Mercurial > sdl-ios-xcode
annotate src/video/x11/SDL_x11gl.c @ 688:c0522010bb6d
Date: Tue, 12 Aug 2003 14:26:19 +0200 (MEST)
From: "Mattias Engdeg?rd"
Subject: bug in SDL_GetRGB/GetRGBA
There's an embarrassing bug in GetRGB/GetRGBA which apparently has been there
for years. It incorrectly converts colours with < 8 bits/channel.
It came to my attention today in #sdl.
What it does now is (for each channel):
rv = (pixel & fmt->Rmask) >> fmt->Rshift;
*r = (rv << fmt->Rloss) + (rv >> (8 - fmt->Rloss));
which is wrong; the last line should be
*r = (rv << fmt->Rloss) + (rv >> (8 - (fmt->Rloss << 1)));
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Tue, 12 Aug 2003 15:17:20 +0000 |
| parents | adbed8d7a991 |
| children | b8d311d90021 |
| 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 | |
|
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39 #ifndef GLX_ARB_multisample |
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40 #define GLX_ARB_multisample |
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41 #define GLX_SAMPLE_BUFFERS_ARB 100000 |
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42 #define GLX_SAMPLES_ARB 100001 |
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43 #endif |
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44 |
| 0 | 45 /* return the preferred visual to use for openGL graphics */ |
| 46 XVisualInfo *X11_GL_GetVisual(_THIS) | |
| 47 { | |
| 48 #ifdef HAVE_OPENGL | |
| 49 /* 64 seems nice. */ | |
| 50 int attribs[64]; | |
| 51 int i; | |
| 52 | |
| 53 /* load the gl driver from a default path */ | |
| 54 if ( ! this->gl_config.driver_loaded ) { | |
| 55 /* no driver has been loaded, use default (ourselves) */ | |
| 56 if ( X11_GL_LoadLibrary(this, NULL) < 0 ) { | |
| 57 return NULL; | |
| 58 } | |
| 59 } | |
| 60 | |
| 61 /* See if we already have a window which we must use */ | |
| 62 if ( SDL_windowid ) { | |
| 63 XWindowAttributes a; | |
| 64 XVisualInfo vi_in; | |
| 65 int out_count; | |
| 66 | |
| 67 XGetWindowAttributes(SDL_Display, SDL_Window, &a); | |
| 68 vi_in.screen = SDL_Screen; | |
| 69 vi_in.visualid = XVisualIDFromVisual(a.visual); | |
| 70 glx_visualinfo = XGetVisualInfo(SDL_Display, | |
| 71 VisualScreenMask|VisualIDMask, &vi_in, &out_count); | |
| 72 return glx_visualinfo; | |
| 73 } | |
| 74 | |
| 75 /* Setup our GLX attributes according to the gl_config. */ | |
|
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76 i = 0; |
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77 attribs[i++] = GLX_RGBA; |
| 0 | 78 attribs[i++] = GLX_RED_SIZE; |
| 79 attribs[i++] = this->gl_config.red_size; | |
| 80 attribs[i++] = GLX_GREEN_SIZE; | |
| 81 attribs[i++] = this->gl_config.green_size; | |
| 82 attribs[i++] = GLX_BLUE_SIZE; | |
| 83 attribs[i++] = this->gl_config.blue_size; | |
| 84 | |
| 85 if( this->gl_config.alpha_size ) { | |
| 86 attribs[i++] = GLX_ALPHA_SIZE; | |
| 87 attribs[i++] = this->gl_config.alpha_size; | |
| 88 } | |
| 89 | |
| 90 if( this->gl_config.buffer_size ) { | |
|
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91 attribs[i++] = GLX_BUFFER_SIZE; |
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92 attribs[i++] = this->gl_config.buffer_size; |
| 0 | 93 } |
| 94 | |
| 95 if( this->gl_config.double_buffer ) { | |
| 96 attribs[i++] = GLX_DOUBLEBUFFER; | |
| 97 } | |
| 98 | |
| 99 attribs[i++] = GLX_DEPTH_SIZE; | |
| 100 attribs[i++] = this->gl_config.depth_size; | |
| 101 | |
| 102 if( this->gl_config.stencil_size ) { | |
| 103 attribs[i++] = GLX_STENCIL_SIZE; | |
| 104 attribs[i++] = this->gl_config.stencil_size; | |
| 105 } | |
| 106 | |
| 107 if( this->gl_config.accum_red_size ) { | |
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108 attribs[i++] = GLX_ACCUM_RED_SIZE; |
| 0 | 109 attribs[i++] = this->gl_config.accum_red_size; |
| 110 } | |
| 111 | |
| 112 if( this->gl_config.accum_green_size ) { | |
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113 attribs[i++] = GLX_ACCUM_GREEN_SIZE; |
