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GL_ARB_vertex_buffer_object working now, at least for non-indexed
[mesa.git] / src / mesa / drivers / x11 / xm_api.c
1 /*
2 * Mesa 3-D graphics library
3 * Version: 5.1
4 *
5 * Copyright (C) 1999-2003 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 /* $XFree86: xc/extras/Mesa/src/X/xm_api.c,v 1.2 2002/02/26 23:37:31 tsi Exp $ */
25
26 /*
27 * This file contains the implementations of all the XMesa* functions.
28 *
29 *
30 * NOTES:
31 *
32 * The window coordinate system origin (0,0) is in the lower-left corner
33 * of the window. X11's window coordinate origin is in the upper-left
34 * corner of the window. Therefore, most drawing functions in this
35 * file have to flip Y coordinates.
36 *
37 * Define USE_XSHM in the Makefile with -DUSE_XSHM if you want to compile
38 * in support for the MIT Shared Memory extension. If enabled, when you
39 * use an Ximage for the back buffer in double buffered mode, the "swap"
40 * operation will be faster. You must also link with -lXext.
41 *
42 * Byte swapping: If the Mesa host and the X display use a different
43 * byte order then there's some trickiness to be aware of when using
44 * XImages. The byte ordering used for the XImage is that of the X
45 * display, not the Mesa host.
46 * The color-to-pixel encoding for True/DirectColor must be done
47 * according to the display's visual red_mask, green_mask, and blue_mask.
48 * If XPutPixel is used to put a pixel into an XImage then XPutPixel will
49 * do byte swapping if needed. If one wants to directly "poke" the pixel
50 * into the XImage's buffer then the pixel must be byte swapped first. In
51 * Mesa, when byte swapping is needed we use the PF_TRUECOLOR pixel format
52 * and use XPutPixel everywhere except in the implementation of
53 * glClear(GL_COLOR_BUFFER_BIT). We want this function to be fast so
54 * instead of using XPutPixel we "poke" our values after byte-swapping
55 * the clear pixel value if needed.
56 *
57 */
58
59 #ifdef __CYGWIN__
60 #undef WIN32
61 #undef __WIN32__
62 #endif
63
64 #include "glxheader.h"
65 #include "GL/xmesa.h"
66 #include "xmesaP.h"
67 #include "context.h"
68 #include "extensions.h"
69 #include "glthread.h"
70 #include "imports.h"
71 #include "matrix.h"
72 #include "mtypes.h"
73 #include "macros.h"
74 #include "texformat.h"
75 #include "texobj.h"
76 #include "texstore.h"
77 #include "swrast/swrast.h"
78 #include "swrast_setup/swrast_setup.h"
79 #include "array_cache/acache.h"
80 #include "tnl/tnl.h"
81
82 #ifndef GLX_NONE_EXT
83 #define GLX_NONE_EXT 0x8000
84 #endif
85
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 * Error handling.
176 */
177 #ifndef XFree86Server
178 static int mesaXErrorFlag = 0;
179
180 static int mesaHandleXError( XMesaDisplay *dpy, XErrorEvent *event )
181 {
182 (void) dpy;
183 (void) event;
184 mesaXErrorFlag = 1;
185 return 0;
186 }
187 #endif
188
189
190 /*
191 * Check if the X Shared Memory extension is available.
192 * Return: 0 = not available
193 * 1 = shared XImage support available
194 * 2 = shared Pixmap support available also
195 */
196 #ifndef XFree86Server
197 static int check_for_xshm( XMesaDisplay *display )
198 {
199 #ifdef USE_XSHM
200 int major, minor, ignore;
201 Bool pixmaps;
202
203 if (XQueryExtension( display, "MIT-SHM", &ignore, &ignore, &ignore )) {
204 if (XShmQueryVersion( display, &major, &minor, &pixmaps )==True) {
205 return (pixmaps==True) ? 2 : 1;
206 }
207 else {
208 return 0;
209 }
210 }
211 else {
212 return 0;
213 }
214 #else
215 /* Can't compile XSHM support */
216 return 0;
217 #endif
218 }
219 #endif
220
221
222 /*
223 * Return the width and height of the given drawable.
224 */
225 static void get_drawable_size( XMesaDisplay *dpy, XMesaDrawable d,
226 unsigned int *width, unsigned int *height)
227 {
228 #ifdef XFree86Server
229 (void) dpy;
230 *width = d->width;
231 *height = d->height;
232 #else
233 Window root;
234 int x, y;
235 unsigned int bw, depth;
236
237 _glthread_LOCK_MUTEX(_xmesa_lock);
238 XGetGeometry( dpy, d, &root, &x, &y, width, height, &bw, &depth );
239 _glthread_UNLOCK_MUTEX(_xmesa_lock);
240 #endif
241 }
242
243
244 /*
245 * Apply gamma correction to an intensity value in [0..max]. Return the
246 * new intensity value.
247 */
248 static GLint gamma_adjust( GLfloat gamma, GLint value, GLint max )
249 {
250 if (gamma == 1.0) {
251 return value;
252 }
253 else {
254 double x = (double) value / (double) max;
255 return IROUND_POS((GLfloat) max * _mesa_pow(x, 1.0F/gamma));
256 }
257 }
258
259
260
261 /*
262 * Return the true number of bits per pixel for XImages.
263 * For example, if we request a 24-bit deep visual we may actually need/get
264 * 32bpp XImages. This function returns the appropriate bpp.
265 * Input: dpy - the X display
266 * visinfo - desribes the visual to be used for XImages
267 * Return: true number of bits per pixel for XImages
268 */
269 #ifdef XFree86Server
270
271 static int bits_per_pixel( XMesaVisual xmv )
272 {
273 XMesaVisualInfo visinfo = xmv->visinfo;
274 const int depth = visinfo->nplanes;
275 int i;
276 for (i = 0; i < screenInfo.numPixmapFormats; i++) {
277 if (screenInfo.formats[i].depth == depth)
278 return screenInfo.formats[i].bitsPerPixel;
279 }
280 return depth; /* should never get here, but this should be safe */
281 }
282
283 #else
284
285 static int bits_per_pixel( XMesaVisual xmv )
286 {
287 XMesaDisplay *dpy = xmv->display;
288 XMesaVisualInfo visinfo = xmv->visinfo;
289 XMesaImage *img;
290 int bitsPerPixel;
291 /* Create a temporary XImage */
292 img = XCreateImage( dpy, visinfo->visual, visinfo->depth,
293 ZPixmap, 0, /*format, offset*/
294 (char*) MALLOC(8), /*data*/
295 1, 1, /*width, height*/
296 32, /*bitmap_pad*/
297 0 /*bytes_per_line*/
298 );
299 assert(img);
300 /* grab the bits/pixel value */
301 bitsPerPixel = img->bits_per_pixel;
302 /* free the XImage */
303 FREE( img->data );
304 img->data = NULL;
305 XMesaDestroyImage( img );
306 return bitsPerPixel;
307 }
308 #endif
309
310
311
312 /*
313 * Determine if a given X window ID is valid (window exists).
314 * Do this by calling XGetWindowAttributes() for the window and
315 * checking if we catch an X error.
316 * Input: dpy - the display
317 * win - the window to check for existance
318 * Return: GL_TRUE - window exists
319 * GL_FALSE - window doesn't exist
320 */
321 #ifndef XFree86Server
322 static GLboolean WindowExistsFlag;
323
324 static int window_exists_err_handler( XMesaDisplay* dpy, XErrorEvent* xerr )
325 {
326 (void) dpy;
327 if (xerr->error_code == BadWindow) {
328 WindowExistsFlag = GL_FALSE;
329 }
330 return 0;
331 }
332
333 static GLboolean window_exists( XMesaDisplay *dpy, Window win )
334 {
335 XWindowAttributes wa;
336 int (*old_handler)( XMesaDisplay*, XErrorEvent* );
337 WindowExistsFlag = GL_TRUE;
338 old_handler = XSetErrorHandler(window_exists_err_handler);
339 XGetWindowAttributes( dpy, win, &wa ); /* dummy request */
340 XSetErrorHandler(old_handler);
341 return WindowExistsFlag;
342 }
343 #endif
344
345
346
347 /**********************************************************************/
348 /***** Linked list of XMesaBuffers *****/
349 /**********************************************************************/
350
351 static XMesaBuffer XMesaBufferList = NULL;
352
353
354 /* Allocate a new XMesaBuffer, add to linked list */
355 static XMesaBuffer alloc_xmesa_buffer(void)
356 {
357 XMesaBuffer b = (XMesaBuffer) CALLOC_STRUCT(xmesa_buffer);
358 if (b) {
359 b->Next = XMesaBufferList;
360 XMesaBufferList = b;
361 }
362 return b;
363 }
364
365
366 /*
367 * Find an XMesaBuffer by matching X display and colormap but NOT matching
368 * the notThis buffer.
369 */
370 static XMesaBuffer find_xmesa_buffer(XMesaDisplay *dpy,
371 XMesaColormap cmap,
372 XMesaBuffer notThis)
373 {
374 XMesaBuffer b;
375 for (b=XMesaBufferList; b; b=b->Next) {
376 if (b->display==dpy && b->cmap==cmap && b!=notThis) {
377 return b;
378 }
379 }
380 return NULL;
381 }
382
383
384 /*
385 * Free an XMesaBuffer, remove from linked list, perhaps free X colormap
386 * entries.
387 */
388 static void free_xmesa_buffer(int client, XMesaBuffer buffer)
389 {
390 XMesaBuffer prev = NULL, b;
391 (void) client;
392 for (b=XMesaBufferList; b; b=b->Next) {
393 if (b==buffer) {
394 /* unlink bufer from list */
395 if (prev)
396 prev->Next = buffer->Next;
397 else
398 XMesaBufferList = buffer->Next;
399 /* Check to free X colors */
400 if (buffer->num_alloced>0) {
401 /* If no other buffer uses this X colormap then free the colors. */
402 if (!find_xmesa_buffer(buffer->display, buffer->cmap, buffer)) {
403 #ifdef XFree86Server
404 (void)FreeColors(buffer->cmap, client,
405 buffer->num_alloced, buffer->alloced_colors,
406 0);
407 #else
408 XFreeColors(buffer->display, buffer->cmap,
409 buffer->alloced_colors, buffer->num_alloced, 0);
410 #endif
411 }
412 }
413
414 _mesa_free_framebuffer_data(&buffer->mesa_buffer);
415 FREE(buffer);
416
417 return;
418 }
419 /* continue search */
420 prev = b;
421 }
422 /* buffer not found in XMesaBufferList */
423 _mesa_problem(NULL,"free_xmesa_buffer() - buffer not found\n");
424 }
425
426
427 /* Copy X color table stuff from one XMesaBuffer to another. */
428 static void copy_colortable_info(XMesaBuffer dst, const XMesaBuffer src)
429 {
430 MEMCPY(dst->color_table, src->color_table, sizeof(src->color_table));
431 MEMCPY(dst->pixel_to_r, src->pixel_to_r, sizeof(src->pixel_to_r));
432 MEMCPY(dst->pixel_to_g, src->pixel_to_g, sizeof(src->pixel_to_g));
433 MEMCPY(dst->pixel_to_b, src->pixel_to_b, sizeof(src->pixel_to_b));
434 dst->num_alloced = src->num_alloced;
435 MEMCPY(dst->alloced_colors, src->alloced_colors,
436 sizeof(src->alloced_colors));
437 }
438
439
440
441 /**********************************************************************/
442 /***** Misc Private Functions *****/
443 /**********************************************************************/
444
445
446 /*
447 * Return number of bits set in n.
448 */
449 static int bitcount( unsigned long n )
450 {
451 int bits;
452 for (bits=0; n>0; n=n>>1) {
453 if (n&1) {
454 bits++;
455 }
456 }
457 return bits;
458 }
459
460
461
462 /*
463 * Allocate a shared memory XImage back buffer for the given XMesaBuffer.
