1 /*
2 * Mesa 3-D graphics library
3 *
4 * Copyright (C) 1999-2007 Brian Paul All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the "Software"),
8 * to deal in the Software without restriction, including without limitation
9 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
10 * and/or sell copies of the Software, and to permit persons to whom the
11 * Software is furnished to do so, subject to the following conditions:
12 *
13 * The above copyright notice and this permission notice shall be included
14 * in all copies or substantial portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
17 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
20 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
21 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
22 * OTHER DEALINGS IN THE SOFTWARE.
23 */
24
25 /**
26 * \file xm_api.c
27 *
28 * All the XMesa* API functions.
29 *
30 *
31 * NOTES:
32 *
33 * The window coordinate system origin (0,0) is in the lower-left corner
34 * of the window. X11's window coordinate origin is in the upper-left
35 * corner of the window. Therefore, most drawing functions in this
36 * file have to flip Y coordinates.
37 *
38 * Define USE_XSHM in the Makefile with -DUSE_XSHM if you want to compile
39 * in support for the MIT Shared Memory extension. If enabled, when you
40 * use an Ximage for the back buffer in double buffered mode, the "swap"
41 * operation will be faster. You must also link with -lXext.
42 *
43 * Byte swapping: If the Mesa host and the X display use a different
44 * byte order then there's some trickiness to be aware of when using
45 * XImages. The byte ordering used for the XImage is that of the X
46 * display, not the Mesa host.
47 * The color-to-pixel encoding for True/DirectColor must be done
48 * according to the display's visual red_mask, green_mask, and blue_mask.
49 * If XPutPixel is used to put a pixel into an XImage then XPutPixel will
50 * do byte swapping if needed. If one wants to directly "poke" the pixel
51 * into the XImage's buffer then the pixel must be byte swapped first. In
52 * Mesa, when byte swapping is needed we use the PF_TRUECOLOR pixel format
53 * and use XPutPixel everywhere except in the implementation of
54 * glClear(GL_COLOR_BUFFER_BIT). We want this function to be fast so
55 * instead of using XPutPixel we "poke" our values after byte-swapping
56 * the clear pixel value if needed.
57 *
58 */
59
60 #ifdef __CYGWIN__
61 #undef WIN32
62 #undef __WIN32__
63 #endif
64
65 #include <stdio.h>
66 #include "glxheader.h"
67 #include "xmesaP.h"
68 #include "main/api_exec.h"
69 #include "main/context.h"
70 #include "main/extensions.h"
71 #include "main/framebuffer.h"
72 #include "main/macros.h"
73 #include "main/renderbuffer.h"
74 #include "main/state.h"
75 #include "main/teximage.h"
76 #include "main/version.h"
77 #include "main/vtxfmt.h"
78 #include "swrast/swrast.h"
79 #include "swrast/s_renderbuffer.h"
80 #include "swrast_setup/swrast_setup.h"
81 #include "vbo/vbo.h"
82 #include "tnl/tnl.h"
83 #include "tnl/t_context.h"
84 #include "tnl/t_pipeline.h"
85 #include "drivers/common/driverfuncs.h"
86 #include "drivers/common/meta.h"
87 #include "util/u_memory.h"
88
89 /**
90 * Global X driver lock
91 */
92 mtx_t _xmesa_lock;
93
94
95
96 /**********************************************************************/
97 /***** X Utility Functions *****/
98 /**********************************************************************/
99
100
101 /**
102 * Return the host's byte order as LSBFirst or MSBFirst ala X.
103 */
host_byte_order(void)104 static int host_byte_order( void )
105 {
106 int i = 1;
107 char *cptr = (char *) &i;
108 return (*cptr==1) ? LSBFirst : MSBFirst;
109 }
110
111
112 /**
113 * Check if the X Shared Memory extension is available.
114 * Return: 0 = not available
115 * 1 = shared XImage support available
116 * 2 = shared Pixmap support available also
117 */
check_for_xshm(XMesaDisplay * display)118 static int check_for_xshm( XMesaDisplay *display )
119 {
120 #if defined(USE_XSHM)
121 int ignore;
122
123 if (XQueryExtension( display, "MIT-SHM", &ignore, &ignore, &ignore )) {
124 /* Note: we're no longer calling XShmQueryVersion() here. It seems
125 * to be flakey (triggers a spurious X protocol error when we close
126 * one display connection and start using a new one. XShm has been
127 * around a long time and hasn't changed so if MIT_SHM is supported
128 * we assume we're good to go.
129 */
130 return 2;
131 }
132 else {
133 return 0;
134 }
135 #else
136 /* No XSHM support */
137 return 0;
138 #endif
139 }
140
141
142 /**
143 * Apply gamma correction to an intensity value in [0..max]. Return the
144 * new intensity value.
145 */
146 static GLint
gamma_adjust(GLfloat gamma,GLint value,GLint max)147 gamma_adjust( GLfloat gamma, GLint value, GLint max )
148 {
149 if (gamma == 1.0) {
150 return value;
151 }
152 else {
153 double x = (double) value / (double) max;
154 return lroundf((GLfloat) max * pow(x, 1.0F/gamma));
155 }
156 }
157
158
159
160 /**
161 * Return the true number of bits per pixel for XImages.
162 * For example, if we request a 24-bit deep visual we may actually need/get
163 * 32bpp XImages. This function returns the appropriate bpp.
164 * Input: dpy - the X display
165 * visinfo - desribes the visual to be used for XImages
166 * Return: true number of bits per pixel for XImages
167 */
168 static int
bits_per_pixel(XMesaVisual xmv)169 bits_per_pixel( XMesaVisual xmv )
170 {
171 XMesaDisplay *dpy = xmv->display;
172 XMesaVisualInfo visinfo = xmv->visinfo;
173 XMesaImage *img;
174 int bitsPerPixel;
175 /* Create a temporary XImage */
176 img = XCreateImage( dpy, visinfo->visual, visinfo->depth,
177 ZPixmap, 0, /*format, offset*/
178 malloc(8), /*data*/
179 1, 1, /*width, height*/
180 32, /*bitmap_pad*/
181 0 /*bytes_per_line*/
182 );
183 assert(img);
184 /* grab the bits/pixel value */
185 bitsPerPixel = img->bits_per_pixel;
186 /* free the XImage */
187 free( img->data );
188 img->data = NULL;
189 XMesaDestroyImage( img );
190 return bitsPerPixel;
191 }
192
193
194
195 /*
196 * Determine if a given X window ID is valid (window exists).
197 * Do this by calling XGetWindowAttributes() for the window and
198 * checking if we catch an X error.
199 * Input: dpy - the display
200 * win - the window to check for existence
201 * Return: GL_TRUE - window exists
202 * GL_FALSE - window doesn't exist
203 */
204 static GLboolean WindowExistsFlag;
205
window_exists_err_handler(XMesaDisplay * dpy,XErrorEvent * xerr)206 static int window_exists_err_handler( XMesaDisplay* dpy, XErrorEvent* xerr )
207 {
208 (void) dpy;
209 if (xerr->error_code == BadWindow) {
210 WindowExistsFlag = GL_FALSE;
211 }
212 return 0;
213 }
214
window_exists(XMesaDisplay * dpy,Window win)215 static GLboolean window_exists( XMesaDisplay *dpy, Window win )
216 {
217 XWindowAttributes wa;
218 int (*old_handler)( XMesaDisplay*, XErrorEvent* );
219 WindowExistsFlag = GL_TRUE;
220 old_handler = XSetErrorHandler(window_exists_err_handler);
221 XGetWindowAttributes( dpy, win, &wa ); /* dummy request */
222 XSetErrorHandler(old_handler);
223 return WindowExistsFlag;
224 }
225
226 static Status
get_drawable_size(XMesaDisplay * dpy,Drawable d,GLuint * width,GLuint * height)227 get_drawable_size( XMesaDisplay *dpy, Drawable d, GLuint *width, GLuint *height )
228 {
229 Window root;
230 Status stat;
231 int xpos, ypos;
232 unsigned int w, h, bw, depth;
233 stat = XGetGeometry(dpy, d, &root, &xpos, &ypos, &w, &h, &bw, &depth);
234 *width = w;
235 *height = h;
236 return stat;
237 }
238
239
240 /**
241 * Return the size of the window (or pixmap) that corresponds to the
242 * given XMesaBuffer.
