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Lift VBO/tnl stuff up out of drivers
[mesa.git] / src / mesa / drivers / x11 / xm_api.c
1 /*
2 * Mesa 3-D graphics library
3 * Version: 7.1
4 *
5 * Copyright (C) 1999-2007 Brian Paul All Rights Reserved.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation
10 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11 * and/or sell copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
21 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
23 */
24
25 /**
26 * \file xm_api.c
27 *
28 * All the XMesa* API functions.
29 *
30 *
31 * NOTES:
32 *
33 * The window coordinate system origin (0,0) is in the lower-left corner
34 * of the window. X11's window coordinate origin is in the upper-left
35 * corner of the window. Therefore, most drawing functions in this
36 * file have to flip Y coordinates.
37 *
38 * Define USE_XSHM in the Makefile with -DUSE_XSHM if you want to compile
39 * in support for the MIT Shared Memory extension. If enabled, when you
40 * use an Ximage for the back buffer in double buffered mode, the "swap"
41 * operation will be faster. You must also link with -lXext.
42 *
43 * Byte swapping: If the Mesa host and the X display use a different
44 * byte order then there's some trickiness to be aware of when using
45 * XImages. The byte ordering used for the XImage is that of the X
46 * display, not the Mesa host.
47 * The color-to-pixel encoding for True/DirectColor must be done
48 * according to the display's visual red_mask, green_mask, and blue_mask.
49 * If XPutPixel is used to put a pixel into an XImage then XPutPixel will
50 * do byte swapping if needed. If one wants to directly "poke" the pixel
51 * into the XImage's buffer then the pixel must be byte swapped first. In
52 * Mesa, when byte swapping is needed we use the PF_TRUECOLOR pixel format
53 * and use XPutPixel everywhere except in the implementation of
54 * glClear(GL_COLOR_BUFFER_BIT). We want this function to be fast so
55 * instead of using XPutPixel we "poke" our values after byte-swapping
56 * the clear pixel value if needed.
57 *
58 */
59
60 #ifdef __CYGWIN__
61 #undef WIN32
62 #undef __WIN32__
63 #endif
64
65 #include "glxheader.h"
66 #include "GL/xmesa.h"
67 #include "xmesaP.h"
68 #include "context.h"
69 #include "extensions.h"
70 #include "framebuffer.h"
71 #include "glthread.h"
72 #include "imports.h"
73 #include "macros.h"
74 #include "renderbuffer.h"
75 #include "teximage.h"
76 #include "swrast/swrast.h"
77 #include "swrast_setup/swrast_setup.h"
78 #include "vbo/vbo.h"
79 #if 0
80 #include "tnl/tnl.h"
81 #include "tnl/t_context.h"
82 #include "tnl/t_pipeline.h"
83 #endif
84 #include "drivers/common/driverfuncs.h"
85
86 #include "state_tracker/st_public.h"
87 #include "state_tracker/st_context.h"
88 #include "pipe/softpipe/sp_context.h"
89 #include "pipe/p_defines.h"
90
91 /**
92 * Global X driver lock
93 */
94 _glthread_Mutex _xmesa_lock;
95
96
97
98 /**
99 * Lookup tables for HPCR pixel format:
100 */
101 static short hpcr_rgbTbl[3][256] = {
102 {
103 16, 16, 17, 17, 18, 18, 19, 19, 20, 20, 21, 21, 22, 22, 23, 23,
104 24, 24, 25, 25, 26, 26, 27, 27, 28, 28, 29, 29, 30, 30, 31, 31,
105 32, 32, 33, 33, 34, 34, 35, 35, 36, 36, 37, 37, 38, 38, 39, 39,
106 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
107 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
108 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
109 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95,
110 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111,
111 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127,
112 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143,
113 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159,
114 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175,
115 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191,
116 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207,
117 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223,
118 224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239
119 },
120 {
121 16, 16, 17, 17, 18, 18, 19, 19, 20, 20, 21, 21, 22, 22, 23, 23,
122 24, 24, 25, 25, 26, 26, 27, 27, 28, 28, 29, 29, 30, 30, 31, 31,
123 32, 32, 33, 33, 34, 34, 35, 35, 36, 36, 37, 37, 38, 38, 39, 39,
124 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
125 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
126 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
127 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95,
128 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111,
129 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127,
130 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143,
131 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159,
132 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175,
133 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191,
134 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207,
135 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223,
136 224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239
137 },
138 {
139 32, 32, 33, 33, 34, 34, 35, 35, 36, 36, 37, 37, 38, 38, 39, 39,
140 40, 40, 41, 41, 42, 42, 43, 43, 44, 44, 45, 45, 46, 46, 47, 47,
141 48, 48, 49, 49, 50, 50, 51, 51, 52, 52, 53, 53, 54, 54, 55, 55,
142 56, 56, 57, 57, 58, 58, 59, 59, 60, 60, 61, 61, 62, 62, 63, 63,
143 64, 64, 65, 65, 66, 66, 67, 67, 68, 68, 69, 69, 70, 70, 71, 71,
144 72, 72, 73, 73, 74, 74, 75, 75, 76, 76, 77, 77, 78, 78, 79, 79,
145 80, 80, 81, 81, 82, 82, 83, 83, 84, 84, 85, 85, 86, 86, 87, 87,
146 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95,
147 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111,
148 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127,
149 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143,
150 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159,
151 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175,
152 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191,
153 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207,
154 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223
155 }
156 };
157
158
159
160 /**********************************************************************/
161 /***** X Utility Functions *****/
162 /**********************************************************************/
163
164
165 /**
166 * Return the host's byte order as LSBFirst or MSBFirst ala X.
167 */
168 #ifndef XFree86Server
169 static int host_byte_order( void )
170 {
171 int i = 1;
172 char *cptr = (char *) &i;
173 return (*cptr==1) ? LSBFirst : MSBFirst;
174 }
175 #endif
176
177
178 /**
179 * Check if the X Shared Memory extension is available.
180 * Return: 0 = not available
181 * 1 = shared XImage support available
182 * 2 = shared Pixmap support available also
183 */
184 static int check_for_xshm( XMesaDisplay *display )
185 {
186 #if defined(USE_XSHM) && !defined(XFree86Server)
187 int major, minor, ignore;
188 Bool pixmaps;
189
190 if (XQueryExtension( display, "MIT-SHM", &ignore, &ignore, &ignore )) {
191 if (XShmQueryVersion( display, &major, &minor, &pixmaps )==True) {
192 return (pixmaps==True) ? 2 : 1;
193 }
194 else {
195 return 0;
196 }
197 }
198 else {
199 return 0;
200 }
201 #else
202 /* No XSHM support */
203 return 0;
204 #endif
205 }
206
207
208 /**
209 * Apply gamma correction to an intensity value in [0..max]. Return the
210 * new intensity value.
211 */
212 static GLint
213 gamma_adjust( GLfloat gamma, GLint value, GLint max )
214 {
215 if (gamma == 1.0) {
216 return value;
217 }
218 else {
219 double x = (double) value / (double) max;
220 return IROUND_POS((GLfloat) max * _mesa_pow(x, 1.0F/gamma));
221 }
222 }
223
224
225
226 /**
227 * Return the true number of bits per pixel for XImages.
228 * For example, if we request a 24-bit deep visual we may actually need/get
229 * 32bpp XImages. This function returns the appropriate bpp.
230 * Input: dpy - the X display
231 * visinfo - desribes the visual to be used for XImages
232 * Return: true number of bits per pixel for XImages
233 */
234 static int
235 bits_per_pixel( XMesaVisual xmv )
236 {
237 #ifdef XFree86Server
238 const int depth = xmv->nplanes;
239 int i;
240 assert(depth > 0);
241 for (i = 0; i < screenInfo.numPixmapFormats; i++) {
242 if (screenInfo.formats[i].depth == depth)
243 return screenInfo.formats[i].bitsPerPixel;
244 }
245 return depth; /* should never get here, but this should be safe */
246 #else
247 XMesaDisplay *dpy = xmv->display;
248 XMesaVisualInfo visinfo = xmv->visinfo;
249 XMesaImage *img;
250 int bitsPerPixel;
251 /* Create a temporary XImage */
252 img = XCreateImage( dpy, visinfo->visual, visinfo->depth,
253 ZPixmap, 0, /*format, offset*/
254 (char*) MALLOC(8), /*data*/
255 1, 1, /*width, height*/
256 32, /*bitmap_pad*/
257 0 /*bytes_per_line*/
258 );
259 assert(img);
260 /* grab the bits/pixel value */
261 bitsPerPixel = img->bits_per_pixel;
262 /* free the XImage */
263 _mesa_free( img->data );
264 img->data = NULL;
265 XMesaDestroyImage( img );
266 return bitsPerPixel;
267 #endif
268 }
269
270
271
272 /*
273 * Determine if a given X window ID is valid (window exists).
274 * Do this by calling XGetWindowAttributes() for the window and
275 * checking if we catch an X error.
276 * Input: dpy - the display
277 * win - the window to check for existance
278 * Return: GL_TRUE - window exists
279 * GL_FALSE - window doesn't exist
280 */
281 #ifndef XFree86Server
282 static GLboolean WindowExistsFlag;
283
284 static int window_exists_err_handler( XMesaDisplay* dpy, XErrorEvent* xerr )
285 {
286 (void) dpy;
287 if (xerr->error_code == BadWindow) {
288 WindowExistsFlag = GL_FALSE;
289 }
290 return 0;
291 }
292
293 static GLboolean window_exists( XMesaDisplay *dpy, Window win )
294 {
295 XWindowAttributes wa;
296 int (*old_handler)( XMesaDisplay*, XErrorEvent* );
297 WindowExistsFlag = GL_TRUE;
298 old_handler = XSetErrorHandler(window_exists_err_handler);
299 XGetWindowAttributes( dpy, win, &wa ); /* dummy request */
300 XSetErrorHandler(old_handler);
301 return WindowExistsFlag;
302 }
303
304 static Status
305 get_drawable_size( XMesaDisplay *dpy, Drawable d, GLuint *width, GLuint *height )
306 {
307 Window root;
308 Status stat;
309 int xpos, ypos;
310 unsigned int w, h, bw, depth;
311 stat = XGetGeometry(dpy, d, &root, &xpos, &ypos, &w, &h, &bw, &depth);
312 *width = w;
313 *height = h;
314 return stat;
315 }
316 #endif
317
318
319 /**
320 * Return the size of the window (or pixmap) that corresponds to the
321 * given XMesaBuffer.
322 * \param width returns width in pixels
323 * \param height returns height in pixels
324 */
325 void
326 xmesa_get_window_size(XMesaDisplay *dpy, XMesaBuffer b,
327 GLuint *width, GLuint *height)
328 {
329 #ifdef XFree86Server
330 *width = MIN2(b->frontxrb->drawable->width, MAX_WIDTH);
331 *height = MIN2(b->frontxrb->drawable->height, MAX_HEIGHT);
332 #else
333 Status stat;
334
335 _glthread_LOCK_MUTEX(_xmesa_lock);
336 XSync(b->xm_visual->display, 0); /* added for Chromium */
337 stat = get_drawable_size(dpy, b->frontxrb->pixmap, width, height);
338 _glthread_UNLOCK_MUTEX(_xmesa_lock);
339
340 if (!stat) {
341 /* probably querying a window that's recently been destroyed */
342 _mesa_warning(NULL, "XGetGeometry failed!\n");
343 *width = *height = 1;
344 }
345 #endif
346 }
347
348
349
350 /**********************************************************************/
351 /***** Linked list of XMesaBuffers *****/
352 /**********************************************************************/
353
354 XMesaBuffer XMesaBufferList = NULL;
355
356
357 /**
358 * Allocate a new XMesaBuffer object which corresponds to the given drawable.
359 * Note that XMesaBuffer is derived from GLframebuffer.
360 * The new XMesaBuffer will not have any size (Width=Height=0).
