xm_api.c revision 7f41f5447c8f9113c8956901e1c5fff6081ecd94 
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.
52 *
53 */
54
55#ifdef __CYGWIN__
56#undef WIN32
57#undef __WIN32__
58#endif
59
60#include "xm_api.h"
61#include "main/context.h"
62#include "main/framebuffer.h"
63
64#include "state_tracker/st_public.h"
65#include "state_tracker/st_context.h"
66#include "pipe/p_defines.h"
67#include "pipe/p_screen.h"
68#include "pipe/p_context.h"
69
70#include "trace/tr_screen.h"
71#include "trace/tr_context.h"
72#include "trace/tr_texture.h"
73
74#include "xm_winsys.h"
75#include <GL/glx.h>
76
77
78/* Driver interface routines, set up by xlib backend on library
79 * _init().  These are global in the same way that function names are
80 * global.
81 */
82static struct xm_driver driver;
83
84void xmesa_set_driver( const struct xm_driver *templ )
85{
86   driver = *templ;
87}
88
89/**
90 * Global X driver lock
91 */
92pipe_mutex _xmesa_lock;
93
94static struct pipe_screen *_screen = NULL;
95static struct pipe_screen *screen = NULL;
96
97
98/**********************************************************************/
99/*****                     X Utility Functions                    *****/
100/**********************************************************************/
101
102
103/**
104 * Return the host's byte order as LSBFirst or MSBFirst ala X.
105 */
106static int host_byte_order( void )
107{
108   int i = 1;
109   char *cptr = (char *) &i;
110   return (*cptr==1) ? LSBFirst : MSBFirst;
111}
112
113
114/**
115 * Check if the X Shared Memory extension is available.
116 * Return:  0 = not available
117 *          1 = shared XImage support available
118 *          2 = shared Pixmap support available also
119 */
120int xmesa_check_for_xshm( Display *display )
121{
122#if defined(USE_XSHM)
123   int major, minor, ignore;
124   Bool pixmaps;
125
126   if (getenv("SP_NO_RAST"))
127      return 0;
128
129   if (getenv("MESA_NOSHM")) {
130      return 0;
131   }
132
133   if (XQueryExtension( display, "MIT-SHM", &ignore, &ignore, &ignore )) {
134      if (XShmQueryVersion( display, &major, &minor, &pixmaps )==True) {
135	 return (pixmaps==True) ? 2 : 1;
136      }
137      else {
138	 return 0;
139      }
140   }
141   else {
142      return 0;
143   }
144#else
145   /* No  XSHM support */
146   return 0;
147#endif
148}
149
150
151/**
152 * Return the true number of bits per pixel for XImages.
153 * For example, if we request a 24-bit deep visual we may actually need/get
154 * 32bpp XImages.  This function returns the appropriate bpp.
155 * Input:  dpy - the X display
156 *         visinfo - desribes the visual to be used for XImages
157 * Return:  true number of bits per pixel for XImages
158 */
159static int
160bits_per_pixel( XMesaVisual xmv )
161{
162   Display *dpy = xmv->display;
163   XVisualInfo * visinfo = xmv->visinfo;
164   XImage *img;
165   int bitsPerPixel;
166   /* Create a temporary XImage */
167   img = XCreateImage( dpy, visinfo->visual, visinfo->depth,
168		       ZPixmap, 0,           /*format, offset*/
169		       (char*) MALLOC(8),    /*data*/
170		       1, 1,                 /*width, height*/
171		       32,                   /*bitmap_pad*/
172		       0                     /*bytes_per_line*/
173                     );
174   assert(img);
175   /* grab the bits/pixel value */
176   bitsPerPixel = img->bits_per_pixel;
177   /* free the XImage */
178   _mesa_free( img->data );
179   img->data = NULL;
180   XDestroyImage( img );
181   return bitsPerPixel;
182}
183
184
185
186/*
187 * Determine if a given X window ID is valid (window exists).
188 * Do this by calling XGetWindowAttributes() for the window and
189 * checking if we catch an X error.
190 * Input:  dpy - the display
191 *         win - the window to check for existance
192 * Return:  GL_TRUE - window exists
193 *          GL_FALSE - window doesn't exist
194 */
195static GLboolean WindowExistsFlag;
196
197static int window_exists_err_handler( Display* dpy, XErrorEvent* xerr )
198{
199   (void) dpy;
200   if (xerr->error_code == BadWindow) {
201      WindowExistsFlag = GL_FALSE;
202   }
203   return 0;
204}
205
206static GLboolean window_exists( Display *dpy, Window win )
207{
208   XWindowAttributes wa;
209   int (*old_handler)( Display*, XErrorEvent* );
210   WindowExistsFlag = GL_TRUE;
211   old_handler = XSetErrorHandler(window_exists_err_handler);
212   XGetWindowAttributes( dpy, win, &wa ); /* dummy request */
213   XSetErrorHandler(old_handler);
214   return WindowExistsFlag;
215}
216
217static Status
218get_drawable_size( Display *dpy, Drawable d, uint *width, uint *height )
219{
220   Window root;
221   Status stat;
222   int xpos, ypos;
223   unsigned int w, h, bw, depth;
224   stat = XGetGeometry(dpy, d, &root, &xpos, &ypos, &w, &h, &bw, &depth);
225   *width = w;
226   *height = h;
227   return stat;
228}
229
230
231/**
232 * Return the size of the window (or pixmap) that corresponds to the
233 * given XMesaBuffer.
