1 /*
2 * Mesa 3-D graphics library
3 * Version: 6.5.1
4 *
5 * Copyright (C) 1999-2006 Brian Paul All Rights Reserved.
6 * Copyright (c) 2008 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 texcompress.c
29 * Helper functions for texture compression.
30 */
31
32
33 #include "glheader.h"
34 #include "imports.h"
35 #include "colormac.h"
36 #include "formats.h"
37 #include "mfeatures.h"
38 #include "mtypes.h"
39 #include "texcompress.h"
40 #include "texcompress_fxt1.h"
41 #include "texcompress_rgtc.h"
42 #include "texcompress_s3tc.h"
43 #include "texcompress_etc.h"
44 #include "swrast/s_context.h"
45
46
47 /**
48 * Get the GL base format of a specified GL compressed texture format
49 *
50 * From page 232 of the OpenGL 3.3 (Compatiblity Profile) spec:
51 *
52 * "Compressed Internal Format Base Internal Format Type
53 * --------------------------- -------------------- ---------
54 * COMPRESSED_ALPHA ALPHA Generic
55 * COMPRESSED_LUMINANCE LUMINANCE Generic
56 * COMPRESSED_LUMINANCE_ALPHA LUMINANCE_ALPHA Generic
57 * COMPRESSED_INTENSITY INTENSITY Generic
58 * COMPRESSED_RED RED Generic
59 * COMPRESSED_RG RG Generic
60 * COMPRESSED_RGB RGB Generic
61 * COMPRESSED_RGBA RGBA Generic
62 * COMPRESSED_SRGB RGB Generic
63 * COMPRESSED_SRGB_ALPHA RGBA Generic
64 * COMPRESSED_SLUMINANCE LUMINANCE Generic
65 * COMPRESSED_SLUMINANCE_ALPHA LUMINANCE_ALPHA Generic
66 * COMPRESSED_RED_RGTC1 RED Specific
67 * COMPRESSED_SIGNED_RED_RGTC1 RED Specific
68 * COMPRESSED_RG_RGTC2 RG Specific
69 * COMPRESSED_SIGNED_RG_RGTC2 RG Specific"
70 *
71 * \return
72 * The base format of \c format if \c format is a compressed format (either
73 * generic or specific. Otherwise 0 is returned.
74 */
75 GLenum
_mesa_gl_compressed_format_base_format(GLenum format)76 _mesa_gl_compressed_format_base_format(GLenum format)
77 {
78 switch (format) {
79 case GL_COMPRESSED_RED:
80 case GL_COMPRESSED_RED_RGTC1:
81 case GL_COMPRESSED_SIGNED_RED_RGTC1:
82 return GL_RED;
83
84 case GL_COMPRESSED_RG:
85 case GL_COMPRESSED_RG_RGTC2:
86 case GL_COMPRESSED_SIGNED_RG_RGTC2:
87 return GL_RG;
88
89 case GL_COMPRESSED_RGB:
90 case GL_COMPRESSED_SRGB:
91 case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
92 case GL_COMPRESSED_RGB_FXT1_3DFX:
93 case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
94 case GL_ETC1_RGB8_OES:
95 return GL_RGB;
96
97 case GL_COMPRESSED_RGBA:
98 case GL_COMPRESSED_SRGB_ALPHA:
99 case GL_COMPRESSED_RGBA_BPTC_UNORM_ARB:
100 case GL_COMPRESSED_SRGB_ALPHA_BPTC_UNORM_ARB:
101 case GL_COMPRESSED_RGB_BPTC_SIGNED_FLOAT_ARB:
102 case GL_COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT_ARB:
103 case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
104 case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
105 case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
106 case GL_COMPRESSED_RGBA_FXT1_3DFX:
107 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
108 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
109 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
110 return GL_RGBA;
111
112 case GL_COMPRESSED_ALPHA:
113 return GL_ALPHA;
114
115 case GL_COMPRESSED_LUMINANCE:
116 case GL_COMPRESSED_SLUMINANCE:
117 case GL_COMPRESSED_LUMINANCE_LATC1_EXT:
118 case GL_COMPRESSED_SIGNED_LUMINANCE_LATC1_EXT:
119 return GL_LUMINANCE;
120
121 case GL_COMPRESSED_LUMINANCE_ALPHA:
122 case GL_COMPRESSED_SLUMINANCE_ALPHA:
123 case GL_COMPRESSED_LUMINANCE_ALPHA_LATC2_EXT:
124 case GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT:
125 case GL_COMPRESSED_LUMINANCE_ALPHA_3DC_ATI:
126 return GL_LUMINANCE_ALPHA;
127
128 case GL_COMPRESSED_INTENSITY:
129 return GL_INTENSITY;
130
131 default:
132 return 0;
133 }
134 }
135
136 /**
137 * Return list of (and count of) all specific texture compression
138 * formats that are supported.
