WebSVN – Kolibri OS – Blame – /programs/develop/libraries/Mesa/src/mesa/main/texfetch.c

Rev	Author	Line No.	Line
1901	serge	1	/*
		2	* Mesa 3-D graphics library
		3	* Version: 7.7
		4	*
		5	* Copyright (C) 1999-2008 Brian Paul All Rights Reserved.
		6	* Copyright (c) 2009 VMware, Inc.
		7	*
		8	* Permission is hereby granted, free of charge, to any person obtaining a
		9	* copy of this software and associated documentation files (the "Software"),
		10	* to deal in the Software without restriction, including without limitation
		11	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
		12	* and/or sell copies of the Software, and to permit persons to whom the
		13	* Software is furnished to do so, subject to the following conditions:
		14	*
		15	* The above copyright notice and this permission notice shall be included
		16	* in all copies or substantial portions of the Software.
		17	*
		18	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
		19	* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
		20	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
		21	* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
		22	* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
		23	* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
		24	*/
		25
		26
		27	/**
		28	* \file texfetch.c
		29	*
		30	* Texel fetch/store functions
		31	*
		32	* \author Gareth Hughes
		33	*/
		34
		35
		36	#include "colormac.h"
		37	#include "macros.h"
		38	#include "texcompress.h"
		39	#include "texcompress_fxt1.h"
		40	#include "texcompress_s3tc.h"
		41	#include "texfetch.h"
		42
		43
		44	/**
		45	* Convert an 8-bit sRGB value from non-linear space to a
		46	* linear RGB value in [0, 1].
		47	* Implemented with a 256-entry lookup table.
		48	*/
		49	static INLINE GLfloat
		50	nonlinear_to_linear(GLubyte cs8)
		51	{
		52	static GLfloat table[256];
		53	static GLboolean tableReady = GL_FALSE;
		54	if (!tableReady) {
		55	/* compute lookup table now */
		56	GLuint i;
		57	for (i = 0; i < 256; i++) {
		58	const GLfloat cs = UBYTE_TO_FLOAT(i);
		59	if (cs <= 0.04045) {
		60	table[i] = cs / 12.92f;
		61	}
		62	else {
		63	table[i] = (GLfloat) pow((cs + 0.055) / 1.055, 2.4);
		64	}
		65	}
		66	tableReady = GL_TRUE;
		67	}
		68	return table[cs8];
		69	}
		70
		71
		72
		73	/* Texel fetch routines for all supported formats
		74	*/
		75	#define DIM 1
		76	#include "texfetch_tmp.h"
		77
		78	#define DIM 2
		79	#include "texfetch_tmp.h"
		80
		81	#define DIM 3
		82	#include "texfetch_tmp.h"
		83
		84	/**
		85	* Null texel fetch function.
		86	*
		87	* Have to have this so the FetchTexel function pointer is never NULL.
		88	*/
		89	static void fetch_null_texelf( const struct gl_texture_image *texImage,
		90	GLint i, GLint j, GLint k, GLfloat *texel )
		91	{
		92	(void) texImage; (void) i; (void) j; (void) k;
		93	texel[RCOMP] = 0.0;
		94	texel[GCOMP] = 0.0;
		95	texel[BCOMP] = 0.0;
		96	texel[ACOMP] = 0.0;
		97	_mesa_warning(NULL, "fetch_null_texelf() called!");
		98	}
		99
		100	static void store_null_texel(struct gl_texture_image *texImage,
		101	GLint i, GLint j, GLint k, const void *texel)
		102	{
		103	(void) texImage;
		104	(void) i;
		105	(void) j;
		106	(void) k;
		107	(void) texel;
		108	/* no-op */
		109	}
		110
		111
		112
		113	/**
		114	* Table to map MESA_FORMAT_ to texel fetch/store funcs.
		115	* XXX this is somewhat temporary.
