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small cleanup, remove some warnings
[mesa.git] / src / mesa / drivers / x11 / xm_api.c
1 /*
2 * Mesa 3-D graphics library
3 * Version: 6.3
4 *
5 * Copyright (C) 1999-2004 Brian Paul All Rights Reserved.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation
10 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11 * and/or sell copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
21 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
22 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
23 */
24
25 /*
26 * This file contains the implementations of all the XMesa* functions.
27 *
28 *
29 * NOTES:
30 *
31 * The window coordinate system origin (0,0) is in the lower-left corner
32 * of the window. X11's window coordinate origin is in the upper-left
33 * corner of the window. Therefore, most drawing functions in this
34 * file have to flip Y coordinates.
35 *
36 * Define USE_XSHM in the Makefile with -DUSE_XSHM if you want to compile
37 * in support for the MIT Shared Memory extension. If enabled, when you
38 * use an Ximage for the back buffer in double buffered mode, the "swap"
39 * operation will be faster. You must also link with -lXext.
40 *
41 * Byte swapping: If the Mesa host and the X display use a different
42 * byte order then there's some trickiness to be aware of when using
43 * XImages. The byte ordering used for the XImage is that of the X
44 * display, not the Mesa host.
45 * The color-to-pixel encoding for True/DirectColor must be done
46 * according to the display's visual red_mask, green_mask, and blue_mask.
47 * If XPutPixel is used to put a pixel into an XImage then XPutPixel will
48 * do byte swapping if needed. If one wants to directly "poke" the pixel
49 * into the XImage's buffer then the pixel must be byte swapped first. In
50 * Mesa, when byte swapping is needed we use the PF_TRUECOLOR pixel format
51 * and use XPutPixel everywhere except in the implementation of
52 * glClear(GL_COLOR_BUFFER_BIT). We want this function to be fast so
53 * instead of using XPutPixel we "poke" our values after byte-swapping
54 * the clear pixel value if needed.
55 *
56 */
57
58 #ifdef __CYGWIN__
59 #undef WIN32
60 #undef __WIN32__
61 #endif
62
63 #include "glxheader.h"
64 #include "GL/xmesa.h"
65 #include "xmesaP.h"
66 #include "context.h"
67 #include "extensions.h"
68 #include "glthread.h"
69 #include "imports.h"
70 #include "matrix.h"
71 #include "mtypes.h"
72 #include "macros.h"
73 #include "texformat.h"
74 #include "texobj.h"
75 #include "texstore.h"
76 #include "swrast/swrast.h"
77 #include "swrast_setup/swrast_setup.h"
78 #include "array_cache/acache.h"
79 #include "tnl/tnl.h"
80 #include "tnl/t_context.h"
81 #include "tnl/t_pipeline.h"
82 #include "drivers/common/driverfuncs.h"
83
84 #ifdef XFree86Server
85 #include <GL/glxtokens.h>
86 #endif
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 volatile 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 * Apply gamma correction to an intensity value in [0..max]. Return the
225 * new intensity value.
226 */
227 static GLint gamma_adjust( GLfloat gamma, GLint value, GLint max )
228 {
229 if (gamma == 1.0) {
230 return value;
231 }
232 else {
233 double x = (double) value / (double) max;
234 return IROUND_POS((GLfloat) max * _mesa_pow(x, 1.0F/gamma));
235 }
236 }
237
238
239
240 /*
241 * Return the true number of bits per pixel for XImages.
242 * For example, if we request a 24-bit deep visual we may actually need/get
243 * 32bpp XImages. This function returns the appropriate bpp.
244 * Input: dpy - the X display
245 * visinfo - desribes the visual to be used for XImages
246 * Return: true number of bits per pixel for XImages
247 */
248 #ifdef XFree86Server
249
250 static int bits_per_pixel( XMesaVisual xmv )
251 {
252 const int depth = xmv->nplanes;
253 int i;
254 for (i = 0; i < screenInfo.numPixmapFormats; i++) {
255 if (screenInfo.formats[i].depth == depth)
256 return screenInfo.formats[i].bitsPerPixel;
257 }
258 return depth; /* should never get here, but this should be safe */
259 }
260
261 #else
262
263 static int bits_per_pixel( XMesaVisual xmv )
264 {
265 XMesaDisplay *dpy = xmv->display;
266 XMesaVisualInfo visinfo = xmv->visinfo;
267 XMesaImage *img;
268 int bitsPerPixel;
269 /* Create a temporary XImage */
270 img = XCreateImage( dpy, visinfo->visual, visinfo->depth,
271 ZPixmap, 0, /*format, offset*/
272 (char*) MALLOC(8), /*data*/
273 1, 1, /*width, height*/
274 32, /*bitmap_pad*/
275 0 /*bytes_per_line*/
276 );
277 assert(img);
278 /* grab the bits/pixel value */
279 bitsPerPixel = img->bits_per_pixel;
280 /* free the XImage */
281 FREE( img->data );
282 img->data = NULL;
283 XMesaDestroyImage( img );
284 return bitsPerPixel;
285 }
286 #endif
287
288
289
290 /*
291 * Determine if a given X window ID is valid (window exists).
292 * Do this by calling XGetWindowAttributes() for the window and
293 * checking if we catch an X error.
294 * Input: dpy - the display
295 * win - the window to check for existance
296 * Return: GL_TRUE - window exists
297 * GL_FALSE - window doesn't exist
298 */
299 #ifndef XFree86Server
300 static GLboolean WindowExistsFlag;
301
302 static int window_exists_err_handler( XMesaDisplay* dpy, XErrorEvent* xerr )
303 {
304 (void) dpy;
305 if (xerr->error_code == BadWindow) {
306 WindowExistsFlag = GL_FALSE;
307 }
308 return 0;
309 }
310
311 static GLboolean window_exists( XMesaDisplay *dpy, Window win )
312 {
313 XWindowAttributes wa;
314 int (*old_handler)( XMesaDisplay*, XErrorEvent* );
315 WindowExistsFlag = GL_TRUE;
316 old_handler = XSetErrorHandler(window_exists_err_handler);
317 XGetWindowAttributes( dpy, win, &wa ); /* dummy request */
318 XSetErrorHandler(old_handler);
319 return WindowExistsFlag;
320 }
321 #endif
322
323
324
325 /**********************************************************************/
326 /***** Linked list of XMesaBuffers *****/
327 /**********************************************************************/
328
329 static XMesaBuffer XMesaBufferList = NULL;
330
331
332 /* Allocate a new XMesaBuffer, add to linked list */
333 static XMesaBuffer alloc_xmesa_buffer(void)
334 {
335 XMesaBuffer b = (XMesaBuffer) CALLOC_STRUCT(xmesa_buffer);
336 if (b) {
337 b->Next = XMesaBufferList;
338 XMesaBufferList = b;
339 }
340 return b;
341 }
342
343
344 /*
345 * Find an XMesaBuffer by matching X display and colormap but NOT matching
346 * the notThis buffer.
347 */
348 static XMesaBuffer find_xmesa_buffer(XMesaDisplay *dpy,
349 XMesaColormap cmap,
350 XMesaBuffer notThis)
351 {
352 XMesaBuffer b;
353 for (b=XMesaBufferList; b; b=b->Next) {
354 if (b->display==dpy && b->cmap==cmap && b!=notThis) {
355 return b;
356 }
357 }
358 return NULL;
359 }
360
361
362 /*
363 * Free an XMesaBuffer, remove from linked list, perhaps free X colormap
364 * entries.
365 */
366 static void free_xmesa_buffer(int client, XMesaBuffer buffer)
367 {
368 XMesaBuffer prev = NULL, b;
369 (void) client;
370 for (b=XMesaBufferList; b; b=b->Next) {
371 if (b==buffer) {
372 /* unlink bufer from list */
373 if (prev)
374 prev->Next = buffer->Next;
375 else
376 XMesaBufferList = buffer->Next;
377 /* Check to free X colors */
378 if (buffer->num_alloced>0) {
379 /* If no other buffer uses this X colormap then free the colors. */
380 if (!find_xmesa_buffer(buffer->display, buffer->cmap, buffer)) {
381 #ifdef XFree86Server
382 (void)FreeColors(buffer->cmap, client,
383 buffer->num_alloced, buffer->alloced_colors,
384 0);
385 #else
386 XFreeColors(buffer->display, buffer->cmap,
387 buffer->alloced_colors, buffer->num_alloced, 0);
388 #endif
389 }
390 }
391
392 _mesa_free_framebuffer_data(&buffer->mesa_buffer);
393 FREE(buffer);
394
395 return;
396 }
397 /* continue search */
398 prev = b;
399 }
400 /* buffer not found in XMesaBufferList */
401 _mesa_problem(NULL,"free_xmesa_buffer() - buffer not found\n");
402 }
403
404
405 /* Copy X color table stuff from one XMesaBuffer to another. */
406 static void copy_colortable_info(XMesaBuffer dst, const XMesaBuffer src)
407 {
408 MEMCPY(dst->color_table, src->color_table, sizeof(src->color_table));
409 MEMCPY(dst->pixel_to_r, src->pixel_to_r, sizeof(src->pixel_to_r));
410 MEMCPY(dst->pixel_to_g, src->pixel_to_g, sizeof(src->pixel_to_g));
411 MEMCPY(dst->pixel_to_b, src->pixel_to_b, sizeof(src->pixel_to_b));
412 dst->num_alloced = src->num_alloced;
413 MEMCPY(dst->alloced_colors, src->alloced_colors,
414 sizeof(src->alloced_colors));
415 }
416
417
418
419 /**********************************************************************/
420 /***** Misc Private Functions *****/
421 /**********************************************************************/
422
423
424 /*
425 * Return number of bits set in n.
426 */
427 static int bitcount( unsigned long n )
428 {
429 int bits;
430 for (bits=0; n>0; n=n>>1) {
431 if (n&1) {
432 bits++;
433 }
434 }
435 return bits;
436 }
437
438
439
440 /*
441 * Allocate a shared memory XImage back buffer for the given XMesaBuffer.
442 * Return: GL_TRUE if success, GL_FALSE if error
443 */
444 #ifndef XFree86Server
445 static GLboolean alloc_shm_back_buffer( XMesaBuffer b )
446 {
447 #ifdef USE_XSHM
448 /*
449 * We have to do a _lot_ of error checking here to be sure we can
450 * really use the XSHM extension. It seems different servers trigger
451 * errors at different points if the extension won't work. Therefore
452 * we have to be very careful...
