Mercurial > sdl-ios-xcode
annotate src/video/x11/SDL_x11gl.c @ 1191:2bd4cec0de63
Seperate glX from HAVE_OPENGL, for platforms that have both an X server and
a more official way to do OpenGL, explicitly check for glX on Mac OS X, and
use SDL_LoadObject for platforms that have glX but don't have dlopen().
author | Ryan C. Gordon <icculus@icculus.org> |
---|---|
date | Wed, 23 Nov 2005 11:46:36 +0000 |
parents | e8e8dcb68e7a |
children | b81f54c3963f |
rev | line source |
---|---|
0 | 1 /* |
2 SDL - Simple DirectMedia Layer | |
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Updated copyright information for 2004 (Happy New Year!)
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3 Copyright (C) 1997-2004 Sam Lantinga |
0 | 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 | |
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20 slouken@libsdl.org |
0 | 21 */ |
22 | |
23 #ifdef SAVE_RCSID | |
24 static char rcsid = | |
25 "@(#) $Id$"; | |
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_x11video.h" | |
34 #include "SDL_x11dga_c.h" | |
35 #include "SDL_x11gl_c.h" | |
36 | |
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37 #if defined(sgi) |
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38 /* IRIX doesn't have a GL library versioning system */ |
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39 #define DEFAULT_OPENGL "libGL.so" |
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40 #elif defined(MACOSX) |
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41 #define DEFAULT_OPENGL "/usr/X11R6/lib/libGL.1.dylib" |
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42 #else |
0 | 43 #define DEFAULT_OPENGL "libGL.so.1" |
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44 #endif |
0 | 45 |
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46 #ifndef GLX_ARB_multisample |
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47 #define GLX_ARB_multisample |
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48 #define GLX_SAMPLE_BUFFERS_ARB 100000 |
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49 #define GLX_SAMPLES_ARB 100001 |
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50 #endif |
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51 |
0 | 52 /* return the preferred visual to use for openGL graphics */ |
53 XVisualInfo *X11_GL_GetVisual(_THIS) | |
54 { | |
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55 #ifdef HAVE_OPENGL_X11 |
0 | 56 /* 64 seems nice. */ |
57 int attribs[64]; | |
58 int i; | |
59 | |
60 /* load the gl driver from a default path */ | |
61 if ( ! this->gl_config.driver_loaded ) { | |
62 /* no driver has been loaded, use default (ourselves) */ | |
63 if ( X11_GL_LoadLibrary(this, NULL) < 0 ) { | |
64 return NULL; | |
65 } | |
66 } | |
67 | |
68 /* See if we already have a window which we must use */ | |
69 if ( SDL_windowid ) { | |
70 XWindowAttributes a; | |
71 XVisualInfo vi_in; | |
72 int out_count; | |
73 | |
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74 pXGetWindowAttributes(SDL_Display, SDL_Window, &a); |
0 | 75 vi_in.screen = SDL_Screen; |
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76 vi_in.visualid = pXVisualIDFromVisual(a.visual); |
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77 glx_visualinfo = pXGetVisualInfo(SDL_Display, |
0 | 78 VisualScreenMask|VisualIDMask, &vi_in, &out_count); |
79 return glx_visualinfo; | |
80 } | |
81 | |
82 /* Setup our GLX attributes according to the gl_config. */ | |
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83 i = 0; |
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84 attribs[i++] = GLX_RGBA; |
0 | 85 attribs[i++] = GLX_RED_SIZE; |
86 attribs[i++] = this->gl_config.red_size; | |
87 attribs[i++] = GLX_GREEN_SIZE; | |
88 attribs[i++] = this->gl_config.green_size; | |
89 attribs[i++] = GLX_BLUE_SIZE; | |
90 attribs[i++] = this->gl_config.blue_size; | |
91 | |
92 if( this->gl_config.alpha_size ) { | |
93 attribs[i++] = GLX_ALPHA_SIZE; | |
94 attribs[i++] = this->gl_config.alpha_size; | |
95 } | |
96 | |
97 if( this->gl_config.buffer_size ) { | |
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98 attribs[i++] = GLX_BUFFER_SIZE; |
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99 attribs[i++] = this->gl_config.buffer_size; |
0 | 100 } |
101 | |
102 if( this->gl_config.double_buffer ) { | |
103 attribs[i++] = GLX_DOUBLEBUFFER; | |
104 } | |
105 | |
106 attribs[i++] = GLX_DEPTH_SIZE; | |
107 attribs[i++] = this->gl_config.depth_size; | |
108 | |
109 if( this->gl_config.stencil_size ) { | |
110 attribs[i++] = GLX_STENCIL_SIZE; | |
111 attribs[i++] = this->gl_config.stencil_size; | |
112 } | |
113 | |
114 if( this->gl_config.accum_red_size ) { | |
