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Merge branch 'nouveau-import'
[mesa.git] / src / mesa / drivers / x11 / xm_api.c
1 /*
2 * Mesa 3-D graphics library
3 * Version: 6.5.2
4 *
5 * Copyright (C) 1999-2006 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 "swrast/swrast.h"
76 #include "swrast_setup/swrast_setup.h"
77 #include "array_cache/acache.h"
78 #include "tnl/tnl.h"
79 #include "tnl/t_context.h"
80 #include "tnl/t_pipeline.h"
81 #include "drivers/common/driverfuncs.h"
82
83 #ifdef XFree86Server
84 #include <GL/glxtokens.h>
85 #endif
86
87 /**
88 * Global X driver lock
89 */
90 _glthread_Mutex _xmesa_lock;
91
92
93
94 /**
95 * Lookup tables for HPCR pixel format:
96 */
97 static short hpcr_rgbTbl[3][256] = {
98 {
99 16, 16, 17, 17, 18, 18, 19, 19, 20, 20, 21, 21, 22, 22, 23, 23,
100 24, 24, 25, 25, 26, 26, 27, 27, 28, 28, 29, 29, 30, 30, 31, 31,
101 32, 32, 33, 33, 34, 34, 35, 35, 36, 36, 37, 37, 38, 38, 39, 39,
102 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
103 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
104 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
105 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95,
106 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111,
107 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127,
108 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143,
109 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159,
110 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175,
111 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191,
112 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207,
113 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223,
114 224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239
115 },
116 {
117 16, 16, 17, 17, 18, 18, 19, 19, 20, 20, 21, 21, 22, 22, 23, 23,
118 24, 24, 25, 25, 26, 26, 27, 27, 28, 28, 29, 29, 30, 30, 31, 31,
119 32, 32, 33, 33, 34, 34, 35, 35, 36, 36, 37, 37, 38, 38, 39, 39,
120 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
121 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
122 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
123 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95,
124 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111,
125 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127,
126 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143,
127 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159,
128 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175,
129 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191,
130 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207,
131 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223,
132 224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239
133 },
134 {
135 32, 32, 33, 33, 34, 34, 35, 35, 36, 36, 37, 37, 38, 38, 39, 39,
136 40, 40, 41, 41, 42, 42, 43, 43, 44, 44, 45, 45, 46, 46, 47, 47,
137 48, 48, 49, 49, 50, 50, 51, 51, 52, 52, 53, 53, 54, 54, 55, 55,
138 56, 56, 57, 57, 58, 58, 59, 59, 60, 60, 61, 61, 62, 62, 63, 63,
139 64, 64, 65, 65, 66, 66, 67, 67, 68, 68, 69, 69, 70, 70, 71, 71,
140 72, 72, 73, 73, 74, 74, 75, 75, 76, 76, 77, 77, 78, 78, 79, 79,
141 80, 80, 81, 81, 82, 82, 83, 83, 84, 84, 85, 85, 86, 86, 87, 87,
142 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95,
143 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111,
144 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127,
145 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143,
146 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159,
147 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175,
148 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191,
149 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207,
150 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223
151 }
152 };
153
154
155
156 /**********************************************************************/
157 /***** X Utility Functions *****/
158 /**********************************************************************/
159
160
161 /**
162 * Return the host's byte order as LSBFirst or MSBFirst ala X.
163 */
164 #ifndef XFree86Server
165 static int host_byte_order( void )
166 {
167 int i = 1;
168 char *cptr = (char *) &i;
169 return (*cptr==1) ? LSBFirst : MSBFirst;
170 }
171 #endif
172
173
174 /**
175 * Check if the X Shared Memory extension is available.
176 * Return: 0 = not available
177 * 1 = shared XImage support available
178 * 2 = shared Pixmap support available also
179 */
180 static int check_for_xshm( XMesaDisplay *display )
181 {
182 #if defined(XFree86Server)
183 return 0;
184 #elif defined(USE_XSHM)
185 int major, minor, ignore;
186 Bool pixmaps;
187
188 if (XQueryExtension( display, "MIT-SHM", &ignore, &ignore, &ignore )) {
189 if (XShmQueryVersion( display, &major, &minor, &pixmaps )==True) {
190 return (pixmaps==True) ? 2 : 1;
191 }
192 else {
193 return 0;
194 }
195 }
196 else {
197 return 0;
198 }
199 #else
200 /* No XSHM support */
201 return 0;
202 #endif
203 }
204
205
206 /**
207 * Apply gamma correction to an intensity value in [0..max]. Return the
208 * new intensity value.
209 */
210 static GLint
211 gamma_adjust( GLfloat gamma, GLint value, GLint max )
212 {
213 if (gamma == 1.0) {
214 return value;
215 }
216 else {
217 double x = (double) value / (double) max;
218 return IROUND_POS((GLfloat) max * _mesa_pow(x, 1.0F/gamma));
219 }
220 }
221
222
223
224 /**
225 * Return the true number of bits per pixel for XImages.
226 * For example, if we request a 24-bit deep visual we may actually need/get
227 * 32bpp XImages. This function returns the appropriate bpp.
228 * Input: dpy - the X display
229 * visinfo - desribes the visual to be used for XImages
230 * Return: true number of bits per pixel for XImages
231 */
232 static int
233 bits_per_pixel( XMesaVisual xmv )
234 {
235 #ifdef XFree86Server
236 const int depth = xmv->nplanes;
237 int i;
238 assert(depth > 0);
239 for (i = 0; i < screenInfo.numPixmapFormats; i++) {
240 if (screenInfo.formats[i].depth == depth)
241 return screenInfo.formats[i].bitsPerPixel;
242 }
243 return depth; /* should never get here, but this should be safe */
244 #else
245 XMesaDisplay *dpy = xmv->display;
246 XMesaVisualInfo visinfo = xmv->visinfo;
247 XMesaImage *img;
248 int bitsPerPixel;
249 /* Create a temporary XImage */
250 img = XCreateImage( dpy, visinfo->visual, visinfo->depth,
251 ZPixmap, 0, /*format, offset*/
252 (char*) MALLOC(8), /*data*/
253 1, 1, /*width, height*/
254 32, /*bitmap_pad*/
255 0 /*bytes_per_line*/
256 );
257 assert(img);
258 /* grab the bits/pixel value */
259 bitsPerPixel = img->bits_per_pixel;
260 /* free the XImage */
261 _mesa_free( img->data );
262 img->data = NULL;
263 XMesaDestroyImage( img );
264 return bitsPerPixel;
265 #endif
266 }
267
268
269
270 /*
271 * Determine if a given X window ID is valid (window exists).
272 * Do this by calling XGetWindowAttributes() for the window and
273 * checking if we catch an X error.
274 * Input: dpy - the display
275 * win - the window to check for existance
276 * Return: GL_TRUE - window exists
277 * GL_FALSE - window doesn't exist
278 */
279 #ifndef XFree86Server
280 static GLboolean WindowExistsFlag;
281
282 static int window_exists_err_handler( XMesaDisplay* dpy, XErrorEvent* xerr )
283 {
284 (void) dpy;
285 if (xerr->error_code == BadWindow) {
286 WindowExistsFlag = GL_FALSE;
287 }
288 return 0;
289 }
290
291 static GLboolean window_exists( XMesaDisplay *dpy, Window win )
292 {
293 XWindowAttributes wa;
294 int (*old_handler)( XMesaDisplay*, XErrorEvent* );
295 WindowExistsFlag = GL_TRUE;
296 old_handler = XSetErrorHandler(window_exists_err_handler);
297 XGetWindowAttributes( dpy, win, &wa ); /* dummy request */
298 XSetErrorHandler(old_handler);
299 return WindowExistsFlag;
300 }
301 #endif
302
303
304
305 /**
306 * Return the size of the window (or pixmap) that corresponds to the
307 * given XMesaBuffer.
308 * \param width returns width in pixels
309 * \param height returns height in pixels
310 */
311 void
312 xmesa_get_window_size(XMesaDisplay *dpy, XMesaBuffer b,
313 GLuint *width, GLuint *height)
314 {
315 #ifdef XFree86Server
316 *width = MIN2(b->frontxrb->drawable->width, MAX_WIDTH);
317 *height = MIN2(b->frontxrb->drawable->height, MAX_HEIGHT);
318 #else
319 Window root;
320 Status stat;
321 int xpos, ypos;
322 unsigned int w, h, bw, depth;
323
324 _glthread_LOCK_MUTEX(_xmesa_lock);
325 XSync(b->xm_visual->display, 0); /* added for Chromium */
326 stat = XGetGeometry(dpy, b->frontxrb->pixmap, &root, &xpos, &ypos,
327 &w, &h, &bw, &depth);
328 _glthread_UNLOCK_MUTEX(_xmesa_lock);
329
330 if (stat) {
331 *width = w;
332 *height = h;
333 }
334 else {
335 /* probably querying a window that's recently been destroyed */
336 _mesa_warning(NULL, "XGetGeometry failed!\n");
337 *width = *height = 1;
338 }
339 #endif
340 }
341
342
343
344 /**********************************************************************/
345 /***** Linked list of XMesaBuffers *****/
346 /**********************************************************************/
347
348 static XMesaBuffer XMesaBufferList = NULL;
349
350
351 /**
352 * Allocate a new XMesaBuffer object which corresponds to the given drawable.
353 * Note that XMesaBuffer is derived from GLframebuffer.
354 * The new XMesaBuffer will not have any size (Width=Height=0).
355 *
356 * \param d the corresponding X drawable (window or pixmap)
357 * \param type either WINDOW, PIXMAP or PBUFFER, describing d
358 * \param vis the buffer's visual
359 * \param cmap the window's colormap, if known.
360 * \return new XMesaBuffer or NULL if any problem
361 */
362 static XMesaBuffer
363 create_xmesa_buffer(XMesaDrawable d, BufferType type,
364 XMesaVisual vis, XMesaColormap cmap)
365 {
366 GLboolean swAlpha;
367 XMesaBuffer b;
368
369 ASSERT(type == WINDOW || type == PIXMAP || type == PBUFFER);
370
371 b = (XMesaBuffer) CALLOC_STRUCT(xmesa_buffer);
372 if (!b)
373 return NULL;
374
375 b->display = vis->display;
376 b->xm_visual = vis;
377 b->type = type;
378 b->cmap = cmap;
379
380 _mesa_initialize_framebuffer(&b->mesa_buffer, &vis->mesa_visual);
381
382 /*
383 * Front renderbuffer
384 */
385 b->frontxrb = xmesa_new_renderbuffer(NULL, 0, &vis->mesa_visual,
386 GL_FALSE);
387 if (!b->frontxrb) {
388 _mesa_free(b);
389 return NULL;
390 }
391 b->frontxrb->Parent = b;
392 b->frontxrb->drawable = d;
393 b->frontxrb->pixmap = (XMesaPixmap) d;
394 _mesa_add_renderbuffer(&b->mesa_buffer, BUFFER_FRONT_LEFT,
395 &b->frontxrb->Base);
396
397 /*
398 * Back renderbuffer
399 */
400 if (vis->mesa_visual.doubleBufferMode) {
401 b->backxrb = xmesa_new_renderbuffer(NULL, 0, &vis->mesa_visual,
402 GL_TRUE);
403 if (!b->backxrb) {
404 /* XXX free front xrb too */
405 _mesa_free(b);
406 return NULL;
407 }
408 b->backxrb->Parent = b;
409 /* determine back buffer implementation */
410 b->db_mode = vis->ximage_flag ? BACK_XIMAGE : BACK_PIXMAP;
411
412 _mesa_add_renderbuffer(&b->mesa_buffer, BUFFER_BACK_LEFT,
413 &b->backxrb->Base);
414 }
415
416 /*
417 * Software alpha planes
418 */
419 if (vis->mesa_visual.alphaBits > 0
420 && vis->undithered_pf != PF_8A8B8G8R
421 && vis->undithered_pf != PF_8A8R8G8B) {
422 /* Visual has alpha, but pixel format doesn't support it.