453 */
454 GC gc;
455 int (*old_handler)( XMesaDisplay *, XErrorEvent * );
456
457 if (b->mesa_buffer.Width == 0 || b->mesa_buffer.Height == 0) {
458 /* this will be true the first time we're called on 'b' */
459 return GL_FALSE;
460 }
461
462 b->backimage = XShmCreateImage(b->xm_visual->display,
463 b->xm_visual->visinfo->visual,
464 b->xm_visual->visinfo->depth,
465 ZPixmap, NULL, &b->shminfo,
466 b->mesa_buffer.Width, b->mesa_buffer.Height);
467 if (b->backimage == NULL) {
468 _mesa_warning(NULL, "alloc_back_buffer: Shared memory error (XShmCreateImage), disabling.");
469 b->shm = 0;
470 return GL_FALSE;
471 }
472
473 b->shminfo.shmid = shmget( IPC_PRIVATE, b->backimage->bytes_per_line
474 * b->backimage->height, IPC_CREAT|0777 );
475 if (b->shminfo.shmid < 0) {
476 _mesa_warning(NULL, "shmget failed while allocating back buffer");
477 XDestroyImage( b->backimage );
478 b->backimage = NULL;
479 _mesa_warning(NULL, "alloc_back_buffer: Shared memory error (shmget), disabling.");
480 b->shm = 0;
481 return GL_FALSE;
482 }
483
484 b->shminfo.shmaddr = b->backimage->data
485 = (char*)shmat( b->shminfo.shmid, 0, 0 );
486 if (b->shminfo.shmaddr == (char *) -1) {
487 _mesa_warning(NULL, "shmat() failed while allocating back buffer");
488 XDestroyImage( b->backimage );
489 shmctl( b->shminfo.shmid, IPC_RMID, 0 );
490 b->backimage = NULL;
491 _mesa_warning(NULL, "alloc_back_buffer: Shared memory error (shmat), disabling.");
492 b->shm = 0;
493 return GL_FALSE;
494 }
495
496 b->shminfo.readOnly = False;
497 mesaXErrorFlag = 0;
498 old_handler = XSetErrorHandler( mesaHandleXError );
499 /* This may trigger the X protocol error we're ready to catch: */
500 XShmAttach( b->xm_visual->display, &b->shminfo );
501 XSync( b->xm_visual->display, False );
502
503 if (mesaXErrorFlag) {
504 /* we are on a remote display, this error is normal, don't print it */
505 XFlush( b->xm_visual->display );
506 mesaXErrorFlag = 0;
507 XDestroyImage( b->backimage );
508 shmdt( b->shminfo.shmaddr );
509 shmctl( b->shminfo.shmid, IPC_RMID, 0 );
510 b->backimage = NULL;
511 b->shm = 0;
512 (void) XSetErrorHandler( old_handler );
513 return GL_FALSE;
514 }
515
516 shmctl( b->shminfo.shmid, IPC_RMID, 0 ); /* nobody else needs it */
517
518 /* Finally, try an XShmPutImage to be really sure the extension works */
519 gc = XCreateGC( b->xm_visual->display, b->frontbuffer, 0, NULL );
520 XShmPutImage( b->xm_visual->display, b->frontbuffer, gc,
521 b->backimage, 0, 0, 0, 0, 1, 1 /*one pixel*/, False );
522 XSync( b->xm_visual->display, False );
523 XFreeGC( b->xm_visual->display, gc );
524 (void) XSetErrorHandler( old_handler );
525 if (mesaXErrorFlag) {
526 XFlush( b->xm_visual->display );
527 mesaXErrorFlag = 0;
528 XDestroyImage( b->backimage );
529 shmdt( b->shminfo.shmaddr );
530 shmctl( b->shminfo.shmid, IPC_RMID, 0 );
531 b->backimage = NULL;
532 b->shm = 0;
533 return GL_FALSE;
534 }
535
536 if (b->backimage) {
537 int height = b->backimage->height;
538 /* Needed by PIXELADDR1 macro */
539 b->ximage_width1 = b->backimage->bytes_per_line;
540 b->ximage_origin1 = (GLubyte *) b->backimage->data
541 + b->ximage_width1 * (height-1);
542 /* Needed by PIXELADDR2 macro */
543 b->ximage_width2 = b->backimage->bytes_per_line / 2;
544 b->ximage_origin2 = (GLushort *) b->backimage->data
545 + b->ximage_width2 * (height-1);
546 /* Needed by PIXELADDR3 macro */
547 b->ximage_width3 = b->backimage->bytes_per_line;
548 b->ximage_origin3 = (GLubyte *) b->backimage->data
549 + b->ximage_width3 * (height-1);
550 /* Needed by PIXELADDR4 macro */
551 b->ximage_width4 = b->backimage->width;
552 b->ximage_origin4 = (GLuint *) b->backimage->data
553 + b->ximage_width4 * (height-1);
554 }
555
556 return GL_TRUE;
557 #else
558 /* Can't compile XSHM support */
559 return GL_FALSE;
560 #endif
561 }
562 #endif
563
564
565
566 /*
567 * Setup an off-screen pixmap or Ximage to use as the back buffer.
568 * Input: b - the X/Mesa buffer
569 */
570 void xmesa_alloc_back_buffer( XMesaBuffer b )
571 {
572 if (b->db_state==BACK_XIMAGE) {
573 /* Deallocate the old backimage, if any */
574 if (b->backimage) {
575 #if defined(USE_XSHM) && !defined(XFree86Server)
576 if (b->shm) {
577 XShmDetach( b->xm_visual->display, &b->shminfo );
578 XDestroyImage( b->backimage );
579 shmdt( b->shminfo.shmaddr );
580 }
581 else
582 #endif
583 XMesaDestroyImage( b->backimage );
584 b->backimage = NULL;
585 }
586
587 /* Allocate new back buffer */
588 #ifdef XFree86Server
589 {
590 /* Allocate a regular XImage for the back buffer. */
591 b->backimage = XMesaCreateImage(b->xm_visual->BitsPerPixel,
592 b->mesa_buffer.Width,
593 b->mesa_buffer.Height, NULL);
594 #else
595 if (b->shm==0 || alloc_shm_back_buffer(b)==GL_FALSE) {
596 /* Allocate a regular XImage for the back buffer. */
597 b->backimage = XCreateImage( b->xm_visual->display,
598 b->xm_visual->visinfo->visual,
599 GET_VISUAL_DEPTH(b->xm_visual),
600 ZPixmap, 0, /* format, offset */
601 NULL,
602 b->mesa_buffer.Width,
603 b->mesa_buffer.Height,
604 8, 0 ); /* pad, bytes_per_line */
605 #endif
606 if (!b->backimage) {
607 _mesa_warning(NULL, "alloc_back_buffer: XCreateImage failed.");
608 }
609 b->backimage->data = (char *) MALLOC( b->backimage->height
610 * b->backimage->bytes_per_line );
611 if (!b->backimage->data) {
612 _mesa_warning(NULL, "alloc_back_buffer: MALLOC failed.");
613 XMesaDestroyImage( b->backimage );
614 b->backimage = NULL;
615 }
616 }
617 b->backpixmap = None;
618 }
619 else if (b->db_state==BACK_PIXMAP) {
620 XMesaPixmap old_pixmap = b->backpixmap;
621 /* Free the old back pixmap */
622 if (b->backpixmap) {
623 XMesaFreePixmap( b->xm_visual->display, b->backpixmap );
624 }
625 /* Allocate new back pixmap */
626 b->backpixmap = XMesaCreatePixmap( b->xm_visual->display, b->frontbuffer,
627 b->mesa_buffer.Width,
628 b->mesa_buffer.Height,
629 GET_VISUAL_DEPTH(b->xm_visual) );
630 b->backimage = NULL;
631 /* update other references to backpixmap */
632 if (b->buffer==(XMesaDrawable)old_pixmap) {
633 b->buffer = (XMesaDrawable)b->backpixmap;
634 }
635 }
636 }
637
638
639
640 /*
641 * A replacement for XAllocColor. This function should never
642 * fail to allocate a color. When XAllocColor fails, we return
643 * the nearest matching color. If we have to allocate many colors
644 * this function isn't too efficient; the XQueryColors() could be
645 * done just once.
646 * Written by Michael Pichler, Brian Paul, Mark Kilgard
647 * Input: dpy - X display
648 * cmap - X colormap
649 * cmapSize - size of colormap
650 * In/Out: color - the XColor struct
651 * Output: exact - 1=exact color match, 0=closest match
652 * alloced - 1=XAlloc worked, 0=XAlloc failed
653 */
654 static void
655 noFaultXAllocColor( int client,
656 XMesaDisplay *dpy,
657 XMesaColormap cmap,
658 int cmapSize,
659 XMesaColor *color,
660 int *exact, int *alloced )
661 {
662 #ifdef XFree86Server
663 Pixel *ppixIn;
664 xrgb *ctable;
665 #else
666 /* we'll try to cache ctable for better remote display performance */
667 static Display *prevDisplay = NULL;
668 static XMesaColormap prevCmap = 0;
669 static int prevCmapSize = 0;
670 static XMesaColor *ctable = NULL;
671 #endif
672 XMesaColor subColor;
673 int i, bestmatch;
674 double mindist; /* 3*2^16^2 exceeds long int precision. */
675
676 (void) client;
677
678 /* First try just using XAllocColor. */
679 #ifdef XFree86Server
680 if (AllocColor(cmap,
681 &color->red, &color->green, &color->blue,
682 &color->pixel,
683 client) == Success) {
684 #else
685 if (XAllocColor(dpy, cmap, color)) {
686 #endif
687 *exact = 1;
688 *alloced = 1;
689 return;
690 }
691
692 /* Alloc failed, search for closest match */
693
694 /* Retrieve color table entries. */
695 /* XXX alloca candidate. */
696 #ifdef XFree86Server
697 ppixIn = (Pixel *) MALLOC(cmapSize * sizeof(Pixel));
698 ctable = (xrgb *) MALLOC(cmapSize * sizeof(xrgb));
699 for (i = 0; i < cmapSize; i++) {
700 ppixIn[i] = i;
701 }
702 QueryColors(cmap, cmapSize, ppixIn, ctable);
703 #else
704 if (prevDisplay != dpy || prevCmap != cmap
705 || prevCmapSize != cmapSize || !ctable) {
706 /* free previously cached color table */
707 if (ctable)
708 FREE(ctable);
709 /* Get the color table from X */
710 ctable = (XMesaColor *) MALLOC(cmapSize * sizeof(XMesaColor));
711 assert(ctable);
712 for (i = 0; i < cmapSize; i++) {
713 ctable[i].pixel = i;
714 }
715 XQueryColors(dpy, cmap, ctable, cmapSize);
716 prevDisplay = dpy;
717 prevCmap = cmap;
718 prevCmapSize = cmapSize;
719 }
720 #endif
721
722 /* Find best match. */
723 bestmatch = -1;
724 mindist = 0.0;
725 for (i = 0; i < cmapSize; i++) {
726 double dr = 0.30 * ((double) color->red - (double) ctable[i].red);
727 double dg = 0.59 * ((double) color->green - (double) ctable[i].green);
728 double db = 0.11 * ((double) color->blue - (double) ctable[i].blue);
729 double dist = dr * dr + dg * dg + db * db;
730 if (bestmatch < 0 || dist < mindist) {
731 bestmatch = i;
732 mindist = dist;
733 }
734 }
735
736 /* Return result. */
737 subColor.red = ctable[bestmatch].red;
738 subColor.green = ctable[bestmatch].green;
739 subColor.blue = ctable[bestmatch].blue;
740 /* Try to allocate the closest match color. This should only
741 * fail if the cell is read/write. Otherwise, we're incrementing
742 * the cell's reference count.
743 */
744 #ifdef XFree86Server
745 if (AllocColor(cmap,
746 &subColor.red, &subColor.green, &subColor.blue,
747 &subColor.pixel,
748 client) == Success) {
749 #else
750 if (XAllocColor(dpy, cmap, &subColor)) {
751 #endif
752 *alloced = 1;
753 }
754 else {
755 /* do this to work around a problem reported by Frank Ortega */
756 subColor.pixel = (unsigned long) bestmatch;
757 subColor.red = ctable[bestmatch].red;
758 subColor.green = ctable[bestmatch].green;
759 subColor.blue = ctable[bestmatch].blue;
760 subColor.flags = DoRed | DoGreen | DoBlue;
761 *alloced = 0;
762 }
763 #ifdef XFree86Server
764 FREE(ppixIn);
765 FREE(ctable);
766 #else
767 /* don't free table, save it for next time */
768 #endif
769
770 *color = subColor;
771 *exact = 0;
772 }
773
774
775
776
777 /*
778 * Do setup for PF_GRAYSCALE pixel format.
779 * Note that buffer may be NULL.
780 */
781 static GLboolean setup_grayscale( int client, XMesaVisual v,
782 XMesaBuffer buffer, XMesaColormap cmap )
783 {
784 if (GET_VISUAL_DEPTH(v)<4 || GET_VISUAL_DEPTH(v)>16) {
785 return GL_FALSE;
786 }
787
788 if (buffer) {
789 XMesaBuffer prevBuffer;
790
791 if (!cmap) {
792 return GL_FALSE;
793 }
794
795 prevBuffer = find_xmesa_buffer(v->display, cmap, buffer);
796 if (prevBuffer &&
797 (buffer->xm_visual->mesa_visual.rgbMode ==
798 prevBuffer->xm_visual->mesa_visual.rgbMode)) {
799 /* Copy colormap stuff from previous XMesaBuffer which uses same
800 * X colormap. Do this to avoid time spent in noFaultXAllocColor.
