Mercurial > sdl-ios-xcode
annotate src/video/x11/SDL_x11gl.c @ 655:9c42ee1b7d77
Date: Thu, 24 Apr 2003 15:13:47 -0400
From: Shawn Kirst
Subject: SDL-1.2.5 patch to add ARB_multisample support
Attached is a patch I have written for SDL-1.2.5 that adds ARB_multisample
support. I only have the X11 and Win32 video patched. The Win32 patch also
adds support for WGL_ARB_pixel_format, as it was required for getting a
multisample capable pixel format. No additional GL header files are required
to compile on either platform (though you need an up-to-date glx.h for X11).
Requesting a multisample pixel format is made possible using
SDL_GL_SetAttribute with the two new SDL_GLattr's I've added
(SDL_GL_SAMPLE_BUFFERS and SDL_GL_SAMPLES). I've been using SDL in my
projects for quite a while now, so I am happy to contribute back to the
project. Now you can have and control FSAA in your SDL/GL apps at the
application level!
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Tue, 22 Jul 2003 15:10:06 +0000 |
| parents | 0f2029a70548 |
| children | 864e2d2a9a55 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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Updated copyright information for 2002
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 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 | |
| 37 #define DEFAULT_OPENGL "libGL.so.1" | |
| 38 | |
| 39 /* return the preferred visual to use for openGL graphics */ | |
| 40 XVisualInfo *X11_GL_GetVisual(_THIS) | |
| 41 { | |
| 42 #ifdef HAVE_OPENGL | |
| 43 /* 64 seems nice. */ | |
| 44 int attribs[64]; | |
| 45 int i; | |
| 46 | |
| 47 /* load the gl driver from a default path */ | |
| 48 if ( ! this->gl_config.driver_loaded ) { | |
| 49 /* no driver has been loaded, use default (ourselves) */ | |
| 50 if ( X11_GL_LoadLibrary(this, NULL) < 0 ) { | |
| 51 return NULL; | |
| 52 } | |
| 53 } | |
| 54 | |
| 55 /* See if we already have a window which we must use */ | |
| 56 if ( SDL_windowid ) { | |
| 57 XWindowAttributes a; | |
| 58 XVisualInfo vi_in; | |
| 59 int out_count; | |
| 60 | |
| 61 XGetWindowAttributes(SDL_Display, SDL_Window, &a); | |
| 62 vi_in.screen = SDL_Screen; | |
| 63 vi_in.visualid = XVisualIDFromVisual(a.visual); | |
| 64 glx_visualinfo = XGetVisualInfo(SDL_Display, | |
| 65 VisualScreenMask|VisualIDMask, &vi_in, &out_count); | |
| 66 return glx_visualinfo; | |
| 67 } | |
| 68 | |
| 69 /* Setup our GLX attributes according to the gl_config. */ | |
|
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70 i = 0; |
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71 attribs[i++] = GLX_RGBA; |
| 0 | 72 attribs[i++] = GLX_RED_SIZE; |
| 73 attribs[i++] = this->gl_config.red_size; | |
| 74 attribs[i++] = GLX_GREEN_SIZE; | |
| 75 attribs[i++] = this->gl_config.green_size; | |
| 76 attribs[i++] = GLX_BLUE_SIZE; | |
| 77 attribs[i++] = this->gl_config.blue_size; | |
| 78 | |
| 79 if( this->gl_config.alpha_size ) { | |
| 80 attribs[i++] = GLX_ALPHA_SIZE; | |
| 81 attribs[i++] = this->gl_config.alpha_size; | |
| 82 } | |
| 83 | |
| 84 if( this->gl_config.buffer_size ) { | |
|
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85 attribs[i++] = GLX_BUFFER_SIZE; |
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86 attribs[i++] = this->gl_config.buffer_size; |
| 0 | 87 } |
| 88 | |
| 89 if( this->gl_config.double_buffer ) { | |
| 90 attribs[i++] = GLX_DOUBLEBUFFER; | |
| 91 } | |
| 92 | |
| 93 attribs[i++] = GLX_DEPTH_SIZE; | |
| 94 attribs[i++] = this->gl_config.depth_size; | |
| 95 | |
| 96 if( this->gl_config.stencil_size ) { | |
| 97 attribs[i++] = GLX_STENCIL_SIZE; | |
| 98 attribs[i++] = this->gl_config.stencil_size; | |
| 99 } | |
| 100 | |
| 101 if( this->gl_config.accum_red_size ) { | |
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102 attribs[i++] = GLX_ACCUM_RED_SIZE; |
| 0 | 103 attribs[i++] = this->gl_config.accum_red_size; |
| 104 } | |
| 105 | |
| 106 if( this->gl_config.accum_green_size ) { | |