464 * Return: GL_TRUE if success, GL_FALSE if error
465 */
466 #ifndef XFree86Server
467 static GLboolean alloc_shm_back_buffer( XMesaBuffer b )
468 {
469 #ifdef USE_XSHM
470 /*
471 * We have to do a _lot_ of error checking here to be sure we can
472 * really use the XSHM extension. It seems different servers trigger
473 * errors at different points if the extension won't work. Therefore
474 * we have to be very careful...
475 */
476 GC gc;
477 int (*old_handler)( XMesaDisplay *, XErrorEvent * );
478
479 b->backimage = XShmCreateImage( b->xm_visual->display,
480 b->xm_visual->visinfo->visual,
481 b->xm_visual->visinfo->depth,
482 ZPixmap, NULL, &b->shminfo,
483 b->width, b->height );
484 if (b->backimage == NULL) {
485 _mesa_warning(NULL, "alloc_back_buffer: Shared memory error (XShmCreateImage), disabling.");
486 b->shm = 0;
487 return GL_FALSE;
488 }
489
490 b->shminfo.shmid = shmget( IPC_PRIVATE, b->backimage->bytes_per_line
491 * b->backimage->height, IPC_CREAT|0777 );
492 if (b->shminfo.shmid < 0) {
493 _mesa_warning(NULL, "shmget failed while allocating back buffer");
494 XDestroyImage( b->backimage );
495 b->backimage = NULL;
496 _mesa_warning(NULL, "alloc_back_buffer: Shared memory error (shmget), disabling.");
497 b->shm = 0;
498 return GL_FALSE;
499 }
500
501 b->shminfo.shmaddr = b->backimage->data
502 = (char*)shmat( b->shminfo.shmid, 0, 0 );
503 if (b->shminfo.shmaddr == (char *) -1) {
504 _mesa_warning(NULL, "shmat() failed while allocating back buffer");
505 XDestroyImage( b->backimage );
506 shmctl( b->shminfo.shmid, IPC_RMID, 0 );
507 b->backimage = NULL;
508 _mesa_warning(NULL, "alloc_back_buffer: Shared memory error (shmat), disabling.");
509 b->shm = 0;
510 return GL_FALSE;
511 }
512
513 b->shminfo.readOnly = False;
514 mesaXErrorFlag = 0;
515 old_handler = XSetErrorHandler( mesaHandleXError );
516 /* This may trigger the X protocol error we're ready to catch: */
517 XShmAttach( b->xm_visual->display, &b->shminfo );
518 XSync( b->xm_visual->display, False );
519
520 if (mesaXErrorFlag) {
521 /* we are on a remote display, this error is normal, don't print it */
522 XFlush( b->xm_visual->display );
523 mesaXErrorFlag = 0;
524 XDestroyImage( b->backimage );
525 shmdt( b->shminfo.shmaddr );
526 shmctl( b->shminfo.shmid, IPC_RMID, 0 );
527 b->backimage = NULL;
528 b->shm = 0;
529 (void) XSetErrorHandler( old_handler );
530 return GL_FALSE;
531 }
532
533 shmctl( b->shminfo.shmid, IPC_RMID, 0 ); /* nobody else needs it */
534
535 /* Finally, try an XShmPutImage to be really sure the extension works */
536 gc = XCreateGC( b->xm_visual->display, b->frontbuffer, 0, NULL );
537 XShmPutImage( b->xm_visual->display, b->frontbuffer, gc,
538 b->backimage, 0, 0, 0, 0, 1, 1 /*one pixel*/, False );
539 XSync( b->xm_visual->display, False );
540 XFreeGC( b->xm_visual->display, gc );
541 (void) XSetErrorHandler( old_handler );
542 if (mesaXErrorFlag) {
543 XFlush( b->xm_visual->display );
544 mesaXErrorFlag = 0;
545 XDestroyImage( b->backimage );
546 shmdt( b->shminfo.shmaddr );
547 shmctl( b->shminfo.shmid, IPC_RMID, 0 );
548 b->backimage = NULL;
549 b->shm = 0;
550 return GL_FALSE;
551 }
552
553 if (b->backimage) {
554 int height = b->backimage->height;
555 /* Needed by PIXELADDR1 macro */
556 b->ximage_width1 = b->backimage->bytes_per_line;
557 b->ximage_origin1 = (GLubyte *) b->backimage->data
558 + b->ximage_width1 * (height-1);
559 /* Needed by PIXELADDR2 macro */
560 b->ximage_width2 = b->backimage->bytes_per_line / 2;
561 b->ximage_origin2 = (GLushort *) b->backimage->data
562 + b->ximage_width2 * (height-1);
563 /* Needed by PIXELADDR3 macro */
564 b->ximage_width3 = b->backimage->bytes_per_line;
565 b->ximage_origin3 = (GLubyte *) b->backimage->data
566 + b->ximage_width3 * (height-1);
567 /* Needed by PIXELADDR4 macro */
568 b->ximage_width4 = b->backimage->width;
569 b->ximage_origin4 = (GLuint *) b->backimage->data
570 + b->ximage_width4 * (height-1);
571 }
572
573 return GL_TRUE;
574 #else
575 /* Can't compile XSHM support */
576 return GL_FALSE;
577 #endif
578 }
579 #endif
580
581
582
583 /*
584 * Setup an off-screen pixmap or Ximage to use as the back buffer.
585 * Input: b - the X/Mesa buffer
586 */
587 void xmesa_alloc_back_buffer( XMesaBuffer b )
588 {
589 if (b->db_state==BACK_XIMAGE) {
590 /* Deallocate the old backimage, if any */
591 if (b->backimage) {
592 #if defined(USE_XSHM) && !defined(XFree86Server)
593 if (b->shm) {
594 XShmDetach( b->xm_visual->display, &b->shminfo );
595 XDestroyImage( b->backimage );
596 shmdt( b->shminfo.shmaddr );
597 }
598 else
599 #endif
600 XMesaDestroyImage( b->backimage );
601 b->backimage = NULL;
602 }
603
604 /* Allocate new back buffer */
605 #ifdef XFree86Server
606 {
607 /* Allocate a regular XImage for the back buffer. */
608 b->backimage = XMesaCreateImage(b->xm_visual->BitsPerPixel,
609 b->width, b->height, NULL);
610 #else
611 if (b->shm==0 || alloc_shm_back_buffer(b)==GL_FALSE) {
612 /* Allocate a regular XImage for the back buffer. */
613 b->backimage = XCreateImage( b->xm_visual->display,
614 b->xm_visual->visinfo->visual,
615 GET_VISUAL_DEPTH(b->xm_visual),
616 ZPixmap, 0, /* format, offset */
617 NULL, b->width, b->height,
618 8, 0 ); /* pad, bytes_per_line */
619 #endif
620 if (!b->backimage) {
621 _mesa_warning(NULL, "alloc_back_buffer: XCreateImage failed.");
622 }
623 b->backimage->data = (char *) MALLOC( b->backimage->height
624 * b->backimage->bytes_per_line );
625 if (!b->backimage->data) {
626 _mesa_warning(NULL, "alloc_back_buffer: MALLOC failed.");
627 XMesaDestroyImage( b->backimage );
628 b->backimage = NULL;
629 }
630 }
631 b->backpixmap = None;
632 }
633 else if (b->db_state==BACK_PIXMAP) {
634 XMesaPixmap old_pixmap = b->backpixmap;
635 /* Free the old back pixmap */
636 if (b->backpixmap) {
637 XMesaFreePixmap( b->xm_visual->display, b->backpixmap );
638 }
639 /* Allocate new back pixmap */
640 b->backpixmap = XMesaCreatePixmap( b->xm_visual->display, b->frontbuffer,
641 b->width, b->height,
642 GET_VISUAL_DEPTH(b->xm_visual) );
643 b->backimage = NULL;
644 /* update other references to backpixmap */
645 if (b->buffer==(XMesaDrawable)old_pixmap) {
646 b->buffer = (XMesaDrawable)b->backpixmap;
647 }
648 }
649 }
650
651
652
653 /*
654 * A replacement for XAllocColor. This function should never
655 * fail to allocate a color. When XAllocColor fails, we return
656 * the nearest matching color. If we have to allocate many colors
657 * this function isn't too efficient; the XQueryColors() could be
658 * done just once.
659 * Written by Michael Pichler, Brian Paul, Mark Kilgard
660 * Input: dpy - X display
661 * cmap - X colormap
662 * cmapSize - size of colormap
663 * In/Out: color - the XColor struct
664 * Output: exact - 1=exact color match, 0=closest match
665 * alloced - 1=XAlloc worked, 0=XAlloc failed
666 */
667 static void
668 noFaultXAllocColor( int client,
669 XMesaDisplay *dpy,
670 XMesaColormap cmap,
671 int cmapSize,
672 XMesaColor *color,
673 int *exact, int *alloced )
674 {
675 #ifdef XFree86Server
676 Pixel *ppixIn;
677 xrgb *ctable;
678 #else
679 /* we'll try to cache ctable for better remote display performance */
680 static Display *prevDisplay = NULL;
681 static XMesaColormap prevCmap = 0;
682 static int prevCmapSize = 0;
683 static XMesaColor *ctable = NULL;
684 #endif
685 XMesaColor subColor;
686 int i, bestmatch;
687 double mindist; /* 3*2^16^2 exceeds long int precision. */
688
689 (void) client;
690
691 /* First try just using XAllocColor. */
692 #ifdef XFree86Server
693 if (AllocColor(cmap,
694 &color->red, &color->green, &color->blue,
695 &color->pixel,
696 client) == Success) {
697 #else
698 if (XAllocColor(dpy, cmap, color)) {
699 #endif
700 *exact = 1;
701 *alloced = 1;
702 return;
703 }
704
705 /* Alloc failed, search for closest match */
706
707 /* Retrieve color table entries. */
708 /* XXX alloca candidate. */
709 #ifdef XFree86Server
710 ppixIn = (Pixel *) MALLOC(cmapSize * sizeof(Pixel));
711 ctable = (xrgb *) MALLOC(cmapSize * sizeof(xrgb));
712 for (i = 0; i < cmapSize; i++) {
713 ppixIn[i] = i;
714 }
715 QueryColors(cmap, cmapSize, ppixIn, ctable);
716 #else
717 if (prevDisplay != dpy || prevCmap != cmap
718 || prevCmapSize != cmapSize || !ctable) {
719 /* free previously cached color table */
720 if (ctable)
721 FREE(ctable);
722 /* Get the color table from X */
723 ctable = (XMesaColor *) MALLOC(cmapSize * sizeof(XMesaColor));
724 assert(ctable);
725 for (i = 0; i < cmapSize; i++) {
726 ctable[i].pixel = i;
727 }
728 XQueryColors(dpy, cmap, ctable, cmapSize);
729 prevDisplay = dpy;
730 prevCmap = cmap;
731 prevCmapSize = cmapSize;
732 }
733 #endif
734
735 /* Find best match. */
736 bestmatch = -1;
737 mindist = 0.0;
738 for (i = 0; i < cmapSize; i++) {
739 double dr = 0.30 * ((double) color->red - (double) ctable[i].red);
740 double dg = 0.59 * ((double) color->green - (double) ctable[i].green);
741 double db = 0.11 * ((double) color->blue - (double) ctable[i].blue);
742 double dist = dr * dr + dg * dg + db * db;
743 if (bestmatch < 0 || dist < mindist) {
744 bestmatch = i;
745 mindist = dist;
746 }
747 }
748
749 /* Return result. */
750 subColor.red = ctable[bestmatch].red;
751 subColor.green = ctable[bestmatch].green;
752 subColor.blue = ctable[bestmatch].blue;
753 /* Try to allocate the closest match color. This should only
754 * fail if the cell is read/write. Otherwise, we're incrementing
755 * the cell's reference count.