234 * \param width  returns width in pixels
235 * \param height  returns height in pixels
236 */
237void
238xmesa_get_window_size(Display *dpy, XMesaBuffer b,
239                      GLuint *width, GLuint *height)
240{
241   Status stat;
242
243   pipe_mutex_lock(_xmesa_lock);
244   XSync(b->xm_visual->display, 0); /* added for Chromium */
245   stat = get_drawable_size(dpy, b->drawable, width, height);
246   pipe_mutex_unlock(_xmesa_lock);
247
248   if (!stat) {
249      /* probably querying a window that's recently been destroyed */
250      _mesa_warning(NULL, "XGetGeometry failed!\n");
251      *width = *height = 1;
252   }
253}
254
255#define GET_REDMASK(__v)        __v->mesa_visual.redMask
256#define GET_GREENMASK(__v)      __v->mesa_visual.greenMask
257#define GET_BLUEMASK(__v)       __v->mesa_visual.blueMask
258
259
260/**
261 * Choose the pixel format for the given visual.
262 * This will tell the gallium driver how to pack pixel data into
263 * drawing surfaces.
264 */
265static GLuint
266choose_pixel_format(XMesaVisual v)
267{
268   boolean native_byte_order = (host_byte_order() ==
269                                ImageByteOrder(v->display));
270
271   if (   GET_REDMASK(v)   == 0x0000ff
272       && GET_GREENMASK(v) == 0x00ff00
273       && GET_BLUEMASK(v)  == 0xff0000
274       && v->BitsPerPixel == 32) {
275      if (native_byte_order) {
276         /* no byteswapping needed */
277         return 0 /* PIXEL_FORMAT_U_A8_B8_G8_R8 */;
278      }
279      else {
280         return PIPE_FORMAT_R8G8B8A8_UNORM;
281      }
282   }
283   else if (   GET_REDMASK(v)   == 0xff0000
284            && GET_GREENMASK(v) == 0x00ff00
285            && GET_BLUEMASK(v)  == 0x0000ff
286            && v->BitsPerPixel == 32) {
287      if (native_byte_order) {
288         /* no byteswapping needed */
289         return PIPE_FORMAT_A8R8G8B8_UNORM;
290      }
291      else {
292         return PIPE_FORMAT_B8G8R8A8_UNORM;
293      }
294   }
295   else if (   GET_REDMASK(v)   == 0x0000ff00
296            && GET_GREENMASK(v) == 0x00ff0000
297            && GET_BLUEMASK(v)  == 0xff000000
298            && v->BitsPerPixel == 32) {
299      if (native_byte_order) {
300         /* no byteswapping needed */
301         return PIPE_FORMAT_B8G8R8A8_UNORM;
302      }
303      else {
304         return PIPE_FORMAT_A8R8G8B8_UNORM;
305      }
306   }
307   else if (   GET_REDMASK(v)   == 0xf800
308            && GET_GREENMASK(v) == 0x07e0
309            && GET_BLUEMASK(v)  == 0x001f
310            && native_byte_order
311            && v->BitsPerPixel == 16) {
312      /* 5-6-5 RGB */
313      return PIPE_FORMAT_R5G6B5_UNORM;
314   }
315
316   assert(0);
317   return 0;
318}
319
320
321
322/**********************************************************************/
323/*****                Linked list of XMesaBuffers                 *****/
324/**********************************************************************/
325
326XMesaBuffer XMesaBufferList = NULL;
327
328
329/**
330 * Allocate a new XMesaBuffer object which corresponds to the given drawable.
331 * Note that XMesaBuffer is derived from GLframebuffer.
332 * The new XMesaBuffer will not have any size (Width=Height=0).
333 *
334 * \param d  the corresponding X drawable (window or pixmap)
335 * \param type  either WINDOW, PIXMAP or PBUFFER, describing d
336 * \param vis  the buffer's visual
337 * \param cmap  the window's colormap, if known.