423 * We'll use an alpha renderbuffer wrapper.
424 */
425 swAlpha = GL_TRUE;
426 }
427 else {
428 swAlpha = GL_FALSE;
429 }
430
431 /*
432 * Other renderbuffer (depth, stencil, etc)
433 */
434 _mesa_add_soft_renderbuffers(&b->mesa_buffer,
435 GL_FALSE, /* color */
436 vis->mesa_visual.haveDepthBuffer,
437 vis->mesa_visual.haveStencilBuffer,
438 vis->mesa_visual.haveAccumBuffer,
439 swAlpha,
440 vis->mesa_visual.numAuxBuffers > 0 );
441
442 /* insert buffer into linked list */
443 b->Next = XMesaBufferList;
444 XMesaBufferList = b;
445
446 return b;
447 }
448
449
450 /**
451 * Find an XMesaBuffer by matching X display and colormap but NOT matching
452 * the notThis buffer.
453 */
454 static XMesaBuffer
455 find_xmesa_buffer(XMesaDisplay *dpy, XMesaColormap cmap, XMesaBuffer notThis)
456 {
457 XMesaBuffer b;
458 for (b=XMesaBufferList; b; b=b->Next) {
459 if (b->display==dpy && b->cmap==cmap && b!=notThis) {
460 return b;
461 }
462 }
463 return NULL;
464 }
465
466
467 /**
468 * Free an XMesaBuffer, remove from linked list, perhaps free X colormap
469 * entries.
470 */
471 static void
472 free_xmesa_buffer(int client, XMesaBuffer buffer)
473 {
474 XMesaBuffer prev = NULL, b;
475 (void) client;
476 for (b=XMesaBufferList; b; b=b->Next) {
477 if (b==buffer) {
478 /* unlink bufer from list */
479 if (prev)
480 prev->Next = buffer->Next;
481 else
482 XMesaBufferList = buffer->Next;
483 /* Check to free X colors */
484 if (buffer->num_alloced>0) {
485 /* If no other buffer uses this X colormap then free the colors. */
486 if (!find_xmesa_buffer(buffer->display, buffer->cmap, buffer)) {
487 #ifdef XFree86Server
488 (void)FreeColors(buffer->cmap, client,
489 buffer->num_alloced, buffer->alloced_colors,
490 0);
491 #else
492 XFreeColors(buffer->display, buffer->cmap,
493 buffer->alloced_colors, buffer->num_alloced, 0);
494 #endif
495 }
496 }
497
498 _mesa_free_framebuffer_data(&buffer->mesa_buffer);
499 _mesa_free(buffer);
500
501 return;
502 }
503 /* continue search */
504 prev = b;
505 }
506 /* buffer not found in XMesaBufferList */
507 _mesa_problem(NULL,"free_xmesa_buffer() - buffer not found\n");
508 }
509
510
511 /**
512 * Copy X color table stuff from one XMesaBuffer to another.
513 */
514 static void
515 copy_colortable_info(XMesaBuffer dst, const XMesaBuffer src)
516 {
517 MEMCPY(dst->color_table, src->color_table, sizeof(src->color_table));
518 MEMCPY(dst->pixel_to_r, src->pixel_to_r, sizeof(src->pixel_to_r));
519 MEMCPY(dst->pixel_to_g, src->pixel_to_g, sizeof(src->pixel_to_g));
520 MEMCPY(dst->pixel_to_b, src->pixel_to_b, sizeof(src->pixel_to_b));
521 dst->num_alloced = src->num_alloced;
522 MEMCPY(dst->alloced_colors, src->alloced_colors,
523 sizeof(src->alloced_colors));
524 }
525
526
527
528 /**********************************************************************/
529 /***** Misc Private Functions *****/
530 /**********************************************************************/
531
532
533 /**
534 * A replacement for XAllocColor. This function should never
535 * fail to allocate a color. When XAllocColor fails, we return
536 * the nearest matching color. If we have to allocate many colors
537 * this function isn't too efficient; the XQueryColors() could be
538 * done just once.
539 * Written by Michael Pichler, Brian Paul, Mark Kilgard
540 * Input: dpy - X display
541 * cmap - X colormap
542 * cmapSize - size of colormap
543 * In/Out: color - the XColor struct
544 * Output: exact - 1=exact color match, 0=closest match
545 * alloced - 1=XAlloc worked, 0=XAlloc failed
546 */
547 static void
548 noFaultXAllocColor( int client,
549 XMesaDisplay *dpy,
550 XMesaColormap cmap,
551 int cmapSize,
552 XMesaColor *color,
553 int *exact, int *alloced )
554 {
555 #ifdef XFree86Server
556 Pixel *ppixIn;
557 xrgb *ctable;
558 #else
559 /* we'll try to cache ctable for better remote display performance */
560 static Display *prevDisplay = NULL;
561 static XMesaColormap prevCmap = 0;
562 static int prevCmapSize = 0;
563 static XMesaColor *ctable = NULL;
564 #endif
565 XMesaColor subColor;
566 int i, bestmatch;
567 double mindist; /* 3*2^16^2 exceeds long int precision. */
568
569 (void) client;
570
571 /* First try just using XAllocColor. */
572 #ifdef XFree86Server
573 if (AllocColor(cmap,
574 &color->red, &color->green, &color->blue,
575 &color->pixel,
576 client) == Success)
577 #else
578 if (XAllocColor(dpy, cmap, color))
579 #endif
580 {
581 *exact = 1;
582 *alloced = 1;
583 return;
584 }
585
586 /* Alloc failed, search for closest match */
587
588 /* Retrieve color table entries. */
589 /* XXX alloca candidate. */
590 #ifdef XFree86Server
591 ppixIn = (Pixel *) MALLOC(cmapSize * sizeof(Pixel));
592 ctable = (xrgb *) MALLOC(cmapSize * sizeof(xrgb));
593 for (i = 0; i < cmapSize; i++) {
594 ppixIn[i] = i;
595 }
596 QueryColors(cmap, cmapSize, ppixIn, ctable);
597 #else
598 if (prevDisplay != dpy || prevCmap != cmap
599 || prevCmapSize != cmapSize || !ctable) {
600 /* free previously cached color table */
601 if (ctable)
602 _mesa_free(ctable);
603 /* Get the color table from X */
604 ctable = (XMesaColor *) MALLOC(cmapSize * sizeof(XMesaColor));
605 assert(ctable);
606 for (i = 0; i < cmapSize; i++) {
607 ctable[i].pixel = i;
608 }
609 XQueryColors(dpy, cmap, ctable, cmapSize);
610 prevDisplay = dpy;
611 prevCmap = cmap;
612 prevCmapSize = cmapSize;
613 }
614 #endif
615
616 /* Find best match. */
617 bestmatch = -1;
618 mindist = 0.0;
619 for (i = 0; i < cmapSize; i++) {
620 double dr = 0.30 * ((double) color->red - (double) ctable[i].red);
621 double dg = 0.59 * ((double) color->green - (double) ctable[i].green);
622 double db = 0.11 * ((double) color->blue - (double) ctable[i].blue);
623 double dist = dr * dr + dg * dg + db * db;
624 if (bestmatch < 0 || dist < mindist) {
625 bestmatch = i;
626 mindist = dist;
627 }
628 }
629
630 /* Return result. */
631 subColor.red = ctable[bestmatch].red;
632 subColor.green = ctable[bestmatch].green;
633 subColor.blue = ctable[bestmatch].blue;
634 /* Try to allocate the closest match color. This should only
635 * fail if the cell is read/write. Otherwise, we're incrementing
636 * the cell's reference count.
637 */
638 #ifdef XFree86Server
639 if (AllocColor(cmap,
640 &subColor.red, &subColor.green, &subColor.blue,
641 &subColor.pixel,
642 client) == Success) {
643 #else
644 if (XAllocColor(dpy, cmap, &subColor)) {
645 #endif
646 *alloced = 1;
647 }
648 else {
649 /* do this to work around a problem reported by Frank Ortega */
650 subColor.pixel = (unsigned long) bestmatch;
651 subColor.red = ctable[bestmatch].red;
652 subColor.green = ctable[bestmatch].green;
653 subColor.blue = ctable[bestmatch].blue;
654 subColor.flags = DoRed | DoGreen | DoBlue;
655 *alloced = 0;
656 }
657 #ifdef XFree86Server
658 _mesa_free(ppixIn);
659 _mesa_free(ctable);
660 #else
661 /* don't free table, save it for next time */
662 #endif
663
664 *color = subColor;
665 *exact = 0;
666 }
667
668
669
670 /**
671 * Do setup for PF_GRAYSCALE pixel format.
672 * Note that buffer may be NULL.
673 */
674 static GLboolean
675 setup_grayscale(int client, XMesaVisual v,
676 XMesaBuffer buffer, XMesaColormap cmap)
677 {
678 if (GET_VISUAL_DEPTH(v)<4 || GET_VISUAL_DEPTH(v)>16) {
679 return GL_FALSE;
680 }
681
682 if (buffer) {
683 XMesaBuffer prevBuffer;
684
685 if (!cmap) {
686 return GL_FALSE;
687 }
688
689 prevBuffer = find_xmesa_buffer(v->display, cmap, buffer);
690 if (prevBuffer &&
691 (buffer->xm_visual->mesa_visual.rgbMode ==
692 prevBuffer->xm_visual->mesa_visual.rgbMode)) {
693 /* Copy colormap stuff from previous XMesaBuffer which uses same
694 * X colormap. Do this to avoid time spent in noFaultXAllocColor.
695 */
696 copy_colortable_info(buffer, prevBuffer);
697 }
698 else {
699 /* Allocate 256 shades of gray */
700 int gray;
701 int colorsfailed = 0;
702 for (gray=0;gray<256;gray++) {
703 GLint r = gamma_adjust( v->RedGamma, gray, 255 );
704 GLint g = gamma_adjust( v->GreenGamma, gray, 255 );
705 GLint b = gamma_adjust( v->BlueGamma, gray, 255 );
706 int exact, alloced;
707 XMesaColor xcol;
708 xcol.red = (r << 8) | r;
709 xcol.green = (g << 8) | g;
710 xcol.blue = (b << 8) | b;
711 noFaultXAllocColor( client, v->display,
712 cmap, GET_COLORMAP_SIZE(v),
713 &xcol, &exact, &alloced );
714 if (!exact) {
715 colorsfailed++;
716 }
717 if (alloced) {
718 assert(buffer->num_alloced<256);
719 buffer->alloced_colors[buffer->num_alloced] = xcol.pixel;
720 buffer->num_alloced++;
721 }
722
723 /*OLD
724 assert(gray < 576);
725 buffer->color_table[gray*3+0] = xcol.pixel;
726 buffer->color_table[gray*3+1] = xcol.pixel;
727 buffer->color_table[gray*3+2] = xcol.pixel;
728 assert(xcol.pixel < 65536);
729 buffer->pixel_to_r[xcol.pixel] = gray * 30 / 100;
730 buffer->pixel_to_g[xcol.pixel] = gray * 59 / 100;
731 buffer->pixel_to_b[xcol.pixel] = gray * 11 / 100;
732 */
733 buffer->color_table[gray] = xcol.pixel;
734 assert(xcol.pixel < 65536);
735 buffer->pixel_to_r[xcol.pixel] = gray;
736 buffer->pixel_to_g[xcol.pixel] = gray;
737 buffer->pixel_to_b[xcol.pixel] = gray;
738 }
739
740 if (colorsfailed && _mesa_getenv("MESA_DEBUG")) {
741 _mesa_warning(NULL,
742 "Note: %d out of 256 needed colors do not match exactly.\n",
743 colorsfailed );
744 }
745 }
746 }
747
748 v->dithered_pf = PF_Grayscale;
749 v->undithered_pf = PF_Grayscale;
750 return GL_TRUE;
751 }
752
753
754
755 /**
756 * Setup RGB rendering for a window with a PseudoColor, StaticColor,
757 * or 8-bit TrueColor visual visual. We try to allocate a palette of 225
758 * colors (5 red, 9 green, 5 blue) and dither to approximate a 24-bit RGB
759 * color. While this function was originally designed just for 8-bit
760 * visuals, it has also proven to work from 4-bit up to 16-bit visuals.
