glxext.c revision c491e585e43d48a2aeec96ccc4008da6c443fb42 
1/*
2 * SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
3 * Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved.
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice including the dates of first publication and
13 * either this permission notice or a reference to
14 * http://oss.sgi.com/projects/FreeB/
15 * shall be included in all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * SILICON GRAPHICS, INC. BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
21 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
22 * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
23 * SOFTWARE.
24 *
25 * Except as contained in this notice, the name of Silicon Graphics, Inc.
26 * shall not be used in advertising or otherwise to promote the sale, use or
27 * other dealings in this Software without prior written authorization from
28 * Silicon Graphics, Inc.
29 */
30
31/**
32 * \file glxext.c
33 * GLX protocol interface boot-strap code.
34 *
35 * Direct rendering support added by Precision Insight, Inc.
36 *
37 * \author Kevin E. Martin <kevin@precisioninsight.com>
38 */
39
40#include <assert.h>
41#include "glxclient.h"
42#include <X11/extensions/Xext.h>
43#include <X11/extensions/extutil.h>
44#include <X11/extensions/dri2proto.h>
45#ifdef GLX_USE_APPLEGL
46#include "apple_glx.h"
47#include "apple_visual.h"
48#endif
49#include "glxextensions.h"
50
51#ifdef USE_XCB
52#include <X11/Xlib-xcb.h>
53#include <xcb/xcb.h>
54#include <xcb/glx.h>
55#endif
56
57
58#ifdef DEBUG
59void __glXDumpDrawBuffer(struct glx_context * ctx);
60#endif
61
62/*
63** You can set this cell to 1 to force the gl drawing stuff to be
64** one command per packet
65*/
66_X_HIDDEN int __glXDebug = 0;
67
68/* Extension required boiler plate */
69
70static const char __glXExtensionName[] = GLX_EXTENSION_NAME;
71  static struct glx_display *glx_displays;
72
73static /* const */ char *error_list[] = {
74   "GLXBadContext",
75   "GLXBadContextState",
76   "GLXBadDrawable",
77   "GLXBadPixmap",
78   "GLXBadContextTag",
79   "GLXBadCurrentWindow",
80   "GLXBadRenderRequest",
81   "GLXBadLargeRequest",
82   "GLXUnsupportedPrivateRequest",
83   "GLXBadFBConfig",
84   "GLXBadPbuffer",
85   "GLXBadCurrentDrawable",
86   "GLXBadWindow",
87};
88
89#ifdef GLX_USE_APPLEGL
90static char *__glXErrorString(Display *dpy, int code, XExtCodes *codes,
91                              char *buf, int n);
92#endif
93
94static
95XEXT_GENERATE_ERROR_STRING(__glXErrorString, __glXExtensionName,
96                           __GLX_NUMBER_ERRORS, error_list)
97
98/*
99 * GLX events are a bit funky.  We don't stuff the X event code into
100 * our user exposed (via XNextEvent) structure.  Instead we use the GLX
101 * private event code namespace (and hope it doesn't conflict).  Clients
102 * have to know that bit 15 in the event type field means they're getting
103 * a GLX event, and then handle the various sub-event types there, rather
104 * than simply checking the event code and handling it directly.
105 */
106
107static Bool
108__glXWireToEvent(Display *dpy, XEvent *event, xEvent *wire)
109{
110     struct glx_display *glx_dpy = __glXInitialize(dpy);
111
112   if (glx_dpy == NULL)
113      return False;
114
115   switch ((wire->u.u.type & 0x7f) - glx_dpy->codes->first_event) {
116   case GLX_PbufferClobber:
117   {
118      GLXPbufferClobberEvent *aevent = (GLXPbufferClobberEvent *)event;
119      xGLXPbufferClobberEvent *awire = (xGLXPbufferClobberEvent *)wire;
120      aevent->event_type = awire->type;
121      aevent->serial = awire->sequenceNumber;
122      aevent->event_type = awire->event_type;
123      aevent->draw_type = awire->draw_type;
124      aevent->drawable = awire->drawable;
125      aevent->buffer_mask = awire->buffer_mask;
126      aevent->aux_buffer = awire->aux_buffer;
127      aevent->x = awire->x;
128      aevent->y = awire->y;
129      aevent->width = awire->width;
130      aevent->height = awire->height;
131      aevent->count = awire->count;
132      return True;
133   }
134   /* No easy symbol to test for this, as GLX_BufferSwapComplete is
135    * defined in the local glx.h header, but the
136    * xGLXBufferSwapComplete typedef is only available in new versions
137    * of the external glxproto.h header, which doesn't have any
138    * testable versioning define.