801 */
802 copy_colortable_info(buffer, prevBuffer);
803 }
804 else {
805 /* Allocate 256 shades of gray */
806 int gray;
807 int colorsfailed = 0;
808 for (gray=0;gray<256;gray++) {
809 GLint r = gamma_adjust( v->RedGamma, gray, 255 );
810 GLint g = gamma_adjust( v->GreenGamma, gray, 255 );
811 GLint b = gamma_adjust( v->BlueGamma, gray, 255 );
812 int exact, alloced;
813 XMesaColor xcol;
814 xcol.red = (r << 8) | r;
815 xcol.green = (g << 8) | g;
816 xcol.blue = (b << 8) | b;
817 noFaultXAllocColor( client, v->display,
818 cmap, GET_COLORMAP_SIZE(v),
819 &xcol, &exact, &alloced );
820 if (!exact) {
821 colorsfailed++;
822 }
823 if (alloced) {
824 assert(buffer->num_alloced<256);
825 buffer->alloced_colors[buffer->num_alloced] = xcol.pixel;
826 buffer->num_alloced++;
827 }
828
829 /*OLD
830 assert(gray < 576);
831 buffer->color_table[gray*3+0] = xcol.pixel;
832 buffer->color_table[gray*3+1] = xcol.pixel;
833 buffer->color_table[gray*3+2] = xcol.pixel;
834 assert(xcol.pixel < 65536);
835 buffer->pixel_to_r[xcol.pixel] = gray * 30 / 100;
836 buffer->pixel_to_g[xcol.pixel] = gray * 59 / 100;
837 buffer->pixel_to_b[xcol.pixel] = gray * 11 / 100;
838 */
839 buffer->color_table[gray] = xcol.pixel;
840 assert(xcol.pixel < 65536);
841 buffer->pixel_to_r[xcol.pixel] = gray;
842 buffer->pixel_to_g[xcol.pixel] = gray;
843 buffer->pixel_to_b[xcol.pixel] = gray;
844 }
845
846 if (colorsfailed && _mesa_getenv("MESA_DEBUG")) {
847 _mesa_warning(NULL,
848 "Note: %d out of 256 needed colors do not match exactly.\n",
849 colorsfailed );
850 }
851 }
852 }
853
854 v->dithered_pf = PF_Grayscale;
855 v->undithered_pf = PF_Grayscale;
856 return GL_TRUE;
857 }
858
859
860
861 /*
862 * Setup RGB rendering for a window with a PseudoColor, StaticColor,
863 * or 8-bit TrueColor visual visual. We try to allocate a palette of 225
864 * colors (5 red, 9 green, 5 blue) and dither to approximate a 24-bit RGB
865 * color. While this function was originally designed just for 8-bit
866 * visuals, it has also proven to work from 4-bit up to 16-bit visuals.
867 * Dithering code contributed by Bob Mercier.
868 */
869 static GLboolean setup_dithered_color( int client, XMesaVisual v,
870 XMesaBuffer buffer, XMesaColormap cmap )
871 {
872 if (GET_VISUAL_DEPTH(v)<4 || GET_VISUAL_DEPTH(v)>16) {
873 return GL_FALSE;
874 }
875
876 if (buffer) {
877 XMesaBuffer prevBuffer;
878
879 if (!cmap) {
880 return GL_FALSE;
881 }
882
883 prevBuffer = find_xmesa_buffer(v->display, cmap, buffer);
884 if (prevBuffer &&
885 (buffer->xm_visual->mesa_visual.rgbMode ==
886 prevBuffer->xm_visual->mesa_visual.rgbMode)) {
887 /* Copy colormap stuff from previous, matching XMesaBuffer.
888 * Do this to avoid time spent in noFaultXAllocColor.
889 */
890 copy_colortable_info(buffer, prevBuffer);
891 }
892 else {
893 /* Allocate X colors and initialize color_table[], red_table[], etc */
894 int r, g, b, i;
895 int colorsfailed = 0;
896 for (r = 0; r < DITH_R; r++) {
897 for (g = 0; g < DITH_G; g++) {
898 for (b = 0; b < DITH_B; b++) {
899 XMesaColor xcol;
900 int exact, alloced;
901 xcol.red =gamma_adjust(v->RedGamma, r*65535/(DITH_R-1),65535);
902 xcol.green=gamma_adjust(v->GreenGamma, g*65535/(DITH_G-1),65535);
903 xcol.blue =gamma_adjust(v->BlueGamma, b*65535/(DITH_B-1),65535);
904 noFaultXAllocColor( client, v->display,
905 cmap, GET_COLORMAP_SIZE(v),
906 &xcol, &exact, &alloced );
907 if (!exact) {
908 colorsfailed++;
909 }
910 if (alloced) {
911 assert(buffer->num_alloced<256);
912 buffer->alloced_colors[buffer->num_alloced] = xcol.pixel;
913 buffer->num_alloced++;
914 }
915 i = DITH_MIX( r, g, b );
916 assert(i < 576);
917 buffer->color_table[i] = xcol.pixel;
918 assert(xcol.pixel < 65536);
919 buffer->pixel_to_r[xcol.pixel] = r * 255 / (DITH_R-1);
920 buffer->pixel_to_g[xcol.pixel] = g * 255 / (DITH_G-1);
921 buffer->pixel_to_b[xcol.pixel] = b * 255 / (DITH_B-1);
922 }
923 }
924 }
925
926 if (colorsfailed && _mesa_getenv("MESA_DEBUG")) {
927 _mesa_warning(NULL,
928 "Note: %d out of %d needed colors do not match exactly.\n",
929 colorsfailed, DITH_R * DITH_G * DITH_B );
930 }
931 }
932 }
933
934 v->dithered_pf = PF_Dither;
935 v->undithered_pf = PF_Lookup;
936 return GL_TRUE;
937 }
938
939
940 /*
941 * Setup for Hewlett Packard Color Recovery 8-bit TrueColor mode.
942 * HPCR simulates 24-bit color fidelity with an 8-bit frame buffer.
943 * Special dithering tables have to be initialized.
944 */
945 static void setup_8bit_hpcr( XMesaVisual v )
946 {
947 /* HP Color Recovery contributed by: Alex De Bruyn (ad@lms.be)
948 * To work properly, the atom _HP_RGB_SMOOTH_MAP_LIST must be defined
949 * on the root window AND the colormap obtainable by XGetRGBColormaps
950 * for that atom must be set on the window. (see also tkInitWindow)
951 * If that colormap is not set, the output will look stripy.
952 */
953
954 /* Setup color tables with gamma correction */
955 int i;
956 double g;
957
958 g = 1.0 / v->RedGamma;
959 for (i=0; i<256; i++) {
960 GLint red = IROUND_POS(255.0 * _mesa_pow( hpcr_rgbTbl[0][i]/255.0, g ));
961 v->hpcr_rgbTbl[0][i] = CLAMP( red, 16, 239 );
962 }
963
964 g = 1.0 / v->GreenGamma;
965 for (i=0; i<256; i++) {
966 GLint green = IROUND_POS(255.0 * _mesa_pow( hpcr_rgbTbl[1][i]/255.0, g ));
967 v->hpcr_rgbTbl[1][i] = CLAMP( green, 16, 239 );
968 }
969
970 g = 1.0 / v->BlueGamma;
971 for (i=0; i<256; i++) {
972 GLint blue = IROUND_POS(255.0 * _mesa_pow( hpcr_rgbTbl[2][i]/255.0, g ));
973 v->hpcr_rgbTbl[2][i] = CLAMP( blue, 32, 223 );
974 }
975 v->undithered_pf = PF_HPCR; /* can't really disable dithering for now */
976 v->dithered_pf = PF_HPCR;
977
978 /* which method should I use to clear */
979 /* GL_FALSE: keep the ordinary method */
980 /* GL_TRUE : clear with dither pattern */
981 v->hpcr_clear_flag = _mesa_getenv("MESA_HPCR_CLEAR") ? GL_TRUE : GL_FALSE;
982
983 if (v->hpcr_clear_flag) {
984 v->hpcr_clear_pixmap = XMesaCreatePixmap(v->display,
985 DefaultRootWindow(v->display),
986 16, 2, 8);
987 #ifndef XFree86Server
988 v->hpcr_clear_ximage = XGetImage(v->display, v->hpcr_clear_pixmap,
989 0, 0, 16, 2, AllPlanes, ZPixmap);
990 #endif
991 }
992 }
993
994
995 /*
996 * Setup RGB rendering for a window with a True/DirectColor visual.
997 */
998 static void setup_truecolor( XMesaVisual v, XMesaBuffer buffer,
999 XMesaColormap cmap )
1000 {
1001 unsigned long rmask, gmask, bmask;
1002 (void) buffer;
1003 (void) cmap;
1004
1005 /* Compute red multiplier (mask) and bit shift */
1006 v->rshift = 0;
1007 rmask = GET_REDMASK(v);
1008 while ((rmask & 1)==0) {
1009 v->rshift++;
1010 rmask = rmask >> 1;
1011 }
1012
1013 /* Compute green multiplier (mask) and bit shift */
1014 v->gshift = 0;
1015 gmask = GET_GREENMASK(v);
1016 while ((gmask & 1)==0) {
1017 v->gshift++;
1018 gmask = gmask >> 1;
1019 }
1020
1021 /* Compute blue multiplier (mask) and bit shift */
1022 v->bshift = 0;
1023 bmask = GET_BLUEMASK(v);
1024 while ((bmask & 1)==0) {
1025 v->bshift++;
1026 bmask = bmask >> 1;
1027 }
1028
1029 /*
1030 * Compute component-to-pixel lookup tables and dithering kernel
1031 */
1032 {
1033 static GLubyte kernel[16] = {
1034 0*16, 8*16, 2*16, 10*16,
1035 12*16, 4*16, 14*16, 6*16,
1036 3*16, 11*16, 1*16, 9*16,
1037 15*16, 7*16, 13*16, 5*16,
1038 };
1039 GLint rBits = bitcount(rmask);
1040 GLint gBits = bitcount(gmask);
1041 GLint bBits = bitcount(bmask);
1042 GLint maxBits;
1043 GLuint i;
1044
1045 /* convert pixel components in [0,_mask] to RGB values in [0,255] */
1046 for (i=0; i<=rmask; i++)
1047 v->PixelToR[i] = (unsigned char) ((i * 255) / rmask);
1048 for (i=0; i<=gmask; i++)
1049 v->PixelToG[i] = (unsigned char) ((i * 255) / gmask);
1050 for (i=0; i<=bmask; i++)
1051 v->PixelToB[i] = (unsigned char) ((i * 255) / bmask);
1052
1053 /* convert RGB values from [0,255] to pixel components */
1054
1055 for (i=0;i<256;i++) {
1056 GLint r = gamma_adjust(v->RedGamma, i, 255);
1057 GLint g = gamma_adjust(v->GreenGamma, i, 255);
1058 GLint b = gamma_adjust(v->BlueGamma, i, 255);
1059 v->RtoPixel[i] = (r >> (8-rBits)) << v->rshift;
1060 v->GtoPixel[i] = (g >> (8-gBits)) << v->gshift;
1061 v->BtoPixel[i] = (b >> (8-bBits)) << v->bshift;
1062 }
1063 /* overflow protection */
1064 for (i=256;i<512;i++) {
1065 v->RtoPixel[i] = v->RtoPixel[255];
1066 v->GtoPixel[i] = v->GtoPixel[255];
1067 v->BtoPixel[i] = v->BtoPixel[255];
1068 }
1069
1070 /* setup dithering kernel */
1071 maxBits = rBits;
1072 if (gBits > maxBits) maxBits = gBits;
1073 if (bBits > maxBits) maxBits = bBits;
1074 for (i=0;i<16;i++) {
1075 v->Kernel[i] = kernel[i] >> maxBits;
1076 }
1077
1078 v->undithered_pf = PF_Truecolor;
1079 v->dithered_pf = (GET_VISUAL_DEPTH(v)<24) ? PF_Dither_True : PF_Truecolor;
1080 }
1081
1082 /*
1083 * Now check for TrueColor visuals which we can optimize.
