xm_api.c revision 0526100a5cbd928fa28d38abdafd6beb024b0828 
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 "xm_winsys.h"
71#include <GL/glx.h>
72
73
74/* Driver interface routines, set up by xlib backend on library
75 * _init().  These are global in the same way that function names are
76 * global.
77 */
78static struct xm_driver driver;
79
80void xmesa_set_driver( const struct xm_driver *templ )
81{
82   driver = *templ;
83}
84
85/**
86 * Global X driver lock
87 */
88pipe_mutex _xmesa_lock;
89
90
91
92/**********************************************************************/
93/*****                     X Utility Functions                    *****/
94/**********************************************************************/
95
96
97/**
98 * Return the host's byte order as LSBFirst or MSBFirst ala X.
99 */
100static int host_byte_order( void )
101{
102   int i = 1;
103   char *cptr = (char *) &i;
104   return (*cptr==1) ? LSBFirst : MSBFirst;
105}
106
107
108/**
109 * Check if the X Shared Memory extension is available.
110 * Return:  0 = not available
111 *          1 = shared XImage support available
112 *          2 = shared Pixmap support available also
113 */
114int xmesa_check_for_xshm( Display *display )
115{
116#if defined(USE_XSHM)
117   int major, minor, ignore;
118   Bool pixmaps;
119
120   if (getenv("SP_NO_RAST"))
121      return 0;
122
123   if (getenv("MESA_NOSHM")) {
124      return 0;
125   }
126
127   if (XQueryExtension( display, "MIT-SHM", &ignore, &ignore, &ignore )) {
128      if (XShmQueryVersion( display, &major, &minor, &pixmaps )==True) {
129	 return (pixmaps==True) ? 2 : 1;
130      }
131      else {
132	 return 0;
133      }
134   }
135   else {
136      return 0;
137   }
138#else
139   /* No  XSHM support */
140   return 0;
141#endif
142}
143
144
145/**
146 * Return the true number of bits per pixel for XImages.
147 * For example, if we request a 24-bit deep visual we may actually need/get
148 * 32bpp XImages.  This function returns the appropriate bpp.
149 * Input:  dpy - the X display
150 *         visinfo - desribes the visual to be used for XImages
151 * Return:  true number of bits per pixel for XImages
152 */
153static int
154bits_per_pixel( XMesaVisual xmv )
155{
156   Display *dpy = xmv->display;
157   XVisualInfo * visinfo = xmv->visinfo;
158   XImage *img;
159   int bitsPerPixel;
160   /* Create a temporary XImage */
161   img = XCreateImage( dpy, visinfo->visual, visinfo->depth,
162		       ZPixmap, 0,           /*format, offset*/
163		       (char*) MALLOC(8),    /*data*/
164		       1, 1,                 /*width, height*/
165		       32,                   /*bitmap_pad*/
166		       0                     /*bytes_per_line*/
167                     );
168   assert(img);
169   /* grab the bits/pixel value */
170   bitsPerPixel = img->bits_per_pixel;
171   /* free the XImage */
172   _mesa_free( img->data );
173   img->data = NULL;
174   XDestroyImage( img );
175   return bitsPerPixel;
176}
177
178
179
180/*
181 * Determine if a given X window ID is valid (window exists).
182 * Do this by calling XGetWindowAttributes() for the window and
183 * checking if we catch an X error.
184 * Input:  dpy - the display
185 *         win - the window to check for existance
186 * Return:  GL_TRUE - window exists
187 *          GL_FALSE - window doesn't exist
188 */
189static GLboolean WindowExistsFlag;
190
191static int window_exists_err_handler( Display* dpy, XErrorEvent* xerr )
192{
193   (void) dpy;
194   if (xerr->error_code == BadWindow) {
195      WindowExistsFlag = GL_FALSE;
196   }
197   return 0;
198}
199
200static GLboolean window_exists( Display *dpy, Window win )
201{
202   XWindowAttributes wa;
203   int (*old_handler)( Display*, XErrorEvent* );
204   WindowExistsFlag = GL_TRUE;
205   old_handler = XSetErrorHandler(window_exists_err_handler);
206   XGetWindowAttributes( dpy, win, &wa ); /* dummy request */
207   XSetErrorHandler(old_handler);
208   return WindowExistsFlag;
209}
210
211static Status
212get_drawable_size( Display *dpy, Drawable d, uint *width, uint *height )
213{
214   Window root;
215   Status stat;
216   int xpos, ypos;
217   unsigned int w, h, bw, depth;
218   stat = XGetGeometry(dpy, d, &root, &xpos, &ypos, &w, &h, &bw, &depth);
219   *width = w;
220   *height = h;
221   return stat;
222}
223
224
225/**
226 * Return the size of the window (or pixmap) that corresponds to the
227 * given XMesaBuffer.