| 0 | 114 attribs[i++] = this->gl_config.accum_green_size; |
| 115 } | |
| 116 | |
| 117 if( this->gl_config.accum_blue_size ) { | |
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118 attribs[i++] = GLX_ACCUM_BLUE_SIZE; |
| 0 | 119 attribs[i++] = this->gl_config.accum_blue_size; |
| 120 } | |
| 121 | |
| 122 if( this->gl_config.accum_alpha_size ) { | |
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123 attribs[i++] = GLX_ACCUM_ALPHA_SIZE; |
| 0 | 124 attribs[i++] = this->gl_config.accum_alpha_size; |
| 125 } | |
| 126 | |
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127 if( this->gl_config.stereo ) { |
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128 attribs[i++] = GLX_STEREO; |
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129 attribs[i++] = this->gl_config.stereo; |
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130 } |
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131 |
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132 if( this->gl_config.multisamplebuffers ) { |
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133 attribs[i++] = GLX_SAMPLE_BUFFERS_ARB; |
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134 attribs[i++] = this->gl_config.multisamplebuffers; |
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135 } |
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136 |
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137 if( this->gl_config.multisamplesamples ) { |
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138 attribs[i++] = GLX_SAMPLES_ARB; |
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139 attribs[i++] = this->gl_config.multisamplesamples; |
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140 } |
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141 |
| 0 | 142 #ifdef GLX_DIRECT_COLOR /* Try for a DirectColor visual for gamma support */ |
| 143 attribs[i++] = GLX_X_VISUAL_TYPE; | |
| 144 attribs[i++] = GLX_DIRECT_COLOR; | |
| 145 #endif | |
| 146 attribs[i++] = None; | |
| 147 | |
| 148 glx_visualinfo = this->gl_data->glXChooseVisual(GFX_Display, | |
| 149 SDL_Screen, attribs); | |
| 150 #ifdef GLX_DIRECT_COLOR | |
| 151 if( !glx_visualinfo ) { /* No DirectColor visual? Try again.. */ | |
| 152 attribs[i-3] = None; | |
| 153 glx_visualinfo = this->gl_data->glXChooseVisual(GFX_Display, | |
| 154 SDL_Screen, attribs); | |
| 155 } | |
| 156 #endif | |
| 157 if( !glx_visualinfo ) { | |
| 158 SDL_SetError( "Couldn't find matching GLX visual"); | |
| 159 return NULL; | |
| 160 } | |
| 161 return glx_visualinfo; | |
| 162 #else | |
| 163 SDL_SetError("X11 driver not configured with OpenGL"); | |
| 164 return NULL; | |
| 165 #endif | |
| 166 } | |
| 167 | |
| 168 int X11_GL_CreateWindow(_THIS, int w, int h) | |
| 169 { | |
| 170 int retval; | |
| 171 #ifdef HAVE_OPENGL | |
| 172 XSetWindowAttributes attributes; | |
| 173 unsigned long mask; | |
| 174 unsigned long black; | |
| 175 | |
| 176 black = (glx_visualinfo->visual == DefaultVisual(SDL_Display, | |
| 177 SDL_Screen)) | |
| 178 ? BlackPixel(SDL_Display, SDL_Screen) : 0; | |
| 179 attributes.background_pixel = black; | |
| 180 attributes.border_pixel = black; | |
| 181 attributes.colormap = SDL_XColorMap; | |
| 182 mask = CWBackPixel | CWBorderPixel | CWColormap; | |
| 183 | |
| 184 SDL_Window = XCreateWindow(SDL_Display, WMwindow, | |
| 185 0, 0, w, h, 0, glx_visualinfo->depth, | |
| 186 InputOutput, glx_visualinfo->visual, | |
| 187 mask, &attributes); | |
| 188 if ( !SDL_Window ) { | |
| 189 SDL_SetError("Could not create window"); | |
| 190 return -1; | |
| 191 } | |
| 192 retval = 0; | |
| 193 #else | |
| 194 SDL_SetError("X11 driver not configured with OpenGL"); | |
| 195 retval = -1; | |
| 196 #endif | |
| 197 return(retval); | |
| 198 } | |
| 199 | |
| 200 int X11_GL_CreateContext(_THIS) | |
| 201 { | |
| 202 int retval; | |
| 203 #ifdef HAVE_OPENGL | |
| 204 /* We do this to create a clean separation between X and GLX errors. */ | |
