xm_api.c revision 439842e434c87ea1775e828820d11e8194982bcc 
1/*
2 * Mesa 3-D graphics library
3 * Version:  7.1
4 *
5 * Copyright (C) 1999-2007  Brian Paul   All Rights Reserved.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation
10 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11 * and/or sell copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be included
15 * 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 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
21 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
23 */
24
25/**
26 * \file xm_api.c
27 *
28 * All the XMesa* API functions.
29 *
30 *
31 * NOTES:
32 *
33 * The window coordinate system origin (0,0) is in the lower-left corner
34 * of the window.  X11's window coordinate origin is in the upper-left
35 * corner of the window.  Therefore, most drawing functions in this
36 * file have to flip Y coordinates.
37 *
38 * Define USE_XSHM in the Makefile with -DUSE_XSHM if you want to compile
39 * in support for the MIT Shared Memory extension.  If enabled, when you
40 * use an Ximage for the back buffer in double buffered mode, the "swap"
41 * operation will be faster.  You must also link with -lXext.
42 *
43 * Byte swapping:  If the Mesa host and the X display use a different
44 * byte order then there's some trickiness to be aware of when using
45 * XImages.  The byte ordering used for the XImage is that of the X
46 * display, not the Mesa host.
47 * The color-to-pixel encoding for True/DirectColor must be done
48 * according to the display's visual red_mask, green_mask, and blue_mask.
49 * If XPutPixel is used to put a pixel into an XImage then XPutPixel will
50 * do byte swapping if needed.  If one wants to directly "poke" the pixel
51 * into the XImage's buffer then the pixel must be byte swapped first.  In
52 * Mesa, when byte swapping is needed we use the PF_TRUECOLOR pixel format
53 * and use XPutPixel everywhere except in the implementation of
54 * glClear(GL_COLOR_BUFFER_BIT).  We want this function to be fast so
55 * instead of using XPutPixel we "poke" our values after byte-swapping
56 * the clear pixel value if needed.
57 *
58 */
59
60#ifdef __CYGWIN__
61#undef WIN32
62#undef __WIN32__
63#endif
64
65#include "glxheader.h"
66#include "xmesaP.h"
67#include "main/context.h"
68#include "main/extensions.h"
69#include "main/framebuffer.h"
70#include "main/imports.h"
71#include "main/macros.h"
72#include "main/renderbuffer.h"
73#include "main/teximage.h"
74#include "glapi/glthread.h"
75#include "swrast/swrast.h"
76#include "swrast/s_renderbuffer.h"
77#include "swrast_setup/swrast_setup.h"
78#include "vbo/vbo.h"
79#include "tnl/tnl.h"
80#include "tnl/t_context.h"
81#include "tnl/t_pipeline.h"
82#include "drivers/common/driverfuncs.h"
83#include "drivers/common/meta.h"
84
85/**
86 * Global X driver lock
87 */
88_glthread_Mutex _xmesa_lock;
89
90
91
92/**********************************************************************/
93/*****                     X Utility Functions                    *****/
94/**********************************************************************/
95
96
97/**
98 * Return the host's byte order as LSBFirst or MSBFirst ala X.
99 */
100static int host_byte_order( void )
101{
102   int i = 1;
103   char *cptr = (char *) &i;
104   return (*cptr==1) ? LSBFirst : MSBFirst;
105}
106
107
108/**
109 * Check if the X Shared Memory extension is available.
110 * Return:  0 = not available
111 *          1 = shared XImage support available
112 *          2 = shared Pixmap support available also
113 */
114static int check_for_xshm( XMesaDisplay *display )
115{
116#if defined(USE_XSHM)
117   int ignore;
118
119   if (XQueryExtension( display, "MIT-SHM", &ignore, &ignore, &ignore )) {
120      /* Note: we're no longer calling XShmQueryVersion() here.  It seems
121       * to be flakey (triggers a spurious X protocol error when we close
122       * one display connection and start using a new one.  XShm has been
123       * around a long time and hasn't changed so if MIT_SHM is supported
124       * we assume we're good to go.
125       */
126      return 2;
127   }
128   else {
129      return 0;
130   }
131#else
132   /* No  XSHM support */
133   return 0;
134#endif
135}
136
137
138/**
139 * Apply gamma correction to an intensity value in [0..max].  Return the
140 * new intensity value.
141 */
142static GLint
143gamma_adjust( GLfloat gamma, GLint value, GLint max )
144{
145   if (gamma == 1.0) {
146      return value;
147   }
148   else {
149      double x = (double) value / (double) max;
150      return IROUND_POS((GLfloat) max * pow(x, 1.0F/gamma));
151   }
152}
153
154
155
156/**
157 * Return the true number of bits per pixel for XImages.
158 * For example, if we request a 24-bit deep visual we may actually need/get
159 * 32bpp XImages.  This function returns the appropriate bpp.
160 * Input:  dpy - the X display
161 *         visinfo - desribes the visual to be used for XImages
162 * Return:  true number of bits per pixel for XImages
163 */
164static int
165bits_per_pixel( XMesaVisual xmv )
166{
167   XMesaDisplay *dpy = xmv->display;
168   XMesaVisualInfo visinfo = xmv->visinfo;
169   XMesaImage *img;
170   int bitsPerPixel;
171   /* Create a temporary XImage */
172   img = XCreateImage( dpy, visinfo->visual, visinfo->depth,
173		       ZPixmap, 0,           /*format, offset*/
174		       (char*) MALLOC(8),    /*data*/
175		       1, 1,                 /*width, height*/
176		       32,                   /*bitmap_pad*/
177		       0                     /*bytes_per_line*/
178                     );
179   assert(img);
180   /* grab the bits/pixel value */
181   bitsPerPixel = img->bits_per_pixel;
182   /* free the XImage */
183   free( img->data );
184   img->data = NULL;
185   XMesaDestroyImage( img );
186   return bitsPerPixel;
187}
188
189
190
191/*
192 * Determine if a given X window ID is valid (window exists).
193 * Do this by calling XGetWindowAttributes() for the window and
194 * checking if we catch an X error.
195 * Input:  dpy - the display
196 *         win - the window to check for existance
197 * Return:  GL_TRUE - window exists
198 *          GL_FALSE - window doesn't exist
199 */
200static GLboolean WindowExistsFlag;
201
202static int window_exists_err_handler( XMesaDisplay* dpy, XErrorEvent* xerr )
203{
204   (void) dpy;
205   if (xerr->error_code == BadWindow) {
206      WindowExistsFlag = GL_FALSE;
207   }
208   return 0;
209}
210
211static GLboolean window_exists( XMesaDisplay *dpy, Window win )
212{
213   XWindowAttributes wa;
214   int (*old_handler)( XMesaDisplay*, XErrorEvent* );
215   WindowExistsFlag = GL_TRUE;
216   old_handler = XSetErrorHandler(window_exists_err_handler);
217   XGetWindowAttributes( dpy, win, &wa ); /* dummy request */
218   XSetErrorHandler(old_handler);
219   return WindowExistsFlag;
220}
221
222static Status
223get_drawable_size( XMesaDisplay *dpy, Drawable d, GLuint *width, GLuint *height )
224{
225   Window root;
226   Status stat;
227   int xpos, ypos;
228   unsigned int w, h, bw, depth;
229   stat = XGetGeometry(dpy, d, &root, &xpos, &ypos, &w, &h, &bw, &depth);
230   *width = w;
231   *height = h;
232   return stat;
233}
234
235
236/**
237 * Return the size of the window (or pixmap) that corresponds to the
238 * given XMesaBuffer.
