WebSVN - shark - Blame - Rev 1618 - /shark/branches/xen/ports/mesa/src/texformat.c

Rev	Author	Line No.	Line
135	giacomo	1	/* $Id: texformat.c,v 1.2 2003-04-24 14:22:20 giacomo Exp $ */
55	pj	2
		3	/*
		4	* Mesa 3-D graphics library
		5	* Version: 3.5
		6	*
		7	* Copyright (C) 1999-2001 Brian Paul All Rights Reserved.
		8	*
		9	* Permission is hereby granted, free of charge, to any person obtaining a
		10	* copy of this software and associated documentation files (the "Software"),
		11	* to deal in the Software without restriction, including without limitation
		12	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
		13	* and/or sell copies of the Software, and to permit persons to whom the
		14	* Software is furnished to do so, subject to the following conditions:
		15	*
		16	* The above copyright notice and this permission notice shall be included
		17	* in all copies or substantial portions of the Software.
		18	*
		19	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
		20	* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
		21	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
		22	* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
		23	* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
		24	* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
		25	*
		26	* Author:
		27	* Gareth Hughes
		28	*/
		29
		30	#include "glheader.h"
		31	#include "colormac.h"
		32	#include "context.h"
		33	#include "image.h"
		34	#include "imports.h"
		35	#include "mmath.h"
		36	#include "mtypes.h"
		37	#include "texformat.h"
		38	#include "teximage.h"
		39	#include "texstate.h"
		40
		41
		42	/* Texel fetch routines for all supported formats:
		43	*/
		44	#define DIM 1
135	giacomo	45	#include "tmp_texformat.h"
55	pj	46
		47	#define DIM 2
135	giacomo	48	#include "tmp_texformat.h"
55	pj	49
		50	#define DIM 3
135	giacomo	51	#include "tmp_texformat.h"
55	pj	52
		53	/* Have to have this so the FetchTexel function pointer is never NULL.
		54	*/
		55	static void fetch_null_texel( const struct gl_texture_image *texImage,
		56	GLint i, GLint j, GLint k, GLvoid *texel )
		57	{
		58	GLchan rgba = (GLchan ) texel;
		59	rgba[RCOMP] = 0;
		60	rgba[GCOMP] = 0;
		61	rgba[BCOMP] = 0;
		62	rgba[ACOMP] = 0;
		63	}
		64
		65
		66	/* =============================================================
		67	* Default GLchan-based formats:
		68	*/
		69
		70	const struct gl_texture_format _mesa_texformat_rgba = {
		71	MESA_FORMAT_RGBA, /* MesaFormat */
		72	GL_RGBA, /* BaseFormat */
		73	CHAN_BITS, /* RedBits */
		74	CHAN_BITS, /* GreenBits */
		75	CHAN_BITS, /* BlueBits */
		76	CHAN_BITS, /* AlphaBits */
		77	0, /* LuminanceBits */
		78	0, /* IntensityBits */
		79	0, /* IndexBits */
		80	0, /* DepthBits */
		81	4 * CHAN_BITS / 8, /* TexelBytes */
		82	fetch_1d_texel_rgba, /* FetchTexel1D */
		83	fetch_2d_texel_rgba, /* FetchTexel2D */
		84	fetch_3d_texel_rgba, /* FetchTexel3D */
		85	};
		86
		87	const struct gl_texture_format _mesa_texformat_rgb = {
		88	MESA_FORMAT_RGB, /* MesaFormat */
		89	GL_RGB, /* BaseFormat */
		90	CHAN_BITS, /* RedBits */
		91	CHAN_BITS, /* GreenBits */
		92	CHAN_BITS, /* BlueBits */
		93	0, /* AlphaBits */
