glx_api.c revision 7be3e507317a0e731fef91a1505f8500e8d1c050 
1/*
2 * Mesa 3-D graphics library
3 * Version:  7.6
4 *
5 * Copyright (C) 1999-2007  Brian Paul   All Rights Reserved.
6 * Copyright (C) 2009  VMware, Inc.  All Rights Reserved.
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a
9 * copy of this software and associated documentation files (the "Software"),
10 * to deal in the Software without restriction, including without limitation
11 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
12 * and/or sell copies of the Software, and to permit persons to whom the
13 * Software is furnished to do so, subject to the following conditions:
14 *
15 * The above copyright notice and this permission notice shall be included
16 * in all copies or substantial portions of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
21 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
22 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
23 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
24 */
25
26
27/**
28 * "Fake" GLX API implemented in terms of the XMesa*() functions.
29 */
30
31
32
33#define GLX_GLXEXT_PROTOTYPES
34#include "GL/glx.h"
35
36#include "xm_api.h"
37
38
39/* This indicates the client-side GLX API and GLX encoder version. */
40#define CLIENT_MAJOR_VERSION 1
41#define CLIENT_MINOR_VERSION 4  /* but don't have 1.3's pbuffers, etc yet */
42
43/* This indicates the server-side GLX decoder version.
44 * GLX 1.4 indicates OpenGL 1.3 support
45 */
46#define SERVER_MAJOR_VERSION 1
47#define SERVER_MINOR_VERSION 4
48
49/* Who implemented this GLX? */
50#define VENDOR "Brian Paul"
51
52#define EXTENSIONS \
53   "GLX_MESA_copy_sub_buffer " \
54   "GLX_MESA_pixmap_colormap " \
55   "GLX_MESA_release_buffers " \
56   "GLX_ARB_get_proc_address " \
57   "GLX_EXT_texture_from_pixmap " \
58   "GLX_EXT_visual_info " \
59   "GLX_EXT_visual_rating " \
60   /*"GLX_SGI_video_sync "*/ \
61   "GLX_SGIX_fbconfig " \
62   "GLX_SGIX_pbuffer "
63
64#define DEFAULT_DIRECT GL_TRUE
65
66
67
68/**
69 * The GLXContext typedef is defined as a pointer to this structure.
70 */
71struct __GLXcontextRec
72{
73   Display *currentDpy;
74   GLboolean isDirect;
75   GLXDrawable currentDrawable;
76   GLXDrawable currentReadable;
77   XID xid;
78
79   XMesaContext xmesaContext;
80};
81
82
83
84static pipe_tsd ContextTSD;
85
86/** Set current context for calling thread */
87static void
88SetCurrentContext(GLXContext c)
89{
90   pipe_tsd_set(&ContextTSD, c);
91}
92
93/** Get current context for calling thread */
94static GLXContext
95GetCurrentContext(void)
96{
97   return pipe_tsd_get(&ContextTSD);
98}
99
100
101
102/**********************************************************************/
103/***                       GLX Visual Code                          ***/
104/**********************************************************************/
105
106#define DONT_CARE -1
107
108
109static XMesaVisual *VisualTable = NULL;
110static int NumVisuals = 0;
111
112
113
114/* Macro to handle c_class vs class field name in XVisualInfo struct */
115#if defined(__cplusplus) || defined(c_plusplus)
116#define CLASS c_class
117#else
118#define CLASS class
119#endif
120
121
122
123/*
124 * Test if the given XVisualInfo is usable for Mesa rendering.
125 */
126static GLboolean
127is_usable_visual( XVisualInfo *vinfo )
128{
129   switch (vinfo->CLASS) {
130      case StaticGray:
131      case GrayScale:
132         /* Any StaticGray/GrayScale visual works in RGB or CI mode */
133         return GL_TRUE;
134      case StaticColor:
135      case PseudoColor:
136	 /* Any StaticColor/PseudoColor visual of at least 4 bits */
137	 if (vinfo->depth>=4) {
138	    return GL_TRUE;
139	 }
140	 else {
141	    return GL_FALSE;
142	 }
143      case TrueColor:
144      case DirectColor:
145	 /* Any depth of TrueColor or DirectColor works in RGB mode */
146	 return GL_TRUE;
147      default:
148	 /* This should never happen */
149	 return GL_FALSE;
150   }
151}
152
153
154/*
155 * Given an XVisualInfo and RGB, Double, and Depth buffer flags, save the
156 * configuration in our list of GLX visuals.
157 */
158static XMesaVisual
159save_glx_visual( Display *dpy, XVisualInfo *vinfo,
160                 GLboolean rgbFlag, GLboolean alphaFlag, GLboolean dbFlag,
161                 GLboolean stereoFlag,
162                 GLint depth_size, GLint stencil_size,
163                 GLint accumRedSize, GLint accumGreenSize,
164                 GLint accumBlueSize, GLint accumAlphaSize,
165                 GLint level, GLint numAuxBuffers )
166{
167   GLboolean ximageFlag = GL_TRUE;
168   XMesaVisual xmvis;
169   GLint i;
170   GLboolean comparePointers;
171
172   if (dbFlag) {
173      /* Check if the MESA_BACK_BUFFER env var is set */
174      char *backbuffer = _mesa_getenv("MESA_BACK_BUFFER");
175      if (backbuffer) {
176         if (backbuffer[0]=='p' || backbuffer[0]=='P') {
177            ximageFlag = GL_FALSE;
178         }
179         else if (backbuffer[0]=='x' || backbuffer[0]=='X') {
180            ximageFlag = GL_TRUE;
181         }
182         else {
183            _mesa_warning(NULL, "Mesa: invalid value for MESA_BACK_BUFFER environment variable, using an XImage.");
184         }
185      }
186   }
187
188   if (stereoFlag) {
189      /* stereo not supported */
190      return NULL;
191   }
192
193   if (stencil_size > 0 && depth_size > 0)
194      depth_size = 24;
195
196   /* Comparing IDs uses less memory but sometimes fails. */
197   /* XXX revisit this after 3.0 is finished. */
198   if (_mesa_getenv("MESA_GLX_VISUAL_HACK"))
199      comparePointers = GL_TRUE;
200   else
201      comparePointers = GL_FALSE;
202
203   /* Force the visual to have an alpha channel */
204   if (rgbFlag && _mesa_getenv("MESA_GLX_FORCE_ALPHA"))
205      alphaFlag = GL_TRUE;
206
207   /* First check if a matching visual is already in the list */
208   for (i=0; i<NumVisuals; i++) {
209      XMesaVisual v = VisualTable[i];
210      if (v->display == dpy
211          && v->mesa_visual.level == level
212          && v->mesa_visual.numAuxBuffers == numAuxBuffers
213          && v->ximage_flag == ximageFlag
214          && v->mesa_visual.rgbMode == rgbFlag
215          && v->mesa_visual.doubleBufferMode == dbFlag
216          && v->mesa_visual.stereoMode == stereoFlag
217          && (v->mesa_visual.alphaBits > 0) == alphaFlag
218          && (v->mesa_visual.depthBits >= depth_size || depth_size == 0)
219          && (v->mesa_visual.stencilBits >= stencil_size || stencil_size == 0)
220          && (v->mesa_visual.accumRedBits >= accumRedSize || accumRedSize == 0)
221          && (v->mesa_visual.accumGreenBits >= accumGreenSize || accumGreenSize == 0)
222          && (v->mesa_visual.accumBlueBits >= accumBlueSize || accumBlueSize == 0)
223          && (v->mesa_visual.accumAlphaBits >= accumAlphaSize || accumAlphaSize == 0)) {
224         /* now either compare XVisualInfo pointers or visual IDs */
225         if ((!comparePointers && v->visinfo->visualid == vinfo->visualid)
226             || (comparePointers && v->vishandle == vinfo)) {
227            return v;
228         }
229      }
230   }
231
232   /* Create a new visual and add it to the list. */
233
234   xmvis = XMesaCreateVisual( dpy, vinfo, rgbFlag, alphaFlag, dbFlag,
235                              stereoFlag, ximageFlag,
236                              depth_size, stencil_size,
237                              accumRedSize, accumBlueSize,
238                              accumBlueSize, accumAlphaSize, 0, level,
239                              GLX_NONE_EXT );
240   if (xmvis) {
241      /* Save a copy of the pointer now so we can find this visual again
242       * if we need to search for it in find_glx_visual().
243       */
244      xmvis->vishandle = vinfo;
245      /* Allocate more space for additional visual */
246      VisualTable = (XMesaVisual *) _mesa_realloc( VisualTable,
247                                   sizeof(XMesaVisual) * NumVisuals,
248                                   sizeof(XMesaVisual) * (NumVisuals + 1));
249      /* add xmvis to the list */
250      VisualTable[NumVisuals] = xmvis;
251      NumVisuals++;
252      /* XXX minor hack, because XMesaCreateVisual doesn't support an
253       * aux buffers parameter.
254       */
255      xmvis->mesa_visual.numAuxBuffers = numAuxBuffers;
256   }
257   return xmvis;
258}
259
260
261/**
262 * Return the default number of bits for the Z buffer.
263 * If defined, use the MESA_GLX_DEPTH_BITS env var value.
264 * Otherwise, use the DEFAULT_SOFTWARE_DEPTH_BITS constant.
265 * XXX probably do the same thing for stencil, accum, etc.
266 */
267static GLint
268default_depth_bits(void)
269{
270   int zBits;
271   const char *zEnv = _mesa_getenv("MESA_GLX_DEPTH_BITS");
272   if (zEnv)
273      zBits = atoi(zEnv);
274   else
275      zBits = DEFAULT_SOFTWARE_DEPTH_BITS;
276   return zBits;
277}
278
279static GLint
280default_alpha_bits(void)
281{
282   int aBits;
283   const char *aEnv = _mesa_getenv("MESA_GLX_ALPHA_BITS");
284   if (aEnv)
285      aBits = atoi(aEnv);
286   else
287      aBits = 0;
288   return aBits;
289}
290
291static GLint
292default_accum_bits(void)
293{
294   return 16;
295}
296
297
298
299/*
300 * Create a GLX visual from a regular XVisualInfo.
301 * This is called when Fake GLX is given an XVisualInfo which wasn't
302 * returned by glXChooseVisual.  Since this is the first time we're
303 * considering this visual we'll take a guess at reasonable values
304 * for depth buffer size, stencil size, accum size, etc.
305 * This is the best we can do with a client-side emulation of GLX.