761 * Dithering code contributed by Bob Mercier.
762 */
763 static GLboolean
764 setup_dithered_color(int client, XMesaVisual v,
765 XMesaBuffer buffer, XMesaColormap cmap)
766 {
767 if (GET_VISUAL_DEPTH(v)<4 || GET_VISUAL_DEPTH(v)>16) {
768 return GL_FALSE;
769 }
770
771 if (buffer) {
772 XMesaBuffer prevBuffer;
773
774 if (!cmap) {
775 return GL_FALSE;
776 }
777
778 prevBuffer = find_xmesa_buffer(v->display, cmap, buffer);
779 if (prevBuffer &&
780 (buffer->xm_visual->mesa_visual.rgbMode ==
781 prevBuffer->xm_visual->mesa_visual.rgbMode)) {
782 /* Copy colormap stuff from previous, matching XMesaBuffer.
783 * Do this to avoid time spent in noFaultXAllocColor.
784 */
785 copy_colortable_info(buffer, prevBuffer);
786 }
787 else {
788 /* Allocate X colors and initialize color_table[], red_table[], etc */
789 int r, g, b, i;
790 int colorsfailed = 0;
791 for (r = 0; r < DITH_R; r++) {
792 for (g = 0; g < DITH_G; g++) {
793 for (b = 0; b < DITH_B; b++) {
794 XMesaColor xcol;
795 int exact, alloced;
796 xcol.red =gamma_adjust(v->RedGamma, r*65535/(DITH_R-1),65535);
797 xcol.green=gamma_adjust(v->GreenGamma, g*65535/(DITH_G-1),65535);
798 xcol.blue =gamma_adjust(v->BlueGamma, b*65535/(DITH_B-1),65535);
799 noFaultXAllocColor( client, v->display,
800 cmap, GET_COLORMAP_SIZE(v),
801 &xcol, &exact, &alloced );
802 if (!exact) {
803 colorsfailed++;
804 }
805 if (alloced) {
806 assert(buffer->num_alloced<256);
807 buffer->alloced_colors[buffer->num_alloced] = xcol.pixel;
808 buffer->num_alloced++;
809 }
810 i = DITH_MIX( r, g, b );
811 assert(i < 576);
812 buffer->color_table[i] = xcol.pixel;
813 assert(xcol.pixel < 65536);
814 buffer->pixel_to_r[xcol.pixel] = r * 255 / (DITH_R-1);
815 buffer->pixel_to_g[xcol.pixel] = g * 255 / (DITH_G-1);
816 buffer->pixel_to_b[xcol.pixel] = b * 255 / (DITH_B-1);
817 }
818 }
819 }
820
821 if (colorsfailed && _mesa_getenv("MESA_DEBUG")) {
822 _mesa_warning(NULL,
823 "Note: %d out of %d needed colors do not match exactly.\n",
824 colorsfailed, DITH_R * DITH_G * DITH_B );
825 }
826 }
827 }
828
829 v->dithered_pf = PF_Dither;
830 v->undithered_pf = PF_Lookup;
831 return GL_TRUE;
832 }
833
834
835 /**
836 * Setup for Hewlett Packard Color Recovery 8-bit TrueColor mode.
837 * HPCR simulates 24-bit color fidelity with an 8-bit frame buffer.
838 * Special dithering tables have to be initialized.
839 */
840 static void
841 setup_8bit_hpcr(XMesaVisual v)
842 {
843 /* HP Color Recovery contributed by: Alex De Bruyn (ad@lms.be)
844 * To work properly, the atom _HP_RGB_SMOOTH_MAP_LIST must be defined
845 * on the root window AND the colormap obtainable by XGetRGBColormaps
846 * for that atom must be set on the window. (see also tkInitWindow)
847 * If that colormap is not set, the output will look stripy.
848 */
849
850 /* Setup color tables with gamma correction */
851 int i;
852 double g;
853
854 g = 1.0 / v->RedGamma;
855 for (i=0; i<256; i++) {
856 GLint red = IROUND_POS(255.0 * _mesa_pow( hpcr_rgbTbl[0][i]/255.0, g ));
857 v->hpcr_rgbTbl[0][i] = CLAMP( red, 16, 239 );
858 }
859
860 g = 1.0 / v->GreenGamma;
861 for (i=0; i<256; i++) {
862 GLint green = IROUND_POS(255.0 * _mesa_pow( hpcr_rgbTbl[1][i]/255.0, g ));
863 v->hpcr_rgbTbl[1][i] = CLAMP( green, 16, 239 );
864 }
865
866 g = 1.0 / v->BlueGamma;
867 for (i=0; i<256; i++) {
868 GLint blue = IROUND_POS(255.0 * _mesa_pow( hpcr_rgbTbl[2][i]/255.0, g ));
869 v->hpcr_rgbTbl[2][i] = CLAMP( blue, 32, 223 );
870 }
871 v->undithered_pf = PF_HPCR; /* can't really disable dithering for now */
872 v->dithered_pf = PF_HPCR;
873
874 /* which method should I use to clear */
875 /* GL_FALSE: keep the ordinary method */
876 /* GL_TRUE : clear with dither pattern */
877 v->hpcr_clear_flag = _mesa_getenv("MESA_HPCR_CLEAR") ? GL_TRUE : GL_FALSE;
878
879 if (v->hpcr_clear_flag) {
880 v->hpcr_clear_pixmap = XMesaCreatePixmap(v->display,
881 DefaultRootWindow(v->display),
882 16, 2, 8);
883 #ifndef XFree86Server
884 v->hpcr_clear_ximage = XGetImage(v->display, v->hpcr_clear_pixmap,
885 0, 0, 16, 2, AllPlanes, ZPixmap);
886 #endif
887 }
888 }
889
890
891 /**
892 * Setup RGB rendering for a window with a True/DirectColor visual.
893 */
894 static void
895 setup_truecolor(XMesaVisual v, XMesaBuffer buffer, XMesaColormap cmap)
896 {
897 unsigned long rmask, gmask, bmask;
898 (void) buffer;
899 (void) cmap;
900
901 /* Compute red multiplier (mask) and bit shift */
902 v->rshift = 0;
903 rmask = GET_REDMASK(v);
904 while ((rmask & 1)==0) {
905 v->rshift++;
906 rmask = rmask >> 1;
907 }
908
909 /* Compute green multiplier (mask) and bit shift */
910 v->gshift = 0;
911 gmask = GET_GREENMASK(v);
912 while ((gmask & 1)==0) {
913 v->gshift++;
914 gmask = gmask >> 1;
915 }
916
917 /* Compute blue multiplier (mask) and bit shift */
918 v->bshift = 0;
919 bmask = GET_BLUEMASK(v);
920 while ((bmask & 1)==0) {
921 v->bshift++;
922 bmask = bmask >> 1;
923 }
924
925 /*
926 * Compute component-to-pixel lookup tables and dithering kernel
927 */
928 {
929 static GLubyte kernel[16] = {
930 0*16, 8*16, 2*16, 10*16,
931 12*16, 4*16, 14*16, 6*16,
932 3*16, 11*16, 1*16, 9*16,
933 15*16, 7*16, 13*16, 5*16,
934 };
935 GLint rBits = _mesa_bitcount(rmask);
936 GLint gBits = _mesa_bitcount(gmask);
937 GLint bBits = _mesa_bitcount(bmask);
938 GLint maxBits;
939 GLuint i;
940
941 /* convert pixel components in [0,_mask] to RGB values in [0,255] */
942 for (i=0; i<=rmask; i++)
943 v->PixelToR[i] = (unsigned char) ((i * 255) / rmask);
944 for (i=0; i<=gmask; i++)
945 v->PixelToG[i] = (unsigned char) ((i * 255) / gmask);
946 for (i=0; i<=bmask; i++)
947 v->PixelToB[i] = (unsigned char) ((i * 255) / bmask);
948
949 /* convert RGB values from [0,255] to pixel components */
950
951 for (i=0;i<256;i++) {
952 GLint r = gamma_adjust(v->RedGamma, i, 255);
953 GLint g = gamma_adjust(v->GreenGamma, i, 255);
954 GLint b = gamma_adjust(v->BlueGamma, i, 255);
955 v->RtoPixel[i] = (r >> (8-rBits)) << v->rshift;
956 v->GtoPixel[i] = (g >> (8-gBits)) << v->gshift;
957 v->BtoPixel[i] = (b >> (8-bBits)) << v->bshift;
958 }
959 /* overflow protection */
960 for (i=256;i<512;i++) {
961 v->RtoPixel[i] = v->RtoPixel[255];
962 v->GtoPixel[i] = v->GtoPixel[255];
963 v->BtoPixel[i] = v->BtoPixel[255];
964 }
965
966 /* setup dithering kernel */
967 maxBits = rBits;
968 if (gBits > maxBits) maxBits = gBits;
969 if (bBits > maxBits) maxBits = bBits;
970 for (i=0;i<16;i++) {
971 v->Kernel[i] = kernel[i] >> maxBits;
972 }
973
974 v->undithered_pf = PF_Truecolor;
975 v->dithered_pf = (GET_VISUAL_DEPTH(v)<24) ? PF_Dither_True : PF_Truecolor;
976 }
977
978 /*
979 * Now check for TrueColor visuals which we can optimize.
980 */
981 if ( GET_REDMASK(v) ==0x0000ff
982 && GET_GREENMASK(v)==0x00ff00
983 && GET_BLUEMASK(v) ==0xff0000
984 && CHECK_BYTE_ORDER(v)
985 && v->BitsPerPixel==32
986 && sizeof(GLuint)==4
987 && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
988 /* common 32 bpp config used on SGI, Sun */
989 v->undithered_pf = v->dithered_pf = PF_8A8B8G8R;
990 }
991 else if (GET_REDMASK(v) ==0xff0000
992 && GET_GREENMASK(v)==0x00ff00
993 && GET_BLUEMASK(v) ==0x0000ff
994 && CHECK_BYTE_ORDER(v)
995 && v->BitsPerPixel==32
996 && sizeof(GLuint)==4
997 && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
998 /* common 32 bpp config used on Linux, HP, IBM */
999 if (GET_VISUAL_DEPTH(v)==32)
1000 v->undithered_pf = v->dithered_pf = PF_8A8R8G8B;
1001 else
1002 v->undithered_pf = v->dithered_pf = PF_8R8G8B;
1003 }
1004 else if (GET_REDMASK(v) ==0xff0000
1005 && GET_GREENMASK(v)==0x00ff00
1006 && GET_BLUEMASK(v) ==0x0000ff
1007 && CHECK_BYTE_ORDER(v)
1008 && v->BitsPerPixel==24
1009 && sizeof(GLuint)==4
1010 && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
1011 /* common packed 24 bpp config used on Linux */
1012 v->undithered_pf = v->dithered_pf = PF_8R8G8B24;
1013 }
1014 else if (GET_REDMASK(v) ==0xf800
1015 && GET_GREENMASK(v)==0x07e0
1016 && GET_BLUEMASK(v) ==0x001f
1017 && CHECK_BYTE_ORDER(v)
1018 && v->BitsPerPixel==16
1019 && sizeof(GLushort)==2
1020 && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
1021 /* 5-6-5 color weight on common PC VGA boards */
1022 v->undithered_pf = PF_5R6G5B;
1023 v->dithered_pf = PF_Dither_5R6G5B;
1024 }
1025 else if (GET_REDMASK(v) ==0xe0
1026 && GET_GREENMASK(v)==0x1c
1027 && GET_BLUEMASK(v) ==0x03
1028 && CHECK_FOR_HPCR(v)) {
1029 setup_8bit_hpcr( v );
1030 }
1031 }
1032
1033
1034
1035 /**
1036 * Setup RGB rendering for a window with a monochrome visual.