		94	0, /* LuminanceBits */
		95	0, /* IntensityBits */
		96	0, /* IndexBits */
		97	0, /* DepthBits */
		98	3 * CHAN_BITS / 8, /* TexelBytes */
		99	fetch_1d_texel_rgb, /* FetchTexel1D */
		100	fetch_2d_texel_rgb, /* FetchTexel2D */
		101	fetch_3d_texel_rgb, /* FetchTexel3D */
		102	};
		103
		104	const struct gl_texture_format _mesa_texformat_alpha = {
		105	MESA_FORMAT_ALPHA, /* MesaFormat */
		106	GL_ALPHA, /* BaseFormat */
		107	0, /* RedBits */
		108	0, /* GreenBits */
		109	0, /* BlueBits */
		110	CHAN_BITS, /* AlphaBits */
		111	0, /* LuminanceBits */
		112	0, /* IntensityBits */
		113	0, /* IndexBits */
		114	0, /* DepthBits */
		115	CHAN_BITS / 8, /* TexelBytes */
		116	fetch_1d_texel_alpha, /* FetchTexel1D */
		117	fetch_2d_texel_alpha, /* FetchTexel2D */
		118	fetch_3d_texel_alpha, /* FetchTexel3D */
		119	};
		120
		121	const struct gl_texture_format _mesa_texformat_luminance = {
		122	MESA_FORMAT_LUMINANCE, /* MesaFormat */
		123	GL_LUMINANCE, /* BaseFormat */
		124	0, /* RedBits */
		125	0, /* GreenBits */
		126	0, /* BlueBits */
		127	0, /* AlphaBits */
		128	CHAN_BITS, /* LuminanceBits */
		129	0, /* IntensityBits */
		130	0, /* IndexBits */
		131	0, /* DepthBits */
		132	CHAN_BITS / 8, /* TexelBytes */
		133	fetch_1d_texel_luminance, /* FetchTexel1D */
		134	fetch_2d_texel_luminance, /* FetchTexel2D */
		135	fetch_3d_texel_luminance, /* FetchTexel3D */
		136	};
		137
		138	const struct gl_texture_format _mesa_texformat_luminance_alpha = {
		139	MESA_FORMAT_LUMINANCE_ALPHA, /* MesaFormat */
		140	GL_LUMINANCE_ALPHA, /* BaseFormat */
		141	0, /* RedBits */
		142	0, /* GreenBits */
		143	0, /* BlueBits */
		144	CHAN_BITS, /* AlphaBits */
		145	CHAN_BITS, /* LuminanceBits */
		146	0, /* IntensityBits */
		147	0, /* IndexBits */
		148	0, /* DepthBits */
		149	2 * CHAN_BITS / 8, /* TexelBytes */
		150	fetch_1d_texel_luminance_alpha, /* FetchTexel1D */
		151	fetch_2d_texel_luminance_alpha, /* FetchTexel2D */
		152	fetch_3d_texel_luminance_alpha, /* FetchTexel3D */
		153	};
		154
		155	const struct gl_texture_format _mesa_texformat_intensity = {
		156	MESA_FORMAT_INTENSITY, /* MesaFormat */
		157	GL_INTENSITY, /* BaseFormat */
		158	0, /* RedBits */
		159	0, /* GreenBits */
		160	0, /* BlueBits */
		161	0, /* AlphaBits */
		162	0, /* LuminanceBits */
		163	CHAN_BITS, /* IntensityBits */
		164	0, /* IndexBits */
		165	0, /* DepthBits */
		166	CHAN_BITS / 8, /* TexelBytes */
		167	fetch_1d_texel_intensity, /* FetchTexel1D */
		168	fetch_2d_texel_intensity, /* FetchTexel2D */
		169	fetch_3d_texel_intensity, /* FetchTexel3D */
		170	};
		171
		172	const struct gl_texture_format _mesa_texformat_color_index = {
		173	MESA_FORMAT_COLOR_INDEX, /* MesaFormat */
		174	GL_COLOR_INDEX, /* BaseFormat */
		175	0, /* RedBits */
		176	0, /* GreenBits */
		177	0, /* BlueBits */
		178	0, /* AlphaBits */
		179	0, /* LuminanceBits */
		180	0, /* IntensityBits */
		181	CHAN_BITS, /* IndexBits */
		182	0, /* DepthBits */
		183	CHAN_BITS / 8, /* TexelBytes */
		184	fetch_1d_texel_color_index, /* FetchTexel1D */
		185	fetch_2d_texel_color_index, /* FetchTexel2D */
		186	fetch_3d_texel_color_index, /* FetchTexel3D */