		116	*/
		117	static struct {
		118	gl_format Name;
		119	FetchTexelFuncF Fetch1D;
		120	FetchTexelFuncF Fetch2D;
		121	FetchTexelFuncF Fetch3D;
		122	StoreTexelFunc StoreTexel;
		123	}
		124	texfetch_funcs[MESA_FORMAT_COUNT] =
		125	{
		126	{
		127	MESA_FORMAT_NONE,
		128	fetch_null_texelf,
		129	fetch_null_texelf,
		130	fetch_null_texelf,
		131	store_null_texel
		132	},
		133
		134	{
		135	MESA_FORMAT_RGBA8888,
		136	fetch_texel_1d_f_rgba8888,
		137	fetch_texel_2d_f_rgba8888,
		138	fetch_texel_3d_f_rgba8888,
		139	store_texel_rgba8888
		140	},
		141	{
		142	MESA_FORMAT_RGBA8888_REV,
		143	fetch_texel_1d_f_rgba8888_rev,
		144	fetch_texel_2d_f_rgba8888_rev,
		145	fetch_texel_3d_f_rgba8888_rev,
		146	store_texel_rgba8888_rev
		147	},
		148	{
		149	MESA_FORMAT_ARGB8888,
		150	fetch_texel_1d_f_argb8888,
		151	fetch_texel_2d_f_argb8888,
		152	fetch_texel_3d_f_argb8888,
		153	store_texel_argb8888
		154	},
		155	{
		156	MESA_FORMAT_ARGB8888_REV,
		157	fetch_texel_1d_f_argb8888_rev,
		158	fetch_texel_2d_f_argb8888_rev,
		159	fetch_texel_3d_f_argb8888_rev,
		160	store_texel_argb8888_rev
		161	},
		162	{
		163	MESA_FORMAT_XRGB8888,
		164	fetch_texel_1d_f_xrgb8888,
		165	fetch_texel_2d_f_xrgb8888,
		166	fetch_texel_3d_f_xrgb8888,
		167	store_texel_xrgb8888
		168	},
		169	{
		170	MESA_FORMAT_XRGB8888_REV,
		171	fetch_texel_1d_f_xrgb8888_rev,
		172	fetch_texel_2d_f_xrgb8888_rev,
		173	fetch_texel_3d_f_xrgb8888_rev,
		174	store_texel_xrgb8888_rev,
		175	},
		176	{
		177	MESA_FORMAT_RGB888,
		178	fetch_texel_1d_f_rgb888,
		179	fetch_texel_2d_f_rgb888,
		180	fetch_texel_3d_f_rgb888,
		181	store_texel_rgb888
		182	},
		183	{
		184	MESA_FORMAT_BGR888,
		185	fetch_texel_1d_f_bgr888,
		186	fetch_texel_2d_f_bgr888,
		187	fetch_texel_3d_f_bgr888,
		188	store_texel_bgr888
		189	},
		190	{
		191	MESA_FORMAT_RGB565,
		192	fetch_texel_1d_f_rgb565,
		193	fetch_texel_2d_f_rgb565,
		194	fetch_texel_3d_f_rgb565,
		195	store_texel_rgb565
		196	},
		197	{
		198	MESA_FORMAT_RGB565_REV,
		199	fetch_texel_1d_f_rgb565_rev,
		200	fetch_texel_2d_f_rgb565_rev,
		201	fetch_texel_3d_f_rgb565_rev,
		202	store_texel_rgb565_rev
		203	},
		204	{
		205	MESA_FORMAT_ARGB4444,
		206	fetch_texel_1d_f_argb4444,
		207	fetch_texel_2d_f_argb4444,
		208	fetch_texel_3d_f_argb4444,
		209	store_texel_argb4444
		210	},
		211	{
		212	MESA_FORMAT_ARGB4444_REV,
		213	fetch_texel_1d_f_argb4444_rev,
		214	fetch_texel_2d_f_argb4444_rev,
		215	fetch_texel_3d_f_argb4444_rev,
		216	store_texel_argb4444_rev
		217	},
		218	{
		219	MESA_FORMAT_RGBA5551,
		220	fetch_texel_1d_f_rgba5551,
