WebSVN – Kolibri OS – Blame – /contrib/sdk/sources/Mesa/src/mesa/drivers/x11/xm_api.c

Rev	Author	Line No.	Line
4358	Serge	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 "glxheader.h"
		66	#include "xmesaP.h"
		67	#include "main/api_exec.h"
		68	#include "main/context.h"
		69	#include "main/extensions.h"
		70	#include "main/framebuffer.h"
		71	#include "main/imports.h"
		72	#include "main/macros.h"
		73	#include "main/renderbuffer.h"
		74	#include "main/teximage.h"
		75	#include "main/version.h"
		76	#include "main/vtxfmt.h"
		77	#include "glapi/glthread.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
		88	/**
		89	* Global X driver lock
		90	*/
		91	_glthread_Mutex _xmesa_lock;
		92
		93
		94
		95	/**********************************************************************/
		96	/*** X Utility Functions ***/
		97	/**********************************************************************/
		98
		99
		100	/**
		101	* Return the host's byte order as LSBFirst or MSBFirst ala X.
		102	*/
		103	static int host_byte_order( void )
		104	{
		105	int i = 1;
		106	char cptr = (char ) &i;
		107	return (*cptr==1) ? LSBFirst : MSBFirst;
		108	}
		109
		110
		111	/**
		112	* Check if the X Shared Memory extension is available.
		113	* Return: 0 = not available
		114	* 1 = shared XImage support available
		115	* 2 = shared Pixmap support available also
		116	*/
		117	static int check_for_xshm( XMesaDisplay *display )
		118	{
		119	#if defined(USE_XSHM)
		120	int ignore;
		121
		122	if (XQueryExtension( display, "MIT-SHM", &ignore, &ignore, &ignore )) {
		123	/* Note: we're no longer calling XShmQueryVersion() here. It seems
		124	* to be flakey (triggers a spurious X protocol error when we close
		125	* one display connection and start using a new one. XShm has been
		126	* around a long time and hasn't changed so if MIT_SHM is supported
		127	* we assume we're good to go.
		128	*/
		129	return 2;
		130	}
		131	else {
		132	return 0;
		133	}
		134	#else
		135	/* No XSHM support */
		136	return 0;
		137	#endif
		138	}
		139
		140
		141	/**
		142	* Apply gamma correction to an intensity value in [0..max]. Return the
		143	* new intensity value.
		144	*/
		145	static GLint
		146	gamma_adjust( GLfloat gamma, GLint value, GLint max )
		147	{
		148	if (gamma == 1.0) {
		149	return value;
		150	}
		151	else {
		152	double x = (double) value / (double) max;
		153	return IROUND_POS((GLfloat) max * pow(x, 1.0F/gamma));
		154	}
		155	}
		156
		157
		158
		159	/**
		160	* Return the true number of bits per pixel for XImages.
		161	* For example, if we request a 24-bit deep visual we may actually need/get
		162	* 32bpp XImages. This function returns the appropriate bpp.
		163	* Input: dpy - the X display
		164	* visinfo - desribes the visual to be used for XImages
		165	* Return: true number of bits per pixel for XImages
		166	*/
		167	static int
		168	bits_per_pixel( XMesaVisual xmv )
		169	{
		170	XMesaDisplay *dpy = xmv->display;
		171	XMesaVisualInfo visinfo = xmv->visinfo;
		172	XMesaImage *img;
		173	int bitsPerPixel;
		174	/* Create a temporary XImage */
		175	img = XCreateImage( dpy, visinfo->visual, visinfo->depth,
		176	ZPixmap, 0, /format, offset/
		177	malloc(8), /data/
		178	1, 1, /width, height/
		179	32, /bitmap_pad/
		180
		181	);
		182	assert(img);
		183	/* grab the bits/pixel value */
		184	bitsPerPixel = img->bits_per_pixel;
		185	/* free the XImage */
		186	free( img->data );
		187	img->data = NULL;
		188	XMesaDestroyImage( img );
		189	return bitsPerPixel;
		190	}
		191
		192
		193
		194	/*
		195	* Determine if a given X window ID is valid (window exists).
		196	* Do this by calling XGetWindowAttributes() for the window and
		197	* checking if we catch an X error.
		198	* Input: dpy - the display
		199	* win - the window to check for existance
		200	* Return: GL_TRUE - window exists
		201	* GL_FALSE - window doesn't exist
		202	*/
		203	static GLboolean WindowExistsFlag;
		204
		205	static int window_exists_err_handler( XMesaDisplay* dpy, XErrorEvent* xerr )
		206	{
		207	(void) dpy;
		208	if (xerr->error_code == BadWindow) {
		209	WindowExistsFlag = GL_FALSE;
		210	}
		211	return 0;
		212	}
		213
		214	static GLboolean window_exists( XMesaDisplay *dpy, Window win )
		215	{
		216	XWindowAttributes wa;
		217	int (old_handler)( XMesaDisplay, XErrorEvent* );
		218	WindowExistsFlag = GL_TRUE;
		219	old_handler = XSetErrorHandler(window_exists_err_handler);
		220	XGetWindowAttributes( dpy, win, &wa ); /* dummy request */
		221	XSetErrorHandler(old_handler);
		222	return WindowExistsFlag;
		223	}
		224
		225	static Status
		226	get_drawable_size( XMesaDisplay dpy, Drawable d, GLuint width, GLuint *height )
		227	{
		228	Window root;
		229	Status stat;
		230	int xpos, ypos;
		231	unsigned int w, h, bw, depth;
		232	stat = XGetGeometry(dpy, d, &root, &xpos, &ypos, &w, &h, &bw, &depth);
		233	*width = w;
		234	*height = h;
		235	return stat;
		236	}
		237
		238
		239	/**
		240	* Return the size of the window (or pixmap) that corresponds to the
		241	* given XMesaBuffer.
		242	* \param width returns width in pixels
		243	* \param height returns height in pixels
		244	*/
		245	void
		246	xmesa_get_window_size(XMesaDisplay *dpy, XMesaBuffer b,
		247	GLuint width, GLuint height)
		248	{
		249	Status stat;
		250
		251	_glthread_LOCK_MUTEX(_xmesa_lock);
		252	XSync(b->xm_visual->display, 0); /* added for Chromium */
		253	stat = get_drawable_size(dpy, b->frontxrb->pixmap, width, height);
		254	_glthread_UNLOCK_MUTEX(_xmesa_lock);
		255
		256	if (!stat) {
		257	/* probably querying a window that's recently been destroyed */
		258	_mesa_warning(NULL, "XGetGeometry failed!\n");
		259	width = height = 1;
		260	}
		261	}
		262
		263
		264
		265	/**********************************************************************/
		266	/*** Linked list of XMesaBuffers ***/
		267	/**********************************************************************/
		268
		269	XMesaBuffer XMesaBufferList = NULL;
		270
		271
		272	/**
		273	* Allocate a new XMesaBuffer object which corresponds to the given drawable.
		274	* Note that XMesaBuffer is derived from struct gl_framebuffer.
		275	* The new XMesaBuffer will not have any size (Width=Height=0).