139    *
140    * I'll use the related DRI2 define, in the hope that we won't
141    * receive these events unless we know how to ask for them:
142    */
143#ifdef X_DRI2SwapBuffers
144   case GLX_BufferSwapComplete:
145   {
146      GLXBufferSwapComplete *aevent = (GLXBufferSwapComplete *)event;
147      xGLXBufferSwapComplete *awire = (xGLXBufferSwapComplete *)wire;
148      aevent->event_type = awire->event_type;
149      aevent->drawable = awire->drawable;
150      aevent->ust = ((CARD64)awire->ust_hi << 32) | awire->ust_lo;
151      aevent->msc = ((CARD64)awire->msc_hi << 32) | awire->msc_lo;
152      aevent->sbc = ((CARD64)awire->sbc_hi << 32) | awire->sbc_lo;
153      return True;
154   }
155#endif
156   default:
157      /* client doesn't support server event */
158      break;
159   }
160
161   return False;
162}
163
164/* We don't actually support this.  It doesn't make sense for clients to
165 * send each other GLX events.
166 */
167static Status
168__glXEventToWire(Display *dpy, XEvent *event, xEvent *wire)
169{
170     struct glx_display *glx_dpy = __glXInitialize(dpy);
171
172   if (glx_dpy == NULL)
173      return False;
174
175   switch (event->type) {
176   case GLX_DAMAGED:
177      break;
178   case GLX_SAVED:
179      break;
180   case GLX_EXCHANGE_COMPLETE_INTEL:
181      break;
182   case GLX_COPY_COMPLETE_INTEL:
183      break;
184   case GLX_FLIP_COMPLETE_INTEL:
185      break;
186   default:
187      /* client doesn't support server event */
188      break;
189   }
190
191   return Success;
192}
193
194/************************************************************************/
195/*
196** Free the per screen configs data as well as the array of
197** __glXScreenConfigs.
198*/
199static void
200  FreeScreenConfigs(struct glx_display * priv)
201{
202   struct glx_screen *psc;
203   GLint i, screens;
204
205   /* Free screen configuration information */
206   screens = ScreenCount(priv->dpy);
207   for (i = 0; i < screens; i++) {
208      psc = priv->screens[i];
209      if (psc->configs) {
210	 glx_config_destroy_list(psc->configs);
211         if (psc->effectiveGLXexts)
212            Xfree(psc->effectiveGLXexts);
213         psc->configs = NULL;   /* NOTE: just for paranoia */
214      }
215      if (psc->visuals) {
216	 glx_config_destroy_list(psc->visuals);
217	 psc->visuals = NULL;   /* NOTE: just for paranoia */
218      }
219      Xfree((char *) psc->serverGLXexts);
220
221#if defined(GLX_DIRECT_RENDERING) && !defined(GLX_USE_APPLEGL)
222      if (psc->driScreen) {
223         psc->driScreen->destroyScreen(psc);
224      } else {
225	 Xfree(psc);
226      }
227#else
228      Xfree(psc);
229#endif
230   }
231   XFree((char *) priv->screens);
232   priv->screens = NULL;
233}
234
235/*
236** Release the private memory referred to in a display private
237** structure.  The caller will free the extension structure.
238*/
239static int
240__glXCloseDisplay(Display * dpy, XExtCodes * codes)
241{
242     struct glx_display *priv, **prev;
243     struct glx_context *gc;
244
245   _XLockMutex(_Xglobal_lock);
246   prev = &glx_displays;
247   for (priv = glx_displays; priv; prev = &priv->next, priv = priv->next) {
248      if (priv->dpy == dpy) {
249	 (*prev)->next = priv->next;
250	 break;
251      }
252   }
253   _XUnlockMutex(_Xglobal_lock);
254
255   gc = __glXGetCurrentContext();
256   if (dpy == gc->currentDpy) {
257      gc->vtable->destroy(gc);
258      __glXSetCurrentContextNull();
259   }
260
261   FreeScreenConfigs(priv);
262   if (priv->serverGLXvendor)
263      Xfree((char *) priv->serverGLXvendor);
264   if (priv->serverGLXversion)
265      Xfree((char *) priv->serverGLXversion);
266
267   __glxHashDestroy(priv->drawHash);
268
269#if defined(GLX_DIRECT_RENDERING) && !defined(GLX_USE_APPLEGL)
270   /* Free the direct rendering per display data */
271   if (priv->driswDisplay)
272      (*priv->driswDisplay->destroyDisplay) (priv->driswDisplay);
273   priv->driswDisplay = NULL;
274
275   if (priv->driDisplay)
276      (*priv->driDisplay->destroyDisplay) (priv->driDisplay);
277   priv->driDisplay = NULL;
278
279   if (priv->dri2Display)
280      (*priv->dri2Display->destroyDisplay) (priv->dri2Display);
281   priv->dri2Display = NULL;
282#endif
283
284   Xfree((char *) priv);
285
286   return 1;
287}
288
289/*
290** Query the version of the GLX extension.  This procedure works even if
291** the client extension is not completely set up.