		221	fetch_texel_2d_f_rgba5551,
		222	fetch_texel_3d_f_rgba5551,
		223	store_texel_rgba5551
		224	},
		225	{
		226	MESA_FORMAT_ARGB1555,
		227	fetch_texel_1d_f_argb1555,
		228	fetch_texel_2d_f_argb1555,
		229	fetch_texel_3d_f_argb1555,
		230	store_texel_argb1555
		231	},
		232	{
		233	MESA_FORMAT_ARGB1555_REV,
		234	fetch_texel_1d_f_argb1555_rev,
		235	fetch_texel_2d_f_argb1555_rev,
		236	fetch_texel_3d_f_argb1555_rev,
		237	store_texel_argb1555_rev
		238	},
		239	{
		240	MESA_FORMAT_AL88,
		241	fetch_texel_1d_f_al88,
		242	fetch_texel_2d_f_al88,
		243	fetch_texel_3d_f_al88,
		244	store_texel_al88
		245	},
		246	{
		247	MESA_FORMAT_AL88_REV,
		248	fetch_texel_1d_f_al88_rev,
		249	fetch_texel_2d_f_al88_rev,
		250	fetch_texel_3d_f_al88_rev,
		251	store_texel_al88_rev
		252	},
		253	{
		254	MESA_FORMAT_AL1616,
		255	fetch_texel_1d_f_al1616,
		256	fetch_texel_2d_f_al1616,
		257	fetch_texel_3d_f_al1616,
		258	store_texel_al1616
		259	},
		260	{
		261	MESA_FORMAT_AL1616_REV,
		262	fetch_texel_1d_f_al1616_rev,
		263	fetch_texel_2d_f_al1616_rev,
		264	fetch_texel_3d_f_al1616_rev,
		265	store_texel_al1616_rev
		266	},
		267	{
		268	MESA_FORMAT_RGB332,
		269	fetch_texel_1d_f_rgb332,
		270	fetch_texel_2d_f_rgb332,
		271	fetch_texel_3d_f_rgb332,
		272	store_texel_rgb332
		273	},
		274	{
		275	MESA_FORMAT_A8,
		276	fetch_texel_1d_f_a8,
		277	fetch_texel_2d_f_a8,
		278	fetch_texel_3d_f_a8,
		279	store_texel_a8
		280	},
		281	{
		282	MESA_FORMAT_L8,
		283	fetch_texel_1d_f_l8,
		284	fetch_texel_2d_f_l8,
		285	fetch_texel_3d_f_l8,
		286	store_texel_l8
		287	},
		288	{
		289	MESA_FORMAT_I8,
		290	fetch_texel_1d_f_i8,
		291	fetch_texel_2d_f_i8,
		292	fetch_texel_3d_f_i8,
		293	store_texel_i8
		294	},
		295	{
		296	MESA_FORMAT_CI8,
		297	fetch_texel_1d_f_ci8,
		298	fetch_texel_2d_f_ci8,
		299	fetch_texel_3d_f_ci8,
		300	store_texel_ci8
		301	},
		302	{
		303	MESA_FORMAT_YCBCR,
		304	fetch_texel_1d_f_ycbcr,
		305	fetch_texel_2d_f_ycbcr,
		306	fetch_texel_3d_f_ycbcr,
		307	store_texel_ycbcr
		308	},
		309	{
		310	MESA_FORMAT_YCBCR_REV,
		311	fetch_texel_1d_f_ycbcr_rev,
		312	fetch_texel_2d_f_ycbcr_rev,
		313	fetch_texel_3d_f_ycbcr_rev,
		314	store_texel_ycbcr_rev
		315	},
		316	{
		317	MESA_FORMAT_R8,
		318	fetch_texel_1d_f_r8,
		319	fetch_texel_2d_f_r8,
		320	fetch_texel_3d_f_r8,
		321	store_texel_r8,
		322	},
		323	{
		324	MESA_FORMAT_RG88,
		325	fetch_texel_1d_f_rg88,
		326	fetch_texel_2d_f_rg88,
		327	fetch_texel_3d_f_rg88,
		328	store_texel_rg88,
		329	},
		330	{
		331	MESA_FORMAT_RG88_REV,