		276	*
		277	* \param d the corresponding X drawable (window or pixmap)
		278	* \param type either WINDOW, PIXMAP or PBUFFER, describing d
		279	* \param vis the buffer's visual
		280	* \param cmap the window's colormap, if known.
		281	* \return new XMesaBuffer or NULL if any problem
		282	*/
		283	static XMesaBuffer
		284	create_xmesa_buffer(XMesaDrawable d, BufferType type,
		285	XMesaVisual vis, XMesaColormap cmap)
		286	{
		287	XMesaBuffer b;
		288
		289	ASSERT(type == WINDOW \|\| type == PIXMAP \|\| type == PBUFFER);
		290
		291	b = (XMesaBuffer) CALLOC_STRUCT(xmesa_buffer);
		292	if (!b)
		293	return NULL;
		294
		295	b->display = vis->display;
		296	b->xm_visual = vis;
		297	b->type = type;
		298	b->cmap = cmap;
		299
		300	_mesa_initialize_window_framebuffer(&b->mesa_buffer, &vis->mesa_visual);
		301	b->mesa_buffer.Delete = xmesa_delete_framebuffer;
		302
		303	/*
		304	* Front renderbuffer
		305	*/
		306	b->frontxrb = xmesa_new_renderbuffer(NULL, 0, vis, GL_FALSE);
		307	if (!b->frontxrb) {
		308	free(b);
		309	return NULL;
		310	}
		311	b->frontxrb->Parent = b;
		312	b->frontxrb->drawable = d;
		313	b->frontxrb->pixmap = (XMesaPixmap) d;
		314	_mesa_add_renderbuffer(&b->mesa_buffer, BUFFER_FRONT_LEFT,
		315	&b->frontxrb->Base.Base);
		316
		317	/*
		318	* Back renderbuffer
		319	*/
		320	if (vis->mesa_visual.doubleBufferMode) {
		321	b->backxrb = xmesa_new_renderbuffer(NULL, 0, vis, GL_TRUE);
		322	if (!b->backxrb) {
		323	/* XXX free front xrb too */
		324	free(b);
		325	return NULL;
		326	}
		327	b->backxrb->Parent = b;
		328	/* determine back buffer implementation */
		329	b->db_mode = vis->ximage_flag ? BACK_XIMAGE : BACK_PIXMAP;
		330
		331	_mesa_add_renderbuffer(&b->mesa_buffer, BUFFER_BACK_LEFT,
		332	&b->backxrb->Base.Base);
		333	}
		334
		335	/*
		336	* Other renderbuffer (depth, stencil, etc)
		337	*/
		338	_swrast_add_soft_renderbuffers(&b->mesa_buffer,
		339	GL_FALSE, /* color */
		340	vis->mesa_visual.haveDepthBuffer,
		341	vis->mesa_visual.haveStencilBuffer,
		342	vis->mesa_visual.haveAccumBuffer,
		343	GL_FALSE, /* software alpha buffer */
		344	vis->mesa_visual.numAuxBuffers > 0 );
		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
		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
		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
		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	016, 816, 216, 1016,
		462	1216, 416, 1416, 616,
		463	316, 1116, 116, 916,
		464	1516, 716, 1316, 516,
		465	};
		466	GLint rBits = _mesa_bitcount(rmask);
		467	GLint gBits = _mesa_bitcount(gmask);
		468	GLint bBits = _mesa_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
		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	v->mesa_visual.indexBits = 0;
		585
		586	if (_mesa_getenv("MESA_NO_DITHER")) {
		587	v->dithered_pf = v->undithered_pf;
		588	}
		589
		590
		591	/*
		592	* If MESA_INFO env var is set print out some debugging info
		593	* which can help Brian figure out what's going on when a user
		594	* reports bugs.
		595	*/
		596	if (_mesa_getenv("MESA_INFO")) {
		597	printf("X/Mesa visual = %p\n", (void *) v);
		598	printf("X/Mesa dithered pf = %u\n", v->dithered_pf);
		599	printf("X/Mesa undithered pf = %u\n", v->undithered_pf);
		600	printf("X/Mesa level = %d\n", v->mesa_visual.level);
		601	printf("X/Mesa depth = %d\n", GET_VISUAL_DEPTH(v));
		602	printf("X/Mesa bits per pixel = %d\n", v->BitsPerPixel);
		603	}
		604
		605	if (b && window) {
		606	/* Do window-specific initializations */
		607
		608	/* these should have been set in create_xmesa_buffer */
		609	ASSERT(b->frontxrb->drawable == window);
		610	ASSERT(b->frontxrb->pixmap == (XMesaPixmap) window);
		611
		612	/* Setup for single/double buffering */
		613	if (v->mesa_visual.doubleBufferMode) {
		614	/* Double buffered */
		615	b->shm = check_for_xshm( v->display );
		616	}
		617
		618	/* X11 graphics contexts */
		619	b->gc = XCreateGC( v->display, window, 0, NULL );
		620	XMesaSetFunction( v->display, b->gc, GXcopy );
		621
		622	/* cleargc - for glClear() */
		623	b->cleargc = XCreateGC( v->display, window, 0, NULL );
		624	XMesaSetFunction( v->display, b->cleargc, GXcopy );
		625
		626	/*
		627	* Don't generate Graphics Expose/NoExpose events in swapbuffers().
		628	* Patch contributed by Michael Pichler May 15, 1995.
		629	*/
		630	{
		631	XGCValues gcvalues;
		632	gcvalues.graphics_exposures = False;
		633	b->swapgc = XCreateGC(v->display, window,
		634	GCGraphicsExposures, &gcvalues);
		635	}
		636	XMesaSetFunction( v->display, b->swapgc, GXcopy );
		637	}
		638
		639	return GL_TRUE;
		640	}
		641
		642
		643
		644	/*
		645	* Convert an RGBA color to a pixel value.
		646	*/
		647	unsigned long
		648	xmesa_color_to_pixel(struct gl_context *ctx,
		649	GLubyte r, GLubyte g, GLubyte b, GLubyte a,
		650	GLuint pixelFormat)
		651	{
		652	XMesaContext xmesa = XMESA_CONTEXT(ctx);
		653	switch (pixelFormat) {
		654	case PF_Truecolor:
		655	{
		656	unsigned long p;
		657	PACK_TRUECOLOR( p, r, g, b );
		658	return p;
		659	}
		660	case PF_8A8B8G8R:
		661	return PACK_8A8B8G8R( r, g, b, a );
		662	case PF_8A8R8G8B:
		663	return PACK_8A8R8G8B( r, g, b, a );
		664	case PF_8R8G8B:
		665	/* fall through */
		666	case PF_8R8G8B24:
		667	return PACK_8R8G8B( r, g, b );
		668	case PF_5R6G5B:
		669	return PACK_5R6G5B( r, g, b );
		670	case PF_Dither_True:
		671	/* fall through */
		672	case PF_Dither_5R6G5B:
		673	{
		674	unsigned long p;
		675	PACK_TRUEDITHER(p, 1, 0, r, g, b);
		676	return p;
		677	}
		678	default:
		679	_mesa_problem(ctx, "Bad pixel format in xmesa_color_to_pixel");
		680	}
		681	return 0;
		682	}
		683
		684
		685	#define NUM_VISUAL_TYPES 6
		686
		687	/**
		688	* Convert an X visual type to a GLX visual type.