1037 */
1038 static void
1039 setup_monochrome( XMesaVisual v, XMesaBuffer b )
1040 {
1041 (void) b;
1042 v->dithered_pf = v->undithered_pf = PF_1Bit;
1043 /* if black=1 then we must flip pixel values */
1044 v->bitFlip = (GET_BLACK_PIXEL(v) != 0);
1045 }
1046
1047
1048
1049 /**
1050 * When a context is bound for the first time, we can finally finish
1051 * initializing the context's visual and buffer information.
1052 * \param v the XMesaVisual to initialize
1053 * \param b the XMesaBuffer to initialize (may be NULL)
1054 * \param rgb_flag TRUE = RGBA mode, FALSE = color index mode
1055 * \param window the window/pixmap we're rendering into
1056 * \param cmap the colormap associated with the window/pixmap
1057 * \return GL_TRUE=success, GL_FALSE=failure
1058 */
1059 static GLboolean
1060 initialize_visual_and_buffer(int client, XMesaVisual v, XMesaBuffer b,
1061 GLboolean rgb_flag, XMesaDrawable window,
1062 XMesaColormap cmap)
1063 {
1064 ASSERT(!b || b->xm_visual == v);
1065
1066 /* Save true bits/pixel */
1067 v->BitsPerPixel = bits_per_pixel(v);
1068 assert(v->BitsPerPixel > 0);
1069
1070 if (rgb_flag == GL_FALSE) {
1071 /* COLOR-INDEXED WINDOW:
1072 * Even if the visual is TrueColor or DirectColor we treat it as
1073 * being color indexed. This is weird but might be useful to someone.
1074 */
1075 v->dithered_pf = v->undithered_pf = PF_Index;
1076 v->mesa_visual.indexBits = GET_VISUAL_DEPTH(v);
1077 }
1078 else {
1079 /* RGB WINDOW:
1080 * We support RGB rendering into almost any kind of visual.
1081 */
1082 const int xclass = v->mesa_visual.visualType;
1083 if (xclass == GLX_TRUE_COLOR || xclass == GLX_DIRECT_COLOR) {
1084 setup_truecolor( v, b, cmap );
1085 }
1086 else if (xclass == GLX_STATIC_GRAY && GET_VISUAL_DEPTH(v) == 1) {
1087 setup_monochrome( v, b );
1088 }
1089 else if (xclass == GLX_GRAY_SCALE || xclass == GLX_STATIC_GRAY) {
1090 if (!setup_grayscale( client, v, b, cmap )) {
1091 return GL_FALSE;
1092 }
1093 }
1094 else if ((xclass == GLX_PSEUDO_COLOR || xclass == GLX_STATIC_COLOR)
1095 && GET_VISUAL_DEPTH(v)>=4 && GET_VISUAL_DEPTH(v)<=16) {
1096 if (!setup_dithered_color( client, v, b, cmap )) {
1097 return GL_FALSE;
1098 }
1099 }
1100 else {
1101 _mesa_warning(NULL, "XMesa: RGB mode rendering not supported in given visual.\n");
1102 return GL_FALSE;
1103 }
1104 v->mesa_visual.indexBits = 0;
1105
1106 if (_mesa_getenv("MESA_NO_DITHER")) {
1107 v->dithered_pf = v->undithered_pf;
1108 }
1109 }
1110
1111
1112 /*
1113 * If MESA_INFO env var is set print out some debugging info
1114 * which can help Brian figure out what's going on when a user
1115 * reports bugs.
1116 */
1117 if (_mesa_getenv("MESA_INFO")) {
1118 _mesa_printf("X/Mesa visual = %p\n", (void *) v);
1119 _mesa_printf("X/Mesa dithered pf = %u\n", v->dithered_pf);
1120 _mesa_printf("X/Mesa undithered pf = %u\n", v->undithered_pf);
1121 _mesa_printf("X/Mesa level = %d\n", v->mesa_visual.level);
1122 _mesa_printf("X/Mesa depth = %d\n", GET_VISUAL_DEPTH(v));
1123 _mesa_printf("X/Mesa bits per pixel = %d\n", v->BitsPerPixel);
1124 }
1125
1126 if (b && window) {
1127 /* Do window-specific initializations */
1128
1129 /* these should have been set in create_xmesa_buffer */
1130 ASSERT(b->frontxrb->drawable == window);
1131 ASSERT(b->frontxrb->pixmap == (XMesaPixmap) window);
1132
1133 /* Setup for single/double buffering */
1134 if (v->mesa_visual.doubleBufferMode) {
1135 /* Double buffered */
1136 b->shm = check_for_xshm( v->display );
1137 }
1138
1139 /* X11 graphics contexts */
1140 #ifdef XFree86Server
1141 b->gc = CreateScratchGC(v->display, window->depth);
1142 #else
1143 b->gc = XCreateGC( v->display, window, 0, NULL );
1144 #endif
1145 XMesaSetFunction( v->display, b->gc, GXcopy );
1146
1147 /* cleargc - for glClear() */
1148 #ifdef XFree86Server
1149 b->cleargc = CreateScratchGC(v->display, window->depth);
1150 #else
1151 b->cleargc = XCreateGC( v->display, window, 0, NULL );
1152 #endif
1153 XMesaSetFunction( v->display, b->cleargc, GXcopy );
1154
1155 /*
1156 * Don't generate Graphics Expose/NoExpose events in swapbuffers().
1157 * Patch contributed by Michael Pichler May 15, 1995.
1158 */
1159 #ifdef XFree86Server
1160 b->swapgc = CreateScratchGC(v->display, window->depth);
1161 {
1162 CARD32 v[1];
1163 v[0] = FALSE;
1164 dixChangeGC(NullClient, b->swapgc, GCGraphicsExposures, v, NULL);
1165 }
1166 #else
1167 {
1168 XGCValues gcvalues;
1169 gcvalues.graphics_exposures = False;
1170 b->swapgc = XCreateGC(v->display, window,
1171 GCGraphicsExposures, &gcvalues);
1172 }
1173 #endif
1174 XMesaSetFunction( v->display, b->swapgc, GXcopy );
1175 /*
1176 * Set fill style and tile pixmap once for all for HPCR stuff
1177 * (instead of doing it each time in clear_color_HPCR_pixmap())
1178 * Initialize whole stuff
1179 * Patch contributed by Jacques Leroy March 8, 1998.
1180 */
1181 if (v->hpcr_clear_flag && b->backxrb && b->backxrb->pixmap) {
1182 int i;
1183 for (i = 0; i < 16; i++) {
1184 XMesaPutPixel(v->hpcr_clear_ximage, i, 0, 0);
1185 XMesaPutPixel(v->hpcr_clear_ximage, i, 1, 0);
1186 }
1187 XMesaPutImage(b->display, (XMesaDrawable) v->hpcr_clear_pixmap,
1188 b->cleargc, v->hpcr_clear_ximage, 0, 0, 0, 0, 16, 2);
1189 XMesaSetFillStyle( v->display, b->cleargc, FillTiled);
1190 XMesaSetTile( v->display, b->cleargc, v->hpcr_clear_pixmap );
1191 }
1192
1193 /* Initialize the row buffer XImage for use in write_color_span() */
1194 #ifdef XFree86Server
1195 b->rowimage = XMesaCreateImage(GET_VISUAL_DEPTH(v), MAX_WIDTH, 1,
1196 (char *)MALLOC(MAX_WIDTH*4));
1197 #else
1198 b->rowimage = XCreateImage( v->display,
1199 v->visinfo->visual,
1200 v->visinfo->depth,
1201 ZPixmap, 0, /*format, offset*/
1202 (char*) MALLOC(MAX_WIDTH*4), /*data*/
1203 MAX_WIDTH, 1, /*width, height*/
1204 32, /*bitmap_pad*/
1205 0 /*bytes_per_line*/ );
1206 #endif
1207 if (!b->rowimage)
1208 return GL_FALSE;
1209 }
1210
1211 return GL_TRUE;
1212 }
1213
1214
1215
1216 /*
1217 * Convert an RGBA color to a pixel value.
1218 */
1219 unsigned long
1220 xmesa_color_to_pixel(GLcontext *ctx,
1221 GLubyte r, GLubyte g, GLubyte b, GLubyte a,
1222 GLuint pixelFormat)
1223 {
1224 XMesaContext xmesa = XMESA_CONTEXT(ctx);
1225 switch (pixelFormat) {
1226 case PF_Index:
1227 return 0;
1228 case PF_Truecolor:
1229 {
1230 unsigned long p;
1231 PACK_TRUECOLOR( p, r, g, b );
1232 return p;
1233 }
1234 case PF_8A8B8G8R:
1235 return PACK_8A8B8G8R( r, g, b, a );
1236 case PF_8A8R8G8B:
1237 return PACK_8A8R8G8B( r, g, b, a );
1238 case PF_8R8G8B:
1239 /* fall through */
1240 case PF_8R8G8B24:
1241 return PACK_8R8G8B( r, g, b );
1242 case PF_5R6G5B:
1243 return PACK_5R6G5B( r, g, b );
1244 case PF_Dither:
1245 {
1246 DITHER_SETUP;
1247 return DITHER( 1, 0, r, g, b );
1248 }
1249 case PF_1Bit:
1250 /* 382 = (3*255)/2 */
1251 return ((r+g+b) > 382) ^ xmesa->xm_visual->bitFlip;
1252 case PF_HPCR:
1253 return DITHER_HPCR(1, 1, r, g, b);
1254 case PF_Lookup:
1255 {
1256 LOOKUP_SETUP;
1257 return LOOKUP( r, g, b );
1258 }
1259 case PF_Grayscale:
1260 return GRAY_RGB( r, g, b );
1261 case PF_Dither_True:
1262 /* fall through */
1263 case PF_Dither_5R6G5B:
1264 {
1265 unsigned long p;
1266 PACK_TRUEDITHER(p, 1, 0, r, g, b);
1267 return p;
1268 }
1269 default:
1270 _mesa_problem(ctx, "Bad pixel format in xmesa_color_to_pixel");
1271 }
1272 return 0;
1273 }
1274
1275
1276 #define NUM_VISUAL_TYPES 6
1277
1278 /**
1279 * Convert an X visual type to a GLX visual type.
1280 *
1281 * \param visualType X visual type (i.e., \c TrueColor, \c StaticGray, etc.)
1282 * to be converted.
1283 * \return If \c visualType is a valid X visual type, a GLX visual type will
1284 * be returned. Otherwise \c GLX_NONE will be returned.
1285 *
1286 * \note
1287 * This code was lifted directly from lib/GL/glx/glcontextmodes.c in the
1288 * DRI CVS tree.
1289 */
1290 static GLint
1291 xmesa_convert_from_x_visual_type( int visualType )
1292 {
1293 static const int glx_visual_types[ NUM_VISUAL_TYPES ] = {
1294 GLX_STATIC_GRAY, GLX_GRAY_SCALE,
1295 GLX_STATIC_COLOR, GLX_PSEUDO_COLOR,
1296 GLX_TRUE_COLOR, GLX_DIRECT_COLOR
1297 };
1298
1299 return ( (unsigned) visualType < NUM_VISUAL_TYPES )
1300 ? glx_visual_types[ visualType ] : GLX_NONE;
1301 }
1302
1303
1304 /**********************************************************************/
1305 /***** Public Functions *****/
1306 /**********************************************************************/
1307
1308
1309 /*
1310 * Create a new X/Mesa visual.
1311 * Input: display - X11 display
1312 * visinfo - an XVisualInfo pointer
1313 * rgb_flag - GL_TRUE = RGB mode,
1314 * GL_FALSE = color index mode
1315 * alpha_flag - alpha buffer requested?