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115 attribs[i++] = GLX_ACCUM_RED_SIZE; |
0 | 116 attribs[i++] = this->gl_config.accum_red_size; |
117 } | |
118 | |
119 if( this->gl_config.accum_green_size ) { | |
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120 attribs[i++] = GLX_ACCUM_GREEN_SIZE; |
0 | 121 attribs[i++] = this->gl_config.accum_green_size; |
122 } | |
123 | |
124 if( this->gl_config.accum_blue_size ) { | |
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125 attribs[i++] = GLX_ACCUM_BLUE_SIZE; |
0 | 126 attribs[i++] = this->gl_config.accum_blue_size; |
127 } | |
128 | |
129 if( this->gl_config.accum_alpha_size ) { | |
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130 attribs[i++] = GLX_ACCUM_ALPHA_SIZE; |
0 | 131 attribs[i++] = this->gl_config.accum_alpha_size; |
132 } | |
133 | |
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134 if( this->gl_config.stereo ) { |
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135 attribs[i++] = GLX_STEREO; |
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136 attribs[i++] = this->gl_config.stereo; |
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137 } |
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138 |
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139 if( this->gl_config.multisamplebuffers ) { |
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140 attribs[i++] = GLX_SAMPLE_BUFFERS_ARB; |
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141 attribs[i++] = this->gl_config.multisamplebuffers; |
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142 } |
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143 |
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144 if( this->gl_config.multisamplesamples ) { |
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145 attribs[i++] = GLX_SAMPLES_ARB; |
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146 attribs[i++] = this->gl_config.multisamplesamples; |
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147 } |
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148 |
0 | 149 #ifdef GLX_DIRECT_COLOR /* Try for a DirectColor visual for gamma support */ |
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150 if ( !getenv("SDL_VIDEO_X11_NODIRECTCOLOR") ) { |
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151 attribs[i++] = GLX_X_VISUAL_TYPE; |
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152 attribs[i++] = GLX_DIRECT_COLOR; |
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153 } |
0 | 154 #endif |
155 attribs[i++] = None; | |
156 | |
157 glx_visualinfo = this->gl_data->glXChooseVisual(GFX_Display, | |
158 SDL_Screen, attribs); | |
159 #ifdef GLX_DIRECT_COLOR | |
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160 if( !glx_visualinfo && !getenv("SDL_VIDEO_X11_NODIRECTCOLOR") ) { /* No DirectColor visual? Try again.. */ |
0 | 161 attribs[i-3] = None; |
162 glx_visualinfo = this->gl_data->glXChooseVisual(GFX_Display, | |
163 SDL_Screen, attribs); | |
164 } | |
165 #endif | |
166 if( !glx_visualinfo ) { | |
167 SDL_SetError( "Couldn't find matching GLX visual"); | |
168 return NULL; | |
169 } | |
170 return glx_visualinfo; | |
171 #else | |
172 SDL_SetError("X11 driver not configured with OpenGL"); | |
173 return NULL; | |
174 #endif | |
175 } | |
176 | |
177 int X11_GL_CreateWindow(_THIS, int w, int h) | |
178 { | |
179 int retval; | |
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180 #ifdef HAVE_OPENGL_X11 |
0 | 181 XSetWindowAttributes attributes; |
182 unsigned long mask; | |
183 unsigned long black; | |
184 | |
185 black = (glx_visualinfo->visual == DefaultVisual(SDL_Display, | |
186 SDL_Screen)) | |
187 ? BlackPixel(SDL_Display, SDL_Screen) : 0; | |
188 attributes.background_pixel = black; | |
189 attributes.border_pixel = black; | |
190 attributes.colormap = SDL_XColorMap; | |
191 mask = CWBackPixel | CWBorderPixel | CWColormap; | |
192 | |
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193 SDL_Window = pXCreateWindow(SDL_Display, WMwindow, |
0 | 194 0, 0, w, h, 0, glx_visualinfo->depth, |
195 InputOutput, glx_visualinfo->visual, | |
196 mask, &attributes); | |
197 if ( !SDL_Window ) { | |
198 SDL_SetError("Could not create window"); | |
199 return -1; | |
200 } | |
201 retval = 0; | |
202 #else | |
203 SDL_SetError("X11 driver not configured with OpenGL"); | |
204 retval = -1; | |
205 #endif | |
206 return(retval); | |
207 } | |
208 | |
209 int X11_GL_CreateContext(_THIS) | |
210 { | |
211 int retval; | |
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212 #ifdef HAVE_OPENGL_X11 |
0 | 213 /* We do this to create a clean separation between X and GLX errors. */ |