		689	*
		690	* \param visualType X visual type (i.e., \c TrueColor, \c StaticGray, etc.)
		691	* to be converted.
		692	* \return If \c visualType is a valid X visual type, a GLX visual type will
		693	* be returned. Otherwise \c GLX_NONE will be returned.
		694	*
		695	* \note
		696	* This code was lifted directly from lib/GL/glx/glcontextmodes.c in the
		697	* DRI CVS tree.
		698	*/
		699	static GLint
		700	xmesa_convert_from_x_visual_type( int visualType )
		701	{
		702	static const int glx_visual_types[ NUM_VISUAL_TYPES ] = {
		703	GLX_STATIC_GRAY, GLX_GRAY_SCALE,
		704	GLX_STATIC_COLOR, GLX_PSEUDO_COLOR,
		705	GLX_TRUE_COLOR, GLX_DIRECT_COLOR
		706	};
		707
		708	return ( (unsigned) visualType < NUM_VISUAL_TYPES )
		709	? glx_visual_types[ visualType ] : GLX_NONE;
		710	}
		711
		712
		713	/**********************************************************************/
		714	/*** Public Functions ***/
		715	/**********************************************************************/
		716
		717
		718	/*
		719	* Create a new X/Mesa visual.
		720	* Input: display - X11 display
		721	* visinfo - an XVisualInfo pointer
		722	* rgb_flag - GL_TRUE = RGB mode,
		723	* GL_FALSE = color index mode
		724	* alpha_flag - alpha buffer requested?
		725	* db_flag - GL_TRUE = double-buffered,
		726	* GL_FALSE = single buffered
		727	* stereo_flag - stereo visual?
		728	* ximage_flag - GL_TRUE = use an XImage for back buffer,
		729	* GL_FALSE = use an off-screen pixmap for back buffer
		730	* depth_size - requested bits/depth values, or zero
		731	* stencil_size - requested bits/stencil values, or zero
		732	* accum_red_size - requested bits/red accum values, or zero
		733	* accum_green_size - requested bits/green accum values, or zero
		734	* accum_blue_size - requested bits/blue accum values, or zero
		735	* accum_alpha_size - requested bits/alpha accum values, or zero
		736	* num_samples - number of samples/pixel if multisampling, or zero
		737	* level - visual level, usually 0
		738	* visualCaveat - ala the GLX extension, usually GLX_NONE
		739	* Return; a new XMesaVisual or 0 if error.
		740	*/
		741	PUBLIC
		742	XMesaVisual XMesaCreateVisual( XMesaDisplay *display,
		743	XMesaVisualInfo visinfo,
		744	GLboolean rgb_flag,
		745	GLboolean alpha_flag,
		746	GLboolean db_flag,
		747	GLboolean stereo_flag,
		748	GLboolean ximage_flag,
		749	GLint depth_size,
		750	GLint stencil_size,
		751	GLint accum_red_size,
		752	GLint accum_green_size,
		753	GLint accum_blue_size,
		754	GLint accum_alpha_size,
		755	GLint num_samples,
		756	GLint level,
		757	GLint visualCaveat )
		758	{
		759	char *gamma;
		760	XMesaVisual v;
		761	GLint red_bits, green_bits, blue_bits, alpha_bits;
		762
		763	/* For debugging only */
		764	if (_mesa_getenv("MESA_XSYNC")) {
		765	/* This makes debugging X easier.
		766	* In your debugger, set a breakpoint on _XError to stop when an
		767	* X protocol error is generated.
		768	*/
		769	XSynchronize( display, 1 );
		770	}
		771
		772	/* Color-index rendering not supported. */
		773	if (!rgb_flag)
		774	return NULL;
		775
		776	v = (XMesaVisual) CALLOC_STRUCT(xmesa_visual);
		777	if (!v) {
		778	return NULL;
		779	}
		780
		781	v->display = display;
		782
		783	/* Save a copy of the XVisualInfo struct because the user may Xfree()
		784	* the struct but we may need some of the information contained in it
		785	* at a later time.
		786	*/
		787	v->visinfo = (XVisualInfo ) malloc(sizeof(visinfo));
		788	if(!v->visinfo) {
		789	free(v);
		790	return NULL;
		791	}
		792	memcpy(v->visinfo, visinfo, sizeof(*visinfo));
		793
		794	/* check for MESA_GAMMA environment variable */
		795	gamma = _mesa_getenv("MESA_GAMMA");
		796	if (gamma) {
		797	v->RedGamma = v->GreenGamma = v->BlueGamma = 0.0;
		798	sscanf( gamma, "%f %f %f", &v->RedGamma, &v->GreenGamma, &v->BlueGamma );
		799	if (v->RedGamma<=0.0) v->RedGamma = 1.0;
		800	if (v->GreenGamma<=0.0) v->GreenGamma = v->RedGamma;
		801	if (v->BlueGamma<=0.0) v->BlueGamma = v->RedGamma;
		802	}
		803	else {
		804	v->RedGamma = v->GreenGamma = v->BlueGamma = 1.0;
		805	}
		806
		807	v->ximage_flag = ximage_flag;
		808
		809	v->mesa_visual.redMask = visinfo->red_mask;
		810	v->mesa_visual.greenMask = visinfo->green_mask;
		811	v->mesa_visual.blueMask = visinfo->blue_mask;
		812	v->visualID = visinfo->visualid;
		813	v->screen = visinfo->screen;
		814
		815	#if !(defined(__cplusplus) \|\| defined(c_plusplus))
		816	v->visualType = xmesa_convert_from_x_visual_type(visinfo->class);
		817	#else
		818	v->visualType = xmesa_convert_from_x_visual_type(visinfo->c_class);
		819	#endif
		820
		821	v->mesa_visual.visualRating = visualCaveat;
		822
		823	if (alpha_flag)
		824	v->mesa_visual.alphaBits = 8;
		825
		826	(void) initialize_visual_and_buffer( v, NULL, 0, 0 );
		827
		828	{
		829	const int xclass = v->visualType;
		830	if (xclass == GLX_TRUE_COLOR \|\| xclass == GLX_DIRECT_COLOR) {
		831	red_bits = _mesa_bitcount(GET_REDMASK(v));
		832	green_bits = _mesa_bitcount(GET_GREENMASK(v));
		833	blue_bits = _mesa_bitcount(GET_BLUEMASK(v));
		834	}
		835	else {
		836	/* this is an approximation */
		837	int depth;
		838	depth = GET_VISUAL_DEPTH(v);
		839	red_bits = depth / 3;
		840	depth -= red_bits;
		841	green_bits = depth / 2;
		842	depth -= green_bits;
		843	blue_bits = depth;
		844	alpha_bits = 0;
		845	assert( red_bits + green_bits + blue_bits == GET_VISUAL_DEPTH(v) );
		846	}
		847	alpha_bits = v->mesa_visual.alphaBits;
		848	}
		849
		850	if (!_mesa_initialize_visual(&v->mesa_visual,
		851	db_flag, stereo_flag,
		852	red_bits, green_bits,
		853	blue_bits, alpha_bits,
		854	depth_size,
		855	stencil_size,
		856	accum_red_size, accum_green_size,
		857	accum_blue_size, accum_alpha_size,
		858	0)) {
		859	FREE(v);
		860	return NULL;
		861	}
		862
		863	/* XXX minor hack */
		864	v->mesa_visual.level = level;
		865	return v;
		866	}
		867
		868
		869	PUBLIC
		870	void XMesaDestroyVisual( XMesaVisual v )
		871	{
		872	free(v->visinfo);
		873	free(v);
		874	}
		875
		876
		877
		878	/**
		879	* Create a new XMesaContext.