306 */
307static XMesaVisual
308create_glx_visual( Display *dpy, XVisualInfo *visinfo )
309{
310   GLint zBits = default_depth_bits();
311   GLint accBits = default_accum_bits();
312   GLboolean alphaFlag = default_alpha_bits() > 0;
313
314   if (is_usable_visual( visinfo )) {
315      /* Configure this visual as RGB, double-buffered, depth-buffered. */
316      /* This is surely wrong for some people's needs but what else */
317      /* can be done?  They should use glXChooseVisual(). */
318      return save_glx_visual( dpy, visinfo,
319                              GL_TRUE,   /* rgb */
320                              alphaFlag, /* alpha */
321                              GL_TRUE,   /* double */
322                              GL_FALSE,  /* stereo */
323                              zBits,
324                              STENCIL_BITS,
325                              accBits, /* r */
326                              accBits, /* g */
327                              accBits, /* b */
328                              accBits, /* a */
329                              0,         /* level */
330                              0          /* numAux */
331         );
332   }
333   else {
334      _mesa_warning(NULL, "Mesa: error in glXCreateContext: bad visual\n");
335      return NULL;
336   }
337}
338
339
340
341/*
342 * Find the GLX visual associated with an XVisualInfo.
343 */
344static XMesaVisual
345find_glx_visual( Display *dpy, XVisualInfo *vinfo )
346{
347   int i;
348
349   /* try to match visual id */
350   for (i=0;i<NumVisuals;i++) {
351      if (VisualTable[i]->display==dpy
352          && VisualTable[i]->visinfo->visualid == vinfo->visualid) {
353         return VisualTable[i];
354      }
355   }
356
357   /* if that fails, try to match pointers */
358   for (i=0;i<NumVisuals;i++) {
359      if (VisualTable[i]->display==dpy && VisualTable[i]->vishandle==vinfo) {
360         return VisualTable[i];
361      }
362   }
363
364   return NULL;
365}
366
367
368/**
369 * Try to get an X visual which matches the given arguments.
370 */
371static XVisualInfo *
372get_visual( Display *dpy, int scr, unsigned int depth, int xclass )
373{
374   XVisualInfo temp, *vis;
375   long mask;
376   int n;
377   unsigned int default_depth;
378   int default_class;
379
380   mask = VisualScreenMask | VisualDepthMask | VisualClassMask;
381   temp.screen = scr;
382   temp.depth = depth;
383   temp.CLASS = xclass;
384
385   default_depth = DefaultDepth(dpy,scr);
386   default_class = DefaultVisual(dpy,scr)->CLASS;
387
388   if (depth==default_depth && xclass==default_class) {
389      /* try to get root window's visual */
390      temp.visualid = DefaultVisual(dpy,scr)->visualid;
391      mask |= VisualIDMask;
392   }
393
394   vis = XGetVisualInfo( dpy, mask, &temp, &n );
395
396   /* In case bits/pixel > 24, make sure color channels are still <=8 bits.
397    * An SGI Infinite Reality system, for example, can have 30bpp pixels:
398    * 10 bits per color channel.  Mesa's limited to a max of 8 bits/channel.
399    */
400   if (vis && depth > 24 && (xclass==TrueColor || xclass==DirectColor)) {
401      if (_mesa_bitcount((GLuint) vis->red_mask  ) <= 8 &&
402          _mesa_bitcount((GLuint) vis->green_mask) <= 8 &&
403          _mesa_bitcount((GLuint) vis->blue_mask ) <= 8) {
404         return vis;
405      }
406      else {
407         XFree((void *) vis);
408         return NULL;
409      }
410   }
411
412   return vis;
413}
414
415
416/*
417 * Retrieve the value of the given environment variable and find
418 * the X visual which matches it.
419 * Input:  dpy - the display
420 *         screen - the screen number
421 *         varname - the name of the environment variable
422 * Return:  an XVisualInfo pointer to NULL if error.
423 */
424static XVisualInfo *
425get_env_visual(Display *dpy, int scr, const char *varname)
426{
427   char value[100], type[100];
428   int depth, xclass = -1;
429   XVisualInfo *vis;
430
431   if (!_mesa_getenv( varname )) {
432      return NULL;
433   }
434
435   strncpy( value, _mesa_getenv(varname), 100 );
436   value[99] = 0;
437
438   sscanf( value, "%s %d", type, &depth );
439
440   if (strcmp(type,"TrueColor")==0)          xclass = TrueColor;
441   else if (strcmp(type,"DirectColor")==0)   xclass = DirectColor;
442   else if (strcmp(type,"PseudoColor")==0)   xclass = PseudoColor;
443   else if (strcmp(type,"StaticColor")==0)   xclass = StaticColor;
444   else if (strcmp(type,"GrayScale")==0)     xclass = GrayScale;
445   else if (strcmp(type,"StaticGray")==0)    xclass = StaticGray;
446
447   if (xclass>-1 && depth>0) {
448      vis = get_visual( dpy, scr, depth, xclass );
449      if (vis) {
450	 return vis;
451      }
452   }
453
454   _mesa_warning(NULL, "GLX unable to find visual class=%s, depth=%d.",
455                 type, depth);
456
457   return NULL;
458}
459
460
461
462/*
463 * Select an X visual which satisfies the RGBA flag and minimum depth.
464 * Input:  dpy,
465 *         screen - X display and screen number
466 *         min_depth - minimum visual depth
467 *         preferred_class - preferred GLX visual class or DONT_CARE
468 * Return:  pointer to an XVisualInfo or NULL.
469 */
470static XVisualInfo *
471choose_x_visual( Display *dpy, int screen, int min_depth,
472                 int preferred_class )
473{
474   XVisualInfo *vis;
475   int xclass, visclass = 0;
476   int depth;
477
478   /* First see if the MESA_RGB_VISUAL env var is defined */
479   vis = get_env_visual( dpy, screen, "MESA_RGB_VISUAL" );
480   if (vis) {
481      return vis;
482   }
483   /* Otherwise, search for a suitable visual */
484   if (preferred_class==DONT_CARE) {
485      for (xclass=0;xclass<6;xclass++) {
486         switch (xclass) {
487         case 0:  visclass = TrueColor;    break;
488         case 1:  visclass = DirectColor;  break;
489         case 2:  visclass = PseudoColor;  break;
490         case 3:  visclass = StaticColor;  break;
491         case 4:  visclass = GrayScale;    break;
492         case 5:  visclass = StaticGray;   break;
493         }
494         if (min_depth==0) {
495            /* start with shallowest */
496            for (depth=0;depth<=32;depth++) {
497               if (visclass==TrueColor && depth==8) {
498                  /* Special case:  try to get 8-bit PseudoColor before */
499                  /* 8-bit TrueColor */
500                  vis = get_visual( dpy, screen, 8, PseudoColor );
501                  if (vis) {
502                     return vis;
503                  }
504               }
505               vis = get_visual( dpy, screen, depth, visclass );
506               if (vis) {
507                  return vis;
508               }
509            }
510         }
511         else {
512            /* start with deepest */
513            for (depth=32;depth>=min_depth;depth--) {
514               if (visclass==TrueColor && depth==8) {
515                  /* Special case:  try to get 8-bit PseudoColor before */
516                  /* 8-bit TrueColor */
517                  vis = get_visual( dpy, screen, 8, PseudoColor );
518                  if (vis) {
519                     return vis;
520                  }
521               }
522               vis = get_visual( dpy, screen, depth, visclass );
523               if (vis) {
524                  return vis;
525               }
526            }
527         }
528      }
529   }
530   else {
531      /* search for a specific visual class */
532      switch (preferred_class) {
533      case GLX_TRUE_COLOR_EXT:    visclass = TrueColor;    break;
534      case GLX_DIRECT_COLOR_EXT:  visclass = DirectColor;  break;
535      case GLX_PSEUDO_COLOR_EXT:  visclass = PseudoColor;  break;
536      case GLX_STATIC_COLOR_EXT:  visclass = StaticColor;  break;
537      case GLX_GRAY_SCALE_EXT:    visclass = GrayScale;    break;
538      case GLX_STATIC_GRAY_EXT:   visclass = StaticGray;   break;
539      default:   return NULL;
540      }
541      if (min_depth==0) {
542         /* start with shallowest */
543         for (depth=0;depth<=32;depth++) {
544            vis = get_visual( dpy, screen, depth, visclass );
545            if (vis) {
546               return vis;
547            }
548         }
549      }
550      else {
551         /* start with deepest */
552         for (depth=32;depth>=min_depth;depth--) {
553            vis = get_visual( dpy, screen, depth, visclass );
554            if (vis) {
555               return vis;
556            }
557         }
558      }
559   }
560
561   /* didn't find a visual */
562   return NULL;
563}
564
565
566
567
568/**********************************************************************/
569/***             Display-related functions                          ***/
570/**********************************************************************/
571
572
573/**
574 * Free all XMesaVisuals which are associated with the given display.
575 */
576static void
577destroy_visuals_on_display(Display *dpy)
578{
579   int i;
580   for (i = 0; i < NumVisuals; i++) {
581      if (VisualTable[i]->display == dpy) {
582         /* remove this visual */
583         int j;
584         free(VisualTable[i]);
585         for (j = i; j < NumVisuals - 1; j++)
586            VisualTable[j] = VisualTable[j + 1];
587         NumVisuals--;
588      }
589   }
590}
591
592
593/**
594 * Called from XCloseDisplay() to let us free our display-related data.
595 */
596static int
597close_display_callback(Display *dpy, XExtCodes *codes)
598{
599   xmesa_destroy_buffers_on_display(dpy);
600   destroy_visuals_on_display(dpy);
601   return 0;
602}
603
604
605/**
606 * Look for the named extension on given display and return a pointer
607 * to the _XExtension data, or NULL if extension not found.
608 */
609static _XExtension *
610lookup_extension(Display *dpy, const char *extName)
611{
612   _XExtension *ext;
613   for (ext = dpy->ext_procs; ext; ext = ext->next) {
614      if (ext->name && strcmp(ext->name, extName) == 0) {
615         return ext;
616      }
617   }
618   return NULL;
619}
620
621
622/**
623 * Whenever we're given a new Display pointer, call this function to
624 * register our close_display_callback function.
625 */
626static void
627register_with_display(Display *dpy)
628{
629   const char *extName = "MesaGLX";
630   _XExtension *ext;
631
632   ext = lookup_extension(dpy, extName);
633   if (!ext) {
634      XExtCodes *c = XAddExtension(dpy);
635      ext = dpy->ext_procs;  /* new extension is at head of list */
636      assert(c->extension == ext->codes.extension);
637      (void) c;
638      ext->name = _mesa_strdup(extName);
639      ext->close_display = close_display_callback;
640   }
641}
642
643
644/**********************************************************************/
645/***                  Begin Fake GLX API Functions                  ***/
646/**********************************************************************/
647
648
649/**
650 * Helper used by glXChooseVisual and glXChooseFBConfig.
651 * The fbConfig parameter must be GL_FALSE for the former and GL_TRUE for
652 * the later.
653 * In either case, the attribute list is terminated with the value 'None'.