292*/
293static Bool
294QueryVersion(Display * dpy, int opcode, int *major, int *minor)
295{
296#ifdef USE_XCB
297   xcb_connection_t *c = XGetXCBConnection(dpy);
298   xcb_glx_query_version_reply_t *reply = xcb_glx_query_version_reply(c,
299                                                                      xcb_glx_query_version
300                                                                      (c,
301                                                                       GLX_MAJOR_VERSION,
302                                                                       GLX_MINOR_VERSION),
303                                                                      NULL);
304
305   if (reply->major_version != GLX_MAJOR_VERSION) {
306      free(reply);
307      return GL_FALSE;
308   }
309   *major = reply->major_version;
310   *minor = min(reply->minor_version, GLX_MINOR_VERSION);
311   free(reply);
312   return GL_TRUE;
313#else
314   xGLXQueryVersionReq *req;
315   xGLXQueryVersionReply reply;
316
317   /* Send the glXQueryVersion request */
318   LockDisplay(dpy);
319   GetReq(GLXQueryVersion, req);
320   req->reqType = opcode;
321   req->glxCode = X_GLXQueryVersion;
322   req->majorVersion = GLX_MAJOR_VERSION;
323   req->minorVersion = GLX_MINOR_VERSION;
324   _XReply(dpy, (xReply *) & reply, 0, False);
325   UnlockDisplay(dpy);
326   SyncHandle();
327
328   if (reply.majorVersion != GLX_MAJOR_VERSION) {
329      /*
330       ** The server does not support the same major release as this
331       ** client.
332       */
333      return GL_FALSE;
334   }
335   *major = reply.majorVersion;
336   *minor = min(reply.minorVersion, GLX_MINOR_VERSION);
337   return GL_TRUE;
338#endif /* USE_XCB */
339}
340
341/*
342 * We don't want to enable this GLX_OML_swap_method in glxext.h,
343 * because we can't support it.  The X server writes it out though,
344 * so we should handle it somehow, to avoid false warnings.
345 */
346enum {
347    IGNORE_GLX_SWAP_METHOD_OML = 0x8060
348};
349
350
351static GLint
352convert_from_x_visual_type(int visualType)
353{
354   static const int glx_visual_types[] = {
355      GLX_STATIC_GRAY, GLX_GRAY_SCALE,
356      GLX_STATIC_COLOR, GLX_PSEUDO_COLOR,
357      GLX_TRUE_COLOR, GLX_DIRECT_COLOR
358   };
359
360   if (visualType < ARRAY_SIZE(glx_visual_types))
361      return glx_visual_types[visualType];
362
363   return GLX_NONE;
364}
365
366/*
367 * getVisualConfigs uses the !tagged_only path.
368 * getFBConfigs uses the tagged_only path.
369 */
370_X_HIDDEN void
371__glXInitializeVisualConfigFromTags(struct glx_config * config, int count,
372                                    const INT32 * bp, Bool tagged_only,
373                                    Bool fbconfig_style_tags)
374{
375   int i;
376
377   if (!tagged_only) {
378      /* Copy in the first set of properties */
379      config->visualID = *bp++;
380
381      config->visualType = convert_from_x_visual_type(*bp++);
382
383      config->rgbMode = *bp++;
384
385      config->redBits = *bp++;
386      config->greenBits = *bp++;
387      config->blueBits = *bp++;
388      config->alphaBits = *bp++;
389      config->accumRedBits = *bp++;
390      config->accumGreenBits = *bp++;
391      config->accumBlueBits = *bp++;
392      config->accumAlphaBits = *bp++;
393
394      config->doubleBufferMode = *bp++;
395      config->stereoMode = *bp++;
396
397      config->rgbBits = *bp++;
398      config->depthBits = *bp++;
399      config->stencilBits = *bp++;
400      config->numAuxBuffers = *bp++;
401      config->level = *bp++;
402
403#ifdef GLX_USE_APPLEGL
404       /* AppleSGLX supports pixmap and pbuffers with all config. */
405       config->drawableType = GLX_WINDOW_BIT | GLX_PIXMAP_BIT | GLX_PBUFFER_BIT;
406       /* Unfortunately this can create an ABI compatibility problem. */
407       count -= 18;
408#else
409      count -= __GLX_MIN_CONFIG_PROPS;
410#endif
411   }
412
413   /*
414    ** Additional properties may be in a list at the end
415    ** of the reply.  They are in pairs of property type
416    ** and property value.