		880	* \param v the XMesaVisual
		881	* \param share_list another XMesaContext with which to share display
		882	* lists or NULL if no sharing is wanted.
		883	* \return an XMesaContext or NULL if error.
		884	*/
		885	PUBLIC
		886	XMesaContext XMesaCreateContext( XMesaVisual v, XMesaContext share_list )
		887	{
		888	static GLboolean firstTime = GL_TRUE;
		889	XMesaContext c;
		890	struct gl_context *mesaCtx;
		891	struct dd_function_table functions;
		892	TNLcontext *tnl;
		893
		894	if (firstTime) {
		895	_glthread_INIT_MUTEX(_xmesa_lock);
		896	firstTime = GL_FALSE;
		897	}
		898
		899	/* Note: the XMesaContext contains a Mesa struct gl_context struct (inheritance) */
		900	c = (XMesaContext) CALLOC_STRUCT(xmesa_context);
		901	if (!c)
		902	return NULL;
		903
		904	mesaCtx = &(c->mesa);
		905
		906	/* initialize with default driver functions, then plug in XMesa funcs */
		907	_mesa_init_driver_functions(&functions);
		908	xmesa_init_driver_functions(v, &functions);
		909	if (!_mesa_initialize_context(mesaCtx, API_OPENGL_COMPAT, &v->mesa_visual,
		910	share_list ? &(share_list->mesa) : (struct gl_context *) NULL,
		911	&functions)) {
		912	free(c);
		913	return NULL;
		914	}
		915
		916	/* Enable this to exercise fixed function -> shader translation
		917	* with software rendering.
		918	*/
		919	if (0) {
		920	mesaCtx->VertexProgram._MaintainTnlProgram = GL_TRUE;
		921	mesaCtx->FragmentProgram._MaintainTexEnvProgram = GL_TRUE;
		922	}
		923
		924	_mesa_enable_sw_extensions(mesaCtx);
		925
		926	#if ENABLE_EXT_timer_query
		927	mesaCtx->Extensions.EXT_timer_query = GL_TRUE;
		928	#endif
		929
		930
		931	/* finish up xmesa context initializations */
		932	c->swapbytes = CHECK_BYTE_ORDER(v) ? GL_FALSE : GL_TRUE;
		933	c->xm_visual = v;
		934	c->xm_buffer = NULL; /* set later by XMesaMakeCurrent */
		935	c->display = v->display;
		936	c->pixelformat = v->dithered_pf; /* Dithering is enabled by default */
		937
		938	/* Initialize the software rasterizer and helper modules.
		939	*/
		940	if (!_swrast_CreateContext( mesaCtx ) \|\|
		941	!_vbo_CreateContext( mesaCtx ) \|\|
		942	!_tnl_CreateContext( mesaCtx ) \|\|
		943	!_swsetup_CreateContext( mesaCtx )) {
		944	_mesa_free_context_data(&c->mesa);
		945	free(c);
		946	return NULL;
		947	}
		948
		949	/* tnl setup */
		950	tnl = TNL_CONTEXT(mesaCtx);
		951	tnl->Driver.RunPipeline = _tnl_run_pipeline;
		952	/* swrast setup */
		953	xmesa_register_swrast_functions( mesaCtx );
		954	_swsetup_Wakeup(mesaCtx);
		955
		956	_mesa_meta_init(mesaCtx);
		957
		958	_mesa_compute_version(mesaCtx);
		959
		960	/* Exec table initialization requires the version to be computed */
		961	_mesa_initialize_dispatch_tables(mesaCtx);
		962	_mesa_initialize_vbo_vtxfmt(mesaCtx);
		963
		964	return c;
		965	}
		966
		967
		968
		969	PUBLIC
		970	void XMesaDestroyContext( XMesaContext c )
		971	{
		972	struct gl_context *mesaCtx = &c->mesa;
		973
		974	_mesa_meta_free( mesaCtx );
		975
		976	_swsetup_DestroyContext( mesaCtx );
		977	_swrast_DestroyContext( mesaCtx );
		978	_tnl_DestroyContext( mesaCtx );
		979	_vbo_DestroyContext( mesaCtx );
		980	_mesa_free_context_data( mesaCtx );
		981	free( c );
		982	}
		983
		984
		985
		986	/**
		987	* Private function for creating an XMesaBuffer which corresponds to an
		988	* X window or pixmap.
		989	* \param v the window's XMesaVisual
		990	* \param w the window we're wrapping
		991	* \return new XMesaBuffer or NULL if error
		992	*/
		993	PUBLIC XMesaBuffer
		994	XMesaCreateWindowBuffer(XMesaVisual v, XMesaWindow w)
		995	{
		996	XWindowAttributes attr;
		997	XMesaBuffer b;
		998	XMesaColormap cmap;
		999	int depth;
		1000
		1001	assert(v);
		1002	assert(w);
		1003
		1004	/* Check that window depth matches visual depth */
		1005	XGetWindowAttributes( v->display, w, &attr );
		1006	depth = attr.depth;
		1007	if (GET_VISUAL_DEPTH(v) != depth) {
		1008	_mesa_warning(NULL, "XMesaCreateWindowBuffer: depth mismatch between visual (%d) and window (%d)!\n",
		1009	GET_VISUAL_DEPTH(v), depth);
		1010	return NULL;
		1011	}
		1012
		1013	/* Find colormap */
		1014	if (attr.colormap) {
		1015	cmap = attr.colormap;
		1016	}
		1017	else {
		1018	_mesa_warning(NULL, "Window %u has no colormap!\n", (unsigned int) w);
		1019	/* this is weird, a window w/out a colormap!? */
		1020	/* OK, let's just allocate a new one and hope for the best */
		1021	cmap = XCreateColormap(v->display, w, attr.visual, AllocNone);
		1022	}
		1023
		1024	b = create_xmesa_buffer((XMesaDrawable) w, WINDOW, v, cmap);
		1025	if (!b)
		1026	return NULL;
		1027
		1028	if (!initialize_visual_and_buffer( v, b, (XMesaDrawable) w, cmap )) {
		1029	xmesa_free_buffer(b);
		1030	return NULL;
		1031	}
		1032
		1033	return b;
		1034	}
		1035
		1036
		1037
		1038	/**
		1039	* Create a new XMesaBuffer from an X pixmap.