654 */
655static XMesaVisual
656choose_visual( Display *dpy, int screen, const int *list, GLboolean fbConfig )
657{
658   const GLboolean rgbModeDefault = fbConfig;
659   const int *parselist;
660   XVisualInfo *vis;
661   int min_ci = 0;
662   int min_red=0, min_green=0, min_blue=0;
663   GLboolean rgb_flag = rgbModeDefault;
664   GLboolean alpha_flag = GL_FALSE;
665   GLboolean double_flag = GL_FALSE;
666   GLboolean stereo_flag = GL_FALSE;
667   GLint depth_size = 0;
668   GLint stencil_size = 0;
669   GLint accumRedSize = 0;
670   GLint accumGreenSize = 0;
671   GLint accumBlueSize = 0;
672   GLint accumAlphaSize = 0;
673   int level = 0;
674   int visual_type = DONT_CARE;
675   int trans_type = DONT_CARE;
676   int trans_value = DONT_CARE;
677   GLint caveat = DONT_CARE;
678   XMesaVisual xmvis = NULL;
679   int desiredVisualID = -1;
680   int numAux = 0;
681
682   xmesa_init( dpy );
683
684   parselist = list;
685
686   while (*parselist) {
687
688      switch (*parselist) {
689	 case GLX_USE_GL:
690            if (fbConfig) {
691               /* invalid token */
692               return NULL;
693            }
694            else {
695               /* skip */
696               parselist++;
697            }
698	    break;
699	 case GLX_BUFFER_SIZE:
700	    parselist++;
701	    min_ci = *parselist++;
702	    break;
703	 case GLX_LEVEL:
704	    parselist++;
705            level = *parselist++;
706	    break;
707	 case GLX_RGBA:
708            if (fbConfig) {
709               /* invalid token */
710               return NULL;
711            }
712            else {
713               rgb_flag = GL_TRUE;
714               parselist++;
715            }
716	    break;
717	 case GLX_DOUBLEBUFFER:
718            parselist++;
719            if (fbConfig) {
720               double_flag = *parselist++;
721            }
722            else {
723               double_flag = GL_TRUE;
724            }
725	    break;
726	 case GLX_STEREO:
727            parselist++;
728            if (fbConfig) {
729               stereo_flag = *parselist++;
730            }
731            else {
732               stereo_flag = GL_TRUE;
733            }
734            break;
735	 case GLX_AUX_BUFFERS:
736	    parselist++;
737            numAux = *parselist++;
738            if (numAux > MAX_AUX_BUFFERS)
739               return NULL;
740	    break;
741	 case GLX_RED_SIZE:
742	    parselist++;
743	    min_red = *parselist++;
744	    break;
745	 case GLX_GREEN_SIZE:
746	    parselist++;
747	    min_green = *parselist++;
748	    break;
749	 case GLX_BLUE_SIZE:
750	    parselist++;
751	    min_blue = *parselist++;
752	    break;
753	 case GLX_ALPHA_SIZE:
754	    parselist++;
755            {
756               GLint size = *parselist++;
757               alpha_flag = size ? GL_TRUE : GL_FALSE;
758            }
759	    break;
760	 case GLX_DEPTH_SIZE:
761	    parselist++;
762	    depth_size = *parselist++;
763	    break;
764	 case GLX_STENCIL_SIZE:
765	    parselist++;
766	    stencil_size = *parselist++;
767	    break;
768	 case GLX_ACCUM_RED_SIZE:
769	    parselist++;
770            {
771               GLint size = *parselist++;
772               accumRedSize = MAX2( accumRedSize, size );
773            }
774            break;
775	 case GLX_ACCUM_GREEN_SIZE:
776	    parselist++;
777            {
778               GLint size = *parselist++;
779               accumGreenSize = MAX2( accumGreenSize, size );
780            }
781            break;
782	 case GLX_ACCUM_BLUE_SIZE:
783	    parselist++;
784            {
785               GLint size = *parselist++;
786               accumBlueSize = MAX2( accumBlueSize, size );
787            }
788            break;
789	 case GLX_ACCUM_ALPHA_SIZE:
790	    parselist++;
791            {
792               GLint size = *parselist++;
793               accumAlphaSize = MAX2( accumAlphaSize, size );
794            }
795	    break;
796
797         /*
798          * GLX_EXT_visual_info extension
799          */
800         case GLX_X_VISUAL_TYPE_EXT:
801            parselist++;
802            visual_type = *parselist++;
803            break;
804         case GLX_TRANSPARENT_TYPE_EXT:
805            parselist++;
806            trans_type = *parselist++;
807            break;
808         case GLX_TRANSPARENT_INDEX_VALUE_EXT:
809            parselist++;
810            trans_value = *parselist++;
811            break;
812         case GLX_TRANSPARENT_RED_VALUE_EXT:
813         case GLX_TRANSPARENT_GREEN_VALUE_EXT:
814         case GLX_TRANSPARENT_BLUE_VALUE_EXT:
815         case GLX_TRANSPARENT_ALPHA_VALUE_EXT:
816	    /* ignore */
817	    parselist++;
818	    parselist++;
819	    break;
820
821         /*
822          * GLX_EXT_visual_info extension
823          */
824         case GLX_VISUAL_CAVEAT_EXT:
825            parselist++;
826            caveat = *parselist++; /* ignored for now */
827            break;
828
829         /*
830          * GLX_ARB_multisample
831          */
832         case GLX_SAMPLE_BUFFERS_ARB:
833            /* ms not supported */
834            return NULL;
835         case GLX_SAMPLES_ARB:
836            /* ms not supported */
837            return NULL;
838
839         /*
840          * FBConfig attribs.
841          */
842         case GLX_RENDER_TYPE:
843            if (!fbConfig)
844               return NULL;
845            parselist++;
846            if (*parselist & GLX_RGBA_BIT) {
847               rgb_flag = GL_TRUE;
848            }
849            else if (*parselist & GLX_COLOR_INDEX_BIT) {
850               rgb_flag = GL_FALSE;
851            }
852            else if (*parselist == 0) {
853               rgb_flag = GL_TRUE;
854            }
855            parselist++;
856            break;
857         case GLX_DRAWABLE_TYPE:
858            if (!fbConfig)
859               return NULL;
860            parselist++;
861            if (*parselist & ~(GLX_WINDOW_BIT | GLX_PIXMAP_BIT | GLX_PBUFFER_BIT)) {
862               return NULL; /* bad bit */
863            }
864            parselist++;
865            break;
866         case GLX_FBCONFIG_ID:
867            if (!fbConfig)
868               return NULL;
869            parselist++;
870            desiredVisualID = *parselist++;
871            break;
872         case GLX_X_RENDERABLE:
873            if (!fbConfig)
874               return NULL;
875            parselist += 2;
876            /* ignore */
877            break;
878
879#ifdef GLX_EXT_texture_from_pixmap
880         case GLX_BIND_TO_TEXTURE_RGB_EXT:
881            parselist++; /*skip*/
882            break;
883         case GLX_BIND_TO_TEXTURE_RGBA_EXT:
884            parselist++; /*skip*/
885            break;
886         case GLX_BIND_TO_MIPMAP_TEXTURE_EXT:
887            parselist++; /*skip*/
888            break;
889         case GLX_BIND_TO_TEXTURE_TARGETS_EXT:
890            parselist++;
891            if (*parselist & ~(GLX_TEXTURE_1D_BIT_EXT |
892                               GLX_TEXTURE_2D_BIT_EXT |
893                               GLX_TEXTURE_RECTANGLE_BIT_EXT)) {
894               /* invalid bit */
895               return NULL;
896            }
897            break;
898         case GLX_Y_INVERTED_EXT:
899            parselist++; /*skip*/
900            break;
901#endif
902
903	 case None:
904            /* end of list */
905	    break;
906
907	 default:
908	    /* undefined attribute */
909            _mesa_warning(NULL, "unexpected attrib 0x%x in choose_visual()",
910                          *parselist);
911	    return NULL;
912      }
913   }
914
915   (void) caveat;
916
917
918   /*
919    * Since we're only simulating the GLX extension this function will never
920    * find any real GL visuals.  Instead, all we can do is try to find an RGB
921    * or CI visual of appropriate depth.  Other requested attributes such as
922    * double buffering, depth buffer, etc. will be associated with the X
923    * visual and stored in the VisualTable[].
924    */
925   if (desiredVisualID != -1) {
926      /* try to get a specific visual, by visualID */
927      XVisualInfo temp;
928      int n;
929      temp.visualid = desiredVisualID;
930      temp.screen = screen;
931      vis = XGetVisualInfo(dpy, VisualIDMask | VisualScreenMask, &temp, &n);
932      if (vis) {
933         /* give the visual some useful GLX attributes */
934         double_flag = GL_TRUE;
935         rgb_flag = GL_TRUE;
936      }
937   }
938   else if (level==0) {
939      /* normal color planes */
940      /* Get an RGB visual */
941      int min_rgb = min_red + min_green + min_blue;
942      if (min_rgb>1 && min_rgb<8) {
943         /* a special case to be sure we can get a monochrome visual */
944         min_rgb = 1;
945      }
946      vis = choose_x_visual( dpy, screen, min_rgb, visual_type );
947   }
948   else {
949      _mesa_warning(NULL, "overlay not supported");
950      return NULL;
951   }
952
953   if (vis) {
954      /* Note: we're not exactly obeying the glXChooseVisual rules here.
955       * When GLX_DEPTH_SIZE = 1 is specified we're supposed to choose the
956       * largest depth buffer size, which is 32bits/value.  Instead, we
957       * return 16 to maintain performance with earlier versions of Mesa.
958       */
959      if (stencil_size > 0)
960         depth_size = 24;  /* if Z and stencil, always use 24+8 format */
961      else if (depth_size > 24)
962         depth_size = 32;
963      else if (depth_size > 16)
964         depth_size = 24;
965      else if (depth_size > 0) {
966         depth_size = default_depth_bits();
967      }
968
969      if (!alpha_flag) {
970         alpha_flag = default_alpha_bits() > 0;
971      }
972
973      /* we only support one size of stencil and accum buffers. */
974      if (stencil_size > 0)
975         stencil_size = STENCIL_BITS;
976
977      if (accumRedSize > 0 ||
978          accumGreenSize > 0 ||
979          accumBlueSize > 0 ||
980          accumAlphaSize > 0) {
981
982         accumRedSize =
983            accumGreenSize =
984            accumBlueSize = default_accum_bits();
985
986         accumAlphaSize = alpha_flag ? accumRedSize : 0;
987      }
988
989      xmvis = save_glx_visual( dpy, vis, rgb_flag, alpha_flag, double_flag,
990                               stereo_flag, depth_size, stencil_size,
991                               accumRedSize, accumGreenSize,
992                               accumBlueSize, accumAlphaSize, level, numAux );
993   }
994
995   return xmvis;
996}
997
998
999PUBLIC XVisualInfo *
1000glXChooseVisual( Display *dpy, int screen, int *list )
1001{
1002   XMesaVisual xmvis;
1003
1004   /* register ourselves as an extension on this display */
1005   register_with_display(dpy);
1006
1007   xmvis = choose_visual(dpy, screen, list, GL_FALSE);
1008   if (xmvis) {
1009      /* create a new vishandle - the cached one may be stale */
1010      xmvis->vishandle = (XVisualInfo *) malloc(sizeof(XVisualInfo));
1011      if (xmvis->vishandle) {
1012         memcpy(xmvis->vishandle, xmvis->visinfo, sizeof(XVisualInfo));
1013      }
1014      return xmvis->vishandle;
1015   }
1016   else
1017      return NULL;
1018}
1019
1020
1021/**
1022 * Helper function used by other glXCreateContext functions.