1084 */
1085 if ( GET_REDMASK(v) ==0x0000ff
1086 && GET_GREENMASK(v)==0x00ff00
1087 && GET_BLUEMASK(v) ==0xff0000
1088 && CHECK_BYTE_ORDER(v)
1089 && v->BitsPerPixel==32
1090 && sizeof(GLuint)==4
1091 && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
1092 /* common 32 bpp config used on SGI, Sun */
1093 v->undithered_pf = v->dithered_pf = PF_8A8B8G8R;
1094 }
1095 else if (GET_REDMASK(v) ==0xff0000
1096 && GET_GREENMASK(v)==0x00ff00
1097 && GET_BLUEMASK(v) ==0x0000ff
1098 && CHECK_BYTE_ORDER(v)
1099 && v->BitsPerPixel==32
1100 && sizeof(GLuint)==4
1101 && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
1102 /* common 32 bpp config used on Linux, HP, IBM */
1103 v->undithered_pf = v->dithered_pf = PF_8R8G8B;
1104 }
1105 else if (GET_REDMASK(v) ==0xff0000
1106 && GET_GREENMASK(v)==0x00ff00
1107 && GET_BLUEMASK(v) ==0x0000ff
1108 && CHECK_BYTE_ORDER(v)
1109 && v->BitsPerPixel==24
1110 && sizeof(GLuint)==4
1111 && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
1112 /* common packed 24 bpp config used on Linux */
1113 v->undithered_pf = v->dithered_pf = PF_8R8G8B24;
1114 }
1115 else if (GET_REDMASK(v) ==0xf800
1116 && GET_GREENMASK(v)==0x07e0
1117 && GET_BLUEMASK(v) ==0x001f
1118 && CHECK_BYTE_ORDER(v)
1119 && v->BitsPerPixel==16
1120 && sizeof(GLushort)==2
1121 && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
1122 /* 5-6-5 color weight on common PC VGA boards */
1123 v->undithered_pf = PF_5R6G5B;
1124 v->dithered_pf = PF_Dither_5R6G5B;
1125 }
1126 else if (GET_REDMASK(v) ==0xe0
1127 && GET_GREENMASK(v)==0x1c
1128 && GET_BLUEMASK(v) ==0x03
1129 && CHECK_FOR_HPCR(v)) {
1130 setup_8bit_hpcr( v );
1131 }
1132 }
1133
1134
1135
1136 /*
1137 * Setup RGB rendering for a window with a monochrome visual.
1138 */
1139 static void setup_monochrome( XMesaVisual v, XMesaBuffer b )
1140 {
1141 (void) b;
1142 v->dithered_pf = v->undithered_pf = PF_1Bit;
1143 /* if black=1 then we must flip pixel values */
1144 v->bitFlip = (GET_BLACK_PIXEL(v) != 0);
1145 }
1146
1147
1148
1149 /*
1150 * When a context is "made current" for the first time, we can finally
1151 * finish initializing the context's visual and buffer information.
1152 * Input: v - the XMesaVisual to initialize
1153 * b - the XMesaBuffer to initialize (may be NULL)
1154 * rgb_flag - TRUE = RGBA mode, FALSE = color index mode
1155 * window - the window/pixmap we're rendering into
1156 * cmap - the colormap associated with the window/pixmap
1157 * Return: GL_TRUE=success, GL_FALSE=failure
1158 */
1159 static GLboolean initialize_visual_and_buffer( int client,
1160 XMesaVisual v,
1161 XMesaBuffer b,
1162 GLboolean rgb_flag,
1163 XMesaDrawable window,
1164 XMesaColormap cmap )
1165 {
1166 #ifndef XFree86Server
1167 XGCValues gcvalues;
1168 #endif
1169
1170 if (b) {
1171 assert(b->xm_visual == v);
1172 }
1173
1174 /* Save true bits/pixel */
1175 v->BitsPerPixel = bits_per_pixel(v);
1176 assert(v->BitsPerPixel > 0);
1177
1178
1179 if (rgb_flag==GL_FALSE) {
1180 /* COLOR-INDEXED WINDOW:
1181 * Even if the visual is TrueColor or DirectColor we treat it as
1182 * being color indexed. This is weird but might be useful to someone.
1183 */
1184 v->dithered_pf = v->undithered_pf = PF_Index;
1185 v->mesa_visual.indexBits = GET_VISUAL_DEPTH(v);
1186 }
1187 else {
1188 /* RGB WINDOW:
1189 * We support RGB rendering into almost any kind of visual.
1190 */
1191 const int xclass = v->mesa_visual.visualType;
1192 if (xclass==GLX_TRUE_COLOR || xclass==GLX_DIRECT_COLOR) {
1193 setup_truecolor( v, b, cmap );
1194 }
1195 else if (xclass==GLX_STATIC_GRAY && GET_VISUAL_DEPTH(v)==1) {
1196 setup_monochrome( v, b );
1197 }
1198 else if (xclass==GLX_GRAY_SCALE || xclass==GLX_STATIC_GRAY) {
1199 if (!setup_grayscale( client, v, b, cmap )) {
1200 return GL_FALSE;
1201 }
1202 }
1203 else if ((xclass==GLX_PSEUDO_COLOR || xclass==GLX_STATIC_COLOR)
1204 && GET_VISUAL_DEPTH(v)>=4 && GET_VISUAL_DEPTH(v)<=16) {
1205 if (!setup_dithered_color( client, v, b, cmap )) {
1206 return GL_FALSE;
1207 }
1208 }
1209 else {
1210 _mesa_warning(NULL, "XMesa: RGB mode rendering not supported in given visual.");
1211 return GL_FALSE;
1212 }
1213 v->mesa_visual.indexBits = 0;
1214
1215 if (_mesa_getenv("MESA_NO_DITHER")) {
1216 v->dithered_pf = v->undithered_pf;
1217 }
1218 }
1219
1220
1221 /*
1222 * If MESA_INFO env var is set print out some debugging info
1223 * which can help Brian figure out what's going on when a user
1224 * reports bugs.
1225 */
1226 if (_mesa_getenv("MESA_INFO")) {
1227 _mesa_printf("X/Mesa visual = %p\n", (void *) v);
1228 _mesa_printf("X/Mesa dithered pf = %u\n", v->dithered_pf);
1229 _mesa_printf("X/Mesa undithered pf = %u\n", v->undithered_pf);
1230 _mesa_printf("X/Mesa level = %d\n", v->mesa_visual.level);
1231 _mesa_printf("X/Mesa depth = %d\n", GET_VISUAL_DEPTH(v));
1232 _mesa_printf("X/Mesa bits per pixel = %d\n", v->BitsPerPixel);
1233 }
1234
1235 if (b && window) {
1236 /* Do window-specific initializations */
1237
1238 b->frontbuffer = window;
1239
1240 /* Setup for single/double buffering */
1241 if (v->mesa_visual.doubleBufferMode) {
1242 /* Double buffered */
1243 #ifndef XFree86Server
1244 b->shm = check_for_xshm( v->display );
1245 #endif
1246 xmesa_alloc_back_buffer( b );
1247 if (b->db_state==BACK_PIXMAP) {
1248 b->buffer = (XMesaDrawable)b->backpixmap;
1249 }
1250 else {
1251 b->buffer = XIMAGE;
1252 }
1253 }
1254 else {
1255 /* Single Buffered */
1256 b->buffer = b->frontbuffer;
1257 }
1258
1259 /* X11 graphics contexts */
1260 #ifdef XFree86Server
1261 b->gc = CreateScratchGC(v->display, window->depth);
1262 #else
1263 b->gc = XCreateGC( v->display, window, 0, NULL );
1264 #endif
1265 XMesaSetFunction( v->display, b->gc, GXcopy );
1266
1267 /* cleargc - for glClear() */
1268 #ifdef XFree86Server
1269 b->cleargc = CreateScratchGC(v->display, window->depth);
1270 #else
1271 b->cleargc = XCreateGC( v->display, window, 0, NULL );
1272 #endif
1273 XMesaSetFunction( v->display, b->cleargc, GXcopy );
1274
1275 /*
1276 * Don't generate Graphics Expose/NoExpose events in swapbuffers().
1277 * Patch contributed by Michael Pichler May 15, 1995.
1278 */
1279 #ifdef XFree86Server
1280 b->swapgc = CreateScratchGC(v->display, window->depth);
1281 {
1282 CARD32 v[1];
1283 v[0] = FALSE;
1284 dixChangeGC(NullClient, b->swapgc, GCGraphicsExposures, v, NULL);
1285 }
1286 #else
1287 gcvalues.graphics_exposures = False;
1288 b->swapgc = XCreateGC( v->display, window,
1289 GCGraphicsExposures, &gcvalues);
1290 #endif
1291 XMesaSetFunction( v->display, b->swapgc, GXcopy );
1292 /*
1293 * Set fill style and tile pixmap once for all for HPCR stuff
1294 * (instead of doing it each time in clear_color_HPCR_pixmap())
1295 * Initialize whole stuff
1296 * Patch contributed by Jacques Leroy March 8, 1998.
1297 */
1298 if (v->hpcr_clear_flag && b->buffer!=XIMAGE) {
1299 int i;
1300 for (i=0; i<16; i++)
1301 {
1302 XMesaPutPixel(v->hpcr_clear_ximage, i, 0, 0);
1303 XMesaPutPixel(v->hpcr_clear_ximage, i, 1, 0);
1304 }
1305 XMesaPutImage(b->display, (XMesaDrawable)v->hpcr_clear_pixmap,
1306 b->cleargc, v->hpcr_clear_ximage, 0, 0, 0, 0, 16, 2);
1307 XMesaSetFillStyle( v->display, b->cleargc, FillTiled);
1308 XMesaSetTile( v->display, b->cleargc, v->hpcr_clear_pixmap );
1309 }
1310
1311 /* Initialize the row buffer XImage for use in write_color_span() */
1312 #ifdef XFree86Server
1313 b->rowimage = XMesaCreateImage(GET_VISUAL_DEPTH(v), MAX_WIDTH, 1,
1314 (char *)MALLOC(MAX_WIDTH*4));
1315 #else
1316 b->rowimage = XCreateImage( v->display,
1317 v->visinfo->visual,
1318 v->visinfo->depth,
1319 ZPixmap, 0, /*format, offset*/
1320 (char*) MALLOC(MAX_WIDTH*4), /*data*/
1321 MAX_WIDTH, 1, /*width, height*/
1322 32, /*bitmap_pad*/
1323 0 /*bytes_per_line*/ );
1324 #endif
1325 if (!b->rowimage)
1326 return GL_FALSE;
1327 }
1328
1329 return GL_TRUE;
1330 }
1331
1332
1333
1334 /*
1335 * Convert an RGBA color to a pixel value.
1336 */
1337 unsigned long
1338 xmesa_color_to_pixel( XMesaContext xmesa, GLubyte r, GLubyte g, GLubyte b, GLubyte a,
1339 GLuint pixelFormat)
1340 {
1341 switch (pixelFormat) {
1342 case PF_Index:
1343 return 0;
1344 case PF_Truecolor:
1345 {
1346 unsigned long p;
1347 PACK_TRUECOLOR( p, r, g, b );
1348 return p;
1349 }
1350 case PF_8A8B8G8R:
1351 return PACK_8A8B8G8R( r, g, b, a );
1352 case PF_8R8G8B:
1353 /* fall through */
1354 case PF_8R8G8B24:
1355 return PACK_8R8G8B( r, g, b );
1356 case PF_5R6G5B:
1357 return PACK_5R6G5B( r, g, b );
1358 case PF_Dither:
1359 {
1360 DITHER_SETUP;
1361 return DITHER( 1, 0, r, g, b );
1362 }
1363 case PF_1Bit:
1364 /* 382 = (3*255)/2 */
1365 return ((r+g+b) > 382) ^ xmesa->xm_visual->bitFlip;
1366 case PF_HPCR:
1367 return DITHER_HPCR(1, 1, r, g, b);
1368 case PF_Lookup:
1369 {
1370 LOOKUP_SETUP;
1371 return LOOKUP( r, g, b );
1372 }
1373 case PF_Grayscale:
1374 return GRAY_RGB( r, g, b );
1375 case PF_Dither_True:
1376 /* fall through */
1377 case PF_Dither_5R6G5B:
1378 {
1379 unsigned long p;
1380 PACK_TRUEDITHER(p, 1, 0, r, g, b);
1381 return p;
1382 }
1383 default:
1384 _mesa_problem(NULL, "Bad pixel format in xmesa_color_to_pixel");
1385 }
1386 return 0;
1387 }
1388
1389
1390 #define NUM_VISUAL_TYPES 6
1391
1392 /**
1393 * Convert an X visual type to a GLX visual type.