361 *
362 * \param d the corresponding X drawable (window or pixmap)
363 * \param type either WINDOW, PIXMAP or PBUFFER, describing d
364 * \param vis the buffer's visual
365 * \param cmap the window's colormap, if known.
366 * \return new XMesaBuffer or NULL if any problem
367 */
368 static XMesaBuffer
369 create_xmesa_buffer(XMesaDrawable d, BufferType type,
370 XMesaVisual vis, XMesaColormap cmap)
371 {
372 XMesaBuffer b;
373
374 ASSERT(type == WINDOW || type == PIXMAP || type == PBUFFER);
375
376 b = (XMesaBuffer) CALLOC_STRUCT(xmesa_buffer);
377 if (!b)
378 return NULL;
379
380 b->display = vis->display;
381 b->xm_visual = vis;
382 b->type = type;
383 b->cmap = cmap;
384
385 _mesa_initialize_framebuffer(&b->mesa_buffer, &vis->mesa_visual);
386 b->mesa_buffer.Delete = xmesa_delete_framebuffer;
387
388 /*
389 * Front renderbuffer
390 */
391 b->frontxrb = xmesa_create_renderbuffer(NULL, 0, &vis->mesa_visual, GL_FALSE);
392 if (!b->frontxrb) {
393 _mesa_free(b);
394 return NULL;
395 }
396 b->frontxrb->Parent = b;
397 b->frontxrb->drawable = d;
398 b->frontxrb->pixmap = (XMesaPixmap) d;
399 _mesa_add_renderbuffer(&b->mesa_buffer, BUFFER_FRONT_LEFT,
400 &b->frontxrb->St.Base);
401
402 /*
403 * Back renderbuffer
404 */
405 if (vis->mesa_visual.doubleBufferMode) {
406 b->backxrb = xmesa_create_renderbuffer(NULL, 0, &vis->mesa_visual, GL_TRUE);
407 if (!b->backxrb) {
408 /* XXX free front xrb too */
409 _mesa_free(b);
410 return NULL;
411 }
412 b->backxrb->Parent = b;
413 /* determine back buffer implementation */
414 b->db_mode = vis->ximage_flag ? BACK_XIMAGE : BACK_PIXMAP;
415
416 _mesa_add_renderbuffer(&b->mesa_buffer, BUFFER_BACK_LEFT,
417 &b->backxrb->St.Base);
418 }
419
420 /*
421 * Software alpha planes
422 */
423 if (vis->mesa_visual.alphaBits > 0
424 && vis->undithered_pf != PF_8A8B8G8R
425 && vis->undithered_pf != PF_8A8R8G8B) {
426 /* Visual has alpha, but pixel format doesn't support it.
427 * We'll use an alpha renderbuffer wrapper.
428 */
429 b->swAlpha = GL_TRUE;
430 }
431 else {
432 b->swAlpha = GL_FALSE;
433 }
434
435 if (vis->mesa_visual.depthBits > 0 &&
436 vis->mesa_visual.stencilBits > 0) {
437 /* combined depth/stencil */
438 struct gl_renderbuffer *rb
439 = st_new_renderbuffer_fb(GL_DEPTH24_STENCIL8_EXT);
440 _mesa_add_renderbuffer(&b->mesa_buffer, BUFFER_DEPTH, rb);
441 _mesa_add_renderbuffer(&b->mesa_buffer, BUFFER_STENCIL, rb);
442 }
443 else {
444 if (vis->mesa_visual.depthBits > 0) {
445 struct gl_renderbuffer *rb
446 = st_new_renderbuffer_fb(GL_DEPTH_COMPONENT32);
447 _mesa_add_renderbuffer(&b->mesa_buffer, BUFFER_DEPTH, rb);
448 }
449
450 if (vis->mesa_visual.stencilBits > 0) {
451 struct gl_renderbuffer *rb
452 = st_new_renderbuffer_fb(GL_STENCIL_INDEX8_EXT);
453 _mesa_add_renderbuffer(&b->mesa_buffer, BUFFER_STENCIL, rb);
454 }
455 }
456
457 if (vis->mesa_visual.accumRedBits > 0) {
458 struct gl_renderbuffer *rb
459 = st_new_renderbuffer_fb(GL_RGBA16);
460 _mesa_add_renderbuffer(&b->mesa_buffer, BUFFER_ACCUM, rb);
461 }
462
463
464 /*
465 * Other renderbuffer (depth, stencil, etc)
466 */
467 _mesa_add_soft_renderbuffers(&b->mesa_buffer,
468 GL_FALSE, /* color */
469 GL_FALSE, /*vis->mesa_visual.haveDepthBuffer,*/
470 GL_FALSE, /* stencil */
471 GL_FALSE, /* accum */
472 b->swAlpha,
473 vis->mesa_visual.numAuxBuffers > 0 );
474
475 /* GLX_EXT_texture_from_pixmap */
476 b->TextureTarget = 0;
477 b->TextureFormat = GLX_TEXTURE_FORMAT_NONE_EXT;
478 b->TextureMipmap = 0;
479
480 /* insert buffer into linked list */
481 b->Next = XMesaBufferList;
482 XMesaBufferList = b;
483
484 return b;
485 }
486
487
488 /**
489 * Find an XMesaBuffer by matching X display and colormap but NOT matching
490 * the notThis buffer.
491 */
492 XMesaBuffer
493 xmesa_find_buffer(XMesaDisplay *dpy, XMesaColormap cmap, XMesaBuffer notThis)
494 {
495 XMesaBuffer b;
496 for (b=XMesaBufferList; b; b=b->Next) {
497 if (b->display==dpy && b->cmap==cmap && b!=notThis) {
498 return b;
499 }
500 }
501 return NULL;
502 }
503
504
505 /**
506 * Remove buffer from linked list, delete if no longer referenced.
507 */
508 static void
509 xmesa_free_buffer(XMesaBuffer buffer)
510 {
511 XMesaBuffer prev = NULL, b;
512
513 for (b = XMesaBufferList; b; b = b->Next) {
514 if (b == buffer) {
515 struct gl_framebuffer *fb = &buffer->mesa_buffer;
516
517 /* unlink buffer from list */
518 if (prev)
519 prev->Next = buffer->Next;
520 else
521 XMesaBufferList = buffer->Next;
522
523 /* mark as delete pending */
524 fb->DeletePending = GL_TRUE;
525
526 /* Since the X window for the XMesaBuffer is going away, we don't
527 * want to dereference this pointer in the future.
528 */
529 b->frontxrb->drawable = 0;
530
531 /* Unreference. If count = zero we'll really delete the buffer */
532 _mesa_unreference_framebuffer(&fb);
533
534 return;
535 }
536 /* continue search */
537 prev = b;
538 }
539 /* buffer not found in XMesaBufferList */
540 _mesa_problem(NULL,"xmesa_free_buffer() - buffer not found\n");
541 }
542
543
544 /**
545 * Copy X color table stuff from one XMesaBuffer to another.
546 */
547 static void
548 copy_colortable_info(XMesaBuffer dst, const XMesaBuffer src)
549 {
550 MEMCPY(dst->color_table, src->color_table, sizeof(src->color_table));
551 MEMCPY(dst->pixel_to_r, src->pixel_to_r, sizeof(src->pixel_to_r));
552 MEMCPY(dst->pixel_to_g, src->pixel_to_g, sizeof(src->pixel_to_g));
553 MEMCPY(dst->pixel_to_b, src->pixel_to_b, sizeof(src->pixel_to_b));
554 dst->num_alloced = src->num_alloced;
555 MEMCPY(dst->alloced_colors, src->alloced_colors,
556 sizeof(src->alloced_colors));
557 }
558
559
560
561 /**********************************************************************/
562 /***** Misc Private Functions *****/
563 /**********************************************************************/
564
565
566 /**
567 * A replacement for XAllocColor. This function should never
568 * fail to allocate a color. When XAllocColor fails, we return
569 * the nearest matching color. If we have to allocate many colors
570 * this function isn't too efficient; the XQueryColors() could be
571 * done just once.
572 * Written by Michael Pichler, Brian Paul, Mark Kilgard
573 * Input: dpy - X display
574 * cmap - X colormap
575 * cmapSize - size of colormap
576 * In/Out: color - the XColor struct
577 * Output: exact - 1=exact color match, 0=closest match
578 * alloced - 1=XAlloc worked, 0=XAlloc failed
579 */
580 static void
581 noFaultXAllocColor( int client,
582 XMesaDisplay *dpy,
583 XMesaColormap cmap,
584 int cmapSize,
585 XMesaColor *color,
586 int *exact, int *alloced )
587 {
588 #ifdef XFree86Server
589 Pixel *ppixIn;
590 xrgb *ctable;
591 #else
592 /* we'll try to cache ctable for better remote display performance */
593 static Display *prevDisplay = NULL;
594 static XMesaColormap prevCmap = 0;
595 static int prevCmapSize = 0;
596 static XMesaColor *ctable = NULL;
597 #endif
598 XMesaColor subColor;
599 int i, bestmatch;
600 double mindist; /* 3*2^16^2 exceeds long int precision. */
601
602 (void) client;
603
604 /* First try just using XAllocColor. */
605 #ifdef XFree86Server
606 if (AllocColor(cmap,
607 &color->red, &color->green, &color->blue,
608 &color->pixel,
609 client) == Success)
610 #else
611 if (XAllocColor(dpy, cmap, color))
612 #endif
613 {
614 *exact = 1;
615 *alloced = 1;
616 return;
617 }
618
619 /* Alloc failed, search for closest match */
620
621 /* Retrieve color table entries. */
622 /* XXX alloca candidate. */
623 #ifdef XFree86Server
624 ppixIn = (Pixel *) MALLOC(cmapSize * sizeof(Pixel));
625 ctable = (xrgb *) MALLOC(cmapSize * sizeof(xrgb));
626 for (i = 0; i < cmapSize; i++) {
627 ppixIn[i] = i;
628 }
629 QueryColors(cmap, cmapSize, ppixIn, ctable);
630 #else
631 if (prevDisplay != dpy || prevCmap != cmap
632 || prevCmapSize != cmapSize || !ctable) {
633 /* free previously cached color table */
634 if (ctable)
635 _mesa_free(ctable);
636 /* Get the color table from X */
637 ctable = (XMesaColor *) MALLOC(cmapSize * sizeof(XMesaColor));
638 assert(ctable);
639 for (i = 0; i < cmapSize; i++) {
640 ctable[i].pixel = i;
641 }
642 XQueryColors(dpy, cmap, ctable, cmapSize);
643 prevDisplay = dpy;
644 prevCmap = cmap;
645 prevCmapSize = cmapSize;
646 }
647 #endif
648
649 /* Find best match. */
650 bestmatch = -1;
651 mindist = 0.0;
652 for (i = 0; i < cmapSize; i++) {
653 double dr = 0.30 * ((double) color->red - (double) ctable[i].red);
654 double dg = 0.59 * ((double) color->green - (double) ctable[i].green);
655 double db = 0.11 * ((double) color->blue - (double) ctable[i].blue);
656 double dist = dr * dr + dg * dg + db * db;
657 if (bestmatch < 0 || dist < mindist) {
658 bestmatch = i;
659 mindist = dist;
660 }
661 }
662
663 /* Return result. */
664 subColor.red = ctable[bestmatch].red;
665 subColor.green = ctable[bestmatch].green;
666 subColor.blue = ctable[bestmatch].blue;
667 /* Try to allocate the closest match color. This should only
668 * fail if the cell is read/write. Otherwise, we're incrementing
669 * the cell's reference count.