239 * \param width  returns width in pixels
240 * \param height  returns height in pixels
241 */
242void
243xmesa_get_window_size(XMesaDisplay *dpy, XMesaBuffer b,
244                      GLuint *width, GLuint *height)
245{
246   Status stat;
247
248   _glthread_LOCK_MUTEX(_xmesa_lock);
249   XSync(b->xm_visual->display, 0); /* added for Chromium */
250   stat = get_drawable_size(dpy, b->frontxrb->pixmap, width, height);
251   _glthread_UNLOCK_MUTEX(_xmesa_lock);
252
253   if (!stat) {
254      /* probably querying a window that's recently been destroyed */
255      _mesa_warning(NULL, "XGetGeometry failed!\n");
256      *width = *height = 1;
257   }
258}
259
260
261
262/**********************************************************************/
263/*****                Linked list of XMesaBuffers                 *****/
264/**********************************************************************/
265
266XMesaBuffer XMesaBufferList = NULL;
267
268
269/**
270 * Allocate a new XMesaBuffer object which corresponds to the given drawable.
271 * Note that XMesaBuffer is derived from struct gl_framebuffer.
272 * The new XMesaBuffer will not have any size (Width=Height=0).
273 *
274 * \param d  the corresponding X drawable (window or pixmap)
275 * \param type  either WINDOW, PIXMAP or PBUFFER, describing d
276 * \param vis  the buffer's visual
277 * \param cmap  the window's colormap, if known.
278 * \return new XMesaBuffer or NULL if any problem
279 */
280static XMesaBuffer
281create_xmesa_buffer(XMesaDrawable d, BufferType type,
282                    XMesaVisual vis, XMesaColormap cmap)
283{
284   XMesaBuffer b;
285
286   ASSERT(type == WINDOW || type == PIXMAP || type == PBUFFER);
287
288   b = (XMesaBuffer) CALLOC_STRUCT(xmesa_buffer);
289   if (!b)
290      return NULL;
291
292   b->display = vis->display;
293   b->xm_visual = vis;
294   b->type = type;
295   b->cmap = cmap;
296
297   _mesa_initialize_window_framebuffer(&b->mesa_buffer, &vis->mesa_visual);
298   b->mesa_buffer.Delete = xmesa_delete_framebuffer;
299
300   /*
301    * Front renderbuffer
302    */
303   b->frontxrb = xmesa_new_renderbuffer(NULL, 0, vis, GL_FALSE);
304   if (!b->frontxrb) {
305      free(b);
306      return NULL;
307   }
308   b->frontxrb->Parent = b;
309   b->frontxrb->drawable = d;
310   b->frontxrb->pixmap = (XMesaPixmap) d;
311   _mesa_add_renderbuffer(&b->mesa_buffer, BUFFER_FRONT_LEFT,
312                          &b->frontxrb->Base.Base);
313
314   /*
315    * Back renderbuffer
316    */
317   if (vis->mesa_visual.doubleBufferMode) {
318      b->backxrb = xmesa_new_renderbuffer(NULL, 0, vis, GL_TRUE);
319      if (!b->backxrb) {
320         /* XXX free front xrb too */
321         free(b);
322         return NULL;
323      }
324      b->backxrb->Parent = b;
325      /* determine back buffer implementation */
326      b->db_mode = vis->ximage_flag ? BACK_XIMAGE : BACK_PIXMAP;
327
328      _mesa_add_renderbuffer(&b->mesa_buffer, BUFFER_BACK_LEFT,
329                             &b->backxrb->Base.Base);
330   }
331
332   /*
333    * Other renderbuffer (depth, stencil, etc)
334    */
335   _swrast_add_soft_renderbuffers(&b->mesa_buffer,
336                                  GL_FALSE,  /* color */
337                                  vis->mesa_visual.haveDepthBuffer,
338                                  vis->mesa_visual.haveStencilBuffer,
339                                  vis->mesa_visual.haveAccumBuffer,
340                                  GL_FALSE,  /* software alpha buffer */
341                                  vis->mesa_visual.numAuxBuffers > 0 );
342
343   /* GLX_EXT_texture_from_pixmap */
344   b->TextureTarget = 0;
345   b->TextureFormat = GLX_TEXTURE_FORMAT_NONE_EXT;
346   b->TextureMipmap = 0;
347
348   /* insert buffer into linked list */
349   b->Next = XMesaBufferList;
350   XMesaBufferList = b;
351
352   return b;
353}
354
355
356/**
357 * Find an XMesaBuffer by matching X display and colormap but NOT matching
358 * the notThis buffer.
359 */
360XMesaBuffer
361xmesa_find_buffer(XMesaDisplay *dpy, XMesaColormap cmap, XMesaBuffer notThis)
362{
363   XMesaBuffer b;
364   for (b=XMesaBufferList; b; b=b->Next) {
365      if (b->display==dpy && b->cmap==cmap && b!=notThis) {
366         return b;
367      }
368   }
369   return NULL;
370}
371
372
373/**
374 * Remove buffer from linked list, delete if no longer referenced.
375 */
376static void
377xmesa_free_buffer(XMesaBuffer buffer)
378{
379   XMesaBuffer prev = NULL, b;
380
381   for (b = XMesaBufferList; b; b = b->Next) {
382      if (b == buffer) {
383         struct gl_framebuffer *fb = &buffer->mesa_buffer;
384
385         /* unlink buffer from list */
386         if (prev)
387            prev->Next = buffer->Next;
388         else
389            XMesaBufferList = buffer->Next;
390
391         /* mark as delete pending */
392         fb->DeletePending = GL_TRUE;
393
394         /* Since the X window for the XMesaBuffer is going away, we don't
395          * want to dereference this pointer in the future.
396          */
397         b->frontxrb->drawable = 0;
398
399         /* Unreference.  If count = zero we'll really delete the buffer */
400         _mesa_reference_framebuffer(&fb, NULL);
401
402         return;
403      }
404      /* continue search */
405      prev = b;
406   }
407   /* buffer not found in XMesaBufferList */
408   _mesa_problem(NULL,"xmesa_free_buffer() - buffer not found\n");
409}
410
411
412
413
414/**********************************************************************/
415/*****                   Misc Private Functions                   *****/
416/**********************************************************************/
417
418
419/**
420 * Setup RGB rendering for a window with a True/DirectColor visual.
421 */
422static void
423setup_truecolor(XMesaVisual v, XMesaBuffer buffer, XMesaColormap cmap)
424{
425   unsigned long rmask, gmask, bmask;
426   (void) buffer;
427   (void) cmap;
428
429   /* Compute red multiplier (mask) and bit shift */
430   v->rshift = 0;
431   rmask = GET_REDMASK(v);
432   while ((rmask & 1)==0) {
433      v->rshift++;
434      rmask = rmask >> 1;
435   }
436
437   /* Compute green multiplier (mask) and bit shift */
438   v->gshift = 0;
439   gmask = GET_GREENMASK(v);
440   while ((gmask & 1)==0) {
441      v->gshift++;
442      gmask = gmask >> 1;
443   }
444
445   /* Compute blue multiplier (mask) and bit shift */
446   v->bshift = 0;
447   bmask = GET_BLUEMASK(v);
448   while ((bmask & 1)==0) {
449      v->bshift++;
450      bmask = bmask >> 1;
451   }
452
453   /*
454    * Compute component-to-pixel lookup tables and dithering kernel
455    */
456   {
457      static GLubyte kernel[16] = {
458          0*16,  8*16,  2*16, 10*16,
459         12*16,  4*16, 14*16,  6*16,
460          3*16, 11*16,  1*16,  9*16,
461         15*16,  7*16, 13*16,  5*16,
462      };
463      GLint rBits = _mesa_bitcount(rmask);
464      GLint gBits = _mesa_bitcount(gmask);
465      GLint bBits = _mesa_bitcount(bmask);
466      GLint maxBits;
467      GLuint i;
468
469      /* convert pixel components in [0,_mask] to RGB values in [0,255] */
470      for (i=0; i<=rmask; i++)
471         v->PixelToR[i] = (unsigned char) ((i * 255) / rmask);
472      for (i=0; i<=gmask; i++)
473         v->PixelToG[i] = (unsigned char) ((i * 255) / gmask);
474      for (i=0; i<=bmask; i++)
475         v->PixelToB[i] = (unsigned char) ((i * 255) / bmask);
476
477      /* convert RGB values from [0,255] to pixel components */
478
479      for (i=0;i<256;i++) {
480         GLint r = gamma_adjust(v->RedGamma,   i, 255);
481         GLint g = gamma_adjust(v->GreenGamma, i, 255);
482         GLint b = gamma_adjust(v->BlueGamma,  i, 255);
483         v->RtoPixel[i] = (r >> (8-rBits)) << v->rshift;
484         v->GtoPixel[i] = (g >> (8-gBits)) << v->gshift;
485         v->BtoPixel[i] = (b >> (8-bBits)) << v->bshift;
486      }
487      /* overflow protection */
488      for (i=256;i<512;i++) {
489         v->RtoPixel[i] = v->RtoPixel[255];
490         v->GtoPixel[i] = v->GtoPixel[255];
491         v->BtoPixel[i] = v->BtoPixel[255];
492      }
493
494      /* setup dithering kernel */
495      maxBits = rBits;
496      if (gBits > maxBits)  maxBits = gBits;
497      if (bBits > maxBits)  maxBits = bBits;
498      for (i=0;i<16;i++) {
499         v->Kernel[i] = kernel[i] >> maxBits;
500      }
501
502      v->undithered_pf = PF_Truecolor;
503      v->dithered_pf = (GET_VISUAL_DEPTH(v)<24) ? PF_Dither_True : PF_Truecolor;
504   }
505
506   /*
507    * Now check for TrueColor visuals which we can optimize.