1394 *
1395 * \param visualType X visual type (i.e., \c TrueColor, \c StaticGray, etc.)
1396 * to be converted.
1397 * \return If \c visualType is a valid X visual type, a GLX visual type will
1398 * be returned. Otherwise \c GLX_NONE will be returned.
1399 *
1400 * \note
1401 * This code was lifted directly from lib/GL/glx/glcontextmodes.c in the
1402 * DRI CVS tree.
1403 */
1404 static GLint
1405 xmesa_convert_from_x_visual_type( int visualType )
1406 {
1407 static const int glx_visual_types[ NUM_VISUAL_TYPES ] = {
1408 GLX_STATIC_GRAY, GLX_GRAY_SCALE,
1409 GLX_STATIC_COLOR, GLX_PSEUDO_COLOR,
1410 GLX_TRUE_COLOR, GLX_DIRECT_COLOR
1411 };
1412
1413 return ( (unsigned) visualType < NUM_VISUAL_TYPES )
1414 ? glx_visual_types[ visualType ] : GLX_NONE;
1415 }
1416
1417
1418 /**********************************************************************/
1419 /***** Public Functions *****/
1420 /**********************************************************************/
1421
1422
1423 /*
1424 * Create a new X/Mesa visual.
1425 * Input: display - X11 display
1426 * visinfo - an XVisualInfo pointer
1427 * rgb_flag - GL_TRUE = RGB mode,
1428 * GL_FALSE = color index mode
1429 * alpha_flag - alpha buffer requested?
1430 * db_flag - GL_TRUE = double-buffered,
1431 * GL_FALSE = single buffered
1432 * stereo_flag - stereo visual?
1433 * ximage_flag - GL_TRUE = use an XImage for back buffer,
1434 * GL_FALSE = use an off-screen pixmap for back buffer
1435 * depth_size - requested bits/depth values, or zero
1436 * stencil_size - requested bits/stencil values, or zero
1437 * accum_red_size - requested bits/red accum values, or zero
1438 * accum_green_size - requested bits/green accum values, or zero
1439 * accum_blue_size - requested bits/blue accum values, or zero
1440 * accum_alpha_size - requested bits/alpha accum values, or zero
1441 * num_samples - number of samples/pixel if multisampling, or zero
1442 * level - visual level, usually 0
1443 * visualCaveat - ala the GLX extension, usually GLX_NONE
1444 * Return; a new XMesaVisual or 0 if error.
1445 */
1446 XMesaVisual XMesaCreateVisual( XMesaDisplay *display,
1447 XMesaVisualInfo visinfo,
1448 GLboolean rgb_flag,
1449 GLboolean alpha_flag,
1450 GLboolean db_flag,
1451 GLboolean stereo_flag,
1452 GLboolean ximage_flag,
1453 GLint depth_size,
1454 GLint stencil_size,
1455 GLint accum_red_size,
1456 GLint accum_green_size,
1457 GLint accum_blue_size,
1458 GLint accum_alpha_size,
1459 GLint num_samples,
1460 GLint level,
1461 GLint visualCaveat )
1462 {
1463 char *gamma;
1464 XMesaVisual v;
1465 GLint red_bits, green_bits, blue_bits, alpha_bits;
1466
1467 /* For debugging only */
1468 if (_mesa_getenv("MESA_XSYNC")) {
1469 /* This makes debugging X easier.
1470 * In your debugger, set a breakpoint on _XError to stop when an
1471 * X protocol error is generated.
1472 */
1473 #ifdef XFree86Server
1474 /* NOT_NEEDED */
1475 #else
1476 XSynchronize( display, 1 );
1477 #endif
1478 }
1479
1480 v = (XMesaVisual) CALLOC_STRUCT(xmesa_visual);
1481 if (!v) {
1482 return NULL;
1483 }
1484
1485 /*
1486 * In the X server, NULL is passed in for the display. It will have
1487 * to be set before using this visual. See XMesaSetVisualDisplay()
1488 * below.
1489 */
1490 v->display = display;
1491
1492 /* Save a copy of the XVisualInfo struct because the user may XFREE()
1493 * the struct but we may need some of the information contained in it
1494 * at a later time.
1495 */
1496 #ifndef XFree86Server
1497 v->visinfo = (XVisualInfo *) MALLOC(sizeof(*visinfo));
1498 if(!v->visinfo) {
1499 FREE(v);
1500 return NULL;
1501 }
1502 MEMCPY(v->visinfo, visinfo, sizeof(*visinfo));
1503 #endif
1504
1505 /* check for MESA_GAMMA environment variable */
1506 gamma = _mesa_getenv("MESA_GAMMA");
1507 if (gamma) {
1508 v->RedGamma = v->GreenGamma = v->BlueGamma = 0.0;
1509 sscanf( gamma, "%f %f %f", &v->RedGamma, &v->GreenGamma, &v->BlueGamma );
1510 if (v->RedGamma<=0.0) v->RedGamma = 1.0;
1511 if (v->GreenGamma<=0.0) v->GreenGamma = v->RedGamma;
1512 if (v->BlueGamma<=0.0) v->BlueGamma = v->RedGamma;
1513 }
1514 else {
1515 v->RedGamma = v->GreenGamma = v->BlueGamma = 1.0;
1516 }
1517
1518 v->ximage_flag = ximage_flag;
1519
1520 #ifdef XFree86Server
1521 /* We could calculate these values by ourselves. nplanes is either the sum
1522 * of the red, green, and blue bits or the number index bits.
1523 * ColormapEntries is either (1U << index_bits) or
1524 * (1U << max(redBits, greenBits, blueBits)).
1525 */
1526 v->nplanes = visinfo->nplanes;
1527 v->ColormapEntries = visinfo->ColormapEntries;
1528
1529 v->mesa_visual.redMask = visinfo->redMask;
1530 v->mesa_visual.greenMask = visinfo->greenMask;
1531 v->mesa_visual.blueMask = visinfo->blueMask;
1532 v->mesa_visual.visualID = visinfo->vid;
1533 v->mesa_visual.screen = 0; /* FIXME: What should be done here? */
1534 #else
1535 v->mesa_visual.redMask = visinfo->red_mask;
1536 v->mesa_visual.greenMask = visinfo->green_mask;
1537 v->mesa_visual.blueMask = visinfo->blue_mask;
1538 v->mesa_visual.visualID = visinfo->visualid;
1539 v->mesa_visual.screen = visinfo->screen;
1540 #endif
1541
1542 #if defined(XFree86Server) || !(defined(__cplusplus) || defined(c_plusplus))
1543 v->mesa_visual.visualType = xmesa_convert_from_x_visual_type(visinfo->class);
1544 #else
1545 v->mesa_visual.visualType = xmesa_convert_from_x_visual_type(visinfo->c_class);
1546 #endif
1547
1548 v->mesa_visual.visualRating = visualCaveat;
1549
1550 (void) initialize_visual_and_buffer( 0, v, NULL, rgb_flag, 0, 0 );
1551
1552 {
1553 const int xclass = v->mesa_visual.visualType;
1554 if (xclass==GLX_TRUE_COLOR || xclass==GLX_DIRECT_COLOR) {
1555 red_bits = bitcount(GET_REDMASK(v));
1556 green_bits = bitcount(GET_GREENMASK(v));
1557 blue_bits = bitcount(GET_BLUEMASK(v));
1558 alpha_bits = 0;
1559 }
1560 else {
1561 /* this is an approximation */
1562 int depth;
1563 depth = GET_VISUAL_DEPTH(v);
1564 red_bits = depth / 3;
1565 depth -= red_bits;
1566 green_bits = depth / 2;
1567 depth -= green_bits;
1568 blue_bits = depth;
1569 alpha_bits = 0;
1570 assert( red_bits + green_bits + blue_bits == GET_VISUAL_DEPTH(v) );
1571 }
1572 }
1573
1574 if (alpha_flag && alpha_bits == 0)
1575 alpha_bits = 8;
1576
1577 _mesa_initialize_visual( &v->mesa_visual,
1578 rgb_flag, db_flag, stereo_flag,
1579 red_bits, green_bits,
1580 blue_bits, alpha_bits,
1581 v->mesa_visual.indexBits,
1582 depth_size,
1583 stencil_size,
1584 accum_red_size, accum_green_size,
1585 accum_blue_size, accum_alpha_size,
1586 0 );
1587
1588 /* XXX minor hack */
1589 v->mesa_visual.level = level;
1590 return v;
1591 }
1592
1593
1594 void XMesaSetVisualDisplay( XMesaDisplay *dpy, XMesaVisual v )
1595 {
1596 v->display = dpy;
1597 }
1598
1599
1600 void XMesaDestroyVisual( XMesaVisual v )
1601 {
1602 #ifndef XFree86Server
1603 FREE(v->visinfo);
1604 #endif
1605 FREE(v);
1606 }
1607
1608
1609
1610 /**
1611 * Create a new XMesaContext.
1612 * \param v the XMesaVisual
1613 * \param share_list another XMesaContext with which to share display
1614 * lists or NULL if no sharing is wanted.
1615 * \return an XMesaContext or NULL if error.
1616 */
1617 XMesaContext XMesaCreateContext( XMesaVisual v, XMesaContext share_list )
1618 {
1619 static GLboolean firstTime = GL_TRUE;
1620 XMesaContext c;
1621 GLcontext *mesaCtx;
1622 struct dd_function_table functions;
1623 TNLcontext *tnl;
1624
1625 if (firstTime) {
1626 _glthread_INIT_MUTEX(_xmesa_lock);
1627 firstTime = GL_FALSE;
1628 }
1629
1630 /* Note: the XMesaContext contains a Mesa GLcontext struct (inheritance) */
1631 c = (XMesaContext) CALLOC_STRUCT(xmesa_context);
1632 if (!c)
1633 return NULL;
1634
1635 mesaCtx = &(c->mesa);
1636
1637 /* initialize with default driver functions, then plug in XMesa funcs */
1638 _mesa_init_driver_functions(&functions);
1639 xmesa_init_driver_functions(v, &functions);
1640 if (!_mesa_initialize_context(mesaCtx, &v->mesa_visual,
1641 share_list ? &(share_list->mesa) : (GLcontext *) NULL,
1642 &functions, (void *) c)) {
1643 FREE(c);
1644 return NULL;
1645 }
1646
1647 _mesa_enable_sw_extensions(mesaCtx);
1648 _mesa_enable_1_3_extensions(mesaCtx);
1649 _mesa_enable_1_4_extensions(mesaCtx);
1650 _mesa_enable_1_5_extensions(mesaCtx);
1651 _mesa_enable_2_0_extensions(mesaCtx);
1652 #if SWTC
1653 if (c->Mesa_DXTn) {
1654 _mesa_enable_extension(c, "GL_EXT_texture_compression_s3tc");
1655 _mesa_enable_extension(c, "GL_S3_s3tc");
1656 }
1657 _mesa_enable_extension(c, "GL_3DFX_texture_compression_FXT1");
1658 #endif
1659
1660 /* finish up xmesa context initializations */
1661 c->swapbytes = CHECK_BYTE_ORDER(v) ? GL_FALSE : GL_TRUE;
1662 c->xm_visual = v;
1663 c->xm_draw_buffer = NULL; /* set later by XMesaMakeCurrent */
1664 c->xm_read_buffer = NULL; /* set later by XMesaMakeCurrent */
1665 c->xm_buffer = NULL; /* set later by XMesaMakeCurrent */
1666 c->display = v->display;
1667 c->pixelformat = v->dithered_pf; /* Dithering is enabled by default */
1668
1669 /* Initialize the software rasterizer and helper modules.