756 */
757 #ifdef XFree86Server
758 if (AllocColor(cmap,
759 &subColor.red, &subColor.green, &subColor.blue,
760 &subColor.pixel,
761 client) == Success) {
762 #else
763 if (XAllocColor(dpy, cmap, &subColor)) {
764 #endif
765 *alloced = 1;
766 }
767 else {
768 /* do this to work around a problem reported by Frank Ortega */
769 subColor.pixel = (unsigned long) bestmatch;
770 subColor.red = ctable[bestmatch].red;
771 subColor.green = ctable[bestmatch].green;
772 subColor.blue = ctable[bestmatch].blue;
773 subColor.flags = DoRed | DoGreen | DoBlue;
774 *alloced = 0;
775 }
776 #ifdef XFree86Server
777 FREE(ppixIn);
778 FREE(ctable);
779 #else
780 /* don't free table, save it for next time */
781 #endif
782
783 *color = subColor;
784 *exact = 0;
785 }
786
787
788
789
790 /*
791 * Do setup for PF_GRAYSCALE pixel format.
792 * Note that buffer may be NULL.
793 */
794 static GLboolean setup_grayscale( int client, XMesaVisual v,
795 XMesaBuffer buffer, XMesaColormap cmap )
796 {
797 if (GET_VISUAL_DEPTH(v)<4 || GET_VISUAL_DEPTH(v)>16) {
798 return GL_FALSE;
799 }
800
801 if (buffer) {
802 XMesaBuffer prevBuffer;
803
804 if (!cmap) {
805 return GL_FALSE;
806 }
807
808 prevBuffer = find_xmesa_buffer(v->display, cmap, buffer);
809 if (prevBuffer &&
810 (buffer->xm_visual->mesa_visual.rgbMode ==
811 prevBuffer->xm_visual->mesa_visual.rgbMode)) {
812 /* Copy colormap stuff from previous XMesaBuffer which uses same
813 * X colormap. Do this to avoid time spent in noFaultXAllocColor.
814 */
815 copy_colortable_info(buffer, prevBuffer);
816 }
817 else {
818 /* Allocate 256 shades of gray */
819 int gray;
820 int colorsfailed = 0;
821 for (gray=0;gray<256;gray++) {
822 GLint r = gamma_adjust( v->RedGamma, gray, 255 );
823 GLint g = gamma_adjust( v->GreenGamma, gray, 255 );
824 GLint b = gamma_adjust( v->BlueGamma, gray, 255 );
825 int exact, alloced;
826 XMesaColor xcol;
827 xcol.red = (r << 8) | r;
828 xcol.green = (g << 8) | g;
829 xcol.blue = (b << 8) | b;
830 noFaultXAllocColor( client, v->display,
831 cmap, GET_COLORMAP_SIZE(v),
832 &xcol, &exact, &alloced );
833 if (!exact) {
834 colorsfailed++;
835 }
836 if (alloced) {
837 assert(buffer->num_alloced<256);
838 buffer->alloced_colors[buffer->num_alloced] = xcol.pixel;
839 buffer->num_alloced++;
840 }
841
842 /*OLD
843 assert(gray < 576);
844 buffer->color_table[gray*3+0] = xcol.pixel;
845 buffer->color_table[gray*3+1] = xcol.pixel;
846 buffer->color_table[gray*3+2] = xcol.pixel;
847 assert(xcol.pixel < 65536);
848 buffer->pixel_to_r[xcol.pixel] = gray * 30 / 100;
849 buffer->pixel_to_g[xcol.pixel] = gray * 59 / 100;
850 buffer->pixel_to_b[xcol.pixel] = gray * 11 / 100;
851 */
852 buffer->color_table[gray] = xcol.pixel;
853 assert(xcol.pixel < 65536);
854 buffer->pixel_to_r[xcol.pixel] = gray;
855 buffer->pixel_to_g[xcol.pixel] = gray;
856 buffer->pixel_to_b[xcol.pixel] = gray;
857 }
858
859 if (colorsfailed && _mesa_getenv("MESA_DEBUG")) {
860 _mesa_warning(NULL,
861 "Note: %d out of 256 needed colors do not match exactly.\n",
862 colorsfailed );
863 }
864 }
865 }
866
867 v->dithered_pf = PF_Grayscale;
868 v->undithered_pf = PF_Grayscale;
869 return GL_TRUE;
870 }
871
872
873
874 /*
875 * Setup RGB rendering for a window with a PseudoColor, StaticColor,
876 * or 8-bit TrueColor visual visual. We try to allocate a palette of 225
877 * colors (5 red, 9 green, 5 blue) and dither to approximate a 24-bit RGB
878 * color. While this function was originally designed just for 8-bit
879 * visuals, it has also proven to work from 4-bit up to 16-bit visuals.
880 * Dithering code contributed by Bob Mercier.
881 */
882 static GLboolean setup_dithered_color( int client, XMesaVisual v,
883 XMesaBuffer buffer, XMesaColormap cmap )
884 {
885 if (GET_VISUAL_DEPTH(v)<4 || GET_VISUAL_DEPTH(v)>16) {
886 return GL_FALSE;
887 }
888
889 if (buffer) {
890 XMesaBuffer prevBuffer;
891
892 if (!cmap) {
893 return GL_FALSE;
894 }
895
896 prevBuffer = find_xmesa_buffer(v->display, cmap, buffer);
897 if (prevBuffer &&
898 (buffer->xm_visual->mesa_visual.rgbMode ==
899 prevBuffer->xm_visual->mesa_visual.rgbMode)) {
900 /* Copy colormap stuff from previous, matching XMesaBuffer.
901 * Do this to avoid time spent in noFaultXAllocColor.
902 */
903 copy_colortable_info(buffer, prevBuffer);
904 }
905 else {
906 /* Allocate X colors and initialize color_table[], red_table[], etc */
907 int r, g, b, i;
908 int colorsfailed = 0;
909 for (r = 0; r < DITH_R; r++) {
910 for (g = 0; g < DITH_G; g++) {
911 for (b = 0; b < DITH_B; b++) {
912 XMesaColor xcol;
913 int exact, alloced;
914 xcol.red =gamma_adjust(v->RedGamma, r*65535/(DITH_R-1),65535);
915 xcol.green=gamma_adjust(v->GreenGamma, g*65535/(DITH_G-1),65535);
916 xcol.blue =gamma_adjust(v->BlueGamma, b*65535/(DITH_B-1),65535);
917 noFaultXAllocColor( client, v->display,
918 cmap, GET_COLORMAP_SIZE(v),
919 &xcol, &exact, &alloced );
920 if (!exact) {
921 colorsfailed++;
922 }
923 if (alloced) {
924 assert(buffer->num_alloced<256);
925 buffer->alloced_colors[buffer->num_alloced] = xcol.pixel;
926 buffer->num_alloced++;
927 }
928 i = DITH_MIX( r, g, b );
929 assert(i < 576);
930 buffer->color_table[i] = xcol.pixel;
931 assert(xcol.pixel < 65536);
932 buffer->pixel_to_r[xcol.pixel] = r * 255 / (DITH_R-1);
933 buffer->pixel_to_g[xcol.pixel] = g * 255 / (DITH_G-1);
934 buffer->pixel_to_b[xcol.pixel] = b * 255 / (DITH_B-1);
935 }
936 }
937 }
938
939 if (colorsfailed && _mesa_getenv("MESA_DEBUG")) {
940 _mesa_warning(NULL,
941 "Note: %d out of %d needed colors do not match exactly.\n",
942 colorsfailed, DITH_R * DITH_G * DITH_B );
943 }
944 }
945 }
946
947 v->dithered_pf = PF_Dither;
948 v->undithered_pf = PF_Lookup;
949 return GL_TRUE;
950 }
951
952
953 /*
954 * Setup for Hewlett Packard Color Recovery 8-bit TrueColor mode.
955 * HPCR simulates 24-bit color fidelity with an 8-bit frame buffer.
956 * Special dithering tables have to be initialized.
957 */
958 static void setup_8bit_hpcr( XMesaVisual v )
959 {
960 /* HP Color Recovery contributed by: Alex De Bruyn (ad@lms.be)
961 * To work properly, the atom _HP_RGB_SMOOTH_MAP_LIST must be defined
962 * on the root window AND the colormap obtainable by XGetRGBColormaps
963 * for that atom must be set on the window. (see also tkInitWindow)
964 * If that colormap is not set, the output will look stripy.
965 */
966
967 /* Setup color tables with gamma correction */
968 int i;
969 double g;
970
971 g = 1.0 / v->RedGamma;
972 for (i=0; i<256; i++) {
973 GLint red = IROUND_POS(255.0 * _mesa_pow( hpcr_rgbTbl[0][i]/255.0, g ));
974 v->hpcr_rgbTbl[0][i] = CLAMP( red, 16, 239 );
975 }
976
977 g = 1.0 / v->GreenGamma;
978 for (i=0; i<256; i++) {
979 GLint green = IROUND_POS(255.0 * _mesa_pow( hpcr_rgbTbl[1][i]/255.0, g ));
980 v->hpcr_rgbTbl[1][i] = CLAMP( green, 16, 239 );
981 }
982
983 g = 1.0 / v->BlueGamma;
984 for (i=0; i<256; i++) {
985 GLint blue = IROUND_POS(255.0 * _mesa_pow( hpcr_rgbTbl[2][i]/255.0, g ));
986 v->hpcr_rgbTbl[2][i] = CLAMP( blue, 32, 223 );
987 }
988 v->undithered_pf = PF_HPCR; /* can't really disable dithering for now */
989 v->dithered_pf = PF_HPCR;
990
991 /* which method should I use to clear */
992 /* GL_FALSE: keep the ordinary method */
993 /* GL_TRUE : clear with dither pattern */
994 v->hpcr_clear_flag = _mesa_getenv("MESA_HPCR_CLEAR") ? GL_TRUE : GL_FALSE;
995
996 if (v->hpcr_clear_flag) {
997 v->hpcr_clear_pixmap = XMesaCreatePixmap(v->display,
998 DefaultRootWindow(v->display),
999 16, 2, 8);
1000 #ifndef XFree86Server
1001 v->hpcr_clear_ximage = XGetImage(v->display, v->hpcr_clear_pixmap,
1002 0, 0, 16, 2, AllPlanes, ZPixmap);
1003 #endif
1004 }
1005 }
1006
1007
1008 /*
1009 * Setup RGB rendering for a window with a True/DirectColor visual.