| 205 XSync( SDL_Display, False ); | |
| 206 glx_context = this->gl_data->glXCreateContext(GFX_Display, | |
| 207 glx_visualinfo, NULL, True); | |
| 208 XSync( GFX_Display, False ); | |
| 209 | |
| 210 if (glx_context == NULL) { | |
| 211 SDL_SetError("Could not create GL context"); | |
| 212 return -1; | |
| 213 } | |
| 214 | |
| 215 gl_active = 1; | |
| 216 #else | |
| 217 SDL_SetError("X11 driver not configured with OpenGL"); | |
| 218 #endif | |
| 219 if ( gl_active ) { | |
| 220 retval = 0; | |
| 221 } else { | |
| 222 retval = -1; | |
| 223 } | |
| 224 return(retval); | |
| 225 } | |
| 226 | |
| 227 void X11_GL_Shutdown(_THIS) | |
| 228 { | |
| 229 #ifdef HAVE_OPENGL | |
| 230 /* Clean up OpenGL */ | |
| 231 if( glx_context ) { | |
| 232 this->gl_data->glXMakeCurrent(GFX_Display, None, NULL); | |
| 233 | |
| 234 if (glx_context != NULL) | |
| 235 this->gl_data->glXDestroyContext(GFX_Display, glx_context); | |
| 236 | |
| 237 if( this->gl_data->glXReleaseBuffersMESA ) { | |
| 238 this->gl_data->glXReleaseBuffersMESA(GFX_Display,SDL_Window); | |
| 239 } | |
| 240 glx_context = NULL; | |
| 241 } | |
| 242 gl_active = 0; | |
| 243 #endif /* HAVE_OPENGL */ | |
| 244 } | |
| 245 | |
| 246 #ifdef HAVE_OPENGL | |
| 247 | |
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248 static int ExtensionSupported(const char *extension) |
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249 { |
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250 const GLubyte *extensions = NULL; |
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251 const GLubyte *start; |
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252 GLubyte *where, *terminator; |
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253 |
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254 /* Extension names should not have spaces. */ |
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255 where = (GLubyte *) strchr(extension, ' '); |
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256 if (where || *extension == '\0') |
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257 return 0; |
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258 |
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259 extensions = current_video->glGetString(GL_EXTENSIONS); |
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260 /* It takes a bit of care to be fool-proof about parsing the |
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261 * OpenGL extensions string. Don't be fooled by sub-strings, |
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262 * etc. */ |
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263 |
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264 start = extensions; |
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265 |
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266 for (;;) |
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267 { |
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268 where = (GLubyte *) strstr((const char *) start, extension); |
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269 if (!where) break; |
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270 |
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271 terminator = where + strlen(extension); |
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272 if (where == start || *(where - 1) == ' ') |
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273 if (*terminator == ' ' || *terminator == '\0') return 1; |
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274 |
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275 start = terminator; |
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276 } |
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277 |
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278 return 0; |
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279 } |
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280 |
| 0 | 281 /* Make the current context active */ |