228 * \param width  returns width in pixels
229 * \param height  returns height in pixels
230 */
231void
232xmesa_get_window_size(Display *dpy, XMesaBuffer b,
233                      GLuint *width, GLuint *height)
234{
235   Status stat;
236
237   pipe_mutex_lock(_xmesa_lock);
238   XSync(b->xm_visual->display, 0); /* added for Chromium */
239   stat = get_drawable_size(dpy, b->drawable, width, height);
240   pipe_mutex_unlock(_xmesa_lock);
241
242   if (!stat) {
243      /* probably querying a window that's recently been destroyed */
244      _mesa_warning(NULL, "XGetGeometry failed!\n");
245      *width = *height = 1;
246   }
247}
248
249#define GET_REDMASK(__v)        __v->mesa_visual.redMask
250#define GET_GREENMASK(__v)      __v->mesa_visual.greenMask
251#define GET_BLUEMASK(__v)       __v->mesa_visual.blueMask
252
253
254/**
255 * Choose the pixel format for the given visual.
256 * This will tell the gallium driver how to pack pixel data into
257 * drawing surfaces.
258 */
259static GLuint
260choose_pixel_format(XMesaVisual v)
261{
262   boolean native_byte_order = (host_byte_order() ==
263                                ImageByteOrder(v->display));
264
265   if (   GET_REDMASK(v)   == 0x0000ff
266       && GET_GREENMASK(v) == 0x00ff00
267       && GET_BLUEMASK(v)  == 0xff0000
268       && v->BitsPerPixel == 32) {
269      if (native_byte_order) {
270         /* no byteswapping needed */
271         return 0 /* PIXEL_FORMAT_U_A8_B8_G8_R8 */;
272      }
273      else {
274         return PIPE_FORMAT_R8G8B8A8_UNORM;
275      }
276   }
277   else if (   GET_REDMASK(v)   == 0xff0000
278            && GET_GREENMASK(v) == 0x00ff00
279            && GET_BLUEMASK(v)  == 0x0000ff
280            && v->BitsPerPixel == 32) {
281      if (native_byte_order) {
282         /* no byteswapping needed */
283         return PIPE_FORMAT_A8R8G8B8_UNORM;
284      }
285      else {
286         return PIPE_FORMAT_B8G8R8A8_UNORM;
287      }
288   }
289   else if (   GET_REDMASK(v)   == 0x0000ff00
290            && GET_GREENMASK(v) == 0x00ff0000
291            && GET_BLUEMASK(v)  == 0xff000000
292            && v->BitsPerPixel == 32) {
293      if (native_byte_order) {
294         /* no byteswapping needed */
295         return PIPE_FORMAT_B8G8R8A8_UNORM;
296      }
297      else {
298         return PIPE_FORMAT_A8R8G8B8_UNORM;
299      }
300   }
301   else if (   GET_REDMASK(v)   == 0xf800
302            && GET_GREENMASK(v) == 0x07e0
303            && GET_BLUEMASK(v)  == 0x001f
304            && native_byte_order
305            && v->BitsPerPixel == 16) {
306      /* 5-6-5 RGB */
307      return PIPE_FORMAT_R5G6B5_UNORM;
308   }
309
310   assert(0);
311   return 0;
312}
313
314
315
316/**********************************************************************/
317/*****                Linked list of XMesaBuffers                 *****/
318/**********************************************************************/
319
320XMesaBuffer XMesaBufferList = NULL;
321
322
323/**
324 * Allocate a new XMesaBuffer object which corresponds to the given drawable.
325 * Note that XMesaBuffer is derived from GLframebuffer.
326 * The new XMesaBuffer will not have any size (Width=Height=0).
327 *
328 * \param d  the corresponding X drawable (window or pixmap)
329 * \param type  either WINDOW, PIXMAP or PBUFFER, describing d
330 * \param vis  the buffer's visual
331 * \param cmap  the window's colormap, if known.