1010 */
1011 static void setup_truecolor( XMesaVisual v, XMesaBuffer buffer,
1012 XMesaColormap cmap )
1013 {
1014 unsigned long rmask, gmask, bmask;
1015 (void) buffer;
1016 (void) cmap;
1017
1018 /* Compute red multiplier (mask) and bit shift */
1019 v->rshift = 0;
1020 rmask = GET_REDMASK(v);
1021 while ((rmask & 1)==0) {
1022 v->rshift++;
1023 rmask = rmask >> 1;
1024 }
1025
1026 /* Compute green multiplier (mask) and bit shift */
1027 v->gshift = 0;
1028 gmask = GET_GREENMASK(v);
1029 while ((gmask & 1)==0) {
1030 v->gshift++;
1031 gmask = gmask >> 1;
1032 }
1033
1034 /* Compute blue multiplier (mask) and bit shift */
1035 v->bshift = 0;
1036 bmask = GET_BLUEMASK(v);
1037 while ((bmask & 1)==0) {
1038 v->bshift++;
1039 bmask = bmask >> 1;
1040 }
1041
1042 /*
1043 * Compute component-to-pixel lookup tables and dithering kernel
1044 */
1045 {
1046 static GLubyte kernel[16] = {
1047 0*16, 8*16, 2*16, 10*16,
1048 12*16, 4*16, 14*16, 6*16,
1049 3*16, 11*16, 1*16, 9*16,
1050 15*16, 7*16, 13*16, 5*16,
1051 };
1052 GLint rBits = bitcount(rmask);
1053 GLint gBits = bitcount(gmask);
1054 GLint bBits = bitcount(bmask);
1055 GLint maxBits;
1056 GLuint i;
1057
1058 /* convert pixel components in [0,_mask] to RGB values in [0,255] */
1059 for (i=0; i<=rmask; i++)
1060 v->PixelToR[i] = (unsigned char) ((i * 255) / rmask);
1061 for (i=0; i<=gmask; i++)
1062 v->PixelToG[i] = (unsigned char) ((i * 255) / gmask);
1063 for (i=0; i<=bmask; i++)
1064 v->PixelToB[i] = (unsigned char) ((i * 255) / bmask);
1065
1066 /* convert RGB values from [0,255] to pixel components */
1067
1068 for (i=0;i<256;i++) {
1069 GLint r = gamma_adjust(v->RedGamma, i, 255);
1070 GLint g = gamma_adjust(v->GreenGamma, i, 255);
1071 GLint b = gamma_adjust(v->BlueGamma, i, 255);
1072 v->RtoPixel[i] = (r >> (8-rBits)) << v->rshift;
1073 v->GtoPixel[i] = (g >> (8-gBits)) << v->gshift;
1074 v->BtoPixel[i] = (b >> (8-bBits)) << v->bshift;
1075 }
1076 /* overflow protection */
1077 for (i=256;i<512;i++) {
1078 v->RtoPixel[i] = v->RtoPixel[255];
1079 v->GtoPixel[i] = v->GtoPixel[255];
1080 v->BtoPixel[i] = v->BtoPixel[255];
1081 }
1082
1083 /* setup dithering kernel */
1084 maxBits = rBits;
1085 if (gBits > maxBits) maxBits = gBits;
1086 if (bBits > maxBits) maxBits = bBits;
1087 for (i=0;i<16;i++) {
1088 v->Kernel[i] = kernel[i] >> maxBits;
1089 }
1090
1091 v->undithered_pf = PF_Truecolor;
1092 v->dithered_pf = (GET_VISUAL_DEPTH(v)<24) ? PF_Dither_True : PF_Truecolor;
1093 }
1094
1095 /*
1096 * Now check for TrueColor visuals which we can optimize.
1097 */
1098 if ( GET_REDMASK(v) ==0x0000ff
1099 && GET_GREENMASK(v)==0x00ff00
1100 && GET_BLUEMASK(v) ==0xff0000
1101 && CHECK_BYTE_ORDER(v)
1102 && v->BitsPerPixel==32
1103 && sizeof(GLuint)==4
1104 && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
1105 /* common 32 bpp config used on SGI, Sun */
1106 v->undithered_pf = v->dithered_pf = PF_8A8B8G8R;
1107 }
1108 else if (GET_REDMASK(v) ==0xff0000
1109 && GET_GREENMASK(v)==0x00ff00
1110 && GET_BLUEMASK(v) ==0x0000ff
1111 && CHECK_BYTE_ORDER(v)
1112 && v->BitsPerPixel==32
1113 && sizeof(GLuint)==4
1114 && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
1115 /* common 32 bpp config used on Linux, HP, IBM */
1116 v->undithered_pf = v->dithered_pf = PF_8R8G8B;
1117 }
1118 else if (GET_REDMASK(v) ==0xff0000
1119 && GET_GREENMASK(v)==0x00ff00
1120 && GET_BLUEMASK(v) ==0x0000ff
1121 && CHECK_BYTE_ORDER(v)
1122 && v->BitsPerPixel==24
1123 && sizeof(GLuint)==4
1124 && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
1125 /* common packed 24 bpp config used on Linux */
1126 v->undithered_pf = v->dithered_pf = PF_8R8G8B24;
1127 }
1128 else if (GET_REDMASK(v) ==0xf800
1129 && GET_GREENMASK(v)==0x07e0
1130 && GET_BLUEMASK(v) ==0x001f
1131 && CHECK_BYTE_ORDER(v)
1132 && v->BitsPerPixel==16
1133 && sizeof(GLushort)==2
1134 && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
1135 /* 5-6-5 color weight on common PC VGA boards */
1136 v->undithered_pf = PF_5R6G5B;
1137 v->dithered_pf = PF_Dither_5R6G5B;
1138 }
1139 else if (GET_REDMASK(v) ==0xe0
1140 && GET_GREENMASK(v)==0x1c
1141 && GET_BLUEMASK(v) ==0x03
1142 && CHECK_FOR_HPCR(v)) {
1143 setup_8bit_hpcr( v );
1144 }
1145 }
1146
1147
1148
1149 /*
1150 * Setup RGB rendering for a window with a monochrome visual.
1151 */
1152 static void setup_monochrome( XMesaVisual v, XMesaBuffer b )
1153 {
1154 (void) b;
1155 v->dithered_pf = v->undithered_pf = PF_1Bit;
1156 /* if black=1 then we must flip pixel values */
1157 v->bitFlip = (GET_BLACK_PIXEL(v) != 0);
1158 }
1159
1160
1161
1162 /*
1163 * When a context is "made current" for the first time, we can finally
1164 * finish initializing the context's visual and buffer information.
1165 * Input: v - the XMesaVisual to initialize
1166 * b - the XMesaBuffer to initialize (may be NULL)
1167 * rgb_flag - TRUE = RGBA mode, FALSE = color index mode
1168 * window - the window/pixmap we're rendering into
1169 * cmap - the colormap associated with the window/pixmap
1170 * Return: GL_TRUE=success, GL_FALSE=failure
1171 */
1172 static GLboolean initialize_visual_and_buffer( int client,
1173 XMesaVisual v,
1174 XMesaBuffer b,
1175 GLboolean rgb_flag,
1176 XMesaDrawable window,
1177 XMesaColormap cmap )
1178 {
1179 #ifndef XFree86Server
1180 XGCValues gcvalues;
1181 #endif
1182
1183 if (b) {
1184 assert(b->xm_visual == v);
1185 }
1186
1187 /* Save true bits/pixel */
1188 v->BitsPerPixel = bits_per_pixel(v);
1189 assert(v->BitsPerPixel > 0);
1190
1191
1192 if (rgb_flag==GL_FALSE) {
1193 /* COLOR-INDEXED WINDOW:
1194 * Even if the visual is TrueColor or DirectColor we treat it as
1195 * being color indexed. This is weird but might be useful to someone.
1196 */
1197 v->dithered_pf = v->undithered_pf = PF_Index;
1198 v->index_bits = GET_VISUAL_DEPTH(v);
1199 }
1200 else {
1201 /* RGB WINDOW:
1202 * We support RGB rendering into almost any kind of visual.
1203 */
1204 int xclass;
1205 xclass = GET_VISUAL_CLASS(v);
1206 if (xclass==TrueColor || xclass==DirectColor) {
1207 setup_truecolor( v, b, cmap );
1208 }
1209 else if (xclass==StaticGray && GET_VISUAL_DEPTH(v)==1) {
1210 setup_monochrome( v, b );
1211 }
1212 else if (xclass==GrayScale || xclass==StaticGray) {
1213 if (!setup_grayscale( client, v, b, cmap )) {
1214 return GL_FALSE;
1215 }
1216 }
1217 else if ((xclass==PseudoColor || xclass==StaticColor)
1218 && GET_VISUAL_DEPTH(v)>=4 && GET_VISUAL_DEPTH(v)<=16) {
1219 if (!setup_dithered_color( client, v, b, cmap )) {
1220 return GL_FALSE;
1221 }
1222 }
1223 else {
1224 _mesa_warning(NULL, "XMesa: RGB mode rendering not supported in given visual.");
1225 return GL_FALSE;
1226 }
1227 v->index_bits = 0;
1228
1229 if (_mesa_getenv("MESA_NO_DITHER")) {
1230 v->dithered_pf = v->undithered_pf;
1231 }
1232 }
1233
1234
1235 /*
1236 * If MESA_INFO env var is set print out some debugging info
1237 * which can help Brian figure out what's going on when a user
1238 * reports bugs.
1239 */
1240 if (_mesa_getenv("MESA_INFO")) {
1241 _mesa_printf("X/Mesa visual = %p\n", (void *) v);
1242 _mesa_printf("X/Mesa dithered pf = %u\n", v->dithered_pf);
1243 _mesa_printf("X/Mesa undithered pf = %u\n", v->undithered_pf);
1244 _mesa_printf("X/Mesa level = %d\n", v->level);
1245 _mesa_printf("X/Mesa depth = %d\n", GET_VISUAL_DEPTH(v));
1246 _mesa_printf("X/Mesa bits per pixel = %d\n", v->BitsPerPixel);
1247 }
1248
1249 if (b && window) {
1250 /* Do window-specific initializations */
1251
1252 /* Window dimensions */
1253 unsigned int w, h;
1254 get_drawable_size( v->display, window, &w, &h );
1255 b->width = w;
1256 b->height = h;
1257
1258 b->frontbuffer = window;
1259
1260 /* Setup for single/double buffering */
1261 if (v->mesa_visual.doubleBufferMode) {
1262 /* Double buffered */
1263 #ifndef XFree86Server
1264 b->shm = check_for_xshm( v->display );
1265 #endif
1266 xmesa_alloc_back_buffer( b );
1267 if (b->db_state==BACK_PIXMAP) {
1268 b->buffer = (XMesaDrawable)b->backpixmap;
1269 }
1270 else {
1271 b->buffer = XIMAGE;
1272 }
1273 }
1274 else {
1275 /* Single Buffered */
1276 b->buffer = b->frontbuffer;
1277 }
1278
1279 /* X11 graphics contexts */
1280 #ifdef XFree86Server
1281 b->gc = CreateScratchGC(v->display, window->depth);
1282 #else
1283 b->gc = XCreateGC( v->display, window, 0, NULL );
1284 #endif
1285 XMesaSetFunction( v->display, b->gc, GXcopy );
1286
1287 /* cleargc - for glClear() */
1288 #ifdef XFree86Server
1289 b->cleargc = CreateScratchGC(v->display, window->depth);
1290 #else
1291 b->cleargc = XCreateGC( v->display, window, 0, NULL );
1292 #endif
1293 XMesaSetFunction( v->display, b->cleargc, GXcopy );
1294
1295 /*
1296 * Don't generate Graphics Expose/NoExpose events in swapbuffers().
1297 * Patch contributed by Michael Pichler May 15, 1995.
1298 */
1299 #ifdef XFree86Server
1300 b->swapgc = CreateScratchGC(v->display, window->depth);
1301 {
1302 CARD32 v[1];
1303 v[0] = FALSE;
1304 dixChangeGC(NullClient, b->swapgc, GCGraphicsExposures, v, NULL);
1305 }
1306 #else
1307 gcvalues.graphics_exposures = False;
1308 b->swapgc = XCreateGC( v->display, window,
1309 GCGraphicsExposures, &gcvalues);
1310 #endif
1311 XMesaSetFunction( v->display, b->swapgc, GXcopy );
1312 /*
1313 * Set fill style and tile pixmap once for all for HPCR stuff
1314 * (instead of doing it each time in clear_color_HPCR_pixmap())
1315 * Initialize whole stuff
1316 * Patch contributed by Jacques Leroy March 8, 1998.