417    */
418
419#define FETCH_OR_SET(tag) \
420    config-> tag = ( fbconfig_style_tags ) ? *bp++ : 1
421
422   for (i = 0; i < count; i += 2) {
423      long int tag = *bp++;
424
425      switch (tag) {
426      case GLX_RGBA:
427         FETCH_OR_SET(rgbMode);
428         break;
429      case GLX_BUFFER_SIZE:
430         config->rgbBits = *bp++;
431         break;
432      case GLX_LEVEL:
433         config->level = *bp++;
434         break;
435      case GLX_DOUBLEBUFFER:
436         FETCH_OR_SET(doubleBufferMode);
437         break;
438      case GLX_STEREO:
439         FETCH_OR_SET(stereoMode);
440         break;
441      case GLX_AUX_BUFFERS:
442         config->numAuxBuffers = *bp++;
443         break;
444      case GLX_RED_SIZE:
445         config->redBits = *bp++;
446         break;
447      case GLX_GREEN_SIZE:
448         config->greenBits = *bp++;
449         break;
450      case GLX_BLUE_SIZE:
451         config->blueBits = *bp++;
452         break;
453      case GLX_ALPHA_SIZE:
454         config->alphaBits = *bp++;
455         break;
456      case GLX_DEPTH_SIZE:
457         config->depthBits = *bp++;
458         break;
459      case GLX_STENCIL_SIZE:
460         config->stencilBits = *bp++;
461         break;
462      case GLX_ACCUM_RED_SIZE:
463         config->accumRedBits = *bp++;
464         break;
465      case GLX_ACCUM_GREEN_SIZE:
466         config->accumGreenBits = *bp++;
467         break;
468      case GLX_ACCUM_BLUE_SIZE:
469         config->accumBlueBits = *bp++;
470         break;
471      case GLX_ACCUM_ALPHA_SIZE:
472         config->accumAlphaBits = *bp++;
473         break;
474      case GLX_VISUAL_CAVEAT_EXT:
475         config->visualRating = *bp++;
476         break;
477      case GLX_X_VISUAL_TYPE:
478         config->visualType = *bp++;
479         break;
480      case GLX_TRANSPARENT_TYPE:
481         config->transparentPixel = *bp++;
482         break;
483      case GLX_TRANSPARENT_INDEX_VALUE:
484         config->transparentIndex = *bp++;
485         break;
486      case GLX_TRANSPARENT_RED_VALUE:
487         config->transparentRed = *bp++;
488         break;
489      case GLX_TRANSPARENT_GREEN_VALUE:
490         config->transparentGreen = *bp++;
491         break;
492      case GLX_TRANSPARENT_BLUE_VALUE:
493         config->transparentBlue = *bp++;
494         break;
495      case GLX_TRANSPARENT_ALPHA_VALUE:
496         config->transparentAlpha = *bp++;
497         break;
498      case GLX_VISUAL_ID:
499         config->visualID = *bp++;
500         break;
501      case GLX_DRAWABLE_TYPE:
502         config->drawableType = *bp++;
503#ifdef GLX_USE_APPLEGL
504         /* AppleSGLX supports pixmap and pbuffers with all config. */
505         config->drawableType |= GLX_WINDOW_BIT | GLX_PIXMAP_BIT | GLX_PBUFFER_BIT;
506#endif
507         break;
508      case GLX_RENDER_TYPE:
509         config->renderType = *bp++;
510         break;
511      case GLX_X_RENDERABLE:
512         config->xRenderable = *bp++;
513         break;
514      case GLX_FBCONFIG_ID:
515         config->fbconfigID = *bp++;
516         break;
517      case GLX_MAX_PBUFFER_WIDTH:
518         config->maxPbufferWidth = *bp++;
519         break;
520      case GLX_MAX_PBUFFER_HEIGHT:
521         config->maxPbufferHeight = *bp++;
522         break;
523      case GLX_MAX_PBUFFER_PIXELS:
524         config->maxPbufferPixels = *bp++;
525         break;
526#ifndef GLX_USE_APPLEGL
527      case GLX_OPTIMAL_PBUFFER_WIDTH_SGIX:
528         config->optimalPbufferWidth = *bp++;
529         break;
530      case GLX_OPTIMAL_PBUFFER_HEIGHT_SGIX:
531         config->optimalPbufferHeight = *bp++;
532         break;
533      case GLX_VISUAL_SELECT_GROUP_SGIX:
534         config->visualSelectGroup = *bp++;
535         break;
536      case GLX_SWAP_METHOD_OML:
537         config->swapMethod = *bp++;
538         break;
539#endif
540      case GLX_SAMPLE_BUFFERS_SGIS:
541         config->sampleBuffers = *bp++;
542         break;
543      case GLX_SAMPLES_SGIS:
544         config->samples = *bp++;
545         break;
546#ifdef GLX_USE_APPLEGL
547      case IGNORE_GLX_SWAP_METHOD_OML:
548         /* We ignore this tag.  See the comment above this function. */
549         ++bp;
550         break;
551#else
552      case GLX_BIND_TO_TEXTURE_RGB_EXT:
553         config->bindToTextureRgb = *bp++;
554         break;
555      case GLX_BIND_TO_TEXTURE_RGBA_EXT:
556         config->bindToTextureRgba = *bp++;
557         break;