332 * \return new XMesaBuffer or NULL if any problem
333 */
334static XMesaBuffer
335create_xmesa_buffer(Drawable d, BufferType type,
336                    XMesaVisual vis, Colormap cmap)
337{
338   XMesaBuffer b;
339   GLframebuffer *fb;
340   enum pipe_format colorFormat, depthFormat, stencilFormat;
341   uint width, height;
342
343   ASSERT(type == WINDOW || type == PIXMAP || type == PBUFFER);
344
345   b = (XMesaBuffer) CALLOC_STRUCT(xmesa_buffer);
346   if (!b)
347      return NULL;
348
349   b->drawable = d;
350
351   b->xm_visual = vis;
352   b->type = type;
353   b->cmap = cmap;
354
355   /* determine PIPE_FORMATs for buffers */
356   colorFormat = choose_pixel_format(vis);
357
358   if (vis->mesa_visual.depthBits == 0)
359      depthFormat = PIPE_FORMAT_NONE;
360#ifdef GALLIUM_CELL /* XXX temporary for Cell! */
361   else
362      depthFormat = PIPE_FORMAT_S8Z24_UNORM;
363#else
364   else if (vis->mesa_visual.depthBits <= 16)
365      depthFormat = PIPE_FORMAT_Z16_UNORM;
366   else if (vis->mesa_visual.depthBits <= 24)
367      depthFormat = PIPE_FORMAT_S8Z24_UNORM;
368   else
369      depthFormat = PIPE_FORMAT_Z32_UNORM;
370#endif
371
372   if (vis->mesa_visual.stencilBits == 8) {
373      if (depthFormat == PIPE_FORMAT_S8Z24_UNORM)
374         stencilFormat = depthFormat;
375      else
376         stencilFormat = PIPE_FORMAT_S8_UNORM;
377   }
378   else {
379      /* no stencil */
380      stencilFormat = PIPE_FORMAT_NONE;
381      if (depthFormat == PIPE_FORMAT_S8Z24_UNORM) {
382         /* use 24-bit Z, undefined stencil channel */
383         depthFormat = PIPE_FORMAT_X8Z24_UNORM;
384      }
385   }
386
387
388   get_drawable_size(vis->display, d, &width, &height);
389
390   /*
391    * Create framebuffer, but we'll plug in our own renderbuffers below.
392    */
393   b->stfb = st_create_framebuffer(&vis->mesa_visual,
394                                   colorFormat, depthFormat, stencilFormat,
395                                   width, height,
396                                   (void *) b);
397   fb = &b->stfb->Base;
398
399   /*
400    * Create scratch XImage for xmesa_display_surface()
401    */
402   b->tempImage = XCreateImage(vis->display,
403                               vis->visinfo->visual,
404                               vis->visinfo->depth,
405                               ZPixmap, 0,   /* format, offset */
406                               NULL,         /* data */
407                               0, 0,         /* size */
408                               32,           /* bitmap_pad */
409                               0);           /* bytes_per_line */
410
411   /* GLX_EXT_texture_from_pixmap */
412   b->TextureTarget = 0;
413   b->TextureFormat = GLX_TEXTURE_FORMAT_NONE_EXT;
414   b->TextureMipmap = 0;
415
416   /* insert buffer into linked list */
417   b->Next = XMesaBufferList;
418   XMesaBufferList = b;
419
420   return b;
421}
422
423
424/**
425 * Find an XMesaBuffer by matching X display and colormap but NOT matching
426 * the notThis buffer.
427 */
428XMesaBuffer
429xmesa_find_buffer(Display *dpy, Colormap cmap, XMesaBuffer notThis)
430{
431   XMesaBuffer b;
432   for (b = XMesaBufferList; b; b = b->Next) {
433      if (b->xm_visual->display == dpy &&
434          b->cmap == cmap &&
435          b != notThis) {
436         return b;
437      }
438   }
439   return NULL;
440}
441
442
443/**
444 * Remove buffer from linked list, delete if no longer referenced.
445 */
446static void
447xmesa_free_buffer(XMesaBuffer buffer)
448{
449   XMesaBuffer prev = NULL, b;
450
451   for (b = XMesaBufferList; b; b = b->Next) {
452      if (b == buffer) {
453         struct gl_framebuffer *fb = &buffer->stfb->Base;
454
455         /* unlink buffer from list */
456         if (prev)
457            prev->Next = buffer->Next;
458         else
459            XMesaBufferList = buffer->Next;
460
461         /* mark as delete pending */
462         fb->DeletePending = GL_TRUE;
463
464         /* Since the X window for the XMesaBuffer is going away, we don't
465          * want to dereference this pointer in the future.
466          */
467         b->drawable = 0;
468
469         buffer->tempImage->data = NULL;
470         XDestroyImage(buffer->tempImage);
471
472         /* Unreference.  If count = zero we'll really delete the buffer */
473         _mesa_reference_framebuffer(&fb, NULL);
474
475         XFreeGC(b->xm_visual->display, b->gc);
476
477         free(buffer);
478
479         return;
480      }
481      /* continue search */
482      prev = b;
483   }
484   /* buffer not found in XMesaBufferList */
485   _mesa_problem(NULL,"xmesa_free_buffer() - buffer not found\n");
486}
487
488
489
490/**********************************************************************/
491/*****                   Misc Private Functions                   *****/
492/**********************************************************************/
493
494
495/**
496 * When a context is bound for the first time, we can finally finish
497 * initializing the context's visual and buffer information.
