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[mesa.git] / src / mesa / drivers / x11 / xm_api.c
1 /* $Id: xm_api.c,v 1.54 2003/03/01 01:50:24 brianp Exp $ */
2
3 /*
4 * Mesa 3-D graphics library
5 * Version: 5.0.1
6 *
7 * Copyright (C) 1999-2003 Brian Paul All Rights Reserved.
8 *
9 * Permission is hereby granted, free of charge, to any person obtaining a
10 * copy of this software and associated documentation files (the "Software"),
11 * to deal in the Software without restriction, including without limitation
12 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
13 * and/or sell copies of the Software, and to permit persons to whom the
14 * Software is furnished to do so, subject to the following conditions:
15 *
16 * The above copyright notice and this permission notice shall be included
17 * in all copies or substantial portions of the Software.
18 *
19 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
20 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
21 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
22 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
23 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
24 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25 */
26 /* $XFree86: xc/extras/Mesa/src/X/xm_api.c,v 1.2 2002/02/26 23:37:31 tsi Exp $ */
27
28 /*
29 * This file contains the implementations of all the XMesa* functions.
30 *
31 *
32 * NOTES:
33 *
34 * The window coordinate system origin (0,0) is in the lower-left corner
35 * of the window. X11's window coordinate origin is in the upper-left
36 * corner of the window. Therefore, most drawing functions in this
37 * file have to flip Y coordinates.
38 *
39 * Define USE_XSHM in the Makefile with -DUSE_XSHM if you want to compile
40 * in support for the MIT Shared Memory extension. If enabled, when you
41 * use an Ximage for the back buffer in double buffered mode, the "swap"
42 * operation will be faster. You must also link with -lXext.
43 *
44 * Byte swapping: If the Mesa host and the X display use a different
45 * byte order then there's some trickiness to be aware of when using
46 * XImages. The byte ordering used for the XImage is that of the X
47 * display, not the Mesa host.
48 * The color-to-pixel encoding for True/DirectColor must be done
49 * according to the display's visual red_mask, green_mask, and blue_mask.
50 * If XPutPixel is used to put a pixel into an XImage then XPutPixel will
51 * do byte swapping if needed. If one wants to directly "poke" the pixel
52 * into the XImage's buffer then the pixel must be byte swapped first. In
53 * Mesa, when byte swapping is needed we use the PF_TRUECOLOR pixel format
54 * and use XPutPixel everywhere except in the implementation of
55 * glClear(GL_COLOR_BUFFER_BIT). We want this function to be fast so
56 * instead of using XPutPixel we "poke" our values after byte-swapping
57 * the clear pixel value if needed.
58 *
59 */
60
61 #ifdef __CYGWIN__
62 #undef WIN32
63 #undef __WIN32__
64 #endif
65
66 #include "glxheader.h"
67 #include "GL/xmesa.h"
68 #include "xmesaP.h"
69 #include "context.h"
70 #include "extensions.h"
71 #include "glthread.h"
72 #include "imports.h"
73 #include "matrix.h"
74 #include "mtypes.h"
75 #include "macros.h"
76 #include "texformat.h"
77 #include "texstore.h"
78 #include "swrast/swrast.h"
79 #include "swrast_setup/swrast_setup.h"
80 #include "array_cache/acache.h"
81 #include "tnl/tnl.h"
82
83 #ifndef GLX_NONE_EXT
84 #define GLX_NONE_EXT 0x8000
85 #endif
86
87
88 /*
89 * Global X driver lock
90 */
91 _glthread_Mutex _xmesa_lock;
92
93
94
95 /*
96 * Lookup tables for HPCR pixel format:
97 */
98 static short hpcr_rgbTbl[3][256] = {
99 {
100 16, 16, 17, 17, 18, 18, 19, 19, 20, 20, 21, 21, 22, 22, 23, 23,
101 24, 24, 25, 25, 26, 26, 27, 27, 28, 28, 29, 29, 30, 30, 31, 31,
102 32, 32, 33, 33, 34, 34, 35, 35, 36, 36, 37, 37, 38, 38, 39, 39,
103 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
104 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
105 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
106 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95,
107 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111,
108 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127,
109 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143,
110 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159,
111 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175,
112 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191,
113 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207,
114 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223,
115 224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239
116 },
117 {
118 16, 16, 17, 17, 18, 18, 19, 19, 20, 20, 21, 21, 22, 22, 23, 23,
119 24, 24, 25, 25, 26, 26, 27, 27, 28, 28, 29, 29, 30, 30, 31, 31,
120 32, 32, 33, 33, 34, 34, 35, 35, 36, 36, 37, 37, 38, 38, 39, 39,
121 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
122 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
123 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
124 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95,
125 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111,
126 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127,
127 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143,
128 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159,
129 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175,
130 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191,
131 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207,
132 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223,
133 224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 236, 237, 238, 239
134 },
135 {
136 32, 32, 33, 33, 34, 34, 35, 35, 36, 36, 37, 37, 38, 38, 39, 39,
137 40, 40, 41, 41, 42, 42, 43, 43, 44, 44, 45, 45, 46, 46, 47, 47,
138 48, 48, 49, 49, 50, 50, 51, 51, 52, 52, 53, 53, 54, 54, 55, 55,
139 56, 56, 57, 57, 58, 58, 59, 59, 60, 60, 61, 61, 62, 62, 63, 63,
140 64, 64, 65, 65, 66, 66, 67, 67, 68, 68, 69, 69, 70, 70, 71, 71,
141 72, 72, 73, 73, 74, 74, 75, 75, 76, 76, 77, 77, 78, 78, 79, 79,
142 80, 80, 81, 81, 82, 82, 83, 83, 84, 84, 85, 85, 86, 86, 87, 87,
143 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95,
144 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111,
145 112, 113, 114, 115, 116, 117, 118, 119, 120, 121, 122, 123, 124, 125, 126, 127,
146 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143,
147 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159,
148 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171, 172, 173, 174, 175,
149 176, 177, 178, 179, 180, 181, 182, 183, 184, 185, 186, 187, 188, 189, 190, 191,
150 192, 193, 194, 195, 196, 197, 198, 199, 200, 201, 202, 203, 204, 205, 206, 207,
151 208, 209, 210, 211, 212, 213, 214, 215, 216, 217, 218, 219, 220, 221, 222, 223
152 }
153 };
154
155
156
157 /**********************************************************************/
158 /***** X Utility Functions *****/
159 /**********************************************************************/
160
161
162 /*
163 * Return the host's byte order as LSBFirst or MSBFirst ala X.
164 */
165 #ifndef XFree86Server
166 static int host_byte_order( void )
167 {
168 int i = 1;
169 char *cptr = (char *) &i;
170 return (*cptr==1) ? LSBFirst : MSBFirst;
171 }
172 #endif
173
174
175 /*
176 * Error handling.
177 */
178 #ifndef XFree86Server
179 static int mesaXErrorFlag = 0;
180
181 static int mesaHandleXError( XMesaDisplay *dpy, XErrorEvent *event )
182 {
183 (void) dpy;
184 (void) event;
185 mesaXErrorFlag = 1;
186 return 0;
187 }
188 #endif
189
190
191 /*
192 * Check if the X Shared Memory extension is available.
193 * Return: 0 = not available
194 * 1 = shared XImage support available
195 * 2 = shared Pixmap support available also
196 */
197 #ifndef XFree86Server
198 static int check_for_xshm( XMesaDisplay *display )
199 {
200 #ifdef USE_XSHM
201 int major, minor, ignore;
202 Bool pixmaps;
203
204 if (XQueryExtension( display, "MIT-SHM", &ignore, &ignore, &ignore )) {
205 if (XShmQueryVersion( display, &major, &minor, &pixmaps )==True) {
206 return (pixmaps==True) ? 2 : 1;
207 }
208 else {
209 return 0;
210 }
211 }
212 else {
213 return 0;
214 }
215 #else
216 /* Can't compile XSHM support */
217 return 0;
218 #endif
219 }
220 #endif
221
222
223 /*
224 * Return the width and height of the given drawable.
225 */
226 static void get_drawable_size( XMesaDisplay *dpy, XMesaDrawable d,
227 unsigned int *width, unsigned int *height)
228 {
229 #ifdef XFree86Server
230 (void) dpy;
231 *width = d->width;
232 *height = d->height;
233 #else
234 Window root;
235 int x, y;
236 unsigned int bw, depth;
237
238 _glthread_LOCK_MUTEX(_xmesa_lock);
239 XGetGeometry( dpy, d, &root, &x, &y, width, height, &bw, &depth );
240 _glthread_UNLOCK_MUTEX(_xmesa_lock);
241 #endif
242 }
243
244
245 /*
246 * Apply gamma correction to an intensity value in [0..max]. Return the
247 * new intensity value.
248 */
249 static GLint gamma_adjust( GLfloat gamma, GLint value, GLint max )
250 {
251 if (gamma == 1.0) {
252 return value;
253 }
254 else {
255 double x = (double) value / (double) max;
256 return IROUND_POS((GLfloat) max * _mesa_pow(x, 1.0F/gamma));
257 }
258 }
259
260
261
262 /*
263 * Return the true number of bits per pixel for XImages.
264 * For example, if we request a 24-bit deep visual we may actually need/get
265 * 32bpp XImages. This function returns the appropriate bpp.
266 * Input: dpy - the X display
267 * visinfo - desribes the visual to be used for XImages
268 * Return: true number of bits per pixel for XImages
269 */
270 #ifdef XFree86Server
271
272 static int bits_per_pixel( XMesaVisual xmv )
273 {
274 XMesaVisualInfo visinfo = xmv->visinfo;
275 const int depth = visinfo->nplanes;
276 int i;
277 for (i = 0; i < screenInfo.numPixmapFormats; i++) {
278 if (screenInfo.formats[i].depth == depth)
279 return screenInfo.formats[i].bitsPerPixel;
280 }
281 return depth; /* should never get here, but this should be safe */
282 }
283
284 #else
285
286 static int bits_per_pixel( XMesaVisual xmv )
287 {
288 XMesaDisplay *dpy = xmv->display;
289 XMesaVisualInfo visinfo = xmv->visinfo;
290 XMesaImage *img;
291 int bitsPerPixel;
292 /* Create a temporary XImage */
293 img = XCreateImage( dpy, visinfo->visual, visinfo->depth,
294 ZPixmap, 0, /*format, offset*/
295 (char*) MALLOC(8), /*data*/
296 1, 1, /*width, height*/
297 32, /*bitmap_pad*/
298 0 /*bytes_per_line*/
299 );
300 assert(img);
301 /* grab the bits/pixel value */
302 bitsPerPixel = img->bits_per_pixel;
303 /* free the XImage */
304 FREE( img->data );
305 img->data = NULL;
306 XMesaDestroyImage( img );
307 return bitsPerPixel;
308 }
309 #endif
310
311
312
313 /*
314 * Determine if a given X window ID is valid (window exists).
315 * Do this by calling XGetWindowAttributes() for the window and
316 * checking if we catch an X error.
317 * Input: dpy - the display
318 * win - the window to check for existance
319 * Return: GL_TRUE - window exists
320 * GL_FALSE - window doesn't exist
321 */
322 #ifndef XFree86Server
323 static GLboolean WindowExistsFlag;
324
325 static int window_exists_err_handler( XMesaDisplay* dpy, XErrorEvent* xerr )
326 {
327 (void) dpy;
328 if (xerr->error_code == BadWindow) {
329 WindowExistsFlag = GL_FALSE;
330 }
331 return 0;
332 }
333
334 static GLboolean window_exists( XMesaDisplay *dpy, Window win )
335 {
336 XWindowAttributes wa;
337 int (*old_handler)( XMesaDisplay*, XErrorEvent* );
338 WindowExistsFlag = GL_TRUE;
339 old_handler = XSetErrorHandler(window_exists_err_handler);
340 XGetWindowAttributes( dpy, win, &wa ); /* dummy request */
341 XSetErrorHandler(old_handler);
342 return WindowExistsFlag;
343 }
344 #endif
345
346
347
348 /**********************************************************************/
349 /***** Linked list of XMesaBuffers *****/
350 /**********************************************************************/
351
352 static XMesaBuffer XMesaBufferList = NULL;
353
354
355 /* Allocate a new XMesaBuffer, add to linked list */
356 static XMesaBuffer alloc_xmesa_buffer(void)
357 {
358 XMesaBuffer b = (XMesaBuffer) CALLOC_STRUCT(xmesa_buffer);
359 if (b) {
360 b->Next = XMesaBufferList;
361 XMesaBufferList = b;
362 }
363 return b;
364 }
365
366
367 /*
368 * Find an XMesaBuffer by matching X display and colormap but NOT matching
369 * the notThis buffer.