670 */
671 #ifdef XFree86Server
672 if (AllocColor(cmap,
673 &subColor.red, &subColor.green, &subColor.blue,
674 &subColor.pixel,
675 client) == Success) {
676 #else
677 if (XAllocColor(dpy, cmap, &subColor)) {
678 #endif
679 *alloced = 1;
680 }
681 else {
682 /* do this to work around a problem reported by Frank Ortega */
683 subColor.pixel = (unsigned long) bestmatch;
684 subColor.red = ctable[bestmatch].red;
685 subColor.green = ctable[bestmatch].green;
686 subColor.blue = ctable[bestmatch].blue;
687 subColor.flags = DoRed | DoGreen | DoBlue;
688 *alloced = 0;
689 }
690 #ifdef XFree86Server
691 _mesa_free(ppixIn);
692 _mesa_free(ctable);
693 #else
694 /* don't free table, save it for next time */
695 #endif
696
697 *color = subColor;
698 *exact = 0;
699 }
700
701
702
703 /**
704 * Do setup for PF_GRAYSCALE pixel format.
705 * Note that buffer may be NULL.
706 */
707 static GLboolean
708 setup_grayscale(int client, XMesaVisual v,
709 XMesaBuffer buffer, XMesaColormap cmap)
710 {
711 if (GET_VISUAL_DEPTH(v)<4 || GET_VISUAL_DEPTH(v)>16) {
712 return GL_FALSE;
713 }
714
715 if (buffer) {
716 XMesaBuffer prevBuffer;
717
718 if (!cmap) {
719 return GL_FALSE;
720 }
721
722 prevBuffer = xmesa_find_buffer(v->display, cmap, buffer);
723 if (prevBuffer &&
724 (buffer->xm_visual->mesa_visual.rgbMode ==
725 prevBuffer->xm_visual->mesa_visual.rgbMode)) {
726 /* Copy colormap stuff from previous XMesaBuffer which uses same
727 * X colormap. Do this to avoid time spent in noFaultXAllocColor.
728 */
729 copy_colortable_info(buffer, prevBuffer);
730 }
731 else {
732 /* Allocate 256 shades of gray */
733 int gray;
734 int colorsfailed = 0;
735 for (gray=0;gray<256;gray++) {
736 GLint r = gamma_adjust( v->RedGamma, gray, 255 );
737 GLint g = gamma_adjust( v->GreenGamma, gray, 255 );
738 GLint b = gamma_adjust( v->BlueGamma, gray, 255 );
739 int exact, alloced;
740 XMesaColor xcol;
741 xcol.red = (r << 8) | r;
742 xcol.green = (g << 8) | g;
743 xcol.blue = (b << 8) | b;
744 noFaultXAllocColor( client, v->display,
745 cmap, GET_COLORMAP_SIZE(v),
746 &xcol, &exact, &alloced );
747 if (!exact) {
748 colorsfailed++;
749 }
750 if (alloced) {
751 assert(buffer->num_alloced<256);
752 buffer->alloced_colors[buffer->num_alloced] = xcol.pixel;
753 buffer->num_alloced++;
754 }
755
756 /*OLD
757 assert(gray < 576);
758 buffer->color_table[gray*3+0] = xcol.pixel;
759 buffer->color_table[gray*3+1] = xcol.pixel;
760 buffer->color_table[gray*3+2] = xcol.pixel;
761 assert(xcol.pixel < 65536);
762 buffer->pixel_to_r[xcol.pixel] = gray * 30 / 100;
763 buffer->pixel_to_g[xcol.pixel] = gray * 59 / 100;
764 buffer->pixel_to_b[xcol.pixel] = gray * 11 / 100;
765 */
766 buffer->color_table[gray] = xcol.pixel;
767 assert(xcol.pixel < 65536);
768 buffer->pixel_to_r[xcol.pixel] = gray;
769 buffer->pixel_to_g[xcol.pixel] = gray;
770 buffer->pixel_to_b[xcol.pixel] = gray;
771 }
772
773 if (colorsfailed && _mesa_getenv("MESA_DEBUG")) {
774 _mesa_warning(NULL,
775 "Note: %d out of 256 needed colors do not match exactly.\n",
776 colorsfailed );
777 }
778 }
779 }
780
781 v->dithered_pf = PF_Grayscale;
782 v->undithered_pf = PF_Grayscale;
783 return GL_TRUE;
784 }
785
786
787
788 /**
789 * Setup RGB rendering for a window with a PseudoColor, StaticColor,
790 * or 8-bit TrueColor visual visual. We try to allocate a palette of 225
791 * colors (5 red, 9 green, 5 blue) and dither to approximate a 24-bit RGB
792 * color. While this function was originally designed just for 8-bit
793 * visuals, it has also proven to work from 4-bit up to 16-bit visuals.
794 * Dithering code contributed by Bob Mercier.
795 */
796 static GLboolean
797 setup_dithered_color(int client, XMesaVisual v,
798 XMesaBuffer buffer, XMesaColormap cmap)
799 {
800 if (GET_VISUAL_DEPTH(v)<4 || GET_VISUAL_DEPTH(v)>16) {
801 return GL_FALSE;
802 }
803
804 if (buffer) {
805 XMesaBuffer prevBuffer;
806
807 if (!cmap) {
808 return GL_FALSE;
809 }
810
811 prevBuffer = xmesa_find_buffer(v->display, cmap, buffer);
812 if (prevBuffer &&
813 (buffer->xm_visual->mesa_visual.rgbMode ==
814 prevBuffer->xm_visual->mesa_visual.rgbMode)) {
815 /* Copy colormap stuff from previous, matching XMesaBuffer.
816 * Do this to avoid time spent in noFaultXAllocColor.
817 */
818 copy_colortable_info(buffer, prevBuffer);
819 }
820 else {
821 /* Allocate X colors and initialize color_table[], red_table[], etc */
822 int r, g, b, i;
823 int colorsfailed = 0;
824 for (r = 0; r < DITH_R; r++) {
825 for (g = 0; g < DITH_G; g++) {
826 for (b = 0; b < DITH_B; b++) {
827 XMesaColor xcol;
828 int exact, alloced;
829 xcol.red =gamma_adjust(v->RedGamma, r*65535/(DITH_R-1),65535);
830 xcol.green=gamma_adjust(v->GreenGamma, g*65535/(DITH_G-1),65535);
831 xcol.blue =gamma_adjust(v->BlueGamma, b*65535/(DITH_B-1),65535);
832 noFaultXAllocColor( client, v->display,
833 cmap, GET_COLORMAP_SIZE(v),
834 &xcol, &exact, &alloced );
835 if (!exact) {
836 colorsfailed++;
837 }
838 if (alloced) {
839 assert(buffer->num_alloced<256);
840 buffer->alloced_colors[buffer->num_alloced] = xcol.pixel;
841 buffer->num_alloced++;
842 }
843 i = DITH_MIX( r, g, b );
844 assert(i < 576);
845 buffer->color_table[i] = xcol.pixel;
846 assert(xcol.pixel < 65536);
847 buffer->pixel_to_r[xcol.pixel] = r * 255 / (DITH_R-1);
848 buffer->pixel_to_g[xcol.pixel] = g * 255 / (DITH_G-1);
849 buffer->pixel_to_b[xcol.pixel] = b * 255 / (DITH_B-1);
850 }
851 }
852 }
853
854 if (colorsfailed && _mesa_getenv("MESA_DEBUG")) {
855 _mesa_warning(NULL,
856 "Note: %d out of %d needed colors do not match exactly.\n",
857 colorsfailed, DITH_R * DITH_G * DITH_B );
858 }
859 }
860 }
861
862 v->dithered_pf = PF_Dither;
863 v->undithered_pf = PF_Lookup;
864 return GL_TRUE;
865 }
866
867
868 /**
869 * Setup for Hewlett Packard Color Recovery 8-bit TrueColor mode.
870 * HPCR simulates 24-bit color fidelity with an 8-bit frame buffer.
871 * Special dithering tables have to be initialized.
872 */
873 static void
874 setup_8bit_hpcr(XMesaVisual v)
875 {
876 /* HP Color Recovery contributed by: Alex De Bruyn (ad@lms.be)
877 * To work properly, the atom _HP_RGB_SMOOTH_MAP_LIST must be defined
878 * on the root window AND the colormap obtainable by XGetRGBColormaps
879 * for that atom must be set on the window. (see also tkInitWindow)
880 * If that colormap is not set, the output will look stripy.
881 */
882
883 /* Setup color tables with gamma correction */
884 int i;
885 double g;
886
887 g = 1.0 / v->RedGamma;
888 for (i=0; i<256; i++) {
889 GLint red = IROUND_POS(255.0 * _mesa_pow( hpcr_rgbTbl[0][i]/255.0, g ));
890 v->hpcr_rgbTbl[0][i] = CLAMP( red, 16, 239 );
891 }
892
893 g = 1.0 / v->GreenGamma;
894 for (i=0; i<256; i++) {
895 GLint green = IROUND_POS(255.0 * _mesa_pow( hpcr_rgbTbl[1][i]/255.0, g ));
896 v->hpcr_rgbTbl[1][i] = CLAMP( green, 16, 239 );
897 }
898
899 g = 1.0 / v->BlueGamma;
900 for (i=0; i<256; i++) {
901 GLint blue = IROUND_POS(255.0 * _mesa_pow( hpcr_rgbTbl[2][i]/255.0, g ));
902 v->hpcr_rgbTbl[2][i] = CLAMP( blue, 32, 223 );
903 }
904 v->undithered_pf = PF_HPCR; /* can't really disable dithering for now */
905 v->dithered_pf = PF_HPCR;
906
907 /* which method should I use to clear */
908 /* GL_FALSE: keep the ordinary method */
909 /* GL_TRUE : clear with dither pattern */
910 v->hpcr_clear_flag = _mesa_getenv("MESA_HPCR_CLEAR") ? GL_TRUE : GL_FALSE;
911
912 if (v->hpcr_clear_flag) {
913 v->hpcr_clear_pixmap = XMesaCreatePixmap(v->display,
914 DefaultRootWindow(v->display),
915 16, 2, 8);
916 #ifndef XFree86Server
917 v->hpcr_clear_ximage = XGetImage(v->display, v->hpcr_clear_pixmap,
918 0, 0, 16, 2, AllPlanes, ZPixmap);
919 #endif
920 }
921 }
922
923
924 /**
925 * Setup RGB rendering for a window with a True/DirectColor visual.
926 */
927 static void
928 setup_truecolor(XMesaVisual v, XMesaBuffer buffer, XMesaColormap cmap)
929 {
930 unsigned long rmask, gmask, bmask;
931 (void) buffer;
932 (void) cmap;
933
934 /* Compute red multiplier (mask) and bit shift */
935 v->rshift = 0;
936 rmask = GET_REDMASK(v);
937 while ((rmask & 1)==0) {
938 v->rshift++;
939 rmask = rmask >> 1;
940 }
941
942 /* Compute green multiplier (mask) and bit shift */
943 v->gshift = 0;
944 gmask = GET_GREENMASK(v);
945 while ((gmask & 1)==0) {
946 v->gshift++;
947 gmask = gmask >> 1;
948 }
949
950 /* Compute blue multiplier (mask) and bit shift */
951 v->bshift = 0;
952 bmask = GET_BLUEMASK(v);
953 while ((bmask & 1)==0) {
954 v->bshift++;
955 bmask = bmask >> 1;
956 }
957
958 /*
959 * Compute component-to-pixel lookup tables and dithering kernel
960 */
961 {
962 static GLubyte kernel[16] = {
963 0*16, 8*16, 2*16, 10*16,
964 12*16, 4*16, 14*16, 6*16,
965 3*16, 11*16, 1*16, 9*16,
966 15*16, 7*16, 13*16, 5*16,
967 };
968 GLint rBits = _mesa_bitcount(rmask);
969 GLint gBits = _mesa_bitcount(gmask);
970 GLint bBits = _mesa_bitcount(bmask);
971 GLint maxBits;
972 GLuint i;
973
974 /* convert pixel components in [0,_mask] to RGB values in [0,255] */
975 for (i=0; i<=rmask; i++)
976 v->PixelToR[i] = (unsigned char) ((i * 255) / rmask);
977 for (i=0; i<=gmask; i++)
978 v->PixelToG[i] = (unsigned char) ((i * 255) / gmask);
979 for (i=0; i<=bmask; i++)
980 v->PixelToB[i] = (unsigned char) ((i * 255) / bmask);
981
982 /* convert RGB values from [0,255] to pixel components */
983
984 for (i=0;i<256;i++) {
985 GLint r = gamma_adjust(v->RedGamma, i, 255);
986 GLint g = gamma_adjust(v->GreenGamma, i, 255);
987 GLint b = gamma_adjust(v->BlueGamma, i, 255);
988 v->RtoPixel[i] = (r >> (8-rBits)) << v->rshift;
989 v->GtoPixel[i] = (g >> (8-gBits)) << v->gshift;
990 v->BtoPixel[i] = (b >> (8-bBits)) << v->bshift;
991 }
992 /* overflow protection */
993 for (i=256;i<512;i++) {
994 v->RtoPixel[i] = v->RtoPixel[255];
995 v->GtoPixel[i] = v->GtoPixel[255];
996 v->BtoPixel[i] = v->BtoPixel[255];
997 }
998
999 /* setup dithering kernel */
1000 maxBits = rBits;
1001 if (gBits > maxBits) maxBits = gBits;
1002 if (bBits > maxBits) maxBits = bBits;
1003 for (i=0;i<16;i++) {
1004 v->Kernel[i] = kernel[i] >> maxBits;
1005 }
1006
1007 v->undithered_pf = PF_Truecolor;
1008 v->dithered_pf = (GET_VISUAL_DEPTH(v)<24) ? PF_Dither_True : PF_Truecolor;
1009 }
1010
1011 /*
1012 * Now check for TrueColor visuals which we can optimize.