1023 */
1024static GLXContext
1025create_context(Display *dpy, XMesaVisual xmvis,
1026               XMesaContext shareCtx, Bool direct)
1027{
1028   GLXContext glxCtx;
1029
1030   if (!dpy || !xmvis)
1031      return 0;
1032
1033   glxCtx = CALLOC_STRUCT(__GLXcontextRec);
1034   if (!glxCtx)
1035      return 0;
1036
1037   /* deallocate unused windows/buffers */
1038#if 0
1039   XMesaGarbageCollect();
1040#endif
1041
1042   glxCtx->xmesaContext = XMesaCreateContext(xmvis, shareCtx);
1043   if (!glxCtx->xmesaContext) {
1044      free(glxCtx);
1045      return NULL;
1046   }
1047
1048   glxCtx->isDirect = DEFAULT_DIRECT;
1049   glxCtx->currentDpy = dpy;
1050   glxCtx->xid = (XID) glxCtx;  /* self pointer */
1051
1052   return glxCtx;
1053}
1054
1055
1056PUBLIC GLXContext
1057glXCreateContext( Display *dpy, XVisualInfo *visinfo,
1058                  GLXContext shareCtx, Bool direct )
1059{
1060   XMesaVisual xmvis;
1061
1062   xmvis = find_glx_visual( dpy, visinfo );
1063   if (!xmvis) {
1064      /* This visual wasn't found with glXChooseVisual() */
1065      xmvis = create_glx_visual( dpy, visinfo );
1066      if (!xmvis) {
1067         /* unusable visual */
1068         return NULL;
1069      }
1070   }
1071
1072   return create_context(dpy, xmvis,
1073                         shareCtx ? shareCtx->xmesaContext : NULL,
1074                         direct);
1075}
1076
1077
1078/* XXX these may have to be removed due to thread-safety issues. */
1079static GLXContext MakeCurrent_PrevContext = 0;
1080static GLXDrawable MakeCurrent_PrevDrawable = 0;
1081static GLXDrawable MakeCurrent_PrevReadable = 0;
1082static XMesaBuffer MakeCurrent_PrevDrawBuffer = 0;
1083static XMesaBuffer MakeCurrent_PrevReadBuffer = 0;
1084
1085
1086/* GLX 1.3 and later */
1087PUBLIC Bool
1088glXMakeContextCurrent( Display *dpy, GLXDrawable draw,
1089                       GLXDrawable read, GLXContext ctx )
1090{
1091   GLXContext glxCtx = ctx;
1092   static boolean firsttime = 1, no_rast = 0;
1093
1094   if (firsttime) {
1095      no_rast = getenv("SP_NO_RAST") != NULL;
1096      firsttime = 0;
1097   }
1098
1099   if (ctx && draw && read) {
1100      XMesaBuffer drawBuffer, readBuffer;
1101      XMesaContext xmctx = glxCtx->xmesaContext;
1102
1103      /* Find the XMesaBuffer which corresponds to the GLXDrawable 'draw' */
1104      if (ctx == MakeCurrent_PrevContext
1105          && draw == MakeCurrent_PrevDrawable) {
1106         drawBuffer = MakeCurrent_PrevDrawBuffer;
1107      }
1108      else {
1109         drawBuffer = XMesaFindBuffer( dpy, draw );
1110      }
1111      if (!drawBuffer) {
1112         /* drawable must be a new window! */
1113         drawBuffer = XMesaCreateWindowBuffer( xmctx->xm_visual, draw );
1114         if (!drawBuffer) {
1115            /* Out of memory, or context/drawable depth mismatch */
1116            return False;
1117         }
1118      }
1119
1120      /* Find the XMesaBuffer which corresponds to the GLXDrawable 'read' */
1121      if (ctx == MakeCurrent_PrevContext
1122          && read == MakeCurrent_PrevReadable) {
1123         readBuffer = MakeCurrent_PrevReadBuffer;
1124      }
1125      else {
1126         readBuffer = XMesaFindBuffer( dpy, read );
1127      }
1128      if (!readBuffer) {
1129         /* drawable must be a new window! */
1130         readBuffer = XMesaCreateWindowBuffer( xmctx->xm_visual, read );
1131         if (!readBuffer) {
1132            /* Out of memory, or context/drawable depth mismatch */
1133            return False;
1134         }
1135      }
1136
1137      if (no_rast &&
1138          MakeCurrent_PrevContext == ctx &&
1139          MakeCurrent_PrevDrawable == draw &&
1140          MakeCurrent_PrevReadable == read &&
1141          MakeCurrent_PrevDrawBuffer == drawBuffer &&
1142          MakeCurrent_PrevReadBuffer == readBuffer)
1143         return True;
1144
1145      MakeCurrent_PrevContext = ctx;
1146      MakeCurrent_PrevDrawable = draw;
1147      MakeCurrent_PrevReadable = read;
1148      MakeCurrent_PrevDrawBuffer = drawBuffer;
1149      MakeCurrent_PrevReadBuffer = readBuffer;
1150
1151      /* Now make current! */
1152      if (XMesaMakeCurrent2(xmctx, drawBuffer, readBuffer)) {
1153         ctx->currentDpy = dpy;
1154         ctx->currentDrawable = draw;
1155         ctx->currentReadable = read;
1156         SetCurrentContext(ctx);
1157         return True;
1158      }
1159      else {
1160         return False;
1161      }
1162   }
1163   else if (!ctx && !draw && !read) {
1164      /* release current context w/out assigning new one. */
1165      XMesaMakeCurrent2( NULL, NULL, NULL );
1166      MakeCurrent_PrevContext = 0;
1167      MakeCurrent_PrevDrawable = 0;
1168      MakeCurrent_PrevReadable = 0;
1169      MakeCurrent_PrevDrawBuffer = 0;
1170      MakeCurrent_PrevReadBuffer = 0;
1171      SetCurrentContext(NULL);
1172      return True;
1173   }
1174   else {
1175      /* The args must either all be non-zero or all zero.
1176       * This is an error.
1177       */
1178      return False;
1179   }
1180}
1181
1182
1183PUBLIC Bool
1184glXMakeCurrent( Display *dpy, GLXDrawable drawable, GLXContext ctx )
1185{
1186   return glXMakeContextCurrent( dpy, drawable, drawable, ctx );
1187}
1188
1189
1190PUBLIC GLXContext
1191glXGetCurrentContext(void)
1192{
1193   return GetCurrentContext();
1194}
1195
1196
1197PUBLIC Display *
1198glXGetCurrentDisplay(void)
1199{
1200   GLXContext glxCtx = glXGetCurrentContext();
1201
1202   return glxCtx ? glxCtx->currentDpy : NULL;
1203}
1204
1205
1206PUBLIC Display *
1207glXGetCurrentDisplayEXT(void)
1208{
1209   return glXGetCurrentDisplay();
1210}
1211
1212
1213PUBLIC GLXDrawable
1214glXGetCurrentDrawable(void)
1215{
1216   GLXContext gc = glXGetCurrentContext();
1217   return gc ? gc->currentDrawable : 0;
1218}
1219
1220
1221PUBLIC GLXDrawable
1222glXGetCurrentReadDrawable(void)
1223{
1224   GLXContext gc = glXGetCurrentContext();
1225   return gc ? gc->currentReadable : 0;
1226}
1227
1228
1229PUBLIC GLXDrawable
1230glXGetCurrentReadDrawableSGI(void)
1231{
1232   return glXGetCurrentReadDrawable();
1233}
1234
1235
1236PUBLIC GLXPixmap
1237glXCreateGLXPixmap( Display *dpy, XVisualInfo *visinfo, Pixmap pixmap )
1238{
1239   XMesaVisual v;
1240   XMesaBuffer b;
1241
1242   v = find_glx_visual( dpy, visinfo );
1243   if (!v) {
1244      v = create_glx_visual( dpy, visinfo );
1245      if (!v) {
1246         /* unusable visual */
1247         return 0;
1248      }
1249   }
1250
1251   b = XMesaCreatePixmapBuffer( v, pixmap, 0 );
1252   if (!b) {
1253      return 0;
1254   }
1255   return b->drawable;
1256}
1257
1258
1259/*** GLX_MESA_pixmap_colormap ***/
1260
1261PUBLIC GLXPixmap
1262glXCreateGLXPixmapMESA( Display *dpy, XVisualInfo *visinfo,
1263                        Pixmap pixmap, Colormap cmap )
1264{
1265   XMesaVisual v;
1266   XMesaBuffer b;
1267
1268   v = find_glx_visual( dpy, visinfo );
1269   if (!v) {
1270      v = create_glx_visual( dpy, visinfo );
1271      if (!v) {
1272         /* unusable visual */
1273         return 0;
1274      }
1275   }
1276
1277   b = XMesaCreatePixmapBuffer( v, pixmap, cmap );
1278   if (!b) {
1279      return 0;
1280   }
1281   return b->drawable;
1282}
1283
1284
1285PUBLIC void
1286glXDestroyGLXPixmap( Display *dpy, GLXPixmap pixmap )
1287{
1288   XMesaBuffer b = XMesaFindBuffer(dpy, pixmap);
1289   if (b) {
1290      XMesaDestroyBuffer(b);
1291   }
1292   else if (_mesa_getenv("MESA_DEBUG")) {
1293      _mesa_warning(NULL, "Mesa: glXDestroyGLXPixmap: invalid pixmap\n");
1294   }
1295}
1296
1297
1298PUBLIC void
1299glXCopyContext( Display *dpy, GLXContext src, GLXContext dst,
1300                unsigned long mask )
1301{
1302   XMesaContext xm_src = src->xmesaContext;
1303   XMesaContext xm_dst = dst->xmesaContext;
1304   (void) dpy;
1305   if (MakeCurrent_PrevContext == src) {
1306      glFlush();
1307   }
1308   XMesaCopyContext(xm_src, xm_dst, mask);
1309}
1310
1311
1312PUBLIC Bool
1313glXQueryExtension( Display *dpy, int *errorBase, int *eventBase )
1314{
1315   int op, ev, err;
1316   /* Mesa's GLX isn't really an X extension but we try to act like one. */
1317   if (!XQueryExtension(dpy, GLX_EXTENSION_NAME, &op, &ev, &err))
1318      ev = err = 0;
1319   if (errorBase)
1320      *errorBase = err;
1321   if (eventBase)
1322      *eventBase = ev;
1323   return True; /* we're faking GLX so always return success */
1324}
1325
1326
1327PUBLIC void
1328glXDestroyContext( Display *dpy, GLXContext ctx )
1329{
1330   GLXContext glxCtx = ctx;
1331   (void) dpy;
1332   MakeCurrent_PrevContext = 0;
1333   MakeCurrent_PrevDrawable = 0;
1334   MakeCurrent_PrevReadable = 0;
1335   MakeCurrent_PrevDrawBuffer = 0;
1336   MakeCurrent_PrevReadBuffer = 0;
1337   XMesaDestroyContext( glxCtx->xmesaContext );
1338   XMesaGarbageCollect();
1339   free(glxCtx);
1340}
1341
1342
1343PUBLIC Bool
1344glXIsDirect( Display *dpy, GLXContext ctx )
1345{
1346   GLXContext glxCtx = ctx;
1347   (void) ctx;
1348   return glxCtx->isDirect;
1349}
1350
1351
1352
1353PUBLIC void
1354glXSwapBuffers( Display *dpy, GLXDrawable drawable )
1355{
1356   XMesaBuffer buffer = XMesaFindBuffer( dpy, drawable );
1357   static boolean firsttime = 1, no_rast = 0;
1358
1359   if (firsttime) {
1360      no_rast = getenv("SP_NO_RAST") != NULL;
1361      firsttime = 0;
1362   }
1363
1364   if (no_rast)
1365      return;
1366
1367   if (buffer) {
1368      XMesaSwapBuffers(buffer);
1369   }
1370   else if (_mesa_getenv("MESA_DEBUG")) {
1371      _mesa_warning(NULL, "glXSwapBuffers: invalid drawable 0x%x\n",
1372                    (int) drawable);
1373   }
1374}
1375
1376
1377
1378/*** GLX_MESA_copy_sub_buffer ***/
1379
1380PUBLIC void
1381glXCopySubBufferMESA(Display *dpy, GLXDrawable drawable,
1382                     int x, int y, int width, int height)
1383{
1384   XMesaBuffer buffer = XMesaFindBuffer( dpy, drawable );
1385   if (buffer) {
1386      XMesaCopySubBuffer(buffer, x, y, width, height);
1387   }
1388   else if (_mesa_getenv("MESA_DEBUG")) {
1389      _mesa_warning(NULL, "Mesa: glXCopySubBufferMESA: invalid drawable\n");
1390   }
1391}
1392
1393
1394PUBLIC Bool
1395glXQueryVersion( Display *dpy, int *maj, int *min )
1396{
1397   (void) dpy;
1398   /* Return GLX version, not Mesa version */
1399   assert(CLIENT_MAJOR_VERSION == SERVER_MAJOR_VERSION);
1400   *maj = CLIENT_MAJOR_VERSION;
1401   *min = MIN2( CLIENT_MINOR_VERSION, SERVER_MINOR_VERSION );
1402   return True;
1403}
1404
1405
1406/*
1407 * Query the GLX attributes of the given XVisualInfo.