370 */
371 static XMesaBuffer find_xmesa_buffer(XMesaDisplay *dpy,
372 XMesaColormap cmap,
373 XMesaBuffer notThis)
374 {
375 XMesaBuffer b;
376 for (b=XMesaBufferList; b; b=b->Next) {
377 if (b->display==dpy && b->cmap==cmap && b!=notThis) {
378 return b;
379 }
380 }
381 return NULL;
382 }
383
384
385 /*
386 * Free an XMesaBuffer, remove from linked list, perhaps free X colormap
387 * entries.
388 */
389 static void free_xmesa_buffer(int client, XMesaBuffer buffer)
390 {
391 XMesaBuffer prev = NULL, b;
392 (void) client;
393 for (b=XMesaBufferList; b; b=b->Next) {
394 if (b==buffer) {
395 /* unlink bufer from list */
396 if (prev)
397 prev->Next = buffer->Next;
398 else
399 XMesaBufferList = buffer->Next;
400 /* Check to free X colors */
401 if (buffer->num_alloced>0) {
402 /* If no other buffer uses this X colormap then free the colors. */
403 if (!find_xmesa_buffer(buffer->display, buffer->cmap, buffer)) {
404 #ifdef XFree86Server
405 (void)FreeColors(buffer->cmap, client,
406 buffer->num_alloced, buffer->alloced_colors,
407 0);
408 #else
409 XFreeColors(buffer->display, buffer->cmap,
410 buffer->alloced_colors, buffer->num_alloced, 0);
411 #endif
412 }
413 }
414
415 _mesa_free_framebuffer_data(&buffer->mesa_buffer);
416 FREE(buffer);
417
418 return;
419 }
420 /* continue search */
421 prev = b;
422 }
423 /* buffer not found in XMesaBufferList */
424 _mesa_problem(NULL,"free_xmesa_buffer() - buffer not found\n");
425 }
426
427
428 /* Copy X color table stuff from one XMesaBuffer to another. */
429 static void copy_colortable_info(XMesaBuffer dst, const XMesaBuffer src)
430 {
431 MEMCPY(dst->color_table, src->color_table, sizeof(src->color_table));
432 MEMCPY(dst->pixel_to_r, src->pixel_to_r, sizeof(src->pixel_to_r));
433 MEMCPY(dst->pixel_to_g, src->pixel_to_g, sizeof(src->pixel_to_g));
434 MEMCPY(dst->pixel_to_b, src->pixel_to_b, sizeof(src->pixel_to_b));
435 dst->num_alloced = src->num_alloced;
436 MEMCPY(dst->alloced_colors, src->alloced_colors,
437 sizeof(src->alloced_colors));
438 }
439
440
441
442 /**********************************************************************/
443 /***** Misc Private Functions *****/
444 /**********************************************************************/
445
446
447 /*
448 * Return number of bits set in n.
449 */
450 static int bitcount( unsigned long n )
451 {
452 int bits;
453 for (bits=0; n>0; n=n>>1) {
454 if (n&1) {
455 bits++;
456 }
457 }
458 return bits;
459 }
460
461
462
463 /*
464 * Allocate a shared memory XImage back buffer for the given XMesaBuffer.
465 * Return: GL_TRUE if success, GL_FALSE if error
466 */
467 #ifndef XFree86Server
468 static GLboolean alloc_shm_back_buffer( XMesaBuffer b )
469 {
470 #ifdef USE_XSHM
471 /*
472 * We have to do a _lot_ of error checking here to be sure we can
473 * really use the XSHM extension. It seems different servers trigger
474 * errors at different points if the extension won't work. Therefore
475 * we have to be very careful...
476 */
477 GC gc;
478 int (*old_handler)( XMesaDisplay *, XErrorEvent * );
479
480 b->backimage = XShmCreateImage( b->xm_visual->display,
481 b->xm_visual->visinfo->visual,
482 b->xm_visual->visinfo->depth,
483 ZPixmap, NULL, &b->shminfo,
484 b->width, b->height );
485 if (b->backimage == NULL) {
486 _mesa_warning(NULL, "alloc_back_buffer: Shared memory error (XShmCreateImage), disabling.");
487 b->shm = 0;
488 return GL_FALSE;
489 }
490
491 b->shminfo.shmid = shmget( IPC_PRIVATE, b->backimage->bytes_per_line
492 * b->backimage->height, IPC_CREAT|0777 );
493 if (b->shminfo.shmid < 0) {
494 _mesa_warning(NULL, "shmget failed while allocating back buffer");
495 XDestroyImage( b->backimage );
496 b->backimage = NULL;
497 _mesa_warning(NULL, "alloc_back_buffer: Shared memory error (shmget), disabling.");
498 b->shm = 0;
499 return GL_FALSE;
500 }
501
502 b->shminfo.shmaddr = b->backimage->data
503 = (char*)shmat( b->shminfo.shmid, 0, 0 );
504 if (b->shminfo.shmaddr == (char *) -1) {
505 _mesa_warning(NULL, "shmat() failed while allocating back buffer");
506 XDestroyImage( b->backimage );
507 shmctl( b->shminfo.shmid, IPC_RMID, 0 );
508 b->backimage = NULL;
509 _mesa_warning(NULL, "alloc_back_buffer: Shared memory error (shmat), disabling.");
510 b->shm = 0;
511 return GL_FALSE;
512 }
513
514 b->shminfo.readOnly = False;
515 mesaXErrorFlag = 0;
516 old_handler = XSetErrorHandler( mesaHandleXError );
517 /* This may trigger the X protocol error we're ready to catch: */
518 XShmAttach( b->xm_visual->display, &b->shminfo );
519 XSync( b->xm_visual->display, False );
520
521 if (mesaXErrorFlag) {
522 /* we are on a remote display, this error is normal, don't print it */
523 XFlush( b->xm_visual->display );
524 mesaXErrorFlag = 0;
525 XDestroyImage( b->backimage );
526 shmdt( b->shminfo.shmaddr );
527 shmctl( b->shminfo.shmid, IPC_RMID, 0 );
528 b->backimage = NULL;
529 b->shm = 0;
530 (void) XSetErrorHandler( old_handler );
531 return GL_FALSE;
532 }
533
534 shmctl( b->shminfo.shmid, IPC_RMID, 0 ); /* nobody else needs it */
535
536 /* Finally, try an XShmPutImage to be really sure the extension works */
537 gc = XCreateGC( b->xm_visual->display, b->frontbuffer, 0, NULL );
538 XShmPutImage( b->xm_visual->display, b->frontbuffer, gc,
539 b->backimage, 0, 0, 0, 0, 1, 1 /*one pixel*/, False );
540 XSync( b->xm_visual->display, False );
541 XFreeGC( b->xm_visual->display, gc );
542 (void) XSetErrorHandler( old_handler );
543 if (mesaXErrorFlag) {
544 XFlush( b->xm_visual->display );
545 mesaXErrorFlag = 0;
546 XDestroyImage( b->backimage );
547 shmdt( b->shminfo.shmaddr );
548 shmctl( b->shminfo.shmid, IPC_RMID, 0 );
549 b->backimage = NULL;
550 b->shm = 0;
551 return GL_FALSE;
552 }
553
554 if (b->backimage) {
555 int height = b->backimage->height;
556 /* Needed by PIXELADDR1 macro */
557 b->ximage_width1 = b->backimage->bytes_per_line;
558 b->ximage_origin1 = (GLubyte *) b->backimage->data
559 + b->ximage_width1 * (height-1);
560 /* Needed by PIXELADDR2 macro */
561 b->ximage_width2 = b->backimage->bytes_per_line / 2;
562 b->ximage_origin2 = (GLushort *) b->backimage->data
563 + b->ximage_width2 * (height-1);
564 /* Needed by PIXELADDR3 macro */
565 b->ximage_width3 = b->backimage->bytes_per_line;
566 b->ximage_origin3 = (GLubyte *) b->backimage->data
567 + b->ximage_width3 * (height-1);
568 /* Needed by PIXELADDR4 macro */
569 b->ximage_width4 = b->backimage->width;
570 b->ximage_origin4 = (GLuint *) b->backimage->data
571 + b->ximage_width4 * (height-1);
572 }
573
574 return GL_TRUE;
575 #else
576 /* Can't compile XSHM support */
577 return GL_FALSE;
578 #endif
579 }
580 #endif
581
582
583
584 /*
585 * Setup an off-screen pixmap or Ximage to use as the back buffer.
586 * Input: b - the X/Mesa buffer
587 */
588 void xmesa_alloc_back_buffer( XMesaBuffer b )
589 {
590 if (b->db_state==BACK_XIMAGE) {
591 /* Deallocate the old backimage, if any */
592 if (b->backimage) {
593 #if defined(USE_XSHM) && !defined(XFree86Server)
594 if (b->shm) {
595 XShmDetach( b->xm_visual->display, &b->shminfo );
596 XDestroyImage( b->backimage );
597 shmdt( b->shminfo.shmaddr );
598 }
599 else
600 #endif
601 XMesaDestroyImage( b->backimage );
602 b->backimage = NULL;
603 }
604
605 /* Allocate new back buffer */
606 #ifdef XFree86Server
607 {
608 /* Allocate a regular XImage for the back buffer. */
609 b->backimage = XMesaCreateImage(b->xm_visual->BitsPerPixel,
610 b->width, b->height, NULL);
611 #else
612 if (b->shm==0 || alloc_shm_back_buffer(b)==GL_FALSE) {
613 /* Allocate a regular XImage for the back buffer. */
614 b->backimage = XCreateImage( b->xm_visual->display,
615 b->xm_visual->visinfo->visual,
616 GET_VISUAL_DEPTH(b->xm_visual),
617 ZPixmap, 0, /* format, offset */
618 NULL, b->width, b->height,
619 8, 0 ); /* pad, bytes_per_line */
620 #endif
621 if (!b->backimage) {
622 _mesa_warning(NULL, "alloc_back_buffer: XCreateImage failed.");
623 }
624 b->backimage->data = (char *) MALLOC( b->backimage->height
625 * b->backimage->bytes_per_line );
626 if (!b->backimage->data) {
627 _mesa_warning(NULL, "alloc_back_buffer: MALLOC failed.");
628 XMesaDestroyImage( b->backimage );
629 b->backimage = NULL;
630 }
631 }
632 b->backpixmap = None;
633 }
634 else if (b->db_state==BACK_PIXMAP) {
635 XMesaPixmap old_pixmap = b->backpixmap;
636 /* Free the old back pixmap */
637 if (b->backpixmap) {
638 XMesaFreePixmap( b->xm_visual->display, b->backpixmap );
639 }
640 /* Allocate new back pixmap */
641 b->backpixmap = XMesaCreatePixmap( b->xm_visual->display, b->frontbuffer,
642 b->width, b->height,
643 GET_VISUAL_DEPTH(b->xm_visual) );
644 b->backimage = NULL;
645 /* update other references to backpixmap */
646 if (b->buffer==(XMesaDrawable)old_pixmap) {
647 b->buffer = (XMesaDrawable)b->backpixmap;
648 }
649 }
650 }
651
652
653
654 /*
655 * A replacement for XAllocColor. This function should never
656 * fail to allocate a color. When XAllocColor fails, we return
657 * the nearest matching color. If we have to allocate many colors
658 * this function isn't too efficient; the XQueryColors() could be
659 * done just once.