1013 */
1014 if ( GET_REDMASK(v) ==0x0000ff
1015 && GET_GREENMASK(v)==0x00ff00
1016 && GET_BLUEMASK(v) ==0xff0000
1017 && CHECK_BYTE_ORDER(v)
1018 && v->BitsPerPixel==32
1019 && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
1020 /* common 32 bpp config used on SGI, Sun */
1021 v->undithered_pf = v->dithered_pf = PF_8A8B8G8R; /* ABGR */
1022 }
1023 else if (GET_REDMASK(v) == 0xff0000
1024 && GET_GREENMASK(v)== 0x00ff00
1025 && GET_BLUEMASK(v) == 0x0000ff
1026 && CHECK_BYTE_ORDER(v)
1027 && v->RedGamma == 1.0 && v->GreenGamma == 1.0 && v->BlueGamma == 1.0){
1028 if (v->BitsPerPixel==32) {
1029 /* if 32 bpp, and visual indicates 8 bpp alpha channel */
1030 if (GET_VISUAL_DEPTH(v) == 32 && v->mesa_visual.alphaBits == 8)
1031 v->undithered_pf = v->dithered_pf = PF_8A8R8G8B; /* ARGB */
1032 else
1033 v->undithered_pf = v->dithered_pf = PF_8R8G8B; /* xRGB */
1034 }
1035 else if (v->BitsPerPixel == 24) {
1036 v->undithered_pf = v->dithered_pf = PF_8R8G8B24; /* RGB */
1037 }
1038 }
1039 else if (GET_REDMASK(v) ==0xf800
1040 && GET_GREENMASK(v)==0x07e0
1041 && GET_BLUEMASK(v) ==0x001f
1042 && CHECK_BYTE_ORDER(v)
1043 && v->BitsPerPixel==16
1044 && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
1045 /* 5-6-5 RGB */
1046 v->undithered_pf = PF_5R6G5B;
1047 v->dithered_pf = PF_Dither_5R6G5B;
1048 }
1049 else if (GET_REDMASK(v) ==0xe0
1050 && GET_GREENMASK(v)==0x1c
1051 && GET_BLUEMASK(v) ==0x03
1052 && CHECK_FOR_HPCR(v)) {
1053 /* 8-bit HP color recovery */
1054 setup_8bit_hpcr( v );
1055 }
1056 }
1057
1058
1059
1060 /**
1061 * Setup RGB rendering for a window with a monochrome visual.
1062 */
1063 static void
1064 setup_monochrome( XMesaVisual v, XMesaBuffer b )
1065 {
1066 (void) b;
1067 v->dithered_pf = v->undithered_pf = PF_1Bit;
1068 /* if black=1 then we must flip pixel values */
1069 v->bitFlip = (GET_BLACK_PIXEL(v) != 0);
1070 }
1071
1072
1073
1074 /**
1075 * When a context is bound for the first time, we can finally finish
1076 * initializing the context's visual and buffer information.
1077 * \param v the XMesaVisual to initialize
1078 * \param b the XMesaBuffer to initialize (may be NULL)
1079 * \param rgb_flag TRUE = RGBA mode, FALSE = color index mode
1080 * \param window the window/pixmap we're rendering into
1081 * \param cmap the colormap associated with the window/pixmap
1082 * \return GL_TRUE=success, GL_FALSE=failure
1083 */
1084 static GLboolean
1085 initialize_visual_and_buffer(XMesaVisual v, XMesaBuffer b,
1086 GLboolean rgb_flag, XMesaDrawable window,
1087 XMesaColormap cmap)
1088 {
1089 int client = 0;
1090
1091 #ifdef XFree86Server
1092 client = (window) ? CLIENT_ID(window->id) : 0;
1093 #endif
1094
1095 ASSERT(!b || b->xm_visual == v);
1096
1097 /* Save true bits/pixel */
1098 v->BitsPerPixel = bits_per_pixel(v);
1099 assert(v->BitsPerPixel > 0);
1100
1101 if (rgb_flag == GL_FALSE) {
1102 /* COLOR-INDEXED WINDOW:
1103 * Even if the visual is TrueColor or DirectColor we treat it as
1104 * being color indexed. This is weird but might be useful to someone.
1105 */
1106 v->dithered_pf = v->undithered_pf = PF_Index;
1107 v->mesa_visual.indexBits = GET_VISUAL_DEPTH(v);
1108 }
1109 else {
1110 /* RGB WINDOW:
1111 * We support RGB rendering into almost any kind of visual.
1112 */
1113 const int xclass = v->mesa_visual.visualType;
1114 if (xclass == GLX_TRUE_COLOR || xclass == GLX_DIRECT_COLOR) {
1115 setup_truecolor( v, b, cmap );
1116 }
1117 else if (xclass == GLX_STATIC_GRAY && GET_VISUAL_DEPTH(v) == 1) {
1118 setup_monochrome( v, b );
1119 }
1120 else if (xclass == GLX_GRAY_SCALE || xclass == GLX_STATIC_GRAY) {
1121 if (!setup_grayscale( client, v, b, cmap )) {
1122 return GL_FALSE;
1123 }
1124 }
1125 else if ((xclass == GLX_PSEUDO_COLOR || xclass == GLX_STATIC_COLOR)
1126 && GET_VISUAL_DEPTH(v)>=4 && GET_VISUAL_DEPTH(v)<=16) {
1127 if (!setup_dithered_color( client, v, b, cmap )) {
1128 return GL_FALSE;
1129 }
1130 }
1131 else {
1132 _mesa_warning(NULL, "XMesa: RGB mode rendering not supported in given visual.\n");
1133 return GL_FALSE;
1134 }
1135 v->mesa_visual.indexBits = 0;
1136
1137 if (_mesa_getenv("MESA_NO_DITHER")) {
1138 v->dithered_pf = v->undithered_pf;
1139 }
1140 }
1141
1142
1143 /*
1144 * If MESA_INFO env var is set print out some debugging info
1145 * which can help Brian figure out what's going on when a user
1146 * reports bugs.
1147 */
1148 if (_mesa_getenv("MESA_INFO")) {
1149 _mesa_printf("X/Mesa visual = %p\n", (void *) v);
1150 _mesa_printf("X/Mesa dithered pf = %u\n", v->dithered_pf);
1151 _mesa_printf("X/Mesa undithered pf = %u\n", v->undithered_pf);
1152 _mesa_printf("X/Mesa level = %d\n", v->mesa_visual.level);
1153 _mesa_printf("X/Mesa depth = %d\n", GET_VISUAL_DEPTH(v));
1154 _mesa_printf("X/Mesa bits per pixel = %d\n", v->BitsPerPixel);
1155 }
1156
1157 if (b && window) {
1158 char *data;
1159
1160 /* Do window-specific initializations */
1161
1162 /* these should have been set in create_xmesa_buffer */
1163 ASSERT(b->frontxrb->drawable == window);
1164 ASSERT(b->frontxrb->pixmap == (XMesaPixmap) window);
1165
1166 /* Setup for single/double buffering */
1167 if (v->mesa_visual.doubleBufferMode) {
1168 /* Double buffered */
1169 b->shm = check_for_xshm( v->display );
1170 }
1171
1172 /* X11 graphics contexts */
1173 #ifdef XFree86Server
1174 b->gc = CreateScratchGC(v->display, window->depth);
1175 #else
1176 b->gc = XCreateGC( v->display, window, 0, NULL );
1177 #endif
1178 XMesaSetFunction( v->display, b->gc, GXcopy );
1179
1180 /* cleargc - for glClear() */
1181 #ifdef XFree86Server
1182 b->cleargc = CreateScratchGC(v->display, window->depth);
1183 #else
1184 b->cleargc = XCreateGC( v->display, window, 0, NULL );
1185 #endif
1186 XMesaSetFunction( v->display, b->cleargc, GXcopy );
1187
1188 /*
1189 * Don't generate Graphics Expose/NoExpose events in swapbuffers().
1190 * Patch contributed by Michael Pichler May 15, 1995.
1191 */
1192 #ifdef XFree86Server
1193 b->swapgc = CreateScratchGC(v->display, window->depth);
1194 {
1195 CARD32 v[1];
1196 v[0] = FALSE;
1197 dixChangeGC(NullClient, b->swapgc, GCGraphicsExposures, v, NULL);
1198 }
1199 #else
1200 {
1201 XGCValues gcvalues;
1202 gcvalues.graphics_exposures = False;
1203 b->swapgc = XCreateGC(v->display, window,
1204 GCGraphicsExposures, &gcvalues);
1205 }
1206 #endif
1207 XMesaSetFunction( v->display, b->swapgc, GXcopy );
1208 /*
1209 * Set fill style and tile pixmap once for all for HPCR stuff
1210 * (instead of doing it each time in clear_color_HPCR_pixmap())
1211 * Initialize whole stuff
1212 * Patch contributed by Jacques Leroy March 8, 1998.
1213 */
1214 if (v->hpcr_clear_flag && b->backxrb && b->backxrb->pixmap) {
1215 int i;
1216 for (i = 0; i < 16; i++) {
1217 XMesaPutPixel(v->hpcr_clear_ximage, i, 0, 0);
1218 XMesaPutPixel(v->hpcr_clear_ximage, i, 1, 0);
1219 }
1220 XMesaPutImage(b->display, (XMesaDrawable) v->hpcr_clear_pixmap,
1221 b->cleargc, v->hpcr_clear_ximage, 0, 0, 0, 0, 16, 2);
1222 XMesaSetFillStyle( v->display, b->cleargc, FillTiled);
1223 XMesaSetTile( v->display, b->cleargc, v->hpcr_clear_pixmap );
1224 }
1225
1226 /* Initialize the row buffer XImage for use in write_color_span() */
1227 data = (char*) MALLOC(MAX_WIDTH*4);
1228 #ifdef XFree86Server
1229 b->rowimage = XMesaCreateImage(GET_VISUAL_DEPTH(v), MAX_WIDTH, 1, data);
1230 #else
1231 b->rowimage = XCreateImage( v->display,
1232 v->visinfo->visual,
1233 v->visinfo->depth,
1234 ZPixmap, 0, /*format, offset*/
1235 data, /*data*/
1236 MAX_WIDTH, 1, /*width, height*/
1237 32, /*bitmap_pad*/
1238 0 /*bytes_per_line*/ );
1239 #endif
1240 if (!b->rowimage)
1241 return GL_FALSE;
1242 }
1243
1244 return GL_TRUE;
1245 }
1246
1247
1248
1249 /*
1250 * Convert an RGBA color to a pixel value.