1317 */
1318 if (v->hpcr_clear_flag && b->buffer!=XIMAGE) {
1319 int i;
1320 for (i=0; i<16; i++)
1321 {
1322 XMesaPutPixel(v->hpcr_clear_ximage, i, 0, 0);
1323 XMesaPutPixel(v->hpcr_clear_ximage, i, 1, 0);
1324 }
1325 XMesaPutImage(b->display, (XMesaDrawable)v->hpcr_clear_pixmap,
1326 b->cleargc, v->hpcr_clear_ximage, 0, 0, 0, 0, 16, 2);
1327 XMesaSetFillStyle( v->display, b->cleargc, FillTiled);
1328 XMesaSetTile( v->display, b->cleargc, v->hpcr_clear_pixmap );
1329 }
1330
1331 /* Initialize the row buffer XImage for use in write_color_span() */
1332 #ifdef XFree86Server
1333 b->rowimage = XMesaCreateImage(GET_VISUAL_DEPTH(v), MAX_WIDTH, 1,
1334 (char *)MALLOC(MAX_WIDTH*4));
1335 #else
1336 b->rowimage = XCreateImage( v->display,
1337 v->visinfo->visual,
1338 v->visinfo->depth,
1339 ZPixmap, 0, /*format, offset*/
1340 (char*) MALLOC(MAX_WIDTH*4), /*data*/
1341 MAX_WIDTH, 1, /*width, height*/
1342 32, /*bitmap_pad*/
1343 0 /*bytes_per_line*/ );
1344 #endif
1345 }
1346
1347 return GL_TRUE;
1348 }
1349
1350
1351
1352 /*
1353 * Convert an RGBA color to a pixel value.
1354 */
1355 unsigned long
1356 xmesa_color_to_pixel( XMesaContext xmesa, GLubyte r, GLubyte g, GLubyte b, GLubyte a,
1357 GLuint pixelFormat)
1358 {
1359 switch (pixelFormat) {
1360 case PF_Index:
1361 return 0;
1362 case PF_Truecolor:
1363 {
1364 unsigned long p;
1365 PACK_TRUECOLOR( p, r, g, b );
1366 return p;
1367 }
1368 case PF_8A8B8G8R:
1369 return PACK_8A8B8G8R( r, g, b, a );
1370 case PF_8R8G8B:
1371 /* fall through */
1372 case PF_8R8G8B24:
1373 return PACK_8R8G8B( r, g, b );
1374 case PF_5R6G5B:
1375 return PACK_5R6G5B( r, g, b );
1376 case PF_Dither:
1377 {
1378 DITHER_SETUP;
1379 return DITHER( 1, 0, r, g, b );
1380 }
1381 case PF_1Bit:
1382 /* 382 = (3*255)/2 */
1383 return ((r+g+b) > 382) ^ xmesa->xm_visual->bitFlip;
1384 case PF_HPCR:
1385 return DITHER_HPCR(1, 1, r, g, b);
1386 case PF_Lookup:
1387 {
1388 LOOKUP_SETUP;
1389 return LOOKUP( r, g, b );
1390 }
1391 case PF_Grayscale:
1392 return GRAY_RGB( r, g, b );
1393 case PF_Dither_True:
1394 /* fall through */
1395 case PF_Dither_5R6G5B:
1396 {
1397 unsigned long p;
1398 PACK_TRUEDITHER(p, 1, 0, r, g, b);
1399 return p;
1400 }
1401 default:
1402 _mesa_problem(NULL, "Bad pixel format in xmesa_color_to_pixel");
1403 }
1404 return 0;
1405 }
1406
1407
1408 /**********************************************************************/
1409 /***** Public Functions *****/
1410 /**********************************************************************/
1411
1412
1413 /*
1414 * Create a new X/Mesa visual.
1415 * Input: display - X11 display
1416 * visinfo - an XVisualInfo pointer
1417 * rgb_flag - GL_TRUE = RGB mode,
1418 * GL_FALSE = color index mode
1419 * alpha_flag - alpha buffer requested?
1420 * db_flag - GL_TRUE = double-buffered,
1421 * GL_FALSE = single buffered
1422 * stereo_flag - stereo visual?
1423 * ximage_flag - GL_TRUE = use an XImage for back buffer,
1424 * GL_FALSE = use an off-screen pixmap for back buffer
1425 * depth_size - requested bits/depth values, or zero
1426 * stencil_size - requested bits/stencil values, or zero
1427 * accum_red_size - requested bits/red accum values, or zero
1428 * accum_green_size - requested bits/green accum values, or zero
1429 * accum_blue_size - requested bits/blue accum values, or zero
1430 * accum_alpha_size - requested bits/alpha accum values, or zero
1431 * num_samples - number of samples/pixel if multisampling, or zero
1432 * level - visual level, usually 0
1433 * visualCaveat - ala the GLX extension, usually GLX_NONE_EXT
1434 * Return; a new XMesaVisual or 0 if error.
1435 */
1436 XMesaVisual XMesaCreateVisual( XMesaDisplay *display,
1437 XMesaVisualInfo visinfo,
1438 GLboolean rgb_flag,
1439 GLboolean alpha_flag,
1440 GLboolean db_flag,
1441 GLboolean stereo_flag,
1442 GLboolean ximage_flag,
1443 GLint depth_size,
1444 GLint stencil_size,
1445 GLint accum_red_size,
1446 GLint accum_green_size,
1447 GLint accum_blue_size,
1448 GLint accum_alpha_size,
1449 GLint num_samples,
1450 GLint level,
1451 GLint visualCaveat )
1452 {
1453 char *gamma;
1454 XMesaVisual v;
1455 GLint red_bits, green_bits, blue_bits, alpha_bits;
1456
1457 /* For debugging only */
1458 if (_mesa_getenv("MESA_XSYNC")) {
1459 /* This makes debugging X easier.
1460 * In your debugger, set a breakpoint on _XError to stop when an
1461 * X protocol error is generated.
1462 */
1463 #ifdef XFree86Server
1464 /* NOT_NEEDED */
1465 #else
1466 XSynchronize( display, 1 );
1467 #endif
1468 }
1469
1470 v = (XMesaVisual) CALLOC_STRUCT(xmesa_visual);
1471 if (!v) {
1472 return NULL;
1473 }
1474
1475 /*
1476 * In the X server, NULL is passed in for the display. It will have
1477 * to be set before using this visual. See XMesaSetVisualDisplay()
1478 * below.
1479 */
1480 v->display = display;
1481
1482 /* Save a copy of the XVisualInfo struct because the user may XFREE()
1483 * the struct but we may need some of the information contained in it
1484 * at a later time.
1485 */
1486 #ifdef XFree86Server
1487 v->visinfo = visinfo;
1488 #else
1489 v->visinfo = (XVisualInfo *) MALLOC(sizeof(*visinfo));
1490 if(!v->visinfo) {
1491 FREE(v);
1492 return NULL;
1493 }
1494 MEMCPY(v->visinfo, visinfo, sizeof(*visinfo));
1495 #endif
1496
1497 #ifdef XFree86Server
1498 /* Initialize the depth of the screen */
1499 {
1500 PixmapFormatRec *format;
1501
1502 for (format = screenInfo.formats;
1503 format->depth != display->rootDepth;
1504 format++)
1505 ;
1506 v->screen_depth = format->bitsPerPixel;
1507 }
1508 #endif
1509
1510 /* check for MESA_GAMMA environment variable */
1511 gamma = _mesa_getenv("MESA_GAMMA");
1512 if (gamma) {
1513 v->RedGamma = v->GreenGamma = v->BlueGamma = 0.0;
1514 sscanf( gamma, "%f %f %f", &v->RedGamma, &v->GreenGamma, &v->BlueGamma );
1515 if (v->RedGamma<=0.0) v->RedGamma = 1.0;
1516 if (v->GreenGamma<=0.0) v->GreenGamma = v->RedGamma;
1517 if (v->BlueGamma<=0.0) v->BlueGamma = v->RedGamma;
1518 }
1519 else {
1520 v->RedGamma = v->GreenGamma = v->BlueGamma = 1.0;
1521 }
1522
1523 v->ximage_flag = ximage_flag;
1524 v->level = level;
1525 v->VisualCaveat = visualCaveat;
1526
1527 (void) initialize_visual_and_buffer( 0, v, NULL, rgb_flag, 0, 0 );
1528
1529 {
1530 int xclass;
1531 xclass = GET_VISUAL_CLASS(v);
1532 if (xclass==TrueColor || xclass==DirectColor) {
1533 red_bits = bitcount(GET_REDMASK(v));
1534 green_bits = bitcount(GET_GREENMASK(v));
1535 blue_bits = bitcount(GET_BLUEMASK(v));
1536 alpha_bits = 0;
1537 }
1538 else {
1539 /* this is an approximation */
1540 int depth;
1541 depth = GET_VISUAL_DEPTH(v);
1542 red_bits = depth / 3;
1543 depth -= red_bits;
1544 green_bits = depth / 2;
1545 depth -= green_bits;
1546 blue_bits = depth;
1547 alpha_bits = 0;
1548 assert( red_bits + green_bits + blue_bits == GET_VISUAL_DEPTH(v) );
1549 }
1550 }
1551
1552 if (alpha_flag && alpha_bits == 0)
1553 alpha_bits = 8;
1554
1555 _mesa_initialize_visual( &v->mesa_visual,
1556 rgb_flag, db_flag, stereo_flag,
1557 red_bits, green_bits,
1558 blue_bits, alpha_bits,
1559 v->index_bits,
1560 depth_size,
1561 stencil_size,
1562 accum_red_size, accum_green_size,
1563 accum_blue_size, accum_alpha_size,
1564 0 );
1565 return v;
1566 }
1567
1568
1569 void XMesaSetVisualDisplay( XMesaDisplay *dpy, XMesaVisual v )
1570 {
1571 v->display = dpy;
1572 }
1573
1574
1575 void XMesaDestroyVisual( XMesaVisual v )
1576 {
1577 #ifndef XFree86Server
1578 FREE(v->visinfo);
1579 #endif
1580 FREE(v);
1581 }
1582
1583
1584
1585 /*
1586 * Create a new XMesaContext.
1587 * Input: v - XMesaVisual
1588 * share_list - another XMesaContext with which to share display
1589 * lists or NULL if no sharing is wanted.
1590 * Return: an XMesaContext or NULL if error.
1591 */
1592 XMesaContext XMesaCreateContext( XMesaVisual v, XMesaContext share_list )
1593 {
1594 static GLboolean firstTime = GL_TRUE;
1595 XMesaContext c;
1596 GLboolean direct = GL_TRUE; /* not really */
1597 GLcontext *mesaCtx;
1598
1599 if (firstTime) {
1600 _glthread_INIT_MUTEX(_xmesa_lock);
1601 firstTime = GL_FALSE;
1602 }
1603
1604 c = (XMesaContext) CALLOC_STRUCT(xmesa_context);
1605 if (!c) {
1606 return NULL;
1607 }
1608
1609 mesaCtx = &(c->mesa);
1610
1611 /* Setup these pointers here since they're using for making the default
1612 * and proxy texture objects. Actually, we don't really need to do
1613 * this since we're using the default fallback functions which
1614 * _mesa_initialize_context() would plug in if needed.
1615 */
1616 mesaCtx->Driver.NewTextureObject = _mesa_new_texture_object;
1617 mesaCtx->Driver.DeleteTexture = _mesa_delete_texture_object;
1618
1619 if (!_mesa_initialize_context(mesaCtx, &v->mesa_visual,
1620 share_list ? &(share_list->mesa) : (GLcontext *) NULL,
1621 (void *) c, direct)) {
1622 FREE(c);
1623 return NULL;
1624 }
1625
1626 _mesa_enable_sw_extensions(mesaCtx);
1627 _mesa_enable_1_3_extensions(mesaCtx);
1628 _mesa_enable_1_4_extensions(mesaCtx);
1629 _mesa_enable_1_5_extensions(mesaCtx);
1630
1631 if (CHECK_BYTE_ORDER(v)) {
1632 c->swapbytes = GL_FALSE;
1633 }
1634 else {
1635 c->swapbytes = GL_TRUE;
1636 }
1637
1638 c->xm_visual = v;
1639 c->xm_draw_buffer = NULL; /* set later by XMesaMakeCurrent */
1640 c->xm_read_buffer = NULL; /* set later by XMesaMakeCurrent */
1641 c->xm_buffer = NULL; /* set later by XMesaMakeCurrent */
1642 c->display = v->display;
1643 c->pixelformat = v->dithered_pf; /* Dithering is enabled by default */
1644
1645 mesaCtx->Driver.UpdateState = xmesa_update_state;
1646
1647 /* Initialize the software rasterizer and helper modules.