| 282 int X11_GL_MakeCurrent(_THIS) | |
| 283 { | |
| 284 int retval; | |
|
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285 |
| 0 | 286 retval = 0; |
| 287 if ( ! this->gl_data->glXMakeCurrent(GFX_Display, | |
| 288 SDL_Window, glx_context) ) { | |
| 289 SDL_SetError("Unable to make GL context current"); | |
| 290 retval = -1; | |
| 291 } | |
| 292 XSync( GFX_Display, False ); | |
| 293 | |
|
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294 /* |
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295 * The context is now current, check for glXReleaseBuffersMESA() |
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296 * extension. If extension is _not_ supported, destroy the pointer |
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297 * (to make sure it will not be called in X11_GL_Shutdown() ). |
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298 * |
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299 * DRI/Mesa drivers include glXReleaseBuffersMESA() in the libGL.so, |
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300 * but there's no need to call it (is is only needed for some old |
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301 * non-DRI drivers). |
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302 * |
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303 * When using for example glew (http://glew.sf.net), dlsym() for |
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304 * glXReleaseBuffersMESA() returns the pointer from the glew library |
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305 * (namespace conflict). |
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306 * |
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307 * The glXReleaseBuffersMESA() pointer in the glew is NULL, if the |
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308 * driver doesn't support this extension. So blindly calling it will |
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309 * cause segfault with DRI/Mesa drivers! |
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310 * |
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311 */ |
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312 |
|
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313 if ( ! ExtensionSupported("glXReleaseBuffersMESA") ) { |
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314 this->gl_data->glXReleaseBuffersMESA = NULL; |
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315 } |
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316 |
| 0 | 317 /* More Voodoo X server workarounds... Grr... */ |
| 318 SDL_Lock_EventThread(); | |
| 319 X11_CheckDGAMouse(this); | |
| 320 SDL_Unlock_EventThread(); | |
| 321 | |
| 322 return(retval); | |
| 323 } | |
| 324 | |
| 325 /* Get attribute data from glX. */ | |
| 326 int X11_GL_GetAttribute(_THIS, SDL_GLattr attrib, int* value) | |
| 327 { | |
| 328 int retval; | |
| 329 int glx_attrib = None; | |
| 330 | |
| 331 switch( attrib ) { | |
| 332 case SDL_GL_RED_SIZE: | |
| 333 glx_attrib = GLX_RED_SIZE; | |
| 334 break; | |
| 335 case SDL_GL_GREEN_SIZE: | |
| 336 glx_attrib = GLX_GREEN_SIZE; | |
| 337 break; | |
| 338 case SDL_GL_BLUE_SIZE: | |
| 339 glx_attrib = GLX_BLUE_SIZE; | |
| 340 break; | |
| 341 case SDL_GL_ALPHA_SIZE: | |
| 342 glx_attrib = GLX_ALPHA_SIZE; | |
| 343 break; | |
| 344 case SDL_GL_DOUBLEBUFFER: | |
| 345 glx_attrib = GLX_DOUBLEBUFFER; | |
| 346 break; | |
| 347 case SDL_GL_BUFFER_SIZE: | |
| 348 glx_attrib = GLX_BUFFER_SIZE; | |
| 349 break; | |
| 350 case SDL_GL_DEPTH_SIZE: | |
| 351 glx_attrib = GLX_DEPTH_SIZE; | |
| 352 break; | |
| 353 case SDL_GL_STENCIL_SIZE: | |
| 354 glx_attrib = GLX_STENCIL_SIZE; | |
| 355 break; | |
| 356 case SDL_GL_ACCUM_RED_SIZE: | |
| 357 glx_attrib = GLX_ACCUM_RED_SIZE; | |
| 358 break; | |
| 359 case SDL_GL_ACCUM_GREEN_SIZE: | |
| 360 glx_attrib = GLX_ACCUM_GREEN_SIZE; | |
| 361 break; | |
| 362 case SDL_GL_ACCUM_BLUE_SIZE: | |