1251 */
1252 unsigned long
1253 xmesa_color_to_pixel(GLcontext *ctx,
1254 GLubyte r, GLubyte g, GLubyte b, GLubyte a,
1255 GLuint pixelFormat)
1256 {
1257 XMesaContext xmesa = XMESA_CONTEXT(ctx);
1258 switch (pixelFormat) {
1259 case PF_Index:
1260 return 0;
1261 case PF_Truecolor:
1262 {
1263 unsigned long p;
1264 PACK_TRUECOLOR( p, r, g, b );
1265 return p;
1266 }
1267 case PF_8A8B8G8R:
1268 return PACK_8A8B8G8R( r, g, b, a );
1269 case PF_8A8R8G8B:
1270 return PACK_8A8R8G8B( r, g, b, a );
1271 case PF_8R8G8B:
1272 /* fall through */
1273 case PF_8R8G8B24:
1274 return PACK_8R8G8B( r, g, b );
1275 case PF_5R6G5B:
1276 return PACK_5R6G5B( r, g, b );
1277 case PF_Dither:
1278 {
1279 DITHER_SETUP;
1280 return DITHER( 1, 0, r, g, b );
1281 }
1282 case PF_1Bit:
1283 /* 382 = (3*255)/2 */
1284 return ((r+g+b) > 382) ^ xmesa->xm_visual->bitFlip;
1285 case PF_HPCR:
1286 return DITHER_HPCR(1, 1, r, g, b);
1287 case PF_Lookup:
1288 {
1289 LOOKUP_SETUP;
1290 return LOOKUP( r, g, b );
1291 }
1292 case PF_Grayscale:
1293 return GRAY_RGB( r, g, b );
1294 case PF_Dither_True:
1295 /* fall through */
1296 case PF_Dither_5R6G5B:
1297 {
1298 unsigned long p;
1299 PACK_TRUEDITHER(p, 1, 0, r, g, b);
1300 return p;
1301 }
1302 default:
1303 _mesa_problem(ctx, "Bad pixel format in xmesa_color_to_pixel");
1304 }
1305 return 0;
1306 }
1307
1308
1309 #define NUM_VISUAL_TYPES 6
1310
1311 /**
1312 * Convert an X visual type to a GLX visual type.
1313 *
1314 * \param visualType X visual type (i.e., \c TrueColor, \c StaticGray, etc.)
1315 * to be converted.
1316 * \return If \c visualType is a valid X visual type, a GLX visual type will
1317 * be returned. Otherwise \c GLX_NONE will be returned.
1318 *
1319 * \note
1320 * This code was lifted directly from lib/GL/glx/glcontextmodes.c in the
1321 * DRI CVS tree.
1322 */
1323 static GLint
1324 xmesa_convert_from_x_visual_type( int visualType )
1325 {
1326 static const int glx_visual_types[ NUM_VISUAL_TYPES ] = {
1327 GLX_STATIC_GRAY, GLX_GRAY_SCALE,
1328 GLX_STATIC_COLOR, GLX_PSEUDO_COLOR,
1329 GLX_TRUE_COLOR, GLX_DIRECT_COLOR
1330 };
1331
1332 return ( (unsigned) visualType < NUM_VISUAL_TYPES )
1333 ? glx_visual_types[ visualType ] : GLX_NONE;
1334 }
1335
1336
1337 /**********************************************************************/
1338 /***** Public Functions *****/
1339 /**********************************************************************/
1340
1341
1342 /*
1343 * Create a new X/Mesa visual.
1344 * Input: display - X11 display
1345 * visinfo - an XVisualInfo pointer
1346 * rgb_flag - GL_TRUE = RGB mode,
1347 * GL_FALSE = color index mode
1348 * alpha_flag - alpha buffer requested?
1349 * db_flag - GL_TRUE = double-buffered,
1350 * GL_FALSE = single buffered
1351 * stereo_flag - stereo visual?
1352 * ximage_flag - GL_TRUE = use an XImage for back buffer,
1353 * GL_FALSE = use an off-screen pixmap for back buffer
1354 * depth_size - requested bits/depth values, or zero
1355 * stencil_size - requested bits/stencil values, or zero
1356 * accum_red_size - requested bits/red accum values, or zero
1357 * accum_green_size - requested bits/green accum values, or zero
1358 * accum_blue_size - requested bits/blue accum values, or zero
1359 * accum_alpha_size - requested bits/alpha accum values, or zero
1360 * num_samples - number of samples/pixel if multisampling, or zero
1361 * level - visual level, usually 0
1362 * visualCaveat - ala the GLX extension, usually GLX_NONE
1363 * Return; a new XMesaVisual or 0 if error.
1364 */
1365 PUBLIC
1366 XMesaVisual XMesaCreateVisual( XMesaDisplay *display,
1367 XMesaVisualInfo visinfo,
1368 GLboolean rgb_flag,
1369 GLboolean alpha_flag,
1370 GLboolean db_flag,
1371 GLboolean stereo_flag,
1372 GLboolean ximage_flag,
1373 GLint depth_size,
1374 GLint stencil_size,
1375 GLint accum_red_size,
1376 GLint accum_green_size,
1377 GLint accum_blue_size,
1378 GLint accum_alpha_size,
1379 GLint num_samples,
1380 GLint level,
1381 GLint visualCaveat )
1382 {
1383 char *gamma;
1384 XMesaVisual v;
1385 GLint red_bits, green_bits, blue_bits, alpha_bits;
1386
1387 #ifndef XFree86Server
1388 /* For debugging only */
1389 if (_mesa_getenv("MESA_XSYNC")) {
1390 /* This makes debugging X easier.
1391 * In your debugger, set a breakpoint on _XError to stop when an
1392 * X protocol error is generated.
1393 */
1394 XSynchronize( display, 1 );
1395 }
1396 #endif
1397
1398 v = (XMesaVisual) CALLOC_STRUCT(xmesa_visual);
1399 if (!v) {
1400 return NULL;
1401 }
1402
1403 v->display = display;
1404
1405 /* Save a copy of the XVisualInfo struct because the user may X_mesa_free()
1406 * the struct but we may need some of the information contained in it
1407 * at a later time.
1408 */
1409 #ifndef XFree86Server
1410 v->visinfo = (XVisualInfo *) MALLOC(sizeof(*visinfo));
1411 if(!v->visinfo) {
1412 _mesa_free(v);
1413 return NULL;
1414 }
1415 MEMCPY(v->visinfo, visinfo, sizeof(*visinfo));
1416 #endif
1417
1418 /* check for MESA_GAMMA environment variable */
1419 gamma = _mesa_getenv("MESA_GAMMA");
1420 if (gamma) {
1421 v->RedGamma = v->GreenGamma = v->BlueGamma = 0.0;
1422 sscanf( gamma, "%f %f %f", &v->RedGamma, &v->GreenGamma, &v->BlueGamma );
1423 if (v->RedGamma<=0.0) v->RedGamma = 1.0;
1424 if (v->GreenGamma<=0.0) v->GreenGamma = v->RedGamma;
1425 if (v->BlueGamma<=0.0) v->BlueGamma = v->RedGamma;
1426 }
1427 else {
1428 v->RedGamma = v->GreenGamma = v->BlueGamma = 1.0;
1429 }
1430
1431 v->ximage_flag = ximage_flag;
1432
1433 #ifdef XFree86Server
1434 /* We could calculate these values by ourselves. nplanes is either the sum
1435 * of the red, green, and blue bits or the number index bits.
1436 * ColormapEntries is either (1U << index_bits) or
1437 * (1U << max(redBits, greenBits, blueBits)).
1438 */
1439 assert(visinfo->nplanes > 0);
1440 v->nplanes = visinfo->nplanes;
1441 v->ColormapEntries = visinfo->ColormapEntries;
1442
1443 v->mesa_visual.redMask = visinfo->redMask;
1444 v->mesa_visual.greenMask = visinfo->greenMask;
1445 v->mesa_visual.blueMask = visinfo->blueMask;
1446 v->mesa_visual.visualID = visinfo->vid;
1447 v->mesa_visual.screen = 0; /* FIXME: What should be done here? */
1448 #else
1449 v->mesa_visual.redMask = visinfo->red_mask;
1450 v->mesa_visual.greenMask = visinfo->green_mask;
1451 v->mesa_visual.blueMask = visinfo->blue_mask;
1452 v->mesa_visual.visualID = visinfo->visualid;
1453 v->mesa_visual.screen = visinfo->screen;
1454 #endif
1455
1456 #if defined(XFree86Server) || !(defined(__cplusplus) || defined(c_plusplus))
1457 v->mesa_visual.visualType = xmesa_convert_from_x_visual_type(visinfo->class);
1458 #else
1459 v->mesa_visual.visualType = xmesa_convert_from_x_visual_type(visinfo->c_class);
1460 #endif
1461
1462 v->mesa_visual.visualRating = visualCaveat;
1463
1464 if (alpha_flag)
1465 v->mesa_visual.alphaBits = 8;
1466
1467 (void) initialize_visual_and_buffer( v, NULL, rgb_flag, 0, 0 );
1468
1469 {
1470 const int xclass = v->mesa_visual.visualType;
1471 if (xclass == GLX_TRUE_COLOR || xclass == GLX_DIRECT_COLOR) {
1472 red_bits = _mesa_bitcount(GET_REDMASK(v));
1473 green_bits = _mesa_bitcount(GET_GREENMASK(v));
1474 blue_bits = _mesa_bitcount(GET_BLUEMASK(v));
1475 }
1476 else {
1477 /* this is an approximation */
1478 int depth;
1479 depth = GET_VISUAL_DEPTH(v);
1480 red_bits = depth / 3;
1481 depth -= red_bits;
1482 green_bits = depth / 2;
1483 depth -= green_bits;
1484 blue_bits = depth;
1485 alpha_bits = 0;
1486 assert( red_bits + green_bits + blue_bits == GET_VISUAL_DEPTH(v) );
1487 }
1488 alpha_bits = v->mesa_visual.alphaBits;
1489 }
1490
1491 _mesa_initialize_visual( &v->mesa_visual,
1492 rgb_flag, db_flag, stereo_flag,
1493 red_bits, green_bits,
1494 blue_bits, alpha_bits,
1495 v->mesa_visual.indexBits,
1496 depth_size,
1497 stencil_size,
1498 accum_red_size, accum_green_size,
1499 accum_blue_size, accum_alpha_size,
1500 0 );
1501
1502 /* XXX minor hack */
1503 v->mesa_visual.level = level;
1504 return v;
1505 }
1506
1507
1508 PUBLIC
1509 void XMesaDestroyVisual( XMesaVisual v )
1510 {
1511 #ifndef XFree86Server
1512 _mesa_free(v->visinfo);
1513 #endif
1514 _mesa_free(v);
1515 }
1516
1517
1518
1519 /**
1520 * Create a new XMesaContext.
1521 * \param v the XMesaVisual
1522 * \param share_list another XMesaContext with which to share display
1523 * lists or NULL if no sharing is wanted.
1524 * \return an XMesaContext or NULL if error.