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214 pXSync( SDL_Display, False ); |
0 | 215 glx_context = this->gl_data->glXCreateContext(GFX_Display, |
216 glx_visualinfo, NULL, True); | |
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217 pXSync( GFX_Display, False ); |
0 | 218 |
219 if (glx_context == NULL) { | |
220 SDL_SetError("Could not create GL context"); | |
221 return -1; | |
222 } | |
223 | |
224 gl_active = 1; | |
225 #else | |
226 SDL_SetError("X11 driver not configured with OpenGL"); | |
227 #endif | |
228 if ( gl_active ) { | |
229 retval = 0; | |
230 } else { | |
231 retval = -1; | |
232 } | |
233 return(retval); | |
234 } | |
235 | |
236 void X11_GL_Shutdown(_THIS) | |
237 { | |
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238 #ifdef HAVE_OPENGL_X11 |
0 | 239 /* Clean up OpenGL */ |
240 if( glx_context ) { | |
241 this->gl_data->glXMakeCurrent(GFX_Display, None, NULL); | |
242 | |
243 if (glx_context != NULL) | |
244 this->gl_data->glXDestroyContext(GFX_Display, glx_context); | |
245 | |
246 if( this->gl_data->glXReleaseBuffersMESA ) { | |
247 this->gl_data->glXReleaseBuffersMESA(GFX_Display,SDL_Window); | |
248 } | |
249 glx_context = NULL; | |
250 } | |
251 gl_active = 0; | |
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252 #endif /* HAVE_OPENGL_X11 */ |
0 | 253 } |
254 | |
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255 #ifdef HAVE_OPENGL_X11 |
0 | 256 |
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257 static int ExtensionSupported(const char *extension) |
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258 { |
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259 const GLubyte *extensions = NULL; |
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260 const GLubyte *start; |
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261 GLubyte *where, *terminator; |
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262 |
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263 /* Extension names should not have spaces. */ |
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264 where = (GLubyte *) strchr(extension, ' '); |
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265 if (where || *extension == '\0') |
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266 return 0; |
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267 |
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268 extensions = current_video->glGetString(GL_EXTENSIONS); |
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269 /* It takes a bit of care to be fool-proof about parsing the |
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270 * OpenGL extensions string. Don't be fooled by sub-strings, |
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271 * etc. */ |
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272 |
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273 start = extensions; |
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274 |
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275 for (;;) |
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276 { |
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277 where = (GLubyte *) strstr((const char *) start, extension); |
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278 if (!where) break; |
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279 |
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280 terminator = where + strlen(extension); |
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281 if (where == start || *(where - 1) == ' ') |
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282 if (*terminator == ' ' || *terminator == '\0') return 1; |
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283 |
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284 start = terminator; |
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285 } |
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286 |
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287 return 0; |
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288 } |
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289 |
0 | 290 /* Make the current context active */ |
291 int X11_GL_MakeCurrent(_THIS) | |
292 { | |
293 int retval; | |
638
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294 |
0 | 295 retval = 0; |
296 if ( ! this->gl_data->glXMakeCurrent(GFX_Display, | |
297 SDL_Window, glx_context) ) { | |
298 SDL_SetError("Unable to make GL context current"); | |
299 retval = -1; | |
300 } | |
1168
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301 pXSync( GFX_Display, False ); |
0 | 302 |
638
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303 /* |
