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