338 * \return new XMesaBuffer or NULL if any problem
339 */
340static XMesaBuffer
341create_xmesa_buffer(Drawable d, BufferType type,
342                    XMesaVisual vis, Colormap cmap)
343{
344   XMesaBuffer b;
345   GLframebuffer *fb;
346   enum pipe_format colorFormat, depthFormat, stencilFormat;
347   uint width, height;
348
349   ASSERT(type == WINDOW || type == PIXMAP || type == PBUFFER);
350
351   b = (XMesaBuffer) CALLOC_STRUCT(xmesa_buffer);
352   if (!b)
353      return NULL;
354
355   b->drawable = d;
356
357   b->xm_visual = vis;
358   b->type = type;
359   b->cmap = cmap;
360
361   /* determine PIPE_FORMATs for buffers */
362   colorFormat = choose_pixel_format(vis);
363
364   if (vis->mesa_visual.depthBits == 0)
365      depthFormat = PIPE_FORMAT_NONE;
366#ifdef GALLIUM_CELL /* XXX temporary for Cell! */
367   else
368      depthFormat = PIPE_FORMAT_S8Z24_UNORM;
369#else
370   else if (vis->mesa_visual.depthBits <= 16)
371      depthFormat = PIPE_FORMAT_Z16_UNORM;
372   else if (vis->mesa_visual.depthBits <= 24)
373      depthFormat = PIPE_FORMAT_S8Z24_UNORM;
374   else
375      depthFormat = PIPE_FORMAT_Z32_UNORM;
376#endif
377
378   if (vis->mesa_visual.stencilBits == 8) {
379      if (depthFormat == PIPE_FORMAT_S8Z24_UNORM)
380         stencilFormat = depthFormat;
381      else
382         stencilFormat = PIPE_FORMAT_S8_UNORM;
383   }
384   else {
385      /* no stencil */
386      stencilFormat = PIPE_FORMAT_NONE;
387      if (depthFormat == PIPE_FORMAT_S8Z24_UNORM) {
388         /* use 24-bit Z, undefined stencil channel */
389         depthFormat = PIPE_FORMAT_X8Z24_UNORM;
390      }
391   }
392
393
394   get_drawable_size(vis->display, d, &width, &height);
395
396   /*
397    * Create framebuffer, but we'll plug in our own renderbuffers below.
398    */
399   b->stfb = st_create_framebuffer(&vis->mesa_visual,
400                                   colorFormat, depthFormat, stencilFormat,
401                                   width, height,
402                                   (void *) b);
403   fb = &b->stfb->Base;
404
405   /*
406    * Create scratch XImage for xmesa_display_surface()
407    */
408   b->tempImage = XCreateImage(vis->display,
409                               vis->visinfo->visual,
410                               vis->visinfo->depth,
411                               ZPixmap, 0,   /* format, offset */
412                               NULL,         /* data */
413                               0, 0,         /* size */
414                               32,           /* bitmap_pad */
415                               0);           /* bytes_per_line */
416
417   /* GLX_EXT_texture_from_pixmap */
418   b->TextureTarget = 0;
419   b->TextureFormat = GLX_TEXTURE_FORMAT_NONE_EXT;
420   b->TextureMipmap = 0;
421
422   /* insert buffer into linked list */
423   b->Next = XMesaBufferList;
424   XMesaBufferList = b;
425
426   return b;
427}
428
429
430/**
431 * Find an XMesaBuffer by matching X display and colormap but NOT matching
432 * the notThis buffer.
433 */
434XMesaBuffer
435xmesa_find_buffer(Display *dpy, Colormap cmap, XMesaBuffer notThis)
436{
437   XMesaBuffer b;
438   for (b = XMesaBufferList; b; b = b->Next) {
439      if (b->xm_visual->display == dpy &&
440          b->cmap == cmap &&
441          b != notThis) {
442         return b;
443      }
444   }
445   return NULL;
446}
447
448
449/**
450 * Remove buffer from linked list, delete if no longer referenced.
451 */
452static void
453xmesa_free_buffer(XMesaBuffer buffer)
454{
455   XMesaBuffer prev = NULL, b;
456
457   for (b = XMesaBufferList; b; b = b->Next) {
458      if (b == buffer) {
459         struct gl_framebuffer *fb = &buffer->stfb->Base;
460
461         /* unlink buffer from list */
462         if (prev)
463            prev->Next = buffer->Next;
464         else
465            XMesaBufferList = buffer->Next;
466
467         /* mark as delete pending */
468         fb->DeletePending = GL_TRUE;
469
470         /* Since the X window for the XMesaBuffer is going away, we don't
471          * want to dereference this pointer in the future.
472          */
473         b->drawable = 0;
474
475         buffer->tempImage->data = NULL;
476         XDestroyImage(buffer->tempImage);
477
478         /* Unreference.  If count = zero we'll really delete the buffer */
479         _mesa_reference_framebuffer(&fb, NULL);
480
481         XFreeGC(b->xm_visual->display, b->gc);
482
483         free(buffer);
484
485         return;
486      }
487      /* continue search */
488      prev = b;
489   }
490   /* buffer not found in XMesaBufferList */
491   _mesa_problem(NULL,"xmesa_free_buffer() - buffer not found\n");
492}
493
494
495
496/**********************************************************************/
497/*****                   Misc Private Functions                   *****/
498/**********************************************************************/
499
500
501/**
502 * When a context is bound for the first time, we can finally finish
503 * initializing the context's visual and buffer information.