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107 attribs[i++] = GLX_ACCUM_GREEN_SIZE; |
| 0 | 108 attribs[i++] = this->gl_config.accum_green_size; |
| 109 } | |
| 110 | |
| 111 if( this->gl_config.accum_blue_size ) { | |
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112 attribs[i++] = GLX_ACCUM_BLUE_SIZE; |
| 0 | 113 attribs[i++] = this->gl_config.accum_blue_size; |
| 114 } | |
| 115 | |
| 116 if( this->gl_config.accum_alpha_size ) { | |
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117 attribs[i++] = GLX_ACCUM_ALPHA_SIZE; |
| 0 | 118 attribs[i++] = this->gl_config.accum_alpha_size; |
| 119 } | |
| 120 | |
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121 if( this->gl_config.stereo ) { |
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122 attribs[i++] = GLX_STEREO; |
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123 attribs[i++] = this->gl_config.stereo; |
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124 } |
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125 |
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126 if( this->gl_config.sample_buffers ) { |
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127 attribs[i++] = GLX_SAMPLE_BUFFERS_ARB; |
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128 attribs[i++] = this->gl_config.sample_buffers; |
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129 } |
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130 |
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131 if( this->gl_config.samples ) { |
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132 attribs[i++] = GLX_SAMPLES_ARB; |
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133 attribs[i++] = this->gl_config.samples; |
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134 } |
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135 |
| 0 | 136 #ifdef GLX_DIRECT_COLOR /* Try for a DirectColor visual for gamma support */ |
| 137 attribs[i++] = GLX_X_VISUAL_TYPE; | |
| 138 attribs[i++] = GLX_DIRECT_COLOR; | |
| 139 #endif | |
| 140 attribs[i++] = None; | |
| 141 | |
| 142 glx_visualinfo = this->gl_data->glXChooseVisual(GFX_Display, | |
| 143 SDL_Screen, attribs); | |
| 144 #ifdef GLX_DIRECT_COLOR | |
| 145 if( !glx_visualinfo ) { /* No DirectColor visual? Try again.. */ | |
| 146 attribs[i-3] = None; | |
| 147 glx_visualinfo = this->gl_data->glXChooseVisual(GFX_Display, | |
| 148 SDL_Screen, attribs); | |
| 149 } | |
| 150 #endif | |
| 151 if( !glx_visualinfo ) { | |
| 152 SDL_SetError( "Couldn't find matching GLX visual"); | |
| 153 return NULL; | |
| 154 } | |
| 155 return glx_visualinfo; | |
| 156 #else | |
| 157 SDL_SetError("X11 driver not configured with OpenGL"); | |
| 158 return NULL; | |
| 159 #endif | |
| 160 } | |
| 161 | |
| 162 int X11_GL_CreateWindow(_THIS, int w, int h) | |
| 163 { | |
| 164 int retval; | |
| 165 #ifdef HAVE_OPENGL | |
| 166 XSetWindowAttributes attributes; | |
| 167 unsigned long mask; | |
| 168 unsigned long black; | |
| 169 | |
| 170 black = (glx_visualinfo->visual == DefaultVisual(SDL_Display, | |
| 171 SDL_Screen)) | |
| 172 ? BlackPixel(SDL_Display, SDL_Screen) : 0; | |
| 173 attributes.background_pixel = black; | |
| 174 attributes.border_pixel = black; | |
| 175 attributes.colormap = SDL_XColorMap; | |
| 176 mask = CWBackPixel | CWBorderPixel | CWColormap; | |
| 177 | |
| 178 SDL_Window = XCreateWindow(SDL_Display, WMwindow, | |
| 179 0, 0, w, h, 0, glx_visualinfo->depth, | |
| 180 InputOutput, glx_visualinfo->visual, | |
| 181 mask, &attributes); | |
| 182 if ( !SDL_Window ) { | |
| 183 SDL_SetError("Could not create window"); | |
| 184 return -1; | |
| 185 } | |
| 186 retval = 0; | |
| 187 #else | |
| 188 SDL_SetError("X11 driver not configured with OpenGL"); | |
| 189 retval = -1; | |
| 190 #endif | |
| 191 return(retval); | |
| 192 } | |
| 193 | |
| 194 int X11_GL_CreateContext(_THIS) | |
| 195 { | |
| 196 int retval; | |
| 197 #ifdef HAVE_OPENGL | |