| 363 glx_attrib = GLX_ACCUM_BLUE_SIZE; | |
| 364 break; | |
| 365 case SDL_GL_ACCUM_ALPHA_SIZE: | |
| 366 glx_attrib = GLX_ACCUM_ALPHA_SIZE; | |
| 367 break; | |
|
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368 case SDL_GL_STEREO: |
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369 glx_attrib = GLX_STEREO; |
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370 break; |
|
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371 case SDL_GL_MULTISAMPLEBUFFERS: |
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372 glx_attrib = GLX_SAMPLE_BUFFERS_ARB; |
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373 break; |
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374 case SDL_GL_MULTISAMPLESAMPLES: |
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375 glx_attrib = GLX_SAMPLES_ARB; |
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376 break; |
| 0 | 377 default: |
| 378 return(-1); | |
| 379 } | |
| 380 | |
| 381 retval = this->gl_data->glXGetConfig(GFX_Display, glx_visualinfo, glx_attrib, value); | |
| 382 | |
| 383 return retval; | |
| 384 } | |
| 385 | |
| 386 void X11_GL_SwapBuffers(_THIS) | |
| 387 { | |
| 388 this->gl_data->glXSwapBuffers(GFX_Display, SDL_Window); | |
| 389 } | |
| 390 | |
| 391 #endif /* HAVE_OPENGL */ | |
| 392 | |
| 393 void X11_GL_UnloadLibrary(_THIS) | |
| 394 { | |
| 395 #ifdef HAVE_OPENGL | |
| 396 if ( this->gl_config.driver_loaded ) { | |
| 397 dlclose(this->gl_config.dll_handle); | |
| 398 | |
| 399 this->gl_data->glXGetProcAddress = NULL; | |
| 400 this->gl_data->glXChooseVisual = NULL; | |
| 401 this->gl_data->glXCreateContext = NULL; | |
| 402 this->gl_data->glXDestroyContext = NULL; | |
| 403 this->gl_data->glXMakeCurrent = NULL; | |
| 404 this->gl_data->glXSwapBuffers = NULL; | |
| 405 | |
| 406 this->gl_config.dll_handle = NULL; | |
| 407 this->gl_config.driver_loaded = 0; | |
| 408 } | |
| 409 #endif | |
| 410 } | |
| 411 | |
| 412 #ifdef HAVE_OPENGL | |
| 413 | |
| 414 /* Passing a NULL path means load pointers from the application */ | |
| 415 int X11_GL_LoadLibrary(_THIS, const char* path) | |
| 416 { | |
| 417 void* handle; | |
| 418 int dlopen_flags; | |
| 419 | |
| 420 if ( gl_active ) { | |
| 421 SDL_SetError("OpenGL context already created"); | |
| 422 return -1; | |
| 423 } | |
| 424 | |
| 425 #ifdef RTLD_GLOBAL | |
| 426 dlopen_flags = RTLD_LAZY | RTLD_GLOBAL; | |
| 427 #else | |
| 428 dlopen_flags = RTLD_LAZY; | |
| 429 #endif | |
| 430 handle = dlopen(path, dlopen_flags); | |
| 431 /* Catch the case where the application isn't linked with GL */ | |
| 432 if ( (dlsym(handle, "glXChooseVisual") == NULL) && (path == NULL) ) { | |
| 433 dlclose(handle); | |
| 434 path = getenv("SDL_VIDEO_GL_DRIVER"); | |
| 435 if ( path == NULL ) { | |
| 436 path = DEFAULT_OPENGL; | |
| 437 } | |
| 438 handle = dlopen(path, dlopen_flags); | |
| 439 } | |
| 440 if ( handle == NULL ) { | |
| 441 SDL_SetError("Could not load OpenGL library"); | |
| 442 return -1; | |
| 443 } | |
| 444 | |
| 445 /* Unload the old driver and reset the pointers */ | |
| 446 X11_GL_UnloadLibrary(this); | |
| 447 | |
| 448 /* Load new function pointers */ | |
|
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449 this->gl_data->glXGetProcAddress = |
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450 (void *(*)(const GLubyte *)) dlsym(handle, "glXGetProcAddressARB"); |
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451 this->gl_data->glXChooseVisual = |
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452 (XVisualInfo *(*)(Display *, int, int *)) dlsym(handle, "glXChooseVisual"); |
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453 this->gl_data->glXCreateContext = |
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454 (GLXContext (*)(Display *, XVisualInfo *, GLXContext, int)) dlsym(handle, "glXCreateContext"); |
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455 this->gl_data->glXDestroyContext = |