558      case GLX_BIND_TO_MIPMAP_TEXTURE_EXT:
559         config->bindToMipmapTexture = *bp++;
560         break;
561      case GLX_BIND_TO_TEXTURE_TARGETS_EXT:
562         config->bindToTextureTargets = *bp++;
563         break;
564      case GLX_Y_INVERTED_EXT:
565         config->yInverted = *bp++;
566         break;
567#endif
568      case GLX_USE_GL:
569         if (fbconfig_style_tags)
570            bp++;
571         break;
572      case None:
573         i = count;
574         break;
575      default:
576         if(getenv("LIBGL_DIAGNOSTIC")) {
577             long int tagvalue = *bp++;
578             fprintf(stderr, "WARNING: unknown GLX tag from server: "
579                     "tag 0x%lx value 0x%lx\n", tag, tagvalue);
580         } else {
581             /* Ignore the unrecognized tag's value */
582             bp++;
583         }
584         break;
585      }
586   }
587
588   config->renderType =
589      (config->rgbMode) ? GLX_RGBA_BIT : GLX_COLOR_INDEX_BIT;
590}
591
592static struct glx_config *
593createConfigsFromProperties(Display * dpy, int nvisuals, int nprops,
594                            int screen, GLboolean tagged_only)
595{
596   INT32 buf[__GLX_TOTAL_CONFIG], *props;
597   unsigned prop_size;
598   struct glx_config *modes, *m;
599   int i;
600
601   if (nprops == 0)
602      return NULL;
603
604   /* FIXME: Is the __GLX_MIN_CONFIG_PROPS test correct for FBconfigs? */
605
606   /* Check number of properties */
607   if (nprops < __GLX_MIN_CONFIG_PROPS || nprops > __GLX_MAX_CONFIG_PROPS)
608      return NULL;
609
610   /* Allocate memory for our config structure */
611   modes = glx_config_create_list(nvisuals);
612   if (!modes)
613      return NULL;
614
615   prop_size = nprops * __GLX_SIZE_INT32;
616   if (prop_size <= sizeof(buf))
617      props = buf;
618   else
619      props = Xmalloc(prop_size);
620
621   /* Read each config structure and convert it into our format */
622   m = modes;
623   for (i = 0; i < nvisuals; i++) {
624      _XRead(dpy, (char *) props, prop_size);
625#ifdef GLX_USE_APPLEGL
626       /* Older X servers don't send this so we default it here. */
627      m->drawableType = GLX_WINDOW_BIT;
628#else
629      /*
630       * The XQuartz 2.3.2.1 X server doesn't set this properly, so
631       * set the proper bits here.
632       * AppleSGLX supports windows, pixmaps, and pbuffers with all config.
633       */
634      m->drawableType = GLX_WINDOW_BIT | GLX_PIXMAP_BIT | GLX_PBUFFER_BIT;
635#endif
636       __glXInitializeVisualConfigFromTags(m, nprops, props,
637                                          tagged_only, GL_TRUE);
638      m->screen = screen;
639      m = m->next;
640   }
641
642   if (props != buf)
643      Xfree(props);
644
645   return modes;
646}
647
648static GLboolean
649getVisualConfigs(struct glx_screen *psc,
650		  struct glx_display *priv, int screen)
651{
652   xGLXGetVisualConfigsReq *req;
653   xGLXGetVisualConfigsReply reply;
654   Display *dpy = priv->dpy;
655
656   LockDisplay(dpy);
657
658   psc->visuals = NULL;
659   GetReq(GLXGetVisualConfigs, req);
660   req->reqType = priv->majorOpcode;
661   req->glxCode = X_GLXGetVisualConfigs;
662   req->screen = screen;
663
664   if (!_XReply(dpy, (xReply *) & reply, 0, False))
665      goto out;
666
667   psc->visuals = createConfigsFromProperties(dpy,
668                                              reply.numVisuals,
669                                              reply.numProps,
670                                              screen, GL_FALSE);
671
672 out:
673   UnlockDisplay(dpy);
674   return psc->visuals != NULL;
675}
676
677static GLboolean
678 getFBConfigs(struct glx_screen *psc, struct glx_display *priv, int screen)
679{
680   xGLXGetFBConfigsReq *fb_req;
681   xGLXGetFBConfigsSGIXReq *sgi_req;
682   xGLXVendorPrivateWithReplyReq *vpreq;
683   xGLXGetFBConfigsReply reply;
684   Display *dpy = priv->dpy;
685
686   psc->serverGLXexts =
687      __glXQueryServerString(dpy, priv->majorOpcode, screen, GLX_EXTENSIONS);
688
689   LockDisplay(dpy);
690
691   psc->configs = NULL;
692   if (atof(priv->serverGLXversion) >= 1.3) {
693      GetReq(GLXGetFBConfigs, fb_req);
694      fb_req->reqType = priv->majorOpcode;
695      fb_req->glxCode = X_GLXGetFBConfigs;
696      fb_req->screen = screen;
697   }
698   else if (strstr(psc->serverGLXexts, "GLX_SGIX_fbconfig") != NULL) {
699      GetReqExtra(GLXVendorPrivateWithReply,
700                  sz_xGLXGetFBConfigsSGIXReq +