1525 */
1526 PUBLIC
1527 XMesaContext XMesaCreateContext( XMesaVisual v, XMesaContext share_list )
1528 {
1529 static GLboolean firstTime = GL_TRUE;
1530 XMesaContext c;
1531 GLcontext *mesaCtx;
1532 struct dd_function_table functions;
1533 #if 0
1534 TNLcontext *tnl;
1535 #endif
1536
1537 if (firstTime) {
1538 _glthread_INIT_MUTEX(_xmesa_lock);
1539 firstTime = GL_FALSE;
1540 }
1541
1542 /* Note: the XMesaContext contains a Mesa GLcontext struct (inheritance) */
1543 c = (XMesaContext) CALLOC_STRUCT(xmesa_context);
1544 if (!c)
1545 return NULL;
1546
1547 mesaCtx = &(c->mesa);
1548
1549 /* initialize with default driver functions, then plug in XMesa funcs */
1550 _mesa_init_driver_functions(&functions);
1551 xmesa_init_driver_functions(v, &functions);
1552 st_init_driver_functions(&functions);
1553
1554 /*
1555 functions.NewRenderbuffer = xmesa_new_renderbuffer;
1556 */
1557
1558 if (!_mesa_initialize_context(mesaCtx, &v->mesa_visual,
1559 share_list ? &(share_list->mesa) : (GLcontext *) NULL,
1560 &functions, (void *) c)) {
1561 _mesa_free(c);
1562 return NULL;
1563 }
1564
1565 _mesa_enable_sw_extensions(mesaCtx);
1566 _mesa_enable_1_3_extensions(mesaCtx);
1567 _mesa_enable_1_4_extensions(mesaCtx);
1568 _mesa_enable_1_5_extensions(mesaCtx);
1569 _mesa_enable_2_0_extensions(mesaCtx);
1570 #if ENABLE_EXT_texure_compression_s3tc
1571 if (c->Mesa_DXTn) {
1572 _mesa_enable_extension(mesaCtx, "GL_EXT_texture_compression_s3tc");
1573 _mesa_enable_extension(mesaCtx, "GL_S3_s3tc");
1574 }
1575 _mesa_enable_extension(mesaCtx, "GL_3DFX_texture_compression_FXT1");
1576 #endif
1577 #if ENABLE_EXT_timer_query
1578 _mesa_enable_extension(mesaCtx, "GL_EXT_timer_query");
1579 #endif
1580
1581 #ifdef XFree86Server
1582 /* If we're running in the X server, do bounds checking to prevent
1583 * segfaults and server crashes!
1584 */
1585 mesaCtx->Const.CheckArrayBounds = GL_TRUE;
1586 #endif
1587
1588 /* finish up xmesa context initializations */
1589 c->swapbytes = CHECK_BYTE_ORDER(v) ? GL_FALSE : GL_TRUE;
1590 c->xm_visual = v;
1591 c->xm_buffer = NULL; /* set later by XMesaMakeCurrent */
1592 c->display = v->display;
1593 c->pixelformat = v->dithered_pf; /* Dithering is enabled by default */
1594
1595 /* Initialize the software rasterizer and helper modules.
1596 */
1597 if (!_swrast_CreateContext( mesaCtx ) ||
1598 #if 0
1599 !_vbo_CreateContext( mesaCtx ) ||
1600 !_tnl_CreateContext( mesaCtx ) ||
1601 #endif
1602 !_swsetup_CreateContext( mesaCtx )) {
1603 _mesa_free_context_data(&c->mesa);
1604 _mesa_free(c);
1605 return NULL;
1606 }
1607
1608 #if 0
1609 /* tnl setup */
1610 tnl = TNL_CONTEXT(mesaCtx);
1611 tnl->Driver.RunPipeline = _tnl_run_pipeline;
1612 #endif
1613
1614 /* swrast setup */
1615 xmesa_register_swrast_functions( mesaCtx );
1616 _swsetup_Wakeup(mesaCtx);
1617
1618
1619 st_create_context( mesaCtx,
1620 xmesa_create_softpipe( c ) );
1621
1622 /* override these functions, as if the xlib driver were derived from
1623 * the softpipe driver.
1624 */
1625 #if 0
1626 mesaCtx->st->pipe->surface_alloc = xmesa_surface_alloc;
1627 #endif
1628 mesaCtx->st->pipe->is_format_supported = xmesa_is_format_supported;
1629 mesaCtx->st->pipe->get_tile_rgba = xmesa_get_tile_rgba;
1630 mesaCtx->st->pipe->put_tile_rgba = xmesa_put_tile_rgba;
1631
1632 mesaCtx->st->haveFramebufferRegions = GL_FALSE;
1633
1634 /* special pipe->clear function */
1635 mesaCtx->st->pipe->clear = xmesa_clear;
1636
1637 return c;
1638 }
1639
1640
1641
1642 PUBLIC
1643 void XMesaDestroyContext( XMesaContext c )
1644 {
1645 GLcontext *mesaCtx = &c->mesa;
1646
1647 #ifdef FX
1648 FXdestroyContext( XMESA_BUFFER(mesaCtx->DrawBuffer) );
1649 #endif
1650
1651 _swsetup_DestroyContext( mesaCtx );
1652 _swrast_DestroyContext( mesaCtx );
1653 #if 0
1654 _tnl_DestroyContext( mesaCtx );
1655 _vbo_DestroyContext( mesaCtx );
1656 #endif
1657 _mesa_free_context_data( mesaCtx );
1658 _mesa_free( c );
1659 }
1660
1661
1662
1663 /**
1664 * Private function for creating an XMesaBuffer which corresponds to an
1665 * X window or pixmap.
1666 * \param v the window's XMesaVisual
1667 * \param w the window we're wrapping
1668 * \return new XMesaBuffer or NULL if error
1669 */
1670 PUBLIC XMesaBuffer
1671 XMesaCreateWindowBuffer(XMesaVisual v, XMesaWindow w)
1672 {
1673 #ifndef XFree86Server
1674 XWindowAttributes attr;
1675 #endif
1676 XMesaBuffer b;
1677 XMesaColormap cmap;
1678 int depth;
1679
1680 assert(v);
1681 assert(w);
1682
1683 /* Check that window depth matches visual depth */
1684 #ifdef XFree86Server
1685 depth = ((XMesaDrawable)w)->depth;
1686 #else
1687 XGetWindowAttributes( v->display, w, &attr );
1688 depth = attr.depth;
1689 #endif
1690 if (GET_VISUAL_DEPTH(v) != depth) {
1691 _mesa_warning(NULL, "XMesaCreateWindowBuffer: depth mismatch between visual (%d) and window (%d)!\n",
1692 GET_VISUAL_DEPTH(v), depth);
1693 return NULL;
1694 }
1695
1696 /* Find colormap */
1697 #ifdef XFree86Server
1698 cmap = (ColormapPtr)LookupIDByType(wColormap(w), RT_COLORMAP);
1699 #else
1700 if (attr.colormap) {
1701 cmap = attr.colormap;
1702 }
1703 else {
1704 _mesa_warning(NULL, "Window %u has no colormap!\n", (unsigned int) w);
1705 /* this is weird, a window w/out a colormap!? */
1706 /* OK, let's just allocate a new one and hope for the best */
1707 cmap = XCreateColormap(v->display, w, attr.visual, AllocNone);
1708 }
1709 #endif
1710
1711 b = create_xmesa_buffer((XMesaDrawable) w, WINDOW, v, cmap);
1712 if (!b)
1713 return NULL;
1714
1715 if (!initialize_visual_and_buffer( v, b, v->mesa_visual.rgbMode,
1716 (XMesaDrawable) w, cmap )) {
1717 xmesa_free_buffer(b);
1718 return NULL;
1719 }
1720
1721 return b;
1722 }
1723
1724
1725
1726 /**
1727 * Create a new XMesaBuffer from an X pixmap.
1728 *
1729 * \param v the XMesaVisual
1730 * \param p the pixmap
1731 * \param cmap the colormap, may be 0 if using a \c GLX_TRUE_COLOR or
1732 * \c GLX_DIRECT_COLOR visual for the pixmap
1733 * \returns new XMesaBuffer or NULL if error
1734 */
1735 PUBLIC XMesaBuffer
1736 XMesaCreatePixmapBuffer(XMesaVisual v, XMesaPixmap p, XMesaColormap cmap)
1737 {
1738 XMesaBuffer b;
1739
1740 assert(v);
1741
1742 b = create_xmesa_buffer((XMesaDrawable) p, PIXMAP, v, cmap);
1743 if (!b)
1744 return NULL;
1745
1746 if (!initialize_visual_and_buffer(v, b, v->mesa_visual.rgbMode,
1747 (XMesaDrawable) p, cmap)) {
1748 xmesa_free_buffer(b);
1749 return NULL;
1750 }
1751
1752 return b;
1753 }
1754
1755
1756 /**
1757 * For GLX_EXT_texture_from_pixmap
1758 */
1759 XMesaBuffer
1760 XMesaCreatePixmapTextureBuffer(XMesaVisual v, XMesaPixmap p,
1761 XMesaColormap cmap,
1762 int format, int target, int mipmap)
1763 {
1764 GET_CURRENT_CONTEXT(ctx);
1765 XMesaBuffer b;
1766 GLuint width, height;
1767
1768 assert(v);
1769
1770 b = create_xmesa_buffer((XMesaDrawable) p, PIXMAP, v, cmap);
1771 if (!b)
1772 return NULL;
1773
1774 /* get pixmap size, update framebuffer/renderbuffer dims */
1775 xmesa_get_window_size(v->display, b, &width, &height);
1776 _mesa_resize_framebuffer(NULL, &(b->mesa_buffer), width, height);
1777
1778 if (target == 0) {
1779 /* examine dims */
1780 if (ctx->Extensions.ARB_texture_non_power_of_two) {
1781 target = GLX_TEXTURE_2D_EXT;
1782 }
1783 else if ( _mesa_bitcount(width) == 1
1784 && _mesa_bitcount(height) == 1) {
1785 /* power of two size */
1786 if (height == 1) {
1787 target = GLX_TEXTURE_1D_EXT;
1788 }
1789 else {
1790 target = GLX_TEXTURE_2D_EXT;
1791 }
1792 }
1793 else if (ctx->Extensions.NV_texture_rectangle) {
1794 target = GLX_TEXTURE_RECTANGLE_EXT;
1795 }
1796 else {
1797 /* non power of two textures not supported */
1798 XMesaDestroyBuffer(b);
1799 return 0;
1800 }
1801 }
1802
1803 b->TextureTarget = target;
1804 b->TextureFormat = format;
1805 b->TextureMipmap = mipmap;
1806
1807 if (!initialize_visual_and_buffer(v, b, v->mesa_visual.rgbMode,
1808 (XMesaDrawable) p, cmap)) {
1809 xmesa_free_buffer(b);
1810 return NULL;
1811 }
1812
1813 return b;
1814 }
1815
1816
1817
1818 XMesaBuffer
1819 XMesaCreatePBuffer(XMesaVisual v, XMesaColormap cmap,
1820 unsigned int width, unsigned int height)
1821 {
1822 #ifndef XFree86Server
1823 XMesaWindow root;
1824 XMesaDrawable drawable; /* X Pixmap Drawable */
1825 XMesaBuffer b;
1826
1827 /* allocate pixmap for front buffer */
1828 root = RootWindow( v->display, v->visinfo->screen );
1829 drawable = XCreatePixmap(v->display, root, width, height,
1830 v->visinfo->depth);
1831 if (!drawable)
1832 return NULL;
1833
1834 b = create_xmesa_buffer(drawable, PBUFFER, v, cmap);
1835 if (!b)
1836 return NULL;
1837
1838 if (!initialize_visual_and_buffer(v, b, v->mesa_visual.rgbMode,
1839 drawable, cmap)) {
1840 xmesa_free_buffer(b);
1841 return NULL;
1842 }
1843
1844 return b;
1845 #else
1846 return 0;
1847 #endif
1848 }
1849
1850
1851
1852 /*
1853 * Deallocate an XMesaBuffer structure and all related info.
1854 */
1855 PUBLIC void
1856 XMesaDestroyBuffer(XMesaBuffer b)
1857 {
1858 xmesa_free_buffer(b);
1859 }
1860
1861
1862 /**
1863 * Query the current window size and update the corresponding GLframebuffer
1864 * and all attached renderbuffers.
1865 * Called when:
1866 * 1. the first time a buffer is bound to a context.
1867 * 2. from glViewport to poll for window size changes
1868 * 3. from the XMesaResizeBuffers() API function.
1869 * Note: it's possible (and legal) for xmctx to be NULL. That can happen
1870 * when resizing a buffer when no rendering context is bound.