660 * Written by Michael Pichler, Brian Paul, Mark Kilgard
661 * Input: dpy - X display
662 * cmap - X colormap
663 * cmapSize - size of colormap
664 * In/Out: color - the XColor struct
665 * Output: exact - 1=exact color match, 0=closest match
666 * alloced - 1=XAlloc worked, 0=XAlloc failed
667 */
668 static void
669 noFaultXAllocColor( int client,
670 XMesaDisplay *dpy,
671 XMesaColormap cmap,
672 int cmapSize,
673 XMesaColor *color,
674 int *exact, int *alloced )
675 {
676 #ifdef XFree86Server
677 Pixel *ppixIn;
678 xrgb *ctable;
679 #else
680 /* we'll try to cache ctable for better remote display performance */
681 static Display *prevDisplay = NULL;
682 static XMesaColormap prevCmap = 0;
683 static int prevCmapSize = 0;
684 static XMesaColor *ctable = NULL;
685 #endif
686 XMesaColor subColor;
687 int i, bestmatch;
688 double mindist; /* 3*2^16^2 exceeds long int precision. */
689
690 (void) client;
691
692 /* First try just using XAllocColor. */
693 #ifdef XFree86Server
694 if (AllocColor(cmap,
695 &color->red, &color->green, &color->blue,
696 &color->pixel,
697 client) == Success) {
698 #else
699 if (XAllocColor(dpy, cmap, color)) {
700 #endif
701 *exact = 1;
702 *alloced = 1;
703 return;
704 }
705
706 /* Alloc failed, search for closest match */
707
708 /* Retrieve color table entries. */
709 /* XXX alloca candidate. */
710 #ifdef XFree86Server
711 ppixIn = (Pixel *) MALLOC(cmapSize * sizeof(Pixel));
712 ctable = (xrgb *) MALLOC(cmapSize * sizeof(xrgb));
713 for (i = 0; i < cmapSize; i++) {
714 ppixIn[i] = i;
715 }
716 QueryColors(cmap, cmapSize, ppixIn, ctable);
717 #else
718 if (prevDisplay != dpy || prevCmap != cmap
719 || prevCmapSize != cmapSize || !ctable) {
720 /* free previously cached color table */
721 if (ctable)
722 FREE(ctable);
723 /* Get the color table from X */
724 ctable = (XMesaColor *) MALLOC(cmapSize * sizeof(XMesaColor));
725 assert(ctable);
726 for (i = 0; i < cmapSize; i++) {
727 ctable[i].pixel = i;
728 }
729 XQueryColors(dpy, cmap, ctable, cmapSize);
730 prevDisplay = dpy;
731 prevCmap = cmap;
732 prevCmapSize = cmapSize;
733 }
734 #endif
735
736 /* Find best match. */
737 bestmatch = -1;
738 mindist = 0.0;
739 for (i = 0; i < cmapSize; i++) {
740 double dr = 0.30 * ((double) color->red - (double) ctable[i].red);
741 double dg = 0.59 * ((double) color->green - (double) ctable[i].green);
742 double db = 0.11 * ((double) color->blue - (double) ctable[i].blue);
743 double dist = dr * dr + dg * dg + db * db;
744 if (bestmatch < 0 || dist < mindist) {
745 bestmatch = i;
746 mindist = dist;
747 }
748 }
749
750 /* Return result. */
751 subColor.red = ctable[bestmatch].red;
752 subColor.green = ctable[bestmatch].green;
753 subColor.blue = ctable[bestmatch].blue;
754 /* Try to allocate the closest match color. This should only
755 * fail if the cell is read/write. Otherwise, we're incrementing
756 * the cell's reference count.
757 */
758 #ifdef XFree86Server
759 if (AllocColor(cmap,
760 &subColor.red, &subColor.green, &subColor.blue,
761 &subColor.pixel,
762 client) == Success) {
763 #else
764 if (XAllocColor(dpy, cmap, &subColor)) {
765 #endif
766 *alloced = 1;
767 }
768 else {
769 /* do this to work around a problem reported by Frank Ortega */
770 subColor.pixel = (unsigned long) bestmatch;
771 subColor.red = ctable[bestmatch].red;
772 subColor.green = ctable[bestmatch].green;
773 subColor.blue = ctable[bestmatch].blue;
774 subColor.flags = DoRed | DoGreen | DoBlue;
775 *alloced = 0;
776 }
777 #ifdef XFree86Server
778 FREE(ppixIn);
779 FREE(ctable);
780 #else
781 /* don't free table, save it for next time */
782 #endif
783
784 *color = subColor;
785 *exact = 0;
786 }
787
788
789
790
791 /*
792 * Do setup for PF_GRAYSCALE pixel format.
793 * Note that buffer may be NULL.
794 */
795 static GLboolean setup_grayscale( int client, XMesaVisual v,
796 XMesaBuffer buffer, XMesaColormap cmap )
797 {
798 if (GET_VISUAL_DEPTH(v)<4 || GET_VISUAL_DEPTH(v)>16) {
799 return GL_FALSE;
800 }
801
802 if (buffer) {
803 XMesaBuffer prevBuffer;
804
805 if (!cmap) {
806 return GL_FALSE;
807 }
808
809 prevBuffer = find_xmesa_buffer(v->display, cmap, buffer);
810 if (prevBuffer &&
811 (buffer->xm_visual->mesa_visual.rgbMode ==
812 prevBuffer->xm_visual->mesa_visual.rgbMode)) {
813 /* Copy colormap stuff from previous XMesaBuffer which uses same
814 * X colormap. Do this to avoid time spent in noFaultXAllocColor.
815 */
816 copy_colortable_info(buffer, prevBuffer);
817 }
818 else {
819 /* Allocate 256 shades of gray */
820 int gray;
821 int colorsfailed = 0;
822 for (gray=0;gray<256;gray++) {
823 GLint r = gamma_adjust( v->RedGamma, gray, 255 );
824 GLint g = gamma_adjust( v->GreenGamma, gray, 255 );
825 GLint b = gamma_adjust( v->BlueGamma, gray, 255 );
826 int exact, alloced;
827 XMesaColor xcol;
828 xcol.red = (r << 8) | r;
829 xcol.green = (g << 8) | g;
830 xcol.blue = (b << 8) | b;
831 noFaultXAllocColor( client, v->display,
832 cmap, GET_COLORMAP_SIZE(v),
833 &xcol, &exact, &alloced );
834 if (!exact) {
835 colorsfailed++;
836 }
837 if (alloced) {
838 assert(buffer->num_alloced<256);
839 buffer->alloced_colors[buffer->num_alloced] = xcol.pixel;
840 buffer->num_alloced++;
841 }
842
843 /*OLD
844 assert(gray < 576);
845 buffer->color_table[gray*3+0] = xcol.pixel;
846 buffer->color_table[gray*3+1] = xcol.pixel;
847 buffer->color_table[gray*3+2] = xcol.pixel;
848 assert(xcol.pixel < 65536);
849 buffer->pixel_to_r[xcol.pixel] = gray * 30 / 100;
850 buffer->pixel_to_g[xcol.pixel] = gray * 59 / 100;
851 buffer->pixel_to_b[xcol.pixel] = gray * 11 / 100;
852 */
853 buffer->color_table[gray] = xcol.pixel;
854 assert(xcol.pixel < 65536);
855 buffer->pixel_to_r[xcol.pixel] = gray;
856 buffer->pixel_to_g[xcol.pixel] = gray;
857 buffer->pixel_to_b[xcol.pixel] = gray;
858 }
859
860 if (colorsfailed && _mesa_getenv("MESA_DEBUG")) {
861 _mesa_warning(NULL,
862 "Note: %d out of 256 needed colors do not match exactly.\n",
863 colorsfailed );
864 }
865 }
866 }
867
868 v->dithered_pf = PF_Grayscale;
869 v->undithered_pf = PF_Grayscale;
870 return GL_TRUE;
871 }
872
873
874
875 /*
876 * Setup RGB rendering for a window with a PseudoColor, StaticColor,
877 * or 8-bit TrueColor visual visual. We try to allocate a palette of 225
878 * colors (5 red, 9 green, 5 blue) and dither to approximate a 24-bit RGB
879 * color. While this function was originally designed just for 8-bit
880 * visuals, it has also proven to work from 4-bit up to 16-bit visuals.
881 * Dithering code contributed by Bob Mercier.
882 */
883 static GLboolean setup_dithered_color( int client, XMesaVisual v,
884 XMesaBuffer buffer, XMesaColormap cmap )
885 {
886 if (GET_VISUAL_DEPTH(v)<4 || GET_VISUAL_DEPTH(v)>16) {
887 return GL_FALSE;
888 }
889
890 if (buffer) {
891 XMesaBuffer prevBuffer;
892
893 if (!cmap) {
894 return GL_FALSE;
895 }
896
897 prevBuffer = find_xmesa_buffer(v->display, cmap, buffer);
898 if (prevBuffer &&
899 (buffer->xm_visual->mesa_visual.rgbMode ==
900 prevBuffer->xm_visual->mesa_visual.rgbMode)) {
901 /* Copy colormap stuff from previous, matching XMesaBuffer.
902 * Do this to avoid time spent in noFaultXAllocColor.
903 */
904 copy_colortable_info(buffer, prevBuffer);
905 }
906 else {
907 /* Allocate X colors and initialize color_table[], red_table[], etc */
908 int r, g, b, i;
909 int colorsfailed = 0;
910 for (r = 0; r < DITH_R; r++) {
911 for (g = 0; g < DITH_G; g++) {
912 for (b = 0; b < DITH_B; b++) {
913 XMesaColor xcol;
914 int exact, alloced;
915 xcol.red =gamma_adjust(v->RedGamma, r*65535/(DITH_R-1),65535);
916 xcol.green=gamma_adjust(v->GreenGamma, g*65535/(DITH_G-1),65535);
917 xcol.blue =gamma_adjust(v->BlueGamma, b*65535/(DITH_B-1),65535);
918 noFaultXAllocColor( client, v->display,
919 cmap, GET_COLORMAP_SIZE(v),
920 &xcol, &exact, &alloced );
921 if (!exact) {
922 colorsfailed++;
923 }
924 if (alloced) {
925 assert(buffer->num_alloced<256);
926 buffer->alloced_colors[buffer->num_alloced] = xcol.pixel;
927 buffer->num_alloced++;
928 }
929 i = DITH_MIX( r, g, b );
930 assert(i < 576);
931 buffer->color_table[i] = xcol.pixel;
932 assert(xcol.pixel < 65536);
933 buffer->pixel_to_r[xcol.pixel] = r * 255 / (DITH_R-1);
934 buffer->pixel_to_g[xcol.pixel] = g * 255 / (DITH_G-1);
935 buffer->pixel_to_b[xcol.pixel] = b * 255 / (DITH_B-1);
936 }
937 }
938 }
939
940 if (colorsfailed && _mesa_getenv("MESA_DEBUG")) {
941 _mesa_warning(NULL,
942 "Note: %d out of %d needed colors do not match exactly.\n",
943 colorsfailed, DITH_R * DITH_G * DITH_B );
944 }
945 }
946 }
947
948 v->dithered_pf = PF_Dither;
949 v->undithered_pf = PF_Lookup;
950 return GL_TRUE;
951 }
952
953
954 /*
955 * Setup for Hewlett Packard Color Recovery 8-bit TrueColor mode.
956 * HPCR simulates 24-bit color fidelity with an 8-bit frame buffer.
957 * Special dithering tables have to be initialized.
958 */
959 static void setup_8bit_hpcr( XMesaVisual v )
960 {
961 /* HP Color Recovery contributed by: Alex De Bruyn (ad@lms.be)
962 * To work properly, the atom _HP_RGB_SMOOTH_MAP_LIST must be defined
963 * on the root window AND the colormap obtainable by XGetRGBColormaps
964 * for that atom must be set on the window. (see also tkInitWindow)
965 * If that colormap is not set, the output will look stripy.