701                  sz_xGLXVendorPrivateWithReplyReq, vpreq);
702      sgi_req = (xGLXGetFBConfigsSGIXReq *) vpreq;
703      sgi_req->reqType = priv->majorOpcode;
704      sgi_req->glxCode = X_GLXVendorPrivateWithReply;
705      sgi_req->vendorCode = X_GLXvop_GetFBConfigsSGIX;
706      sgi_req->screen = screen;
707   }
708   else
709      goto out;
710
711   if (!_XReply(dpy, (xReply *) & reply, 0, False))
712      goto out;
713
714   psc->configs = createConfigsFromProperties(dpy,
715                                              reply.numFBConfigs,
716                                              reply.numAttribs * 2,
717                                              screen, GL_TRUE);
718
719 out:
720   UnlockDisplay(dpy);
721   return psc->configs != NULL;
722}
723
724_X_HIDDEN Bool
725glx_screen_init(struct glx_screen *psc,
726		 int screen, struct glx_display * priv)
727{
728   /* Initialize per screen dynamic client GLX extensions */
729   psc->ext_list_first_time = GL_TRUE;
730   psc->scr = screen;
731   psc->dpy = priv->dpy;
732   psc->display = priv;
733
734   getVisualConfigs(psc, priv, screen);
735   getFBConfigs(psc, priv, screen);
736
737   return GL_TRUE;
738}
739
740/*
741** Allocate the memory for the per screen configs for each screen.
742** If that works then fetch the per screen configs data.
743*/
744static Bool
745AllocAndFetchScreenConfigs(Display * dpy, struct glx_display * priv)
746{
747   struct glx_screen *psc;
748   GLint i, screens;
749
750   /*
751    ** First allocate memory for the array of per screen configs.
752    */
753   screens = ScreenCount(dpy);
754   priv->screens = Xmalloc(screens * sizeof *priv->screens);
755   if (!priv->screens)
756      return GL_FALSE;
757
758   priv->serverGLXversion =
759      __glXQueryServerString(dpy, priv->majorOpcode, 0, GLX_VERSION);
760   if (priv->serverGLXversion == NULL) {
761      FreeScreenConfigs(priv);
762      return GL_FALSE;
763   }
764
765   for (i = 0; i < screens; i++, psc++) {
766      psc = NULL;
767#if defined(GLX_DIRECT_RENDERING) && !defined(GLX_USE_APPLEGL)
768      if (priv->dri2Display)
769	 psc = (*priv->dri2Display->createScreen) (i, priv);
770      if (psc == NULL && priv->driDisplay)
771	 psc = (*priv->driDisplay->createScreen) (i, priv);
772      if (psc == NULL && priv->driswDisplay)
773	 psc = (*priv->driswDisplay->createScreen) (i, priv);
774#endif
775      if (psc == NULL)
776	 psc = indirect_create_screen(i, priv);
777      priv->screens[i] = psc;
778   }
779   SyncHandle();
780   return GL_TRUE;
781}
782
783/*
784** Initialize the client side extension code.
785*/
786 _X_HIDDEN struct glx_display *
787__glXInitialize(Display * dpy)
788{
789    struct glx_display *dpyPriv;
790#if defined(GLX_DIRECT_RENDERING) && !defined(GLX_USE_APPLEGL)
791   Bool glx_direct, glx_accel;
792#endif
793   int i;
794
795   _XLockMutex(_Xglobal_lock);
796
797   for (dpyPriv = glx_displays; dpyPriv; dpyPriv = dpyPriv->next) {
798      if (dpyPriv->dpy == dpy) {
799	 _XUnlockMutex(_Xglobal_lock);
800	 return dpyPriv;
801      }
802   }
803
804   dpyPriv = Xcalloc(1, sizeof *dpyPriv);
805   if (!dpyPriv)
806      return NULL;
807
808   dpyPriv->codes = XInitExtension(dpy, __glXExtensionName);
809   if (!dpyPriv->codes) {
810      Xfree(dpyPriv);
811      _XUnlockMutex(_Xglobal_lock);
812      return NULL;
813   }
814
815   dpyPriv->dpy = dpy;
816   dpyPriv->majorOpcode = dpyPriv->codes->major_opcode;
817   dpyPriv->serverGLXvendor = 0x0;
818   dpyPriv->serverGLXversion = 0x0;
819
820   /* See if the versions are compatible */
821   if (!QueryVersion(dpy, dpyPriv->majorOpcode,
822		     &dpyPriv->majorVersion, &dpyPriv->minorVersion)) {
823      Xfree(dpyPriv);
824      _XUnlockMutex(_Xglobal_lock);
825      return NULL;
826   }
827
828   for (i = 0; i < __GLX_NUMBER_EVENTS; i++) {
829      XESetWireToEvent(dpy, dpyPriv->codes->first_event + i, __glXWireToEvent);
830      XESetEventToWire(dpy, dpyPriv->codes->first_event + i, __glXEventToWire);
831   }
832
833   XESetCloseDisplay(dpy, dpyPriv->codes->extension, __glXCloseDisplay);
834   XESetErrorString (dpy, dpyPriv->codes->extension,__glXErrorString);
835
836#if defined(GLX_DIRECT_RENDERING) && !defined(GLX_USE_APPLEGL)
837   glx_direct = (getenv("LIBGL_ALWAYS_INDIRECT") == NULL);
838   glx_accel = (getenv("LIBGL_ALWAYS_SOFTWARE") == NULL);
839
840   dpyPriv->drawHash = __glxHashCreate();
841
842   /*
843    ** Initialize the direct rendering per display data and functions.