1871 */
1872 void
1873 xmesa_check_and_update_buffer_size(XMesaContext xmctx, XMesaBuffer drawBuffer)
1874 {
1875 GLuint width, height;
1876 xmesa_get_window_size(drawBuffer->display, drawBuffer, &width, &height);
1877 if (drawBuffer->mesa_buffer.Width != width ||
1878 drawBuffer->mesa_buffer.Height != height) {
1879 GLcontext *ctx = xmctx ? &xmctx->mesa : NULL;
1880 _mesa_resize_framebuffer(ctx, &(drawBuffer->mesa_buffer), width, height);
1881 }
1882 drawBuffer->mesa_buffer.Initialized = GL_TRUE; /* XXX TEMPORARY? */
1883 }
1884
1885
1886 /*
1887 * Bind buffer b to context c and make c the current rendering context.
1888 */
1889 GLboolean XMesaMakeCurrent( XMesaContext c, XMesaBuffer b )
1890 {
1891 return XMesaMakeCurrent2( c, b, b );
1892 }
1893
1894
1895 /*
1896 * Bind buffer b to context c and make c the current rendering context.
1897 */
1898 PUBLIC
1899 GLboolean XMesaMakeCurrent2( XMesaContext c, XMesaBuffer drawBuffer,
1900 XMesaBuffer readBuffer )
1901 {
1902 if (c) {
1903 if (!drawBuffer || !readBuffer)
1904 return GL_FALSE; /* must specify buffers! */
1905
1906 if (&(c->mesa) == _mesa_get_current_context()
1907 && c->mesa.DrawBuffer == &drawBuffer->mesa_buffer
1908 && c->mesa.ReadBuffer == &readBuffer->mesa_buffer
1909 && XMESA_BUFFER(c->mesa.DrawBuffer)->wasCurrent) {
1910 /* same context and buffer, do nothing */
1911 return GL_TRUE;
1912 }
1913
1914 c->xm_buffer = drawBuffer;
1915
1916 #ifdef FX
1917 if (FXmakeCurrent( drawBuffer ))
1918 return GL_TRUE;
1919 #endif
1920
1921 /* Call this periodically to detect when the user has begun using
1922 * GL rendering from multiple threads.
1923 */
1924 _glapi_check_multithread();
1925
1926 xmesa_check_and_update_buffer_size(c, drawBuffer);
1927 if (readBuffer != drawBuffer)
1928 xmesa_check_and_update_buffer_size(c, readBuffer);
1929
1930 _mesa_make_current(&(c->mesa),
1931 &drawBuffer->mesa_buffer,
1932 &readBuffer->mesa_buffer);
1933
1934 if (c->xm_visual->mesa_visual.rgbMode) {
1935 /*
1936 * Must recompute and set these pixel values because colormap
1937 * can be different for different windows.
1938 */
1939 c->clearpixel = xmesa_color_to_pixel( &c->mesa,
1940 c->clearcolor[0],
1941 c->clearcolor[1],
1942 c->clearcolor[2],
1943 c->clearcolor[3],
1944 c->xm_visual->undithered_pf);
1945 XMesaSetForeground(c->display, drawBuffer->cleargc, c->clearpixel);
1946 }
1947
1948 /* Solution to Stephane Rehel's problem with glXReleaseBuffersMESA(): */
1949 drawBuffer->wasCurrent = GL_TRUE;
1950 }
1951 else {
1952 /* Detach */
1953 _mesa_make_current( NULL, NULL, NULL );
1954 }
1955 return GL_TRUE;
1956 }
1957
1958
1959 /*
1960 * Unbind the context c from its buffer.
1961 */
1962 GLboolean XMesaUnbindContext( XMesaContext c )
1963 {
1964 /* A no-op for XFree86 integration purposes */
1965 return GL_TRUE;
1966 }
1967
1968
1969 XMesaContext XMesaGetCurrentContext( void )
1970 {
1971 GET_CURRENT_CONTEXT(ctx);
1972 if (ctx) {
1973 XMesaContext xmesa = XMESA_CONTEXT(ctx);
1974 return xmesa;
1975 }
1976 else {
1977 return 0;
1978 }
1979 }
1980
1981
1982 XMesaBuffer XMesaGetCurrentBuffer( void )
1983 {
1984 GET_CURRENT_CONTEXT(ctx);
1985 if (ctx) {
1986 XMesaBuffer xmbuf = XMESA_BUFFER(ctx->DrawBuffer);
1987 return xmbuf;
1988 }
1989 else {
1990 return 0;
1991 }
1992 }
1993
1994
1995 /* New in Mesa 3.1 */
1996 XMesaBuffer XMesaGetCurrentReadBuffer( void )
1997 {
1998 GET_CURRENT_CONTEXT(ctx);
1999 if (ctx) {
2000 return XMESA_BUFFER(ctx->ReadBuffer);
2001 }
2002 else {
2003 return 0;
2004 }
2005 }
2006
2007
2008 #ifdef XFree86Server
2009 PUBLIC
2010 GLboolean XMesaForceCurrent(XMesaContext c)
2011 {
2012 if (c) {
2013 _glapi_set_dispatch(c->mesa.CurrentDispatch);
2014
2015 if (&(c->mesa) != _mesa_get_current_context()) {
2016 _mesa_make_current(&c->mesa, c->mesa.DrawBuffer, c->mesa.ReadBuffer);
2017 }
2018 }
2019 else {
2020 _mesa_make_current(NULL, NULL, NULL);
2021 }
2022 return GL_TRUE;
2023 }
2024
2025
2026 PUBLIC
2027 GLboolean XMesaLoseCurrent(XMesaContext c)
2028 {
2029 (void) c;
2030 _mesa_make_current(NULL, NULL, NULL);
2031 return GL_TRUE;
2032 }
2033
2034
2035 PUBLIC
2036 GLboolean XMesaCopyContext( XMesaContext xm_src, XMesaContext xm_dst, GLuint mask )
2037 {
2038 _mesa_copy_context(&xm_src->mesa, &xm_dst->mesa, mask);
2039 return GL_TRUE;
2040 }
2041 #endif /* XFree86Server */
2042
2043
2044 #ifndef FX
2045 GLboolean XMesaSetFXmode( GLint mode )
2046 {
2047 (void) mode;
2048 return GL_FALSE;
2049 }
2050 #endif
2051
2052
2053
2054 /*
2055 * Copy the back buffer to the front buffer. If there's no back buffer
2056 * this is a no-op.
2057 */
2058 PUBLIC
2059 void XMesaSwapBuffers( XMesaBuffer b )
2060 {
2061 GET_CURRENT_CONTEXT(ctx);
2062
2063 if (!b->backxrb) {
2064 /* single buffered */
2065 return;
2066 }
2067
2068 /* If we're swapping the buffer associated with the current context
2069 * we have to flush any pending rendering commands first.
2070 */
2071 if (ctx && ctx->DrawBuffer == &(b->mesa_buffer))
2072 _mesa_notifySwapBuffers(ctx);
2073
2074 if (b->db_mode) {
2075 #ifdef FX
2076 if (FXswapBuffers(b))
2077 return;
2078 #endif
2079 if (b->backxrb->ximage) {
2080 /* Copy Ximage (back buf) from client memory to server window */
2081 #if defined(USE_XSHM) && !defined(XFree86Server)
2082 if (b->shm) {
2083 /*_glthread_LOCK_MUTEX(_xmesa_lock);*/
2084 XShmPutImage( b->xm_visual->display, b->frontxrb->drawable,
2085 b->swapgc,
2086 b->backxrb->ximage, 0, 0,
2087 0, 0, b->mesa_buffer.Width, b->mesa_buffer.Height,
2088 False );
2089 /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/
2090 }
2091 else
2092 #endif
2093 {
2094 /*_glthread_LOCK_MUTEX(_xmesa_lock);*/
2095 XMesaPutImage( b->xm_visual->display, b->frontxrb->drawable,
2096 b->swapgc,
2097 b->backxrb->ximage, 0, 0,
2098 0, 0, b->mesa_buffer.Width, b->mesa_buffer.Height );
2099 /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/
2100 }
2101 }
2102 else if (b->backxrb->pixmap) {
2103 /* Copy pixmap (back buf) to window (front buf) on server */
2104 /*_glthread_LOCK_MUTEX(_xmesa_lock);*/
2105 XMesaCopyArea( b->xm_visual->display,
2106 b->backxrb->pixmap, /* source drawable */
2107 b->frontxrb->drawable, /* dest. drawable */
2108 b->swapgc,
2109 0, 0, b->mesa_buffer.Width, b->mesa_buffer.Height,
2110 0, 0 /* dest region */
2111 );
2112 /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/
2113 }
2114
2115 if (b->swAlpha)
2116 _mesa_copy_soft_alpha_renderbuffers(ctx, &b->mesa_buffer);
2117 }
2118 #if !defined(XFree86Server)
2119 XSync( b->xm_visual->display, False );
2120 #endif
2121 }
2122
2123
2124
2125 /*
2126 * Copy sub-region of back buffer to front buffer
2127 */
2128 void XMesaCopySubBuffer( XMesaBuffer b, int x, int y, int width, int height )
2129 {
2130 GET_CURRENT_CONTEXT(ctx);
2131
2132 /* If we're swapping the buffer associated with the current context
2133 * we have to flush any pending rendering commands first.
2134 */
2135 if (ctx && ctx->DrawBuffer == &(b->mesa_buffer))
2136 _mesa_notifySwapBuffers(ctx);
2137
2138 if (!b->backxrb) {
2139 /* single buffered */
2140 return;
2141 }
2142
2143 if (b->db_mode) {
2144 int yTop = b->mesa_buffer.Height - y - height;
2145 #ifdef FX
2146 if (FXswapBuffers(b))
2147 return;
2148 #endif
2149 if (b->backxrb->ximage) {
2150 /* Copy Ximage from host's memory to server's window */
2151 #if defined(USE_XSHM) && !defined(XFree86Server)
2152 if (b->shm) {
2153 /* XXX assuming width and height aren't too large! */
2154 XShmPutImage( b->xm_visual->display, b->frontxrb->drawable,
2155 b->swapgc,
2156 b->backxrb->ximage, x, yTop,
2157 x, yTop, width, height, False );
2158 /* wait for finished event??? */
2159 }
2160 else
2161 #endif
2162 {
2163 /* XXX assuming width and height aren't too large! */
2164 XMesaPutImage( b->xm_visual->display, b->frontxrb->drawable,
2165 b->swapgc,
2166 b->backxrb->ximage, x, yTop,
2167 x, yTop, width, height );
2168 }
2169 }
2170 else {
2171 /* Copy pixmap to window on server */
2172 XMesaCopyArea( b->xm_visual->display,
2173 b->backxrb->pixmap, /* source drawable */
2174 b->frontxrb->drawable, /* dest. drawable */
2175 b->swapgc,
2176 x, yTop, width, height, /* source region */
2177 x, yTop /* dest region */
2178 );
2179 }
2180 }
2181 }
2182
2183
2184 /*
2185 * Return a pointer to the XMesa backbuffer Pixmap or XImage. This function
2186 * is a way to get "under the hood" of X/Mesa so one can manipulate the
2187 * back buffer directly.
2188 * Output: pixmap - pointer to back buffer's Pixmap, or 0
2189 * ximage - pointer to back buffer's XImage, or NULL
2190 * Return: GL_TRUE = context is double buffered
2191 * GL_FALSE = context is single buffered
2192 */
2193 #ifndef XFree86Server
2194 GLboolean XMesaGetBackBuffer( XMesaBuffer b,
2195 XMesaPixmap *pixmap,
2196 XMesaImage **ximage )
2197 {
2198 if (b->db_mode) {
2199 if (pixmap)
2200 *pixmap = b->backxrb->pixmap;
2201 if (ximage)
2202 *ximage = b->backxrb->ximage;
2203 return GL_TRUE;
2204 }
2205 else {
2206 *pixmap = 0;
2207 *ximage = NULL;
2208 return GL_FALSE;
2209 }
2210 }
2211 #endif /* XFree86Server */
2212
2213
2214 /*
2215 * Return the depth buffer associated with an XMesaBuffer.