		332	fetch_texel_1d_f_rg88_rev,
		333	fetch_texel_2d_f_rg88_rev,
		334	fetch_texel_3d_f_rg88_rev,
		335	store_texel_rg88_rev,
		336	},
		337	{
		338	MESA_FORMAT_R16,
		339	fetch_texel_1d_f_r16,
		340	fetch_texel_2d_f_r16,
		341	fetch_texel_3d_f_r16,
		342	store_texel_r16,
		343	},
		344	{
		345	MESA_FORMAT_RG1616,
		346	fetch_texel_1d_f_rg1616,
		347	fetch_texel_2d_f_rg1616,
		348	fetch_texel_3d_f_rg1616,
		349	store_texel_rg1616,
		350	},
		351	{
		352	MESA_FORMAT_RG1616_REV,
		353	fetch_texel_1d_f_rg1616_rev,
		354	fetch_texel_2d_f_rg1616_rev,
		355	fetch_texel_3d_f_rg1616_rev,
		356	store_texel_rg1616_rev,
		357	},
		358	{
		359	MESA_FORMAT_Z24_S8,
		360	fetch_texel_1d_f_z24_s8,
		361	fetch_texel_2d_f_z24_s8,
		362	fetch_texel_3d_f_z24_s8,
		363	store_texel_z24_s8
		364	},
		365	{
		366	MESA_FORMAT_S8_Z24,
		367	fetch_texel_1d_f_s8_z24,
		368	fetch_texel_2d_f_s8_z24,
		369	fetch_texel_3d_f_s8_z24,
		370	store_texel_s8_z24
		371	},
		372	{
		373	MESA_FORMAT_Z16,
		374	fetch_texel_1d_f_z16,
		375	fetch_texel_2d_f_z16,
		376	fetch_texel_3d_f_z16,
		377	store_texel_z16
		378	},
		379	{
		380	MESA_FORMAT_X8_Z24,
		381	fetch_texel_1d_f_s8_z24,
		382	fetch_texel_2d_f_s8_z24,
		383	fetch_texel_3d_f_s8_z24,
		384	store_texel_s8_z24
		385	},
		386	{
		387	MESA_FORMAT_Z24_X8,
		388	fetch_texel_1d_f_z24_s8,
		389	fetch_texel_2d_f_z24_s8,
		390	fetch_texel_3d_f_z24_s8,
		391	store_texel_z24_s8
		392	},
		393	{
		394	MESA_FORMAT_Z32,
		395	fetch_texel_1d_f_z32,
		396	fetch_texel_2d_f_z32,
		397	fetch_texel_3d_f_z32,
		398	store_texel_z32
		399	},
		400	{
		401	MESA_FORMAT_S8,
		402	NULL,
		403	NULL,
		404	NULL,
		405	NULL
		406	},
		407	{
		408	MESA_FORMAT_SRGB8,
		409	fetch_texel_1d_srgb8,
		410	fetch_texel_2d_srgb8,
		411	fetch_texel_3d_srgb8,
		412	store_texel_srgb8
		413	},
		414	{
		415	MESA_FORMAT_SRGBA8,
		416	fetch_texel_1d_srgba8,
		417	fetch_texel_2d_srgba8,
		418	fetch_texel_3d_srgba8,
		419	store_texel_srgba8
		420	},
		421	{
		422	MESA_FORMAT_SARGB8,
		423	fetch_texel_1d_sargb8,
		424	fetch_texel_2d_sargb8,
		425	fetch_texel_3d_sargb8,
		426	store_texel_sargb8
		427	},
		428	{
		429	MESA_FORMAT_SL8,
		430	fetch_texel_1d_sl8,
		431	fetch_texel_2d_sl8,
		432	fetch_texel_3d_sl8,
		433	store_texel_sl8
		434	},
		435	{
		436	MESA_FORMAT_SLA8,
		437	fetch_texel_1d_sla8,
		438	fetch_texel_2d_sla8,
		439	fetch_texel_3d_sla8,
		440	store_texel_sla8
		441	},
		442	{
		443	MESA_FORMAT_SRGB_DXT1,
		444	NULL,
		445	_mesa_fetch_texel_2d_f_srgb_dxt1,
		446	NULL,
		447	NULL
		448	},
		449	{
		450	MESA_FORMAT_SRGBA_DXT1,
		451	NULL,