844    ** Note: This _must_ be done before calling any other DRI routines
845    ** (e.g., those called in AllocAndFetchScreenConfigs).
846    */
847   if (glx_direct && glx_accel) {
848      dpyPriv->dri2Display = dri2CreateDisplay(dpy);
849      dpyPriv->driDisplay = driCreateDisplay(dpy);
850   }
851   if (glx_direct)
852      dpyPriv->driswDisplay = driswCreateDisplay(dpy);
853#endif
854
855#ifdef GLX_USE_APPLEGL
856   if (apple_init_glx(dpy)) {
857      Xfree(dpyPriv);
858      return NULL;
859   }
860#endif
861   if (!AllocAndFetchScreenConfigs(dpy, dpyPriv)) {
862      Xfree(dpyPriv);
863      return NULL;
864   }
865
866   if (dpyPriv->majorVersion == 1 && dpyPriv->minorVersion >= 1)
867      __glXClientInfo(dpy, dpyPriv->majorOpcode);
868
869   dpyPriv->next = glx_displays;
870   glx_displays = dpyPriv;
871
872    _XUnlockMutex(_Xglobal_lock);
873
874   return dpyPriv;
875}
876
877/*
878** Setup for sending a GLX command on dpy.  Make sure the extension is
879** initialized.  Try to avoid calling __glXInitialize as its kinda slow.
880*/
881_X_HIDDEN CARD8
882__glXSetupForCommand(Display * dpy)
883{
884    struct glx_context *gc;
885    struct glx_display *priv;
886
887   /* If this thread has a current context, flush its rendering commands */
888   gc = __glXGetCurrentContext();
889   if (gc->currentDpy) {
890      /* Flush rendering buffer of the current context, if any */
891      (void) __glXFlushRenderBuffer(gc, gc->pc);
892
893      if (gc->currentDpy == dpy) {
894         /* Use opcode from gc because its right */
895         return gc->majorOpcode;
896      }
897      else {
898         /*
899          ** Have to get info about argument dpy because it might be to
900          ** a different server
901          */
902      }
903   }
904
905   /* Forced to lookup extension via the slow initialize route */
906   priv = __glXInitialize(dpy);
907   if (!priv) {
908      return 0;
909   }
910   return priv->majorOpcode;
911}
912
913/**
914 * Flush the drawing command transport buffer.
915 *
916 * \param ctx  Context whose transport buffer is to be flushed.
917 * \param pc   Pointer to first unused buffer location.
918 *
919 * \todo
920 * Modify this function to use \c ctx->pc instead of the explicit
921 * \c pc parameter.
922 */
923_X_HIDDEN GLubyte *
924__glXFlushRenderBuffer(struct glx_context * ctx, GLubyte * pc)
925{
926   Display *const dpy = ctx->currentDpy;
927#ifdef USE_XCB
928   xcb_connection_t *c = XGetXCBConnection(dpy);
929#else
930   xGLXRenderReq *req;
931#endif /* USE_XCB */
932   const GLint size = pc - ctx->buf;
933
934   if ((dpy != NULL) && (size > 0)) {
935#ifdef USE_XCB
936      xcb_glx_render(c, ctx->currentContextTag, size,
937                     (const uint8_t *) ctx->buf);
938#else
939      /* Send the entire buffer as an X request */
940      LockDisplay(dpy);
941      GetReq(GLXRender, req);
942      req->reqType = ctx->majorOpcode;
943      req->glxCode = X_GLXRender;
944      req->contextTag = ctx->currentContextTag;
945      req->length += (size + 3) >> 2;
946      _XSend(dpy, (char *) ctx->buf, size);
947      UnlockDisplay(dpy);
948      SyncHandle();
949#endif
950   }
951
952   /* Reset pointer and return it */
953   ctx->pc = ctx->buf;
954   return ctx->pc;
955}
956
957
958/**
959 * Send a portion of a GLXRenderLarge command to the server.  The advantage of
960 * this function over \c __glXSendLargeCommand is that callers can use the
961 * data buffer in the GLX context and may be able to avoid allocating an
962 * extra buffer.  The disadvantage is the clients will have to do more
963 * GLX protocol work (i.e., calculating \c totalRequests, etc.).