		187	};
		188
		189	const struct gl_texture_format _mesa_texformat_depth_component = {
		190	MESA_FORMAT_DEPTH_COMPONENT, /* MesaFormat */
		191	GL_DEPTH_COMPONENT, /* BaseFormat */
		192	0, /* RedBits */
		193	0, /* GreenBits */
		194	0, /* BlueBits */
		195	0, /* AlphaBits */
		196	0, /* LuminanceBits */
		197	0, /* IntensityBits */
		198	0, /* IndexBits */
		199	sizeof(GLfloat) * 8, /* DepthBits */
		200	sizeof(GLfloat), /* TexelBytes */
		201	fetch_1d_texel_depth_component, /* FetchTexel1D */
		202	fetch_2d_texel_depth_component, /* FetchTexel2D */
		203	fetch_3d_texel_depth_component, /* FetchTexel3D */
		204	};
		205
		206
		207	/* =============================================================
		208	* Hardware formats:
		209	*/
		210
		211	const struct gl_texture_format _mesa_texformat_rgba8888 = {
		212	MESA_FORMAT_RGBA8888, /* MesaFormat */
		213	GL_RGBA, /* BaseFormat */
		214	8, /* RedBits */
		215	8, /* GreenBits */
		216	8, /* BlueBits */
		217	8, /* AlphaBits */
		218	0, /* LuminanceBits */
		219	0, /* IntensityBits */
		220	0, /* IndexBits */
		221	0, /* DepthBits */
		222	4, /* TexelBytes */
		223	fetch_1d_texel_rgba8888, /* FetchTexel1D */
		224	fetch_2d_texel_rgba8888, /* FetchTexel2D */
		225	fetch_3d_texel_rgba8888, /* FetchTexel3D */
		226	};
		227
		228	const struct gl_texture_format _mesa_texformat_argb8888 = {
		229	MESA_FORMAT_ARGB8888, /* MesaFormat */
		230	GL_RGBA, /* BaseFormat */
		231	8, /* RedBits */
		232	8, /* GreenBits */
		233	8, /* BlueBits */
		234	8, /* AlphaBits */
		235	0, /* LuminanceBits */
		236	0, /* IntensityBits */
		237	0, /* IndexBits */
		238	0, /* DepthBits */
		239	4, /* TexelBytes */
		240	fetch_1d_texel_argb8888, /* FetchTexel1D */
		241	fetch_2d_texel_argb8888, /* FetchTexel2D */
		242	fetch_3d_texel_argb8888, /* FetchTexel3D */
		243	};
		244
		245	const struct gl_texture_format _mesa_texformat_rgb888 = {
		246	MESA_FORMAT_RGB888, /* MesaFormat */
		247	GL_RGB, /* BaseFormat */
		248	8, /* RedBits */
		249	8, /* GreenBits */
		250	8, /* BlueBits */
		251	0, /* AlphaBits */
		252	0, /* LuminanceBits */
		253	0, /* IntensityBits */
		254	0, /* IndexBits */
		255	0, /* DepthBits */
		256	3, /* TexelBytes */
		257	fetch_1d_texel_rgb888, /* FetchTexel1D */
		258	fetch_2d_texel_rgb888, /* FetchTexel2D */
		259	fetch_3d_texel_rgb888, /* FetchTexel3D */
		260	};
		261
		262	const struct gl_texture_format _mesa_texformat_rgb565 = {
		263	MESA_FORMAT_RGB565, /* MesaFormat */
		264	GL_RGB, /* BaseFormat */
		265	5, /* RedBits */
		266	6, /* GreenBits */
		267	5, /* BlueBits */
		268	0, /* AlphaBits */
		269	0, /* LuminanceBits */
		270	0, /* IntensityBits */
		271	0, /* IndexBits */
		272	0, /* DepthBits */
		273	2, /* TexelBytes */
		274	fetch_1d_texel_rgb565, /* FetchTexel1D */
		275	fetch_2d_texel_rgb565, /* FetchTexel2D */
		276	fetch_3d_texel_rgb565, /* FetchTexel3D */
		277	};
		278
		279	const struct gl_texture_format _mesa_texformat_argb4444 = {
		280	MESA_FORMAT_ARGB4444, /* MesaFormat */
		281	GL_RGBA, /* BaseFormat */
		282	4, /* RedBits */
		283	4, /* GreenBits */
		284	4, /* BlueBits */
		285	4, /* AlphaBits */
		286	0, /* LuminanceBits */