2216 * Input: b - the XMesa buffer handle
2217 * Output: width, height - size of buffer in pixels
2218 * bytesPerValue - bytes per depth value (2 or 4)
2219 * buffer - pointer to depth buffer values
2220 * Return: GL_TRUE or GL_FALSE to indicate success or failure.
2221 */
2222 GLboolean XMesaGetDepthBuffer( XMesaBuffer b, GLint *width, GLint *height,
2223 GLint *bytesPerValue, void **buffer )
2224 {
2225 struct gl_renderbuffer *rb
2226 = b->mesa_buffer.Attachment[BUFFER_DEPTH].Renderbuffer;
2227 if (!rb || !rb->Data) {
2228 *width = 0;
2229 *height = 0;
2230 *bytesPerValue = 0;
2231 *buffer = 0;
2232 return GL_FALSE;
2233 }
2234 else {
2235 *width = b->mesa_buffer.Width;
2236 *height = b->mesa_buffer.Height;
2237 *bytesPerValue = b->mesa_buffer.Visual.depthBits <= 16
2238 ? sizeof(GLushort) : sizeof(GLuint);
2239 *buffer = rb->Data;
2240 return GL_TRUE;
2241 }
2242 }
2243
2244
2245 void XMesaFlush( XMesaContext c )
2246 {
2247 if (c && c->xm_visual) {
2248 #ifdef XFree86Server
2249 /* NOT_NEEDED */
2250 #else
2251 XSync( c->xm_visual->display, False );
2252 #endif
2253 }
2254 }
2255
2256
2257
2258 const char *XMesaGetString( XMesaContext c, int name )
2259 {
2260 (void) c;
2261 if (name==XMESA_VERSION) {
2262 return "5.0";
2263 }
2264 else if (name==XMESA_EXTENSIONS) {
2265 return "";
2266 }
2267 else {
2268 return NULL;
2269 }
2270 }
2271
2272
2273
2274 XMesaBuffer XMesaFindBuffer( XMesaDisplay *dpy, XMesaDrawable d )
2275 {
2276 XMesaBuffer b;
2277 for (b=XMesaBufferList; b; b=b->Next) {
2278 if (b->frontxrb->drawable == d && b->display == dpy) {
2279 return b;
2280 }
2281 }
2282 return NULL;
2283 }
2284
2285
2286 /**
2287 * Free/destroy all XMesaBuffers associated with given display.
2288 */
2289 void xmesa_destroy_buffers_on_display(XMesaDisplay *dpy)
2290 {
2291 XMesaBuffer b, next;
2292 for (b = XMesaBufferList; b; b = next) {
2293 next = b->Next;
2294 if (b->display == dpy) {
2295 xmesa_free_buffer(b);
2296 }
2297 }
2298 }
2299
2300
2301 /*
2302 * Look for XMesaBuffers whose X window has been destroyed.
2303 * Deallocate any such XMesaBuffers.
2304 */
2305 void XMesaGarbageCollect( void )
2306 {
2307 XMesaBuffer b, next;
2308 for (b=XMesaBufferList; b; b=next) {
2309 next = b->Next;
2310 if (b->display && b->frontxrb->drawable && b->type == WINDOW) {
2311 #ifdef XFree86Server
2312 /* NOT_NEEDED */
2313 #else
2314 XSync(b->display, False);
2315 if (!window_exists( b->display, b->frontxrb->drawable )) {
2316 /* found a dead window, free the ancillary info */
2317 XMesaDestroyBuffer( b );
2318 }
2319 #endif
2320 }
2321 }
2322 }
2323
2324
2325 unsigned long XMesaDitherColor( XMesaContext xmesa, GLint x, GLint y,
2326 GLfloat red, GLfloat green,
2327 GLfloat blue, GLfloat alpha )
2328 {
2329 GLcontext *ctx = &xmesa->mesa;
2330 GLint r = (GLint) (red * 255.0F);
2331 GLint g = (GLint) (green * 255.0F);
2332 GLint b = (GLint) (blue * 255.0F);
2333 GLint a = (GLint) (alpha * 255.0F);
2334
2335 switch (xmesa->pixelformat) {
2336 case PF_Index:
2337 return 0;
2338 case PF_Truecolor:
2339 {
2340 unsigned long p;
2341 PACK_TRUECOLOR( p, r, g, b );
2342 return p;
2343 }
2344 case PF_8A8B8G8R:
2345 return PACK_8A8B8G8R( r, g, b, a );
2346 case PF_8A8R8G8B:
2347 return PACK_8A8R8G8B( r, g, b, a );
2348 case PF_8R8G8B:
2349 return PACK_8R8G8B( r, g, b );
2350 case PF_5R6G5B:
2351 return PACK_5R6G5B( r, g, b );
2352 case PF_Dither:
2353 {
2354 DITHER_SETUP;
2355 return DITHER( x, y, r, g, b );
2356 }
2357 case PF_1Bit:
2358 /* 382 = (3*255)/2 */
2359 return ((r+g+b) > 382) ^ xmesa->xm_visual->bitFlip;
2360 case PF_HPCR:
2361 return DITHER_HPCR(x, y, r, g, b);
2362 case PF_Lookup:
2363 {
2364 LOOKUP_SETUP;
2365 return LOOKUP( r, g, b );
2366 }
2367 case PF_Grayscale:
2368 return GRAY_RGB( r, g, b );
2369 case PF_Dither_5R6G5B:
2370 /* fall through */
2371 case PF_Dither_True:
2372 {
2373 unsigned long p;
2374 PACK_TRUEDITHER(p, x, y, r, g, b);
2375 return p;
2376 }
2377 default:
2378 _mesa_problem(NULL, "Bad pixel format in XMesaDitherColor");
2379 }
2380 return 0;
2381 }
2382
2383
2384 /*
2385 * This is typically called when the window size changes and we need
2386 * to reallocate the buffer's back/depth/stencil/accum buffers.
2387 */
2388 PUBLIC void
2389 XMesaResizeBuffers( XMesaBuffer b )
2390 {
2391 GET_CURRENT_CONTEXT(ctx);
2392 XMesaContext xmctx = XMESA_CONTEXT(ctx);
2393 if (!xmctx)
2394 return;
2395 xmesa_check_and_update_buffer_size(xmctx, b);
2396 }
2397
2398
2399 static GLint
2400 xbuffer_to_renderbuffer(int buffer)
2401 {
2402 assert(MAX_AUX_BUFFERS <= 4);
2403
2404 switch (buffer) {
2405 case GLX_FRONT_LEFT_EXT:
2406 return BUFFER_FRONT_LEFT;
2407 case GLX_FRONT_RIGHT_EXT:
2408 return BUFFER_FRONT_RIGHT;
2409 case GLX_BACK_LEFT_EXT:
2410 return BUFFER_BACK_LEFT;
2411 case GLX_BACK_RIGHT_EXT:
2412 return BUFFER_BACK_RIGHT;
2413 case GLX_AUX0_EXT:
2414 return BUFFER_AUX0;
2415 case GLX_AUX1_EXT:
2416 return BUFFER_AUX1;
2417 case GLX_AUX2_EXT:
2418 return BUFFER_AUX2;
2419 case GLX_AUX3_EXT:
2420 return BUFFER_AUX3;
2421 case GLX_AUX4_EXT:
2422 case GLX_AUX5_EXT:
2423 case GLX_AUX6_EXT:
2424 case GLX_AUX7_EXT:
2425 case GLX_AUX8_EXT:
2426 case GLX_AUX9_EXT:
2427 default:
2428 /* BadValue error */
2429 return -1;
2430 }
2431 }
2432
2433
2434 PUBLIC void
2435 XMesaBindTexImage(XMesaDisplay *dpy, XMesaBuffer drawable, int buffer,
2436 const int *attrib_list)
2437 {
2438 #if 0
2439 GET_CURRENT_CONTEXT(ctx);
2440 const GLuint unit = ctx->Texture.CurrentUnit;
2441 struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
2442 struct gl_texture_object *texObj;
2443 #endif
2444 struct gl_renderbuffer *rb;
2445 struct xmesa_renderbuffer *xrb;
2446 GLint b;
2447 XMesaImage *img = NULL;
2448 GLboolean freeImg = GL_FALSE;
2449
2450 b = xbuffer_to_renderbuffer(buffer);
2451 if (b < 0)
2452 return;
2453
2454 if (drawable->TextureFormat == GLX_TEXTURE_FORMAT_NONE_EXT)
2455 return; /* BadMatch error */
2456
2457 rb = drawable->mesa_buffer.Attachment[b].Renderbuffer;
2458 if (!rb) {
2459 /* invalid buffer */
2460 return;
2461 }
2462 xrb = xmesa_renderbuffer(rb);
2463
2464 #if 0
2465 switch (drawable->TextureTarget) {
2466 case GLX_TEXTURE_1D_EXT:
2467 texObj = texUnit->Current1D;
2468 break;
2469 case GLX_TEXTURE_2D_EXT:
2470 texObj = texUnit->Current2D;
2471 break;
2472 case GLX_TEXTURE_RECTANGLE_EXT:
2473 texObj = texUnit->CurrentRect;
2474 break;
2475 default:
2476 return; /* BadMatch error */
2477 }
2478 #endif
2479
2480 /*
2481 * The following is a quick and simple way to implement
2482 * BindTexImage. The better way is to write some new FetchTexel()
2483 * functions which would extract texels from XImages. We'd still
2484 * need to use GetImage when texturing from a Pixmap (front buffer)
2485 * but texturing from a back buffer (XImage) would avoid an image
2486 * copy.
2487 */
2488
2489 /* get XImage */
2490 if (xrb->pixmap) {
2491 img = XMesaGetImage(dpy, xrb->pixmap, 0, 0, rb->Width, rb->Height, ~0L,
2492 ZPixmap);
2493 freeImg = GL_TRUE;
2494 }
2495 else if (xrb->ximage) {
2496 img = xrb->ximage;
2497 }
2498
2499 /* store the XImage as a new texture image */
2500 if (img) {
2501 GLenum format, type, intFormat;
2502 if (img->bits_per_pixel == 32) {
2503 format = GL_BGRA;
2504 type = GL_UNSIGNED_BYTE;
2505 intFormat = GL_RGBA;
2506 }
2507 else if (img->bits_per_pixel == 24) {
2508 format = GL_BGR;
2509 type = GL_UNSIGNED_BYTE;
2510 intFormat = GL_RGB;
2511 }
2512 else if (img->bits_per_pixel == 16) {
2513 format = GL_BGR;
2514 type = GL_UNSIGNED_SHORT_5_6_5;
2515 intFormat = GL_RGB;
2516 }
2517 else {
2518 _mesa_problem(NULL, "Unexpected XImage format in XMesaBindTexImage");
2519 return;
2520 }
2521 if (drawable->TextureFormat == GLX_TEXTURE_FORMAT_RGBA_EXT) {
2522 intFormat = GL_RGBA;
2523 }
2524 else if (drawable->TextureFormat == GLX_TEXTURE_FORMAT_RGB_EXT) {
2525 intFormat = GL_RGB;
2526 }
2527
2528 _mesa_TexImage2D(GL_TEXTURE_2D, 0, intFormat, rb->Width, rb->Height, 0,
2529 format, type, img->data);
2530
2531 if (freeImg) {
2532 XMesaDestroyImage(img);
2533 }
2534 }
2535 }
2536
2537
2538
2539 PUBLIC void
2540 XMesaReleaseTexImage(XMesaDisplay *dpy, XMesaBuffer drawable, int buffer)
2541 {
2542 const GLint b = xbuffer_to_renderbuffer(buffer);
2543 if (b < 0)
2544 return;
2545
2546 /* no-op for now */
2547 }
2548