498 * \param v  the XMesaVisual to initialize
499 * \param b  the XMesaBuffer to initialize (may be NULL)
500 * \param rgb_flag  TRUE = RGBA mode, FALSE = color index mode
501 * \param window  the window/pixmap we're rendering into
502 * \param cmap  the colormap associated with the window/pixmap
503 * \return GL_TRUE=success, GL_FALSE=failure
504 */
505static GLboolean
506initialize_visual_and_buffer(XMesaVisual v, XMesaBuffer b,
507                             GLboolean rgb_flag, Drawable window,
508                             Colormap cmap)
509{
510   ASSERT(!b || b->xm_visual == v);
511
512   /* Save true bits/pixel */
513   v->BitsPerPixel = bits_per_pixel(v);
514   assert(v->BitsPerPixel > 0);
515
516   if (rgb_flag == GL_FALSE) {
517      /* COLOR-INDEXED WINDOW: not supported*/
518      return GL_FALSE;
519   }
520   else {
521      /* RGB WINDOW:
522       * We support RGB rendering into almost any kind of visual.
523       */
524      const int xclass = v->mesa_visual.visualType;
525      if (xclass != GLX_TRUE_COLOR && xclass == !GLX_DIRECT_COLOR) {
526	 _mesa_warning(NULL,
527            "XMesa: RGB mode rendering not supported in given visual.\n");
528	 return GL_FALSE;
529      }
530      v->mesa_visual.indexBits = 0;
531
532      if (v->BitsPerPixel == 32) {
533         /* We use XImages for all front/back buffers.  If an X Window or
534          * X Pixmap is 32bpp, there's no guarantee that the alpha channel
535          * will be preserved.  For XImages we're in luck.
536          */
537         v->mesa_visual.alphaBits = 8;
538      }
539   }
540
541   /*
542    * If MESA_INFO env var is set print out some debugging info
543    * which can help Brian figure out what's going on when a user
544    * reports bugs.
545    */
546   if (_mesa_getenv("MESA_INFO")) {
547      _mesa_printf("X/Mesa visual = %p\n", (void *) v);
548      _mesa_printf("X/Mesa level = %d\n", v->mesa_visual.level);
549      _mesa_printf("X/Mesa depth = %d\n", v->visinfo->depth);
550      _mesa_printf("X/Mesa bits per pixel = %d\n", v->BitsPerPixel);
551   }
552
553   if (b && window) {
554      /* these should have been set in create_xmesa_buffer */
555      ASSERT(b->drawable == window);
556
557      /* Setup for single/double buffering */
558      if (v->mesa_visual.doubleBufferMode) {
559         /* Double buffered */
560         b->shm = xmesa_check_for_xshm( v->display );
561      }
562
563      /* X11 graphics context */
564      b->gc = XCreateGC( v->display, window, 0, NULL );
565      XSetFunction( v->display, b->gc, GXcopy );
566   }
567
568   return GL_TRUE;
569}
570
571
572
573#define NUM_VISUAL_TYPES   6
574
575/**
576 * Convert an X visual type to a GLX visual type.
577 *
578 * \param visualType X visual type (i.e., \c TrueColor, \c StaticGray, etc.)
579 *        to be converted.
580 * \return If \c visualType is a valid X visual type, a GLX visual type will
581 *         be returned.  Otherwise \c GLX_NONE will be returned.
582 *
583 * \note
584 * This code was lifted directly from lib/GL/glx/glcontextmodes.c in the
585 * DRI CVS tree.
586 */
587static GLint
588xmesa_convert_from_x_visual_type( int visualType )
589{
590    static const int glx_visual_types[ NUM_VISUAL_TYPES ] = {
591	GLX_STATIC_GRAY,  GLX_GRAY_SCALE,
592	GLX_STATIC_COLOR, GLX_PSEUDO_COLOR,
593	GLX_TRUE_COLOR,   GLX_DIRECT_COLOR
594    };
595
596    return ( (unsigned) visualType < NUM_VISUAL_TYPES )
597	? glx_visual_types[ visualType ] : GLX_NONE;
598}
599
600
601/**********************************************************************/
602/*****                       Public Functions                     *****/
603/**********************************************************************/
604
605
606/*
607 * Create a new X/Mesa visual.
608 * Input:  display - X11 display
609 *         visinfo - an XVisualInfo pointer
610 *         rgb_flag - GL_TRUE = RGB mode,
611 *                    GL_FALSE = color index mode
612 *         alpha_flag - alpha buffer requested?
613 *         db_flag - GL_TRUE = double-buffered,
614 *                   GL_FALSE = single buffered
615 *         stereo_flag - stereo visual?
616 *         ximage_flag - GL_TRUE = use an XImage for back buffer,
617 *                       GL_FALSE = use an off-screen pixmap for back buffer
618 *         depth_size - requested bits/depth values, or zero
619 *         stencil_size - requested bits/stencil values, or zero
620 *         accum_red_size - requested bits/red accum values, or zero
621 *         accum_green_size - requested bits/green accum values, or zero
622 *         accum_blue_size - requested bits/blue accum values, or zero
623 *         accum_alpha_size - requested bits/alpha accum values, or zero
624 *         num_samples - number of samples/pixel if multisampling, or zero
625 *         level - visual level, usually 0
626 *         visualCaveat - ala the GLX extension, usually GLX_NONE
627 * Return;  a new XMesaVisual or 0 if error.