504 * \param v  the XMesaVisual to initialize
505 * \param b  the XMesaBuffer to initialize (may be NULL)
506 * \param rgb_flag  TRUE = RGBA mode, FALSE = color index mode
507 * \param window  the window/pixmap we're rendering into
508 * \param cmap  the colormap associated with the window/pixmap
509 * \return GL_TRUE=success, GL_FALSE=failure
510 */
511static GLboolean
512initialize_visual_and_buffer(XMesaVisual v, XMesaBuffer b,
513                             GLboolean rgb_flag, Drawable window,
514                             Colormap cmap)
515{
516   ASSERT(!b || b->xm_visual == v);
517
518   /* Save true bits/pixel */
519   v->BitsPerPixel = bits_per_pixel(v);
520   assert(v->BitsPerPixel > 0);
521
522   if (rgb_flag == GL_FALSE) {
523      /* COLOR-INDEXED WINDOW: not supported*/
524      return GL_FALSE;
525   }
526   else {
527      /* RGB WINDOW:
528       * We support RGB rendering into almost any kind of visual.
529       */
530      const int xclass = v->mesa_visual.visualType;
531      if (xclass != GLX_TRUE_COLOR && xclass == !GLX_DIRECT_COLOR) {
532	 _mesa_warning(NULL,
533            "XMesa: RGB mode rendering not supported in given visual.\n");
534	 return GL_FALSE;
535      }
536      v->mesa_visual.indexBits = 0;
537
538      if (v->BitsPerPixel == 32) {
539         /* We use XImages for all front/back buffers.  If an X Window or
540          * X Pixmap is 32bpp, there's no guarantee that the alpha channel
541          * will be preserved.  For XImages we're in luck.
542          */
543         v->mesa_visual.alphaBits = 8;
544      }
545   }
546
547   /*
548    * If MESA_INFO env var is set print out some debugging info
549    * which can help Brian figure out what's going on when a user
550    * reports bugs.
551    */
552   if (_mesa_getenv("MESA_INFO")) {
553      _mesa_printf("X/Mesa visual = %p\n", (void *) v);
554      _mesa_printf("X/Mesa level = %d\n", v->mesa_visual.level);
555      _mesa_printf("X/Mesa depth = %d\n", v->visinfo->depth);
556      _mesa_printf("X/Mesa bits per pixel = %d\n", v->BitsPerPixel);
557   }
558
559   if (b && window) {
560      /* these should have been set in create_xmesa_buffer */
561      ASSERT(b->drawable == window);
562
563      /* Setup for single/double buffering */
564      if (v->mesa_visual.doubleBufferMode) {
565         /* Double buffered */
566         b->shm = xmesa_check_for_xshm( v->display );
567      }
568
569      /* X11 graphics context */
570      b->gc = XCreateGC( v->display, window, 0, NULL );
571      XSetFunction( v->display, b->gc, GXcopy );
572   }
573
574   return GL_TRUE;
575}
576
577
578
579#define NUM_VISUAL_TYPES   6
580
581/**
582 * Convert an X visual type to a GLX visual type.
583 *
584 * \param visualType X visual type (i.e., \c TrueColor, \c StaticGray, etc.)
585 *        to be converted.
586 * \return If \c visualType is a valid X visual type, a GLX visual type will
587 *         be returned.  Otherwise \c GLX_NONE will be returned.
588 *
589 * \note
590 * This code was lifted directly from lib/GL/glx/glcontextmodes.c in the
591 * DRI CVS tree.
592 */
593static GLint
594xmesa_convert_from_x_visual_type( int visualType )
595{
596    static const int glx_visual_types[ NUM_VISUAL_TYPES ] = {
597	GLX_STATIC_GRAY,  GLX_GRAY_SCALE,
598	GLX_STATIC_COLOR, GLX_PSEUDO_COLOR,
599	GLX_TRUE_COLOR,   GLX_DIRECT_COLOR
600    };
601
602    return ( (unsigned) visualType < NUM_VISUAL_TYPES )
603	? glx_visual_types[ visualType ] : GLX_NONE;
604}
605
606
607/**********************************************************************/
608/*****                       Public Functions                     *****/
609/**********************************************************************/
610
611
612/*
613 * Create a new X/Mesa visual.
614 * Input:  display - X11 display
615 *         visinfo - an XVisualInfo pointer
616 *         rgb_flag - GL_TRUE = RGB mode,
617 *                    GL_FALSE = color index mode
618 *         alpha_flag - alpha buffer requested?
619 *         db_flag - GL_TRUE = double-buffered,
620 *                   GL_FALSE = single buffered
621 *         stereo_flag - stereo visual?
622 *         ximage_flag - GL_TRUE = use an XImage for back buffer,
623 *                       GL_FALSE = use an off-screen pixmap for back buffer
624 *         depth_size - requested bits/depth values, or zero
625 *         stencil_size - requested bits/stencil values, or zero
626 *         accum_red_size - requested bits/red accum values, or zero
627 *         accum_green_size - requested bits/green accum values, or zero
628 *         accum_blue_size - requested bits/blue accum values, or zero
629 *         accum_alpha_size - requested bits/alpha accum values, or zero
630 *         num_samples - number of samples/pixel if multisampling, or zero
631 *         level - visual level, usually 0
632 *         visualCaveat - ala the GLX extension, usually GLX_NONE
633 * Return;  a new XMesaVisual or 0 if error.