508    */
509   if (   GET_REDMASK(v)  ==0x0000ff
510       && GET_GREENMASK(v)==0x00ff00
511       && GET_BLUEMASK(v) ==0xff0000
512       && CHECK_BYTE_ORDER(v)
513       && v->BitsPerPixel==32
514       && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
515      /* common 32 bpp config used on SGI, Sun */
516      v->undithered_pf = v->dithered_pf = PF_8A8B8G8R; /* ABGR */
517   }
518   else if (GET_REDMASK(v)  == 0xff0000
519         && GET_GREENMASK(v)== 0x00ff00
520         && GET_BLUEMASK(v) == 0x0000ff
521         && CHECK_BYTE_ORDER(v)
522         && v->RedGamma == 1.0 && v->GreenGamma == 1.0 && v->BlueGamma == 1.0){
523      if (v->BitsPerPixel==32) {
524         /* if 32 bpp, and visual indicates 8 bpp alpha channel */
525         if (GET_VISUAL_DEPTH(v) == 32 && v->mesa_visual.alphaBits == 8)
526            v->undithered_pf = v->dithered_pf = PF_8A8R8G8B; /* ARGB */
527         else
528            v->undithered_pf = v->dithered_pf = PF_8R8G8B; /* xRGB */
529      }
530      else if (v->BitsPerPixel == 24) {
531         v->undithered_pf = v->dithered_pf = PF_8R8G8B24; /* RGB */
532      }
533   }
534   else if (GET_REDMASK(v)  ==0xf800
535       &&   GET_GREENMASK(v)==0x07e0
536       &&   GET_BLUEMASK(v) ==0x001f
537       && CHECK_BYTE_ORDER(v)
538       && v->BitsPerPixel==16
539       && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
540      /* 5-6-5 RGB */
541      v->undithered_pf = PF_5R6G5B;
542      v->dithered_pf = PF_Dither_5R6G5B;
543   }
544}
545
546
547/**
548 * When a context is bound for the first time, we can finally finish
549 * initializing the context's visual and buffer information.
550 * \param v  the XMesaVisual to initialize
551 * \param b  the XMesaBuffer to initialize (may be NULL)
552 * \param rgb_flag  TRUE = RGBA mode, FALSE = color index mode
553 * \param window  the window/pixmap we're rendering into
554 * \param cmap  the colormap associated with the window/pixmap
555 * \return GL_TRUE=success, GL_FALSE=failure
556 */
557static GLboolean
558initialize_visual_and_buffer(XMesaVisual v, XMesaBuffer b,
559                             XMesaDrawable window,
560                             XMesaColormap cmap)
561{
562   const int xclass = v->visualType;
563
564
565   ASSERT(!b || b->xm_visual == v);
566
567   /* Save true bits/pixel */
568   v->BitsPerPixel = bits_per_pixel(v);
569   assert(v->BitsPerPixel > 0);
570
571   /* RGB WINDOW:
572    * We support RGB rendering into almost any kind of visual.
573    */
574   if (xclass == GLX_TRUE_COLOR || xclass == GLX_DIRECT_COLOR) {
575      setup_truecolor( v, b, cmap );
576   }
577   else {
578      _mesa_warning(NULL, "XMesa: RGB mode rendering not supported in given visual.\n");
579      return GL_FALSE;
580   }
581   v->mesa_visual.indexBits = 0;
582
583   if (_mesa_getenv("MESA_NO_DITHER")) {
584      v->dithered_pf = v->undithered_pf;
585   }
586
587
588   /*
589    * If MESA_INFO env var is set print out some debugging info
590    * which can help Brian figure out what's going on when a user
591    * reports bugs.
592    */
593   if (_mesa_getenv("MESA_INFO")) {
594      printf("X/Mesa visual = %p\n", (void *) v);
595      printf("X/Mesa dithered pf = %u\n", v->dithered_pf);
596      printf("X/Mesa undithered pf = %u\n", v->undithered_pf);
597      printf("X/Mesa level = %d\n", v->mesa_visual.level);
598      printf("X/Mesa depth = %d\n", GET_VISUAL_DEPTH(v));
599      printf("X/Mesa bits per pixel = %d\n", v->BitsPerPixel);
600   }
601
602   if (b && window) {
603      /* Do window-specific initializations */
604
605      /* these should have been set in create_xmesa_buffer */
606      ASSERT(b->frontxrb->drawable == window);
607      ASSERT(b->frontxrb->pixmap == (XMesaPixmap) window);
608
609      /* Setup for single/double buffering */
610      if (v->mesa_visual.doubleBufferMode) {
611         /* Double buffered */
612         b->shm = check_for_xshm( v->display );
613      }
614
615      /* X11 graphics contexts */
616      b->gc = XCreateGC( v->display, window, 0, NULL );
617      XMesaSetFunction( v->display, b->gc, GXcopy );
618
619      /* cleargc - for glClear() */
620      b->cleargc = XCreateGC( v->display, window, 0, NULL );
621      XMesaSetFunction( v->display, b->cleargc, GXcopy );
622
623      /*
624       * Don't generate Graphics Expose/NoExpose events in swapbuffers().
625       * Patch contributed by Michael Pichler May 15, 1995.
626       */
627      {
628         XGCValues gcvalues;
629         gcvalues.graphics_exposures = False;
630         b->swapgc = XCreateGC(v->display, window,
631                               GCGraphicsExposures, &gcvalues);
632      }
633      XMesaSetFunction( v->display, b->swapgc, GXcopy );
634   }
635
636   return GL_TRUE;
637}
638
639
640
641/*
642 * Convert an RGBA color to a pixel value.
643 */
644unsigned long
645xmesa_color_to_pixel(struct gl_context *ctx,
646                     GLubyte r, GLubyte g, GLubyte b, GLubyte a,
647                     GLuint pixelFormat)
648{
649   XMesaContext xmesa = XMESA_CONTEXT(ctx);
650   switch (pixelFormat) {
651      case PF_Truecolor:
652         {
653            unsigned long p;
654            PACK_TRUECOLOR( p, r, g, b );
655            return p;
656         }
657      case PF_8A8B8G8R:
658         return PACK_8A8B8G8R( r, g, b, a );
659      case PF_8A8R8G8B:
660         return PACK_8A8R8G8B( r, g, b, a );
661      case PF_8R8G8B:
662         /* fall through */
663      case PF_8R8G8B24:
664         return PACK_8R8G8B( r, g, b );
665      case PF_5R6G5B:
666         return PACK_5R6G5B( r, g, b );
667      case PF_Dither_True:
668         /* fall through */
669      case PF_Dither_5R6G5B:
670         {
671            unsigned long p;
672            PACK_TRUEDITHER(p, 1, 0, r, g, b);
673            return p;
674         }
675      default:
676         _mesa_problem(ctx, "Bad pixel format in xmesa_color_to_pixel");
677   }
678   return 0;
679}
680
681
682#define NUM_VISUAL_TYPES   6
683
684/**
685 * Convert an X visual type to a GLX visual type.