628 */
629PUBLIC
630XMesaVisual XMesaCreateVisual( Display *display,
631                               XVisualInfo * visinfo,
632                               GLboolean rgb_flag,
633                               GLboolean alpha_flag,
634                               GLboolean db_flag,
635                               GLboolean stereo_flag,
636                               GLboolean ximage_flag,
637                               GLint depth_size,
638                               GLint stencil_size,
639                               GLint accum_red_size,
640                               GLint accum_green_size,
641                               GLint accum_blue_size,
642                               GLint accum_alpha_size,
643                               GLint num_samples,
644                               GLint level,
645                               GLint visualCaveat )
646{
647   XMesaVisual v;
648   GLint red_bits, green_bits, blue_bits, alpha_bits;
649
650   /* For debugging only */
651   if (_mesa_getenv("MESA_XSYNC")) {
652      /* This makes debugging X easier.
653       * In your debugger, set a breakpoint on _XError to stop when an
654       * X protocol error is generated.
655       */
656      XSynchronize( display, 1 );
657   }
658
659   v = (XMesaVisual) CALLOC_STRUCT(xmesa_visual);
660   if (!v) {
661      return NULL;
662   }
663
664   v->display = display;
665
666   /* Save a copy of the XVisualInfo struct because the user may X_mesa_free()
667    * the struct but we may need some of the information contained in it
668    * at a later time.
669    */
670   v->visinfo = (XVisualInfo *) MALLOC(sizeof(*visinfo));
671   if (!v->visinfo) {
672      _mesa_free(v);
673      return NULL;
674   }
675   MEMCPY(v->visinfo, visinfo, sizeof(*visinfo));
676
677   v->ximage_flag = ximage_flag;
678
679   v->mesa_visual.redMask = visinfo->red_mask;
680   v->mesa_visual.greenMask = visinfo->green_mask;
681   v->mesa_visual.blueMask = visinfo->blue_mask;
682   v->mesa_visual.visualID = visinfo->visualid;
683   v->mesa_visual.screen = visinfo->screen;
684
685#if !(defined(__cplusplus) || defined(c_plusplus))
686   v->mesa_visual.visualType = xmesa_convert_from_x_visual_type(visinfo->class);
687#else
688   v->mesa_visual.visualType = xmesa_convert_from_x_visual_type(visinfo->c_class);
689#endif
690
691   v->mesa_visual.visualRating = visualCaveat;
692
693   if (alpha_flag)
694      v->mesa_visual.alphaBits = 8;
695
696   (void) initialize_visual_and_buffer( v, NULL, rgb_flag, 0, 0 );
697
698   {
699      const int xclass = v->mesa_visual.visualType;
700      if (xclass == GLX_TRUE_COLOR || xclass == GLX_DIRECT_COLOR) {
701         red_bits   = _mesa_bitcount(GET_REDMASK(v));
702         green_bits = _mesa_bitcount(GET_GREENMASK(v));
703         blue_bits  = _mesa_bitcount(GET_BLUEMASK(v));
704      }
705      else {
706         /* this is an approximation */
707         int depth;
708         depth = v->visinfo->depth;
709         red_bits = depth / 3;
710         depth -= red_bits;
711         green_bits = depth / 2;
712         depth -= green_bits;
713         blue_bits = depth;
714         alpha_bits = 0;
715         assert( red_bits + green_bits + blue_bits == v->visinfo->depth );
716      }
717      alpha_bits = v->mesa_visual.alphaBits;
718   }
719
720   _mesa_initialize_visual( &v->mesa_visual,
721                            rgb_flag, db_flag, stereo_flag,
722                            red_bits, green_bits,
723                            blue_bits, alpha_bits,
724                            v->mesa_visual.indexBits,
725                            depth_size,
726                            stencil_size,
727                            accum_red_size, accum_green_size,
728                            accum_blue_size, accum_alpha_size,
729                            0 );
730
731   /* XXX minor hack */
732   v->mesa_visual.level = level;
733   return v;
734}
735
736
737PUBLIC
738void XMesaDestroyVisual( XMesaVisual v )
739{
740   _mesa_free(v->visinfo);
741   _mesa_free(v);
742}
743
744
745
746/**
747 * Create a new XMesaContext.
748 * \param v  the XMesaVisual
749 * \param share_list  another XMesaContext with which to share display
750 *                    lists or NULL if no sharing is wanted.
751 * \return an XMesaContext or NULL if error.