		452	_mesa_fetch_texel_2d_f_srgba_dxt1,
		453	NULL,
		454	NULL
		455	},
		456	{
		457	MESA_FORMAT_SRGBA_DXT3,
		458	NULL,
		459	_mesa_fetch_texel_2d_f_srgba_dxt3,
		460	NULL,
		461	NULL
		462	},
		463	{
		464	MESA_FORMAT_SRGBA_DXT5,
		465	NULL,
		466	_mesa_fetch_texel_2d_f_srgba_dxt5,
		467	NULL,
		468	NULL
		469	},
		470
		471	{
		472	MESA_FORMAT_RGB_FXT1,
		473	NULL,
		474	_mesa_fetch_texel_2d_f_rgb_fxt1,
		475	NULL,
		476	NULL
		477	},
		478	{
		479	MESA_FORMAT_RGBA_FXT1,
		480	NULL,
		481	_mesa_fetch_texel_2d_f_rgba_fxt1,
		482	NULL,
		483	NULL
		484	},
		485	{
		486	MESA_FORMAT_RGB_DXT1,
		487	NULL,
		488	_mesa_fetch_texel_2d_f_rgb_dxt1,
		489	NULL,
		490	NULL
		491	},
		492	{
		493	MESA_FORMAT_RGBA_DXT1,
		494	NULL,
		495	_mesa_fetch_texel_2d_f_rgba_dxt1,
		496	NULL,
		497	NULL
		498	},
		499	{
		500	MESA_FORMAT_RGBA_DXT3,
		501	NULL,
		502	_mesa_fetch_texel_2d_f_rgba_dxt3,
		503	NULL,
		504	NULL
		505	},
		506	{
		507	MESA_FORMAT_RGBA_DXT5,
		508	NULL,
		509	_mesa_fetch_texel_2d_f_rgba_dxt5,
		510	NULL,
		511	NULL
		512	},
		513	{
		514	MESA_FORMAT_RGBA_FLOAT32,
		515	fetch_texel_1d_f_rgba_f32,
		516	fetch_texel_2d_f_rgba_f32,
		517	fetch_texel_3d_f_rgba_f32,
		518	store_texel_rgba_f32
		519	},
		520	{
		521	MESA_FORMAT_RGBA_FLOAT16,
		522	fetch_texel_1d_f_rgba_f16,
		523	fetch_texel_2d_f_rgba_f16,
		524	fetch_texel_3d_f_rgba_f16,
		525	store_texel_rgba_f16
		526	},
		527	{
		528	MESA_FORMAT_RGB_FLOAT32,
		529	fetch_texel_1d_f_rgb_f32,
		530	fetch_texel_2d_f_rgb_f32,
		531	fetch_texel_3d_f_rgb_f32,
		532	store_texel_rgb_f32
		533	},
		534	{
		535	MESA_FORMAT_RGB_FLOAT16,
		536	fetch_texel_1d_f_rgb_f16,
		537	fetch_texel_2d_f_rgb_f16,
		538	fetch_texel_3d_f_rgb_f16,
		539	store_texel_rgb_f16
		540	},
		541	{
		542	MESA_FORMAT_ALPHA_FLOAT32,
		543	fetch_texel_1d_f_alpha_f32,
		544	fetch_texel_2d_f_alpha_f32,
		545	fetch_texel_3d_f_alpha_f32,
		546	store_texel_alpha_f32
		547	},
		548	{
		549	MESA_FORMAT_ALPHA_FLOAT16,
		550	fetch_texel_1d_f_alpha_f16,
		551	fetch_texel_2d_f_alpha_f16,
		552	fetch_texel_3d_f_alpha_f16,
		553	store_texel_alpha_f16
		554	},
		555	{
		556	MESA_FORMAT_LUMINANCE_FLOAT32,
		557	fetch_texel_1d_f_luminance_f32,
		558	fetch_texel_2d_f_luminance_f32,
		559	fetch_texel_3d_f_luminance_f32,
		560	store_texel_luminance_f32
		561	},
		562	{
		563	MESA_FORMAT_LUMINANCE_FLOAT16,
		564	fetch_texel_1d_f_luminance_f16,
		565	fetch_texel_2d_f_luminance_f16,
		566	fetch_texel_3d_f_luminance_f16,
		567	store_texel_luminance_f16
		568	},
		569	{
		570	MESA_FORMAT_LUMINANCE_ALPHA_FLOAT32,