686 *
687 * \param visualType X visual type (i.e., \c TrueColor, \c StaticGray, etc.)
688 *        to be converted.
689 * \return If \c visualType is a valid X visual type, a GLX visual type will
690 *         be returned.  Otherwise \c GLX_NONE will be returned.
691 *
692 * \note
693 * This code was lifted directly from lib/GL/glx/glcontextmodes.c in the
694 * DRI CVS tree.
695 */
696static GLint
697xmesa_convert_from_x_visual_type( int visualType )
698{
699    static const int glx_visual_types[ NUM_VISUAL_TYPES ] = {
700	GLX_STATIC_GRAY,  GLX_GRAY_SCALE,
701	GLX_STATIC_COLOR, GLX_PSEUDO_COLOR,
702	GLX_TRUE_COLOR,   GLX_DIRECT_COLOR
703    };
704
705    return ( (unsigned) visualType < NUM_VISUAL_TYPES )
706	? glx_visual_types[ visualType ] : GLX_NONE;
707}
708
709
710/**********************************************************************/
711/*****                       Public Functions                     *****/
712/**********************************************************************/
713
714
715/*
716 * Create a new X/Mesa visual.
717 * Input:  display - X11 display
718 *         visinfo - an XVisualInfo pointer
719 *         rgb_flag - GL_TRUE = RGB mode,
720 *                    GL_FALSE = color index mode
721 *         alpha_flag - alpha buffer requested?
722 *         db_flag - GL_TRUE = double-buffered,
723 *                   GL_FALSE = single buffered
724 *         stereo_flag - stereo visual?
725 *         ximage_flag - GL_TRUE = use an XImage for back buffer,
726 *                       GL_FALSE = use an off-screen pixmap for back buffer
727 *         depth_size - requested bits/depth values, or zero
728 *         stencil_size - requested bits/stencil values, or zero
729 *         accum_red_size - requested bits/red accum values, or zero
730 *         accum_green_size - requested bits/green accum values, or zero
731 *         accum_blue_size - requested bits/blue accum values, or zero
732 *         accum_alpha_size - requested bits/alpha accum values, or zero
733 *         num_samples - number of samples/pixel if multisampling, or zero
734 *         level - visual level, usually 0
735 *         visualCaveat - ala the GLX extension, usually GLX_NONE
736 * Return;  a new XMesaVisual or 0 if error.
737 */
738PUBLIC
739XMesaVisual XMesaCreateVisual( XMesaDisplay *display,
740                               XMesaVisualInfo visinfo,
741                               GLboolean rgb_flag,
742                               GLboolean alpha_flag,
743                               GLboolean db_flag,
744                               GLboolean stereo_flag,
745                               GLboolean ximage_flag,
746                               GLint depth_size,
747                               GLint stencil_size,
748                               GLint accum_red_size,
749                               GLint accum_green_size,
750                               GLint accum_blue_size,
751                               GLint accum_alpha_size,
752                               GLint num_samples,
753                               GLint level,
754                               GLint visualCaveat )
755{
756   char *gamma;
757   XMesaVisual v;
758   GLint red_bits, green_bits, blue_bits, alpha_bits;
759
760   /* For debugging only */
761   if (_mesa_getenv("MESA_XSYNC")) {
762      /* This makes debugging X easier.
763       * In your debugger, set a breakpoint on _XError to stop when an
764       * X protocol error is generated.
765       */
766      XSynchronize( display, 1 );
767   }
768
769   /* Color-index rendering not supported. */
770   if (!rgb_flag)
771      return NULL;
772
773   v = (XMesaVisual) CALLOC_STRUCT(xmesa_visual);
774   if (!v) {
775      return NULL;
776   }
777
778   v->display = display;
779
780   /* Save a copy of the XVisualInfo struct because the user may Xfree()
781    * the struct but we may need some of the information contained in it
782    * at a later time.
783    */
784   v->visinfo = (XVisualInfo *) MALLOC(sizeof(*visinfo));
785   if(!v->visinfo) {
786      free(v);
787      return NULL;
788   }
789   memcpy(v->visinfo, visinfo, sizeof(*visinfo));
790
791   /* check for MESA_GAMMA environment variable */
792   gamma = _mesa_getenv("MESA_GAMMA");
793   if (gamma) {
794      v->RedGamma = v->GreenGamma = v->BlueGamma = 0.0;
795      sscanf( gamma, "%f %f %f", &v->RedGamma, &v->GreenGamma, &v->BlueGamma );
796      if (v->RedGamma<=0.0)    v->RedGamma = 1.0;
797      if (v->GreenGamma<=0.0)  v->GreenGamma = v->RedGamma;
798      if (v->BlueGamma<=0.0)   v->BlueGamma = v->RedGamma;
799   }
800   else {
801      v->RedGamma = v->GreenGamma = v->BlueGamma = 1.0;
802   }
803
804   v->ximage_flag = ximage_flag;
805
806   v->mesa_visual.redMask = visinfo->red_mask;
807   v->mesa_visual.greenMask = visinfo->green_mask;
808   v->mesa_visual.blueMask = visinfo->blue_mask;
809   v->visualID = visinfo->visualid;
810   v->screen = visinfo->screen;
811
812#if !(defined(__cplusplus) || defined(c_plusplus))
813   v->visualType = xmesa_convert_from_x_visual_type(visinfo->class);
814#else
815   v->visualType = xmesa_convert_from_x_visual_type(visinfo->c_class);
816#endif
817
818   v->mesa_visual.visualRating = visualCaveat;
819
820   if (alpha_flag)
821      v->mesa_visual.alphaBits = 8;
822
823   (void) initialize_visual_and_buffer( v, NULL, 0, 0 );
824
825   {
826      const int xclass = v->visualType;
827      if (xclass == GLX_TRUE_COLOR || xclass == GLX_DIRECT_COLOR) {
828         red_bits   = _mesa_bitcount(GET_REDMASK(v));
829         green_bits = _mesa_bitcount(GET_GREENMASK(v));
830         blue_bits  = _mesa_bitcount(GET_BLUEMASK(v));
831      }
832      else {
833         /* this is an approximation */
834         int depth;
835         depth = GET_VISUAL_DEPTH(v);
836         red_bits = depth / 3;
837         depth -= red_bits;
838         green_bits = depth / 2;
839         depth -= green_bits;
840         blue_bits = depth;
841         alpha_bits = 0;
842         assert( red_bits + green_bits + blue_bits == GET_VISUAL_DEPTH(v) );
843      }
844      alpha_bits = v->mesa_visual.alphaBits;
845   }
846
847   if (!_mesa_initialize_visual(&v->mesa_visual,
848                                db_flag, stereo_flag,
849                                red_bits, green_bits,
850                                blue_bits, alpha_bits,
851                                depth_size,
852                                stencil_size,
853                                accum_red_size, accum_green_size,
854                                accum_blue_size, accum_alpha_size,
855                                0)) {
856      FREE(v);
857      return NULL;
858   }
859
860   /* XXX minor hack */
861   v->mesa_visual.level = level;
862   return v;
863}
864
865
866PUBLIC
867void XMesaDestroyVisual( XMesaVisual v )
868{
869   free(v->visinfo);
870   free(v);
871}
872
873
874
875/**
876 * Create a new XMesaContext.
877 * \param v  the XMesaVisual
878 * \param share_list  another XMesaContext with which to share display
879 *                    lists or NULL if no sharing is wanted.
880 * \return an XMesaContext or NULL if error.