243 * \param width returns width in pixels
244 * \param height returns height in pixels
245 */
246 void
xmesa_get_window_size(XMesaDisplay * dpy,XMesaBuffer b,GLuint * width,GLuint * height)247 xmesa_get_window_size(XMesaDisplay *dpy, XMesaBuffer b,
248 GLuint *width, GLuint *height)
249 {
250 Status stat;
251
252 mtx_lock(&_xmesa_lock);
253 XSync(b->xm_visual->display, 0); /* added for Chromium */
254 stat = get_drawable_size(dpy, b->frontxrb->pixmap, width, height);
255 mtx_unlock(&_xmesa_lock);
256
257 if (!stat) {
258 /* probably querying a window that's recently been destroyed */
259 _mesa_warning(NULL, "XGetGeometry failed!\n");
260 *width = *height = 1;
261 }
262 }
263
264
265
266 /**********************************************************************/
267 /***** Linked list of XMesaBuffers *****/
268 /**********************************************************************/
269
270 XMesaBuffer XMesaBufferList = NULL;
271
272
273 /**
274 * Allocate a new XMesaBuffer object which corresponds to the given drawable.
275 * Note that XMesaBuffer is derived from struct gl_framebuffer.
276 * The new XMesaBuffer will not have any size (Width=Height=0).
277 *
278 * \param d the corresponding X drawable (window or pixmap)
279 * \param type either WINDOW, PIXMAP or PBUFFER, describing d
280 * \param vis the buffer's visual
281 * \param cmap the window's colormap, if known.
282 * \return new XMesaBuffer or NULL if any problem
283 */
284 static XMesaBuffer
create_xmesa_buffer(XMesaDrawable d,BufferType type,XMesaVisual vis,XMesaColormap cmap)285 create_xmesa_buffer(XMesaDrawable d, BufferType type,
286 XMesaVisual vis, XMesaColormap cmap)
287 {
288 XMesaBuffer b;
289
290 assert(type == WINDOW || type == PIXMAP || type == PBUFFER);
291
292 b = (XMesaBuffer) CALLOC_STRUCT(xmesa_buffer);
293 if (!b)
294 return NULL;
295
296 b->display = vis->display;
297 b->xm_visual = vis;
298 b->type = type;
299 b->cmap = cmap;
300
301 _mesa_initialize_window_framebuffer(&b->mesa_buffer, &vis->mesa_visual);
302 b->mesa_buffer.Delete = xmesa_delete_framebuffer;
303
304 /*
305 * Front renderbuffer
306 */
307 b->frontxrb = xmesa_new_renderbuffer(NULL, 0, vis, GL_FALSE);
308 if (!b->frontxrb) {
309 free(b);
310 return NULL;
311 }
312 b->frontxrb->Parent = b;
313 b->frontxrb->drawable = d;
314 b->frontxrb->pixmap = (XMesaPixmap) d;
315 _mesa_attach_and_own_rb(&b->mesa_buffer, BUFFER_FRONT_LEFT,
316 &b->frontxrb->Base.Base);
317
318 /*
319 * Back renderbuffer
320 */
321 if (vis->mesa_visual.doubleBufferMode) {
322 b->backxrb = xmesa_new_renderbuffer(NULL, 0, vis, GL_TRUE);
323 if (!b->backxrb) {
324 /* XXX free front xrb too */
325 free(b);
326 return NULL;
327 }
328 b->backxrb->Parent = b;
329 /* determine back buffer implementation */
330 b->db_mode = vis->ximage_flag ? BACK_XIMAGE : BACK_PIXMAP;
331
332 _mesa_attach_and_own_rb(&b->mesa_buffer, BUFFER_BACK_LEFT,
333 &b->backxrb->Base.Base);
334 }
335
336 /*
337 * Other renderbuffer (depth, stencil, etc)
338 */
339 _swrast_add_soft_renderbuffers(&b->mesa_buffer,
340 GL_FALSE, /* color */
341 vis->mesa_visual.depthBits > 0,
342 vis->mesa_visual.stencilBits > 0,
343 vis->mesa_visual.accumRedBits > 0,
344 GL_FALSE /* software alpha buffer */ );
345
346 /* GLX_EXT_texture_from_pixmap */
347 b->TextureTarget = 0;
348 b->TextureFormat = GLX_TEXTURE_FORMAT_NONE_EXT;
349 b->TextureMipmap = 0;
350
351 /* insert buffer into linked list */
352 b->Next = XMesaBufferList;
353 XMesaBufferList = b;
354
355 return b;
356 }
357
358
359 /**
360 * Find an XMesaBuffer by matching X display and colormap but NOT matching
361 * the notThis buffer.
362 */
363 XMesaBuffer
xmesa_find_buffer(XMesaDisplay * dpy,XMesaColormap cmap,XMesaBuffer notThis)364 xmesa_find_buffer(XMesaDisplay *dpy, XMesaColormap cmap, XMesaBuffer notThis)
365 {
366 XMesaBuffer b;
367 for (b=XMesaBufferList; b; b=b->Next) {
368 if (b->display==dpy && b->cmap==cmap && b!=notThis) {
369 return b;
370 }
371 }
372 return NULL;
373 }
374
375
376 /**
377 * Remove buffer from linked list, delete if no longer referenced.
378 */
379 static void
xmesa_free_buffer(XMesaBuffer buffer)380 xmesa_free_buffer(XMesaBuffer buffer)
381 {
382 XMesaBuffer prev = NULL, b;
383
384 for (b = XMesaBufferList; b; b = b->Next) {
385 if (b == buffer) {
386 struct gl_framebuffer *fb = &buffer->mesa_buffer;
387
388 /* unlink buffer from list */
389 if (prev)
390 prev->Next = buffer->Next;
391 else
392 XMesaBufferList = buffer->Next;
393
394 /* mark as delete pending */
395 fb->DeletePending = GL_TRUE;
396
397 /* Since the X window for the XMesaBuffer is going away, we don't
398 * want to dereference this pointer in the future.
399 */
400 b->frontxrb->drawable = 0;
401
402 /* Unreference. If count = zero we'll really delete the buffer */
403 _mesa_reference_framebuffer(&fb, NULL);
404
405 return;
406 }
407 /* continue search */
408 prev = b;
409 }
410 /* buffer not found in XMesaBufferList */
411 _mesa_problem(NULL,"xmesa_free_buffer() - buffer not found\n");
412 }
413
414
415
416
417 /**********************************************************************/
418 /***** Misc Private Functions *****/
419 /**********************************************************************/
420
421
422 /**
423 * Setup RGB rendering for a window with a True/DirectColor visual.
424 */
425 static void
setup_truecolor(XMesaVisual v,XMesaBuffer buffer,XMesaColormap cmap)426 setup_truecolor(XMesaVisual v, XMesaBuffer buffer, XMesaColormap cmap)
427 {
428 unsigned long rmask, gmask, bmask;
429 (void) buffer;
430 (void) cmap;
431
432 /* Compute red multiplier (mask) and bit shift */
433 v->rshift = 0;
434 rmask = GET_REDMASK(v);
435 while ((rmask & 1)==0) {
436 v->rshift++;
437 rmask = rmask >> 1;
438 }
439
440 /* Compute green multiplier (mask) and bit shift */
441 v->gshift = 0;
442 gmask = GET_GREENMASK(v);
443 while ((gmask & 1)==0) {
444 v->gshift++;
445 gmask = gmask >> 1;
446 }
447
448 /* Compute blue multiplier (mask) and bit shift */
449 v->bshift = 0;
450 bmask = GET_BLUEMASK(v);
451 while ((bmask & 1)==0) {
452 v->bshift++;
453 bmask = bmask >> 1;
454 }
455
456 /*
457 * Compute component-to-pixel lookup tables and dithering kernel
458 */
459 {
460 static GLubyte kernel[16] = {
461 0*16, 8*16, 2*16, 10*16,
462 12*16, 4*16, 14*16, 6*16,
463 3*16, 11*16, 1*16, 9*16,
464 15*16, 7*16, 13*16, 5*16,
465 };
466 GLint rBits = util_bitcount(rmask);
467 GLint gBits = util_bitcount(gmask);
468 GLint bBits = util_bitcount(bmask);
469 GLint maxBits;
470 GLuint i;
471
472 /* convert pixel components in [0,_mask] to RGB values in [0,255] */
473 for (i=0; i<=rmask; i++)
474 v->PixelToR[i] = (unsigned char) ((i * 255) / rmask);
475 for (i=0; i<=gmask; i++)
476 v->PixelToG[i] = (unsigned char) ((i * 255) / gmask);
477 for (i=0; i<=bmask; i++)
478 v->PixelToB[i] = (unsigned char) ((i * 255) / bmask);
479
480 /* convert RGB values from [0,255] to pixel components */
481
482 for (i=0;i<256;i++) {
483 GLint r = gamma_adjust(v->RedGamma, i, 255);
484 GLint g = gamma_adjust(v->GreenGamma, i, 255);
485 GLint b = gamma_adjust(v->BlueGamma, i, 255);
486 v->RtoPixel[i] = (r >> (8-rBits)) << v->rshift;
487 v->GtoPixel[i] = (g >> (8-gBits)) << v->gshift;
488 v->BtoPixel[i] = (b >> (8-bBits)) << v->bshift;
489 }
490 /* overflow protection */
491 for (i=256;i<512;i++) {
492 v->RtoPixel[i] = v->RtoPixel[255];
493 v->GtoPixel[i] = v->GtoPixel[255];
494 v->BtoPixel[i] = v->BtoPixel[255];
495 }
496
497 /* setup dithering kernel */
498 maxBits = rBits;
499 if (gBits > maxBits) maxBits = gBits;
500 if (bBits > maxBits) maxBits = bBits;
501 for (i=0;i<16;i++) {
502 v->Kernel[i] = kernel[i] >> maxBits;
503 }
504
505 v->undithered_pf = PF_Truecolor;
506 v->dithered_pf = (GET_VISUAL_DEPTH(v)<24) ? PF_Dither_True : PF_Truecolor;
507 }
508
509 /*
510 * Now check for TrueColor visuals which we can optimize.