1408 */
1409static int
1410get_config( XMesaVisual xmvis, int attrib, int *value, GLboolean fbconfig )
1411{
1412   ASSERT(xmvis);
1413   switch(attrib) {
1414      case GLX_USE_GL:
1415         if (fbconfig)
1416            return GLX_BAD_ATTRIBUTE;
1417         *value = (int) True;
1418	 return 0;
1419      case GLX_BUFFER_SIZE:
1420	 *value = xmvis->visinfo->depth;
1421	 return 0;
1422      case GLX_LEVEL:
1423	 *value = xmvis->mesa_visual.level;
1424	 return 0;
1425      case GLX_RGBA:
1426         if (fbconfig)
1427            return GLX_BAD_ATTRIBUTE;
1428	 if (xmvis->mesa_visual.rgbMode) {
1429	    *value = True;
1430	 }
1431	 else {
1432	    *value = False;
1433	 }
1434	 return 0;
1435      case GLX_DOUBLEBUFFER:
1436	 *value = (int) xmvis->mesa_visual.doubleBufferMode;
1437	 return 0;
1438      case GLX_STEREO:
1439	 *value = (int) xmvis->mesa_visual.stereoMode;
1440	 return 0;
1441      case GLX_AUX_BUFFERS:
1442	 *value = xmvis->mesa_visual.numAuxBuffers;
1443	 return 0;
1444      case GLX_RED_SIZE:
1445         *value = xmvis->mesa_visual.redBits;
1446	 return 0;
1447      case GLX_GREEN_SIZE:
1448         *value = xmvis->mesa_visual.greenBits;
1449	 return 0;
1450      case GLX_BLUE_SIZE:
1451         *value = xmvis->mesa_visual.blueBits;
1452	 return 0;
1453      case GLX_ALPHA_SIZE:
1454         *value = xmvis->mesa_visual.alphaBits;
1455	 return 0;
1456      case GLX_DEPTH_SIZE:
1457         *value = xmvis->mesa_visual.depthBits;
1458	 return 0;
1459      case GLX_STENCIL_SIZE:
1460	 *value = xmvis->mesa_visual.stencilBits;
1461	 return 0;
1462      case GLX_ACCUM_RED_SIZE:
1463	 *value = xmvis->mesa_visual.accumRedBits;
1464	 return 0;
1465      case GLX_ACCUM_GREEN_SIZE:
1466	 *value = xmvis->mesa_visual.accumGreenBits;
1467	 return 0;
1468      case GLX_ACCUM_BLUE_SIZE:
1469	 *value = xmvis->mesa_visual.accumBlueBits;
1470	 return 0;
1471      case GLX_ACCUM_ALPHA_SIZE:
1472         *value = xmvis->mesa_visual.accumAlphaBits;
1473	 return 0;
1474
1475      /*
1476       * GLX_EXT_visual_info extension
1477       */
1478      case GLX_X_VISUAL_TYPE_EXT:
1479         switch (xmvis->visinfo->CLASS) {
1480            case StaticGray:   *value = GLX_STATIC_GRAY_EXT;   return 0;
1481            case GrayScale:    *value = GLX_GRAY_SCALE_EXT;    return 0;
1482            case StaticColor:  *value = GLX_STATIC_GRAY_EXT;   return 0;
1483            case PseudoColor:  *value = GLX_PSEUDO_COLOR_EXT;  return 0;
1484            case TrueColor:    *value = GLX_TRUE_COLOR_EXT;    return 0;
1485            case DirectColor:  *value = GLX_DIRECT_COLOR_EXT;  return 0;
1486         }
1487         return 0;
1488      case GLX_TRANSPARENT_TYPE_EXT:
1489         /* normal planes */
1490         *value = GLX_NONE_EXT;
1491         return 0;
1492      case GLX_TRANSPARENT_INDEX_VALUE_EXT:
1493         /* undefined */
1494         return 0;
1495      case GLX_TRANSPARENT_RED_VALUE_EXT:
1496         /* undefined */
1497         return 0;
1498      case GLX_TRANSPARENT_GREEN_VALUE_EXT:
1499         /* undefined */
1500         return 0;
1501      case GLX_TRANSPARENT_BLUE_VALUE_EXT:
1502         /* undefined */
1503         return 0;
1504      case GLX_TRANSPARENT_ALPHA_VALUE_EXT:
1505         /* undefined */
1506         return 0;
1507
1508      /*
1509       * GLX_EXT_visual_info extension
1510       */
1511      case GLX_VISUAL_CAVEAT_EXT:
1512         /* test for zero, just in case */
1513         if (xmvis->mesa_visual.visualRating > 0)
1514            *value = xmvis->mesa_visual.visualRating;
1515         else
1516            *value = GLX_NONE_EXT;
1517         return 0;
1518
1519      /*
1520       * GLX_ARB_multisample
1521       */
1522      case GLX_SAMPLE_BUFFERS_ARB:
1523         *value = 0;
1524         return 0;
1525      case GLX_SAMPLES_ARB:
1526         *value = 0;
1527         return 0;
1528
1529      /*
1530       * For FBConfigs:
1531       */
1532      case GLX_SCREEN_EXT:
1533         if (!fbconfig)
1534            return GLX_BAD_ATTRIBUTE;
1535         *value = xmvis->visinfo->screen;
1536         break;
1537      case GLX_DRAWABLE_TYPE: /*SGIX too */
1538         if (!fbconfig)
1539            return GLX_BAD_ATTRIBUTE;
1540         *value = GLX_WINDOW_BIT | GLX_PIXMAP_BIT | GLX_PBUFFER_BIT;
1541         break;
1542      case GLX_RENDER_TYPE_SGIX:
1543         if (!fbconfig)
1544            return GLX_BAD_ATTRIBUTE;
1545         if (xmvis->mesa_visual.rgbMode)
1546            *value = GLX_RGBA_BIT;
1547         else
1548            *value = GLX_COLOR_INDEX_BIT;
1549         break;
1550      case GLX_X_RENDERABLE_SGIX:
1551         if (!fbconfig)
1552            return GLX_BAD_ATTRIBUTE;
1553         *value = True; /* XXX really? */
1554         break;
1555      case GLX_FBCONFIG_ID_SGIX:
1556         if (!fbconfig)
1557            return GLX_BAD_ATTRIBUTE;
1558         *value = xmvis->visinfo->visualid;
1559         break;
1560      case GLX_MAX_PBUFFER_WIDTH:
1561         if (!fbconfig)
1562            return GLX_BAD_ATTRIBUTE;
1563         /* XXX or MAX_WIDTH? */
1564         *value = DisplayWidth(xmvis->display, xmvis->visinfo->screen);
1565         break;
1566      case GLX_MAX_PBUFFER_HEIGHT:
1567         if (!fbconfig)
1568            return GLX_BAD_ATTRIBUTE;
1569         *value = DisplayHeight(xmvis->display, xmvis->visinfo->screen);
1570         break;
1571      case GLX_MAX_PBUFFER_PIXELS:
1572         if (!fbconfig)
1573            return GLX_BAD_ATTRIBUTE;
1574         *value = DisplayWidth(xmvis->display, xmvis->visinfo->screen) *
1575                  DisplayHeight(xmvis->display, xmvis->visinfo->screen);
1576         break;
1577      case GLX_VISUAL_ID:
1578         if (!fbconfig)
1579            return GLX_BAD_ATTRIBUTE;
1580         *value = xmvis->visinfo->visualid;
1581         break;
1582
1583#ifdef GLX_EXT_texture_from_pixmap
1584      case GLX_BIND_TO_TEXTURE_RGB_EXT:
1585         *value = True; /*XXX*/
1586         break;
1587      case GLX_BIND_TO_TEXTURE_RGBA_EXT:
1588         /* XXX review */
1589         *value = xmvis->mesa_visual.alphaBits > 0 ? True : False;
1590         break;
1591      case GLX_BIND_TO_MIPMAP_TEXTURE_EXT:
1592         *value = True; /*XXX*/
1593         break;
1594      case GLX_BIND_TO_TEXTURE_TARGETS_EXT:
1595         *value = (GLX_TEXTURE_1D_BIT_EXT |
1596                   GLX_TEXTURE_2D_BIT_EXT |
1597                   GLX_TEXTURE_RECTANGLE_BIT_EXT); /*XXX*/
1598         break;
1599      case GLX_Y_INVERTED_EXT:
1600         *value = True; /*XXX*/
1601         break;
1602#endif
1603
1604      default:
1605	 return GLX_BAD_ATTRIBUTE;
1606   }
1607   return Success;
1608}
1609
1610
1611PUBLIC int
1612glXGetConfig( Display *dpy, XVisualInfo *visinfo,
1613                   int attrib, int *value )
1614{
1615   XMesaVisual xmvis;
1616   int k;
1617   if (!dpy || !visinfo)
1618      return GLX_BAD_ATTRIBUTE;
1619
1620   xmvis = find_glx_visual( dpy, visinfo );
1621   if (!xmvis) {
1622      /* this visual wasn't obtained with glXChooseVisual */
1623      xmvis = create_glx_visual( dpy, visinfo );
1624      if (!xmvis) {
1625	 /* this visual can't be used for GL rendering */
1626	 if (attrib==GLX_USE_GL) {
1627	    *value = (int) False;
1628	    return 0;
1629	 }
1630	 else {
1631	    return GLX_BAD_VISUAL;
1632	 }
1633      }
1634   }
1635
1636   k = get_config(xmvis, attrib, value, GL_FALSE);
1637   return k;
1638}
1639
1640
1641PUBLIC void
1642glXWaitGL( void )
1643{
1644   XMesaContext xmesa = XMesaGetCurrentContext();
1645   XMesaFlush( xmesa );
1646}
1647
1648
1649
1650PUBLIC void
1651glXWaitX( void )
1652{
1653   XMesaContext xmesa = XMesaGetCurrentContext();
1654   XMesaFlush( xmesa );
1655}
1656
1657
1658static const char *
1659get_extensions( void )
1660{
1661   return EXTENSIONS;
1662}
1663
1664
1665
1666/* GLX 1.1 and later */
1667PUBLIC const char *
1668glXQueryExtensionsString( Display *dpy, int screen )
1669{
1670   (void) dpy;
1671   (void) screen;
1672   return get_extensions();
1673}
1674
1675
1676
1677/* GLX 1.1 and later */
1678PUBLIC const char *
1679glXQueryServerString( Display *dpy, int screen, int name )
1680{
1681   static char version[1000];
1682   sprintf(version, "%d.%d %s",
1683	   SERVER_MAJOR_VERSION, SERVER_MINOR_VERSION, xmesa_get_name());
1684
1685   (void) dpy;
1686   (void) screen;
1687
1688   switch (name) {
1689      case GLX_EXTENSIONS:
1690         return get_extensions();
1691      case GLX_VENDOR:
1692	 return VENDOR;
1693      case GLX_VERSION:
1694	 return version;
1695      default:
1696         return NULL;
1697   }
1698}
1699
1700
1701
1702/* GLX 1.1 and later */
1703PUBLIC const char *
1704glXGetClientString( Display *dpy, int name )
1705{