1648 */
1649 _swrast_CreateContext( mesaCtx );
1650 _ac_CreateContext( mesaCtx );
1651 _tnl_CreateContext( mesaCtx );
1652 _swsetup_CreateContext( mesaCtx );
1653
1654 xmesa_register_swrast_functions( mesaCtx );
1655
1656 /* Set up some constant pointers:
1657 */
1658 xmesa_init_pointers( mesaCtx );
1659
1660 return c;
1661 }
1662
1663
1664
1665
1666 void XMesaDestroyContext( XMesaContext c )
1667 {
1668 GLcontext *mesaCtx = &c->mesa;
1669 #ifdef FX
1670 if (c->xm_draw_buffer && c->xm_buffer->FXctx)
1671 fxMesaDestroyContext(c->xm_draw_buffer->FXctx);
1672 #endif
1673 _swsetup_DestroyContext( mesaCtx );
1674 _swrast_DestroyContext( mesaCtx );
1675 _tnl_DestroyContext( mesaCtx );
1676 _ac_DestroyContext( mesaCtx );
1677 _mesa_free_context_data( mesaCtx );
1678 _mesa_free( c );
1679 }
1680
1681
1682
1683 /*
1684 * XXX this isn't a public function! It's a hack for the 3Dfx driver.
1685 * Create a new XMesaBuffer from an X window.
1686 * Input: v - the XMesaVisual
1687 * w - the window
1688 * c - the context
1689 * Return: new XMesaBuffer or NULL if error
1690 */
1691 XMesaBuffer XMesaCreateWindowBuffer2( XMesaVisual v, XMesaWindow w,
1692 XMesaContext c )
1693 {
1694 #ifndef XFree86Server
1695 XWindowAttributes attr;
1696 #endif
1697 #ifdef FX
1698 char *fxEnvVar;
1699 #endif
1700 int client = 0;
1701
1702 XMesaBuffer b = alloc_xmesa_buffer();
1703 if (!b) {
1704 return NULL;
1705 }
1706
1707 (void) c;
1708
1709 #ifdef XFree86Server
1710 client = CLIENT_ID(((XMesaDrawable)w)->id);
1711 #endif
1712
1713 assert(v);
1714
1715 #ifdef XFree86Server
1716 if (GET_VISUAL_DEPTH(v) != ((XMesaDrawable)w)->depth) {
1717 #else
1718 XGetWindowAttributes( v->display, w, &attr );
1719
1720 if (GET_VISUAL_DEPTH(v) != attr.depth) {
1721 #endif
1722 _mesa_warning(NULL, "XMesaCreateWindowBuffer: depth mismatch between visual and window!\n");
1723 return NULL;
1724 }
1725
1726 b->xm_visual = v;
1727 b->type = WINDOW;
1728 b->display = v->display;
1729 #ifdef XFree86Server
1730 b->cmap = (ColormapPtr)LookupIDByType(wColormap(w), RT_COLORMAP);
1731 #else
1732 if (attr.colormap) {
1733 b->cmap = attr.colormap;
1734 }
1735 else {
1736 _mesa_warning(NULL, "Window %u has no colormap!\n", (unsigned int) w);
1737 /* this is weird, a window w/out a colormap!? */
1738 /* OK, let's just allocate a new one and hope for the best */
1739 b->cmap = XCreateColormap(v->display, w, attr.visual, AllocNone);
1740 }
1741 #endif
1742
1743 /* determine back buffer implementation */
1744 if (v->mesa_visual.doubleBufferMode) {
1745 if (v->ximage_flag) {
1746 b->db_state = BACK_XIMAGE;
1747 }
1748 else {
1749 b->db_state = BACK_PIXMAP;
1750 }
1751 }
1752 else {
1753 b->db_state = 0;
1754 }
1755
1756 _mesa_initialize_framebuffer(&b->mesa_buffer,
1757 &v->mesa_visual,
1758 v->mesa_visual.depthBits > 0,
1759 v->mesa_visual.stencilBits > 0,
1760 v->mesa_visual.accumRedBits > 0,
1761 v->mesa_visual.alphaBits > 0 );
1762
1763 if (!initialize_visual_and_buffer( client, v, b, v->mesa_visual.rgbMode,
1764 (XMesaDrawable)w, b->cmap )) {
1765 free_xmesa_buffer(client, b);
1766 return NULL;
1767 }
1768
1769 #ifdef FX
1770 fxEnvVar = _mesa_getenv("MESA_GLX_FX");
1771 if (fxEnvVar) {
1772 if (fxEnvVar[0]!='d') {
1773 int attribs[100];
1774 int numAttribs = 0;
1775 int hw;
1776 if (v->mesa_visual.depthBits > 0) {
1777 attribs[numAttribs++] = FXMESA_DEPTH_SIZE;
1778 attribs[numAttribs++] = 1;
1779 }
1780 if (v->mesa_visual.doubleBufferMode) {
1781 attribs[numAttribs++] = FXMESA_DOUBLEBUFFER;
1782 }
1783 if (v->mesa_visual.accumRedBits > 0) {
1784 attribs[numAttribs++] = FXMESA_ACCUM_SIZE;
1785 attribs[numAttribs++] = v->mesa_visual.accumRedBits;
1786 }
1787 if (v->mesa_visual.stencilBits > 0) {
1788 attribs[numAttribs++] = FXMESA_STENCIL_SIZE;
1789 attribs[numAttribs++] = v->mesa_visual.stencilBits;
1790 }
1791 if (v->mesa_visual.alphaBits > 0) {
1792 attribs[numAttribs++] = FXMESA_ALPHA_SIZE;
1793 attribs[numAttribs++] = 1;
1794 }
1795 if (1) {
1796 #define FXMESA_SHARE_CONTEXT 990099 /* keep in sync with fxapi.c! */
1797 attribs[numAttribs++] = FXMESA_SHARE_CONTEXT;
1798 attribs[numAttribs++] = (int) &(c->mesa);
1799 }
1800 attribs[numAttribs++] = FXMESA_NONE;
1801
1802 if ((hw = fxQueryHardware())==GR_SSTTYPE_VOODOO) {
1803 b->FXctx = fxMesaCreateBestContext(0, b->width, b->height, attribs);
1804 if ((v->undithered_pf!=PF_Index) && (b->backimage)) {
1805 b->FXisHackUsable = b->FXctx ? GL_TRUE : GL_FALSE;
1806 if (fxEnvVar[0]=='w' || fxEnvVar[0]=='W')
1807 b->FXwindowHack = b->FXctx ? GL_TRUE : GL_FALSE;
1808 else
1809 b->FXwindowHack = GL_FALSE;
1810 }
1811 }
1812 else {
1813 if (fxEnvVar[0]=='w' || fxEnvVar[0]=='W')
1814 b->FXctx = fxMesaCreateContext(w, GR_RESOLUTION_NONE,
1815 GR_REFRESH_75Hz, attribs);
1816 else
1817 b->FXctx = fxMesaCreateBestContext(0, b->width, b->height, attribs);
1818 b->FXisHackUsable = GL_FALSE;
1819 b->FXwindowHack = GL_FALSE;
1820 }
1821 /*
1822 fprintf(stderr,
1823 "voodoo %d, wid %d height %d hack: usable %d active %d\n",
1824 hw, b->width, b->height, b->FXisHackUsable, b->FXwindowHack);
1825 */
1826 }
1827 }
1828 else {
1829 _mesa_warning(NULL, "WARNING: This Mesa Library includes the Glide driver but\n");
1830 _mesa_warning(NULL, " you have not defined the MESA_GLX_FX env. var.\n");
1831 _mesa_warning(NULL, " (check the README.3DFX file for more information).\n\n");
1832 _mesa_warning(NULL, " you can disable this message with a 'export MESA_GLX_FX=disable'.\n");
1833 }
1834 #endif
1835
1836 return b;
1837 }
1838
1839
1840 XMesaBuffer XMesaCreateWindowBuffer( XMesaVisual v, XMesaWindow w )
1841 {
1842 return XMesaCreateWindowBuffer2( v, w, NULL );
1843 }
1844
1845
1846 /*
1847 * Create a new XMesaBuffer from an X pixmap.
1848 * Input: v - the XMesaVisual
1849 * p - the pixmap
1850 * cmap - the colormap, may be 0 if using a TrueColor or DirectColor
1851 * visual for the pixmap
1852 * Return: new XMesaBuffer or NULL if error
1853 */
1854 XMesaBuffer XMesaCreatePixmapBuffer( XMesaVisual v,
1855 XMesaPixmap p, XMesaColormap cmap )
1856 {
1857 int client = 0;
1858 XMesaBuffer b = alloc_xmesa_buffer();
1859 if (!b) {
1860 return NULL;
1861 }
1862
1863
1864 #ifdef XFree86Server
1865 client = CLIENT_ID(((XMesaDrawable)p)->id);
1866 #endif
1867
1868 assert(v);
1869
1870 b->xm_visual = v;
1871 b->type = PIXMAP;
1872 b->display = v->display;
1873 b->cmap = cmap;
1874
1875 /* determine back buffer implementation */
1876 if (v->mesa_visual.doubleBufferMode) {
1877 if (v->ximage_flag) {
1878 b->db_state = BACK_XIMAGE;
1879 }
1880 else {
1881 b->db_state = BACK_PIXMAP;
1882 }
1883 }
1884 else {
1885 b->db_state = 0;
1886 }
1887
1888 _mesa_initialize_framebuffer(&b->mesa_buffer,
1889 &v->mesa_visual,
1890 v->mesa_visual.depthBits > 0,
1891 v->mesa_visual.stencilBits > 0,
1892 v->mesa_visual.accumRedBits +
1893 v->mesa_visual.accumGreenBits +
1894 v->mesa_visual.accumBlueBits > 0,
1895 v->mesa_visual.alphaBits > 0 );
1896
1897 if (!initialize_visual_and_buffer(client, v, b, v->mesa_visual.rgbMode,
1898 (XMesaDrawable)p, cmap)) {
1899 free_xmesa_buffer(client, b);
1900 return NULL;
1901 }
1902
1903 return b;
1904 }
1905
1906
1907
1908 XMesaBuffer XMesaCreatePBuffer( XMesaVisual v, XMesaColormap cmap,
1909 unsigned int width, unsigned int height )
1910 {
1911 #ifdef XFree86Server
1912 return 0;
1913 #else
1914 int client = 0;
1915 XMesaWindow root;
1916 XMesaDrawable drawable; /* X Pixmap Drawable */
1917 XMesaBuffer b = alloc_xmesa_buffer();
1918 if (!b) {
1919 return NULL;
1920 }
1921
1922 b->xm_visual = v;
1923 b->type = PBUFFER;
1924 b->display = v->display;
1925 b->cmap = cmap;
1926
1927 /* allocate pixmap for front buffer */
1928 root = RootWindow( v->display, v->visinfo->screen );
1929 drawable = XCreatePixmap( v->display, root, width, height, v->visinfo->depth );
1930
1931 /* determine back buffer implementation */
1932 if (v->mesa_visual.doubleBufferMode) {
1933 if (v->ximage_flag) {
1934 b->db_state = BACK_XIMAGE;
1935 }
1936 else {
1937 b->db_state = BACK_PIXMAP;
1938 }
1939 }
1940 else {
1941 b->db_state = 0;
1942 }
1943
1944 _mesa_initialize_framebuffer(&b->mesa_buffer,
1945 &v->mesa_visual,
1946 v->mesa_visual.depthBits > 0,
1947 v->mesa_visual.stencilBits > 0,
1948 v->mesa_visual.accumRedBits +
1949 v->mesa_visual.accumGreenBits +
1950 v->mesa_visual.accumBlueBits > 0,
1951 v->mesa_visual.alphaBits > 0 );
1952
1953 if (!initialize_visual_and_buffer(client, v, b, v->mesa_visual.rgbMode,
1954 drawable, cmap)) {
1955 free_xmesa_buffer(client, b);
1956 return NULL;
1957 }
1958
1959 return b;
1960 #endif
1961 }
1962
1963
1964
1965 /*
1966 * Deallocate an XMesaBuffer structure and all related info.