966 */
967
968 /* Setup color tables with gamma correction */
969 int i;
970 double g;
971
972 g = 1.0 / v->RedGamma;
973 for (i=0; i<256; i++) {
974 GLint red = IROUND_POS(255.0 * _mesa_pow( hpcr_rgbTbl[0][i]/255.0, g ));
975 v->hpcr_rgbTbl[0][i] = CLAMP( red, 16, 239 );
976 }
977
978 g = 1.0 / v->GreenGamma;
979 for (i=0; i<256; i++) {
980 GLint green = IROUND_POS(255.0 * _mesa_pow( hpcr_rgbTbl[1][i]/255.0, g ));
981 v->hpcr_rgbTbl[1][i] = CLAMP( green, 16, 239 );
982 }
983
984 g = 1.0 / v->BlueGamma;
985 for (i=0; i<256; i++) {
986 GLint blue = IROUND_POS(255.0 * _mesa_pow( hpcr_rgbTbl[2][i]/255.0, g ));
987 v->hpcr_rgbTbl[2][i] = CLAMP( blue, 32, 223 );
988 }
989 v->undithered_pf = PF_HPCR; /* can't really disable dithering for now */
990 v->dithered_pf = PF_HPCR;
991
992 /* which method should I use to clear */
993 /* GL_FALSE: keep the ordinary method */
994 /* GL_TRUE : clear with dither pattern */
995 v->hpcr_clear_flag = _mesa_getenv("MESA_HPCR_CLEAR") ? GL_TRUE : GL_FALSE;
996
997 if (v->hpcr_clear_flag) {
998 v->hpcr_clear_pixmap = XMesaCreatePixmap(v->display,
999 DefaultRootWindow(v->display),
1000 16, 2, 8);
1001 #ifndef XFree86Server
1002 v->hpcr_clear_ximage = XGetImage(v->display, v->hpcr_clear_pixmap,
1003 0, 0, 16, 2, AllPlanes, ZPixmap);
1004 #endif
1005 }
1006 }
1007
1008
1009 /*
1010 * Setup RGB rendering for a window with a True/DirectColor visual.
1011 */
1012 static void setup_truecolor( XMesaVisual v, XMesaBuffer buffer,
1013 XMesaColormap cmap )
1014 {
1015 unsigned long rmask, gmask, bmask;
1016 (void) buffer;
1017 (void) cmap;
1018
1019 /* Compute red multiplier (mask) and bit shift */
1020 v->rshift = 0;
1021 rmask = GET_REDMASK(v);
1022 while ((rmask & 1)==0) {
1023 v->rshift++;
1024 rmask = rmask >> 1;
1025 }
1026
1027 /* Compute green multiplier (mask) and bit shift */
1028 v->gshift = 0;
1029 gmask = GET_GREENMASK(v);
1030 while ((gmask & 1)==0) {
1031 v->gshift++;
1032 gmask = gmask >> 1;
1033 }
1034
1035 /* Compute blue multiplier (mask) and bit shift */
1036 v->bshift = 0;
1037 bmask = GET_BLUEMASK(v);
1038 while ((bmask & 1)==0) {
1039 v->bshift++;
1040 bmask = bmask >> 1;
1041 }
1042
1043 /*
1044 * Compute component-to-pixel lookup tables and dithering kernel
1045 */
1046 {
1047 static GLubyte kernel[16] = {
1048 0*16, 8*16, 2*16, 10*16,
1049 12*16, 4*16, 14*16, 6*16,
1050 3*16, 11*16, 1*16, 9*16,
1051 15*16, 7*16, 13*16, 5*16,
1052 };
1053 GLint rBits = bitcount(rmask);
1054 GLint gBits = bitcount(gmask);
1055 GLint bBits = bitcount(bmask);
1056 GLint maxBits;
1057 GLuint i;
1058
1059 /* convert pixel components in [0,_mask] to RGB values in [0,255] */
1060 for (i=0; i<=rmask; i++)
1061 v->PixelToR[i] = (unsigned char) ((i * 255) / rmask);
1062 for (i=0; i<=gmask; i++)
1063 v->PixelToG[i] = (unsigned char) ((i * 255) / gmask);
1064 for (i=0; i<=bmask; i++)
1065 v->PixelToB[i] = (unsigned char) ((i * 255) / bmask);
1066
1067 /* convert RGB values from [0,255] to pixel components */
1068
1069 for (i=0;i<256;i++) {
1070 GLint r = gamma_adjust(v->RedGamma, i, 255);
1071 GLint g = gamma_adjust(v->GreenGamma, i, 255);
1072 GLint b = gamma_adjust(v->BlueGamma, i, 255);
1073 v->RtoPixel[i] = (r >> (8-rBits)) << v->rshift;
1074 v->GtoPixel[i] = (g >> (8-gBits)) << v->gshift;
1075 v->BtoPixel[i] = (b >> (8-bBits)) << v->bshift;
1076 }
1077 /* overflow protection */
1078 for (i=256;i<512;i++) {
1079 v->RtoPixel[i] = v->RtoPixel[255];
1080 v->GtoPixel[i] = v->GtoPixel[255];
1081 v->BtoPixel[i] = v->BtoPixel[255];
1082 }
1083
1084 /* setup dithering kernel */
1085 maxBits = rBits;
1086 if (gBits > maxBits) maxBits = gBits;
1087 if (bBits > maxBits) maxBits = bBits;
1088 for (i=0;i<16;i++) {
1089 v->Kernel[i] = kernel[i] >> maxBits;
1090 }
1091
1092 v->undithered_pf = PF_Truecolor;
1093 v->dithered_pf = (GET_VISUAL_DEPTH(v)<24) ? PF_Dither_True : PF_Truecolor;
1094 }
1095
1096 /*
1097 * Now check for TrueColor visuals which we can optimize.
1098 */
1099 if ( GET_REDMASK(v) ==0x0000ff
1100 && GET_GREENMASK(v)==0x00ff00
1101 && GET_BLUEMASK(v) ==0xff0000
1102 && CHECK_BYTE_ORDER(v)
1103 && v->BitsPerPixel==32
1104 && sizeof(GLuint)==4
1105 && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
1106 /* common 32 bpp config used on SGI, Sun */
1107 v->undithered_pf = v->dithered_pf = PF_8A8B8G8R;
1108 }
1109 else if (GET_REDMASK(v) ==0xff0000
1110 && GET_GREENMASK(v)==0x00ff00
1111 && GET_BLUEMASK(v) ==0x0000ff
1112 && CHECK_BYTE_ORDER(v)
1113 && v->BitsPerPixel==32
1114 && sizeof(GLuint)==4
1115 && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
1116 /* common 32 bpp config used on Linux, HP, IBM */
1117 v->undithered_pf = v->dithered_pf = PF_8R8G8B;
1118 }
1119 else if (GET_REDMASK(v) ==0xff0000
1120 && GET_GREENMASK(v)==0x00ff00
1121 && GET_BLUEMASK(v) ==0x0000ff
1122 && CHECK_BYTE_ORDER(v)
1123 && v->BitsPerPixel==24
1124 && sizeof(GLuint)==4
1125 && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
1126 /* common packed 24 bpp config used on Linux */
1127 v->undithered_pf = v->dithered_pf = PF_8R8G8B24;
1128 }
1129 else if (GET_REDMASK(v) ==0xf800
1130 && GET_GREENMASK(v)==0x07e0
1131 && GET_BLUEMASK(v) ==0x001f
1132 && CHECK_BYTE_ORDER(v)
1133 && v->BitsPerPixel==16
1134 && sizeof(GLushort)==2
1135 && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
1136 /* 5-6-5 color weight on common PC VGA boards */
1137 v->undithered_pf = PF_5R6G5B;
1138 v->dithered_pf = PF_Dither_5R6G5B;
1139 }
1140 else if (GET_REDMASK(v) ==0xe0
1141 && GET_GREENMASK(v)==0x1c
1142 && GET_BLUEMASK(v) ==0x03
1143 && CHECK_FOR_HPCR(v)) {
1144 setup_8bit_hpcr( v );
1145 }
1146 }
1147
1148
1149
1150 /*
1151 * Setup RGB rendering for a window with a monochrome visual.
1152 */
1153 static void setup_monochrome( XMesaVisual v, XMesaBuffer b )
1154 {
1155 (void) b;
1156 v->dithered_pf = v->undithered_pf = PF_1Bit;
1157 /* if black=1 then we must flip pixel values */
1158 v->bitFlip = (GET_BLACK_PIXEL(v) != 0);
1159 }
1160
1161
1162
1163 /*
1164 * When a context is "made current" for the first time, we can finally
1165 * finish initializing the context's visual and buffer information.
1166 * Input: v - the XMesaVisual to initialize
1167 * b - the XMesaBuffer to initialize (may be NULL)
1168 * rgb_flag - TRUE = RGBA mode, FALSE = color index mode
1169 * window - the window/pixmap we're rendering into
1170 * cmap - the colormap associated with the window/pixmap
1171 * Return: GL_TRUE=success, GL_FALSE=failure
1172 */
1173 static GLboolean initialize_visual_and_buffer( int client,
1174 XMesaVisual v,
1175 XMesaBuffer b,
1176 GLboolean rgb_flag,
1177 XMesaDrawable window,
1178 XMesaColormap cmap )
1179 {
1180 #ifndef XFree86Server
1181 XGCValues gcvalues;
1182 #endif
1183
1184 if (b) {
1185 assert(b->xm_visual == v);
1186 }
1187
1188 /* Save true bits/pixel */
1189 v->BitsPerPixel = bits_per_pixel(v);
1190 assert(v->BitsPerPixel > 0);
1191
1192
1193 if (rgb_flag==GL_FALSE) {
1194 /* COLOR-INDEXED WINDOW:
1195 * Even if the visual is TrueColor or DirectColor we treat it as
1196 * being color indexed. This is weird but might be useful to someone.
1197 */
1198 v->dithered_pf = v->undithered_pf = PF_Index;
1199 v->index_bits = GET_VISUAL_DEPTH(v);
1200 }
1201 else {
1202 /* RGB WINDOW:
1203 * We support RGB rendering into almost any kind of visual.
1204 */
1205 int xclass;
1206 xclass = GET_VISUAL_CLASS(v);
1207 if (xclass==TrueColor || xclass==DirectColor) {
1208 setup_truecolor( v, b, cmap );
1209 }
1210 else if (xclass==StaticGray && GET_VISUAL_DEPTH(v)==1) {
1211 setup_monochrome( v, b );
1212 }
1213 else if (xclass==GrayScale || xclass==StaticGray) {
1214 if (!setup_grayscale( client, v, b, cmap )) {
1215 return GL_FALSE;
1216 }
1217 }
1218 else if ((xclass==PseudoColor || xclass==StaticColor)
1219 && GET_VISUAL_DEPTH(v)>=4 && GET_VISUAL_DEPTH(v)<=16) {
1220 if (!setup_dithered_color( client, v, b, cmap )) {
1221 return GL_FALSE;
1222 }
1223 }
1224 else {
1225 _mesa_warning(NULL, "XMesa: RGB mode rendering not supported in given visual.");
1226 return GL_FALSE;
1227 }
1228 v->index_bits = 0;
1229
1230 if (_mesa_getenv("MESA_NO_DITHER")) {
1231 v->dithered_pf = v->undithered_pf;
1232 }
1233 }
1234
1235
1236 /*
1237 * If MESA_INFO env var is set print out some debugging info
1238 * which can help Brian figure out what's going on when a user
1239 * reports bugs.
1240 */
1241 if (_mesa_getenv("MESA_INFO")) {
1242 _mesa_printf("X/Mesa visual = %p\n", (void *) v);
1243 _mesa_printf("X/Mesa dithered pf = %u\n", v->dithered_pf);
1244 _mesa_printf("X/Mesa undithered pf = %u\n", v->undithered_pf);
1245 _mesa_printf("X/Mesa level = %d\n", v->level);
1246 _mesa_printf("X/Mesa depth = %d\n", GET_VISUAL_DEPTH(v));
1247 _mesa_printf("X/Mesa bits per pixel = %d\n", v->BitsPerPixel);
1248 }
1249
1250 if (b && window) {
1251 /* Do window-specific initializations */
1252
1253 /* Window dimensions */
1254 unsigned int w, h;
1255 get_drawable_size( v->display, window, &w, &h );
1256 b->width = w;
1257 b->height = h;
1258
1259 b->frontbuffer = window;
1260
1261 /* Setup for single/double buffering */
1262 if (v->mesa_visual.doubleBufferMode) {
1263 /* Double buffered */
1264 #ifndef XFree86Server
1265 b->shm = check_for_xshm( v->display );
1266 #endif
1267 xmesa_alloc_back_buffer( b );
1268 if (b->db_state==BACK_PIXMAP) {
1269 b->buffer = (XMesaDrawable)b->backpixmap;
1270 }
1271 else {
1272 b->buffer = XIMAGE;
1273 }
1274 }
1275 else {
1276 /* Single Buffered */
1277 b->buffer = b->frontbuffer;
1278 }
1279
1280 /* X11 graphics contexts */
1281 #ifdef XFree86Server
1282 b->gc = CreateScratchGC(v->display, window->depth);
1283 #else
1284 b->gc = XCreateGC( v->display, window, 0, NULL );
1285 #endif
1286 XMesaSetFunction( v->display, b->gc, GXcopy );
1287
1288 /* cleargc - for glClear() */
1289 #ifdef XFree86Server
1290 b->cleargc = CreateScratchGC(v->display, window->depth);
1291 #else
1292 b->cleargc = XCreateGC( v->display, window, 0, NULL );
1293 #endif
1294 XMesaSetFunction( v->display, b->cleargc, GXcopy );
1295
1296 /*
1297 * Don't generate Graphics Expose/NoExpose events in swapbuffers().