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304 * The context is now current, check for glXReleaseBuffersMESA() |
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305 * extension. If extension is _not_ supported, destroy the pointer |
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306 * (to make sure it will not be called in X11_GL_Shutdown() ). |
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307 * |
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308 * DRI/Mesa drivers include glXReleaseBuffersMESA() in the libGL.so, |
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309 * but there's no need to call it (is is only needed for some old |
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310 * non-DRI drivers). |
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311 * |
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312 * When using for example glew (http://glew.sf.net), dlsym() for |
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313 * glXReleaseBuffersMESA() returns the pointer from the glew library |
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314 * (namespace conflict). |
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315 * |
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316 * The glXReleaseBuffersMESA() pointer in the glew is NULL, if the |
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317 * driver doesn't support this extension. So blindly calling it will |
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318 * cause segfault with DRI/Mesa drivers! |
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319 * |
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320 */ |
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321 |
655
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322 if ( ! ExtensionSupported("glXReleaseBuffersMESA") ) { |
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323 this->gl_data->glXReleaseBuffersMESA = NULL; |
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324 } |
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325 |
0 | 326 /* More Voodoo X server workarounds... Grr... */ |
327 SDL_Lock_EventThread(); | |
328 X11_CheckDGAMouse(this); | |
329 SDL_Unlock_EventThread(); | |
330 | |
331 return(retval); | |
332 } | |
333 | |
334 /* Get attribute data from glX. */ | |
335 int X11_GL_GetAttribute(_THIS, SDL_GLattr attrib, int* value) | |
336 { | |
337 int retval; | |
338 int glx_attrib = None; | |
339 | |
340 switch( attrib ) { | |
341 case SDL_GL_RED_SIZE: | |
342 glx_attrib = GLX_RED_SIZE; | |
343 break; | |
344 case SDL_GL_GREEN_SIZE: | |
345 glx_attrib = GLX_GREEN_SIZE; | |
346 break; | |
347 case SDL_GL_BLUE_SIZE: | |
348 glx_attrib = GLX_BLUE_SIZE; | |
349 break; | |
350 case SDL_GL_ALPHA_SIZE: | |
351 glx_attrib = GLX_ALPHA_SIZE; | |
352 break; | |
353 case SDL_GL_DOUBLEBUFFER: | |
354 glx_attrib = GLX_DOUBLEBUFFER; | |
355 break; | |
356 case SDL_GL_BUFFER_SIZE: | |
357 glx_attrib = GLX_BUFFER_SIZE; | |
358 break; | |
359 case SDL_GL_DEPTH_SIZE: | |
360 glx_attrib = GLX_DEPTH_SIZE; | |
361 break; | |
362 case SDL_GL_STENCIL_SIZE: | |
363 glx_attrib = GLX_STENCIL_SIZE; | |
364 break; | |
365 case SDL_GL_ACCUM_RED_SIZE: | |
366 glx_attrib = GLX_ACCUM_RED_SIZE; | |
367 break; | |
368 case SDL_GL_ACCUM_GREEN_SIZE: | |
369 glx_attrib = GLX_ACCUM_GREEN_SIZE; | |
370 break; | |
371 case SDL_GL_ACCUM_BLUE_SIZE: | |
372 glx_attrib = GLX_ACCUM_BLUE_SIZE; | |
373 break; | |
374 case SDL_GL_ACCUM_ALPHA_SIZE: | |
375 glx_attrib = GLX_ACCUM_ALPHA_SIZE; | |
376 break; | |
450
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377 case SDL_GL_STEREO: |
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378 glx_attrib = GLX_STEREO; |
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379 break; |
656
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380 case SDL_GL_MULTISAMPLEBUFFERS: |
655
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381 glx_attrib = GLX_SAMPLE_BUFFERS_ARB; |
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382 break; |
656
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383 case SDL_GL_MULTISAMPLESAMPLES: |
655
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384 glx_attrib = GLX_SAMPLES_ARB; |
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385 break; |
0 | 386 default: |
387 return(-1); | |
388 } | |
389 | |
390 retval = this->gl_data->glXGetConfig(GFX_Display, glx_visualinfo, glx_attrib, value); | |
391 | |
392 return retval; | |
393 } | |
394 | |
395 void X11_GL_SwapBuffers(_THIS) | |
396 { | |
397 this->gl_data->glXSwapBuffers(GFX_Display, SDL_Window); | |
398 } | |
399 | |
1191
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400 #endif /* HAVE_OPENGL_X11 */ |