| 198 /* We do this to create a clean separation between X and GLX errors. */ | |
| 199 XSync( SDL_Display, False ); | |
| 200 glx_context = this->gl_data->glXCreateContext(GFX_Display, | |
| 201 glx_visualinfo, NULL, True); | |
| 202 XSync( GFX_Display, False ); | |
| 203 | |
| 204 if (glx_context == NULL) { | |
| 205 SDL_SetError("Could not create GL context"); | |
| 206 return -1; | |
| 207 } | |
| 208 | |
| 209 gl_active = 1; | |
| 210 #else | |
| 211 SDL_SetError("X11 driver not configured with OpenGL"); | |
| 212 #endif | |
| 213 if ( gl_active ) { | |
| 214 retval = 0; | |
| 215 } else { | |
| 216 retval = -1; | |
| 217 } | |
| 218 return(retval); | |
| 219 } | |
| 220 | |
| 221 void X11_GL_Shutdown(_THIS) | |
| 222 { | |
| 223 #ifdef HAVE_OPENGL | |
| 224 /* Clean up OpenGL */ | |
| 225 if( glx_context ) { | |
| 226 this->gl_data->glXMakeCurrent(GFX_Display, None, NULL); | |
| 227 | |
| 228 if (glx_context != NULL) | |
| 229 this->gl_data->glXDestroyContext(GFX_Display, glx_context); | |
| 230 | |
| 231 if( this->gl_data->glXReleaseBuffersMESA ) { | |
| 232 this->gl_data->glXReleaseBuffersMESA(GFX_Display,SDL_Window); | |
| 233 } | |
| 234 glx_context = NULL; | |
| 235 } | |
| 236 gl_active = 0; | |
| 237 #endif /* HAVE_OPENGL */ | |
| 238 } | |
| 239 | |
| 240 #ifdef HAVE_OPENGL | |
| 241 | |
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242 static int ExtensionSupported(const char *extension) |
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243 { |
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244 const GLubyte *extensions = NULL; |
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245 const GLubyte *start; |
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246 GLubyte *where, *terminator; |
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247 |
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248 /* Extension names should not have spaces. */ |
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249 where = (GLubyte *) strchr(extension, ' '); |
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250 if (where || *extension == '\0') |
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251 return 0; |
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252 |
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253 extensions = current_video->glGetString(GL_EXTENSIONS); |
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254 /* It takes a bit of care to be fool-proof about parsing the |
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255 * OpenGL extensions string. Don't be fooled by sub-strings, |
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256 * etc. */ |
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257 |
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258 start = extensions; |
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259 |
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260 for (;;) |
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261 { |
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262 where = (GLubyte *) strstr((const char *) start, extension); |
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263 if (!where) break; |
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264 |
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265 terminator = where + strlen(extension); |
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266 if (where == start || *(where - 1) == ' ') |
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267 if (*terminator == ' ' || *terminator == '\0') return 1; |
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268 |
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269 start = terminator; |
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270 } |
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271 |
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272 return 0; |
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273 } |