752 */
753PUBLIC
754XMesaContext XMesaCreateContext( XMesaVisual v, XMesaContext share_list )
755{
756   static GLboolean firstTime = GL_TRUE;
757   static struct pipe_screen *screen = NULL;
758   struct pipe_context *pipe = NULL;
759   XMesaContext c;
760   GLcontext *mesaCtx;
761   uint pf;
762
763   if (firstTime) {
764      pipe_mutex_init(_xmesa_lock);
765      screen = driver.create_pipe_screen();
766      firstTime = GL_FALSE;
767   }
768
769   /* Note: the XMesaContext contains a Mesa GLcontext struct (inheritance) */
770   c = (XMesaContext) CALLOC_STRUCT(xmesa_context);
771   if (!c)
772      return NULL;
773
774   pf = choose_pixel_format(v);
775   assert(pf);
776
777   c->xm_visual = v;
778   c->xm_buffer = NULL;   /* set later by XMesaMakeCurrent */
779   c->xm_read_buffer = NULL;
780
781   if (screen == NULL)
782      goto fail;
783
784   pipe = driver.create_pipe_context(screen, (void *) c);
785   if (pipe == NULL)
786      goto fail;
787
788   c->st = st_create_context(pipe,
789                             &v->mesa_visual,
790                             share_list ? share_list->st : NULL);
791   if (c->st == NULL)
792      goto fail;
793
794   mesaCtx = c->st->ctx;
795   c->st->ctx->DriverCtx = c;
796
797   return c;
798
799fail:
800   if (c->st)
801      st_destroy_context(c->st);
802   else if (pipe)
803      pipe->destroy(pipe);
804
805   _mesa_free(c);
806   return NULL;
807}
808
809
810
811PUBLIC
812void XMesaDestroyContext( XMesaContext c )
813{
814   st_destroy_context(c->st);
815
816   /* FIXME: We should destroy the screen here, but if we do so, surfaces may
817    * outlive it, causing segfaults
818   struct pipe_screen *screen = c->st->pipe->screen;
819   screen->destroy(screen);
820   */
821
822   _mesa_free(c);
823}
824
825
826
827/**
828 * Private function for creating an XMesaBuffer which corresponds to an
829 * X window or pixmap.
830 * \param v  the window's XMesaVisual
831 * \param w  the window we're wrapping
832 * \return  new XMesaBuffer or NULL if error
833 */
834PUBLIC XMesaBuffer
835XMesaCreateWindowBuffer(XMesaVisual v, Window w)
836{
837   XWindowAttributes attr;
838   XMesaBuffer b;
839   Colormap cmap;
840   int depth;
841
842   assert(v);
843   assert(w);
844
845   /* Check that window depth matches visual depth */
846   XGetWindowAttributes( v->display, w, &attr );
847   depth = attr.depth;
848   if (v->visinfo->depth != depth) {
849      _mesa_warning(NULL, "XMesaCreateWindowBuffer: depth mismatch between visual (%d) and window (%d)!\n",
850                    v->visinfo->depth, depth);
851      return NULL;
852   }
853
854   /* Find colormap */
855   if (attr.colormap) {
856      cmap = attr.colormap;
857   }
858   else {
859      _mesa_warning(NULL, "Window %u has no colormap!\n", (unsigned int) w);
860      /* this is weird, a window w/out a colormap!? */
861      /* OK, let's just allocate a new one and hope for the best */
862      cmap = XCreateColormap(v->display, w, attr.visual, AllocNone);
863   }
864
865   b = create_xmesa_buffer((Drawable) w, WINDOW, v, cmap);
866   if (!b)
867      return NULL;
868
869   if (!initialize_visual_and_buffer( v, b, v->mesa_visual.rgbMode,
870                                      (Drawable) w, cmap )) {
871      xmesa_free_buffer(b);
872      return NULL;
873   }
874
875   return b;
876}
877
878
879
880/**
881 * Create a new XMesaBuffer from an X pixmap.