		287	0, /* IntensityBits */
		288	0, /* IndexBits */
		289	0, /* DepthBits */
		290	2, /* TexelBytes */
		291	fetch_1d_texel_argb4444, /* FetchTexel1D */
		292	fetch_2d_texel_argb4444, /* FetchTexel2D */
		293	fetch_3d_texel_argb4444, /* FetchTexel3D */
		294	};
		295
		296	const struct gl_texture_format _mesa_texformat_argb1555 = {
		297	MESA_FORMAT_ARGB1555, /* MesaFormat */
		298	GL_RGBA, /* BaseFormat */
		299	5, /* RedBits */
		300	5, /* GreenBits */
		301	5, /* BlueBits */
		302	1, /* AlphaBits */
		303	0, /* LuminanceBits */
		304	0, /* IntensityBits */
		305	0, /* IndexBits */
		306	0, /* DepthBits */
		307	2, /* TexelBytes */
		308	fetch_1d_texel_argb1555, /* FetchTexel1D */
		309	fetch_2d_texel_argb1555, /* FetchTexel2D */
		310	fetch_3d_texel_argb1555, /* FetchTexel3D */
		311	};
		312
		313	const struct gl_texture_format _mesa_texformat_al88 = {
		314	MESA_FORMAT_AL88, /* MesaFormat */
		315	GL_LUMINANCE_ALPHA, /* BaseFormat */
		316	0, /* RedBits */
		317	0, /* GreenBits */
		318	0, /* BlueBits */
		319	8, /* AlphaBits */
		320	8, /* LuminanceBits */
		321	0, /* IntensityBits */
		322	0, /* IndexBits */
		323	0, /* DepthBits */
		324	2, /* TexelBytes */
		325	fetch_1d_texel_al88, /* FetchTexel1D */
		326	fetch_2d_texel_al88, /* FetchTexel2D */
		327	fetch_3d_texel_al88, /* FetchTexel3D */
		328	};
		329
		330	const struct gl_texture_format _mesa_texformat_rgb332 = {
		331	MESA_FORMAT_RGB332, /* MesaFormat */
		332	GL_RGB, /* BaseFormat */
		333	3, /* RedBits */
		334	3, /* GreenBits */
		335	2, /* BlueBits */
		336	0, /* AlphaBits */
		337	0, /* LuminanceBits */
		338	0, /* IntensityBits */
		339	0, /* IndexBits */
		340	0, /* DepthBits */
		341	1, /* TexelBytes */
		342	fetch_1d_texel_rgb332, /* FetchTexel1D */
		343	fetch_2d_texel_rgb332, /* FetchTexel2D */
		344	fetch_3d_texel_rgb332, /* FetchTexel3D */
		345	};
		346
		347	const struct gl_texture_format _mesa_texformat_a8 = {
		348	MESA_FORMAT_A8, /* MesaFormat */
		349	GL_ALPHA, /* BaseFormat */
		350	0, /* RedBits */
		351	0, /* GreenBits */
		352	0, /* BlueBits */
		353	8, /* AlphaBits */
		354	0, /* LuminanceBits */
		355	0, /* IntensityBits */
		356	0, /* IndexBits */
		357	0, /* DepthBits */
		358	1, /* TexelBytes */
		359	fetch_1d_texel_a8, /* FetchTexel1D */
		360	fetch_2d_texel_a8, /* FetchTexel2D */
		361	fetch_3d_texel_a8, /* FetchTexel3D */
		362	};
		363
		364	const struct gl_texture_format _mesa_texformat_l8 = {
		365	MESA_FORMAT_L8, /* MesaFormat */
		366	GL_LUMINANCE, /* BaseFormat */
		367	0, /* RedBits */
		368	0, /* GreenBits */
		369	0, /* BlueBits */
		370	0, /* AlphaBits */
		371	8, /* LuminanceBits */
		372	0, /* IntensityBits */
		373	0, /* IndexBits */
		374	0, /* DepthBits */
		375	1, /* TexelBytes */
		376	fetch_1d_texel_l8, /* FetchTexel1D */
		377	fetch_2d_texel_l8, /* FetchTexel2D */
		378	fetch_3d_texel_l8, /* FetchTexel3D */
		379	};
		380
		381	const struct gl_texture_format _mesa_texformat_i8 = {
		382	MESA_FORMAT_I8, /* MesaFormat */
		383	GL_INTENSITY, /* BaseFormat */
		384	0, /* RedBits */
		385	0, /* GreenBits */
		386	0, /* BlueBits */
		387	0, /* AlphaBits */
		388	0, /* LuminanceBits */
		389	8, /* IntensityBits */