511 */
512 if ( GET_REDMASK(v) ==0x0000ff
513 && GET_GREENMASK(v)==0x00ff00
514 && GET_BLUEMASK(v) ==0xff0000
515 && CHECK_BYTE_ORDER(v)
516 && v->BitsPerPixel==32
517 && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
518 /* common 32 bpp config used on SGI, Sun */
519 v->undithered_pf = v->dithered_pf = PF_8A8B8G8R; /* ABGR */
520 }
521 else if (GET_REDMASK(v) == 0xff0000
522 && GET_GREENMASK(v)== 0x00ff00
523 && GET_BLUEMASK(v) == 0x0000ff
524 && CHECK_BYTE_ORDER(v)
525 && v->RedGamma == 1.0 && v->GreenGamma == 1.0 && v->BlueGamma == 1.0){
526 if (v->BitsPerPixel==32) {
527 /* if 32 bpp, and visual indicates 8 bpp alpha channel */
528 if (GET_VISUAL_DEPTH(v) == 32 && v->mesa_visual.alphaBits == 8)
529 v->undithered_pf = v->dithered_pf = PF_8A8R8G8B; /* ARGB */
530 else
531 v->undithered_pf = v->dithered_pf = PF_8R8G8B; /* xRGB */
532 }
533 else if (v->BitsPerPixel == 24) {
534 v->undithered_pf = v->dithered_pf = PF_8R8G8B24; /* RGB */
535 }
536 }
537 else if (GET_REDMASK(v) ==0xf800
538 && GET_GREENMASK(v)==0x07e0
539 && GET_BLUEMASK(v) ==0x001f
540 && CHECK_BYTE_ORDER(v)
541 && v->BitsPerPixel==16
542 && v->RedGamma==1.0 && v->GreenGamma==1.0 && v->BlueGamma==1.0) {
543 /* 5-6-5 RGB */
544 v->undithered_pf = PF_5R6G5B;
545 v->dithered_pf = PF_Dither_5R6G5B;
546 }
547 }
548
549
550 /**
551 * When a context is bound for the first time, we can finally finish
552 * initializing the context's visual and buffer information.
553 * \param v the XMesaVisual to initialize
554 * \param b the XMesaBuffer to initialize (may be NULL)
555 * \param rgb_flag TRUE = RGBA mode, FALSE = color index mode
556 * \param window the window/pixmap we're rendering into
557 * \param cmap the colormap associated with the window/pixmap
558 * \return GL_TRUE=success, GL_FALSE=failure
559 */
560 static GLboolean
initialize_visual_and_buffer(XMesaVisual v,XMesaBuffer b,XMesaDrawable window,XMesaColormap cmap)561 initialize_visual_and_buffer(XMesaVisual v, XMesaBuffer b,
562 XMesaDrawable window,
563 XMesaColormap cmap)
564 {
565 const int xclass = v->visualType;
566
567
568 assert(!b || b->xm_visual == v);
569
570 /* Save true bits/pixel */
571 v->BitsPerPixel = bits_per_pixel(v);
572 assert(v->BitsPerPixel > 0);
573
574 /* RGB WINDOW:
575 * We support RGB rendering into almost any kind of visual.
576 */
577 if (xclass == GLX_TRUE_COLOR || xclass == GLX_DIRECT_COLOR) {
578 setup_truecolor( v, b, cmap );
579 }
580 else {
581 _mesa_warning(NULL, "XMesa: RGB mode rendering not supported in given visual.\n");
582 return GL_FALSE;
583 }
584
585 if (getenv("MESA_NO_DITHER")) {
586 v->dithered_pf = v->undithered_pf;
587 }
588
589
590 /*
591 * If MESA_INFO env var is set print out some debugging info
592 * which can help Brian figure out what's going on when a user
593 * reports bugs.
594 */
595 if (getenv("MESA_INFO")) {
596 printf("X/Mesa visual = %p\n", (void *) v);
597 printf("X/Mesa dithered pf = %u\n", v->dithered_pf);
598 printf("X/Mesa undithered pf = %u\n", v->undithered_pf);
599 printf("X/Mesa depth = %d\n", GET_VISUAL_DEPTH(v));
600 printf("X/Mesa bits per pixel = %d\n", v->BitsPerPixel);
601 }
602
603 if (b && window) {
604 /* Do window-specific initializations */
605
606 /* these should have been set in create_xmesa_buffer */
607 assert(b->frontxrb->drawable == window);
608 assert(b->frontxrb->pixmap == (XMesaPixmap) window);
609
610 /* Setup for single/double buffering */
611 if (v->mesa_visual.doubleBufferMode) {
612 /* Double buffered */
613 b->shm = check_for_xshm( v->display );
614 }
615
616 /* X11 graphics contexts */
617 b->gc = XCreateGC( v->display, window, 0, NULL );
618 XMesaSetFunction( v->display, b->gc, GXcopy );
619
620 /* cleargc - for glClear() */
621 b->cleargc = XCreateGC( v->display, window, 0, NULL );
622 XMesaSetFunction( v->display, b->cleargc, GXcopy );
623
624 /*
625 * Don't generate Graphics Expose/NoExpose events in swapbuffers().
626 * Patch contributed by Michael Pichler May 15, 1995.
627 */
628 {
629 XGCValues gcvalues;
630 gcvalues.graphics_exposures = False;
631 b->swapgc = XCreateGC(v->display, window,
632 GCGraphicsExposures, &gcvalues);
633 }
634 XMesaSetFunction( v->display, b->swapgc, GXcopy );
635 }
636
637 return GL_TRUE;
638 }
639
640
641
642 /*
643 * Convert an RGBA color to a pixel value.
644 */
645 unsigned long
xmesa_color_to_pixel(struct gl_context * ctx,GLubyte r,GLubyte g,GLubyte b,GLubyte a,GLuint pixelFormat)646 xmesa_color_to_pixel(struct gl_context *ctx,
647 GLubyte r, GLubyte g, GLubyte b, GLubyte a,
648 GLuint pixelFormat)
649 {
650 XMesaContext xmesa = XMESA_CONTEXT(ctx);
651 switch (pixelFormat) {
652 case PF_Truecolor:
653 {
654 unsigned long p;
655 PACK_TRUECOLOR( p, r, g, b );
656 return p;
657 }
658 case PF_8A8B8G8R:
659 return PACK_8A8B8G8R( r, g, b, a );
660 case PF_8A8R8G8B:
661 return PACK_8A8R8G8B( r, g, b, a );
662 case PF_8R8G8B:
663 FALLTHROUGH;
664 case PF_8R8G8B24:
665 return PACK_8R8G8B( r, g, b );
666 case PF_5R6G5B:
667 return PACK_5R6G5B( r, g, b );
668 case PF_Dither_True:
669 FALLTHROUGH;
670 case PF_Dither_5R6G5B:
671 {
672 unsigned long p;
673 PACK_TRUEDITHER(p, 1, 0, r, g, b);
674 return p;
675 }
676 default:
677 _mesa_problem(ctx, "Bad pixel format in xmesa_color_to_pixel");
678 }
679 return 0;
680 }
681
682
683 #define NUM_VISUAL_TYPES 6
684
685 /**
686 * Convert an X visual type to a GLX visual type.