		571	fetch_texel_1d_f_luminance_alpha_f32,
		572	fetch_texel_2d_f_luminance_alpha_f32,
		573	fetch_texel_3d_f_luminance_alpha_f32,
		574	store_texel_luminance_alpha_f32
		575	},
		576	{
		577	MESA_FORMAT_LUMINANCE_ALPHA_FLOAT16,
		578	fetch_texel_1d_f_luminance_alpha_f16,
		579	fetch_texel_2d_f_luminance_alpha_f16,
		580	fetch_texel_3d_f_luminance_alpha_f16,
		581	store_texel_luminance_alpha_f16
		582	},
		583	{
		584	MESA_FORMAT_INTENSITY_FLOAT32,
		585	fetch_texel_1d_f_intensity_f32,
		586	fetch_texel_2d_f_intensity_f32,
		587	fetch_texel_3d_f_intensity_f32,
		588	store_texel_intensity_f32
		589	},
		590	{
		591	MESA_FORMAT_INTENSITY_FLOAT16,
		592	fetch_texel_1d_f_intensity_f16,
		593	fetch_texel_2d_f_intensity_f16,
		594	fetch_texel_3d_f_intensity_f16,
		595	store_texel_intensity_f16
		596	},
		597
		598	/* non-normalized, signed int */
		599	{
		600	MESA_FORMAT_RGBA_INT8,
		601	fetch_texel_1d_rgba_int8,
		602	fetch_texel_2d_rgba_int8,
		603	fetch_texel_3d_rgba_int8,
		604	store_texel_rgba_int8
		605	},
		606	{
		607	MESA_FORMAT_RGBA_INT16,
		608	fetch_texel_1d_rgba_int16,
		609	fetch_texel_2d_rgba_int16,
		610	fetch_texel_3d_rgba_int16,
		611	store_texel_rgba_int16
		612	},
		613	{
		614	MESA_FORMAT_RGBA_INT32,
		615	fetch_texel_1d_rgba_int32,
		616	fetch_texel_2d_rgba_int32,
		617	fetch_texel_3d_rgba_int32,
		618	store_texel_rgba_int32
		619	},
		620
		621	/* non-normalized, unsigned int */
		622	{
		623	MESA_FORMAT_RGBA_UINT8,
		624	fetch_texel_1d_rgba_uint8,
		625	fetch_texel_2d_rgba_uint8,
		626	fetch_texel_3d_rgba_uint8,
		627	store_texel_rgba_uint8
		628	},
		629	{
		630	MESA_FORMAT_RGBA_UINT16,
		631	fetch_texel_1d_rgba_uint16,
		632	fetch_texel_2d_rgba_uint16,
		633	fetch_texel_3d_rgba_uint16,
		634	store_texel_rgba_uint16
		635	},
		636	{
		637	MESA_FORMAT_RGBA_UINT32,
		638	fetch_texel_1d_rgba_uint32,
		639	fetch_texel_2d_rgba_uint32,
		640	fetch_texel_3d_rgba_uint32,
		641	store_texel_rgba_uint32
		642	},
		643
		644	/* dudv */
		645	{
		646	MESA_FORMAT_DUDV8,
		647	fetch_texel_1d_dudv8,
		648	fetch_texel_2d_dudv8,
		649	fetch_texel_3d_dudv8,
		650	NULL
		651	},
		652
		653	/* signed, normalized */
		654	{
		655	MESA_FORMAT_SIGNED_R8,
		656	fetch_texel_1d_signed_r8,
		657	fetch_texel_2d_signed_r8,
		658	fetch_texel_3d_signed_r8,
		659	store_texel_signed_r8
		660	},
		661	{
		662	MESA_FORMAT_SIGNED_RG88,
		663	fetch_texel_1d_signed_rg88,
		664	fetch_texel_2d_signed_rg88,
		665	fetch_texel_3d_signed_rg88,
		666	store_texel_signed_rg88
		667	},
		668	{
		669	MESA_FORMAT_SIGNED_RGBX8888,