634 */
635PUBLIC
636XMesaVisual XMesaCreateVisual( Display *display,
637                               XVisualInfo * visinfo,
638                               GLboolean rgb_flag,
639                               GLboolean alpha_flag,
640                               GLboolean db_flag,
641                               GLboolean stereo_flag,
642                               GLboolean ximage_flag,
643                               GLint depth_size,
644                               GLint stencil_size,
645                               GLint accum_red_size,
646                               GLint accum_green_size,
647                               GLint accum_blue_size,
648                               GLint accum_alpha_size,
649                               GLint num_samples,
650                               GLint level,
651                               GLint visualCaveat )
652{
653   XMesaVisual v;
654   GLint red_bits, green_bits, blue_bits, alpha_bits;
655
656   /* For debugging only */
657   if (_mesa_getenv("MESA_XSYNC")) {
658      /* This makes debugging X easier.
659       * In your debugger, set a breakpoint on _XError to stop when an
660       * X protocol error is generated.
661       */
662      XSynchronize( display, 1 );
663   }
664
665   v = (XMesaVisual) CALLOC_STRUCT(xmesa_visual);
666   if (!v) {
667      return NULL;
668   }
669
670   v->display = display;
671
672   /* Save a copy of the XVisualInfo struct because the user may X_mesa_free()
673    * the struct but we may need some of the information contained in it
674    * at a later time.
675    */
676   v->visinfo = (XVisualInfo *) MALLOC(sizeof(*visinfo));
677   if (!v->visinfo) {
678      _mesa_free(v);
679      return NULL;
680   }
681   MEMCPY(v->visinfo, visinfo, sizeof(*visinfo));
682
683   v->ximage_flag = ximage_flag;
684
685   v->mesa_visual.redMask = visinfo->red_mask;
686   v->mesa_visual.greenMask = visinfo->green_mask;
687   v->mesa_visual.blueMask = visinfo->blue_mask;
688   v->mesa_visual.visualID = visinfo->visualid;
689   v->mesa_visual.screen = visinfo->screen;
690
691#if !(defined(__cplusplus) || defined(c_plusplus))
692   v->mesa_visual.visualType = xmesa_convert_from_x_visual_type(visinfo->class);
693#else
694   v->mesa_visual.visualType = xmesa_convert_from_x_visual_type(visinfo->c_class);
695#endif
696
697   v->mesa_visual.visualRating = visualCaveat;
698
699   if (alpha_flag)
700      v->mesa_visual.alphaBits = 8;
701
702   (void) initialize_visual_and_buffer( v, NULL, rgb_flag, 0, 0 );
703
704   {
705      const int xclass = v->mesa_visual.visualType;
706      if (xclass == GLX_TRUE_COLOR || xclass == GLX_DIRECT_COLOR) {
707         red_bits   = _mesa_bitcount(GET_REDMASK(v));
708         green_bits = _mesa_bitcount(GET_GREENMASK(v));
709         blue_bits  = _mesa_bitcount(GET_BLUEMASK(v));
710      }
711      else {
712         /* this is an approximation */
713         int depth;
714         depth = v->visinfo->depth;
715         red_bits = depth / 3;
716         depth -= red_bits;
717         green_bits = depth / 2;
718         depth -= green_bits;
719         blue_bits = depth;
720         alpha_bits = 0;
721         assert( red_bits + green_bits + blue_bits == v->visinfo->depth );
722      }
723      alpha_bits = v->mesa_visual.alphaBits;
724   }
725
726   _mesa_initialize_visual( &v->mesa_visual,
727                            rgb_flag, db_flag, stereo_flag,
728                            red_bits, green_bits,
729                            blue_bits, alpha_bits,
730                            v->mesa_visual.indexBits,
731                            depth_size,
732                            stencil_size,
733                            accum_red_size, accum_green_size,
734                            accum_blue_size, accum_alpha_size,
735                            0 );
736
737   /* XXX minor hack */
738   v->mesa_visual.level = level;
739   return v;
740}
741
742
743PUBLIC
744void XMesaDestroyVisual( XMesaVisual v )
745{
746   _mesa_free(v->visinfo);
747   _mesa_free(v);
748}
749
750
751
752/**
753 * Create a new XMesaContext.
754 * \param v  the XMesaVisual
755 * \param share_list  another XMesaContext with which to share display
756 *                    lists or NULL if no sharing is wanted.
757 * \return an XMesaContext or NULL if error.