1706   static char version[1000];
1707   sprintf(version, "%d.%d %s", CLIENT_MAJOR_VERSION,
1708	   CLIENT_MINOR_VERSION, xmesa_get_name());
1709
1710   (void) dpy;
1711
1712   switch (name) {
1713      case GLX_EXTENSIONS:
1714         return get_extensions();
1715      case GLX_VENDOR:
1716	 return VENDOR;
1717      case GLX_VERSION:
1718	 return version;
1719      default:
1720         return NULL;
1721   }
1722}
1723
1724
1725
1726/*
1727 * GLX 1.3 and later
1728 */
1729
1730
1731PUBLIC int
1732glXGetFBConfigAttrib(Display *dpy, GLXFBConfig config,
1733                     int attribute, int *value)
1734{
1735   XMesaVisual v = (XMesaVisual) config;
1736   (void) dpy;
1737   (void) config;
1738
1739   if (!dpy || !config || !value)
1740      return -1;
1741
1742   return get_config(v, attribute, value, GL_TRUE);
1743}
1744
1745
1746PUBLIC GLXFBConfig *
1747glXGetFBConfigs( Display *dpy, int screen, int *nelements )
1748{
1749   XVisualInfo *visuals, visTemplate;
1750   const long visMask = VisualScreenMask;
1751   int i;
1752
1753   /* Get list of all X visuals */
1754   visTemplate.screen = screen;
1755   visuals = XGetVisualInfo(dpy, visMask, &visTemplate, nelements);
1756   if (*nelements > 0) {
1757      XMesaVisual *results;
1758      results = (XMesaVisual *) malloc(*nelements * sizeof(XMesaVisual));
1759      if (!results) {
1760         *nelements = 0;
1761         return NULL;
1762      }
1763      for (i = 0; i < *nelements; i++) {
1764         results[i] = create_glx_visual(dpy, visuals + i);
1765         if (!results[i]) {
1766            *nelements = i;
1767            break;
1768         }
1769      }
1770      return (GLXFBConfig *) results;
1771   }
1772   return NULL;
1773}
1774
1775
1776PUBLIC GLXFBConfig *
1777glXChooseFBConfig(Display *dpy, int screen,
1778                  const int *attribList, int *nitems)
1779{
1780   XMesaVisual xmvis;
1781
1782   if (!attribList || !attribList[0]) {
1783      /* return list of all configs (per GLX_SGIX_fbconfig spec) */
1784      return glXGetFBConfigs(dpy, screen, nitems);
1785   }
1786
1787   xmvis = choose_visual(dpy, screen, attribList, GL_TRUE);
1788   if (xmvis) {
1789      GLXFBConfig *config = (GLXFBConfig *) malloc(sizeof(XMesaVisual));
1790      if (!config) {
1791         *nitems = 0;
1792         return NULL;
1793      }
1794      *nitems = 1;
1795      config[0] = (GLXFBConfig) xmvis;
1796      return (GLXFBConfig *) config;
1797   }
1798   else {
1799      *nitems = 0;
1800      return NULL;
1801   }
1802}
1803
1804
1805PUBLIC XVisualInfo *
1806glXGetVisualFromFBConfig( Display *dpy, GLXFBConfig config )
1807{
1808   if (dpy && config) {
1809      XMesaVisual xmvis = (XMesaVisual) config;
1810#if 0
1811      return xmvis->vishandle;
1812#else
1813      /* create a new vishandle - the cached one may be stale */
1814      xmvis->vishandle = (XVisualInfo *) malloc(sizeof(XVisualInfo));
1815      if (xmvis->vishandle) {
1816         memcpy(xmvis->vishandle, xmvis->visinfo, sizeof(XVisualInfo));
1817      }
1818      return xmvis->vishandle;
1819#endif
1820   }
1821   else {
1822      return NULL;
1823   }
1824}
1825
1826
1827PUBLIC GLXWindow
1828glXCreateWindow(Display *dpy, GLXFBConfig config, Window win,
1829                const int *attribList)
1830{
1831   XMesaVisual xmvis = (XMesaVisual) config;
1832   XMesaBuffer xmbuf;
1833   if (!xmvis)
1834      return 0;
1835
1836   xmbuf = XMesaCreateWindowBuffer(xmvis, win);
1837   if (!xmbuf)
1838      return 0;
1839
1840   (void) dpy;
1841   (void) attribList;  /* Ignored in GLX 1.3 */
1842
1843   return win;  /* A hack for now */
1844}
1845
1846
1847PUBLIC void
1848glXDestroyWindow( Display *dpy, GLXWindow window )
1849{
1850   XMesaBuffer b = XMesaFindBuffer(dpy, (Drawable) window);
1851   if (b)
1852      XMesaDestroyBuffer(b);
1853   /* don't destroy X window */
1854}
1855
1856
1857/* XXX untested */
1858PUBLIC GLXPixmap
1859glXCreatePixmap(Display *dpy, GLXFBConfig config, Pixmap pixmap,
1860                const int *attribList)
1861{
1862   XMesaVisual v = (XMesaVisual) config;
1863   XMesaBuffer b;
1864   const int *attr;
1865   int target = 0, format = 0, mipmap = 0;
1866   int value;
1867
1868   if (!dpy || !config || !pixmap)
1869      return 0;
1870
1871   for (attr = attribList; attr && *attr; attr++) {
1872      switch (*attr) {
1873      case GLX_TEXTURE_FORMAT_EXT:
1874         attr++;
1875         switch (*attr) {
1876         case GLX_TEXTURE_FORMAT_NONE_EXT:
1877         case GLX_TEXTURE_FORMAT_RGB_EXT:
1878         case GLX_TEXTURE_FORMAT_RGBA_EXT:
1879            format = *attr;
1880            break;
1881         default:
1882            /* error */
1883            return 0;
1884         }
1885         break;
1886      case GLX_TEXTURE_TARGET_EXT:
1887         attr++;
1888         switch (*attr) {
1889         case GLX_TEXTURE_1D_EXT:
1890         case GLX_TEXTURE_2D_EXT:
1891         case GLX_TEXTURE_RECTANGLE_EXT:
1892            target = *attr;
1893            break;
1894         default:
1895            /* error */
1896            return 0;
1897         }
1898         break;
1899      case GLX_MIPMAP_TEXTURE_EXT:
1900         attr++;
1901         if (*attr)
1902            mipmap = 1;
1903         break;
1904      default:
1905         /* error */
1906         return 0;
1907      }
1908   }
1909
1910   if (format == GLX_TEXTURE_FORMAT_RGB_EXT) {
1911      if (get_config(v, GLX_BIND_TO_TEXTURE_RGB_EXT,
1912                     &value, GL_TRUE) != Success
1913          || !value) {
1914         return 0; /* error! */
1915      }
1916   }
1917   else if (format == GLX_TEXTURE_FORMAT_RGBA_EXT) {
1918      if (get_config(v, GLX_BIND_TO_TEXTURE_RGBA_EXT,
1919                     &value, GL_TRUE) != Success
1920          || !value) {
1921         return 0; /* error! */
1922      }
1923   }
1924   if (mipmap) {
1925      if (get_config(v, GLX_BIND_TO_MIPMAP_TEXTURE_EXT,
1926                     &value, GL_TRUE) != Success
1927          || !value) {
1928         return 0; /* error! */
1929      }
1930   }
1931   if (target == GLX_TEXTURE_1D_EXT) {
1932      if (get_config(v, GLX_BIND_TO_TEXTURE_TARGETS_EXT,
1933                     &value, GL_TRUE) != Success
1934          || (value & GLX_TEXTURE_1D_BIT_EXT) == 0) {
1935         return 0; /* error! */
1936      }
1937   }
1938   else if (target == GLX_TEXTURE_2D_EXT) {
1939      if (get_config(v, GLX_BIND_TO_TEXTURE_TARGETS_EXT,
1940                     &value, GL_TRUE) != Success
1941          || (value & GLX_TEXTURE_2D_BIT_EXT) == 0) {
1942         return 0; /* error! */
1943      }
1944   }
1945   if (target == GLX_TEXTURE_RECTANGLE_EXT) {
1946      if (get_config(v, GLX_BIND_TO_TEXTURE_TARGETS_EXT,
1947                     &value, GL_TRUE) != Success
1948          || (value & GLX_TEXTURE_RECTANGLE_BIT_EXT) == 0) {
1949         return 0; /* error! */
1950      }
1951   }
1952
1953   if (format || target || mipmap) {
1954      /* texture from pixmap */
1955      b = XMesaCreatePixmapTextureBuffer(v, pixmap, 0, format, target, mipmap);
1956   }
1957   else {
1958      b = XMesaCreatePixmapBuffer( v, pixmap, 0 );
1959   }
1960   if (!b) {
1961      return 0;
1962   }
1963
1964   return pixmap;
1965}
1966
1967
1968PUBLIC void
1969glXDestroyPixmap( Display *dpy, GLXPixmap pixmap )
1970{
1971   XMesaBuffer b = XMesaFindBuffer(dpy, (Drawable)pixmap);
1972   if (b)
1973      XMesaDestroyBuffer(b);
1974   /* don't destroy X pixmap */
1975}
1976
1977
1978PUBLIC GLXPbuffer
1979glXCreatePbuffer(Display *dpy, GLXFBConfig config, const int *attribList)
1980{
1981   XMesaVisual xmvis = (XMesaVisual) config;
1982   XMesaBuffer xmbuf;
1983   const int *attrib;
1984   int width = 0, height = 0;
1985   GLboolean useLargest = GL_FALSE, preserveContents = GL_FALSE;
1986
1987   (void) dpy;
1988
1989   for (attrib = attribList; *attrib; attrib++) {
1990      switch (*attrib) {
1991         case GLX_PBUFFER_WIDTH:
1992            attrib++;
1993            width = *attrib;
1994            break;
1995         case GLX_PBUFFER_HEIGHT:
1996            attrib++;
1997            height = *attrib;
1998            break;
1999         case GLX_PRESERVED_CONTENTS:
2000            attrib++;
2001            preserveContents = *attrib;
2002            break;
2003         case GLX_LARGEST_PBUFFER:
2004            attrib++;
2005            useLargest = *attrib;
2006            break;
2007         default:
2008            return 0;
2009      }
2010   }
2011
2012   if (width == 0 || height == 0)
2013      return 0;
2014
2015   if (width > MAX_WIDTH || height > MAX_HEIGHT) {
2016      /* If allocation would have failed and GLX_LARGEST_PBUFFER is set,
2017       * allocate the largest possible buffer.