		670	fetch_texel_1d_signed_rgbx8888,
		671	fetch_texel_2d_signed_rgbx8888,
		672	fetch_texel_3d_signed_rgbx8888,
		673	store_texel_signed_rgbx8888
		674	},
		675	{
		676	MESA_FORMAT_SIGNED_RGBA8888,
		677	fetch_texel_1d_signed_rgba8888,
		678	fetch_texel_2d_signed_rgba8888,
		679	fetch_texel_3d_signed_rgba8888,
		680	store_texel_signed_rgba8888
		681	},
		682	{
		683	MESA_FORMAT_SIGNED_RGBA8888_REV,
		684	fetch_texel_1d_signed_rgba8888_rev,
		685	fetch_texel_2d_signed_rgba8888_rev,
		686	fetch_texel_3d_signed_rgba8888_rev,
		687	store_texel_signed_rgba8888_rev
		688	},
		689	{
		690	MESA_FORMAT_SIGNED_R_16,
		691	fetch_texel_1d_signed_r_16,
		692	fetch_texel_2d_signed_r_16,
		693	fetch_texel_3d_signed_r_16,
		694	store_texel_signed_r_16
		695	},
		696	{
		697	MESA_FORMAT_SIGNED_RG_16,
		698	fetch_texel_1d_signed_rg_16,
		699	fetch_texel_2d_signed_rg_16,
		700	fetch_texel_3d_signed_rg_16,
		701	store_texel_signed_rg_16
		702	},
		703	{
		704	MESA_FORMAT_SIGNED_RGB_16,
		705	fetch_texel_1d_signed_rgb_16,
		706	fetch_texel_2d_signed_rgb_16,
		707	fetch_texel_3d_signed_rgb_16,
		708	store_texel_signed_rgb_16
		709	},
		710	{
		711	MESA_FORMAT_SIGNED_RGBA_16,
		712	fetch_texel_1d_signed_rgba_16,
		713	fetch_texel_2d_signed_rgba_16,
		714	fetch_texel_3d_signed_rgba_16,
		715	store_texel_signed_rgba_16
		716	},
		717	{
		718	MESA_FORMAT_RGBA_16,
		719	fetch_texel_1d_rgba_16,
		720	fetch_texel_2d_rgba_16,
		721	fetch_texel_3d_rgba_16,
		722	store_texel_rgba_16
		723	}
		724	};
		725
		726
		727	static FetchTexelFuncF
		728	_mesa_get_texel_fetch_func(gl_format format, GLuint dims)
		729	{
		730	#ifdef DEBUG
		731	/* check that the table entries are sorted by format name */
		732	gl_format fmt;
		733	for (fmt = 0; fmt < MESA_FORMAT_COUNT; fmt++) {
		734	assert(texfetch_funcs[fmt].Name == fmt);
		735	}
		736	#endif
		737
		738	assert(Elements(texfetch_funcs) == MESA_FORMAT_COUNT);
		739	assert(format < MESA_FORMAT_COUNT);
		740
		741	switch (dims) {
		742	case 1:
		743	return texfetch_funcs[format].Fetch1D;
		744	case 2:
		745	return texfetch_funcs[format].Fetch2D;
		746	case 3:
		747	return texfetch_funcs[format].Fetch3D;
		748	default:
		749	assert(0 && "bad dims in _mesa_get_texel_fetch_func");
		750	return NULL;
		751	}
		752	}
		753
		754
		755	StoreTexelFunc
		756	_mesa_get_texel_store_func(gl_format format)
		757	{
		758	assert(format < MESA_FORMAT_COUNT);
		759	return texfetch_funcs[format].StoreTexel;
		760	}
		761
		762
		763	/**
		764	* Adaptor for fetching a GLchan texel from a float-valued texture.