758 */
759PUBLIC
760XMesaContext XMesaCreateContext( XMesaVisual v, XMesaContext share_list )
761{
762   static GLboolean firstTime = GL_TRUE;
763   struct pipe_context *pipe = NULL;
764   XMesaContext c;
765   GLcontext *mesaCtx;
766   uint pf;
767
768   if (firstTime) {
769      pipe_mutex_init(_xmesa_lock);
770      _screen = driver.create_pipe_screen();
771      screen = trace_screen_create( _screen );
772      firstTime = GL_FALSE;
773   }
774
775   /* Note: the XMesaContext contains a Mesa GLcontext struct (inheritance) */
776   c = (XMesaContext) CALLOC_STRUCT(xmesa_context);
777   if (!c)
778      return NULL;
779
780   pf = choose_pixel_format(v);
781   assert(pf);
782
783   c->xm_visual = v;
784   c->xm_buffer = NULL;   /* set later by XMesaMakeCurrent */
785   c->xm_read_buffer = NULL;
786
787   if (screen == NULL)
788      goto fail;
789
790   /* Trace screen knows how to properly wrap context creation in the
791    * wrapped screen, so nothing special to do here:
792    */
793   pipe = screen->context_create(screen, (void *) c);
794   if (pipe == NULL)
795      goto fail;
796
797   c->st = st_create_context(pipe,
798                             &v->mesa_visual,
799                             share_list ? share_list->st : NULL);
800   if (c->st == NULL)
801      goto fail;
802
803   mesaCtx = c->st->ctx;
804   c->st->ctx->DriverCtx = c;
805
806   return c;
807
808fail:
809   if (c->st)
810      st_destroy_context(c->st);
811   else if (pipe)
812      pipe->destroy(pipe);
813
814   _mesa_free(c);
815   return NULL;
816}
817
818
819
820PUBLIC
821void XMesaDestroyContext( XMesaContext c )
822{
823   st_destroy_context(c->st);
824
825   /* FIXME: We should destroy the screen here, but if we do so, surfaces may
826    * outlive it, causing segfaults
827   struct pipe_screen *screen = c->st->pipe->screen;
828   screen->destroy(screen);
829   */
830
831   _mesa_free(c);
832}
833
834
835
836/**
837 * Private function for creating an XMesaBuffer which corresponds to an
838 * X window or pixmap.
839 * \param v  the window's XMesaVisual
840 * \param w  the window we're wrapping
841 * \return  new XMesaBuffer or NULL if error
842 */
843PUBLIC XMesaBuffer
844XMesaCreateWindowBuffer(XMesaVisual v, Window w)
845{
846   XWindowAttributes attr;
847   XMesaBuffer b;
848   Colormap cmap;
849   int depth;
850
851   assert(v);
852   assert(w);
853
854   /* Check that window depth matches visual depth */
855   XGetWindowAttributes( v->display, w, &attr );
856   depth = attr.depth;
857   if (v->visinfo->depth != depth) {
858      _mesa_warning(NULL, "XMesaCreateWindowBuffer: depth mismatch between visual (%d) and window (%d)!\n",
859                    v->visinfo->depth, depth);
860      return NULL;
861   }
862
863   /* Find colormap */
864   if (attr.colormap) {
865      cmap = attr.colormap;
866   }
867   else {
868      _mesa_warning(NULL, "Window %u has no colormap!\n", (unsigned int) w);
869      /* this is weird, a window w/out a colormap!? */
870      /* OK, let's just allocate a new one and hope for the best */
871      cmap = XCreateColormap(v->display, w, attr.visual, AllocNone);
872   }
873
874   b = create_xmesa_buffer((Drawable) w, WINDOW, v, cmap);
875   if (!b)
876      return NULL;
877
878   if (!initialize_visual_and_buffer( v, b, v->mesa_visual.rgbMode,
879                                      (Drawable) w, cmap )) {
880      xmesa_free_buffer(b);
881      return NULL;
882   }
883
884   return b;
885}
886
887
888
889/**
890 * Create a new XMesaBuffer from an X pixmap.