0 | 401 |
402 void X11_GL_UnloadLibrary(_THIS) | |
403 { | |
1191
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404 #ifdef HAVE_OPENGL_X11 |
0 | 405 if ( this->gl_config.driver_loaded ) { |
1191
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406 |
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407 /* !!! FIXME: Can we just use SDL_UnloadObject() everywhere? */ |
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408 #ifdef USE_DLOPEN |
0 | 409 dlclose(this->gl_config.dll_handle); |
1191
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410 #else |
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411 SDL_UnloadObject(this->gl_config.dll_handle); |
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412 #endif |
0 | 413 |
414 this->gl_data->glXGetProcAddress = NULL; | |
415 this->gl_data->glXChooseVisual = NULL; | |
416 this->gl_data->glXCreateContext = NULL; | |
417 this->gl_data->glXDestroyContext = NULL; | |
418 this->gl_data->glXMakeCurrent = NULL; | |
419 this->gl_data->glXSwapBuffers = NULL; | |
420 | |
421 this->gl_config.dll_handle = NULL; | |
422 this->gl_config.driver_loaded = 0; | |
423 } | |
424 #endif | |
425 } | |
426 | |
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427 #ifdef HAVE_OPENGL_X11 |
0 | 428 |
1191
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429 static void *do_dlsym(void *handle, const char *name) |
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430 { |
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431 /* !!! FIXME: Can we just use SDL_LoadFunction() everywhere? */ |
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432 #ifdef USE_DLOPEN |
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433 return dlsym(handle, name); |
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434 #else |
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435 return SDL_LoadFunction(handle, name); |
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436 #endif |
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437 } |
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438 |
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439 #if defined(__OpenBSD__) && !defined(__ELF__) |
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440 #define do_dlsym(x,y) do_dlsym(x, "_" y) |
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441 #endif |
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442 |
0 | 443 /* Passing a NULL path means load pointers from the application */ |
444 int X11_GL_LoadLibrary(_THIS, const char* path) | |
445 { | |
1191
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446 void* handle = NULL; |
0 | 447 |
1182
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448 if ( gl_active ) { |
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449 SDL_SetError("OpenGL context already created"); |
e8e8dcb68e7a
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450 return -1; |
e8e8dcb68e7a
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451 } |
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452 |
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453 if ( path == NULL ) { |
0 | 454 path = getenv("SDL_VIDEO_GL_DRIVER"); |
455 if ( path == NULL ) { | |
456 path = DEFAULT_OPENGL; | |
457 } | |
1191
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458 } |
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459 |
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460 /* !!! FIXME: Can we just use SDL_LoadObject() everywhere? */ |
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461 #ifdef USE_DLOPEN |
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462 { |
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463 #ifdef RTLD_GLOBAL |
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464 int dlopen_flags = RTLD_LAZY | RTLD_GLOBAL; |
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465 #else |
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466 int dlopen_flags = RTLD_LAZY; |
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467 #endif |
0 | 468 handle = dlopen(path, dlopen_flags); |
469 } | |
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470 #else |
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471 handle = SDL_LoadObject(path); |
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472 #endif |
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473 |
0 | 474 if ( handle == NULL ) { |
475 SDL_SetError("Could not load OpenGL library"); | |
476 return -1; | |
477 } | |
478 | |
479 /* Unload the old driver and reset the pointers */ | |
480 X11_GL_UnloadLibrary(this); | |
481 | |
482 /* Load new function pointers */ | |
180