1298 * Patch contributed by Michael Pichler May 15, 1995.
1299 */
1300 #ifdef XFree86Server
1301 b->swapgc = CreateScratchGC(v->display, window->depth);
1302 {
1303 CARD32 v[1];
1304 v[0] = FALSE;
1305 dixChangeGC(NullClient, b->swapgc, GCGraphicsExposures, v, NULL);
1306 }
1307 #else
1308 gcvalues.graphics_exposures = False;
1309 b->swapgc = XCreateGC( v->display, window,
1310 GCGraphicsExposures, &gcvalues);
1311 #endif
1312 XMesaSetFunction( v->display, b->swapgc, GXcopy );
1313 /*
1314 * Set fill style and tile pixmap once for all for HPCR stuff
1315 * (instead of doing it each time in clear_color_HPCR_pixmap())
1316 * Initialize whole stuff
1317 * Patch contributed by Jacques Leroy March 8, 1998.
1318 */
1319 if (v->hpcr_clear_flag && b->buffer!=XIMAGE) {
1320 int i;
1321 for (i=0; i<16; i++)
1322 {
1323 XMesaPutPixel(v->hpcr_clear_ximage, i, 0, 0);
1324 XMesaPutPixel(v->hpcr_clear_ximage, i, 1, 0);
1325 }
1326 XMesaPutImage(b->display, (XMesaDrawable)v->hpcr_clear_pixmap,
1327 b->cleargc, v->hpcr_clear_ximage, 0, 0, 0, 0, 16, 2);
1328 XMesaSetFillStyle( v->display, b->cleargc, FillTiled);
1329 XMesaSetTile( v->display, b->cleargc, v->hpcr_clear_pixmap );
1330 }
1331
1332 /* Initialize the row buffer XImage for use in write_color_span() */
1333 #ifdef XFree86Server
1334 b->rowimage = XMesaCreateImage(GET_VISUAL_DEPTH(v), MAX_WIDTH, 1,
1335 (char *)MALLOC(MAX_WIDTH*4));
1336 #else
1337 b->rowimage = XCreateImage( v->display,
1338 v->visinfo->visual,
1339 v->visinfo->depth,
1340 ZPixmap, 0, /*format, offset*/
1341 (char*) MALLOC(MAX_WIDTH*4), /*data*/
1342 MAX_WIDTH, 1, /*width, height*/
1343 32, /*bitmap_pad*/
1344 0 /*bytes_per_line*/ );
1345 #endif
1346 }
1347
1348 return GL_TRUE;
1349 }
1350
1351
1352
1353 /*
1354 * Convert an RGBA color to a pixel value.
1355 */
1356 unsigned long
1357 xmesa_color_to_pixel( XMesaContext xmesa, GLubyte r, GLubyte g, GLubyte b, GLubyte a,
1358 GLuint pixelFormat)
1359 {
1360 switch (pixelFormat) {
1361 case PF_Index:
1362 return 0;
1363 case PF_Truecolor:
1364 {
1365 unsigned long p;
1366 PACK_TRUECOLOR( p, r, g, b );
1367 return p;
1368 }
1369 case PF_8A8B8G8R:
1370 return PACK_8A8B8G8R( r, g, b, a );
1371 case PF_8R8G8B:
1372 /* fall through */
1373 case PF_8R8G8B24:
1374 return PACK_8R8G8B( r, g, b );
1375 case PF_5R6G5B:
1376 return PACK_5R6G5B( r, g, b );
1377 case PF_Dither:
1378 {
1379 DITHER_SETUP;
1380 return DITHER( 1, 0, r, g, b );
1381 }
1382 case PF_1Bit:
1383 /* 382 = (3*255)/2 */
1384 return ((r+g+b) > 382) ^ xmesa->xm_visual->bitFlip;
1385 case PF_HPCR:
1386 return DITHER_HPCR(1, 1, r, g, b);
1387 case PF_Lookup:
1388 {
1389 LOOKUP_SETUP;
1390 return LOOKUP( r, g, b );
1391 }
1392 case PF_Grayscale:
1393 return GRAY_RGB( r, g, b );
1394 case PF_Dither_True:
1395 /* fall through */
1396 case PF_Dither_5R6G5B:
1397 {
1398 unsigned long p;
1399 PACK_TRUEDITHER(p, 1, 0, r, g, b);
1400 return p;
1401 }
1402 default:
1403 _mesa_problem(NULL, "Bad pixel format in xmesa_color_to_pixel");
1404 }
1405 return 0;
1406 }
1407
1408
1409 /**********************************************************************/
1410 /***** Public Functions *****/
1411 /**********************************************************************/
1412
1413
1414 /*
1415 * Create a new X/Mesa visual.
1416 * Input: display - X11 display
1417 * visinfo - an XVisualInfo pointer
1418 * rgb_flag - GL_TRUE = RGB mode,
1419 * GL_FALSE = color index mode
1420 * alpha_flag - alpha buffer requested?
1421 * db_flag - GL_TRUE = double-buffered,
1422 * GL_FALSE = single buffered
1423 * stereo_flag - stereo visual?
1424 * ximage_flag - GL_TRUE = use an XImage for back buffer,
1425 * GL_FALSE = use an off-screen pixmap for back buffer
1426 * depth_size - requested bits/depth values, or zero
1427 * stencil_size - requested bits/stencil values, or zero
1428 * accum_red_size - requested bits/red accum values, or zero
1429 * accum_green_size - requested bits/green accum values, or zero
1430 * accum_blue_size - requested bits/blue accum values, or zero
1431 * accum_alpha_size - requested bits/alpha accum values, or zero
1432 * num_samples - number of samples/pixel if multisampling, or zero
1433 * level - visual level, usually 0
1434 * visualCaveat - ala the GLX extension, usually GLX_NONE_EXT
1435 * Return; a new XMesaVisual or 0 if error.
1436 */
1437 XMesaVisual XMesaCreateVisual( XMesaDisplay *display,
1438 XMesaVisualInfo visinfo,
1439 GLboolean rgb_flag,
1440 GLboolean alpha_flag,
1441 GLboolean db_flag,
1442 GLboolean stereo_flag,
1443 GLboolean ximage_flag,
1444 GLint depth_size,
1445 GLint stencil_size,
1446 GLint accum_red_size,
1447 GLint accum_green_size,
1448 GLint accum_blue_size,
1449 GLint accum_alpha_size,
1450 GLint num_samples,
1451 GLint level,
1452 GLint visualCaveat )
1453 {
1454 char *gamma;
1455 XMesaVisual v;
1456 GLint red_bits, green_bits, blue_bits, alpha_bits;
1457
1458 /* For debugging only */
1459 if (_mesa_getenv("MESA_XSYNC")) {
1460 /* This makes debugging X easier.
1461 * In your debugger, set a breakpoint on _XError to stop when an
1462 * X protocol error is generated.
1463 */
1464 #ifdef XFree86Server
1465 /* NOT_NEEDED */
1466 #else
1467 XSynchronize( display, 1 );
1468 #endif
1469 }
1470
1471 v = (XMesaVisual) CALLOC_STRUCT(xmesa_visual);
1472 if (!v) {
1473 return NULL;
1474 }
1475
1476 /*
1477 * In the X server, NULL is passed in for the display. It will have
1478 * to be set before using this visual. See XMesaSetVisualDisplay()
1479 * below.
1480 */
1481 v->display = display;
1482
1483 /* Save a copy of the XVisualInfo struct because the user may XFREE()
1484 * the struct but we may need some of the information contained in it
1485 * at a later time.
1486 */
1487 #ifdef XFree86Server
1488 v->visinfo = visinfo;
1489 #else
1490 v->visinfo = (XVisualInfo *) MALLOC(sizeof(*visinfo));
1491 if(!v->visinfo) {
1492 FREE(v);
1493 return NULL;
1494 }
1495 MEMCPY(v->visinfo, visinfo, sizeof(*visinfo));
1496 #endif
1497
1498 #ifdef XFree86Server
1499 /* Initialize the depth of the screen */
1500 {
1501 PixmapFormatRec *format;
1502
1503 for (format = screenInfo.formats;
1504 format->depth != display->rootDepth;
1505 format++)
1506 ;
1507 v->screen_depth = format->bitsPerPixel;
1508 }
1509 #endif
1510
1511 /* check for MESA_GAMMA environment variable */
1512 gamma = _mesa_getenv("MESA_GAMMA");
1513 if (gamma) {
1514 v->RedGamma = v->GreenGamma = v->BlueGamma = 0.0;
1515 sscanf( gamma, "%f %f %f", &v->RedGamma, &v->GreenGamma, &v->BlueGamma );
1516 if (v->RedGamma<=0.0) v->RedGamma = 1.0;
1517 if (v->GreenGamma<=0.0) v->GreenGamma = v->RedGamma;
1518 if (v->BlueGamma<=0.0) v->BlueGamma = v->RedGamma;
1519 }
1520 else {
1521 v->RedGamma = v->GreenGamma = v->BlueGamma = 1.0;
1522 }
1523
1524 v->ximage_flag = ximage_flag;
1525 v->level = level;
1526 v->VisualCaveat = visualCaveat;
1527
1528 (void) initialize_visual_and_buffer( 0, v, NULL, rgb_flag, 0, 0 );
1529
1530 {
1531 int xclass;
1532 xclass = GET_VISUAL_CLASS(v);
1533 if (xclass==TrueColor || xclass==DirectColor) {
1534 red_bits = bitcount(GET_REDMASK(v));
1535 green_bits = bitcount(GET_GREENMASK(v));
1536 blue_bits = bitcount(GET_BLUEMASK(v));
1537 alpha_bits = 0;
1538 }
1539 else {
1540 /* this is an approximation */
1541 int depth;
1542 depth = GET_VISUAL_DEPTH(v);
1543 red_bits = depth / 3;
1544 depth -= red_bits;
1545 green_bits = depth / 2;
1546 depth -= green_bits;
1547 blue_bits = depth;
1548 alpha_bits = 0;
1549 assert( red_bits + green_bits + blue_bits == GET_VISUAL_DEPTH(v) );
1550 }
1551 }
1552
1553 if (alpha_flag && alpha_bits == 0)
1554 alpha_bits = 8;
1555
1556 _mesa_initialize_visual( &v->mesa_visual,
1557 rgb_flag, db_flag, stereo_flag,
1558 red_bits, green_bits,
1559 blue_bits, alpha_bits,
1560 v->index_bits,
1561 depth_size,
1562 stencil_size,
1563 accum_red_size, accum_green_size,
1564 accum_blue_size, accum_alpha_size,
1565 0 );
1566 return v;
1567 }
1568
1569
1570 void XMesaSetVisualDisplay( XMesaDisplay *dpy, XMesaVisual v )
1571 {
1572 v->display = dpy;
1573 }
1574
1575
1576 void XMesaDestroyVisual( XMesaVisual v )
1577 {
1578 #ifndef XFree86Server
1579 FREE(v->visinfo);
1580 #endif
1581 FREE(v);
1582 }
1583
1584
1585
1586 /*
1587 * Create a new XMesaContext.
1588 * Input: v - XMesaVisual
1589 * share_list - another XMesaContext with which to share display
1590 * lists or NULL if no sharing is wanted.
1591 * Return: an XMesaContext or NULL if error.