891 *
892 * \param v    the XMesaVisual
893 * \param p    the pixmap
894 * \param cmap the colormap, may be 0 if using a \c GLX_TRUE_COLOR or
895 *             \c GLX_DIRECT_COLOR visual for the pixmap
896 * \returns new XMesaBuffer or NULL if error
897 */
898PUBLIC XMesaBuffer
899XMesaCreatePixmapBuffer(XMesaVisual v, Pixmap p, Colormap cmap)
900{
901   XMesaBuffer b;
902
903   assert(v);
904
905   b = create_xmesa_buffer((Drawable) p, PIXMAP, v, cmap);
906   if (!b)
907      return NULL;
908
909   if (!initialize_visual_and_buffer(v, b, v->mesa_visual.rgbMode,
910				     (Drawable) p, cmap)) {
911      xmesa_free_buffer(b);
912      return NULL;
913   }
914
915   return b;
916}
917
918
919/**
920 * For GLX_EXT_texture_from_pixmap
921 */
922XMesaBuffer
923XMesaCreatePixmapTextureBuffer(XMesaVisual v, Pixmap p,
924                               Colormap cmap,
925                               int format, int target, int mipmap)
926{
927   GET_CURRENT_CONTEXT(ctx);
928   XMesaBuffer b;
929   GLuint width, height;
930
931   assert(v);
932
933   b = create_xmesa_buffer((Drawable) p, PIXMAP, v, cmap);
934   if (!b)
935      return NULL;
936
937   /* get pixmap size, update framebuffer/renderbuffer dims */
938   xmesa_get_window_size(v->display, b, &width, &height);
939   _mesa_resize_framebuffer(NULL, &(b->stfb->Base), width, height);
940
941   if (target == 0) {
942      /* examine dims */
943      if (ctx->Extensions.ARB_texture_non_power_of_two) {
944         target = GLX_TEXTURE_2D_EXT;
945      }
946      else if (   _mesa_bitcount(width)  == 1
947               && _mesa_bitcount(height) == 1) {
948         /* power of two size */
949         if (height == 1) {
950            target = GLX_TEXTURE_1D_EXT;
951         }
952         else {
953            target = GLX_TEXTURE_2D_EXT;
954         }
955      }
956      else if (ctx->Extensions.NV_texture_rectangle) {
957         target = GLX_TEXTURE_RECTANGLE_EXT;
958      }
959      else {
960         /* non power of two textures not supported */
961         XMesaDestroyBuffer(b);
962         return 0;
963      }
964   }
965
966   b->TextureTarget = target;
967   b->TextureFormat = format;
968   b->TextureMipmap = mipmap;
969
970   if (!initialize_visual_and_buffer(v, b, v->mesa_visual.rgbMode,
971				     (Drawable) p, cmap)) {
972      xmesa_free_buffer(b);
973      return NULL;
974   }
975
976   return b;
977}
978
979
980
981XMesaBuffer
982XMesaCreatePBuffer(XMesaVisual v, Colormap cmap,
983                   unsigned int width, unsigned int height)
984{
985   Window root;
986   Drawable drawable;  /* X Pixmap Drawable */
987   XMesaBuffer b;
988
989   /* allocate pixmap for front buffer */
990   root = RootWindow( v->display, v->visinfo->screen );
991   drawable = XCreatePixmap(v->display, root, width, height,
992                            v->visinfo->depth);
993   if (!drawable)
994      return NULL;
995
996   b = create_xmesa_buffer(drawable, PBUFFER, v, cmap);
997   if (!b)
998      return NULL;
999
1000   if (!initialize_visual_and_buffer(v, b, v->mesa_visual.rgbMode,
1001				     drawable, cmap)) {
1002      xmesa_free_buffer(b);
1003      return NULL;
1004   }
1005
1006   return b;
1007}
1008
1009
1010
1011/*
1012 * Deallocate an XMesaBuffer structure and all related info.
1013 */
1014PUBLIC void
1015XMesaDestroyBuffer(XMesaBuffer b)
1016{
1017   xmesa_free_buffer(b);
1018}
1019
1020
1021/**
1022 * Query the current window size and update the corresponding GLframebuffer
1023 * and all attached renderbuffers.
1024 * Called when:
1025 *  1. the first time a buffer is bound to a context.
1026 *  2. SwapBuffers.  XXX probabaly from xm_flush_frontbuffer() too...
1027 * Note: it's possible (and legal) for xmctx to be NULL.  That can happen
1028 * when resizing a buffer when no rendering context is bound.
1029 */
1030void
1031xmesa_check_and_update_buffer_size(XMesaContext xmctx, XMesaBuffer drawBuffer)
1032{
1033   GLuint width, height;
1034   xmesa_get_window_size(drawBuffer->xm_visual->display, drawBuffer, &width, &height);
1035   st_resize_framebuffer(drawBuffer->stfb, width, height);
1036}
1037
1038
1039
1040
1041/*
1042 * Bind buffer b to context c and make c the current rendering context.
1043 */
1044PUBLIC
1045GLboolean XMesaMakeCurrent2( XMesaContext c, XMesaBuffer drawBuffer,
1046                             XMesaBuffer readBuffer )
1047{
1048   XMesaContext old_ctx = XMesaGetCurrentContext();
1049
1050   if (old_ctx && old_ctx != c) {
1051      XMesaFlush(old_ctx);
1052      old_ctx->xm_buffer = NULL;
1053      old_ctx->xm_read_buffer = NULL;
1054   }
1055
1056   if (c) {
1057      if (!drawBuffer || !readBuffer)
1058         return GL_FALSE;  /* must specify buffers! */
1059
1060      if (c == old_ctx &&
1061	  c->xm_buffer == drawBuffer &&
1062	  c->xm_read_buffer == readBuffer)
1063	 return GL_TRUE;
1064
1065      c->xm_buffer = drawBuffer;
1066      c->xm_read_buffer = readBuffer;
1067
1068      st_make_current(c->st, drawBuffer->stfb, readBuffer->stfb);
1069
1070      xmesa_check_and_update_buffer_size(c, drawBuffer);
1071      if (readBuffer != drawBuffer)
1072         xmesa_check_and_update_buffer_size(c, readBuffer);
1073
1074      /* Solution to Stephane Rehel's problem with glXReleaseBuffersMESA(): */
1075      drawBuffer->wasCurrent = GL_TRUE;
1076   }
1077   else {
1078      /* Detach */
1079      st_make_current( NULL, NULL, NULL );
1080
1081   }
1082   return GL_TRUE;
1083}
1084
1085
1086/*
1087 * Unbind the context c from its buffer.
