169 audio_devid = SDL_OpenAudioDevice(device_string, 0, &want, &have, SDL_AUDIO_ALLOW_ANY_CHANGE);
170 if (audio_devid <= 0) {
171 print_error("Failed to open audio! (No speaker connected?)\n");
174 } else if (have.format != want.format) {
175 print_error("Failed to open audio with desired audio format (want %d, got %d)\n", want.format, have.format);
178 } else if (have.freq != want.freq) {
179 print_error("Failed to open audio with desired sample rate (want %d, got %d)\n", want.freq, have.freq);
182 } else if (have.channels != want.channels) {
183 print_error("Failed to open audio with desired number of channels (want %d, got %d)\n", want.channels, have.channels);
187 SDL_PauseAudioDevice(audio_devid, 0);
188 audio_initialized = 1;
198 static enum keycode sdl2keycode(SDL_Keycode sym)
201 case SDLK_LCTRL: return KEYCODE_LCTRL;
202 case SDLK_RCTRL: return KEYCODE_RCTRL;
203 case SDLK_LSHIFT: return KEYCODE_LSHIFT;
204 case SDLK_RSHIFT: return KEYCODE_RSHIFT;
205 case SDLK_LALT: return KEYCODE_LALT;
206 case SDLK_RALT: return KEYCODE_RALT;
207 case SDLK_PAUSE: return KEYCODE_PAUSE;
208 case SDLK_LEFT: return KEYCODE_LEFT;
209 case SDLK_RIGHT: return KEYCODE_RIGHT;
210 case SDLK_UP: return KEYCODE_UP;
211 case SDLK_DOWN: return KEYCODE_DOWN;
212 case SDLK_END: return KEYCODE_END;
213 case SDLK_a: return KEYCODE_a;
214 case SDLK_b: return KEYCODE_b;
215 case SDLK_c: return KEYCODE_c;
216 case SDLK_d: return KEYCODE_d;
217 case SDLK_e: return KEYCODE_e;
218 case SDLK_f: return KEYCODE_f;
219 case SDLK_g: return KEYCODE_g;
220 case SDLK_h: return KEYCODE_h;
221 case SDLK_i: return KEYCODE_i;
222 case SDLK_j: return KEYCODE_j;
223 case SDLK_k: return KEYCODE_k;
224 case SDLK_l: return KEYCODE_l;
225 case SDLK_m: return KEYCODE_m;
226 case SDLK_n: return KEYCODE_n;
227 case SDLK_o: return KEYCODE_o;
228 case SDLK_p: return KEYCODE_p;
229 case SDLK_q: return KEYCODE_q;
230 case SDLK_r: return KEYCODE_r;
231 case SDLK_s: return KEYCODE_s;
232 case SDLK_t: return KEYCODE_t;
233 case SDLK_u: return KEYCODE_u;
234 case SDLK_v: return KEYCODE_v;
235 case SDLK_w: return KEYCODE_w;
236 case SDLK_x: return KEYCODE_x;
237 case SDLK_y: return KEYCODE_y;
238 case SDLK_z: return KEYCODE_z;
239 case SDLK_0: return KEYCODE_0;
240 case SDLK_1: return KEYCODE_1;
241 case SDLK_2: return KEYCODE_2;
242 case SDLK_3: return KEYCODE_3;
243 case SDLK_4: return KEYCODE_4;
244 case SDLK_5: return KEYCODE_5;
245 case SDLK_6: return KEYCODE_6;
246 case SDLK_7: return KEYCODE_7;
247 case SDLK_8: return KEYCODE_8;
248 case SDLK_9: return KEYCODE_9;
249 case SDLK_KP_0: return KEYCODE_KP_0;
250 case SDLK_KP_1: return KEYCODE_KP_1;