687 *
688 * \param visualType X visual type (i.e., \c TrueColor, \c StaticGray, etc.)
689 * to be converted.
690 * \return If \c visualType is a valid X visual type, a GLX visual type will
691 * be returned. Otherwise \c GLX_NONE will be returned.
692 *
693 * \note
694 * This code was lifted directly from lib/GL/glx/glcontextmodes.c in the
695 * DRI CVS tree.
696 */
697 static GLint
xmesa_convert_from_x_visual_type(int visualType)698 xmesa_convert_from_x_visual_type( int visualType )
699 {
700 static const int glx_visual_types[ NUM_VISUAL_TYPES ] = {
701 GLX_STATIC_GRAY, GLX_GRAY_SCALE,
702 GLX_STATIC_COLOR, GLX_PSEUDO_COLOR,
703 GLX_TRUE_COLOR, GLX_DIRECT_COLOR
704 };
705
706 return ( (unsigned) visualType < NUM_VISUAL_TYPES )
707 ? glx_visual_types[ visualType ] : GLX_NONE;
708 }
709
710
711 /**********************************************************************/
712 /***** Public Functions *****/
713 /**********************************************************************/
714
715
716 /*
717 * Create a new X/Mesa visual.
718 * Input: display - X11 display
719 * visinfo - an XVisualInfo pointer
720 * rgb_flag - GL_TRUE = RGB mode,
721 * GL_FALSE = color index mode
722 * alpha_flag - alpha buffer requested?
723 * db_flag - GL_TRUE = double-buffered,
724 * GL_FALSE = single buffered
725 * stereo_flag - stereo visual?
726 * ximage_flag - GL_TRUE = use an XImage for back buffer,
727 * GL_FALSE = use an off-screen pixmap for back buffer
728 * depth_size - requested bits/depth values, or zero
729 * stencil_size - requested bits/stencil values, or zero
730 * accum_red_size - requested bits/red accum values, or zero
731 * accum_green_size - requested bits/green accum values, or zero
732 * accum_blue_size - requested bits/blue accum values, or zero
733 * accum_alpha_size - requested bits/alpha accum values, or zero
734 * num_samples - number of samples/pixel if multisampling, or zero
735 * level - visual level, usually 0
736 * visualCaveat - ala the GLX extension, usually GLX_NONE
737 * Return; a new XMesaVisual or 0 if error.
738 */
739 PUBLIC
XMesaCreateVisual(XMesaDisplay * display,XMesaVisualInfo visinfo,GLboolean rgb_flag,GLboolean alpha_flag,GLboolean db_flag,GLboolean stereo_flag,GLboolean ximage_flag,GLint depth_size,GLint stencil_size,GLint accum_red_size,GLint accum_green_size,GLint accum_blue_size,GLint accum_alpha_size,GLint num_samples,GLint level,GLint visualCaveat)740 XMesaVisual XMesaCreateVisual( XMesaDisplay *display,
741 XMesaVisualInfo visinfo,
742 GLboolean rgb_flag,
743 GLboolean alpha_flag,
744 GLboolean db_flag,
745 GLboolean stereo_flag,
746 GLboolean ximage_flag,
747 GLint depth_size,
748 GLint stencil_size,
749 GLint accum_red_size,
750 GLint accum_green_size,
751 GLint accum_blue_size,
752 GLint accum_alpha_size,
753 GLint num_samples,
754 GLint level,
755 GLint visualCaveat )
756 {
757 char *gamma;
758 XMesaVisual v;
759 GLint red_bits, green_bits, blue_bits, alpha_bits;
760
761 /* For debugging only */
762 if (getenv("MESA_XSYNC")) {
763 /* This makes debugging X easier.
764 * In your debugger, set a breakpoint on _XError to stop when an
765 * X protocol error is generated.
766 */
767 XSynchronize( display, 1 );
768 }
769
770 /* Color-index rendering not supported. */
771 if (!rgb_flag)
772 return NULL;
773
774 v = (XMesaVisual) CALLOC_STRUCT(xmesa_visual);
775 if (!v) {
776 return NULL;
777 }
778
779 v->display = display;
780
781 /* Save a copy of the XVisualInfo struct because the user may Xfree()
782 * the struct but we may need some of the information contained in it
783 * at a later time.
784 */
785 v->visinfo = malloc(sizeof(*visinfo));
786 if(!v->visinfo) {
787 free(v);
788 return NULL;
789 }
790 memcpy(v->visinfo, visinfo, sizeof(*visinfo));
791
792 /* check for MESA_GAMMA environment variable */
793 gamma = getenv("MESA_GAMMA");
794 if (gamma) {
795 v->RedGamma = v->GreenGamma = v->BlueGamma = 0.0;
796 sscanf( gamma, "%f %f %f", &v->RedGamma, &v->GreenGamma, &v->BlueGamma );
797 if (v->RedGamma<=0.0) v->RedGamma = 1.0;
798 if (v->GreenGamma<=0.0) v->GreenGamma = v->RedGamma;
799 if (v->BlueGamma<=0.0) v->BlueGamma = v->RedGamma;
800 }
801 else {
802 v->RedGamma = v->GreenGamma = v->BlueGamma = 1.0;
803 }
804
805 v->ximage_flag = ximage_flag;
806
807 v->mesa_visual.redMask = visinfo->red_mask;
808 v->mesa_visual.greenMask = visinfo->green_mask;
809 v->mesa_visual.blueMask = visinfo->blue_mask;
810 v->visualID = visinfo->visualid;
811 v->screen = visinfo->screen;
812
813 #if !(defined(__cplusplus) || defined(c_plusplus))
814 v->visualType = xmesa_convert_from_x_visual_type(visinfo->class);
815 #else
816 v->visualType = xmesa_convert_from_x_visual_type(visinfo->c_class);
817 #endif
818
819 if (alpha_flag)
820 v->mesa_visual.alphaBits = 8;
821
822 (void) initialize_visual_and_buffer( v, NULL, 0, 0 );
823
824 {
825 const int xclass = v->visualType;
826 if (xclass == GLX_TRUE_COLOR || xclass == GLX_DIRECT_COLOR) {
827 red_bits = util_bitcount(GET_REDMASK(v));
828 green_bits = util_bitcount(GET_GREENMASK(v));
829 blue_bits = util_bitcount(GET_BLUEMASK(v));
830 }
831 else {
832 /* this is an approximation */
833 int depth;
834 depth = GET_VISUAL_DEPTH(v);
835 red_bits = depth / 3;
836 depth -= red_bits;
837 green_bits = depth / 2;
838 depth -= green_bits;
839 blue_bits = depth;
840 alpha_bits = 0;
841 assert( red_bits + green_bits + blue_bits == GET_VISUAL_DEPTH(v) );
842 }
843 alpha_bits = v->mesa_visual.alphaBits;
844 }
845
846 _mesa_initialize_visual(&v->mesa_visual,
847 db_flag, stereo_flag,
848 red_bits, green_bits,
849 blue_bits, alpha_bits,
850 depth_size,
851 stencil_size,
852 accum_red_size, accum_green_size,
853 accum_blue_size, accum_alpha_size,
854 0);
855
856 return v;
857 }
858
859
860 PUBLIC
XMesaDestroyVisual(XMesaVisual v)861 void XMesaDestroyVisual( XMesaVisual v )
862 {
863 free(v->visinfo);
864 free(v);
865 }
866
867
868
869 /**
870 * Create a new XMesaContext.
871 * \param v the XMesaVisual
872 * \param share_list another XMesaContext with which to share display
873 * lists or NULL if no sharing is wanted.
874 * \return an XMesaContext or NULL if error.
875 */
876 PUBLIC
XMesaCreateContext(XMesaVisual v,XMesaContext share_list)877 XMesaContext XMesaCreateContext( XMesaVisual v, XMesaContext share_list )
878 {
879 static GLboolean firstTime = GL_TRUE;
880 XMesaContext c;
881 struct gl_context *mesaCtx;
882 struct dd_function_table functions;
883 TNLcontext *tnl;
884
885 if (firstTime) {
886 mtx_init(&_xmesa_lock, mtx_plain);
887 firstTime = GL_FALSE;
888 }
889
890 /* Note: the XMesaContext contains a Mesa struct gl_context struct (inheritance) */
891 c = (XMesaContext) CALLOC_STRUCT(xmesa_context);
892 if (!c)
893 return NULL;
894
895 mesaCtx = &(c->mesa);
896
897 /* initialize with default driver functions, then plug in XMesa funcs */
898 _mesa_init_driver_functions(&functions);
899 _tnl_init_driver_draw_function(&functions);
900 xmesa_init_driver_functions(v, &functions);
901 if (!_mesa_initialize_context(mesaCtx, API_OPENGL_COMPAT, &v->mesa_visual,
902 share_list ? &(share_list->mesa) : (struct gl_context *) NULL,
903 &functions)) {
904 free(c);
905 return NULL;
906 }
907
908 /* Enable this to exercise fixed function -> shader translation
909 * with software rendering.