1088 */
1089GLboolean XMesaUnbindContext( XMesaContext c )
1090{
1091   /* A no-op for XFree86 integration purposes */
1092   return GL_TRUE;
1093}
1094
1095
1096XMesaContext XMesaGetCurrentContext( void )
1097{
1098   GET_CURRENT_CONTEXT(ctx);
1099   if (ctx) {
1100      XMesaContext xmesa = xmesa_context(ctx);
1101      return xmesa;
1102   }
1103   else {
1104      return 0;
1105   }
1106}
1107
1108
1109
1110/**
1111 * Swap front and back color buffers and have winsys display front buffer.
1112 * If there's no front color buffer no swap actually occurs.
1113 */
1114PUBLIC
1115void XMesaSwapBuffers( XMesaBuffer b )
1116{
1117   struct pipe_surface *frontLeftSurf;
1118
1119   st_swapbuffers(b->stfb, &frontLeftSurf, NULL);
1120
1121   if (frontLeftSurf) {
1122      if (_screen != screen) {
1123         struct trace_surface *tr_surf = trace_surface( frontLeftSurf );
1124         struct pipe_surface *surf = tr_surf->surface;
1125         frontLeftSurf = surf;
1126      }
1127
1128      driver.display_surface(b, frontLeftSurf);
1129   }
1130
1131   xmesa_check_and_update_buffer_size(NULL, b);
1132}
1133
1134
1135
1136/*
1137 * Copy sub-region of back buffer to front buffer
1138 */
1139void XMesaCopySubBuffer( XMesaBuffer b, int x, int y, int width, int height )
1140{
1141   struct pipe_surface *surf_front;
1142   struct pipe_surface *surf_back;
1143   struct pipe_context *pipe = NULL; /* XXX fix */
1144
1145   st_get_framebuffer_surface(b->stfb, ST_SURFACE_FRONT_LEFT, &surf_front);
1146   st_get_framebuffer_surface(b->stfb, ST_SURFACE_BACK_LEFT, &surf_back);
1147
1148   if (!surf_front || !surf_back)
1149      return;
1150
1151   pipe->surface_copy(pipe,
1152                      surf_front, x, y,  /* dest */
1153                      surf_back, x, y,   /* src */
1154                      width, height);
1155}
1156
1157
1158
1159void XMesaFlush( XMesaContext c )
1160{
1161   if (c && c->xm_visual->display) {
1162      st_finish(c->st);
1163      XSync( c->xm_visual->display, False );
1164   }
1165}
1166
1167
1168
1169
1170
1171XMesaBuffer XMesaFindBuffer( Display *dpy, Drawable d )
1172{
1173   XMesaBuffer b;
1174   for (b = XMesaBufferList; b; b = b->Next) {
1175      if (b->drawable == d && b->xm_visual->display == dpy) {
1176         return b;
1177      }
1178   }
1179   return NULL;
1180}
1181
1182
1183/**
1184 * Free/destroy all XMesaBuffers associated with given display.
1185 */
1186void xmesa_destroy_buffers_on_display(Display *dpy)
1187{
1188   XMesaBuffer b, next;
1189   for (b = XMesaBufferList; b; b = next) {
1190      next = b->Next;
1191      if (b->xm_visual->display == dpy) {
1192         xmesa_free_buffer(b);
1193      }
1194   }
1195}
1196
1197
1198/*
1199 * Look for XMesaBuffers whose X window has been destroyed.
1200 * Deallocate any such XMesaBuffers.
1201 */
1202void XMesaGarbageCollect( void )
1203{
1204   XMesaBuffer b, next;
1205   for (b=XMesaBufferList; b; b=next) {
1206      next = b->Next;
1207      if (b->xm_visual &&
1208          b->xm_visual->display &&
1209          b->drawable &&
1210          b->type == WINDOW) {
1211         XSync(b->xm_visual->display, False);
1212         if (!window_exists( b->xm_visual->display, b->drawable )) {
1213            /* found a dead window, free the ancillary info */
1214            XMesaDestroyBuffer( b );
1215         }
1216      }
1217   }
1218}
1219
1220
1221
1222
1223PUBLIC void
1224XMesaBindTexImage(Display *dpy, XMesaBuffer drawable, int buffer,
1225                  const int *attrib_list)
1226{
1227}
1228
1229
1230
1231PUBLIC void
1232XMesaReleaseTexImage(Display *dpy, XMesaBuffer drawable, int buffer)
1233{
1234}
1235
1236