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456 (void (*)(Display *, GLXContext)) dlsym(handle, "glXDestroyContext"); |
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457 this->gl_data->glXMakeCurrent = |
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458 (int (*)(Display *, GLXDrawable, GLXContext)) dlsym(handle, "glXMakeCurrent"); |
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459 this->gl_data->glXSwapBuffers = |
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460 (void (*)(Display *, GLXDrawable)) dlsym(handle, "glXSwapBuffers"); |
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461 this->gl_data->glXGetConfig = |
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462 (int (*)(Display *, XVisualInfo *, int, int *)) dlsym(handle, "glXGetConfig"); |
|
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463 this->gl_data->glXQueryExtensionsString = |
|
646
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Fixed incorrect prototype for glXQueryExtensionsString()
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464 (const char *(*)(Display *, int)) dlsym(handle, "glXQueryExtensionsString"); |
|
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465 |
| 0 | 466 /* We don't compare below for this in case we're not using Mesa. */ |
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467 this->gl_data->glXReleaseBuffersMESA = |
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468 (void (*)(Display *, GLXDrawable)) dlsym( handle, "glXReleaseBuffersMESA" ); |
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469 |
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470 |
| 0 | 471 if ( (this->gl_data->glXChooseVisual == NULL) || |
| 472 (this->gl_data->glXCreateContext == NULL) || | |
| 473 (this->gl_data->glXDestroyContext == NULL) || | |
| 474 (this->gl_data->glXMakeCurrent == NULL) || | |
| 475 (this->gl_data->glXSwapBuffers == NULL) || | |
|
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476 (this->gl_data->glXGetConfig == NULL) || |
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477 (this->gl_data->glXQueryExtensionsString == NULL)) { |
| 0 | 478 SDL_SetError("Could not retrieve OpenGL functions"); |
| 479 return -1; | |
| 480 } | |
| 481 | |
| 482 this->gl_config.dll_handle = handle; | |
| 483 this->gl_config.driver_loaded = 1; | |
| 484 if ( path ) { | |
| 485 strncpy(this->gl_config.driver_path, path, | |
| 486 sizeof(this->gl_config.driver_path)-1); | |
| 487 } else { | |
| 488 strcpy(this->gl_config.driver_path, ""); | |
| 489 } | |
| 490 return 0; | |
| 491 } | |
| 492 | |
| 493 void *X11_GL_GetProcAddress(_THIS, const char* proc) | |
| 494 { | |
|
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495 static char procname[1024]; |
| 0 | 496 void* handle; |
|
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497 void* retval; |
| 0 | 498 |
| 499 handle = this->gl_config.dll_handle; | |
| 500 if ( this->gl_data->glXGetProcAddress ) { | |
|
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501 return this->gl_data->glXGetProcAddress(proc); |
| 0 | 502 } |
|
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503 #if defined(__OpenBSD__) && !defined(__ELF__) |
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504 #undef dlsym(x,y); |
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505 #endif |
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506 retval = dlsym(handle, proc); |
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507 if (!retval && strlen(proc) <= 1022) { |
|
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508 procname[0] = '_'; |
|
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509 strcpy(procname + 1, proc); |
|
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510 retval = dlsym(handle, procname); |
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511 } |
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512 return retval; |
| 0 | 513 } |
| 514 | |
| 515 #endif /* HAVE_OPENGL */ |