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274 |
| 0 | 275 /* Make the current context active */ |
| 276 int X11_GL_MakeCurrent(_THIS) | |
| 277 { | |
| 278 int retval; | |
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279 |
| 0 | 280 retval = 0; |
| 281 if ( ! this->gl_data->glXMakeCurrent(GFX_Display, | |
| 282 SDL_Window, glx_context) ) { | |
| 283 SDL_SetError("Unable to make GL context current"); | |
| 284 retval = -1; | |
| 285 } | |
| 286 XSync( GFX_Display, False ); | |
| 287 | |
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288 /* |
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289 * The context is now current, check for glXReleaseBuffersMESA() |
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290 * extension. If extension is _not_ supported, destroy the pointer |
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291 * (to make sure it will not be called in X11_GL_Shutdown() ). |
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292 * |
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293 * DRI/Mesa drivers include glXReleaseBuffersMESA() in the libGL.so, |
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294 * but there's no need to call it (is is only needed for some old |
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295 * non-DRI drivers). |
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296 * |
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297 * When using for example glew (http://glew.sf.net), dlsym() for |
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298 * glXReleaseBuffersMESA() returns the pointer from the glew library |
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299 * (namespace conflict). |
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300 * |
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301 * The glXReleaseBuffersMESA() pointer in the glew is NULL, if the |
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302 * driver doesn't support this extension. So blindly calling it will |
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303 * cause segfault with DRI/Mesa drivers! |
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304 * |
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305 */ |
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306 |
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307 if ( ! ExtensionSupported("glXReleaseBuffersMESA") ) { |
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308 this->gl_data->glXReleaseBuffersMESA = NULL; |
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309 } |
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310 |
| 0 | 311 /* More Voodoo X server workarounds... Grr... */ |
| 312 SDL_Lock_EventThread(); | |
| 313 X11_CheckDGAMouse(this); | |
| 314 SDL_Unlock_EventThread(); | |
| 315 | |
| 316 return(retval); | |
| 317 } | |
| 318 | |
| 319 /* Get attribute data from glX. */ | |
| 320 int X11_GL_GetAttribute(_THIS, SDL_GLattr attrib, int* value) | |
| 321 { | |
| 322 int retval; | |
| 323 int glx_attrib = None; | |
| 324 | |
| 325 switch( attrib ) { | |
| 326 case SDL_GL_RED_SIZE: | |
| 327 glx_attrib = GLX_RED_SIZE; | |
| 328 break; | |
| 329 case SDL_GL_GREEN_SIZE: | |
| 330 glx_attrib = GLX_GREEN_SIZE; | |
| 331 break; | |
| 332 case SDL_GL_BLUE_SIZE: | |
| 333 glx_attrib = GLX_BLUE_SIZE; | |
| 334 break; | |
| 335 case SDL_GL_ALPHA_SIZE: | |
| 336 glx_attrib = GLX_ALPHA_SIZE; | |
| 337 break; | |
| 338 case SDL_GL_DOUBLEBUFFER: | |
| 339 glx_attrib = GLX_DOUBLEBUFFER; | |
| 340 break; | |
| 341 case SDL_GL_BUFFER_SIZE: | |
| 342 glx_attrib = GLX_BUFFER_SIZE; | |
| 343 break; | |
| 344 case SDL_GL_DEPTH_SIZE: | |
| 345 glx_attrib = GLX_DEPTH_SIZE; | |
| 346 break; | |
| 347 case SDL_GL_STENCIL_SIZE: | |
| 348 glx_attrib = GLX_STENCIL_SIZE; | |
| 349 break; | |
| 350 case SDL_GL_ACCUM_RED_SIZE: | |
| 351 glx_attrib = GLX_ACCUM_RED_SIZE; | |
| 352 break; | |
| 353 case SDL_GL_ACCUM_GREEN_SIZE: | |
| 354 glx_attrib = GLX_ACCUM_GREEN_SIZE; | |
