2 * Copyright (C) 2003 Robert Kooima
4 * NEVERBALL is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published
6 * by the Free Software Foundation; either version 2 of the License,
7 * or (at your option) any later version.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
21 /*---------------------------------------------------------------------------*/
23 int video_init(const char *title, const char *icon)
25 /* Require 16-bit double buffer with 16-bit depth buffer. */
27 SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 5);
28 SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 5);
29 SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 5);
30 SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 16);
31 SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
33 /* This has to happen before mode setting... */
37 /* Initialize the video. */
39 if (!video_mode(config_get_d(CONFIG_FULLSCREEN),
40 config_get_d(CONFIG_WIDTH), config_get_d(CONFIG_HEIGHT)))
42 fprintf(stderr, "%s\n", SDL_GetError());
46 /* ...and this has to happen after it. */
50 SDL_WM_SetCaption(title, title);
55 /*---------------------------------------------------------------------------*/
57 int check_extension(const char *needle)
59 const GLubyte *haystack, *c;
61 /* Search for the given string in the OpenGL extension strings. */
63 for (haystack = glGetString(GL_EXTENSIONS); *haystack; haystack++)
65 for (c = (const GLubyte *) needle; *c && *haystack; c++, haystack++)
69 if ((*c == 0) && (*haystack == ' ' || *haystack == '\0'))
76 int video_mode(int f, int w, int h)
78 int stereo = config_get_d(CONFIG_STEREO) ? 1 : 0;
79 int stencil = config_get_d(CONFIG_REFLECTION) ? 1 : 0;
80 int buffers = config_get_d(CONFIG_MULTISAMPLE) ? 1 : 0;
81 int samples = config_get_d(CONFIG_MULTISAMPLE);
82 int vsync = config_get_d(CONFIG_VSYNC) ? 1 : 0;
84 SDL_GL_SetAttribute(SDL_GL_STEREO, stereo);
85 SDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE, stencil);
86 SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS, buffers);
87 SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, samples);
88 SDL_GL_SetAttribute(SDL_GL_SWAP_CONTROL, vsync);
90 /* Try to set the currently specified mode. */
92 if (SDL_SetVideoMode(w, h, 0, SDL_OPENGL | (f ? SDL_FULLSCREEN : 0)))
94 config_set_d(CONFIG_FULLSCREEN, f);
95 config_set_d(CONFIG_WIDTH, w);
96 config_set_d(CONFIG_HEIGHT, h);
98 glViewport(0, 0, w, h);
99 glClearColor(0.0f, 0.0f, 0.1f, 0.0f);
101 glEnable(GL_NORMALIZE);
102 glEnable(GL_CULL_FACE);
103 glEnable(GL_DEPTH_TEST);
104 glEnable(GL_TEXTURE_2D);
105 glEnable(GL_LIGHTING);
108 glLightModeli(GL_LIGHT_MODEL_COLOR_CONTROL,
109 GL_SEPARATE_SPECULAR_COLOR);
110 glLightModeli(GL_LIGHT_MODEL_LOCAL_VIEWER, 1);
112 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
113 glDepthFunc(GL_LEQUAL);
116 * Mac OS X might still need this, because apparently SDL doesn't do
117 * SDL_GL_SWAP_CONTROL on OS X. TODO: investigate.
120 if (vsync) sync_init();
123 /* If GL supports multisample, and SDL got a multisample buffer... */
125 #ifdef GL_ARB_multisample
126 if (check_extension("ARB_multisample"))
128 SDL_GL_GetAttribute(SDL_GL_MULTISAMPLEBUFFERS, &buffers);
130 glEnable(GL_MULTISAMPLE_ARB);
137 /* If the mode failed, try it without stereo. */
141 config_set_d(CONFIG_STEREO, 0);
142 return video_mode(f, w, h);
145 /* If the mode failed, try decreasing the level of multisampling. */
149 config_set_d(CONFIG_MULTISAMPLE, samples / 2);
150 return video_mode(f, w, h);
153 /* If that mode failed, try it without reflections. */
157 config_set_d(CONFIG_REFLECTION, 0);
158 return video_mode(f, w, h);
161 /* If THAT mode failed, punt. */
166 /*---------------------------------------------------------------------------*/
171 static int ticks = 0;
172 static int frames = 0;
179 void video_swap(void)
183 SDL_GL_SwapBuffers();
185 /* Accumulate time passed and frames rendered. */
187 dt = (int) SDL_GetTicks() - last;
193 /* Average over 250ms. */
197 /* Round the frames-per-second value to the nearest integer. */
199 double k = 1000.0 * frames / ticks;
203 /* Compute frame time and frames-per-second stats. */
205 fps = (int) ((c - k < k - f) ? c : f);
206 ms = (float) ticks / (float) frames;
208 /* Reset the counters for the next update. */
213 /* Output statistics if configured. */
215 if (config_get_d(CONFIG_STATS))
216 fprintf(stdout, "%4d %8.4f\n", fps, ms);
220 /*---------------------------------------------------------------------------*/
222 static int grabbed = 0;
224 void video_set_grab(int w)
228 SDL_EventState(SDL_MOUSEMOTION, SDL_IGNORE);
230 SDL_WarpMouse(config_get_d(CONFIG_WIDTH) / 2,
231 config_get_d(CONFIG_HEIGHT) / 2);
233 SDL_EventState(SDL_MOUSEMOTION, SDL_ENABLE);
236 SDL_WM_GrabInput(SDL_GRAB_ON);
237 SDL_ShowCursor(SDL_DISABLE);
242 void video_clr_grab(void)
244 SDL_WM_GrabInput(SDL_GRAB_OFF);
245 SDL_ShowCursor(SDL_ENABLE);
249 int video_get_grab(void)
254 /*---------------------------------------------------------------------------*/
256 void video_push_persp(float fov, float n, float f)
260 GLdouble r = fov / 2 * V_PI / 180;
262 GLdouble c = cos(r) / s;
264 GLdouble a = ((GLdouble) config_get_d(CONFIG_WIDTH) /
265 (GLdouble) config_get_d(CONFIG_HEIGHT));
267 glMatrixMode(GL_PROJECTION);
282 m[2][2] = -(f + n) / (f - n);
286 m[3][2] = -2.0 * n * f / (f - n);
289 glMultMatrixd(&m[0][0]);
291 glMatrixMode(GL_MODELVIEW);
294 void video_push_ortho(void)
296 GLdouble w = (GLdouble) config_get_d(CONFIG_WIDTH);
297 GLdouble h = (GLdouble) config_get_d(CONFIG_HEIGHT);
299 glMatrixMode(GL_PROJECTION);
303 glOrtho(0.0, w, 0.0, h, -1.0, +1.0);
305 glMatrixMode(GL_MODELVIEW);
308 void video_pop_matrix(void)
310 glMatrixMode(GL_PROJECTION);
314 glMatrixMode(GL_MODELVIEW);
317 void video_clear(void)
319 if (config_get_d(CONFIG_REFLECTION))
320 glClear(GL_COLOR_BUFFER_BIT |
321 GL_DEPTH_BUFFER_BIT |
322 GL_STENCIL_BUFFER_BIT);
324 glClear(GL_COLOR_BUFFER_BIT |
325 GL_DEPTH_BUFFER_BIT);
328 /*---------------------------------------------------------------------------*/