1670 */
1671 if (!_swrast_CreateContext( mesaCtx ) ||
1672 !_ac_CreateContext( mesaCtx ) ||
1673 !_tnl_CreateContext( mesaCtx ) ||
1674 !_swsetup_CreateContext( mesaCtx )) {
1675 _mesa_free_context_data(&c->mesa);
1676 _mesa_free(c);
1677 return NULL;
1678 }
1679
1680 /* tnl setup */
1681 tnl = TNL_CONTEXT(mesaCtx);
1682 tnl->Driver.RunPipeline = _tnl_run_pipeline;
1683 /* swrast setup */
1684 xmesa_register_swrast_functions( mesaCtx );
1685 _swsetup_Wakeup(mesaCtx);
1686
1687 return c;
1688 }
1689
1690
1691
1692 void XMesaDestroyContext( XMesaContext c )
1693 {
1694 GLcontext *mesaCtx = &c->mesa;
1695 #ifdef FX
1696 if (c->xm_draw_buffer && c->xm_buffer->FXctx)
1697 fxMesaDestroyContext(c->xm_draw_buffer->FXctx);
1698 #endif
1699 _swsetup_DestroyContext( mesaCtx );
1700 _swrast_DestroyContext( mesaCtx );
1701 _tnl_DestroyContext( mesaCtx );
1702 _ac_DestroyContext( mesaCtx );
1703 _mesa_free_context_data( mesaCtx );
1704 _mesa_free( c );
1705 }
1706
1707
1708
1709 /*
1710 * XXX this isn't a public function! It's a hack for the 3Dfx driver.
1711 * Create a new XMesaBuffer from an X window.
1712 * Input: v - the XMesaVisual
1713 * w - the window
1714 * c - the context
1715 * Return: new XMesaBuffer or NULL if error
1716 */
1717 XMesaBuffer XMesaCreateWindowBuffer2( XMesaVisual v, XMesaWindow w,
1718 XMesaContext c )
1719 {
1720 #ifndef XFree86Server
1721 XWindowAttributes attr;
1722 #endif
1723 #ifdef FX
1724 char *fxEnvVar;
1725 #endif
1726 int client = 0;
1727
1728 XMesaBuffer b = alloc_xmesa_buffer();
1729 if (!b) {
1730 return NULL;
1731 }
1732
1733 (void) c;
1734
1735 #ifdef XFree86Server
1736 client = CLIENT_ID(((XMesaDrawable)w)->id);
1737 #endif
1738
1739 assert(v);
1740
1741 #ifdef XFree86Server
1742 if (GET_VISUAL_DEPTH(v) != ((XMesaDrawable)w)->depth) {
1743 #else
1744 XGetWindowAttributes( v->display, w, &attr );
1745
1746 if (GET_VISUAL_DEPTH(v) != attr.depth) {
1747 #endif
1748 _mesa_warning(NULL, "XMesaCreateWindowBuffer: depth mismatch between visual and window! (%d != %d)\n", GET_VISUAL_DEPTH(v) , attr.depth );
1749 return NULL;
1750 }
1751
1752 b->xm_visual = v;
1753 b->type = WINDOW;
1754 b->display = v->display;
1755 #ifdef XFree86Server
1756 b->cmap = (ColormapPtr)LookupIDByType(wColormap(w), RT_COLORMAP);
1757 #else
1758 if (attr.colormap) {
1759 b->cmap = attr.colormap;
1760 }
1761 else {
1762 _mesa_warning(NULL, "Window %u has no colormap!\n", (unsigned int) w);
1763 /* this is weird, a window w/out a colormap!? */
1764 /* OK, let's just allocate a new one and hope for the best */
1765 b->cmap = XCreateColormap(v->display, w, attr.visual, AllocNone);
1766 }
1767 #endif
1768
1769 /* determine back buffer implementation */
1770 if (v->mesa_visual.doubleBufferMode) {
1771 if (v->ximage_flag) {
1772 b->db_state = BACK_XIMAGE;
1773 }
1774 else {
1775 b->db_state = BACK_PIXMAP;
1776 }
1777 }
1778 else {
1779 b->db_state = 0;
1780 }
1781
1782 _mesa_initialize_framebuffer(&b->mesa_buffer,
1783 &v->mesa_visual,
1784 v->mesa_visual.depthBits > 0,
1785 v->mesa_visual.stencilBits > 0,
1786 v->mesa_visual.accumRedBits > 0,
1787 v->mesa_visual.alphaBits > 0 );
1788 /* XXX hack */
1789 b->mesa_buffer.UseSoftwareAuxBuffers = GL_TRUE;
1790
1791 if (!initialize_visual_and_buffer( client, v, b, v->mesa_visual.rgbMode,
1792 (XMesaDrawable)w, b->cmap )) {
1793 free_xmesa_buffer(client, b);
1794 return NULL;
1795 }
1796
1797 #ifdef FX
1798 fxEnvVar = _mesa_getenv("MESA_GLX_FX");
1799 if (fxEnvVar) {
1800 if (fxEnvVar[0]!='d') {
1801 int attribs[100];
1802 int numAttribs = 0;
1803 int hw;
1804 if (v->mesa_visual.depthBits > 0) {
1805 attribs[numAttribs++] = FXMESA_DEPTH_SIZE;
1806 attribs[numAttribs++] = v->mesa_visual.depthBits;
1807 }
1808 if (v->mesa_visual.doubleBufferMode) {
1809 attribs[numAttribs++] = FXMESA_DOUBLEBUFFER;
1810 }
1811 if (v->mesa_visual.accumRedBits > 0) {
1812 attribs[numAttribs++] = FXMESA_ACCUM_SIZE;
1813 attribs[numAttribs++] = v->mesa_visual.accumRedBits;
1814 }
1815 if (v->mesa_visual.stencilBits > 0) {
1816 attribs[numAttribs++] = FXMESA_STENCIL_SIZE;
1817 attribs[numAttribs++] = v->mesa_visual.stencilBits;
1818 }
1819 if (v->mesa_visual.alphaBits > 0) {
1820 attribs[numAttribs++] = FXMESA_ALPHA_SIZE;
1821 attribs[numAttribs++] = v->mesa_visual.alphaBits;
1822 }
1823 if (1) {
1824 attribs[numAttribs++] = FXMESA_SHARE_CONTEXT;
1825 attribs[numAttribs++] = (int) &(c->mesa);
1826 }
1827 attribs[numAttribs++] = FXMESA_NONE;
1828
1829 /* [dBorca] we should take an envvar for `fxMesaSelectCurrentBoard'!!! */
1830 hw = fxMesaSelectCurrentBoard(0);
1831
1832 /* if these fail, there's a new bug somewhere */
1833 ASSERT(b->mesa_buffer.Width > 0);
1834 ASSERT(b->mesa_buffer.Height > 0);
1835
1836 if ((hw == GR_SSTTYPE_VOODOO) || (hw == GR_SSTTYPE_Voodoo2)) {
1837 b->FXctx = fxMesaCreateBestContext(0, b->mesa_buffer.Width,
1838 b->mesa_buffer.Height, attribs);
1839 if ((v->undithered_pf!=PF_Index) && (b->backimage)) {
1840 b->FXisHackUsable = b->FXctx ? GL_TRUE : GL_FALSE;
1841 if (b->FXctx && (fxEnvVar[0]=='w' || fxEnvVar[0]=='W')) {
1842 b->FXwindowHack = GL_TRUE;
1843 FX_grSstControl(GR_CONTROL_DEACTIVATE);
1844 }
1845 else {
1846 b->FXwindowHack = GL_FALSE;
1847 }
1848 }
1849 }
1850 else {
1851 if (fxEnvVar[0]=='w' || fxEnvVar[0]=='W')
1852 b->FXctx = fxMesaCreateContext(w, GR_RESOLUTION_NONE,
1853 GR_REFRESH_75Hz, attribs);
1854 else
1855 b->FXctx = fxMesaCreateBestContext(0, b->mesa_buffer.Width,
1856 b->mesa_buffer.Height, attribs);
1857 b->FXisHackUsable = GL_FALSE;
1858 b->FXwindowHack = GL_FALSE;
1859 }
1860 /*
1861 fprintf(stderr,
1862 "voodoo %d, wid %d height %d hack: usable %d active %d\n",
1863 hw, b->width, b->height, b->FXisHackUsable, b->FXwindowHack);
1864 */
1865 }
1866 }
1867 else {
1868 _mesa_warning(NULL, "WARNING: This Mesa Library includes the Glide driver but\n");
1869 _mesa_warning(NULL, " you have not defined the MESA_GLX_FX env. var.\n");
1870 _mesa_warning(NULL, " (check the README.3DFX file for more information).\n\n");
1871 _mesa_warning(NULL, " you can disable this message with a 'export MESA_GLX_FX=disable'.\n");
1872 }
1873 #endif
1874
1875 return b;
1876 }
1877
1878
1879 XMesaBuffer XMesaCreateWindowBuffer( XMesaVisual v, XMesaWindow w )
1880 {
1881 return XMesaCreateWindowBuffer2( v, w, NULL );
1882 }
1883
1884
1885 /**
1886 * Create a new XMesaBuffer from an X pixmap.
1887 *
1888 * \param v the XMesaVisual
1889 * \param p the pixmap
1890 * \param cmap the colormap, may be 0 if using a \c GLX_TRUE_COLOR or
1891 * \c GLX_DIRECT_COLOR visual for the pixmap
1892 * \returns new XMesaBuffer or NULL if error
1893 */
1894 XMesaBuffer XMesaCreatePixmapBuffer( XMesaVisual v,
1895 XMesaPixmap p, XMesaColormap cmap )
1896 {
1897 int client = 0;
1898 XMesaBuffer b = alloc_xmesa_buffer();
1899 if (!b) {
1900 return NULL;
1901 }
1902
1903
1904 #ifdef XFree86Server
1905 client = CLIENT_ID(((XMesaDrawable)p)->id);
1906 #endif
1907
1908 assert(v);
1909
1910 b->xm_visual = v;
1911 b->type = PIXMAP;
1912 b->display = v->display;
1913 b->cmap = cmap;
1914
1915 /* determine back buffer implementation */
1916 if (v->mesa_visual.doubleBufferMode) {
1917 if (v->ximage_flag) {
1918 b->db_state = BACK_XIMAGE;
1919 }
1920 else {
1921 b->db_state = BACK_PIXMAP;
1922 }
1923 }
1924 else {
1925 b->db_state = 0;
1926 }
1927
1928 _mesa_initialize_framebuffer(&b->mesa_buffer,
1929 &v->mesa_visual,
1930 v->mesa_visual.depthBits > 0,
1931 v->mesa_visual.stencilBits > 0,
1932 v->mesa_visual.accumRedBits +
1933 v->mesa_visual.accumGreenBits +
1934 v->mesa_visual.accumBlueBits > 0,
1935 v->mesa_visual.alphaBits > 0 );
1936
1937 if (!initialize_visual_and_buffer(client, v, b, v->mesa_visual.rgbMode,
1938 (XMesaDrawable)p, cmap)) {
1939 free_xmesa_buffer(client, b);
1940 return NULL;
1941 }
1942
1943 return b;
1944 }
1945
1946
1947
1948 XMesaBuffer XMesaCreatePBuffer( XMesaVisual v, XMesaColormap cmap,
1949 unsigned int width, unsigned int height )
1950 {
1951 #ifdef XFree86Server
1952 return 0;
1953 #else
1954 int client = 0;
1955 XMesaWindow root;
1956 XMesaDrawable drawable; /* X Pixmap Drawable */
1957 XMesaBuffer b = alloc_xmesa_buffer();
1958 if (!b) {
1959 return NULL;
1960 }
1961
1962 b->xm_visual = v;
1963 b->type = PBUFFER;
1964 b->display = v->display;
1965 b->cmap = cmap;
1966
1967 /* allocate pixmap for front buffer */
1968 root = RootWindow( v->display, v->visinfo->screen );
1969 drawable = XCreatePixmap( v->display, root, width, height, v->visinfo->depth );
1970
1971 /* determine back buffer implementation */
1972 if (v->mesa_visual.doubleBufferMode) {
1973 if (v->ximage_flag) {
1974 b->db_state = BACK_XIMAGE;
1975 }
1976 else {
1977 b->db_state = BACK_PIXMAP;
1978 }
1979 }
1980 else {
1981 b->db_state = 0;
1982 }
1983
1984 _mesa_initialize_framebuffer(&b->mesa_buffer,
1985 &v->mesa_visual,
1986 v->mesa_visual.depthBits > 0,
1987 v->mesa_visual.stencilBits > 0,
1988 v->mesa_visual.accumRedBits +
1989 v->mesa_visual.accumGreenBits +
1990 v->mesa_visual.accumBlueBits > 0,
1991 v->mesa_visual.alphaBits > 0 );
1992
1993 if (!initialize_visual_and_buffer(client, v, b, v->mesa_visual.rgbMode,
1994 drawable, cmap)) {
1995 free_xmesa_buffer(client, b);
1996 return NULL;
1997 }
1998
1999 return b;
2000 #endif
2001 }
2002
2003
2004
2005 /*
2006 * Deallocate an XMesaBuffer structure and all related info.