1592 */
1593 XMesaContext XMesaCreateContext( XMesaVisual v, XMesaContext share_list )
1594 {
1595 static GLboolean firstTime = GL_TRUE;
1596 XMesaContext c;
1597 GLcontext *ctx;
1598 GLboolean direct = GL_TRUE; /* not really */
1599
1600 if (firstTime) {
1601 _glthread_INIT_MUTEX(_xmesa_lock);
1602 firstTime = GL_FALSE;
1603 }
1604
1605 c = (XMesaContext) CALLOC_STRUCT(xmesa_context);
1606 if (!c) {
1607 return NULL;
1608 }
1609
1610 ctx = c->gl_ctx = _mesa_create_context( &v->mesa_visual,
1611 share_list ? share_list->gl_ctx : (GLcontext *) NULL,
1612 (void *) c, direct);
1613 if (!c->gl_ctx) {
1614 FREE(c);
1615 return NULL;
1616 }
1617
1618 _mesa_enable_sw_extensions(ctx);
1619 _mesa_enable_1_3_extensions(ctx);
1620 _mesa_enable_1_4_extensions(ctx);
1621
1622 if (CHECK_BYTE_ORDER(v)) {
1623 c->swapbytes = GL_FALSE;
1624 }
1625 else {
1626 c->swapbytes = GL_TRUE;
1627 }
1628
1629 c->xm_visual = v;
1630 c->xm_draw_buffer = NULL; /* set later by XMesaMakeCurrent */
1631 c->xm_read_buffer = NULL; /* set later by XMesaMakeCurrent */
1632 c->xm_buffer = NULL; /* set later by XMesaMakeCurrent */
1633 c->display = v->display;
1634 c->pixelformat = v->dithered_pf; /* Dithering is enabled by default */
1635
1636 ctx->Driver.UpdateState = xmesa_update_state;
1637
1638 /* Initialize the software rasterizer and helper modules.
1639 */
1640 _swrast_CreateContext( ctx );
1641 _ac_CreateContext( ctx );
1642 _tnl_CreateContext( ctx );
1643 _swsetup_CreateContext( ctx );
1644
1645 xmesa_register_swrast_functions( ctx );
1646
1647 /* Set up some constant pointers:
1648 */
1649 xmesa_init_pointers( ctx );
1650
1651 return c;
1652 }
1653
1654
1655
1656
1657 void XMesaDestroyContext( XMesaContext c )
1658 {
1659 #ifdef FX
1660 if (c->xm_draw_buffer && c->xm_buffer->FXctx)
1661 fxMesaDestroyContext(c->xm_draw_buffer->FXctx);
1662 #endif
1663 if (c->gl_ctx) {
1664 _swsetup_DestroyContext( c->gl_ctx );
1665 _swrast_DestroyContext( c->gl_ctx );
1666 _tnl_DestroyContext( c->gl_ctx );
1667 _ac_DestroyContext( c->gl_ctx );
1668 _mesa_destroy_context( c->gl_ctx );
1669 }
1670
1671 FREE( c );
1672 }
1673
1674
1675
1676 /*
1677 * XXX this isn't a public function! It's a hack for the 3Dfx driver.
1678 * Create a new XMesaBuffer from an X window.
1679 * Input: v - the XMesaVisual
1680 * w - the window
1681 * c - the context
1682 * Return: new XMesaBuffer or NULL if error
1683 */
1684 XMesaBuffer XMesaCreateWindowBuffer2( XMesaVisual v, XMesaWindow w,
1685 XMesaContext c )
1686 {
1687 #ifndef XFree86Server
1688 XWindowAttributes attr;
1689 #endif
1690 #ifdef FX
1691 char *fxEnvVar;
1692 #endif
1693 int client = 0;
1694
1695 XMesaBuffer b = alloc_xmesa_buffer();
1696 if (!b) {
1697 return NULL;
1698 }
1699
1700 (void) c;
1701
1702 #ifdef XFree86Server
1703 client = CLIENT_ID(((XMesaDrawable)w)->id);
1704 #endif
1705
1706 assert(v);
1707
1708 #ifdef XFree86Server
1709 if (GET_VISUAL_DEPTH(v) != ((XMesaDrawable)w)->depth) {
1710 #else
1711 XGetWindowAttributes( v->display, w, &attr );
1712
1713 if (GET_VISUAL_DEPTH(v) != attr.depth) {
1714 #endif
1715 _mesa_warning(NULL, "XMesaCreateWindowBuffer: depth mismatch between visual and window!\n");
1716 return NULL;
1717 }
1718
1719 b->xm_visual = v;
1720 b->type = WINDOW;
1721 b->display = v->display;
1722 #ifdef XFree86Server
1723 b->cmap = (ColormapPtr)LookupIDByType(wColormap(w), RT_COLORMAP);
1724 #else
1725 if (attr.colormap) {
1726 b->cmap = attr.colormap;
1727 }
1728 else {
1729 _mesa_warning(NULL, "Window %u has no colormap!\n", (unsigned int) w);
1730 /* this is weird, a window w/out a colormap!? */
1731 /* OK, let's just allocate a new one and hope for the best */
1732 b->cmap = XCreateColormap(v->display, w, attr.visual, AllocNone);
1733 }
1734 #endif
1735
1736 /* determine back buffer implementation */
1737 if (v->mesa_visual.doubleBufferMode) {
1738 if (v->ximage_flag) {
1739 b->db_state = BACK_XIMAGE;
1740 }
1741 else {
1742 b->db_state = BACK_PIXMAP;
1743 }
1744 }
1745 else {
1746 b->db_state = 0;
1747 }
1748
1749 _mesa_initialize_framebuffer(&b->mesa_buffer,
1750 &v->mesa_visual,
1751 v->mesa_visual.depthBits > 0,
1752 v->mesa_visual.stencilBits > 0,
1753 v->mesa_visual.accumRedBits > 0,
1754 v->mesa_visual.alphaBits > 0 );
1755
1756 if (!initialize_visual_and_buffer( client, v, b, v->mesa_visual.rgbMode,
1757 (XMesaDrawable)w, b->cmap )) {
1758 free_xmesa_buffer(client, b);
1759 return NULL;
1760 }
1761
1762 #ifdef FX
1763 fxEnvVar = _mesa_getenv("MESA_GLX_FX");
1764 if (fxEnvVar) {
1765 if (fxEnvVar[0]!='d') {
1766 int attribs[100];
1767 int numAttribs = 0;
1768 int hw;
1769 if (v->mesa_visual.depthBits > 0) {
1770 attribs[numAttribs++] = FXMESA_DEPTH_SIZE;
1771 attribs[numAttribs++] = 1;
1772 }
1773 if (v->mesa_visual.doubleBufferMode) {
1774 attribs[numAttribs++] = FXMESA_DOUBLEBUFFER;
1775 }
1776 if (v->mesa_visual.accumRedBits > 0) {
1777 attribs[numAttribs++] = FXMESA_ACCUM_SIZE;
1778 attribs[numAttribs++] = v->mesa_visual.accumRedBits;
1779 }
1780 if (v->mesa_visual.stencilBits > 0) {
1781 attribs[numAttribs++] = FXMESA_STENCIL_SIZE;
1782 attribs[numAttribs++] = v->mesa_visual.stencilBits;
1783 }
1784 if (v->mesa_visual.alphaBits > 0) {
1785 attribs[numAttribs++] = FXMESA_ALPHA_SIZE;
1786 attribs[numAttribs++] = 1;
1787 }
1788 if (c->gl_ctx) {
1789 #define FXMESA_SHARE_CONTEXT 990099 /* keep in sync with fxapi.c! */
1790 attribs[numAttribs++] = FXMESA_SHARE_CONTEXT;
1791 attribs[numAttribs++] = (int) c->gl_ctx;
1792 }
1793 attribs[numAttribs++] = FXMESA_NONE;
1794
1795 if ((hw = fxQueryHardware())==GR_SSTTYPE_VOODOO) {
1796 b->FXctx = fxMesaCreateBestContext(0, b->width, b->height, attribs);
1797 if ((v->undithered_pf!=PF_Index) && (b->backimage)) {
1798 b->FXisHackUsable = b->FXctx ? GL_TRUE : GL_FALSE;
1799 if (fxEnvVar[0]=='w' || fxEnvVar[0]=='W')
1800 b->FXwindowHack = b->FXctx ? GL_TRUE : GL_FALSE;
1801 else
1802 b->FXwindowHack = GL_FALSE;
1803 }
1804 }
1805 else {
1806 if (fxEnvVar[0]=='w' || fxEnvVar[0]=='W')
1807 b->FXctx = fxMesaCreateContext(w, GR_RESOLUTION_NONE,
1808 GR_REFRESH_75Hz, attribs);
1809 else
1810 b->FXctx = fxMesaCreateBestContext(0, b->width, b->height, attribs);
1811 b->FXisHackUsable = GL_FALSE;
1812 b->FXwindowHack = GL_FALSE;
1813 }
1814 /*
1815 fprintf(stderr,
1816 "voodoo %d, wid %d height %d hack: usable %d active %d\n",
1817 hw, b->width, b->height, b->FXisHackUsable, b->FXwindowHack);
1818 */
1819 }
1820 }
1821 else {
1822 _mesa_warning(NULL, "WARNING: This Mesa Library includes the Glide driver but\n");
1823 _mesa_warning(NULL, " you have not defined the MESA_GLX_FX env. var.\n");
1824 _mesa_warning(NULL, " (check the README.3DFX file for more information).\n\n");
1825 _mesa_warning(NULL, " you can disable this message with a 'export MESA_GLX_FX=disable'.\n");
1826 }
1827 #endif
1828
1829 return b;
1830 }
1831
1832
1833 XMesaBuffer XMesaCreateWindowBuffer( XMesaVisual v, XMesaWindow w )
1834 {
1835 return XMesaCreateWindowBuffer2( v, w, NULL );
1836 }
1837
1838
1839 /*
1840 * Create a new XMesaBuffer from an X pixmap.
1841 * Input: v - the XMesaVisual
1842 * p - the pixmap
1843 * cmap - the colormap, may be 0 if using a TrueColor or DirectColor
1844 * visual for the pixmap
1845 * Return: new XMesaBuffer or NULL if error
1846 */
1847 XMesaBuffer XMesaCreatePixmapBuffer( XMesaVisual v,
1848 XMesaPixmap p, XMesaColormap cmap )
1849 {
1850 int client = 0;
1851 XMesaBuffer b = alloc_xmesa_buffer();
1852 if (!b) {
1853 return NULL;
1854 }
1855
1856
1857 #ifdef XFree86Server
1858 client = CLIENT_ID(((XMesaDrawable)p)->id);
1859 #endif
1860
1861 assert(v);
1862
1863 b->xm_visual = v;
1864 b->type = PIXMAP;
1865 b->display = v->display;
1866 b->cmap = cmap;
1867
1868 /* determine back buffer implementation */
1869 if (v->mesa_visual.doubleBufferMode) {
1870 if (v->ximage_flag) {
1871 b->db_state = BACK_XIMAGE;
1872 }
1873 else {
1874 b->db_state = BACK_PIXMAP;
1875 }
1876 }
1877 else {
1878 b->db_state = 0;
1879 }
1880
1881 _mesa_initialize_framebuffer(&b->mesa_buffer,
1882 &v->mesa_visual,
1883 v->mesa_visual.depthBits > 0,
1884 v->mesa_visual.stencilBits > 0,
1885 v->mesa_visual.accumRedBits +
1886 v->mesa_visual.accumGreenBits +
1887 v->mesa_visual.accumBlueBits > 0,
1888 v->mesa_visual.alphaBits > 0 );
1889
1890 if (!initialize_visual_and_buffer(client, v, b, v->mesa_visual.rgbMode,
1891 (XMesaDrawable)p, cmap)) {
1892 free_xmesa_buffer(client, b);
1893 return NULL;
1894 }
1895
1896 return b;
1897 }
1898
1899
1900
1901 XMesaBuffer XMesaCreatePBuffer( XMesaVisual v, XMesaColormap cmap,
1902 unsigned int width, unsigned int height )
1903 {
1904 #ifdef XFree86Server
1905 return 0;
1906 #else
1907 int client = 0;
1908 XMesaWindow root;
1909 XMesaDrawable drawable; /* X Pixmap Drawable */
1910 XMesaBuffer b = alloc_xmesa_buffer();
1911 if (!b) {
1912 return NULL;
1913 }
1914
1915 b->xm_visual = v;
1916 b->type = PBUFFER;
1917 b->display = v->display;
1918 b->cmap = cmap;
1919
1920 /* allocate pixmap for front buffer */
1921 root = RootWindow( v->display, v->visinfo->screen );
1922 drawable = XCreatePixmap( v->display, root, width, height, v->visinfo->depth );
1923
1924 /* determine back buffer implementation */
1925 if (v->mesa_visual.doubleBufferMode) {
1926 if (v->ximage_flag) {
1927 b->db_state = BACK_XIMAGE;
1928 }
1929 else {
1930 b->db_state = BACK_PIXMAP;
1931 }
1932 }
1933 else {
1934 b->db_state = 0;
1935 }
1936
1937 _mesa_initialize_framebuffer(&b->mesa_buffer,
1938 &v->mesa_visual,
1939 v->mesa_visual.depthBits > 0,
1940 v->mesa_visual.stencilBits > 0,
1941 v->mesa_visual.accumRedBits +
1942 v->mesa_visual.accumGreenBits +
1943 v->mesa_visual.accumBlueBits > 0,
1944 v->mesa_visual.alphaBits > 0 );
1945
1946 if (!initialize_visual_and_buffer(client, v, b, v->mesa_visual.rgbMode,
1947 drawable, cmap)) {
1948 free_xmesa_buffer(client, b);
1949 return NULL;
1950 }
1951
1952 return b;
1953 #endif
1954 }
1955
1956
1957
1958 /*
1959 * Deallocate an XMesaBuffer structure and all related info.