910 */
911 if (0) {
912 mesaCtx->VertexProgram._MaintainTnlProgram = GL_TRUE;
913 mesaCtx->FragmentProgram._MaintainTexEnvProgram = GL_TRUE;
914 _mesa_reset_vertex_processing_mode(mesaCtx);
915 }
916
917 _mesa_enable_sw_extensions(mesaCtx);
918
919 #if ENABLE_EXT_timer_query
920 mesaCtx->Extensions.EXT_timer_query = GL_TRUE;
921 #endif
922
923
924 /* finish up xmesa context initializations */
925 c->direct = GL_TRUE;
926 c->swapbytes = CHECK_BYTE_ORDER(v) ? GL_FALSE : GL_TRUE;
927 c->xm_visual = v;
928 c->xm_buffer = NULL; /* set later by XMesaMakeCurrent */
929 c->display = v->display;
930 c->pixelformat = v->dithered_pf; /* Dithering is enabled by default */
931
932 /* Initialize the software rasterizer and helper modules.
933 */
934 if (!_swrast_CreateContext( mesaCtx ) ||
935 !_vbo_CreateContext( mesaCtx, false ) ||
936 !_tnl_CreateContext( mesaCtx ) ||
937 !_swsetup_CreateContext( mesaCtx )) {
938 _mesa_free_context_data(&c->mesa, true);
939 free(c);
940 return NULL;
941 }
942
943 /* tnl setup */
944 tnl = TNL_CONTEXT(mesaCtx);
945 tnl->Driver.RunPipeline = _tnl_run_pipeline;
946 /* swrast setup */
947 xmesa_register_swrast_functions( mesaCtx );
948 _swsetup_Wakeup(mesaCtx);
949
950 _mesa_meta_init(mesaCtx);
951
952 _mesa_override_extensions(mesaCtx);
953 _mesa_compute_version(mesaCtx);
954
955 /* Exec table initialization requires the version to be computed */
956 _mesa_initialize_dispatch_tables(mesaCtx);
957 _mesa_initialize_vbo_vtxfmt(mesaCtx);
958
959 return c;
960 }
961
962
963
964 PUBLIC
XMesaDestroyContext(XMesaContext c)965 void XMesaDestroyContext( XMesaContext c )
966 {
967 struct gl_context *mesaCtx = &c->mesa;
968
969 _mesa_meta_free( mesaCtx );
970
971 _swsetup_DestroyContext( mesaCtx );
972 _swrast_DestroyContext( mesaCtx );
973 _tnl_DestroyContext( mesaCtx );
974 _vbo_DestroyContext( mesaCtx );
975 _mesa_free_context_data(mesaCtx, true);
976 free( c );
977 }
978
979
980
981 /**
982 * Private function for creating an XMesaBuffer which corresponds to an
983 * X window or pixmap.
984 * \param v the window's XMesaVisual
985 * \param w the window we're wrapping
986 * \return new XMesaBuffer or NULL if error
987 */
988 PUBLIC XMesaBuffer
XMesaCreateWindowBuffer(XMesaVisual v,XMesaWindow w)989 XMesaCreateWindowBuffer(XMesaVisual v, XMesaWindow w)
990 {
991 XWindowAttributes attr;
992 XMesaBuffer b;
993 XMesaColormap cmap;
994 int depth;
995
996 assert(v);
997 assert(w);
998
999 /* Check that window depth matches visual depth */
1000 XGetWindowAttributes( v->display, w, &attr );
1001 depth = attr.depth;
1002 if (GET_VISUAL_DEPTH(v) != depth) {
1003 _mesa_warning(NULL, "XMesaCreateWindowBuffer: depth mismatch between visual (%d) and window (%d)!\n",
1004 GET_VISUAL_DEPTH(v), depth);
1005 return NULL;
1006 }
1007
1008 /* Find colormap */
1009 if (attr.colormap) {
1010 cmap = attr.colormap;
1011 }
1012 else {
1013 _mesa_warning(NULL, "Window %u has no colormap!\n", (unsigned int) w);
1014 /* this is weird, a window w/out a colormap!? */
1015 /* OK, let's just allocate a new one and hope for the best */
1016 cmap = XCreateColormap(v->display, w, attr.visual, AllocNone);
1017 }
1018
1019 b = create_xmesa_buffer((XMesaDrawable) w, WINDOW, v, cmap);
1020 if (!b)
1021 return NULL;
1022
1023 if (!initialize_visual_and_buffer( v, b, (XMesaDrawable) w, cmap )) {
1024 xmesa_free_buffer(b);
1025 return NULL;
1026 }
1027
1028 return b;
1029 }
1030
1031
1032
1033 /**
1034 * Create a new XMesaBuffer from an X pixmap.
1035 *
1036 * \param v the XMesaVisual
1037 * \param p the pixmap
1038 * \param cmap the colormap, may be 0 if using a \c GLX_TRUE_COLOR or
1039 * \c GLX_DIRECT_COLOR visual for the pixmap
1040 * \returns new XMesaBuffer or NULL if error
1041 */
1042 PUBLIC XMesaBuffer
XMesaCreatePixmapBuffer(XMesaVisual v,XMesaPixmap p,XMesaColormap cmap)1043 XMesaCreatePixmapBuffer(XMesaVisual v, XMesaPixmap p, XMesaColormap cmap)
1044 {
1045 XMesaBuffer b;
1046
1047 assert(v);
1048
1049 b = create_xmesa_buffer((XMesaDrawable) p, PIXMAP, v, cmap);
1050 if (!b)
1051 return NULL;
1052
1053 if (!initialize_visual_and_buffer(v, b, (XMesaDrawable) p, cmap)) {
1054 xmesa_free_buffer(b);
1055 return NULL;
1056 }
1057
1058 return b;
1059 }
1060
1061
1062 /**
1063 * For GLX_EXT_texture_from_pixmap
1064 */
1065 XMesaBuffer
XMesaCreatePixmapTextureBuffer(XMesaVisual v,XMesaPixmap p,XMesaColormap cmap,int format,int target,int mipmap)1066 XMesaCreatePixmapTextureBuffer(XMesaVisual v, XMesaPixmap p,
1067 XMesaColormap cmap,
1068 int format, int target, int mipmap)
1069 {
1070 GET_CURRENT_CONTEXT(ctx);
1071 XMesaBuffer b;
1072 GLuint width, height;
1073
1074 assert(v);
1075
1076 b = create_xmesa_buffer((XMesaDrawable) p, PIXMAP, v, cmap);
1077 if (!b)
1078 return NULL;
1079
1080 /* get pixmap size, update framebuffer/renderbuffer dims */
1081 xmesa_get_window_size(v->display, b, &width, &height);
1082 _mesa_resize_framebuffer(NULL, &(b->mesa_buffer), width, height);
1083
1084 if (target == 0) {
1085 /* examine dims */
1086 if (ctx->Extensions.ARB_texture_non_power_of_two) {
1087 target = GLX_TEXTURE_2D_EXT;
1088 }
1089 else if ( util_bitcount(width) == 1
1090 && util_bitcount(height) == 1) {
1091 /* power of two size */
1092 if (height == 1) {
1093 target = GLX_TEXTURE_1D_EXT;
1094 }
1095 else {
1096 target = GLX_TEXTURE_2D_EXT;
1097 }
1098 }
1099 else if (ctx->Extensions.NV_texture_rectangle) {
1100 target = GLX_TEXTURE_RECTANGLE_EXT;
1101 }
1102 else {
1103 /* non power of two textures not supported */
1104 XMesaDestroyBuffer(b);
1105 return 0;
1106 }
1107 }
1108
1109 b->TextureTarget = target;
1110 b->TextureFormat = format;
1111 b->TextureMipmap = mipmap;
1112
1113 if (!initialize_visual_and_buffer(v, b, (XMesaDrawable) p, cmap)) {
1114 xmesa_free_buffer(b);
1115 return NULL;
1116 }
1117
1118 return b;
1119 }
1120
1121
1122
1123 XMesaBuffer
XMesaCreatePBuffer(XMesaVisual v,XMesaColormap cmap,unsigned int width,unsigned int height)1124 XMesaCreatePBuffer(XMesaVisual v, XMesaColormap cmap,
1125 unsigned int width, unsigned int height)
1126 {
1127 XMesaWindow root;
1128 XMesaDrawable drawable; /* X Pixmap Drawable */
1129 XMesaBuffer b;
1130
1131 /* allocate pixmap for front buffer */
1132 root = RootWindow( v->display, v->visinfo->screen );
1133 drawable = XCreatePixmap(v->display, root, width, height,
1134 v->visinfo->depth);
1135 if (!drawable)
1136 return NULL;
1137
1138 b = create_xmesa_buffer(drawable, PBUFFER, v, cmap);
1139 if (!b)
1140 return NULL;
1141
1142 if (!initialize_visual_and_buffer(v, b, drawable, cmap)) {
1143 xmesa_free_buffer(b);
1144 return NULL;
1145 }
1146
1147 return b;
1148 }
1149
1150
1151
1152 /*
1153 * Deallocate an XMesaBuffer structure and all related info.
