src/video/cybergfx/SDL_cgxgl.c
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FUNCTIONS
This source file includes following functions.
- CGX_GL_GetVisual
- CGX_GL_CreateWindow
- CGX_GL_CreateContext
- CGX_GL_Shutdown
- CGX_GL_MakeCurrent
- CGX_GL_GetAttribute
- CGX_GL_SwapBuffers
- CGX_GL_UnloadLibrary
- CGX_GL_LoadLibrary
- CGX_GL_GetProcAddress
1 /*
2 SDL - Simple DirectMedia Layer
3 Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga
4
5 This library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Library General Public
7 License as published by the Free Software Foundation; either
8 version 2 of the License, or (at your option) any later version.
9
10 This library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Library General Public License for more details.
14
15 You should have received a copy of the GNU Library General Public
16 License along with this library; if not, write to the Free
17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18
19 Sam Lantinga
20 slouken@devolution.com
21 */
22
23 #ifdef SAVE_RCSID
24 static char rcsid =
25 "@(#) $Id: SDL_cgxgl.c,v 1.1.2.2 2001/02/10 07:20:06 hercules Exp $";
26 #endif
27
28 // #include <stdlib.h> /* For getenv() prototype */
29 // #include <string.h>
30
31 #include "SDL_events_c.h"
32 #include "SDL_error.h"
33 #include "SDL_cgxvideo.h"
34 #include "SDL_cgxgl_c.h"
35
36 #define DEFAULT_OPENGL "libGL.so.1"
37
38 /* return the preferred visual to use for openGL graphics */
39 void *CGX_GL_GetVisual(_THIS)
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40 {
41 #ifdef HAVE_OPENGL
42 /* 64 seems nice. */
43 int attribs[64];
44 int i;
45
46 /* load the gl driver from a default path */
47 if ( ! this->gl_config.driver_loaded ) {
48 /* no driver has been loaded, use default (ourselves) */
49 if ( X11_GL_LoadLibrary(this, NULL) < 0 ) {
50 return NULL;
51 }
52 }
53
54 /* See if we already have a window which we must use */
55 if ( SDL_windowid ) {
56 XWindowAttributes a;
57 XVisualInfo vi_in;
58 int out_count;
59
60 XGetWindowAttributes(SDL_Display, SDL_Window, &a);
61 vi_in.screen = SDL_Screen;
62 vi_in.visualid = XVisualIDFromVisual(a.visual);
63 glx_visualinfo = XGetVisualInfo(SDL_Display,
64 VisualScreenMask|VisualIDMask, &vi_in, &out_count);
65 return glx_visualinfo;
66 }
67
68 /* Setup our GLX attributes according to the gl_config. */
69 i = 0;
70 attribs[i++] = GLX_RGBA;
71 attribs[i++] = GLX_RED_SIZE;
72 attribs[i++] = this->gl_config.red_size;
73 attribs[i++] = GLX_GREEN_SIZE;
74 attribs[i++] = this->gl_config.green_size;
75 attribs[i++] = GLX_BLUE_SIZE;
76 attribs[i++] = this->gl_config.blue_size;
77
78 if( this->gl_config.alpha_size ) {
79 attribs[i++] = GLX_ALPHA_SIZE;
80 attribs[i++] = this->gl_config.alpha_size;
81 }
82
83 if( this->gl_config.buffer_size ) {
84 attribs[i++] = GLX_BUFFER_SIZE;
85 attribs[i++] = this->gl_config.buffer_size;
86 }
87
88 if( this->gl_config.double_buffer ) {
89 attribs[i++] = GLX_DOUBLEBUFFER;
90 }
91
92 attribs[i++] = GLX_DEPTH_SIZE;
93 attribs[i++] = this->gl_config.depth_size;
94
95 if( this->gl_config.stencil_size ) {
96 attribs[i++] = GLX_STENCIL_SIZE;
97 attribs[i++] = this->gl_config.stencil_size;
98 }
99
100 if( this->gl_config.accum_red_size ) {
101 attribs[i++] = GLX_ACCUM_RED_SIZE;
102 attribs[i++] = this->gl_config.accum_red_size;
103 }
104
105 if( this->gl_config.accum_green_size ) {
106 attribs[i++] = GLX_ACCUM_GREEN_SIZE;
107 attribs[i++] = this->gl_config.accum_green_size;
108 }
109
110 if( this->gl_config.accum_blue_size ) {
111 attribs[i++] = GLX_ACCUM_BLUE_SIZE;
112 attribs[i++] = this->gl_config.accum_blue_size;
113 }
114
115 if( this->gl_config.accum_alpha_size ) {
116 attribs[i++] = GLX_ACCUM_ALPHA_SIZE;
117 attribs[i++] = this->gl_config.accum_alpha_size;
118 }
119
120 attribs[i++] = None;
121