881 */
882PUBLIC
883XMesaContext XMesaCreateContext( XMesaVisual v, XMesaContext share_list )
884{
885   static GLboolean firstTime = GL_TRUE;
886   XMesaContext c;
887   struct gl_context *mesaCtx;
888   struct dd_function_table functions;
889   TNLcontext *tnl;
890
891   if (firstTime) {
892      _glthread_INIT_MUTEX(_xmesa_lock);
893      firstTime = GL_FALSE;
894   }
895
896   /* Note: the XMesaContext contains a Mesa struct gl_context struct (inheritance) */
897   c = (XMesaContext) CALLOC_STRUCT(xmesa_context);
898   if (!c)
899      return NULL;
900
901   mesaCtx = &(c->mesa);
902
903   /* initialize with default driver functions, then plug in XMesa funcs */
904   _mesa_init_driver_functions(&functions);
905   xmesa_init_driver_functions(v, &functions);
906   if (!_mesa_initialize_context(mesaCtx, API_OPENGL, &v->mesa_visual,
907                      share_list ? &(share_list->mesa) : (struct gl_context *) NULL,
908                      &functions, (void *) c)) {
909      free(c);
910      return NULL;
911   }
912
913   /* Enable this to exercise fixed function -> shader translation
914    * with software rendering.
915    */
916   if (0) {
917      mesaCtx->VertexProgram._MaintainTnlProgram = GL_TRUE;
918      mesaCtx->FragmentProgram._MaintainTexEnvProgram = GL_TRUE;
919   }
920
921   _mesa_enable_sw_extensions(mesaCtx);
922   _mesa_enable_1_3_extensions(mesaCtx);
923   _mesa_enable_1_4_extensions(mesaCtx);
924   _mesa_enable_1_5_extensions(mesaCtx);
925   _mesa_enable_2_0_extensions(mesaCtx);
926   _mesa_enable_2_1_extensions(mesaCtx);
927    if (mesaCtx->Mesa_DXTn) {
928       _mesa_enable_extension(mesaCtx, "GL_EXT_texture_compression_s3tc");
929       _mesa_enable_extension(mesaCtx, "GL_S3_s3tc");
930    }
931    _mesa_enable_extension(mesaCtx, "GL_3DFX_texture_compression_FXT1");
932#if ENABLE_EXT_timer_query
933    _mesa_enable_extension(mesaCtx, "GL_EXT_timer_query");
934#endif
935
936
937   /* finish up xmesa context initializations */
938   c->swapbytes = CHECK_BYTE_ORDER(v) ? GL_FALSE : GL_TRUE;
939   c->xm_visual = v;
940   c->xm_buffer = NULL;   /* set later by XMesaMakeCurrent */
941   c->display = v->display;
942   c->pixelformat = v->dithered_pf;      /* Dithering is enabled by default */
943
944   /* Initialize the software rasterizer and helper modules.
945    */
946   if (!_swrast_CreateContext( mesaCtx ) ||
947       !_vbo_CreateContext( mesaCtx ) ||
948       !_tnl_CreateContext( mesaCtx ) ||
949       !_swsetup_CreateContext( mesaCtx )) {
950      _mesa_free_context_data(&c->mesa);
951      free(c);
952      return NULL;
953   }
954
955   /* tnl setup */
956   tnl = TNL_CONTEXT(mesaCtx);
957   tnl->Driver.RunPipeline = _tnl_run_pipeline;
958   /* swrast setup */
959   xmesa_register_swrast_functions( mesaCtx );
960   _swsetup_Wakeup(mesaCtx);
961
962   _mesa_meta_init(mesaCtx);
963
964   return c;
965}
966
967
968
969PUBLIC
970void XMesaDestroyContext( XMesaContext c )
971{
972   struct gl_context *mesaCtx = &c->mesa;
973
974   _mesa_meta_free( mesaCtx );
975
976   _swsetup_DestroyContext( mesaCtx );
977   _swrast_DestroyContext( mesaCtx );
978   _tnl_DestroyContext( mesaCtx );
979   _vbo_DestroyContext( mesaCtx );
980   _mesa_free_context_data( mesaCtx );
981   free( c );
982}
983
984
985
986/**
987 * Private function for creating an XMesaBuffer which corresponds to an
988 * X window or pixmap.
989 * \param v  the window's XMesaVisual
990 * \param w  the window we're wrapping
991 * \return  new XMesaBuffer or NULL if error
992 */
993PUBLIC XMesaBuffer
994XMesaCreateWindowBuffer(XMesaVisual v, XMesaWindow w)
995{
996   XWindowAttributes attr;
997   XMesaBuffer b;
998   XMesaColormap cmap;
999   int depth;
1000
1001   assert(v);
1002   assert(w);
1003
1004   /* Check that window depth matches visual depth */
1005   XGetWindowAttributes( v->display, w, &attr );
1006   depth = attr.depth;
1007   if (GET_VISUAL_DEPTH(v) != depth) {
1008      _mesa_warning(NULL, "XMesaCreateWindowBuffer: depth mismatch between visual (%d) and window (%d)!\n",
1009                    GET_VISUAL_DEPTH(v), depth);
1010      return NULL;
1011   }
1012
1013   /* Find colormap */
1014   if (attr.colormap) {
1015      cmap = attr.colormap;
1016   }
1017   else {
1018      _mesa_warning(NULL, "Window %u has no colormap!\n", (unsigned int) w);
1019      /* this is weird, a window w/out a colormap!? */
1020      /* OK, let's just allocate a new one and hope for the best */
1021      cmap = XCreateColormap(v->display, w, attr.visual, AllocNone);
1022   }
1023
1024   b = create_xmesa_buffer((XMesaDrawable) w, WINDOW, v, cmap);
1025   if (!b)
1026      return NULL;
1027
1028   if (!initialize_visual_and_buffer( v, b, (XMesaDrawable) w, cmap )) {
1029      xmesa_free_buffer(b);
1030      return NULL;
1031   }
1032
1033   return b;
1034}
1035
1036
1037
1038/**
1039 * Create a new XMesaBuffer from an X pixmap.