		1040	*
		1041	* \param v the XMesaVisual
		1042	* \param p the pixmap
		1043	* \param cmap the colormap, may be 0 if using a \c GLX_TRUE_COLOR or
		1044	* \c GLX_DIRECT_COLOR visual for the pixmap
		1045	* \returns new XMesaBuffer or NULL if error
		1046	*/
		1047	PUBLIC XMesaBuffer
		1048	XMesaCreatePixmapBuffer(XMesaVisual v, XMesaPixmap p, XMesaColormap cmap)
		1049	{
		1050	XMesaBuffer b;
		1051
		1052	assert(v);
		1053
		1054	b = create_xmesa_buffer((XMesaDrawable) p, PIXMAP, v, cmap);
		1055	if (!b)
		1056	return NULL;
		1057
		1058	if (!initialize_visual_and_buffer(v, b, (XMesaDrawable) p, cmap)) {
		1059	xmesa_free_buffer(b);
		1060	return NULL;
		1061	}
		1062
		1063	return b;
		1064	}
		1065
		1066
		1067	/**
		1068	* For GLX_EXT_texture_from_pixmap
		1069	*/
		1070	XMesaBuffer
		1071	XMesaCreatePixmapTextureBuffer(XMesaVisual v, XMesaPixmap p,
		1072	XMesaColormap cmap,
		1073	int format, int target, int mipmap)
		1074	{
		1075	GET_CURRENT_CONTEXT(ctx);
		1076	XMesaBuffer b;
		1077	GLuint width, height;
		1078
		1079	assert(v);
		1080
		1081	b = create_xmesa_buffer((XMesaDrawable) p, PIXMAP, v, cmap);
		1082	if (!b)
		1083	return NULL;
		1084
		1085	/* get pixmap size, update framebuffer/renderbuffer dims */
		1086	xmesa_get_window_size(v->display, b, &width, &height);
		1087	_mesa_resize_framebuffer(NULL, &(b->mesa_buffer), width, height);
		1088
		1089	if (target == 0) {
		1090	/* examine dims */
		1091	if (ctx->Extensions.ARB_texture_non_power_of_two) {
		1092	target = GLX_TEXTURE_2D_EXT;
		1093	}
		1094	else if ( _mesa_bitcount(width) == 1
		1095	&& _mesa_bitcount(height) == 1) {
		1096	/* power of two size */
		1097	if (height == 1) {
		1098	target = GLX_TEXTURE_1D_EXT;
		1099	}
		1100	else {
		1101	target = GLX_TEXTURE_2D_EXT;
		1102	}
		1103	}
		1104	else if (ctx->Extensions.NV_texture_rectangle) {
		1105	target = GLX_TEXTURE_RECTANGLE_EXT;
		1106	}
		1107	else {
		1108	/* non power of two textures not supported */
		1109	XMesaDestroyBuffer(b);
		1110	return 0;
		1111	}
		1112	}
		1113
		1114	b->TextureTarget = target;
		1115	b->TextureFormat = format;
		1116	b->TextureMipmap = mipmap;
		1117
		1118	if (!initialize_visual_and_buffer(v, b, (XMesaDrawable) p, cmap)) {
		1119	xmesa_free_buffer(b);
		1120	return NULL;
		1121	}
		1122
		1123	return b;
		1124	}
		1125
		1126
		1127
		1128	XMesaBuffer
		1129	XMesaCreatePBuffer(XMesaVisual v, XMesaColormap cmap,
		1130	unsigned int width, unsigned int height)
		1131	{
		1132	XMesaWindow root;
		1133	XMesaDrawable drawable; /* X Pixmap Drawable */
		1134	XMesaBuffer b;
		1135
		1136	/* allocate pixmap for front buffer */
		1137	root = RootWindow( v->display, v->visinfo->screen );
		1138	drawable = XCreatePixmap(v->display, root, width, height,
		1139	v->visinfo->depth);
		1140	if (!drawable)
		1141	return NULL;
		1142
		1143	b = create_xmesa_buffer(drawable, PBUFFER, v, cmap);
		1144	if (!b)
		1145	return NULL;
		1146
		1147	if (!initialize_visual_and_buffer(v, b, drawable, cmap)) {
		1148	xmesa_free_buffer(b);
		1149	return NULL;
		1150	}
		1151
		1152	return b;
		1153	}
		1154
		1155
		1156
		1157	/*
		1158	* Deallocate an XMesaBuffer structure and all related info.
		1159	*/
		1160	PUBLIC void
		1161	XMesaDestroyBuffer(XMesaBuffer b)
		1162	{
		1163	xmesa_free_buffer(b);
		1164	}
		1165
		1166
		1167	/**
		1168	* Query the current window size and update the corresponding struct gl_framebuffer
		1169	* and all attached renderbuffers.
		1170	* Called when:
		1171	* 1. the first time a buffer is bound to a context.
		1172	* 2. from glViewport to poll for window size changes
		1173	* 3. from the XMesaResizeBuffers() API function.
		1174	* Note: it's possible (and legal) for xmctx to be NULL. That can happen
		1175	* when resizing a buffer when no rendering context is bound.
		1176	*/
		1177	void
		1178	xmesa_check_and_update_buffer_size(XMesaContext xmctx, XMesaBuffer drawBuffer)
		1179	{
		1180	GLuint width, height;
		1181	xmesa_get_window_size(drawBuffer->display, drawBuffer, &width, &height);
		1182	if (drawBuffer->mesa_buffer.Width != width \|\|
		1183	drawBuffer->mesa_buffer.Height != height) {
		1184	struct gl_context *ctx = xmctx ? &xmctx->mesa : NULL;
		1185	_mesa_resize_framebuffer(ctx, &(drawBuffer->mesa_buffer), width, height);
		1186	}
		1187	}
		1188
		1189
		1190	/*
		1191	* Bind buffer b to context c and make c the current rendering context.
		1192	*/
		1193	GLboolean XMesaMakeCurrent( XMesaContext c, XMesaBuffer b )
		1194	{
		1195	return XMesaMakeCurrent2( c, b, b );
		1196	}
		1197
		1198
		1199	/*
		1200	* Bind buffer b to context c and make c the current rendering context.
		1201	*/
		1202	PUBLIC
		1203	GLboolean XMesaMakeCurrent2( XMesaContext c, XMesaBuffer drawBuffer,
		1204	XMesaBuffer readBuffer )
		1205	{
		1206	if (c) {
		1207	if (!drawBuffer \|\| !readBuffer)
		1208	return GL_FALSE; /* must specify buffers! */
		1209
		1210	if (&(c->mesa) == _mesa_get_current_context()
		1211	&& c->mesa.DrawBuffer == &drawBuffer->mesa_buffer
		1212	&& c->mesa.ReadBuffer == &readBuffer->mesa_buffer
		1213	&& XMESA_BUFFER(c->mesa.DrawBuffer)->wasCurrent) {
		1214	/* same context and buffer, do nothing */
		1215	return GL_TRUE;
		1216	}
		1217
		1218	c->xm_buffer = drawBuffer;
		1219
		1220	/* Call this periodically to detect when the user has begun using
		1221	* GL rendering from multiple threads.