		765	*/
		766	static void
		767	fetch_texel_float_to_chan(const struct gl_texture_image *texImage,
		768	GLint i, GLint j, GLint k, GLchan *texelOut)
		769	{
		770	GLfloat temp[4];
		771	GLenum baseFormat = _mesa_get_format_base_format(texImage->TexFormat);
		772
		773	ASSERT(texImage->FetchTexelf);
		774	texImage->FetchTexelf(texImage, i, j, k, temp);
		775	if (baseFormat == GL_DEPTH_COMPONENT \|\|
		776	baseFormat == GL_DEPTH_STENCIL_EXT) {
		777	/* just one channel */
		778	UNCLAMPED_FLOAT_TO_CHAN(texelOut[0], temp[0]);
		779	}
		780	else {
		781	/* four channels */
		782	UNCLAMPED_FLOAT_TO_CHAN(texelOut[0], temp[0]);
		783	UNCLAMPED_FLOAT_TO_CHAN(texelOut[1], temp[1]);
		784	UNCLAMPED_FLOAT_TO_CHAN(texelOut[2], temp[2]);
		785	UNCLAMPED_FLOAT_TO_CHAN(texelOut[3], temp[3]);
		786	}
		787	}
		788
		789
		790	#if 0
		791	/**
		792	* Adaptor for fetching a float texel from a GLchan-valued texture.
		793	*/
		794	static void
		795	fetch_texel_chan_to_float(const struct gl_texture_image *texImage,
		796	GLint i, GLint j, GLint k, GLfloat *texelOut)
		797	{
		798	GLchan temp[4];
		799	GLenum baseFormat = _mesa_get_format_base_format(texImage->TexFormat);
		800
		801	ASSERT(texImage->FetchTexelc);
		802	texImage->FetchTexelc(texImage, i, j, k, temp);
		803	if (baseFormat == GL_DEPTH_COMPONENT \|\|
		804	baseFormat == GL_DEPTH_STENCIL_EXT) {
		805	/* just one channel */
		806	texelOut[0] = CHAN_TO_FLOAT(temp[0]);
		807	}
		808	else {
		809	/* four channels */
		810	texelOut[0] = CHAN_TO_FLOAT(temp[0]);
		811	texelOut[1] = CHAN_TO_FLOAT(temp[1]);
		812	texelOut[2] = CHAN_TO_FLOAT(temp[2]);
		813	texelOut[3] = CHAN_TO_FLOAT(temp[3]);
		814	}
		815	}
		816	#endif
		817
		818
		819	/**
		820	* Initialize the texture image's FetchTexelc and FetchTexelf methods.
		821	*/
		822	void
		823	_mesa_set_fetch_functions(struct gl_texture_image *texImage, GLuint dims)
		824	{
		825	ASSERT(dims == 1 \|\| dims == 2 \|\| dims == 3);
		826
		827	texImage->FetchTexelf =
		828	_mesa_get_texel_fetch_func(texImage->TexFormat, dims);
		829
		830	texImage->FetchTexelc = fetch_texel_float_to_chan;
		831
		832	ASSERT(texImage->FetchTexelc);
		833	ASSERT(texImage->FetchTexelf);
		834	}

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(root)/programs/develop/libraries/Mesa/src/mesa/main/texfetch.c – Rev 2783