2007 */
2008 void XMesaDestroyBuffer( XMesaBuffer b )
2009 {
2010 int client = 0;
2011
2012 #ifdef XFree86Server
2013 if (b->frontbuffer)
2014 client = CLIENT_ID(b->frontbuffer->id);
2015 #endif
2016
2017 if (b->gc) XMesaFreeGC( b->xm_visual->display, b->gc );
2018 if (b->cleargc) XMesaFreeGC( b->xm_visual->display, b->cleargc );
2019 if (b->swapgc) XMesaFreeGC( b->xm_visual->display, b->swapgc );
2020
2021 if (b->backimage) {
2022 #if defined(USE_XSHM) && !defined(XFree86Server)
2023 if (b->shm) {
2024 XShmDetach( b->xm_visual->display, &b->shminfo );
2025 XDestroyImage( b->backimage );
2026 shmdt( b->shminfo.shmaddr );
2027 }
2028 else
2029 #endif
2030 XMesaDestroyImage( b->backimage );
2031 }
2032 if (b->backpixmap) {
2033 XMesaFreePixmap( b->xm_visual->display, b->backpixmap );
2034 if (b->xm_visual->hpcr_clear_flag) {
2035 XMesaFreePixmap( b->xm_visual->display,
2036 b->xm_visual->hpcr_clear_pixmap );
2037 XMesaDestroyImage( b->xm_visual->hpcr_clear_ximage );
2038 }
2039 }
2040 if (b->rowimage) {
2041 FREE( b->rowimage->data );
2042 b->rowimage->data = NULL;
2043 XMesaDestroyImage( b->rowimage );
2044 }
2045
2046 free_xmesa_buffer(client, b);
2047 }
2048
2049
2050
2051 /*
2052 * Bind buffer b to context c and make c the current rendering context.
2053 */
2054 GLboolean XMesaMakeCurrent( XMesaContext c, XMesaBuffer b )
2055 {
2056 return XMesaMakeCurrent2( c, b, b );
2057 }
2058
2059
2060 /*
2061 * Bind buffer b to context c and make c the current rendering context.
2062 */
2063 GLboolean XMesaMakeCurrent2( XMesaContext c, XMesaBuffer drawBuffer,
2064 XMesaBuffer readBuffer )
2065 {
2066 if (c) {
2067 if (!drawBuffer || !readBuffer)
2068 return GL_FALSE; /* must specify buffers! */
2069
2070 #ifdef FX
2071 if (drawBuffer->FXctx) {
2072 fxMesaMakeCurrent(drawBuffer->FXctx);
2073
2074 c->xm_draw_buffer = drawBuffer;
2075 c->xm_read_buffer = readBuffer;
2076 c->xm_buffer = drawBuffer;
2077
2078 return GL_TRUE;
2079 }
2080 #endif
2081 if (&(c->mesa) == _mesa_get_current_context()
2082 && c->xm_draw_buffer == drawBuffer
2083 && c->xm_read_buffer == readBuffer
2084 && c->xm_draw_buffer->wasCurrent) {
2085 /* same context and buffer, do nothing */
2086 return GL_TRUE;
2087 }
2088
2089 c->xm_draw_buffer = drawBuffer;
2090 c->xm_read_buffer = readBuffer;
2091 c->xm_buffer = drawBuffer;
2092
2093 _mesa_make_current2(&(c->mesa),
2094 &drawBuffer->mesa_buffer,
2095 &readBuffer->mesa_buffer);
2096
2097 if (c->xm_visual->mesa_visual.rgbMode) {
2098 /*
2099 * Must recompute and set these pixel values because colormap
2100 * can be different for different windows.
2101 */
2102 c->clearpixel = xmesa_color_to_pixel( c,
2103 c->clearcolor[0],
2104 c->clearcolor[1],
2105 c->clearcolor[2],
2106 c->clearcolor[3],
2107 c->xm_visual->undithered_pf);
2108 XMesaSetForeground(c->display, c->xm_draw_buffer->cleargc, c->clearpixel);
2109 }
2110
2111 /* Solution to Stephane Rehel's problem with glXReleaseBuffersMESA(): */
2112 c->xm_draw_buffer->wasCurrent = GL_TRUE;
2113 }
2114 else {
2115 /* Detach */
2116 _mesa_make_current2( NULL, NULL, NULL );
2117 }
2118 return GL_TRUE;
2119 }
2120
2121
2122 /*
2123 * Unbind the context c from its buffer.
2124 */
2125 GLboolean XMesaUnbindContext( XMesaContext c )
2126 {
2127 /* A no-op for XFree86 integration purposes */
2128 return GL_TRUE;
2129 }
2130
2131
2132 XMesaContext XMesaGetCurrentContext( void )
2133 {
2134 GET_CURRENT_CONTEXT(ctx);
2135 if (ctx) {
2136 XMesaContext xmesa = XMESA_CONTEXT(ctx);
2137 return xmesa;
2138 }
2139 else {
2140 return 0;
2141 }
2142 }
2143
2144
2145 XMesaBuffer XMesaGetCurrentBuffer( void )
2146 {
2147 GET_CURRENT_CONTEXT(ctx);
2148 if (ctx) {
2149 XMesaContext xmesa = XMESA_CONTEXT(ctx);
2150 return xmesa->xm_draw_buffer;
2151 }
2152 else {
2153 return 0;
2154 }
2155 }
2156
2157
2158 /* New in Mesa 3.1 */
2159 XMesaBuffer XMesaGetCurrentReadBuffer( void )
2160 {
2161 GET_CURRENT_CONTEXT(ctx);
2162 if (ctx) {
2163 XMesaContext xmesa = XMESA_CONTEXT(ctx);
2164 return xmesa->xm_read_buffer;
2165 }
2166 else {
2167 return 0;
2168 }
2169 }
2170
2171
2172 GLboolean XMesaForceCurrent(XMesaContext c)
2173 {
2174 if (c) {
2175 if (&(c->mesa) != _mesa_get_current_context()) {
2176 _mesa_make_current(&(c->mesa), &c->xm_draw_buffer->mesa_buffer);
2177 }
2178 }
2179 else {
2180 _mesa_make_current(NULL, NULL);
2181 }
2182 return GL_TRUE;
2183 }
2184
2185
2186 GLboolean XMesaLoseCurrent(XMesaContext c)
2187 {
2188 (void) c;
2189 _mesa_make_current(NULL, NULL);
2190 return GL_TRUE;
2191 }
2192
2193
2194 /*
2195 * Switch 3Dfx support hack between window and full-screen mode.
2196 */
2197 GLboolean XMesaSetFXmode( GLint mode )
2198 {
2199 #ifdef FX
2200 const char *fx = _mesa_getenv("MESA_GLX_FX");
2201 if (fx && fx[0] != 'd') {
2202 GET_CURRENT_CONTEXT(ctx);
2203 GrHwConfiguration hw;
2204 if (!FX_grSstQueryHardware(&hw)) {
2205 /*fprintf(stderr, "!grSstQueryHardware\n");*/
2206 return GL_FALSE;
2207 }
2208 if (hw.num_sst < 1) {
2209 /*fprintf(stderr, "hw.num_sst < 1\n");*/
2210 return GL_FALSE;
2211 }
2212 if (ctx) {
2213 /* [dBorca] Hack alert:
2214 * oh, this is sooo wrong: ctx above is
2215 * really an fxMesaContext, not an XMesaContext
2216 */
2217 XMesaContext xmesa = XMESA_CONTEXT(ctx);
2218 if (mode == XMESA_FX_WINDOW) {
2219 if (xmesa->xm_draw_buffer->FXisHackUsable) {
2220 FX_grSstControl(GR_CONTROL_DEACTIVATE);
2221 xmesa->xm_draw_buffer->FXwindowHack = GL_TRUE;
2222 return GL_TRUE;
2223 }
2224 }
2225 else if (mode == XMESA_FX_FULLSCREEN) {
2226 FX_grSstControl(GR_CONTROL_ACTIVATE);
2227 xmesa->xm_draw_buffer->FXwindowHack = GL_FALSE;
2228 return GL_TRUE;
2229 }
2230 else {
2231 /* Error: Bad mode value */
2232 }
2233 }
2234 }
2235 /*fprintf(stderr, "fallthrough\n");*/
2236 #else
2237 (void) mode;
2238 #endif
2239 return GL_FALSE;
2240 }
2241
2242
2243
2244 #ifdef FX
2245 /*
2246 * Read image from VooDoo frame buffer into X/Mesa's back XImage.
2247 */
2248 static void FXgetImage( XMesaBuffer b )
2249 {
2250 GET_CURRENT_CONTEXT(ctx);
2251 static unsigned short pixbuf[MAX_WIDTH];
2252 GLuint x, y;
2253 int xpos, ypos;
2254 XMesaWindow root;
2255 unsigned int bw, depth, width, height;
2256 XMesaContext xmesa = XMESA_CONTEXT(ctx);
2257
2258 #ifdef XFree86Server
2259 x = b->frontbuffer->x;
2260 y = b->frontbuffer->y;
2261 width = b->frontbuffer->width;
2262 height = b->frontbuffer->height;
2263 depth = b->frontbuffer->depth;
2264 #else
2265 XGetGeometry( b->xm_visual->display, b->frontbuffer,
2266 &root, &xpos, &ypos, &width, &height, &bw, &depth);
2267 #endif
2268 if (b->mesa_buffer.Width != width || b->mesa_buffer.Height != height) {
2269 b->mesa_buffer.Width = MIN2((int)width, b->FXctx->width);
2270 b->mesa_buffer.Height = MIN2((int)height, b->FXctx->height);
2271 if (b->mesa_buffer.Width & 1)
2272 b->mesa_buffer.Width--; /* prevent odd width */
2273 xmesa_alloc_back_buffer( b );
2274 }
2275
2276 /* [dBorca] we're always in the right GR_COLORFORMAT... aren't we? */
2277 /* grLfbWriteColorFormat(GR_COLORFORMAT_ARGB); */
2278 if (b->xm_visual->undithered_pf==PF_5R6G5B) {
2279 /* Special case: 16bpp RGB */
2280 grLfbReadRegion( GR_BUFFER_FRONTBUFFER, /* src buffer */
2281 0, b->FXctx->height - b->mesa_buffer.Height, /*pos*/
2282 b->mesa_buffer.Width, b->mesa_buffer.Height, /* size */
2283 b->mesa_buffer.Width * sizeof(GLushort), /* stride */
2284 b->backimage->data); /* dest buffer */
2285 }
2286 else if (b->xm_visual->dithered_pf==PF_Dither
2287 && GET_VISUAL_DEPTH(b->xm_visual)==8) {
2288 /* Special case: 8bpp RGB */
2289 for (y=0;y<b->mesa_buffer.Height;y++) {
2290 GLubyte *ptr = (GLubyte*) b->backimage->data
2291 + b->backimage->bytes_per_line * y;
2292 XDITHER_SETUP(y);
2293
2294 /* read row from 3Dfx frame buffer */
2295 grLfbReadRegion( GR_BUFFER_FRONTBUFFER,
2296 0, b->FXctx->height-(b->mesa_buffer.Height-y),
2297 b->mesa_buffer.Width, 1,
2298 0,
2299 pixbuf );
2300
2301 /* write to XImage back buffer */
2302 for (x=0;x<b->mesa_buffer.Width;x++) {
2303 GLubyte r = (pixbuf[x] & 0xf800) >> 8;
2304 GLubyte g = (pixbuf[x] & 0x07e0) >> 3;
2305 GLubyte b = (pixbuf[x] & 0x001f) << 3;
2306 *ptr++ = XDITHER( x, r, g, b);
2307 }
2308 }
2309 }
2310 else {
2311 /* General case: slow! */
2312 for (y=0;y<b->mesa_buffer.Height;y++) {
2313 /* read row from 3Dfx frame buffer */
2314 grLfbReadRegion( GR_BUFFER_FRONTBUFFER,
2315 0, b->FXctx->height-(b->mesa_buffer.Height-y),
2316 b->mesa_buffer.Width, 1,
2317 0,
2318 pixbuf );
2319
2320 /* write to XImage back buffer */
2321 for (x=0;x<b->mesa_buffer.Width;x++) {
2322 XMesaPutPixel(b->backimage,x,y,
2323 xmesa_color_to_pixel(xmesa,
2324 (pixbuf[x] & 0xf800) >> 8,
2325 (pixbuf[x] & 0x07e0) >> 3,
2326 (pixbuf[x] & 0x001f) << 3,
2327 0xff,
2328 b->xm_visual->undithered_pf));
2329 }
2330 }
2331 }
2332 /* grLfbWriteColorFormat(GR_COLORFORMAT_ABGR); */
2333 }
2334 #endif
2335
2336
2337 /*
2338 * Copy the back buffer to the front buffer. If there's no back buffer
2339 * this is a no-op.