		390	0, /* IndexBits */
		391	0, /* DepthBits */
		392	1, /* TexelBytes */
		393	fetch_1d_texel_i8, /* FetchTexel1D */
		394	fetch_2d_texel_i8, /* FetchTexel2D */
		395	fetch_3d_texel_i8, /* FetchTexel3D */
		396	};
		397
		398	const struct gl_texture_format _mesa_texformat_ci8 = {
		399	MESA_FORMAT_CI8, /* MesaFormat */
		400	GL_COLOR_INDEX, /* BaseFormat */
		401	0, /* RedBits */
		402	0, /* GreenBits */
		403	0, /* BlueBits */
		404	0, /* AlphaBits */
		405	0, /* LuminanceBits */
		406	0, /* IntensityBits */
		407	8, /* IndexBits */
		408	0, /* DepthBits */
		409	1, /* TexelBytes */
		410	fetch_1d_texel_ci8, /* FetchTexel1D */
		411	fetch_2d_texel_ci8, /* FetchTexel2D */
		412	fetch_3d_texel_ci8, /* FetchTexel3D */
		413	};
		414
		415	const struct gl_texture_format _mesa_texformat_ycbcr = {
		416	MESA_FORMAT_YCBCR, /* MesaFormat */
		417	GL_YCBCR_MESA, /* BaseFormat */
		418	0, /* RedBits */
		419	0, /* GreenBits */
		420	0, /* BlueBits */
		421	0, /* AlphaBits */
		422	0, /* LuminanceBits */
		423	0, /* IntensityBits */
		424	0, /* IndexBits */
		425	0, /* DepthBits */
		426	2, /* TexelBytes */
		427	fetch_1d_texel_ycbcr, /* FetchTexel1D */
		428	fetch_2d_texel_ycbcr, /* FetchTexel2D */
		429	fetch_3d_texel_ycbcr, /* FetchTexel3D */
		430	};
		431
		432
		433	const struct gl_texture_format _mesa_texformat_ycbcr_rev = {
		434	MESA_FORMAT_YCBCR_REV, /* MesaFormat */
		435	GL_YCBCR_MESA, /* BaseFormat */
		436	0, /* RedBits */
		437	0, /* GreenBits */
		438	0, /* BlueBits */
		439	0, /* AlphaBits */
		440	0, /* LuminanceBits */
		441	0, /* IntensityBits */
		442	0, /* IndexBits */
		443	0, /* DepthBits */
		444	2, /* TexelBytes */
		445	fetch_1d_texel_ycbcr_rev, /* FetchTexel1D */
		446	fetch_2d_texel_ycbcr_rev, /* FetchTexel2D */
		447	fetch_3d_texel_ycbcr_rev, /* FetchTexel3D */
		448	};
		449
		450
		451	/* Big-endian */
		452	#if 0
		453	const struct gl_texture_format _mesa_texformat_abgr8888 = {
		454	MESA_FORMAT_ABGR8888, /* MesaFormat */
		455	GL_RGBA, /* BaseFormat */
		456	GL_UNSIGNED_INT_8_8_8_8, /* Type */
		457	8, /* RedBits */
		458	8, /* GreenBits */
		459	8, /* BlueBits */
		460	8, /* AlphaBits */
		461	0, /* LuminanceBits */
		462	0, /* IntensityBits */
		463	0, /* IndexBits */
		464	0, /* DepthBits */
		465	4, /* TexelBytes */
		466	fetch_1d_texel_abgr8888, /* FetchTexel1D */
		467	fetch_2d_texel_abgr8888, /* FetchTexel2D */
		468	fetch_3d_texel_abgr8888, /* FetchTexel3D */
		469	};
		470
		471	const struct gl_texture_format _mesa_texformat_bgra8888 = {
		472	MESA_FORMAT_BGRA8888, /* MesaFormat */
		473	GL_RGBA, /* BaseFormat */
		474	GL_UNSIGNED_INT_8_8_8_8, /* Type */
		475	8, /* RedBits */
		476	8, /* GreenBits */
		477	8, /* BlueBits */
		478	8, /* AlphaBits */
		479	0, /* LuminanceBits */
		480	0, /* IntensityBits */
		481	0, /* IndexBits */
		482	0, /* DepthBits */
		483	4, /* TexelBytes */
		484	fetch_1d_texel_bgra8888, /* FetchTexel1D */
		485	fetch_2d_texel_bgra8888, /* FetchTexel2D */
		486	fetch_3d_texel_bgra8888, /* FetchTexel3D */
		487	};
		488
		489	const struct gl_texture_format _mesa_texformat_bgr888 = {
		490	MESA_FORMAT_BGR888, /* MesaFormat */