139 *
140 * Some formats are \b not returned by this function. The
141 * \c GL_COMPRESSED_TEXTURE_FORMATS query only returns formats that are
142 * "suitable for general-purpose usage." All texture compression extensions
143 * have taken this to mean either linear RGB or linear RGBA.
144 *
145 * The GL_ARB_texture_compress_rgtc spec says:
146 *
147 * "19) Should the GL_NUM_COMPRESSED_TEXTURE_FORMATS and
148 * GL_COMPRESSED_TEXTURE_FORMATS queries return the RGTC formats?
149 *
150 * RESOLVED: No.
151 *
152 * The OpenGL 2.1 specification says "The only values returned
153 * by this query [GL_COMPRESSED_TEXTURE_FORMATS"] are those
154 * corresponding to formats suitable for general-purpose usage.
155 * The renderer will not enumerate formats with restrictions that
156 * need to be specifically understood prior to use."
157 *
158 * Compressed textures with just red or red-green components are
159 * not general-purpose so should not be returned by these queries
160 * because they have restrictions.
161 *
162 * Applications that seek to use the RGTC formats should do so
163 * by looking for this extension's name in the string returned by
164 * glGetString(GL_EXTENSIONS) rather than
165 * what GL_NUM_COMPRESSED_TEXTURE_FORMATS and
166 * GL_COMPRESSED_TEXTURE_FORMATS return."
167 *
168 * There is nearly identical wording in the GL_EXT_texture_compression_rgtc
169 * spec.
170 *
171 * The GL_EXT_texture_rRGB spec says:
172 *
173 * "22) Should the new COMPRESSED_SRGB_* formats be listed in an
174 * implementation's GL_COMPRESSED_TEXTURE_FORMATS list?
175 *
176 * RESOLVED: No. Section 3.8.1 says formats listed by
177 * GL_COMPRESSED_TEXTURE_FORMATS are "suitable for general-purpose
178 * usage." The non-linear distribution of red, green, and
179 * blue for these sRGB compressed formats makes them not really
180 * general-purpose."
181 *
182 * The GL_EXT_texture_compression_latc spec says:
183 *
184 * "16) Should the GL_NUM_COMPRESSED_TEXTURE_FORMATS and
185 * GL_COMPRESSED_TEXTURE_FORMATS queries return the LATC formats?
186 *
187 * RESOLVED: No.
188 *
189 * The OpenGL 2.1 specification says "The only values returned
190 * by this query [GL_COMPRESSED_TEXTURE_FORMATS"] are those
191 * corresponding to formats suitable for general-purpose usage.
192 * The renderer will not enumerate formats with restrictions that
193 * need to be specifically understood prior to use."
194 *
195 * Historically, OpenGL implementation have advertised the RGB and
196 * RGBA versions of the S3TC extensions compressed format tokens
197 * through this mechanism.
198 *
199 * The specification is not sufficiently clear about what "suitable
200 * for general-purpose usage" means. Historically that seems to mean
201 * unsigned RGB or unsigned RGBA. The DXT1 format supporting alpha
202 * (GL_COMPRESSED_RGBA_S3TC_DXT1_EXT) is not exposed in the list (at
203 * least for NVIDIA drivers) because the alpha is always 1.0 expect
204 * when it is 0.0 when RGB is required to be black. NVIDIA's even
205 * limits itself to true linear RGB or RGBA formats, specifically
206 * not including EXT_texture_sRGB's sRGB S3TC compressed formats.
207 *
208 * Adding luminance and luminance-alpha texture formats (and
209 * certainly signed versions of luminance and luminance-alpha
210 * formats!) invites potential comptaibility problems with old
211 * applications using this mechanism since old applications are
212 * unlikely to expect non-RGB or non-RGBA formats to be advertised
213 * through this mechanism. However no specific misinteractions
214 * with old applications is known.