1960 */
1961 void XMesaDestroyBuffer( XMesaBuffer b )
1962 {
1963 int client = 0;
1964
1965 #ifdef XFree86Server
1966 if (b->frontbuffer)
1967 client = CLIENT_ID(b->frontbuffer->id);
1968 #endif
1969
1970 if (b->gc) XMesaFreeGC( b->xm_visual->display, b->gc );
1971 if (b->cleargc) XMesaFreeGC( b->xm_visual->display, b->cleargc );
1972 if (b->swapgc) XMesaFreeGC( b->xm_visual->display, b->swapgc );
1973
1974 if (b->backimage) {
1975 #if defined(USE_XSHM) && !defined(XFree86Server)
1976 if (b->shm) {
1977 XShmDetach( b->xm_visual->display, &b->shminfo );
1978 XDestroyImage( b->backimage );
1979 shmdt( b->shminfo.shmaddr );
1980 }
1981 else
1982 #endif
1983 XMesaDestroyImage( b->backimage );
1984 }
1985 if (b->backpixmap) {
1986 XMesaFreePixmap( b->xm_visual->display, b->backpixmap );
1987 if (b->xm_visual->hpcr_clear_flag) {
1988 XMesaFreePixmap( b->xm_visual->display,
1989 b->xm_visual->hpcr_clear_pixmap );
1990 XMesaDestroyImage( b->xm_visual->hpcr_clear_ximage );
1991 }
1992 }
1993 if (b->rowimage) {
1994 FREE( b->rowimage->data );
1995 b->rowimage->data = NULL;
1996 XMesaDestroyImage( b->rowimage );
1997 }
1998
1999 free_xmesa_buffer(client, b);
2000 }
2001
2002
2003
2004 /*
2005 * Bind buffer b to context c and make c the current rendering context.
2006 */
2007 GLboolean XMesaMakeCurrent( XMesaContext c, XMesaBuffer b )
2008 {
2009 return XMesaMakeCurrent2( c, b, b );
2010 }
2011
2012
2013 /*
2014 * Bind buffer b to context c and make c the current rendering context.
2015 */
2016 GLboolean XMesaMakeCurrent2( XMesaContext c, XMesaBuffer drawBuffer,
2017 XMesaBuffer readBuffer )
2018 {
2019 if (c) {
2020 if (!drawBuffer || !readBuffer)
2021 return GL_FALSE; /* must specify buffers! */
2022
2023 #ifdef FX
2024 if (drawBuffer->FXctx) {
2025 fxMesaMakeCurrent(drawBuffer->FXctx);
2026
2027 c->xm_draw_buffer = drawBuffer;
2028 c->xm_read_buffer = readBuffer;
2029 c->xm_buffer = drawBuffer;
2030
2031 return GL_TRUE;
2032 }
2033 #endif
2034 if (c->gl_ctx == _mesa_get_current_context()
2035 && c->xm_draw_buffer == drawBuffer
2036 && c->xm_read_buffer == readBuffer
2037 && c->xm_draw_buffer->wasCurrent) {
2038 /* same context and buffer, do nothing */
2039 return GL_TRUE;
2040 }
2041
2042 c->xm_draw_buffer = drawBuffer;
2043 c->xm_read_buffer = readBuffer;
2044 c->xm_buffer = drawBuffer;
2045
2046 _mesa_make_current2(c->gl_ctx,
2047 &drawBuffer->mesa_buffer,
2048 &readBuffer->mesa_buffer);
2049
2050 if (c->gl_ctx->Viewport.Width == 0) {
2051 /* initialize viewport to window size */
2052 _mesa_Viewport( 0, 0, drawBuffer->width, drawBuffer->height );
2053 c->gl_ctx->Scissor.Width = drawBuffer->width;
2054 c->gl_ctx->Scissor.Height = drawBuffer->height;
2055 }
2056
2057 if (c->xm_visual->mesa_visual.rgbMode) {
2058 /*
2059 * Must recompute and set these pixel values because colormap
2060 * can be different for different windows.
2061 */
2062 c->clearpixel = xmesa_color_to_pixel( c,
2063 c->clearcolor[0],
2064 c->clearcolor[1],
2065 c->clearcolor[2],
2066 c->clearcolor[3],
2067 c->xm_visual->undithered_pf);
2068 XMesaSetForeground(c->display, c->xm_draw_buffer->cleargc, c->clearpixel);
2069 }
2070
2071 /* Solution to Stephane Rehel's problem with glXReleaseBuffersMESA(): */
2072 c->xm_draw_buffer->wasCurrent = GL_TRUE;
2073 }
2074 else {
2075 /* Detach */
2076 _mesa_make_current2( NULL, NULL, NULL );
2077 }
2078 return GL_TRUE;
2079 }
2080
2081
2082 /*
2083 * Unbind the context c from its buffer.
2084 */
2085 GLboolean XMesaUnbindContext( XMesaContext c )
2086 {
2087 /* A no-op for XFree86 integration purposes */
2088 return GL_TRUE;
2089 }
2090
2091
2092 XMesaContext XMesaGetCurrentContext( void )
2093 {
2094 GET_CURRENT_CONTEXT(ctx);
2095 if (ctx) {
2096 XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
2097 return xmesa;
2098 }
2099 else {
2100 return 0;
2101 }
2102 }
2103
2104
2105 XMesaBuffer XMesaGetCurrentBuffer( void )
2106 {
2107 GET_CURRENT_CONTEXT(ctx);
2108 if (ctx) {
2109 XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
2110 return xmesa->xm_draw_buffer;
2111 }
2112 else {
2113 return 0;
2114 }
2115 }
2116
2117
2118 /* New in Mesa 3.1 */
2119 XMesaBuffer XMesaGetCurrentReadBuffer( void )
2120 {
2121 GET_CURRENT_CONTEXT(ctx);
2122 if (ctx) {
2123 XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
2124 return xmesa->xm_read_buffer;
2125 }
2126 else {
2127 return 0;
2128 }
2129 }
2130
2131
2132 GLboolean XMesaForceCurrent(XMesaContext c)
2133 {
2134 if (c) {
2135 if (c->gl_ctx != _mesa_get_current_context()) {
2136 _mesa_make_current(c->gl_ctx, &c->xm_draw_buffer->mesa_buffer);
2137 }
2138 }
2139 else {
2140 _mesa_make_current(NULL, NULL);
2141 }
2142 return GL_TRUE;
2143 }
2144
2145
2146 GLboolean XMesaLoseCurrent(XMesaContext c)
2147 {
2148 (void) c;
2149 _mesa_make_current(NULL, NULL);
2150 return GL_TRUE;
2151 }
2152
2153
2154 /*
2155 * Switch 3Dfx support hack between window and full-screen mode.
2156 */
2157 GLboolean XMesaSetFXmode( GLint mode )
2158 {
2159 #ifdef FX
2160 const char *fx = _mesa_getenv("MESA_GLX_FX");
2161 if (fx && fx[0] != 'd') {
2162 GET_CURRENT_CONTEXT(ctx);
2163 GrHwConfiguration hw;
2164 if (!FX_grSstQueryHardware(&hw)) {
2165 /*fprintf(stderr, "!grSstQueryHardware\n");*/
2166 return GL_FALSE;
2167 }
2168 if (hw.num_sst < 1) {
2169 /*fprintf(stderr, "hw.num_sst < 1\n");*/
2170 return GL_FALSE;
2171 }
2172 if (ctx) {
2173 XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
2174 if (mode == XMESA_FX_WINDOW) {
2175 if (xmesa->xm_draw_buffer->FXisHackUsable) {
2176 FX_grSstControl(GR_CONTROL_DEACTIVATE);
2177 xmesa->xm_draw_buffer->FXwindowHack = GL_TRUE;
2178 return GL_TRUE;
2179 }
2180 }
2181 else if (mode == XMESA_FX_FULLSCREEN) {
2182 FX_grSstControl(GR_CONTROL_ACTIVATE);
2183 xmesa->xm_draw_buffer->FXwindowHack = GL_FALSE;
2184 return GL_TRUE;
2185 }
2186 else {
2187 /* Error: Bad mode value */
2188 }
2189 }
2190 }
2191 /*fprintf(stderr, "fallthrough\n");*/
2192 #else
2193 (void) mode;
2194 #endif
2195 return GL_FALSE;
2196 }
2197
2198
2199
2200 #ifdef FX
2201 /*
2202 * Read image from VooDoo frame buffer into X/Mesa's back XImage.
2203 */
2204 static void FXgetImage( XMesaBuffer b )
2205 {
2206 GET_CURRENT_CONTEXT(ctx);
2207 static unsigned short pixbuf[MAX_WIDTH];
2208 GLuint x, y;
2209 int xpos, ypos;
2210 XMesaWindow root;
2211 unsigned int bw, depth, width, height;
2212 XMesaContext xmesa = (XMesaContext) ctx->DriverCtx;
2213
2214 #ifdef XFree86Server
2215 x = b->frontbuffer->x;
2216 y = b->frontbuffer->y;
2217 width = b->frontbuffer->width;
2218 height = b->frontbuffer->height;
2219 depth = b->frontbuffer->depth;
2220 #else
2221 XGetGeometry( b->xm_visual->display, b->frontbuffer,
2222 &root, &xpos, &ypos, &width, &height, &bw, &depth);
2223 #endif
2224 if (b->width != width || b->height != height) {
2225 b->width = MIN2((int)width, b->FXctx->width);
2226 b->height = MIN2((int)height, b->FXctx->height);
2227 if (b->width & 1)
2228 b->width--; /* prevent odd width */
2229 xmesa_alloc_back_buffer( b );
2230 }
2231
2232 grLfbWriteColorFormat(GR_COLORFORMAT_ARGB);
2233 if (b->xm_visual->undithered_pf==PF_5R6G5B) {
2234 /* Special case: 16bpp RGB */
2235 grLfbReadRegion( GR_BUFFER_FRONTBUFFER, /* src buffer */
2236 0, b->FXctx->height - b->height, /*pos*/
2237 b->width, b->height, /* size */
2238 b->width * sizeof(GLushort), /* stride */
2239 b->backimage->data); /* dest buffer */
2240 }
2241 else if (b->xm_visual->dithered_pf==PF_Dither
2242 && GET_VISUAL_DEPTH(b->xm_visual)==8) {
2243 /* Special case: 8bpp RGB */
2244 for (y=0;y<b->height;y++) {
2245 GLubyte *ptr = (GLubyte*) b->backimage->data
2246 + b->backimage->bytes_per_line * y;
2247 XDITHER_SETUP(y);
2248
2249 /* read row from 3Dfx frame buffer */
2250 grLfbReadRegion( GR_BUFFER_FRONTBUFFER,
2251 0, b->FXctx->height-(b->height-y),
2252 b->width, 1,
2253 0,
2254 pixbuf );
2255
2256 /* write to XImage back buffer */
2257 for (x=0;x<b->width;x++) {
2258 GLubyte r = (pixbuf[x] & 0xf800) >> 8;
2259 GLubyte g = (pixbuf[x] & 0x07e0) >> 3;
2260 GLubyte b = (pixbuf[x] & 0x001f) << 3;
2261 *ptr++ = XDITHER( x, r, g, b);
2262 }
2263 }
2264 }
2265 else {
2266 /* General case: slow! */
2267 for (y=0;y<b->height;y++) {
2268 /* read row from 3Dfx frame buffer */
2269 grLfbReadRegion( GR_BUFFER_FRONTBUFFER,
2270 0, b->FXctx->height-(b->height-y),
2271 b->width, 1,
2272 0,
2273 pixbuf );
2274
2275 /* write to XImage back buffer */
2276 for (x=0;x<b->width;x++) {
2277 XMesaPutPixel(b->backimage,x,y,
2278 xmesa_color_to_pixel(xmesa,
2279 (pixbuf[x] & 0xf800) >> 8,
2280 (pixbuf[x] & 0x07e0) >> 3,
2281 (pixbuf[x] & 0x001f) << 3,
2282 0xff,
2283 b->xm_visual->undithered_pf));
2284 }
2285 }
2286 }
2287 grLfbWriteColorFormat(GR_COLORFORMAT_ABGR);
2288 }
2289 #endif
2290
2291
2292 /*
2293 * Copy the back buffer to the front buffer. If there's no back buffer
2294 * this is a no-op.