122 glx_visualinfo = this->gl_data->glXChooseVisual(GFX_Display,
123 SDL_Screen, attribs);
124 if( !glx_visualinfo ) {
125 SDL_SetError( "Couldn't find matching GLX visual");
126 return NULL;
127 }
128 return glx_visualinfo;
129 #else
130 SDL_SetError("CGX driver is not yet supporting OpenGL");
131 return NULL;
132 #endif
133 }
134
135 int CGX_GL_CreateWindow(_THIS, int w, int h)
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136 {
137 int retval;
138 #ifdef HAVE_OPENGL
139 XSetWindowAttributes attributes;
140 unsigned long mask;
141 unsigned long black;
142
143 black = (glx_visualinfo->visual == DefaultVisual(SDL_Display,
144 SDL_Screen))
145 ? BlackPixel(SDL_Display, SDL_Screen) : 0;
146 attributes.background_pixel = black;
147 attributes.border_pixel = black;
148 attributes.colormap = SDL_XColorMap;
149 mask = CWBackPixel | CWBorderPixel | CWColormap;
150
151 SDL_Window = XCreateWindow(SDL_Display, WMwindow,
152 0, 0, w, h, 0, glx_visualinfo->depth,
153 InputOutput, glx_visualinfo->visual,
154 mask, &attributes);
155 if ( !SDL_Window ) {
156 SDL_SetError("Could not create window");
157 return -1;
158 }
159 retval = 0;
160 #else
161 SDL_SetError("CGX driver is not yet supporting OpenGL");
162 retval = -1;
163 #endif
164 return(retval);
165 }
166
167 int CGX_GL_CreateContext(_THIS)
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168 {
169 int retval;
170 #ifdef HAVE_OPENGL
171 /* We do this to create a clean separation between X and GLX errors. */
172 XSync( SDL_Display, False );
173 glx_context = this->gl_data->glXCreateContext(GFX_Display,
174 glx_visualinfo, NULL, True);
175 XSync( GFX_Display, False );
176
177 if (glx_context == NULL) {
178 SDL_SetError("Could not create GL context");
179 return -1;
180 }
181
182 gl_active = 1;
183 #else
184 SDL_SetError("CGX driver is not yet supporting OpenGL");
185 #endif
186 if ( gl_active ) {
187 retval = 0;
188 } else {
189 retval = -1;
190 }
191 return(retval);
192 }
193
194 void CGX_GL_Shutdown(_THIS)
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195 {
196 #ifdef HAVE_OPENGL
197 /* Clean up OpenGL */
198 if( glx_context ) {
199 this->gl_data->glXMakeCurrent(GFX_Display, None, NULL);
200
201 if (glx_context != NULL)
202 this->gl_data->glXDestroyContext(GFX_Display, glx_context);
203
204 if( this->gl_data->glXReleaseBuffersMESA ) {
205 this->gl_data->glXReleaseBuffersMESA(GFX_Display,SDL_Window);
206 }
207 glx_context = NULL;
208 }
209 gl_active = 0;
210 #endif /* HAVE_OPENGL */
211 }
212
213 #ifdef HAVE_OPENGL
214
215 /* Make the current context active */
216 int CGX_GL_MakeCurrent(_THIS)
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217 {
218 int retval;
219
220 retval = 0;
221 if ( ! this->gl_data->glXMakeCurrent(GFX_Display,
222 SDL_Window, glx_context) ) {
223 SDL_SetError("Unable to make GL context current");
224 retval = -1;
225 }
226 XSync( GFX_Display, False );
227
228 /* More Voodoo X server workarounds... Grr... */
229 SDL_Lock_EventThread();
230 X11_CheckDGAMouse(this);
231 SDL_Unlock_EventThread();
232
233 return(retval);
234 }
235
236 /* Get attribute data from glX. */
237 int CGX_GL_GetAttribute(_THIS, SDL_GLattr attrib, int* value)
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238 {
239 int retval;
240 int glx_attrib = None;
241
242 switch( attrib ) {
243 case SDL_GL_RED_SIZE:
244 glx_attrib = GLX_RED_SIZE;
245 break;
246 case SDL_GL_GREEN_SIZE:
247 glx_attrib = GLX_GREEN_SIZE;
248 break;
249 case SDL_GL_BLUE_SIZE:
250 glx_attrib = GLX_BLUE_SIZE;
251 break;
252 case SDL_GL_ALPHA_SIZE:
253 glx_attrib = GLX_ALPHA_SIZE;
254 break;
255 case SDL_GL_DOUBLEBUFFER:
256 glx_attrib = GLX_DOUBLEBUFFER;
257 break;
258 case SDL_GL_BUFFER_SIZE:
259 glx_attrib = GLX_BUFFER_SIZE;
260 break;
261 case SDL_GL_DEPTH_SIZE:
262 glx_attrib = GLX_DEPTH_SIZE;
263 break;
264 case SDL_GL_STENCIL_SIZE:
265 glx_attrib = GLX_STENCIL_SIZE;
266 break;
267 case SDL_GL_ACCUM_RED_SIZE:
268 glx_attrib = GLX_ACCUM_RED_SIZE;
269 break;
270 case SDL_GL_ACCUM_GREEN_SIZE:
271 glx_attrib = GLX_ACCUM_GREEN_SIZE;
272 break;
273 case SDL_GL_ACCUM_BLUE_SIZE:
274 glx_attrib = GLX_ACCUM_BLUE_SIZE;
275 break;
276 case SDL_GL_ACCUM_ALPHA_SIZE:
277 glx_attrib = GLX_ACCUM_ALPHA_SIZE;
278 break;
279 default:
280 return(-1);
281 }
282
283 retval = this->gl_data->glXGetConfig(GFX_Display, glx_visualinfo, glx_attrib, value);
284
285 return retval;
286 }
287
288 void CGX_GL_SwapBuffers(_THIS)
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289 {
290 this->gl_data->glXSwapBuffers(GFX_Display, SDL_Window);
291 }
292
293 #endif /* HAVE_OPENGL */
294
295 void CGX_GL_UnloadLibrary(_THIS)
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296 {
297 #ifdef HAVE_OPENGL
298 if ( this->gl_config.driver_loaded ) {
299 dlclose(this->gl_config.dll_handle);
300
301 this->gl_data->glXChooseVisual = NULL;
302 this->gl_data->glXCreateContext = NULL;
303 this->gl_data->glXDestroyContext = NULL;
304 this->gl_data->glXMakeCurrent = NULL;
305 this->gl_data->glXSwapBuffers = NULL;
306
307 this->gl_config.dll_handle = NULL;
308 this->gl_config.driver_loaded = 0;
309 }
310 #endif
311 }
312
313 #ifdef HAVE_OPENGL
314
315 /* Passing a NULL path means load pointers from the application */
316 int CGX_GL_LoadLibrary(_THIS, const char* path)
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317 {
318 void* handle;
319 int dlopen_flags;
320
321 if ( gl_active ) {
322 SDL_SetError("OpenGL context already created");
323 return -1;
324 }
325
326 #ifdef RTLD_GLOBAL
327 dlopen_flags = RTLD_LAZY | RTLD_GLOBAL;
328 #else
329 dlopen_flags = RTLD_LAZY;
330 #endif
331 handle = dlopen(path, dlopen_flags);
332 /* Catch the case where the application isn't linked with GL */
333 if ( (dlsym(handle, "glXChooseVisual") == NULL) && (path == NULL) ) {
334 dlclose(handle);
335 path = getenv("SDL_VIDEO_GL_DRIVER");
336 if ( path == NULL ) {
337 path = DEFAULT_OPENGL;
338 }
339 handle = dlopen(path, dlopen_flags);
340 }
341 if ( handle == NULL ) {
342 SDL_SetError("Could not load OpenGL library");
343 return -1;
344 }
345
346 /* Unload the old driver and reset the pointers */
347 X11_GL_UnloadLibrary(this);
348
349 /* Load new function pointers */
350 this->gl_data->glXChooseVisual = dlsym(handle, "glXChooseVisual");
351 this->gl_data->glXCreateContext = dlsym(handle, "glXCreateContext");
352 this->gl_data->glXDestroyContext = dlsym(handle, "glXDestroyContext");
353 this->gl_data->glXMakeCurrent = dlsym(handle, "glXMakeCurrent");
354 this->gl_data->glXSwapBuffers = dlsym(handle, "glXSwapBuffers");
355 this->gl_data->glXGetConfig = dlsym(handle, "glXGetConfig");
356 /* We don't compare below for this in case we're not using Mesa. */
357 this->gl_data->glXReleaseBuffersMESA = dlsym( handle, "glXReleaseBuffersMESA" );
358
359 if ( (this->gl_data->glXChooseVisual == NULL) ||
360 (this->gl_data->glXCreateContext == NULL) ||
361 (this->gl_data->glXDestroyContext == NULL) ||
362 (this->gl_data->glXMakeCurrent == NULL) ||
363 (this->gl_data->glXSwapBuffers == NULL) ||
364 (this->gl_data->glXGetConfig == NULL) ) {
365 SDL_SetError("Could not retrieve OpenGL functions");
366 return -1;
367 }
368
369 this->gl_config.dll_handle = handle;
370 this->gl_config.driver_loaded = 1;
371 if ( path ) {
372 strncpy(this->gl_config.driver_path, path,
373 sizeof(this->gl_config.driver_path)-1);
374 } else {
375 strcpy(this->gl_config.driver_path, "");
376 }
377 return 0;
378 }
379
380 void *CGX_GL_GetProcAddress(_THIS, const char* proc)
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381 {
382 void* handle;
383
384 handle = this->gl_config.dll_handle;
385
386 return dlsym(handle, proc);
387 }
388
389 #endif /* HAVE_OPENGL */