1316 * db_flag - GL_TRUE = double-buffered,
1317 * GL_FALSE = single buffered
1318 * stereo_flag - stereo visual?
1319 * ximage_flag - GL_TRUE = use an XImage for back buffer,
1320 * GL_FALSE = use an off-screen pixmap for back buffer
1321 * depth_size - requested bits/depth values, or zero
1322 * stencil_size - requested bits/stencil values, or zero
1323 * accum_red_size - requested bits/red accum values, or zero
1324 * accum_green_size - requested bits/green accum values, or zero
1325 * accum_blue_size - requested bits/blue accum values, or zero
1326 * accum_alpha_size - requested bits/alpha accum values, or zero
1327 * num_samples - number of samples/pixel if multisampling, or zero
1328 * level - visual level, usually 0
1329 * visualCaveat - ala the GLX extension, usually GLX_NONE
1330 * Return; a new XMesaVisual or 0 if error.
1331 */
1332 XMesaVisual XMesaCreateVisual( XMesaDisplay *display,
1333 XMesaVisualInfo visinfo,
1334 GLboolean rgb_flag,
1335 GLboolean alpha_flag,
1336 GLboolean db_flag,
1337 GLboolean stereo_flag,
1338 GLboolean ximage_flag,
1339 GLint depth_size,
1340 GLint stencil_size,
1341 GLint accum_red_size,
1342 GLint accum_green_size,
1343 GLint accum_blue_size,
1344 GLint accum_alpha_size,
1345 GLint num_samples,
1346 GLint level,
1347 GLint visualCaveat )
1348 {
1349 char *gamma;
1350 XMesaVisual v;
1351 GLint red_bits, green_bits, blue_bits, alpha_bits;
1352
1353 #ifndef XFree86Server
1354 /* For debugging only */
1355 if (_mesa_getenv("MESA_XSYNC")) {
1356 /* This makes debugging X easier.
1357 * In your debugger, set a breakpoint on _XError to stop when an
1358 * X protocol error is generated.
1359 */
1360 XSynchronize( display, 1 );
1361 }
1362 #endif
1363
1364 v = (XMesaVisual) CALLOC_STRUCT(xmesa_visual);
1365 if (!v) {
1366 return NULL;
1367 }
1368
1369 /*
1370 * In the X server, NULL is passed in for the display. It will have
1371 * to be set before using this visual. See XMesaSetVisualDisplay()
1372 * below.
1373 */
1374 v->display = display;
1375
1376 /* Save a copy of the XVisualInfo struct because the user may X_mesa_free()
1377 * the struct but we may need some of the information contained in it
1378 * at a later time.
1379 */
1380 #ifndef XFree86Server
1381 v->visinfo = (XVisualInfo *) MALLOC(sizeof(*visinfo));
1382 if(!v->visinfo) {
1383 _mesa_free(v);
1384 return NULL;
1385 }
1386 MEMCPY(v->visinfo, visinfo, sizeof(*visinfo));
1387 #endif
1388
1389 /* check for MESA_GAMMA environment variable */
1390 gamma = _mesa_getenv("MESA_GAMMA");
1391 if (gamma) {
1392 v->RedGamma = v->GreenGamma = v->BlueGamma = 0.0;
1393 sscanf( gamma, "%f %f %f", &v->RedGamma, &v->GreenGamma, &v->BlueGamma );
1394 if (v->RedGamma<=0.0) v->RedGamma = 1.0;
1395 if (v->GreenGamma<=0.0) v->GreenGamma = v->RedGamma;
1396 if (v->BlueGamma<=0.0) v->BlueGamma = v->RedGamma;
1397 }
1398 else {
1399 v->RedGamma = v->GreenGamma = v->BlueGamma = 1.0;
1400 }
1401
1402 v->ximage_flag = ximage_flag;
1403
1404 #ifdef XFree86Server
1405 /* We could calculate these values by ourselves. nplanes is either the sum
1406 * of the red, green, and blue bits or the number index bits.
1407 * ColormapEntries is either (1U << index_bits) or
1408 * (1U << max(redBits, greenBits, blueBits)).
1409 */
1410 assert(visinfo->nplanes > 0);
1411 v->nplanes = visinfo->nplanes;
1412 v->ColormapEntries = visinfo->ColormapEntries;
1413
1414 v->mesa_visual.redMask = visinfo->redMask;
1415 v->mesa_visual.greenMask = visinfo->greenMask;
1416 v->mesa_visual.blueMask = visinfo->blueMask;
1417 v->mesa_visual.visualID = visinfo->vid;
1418 v->mesa_visual.screen = 0; /* FIXME: What should be done here? */
1419 #else
1420 v->mesa_visual.redMask = visinfo->red_mask;
1421 v->mesa_visual.greenMask = visinfo->green_mask;
1422 v->mesa_visual.blueMask = visinfo->blue_mask;
1423 v->mesa_visual.visualID = visinfo->visualid;
1424 v->mesa_visual.screen = visinfo->screen;
1425 #endif
1426
1427 #if defined(XFree86Server) || !(defined(__cplusplus) || defined(c_plusplus))
1428 v->mesa_visual.visualType = xmesa_convert_from_x_visual_type(visinfo->class);
1429 #else
1430 v->mesa_visual.visualType = xmesa_convert_from_x_visual_type(visinfo->c_class);
1431 #endif
1432
1433 v->mesa_visual.visualRating = visualCaveat;
1434
1435 (void) initialize_visual_and_buffer( 0, v, NULL, rgb_flag, 0, 0 );
1436
1437 {
1438 const int xclass = v->mesa_visual.visualType;
1439 if (xclass == GLX_TRUE_COLOR || xclass == GLX_DIRECT_COLOR) {
1440 red_bits = _mesa_bitcount(GET_REDMASK(v));
1441 green_bits = _mesa_bitcount(GET_GREENMASK(v));
1442 blue_bits = _mesa_bitcount(GET_BLUEMASK(v));
1443 alpha_bits = 0;
1444 }
1445 else {
1446 /* this is an approximation */
1447 int depth;
1448 depth = GET_VISUAL_DEPTH(v);
1449 red_bits = depth / 3;
1450 depth -= red_bits;
1451 green_bits = depth / 2;
1452 depth -= green_bits;
1453 blue_bits = depth;
1454 alpha_bits = 0;
1455 assert( red_bits + green_bits + blue_bits == GET_VISUAL_DEPTH(v) );
1456 }
1457 }
1458
1459 if (alpha_flag && alpha_bits == 0)
1460 alpha_bits = 8;
1461
1462 _mesa_initialize_visual( &v->mesa_visual,
1463 rgb_flag, db_flag, stereo_flag,
1464 red_bits, green_bits,
1465 blue_bits, alpha_bits,
1466 v->mesa_visual.indexBits,
1467 depth_size,
1468 stencil_size,
1469 accum_red_size, accum_green_size,
1470 accum_blue_size, accum_alpha_size,
1471 0 );
1472
1473 /* XXX minor hack */
1474 v->mesa_visual.level = level;
1475 return v;
1476 }
1477
1478
1479 void XMesaSetVisualDisplay( XMesaDisplay *dpy, XMesaVisual v )
1480 {
1481 v->display = dpy;
1482 }
1483
1484
1485 void XMesaDestroyVisual( XMesaVisual v )
1486 {
1487 #ifndef XFree86Server
1488 _mesa_free(v->visinfo);
1489 #endif
1490 _mesa_free(v);
1491 }
1492
1493
1494
1495 /**
1496 * Create a new XMesaContext.
1497 * \param v the XMesaVisual
1498 * \param share_list another XMesaContext with which to share display
1499 * lists or NULL if no sharing is wanted.
1500 * \return an XMesaContext or NULL if error.
1501 */
1502 XMesaContext XMesaCreateContext( XMesaVisual v, XMesaContext share_list )
1503 {
1504 static GLboolean firstTime = GL_TRUE;
1505 XMesaContext c;
1506 GLcontext *mesaCtx;
1507 struct dd_function_table functions;
1508 TNLcontext *tnl;
1509
1510 if (firstTime) {
1511 _glthread_INIT_MUTEX(_xmesa_lock);
1512 firstTime = GL_FALSE;
1513 }
1514
1515 /* Note: the XMesaContext contains a Mesa GLcontext struct (inheritance) */
1516 c = (XMesaContext) CALLOC_STRUCT(xmesa_context);
1517 if (!c)
1518 return NULL;
1519
1520 mesaCtx = &(c->mesa);
1521
1522 /* initialize with default driver functions, then plug in XMesa funcs */
1523 _mesa_init_driver_functions(&functions);
1524 xmesa_init_driver_functions(v, &functions);
1525 if (!_mesa_initialize_context(mesaCtx, &v->mesa_visual,
1526 share_list ? &(share_list->mesa) : (GLcontext *) NULL,
1527 &functions, (void *) c)) {
1528 _mesa_free(c);
1529 return NULL;
1530 }
1531
1532 _mesa_enable_sw_extensions(mesaCtx);
1533 _mesa_enable_1_3_extensions(mesaCtx);
1534 _mesa_enable_1_4_extensions(mesaCtx);
1535 _mesa_enable_1_5_extensions(mesaCtx);
1536 _mesa_enable_2_0_extensions(mesaCtx);
1537 #if ENABLE_EXT_texure_compression_s3tc
1538 if (c->Mesa_DXTn) {
1539 _mesa_enable_extension(mesaCtx, "GL_EXT_texture_compression_s3tc");
1540 _mesa_enable_extension(mesaCtx, "GL_S3_s3tc");
1541 }
1542 _mesa_enable_extension(mesaCtx, "GL_3DFX_texture_compression_FXT1");
1543 #endif
1544 #if ENABLE_EXT_timer_query
1545 _mesa_enable_extension(mesaCtx, "GL_EXT_timer_query");
1546 #endif
1547
1548 /* finish up xmesa context initializations */
1549 c->swapbytes = CHECK_BYTE_ORDER(v) ? GL_FALSE : GL_TRUE;
1550 c->xm_visual = v;
1551 c->xm_buffer = NULL; /* set later by XMesaMakeCurrent */
1552 c->display = v->display;
1553 c->pixelformat = v->dithered_pf; /* Dithering is enabled by default */
1554
1555 /* Initialize the software rasterizer and helper modules.
1556 */
1557 if (!_swrast_CreateContext( mesaCtx ) ||
1558 !_ac_CreateContext( mesaCtx ) ||
1559 !_tnl_CreateContext( mesaCtx ) ||
1560 !_swsetup_CreateContext( mesaCtx )) {
1561 _mesa_free_context_data(&c->mesa);
1562 _mesa_free(c);
1563 return NULL;
1564 }
1565
1566 /* tnl setup */
1567 tnl = TNL_CONTEXT(mesaCtx);
1568 tnl->Driver.RunPipeline = _tnl_run_pipeline;
1569 /* swrast setup */
1570 xmesa_register_swrast_functions( mesaCtx );
1571 _swsetup_Wakeup(mesaCtx);
1572
1573 return c;
1574 }
1575
1576
1577
1578 void XMesaDestroyContext( XMesaContext c )
1579 {
1580 GLcontext *mesaCtx = &c->mesa;
1581 #ifdef FX
1582 XMesaBuffer xmbuf = XMESA_BUFFER(mesaCtx->DrawBuffer);
1583
1584 if (xmbuf && xmbuf->FXctx)
1585 fxMesaDestroyContext(xmbuf->FXctx);
1586 #endif
1587 _swsetup_DestroyContext( mesaCtx );
1588 _swrast_DestroyContext( mesaCtx );
1589 _tnl_DestroyContext( mesaCtx );
1590 _ac_DestroyContext( mesaCtx );
1591 _mesa_free_context_data( mesaCtx );
1592 _mesa_free( c );
1593 }
1594
1595
1596
1597 /**
1598 * Private function for creating an XMesaBuffer which corresponds to an
1599 * X window or pixmap.