2340 */
2341 void XMesaSwapBuffers( XMesaBuffer b )
2342 {
2343 GET_CURRENT_CONTEXT(ctx);
2344
2345 /* If we're swapping the buffer associated with the current context
2346 * we have to flush any pending rendering commands first.
2347 */
2348 if (ctx && ctx->DrawBuffer == &(b->mesa_buffer))
2349 _mesa_notifySwapBuffers(ctx);
2350
2351 if (b->db_state) {
2352 #ifdef FX
2353 if (b->FXctx) {
2354 fxMesaSwapBuffers();
2355
2356 if (b->FXwindowHack)
2357 FXgetImage(b);
2358 else
2359 return;
2360 }
2361 #endif
2362 if (b->backimage) {
2363 /* Copy Ximage from host's memory to server's window */
2364 #if defined(USE_XSHM) && !defined(XFree86Server)
2365 if (b->shm) {
2366 /*_glthread_LOCK_MUTEX(_xmesa_lock);*/
2367 XShmPutImage( b->xm_visual->display, b->frontbuffer,
2368 b->swapgc,
2369 b->backimage, 0, 0,
2370 0, 0, b->mesa_buffer.Width, b->mesa_buffer.Height,
2371 False );
2372 /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/
2373 }
2374 else
2375 #endif
2376 {
2377 /*_glthread_LOCK_MUTEX(_xmesa_lock);*/
2378 XMesaPutImage( b->xm_visual->display, b->frontbuffer,
2379 b->swapgc,
2380 b->backimage, 0, 0,
2381 0, 0, b->mesa_buffer.Width, b->mesa_buffer.Height );
2382 /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/
2383 }
2384 }
2385 else {
2386 /* Copy pixmap to window on server */
2387 /*_glthread_LOCK_MUTEX(_xmesa_lock);*/
2388 XMesaCopyArea( b->xm_visual->display,
2389 b->backpixmap, /* source drawable */
2390 b->frontbuffer, /* dest. drawable */
2391 b->swapgc,
2392 0, 0, b->mesa_buffer.Width, b->mesa_buffer.Height,
2393 0, 0 /* dest region */
2394 );
2395 /*_glthread_UNLOCK_MUTEX(_xmesa_lock);*/
2396 }
2397 }
2398 #if !defined(XFree86Server)
2399 XSync( b->xm_visual->display, False );
2400 #endif
2401 }
2402
2403
2404
2405 /*
2406 * Copy sub-region of back buffer to front buffer
2407 */
2408 void XMesaCopySubBuffer( XMesaBuffer b, int x, int y, int width, int height )
2409 {
2410 GET_CURRENT_CONTEXT(ctx);
2411
2412 /* If we're swapping the buffer associated with the current context
2413 * we have to flush any pending rendering commands first.
2414 */
2415 if (ctx && ctx->DrawBuffer == &(b->mesa_buffer))
2416 _mesa_notifySwapBuffers(ctx);
2417
2418 if (b->db_state) {
2419 int yTop = b->mesa_buffer.Height - y - height;
2420 #ifdef FX
2421 if (b->FXctx) {
2422 fxMesaSwapBuffers();
2423 if (b->FXwindowHack)
2424 FXgetImage(b);
2425 else
2426 return;
2427 }
2428 #endif
2429 if (b->backimage) {
2430 /* Copy Ximage from host's memory to server's window */
2431 #if defined(USE_XSHM) && !defined(XFree86Server)
2432 if (b->shm) {
2433 /* XXX assuming width and height aren't too large! */
2434 XShmPutImage( b->xm_visual->display, b->frontbuffer,
2435 b->swapgc,
2436 b->backimage, x, yTop,
2437 x, yTop, width, height, False );
2438 /* wait for finished event??? */
2439 }
2440 else
2441 #endif
2442 {
2443 /* XXX assuming width and height aren't too large! */
2444 XMesaPutImage( b->xm_visual->display, b->frontbuffer,
2445 b->swapgc,
2446 b->backimage, x, yTop,
2447 x, yTop, width, height );
2448 }
2449 }
2450 else {
2451 /* Copy pixmap to window on server */
2452 XMesaCopyArea( b->xm_visual->display,
2453 b->backpixmap, /* source drawable */
2454 b->frontbuffer, /* dest. drawable */
2455 b->swapgc,
2456 x, yTop, width, height, /* source region */
2457 x, yTop /* dest region */
2458 );
2459 }
2460 }
2461 }
2462
2463
2464 /*
2465 * Return a pointer to the XMesa backbuffer Pixmap or XImage. This function
2466 * is a way to get "under the hood" of X/Mesa so one can manipulate the
2467 * back buffer directly.
2468 * Output: pixmap - pointer to back buffer's Pixmap, or 0
2469 * ximage - pointer to back buffer's XImage, or NULL
2470 * Return: GL_TRUE = context is double buffered
2471 * GL_FALSE = context is single buffered
2472 */
2473 GLboolean XMesaGetBackBuffer( XMesaBuffer b,
2474 XMesaPixmap *pixmap,
2475 XMesaImage **ximage )
2476 {
2477 if (b->db_state) {
2478 if (pixmap) *pixmap = b->backpixmap;
2479 if (ximage) *ximage = b->backimage;
2480 return GL_TRUE;
2481 }
2482 else {
2483 *pixmap = 0;
2484 *ximage = NULL;
2485 return GL_FALSE;
2486 }
2487 }
2488
2489
2490 /*
2491 * Return the depth buffer associated with an XMesaBuffer.
2492 * Input: b - the XMesa buffer handle
2493 * Output: width, height - size of buffer in pixels
2494 * bytesPerValue - bytes per depth value (2 or 4)
2495 * buffer - pointer to depth buffer values
2496 * Return: GL_TRUE or GL_FALSE to indicate success or failure.
2497 */
2498 GLboolean XMesaGetDepthBuffer( XMesaBuffer b, GLint *width, GLint *height,
2499 GLint *bytesPerValue, void **buffer )
2500 {
2501 if (!b->mesa_buffer.DepthBuffer) {
2502 *width = 0;
2503 *height = 0;
2504 *bytesPerValue = 0;
2505 *buffer = 0;
2506 return GL_FALSE;
2507 }
2508 else {
2509 *width = b->mesa_buffer.Width;
2510 *height = b->mesa_buffer.Height;
2511 *bytesPerValue = sizeof(GLdepth);
2512 *buffer = b->mesa_buffer.DepthBuffer;
2513 return GL_TRUE;
2514 }
2515 }
2516
2517
2518 void XMesaFlush( XMesaContext c )
2519 {
2520 if (c && c->xm_visual) {
2521 #ifdef XFree86Server
2522 /* NOT_NEEDED */
2523 #else
2524 XSync( c->xm_visual->display, False );
2525 #endif
2526 }
2527 }
2528
2529
2530
2531 const char *XMesaGetString( XMesaContext c, int name )
2532 {
2533 (void) c;
2534 if (name==XMESA_VERSION) {
2535 return "5.0";
2536 }
2537 else if (name==XMESA_EXTENSIONS) {
2538 return "";
2539 }
2540 else {
2541 return NULL;
2542 }
2543 }
2544
2545
2546
2547 XMesaBuffer XMesaFindBuffer( XMesaDisplay *dpy, XMesaDrawable d )
2548 {
2549 XMesaBuffer b;
2550 for (b=XMesaBufferList; b; b=b->Next) {
2551 if (b->frontbuffer==d && b->display==dpy) {
2552 return b;
2553 }
2554 }
2555 return NULL;
2556 }
2557
2558
2559
2560 /*
2561 * Look for XMesaBuffers whose X window has been destroyed.
2562 * Deallocate any such XMesaBuffers.
2563 */
2564 void XMesaGarbageCollect( void )
2565 {
2566 XMesaBuffer b, next;
2567 for (b=XMesaBufferList; b; b=next) {
2568 next = b->Next;
2569 if (b->display && b->frontbuffer && b->type == WINDOW) {
2570 #ifdef XFree86Server
2571 /* NOT_NEEDED */
2572 #else
2573 XSync(b->display, False);
2574 if (!window_exists( b->display, b->frontbuffer )) {
2575 /* found a dead window, free the ancillary info */
2576 XMesaDestroyBuffer( b );
2577 }
2578 #endif
2579 }
2580 }
2581 }
2582
2583
2584 void XMesaReset( void )
2585 {
2586 while (XMesaBufferList)
2587 XMesaDestroyBuffer(XMesaBufferList);
2588
2589 XMesaBufferList = NULL;
2590 }
2591
2592
2593 unsigned long XMesaDitherColor( XMesaContext xmesa, GLint x, GLint y,
2594 GLfloat red, GLfloat green,
2595 GLfloat blue, GLfloat alpha )
2596 {
2597 GLint r = (GLint) (red * 255.0F);
2598 GLint g = (GLint) (green * 255.0F);
2599 GLint b = (GLint) (blue * 255.0F);
2600 GLint a = (GLint) (alpha * 255.0F);
2601
2602 switch (xmesa->pixelformat) {
2603 case PF_Index:
2604 return 0;
2605 case PF_Truecolor:
2606 {
2607 unsigned long p;
2608 PACK_TRUECOLOR( p, r, g, b );
2609 return p;
2610 }
2611 case PF_8A8B8G8R:
2612 return PACK_8A8B8G8R( r, g, b, a );
2613 case PF_8R8G8B:
2614 return PACK_8R8G8B( r, g, b );
2615 case PF_5R6G5B:
2616 return PACK_5R6G5B( r, g, b );
2617 case PF_Dither:
2618 {
2619 DITHER_SETUP;
2620 return DITHER( x, y, r, g, b );
2621 }
2622 case PF_1Bit:
2623 /* 382 = (3*255)/2 */
2624 return ((r+g+b) > 382) ^ xmesa->xm_visual->bitFlip;
2625 case PF_HPCR:
2626 return DITHER_HPCR(x, y, r, g, b);
2627 case PF_Lookup:
2628 {
2629 LOOKUP_SETUP;
2630 return LOOKUP( r, g, b );
2631 }
2632 case PF_Grayscale:
2633 return GRAY_RGB( r, g, b );
2634 case PF_Dither_5R6G5B:
2635 /* fall through */
2636 case PF_Dither_True:
2637 {
2638 unsigned long p;
2639 PACK_TRUEDITHER(p, x, y, r, g, b);
2640 return p;
2641 }
2642 default:
2643 _mesa_problem(NULL, "Bad pixel format in XMesaDitherColor");
2644 }
2645 return 0;
2646 }
2647
2648
2649 /*
2650 * This is typically called when the window size changes and we need
2651 * to reallocate the buffer's back/depth/stencil/accum buffers.
2652 */
2653 void XMesaResizeBuffers( XMesaBuffer b )
2654 {
2655 xmesa_resize_buffers( &(b->mesa_buffer) );
2656
2657 }
2658