1967 */
1968 void XMesaDestroyBuffer( XMesaBuffer b )
1969 {
1970 int client = 0;
1971
1972 #ifdef XFree86Server
1973 if (b->frontbuffer)
1974 client = CLIENT_ID(b->frontbuffer->id);
1975 #endif
1976
1977 if (b->gc) XMesaFreeGC( b->xm_visual->display, b->gc );
1978 if (b->cleargc) XMesaFreeGC( b->xm_visual->display, b->cleargc );
1979 if (b->swapgc) XMesaFreeGC( b->xm_visual->display, b->swapgc );
1980
1981 if (b->backimage) {
1982 #if defined(USE_XSHM) && !defined(XFree86Server)
1983 if (b->shm) {
1984 XShmDetach( b->xm_visual->display, &b->shminfo );
1985 XDestroyImage( b->backimage );
1986 shmdt( b->shminfo.shmaddr );
1987 }
1988 else
1989 #endif
1990 XMesaDestroyImage( b->backimage );
1991 }
1992 if (b->backpixmap) {
1993 XMesaFreePixmap( b->xm_visual->display, b->backpixmap );
1994 if (b->xm_visual->hpcr_clear_flag) {
1995 XMesaFreePixmap( b->xm_visual->display,
1996 b->xm_visual->hpcr_clear_pixmap );
1997 XMesaDestroyImage( b->xm_visual->hpcr_clear_ximage );
1998 }
1999 }
2000 if (b->rowimage) {
2001 FREE( b->rowimage->data );
2002 b->rowimage->data = NULL;
2003 XMesaDestroyImage( b->rowimage );
2004 }
2005
2006 free_xmesa_buffer(client, b);
2007 }
2008
2009
2010
2011 /*
2012 * Bind buffer b to context c and make c the current rendering context.
2013 */
2014 GLboolean XMesaMakeCurrent( XMesaContext c, XMesaBuffer b )
2015 {
2016 return XMesaMakeCurrent2( c, b, b );
2017 }
2018
2019
2020 /*
2021 * Bind buffer b to context c and make c the current rendering context.
2022 */
2023 GLboolean XMesaMakeCurrent2( XMesaContext c, XMesaBuffer drawBuffer,
2024 XMesaBuffer readBuffer )
2025 {
2026 if (c) {
2027 if (!drawBuffer || !readBuffer)
2028 return GL_FALSE; /* must specify buffers! */
2029
2030 #ifdef FX
2031 if (drawBuffer->FXctx) {
2032 fxMesaMakeCurrent(drawBuffer->FXctx);
2033
2034 c->xm_draw_buffer = drawBuffer;
2035 c->xm_read_buffer = readBuffer;
2036 c->xm_buffer = drawBuffer;
2037
2038 return GL_TRUE;
2039 }
2040 #endif
2041 if (&(c->mesa) == _mesa_get_current_context()
2042 && c->xm_draw_buffer == drawBuffer
2043 && c->xm_read_buffer == readBuffer
2044 && c->xm_draw_buffer->wasCurrent) {
2045 /* same context and buffer, do nothing */
2046 return GL_TRUE;
2047 }
2048
2049 c->xm_draw_buffer = drawBuffer;
2050 c->xm_read_buffer = readBuffer;
2051 c->xm_buffer = drawBuffer;
2052
2053 _mesa_make_current2(&(c->mesa),
2054 &drawBuffer->mesa_buffer,
2055 &readBuffer->mesa_buffer);
2056
2057 if (c->mesa.Viewport.Width == 0) {
2058 /* initialize viewport to window size */
2059 _mesa_Viewport( 0, 0, drawBuffer->width, drawBuffer->height );
2060 c->mesa.Scissor.Width = drawBuffer->width;
2061 c->mesa.Scissor.Height = drawBuffer->height;
2062 }
2063
2064 if (c->xm_visual->mesa_visual.rgbMode) {
2065 /*
2066 * Must recompute and set these pixel values because colormap
2067 * can be different for different windows.
2068 */
2069 c->clearpixel = xmesa_color_to_pixel( c,
2070 c->clearcolor[0],
2071 c->clearcolor[1],
2072 c->clearcolor[2],
2073 c->clearcolor[3],
2074 c->xm_visual->undithered_pf);
2075 XMesaSetForeground(c->display, c->xm_draw_buffer->cleargc, c->clearpixel);
2076 }
2077
2078 /* Solution to Stephane Rehel's problem with glXReleaseBuffersMESA(): */
2079 c->xm_draw_buffer->wasCurrent = GL_TRUE;
2080 }
2081 else {
2082 /* Detach */
2083 _mesa_make_current2( NULL, NULL, NULL );
2084 }
2085 return GL_TRUE;
2086 }
2087
2088
2089 /*
2090 * Unbind the context c from its buffer.
2091 */
2092 GLboolean XMesaUnbindContext( XMesaContext c )
2093 {
2094 /* A no-op for XFree86 integration purposes */
2095 return GL_TRUE;
2096 }
2097
2098
2099 XMesaContext XMesaGetCurrentContext( void )
2100 {
2101 GET_CURRENT_CONTEXT(ctx);
2102 if (ctx) {
2103 XMesaContext xmesa = XMESA_CONTEXT(ctx);
2104 return xmesa;
2105 }
2106 else {
2107 return 0;
2108 }
2109 }
2110
2111
2112 XMesaBuffer XMesaGetCurrentBuffer( void )
2113 {
2114 GET_CURRENT_CONTEXT(ctx);
2115 if (ctx) {
2116 XMesaContext xmesa = XMESA_CONTEXT(ctx);
2117 return xmesa->xm_draw_buffer;
2118 }
2119 else {
2120 return 0;
2121 }
2122 }
2123
2124
2125 /* New in Mesa 3.1 */
2126 XMesaBuffer XMesaGetCurrentReadBuffer( void )
2127 {
2128 GET_CURRENT_CONTEXT(ctx);
2129 if (ctx) {
2130 XMesaContext xmesa = XMESA_CONTEXT(ctx);
2131 return xmesa->xm_read_buffer;
2132 }
2133 else {
2134 return 0;
2135 }
2136 }
2137
2138
2139 GLboolean XMesaForceCurrent(XMesaContext c)
2140 {
2141 if (c) {
2142 if (&(c->mesa) != _mesa_get_current_context()) {
2143 _mesa_make_current(&(c->mesa), &c->xm_draw_buffer->mesa_buffer);
2144 }
2145 }
2146 else {
2147 _mesa_make_current(NULL, NULL);
2148 }
2149 return GL_TRUE;
2150 }
2151
2152
2153 GLboolean XMesaLoseCurrent(XMesaContext c)
2154 {
2155 (void) c;
2156 _mesa_make_current(NULL, NULL);
2157 return GL_TRUE;
2158 }
2159
2160
2161 /*
2162 * Switch 3Dfx support hack between window and full-screen mode.
2163 */
2164 GLboolean XMesaSetFXmode( GLint mode )
2165 {
2166 #ifdef FX
2167 const char *fx = _mesa_getenv("MESA_GLX_FX");
2168 if (fx && fx[0] != 'd') {
2169 GET_CURRENT_CONTEXT(ctx);
2170 GrHwConfiguration hw;
2171 if (!FX_grSstQueryHardware(&hw)) {
2172 /*fprintf(stderr, "!grSstQueryHardware\n");*/
2173 return GL_FALSE;
2174 }
2175 if (hw.num_sst < 1) {
2176 /*fprintf(stderr, "hw.num_sst < 1\n");*/
2177 return GL_FALSE;
2178 }
2179 if (ctx) {
2180 XMesaContext xmesa = XMESA_CONTEXT(ctx);
2181 if (mode == XMESA_FX_WINDOW) {
2182 if (xmesa->xm_draw_buffer->FXisHackUsable) {
2183 FX_grSstControl(GR_CONTROL_DEACTIVATE);
2184 xmesa->xm_draw_buffer->FXwindowHack = GL_TRUE;
2185 return GL_TRUE;
2186 }
2187 }
2188 else if (mode == XMESA_FX_FULLSCREEN) {
2189 FX_grSstControl(GR_CONTROL_ACTIVATE);
2190 xmesa->xm_draw_buffer->FXwindowHack = GL_FALSE;
2191 return GL_TRUE;
2192 }
2193 else {
2194 /* Error: Bad mode value */
2195 }
2196 }
2197 }
2198 /*fprintf(stderr, "fallthrough\n");*/
2199 #else
2200 (void) mode;
2201 #endif
2202 return GL_FALSE;
2203 }
2204
2205
2206
2207 #ifdef FX
2208 /*
2209 * Read image from VooDoo frame buffer into X/Mesa's back XImage.
2210 */
2211 static void FXgetImage( XMesaBuffer b )
2212 {
2213 GET_CURRENT_CONTEXT(ctx);
2214 static unsigned short pixbuf[MAX_WIDTH];
2215 GLuint x, y;
2216 int xpos, ypos;
2217 XMesaWindow root;
2218 unsigned int bw, depth, width, height;
2219 XMesaContext xmesa = XMESA_CONTEXT(ctx);
2220
2221 #ifdef XFree86Server
2222 x = b->frontbuffer->x;
2223 y = b->frontbuffer->y;
2224 width = b->frontbuffer->width;
2225 height = b->frontbuffer->height;
2226 depth = b->frontbuffer->depth;
2227 #else
2228 XGetGeometry( b->xm_visual->display, b->frontbuffer,
2229 &root, &xpos, &ypos, &width, &height, &bw, &depth);
2230 #endif
2231 if (b->width != width || b->height != height) {
2232 b->width = MIN2((int)width, b->FXctx->width);
2233 b->height = MIN2((int)height, b->FXctx->height);
2234 if (b->width & 1)
2235 b->width--; /* prevent odd width */
2236 xmesa_alloc_back_buffer( b );
2237 }
2238
2239 grLfbWriteColorFormat(GR_COLORFORMAT_ARGB);
2240 if (b->xm_visual->undithered_pf==PF_5R6G5B) {
2241 /* Special case: 16bpp RGB */
2242 grLfbReadRegion( GR_BUFFER_FRONTBUFFER, /* src buffer */
2243 0, b->FXctx->height - b->height, /*pos*/
2244 b->width, b->height, /* size */
2245 b->width * sizeof(GLushort), /* stride */
2246 b->backimage->data); /* dest buffer */
2247 }
2248 else if (b->xm_visual->dithered_pf==PF_Dither
2249 && GET_VISUAL_DEPTH(b->xm_visual)==8) {
2250 /* Special case: 8bpp RGB */
2251 for (y=0;y<b->height;y++) {
2252 GLubyte *ptr = (GLubyte*) b->backimage->data
2253 + b->backimage->bytes_per_line * y;
2254 XDITHER_SETUP(y);
2255
2256 /* read row from 3Dfx frame buffer */
2257 grLfbReadRegion( GR_BUFFER_FRONTBUFFER,
2258 0, b->FXctx->height-(b->height-y),
2259 b->width, 1,
2260 0,
2261 pixbuf );
2262
2263 /* write to XImage back buffer */
2264 for (x=0;x<b->width;x++) {
2265 GLubyte r = (pixbuf[x] & 0xf800) >> 8;
2266 GLubyte g = (pixbuf[x] & 0x07e0) >> 3;
2267 GLubyte b = (pixbuf[x] & 0x001f) << 3;
2268 *ptr++ = XDITHER( x, r, g, b);
2269 }
2270 }
2271 }
2272 else {
2273 /* General case: slow! */
2274 for (y=0;y<b->height;y++) {
2275 /* read row from 3Dfx frame buffer */
2276 grLfbReadRegion( GR_BUFFER_FRONTBUFFER,
2277 0, b->FXctx->height-(b->height-y),
2278 b->width, 1,
2279 0,
2280 pixbuf );
2281
2282 /* write to XImage back buffer */
2283 for (x=0;x<b->width;x++) {
2284 XMesaPutPixel(b->backimage,x,y,
2285 xmesa_color_to_pixel(xmesa,
2286 (pixbuf[x] & 0xf800) >> 8,
2287 (pixbuf[x] & 0x07e0) >> 3,
2288 (pixbuf[x] & 0x001f) << 3,
2289 0xff,
2290 b->xm_visual->undithered_pf));
2291 }
2292 }
2293 }
2294 grLfbWriteColorFormat(GR_COLORFORMAT_ABGR);
2295 }
2296 #endif
2297
2298
2299 /*
2300 * Copy the back buffer to the front buffer. If there's no back buffer
2301 * this is a no-op.