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483 this->gl_data->glXGetProcAddress = |
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484 (void *(*)(const GLubyte *)) do_dlsym(handle, "glXGetProcAddressARB"); |
180
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485 this->gl_data->glXChooseVisual = |
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486 (XVisualInfo *(*)(Display *, int, int *)) do_dlsym(handle, "glXChooseVisual"); |
180
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487 this->gl_data->glXCreateContext = |
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488 (GLXContext (*)(Display *, XVisualInfo *, GLXContext, int)) do_dlsym(handle, "glXCreateContext"); |
180
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489 this->gl_data->glXDestroyContext = |
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490 (void (*)(Display *, GLXContext)) do_dlsym(handle, "glXDestroyContext"); |
180
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491 this->gl_data->glXMakeCurrent = |
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492 (int (*)(Display *, GLXDrawable, GLXContext)) do_dlsym(handle, "glXMakeCurrent"); |
180
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493 this->gl_data->glXSwapBuffers = |
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494 (void (*)(Display *, GLXDrawable)) do_dlsym(handle, "glXSwapBuffers"); |
180
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495 this->gl_data->glXGetConfig = |
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496 (int (*)(Display *, XVisualInfo *, int, int *)) do_dlsym(handle, "glXGetConfig"); |
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497 this->gl_data->glXQueryExtensionsString = |
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498 (const char *(*)(Display *, int)) do_dlsym(handle, "glXQueryExtensionsString"); |
638
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499 |
0 | 500 /* We don't compare below for this in case we're not using Mesa. */ |
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501 this->gl_data->glXReleaseBuffersMESA = |
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502 (void (*)(Display *, GLXDrawable)) do_dlsym( handle, "glXReleaseBuffersMESA" ); |
638
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503 |
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504 |
0 | 505 if ( (this->gl_data->glXChooseVisual == NULL) || |
506 (this->gl_data->glXCreateContext == NULL) || | |
507 (this->gl_data->glXDestroyContext == NULL) || | |
508 (this->gl_data->glXMakeCurrent == NULL) || | |
509 (this->gl_data->glXSwapBuffers == NULL) || | |
638
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510 (this->gl_data->glXGetConfig == NULL) || |
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511 (this->gl_data->glXQueryExtensionsString == NULL)) { |
0 | 512 SDL_SetError("Could not retrieve OpenGL functions"); |
513 return -1; | |
514 } | |
515 | |
516 this->gl_config.dll_handle = handle; | |
517 this->gl_config.driver_loaded = 1; | |
518 if ( path ) { | |
519 strncpy(this->gl_config.driver_path, path, | |
520 sizeof(this->gl_config.driver_path)-1); | |
521 } else { | |
522 strcpy(this->gl_config.driver_path, ""); | |
523 } | |
524 return 0; | |
525 } | |
526 | |
527 void *X11_GL_GetProcAddress(_THIS, const char* proc) | |
528 { | |
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529 static char procname[1024]; |
0 | 530 void* handle; |
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531 void* retval; |
0 | 532 |
533 handle = this->gl_config.dll_handle; | |
534 if ( this->gl_data->glXGetProcAddress ) { | |
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535 return this->gl_data->glXGetProcAddress(proc); |
0 | 536 } |
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537 #if defined(__OpenBSD__) && !defined(__ELF__) |
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538 #undef do_dlsym |
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539 #endif |
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540 retval = do_dlsym(handle, proc); |
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541 if (!retval && strlen(proc) <= 1022) { |
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542 procname[0] = '_'; |
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543 strcpy(procname + 1, proc); |
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544 retval = do_dlsym(handle, procname); |
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545 } |
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546 return retval; |
0 | 547 } |
548 | |
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549 #endif /* HAVE_OPENGL_X11 */ |