251 case SDLK_KP_2: return KEYCODE_KP_2;
252 case SDLK_KP_3: return KEYCODE_KP_3;
253 case SDLK_KP_4: return KEYCODE_KP_4;
254 case SDLK_KP_5: return KEYCODE_KP_5;
255 case SDLK_KP_6: return KEYCODE_KP_6;
256 case SDLK_KP_7: return KEYCODE_KP_7;
257 case SDLK_KP_8: return KEYCODE_KP_8;
258 case SDLK_KP_9: return KEYCODE_KP_9;
259 case SDLK_KP_DIVIDE: return KEYCODE_KP_DIVIDE;
260 case SDLK_KP_MULTIPLY: return KEYCODE_KP_MULTIPLY;
261 case SDLK_KP_MINUS: return KEYCODE_KP_MINUS;
262 case SDLK_KP_PLUS: return KEYCODE_KP_PLUS;
263 case SDLK_KP_PERIOD: return KEYCODE_KP_PERIOD;
264 case SDLK_KP_ENTER: return KEYCODE_KP_ENTER;
265 case SDLK_F1: return KEYCODE_F1;
266 case SDLK_F2: return KEYCODE_F2;
267 case SDLK_F3: return KEYCODE_F3;
268 case SDLK_F4: return KEYCODE_F4;
269 case SDLK_F5: return KEYCODE_F5;
270 case SDLK_F6: return KEYCODE_F6;
271 case SDLK_F7: return KEYCODE_F7;
272 case SDLK_F8: return KEYCODE_F8;
273 case SDLK_F9: return KEYCODE_F9;
274 case SDLK_F10: return KEYCODE_F10;
275 case SDLK_SPACE: return KEYCODE_SPACE;
276 case SDLK_BACKSPACE: return KEYCODE_BACKSPACE;
277 case SDLK_TAB: return KEYCODE_TAB;
278 case SDLK_RETURN: return KEYCODE_RETURN;
279 case SDLK_ESCAPE: return KEYCODE_ESCAPE;
280 case SDLK_DELETE: return KEYCODE_DELETE;
281 case SDLK_INSERT: return KEYCODE_INSERT;
282 case SDLK_COMMA: return KEYCODE_COMMA;
283 case SDLK_PERIOD: return KEYCODE_PERIOD;
284 default: return KEYCODE_UNDEFINED;
288 static int key_ctrl = 0, key_f = 0, fullscreen = 0;
295 while (SDL_PollEvent(&event)) {
296 if (event.type == SDL_QUIT)
298 if (event.type == SDL_WINDOWEVENT) {
299 if (event.window.event == SDL_WINDOWEVENT_SIZE_CHANGED)
300 resize_window_sdl(event.window.data1, event.window.data2);
302 if (event.type == SDL_KEYDOWN) {
303 switch (event.key.keysym.sym) {
305 if (key_ctrl && !key_f) {
308 SDL_SetWindowFullscreen(gl_window, 0);
309 SDL_ShowCursor(SDL_ENABLE);
311 SDL_SetWindowFullscreen(gl_window, SDL_WINDOW_FULLSCREEN_DESKTOP);
312 SDL_ShowCursor(SDL_DISABLE);
323 keyboard_sdl(1, sdl2keycode(event.key.keysym.sym));
325 if (event.type == SDL_KEYUP) {
326 switch (event.key.keysym.sym) {
335 keyboard_sdl(0, sdl2keycode(event.key.keysym.sym));
344 SDL_GL_SwapWindow(gl_window);
351 SDL_DestroyWindow(gl_window);
355 /* clear OpenGL context */
357 SDL_GL_DeleteContext(gl_context);
361 /* exit SDL library */
362 if (audio_initialized) {
363 SDL_PauseAudioDevice(audio_devid, 1);
364 audio_initialized = 0;
366 if (audio_devid > 0) {
367 SDL_CloseAudioDevice(audio_devid);
370 if (sdl_initialized) {
376 uint32_t ticks_sdl(void)
378 return SDL_GetTicks();