215 *
216 * Applications that seek to use the LATC formats should do so
217 * by looking for this extension's name in the string returned by
218 * glGetString(GL_EXTENSIONS) rather than
219 * what GL_NUM_COMPRESSED_TEXTURE_FORMATS and
220 * GL_COMPRESSED_TEXTURE_FORMATS return."
221 *
222 * There is no formal spec for GL_ATI_texture_compression_3dc. Since the
223 * formats added by this extension are luminance-alpha formats, it is
224 * reasonable to expect them to follow the same rules as
225 * GL_EXT_texture_compression_latc. At the very least, Catalyst 11.6 does not
226 * expose the 3dc formats through this mechanism.
227 *
228 * \param ctx the GL context
229 * \param formats the resulting format list (may be NULL).
230 *
231 * \return number of formats.
232 */
233 GLuint
_mesa_get_compressed_formats(struct gl_context * ctx,GLint * formats)234 _mesa_get_compressed_formats(struct gl_context *ctx, GLint *formats)
235 {
236 GLuint n = 0;
237 if (ctx->Extensions.TDFX_texture_compression_FXT1) {
238 if (formats) {
239 formats[n++] = GL_COMPRESSED_RGB_FXT1_3DFX;
240 formats[n++] = GL_COMPRESSED_RGBA_FXT1_3DFX;
241 }
242 else {
243 n += 2;
244 }
245 }
246
247 if (ctx->Extensions.EXT_texture_compression_s3tc) {
248 if (formats) {
249 formats[n++] = GL_COMPRESSED_RGB_S3TC_DXT1_EXT;
250 formats[n++] = GL_COMPRESSED_RGBA_S3TC_DXT3_EXT;
251 formats[n++] = GL_COMPRESSED_RGBA_S3TC_DXT5_EXT;
252 }
253 else {
254 n += 3;
255 }
256 }
257 if (ctx->Extensions.S3_s3tc) {
258 if (formats) {
259 formats[n++] = GL_RGB_S3TC;
260 formats[n++] = GL_RGB4_S3TC;
261 formats[n++] = GL_RGBA_S3TC;
262 formats[n++] = GL_RGBA4_S3TC;
263 }
264 else {
265 n += 4;
266 }
267 }
268
269 if (ctx->Extensions.OES_compressed_ETC1_RGB8_texture) {
270 if (formats) {
271 formats[n++] = GL_ETC1_RGB8_OES;
272 }
273 else {
274 n += 1;
275 }
276 }
277
278 #if FEATURE_ES1
279 if (ctx->API == API_OPENGLES) {
280 if (formats) {
281 formats[n++] = GL_PALETTE4_RGB8_OES;
282 formats[n++] = GL_PALETTE4_RGBA8_OES;
283 formats[n++] = GL_PALETTE4_R5_G6_B5_OES;
284 formats[n++] = GL_PALETTE4_RGBA4_OES;
285 formats[n++] = GL_PALETTE4_RGB5_A1_OES;
286 formats[n++] = GL_PALETTE8_RGB8_OES;
287 formats[n++] = GL_PALETTE8_RGBA8_OES;
288 formats[n++] = GL_PALETTE8_R5_G6_B5_OES;
289 formats[n++] = GL_PALETTE8_RGBA4_OES;
290 formats[n++] = GL_PALETTE8_RGB5_A1_OES;
291 }
292 else {
293 n += 10;
294 }
295 }
296 #endif
297
298 return n;
299 }
300
301
302 /**
303 * Convert a compressed MESA_FORMAT_x to a GLenum.