882 *
883 * \param v    the XMesaVisual
884 * \param p    the pixmap
885 * \param cmap the colormap, may be 0 if using a \c GLX_TRUE_COLOR or
886 *             \c GLX_DIRECT_COLOR visual for the pixmap
887 * \returns new XMesaBuffer or NULL if error
888 */
889PUBLIC XMesaBuffer
890XMesaCreatePixmapBuffer(XMesaVisual v, Pixmap p, Colormap cmap)
891{
892   XMesaBuffer b;
893
894   assert(v);
895
896   b = create_xmesa_buffer((Drawable) p, PIXMAP, v, cmap);
897   if (!b)
898      return NULL;
899
900   if (!initialize_visual_and_buffer(v, b, v->mesa_visual.rgbMode,
901				     (Drawable) p, cmap)) {
902      xmesa_free_buffer(b);
903      return NULL;
904   }
905
906   return b;
907}
908
909
910/**
911 * For GLX_EXT_texture_from_pixmap
912 */
913XMesaBuffer
914XMesaCreatePixmapTextureBuffer(XMesaVisual v, Pixmap p,
915                               Colormap cmap,
916                               int format, int target, int mipmap)
917{
918   GET_CURRENT_CONTEXT(ctx);
919   XMesaBuffer b;
920   GLuint width, height;
921
922   assert(v);
923
924   b = create_xmesa_buffer((Drawable) p, PIXMAP, v, cmap);
925   if (!b)
926      return NULL;
927
928   /* get pixmap size, update framebuffer/renderbuffer dims */
929   xmesa_get_window_size(v->display, b, &width, &height);
930   _mesa_resize_framebuffer(NULL, &(b->stfb->Base), width, height);
931
932   if (target == 0) {
933      /* examine dims */
934      if (ctx->Extensions.ARB_texture_non_power_of_two) {
935         target = GLX_TEXTURE_2D_EXT;
936      }
937      else if (   _mesa_bitcount(width)  == 1
938               && _mesa_bitcount(height) == 1) {
939         /* power of two size */
940         if (height == 1) {
941            target = GLX_TEXTURE_1D_EXT;
942         }
943         else {
944            target = GLX_TEXTURE_2D_EXT;
945         }
946      }
947      else if (ctx->Extensions.NV_texture_rectangle) {
948         target = GLX_TEXTURE_RECTANGLE_EXT;
949      }
950      else {
951         /* non power of two textures not supported */
952         XMesaDestroyBuffer(b);
953         return 0;
954      }
955   }
956
957   b->TextureTarget = target;
958   b->TextureFormat = format;
959   b->TextureMipmap = mipmap;
960
961   if (!initialize_visual_and_buffer(v, b, v->mesa_visual.rgbMode,
962				     (Drawable) p, cmap)) {
963      xmesa_free_buffer(b);
964      return NULL;
965   }
966
967   return b;
968}
969
970
971
972XMesaBuffer
973XMesaCreatePBuffer(XMesaVisual v, Colormap cmap,
974                   unsigned int width, unsigned int height)
975{
976   Window root;
977   Drawable drawable;  /* X Pixmap Drawable */
978   XMesaBuffer b;
979
980   /* allocate pixmap for front buffer */
981   root = RootWindow( v->display, v->visinfo->screen );
982   drawable = XCreatePixmap(v->display, root, width, height,
983                            v->visinfo->depth);
984   if (!drawable)
985      return NULL;
986
987   b = create_xmesa_buffer(drawable, PBUFFER, v, cmap);
988   if (!b)
989      return NULL;
990
991   if (!initialize_visual_and_buffer(v, b, v->mesa_visual.rgbMode,
992				     drawable, cmap)) {
993      xmesa_free_buffer(b);
994      return NULL;
995   }
996
997   return b;
998}
999
1000
1001
1002/*
1003 * Deallocate an XMesaBuffer structure and all related info.
1004 */
1005PUBLIC void
1006XMesaDestroyBuffer(XMesaBuffer b)
1007{
1008   xmesa_free_buffer(b);
1009}
1010
1011
1012/**
1013 * Query the current window size and update the corresponding GLframebuffer
1014 * and all attached renderbuffers.
1015 * Called when:
1016 *  1. the first time a buffer is bound to a context.
1017 *  2. SwapBuffers.  XXX probabaly from xm_flush_frontbuffer() too...
1018 * Note: it's possible (and legal) for xmctx to be NULL.  That can happen
1019 * when resizing a buffer when no rendering context is bound.
1020 */
1021void
1022xmesa_check_and_update_buffer_size(XMesaContext xmctx, XMesaBuffer drawBuffer)
1023{
1024   GLuint width, height;
1025   xmesa_get_window_size(drawBuffer->xm_visual->display, drawBuffer, &width, &height);
1026   st_resize_framebuffer(drawBuffer->stfb, width, height);
1027}
1028
1029
1030
1031
1032/*
1033 * Bind buffer b to context c and make c the current rendering context.
1034 */
1035PUBLIC
1036GLboolean XMesaMakeCurrent2( XMesaContext c, XMesaBuffer drawBuffer,
1037                             XMesaBuffer readBuffer )
1038{
1039   XMesaContext old_ctx = XMesaGetCurrentContext();
1040
1041   if (old_ctx && old_ctx != c) {
1042      XMesaFlush(old_ctx);
1043      old_ctx->xm_buffer = NULL;
1044      old_ctx->xm_read_buffer = NULL;
1045   }
1046
1047   if (c) {
1048      if (!drawBuffer || !readBuffer)
1049         return GL_FALSE;  /* must specify buffers! */
1050
1051      if (c == old_ctx &&
1052	  c->xm_buffer == drawBuffer &&
1053	  c->xm_read_buffer == readBuffer)
1054	 return GL_TRUE;
1055
1056      c->xm_buffer = drawBuffer;
1057      c->xm_read_buffer = readBuffer;
1058
1059      st_make_current(c->st, drawBuffer->stfb, readBuffer->stfb);
1060
1061      xmesa_check_and_update_buffer_size(c, drawBuffer);
1062      if (readBuffer != drawBuffer)
1063         xmesa_check_and_update_buffer_size(c, readBuffer);
1064
1065      /* Solution to Stephane Rehel's problem with glXReleaseBuffersMESA(): */
1066      drawBuffer->wasCurrent = GL_TRUE;
1067   }
1068   else {
1069      /* Detach */
1070      st_make_current( NULL, NULL, NULL );
1071
1072   }
1073   return GL_TRUE;
1074}
1075
1076
1077/*
1078 * Unbind the context c from its buffer.