2018       */
2019      if (useLargest) {
2020         width = MAX_WIDTH;
2021         height = MAX_HEIGHT;
2022      }
2023   }
2024
2025   xmbuf = XMesaCreatePBuffer( xmvis, 0, width, height);
2026   /* A GLXPbuffer handle must be an X Drawable because that's what
2027    * glXMakeCurrent takes.
2028    */
2029   if (xmbuf) {
2030      xmbuf->largestPbuffer = useLargest;
2031      xmbuf->preservedContents = preserveContents;
2032      return (GLXPbuffer) xmbuf->drawable;
2033   }
2034   else {
2035      return 0;
2036   }
2037}
2038
2039
2040PUBLIC void
2041glXDestroyPbuffer( Display *dpy, GLXPbuffer pbuf )
2042{
2043   XMesaBuffer b = XMesaFindBuffer(dpy, pbuf);
2044   if (b) {
2045      XMesaDestroyBuffer(b);
2046   }
2047}
2048
2049
2050PUBLIC void
2051glXQueryDrawable(Display *dpy, GLXDrawable draw, int attribute,
2052                 unsigned int *value)
2053{
2054   GLuint width, height;
2055   XMesaBuffer xmbuf = XMesaFindBuffer(dpy, draw);
2056   if (!xmbuf)
2057      return;
2058
2059   /* make sure buffer's dimensions are up to date */
2060   xmesa_get_window_size(dpy, xmbuf, &width, &height);
2061
2062   switch (attribute) {
2063      case GLX_WIDTH:
2064         *value = width;
2065         break;
2066      case GLX_HEIGHT:
2067         *value = height;
2068         break;
2069      case GLX_PRESERVED_CONTENTS:
2070         *value = xmbuf->preservedContents;
2071         break;
2072      case GLX_LARGEST_PBUFFER:
2073         *value = xmbuf->largestPbuffer;
2074         break;
2075      case GLX_FBCONFIG_ID:
2076         *value = xmbuf->xm_visual->visinfo->visualid;
2077         return;
2078#ifdef GLX_EXT_texture_from_pixmap
2079      case GLX_TEXTURE_FORMAT_EXT:
2080         *value = xmbuf->TextureFormat;
2081         break;
2082      case GLX_TEXTURE_TARGET_EXT:
2083         *value = xmbuf->TextureTarget;
2084         break;
2085      case GLX_MIPMAP_TEXTURE_EXT:
2086         *value = xmbuf->TextureMipmap;
2087         break;
2088#endif
2089
2090      default:
2091         return; /* raise BadValue error */
2092   }
2093}
2094
2095
2096PUBLIC GLXContext
2097glXCreateNewContext( Display *dpy, GLXFBConfig config,
2098                     int renderType, GLXContext shareCtx, Bool direct )
2099{
2100   XMesaVisual xmvis = (XMesaVisual) config;
2101
2102   if (!dpy || !config ||
2103       (renderType != GLX_RGBA_TYPE && renderType != GLX_COLOR_INDEX_TYPE))
2104      return 0;
2105
2106   return create_context(dpy, xmvis,
2107                         shareCtx ? shareCtx->xmesaContext : NULL,
2108                         direct);
2109}
2110
2111
2112PUBLIC int
2113glXQueryContext( Display *dpy, GLXContext ctx, int attribute, int *value )
2114{
2115   GLXContext glxCtx = ctx;
2116   XMesaContext xmctx = glxCtx->xmesaContext;
2117
2118   (void) dpy;
2119   (void) ctx;
2120
2121   switch (attribute) {
2122   case GLX_FBCONFIG_ID:
2123      *value = xmctx->xm_visual->visinfo->visualid;
2124      break;
2125   case GLX_RENDER_TYPE:
2126      if (xmctx->xm_visual->mesa_visual.rgbMode)
2127         *value = GLX_RGBA_TYPE;
2128      else
2129         *value = GLX_COLOR_INDEX_TYPE;
2130      break;
2131   case GLX_SCREEN:
2132      *value = 0;
2133      return Success;
2134   default:
2135      return GLX_BAD_ATTRIBUTE;
2136   }
2137   return 0;
2138}
2139
2140
2141PUBLIC void
2142glXSelectEvent( Display *dpy, GLXDrawable drawable, unsigned long mask )
2143{
2144   XMesaBuffer xmbuf = XMesaFindBuffer(dpy, drawable);
2145   if (xmbuf)
2146      xmbuf->selectedEvents = mask;
2147}
2148
2149
2150PUBLIC void
2151glXGetSelectedEvent(Display *dpy, GLXDrawable drawable, unsigned long *mask)
2152{
2153   XMesaBuffer xmbuf = XMesaFindBuffer(dpy, drawable);
2154   if (xmbuf)
2155      *mask = xmbuf->selectedEvents;
2156   else
2157      *mask = 0;
2158}
2159
2160
2161
2162/*** GLX_SGI_swap_control ***/
2163
2164PUBLIC int
2165glXSwapIntervalSGI(int interval)
2166{
2167   (void) interval;
2168   return 0;
2169}
2170
2171
2172
2173/*** GLX_SGI_video_sync ***/
2174
2175static unsigned int FrameCounter = 0;
2176
2177PUBLIC int
2178glXGetVideoSyncSGI(unsigned int *count)
2179{
2180   /* this is a bogus implementation */
2181   *count = FrameCounter++;
2182   return 0;
2183}
2184
2185PUBLIC int
2186glXWaitVideoSyncSGI(int divisor, int remainder, unsigned int *count)
2187{
2188   if (divisor <= 0 || remainder < 0)
2189      return GLX_BAD_VALUE;
2190   /* this is a bogus implementation */
2191   FrameCounter++;
2192   while (FrameCounter % divisor != remainder)
2193      FrameCounter++;
2194   *count = FrameCounter;
2195   return 0;
2196}
2197
2198
2199
2200/*** GLX_SGI_make_current_read ***/
2201
2202PUBLIC Bool
2203glXMakeCurrentReadSGI(Display *dpy, GLXDrawable draw, GLXDrawable read,
2204                      GLXContext ctx)
2205{
2206   return glXMakeContextCurrent( dpy, draw, read, ctx );
2207}
2208
2209/* not used
2210static GLXDrawable
2211glXGetCurrentReadDrawableSGI(void)
2212{
2213   return 0;
2214}
2215*/
2216
2217
2218/*** GLX_SGIX_video_source ***/
2219#if defined(_VL_H)
2220
2221PUBLIC GLXVideoSourceSGIX
2222glXCreateGLXVideoSourceSGIX(Display *dpy, int screen, VLServer server,
2223                            VLPath path, int nodeClass, VLNode drainNode)
2224{
2225   (void) dpy;
2226   (void) screen;
2227   (void) server;
2228   (void) path;
2229   (void) nodeClass;
2230   (void) drainNode;
2231   return 0;
2232}
2233
2234PUBLIC void
2235glXDestroyGLXVideoSourceSGIX(Display *dpy, GLXVideoSourceSGIX src)
2236{
2237   (void) dpy;
2238   (void) src;
2239}
2240
2241#endif
2242
2243
2244/*** GLX_EXT_import_context ***/
2245
2246PUBLIC void
2247glXFreeContextEXT(Display *dpy, GLXContext context)
2248{
2249   (void) dpy;
2250   (void) context;
2251}
2252
2253PUBLIC GLXContextID
2254glXGetContextIDEXT(const GLXContext context)
2255{
2256   (void) context;
2257   return 0;
2258}
2259
2260PUBLIC GLXContext
2261glXImportContextEXT(Display *dpy, GLXContextID contextID)
2262{
2263   (void) dpy;
2264   (void) contextID;
2265   return 0;
2266}
2267
2268PUBLIC int
2269glXQueryContextInfoEXT(Display *dpy, GLXContext context, int attribute,
2270                       int *value)
2271{
2272   (void) dpy;
2273   (void) context;
2274   (void) attribute;
2275   (void) value;
2276   return 0;
2277}
2278
2279
2280
2281/*** GLX_SGIX_fbconfig ***/
2282
2283PUBLIC int
2284glXGetFBConfigAttribSGIX(Display *dpy, GLXFBConfigSGIX config,
2285                         int attribute, int *value)
2286{
2287   return glXGetFBConfigAttrib(dpy, config, attribute, value);
2288}
2289
2290PUBLIC GLXFBConfigSGIX *
2291glXChooseFBConfigSGIX(Display *dpy, int screen, int *attrib_list,
2292                      int *nelements)
2293{
2294   return (GLXFBConfig *) glXChooseFBConfig(dpy, screen,
2295                                            attrib_list, nelements);
2296}
2297
2298
2299PUBLIC GLXPixmap
2300glXCreateGLXPixmapWithConfigSGIX(Display *dpy, GLXFBConfigSGIX config,
2301                                 Pixmap pixmap)
2302{
2303   XMesaVisual xmvis = (XMesaVisual) config;
2304   XMesaBuffer xmbuf = XMesaCreatePixmapBuffer(xmvis, pixmap, 0);
2305   return xmbuf->drawable; /* need to return an X ID */
2306}
2307
2308
2309PUBLIC GLXContext
2310glXCreateContextWithConfigSGIX(Display *dpy, GLXFBConfigSGIX config,
2311                               int renderType, GLXContext shareCtx,
2312                               Bool direct)
2313{
2314   XMesaVisual xmvis = (XMesaVisual) config;
2315
2316   if (!dpy || !config ||
2317       (renderType != GLX_RGBA_TYPE && renderType != GLX_COLOR_INDEX_TYPE))
2318      return 0;
2319
2320   return create_context(dpy, xmvis,