1154 */
1155 PUBLIC void
XMesaDestroyBuffer(XMesaBuffer b)1156 XMesaDestroyBuffer(XMesaBuffer b)
1157 {
1158 xmesa_free_buffer(b);
1159 }
1160
1161
1162 /**
1163 * Query the current window size and update the corresponding struct gl_framebuffer
1164 * and all attached renderbuffers.
1165 * Called when:
1166 * 1. the first time a buffer is bound to a context.
1167 * 2. from glViewport to poll for window size changes
1168 * 3. from the XMesaResizeBuffers() API function.
1169 * Note: it's possible (and legal) for xmctx to be NULL. That can happen
1170 * when resizing a buffer when no rendering context is bound.
1171 */
1172 void
xmesa_check_and_update_buffer_size(XMesaContext xmctx,XMesaBuffer drawBuffer)1173 xmesa_check_and_update_buffer_size(XMesaContext xmctx, XMesaBuffer drawBuffer)
1174 {
1175 GLuint width, height;
1176 xmesa_get_window_size(drawBuffer->display, drawBuffer, &width, &height);
1177 if (drawBuffer->mesa_buffer.Width != width ||
1178 drawBuffer->mesa_buffer.Height != height) {
1179 struct gl_context *ctx = xmctx ? &xmctx->mesa : NULL;
1180 _mesa_resize_framebuffer(ctx, &(drawBuffer->mesa_buffer), width, height);
1181 }
1182 }
1183
1184
1185 /*
1186 * Bind buffer b to context c and make c the current rendering context.
1187 */
XMesaMakeCurrent(XMesaContext c,XMesaBuffer b)1188 GLboolean XMesaMakeCurrent( XMesaContext c, XMesaBuffer b )
1189 {
1190 return XMesaMakeCurrent2( c, b, b );
1191 }
1192
1193
1194 /*
1195 * Bind buffer b to context c and make c the current rendering context.
1196 */
1197 PUBLIC
XMesaMakeCurrent2(XMesaContext c,XMesaBuffer drawBuffer,XMesaBuffer readBuffer)1198 GLboolean XMesaMakeCurrent2( XMesaContext c, XMesaBuffer drawBuffer,
1199 XMesaBuffer readBuffer )
1200 {
1201 if (c) {
1202 if (!drawBuffer || !readBuffer)
1203 return GL_FALSE; /* must specify buffers! */
1204
1205 if (&(c->mesa) == _mesa_get_current_context()
1206 && c->mesa.DrawBuffer == &drawBuffer->mesa_buffer
1207 && c->mesa.ReadBuffer == &readBuffer->mesa_buffer
1208 && XMESA_BUFFER(c->mesa.DrawBuffer)->wasCurrent) {
1209 /* same context and buffer, do nothing */
1210 return GL_TRUE;
1211 }
1212
1213 c->xm_buffer = drawBuffer;
1214
1215 xmesa_check_and_update_buffer_size(c, drawBuffer);
1216 if (readBuffer != drawBuffer)
1217 xmesa_check_and_update_buffer_size(c, readBuffer);
1218
1219 _mesa_make_current(&(c->mesa),
1220 &drawBuffer->mesa_buffer,
1221 &readBuffer->mesa_buffer);
1222
1223 /*
1224 * Must recompute and set these pixel values because colormap
1225 * can be different for different windows.
1226 */
1227 c->clearpixel = xmesa_color_to_pixel( &c->mesa,
1228 c->clearcolor[0],
1229 c->clearcolor[1],
1230 c->clearcolor[2],
1231 c->clearcolor[3],
1232 c->xm_visual->undithered_pf);
1233 XMesaSetForeground(c->display, drawBuffer->cleargc, c->clearpixel);
1234
1235 /* Solution to Stephane Rehel's problem with glXReleaseBuffersMESA(): */
1236 drawBuffer->wasCurrent = GL_TRUE;
1237 }
1238 else {
1239 /* Detach */
1240 _mesa_make_current( NULL, NULL, NULL );
1241 }
1242 return GL_TRUE;
1243 }
1244
1245
1246 /*
1247 * Unbind the context c from its buffer.
1248 */
XMesaUnbindContext(XMesaContext c)1249 GLboolean XMesaUnbindContext( XMesaContext c )
1250 {
1251 /* A no-op for XFree86 integration purposes */
1252 return GL_TRUE;
1253 }
1254
1255
XMesaGetCurrentContext(void)1256 XMesaContext XMesaGetCurrentContext( void )
1257 {
1258 GET_CURRENT_CONTEXT(ctx);
1259 if (ctx) {
1260 XMesaContext xmesa = XMESA_CONTEXT(ctx);
1261 return xmesa;
1262 }
1263 else {
1264 return 0;
1265 }
1266 }
1267
1268
XMesaGetCurrentBuffer(void)1269 XMesaBuffer XMesaGetCurrentBuffer( void )
1270 {
1271 GET_CURRENT_CONTEXT(ctx);
1272 if (ctx) {
1273 XMesaBuffer xmbuf = XMESA_BUFFER(ctx->DrawBuffer);
1274 return xmbuf;
1275 }
1276 else {
1277 return 0;
1278 }
1279 }
1280
1281
1282 /* New in Mesa 3.1 */
XMesaGetCurrentReadBuffer(void)1283 XMesaBuffer XMesaGetCurrentReadBuffer( void )
1284 {
1285 GET_CURRENT_CONTEXT(ctx);
1286 if (ctx) {
1287 return XMESA_BUFFER(ctx->ReadBuffer);
1288 }
1289 else {
1290 return 0;
1291 }
1292 }
1293
1294
XMesaGetCurrentDisplay(void)1295 Display *XMesaGetCurrentDisplay(void)
1296 {
1297 GET_CURRENT_CONTEXT(ctx);
1298 XMesaContext xmctx = XMESA_CONTEXT(ctx);
1299 return xmctx ? xmctx->display : NULL;
1300 }
1301
1302
1303 /**
1304 * Swap buffers notification callback.
1305 *
1306 * \param ctx GL context.
1307 *
1308 * Called by window system just before swapping buffers.
1309 * We have to finish any pending rendering.
1310 */
1311 static void
XMesaNotifySwapBuffers(struct gl_context * ctx)1312 XMesaNotifySwapBuffers(struct gl_context *ctx)
1313 {
1314 if (MESA_VERBOSE & VERBOSE_SWAPBUFFERS)
1315 _mesa_debug(ctx, "SwapBuffers\n");
1316
1317 FLUSH_VERTICES(ctx, 0, 0);
1318 if (ctx->Driver.Flush) {
1319 ctx->Driver.Flush(ctx, 0);
1320 }
1321 }
1322
1323
1324 /*
1325 * Copy the back buffer to the front buffer. If there's no back buffer
1326 * this is a no-op.
1327 */
1328 PUBLIC
XMesaSwapBuffers(XMesaBuffer b)1329 void XMesaSwapBuffers( XMesaBuffer b )
1330 {
1331 GET_CURRENT_CONTEXT(ctx);
1332
1333 if (!b->backxrb) {
1334 /* single buffered */
1335 return;
1336 }
1337
1338 /* If we're swapping the buffer associated with the current context
1339 * we have to flush any pending rendering commands first.