304 */
305 gl_format
_mesa_glenum_to_compressed_format(GLenum format)306 _mesa_glenum_to_compressed_format(GLenum format)
307 {
308 switch (format) {
309 case GL_COMPRESSED_RGB_FXT1_3DFX:
310 return MESA_FORMAT_RGB_FXT1;
311 case GL_COMPRESSED_RGBA_FXT1_3DFX:
312 return MESA_FORMAT_RGBA_FXT1;
313
314 case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
315 case GL_RGB_S3TC:
316 return MESA_FORMAT_RGB_DXT1;
317 case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
318 case GL_RGB4_S3TC:
319 return MESA_FORMAT_RGBA_DXT1;
320 case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
321 case GL_RGBA_S3TC:
322 return MESA_FORMAT_RGBA_DXT3;
323 case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
324 case GL_RGBA4_S3TC:
325 return MESA_FORMAT_RGBA_DXT5;
326
327 case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
328 return MESA_FORMAT_SRGB_DXT1;
329 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
330 return MESA_FORMAT_SRGBA_DXT1;
331 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
332 return MESA_FORMAT_SRGBA_DXT3;
333 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
334 return MESA_FORMAT_SRGBA_DXT5;
335
336 case GL_COMPRESSED_RED_RGTC1:
337 return MESA_FORMAT_RED_RGTC1;
338 case GL_COMPRESSED_SIGNED_RED_RGTC1:
339 return MESA_FORMAT_SIGNED_RED_RGTC1;
340 case GL_COMPRESSED_RG_RGTC2:
341 return MESA_FORMAT_RG_RGTC2;
342 case GL_COMPRESSED_SIGNED_RG_RGTC2:
343 return MESA_FORMAT_SIGNED_RG_RGTC2;
344
345 case GL_COMPRESSED_LUMINANCE_LATC1_EXT:
346 return MESA_FORMAT_L_LATC1;
347 case GL_COMPRESSED_SIGNED_LUMINANCE_LATC1_EXT:
348 return MESA_FORMAT_SIGNED_L_LATC1;
349 case GL_COMPRESSED_LUMINANCE_ALPHA_LATC2_EXT:
350 case GL_COMPRESSED_LUMINANCE_ALPHA_3DC_ATI:
351 return MESA_FORMAT_LA_LATC2;
352 case GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT:
353 return MESA_FORMAT_SIGNED_LA_LATC2;
354
355 case GL_ETC1_RGB8_OES:
356 return MESA_FORMAT_ETC1_RGB8;
357
358 default:
359 return MESA_FORMAT_NONE;
360 }
361 }
362
363
364 /**
365 * Given a compressed MESA_FORMAT_x value, return the corresponding
366 * GLenum for that format.
367 * This is needed for glGetTexLevelParameter(GL_TEXTURE_INTERNAL_FORMAT)
368 * which must return the specific texture format used when the user might
369 * have originally specified a generic compressed format in their
370 * glTexImage2D() call.
371 * For non-compressed textures, we always return the user-specified
372 * internal format unchanged.
373 */
374 GLenum
_mesa_compressed_format_to_glenum(struct gl_context * ctx,gl_format mesaFormat)375 _mesa_compressed_format_to_glenum(struct gl_context *ctx, gl_format mesaFormat)
376 {
377 switch (mesaFormat) {
378 #if FEATURE_texture_fxt1
379 case MESA_FORMAT_RGB_FXT1:
380 return GL_COMPRESSED_RGB_FXT1_3DFX;
381 case MESA_FORMAT_RGBA_FXT1:
382 return GL_COMPRESSED_RGBA_FXT1_3DFX;
383 #endif
384 #if FEATURE_texture_s3tc
385 case MESA_FORMAT_RGB_DXT1:
386 return GL_COMPRESSED_RGB_S3TC_DXT1_EXT;
387 case MESA_FORMAT_RGBA_DXT1:
388 return GL_COMPRESSED_RGBA_S3TC_DXT1_EXT;
389 case MESA_FORMAT_RGBA_DXT3:
390 return GL_COMPRESSED_RGBA_S3TC_DXT3_EXT;
391 case MESA_FORMAT_RGBA_DXT5:
392 return GL_COMPRESSED_RGBA_S3TC_DXT5_EXT;
393 #if FEATURE_EXT_texture_sRGB
394 case MESA_FORMAT_SRGB_DXT1:
395 return GL_COMPRESSED_SRGB_S3TC_DXT1_EXT;
396 case MESA_FORMAT_SRGBA_DXT1:
397 return GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT;
398 case MESA_FORMAT_SRGBA_DXT3:
399 return GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT;
400 case MESA_FORMAT_SRGBA_DXT5:
401 return GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT;
402 #endif
403 #endif
404
405 case MESA_FORMAT_RED_RGTC1:
406 return GL_COMPRESSED_RED_RGTC1;
407 case MESA_FORMAT_SIGNED_RED_RGTC1:
408 return GL_COMPRESSED_SIGNED_RED_RGTC1;
409 case MESA_FORMAT_RG_RGTC2:
410 return GL_COMPRESSED_RG_RGTC2;
411 case MESA_FORMAT_SIGNED_RG_RGTC2:
412 return GL_COMPRESSED_SIGNED_RG_RGTC2;
413
414 case MESA_FORMAT_L_LATC1:
415 return GL_COMPRESSED_LUMINANCE_LATC1_EXT;
416 case MESA_FORMAT_SIGNED_L_LATC1:
417 return GL_COMPRESSED_SIGNED_LUMINANCE_LATC1_EXT;
418 case MESA_FORMAT_LA_LATC2:
419 return GL_COMPRESSED_LUMINANCE_ALPHA_LATC2_EXT;
420 case MESA_FORMAT_SIGNED_LA_LATC2:
421 return GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT;
422
423 case MESA_FORMAT_ETC1_RGB8:
424 return GL_ETC1_RGB8_OES;
425
426 default:
427 _mesa_problem(ctx, "Unexpected mesa texture format in"
428 " _mesa_compressed_format_to_glenum()");
429 return 0;
430 }
431 }
432
433
434 /*
435 * Return the address of the pixel at (col, row, img) in a
436 * compressed texture image.