		1222	*/
		1223	_glapi_check_multithread();
		1224
		1225	xmesa_check_and_update_buffer_size(c, drawBuffer);
		1226	if (readBuffer != drawBuffer)
		1227	xmesa_check_and_update_buffer_size(c, readBuffer);
		1228
		1229	_mesa_make_current(&(c->mesa),
		1230	&drawBuffer->mesa_buffer,
		1231	&readBuffer->mesa_buffer);
		1232
		1233	/*
		1234	* Must recompute and set these pixel values because colormap
		1235	* can be different for different windows.
		1236	*/
		1237	c->clearpixel = xmesa_color_to_pixel( &c->mesa,
		1238	c->clearcolor[0],
		1239	c->clearcolor[1],
		1240	c->clearcolor[2],
		1241	c->clearcolor[3],
		1242	c->xm_visual->undithered_pf);
		1243	XMesaSetForeground(c->display, drawBuffer->cleargc, c->clearpixel);
		1244
		1245	/* Solution to Stephane Rehel's problem with glXReleaseBuffersMESA(): */
		1246	drawBuffer->wasCurrent = GL_TRUE;
		1247	}
		1248	else {
		1249	/* Detach */
		1250	_mesa_make_current( NULL, NULL, NULL );
		1251	}
		1252	return GL_TRUE;
		1253	}
		1254
		1255
		1256	/*
		1257	* Unbind the context c from its buffer.
		1258	*/
		1259	GLboolean XMesaUnbindContext( XMesaContext c )
		1260	{
		1261	/* A no-op for XFree86 integration purposes */
		1262	return GL_TRUE;
		1263	}
		1264
		1265
		1266	XMesaContext XMesaGetCurrentContext( void )
		1267	{
		1268	GET_CURRENT_CONTEXT(ctx);
		1269	if (ctx) {
		1270	XMesaContext xmesa = XMESA_CONTEXT(ctx);
		1271	return xmesa;
		1272	}
		1273	else {
		1274	return 0;
		1275	}
		1276	}
		1277
		1278
		1279	XMesaBuffer XMesaGetCurrentBuffer( void )
		1280	{
		1281	GET_CURRENT_CONTEXT(ctx);
		1282	if (ctx) {
		1283	XMesaBuffer xmbuf = XMESA_BUFFER(ctx->DrawBuffer);
		1284	return xmbuf;
		1285	}
		1286	else {
		1287	return 0;
		1288	}
		1289	}
		1290
		1291
		1292	/* New in Mesa 3.1 */
		1293	XMesaBuffer XMesaGetCurrentReadBuffer( void )
		1294	{
		1295	GET_CURRENT_CONTEXT(ctx);
		1296	if (ctx) {
		1297	return XMESA_BUFFER(ctx->ReadBuffer);
		1298	}
		1299	else {
		1300	return 0;
		1301	}
		1302	}
		1303
		1304
		1305
		1306	GLboolean XMesaSetFXmode( GLint mode )
		1307	{
		1308	(void) mode;
		1309	return GL_FALSE;
		1310	}
		1311
		1312
		1313
		1314	/*
		1315	* Copy the back buffer to the front buffer. If there's no back buffer
		1316	* this is a no-op.
		1317	*/
		1318	PUBLIC
		1319	void XMesaSwapBuffers( XMesaBuffer b )
		1320	{
		1321	GET_CURRENT_CONTEXT(ctx);
		1322
		1323	if (!b->backxrb) {
		1324	/* single buffered */
		1325	return;
		1326	}
		1327
		1328	/* If we're swapping the buffer associated with the current context
		1329	* we have to flush any pending rendering commands first.
		1330	*/
		1331	if (ctx && ctx->DrawBuffer == &(b->mesa_buffer))
		1332	_mesa_notifySwapBuffers(ctx);
		1333
		1334	if (b->db_mode) {
		1335	if (b->backxrb->ximage) {
		1336	/* Copy Ximage (back buf) from client memory to server window */
		1337	#if defined(USE_XSHM)
		1338	if (b->shm) {
		1339	/_glthread_LOCK_MUTEX(_xmesa_lock);/
		1340	XShmPutImage( b->xm_visual->display, b->frontxrb->drawable,
		1341	b->swapgc,
		1342	b->backxrb->ximage, 0, 0,
		1343	0, 0, b->mesa_buffer.Width, b->mesa_buffer.Height,
		1344	False );
		1345	/_glthread_UNLOCK_MUTEX(_xmesa_lock);/
		1346	}
		1347	else
		1348	#endif
		1349	{
		1350	/_glthread_LOCK_MUTEX(_xmesa_lock);/
		1351	XMesaPutImage( b->xm_visual->display, b->frontxrb->drawable,
		1352	b->swapgc,
		1353	b->backxrb->ximage, 0, 0,
		1354	0, 0, b->mesa_buffer.Width, b->mesa_buffer.Height );
		1355	/_glthread_UNLOCK_MUTEX(_xmesa_lock);/
		1356	}
		1357	}
		1358	else if (b->backxrb->pixmap) {
		1359	/* Copy pixmap (back buf) to window (front buf) on server */
		1360	/_glthread_LOCK_MUTEX(_xmesa_lock);/
		1361	XMesaCopyArea( b->xm_visual->display,
		1362	b->backxrb->pixmap, /* source drawable */
		1363	b->frontxrb->drawable, /* dest. drawable */
		1364	b->swapgc,
		1365	0, 0, b->mesa_buffer.Width, b->mesa_buffer.Height,
		1366	0, 0 /* dest region */
		1367	);
		1368	/_glthread_UNLOCK_MUTEX(_xmesa_lock);/
		1369	}
		1370	}
		1371	XSync( b->xm_visual->display, False );
		1372	}
		1373
		1374
		1375
		1376	/*
		1377	* Copy sub-region of back buffer to front buffer
		1378	*/
		1379	void XMesaCopySubBuffer( XMesaBuffer b, int x, int y, int width, int height )
		1380	{
		1381	GET_CURRENT_CONTEXT(ctx);
		1382
		1383	/* If we're swapping the buffer associated with the current context
		1384	* we have to flush any pending rendering commands first.