1340 */
1341 if (ctx && ctx->DrawBuffer == &(b->mesa_buffer))
1342 XMesaNotifySwapBuffers(ctx);
1343
1344 if (b->db_mode) {
1345 if (b->backxrb->ximage) {
1346 /* Copy Ximage (back buf) from client memory to server window */
1347 #if defined(USE_XSHM)
1348 if (b->shm) {
1349 /*mtx_lock(&_xmesa_lock);*/
1350 XShmPutImage( b->xm_visual->display, b->frontxrb->drawable,
1351 b->swapgc,
1352 b->backxrb->ximage, 0, 0,
1353 0, 0, b->mesa_buffer.Width, b->mesa_buffer.Height,
1354 False );
1355 /*mtx_unlock(&_xmesa_lock);*/
1356 }
1357 else
1358 #endif
1359 {
1360 /*mtx_lock(&_xmesa_lock);*/
1361 XMesaPutImage( b->xm_visual->display, b->frontxrb->drawable,
1362 b->swapgc,
1363 b->backxrb->ximage, 0, 0,
1364 0, 0, b->mesa_buffer.Width, b->mesa_buffer.Height );
1365 /*mtx_unlock(&_xmesa_lock);*/
1366 }
1367 }
1368 else if (b->backxrb->pixmap) {
1369 /* Copy pixmap (back buf) to window (front buf) on server */
1370 /*mtx_lock(&_xmesa_lock);*/
1371 XMesaCopyArea( b->xm_visual->display,
1372 b->backxrb->pixmap, /* source drawable */
1373 b->frontxrb->drawable, /* dest. drawable */
1374 b->swapgc,
1375 0, 0, b->mesa_buffer.Width, b->mesa_buffer.Height,
1376 0, 0 /* dest region */
1377 );
1378 /*mtx_unlock(&_xmesa_lock);*/
1379 }
1380 }
1381 XSync( b->xm_visual->display, False );
1382 }
1383
1384
1385
1386 /*
1387 * Copy sub-region of back buffer to front buffer
1388 */
XMesaCopySubBuffer(XMesaBuffer b,int x,int y,int width,int height)1389 void XMesaCopySubBuffer( XMesaBuffer b, int x, int y, int width, int height )
1390 {
1391 GET_CURRENT_CONTEXT(ctx);
1392
1393 /* If we're swapping the buffer associated with the current context
1394 * we have to flush any pending rendering commands first.
1395 */
1396 if (ctx && ctx->DrawBuffer == &(b->mesa_buffer))
1397 XMesaNotifySwapBuffers(ctx);
1398
1399 if (!b->backxrb) {
1400 /* single buffered */
1401 return;
1402 }
1403
1404 if (b->db_mode) {
1405 int yTop = b->mesa_buffer.Height - y - height;
1406 if (b->backxrb->ximage) {
1407 /* Copy Ximage from host's memory to server's window */
1408 #if defined(USE_XSHM)
1409 if (b->shm) {
1410 /* XXX assuming width and height aren't too large! */
1411 XShmPutImage( b->xm_visual->display, b->frontxrb->drawable,
1412 b->swapgc,
1413 b->backxrb->ximage, x, yTop,
1414 x, yTop, width, height, False );
1415 /* wait for finished event??? */
1416 }
1417 else
1418 #endif
1419 {
1420 /* XXX assuming width and height aren't too large! */
1421 XMesaPutImage( b->xm_visual->display, b->frontxrb->drawable,
1422 b->swapgc,
1423 b->backxrb->ximage, x, yTop,
1424 x, yTop, width, height );
1425 }
1426 }
1427 else {
1428 /* Copy pixmap to window on server */
1429 XMesaCopyArea( b->xm_visual->display,
1430 b->backxrb->pixmap, /* source drawable */
1431 b->frontxrb->drawable, /* dest. drawable */
1432 b->swapgc,
1433 x, yTop, width, height, /* source region */
1434 x, yTop /* dest region */
1435 );
1436 }
1437 }
1438 }
1439
1440
1441 /*
1442 * Return a pointer to the XMesa backbuffer Pixmap or XImage. This function
1443 * is a way to get "under the hood" of X/Mesa so one can manipulate the
1444 * back buffer directly.
1445 * Output: pixmap - pointer to back buffer's Pixmap, or 0
1446 * ximage - pointer to back buffer's XImage, or NULL
1447 * Return: GL_TRUE = context is double buffered
1448 * GL_FALSE = context is single buffered
1449 */
XMesaGetBackBuffer(XMesaBuffer b,XMesaPixmap * pixmap,XMesaImage ** ximage)1450 GLboolean XMesaGetBackBuffer( XMesaBuffer b,
1451 XMesaPixmap *pixmap,
1452 XMesaImage **ximage )
1453 {
1454 if (b->db_mode) {
1455 if (pixmap)
1456 *pixmap = b->backxrb->pixmap;
1457 if (ximage)
1458 *ximage = b->backxrb->ximage;
1459 return GL_TRUE;
1460 }
1461 else {
1462 *pixmap = 0;
1463 *ximage = NULL;
1464 return GL_FALSE;
1465 }
1466 }
1467
1468
1469 /*
1470 * Return the depth buffer associated with an XMesaBuffer.
1471 * Input: b - the XMesa buffer handle
1472 * Output: width, height - size of buffer in pixels
1473 * bytesPerValue - bytes per depth value (2 or 4)
1474 * buffer - pointer to depth buffer values
1475 * Return: GL_TRUE or GL_FALSE to indicate success or failure.
1476 */
XMesaGetDepthBuffer(XMesaBuffer b,GLint * width,GLint * height,GLint * bytesPerValue,void ** buffer)1477 GLboolean XMesaGetDepthBuffer( XMesaBuffer b, GLint *width, GLint *height,
1478 GLint *bytesPerValue, void **buffer )
1479 {
1480 struct gl_renderbuffer *rb
1481 = b->mesa_buffer.Attachment[BUFFER_DEPTH].Renderbuffer;
1482 struct xmesa_renderbuffer *xrb = xmesa_renderbuffer(rb);
1483
1484 if (!xrb || !xrb->Base.Buffer) {
1485 *width = 0;
1486 *height = 0;
1487 *bytesPerValue = 0;
1488 *buffer = 0;
1489 return GL_FALSE;
1490 }
1491 else {
1492 *width = b->mesa_buffer.Width;
1493 *height = b->mesa_buffer.Height;
1494 *bytesPerValue = b->mesa_buffer.Visual.depthBits <= 16
1495 ? sizeof(GLushort) : sizeof(GLuint);
1496 *buffer = (void *) xrb->Base.Buffer;
1497 return GL_TRUE;
1498 }
1499 }
1500
1501
XMesaFlush(XMesaContext c)1502 void XMesaFlush( XMesaContext c )
1503 {
1504 if (c && c->xm_visual) {
1505 XSync( c->xm_visual->display, False );
1506 }
1507 }
1508
1509
1510
XMesaGetString(XMesaContext c,int name)1511 const char *XMesaGetString( XMesaContext c, int name )
1512 {
1513 (void) c;
1514 if (name==XMESA_VERSION) {
1515 return "5.0";
1516 }
1517 else if (name==XMESA_EXTENSIONS) {
1518 return "";
1519 }
1520 else {
1521 return NULL;
1522 }
1523 }
1524
1525
1526
XMesaFindBuffer(XMesaDisplay * dpy,XMesaDrawable d)1527 XMesaBuffer XMesaFindBuffer( XMesaDisplay *dpy, XMesaDrawable d )
1528 {
1529 XMesaBuffer b;
1530 for (b=XMesaBufferList; b; b=b->Next) {
1531 if (b->frontxrb->drawable == d && b->display == dpy) {
1532 return b;
1533 }
1534 }
1535 return NULL;
1536 }
1537
1538
1539 /**
1540 * Free/destroy all XMesaBuffers associated with given display.
1541 */
xmesa_destroy_buffers_on_display(XMesaDisplay * dpy)1542 void xmesa_destroy_buffers_on_display(XMesaDisplay *dpy)
1543 {
1544 XMesaBuffer b, next;
1545 for (b = XMesaBufferList; b; b = next) {
1546 next = b->Next;
1547 if (b->display == dpy) {
1548 xmesa_free_buffer(b);
1549 }
1550 }
1551 }
1552
1553
1554 /*
1555 * Look for XMesaBuffers whose X window has been destroyed.
1556 * Deallocate any such XMesaBuffers.