1600 * \param v the window's XMesaVisual
1601 * \param w the window we're wrapping
1602 * \param c context used to initialize the buffer if 3Dfx mode in use.
1603 * \return new XMesaBuffer or NULL if error
1604 */
1605 XMesaBuffer
1606 XMesaCreateWindowBuffer2(XMesaVisual v, XMesaWindow w, XMesaContext c)
1607 {
1608 #ifndef XFree86Server
1609 XWindowAttributes attr;
1610 #endif
1611 #ifdef FX
1612 char *fxEnvVar;
1613 #endif
1614 int client = 0;
1615 XMesaBuffer b;
1616 XMesaColormap cmap;
1617
1618 assert(v);
1619 assert(w);
1620 (void) c;
1621
1622 /* Check that window depth matches visual depth */
1623 #ifdef XFree86Server
1624 client = CLIENT_ID(((XMesaDrawable)w)->id);
1625
1626 if (GET_VISUAL_DEPTH(v) != ((XMesaDrawable)w)->depth) {
1627 _mesa_warning(NULL, "XMesaCreateWindowBuffer: depth mismatch between visual (%d) and window (%d)!\n",
1628 GET_VISUAL_DEPTH(v), ((XMesaDrawable) w)->depth);
1629 return NULL;
1630 }
1631 #else
1632 XGetWindowAttributes( v->display, w, &attr );
1633
1634 if (GET_VISUAL_DEPTH(v) != attr.depth) {
1635 _mesa_warning(NULL, "XMesaCreateWindowBuffer: depth mismatch between visual (%d) and window (%d)!\n",
1636 GET_VISUAL_DEPTH(v), attr.depth);
1637 return NULL;
1638 }
1639 #endif
1640
1641 /* Find colormap */
1642 #ifdef XFree86Server
1643 cmap = (ColormapPtr)LookupIDByType(wColormap(w), RT_COLORMAP);
1644 #else
1645 if (attr.colormap) {
1646 cmap = attr.colormap;
1647 }
1648 else {
1649 _mesa_warning(NULL, "Window %u has no colormap!\n", (unsigned int) w);
1650 /* this is weird, a window w/out a colormap!? */
1651 /* OK, let's just allocate a new one and hope for the best */
1652 cmap = XCreateColormap(v->display, w, attr.visual, AllocNone);
1653 }
1654 #endif
1655
1656 b = create_xmesa_buffer((XMesaDrawable) w, WINDOW, v, cmap);
1657 if (!b)
1658 return NULL;
1659
1660 if (!initialize_visual_and_buffer( client, v, b, v->mesa_visual.rgbMode,
1661 (XMesaDrawable) w, cmap )) {
1662 free_xmesa_buffer(client, b);
1663 return NULL;
1664 }
1665
1666 #ifdef FX
1667 fxEnvVar = _mesa_getenv("MESA_GLX_FX");
1668 if (fxEnvVar) {
1669 if (fxEnvVar[0]!='d') {
1670 int attribs[100];
1671 int numAttribs = 0;
1672 int hw;
1673 if (v->mesa_visual.depthBits > 0) {
1674 attribs[numAttribs++] = FXMESA_DEPTH_SIZE;
1675 attribs[numAttribs++] = v->mesa_visual.depthBits;
1676 }
1677 if (v->mesa_visual.doubleBufferMode) {
1678 attribs[numAttribs++] = FXMESA_DOUBLEBUFFER;
1679 }
1680 if (v->mesa_visual.accumRedBits > 0) {
1681 attribs[numAttribs++] = FXMESA_ACCUM_SIZE;
1682 attribs[numAttribs++] = v->mesa_visual.accumRedBits;
1683 }
1684 if (v->mesa_visual.stencilBits > 0) {
1685 attribs[numAttribs++] = FXMESA_STENCIL_SIZE;
1686 attribs[numAttribs++] = v->mesa_visual.stencilBits;
1687 }
1688 if (v->mesa_visual.alphaBits > 0) {
1689 attribs[numAttribs++] = FXMESA_ALPHA_SIZE;
1690 attribs[numAttribs++] = v->mesa_visual.alphaBits;
1691 }
1692 if (1) {
1693 attribs[numAttribs++] = FXMESA_SHARE_CONTEXT;
1694 attribs[numAttribs++] = (int) &(c->mesa);
1695 }
1696 attribs[numAttribs++] = FXMESA_NONE;
1697
1698 /* [dBorca] we should take an envvar for `fxMesaSelectCurrentBoard'!!! */
1699 hw = fxMesaSelectCurrentBoard(0);
1700
1701 /* if these fail, there's a new bug somewhere */
1702 ASSERT(b->mesa_buffer.Width > 0);
1703 ASSERT(b->mesa_buffer.Height > 0);
1704
1705 if ((hw == GR_SSTTYPE_VOODOO) || (hw == GR_SSTTYPE_Voodoo2)) {
1706 b->FXctx = fxMesaCreateBestContext(0, b->mesa_buffer.Width,
1707 b->mesa_buffer.Height, attribs);
1708 if ((v->undithered_pf!=PF_Index) && (b->backxrb->ximage)) {
1709 b->FXisHackUsable = b->FXctx ? GL_TRUE : GL_FALSE;
1710 if (b->FXctx && (fxEnvVar[0]=='w' || fxEnvVar[0]=='W')) {
1711 b->FXwindowHack = GL_TRUE;
1712 FX_grSstControl(GR_CONTROL_DEACTIVATE);
1713 }
1714 else {
1715 b->FXwindowHack = GL_FALSE;
1716 }
1717 }
1718 }
1719 else {
1720 if (fxEnvVar[0]=='w' || fxEnvVar[0]=='W')
1721 b->FXctx = fxMesaCreateContext(w, GR_RESOLUTION_NONE,
1722 GR_REFRESH_75Hz, attribs);
1723 else
1724 b->FXctx = fxMesaCreateBestContext(0, b->mesa_buffer.Width,
1725 b->mesa_buffer.Height, attribs);
1726 b->FXisHackUsable = GL_FALSE;
1727 b->FXwindowHack = GL_FALSE;
1728 }
1729 /*
1730 fprintf(stderr,
1731 "voodoo %d, wid %d height %d hack: usable %d active %d\n",
1732 hw, b->mesa_buffer.Width, b->mesa_buffer.Height,
1733 b->FXisHackUsable, b->FXwindowHack);
1734 */
1735 }
1736 }
1737 else {
1738 _mesa_warning(NULL, "WARNING: This Mesa Library includes the Glide driver but\n");
1739 _mesa_warning(NULL, " you have not defined the MESA_GLX_FX env. var.\n");
1740 _mesa_warning(NULL, " (check the README.3DFX file for more information).\n\n");
1741 _mesa_warning(NULL, " you can disable this message with a 'export MESA_GLX_FX=disable'.\n");
1742 }
1743 #endif
1744
1745 return b;
1746 }
1747
1748
1749 XMesaBuffer
1750 XMesaCreateWindowBuffer(XMesaVisual v, XMesaWindow w)
1751 {
1752 return XMesaCreateWindowBuffer2( v, w, NULL );
1753 }
1754
1755
1756 /**
1757 * Create a new XMesaBuffer from an X pixmap.
1758 *
1759 * \param v the XMesaVisual
1760 * \param p the pixmap
1761 * \param cmap the colormap, may be 0 if using a \c GLX_TRUE_COLOR or
1762 * \c GLX_DIRECT_COLOR visual for the pixmap
1763 * \returns new XMesaBuffer or NULL if error
1764 */
1765 XMesaBuffer
1766 XMesaCreatePixmapBuffer(XMesaVisual v, XMesaPixmap p, XMesaColormap cmap)
1767 {
1768 int client = 0;
1769 XMesaBuffer b;
1770
1771 assert(v);
1772
1773 b = create_xmesa_buffer((XMesaDrawable) p, PIXMAP, v, cmap);
1774 if (!b)
1775 return NULL;
1776
1777 #ifdef XFree86Server
1778 client = CLIENT_ID(((XMesaDrawable)p)->id);
1779 #endif
1780
1781 if (!initialize_visual_and_buffer(client, v, b, v->mesa_visual.rgbMode,
1782 (XMesaDrawable) p, cmap)) {
1783 free_xmesa_buffer(client, b);
1784 return NULL;
1785 }
1786
1787 return b;
1788 }
1789
1790
1791
1792 XMesaBuffer
1793 XMesaCreatePBuffer(XMesaVisual v, XMesaColormap cmap,
1794 unsigned int width, unsigned int height)
1795 {
1796 #ifdef XFree86Server
1797 return 0;
1798 #else
1799 int client = 0;
1800 XMesaWindow root;
1801 XMesaDrawable drawable; /* X Pixmap Drawable */
1802 XMesaBuffer b;
1803
1804 /* allocate pixmap for front buffer */
1805 root = RootWindow( v->display, v->visinfo->screen );
1806 drawable = XCreatePixmap(v->display, root, width, height,
1807 v->visinfo->depth);
1808 if (!drawable)
1809 return NULL;
1810
1811 b = create_xmesa_buffer(drawable, PBUFFER, v, cmap);
1812 if (!b)
1813 return NULL;
1814
1815 if (!initialize_visual_and_buffer(client, v, b, v->mesa_visual.rgbMode,
1816 drawable, cmap)) {
1817 free_xmesa_buffer(client, b);
1818 return NULL;
1819 }
1820
1821 return b;
1822 #endif
1823 }
1824
1825
1826
1827 /*
1828 * Deallocate an XMesaBuffer structure and all related info.
1829 */
1830 void XMesaDestroyBuffer( XMesaBuffer b )
1831 {
1832 int client = 0;
1833
1834 #ifdef XFree86Server
1835 if (b->frontxrb->drawable)
1836 client = CLIENT_ID(b->frontxrb->drawable->id);
1837 #endif
1838
1839 if (b->gc) XMesaFreeGC( b->xm_visual->display, b->gc );
1840 if (b->cleargc) XMesaFreeGC( b->xm_visual->display, b->cleargc );
1841 if (b->swapgc) XMesaFreeGC( b->xm_visual->display, b->swapgc );
1842
1843 if (b->xm_visual->mesa_visual.doubleBufferMode)
1844 {
1845 if (b->backxrb->ximage) {
1846 #if defined(USE_XSHM) && !defined(XFree86Server)
1847 if (b->shm) {
1848 XShmDetach( b->xm_visual->display, &b->shminfo );
1849 XDestroyImage( b->backxrb->ximage );
1850 shmdt( b->shminfo.shmaddr );
1851 }
1852 else
1853 #endif
1854 XMesaDestroyImage( b->backxrb->ximage );
1855 }
1856 if (b->backxrb->pixmap) {
1857 XMesaFreePixmap( b->xm_visual->display, b->backxrb->pixmap );
1858 if (b->xm_visual->hpcr_clear_flag) {
1859 XMesaFreePixmap( b->xm_visual->display,
1860 b->xm_visual->hpcr_clear_pixmap );
1861 XMesaDestroyImage( b->xm_visual->hpcr_clear_ximage );
1862 }
1863 }
1864 }
1865 if (b->rowimage) {
1866 _mesa_free( b->rowimage->data );
1867 b->rowimage->data = NULL;
1868 XMesaDestroyImage( b->rowimage );
1869 }
1870
1871 free_xmesa_buffer(client, b);
1872 }
1873
1874
1875 /**
1876 * Query the current window size and update the corresponding GLframebuffer
1877 * and all attached renderbuffers.
1878 * Called when:
1879 * 1. the first time a buffer is bound to a context.
1880 * 2. from glViewport to poll for window size changes
1881 * 3. from the XMesaResizeBuffers() API function.