		1385	*/
		1386	if (ctx && ctx->DrawBuffer == &(b->mesa_buffer))
		1387	_mesa_notifySwapBuffers(ctx);
		1388
		1389	if (!b->backxrb) {
		1390	/* single buffered */
		1391	return;
		1392	}
		1393
		1394	if (b->db_mode) {
		1395	int yTop = b->mesa_buffer.Height - y - height;
		1396	if (b->backxrb->ximage) {
		1397	/* Copy Ximage from host's memory to server's window */
		1398	#if defined(USE_XSHM)
		1399	if (b->shm) {
		1400	/* XXX assuming width and height aren't too large! */
		1401	XShmPutImage( b->xm_visual->display, b->frontxrb->drawable,
		1402	b->swapgc,
		1403	b->backxrb->ximage, x, yTop,
		1404	x, yTop, width, height, False );
		1405	/* wait for finished event??? */
		1406	}
		1407	else
		1408	#endif
		1409	{
		1410	/* XXX assuming width and height aren't too large! */
		1411	XMesaPutImage( b->xm_visual->display, b->frontxrb->drawable,
		1412	b->swapgc,
		1413	b->backxrb->ximage, x, yTop,
		1414	x, yTop, width, height );
		1415	}
		1416	}
		1417	else {
		1418	/* Copy pixmap to window on server */
		1419	XMesaCopyArea( b->xm_visual->display,
		1420	b->backxrb->pixmap, /* source drawable */
		1421	b->frontxrb->drawable, /* dest. drawable */
		1422	b->swapgc,
		1423	x, yTop, width, height, /* source region */
		1424	x, yTop /* dest region */
		1425	);
		1426	}
		1427	}
		1428	}
		1429
		1430
		1431	/*
		1432	* Return a pointer to the XMesa backbuffer Pixmap or XImage. This function
		1433	* is a way to get "under the hood" of X/Mesa so one can manipulate the
		1434	* back buffer directly.
		1435	* Output: pixmap - pointer to back buffer's Pixmap, or 0
		1436	* ximage - pointer to back buffer's XImage, or NULL
		1437	* Return: GL_TRUE = context is double buffered
		1438	* GL_FALSE = context is single buffered
		1439	*/
		1440	GLboolean XMesaGetBackBuffer( XMesaBuffer b,
		1441	XMesaPixmap *pixmap,
		1442	XMesaImage **ximage )
		1443	{
		1444	if (b->db_mode) {
		1445	if (pixmap)
		1446	*pixmap = b->backxrb->pixmap;
		1447	if (ximage)
		1448	*ximage = b->backxrb->ximage;
		1449	return GL_TRUE;
		1450	}
		1451	else {
		1452	*pixmap = 0;
		1453	*ximage = NULL;
		1454	return GL_FALSE;
		1455	}
		1456	}
		1457
		1458
		1459	/*
		1460	* Return the depth buffer associated with an XMesaBuffer.
		1461	* Input: b - the XMesa buffer handle
		1462	* Output: width, height - size of buffer in pixels
		1463	* bytesPerValue - bytes per depth value (2 or 4)
		1464	* buffer - pointer to depth buffer values
		1465	* Return: GL_TRUE or GL_FALSE to indicate success or failure.
		1466	*/
		1467	GLboolean XMesaGetDepthBuffer( XMesaBuffer b, GLint width, GLint height,
		1468	GLint bytesPerValue, void *buffer )
		1469	{
		1470	struct gl_renderbuffer *rb
		1471	= b->mesa_buffer.Attachment[BUFFER_DEPTH].Renderbuffer;
		1472	struct xmesa_renderbuffer *xrb = xmesa_renderbuffer(rb);
		1473
		1474	if (!xrb \|\| !xrb->Base.Buffer) {
		1475	*width = 0;
		1476	*height = 0;
		1477	*bytesPerValue = 0;
		1478	*buffer = 0;
		1479	return GL_FALSE;
		1480	}
		1481	else {
		1482	*width = b->mesa_buffer.Width;
		1483	*height = b->mesa_buffer.Height;
		1484	*bytesPerValue = b->mesa_buffer.Visual.depthBits <= 16
		1485	? sizeof(GLushort) : sizeof(GLuint);
		1486	buffer = (void ) xrb->Base.Buffer;
		1487	return GL_TRUE;
		1488	}
		1489	}
		1490
		1491
		1492	void XMesaFlush( XMesaContext c )
		1493	{
		1494	if (c && c->xm_visual) {
		1495	XSync( c->xm_visual->display, False );
		1496	}
		1497	}
		1498
		1499
		1500
		1501	const char *XMesaGetString( XMesaContext c, int name )
		1502	{
		1503	(void) c;
		1504	if (name==XMESA_VERSION) {
		1505	return "5.0";
		1506	}
		1507	else if (name==XMESA_EXTENSIONS) {
		1508	return "";
		1509	}
		1510	else {
		1511	return NULL;
		1512	}
		1513	}
		1514
		1515
		1516
		1517	XMesaBuffer XMesaFindBuffer( XMesaDisplay *dpy, XMesaDrawable d )
		1518	{
		1519	XMesaBuffer b;
		1520	for (b=XMesaBufferList; b; b=b->Next) {
		1521	if (b->frontxrb->drawable == d && b->display == dpy) {
		1522	return b;
		1523	}
		1524	}
		1525	return NULL;
		1526	}
		1527
		1528
		1529	/**
		1530	* Free/destroy all XMesaBuffers associated with given display.
		1531	*/
		1532	void xmesa_destroy_buffers_on_display(XMesaDisplay *dpy)
		1533	{
		1534	XMesaBuffer b, next;
		1535	for (b = XMesaBufferList; b; b = next) {
		1536	next = b->Next;
		1537	if (b->display == dpy) {
		1538	xmesa_free_buffer(b);
		1539	}
		1540	}
		1541	}
		1542
		1543
		1544	/*
		1545	* Look for XMesaBuffers whose X window has been destroyed.
		1546	* Deallocate any such XMesaBuffers.
		1547	*/
		1548	void XMesaGarbageCollect( XMesaDisplay* dpy )
		1549	{
		1550	XMesaBuffer b, next;
		1551	for (b=XMesaBufferList; b; b=next) {
		1552	next = b->Next;
		1553	if (b->display && b->display == dpy && b->frontxrb->drawable && b->type == WINDOW) {
		1554	XSync(b->display, False);
		1555	if (!window_exists( b->display, b->frontxrb->drawable )) {
		1556	/* found a dead window, free the ancillary info */
		1557	XMesaDestroyBuffer( b );
		1558	}
		1559	}
		1560	}
		1561	}
		1562
		1563
		1564	unsigned long XMesaDitherColor( XMesaContext xmesa, GLint x, GLint y,
		1565	GLfloat red, GLfloat green,
		1566	GLfloat blue, GLfloat alpha )
		1567	{
		1568	GLint r = (GLint) (red * 255.0F);
		1569	GLint g = (GLint) (green * 255.0F);
		1570	GLint b = (GLint) (blue * 255.0F);
		1571	GLint a = (GLint) (alpha * 255.0F);
		1572
		1573	switch (xmesa->pixelformat) {
		1574	case PF_Truecolor:
		1575	{
		1576	unsigned long p;
		1577	PACK_TRUECOLOR( p, r, g, b );
		1578	return p;
		1579	}
		1580	case PF_8A8B8G8R:
		1581	return PACK_8A8B8G8R( r, g, b, a );
		1582	case PF_8A8R8G8B:
		1583	return PACK_8A8R8G8B( r, g, b, a );
		1584	case PF_8R8G8B:
		1585	return PACK_8R8G8B( r, g, b );
		1586	case PF_5R6G5B:
		1587	return PACK_5R6G5B( r, g, b );
		1588	case PF_Dither_5R6G5B:
		1589	/* fall through */
		1590	case PF_Dither_True:
		1591	{
		1592	unsigned long p;
		1593	PACK_TRUEDITHER(p, x, y, r, g, b);
		1594	return p;
		1595	}
		1596	default:
		1597	_mesa_problem(NULL, "Bad pixel format in XMesaDitherColor");
		1598	}
		1599	return 0;
		1600	}
		1601
		1602
		1603	/*
		1604	* This is typically called when the window size changes and we need
		1605	* to reallocate the buffer's back/depth/stencil/accum buffers.