| 355 break; | |
| 356 case SDL_GL_ACCUM_BLUE_SIZE: | |
| 357 glx_attrib = GLX_ACCUM_BLUE_SIZE; | |
| 358 break; | |
| 359 case SDL_GL_ACCUM_ALPHA_SIZE: | |
| 360 glx_attrib = GLX_ACCUM_ALPHA_SIZE; | |
| 361 break; | |
|
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362 case SDL_GL_STEREO: |
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363 glx_attrib = GLX_STEREO; |
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364 break; |
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365 case SDL_GL_SAMPLE_BUFFERS: |
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366 glx_attrib = GLX_SAMPLE_BUFFERS_ARB; |
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367 break; |
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368 case SDL_GL_SAMPLES: |
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369 glx_attrib = GLX_SAMPLES_ARB; |
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370 break; |
| 0 | 371 default: |
| 372 return(-1); | |
| 373 } | |
| 374 | |
| 375 retval = this->gl_data->glXGetConfig(GFX_Display, glx_visualinfo, glx_attrib, value); | |
| 376 | |
| 377 return retval; | |
| 378 } | |
| 379 | |
| 380 void X11_GL_SwapBuffers(_THIS) | |
| 381 { | |
| 382 this->gl_data->glXSwapBuffers(GFX_Display, SDL_Window); | |
| 383 } | |
| 384 | |
| 385 #endif /* HAVE_OPENGL */ | |
| 386 | |
| 387 void X11_GL_UnloadLibrary(_THIS) | |
| 388 { | |
| 389 #ifdef HAVE_OPENGL | |
| 390 if ( this->gl_config.driver_loaded ) { | |
| 391 dlclose(this->gl_config.dll_handle); | |
| 392 | |
| 393 this->gl_data->glXGetProcAddress = NULL; | |
| 394 this->gl_data->glXChooseVisual = NULL; | |
| 395 this->gl_data->glXCreateContext = NULL; | |
| 396 this->gl_data->glXDestroyContext = NULL; | |
| 397 this->gl_data->glXMakeCurrent = NULL; | |
| 398 this->gl_data->glXSwapBuffers = NULL; | |
| 399 | |
| 400 this->gl_config.dll_handle = NULL; | |
| 401 this->gl_config.driver_loaded = 0; | |
| 402 } | |
| 403 #endif | |
| 404 } | |
| 405 | |
| 406 #ifdef HAVE_OPENGL | |
| 407 | |
| 408 /* Passing a NULL path means load pointers from the application */ | |
| 409 int X11_GL_LoadLibrary(_THIS, const char* path) | |
| 410 { | |
| 411 void* handle; | |
| 412 int dlopen_flags; | |
| 413 | |
| 414 if ( gl_active ) { | |
| 415 SDL_SetError("OpenGL context already created"); | |
| 416 return -1; | |
| 417 } | |
| 418 | |
| 419 #ifdef RTLD_GLOBAL | |
| 420 dlopen_flags = RTLD_LAZY | RTLD_GLOBAL; | |
| 421 #else | |
| 422 dlopen_flags = RTLD_LAZY; | |
| 423 #endif | |
| 424 handle = dlopen(path, dlopen_flags); | |
| 425 /* Catch the case where the application isn't linked with GL */ | |
| 426 if ( (dlsym(handle, "glXChooseVisual") == NULL) && (path == NULL) ) { | |
| 427 dlclose(handle); | |
| 428 path = getenv("SDL_VIDEO_GL_DRIVER"); | |
| 429 if ( path == NULL ) { | |
| 430 path = DEFAULT_OPENGL; | |
| 431 } | |
| 432 handle = dlopen(path, dlopen_flags); | |
| 433 } | |
| 434 if ( handle == NULL ) { | |
| 435 SDL_SetError("Could not load OpenGL library"); | |
| 436 return -1; | |
| 437 } | |
| 438 | |
| 439 /* Unload the old driver and reset the pointers */ | |
| 440 X11_GL_UnloadLibrary(this); | |
| 441 | |
| 442 /* Load new function pointers */ | |
|
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443 this->gl_data->glXGetProcAddress = |
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444 (void *(*)(const GLubyte *)) dlsym(handle, "glXGetProcAddressARB"); |
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445 this->gl_data->glXChooseVisual = |
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446 (XVisualInfo *(*)(Display *, int, int *)) dlsym(handle, "glXChooseVisual"); |
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447 this->gl_data->glXCreateContext = |
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448 (GLXContext (*)(Display *, XVisualInfo *, GLXContext, int)) dlsym(handle, "glXCreateContext"); |
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449 this->gl_data->glXDestroyContext = |