		491	GL_RGB, /* BaseFormat */
		492	GL_UNSIGNED_BYTE, /* Type */
		493	8, /* RedBits */
		494	8, /* GreenBits */
		495	8, /* BlueBits */
		496	0, /* AlphaBits */
		497	0, /* LuminanceBits */
		498	0, /* IntensityBits */
		499	0, /* IndexBits */
		500	0, /* DepthBits */
		501	3, /* TexelBytes */
		502	fetch_1d_texel_bgr888, /* FetchTexel1D */
		503	fetch_2d_texel_bgr888, /* FetchTexel2D */
		504	fetch_3d_texel_bgr888, /* FetchTexel3D */
		505	};
		506
		507	const struct gl_texture_format _mesa_texformat_bgr565 = {
		508	MESA_FORMAT_BGR565, /* MesaFormat */
		509	GL_RGB, /* BaseFormat */
		510	GL_UNSIGNED_SHORT_5_6_5, /* Type */
		511	5, /* RedBits */
		512	6, /* GreenBits */
		513	5, /* BlueBits */
		514	0, /* AlphaBits */
		515	0, /* LuminanceBits */
		516	0, /* IntensityBits */
		517	0, /* IndexBits */
		518	0, /* DepthBits */
		519	2, /* TexelBytes */
		520	fetch_1d_texel_bgr565, /* FetchTexel1D */
		521	fetch_2d_texel_bgr565, /* FetchTexel2D */
		522	fetch_3d_texel_bgr565, /* FetchTexel3D */
		523	};
		524
		525	const struct gl_texture_format _mesa_texformat_bgra4444 = {
		526	MESA_FORMAT_BGRA4444, /* MesaFormat */
		527	GL_RGBA, /* BaseFormat */
		528	GL_UNSIGNED_SHORT_4_4_4_4_REV, /* Type */
		529	4, /* RedBits */
		530	4, /* GreenBits */
		531	4, /* BlueBits */
		532	4, /* AlphaBits */
		533	0, /* LuminanceBits */
		534	0, /* IntensityBits */
		535	0, /* IndexBits */
		536	0, /* DepthBits */
		537	2, /* TexelBytes */
		538	fetch_1d_texel_bgra4444, /* FetchTexel1D */
		539	fetch_2d_texel_bgra4444, /* FetchTexel2D */
		540	fetch_3d_texel_bgra4444, /* FetchTexel3D */
		541	};
		542
		543	const struct gl_texture_format _mesa_texformat_bgra5551 = {
		544	MESA_FORMAT_BGRA5551, /* MesaFormat */
		545	GL_RGBA, /* BaseFormat */
		546	GL_UNSIGNED_SHORT_1_5_5_5_REV, /* Type */
		547	5, /* RedBits */
		548	5, /* GreenBits */
		549	5, /* BlueBits */
		550	1, /* AlphaBits */
		551	0, /* LuminanceBits */
		552	0, /* IntensityBits */
		553	0, /* IndexBits */
		554	0, /* DepthBits */
		555	2, /* TexelBytes */
		556	fetch_1d_texel_bgra1555, /* FetchTexel1D */
		557	fetch_2d_texel_bgra1555, /* FetchTexel2D */
		558	fetch_3d_texel_bgra1555, /* FetchTexel3D */
		559	};
		560
		561	const struct gl_texture_format _mesa_texformat_la88 = {
		562	MESA_FORMAT_LA88, /* MesaFormat */
		563	GL_LUMINANCE_ALPHA, /* BaseFormat */
		564	GL_UNSIGNED_BYTE, /* Type */
		565	0, /* RedBits */
		566	0, /* GreenBits */
		567	0, /* BlueBits */
		568	8, /* AlphaBits */
		569	8, /* LuminanceBits */
		570	0, /* IntensityBits */
		571	0, /* IndexBits */
		572	0, /* DepthBits */
		573	2, /* TexelBytes */
		574	fetch_1d_texel_la88, /* FetchTexel1D */
		575	fetch_2d_texel_la88, /* FetchTexel2D */
		576	fetch_3d_texel_la88, /* FetchTexel3D */
		577	};
		578
		579	const struct gl_texture_format _mesa_texformat_bgr233 = {
		580	MESA_FORMAT_BGR233, /* MesaFormat */
		581	GL_RGB, /* BaseFormat */
		582	GL_UNSIGNED_BYTE_3_3_2, /* Type */
		583	3, /* RedBits */
		584	3, /* GreenBits */
		585	2, /* BlueBits */
		586	0, /* AlphaBits */
		587	0, /* LuminanceBits */
		588	0, /* IntensityBits */
		589	0, /* IndexBits */
		590	0, /* DepthBits */
		591	1, /* TexelBytes */