1882 */
1883 void
1884 xmesa_check_and_update_buffer_size(XMesaContext xmctx, XMesaBuffer drawBuffer)
1885 {
1886 GLuint width, height;
1887 xmesa_get_window_size(xmctx->display, drawBuffer, &width, &height);
1888 if (drawBuffer->mesa_buffer.Width != width ||
1889 drawBuffer->mesa_buffer.Height != height) {
1890 _mesa_resize_framebuffer(&(xmctx->mesa),
1891 &(drawBuffer->mesa_buffer), width, height);
1892 }
1893 drawBuffer->mesa_buffer.Initialized = GL_TRUE; /* XXX TEMPORARY? */
1894 }
1895
1896
1897 /*
1898 * Bind buffer b to context c and make c the current rendering context.
1899 */
1900 GLboolean XMesaMakeCurrent( XMesaContext c, XMesaBuffer b )
1901 {
1902 return XMesaMakeCurrent2( c, b, b );
1903 }
1904
1905
1906 /*
1907 * Bind buffer b to context c and make c the current rendering context.
1908 */
1909 GLboolean XMesaMakeCurrent2( XMesaContext c, XMesaBuffer drawBuffer,
1910 XMesaBuffer readBuffer )
1911 {
1912 if (c) {
1913 if (!drawBuffer || !readBuffer)
1914 return GL_FALSE; /* must specify buffers! */
1915
1916 #ifdef FX
1917 if (drawBuffer->FXctx) {
1918 fxMesaMakeCurrent(drawBuffer->FXctx);
1919
1920 c->xm_buffer = drawBuffer;
1921
1922 return GL_TRUE;
1923 }
1924 #endif
1925 if (&(c->mesa) == _mesa_get_current_context()
1926 && c->mesa.DrawBuffer == &drawBuffer->mesa_buffer
1927 && c->mesa.ReadBuffer == &readBuffer->mesa_buffer
1928 && XMESA_BUFFER(c->mesa.DrawBuffer)->wasCurrent) {
1929 /* same context and buffer, do nothing */
1930 return GL_TRUE;
1931 }
1932
1933 c->xm_buffer = drawBuffer;
1934
1935 /* Call this periodically to detect when the user has begun using
1936 * GL rendering from multiple threads.
1937 */
1938 _glapi_check_multithread();
1939
1940 xmesa_check_and_update_buffer_size(c, drawBuffer);
1941 if (readBuffer != drawBuffer)
1942 xmesa_check_and_update_buffer_size(c, readBuffer);
1943
1944 _mesa_make_current(&(c->mesa),
1945 &drawBuffer->mesa_buffer,
1946 &readBuffer->mesa_buffer);
1947
1948 if (c->xm_visual->mesa_visual.rgbMode) {
1949 /*
1950 * Must recompute and set these pixel values because colormap
1951 * can be different for different windows.
1952 */
1953 c->clearpixel = xmesa_color_to_pixel( &c->mesa,
1954 c->clearcolor[0],
1955 c->clearcolor[1],
1956 c->clearcolor[2],
1957 c->clearcolor[3],
1958 c->xm_visual->undithered_pf);
1959 XMesaSetForeground(c->display, drawBuffer->cleargc, c->clearpixel);
1960 }
1961
1962 /* Solution to Stephane Rehel's problem with glXReleaseBuffersMESA(): */
1963 drawBuffer->wasCurrent = GL_TRUE;
1964 }
1965 else {
1966 /* Detach */
1967 _mesa_make_current( NULL, NULL, NULL );
1968 }
1969 return GL_TRUE;
1970 }
1971
1972
1973 /*
1974 * Unbind the context c from its buffer.
1975 */
1976 GLboolean XMesaUnbindContext( XMesaContext c )
1977 {
1978 /* A no-op for XFree86 integration purposes */
1979 return GL_TRUE;
1980 }
1981
1982
1983 XMesaContext XMesaGetCurrentContext( void )
1984 {
1985 GET_CURRENT_CONTEXT(ctx);
1986 if (ctx) {
1987 XMesaContext xmesa = XMESA_CONTEXT(ctx);
1988 return xmesa;
1989 }
1990 else {
1991 return 0;
1992 }
1993 }
1994
1995
1996 XMesaBuffer XMesaGetCurrentBuffer( void )
1997 {
1998 GET_CURRENT_CONTEXT(ctx);
1999 if (ctx) {
2000 XMesaBuffer xmbuf = XMESA_BUFFER(ctx->DrawBuffer);
2001 return xmbuf;
2002 }
2003 else {
2004 return 0;
2005 }
2006 }
2007
2008
2009 /* New in Mesa 3.1 */
2010 XMesaBuffer XMesaGetCurrentReadBuffer( void )
2011 {
2012 GET_CURRENT_CONTEXT(ctx);
2013 if (ctx) {
2014 return XMESA_BUFFER(ctx->ReadBuffer);
2015 }
2016 else {
2017 return 0;
2018 }
2019 }
2020
2021
2022 GLboolean XMesaForceCurrent(XMesaContext c)
2023 {
2024 if (c) {
2025 if (&(c->mesa) != _mesa_get_current_context()) {
2026 _mesa_make_current(&c->mesa, c->mesa.DrawBuffer, c->mesa.ReadBuffer);
2027 }
2028 }
2029 else {
2030 _mesa_make_current(NULL, NULL, NULL);
2031 }
2032 return GL_TRUE;
2033 }
2034
2035
2036 GLboolean XMesaLoseCurrent(XMesaContext c)
2037 {
2038 (void) c;
2039 _mesa_make_current(NULL, NULL, NULL);
2040 return GL_TRUE;
2041 }
2042
2043
2044 /*
2045 * Switch 3Dfx support hack between window and full-screen mode.
2046 */
2047 GLboolean XMesaSetFXmode( GLint mode )
2048 {
2049 #ifdef FX
2050 const char *fx = _mesa_getenv("MESA_GLX_FX");
2051 if (fx && fx[0] != 'd') {
2052 GET_CURRENT_CONTEXT(ctx);
2053 GrHwConfiguration hw;
2054 if (!FX_grSstQueryHardware(&hw)) {
2055 /*fprintf(stderr, "!grSstQueryHardware\n");*/
2056 return GL_FALSE;
2057 }
2058 if (hw.num_sst < 1) {
2059 /*fprintf(stderr, "hw.num_sst < 1\n");*/
2060 return GL_FALSE;
2061 }
2062 if (ctx) {
2063 /* [dBorca] Hack alert:
2064 * oh, this is sooo wrong: ctx above is
2065 * really an fxMesaContext, not an XMesaContext
2066 */
2067 XMesaBuffer xmbuf = XMESA_BUFFER(ctx->DrawBuffer);
2068 if (mode == XMESA_FX_WINDOW) {
2069 if (xmbuf->FXisHackUsable) {
2070 FX_grSstControl(GR_CONTROL_DEACTIVATE);
2071 xmbuf->FXwindowHack = GL_TRUE;
2072 return GL_TRUE;
2073 }
2074 }
2075 else if (mode == XMESA_FX_FULLSCREEN) {
2076 FX_grSstControl(GR_CONTROL_ACTIVATE);
2077 xmbuf->FXwindowHack = GL_FALSE;
2078 return GL_TRUE;
2079 }
2080 else {
2081 /* Error: Bad mode value */
2082 }
2083 }
2084 }
2085 /*fprintf(stderr, "fallthrough\n");*/
2086 #else
2087 (void) mode;
2088 #endif
2089 return GL_FALSE;
2090 }
2091
2092
2093
2094 #ifdef FX
2095 /*
2096 * Read image from VooDoo frame buffer into X/Mesa's back XImage.
2097 */
2098 static void FXgetImage( XMesaBuffer b )
2099 {
2100 GET_CURRENT_CONTEXT(ctx);
2101 static unsigned short pixbuf[MAX_WIDTH];
2102 GLuint x, y;
2103 GLuint width, height;
2104 XMesaContext xmesa = XMESA_CONTEXT(ctx);
2105
2106 #ifdef XFree86Server
2107 x = b->frontxrb->pixmap->x;
2108 y = b->frontxrb->pixmap->y;
2109 width = b->frontxrb->pixmap->width;
2110 height = b->frontxrb->pixmap->height;
2111 depth = b->frontxrb->pixmap->depth;
2112 #else
2113 xmesa_get_window_size(b->display, b, &width, &height);
2114 x = y = 0;
2115 #endif
2116 if (b->mesa_buffer.Width != width || b->mesa_buffer.Height != height) {
2117 b->mesa_buffer.Width = MIN2((int)width, b->FXctx->width);
2118 b->mesa_buffer.Height = MIN2((int)height, b->FXctx->height);
2119 if (b->mesa_buffer.Width & 1)
2120 b->mesa_buffer.Width--; /* prevent odd width */
2121 }
2122
2123 /* [dBorca] we're always in the right GR_COLORFORMAT... aren't we? */
2124 /* grLfbWriteColorFormat(GR_COLORFORMAT_ARGB); */
2125 if (b->xm_visual->undithered_pf==PF_5R6G5B) {
2126 /* Special case: 16bpp RGB */
2127 grLfbReadRegion( GR_BUFFER_FRONTBUFFER, /* src buffer */
2128 0, b->FXctx->height - b->mesa_buffer.Height, /*pos*/
2129 b->mesa_buffer.Width, b->mesa_buffer.Height, /* size */
2130 b->mesa_buffer.Width * sizeof(GLushort), /* stride */
2131 b->backxrb->ximage->data); /* dest buffer */
2132 }
2133 else if (b->xm_visual->dithered_pf==PF_Dither
2134 && GET_VISUAL_DEPTH(b->xm_visual)==8) {
2135 /* Special case: 8bpp RGB */
2136 for (y=0;y<b->mesa_buffer.Height;y++) {
2137 GLubyte *ptr = (GLubyte*) b->backxrb->ximage->data
2138 + b->backxrb->ximage->bytes_per_line * y;
2139 XDITHER_SETUP(y);
2140
2141 /* read row from 3Dfx frame buffer */
2142 grLfbReadRegion( GR_BUFFER_FRONTBUFFER,
2143 0, b->FXctx->height-(b->mesa_buffer.Height-y),
2144 b->mesa_buffer.Width, 1,
2145 0,
2146 pixbuf );
2147
2148 /* write to XImage back buffer */
2149 for (x=0;x<b->mesa_buffer.Width;x++) {
2150 GLubyte r = (pixbuf[x] & 0xf800) >> 8;
2151 GLubyte g = (pixbuf[x] & 0x07e0) >> 3;
2152 GLubyte b = (pixbuf[x] & 0x001f) << 3;
2153 *ptr++ = XDITHER( x, r, g, b);
2154 }
2155 }
2156 }
2157 else {
2158 /* General case: slow! */
2159 for (y=0;y<b->mesa_buffer.Height;y++) {
2160 /* read row from 3Dfx frame buffer */
2161 grLfbReadRegion( GR_BUFFER_FRONTBUFFER,
2162 0, b->FXctx->height-(b->mesa_buffer.Height-y),
2163 b->mesa_buffer.Width, 1,
2164 0,
2165 pixbuf );
2166
2167 /* write to XImage back buffer */
2168 for (x=0;x<b->mesa_buffer.Width;x++) {
2169 XMesaPutPixel(b->backxrb->ximage,x,y,
2170 xmesa_color_to_pixel(ctx,
2171 (pixbuf[x] & 0xf800) >> 8,
2172 (pixbuf[x] & 0x07e0) >> 3,
2173 (pixbuf[x] & 0x001f) << 3,
2174 0xff,
2175 b->xm_visual->undithered_pf));
2176 }
2177 }
2178 }
2179 /* grLfbWriteColorFormat(GR_COLORFORMAT_ABGR); */
2180 }
2181 #endif
2182
2183
2184 /*
2185 * Copy the back buffer to the front buffer. If there's no back buffer
2186 * this is a no-op.
2187 */
2188 void XMesaSwapBuffers( XMesaBuffer b )
2189 {
2190 GET_CURRENT_CONTEXT(ctx);
2191
2192 if (!b->backxrb) {
2193 /* single buffered */
2194 return;
2195 }
2196
2197 /* If we're swapping the buffer associated with the current context
2198 * we have to flush any pending rendering commands first.