2302 */
2303 void XMesaSwapBuffers( XMesaBuffer b )
2304 {
2305 GET_CURRENT_CONTEXT(ctx);
2306
2307 /* If we're swapping the buffer associated with the current context
2308 * we have to flush any pending rendering commands first.
2309 */
2310 if (ctx && ctx->DrawBuffer == &(b->mesa_buffer))
2311 _mesa_notifySwapBuffers(ctx);
2312
2313 if (b->db_state) {
2314 #ifdef FX
2315 if (b->FXctx) {
2316 fxMesaSwapBuffers();
2317
2318 if (b->FXwindowHack)
2319 FXgetImage(b);
2320 else
2321 return;
2322 }
2323 #endif
2324 if (b->backimage) {
2325 /* Copy Ximage from host's memory to server's window */
2326 #if defined(USE_XSHM) && !defined(XFree86Server)
2327 if (b->shm) {
2328 /*_glthread_LOCK_MUTEX(_xmesa_lock);*/
2329 XShmPutImage( b->xm_visual->display, b->frontbuffer,
2330 b->swapgc,
2331 b->backimage, 0, 0,
2332 0, 0, b->width, b->height, False );
2333 /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/
2334 }
2335 else
2336 #endif
2337 {
2338 /*_glthread_LOCK_MUTEX(_xmesa_lock);*/
2339 XMesaPutImage( b->xm_visual->display, b->frontbuffer,
2340 b->swapgc,
2341 b->backimage, 0, 0,
2342 0, 0, b->width, b->height );
2343 /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/
2344 }
2345 }
2346 else {
2347 /* Copy pixmap to window on server */
2348 /*_glthread_LOCK_MUTEX(_xmesa_lock);*/
2349 XMesaCopyArea( b->xm_visual->display,
2350 b->backpixmap, /* source drawable */
2351 b->frontbuffer, /* dest. drawable */
2352 b->swapgc,
2353 0, 0, b->width, b->height, /* source region */
2354 0, 0 /* dest region */
2355 );
2356 /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/
2357 }
2358 }
2359 #if !defined(XFree86Server)
2360 XSync( b->xm_visual->display, False );
2361 #endif
2362 }
2363
2364
2365
2366 /*
2367 * Copy sub-region of back buffer to front buffer
2368 */
2369 void XMesaCopySubBuffer( XMesaBuffer b, int x, int y, int width, int height )
2370 {
2371 GET_CURRENT_CONTEXT(ctx);
2372
2373 /* If we're swapping the buffer associated with the current context
2374 * we have to flush any pending rendering commands first.
2375 */
2376 if (ctx && ctx->DrawBuffer == &(b->mesa_buffer))
2377 _mesa_notifySwapBuffers(ctx);
2378
2379 if (b->db_state) {
2380 int yTop = b->height - y - height;
2381 #ifdef FX
2382 if (b->FXctx) {
2383 fxMesaSwapBuffers();
2384 if (b->FXwindowHack)
2385 FXgetImage(b);
2386 else
2387 return;
2388 }
2389 #endif
2390 if (b->backimage) {
2391 /* Copy Ximage from host's memory to server's window */
2392 #if defined(USE_XSHM) && !defined(XFree86Server)
2393 if (b->shm) {
2394 /* XXX assuming width and height aren't too large! */
2395 XShmPutImage( b->xm_visual->display, b->frontbuffer,
2396 b->swapgc,
2397 b->backimage, x, yTop,
2398 x, yTop, width, height, False );
2399 /* wait for finished event??? */
2400 }
2401 else
2402 #endif
2403 {
2404 /* XXX assuming width and height aren't too large! */
2405 XMesaPutImage( b->xm_visual->display, b->frontbuffer,
2406 b->swapgc,
2407 b->backimage, x, yTop,
2408 x, yTop, width, height );
2409 }
2410 }
2411 else {
2412 /* Copy pixmap to window on server */
2413 XMesaCopyArea( b->xm_visual->display,
2414 b->backpixmap, /* source drawable */
2415 b->frontbuffer, /* dest. drawable */
2416 b->swapgc,
2417 x, yTop, width, height, /* source region */
2418 x, yTop /* dest region */
2419 );
2420 }
2421 }
2422 }
2423
2424
2425 /*
2426 * Return a pointer to the XMesa backbuffer Pixmap or XImage. This function
2427 * is a way to get "under the hood" of X/Mesa so one can manipulate the
2428 * back buffer directly.
2429 * Output: pixmap - pointer to back buffer's Pixmap, or 0
2430 * ximage - pointer to back buffer's XImage, or NULL
2431 * Return: GL_TRUE = context is double buffered
2432 * GL_FALSE = context is single buffered
2433 */
2434 GLboolean XMesaGetBackBuffer( XMesaBuffer b,
2435 XMesaPixmap *pixmap,
2436 XMesaImage **ximage )
2437 {
2438 if (b->db_state) {
2439 if (pixmap) *pixmap = b->backpixmap;
2440 if (ximage) *ximage = b->backimage;
2441 return GL_TRUE;
2442 }
2443 else {
2444 *pixmap = 0;
2445 *ximage = NULL;
2446 return GL_FALSE;
2447 }
2448 }
2449
2450
2451 /*
2452 * Return the depth buffer associated with an XMesaBuffer.
2453 * Input: b - the XMesa buffer handle
2454 * Output: width, height - size of buffer in pixels
2455 * bytesPerValue - bytes per depth value (2 or 4)
2456 * buffer - pointer to depth buffer values
2457 * Return: GL_TRUE or GL_FALSE to indicate success or failure.
2458 */
2459 GLboolean XMesaGetDepthBuffer( XMesaBuffer b, GLint *width, GLint *height,
2460 GLint *bytesPerValue, void **buffer )
2461 {
2462 if (!b->mesa_buffer.DepthBuffer) {
2463 *width = 0;
2464 *height = 0;
2465 *bytesPerValue = 0;
2466 *buffer = 0;
2467 return GL_FALSE;
2468 }
2469 else {
2470 *width = b->mesa_buffer.Width;
2471 *height = b->mesa_buffer.Height;
2472 *bytesPerValue = sizeof(GLdepth);
2473 *buffer = b->mesa_buffer.DepthBuffer;
2474 return GL_TRUE;
2475 }
2476 }
2477
2478
2479 void XMesaFlush( XMesaContext c )
2480 {
2481 if (c && c->xm_visual) {
2482 #ifdef XFree86Server
2483 /* NOT_NEEDED */
2484 #else
2485 XSync( c->xm_visual->display, False );
2486 #endif
2487 }
2488 }
2489
2490
2491
2492 const char *XMesaGetString( XMesaContext c, int name )
2493 {
2494 (void) c;
2495 if (name==XMESA_VERSION) {
2496 return "5.0";
2497 }
2498 else if (name==XMESA_EXTENSIONS) {
2499 return "";
2500 }
2501 else {
2502 return NULL;
2503 }
2504 }
2505
2506
2507
2508 XMesaBuffer XMesaFindBuffer( XMesaDisplay *dpy, XMesaDrawable d )
2509 {
2510 XMesaBuffer b;
2511 for (b=XMesaBufferList; b; b=b->Next) {
2512 if (b->frontbuffer==d && b->display==dpy) {
2513 return b;
2514 }
2515 }
2516 return NULL;
2517 }
2518
2519
2520
2521 /*
2522 * Look for XMesaBuffers whose X window has been destroyed.
2523 * Deallocate any such XMesaBuffers.
2524 */
2525 void XMesaGarbageCollect( void )
2526 {
2527 XMesaBuffer b, next;
2528 for (b=XMesaBufferList; b; b=next) {
2529 next = b->Next;
2530 if (b->display && b->frontbuffer && b->type == WINDOW) {
2531 #ifdef XFree86Server
2532 /* NOT_NEEDED */
2533 #else
2534 XSync(b->display, False);
2535 if (!window_exists( b->display, b->frontbuffer )) {
2536 /* found a dead window, free the ancillary info */
2537 XMesaDestroyBuffer( b );
2538 }
2539 #endif
2540 }
2541 }
2542 }
2543
2544
2545 void XMesaReset( void )
2546 {
2547 while (XMesaBufferList)
2548 XMesaDestroyBuffer(XMesaBufferList);
2549
2550 XMesaBufferList = NULL;
2551 }
2552
2553
2554 unsigned long XMesaDitherColor( XMesaContext xmesa, GLint x, GLint y,
2555 GLfloat red, GLfloat green,
2556 GLfloat blue, GLfloat alpha )
2557 {
2558 GLint r = (GLint) (red * 255.0F);
2559 GLint g = (GLint) (green * 255.0F);
2560 GLint b = (GLint) (blue * 255.0F);
2561 GLint a = (GLint) (alpha * 255.0F);
2562
2563 switch (xmesa->pixelformat) {
2564 case PF_Index:
2565 return 0;
2566 case PF_Truecolor:
2567 {
2568 unsigned long p;
2569 PACK_TRUECOLOR( p, r, g, b );
2570 return p;
2571 }
2572 case PF_8A8B8G8R:
2573 return PACK_8A8B8G8R( r, g, b, a );
2574 case PF_8R8G8B:
2575 return PACK_8R8G8B( r, g, b );
2576 case PF_5R6G5B:
2577 return PACK_5R6G5B( r, g, b );
2578 case PF_Dither:
2579 {
2580 DITHER_SETUP;
2581 return DITHER( x, y, r, g, b );
2582 }
2583 case PF_1Bit:
2584 /* 382 = (3*255)/2 */
2585 return ((r+g+b) > 382) ^ xmesa->xm_visual->bitFlip;
2586 case PF_HPCR:
2587 return DITHER_HPCR(x, y, r, g, b);
2588 case PF_Lookup:
2589 {
2590 LOOKUP_SETUP;
2591 return LOOKUP( r, g, b );
2592 }
2593 case PF_Grayscale:
2594 return GRAY_RGB( r, g, b );
2595 case PF_Dither_5R6G5B:
2596 /* fall through */
2597 case PF_Dither_True:
2598 {
2599 unsigned long p;
2600 PACK_TRUEDITHER(p, x, y, r, g, b);
2601 return p;
2602 }
2603 default:
2604 _mesa_problem(NULL, "Bad pixel format in XMesaDitherColor");
2605 }
2606 return 0;
2607 }
2608
2609
2610 /*
2611 * This is typically called when the window size changes and we need
2612 * to reallocate the buffer's back/depth/stencil/accum buffers.
2613 */
2614 void XMesaResizeBuffers( XMesaBuffer b )
2615 {
2616 xmesa_resize_buffers( &(b->mesa_buffer) );
2617
2618 }
2619