		1606	*/
		1607	PUBLIC void
		1608	XMesaResizeBuffers( XMesaBuffer b )
		1609	{
		1610	GET_CURRENT_CONTEXT(ctx);
		1611	XMesaContext xmctx = XMESA_CONTEXT(ctx);
		1612	if (!xmctx)
		1613	return;
		1614	xmesa_check_and_update_buffer_size(xmctx, b);
		1615	}
		1616
		1617
		1618	static GLint
		1619	xbuffer_to_renderbuffer(int buffer)
		1620	{
		1621	assert(MAX_AUX_BUFFERS <= 4);
		1622
		1623	switch (buffer) {
		1624	case GLX_FRONT_LEFT_EXT:
		1625	return BUFFER_FRONT_LEFT;
		1626	case GLX_FRONT_RIGHT_EXT:
		1627	return BUFFER_FRONT_RIGHT;
		1628	case GLX_BACK_LEFT_EXT:
		1629	return BUFFER_BACK_LEFT;
		1630	case GLX_BACK_RIGHT_EXT:
		1631	return BUFFER_BACK_RIGHT;
		1632	case GLX_AUX0_EXT:
		1633	return BUFFER_AUX0;
		1634	case GLX_AUX1_EXT:
		1635	case GLX_AUX2_EXT:
		1636	case GLX_AUX3_EXT:
		1637	case GLX_AUX4_EXT:
		1638	case GLX_AUX5_EXT:
		1639	case GLX_AUX6_EXT:
		1640	case GLX_AUX7_EXT:
		1641	case GLX_AUX8_EXT:
		1642	case GLX_AUX9_EXT:
		1643	default:
		1644	/* BadValue error */
		1645	return -1;
		1646	}
		1647	}
		1648
		1649
		1650	PUBLIC void
		1651	XMesaBindTexImage(XMesaDisplay *dpy, XMesaBuffer drawable, int buffer,
		1652	const int *attrib_list)
		1653	{
		1654	#if 0
		1655	GET_CURRENT_CONTEXT(ctx);
		1656	const GLuint unit = ctx->Texture.CurrentUnit;
		1657	struct gl_texture_unit *texUnit = &ctx->Texture.Unit[unit];
		1658	struct gl_texture_object *texObj;
		1659	#endif
		1660	struct gl_renderbuffer *rb;
		1661	struct xmesa_renderbuffer *xrb;
		1662	GLint b;
		1663	XMesaImage *img = NULL;
		1664	GLboolean freeImg = GL_FALSE;
		1665
		1666	b = xbuffer_to_renderbuffer(buffer);
		1667	if (b < 0)
		1668	return;
		1669
		1670	if (drawable->TextureFormat == GLX_TEXTURE_FORMAT_NONE_EXT)
		1671	return; /* BadMatch error */
		1672
		1673	rb = drawable->mesa_buffer.Attachment[b].Renderbuffer;
		1674	if (!rb) {
		1675	/* invalid buffer */
		1676	return;
		1677	}
		1678	xrb = xmesa_renderbuffer(rb);
		1679
		1680	#if 0
		1681	switch (drawable->TextureTarget) {
		1682	case GLX_TEXTURE_1D_EXT:
		1683	texObj = texUnit->CurrentTex[TEXTURE_1D_INDEX];
		1684	break;
		1685	case GLX_TEXTURE_2D_EXT:
		1686	texObj = texUnit->CurrentTex[TEXTURE_2D_INDEX];
		1687	break;
		1688	case GLX_TEXTURE_RECTANGLE_EXT:
		1689	texObj = texUnit->CurrentTex[TEXTURE_RECT_INDEX];
		1690	break;
		1691	default:
		1692	return; /* BadMatch error */
		1693	}
		1694	#endif
		1695
		1696	/*
		1697	* The following is a quick and simple way to implement
		1698	* BindTexImage. The better way is to write some new FetchTexel()
		1699	* functions which would extract texels from XImages. We'd still
		1700	* need to use GetImage when texturing from a Pixmap (front buffer)
		1701	* but texturing from a back buffer (XImage) would avoid an image
		1702	* copy.
		1703	*/
		1704
		1705	/* get XImage */
		1706	if (xrb->pixmap) {
		1707	img = XMesaGetImage(dpy, xrb->pixmap, 0, 0, rb->Width, rb->Height, ~0L,
		1708	ZPixmap);
		1709	freeImg = GL_TRUE;
		1710	}
		1711	else if (xrb->ximage) {
		1712	img = xrb->ximage;
		1713	}
		1714
		1715	/* store the XImage as a new texture image */
		1716	if (img) {
		1717	GLenum format, type, intFormat;
		1718	if (img->bits_per_pixel == 32) {
		1719	format = GL_BGRA;
		1720	type = GL_UNSIGNED_BYTE;
		1721	intFormat = GL_RGBA;
		1722	}
		1723	else if (img->bits_per_pixel == 24) {
		1724	format = GL_BGR;
		1725	type = GL_UNSIGNED_BYTE;
		1726	intFormat = GL_RGB;
		1727	}
		1728	else if (img->bits_per_pixel == 16) {
		1729	format = GL_BGR;
		1730	type = GL_UNSIGNED_SHORT_5_6_5;
		1731	intFormat = GL_RGB;
		1732	}
		1733	else {
		1734	_mesa_problem(NULL, "Unexpected XImage format in XMesaBindTexImage");
		1735	return;
		1736	}
		1737	if (drawable->TextureFormat == GLX_TEXTURE_FORMAT_RGBA_EXT) {
		1738	intFormat = GL_RGBA;
		1739	}
		1740	else if (drawable->TextureFormat == GLX_TEXTURE_FORMAT_RGB_EXT) {
		1741	intFormat = GL_RGB;
		1742	}
		1743
		1744	_mesa_TexImage2D(GL_TEXTURE_2D, 0, intFormat, rb->Width, rb->Height, 0,
		1745	format, type, img->data);
		1746
		1747	if (freeImg) {
		1748	XMesaDestroyImage(img);
		1749	}
		1750	}
		1751	}
		1752
		1753
		1754
		1755	PUBLIC void
		1756	XMesaReleaseTexImage(XMesaDisplay *dpy, XMesaBuffer drawable, int buffer)
		1757	{
		1758	const GLint b = xbuffer_to_renderbuffer(buffer);
		1759	if (b < 0)
		1760	return;
		1761
		1762	/* no-op for now */
		1763	}
		1764

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(root)/contrib/sdk/sources/Mesa/src/mesa/drivers/x11/xm_api.c – Rev 4358