1557 */
XMesaGarbageCollect(XMesaDisplay * dpy)1558 void XMesaGarbageCollect( XMesaDisplay* dpy )
1559 {
1560 XMesaBuffer b, next;
1561 for (b=XMesaBufferList; b; b=next) {
1562 next = b->Next;
1563 if (b->display && b->display == dpy && b->frontxrb->drawable && b->type == WINDOW) {
1564 XSync(b->display, False);
1565 if (!window_exists( b->display, b->frontxrb->drawable )) {
1566 /* found a dead window, free the ancillary info */
1567 XMesaDestroyBuffer( b );
1568 }
1569 }
1570 }
1571 }
1572
1573
XMesaDitherColor(XMesaContext xmesa,GLint x,GLint y,GLfloat red,GLfloat green,GLfloat blue,GLfloat alpha)1574 unsigned long XMesaDitherColor( XMesaContext xmesa, GLint x, GLint y,
1575 GLfloat red, GLfloat green,
1576 GLfloat blue, GLfloat alpha )
1577 {
1578 GLint r = (GLint) (red * 255.0F);
1579 GLint g = (GLint) (green * 255.0F);
1580 GLint b = (GLint) (blue * 255.0F);
1581 GLint a = (GLint) (alpha * 255.0F);
1582
1583 switch (xmesa->pixelformat) {
1584 case PF_Truecolor:
1585 {
1586 unsigned long p;
1587 PACK_TRUECOLOR( p, r, g, b );
1588 return p;
1589 }
1590 case PF_8A8B8G8R:
1591 return PACK_8A8B8G8R( r, g, b, a );
1592 case PF_8A8R8G8B:
1593 return PACK_8A8R8G8B( r, g, b, a );
1594 case PF_8R8G8B:
1595 return PACK_8R8G8B( r, g, b );
1596 case PF_5R6G5B:
1597 return PACK_5R6G5B( r, g, b );
1598 case PF_Dither_5R6G5B:
1599 FALLTHROUGH;
1600 case PF_Dither_True:
1601 {
1602 unsigned long p;
1603 PACK_TRUEDITHER(p, x, y, r, g, b);
1604 return p;
1605 }
1606 default:
1607 _mesa_problem(NULL, "Bad pixel format in XMesaDitherColor");
1608 }
1609 return 0;
1610 }
1611
1612
1613 /*
1614 * This is typically called when the window size changes and we need
1615 * to reallocate the buffer's back/depth/stencil/accum buffers.
1616 */
1617 PUBLIC void
XMesaResizeBuffers(XMesaBuffer b)1618 XMesaResizeBuffers( XMesaBuffer b )
1619 {
1620 GET_CURRENT_CONTEXT(ctx);
1621 XMesaContext xmctx = XMESA_CONTEXT(ctx);
1622 if (!xmctx)
1623 return;
1624 xmesa_check_and_update_buffer_size(xmctx, b);
1625 }
1626
1627
1628 static GLint
xbuffer_to_renderbuffer(int buffer)1629 xbuffer_to_renderbuffer(int buffer)
1630 {
1631 assert(MAX_AUX_BUFFERS <= 4);
1632
1633 switch (buffer) {
1634 case GLX_FRONT_LEFT_EXT:
1635 return BUFFER_FRONT_LEFT;
1636 case GLX_FRONT_RIGHT_EXT:
1637 return BUFFER_FRONT_RIGHT;
1638 case GLX_BACK_LEFT_EXT:
1639 return BUFFER_BACK_LEFT;
1640 case GLX_BACK_RIGHT_EXT:
1641 return BUFFER_BACK_RIGHT;
1642 case GLX_AUX0_EXT:
1643 case GLX_AUX1_EXT:
1644 case GLX_AUX2_EXT:
1645 case GLX_AUX3_EXT:
1646 case GLX_AUX4_EXT:
1647 case GLX_AUX5_EXT:
1648 case GLX_AUX6_EXT:
1649 case GLX_AUX7_EXT:
1650 case GLX_AUX8_EXT:
1651 case GLX_AUX9_EXT:
1652 default:
1653 /* BadValue error */
1654 return -1;
1655 }
1656 }
1657
1658
1659 PUBLIC void
XMesaBindTexImage(XMesaDisplay * dpy,XMesaBuffer drawable,int buffer,const int * attrib_list)1660 XMesaBindTexImage(XMesaDisplay *dpy, XMesaBuffer drawable, int buffer,
1661 const int *attrib_list)
1662 {
1663 #if 0
1664 GET_CURRENT_CONTEXT(ctx);
1665 const GLuint unit = ctx->Texture.CurrentUnit;
1666 struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
1667 struct gl_texture_object *texObj;
1668 #endif
1669 struct gl_renderbuffer *rb;
1670 struct xmesa_renderbuffer *xrb;
1671 GLint b;
1672 XMesaImage *img = NULL;
1673 GLboolean freeImg = GL_FALSE;
1674
1675 b = xbuffer_to_renderbuffer(buffer);
1676 if (b < 0)
1677 return;
1678
1679 if (drawable->TextureFormat == GLX_TEXTURE_FORMAT_NONE_EXT)
1680 return; /* BadMatch error */
1681
1682 rb = drawable->mesa_buffer.Attachment[b].Renderbuffer;
1683 if (!rb) {
1684 /* invalid buffer */
1685 return;
1686 }
1687 xrb = xmesa_renderbuffer(rb);
1688
1689 #if 0
1690 switch (drawable->TextureTarget) {
1691 case GLX_TEXTURE_1D_EXT:
1692 texObj = texUnit->CurrentTex[TEXTURE_1D_INDEX];
1693 break;
1694 case GLX_TEXTURE_2D_EXT:
1695 texObj = texUnit->CurrentTex[TEXTURE_2D_INDEX];
1696 break;
1697 case GLX_TEXTURE_RECTANGLE_EXT:
1698 texObj = texUnit->CurrentTex[TEXTURE_RECT_INDEX];
1699 break;
1700 default:
1701 return; /* BadMatch error */
1702 }
1703 #endif
1704
1705 /*
1706 * The following is a quick and simple way to implement
1707 * BindTexImage. The better way is to write some new FetchTexel()
1708 * functions which would extract texels from XImages. We'd still
1709 * need to use GetImage when texturing from a Pixmap (front buffer)
1710 * but texturing from a back buffer (XImage) would avoid an image
1711 * copy.
1712 */
1713
1714 /* get XImage */
1715 if (xrb->pixmap) {
1716 img = XMesaGetImage(dpy, xrb->pixmap, 0, 0, rb->Width, rb->Height, ~0L,
1717 ZPixmap);
1718 freeImg = GL_TRUE;
1719 }
1720 else if (xrb->ximage) {
1721 img = xrb->ximage;
1722 }
1723
1724 /* store the XImage as a new texture image */
1725 if (img) {
1726 GLenum format, type, intFormat;
1727 if (img->bits_per_pixel == 32) {
1728 format = GL_BGRA;
1729 type = GL_UNSIGNED_BYTE;
1730 intFormat = GL_RGBA;
1731 }
1732 else if (img->bits_per_pixel == 24) {
1733 format = GL_BGR;
1734 type = GL_UNSIGNED_BYTE;
1735 intFormat = GL_RGB;
1736 }
1737 else if (img->bits_per_pixel == 16) {
1738 format = GL_BGR;
1739 type = GL_UNSIGNED_SHORT_5_6_5;
1740 intFormat = GL_RGB;
1741 }
1742 else {
1743 _mesa_problem(NULL, "Unexpected XImage format in XMesaBindTexImage");
1744 return;
1745 }
1746 if (drawable->TextureFormat == GLX_TEXTURE_FORMAT_RGBA_EXT) {
1747 intFormat = GL_RGBA;
1748 }
1749 else if (drawable->TextureFormat == GLX_TEXTURE_FORMAT_RGB_EXT) {
1750 intFormat = GL_RGB;
1751 }
1752
1753 _mesa_TexImage2D(GL_TEXTURE_2D, 0, intFormat, rb->Width, rb->Height, 0,
1754 format, type, img->data);
1755
1756 if (freeImg) {
1757 XMesaDestroyImage(img);
1758 }
1759 }
1760 }
1761
1762
1763
1764 PUBLIC void
XMesaReleaseTexImage(XMesaDisplay * dpy,XMesaBuffer drawable,int buffer)1765 XMesaReleaseTexImage(XMesaDisplay *dpy, XMesaBuffer drawable, int buffer)
1766 {
1767 const GLint b = xbuffer_to_renderbuffer(buffer);
1768 if (b < 0)
1769 return;
1770
1771 /* no-op for now */
1772 }
1773
1774