		592	fetch_1d_texel_bgr233, /* FetchTexel1D */
		593	fetch_2d_texel_bgr233, /* FetchTexel2D */
		594	fetch_3d_texel_bgr233, /* FetchTexel3D */
		595	};
		596	#endif
		597
		598	/* =============================================================
		599	* Null format (useful for proxy textures):
		600	*/
		601
		602	const struct gl_texture_format _mesa_null_texformat = {
		603	-1, /* MesaFormat */
		604	0, /* BaseFormat */
		605	0, /* RedBits */
		606	0, /* GreenBits */
		607	0, /* BlueBits */
		608	0, /* AlphaBits */
		609	0, /* LuminanceBits */
		610	0, /* IntensityBits */
		611	0, /* IndexBits */
		612	0, /* DepthBits */
		613	0, /* TexelBytes */
		614	fetch_null_texel, /* FetchTexel1D */
		615	fetch_null_texel, /* FetchTexel2D */
		616	fetch_null_texel, /* FetchTexel3D */
		617	};
		618
		619
		620	GLboolean
		621	_mesa_is_hardware_tex_format( const struct gl_texture_format *format )
		622	{
		623	return (format->MesaFormat < MESA_FORMAT_RGBA);
		624	}
		625
		626
		627	/* Given an internal texture format (or 1, 2, 3, 4) return a pointer
		628	* to a gl_texture_format which which to store the texture.
		629	* This is called via ctx->Driver.ChooseTextureFormat().
		630	* Hardware drivers typically override this function with a specialized
		631	* version.
		632	*/
		633	const struct gl_texture_format *
		634	_mesa_choose_tex_format( GLcontext *ctx, GLint internalFormat,
		635	GLenum format, GLenum type )
		636	{
		637	(void) format;
		638	(void) type;
		639
		640	switch ( internalFormat ) {
		641	/* GH: Bias towards GL_RGB, GL_RGBA texture formats. This has
		642	* got to be better than sticking them way down the end of this
		643	* huge list.
		644	*/
		645	case 4: /* Quake3 uses this... */
		646	case GL_RGBA:
		647	return &_mesa_texformat_rgba;
		648
		649	case 3: /* ... and this. */
		650	case GL_RGB:
		651	return &_mesa_texformat_rgb;
		652
		653	/* GH: Okay, keep checking as normal. Still test for GL_RGB,
		654	* GL_RGBA formats first.
		655	*/
		656	case GL_RGBA2:
		657	case GL_RGBA4:
		658	case GL_RGB5_A1:
		659	case GL_RGBA8:
		660	case GL_RGB10_A2:
		661	case GL_RGBA12:
		662	case GL_RGBA16:
		663	return &_mesa_texformat_rgba;
		664
		665	case GL_R3_G3_B2:
		666	case GL_RGB4:
		667	case GL_RGB5:
		668	case GL_RGB8:
		669	case GL_RGB10:
		670	case GL_RGB12:
		671	case GL_RGB16:
		672	return &_mesa_texformat_rgb;
		673
		674	case GL_ALPHA:
		675	case GL_ALPHA4:
		676	case GL_ALPHA8:
		677	case GL_ALPHA12:
		678	case GL_ALPHA16:
		679	return &_mesa_texformat_alpha;
		680
		681	case 1:
		682	case GL_LUMINANCE:
		683	case GL_LUMINANCE4:
		684	case GL_LUMINANCE8:
		685	case GL_LUMINANCE12:
		686	case GL_LUMINANCE16:
		687	return &_mesa_texformat_luminance;
		688
		689	case 2:
		690	case GL_LUMINANCE_ALPHA:
		691	case GL_LUMINANCE4_ALPHA4:
		692	case GL_LUMINANCE6_ALPHA2:
		693	case GL_LUMINANCE8_ALPHA8:
		694	case GL_LUMINANCE12_ALPHA4:
		695	case GL_LUMINANCE12_ALPHA12:
		696	case GL_LUMINANCE16_ALPHA16:
		697	return &_mesa_texformat_luminance_alpha;
		698
		699	case GL_INTENSITY:
		700	case GL_INTENSITY4:
		701	case GL_INTENSITY8:
		702	case GL_INTENSITY12:
		703	case GL_INTENSITY16:
		704	return &_mesa_texformat_intensity;
		705
		706	case GL_COLOR_INDEX:
		707	case GL_COLOR_INDEX1_EXT:
		708	case GL_COLOR_INDEX2_EXT:
		709	case GL_COLOR_INDEX4_EXT:
		710	case GL_COLOR_INDEX8_EXT:
		711	case GL_COLOR_INDEX12_EXT:
		712	case GL_COLOR_INDEX16_EXT:
		713	return &_mesa_texformat_color_index;
		714
		715	case GL_DEPTH_COMPONENT:
		716	case GL_DEPTH_COMPONENT16_SGIX:
		717	case GL_DEPTH_COMPONENT24_SGIX:
		718	case GL_DEPTH_COMPONENT32_SGIX:
		719	if (!ctx->Extensions.SGIX_depth_texture)
		720	_mesa_problem(ctx, "depth format without GL_SGIX_depth_texture");
		721	return &_mesa_texformat_depth_component;
		722
		723	case GL_COMPRESSED_ALPHA_ARB:
		724	if (!ctx->Extensions.ARB_texture_compression)
		725	_mesa_problem(ctx, "texture compression extension not enabled");
		726	return &_mesa_texformat_alpha;
		727	case GL_COMPRESSED_LUMINANCE_ARB:
		728	if (!ctx->Extensions.ARB_texture_compression)
		729	_mesa_problem(ctx, "texture compression extension not enabled");
		730	return &_mesa_texformat_luminance;
		731	case GL_COMPRESSED_LUMINANCE_ALPHA_ARB:
		732	if (!ctx->Extensions.ARB_texture_compression)
		733	_mesa_problem(ctx, "texture compression extension not enabled");
		734	return &_mesa_texformat_luminance_alpha;
		735	case GL_COMPRESSED_INTENSITY_ARB:
		736	if (!ctx->Extensions.ARB_texture_compression)
		737	_mesa_problem(ctx, "texture compression extension not enabled");
		738	return &_mesa_texformat_intensity;
		739	case GL_COMPRESSED_RGB_ARB:
		740	if (!ctx->Extensions.ARB_texture_compression)
		741	_mesa_problem(ctx, "texture compression extension not enabled");
		742	return &_mesa_texformat_rgb;
		743	case GL_COMPRESSED_RGBA_ARB:
		744	if (!ctx->Extensions.ARB_texture_compression)
		745	_mesa_problem(ctx, "texture compression extension not enabled");
		746	return &_mesa_texformat_rgba;
		747
		748	/* GL_MESA_ycrcr_texture */
		749	case GL_YCBCR_MESA:
		750	if (type == GL_UNSIGNED_SHORT_8_8_MESA)
		751	return &_mesa_texformat_ycbcr;
		752	else
		753	return &_mesa_texformat_ycbcr_rev;
		754
		755	default:
		756	_mesa_problem(ctx, "unexpected format in _mesa_choose_tex_format()");
		757	return NULL;
		758	}
		759	}
		760
		761
		762
		763
		764	/*
		765	* Return the base texture format for the given compressed format
		766	* Called via ctx->Driver.BaseCompressedTexFormat().
		767	* This function is used by software rasterizers. Hardware drivers
		768	* which support texture compression should not use this function but
		769	* a specialized function instead.
		770	*/
		771	GLint
		772	_mesa_base_compressed_texformat(GLcontext *ctx, GLint intFormat)
		773	{
		774	switch (intFormat) {
		775	case GL_COMPRESSED_ALPHA_ARB:
		776	return GL_ALPHA;
		777	case GL_COMPRESSED_LUMINANCE_ARB:
		778	return GL_LUMINANCE;
		779	case GL_COMPRESSED_LUMINANCE_ALPHA_ARB:
		780	return GL_LUMINANCE_ALPHA;
		781	case GL_COMPRESSED_INTENSITY_ARB:
		782	return GL_INTENSITY;
		783	case GL_COMPRESSED_RGB_ARB:
		784	return GL_RGB;
		785	case GL_COMPRESSED_RGBA_ARB:
		786	return GL_RGBA;
		787	default:
		788	return -1; /* not a recognized compressed format */
		789	}
		790	}

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