1040 *
1041 * \param v    the XMesaVisual
1042 * \param p    the pixmap
1043 * \param cmap the colormap, may be 0 if using a \c GLX_TRUE_COLOR or
1044 *             \c GLX_DIRECT_COLOR visual for the pixmap
1045 * \returns new XMesaBuffer or NULL if error
1046 */
1047PUBLIC XMesaBuffer
1048XMesaCreatePixmapBuffer(XMesaVisual v, XMesaPixmap p, XMesaColormap cmap)
1049{
1050   XMesaBuffer b;
1051
1052   assert(v);
1053
1054   b = create_xmesa_buffer((XMesaDrawable) p, PIXMAP, v, cmap);
1055   if (!b)
1056      return NULL;
1057
1058   if (!initialize_visual_and_buffer(v, b, (XMesaDrawable) p, cmap)) {
1059      xmesa_free_buffer(b);
1060      return NULL;
1061   }
1062
1063   return b;
1064}
1065
1066
1067/**
1068 * For GLX_EXT_texture_from_pixmap
1069 */
1070XMesaBuffer
1071XMesaCreatePixmapTextureBuffer(XMesaVisual v, XMesaPixmap p,
1072                               XMesaColormap cmap,
1073                               int format, int target, int mipmap)
1074{
1075   GET_CURRENT_CONTEXT(ctx);
1076   XMesaBuffer b;
1077   GLuint width, height;
1078
1079   assert(v);
1080
1081   b = create_xmesa_buffer((XMesaDrawable) p, PIXMAP, v, cmap);
1082   if (!b)
1083      return NULL;
1084
1085   /* get pixmap size, update framebuffer/renderbuffer dims */
1086   xmesa_get_window_size(v->display, b, &width, &height);
1087   _mesa_resize_framebuffer(NULL, &(b->mesa_buffer), width, height);
1088
1089   if (target == 0) {
1090      /* examine dims */
1091      if (ctx->Extensions.ARB_texture_non_power_of_two) {
1092         target = GLX_TEXTURE_2D_EXT;
1093      }
1094      else if (   _mesa_bitcount(width)  == 1
1095               && _mesa_bitcount(height) == 1) {
1096         /* power of two size */
1097         if (height == 1) {
1098            target = GLX_TEXTURE_1D_EXT;
1099         }
1100         else {
1101            target = GLX_TEXTURE_2D_EXT;
1102         }
1103      }
1104      else if (ctx->Extensions.NV_texture_rectangle) {
1105         target = GLX_TEXTURE_RECTANGLE_EXT;
1106      }
1107      else {
1108         /* non power of two textures not supported */
1109         XMesaDestroyBuffer(b);
1110         return 0;
1111      }
1112   }
1113
1114   b->TextureTarget = target;
1115   b->TextureFormat = format;
1116   b->TextureMipmap = mipmap;
1117
1118   if (!initialize_visual_and_buffer(v, b, (XMesaDrawable) p, cmap)) {
1119      xmesa_free_buffer(b);
1120      return NULL;
1121   }
1122
1123   return b;
1124}
1125
1126
1127
1128XMesaBuffer
1129XMesaCreatePBuffer(XMesaVisual v, XMesaColormap cmap,
1130                   unsigned int width, unsigned int height)
1131{
1132   XMesaWindow root;
1133   XMesaDrawable drawable;  /* X Pixmap Drawable */
1134   XMesaBuffer b;
1135
1136   /* allocate pixmap for front buffer */
1137   root = RootWindow( v->display, v->visinfo->screen );
1138   drawable = XCreatePixmap(v->display, root, width, height,
1139                            v->visinfo->depth);
1140   if (!drawable)
1141      return NULL;
1142
1143   b = create_xmesa_buffer(drawable, PBUFFER, v, cmap);
1144   if (!b)
1145      return NULL;
1146
1147   if (!initialize_visual_and_buffer(v, b, drawable, cmap)) {
1148      xmesa_free_buffer(b);
1149      return NULL;
1150   }
1151
1152   return b;
1153}
1154
1155
1156
1157/*
1158 * Deallocate an XMesaBuffer structure and all related info.
1159 */
1160PUBLIC void
1161XMesaDestroyBuffer(XMesaBuffer b)
1162{
1163   xmesa_free_buffer(b);
1164}
1165
1166
1167/**
1168 * Query the current window size and update the corresponding struct gl_framebuffer
1169 * and all attached renderbuffers.
1170 * Called when:
1171 *  1. the first time a buffer is bound to a context.
1172 *  2. from glViewport to poll for window size changes
1173 *  3. from the XMesaResizeBuffers() API function.
1174 * Note: it's possible (and legal) for xmctx to be NULL.  That can happen
1175 * when resizing a buffer when no rendering context is bound.
1176 */
1177void
1178xmesa_check_and_update_buffer_size(XMesaContext xmctx, XMesaBuffer drawBuffer)
1179{
1180   GLuint width, height;
1181   xmesa_get_window_size(drawBuffer->display, drawBuffer, &width, &height);
1182   if (drawBuffer->mesa_buffer.Width != width ||
1183       drawBuffer->mesa_buffer.Height != height) {
1184      struct gl_context *ctx = xmctx ? &xmctx->mesa : NULL;
1185      _mesa_resize_framebuffer(ctx, &(drawBuffer->mesa_buffer), width, height);
1186   }
1187   drawBuffer->mesa_buffer.Initialized = GL_TRUE; /* XXX TEMPORARY? */
1188}
1189
1190
1191/*
1192 * Bind buffer b to context c and make c the current rendering context.
1193 */
1194GLboolean XMesaMakeCurrent( XMesaContext c, XMesaBuffer b )
1195{
1196   return XMesaMakeCurrent2( c, b, b );
1197}
1198
1199
1200/*
1201 * Bind buffer b to context c and make c the current rendering context.
1202 */
1203PUBLIC
1204GLboolean XMesaMakeCurrent2( XMesaContext c, XMesaBuffer drawBuffer,
1205                             XMesaBuffer readBuffer )
1206{
1207   if (c) {
1208      if (!drawBuffer || !readBuffer)
1209         return GL_FALSE;  /* must specify buffers! */
1210
1211      if (&(c->mesa) == _mesa_get_current_context()
1212          && c->mesa.DrawBuffer == &drawBuffer->mesa_buffer
1213          && c->mesa.ReadBuffer == &readBuffer->mesa_buffer
1214          && XMESA_BUFFER(c->mesa.DrawBuffer)->wasCurrent) {
1215         /* same context and buffer, do nothing */
1216         return GL_TRUE;
1217      }
1218
1219      c->xm_buffer = drawBuffer;
1220
1221      /* Call this periodically to detect when the user has begun using
1222       * GL rendering from multiple threads.
1223       */
1224      _glapi_check_multithread();
1225
1226      xmesa_check_and_update_buffer_size(c, drawBuffer);
1227      if (readBuffer != drawBuffer)
1228         xmesa_check_and_update_buffer_size(c, readBuffer);
1229
1230      _mesa_make_current(&(c->mesa),
1231                         &drawBuffer->mesa_buffer,
1232                         &readBuffer->mesa_buffer);
1233
1234      /*
1235       * Must recompute and set these pixel values because colormap
1236       * can be different for different windows.
1237       */
1238      c->clearpixel = xmesa_color_to_pixel( &c->mesa,
1239					    c->clearcolor[0],
1240					    c->clearcolor[1],
1241					    c->clearcolor[2],
1242					    c->clearcolor[3],
1243					    c->xm_visual->undithered_pf);
1244      XMesaSetForeground(c->display, drawBuffer->cleargc, c->clearpixel);
1245
1246      /* Solution to Stephane Rehel's problem with glXReleaseBuffersMESA(): */
1247      drawBuffer->wasCurrent = GL_TRUE;
1248   }
1249   else {
1250      /* Detach */
1251      _mesa_make_current( NULL, NULL, NULL );
1252   }
1253   return GL_TRUE;
1254}
1255
1256
1257/*
1258 * Unbind the context c from its buffer.
1259 */
1260GLboolean XMesaUnbindContext( XMesaContext c )
1261{
1262   /* A no-op for XFree86 integration purposes */
1263   return GL_TRUE;
1264}
1265
1266
1267XMesaContext XMesaGetCurrentContext( void )
1268{
1269   GET_CURRENT_CONTEXT(ctx);
1270   if (ctx) {
1271      XMesaContext xmesa = XMESA_CONTEXT(ctx);
1272      return xmesa;
1273   }
1274   else {
1275      return 0;
1276   }
1277}
1278
1279
1280XMesaBuffer XMesaGetCurrentBuffer( void )
1281{
1282   GET_CURRENT_CONTEXT(ctx);
1283   if (ctx) {
1284      XMesaBuffer xmbuf = XMESA_BUFFER(ctx->DrawBuffer);
1285      return xmbuf;
1286   }
1287   else {
1288      return 0;
1289   }
1290}
1291
1292
1293/* New in Mesa 3.1 */
1294XMesaBuffer XMesaGetCurrentReadBuffer( void )
1295{
1296   GET_CURRENT_CONTEXT(ctx);
1297   if (ctx) {
1298      return XMESA_BUFFER(ctx->ReadBuffer);
1299   }
1300   else {
1301      return 0;
1302   }
1303}
1304
1305
1306
1307GLboolean XMesaSetFXmode( GLint mode )
1308{
1309   (void) mode;
1310   return GL_FALSE;
1311}
1312
1313
1314
1315/*
1316 * Copy the back buffer to the front buffer.  If there's no back buffer
1317 * this is a no-op.
1318 */
1319PUBLIC
1320void XMesaSwapBuffers( XMesaBuffer b )
1321{
1322   GET_CURRENT_CONTEXT(ctx);
1323
1324   if (!b->backxrb) {
1325      /* single buffered */
1326      return;
1327   }
1328
1329   /* If we're swapping the buffer associated with the current context
1330    * we have to flush any pending rendering commands first.