2321                         shareCtx ? shareCtx->xmesaContext : NULL,
2322                         direct);
2323}
2324
2325
2326PUBLIC XVisualInfo *
2327glXGetVisualFromFBConfigSGIX(Display *dpy, GLXFBConfigSGIX config)
2328{
2329   return glXGetVisualFromFBConfig(dpy, config);
2330}
2331
2332
2333PUBLIC GLXFBConfigSGIX
2334glXGetFBConfigFromVisualSGIX(Display *dpy, XVisualInfo *vis)
2335{
2336   XMesaVisual xmvis = find_glx_visual(dpy, vis);
2337   if (!xmvis) {
2338      /* This visual wasn't found with glXChooseVisual() */
2339      xmvis = create_glx_visual(dpy, vis);
2340   }
2341
2342   return (GLXFBConfigSGIX) xmvis;
2343}
2344
2345
2346
2347/*** GLX_SGIX_pbuffer ***/
2348
2349PUBLIC GLXPbufferSGIX
2350glXCreateGLXPbufferSGIX(Display *dpy, GLXFBConfigSGIX config,
2351                        unsigned int width, unsigned int height,
2352                        int *attribList)
2353{
2354   XMesaVisual xmvis = (XMesaVisual) config;
2355   XMesaBuffer xmbuf;
2356   const int *attrib;
2357   GLboolean useLargest = GL_FALSE, preserveContents = GL_FALSE;
2358
2359   (void) dpy;
2360
2361   for (attrib = attribList; attrib && *attrib; attrib++) {
2362      switch (*attrib) {
2363         case GLX_PRESERVED_CONTENTS_SGIX:
2364            attrib++;
2365            preserveContents = *attrib; /* ignored */
2366            break;
2367         case GLX_LARGEST_PBUFFER_SGIX:
2368            attrib++;
2369            useLargest = *attrib; /* ignored */
2370            break;
2371         default:
2372            return 0;
2373      }
2374   }
2375
2376   /* not used at this time */
2377   (void) useLargest;
2378   (void) preserveContents;
2379
2380   xmbuf = XMesaCreatePBuffer( xmvis, 0, width, height);
2381   /* A GLXPbuffer handle must be an X Drawable because that's what
2382    * glXMakeCurrent takes.
2383    */
2384   return (GLXPbuffer) xmbuf->drawable;
2385}
2386
2387
2388PUBLIC void
2389glXDestroyGLXPbufferSGIX(Display *dpy, GLXPbufferSGIX pbuf)
2390{
2391   XMesaBuffer xmbuf = XMesaFindBuffer(dpy, pbuf);
2392   if (xmbuf) {
2393      XMesaDestroyBuffer(xmbuf);
2394   }
2395}
2396
2397
2398PUBLIC int
2399glXQueryGLXPbufferSGIX(Display *dpy, GLXPbufferSGIX pbuf, int attribute,
2400                       unsigned int *value)
2401{
2402   const XMesaBuffer xmbuf = XMesaFindBuffer(dpy, pbuf);
2403
2404   if (!xmbuf) {
2405      /* Generate GLXBadPbufferSGIX for bad pbuffer */
2406      return 0;
2407   }
2408
2409   switch (attribute) {
2410      case GLX_PRESERVED_CONTENTS_SGIX:
2411         *value = True;
2412         break;
2413      case GLX_LARGEST_PBUFFER_SGIX:
2414         *value = xmesa_buffer_width(xmbuf) * xmesa_buffer_height(xmbuf);
2415         break;
2416      case GLX_WIDTH_SGIX:
2417         *value = xmesa_buffer_width(xmbuf);
2418         break;
2419      case GLX_HEIGHT_SGIX:
2420         *value = xmesa_buffer_height(xmbuf);
2421         break;
2422      case GLX_EVENT_MASK_SGIX:
2423         *value = 0;  /* XXX might be wrong */
2424         break;
2425      default:
2426         *value = 0;
2427   }
2428   return 0;
2429}
2430
2431
2432PUBLIC void
2433glXSelectEventSGIX(Display *dpy, GLXDrawable drawable, unsigned long mask)
2434{
2435   XMesaBuffer xmbuf = XMesaFindBuffer(dpy, drawable);
2436   if (xmbuf) {
2437      /* Note: we'll never generate clobber events */
2438      xmbuf->selectedEvents = mask;
2439   }
2440}
2441
2442
2443PUBLIC void
2444glXGetSelectedEventSGIX(Display *dpy, GLXDrawable drawable,
2445                        unsigned long *mask)
2446{
2447   XMesaBuffer xmbuf = XMesaFindBuffer(dpy, drawable);
2448   if (xmbuf) {
2449      *mask = xmbuf->selectedEvents;
2450   }
2451   else {
2452      *mask = 0;
2453   }
2454}
2455
2456
2457
2458/*** GLX_SGI_cushion ***/
2459
2460PUBLIC void
2461glXCushionSGI(Display *dpy, Window win, float cushion)
2462{
2463   (void) dpy;
2464   (void) win;
2465   (void) cushion;
2466}
2467
2468
2469
2470/*** GLX_SGIX_video_resize ***/
2471
2472PUBLIC int
2473glXBindChannelToWindowSGIX(Display *dpy, int screen, int channel,
2474                           Window window)
2475{
2476   (void) dpy;
2477   (void) screen;
2478   (void) channel;
2479   (void) window;
2480   return 0;
2481}
2482
2483PUBLIC int
2484glXChannelRectSGIX(Display *dpy, int screen, int channel,
2485                   int x, int y, int w, int h)
2486{
2487   (void) dpy;
2488   (void) screen;
2489   (void) channel;
2490   (void) x;
2491   (void) y;
2492   (void) w;
2493   (void) h;
2494   return 0;
2495}
2496
2497PUBLIC int
2498glXQueryChannelRectSGIX(Display *dpy, int screen, int channel,
2499                        int *x, int *y, int *w, int *h)
2500{
2501   (void) dpy;
2502   (void) screen;
2503   (void) channel;
2504   (void) x;
2505   (void) y;
2506   (void) w;
2507   (void) h;
2508   return 0;
2509}
2510
2511PUBLIC int
2512glXQueryChannelDeltasSGIX(Display *dpy, int screen, int channel,
2513                          int *dx, int *dy, int *dw, int *dh)
2514{
2515   (void) dpy;
2516   (void) screen;
2517   (void) channel;
2518   (void) dx;
2519   (void) dy;
2520   (void) dw;
2521   (void) dh;
2522   return 0;
2523}
2524
2525PUBLIC int
2526glXChannelRectSyncSGIX(Display *dpy, int screen, int channel, GLenum synctype)
2527{
2528   (void) dpy;
2529   (void) screen;
2530   (void) channel;
2531   (void) synctype;
2532   return 0;
2533}
2534
2535
2536
2537/*** GLX_SGIX_dmbuffer **/
2538
2539#if defined(_DM_BUFFER_H_)
2540PUBLIC Bool
2541glXAssociateDMPbufferSGIX(Display *dpy, GLXPbufferSGIX pbuffer,
2542                          DMparams *params, DMbuffer dmbuffer)
2543{
2544   (void) dpy;
2545   (void) pbuffer;
2546   (void) params;
2547   (void) dmbuffer;
2548   return False;
2549}
2550#endif
2551
2552
2553/*** GLX_SGIX_swap_group ***/
2554
2555PUBLIC void
2556glXJoinSwapGroupSGIX(Display *dpy, GLXDrawable drawable, GLXDrawable member)
2557{
2558   (void) dpy;
2559   (void) drawable;
2560   (void) member;
2561}
2562
2563
2564
2565/*** GLX_SGIX_swap_barrier ***/
2566
2567PUBLIC void
2568glXBindSwapBarrierSGIX(Display *dpy, GLXDrawable drawable, int barrier)
2569{
2570   (void) dpy;
2571   (void) drawable;
2572   (void) barrier;
2573}
2574
2575PUBLIC Bool
2576glXQueryMaxSwapBarriersSGIX(Display *dpy, int screen, int *max)
2577{
2578   (void) dpy;
2579   (void) screen;
2580   (void) max;
2581   return False;
2582}
2583
2584
2585
2586/*** GLX_SUN_get_transparent_index ***/
2587
2588PUBLIC Status
2589glXGetTransparentIndexSUN(Display *dpy, Window overlay, Window underlay,
2590                          long *pTransparent)
2591{
2592   (void) dpy;
2593   (void) overlay;
2594   (void) underlay;
2595   (void) pTransparent;
2596   return 0;
2597}
2598
2599
2600
2601/*** GLX_MESA_release_buffers ***/
2602
2603/*
2604 * Release the depth, stencil, accum buffers attached to a GLXDrawable
2605 * (a window or pixmap) prior to destroying the GLXDrawable.
2606 */
2607PUBLIC Bool
2608glXReleaseBuffersMESA( Display *dpy, GLXDrawable d )
2609{
2610   XMesaBuffer b = XMesaFindBuffer(dpy, d);
2611   if (b) {
2612      XMesaDestroyBuffer(b);
2613      return True;
2614   }
2615   return False;
2616}
2617
2618/*** GLX_EXT_texture_from_pixmap ***/
2619
2620PUBLIC void
2621glXBindTexImageEXT(Display *dpy, GLXDrawable drawable, int buffer,
2622                        const int *attrib_list)
2623{
2624   XMesaBuffer b = XMesaFindBuffer(dpy, drawable);
2625   if (b)
2626      XMesaBindTexImage(dpy, b, buffer, attrib_list);
2627}
2628
2629PUBLIC void
2630glXReleaseTexImageEXT(Display *dpy, GLXDrawable drawable, int buffer)
2631{
2632   XMesaBuffer b = XMesaFindBuffer(dpy, drawable);
2633   if (b)
2634      XMesaReleaseTexImage(dpy, b, buffer);
2635}
2636