1079 */
1080GLboolean XMesaUnbindContext( XMesaContext c )
1081{
1082   /* A no-op for XFree86 integration purposes */
1083   return GL_TRUE;
1084}
1085
1086
1087XMesaContext XMesaGetCurrentContext( void )
1088{
1089   GET_CURRENT_CONTEXT(ctx);
1090   if (ctx) {
1091      XMesaContext xmesa = xmesa_context(ctx);
1092      return xmesa;
1093   }
1094   else {
1095      return 0;
1096   }
1097}
1098
1099
1100
1101/**
1102 * Swap front and back color buffers and have winsys display front buffer.
1103 * If there's no front color buffer no swap actually occurs.
1104 */
1105PUBLIC
1106void XMesaSwapBuffers( XMesaBuffer b )
1107{
1108   struct pipe_surface *frontLeftSurf;
1109
1110   st_swapbuffers(b->stfb, &frontLeftSurf, NULL);
1111
1112   if (frontLeftSurf) {
1113      driver.display_surface(b, frontLeftSurf);
1114   }
1115
1116   xmesa_check_and_update_buffer_size(NULL, b);
1117}
1118
1119
1120
1121/*
1122 * Copy sub-region of back buffer to front buffer
1123 */
1124void XMesaCopySubBuffer( XMesaBuffer b, int x, int y, int width, int height )
1125{
1126   struct pipe_surface *surf_front;
1127   struct pipe_surface *surf_back;
1128   struct pipe_context *pipe = NULL; /* XXX fix */
1129
1130   st_get_framebuffer_surface(b->stfb, ST_SURFACE_FRONT_LEFT, &surf_front);
1131   st_get_framebuffer_surface(b->stfb, ST_SURFACE_BACK_LEFT, &surf_back);
1132
1133   if (!surf_front || !surf_back)
1134      return;
1135
1136   pipe->surface_copy(pipe,
1137                      surf_front, x, y,  /* dest */
1138                      surf_back, x, y,   /* src */
1139                      width, height);
1140}
1141
1142
1143
1144void XMesaFlush( XMesaContext c )
1145{
1146   if (c && c->xm_visual->display) {
1147      st_finish(c->st);
1148      XSync( c->xm_visual->display, False );
1149   }
1150}
1151
1152
1153
1154
1155
1156XMesaBuffer XMesaFindBuffer( Display *dpy, Drawable d )
1157{
1158   XMesaBuffer b;
1159   for (b = XMesaBufferList; b; b = b->Next) {
1160      if (b->drawable == d && b->xm_visual->display == dpy) {
1161         return b;
1162      }
1163   }
1164   return NULL;
1165}
1166
1167
1168/**
1169 * Free/destroy all XMesaBuffers associated with given display.
1170 */
1171void xmesa_destroy_buffers_on_display(Display *dpy)
1172{
1173   XMesaBuffer b, next;
1174   for (b = XMesaBufferList; b; b = next) {
1175      next = b->Next;
1176      if (b->xm_visual->display == dpy) {
1177         xmesa_free_buffer(b);
1178      }
1179   }
1180}
1181
1182
1183/*
1184 * Look for XMesaBuffers whose X window has been destroyed.
1185 * Deallocate any such XMesaBuffers.
1186 */
1187void XMesaGarbageCollect( void )
1188{
1189   XMesaBuffer b, next;
1190   for (b=XMesaBufferList; b; b=next) {
1191      next = b->Next;
1192      if (b->xm_visual &&
1193          b->xm_visual->display &&
1194          b->drawable &&
1195          b->type == WINDOW) {
1196         XSync(b->xm_visual->display, False);
1197         if (!window_exists( b->xm_visual->display, b->drawable )) {
1198            /* found a dead window, free the ancillary info */
1199            XMesaDestroyBuffer( b );
1200         }
1201      }
1202   }
1203}
1204
1205
1206
1207
1208PUBLIC void
1209XMesaBindTexImage(Display *dpy, XMesaBuffer drawable, int buffer,
1210                  const int *attrib_list)
1211{
1212}
1213
1214
1215
1216PUBLIC void
1217XMesaReleaseTexImage(Display *dpy, XMesaBuffer drawable, int buffer)
1218{
1219}
1220
1221