1331    */
1332   if (ctx && ctx->DrawBuffer == &(b->mesa_buffer))
1333      _mesa_notifySwapBuffers(ctx);
1334
1335   if (b->db_mode) {
1336      if (b->backxrb->ximage) {
1337	 /* Copy Ximage (back buf) from client memory to server window */
1338#if defined(USE_XSHM)
1339	 if (b->shm) {
1340            /*_glthread_LOCK_MUTEX(_xmesa_lock);*/
1341	    XShmPutImage( b->xm_visual->display, b->frontxrb->drawable,
1342			  b->swapgc,
1343			  b->backxrb->ximage, 0, 0,
1344			  0, 0, b->mesa_buffer.Width, b->mesa_buffer.Height,
1345                          False );
1346            /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/
1347	 }
1348	 else
1349#endif
1350         {
1351            /*_glthread_LOCK_MUTEX(_xmesa_lock);*/
1352            XMesaPutImage( b->xm_visual->display, b->frontxrb->drawable,
1353			   b->swapgc,
1354			   b->backxrb->ximage, 0, 0,
1355			   0, 0, b->mesa_buffer.Width, b->mesa_buffer.Height );
1356            /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/
1357         }
1358      }
1359      else if (b->backxrb->pixmap) {
1360	 /* Copy pixmap (back buf) to window (front buf) on server */
1361         /*_glthread_LOCK_MUTEX(_xmesa_lock);*/
1362	 XMesaCopyArea( b->xm_visual->display,
1363			b->backxrb->pixmap,   /* source drawable */
1364			b->frontxrb->drawable,  /* dest. drawable */
1365			b->swapgc,
1366			0, 0, b->mesa_buffer.Width, b->mesa_buffer.Height,
1367			0, 0                 /* dest region */
1368		      );
1369         /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/
1370      }
1371   }
1372   XSync( b->xm_visual->display, False );
1373}
1374
1375
1376
1377/*
1378 * Copy sub-region of back buffer to front buffer
1379 */
1380void XMesaCopySubBuffer( XMesaBuffer b, int x, int y, int width, int height )
1381{
1382   GET_CURRENT_CONTEXT(ctx);
1383
1384   /* If we're swapping the buffer associated with the current context
1385    * we have to flush any pending rendering commands first.
1386    */
1387   if (ctx && ctx->DrawBuffer == &(b->mesa_buffer))
1388      _mesa_notifySwapBuffers(ctx);
1389
1390   if (!b->backxrb) {
1391      /* single buffered */
1392      return;
1393   }
1394
1395   if (b->db_mode) {
1396      int yTop = b->mesa_buffer.Height - y - height;
1397      if (b->backxrb->ximage) {
1398         /* Copy Ximage from host's memory to server's window */
1399#if defined(USE_XSHM)
1400         if (b->shm) {
1401            /* XXX assuming width and height aren't too large! */
1402            XShmPutImage( b->xm_visual->display, b->frontxrb->drawable,
1403                          b->swapgc,
1404                          b->backxrb->ximage, x, yTop,
1405                          x, yTop, width, height, False );
1406            /* wait for finished event??? */
1407         }
1408         else
1409#endif
1410         {
1411            /* XXX assuming width and height aren't too large! */
1412            XMesaPutImage( b->xm_visual->display, b->frontxrb->drawable,
1413			   b->swapgc,
1414			   b->backxrb->ximage, x, yTop,
1415			   x, yTop, width, height );
1416         }
1417      }
1418      else {
1419         /* Copy pixmap to window on server */
1420         XMesaCopyArea( b->xm_visual->display,
1421			b->backxrb->pixmap,           /* source drawable */
1422			b->frontxrb->drawable,        /* dest. drawable */
1423			b->swapgc,
1424			x, yTop, width, height,  /* source region */
1425			x, yTop                  /* dest region */
1426                      );
1427      }
1428   }
1429}
1430
1431
1432/*
1433 * Return a pointer to the XMesa backbuffer Pixmap or XImage.  This function
1434 * is a way to get "under the hood" of X/Mesa so one can manipulate the
1435 * back buffer directly.
1436 * Output:  pixmap - pointer to back buffer's Pixmap, or 0
1437 *          ximage - pointer to back buffer's XImage, or NULL
1438 * Return:  GL_TRUE = context is double buffered
1439 *          GL_FALSE = context is single buffered
1440 */
1441GLboolean XMesaGetBackBuffer( XMesaBuffer b,
1442                              XMesaPixmap *pixmap,
1443                              XMesaImage **ximage )
1444{
1445   if (b->db_mode) {
1446      if (pixmap)
1447         *pixmap = b->backxrb->pixmap;
1448      if (ximage)
1449         *ximage = b->backxrb->ximage;
1450      return GL_TRUE;
1451   }
1452   else {
1453      *pixmap = 0;
1454      *ximage = NULL;
1455      return GL_FALSE;
1456   }
1457}
1458
1459
1460/*
1461 * Return the depth buffer associated with an XMesaBuffer.
1462 * Input:  b - the XMesa buffer handle
1463 * Output:  width, height - size of buffer in pixels
1464 *          bytesPerValue - bytes per depth value (2 or 4)
1465 *          buffer - pointer to depth buffer values
1466 * Return:  GL_TRUE or GL_FALSE to indicate success or failure.
1467 */
1468GLboolean XMesaGetDepthBuffer( XMesaBuffer b, GLint *width, GLint *height,
1469                               GLint *bytesPerValue, void **buffer )
1470{
1471   struct gl_renderbuffer *rb
1472      = b->mesa_buffer.Attachment[BUFFER_DEPTH].Renderbuffer;
1473   struct xmesa_renderbuffer *xrb = xmesa_renderbuffer(rb);
1474
1475   if (!xrb || !xrb->Base.Buffer) {
1476      *width = 0;
1477      *height = 0;
1478      *bytesPerValue = 0;
1479      *buffer = 0;
1480      return GL_FALSE;
1481   }
1482   else {
1483      *width = b->mesa_buffer.Width;
1484      *height = b->mesa_buffer.Height;
1485      *bytesPerValue = b->mesa_buffer.Visual.depthBits <= 16
1486         ? sizeof(GLushort) : sizeof(GLuint);
1487      *buffer = (void *) xrb->Base.Buffer;
1488      return GL_TRUE;
1489   }
1490}
1491
1492
1493void XMesaFlush( XMesaContext c )
1494{
1495   if (c && c->xm_visual) {
1496      XSync( c->xm_visual->display, False );
1497   }
1498}
1499
1500
1501
1502const char *XMesaGetString( XMesaContext c, int name )
1503{
1504   (void) c;
1505   if (name==XMESA_VERSION) {
1506      return "5.0";
1507   }
1508   else if (name==XMESA_EXTENSIONS) {
1509      return "";
1510   }
1511   else {
1512      return NULL;
1513   }
1514}
1515
1516
1517
1518XMesaBuffer XMesaFindBuffer( XMesaDisplay *dpy, XMesaDrawable d )
1519{
1520   XMesaBuffer b;
1521   for (b=XMesaBufferList; b; b=b->Next) {
1522      if (b->frontxrb->drawable == d && b->display == dpy) {
1523         return b;
1524      }
1525   }
1526   return NULL;
1527}
1528
1529
1530/**
1531 * Free/destroy all XMesaBuffers associated with given display.
1532 */
1533void xmesa_destroy_buffers_on_display(XMesaDisplay *dpy)
1534{
1535   XMesaBuffer b, next;
1536   for (b = XMesaBufferList; b; b = next) {
1537      next = b->Next;
1538      if (b->display == dpy) {
1539         xmesa_free_buffer(b);
1540      }
1541   }
1542}
1543
1544
1545/*
1546 * Look for XMesaBuffers whose X window has been destroyed.
1547 * Deallocate any such XMesaBuffers.