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450 (void (*)(Display *, GLXContext)) dlsym(handle, "glXDestroyContext"); |
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451 this->gl_data->glXMakeCurrent = |
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452 (int (*)(Display *, GLXDrawable, GLXContext)) dlsym(handle, "glXMakeCurrent"); |
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453 this->gl_data->glXSwapBuffers = |
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454 (void (*)(Display *, GLXDrawable)) dlsym(handle, "glXSwapBuffers"); |
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455 this->gl_data->glXGetConfig = |
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456 (int (*)(Display *, XVisualInfo *, int, int *)) dlsym(handle, "glXGetConfig"); |
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457 this->gl_data->glXQueryExtensionsString = |
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458 (const char *(*)(Display *, int)) dlsym(handle, "glXQueryExtensionsString"); |
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638
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459 |
| 0 | 460 /* We don't compare below for this in case we're not using Mesa. */ |
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461 this->gl_data->glXReleaseBuffersMESA = |
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462 (void (*)(Display *, GLXDrawable)) dlsym( handle, "glXReleaseBuffersMESA" ); |
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463 |
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464 |
| 0 | 465 if ( (this->gl_data->glXChooseVisual == NULL) || |
| 466 (this->gl_data->glXCreateContext == NULL) || | |
| 467 (this->gl_data->glXDestroyContext == NULL) || | |
| 468 (this->gl_data->glXMakeCurrent == NULL) || | |
| 469 (this->gl_data->glXSwapBuffers == NULL) || | |
|
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470 (this->gl_data->glXGetConfig == NULL) || |
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471 (this->gl_data->glXQueryExtensionsString == NULL)) { |
| 0 | 472 SDL_SetError("Could not retrieve OpenGL functions"); |
| 473 return -1; | |
| 474 } | |
| 475 | |
| 476 this->gl_config.dll_handle = handle; | |
| 477 this->gl_config.driver_loaded = 1; | |
| 478 if ( path ) { | |
| 479 strncpy(this->gl_config.driver_path, path, | |
| 480 sizeof(this->gl_config.driver_path)-1); | |
| 481 } else { | |
| 482 strcpy(this->gl_config.driver_path, ""); | |
| 483 } | |
| 484 return 0; | |
| 485 } | |
| 486 | |
| 487 void *X11_GL_GetProcAddress(_THIS, const char* proc) | |
| 488 { | |
|
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489 static char procname[1024]; |
| 0 | 490 void* handle; |
|
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491 void* retval; |
| 0 | 492 |
| 493 handle = this->gl_config.dll_handle; | |
| 494 if ( this->gl_data->glXGetProcAddress ) { | |
|
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495 return this->gl_data->glXGetProcAddress(proc); |
| 0 | 496 } |
|
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497 #if defined(__OpenBSD__) && !defined(__ELF__) |
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498 #undef dlsym(x,y); |
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499 #endif |
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500 retval = dlsym(handle, proc); |
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501 if (!retval && strlen(proc) <= 1022) { |
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502 procname[0] = '_'; |
|
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503 strcpy(procname + 1, proc); |
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504 retval = dlsym(handle, procname); |
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505 } |
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506 return retval; |
| 0 | 507 } |
| 508 | |
| 509 #endif /* HAVE_OPENGL */ |