2295 */
2296 void XMesaSwapBuffers( XMesaBuffer b )
2297 {
2298 GET_CURRENT_CONTEXT(ctx);
2299
2300 /* If we're swapping the buffer associated with the current context
2301 * we have to flush any pending rendering commands first.
2302 */
2303 if (ctx && ctx->DrawBuffer == &(b->mesa_buffer))
2304 _mesa_notifySwapBuffers(ctx);
2305
2306 if (b->db_state) {
2307 #ifdef FX
2308 if (b->FXctx) {
2309 fxMesaSwapBuffers();
2310
2311 if (b->FXwindowHack)
2312 FXgetImage(b);
2313 else
2314 return;
2315 }
2316 #endif
2317 if (b->backimage) {
2318 /* Copy Ximage from host's memory to server's window */
2319 #if defined(USE_XSHM) && !defined(XFree86Server)
2320 if (b->shm) {
2321 /*_glthread_LOCK_MUTEX(_xmesa_lock);*/
2322 XShmPutImage( b->xm_visual->display, b->frontbuffer,
2323 b->swapgc,
2324 b->backimage, 0, 0,
2325 0, 0, b->width, b->height, False );
2326 /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/
2327 }
2328 else
2329 #endif
2330 {
2331 /*_glthread_LOCK_MUTEX(_xmesa_lock);*/
2332 XMesaPutImage( b->xm_visual->display, b->frontbuffer,
2333 b->swapgc,
2334 b->backimage, 0, 0,
2335 0, 0, b->width, b->height );
2336 /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/
2337 }
2338 }
2339 else {
2340 /* Copy pixmap to window on server */
2341 /*_glthread_LOCK_MUTEX(_xmesa_lock);*/
2342 XMesaCopyArea( b->xm_visual->display,
2343 b->backpixmap, /* source drawable */
2344 b->frontbuffer, /* dest. drawable */
2345 b->swapgc,
2346 0, 0, b->width, b->height, /* source region */
2347 0, 0 /* dest region */
2348 );
2349 /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/
2350 }
2351 }
2352 #if !defined(XFree86Server)
2353 XSync( b->xm_visual->display, False );
2354 #endif
2355 }
2356
2357
2358
2359 /*
2360 * Copy sub-region of back buffer to front buffer
2361 */
2362 void XMesaCopySubBuffer( XMesaBuffer b, int x, int y, int width, int height )
2363 {
2364 GET_CURRENT_CONTEXT(ctx);
2365
2366 /* If we're swapping the buffer associated with the current context
2367 * we have to flush any pending rendering commands first.
2368 */
2369 if (ctx && ctx->DrawBuffer == &(b->mesa_buffer))
2370 _mesa_notifySwapBuffers(ctx);
2371
2372 if (b->db_state) {
2373 int yTop = b->height - y - height;
2374 #ifdef FX
2375 if (b->FXctx) {
2376 fxMesaSwapBuffers();
2377 if (b->FXwindowHack)
2378 FXgetImage(b);
2379 else
2380 return;
2381 }
2382 #endif
2383 if (b->backimage) {
2384 /* Copy Ximage from host's memory to server's window */
2385 #if defined(USE_XSHM) && !defined(XFree86Server)
2386 if (b->shm) {
2387 /* XXX assuming width and height aren't too large! */
2388 XShmPutImage( b->xm_visual->display, b->frontbuffer,
2389 b->swapgc,
2390 b->backimage, x, yTop,
2391 x, yTop, width, height, False );
2392 /* wait for finished event??? */
2393 }
2394 else
2395 #endif
2396 {
2397 /* XXX assuming width and height aren't too large! */
2398 XMesaPutImage( b->xm_visual->display, b->frontbuffer,
2399 b->swapgc,
2400 b->backimage, x, yTop,
2401 x, yTop, width, height );
2402 }
2403 }
2404 else {
2405 /* Copy pixmap to window on server */
2406 XMesaCopyArea( b->xm_visual->display,
2407 b->backpixmap, /* source drawable */
2408 b->frontbuffer, /* dest. drawable */
2409 b->swapgc,
2410 x, yTop, width, height, /* source region */
2411 x, yTop /* dest region */
2412 );
2413 }
2414 }
2415 }
2416
2417
2418 /*
2419 * Return a pointer to the XMesa backbuffer Pixmap or XImage. This function
2420 * is a way to get "under the hood" of X/Mesa so one can manipulate the
2421 * back buffer directly.
2422 * Output: pixmap - pointer to back buffer's Pixmap, or 0
2423 * ximage - pointer to back buffer's XImage, or NULL
2424 * Return: GL_TRUE = context is double buffered
2425 * GL_FALSE = context is single buffered
2426 */
2427 GLboolean XMesaGetBackBuffer( XMesaBuffer b,
2428 XMesaPixmap *pixmap,
2429 XMesaImage **ximage )
2430 {
2431 if (b->db_state) {
2432 if (pixmap) *pixmap = b->backpixmap;
2433 if (ximage) *ximage = b->backimage;
2434 return GL_TRUE;
2435 }
2436 else {
2437 *pixmap = 0;
2438 *ximage = NULL;
2439 return GL_FALSE;
2440 }
2441 }
2442
2443
2444 /*
2445 * Return the depth buffer associated with an XMesaBuffer.
2446 * Input: b - the XMesa buffer handle
2447 * Output: width, height - size of buffer in pixels
2448 * bytesPerValue - bytes per depth value (2 or 4)
2449 * buffer - pointer to depth buffer values
2450 * Return: GL_TRUE or GL_FALSE to indicate success or failure.
2451 */
2452 GLboolean XMesaGetDepthBuffer( XMesaBuffer b, GLint *width, GLint *height,
2453 GLint *bytesPerValue, void **buffer )
2454 {
2455 if (!b->mesa_buffer.DepthBuffer) {
2456 *width = 0;
2457 *height = 0;
2458 *bytesPerValue = 0;
2459 *buffer = 0;
2460 return GL_FALSE;
2461 }
2462 else {
2463 *width = b->mesa_buffer.Width;
2464 *height = b->mesa_buffer.Height;
2465 *bytesPerValue = sizeof(GLdepth);
2466 *buffer = b->mesa_buffer.DepthBuffer;
2467 return GL_TRUE;
2468 }
2469 }
2470
2471
2472 void XMesaFlush( XMesaContext c )
2473 {
2474 if (c && c->xm_visual) {
2475 #ifdef XFree86Server
2476 /* NOT_NEEDED */
2477 #else
2478 XSync( c->xm_visual->display, False );
2479 #endif
2480 }
2481 }
2482
2483
2484
2485 const char *XMesaGetString( XMesaContext c, int name )
2486 {
2487 (void) c;
2488 if (name==XMESA_VERSION) {
2489 return "5.0";
2490 }
2491 else if (name==XMESA_EXTENSIONS) {
2492 return "";
2493 }
2494 else {
2495 return NULL;
2496 }
2497 }
2498
2499
2500
2501 XMesaBuffer XMesaFindBuffer( XMesaDisplay *dpy, XMesaDrawable d )
2502 {
2503 XMesaBuffer b;
2504 for (b=XMesaBufferList; b; b=b->Next) {
2505 if (b->frontbuffer==d && b->display==dpy) {
2506 return b;
2507 }
2508 }
2509 return NULL;
2510 }
2511
2512
2513
2514 /*
2515 * Look for XMesaBuffers whose X window has been destroyed.
2516 * Deallocate any such XMesaBuffers.
2517 */
2518 void XMesaGarbageCollect( void )
2519 {
2520 XMesaBuffer b, next;
2521 for (b=XMesaBufferList; b; b=next) {
2522 next = b->Next;
2523 if (b->display && b->frontbuffer && b->type == WINDOW) {
2524 #ifdef XFree86Server
2525 /* NOT_NEEDED */
2526 #else
2527 XSync(b->display, False);
2528 if (!window_exists( b->display, b->frontbuffer )) {
2529 /* found a dead window, free the ancillary info */
2530 XMesaDestroyBuffer( b );
2531 }
2532 #endif
2533 }
2534 }
2535 }
2536
2537
2538 void XMesaReset( void )
2539 {
2540 while (XMesaBufferList)
2541 XMesaDestroyBuffer(XMesaBufferList);
2542
2543 XMesaBufferList = NULL;
2544 }
2545
2546
2547 unsigned long XMesaDitherColor( XMesaContext xmesa, GLint x, GLint y,
2548 GLfloat red, GLfloat green,
2549 GLfloat blue, GLfloat alpha )
2550 {
2551 GLint r = (GLint) (red * 255.0F);
2552 GLint g = (GLint) (green * 255.0F);
2553 GLint b = (GLint) (blue * 255.0F);
2554 GLint a = (GLint) (alpha * 255.0F);
2555
2556 switch (xmesa->pixelformat) {
2557 case PF_Index:
2558 return 0;
2559 case PF_Truecolor:
2560 {
2561 unsigned long p;
2562 PACK_TRUECOLOR( p, r, g, b );
2563 return p;
2564 }
2565 case PF_8A8B8G8R:
2566 return PACK_8A8B8G8R( r, g, b, a );
2567 case PF_8R8G8B:
2568 return PACK_8R8G8B( r, g, b );
2569 case PF_5R6G5B:
2570 return PACK_5R6G5B( r, g, b );
2571 case PF_Dither:
2572 {
2573 DITHER_SETUP;
2574 return DITHER( x, y, r, g, b );
2575 }
2576 case PF_1Bit:
2577 /* 382 = (3*255)/2 */
2578 return ((r+g+b) > 382) ^ xmesa->xm_visual->bitFlip;
2579 case PF_HPCR:
2580 return DITHER_HPCR(x, y, r, g, b);
2581 case PF_Lookup:
2582 {
2583 LOOKUP_SETUP;
2584 return LOOKUP( r, g, b );
2585 }
2586 case PF_Grayscale:
2587 return GRAY_RGB( r, g, b );
2588 case PF_Dither_5R6G5B:
2589 /* fall through */
2590 case PF_Dither_True:
2591 {
2592 unsigned long p;
2593 PACK_TRUEDITHER(p, x, y, r, g, b);
2594 return p;
2595 }
2596 default:
2597 _mesa_problem(NULL, "Bad pixel format in XMesaDitherColor");
2598 }
2599 return 0;
2600 }
2601
2602
2603 /*
2604 * This is typically called when the window size changes and we need
2605 * to reallocate the buffer's back/depth/stencil/accum buffers.
2606 */
2607 void XMesaResizeBuffers( XMesaBuffer b )
2608 {
2609 xmesa_resize_buffers( &(b->mesa_buffer) );
2610
2611 }
2612