1548 */
1549void XMesaGarbageCollect( XMesaDisplay* dpy )
1550{
1551   XMesaBuffer b, next;
1552   for (b=XMesaBufferList; b; b=next) {
1553      next = b->Next;
1554      if (b->display && b->display == dpy && b->frontxrb->drawable && b->type == WINDOW) {
1555         XSync(b->display, False);
1556         if (!window_exists( b->display, b->frontxrb->drawable )) {
1557            /* found a dead window, free the ancillary info */
1558            XMesaDestroyBuffer( b );
1559         }
1560      }
1561   }
1562}
1563
1564
1565unsigned long XMesaDitherColor( XMesaContext xmesa, GLint x, GLint y,
1566                                GLfloat red, GLfloat green,
1567                                GLfloat blue, GLfloat alpha )
1568{
1569   GLint r = (GLint) (red   * 255.0F);
1570   GLint g = (GLint) (green * 255.0F);
1571   GLint b = (GLint) (blue  * 255.0F);
1572   GLint a = (GLint) (alpha * 255.0F);
1573
1574   switch (xmesa->pixelformat) {
1575      case PF_Truecolor:
1576         {
1577            unsigned long p;
1578            PACK_TRUECOLOR( p, r, g, b );
1579            return p;
1580         }
1581      case PF_8A8B8G8R:
1582         return PACK_8A8B8G8R( r, g, b, a );
1583      case PF_8A8R8G8B:
1584         return PACK_8A8R8G8B( r, g, b, a );
1585      case PF_8R8G8B:
1586         return PACK_8R8G8B( r, g, b );
1587      case PF_5R6G5B:
1588         return PACK_5R6G5B( r, g, b );
1589      case PF_Dither_5R6G5B:
1590         /* fall through */
1591      case PF_Dither_True:
1592         {
1593            unsigned long p;
1594            PACK_TRUEDITHER(p, x, y, r, g, b);
1595            return p;
1596         }
1597      default:
1598         _mesa_problem(NULL, "Bad pixel format in XMesaDitherColor");
1599   }
1600   return 0;
1601}
1602
1603
1604/*
1605 * This is typically called when the window size changes and we need
1606 * to reallocate the buffer's back/depth/stencil/accum buffers.
1607 */
1608PUBLIC void
1609XMesaResizeBuffers( XMesaBuffer b )
1610{
1611   GET_CURRENT_CONTEXT(ctx);
1612   XMesaContext xmctx = XMESA_CONTEXT(ctx);
1613   if (!xmctx)
1614      return;
1615   xmesa_check_and_update_buffer_size(xmctx, b);
1616}
1617
1618
1619static GLint
1620xbuffer_to_renderbuffer(int buffer)
1621{
1622   assert(MAX_AUX_BUFFERS <= 4);
1623
1624   switch (buffer) {
1625   case GLX_FRONT_LEFT_EXT:
1626      return BUFFER_FRONT_LEFT;
1627   case GLX_FRONT_RIGHT_EXT:
1628      return BUFFER_FRONT_RIGHT;
1629   case GLX_BACK_LEFT_EXT:
1630      return BUFFER_BACK_LEFT;
1631   case GLX_BACK_RIGHT_EXT:
1632      return BUFFER_BACK_RIGHT;
1633   case GLX_AUX0_EXT:
1634      return BUFFER_AUX0;
1635   case GLX_AUX1_EXT:
1636   case GLX_AUX2_EXT:
1637   case GLX_AUX3_EXT:
1638   case GLX_AUX4_EXT:
1639   case GLX_AUX5_EXT:
1640   case GLX_AUX6_EXT:
1641   case GLX_AUX7_EXT:
1642   case GLX_AUX8_EXT:
1643   case GLX_AUX9_EXT:
1644   default:
1645      /* BadValue error */
1646      return -1;
1647   }
1648}
1649
1650
1651PUBLIC void
1652XMesaBindTexImage(XMesaDisplay *dpy, XMesaBuffer drawable, int buffer,
1653                  const int *attrib_list)
1654{
1655#if 0
1656   GET_CURRENT_CONTEXT(ctx);
1657   const GLuint unit = ctx->Texture.CurrentUnit;
1658   struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
1659   struct gl_texture_object *texObj;
1660#endif
1661   struct gl_renderbuffer *rb;
1662   struct xmesa_renderbuffer *xrb;
1663   GLint b;
1664   XMesaImage *img = NULL;
1665   GLboolean freeImg = GL_FALSE;
1666
1667   b = xbuffer_to_renderbuffer(buffer);
1668   if (b < 0)
1669      return;
1670
1671   if (drawable->TextureFormat == GLX_TEXTURE_FORMAT_NONE_EXT)
1672      return; /* BadMatch error */
1673
1674   rb = drawable->mesa_buffer.Attachment[b].Renderbuffer;
1675   if (!rb) {
1676      /* invalid buffer */
1677      return;
1678   }
1679   xrb = xmesa_renderbuffer(rb);
1680
1681#if 0
1682   switch (drawable->TextureTarget) {
1683   case GLX_TEXTURE_1D_EXT:
1684      texObj = texUnit->CurrentTex[TEXTURE_1D_INDEX];
1685      break;
1686   case GLX_TEXTURE_2D_EXT:
1687      texObj = texUnit->CurrentTex[TEXTURE_2D_INDEX];
1688      break;
1689   case GLX_TEXTURE_RECTANGLE_EXT:
1690      texObj = texUnit->CurrentTex[TEXTURE_RECT_INDEX];
1691      break;
1692   default:
1693      return; /* BadMatch error */
1694   }
1695#endif
1696
1697   /*
1698    * The following is a quick and simple way to implement
1699    * BindTexImage.  The better way is to write some new FetchTexel()
1700    * functions which would extract texels from XImages.  We'd still
1701    * need to use GetImage when texturing from a Pixmap (front buffer)
1702    * but texturing from a back buffer (XImage) would avoid an image
1703    * copy.
1704    */
1705
1706   /* get XImage */
1707   if (xrb->pixmap) {
1708      img = XMesaGetImage(dpy, xrb->pixmap, 0, 0, rb->Width, rb->Height, ~0L,
1709			  ZPixmap);
1710      freeImg = GL_TRUE;
1711   }
1712   else if (xrb->ximage) {
1713      img = xrb->ximage;
1714   }
1715
1716   /* store the XImage as a new texture image */
1717   if (img) {
1718      GLenum format, type, intFormat;
1719      if (img->bits_per_pixel == 32) {
1720         format = GL_BGRA;
1721         type = GL_UNSIGNED_BYTE;
1722         intFormat = GL_RGBA;
1723      }
1724      else if (img->bits_per_pixel == 24) {
1725         format = GL_BGR;
1726         type = GL_UNSIGNED_BYTE;
1727         intFormat = GL_RGB;
1728      }
1729      else if (img->bits_per_pixel == 16) {
1730         format = GL_BGR;
1731         type = GL_UNSIGNED_SHORT_5_6_5;
1732         intFormat = GL_RGB;
1733      }
1734      else {
1735         _mesa_problem(NULL, "Unexpected XImage format in XMesaBindTexImage");
1736         return;
1737      }
1738      if (drawable->TextureFormat == GLX_TEXTURE_FORMAT_RGBA_EXT) {
1739         intFormat = GL_RGBA;
1740      }
1741      else if (drawable->TextureFormat == GLX_TEXTURE_FORMAT_RGB_EXT) {
1742         intFormat = GL_RGB;
1743      }
1744
1745      _mesa_TexImage2D(GL_TEXTURE_2D, 0, intFormat, rb->Width, rb->Height, 0,
1746                       format, type, img->data);
1747
1748      if (freeImg) {
1749	 XMesaDestroyImage(img);
1750      }
1751   }
1752}
1753
1754
1755
1756PUBLIC void
1757XMesaReleaseTexImage(XMesaDisplay *dpy, XMesaBuffer drawable, int buffer)
1758{
1759   const GLint b = xbuffer_to_renderbuffer(buffer);
1760   if (b < 0)
1761      return;
1762
1763   /* no-op for now */
1764}
1765
1766