2199 */
2200 if (ctx && ctx->DrawBuffer == &(b->mesa_buffer))
2201 _mesa_notifySwapBuffers(ctx);
2202
2203 if (b->db_mode) {
2204 #ifdef FX
2205 if (b->FXctx) {
2206 fxMesaSwapBuffers();
2207
2208 if (b->FXwindowHack)
2209 FXgetImage(b);
2210 else
2211 return;
2212 }
2213 #endif
2214 if (b->backxrb->ximage) {
2215 /* Copy Ximage from host's memory to server's window */
2216 #if defined(USE_XSHM) && !defined(XFree86Server)
2217 if (b->shm) {
2218 /*_glthread_LOCK_MUTEX(_xmesa_lock);*/
2219 XShmPutImage( b->xm_visual->display, b->frontxrb->drawable,
2220 b->swapgc,
2221 b->backxrb->ximage, 0, 0,
2222 0, 0, b->mesa_buffer.Width, b->mesa_buffer.Height,
2223 False );
2224 /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/
2225 }
2226 else
2227 #endif
2228 {
2229 /*_glthread_LOCK_MUTEX(_xmesa_lock);*/
2230 XMesaPutImage( b->xm_visual->display, b->frontxrb->drawable,
2231 b->swapgc,
2232 b->backxrb->ximage, 0, 0,
2233 0, 0, b->mesa_buffer.Width, b->mesa_buffer.Height );
2234 /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/
2235 }
2236 }
2237 else {
2238 /* Copy pixmap to window on server */
2239 /*_glthread_LOCK_MUTEX(_xmesa_lock);*/
2240 XMesaCopyArea( b->xm_visual->display,
2241 b->backxrb->pixmap, /* source drawable */
2242 b->frontxrb->drawable, /* dest. drawable */
2243 b->swapgc,
2244 0, 0, b->mesa_buffer.Width, b->mesa_buffer.Height,
2245 0, 0 /* dest region */
2246 );
2247 /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/
2248 }
2249 }
2250 #if !defined(XFree86Server)
2251 XSync( b->xm_visual->display, False );
2252 #endif
2253 }
2254
2255
2256
2257 /*
2258 * Copy sub-region of back buffer to front buffer
2259 */
2260 void XMesaCopySubBuffer( XMesaBuffer b, int x, int y, int width, int height )
2261 {
2262 GET_CURRENT_CONTEXT(ctx);
2263
2264 /* If we're swapping the buffer associated with the current context
2265 * we have to flush any pending rendering commands first.
2266 */
2267 if (ctx && ctx->DrawBuffer == &(b->mesa_buffer))
2268 _mesa_notifySwapBuffers(ctx);
2269
2270 if (!b->backxrb) {
2271 /* single buffered */
2272 return;
2273 }
2274
2275 if (b->db_mode) {
2276 int yTop = b->mesa_buffer.Height - y - height;
2277 #ifdef FX
2278 if (b->FXctx) {
2279 fxMesaSwapBuffers();
2280 if (b->FXwindowHack)
2281 FXgetImage(b);
2282 else
2283 return;
2284 }
2285 #endif
2286 if (b->backxrb->ximage) {
2287 /* Copy Ximage from host's memory to server's window */
2288 #if defined(USE_XSHM) && !defined(XFree86Server)
2289 if (b->shm) {
2290 /* XXX assuming width and height aren't too large! */
2291 XShmPutImage( b->xm_visual->display, b->frontxrb->drawable,
2292 b->swapgc,
2293 b->backxrb->ximage, x, yTop,
2294 x, yTop, width, height, False );
2295 /* wait for finished event??? */
2296 }
2297 else
2298 #endif
2299 {
2300 /* XXX assuming width and height aren't too large! */
2301 XMesaPutImage( b->xm_visual->display, b->frontxrb->drawable,
2302 b->swapgc,
2303 b->backxrb->ximage, x, yTop,
2304 x, yTop, width, height );
2305 }
2306 }
2307 else {
2308 /* Copy pixmap to window on server */
2309 XMesaCopyArea( b->xm_visual->display,
2310 b->backxrb->pixmap, /* source drawable */
2311 b->frontxrb->drawable, /* dest. drawable */
2312 b->swapgc,
2313 x, yTop, width, height, /* source region */
2314 x, yTop /* dest region */
2315 );
2316 }
2317 }
2318 }
2319
2320
2321 /*
2322 * Return a pointer to the XMesa backbuffer Pixmap or XImage. This function
2323 * is a way to get "under the hood" of X/Mesa so one can manipulate the
2324 * back buffer directly.
2325 * Output: pixmap - pointer to back buffer's Pixmap, or 0
2326 * ximage - pointer to back buffer's XImage, or NULL
2327 * Return: GL_TRUE = context is double buffered
2328 * GL_FALSE = context is single buffered
2329 */
2330 #ifndef XFree86Server
2331 GLboolean XMesaGetBackBuffer( XMesaBuffer b,
2332 XMesaPixmap *pixmap,
2333 XMesaImage **ximage )
2334 {
2335 if (b->db_mode) {
2336 if (pixmap)
2337 *pixmap = b->backxrb->pixmap;
2338 if (ximage)
2339 *ximage = b->backxrb->ximage;
2340 return GL_TRUE;
2341 }
2342 else {
2343 *pixmap = 0;
2344 *ximage = NULL;
2345 return GL_FALSE;
2346 }
2347 }
2348 #endif /* XFree86Server */
2349
2350
2351 /*
2352 * Return the depth buffer associated with an XMesaBuffer.
2353 * Input: b - the XMesa buffer handle
2354 * Output: width, height - size of buffer in pixels
2355 * bytesPerValue - bytes per depth value (2 or 4)
2356 * buffer - pointer to depth buffer values
2357 * Return: GL_TRUE or GL_FALSE to indicate success or failure.
2358 */
2359 GLboolean XMesaGetDepthBuffer( XMesaBuffer b, GLint *width, GLint *height,
2360 GLint *bytesPerValue, void **buffer )
2361 {
2362 struct gl_renderbuffer *rb
2363 = b->mesa_buffer.Attachment[BUFFER_DEPTH].Renderbuffer;
2364 if (!rb || !rb->Data) {
2365 *width = 0;
2366 *height = 0;
2367 *bytesPerValue = 0;
2368 *buffer = 0;
2369 return GL_FALSE;
2370 }
2371 else {
2372 *width = b->mesa_buffer.Width;
2373 *height = b->mesa_buffer.Height;
2374 *bytesPerValue = b->mesa_buffer.Visual.depthBits <= 16
2375 ? sizeof(GLushort) : sizeof(GLuint);
2376 *buffer = rb->Data;
2377 return GL_TRUE;
2378 }
2379 }
2380
2381
2382 void XMesaFlush( XMesaContext c )
2383 {
2384 if (c && c->xm_visual) {
2385 #ifdef XFree86Server
2386 /* NOT_NEEDED */
2387 #else
2388 XSync( c->xm_visual->display, False );
2389 #endif
2390 }
2391 }
2392
2393
2394
2395 const char *XMesaGetString( XMesaContext c, int name )
2396 {
2397 (void) c;
2398 if (name==XMESA_VERSION) {
2399 return "5.0";
2400 }
2401 else if (name==XMESA_EXTENSIONS) {
2402 return "";
2403 }
2404 else {
2405 return NULL;
2406 }
2407 }
2408
2409
2410
2411 XMesaBuffer XMesaFindBuffer( XMesaDisplay *dpy, XMesaDrawable d )
2412 {
2413 XMesaBuffer b;
2414 for (b=XMesaBufferList; b; b=b->Next) {
2415 if (b->frontxrb->drawable == d && b->display == dpy) {
2416 return b;
2417 }
2418 }
2419 return NULL;
2420 }
2421
2422
2423 /**
2424 * Free/destroy all XMesaBuffers associated with given display.
2425 */
2426 void xmesa_destroy_buffers_on_display(XMesaDisplay *dpy)
2427 {
2428 XMesaBuffer b, next;
2429 for (b = XMesaBufferList; b; b = next) {
2430 next = b->Next;
2431 if (b->display == dpy) {
2432 free_xmesa_buffer(0, b);
2433 }
2434 }
2435 }
2436
2437
2438 /*
2439 * Look for XMesaBuffers whose X window has been destroyed.
2440 * Deallocate any such XMesaBuffers.
2441 */
2442 void XMesaGarbageCollect( void )
2443 {
2444 XMesaBuffer b, next;
2445 for (b=XMesaBufferList; b; b=next) {
2446 next = b->Next;
2447 if (b->display && b->frontxrb->drawable && b->type == WINDOW) {
2448 #ifdef XFree86Server
2449 /* NOT_NEEDED */
2450 #else
2451 XSync(b->display, False);
2452 if (!window_exists( b->display, b->frontxrb->drawable )) {
2453 /* found a dead window, free the ancillary info */
2454 XMesaDestroyBuffer( b );
2455 }
2456 #endif
2457 }
2458 }
2459 }
2460
2461
2462 void XMesaReset( void )
2463 {
2464 while (XMesaBufferList)
2465 XMesaDestroyBuffer(XMesaBufferList);
2466
2467 XMesaBufferList = NULL;
2468 }
2469
2470
2471 unsigned long XMesaDitherColor( XMesaContext xmesa, GLint x, GLint y,
2472 GLfloat red, GLfloat green,
2473 GLfloat blue, GLfloat alpha )
2474 {
2475 GLcontext *ctx = &xmesa->mesa;
2476 GLint r = (GLint) (red * 255.0F);
2477 GLint g = (GLint) (green * 255.0F);
2478 GLint b = (GLint) (blue * 255.0F);
2479 GLint a = (GLint) (alpha * 255.0F);
2480
2481 switch (xmesa->pixelformat) {
2482 case PF_Index:
2483 return 0;
2484 case PF_Truecolor:
2485 {
2486 unsigned long p;
2487 PACK_TRUECOLOR( p, r, g, b );
2488 return p;
2489 }
2490 case PF_8A8B8G8R:
2491 return PACK_8A8B8G8R( r, g, b, a );
2492 case PF_8A8R8G8B:
2493 return PACK_8A8R8G8B( r, g, b, a );
2494 case PF_8R8G8B:
2495 return PACK_8R8G8B( r, g, b );
2496 case PF_5R6G5B:
2497 return PACK_5R6G5B( r, g, b );
2498 case PF_Dither:
2499 {
2500 DITHER_SETUP;
2501 return DITHER( x, y, r, g, b );
2502 }
2503 case PF_1Bit:
2504 /* 382 = (3*255)/2 */
2505 return ((r+g+b) > 382) ^ xmesa->xm_visual->bitFlip;
2506 case PF_HPCR:
2507 return DITHER_HPCR(x, y, r, g, b);
2508 case PF_Lookup:
2509 {
2510 LOOKUP_SETUP;
2511 return LOOKUP( r, g, b );
2512 }
2513 case PF_Grayscale:
2514 return GRAY_RGB( r, g, b );
2515 case PF_Dither_5R6G5B:
2516 /* fall through */
2517 case PF_Dither_True:
2518 {
2519 unsigned long p;
2520 PACK_TRUEDITHER(p, x, y, r, g, b);
2521 return p;
2522 }
2523 default:
2524 _mesa_problem(NULL, "Bad pixel format in XMesaDitherColor");
2525 }
2526 return 0;
2527 }
2528
2529
2530 /*
2531 * This is typically called when the window size changes and we need
2532 * to reallocate the buffer's back/depth/stencil/accum buffers.
2533 */
2534 void
2535 XMesaResizeBuffers( XMesaBuffer b )
2536 {
2537 GET_CURRENT_CONTEXT(ctx);
2538 XMesaContext xmctx = XMESA_CONTEXT(ctx);
2539 xmesa_check_and_update_buffer_size(xmctx, b);
2540 }
2541