964 *
965 * \sa __glXSendLargeCommand
966 *
967 * \param gc             GLX context
968 * \param requestNumber  Which part of the whole command is this?  The first
969 *                       request is 1.
970 * \param totalRequests  How many requests will there be?
971 * \param data           Command data.
972 * \param dataLen        Size, in bytes, of the command data.
973 */
974_X_HIDDEN void
975__glXSendLargeChunk(struct glx_context * gc, GLint requestNumber,
976                    GLint totalRequests, const GLvoid * data, GLint dataLen)
977{
978   Display *dpy = gc->currentDpy;
979#ifdef USE_XCB
980   xcb_connection_t *c = XGetXCBConnection(dpy);
981   xcb_glx_render_large(c, gc->currentContextTag, requestNumber,
982                        totalRequests, dataLen, data);
983#else
984   xGLXRenderLargeReq *req;
985
986   if (requestNumber == 1) {
987      LockDisplay(dpy);
988   }
989
990   GetReq(GLXRenderLarge, req);
991   req->reqType = gc->majorOpcode;
992   req->glxCode = X_GLXRenderLarge;
993   req->contextTag = gc->currentContextTag;
994   req->length += (dataLen + 3) >> 2;
995   req->requestNumber = requestNumber;
996   req->requestTotal = totalRequests;
997   req->dataBytes = dataLen;
998   Data(dpy, data, dataLen);
999
1000   if (requestNumber == totalRequests) {
1001      UnlockDisplay(dpy);
1002      SyncHandle();
1003   }
1004#endif /* USE_XCB */
1005}
1006
1007
1008/**
1009 * Send a command that is too large for the GLXRender protocol request.
1010 *
1011 * Send a large command, one that is too large for some reason to
1012 * send using the GLXRender protocol request.  One reason to send
1013 * a large command is to avoid copying the data.
1014 *
1015 * \param ctx        GLX context
1016 * \param header     Header data.
1017 * \param headerLen  Size, in bytes, of the header data.  It is assumed that
1018 *                   the header data will always be small enough to fit in
1019 *                   a single X protocol packet.
1020 * \param data       Command data.
1021 * \param dataLen    Size, in bytes, of the command data.
1022 */
1023_X_HIDDEN void
1024__glXSendLargeCommand(struct glx_context * ctx,
1025                      const GLvoid * header, GLint headerLen,
1026                      const GLvoid * data, GLint dataLen)
1027{
1028   GLint maxSize;
1029   GLint totalRequests, requestNumber;
1030
1031   /*
1032    ** Calculate the maximum amount of data can be stuffed into a single
1033    ** packet.  sz_xGLXRenderReq is added because bufSize is the maximum
1034    ** packet size minus sz_xGLXRenderReq.
1035    */
1036   maxSize = (ctx->bufSize + sz_xGLXRenderReq) - sz_xGLXRenderLargeReq;
1037   totalRequests = 1 + (dataLen / maxSize);
1038   if (dataLen % maxSize)
1039      totalRequests++;
1040
1041   /*
1042    ** Send all of the command, except the large array, as one request.
1043    */
1044   assert(headerLen <= maxSize);
1045   __glXSendLargeChunk(ctx, 1, totalRequests, header, headerLen);
1046
1047   /*
1048    ** Send enough requests until the whole array is sent.
1049    */
1050   for (requestNumber = 2; requestNumber <= (totalRequests - 1);
1051        requestNumber++) {
1052      __glXSendLargeChunk(ctx, requestNumber, totalRequests, data, maxSize);
1053      data = (const GLvoid *) (((const GLubyte *) data) + maxSize);
1054      dataLen -= maxSize;
1055      assert(dataLen > 0);
1056   }
1057
1058   assert(dataLen <= maxSize);
1059   __glXSendLargeChunk(ctx, requestNumber, totalRequests, data, dataLen);
1060}
1061
1062/************************************************************************/
1063
1064#ifdef DEBUG
1065_X_HIDDEN void
1066__glXDumpDrawBuffer(struct glx_context * ctx)
1067{
1068   GLubyte *p = ctx->buf;
1069   GLubyte *end = ctx->pc;
1070   GLushort opcode, length;
1071
1072   while (p < end) {
1073      /* Fetch opcode */
1074      opcode = *((GLushort *) p);
1075      length = *((GLushort *) (p + 2));
1076      printf("%2x: %5d: ", opcode, length);
1077      length -= 4;
1078      p += 4;
1079      while (length > 0) {
1080         printf("%08x ", *((unsigned *) p));
1081         p += 4;
1082         length -= 4;
1083      }
1084      printf("\n");
1085   }
1086}
1087#endif
1088