437 * \param col, row, img - image position (3D), should be a multiple of the
438 * format's block size.
439 * \param format - compressed image format
440 * \param width - image width (stride) in pixels
441 * \param image - the image address
442 * \return address of pixel at (row, col, img)
443 */
444 GLubyte *
_mesa_compressed_image_address(GLint col,GLint row,GLint img,gl_format mesaFormat,GLsizei width,const GLubyte * image)445 _mesa_compressed_image_address(GLint col, GLint row, GLint img,
446 gl_format mesaFormat,
447 GLsizei width, const GLubyte *image)
448 {
449 /* XXX only 2D images implemented, not 3D */
450 const GLuint blockSize = _mesa_get_format_bytes(mesaFormat);
451 GLuint bw, bh;
452 GLint offset;
453
454 _mesa_get_format_block_size(mesaFormat, &bw, &bh);
455
456 ASSERT(col % bw == 0);
457 ASSERT(row % bh == 0);
458
459 offset = ((width + bw - 1) / bw) * (row / bh) + col / bw;
460 offset *= blockSize;
461
462 return (GLubyte *) image + offset;
463 }
464
465
466 /**
467 * Decompress a compressed texture image, returning a GL_RGBA/GL_FLOAT image.
468 * \param srcRowStride stride in bytes between rows of blocks in the
469 * compressed source image.
470 */
471 void
_mesa_decompress_image(gl_format format,GLuint width,GLuint height,const GLubyte * src,GLint srcRowStride,GLfloat * dest)472 _mesa_decompress_image(gl_format format, GLuint width, GLuint height,
473 const GLubyte *src, GLint srcRowStride,
474 GLfloat *dest)
475 {
476 void (*fetch)(const struct swrast_texture_image *texImage,
477 GLint i, GLint j, GLint k, GLfloat *texel);
478 struct swrast_texture_image texImage; /* dummy teximage */
479 GLuint i, j;
480 GLuint bytes, bw, bh;
481
482 bytes = _mesa_get_format_bytes(format);
483 _mesa_get_format_block_size(format, &bw, &bh);
484
485 /* setup dummy texture image info */
486 memset(&texImage, 0, sizeof(texImage));
487 texImage.Map = (void *) src;
488
489 /* XXX This line is a bit of a hack to adapt to the row stride
490 * convention used by the texture decompression functions.
491 */
492 texImage.RowStride = srcRowStride * bh / bytes;
493
494 switch (format) {
495 /* DXT formats */
496 case MESA_FORMAT_RGB_DXT1:
497 fetch = _mesa_fetch_texel_rgb_dxt1;
498 break;
499 case MESA_FORMAT_RGBA_DXT1:
500 fetch = _mesa_fetch_texel_rgba_dxt1;
501 break;
502 case MESA_FORMAT_RGBA_DXT3:
503 fetch = _mesa_fetch_texel_rgba_dxt3;
504 break;
505 case MESA_FORMAT_RGBA_DXT5:
506 fetch = _mesa_fetch_texel_rgba_dxt5;
507 break;
508
509 /* FXT1 formats */
510 case MESA_FORMAT_RGB_FXT1:
511 fetch = _mesa_fetch_texel_2d_f_rgb_fxt1;
512 break;
513 case MESA_FORMAT_RGBA_FXT1:
514 fetch = _mesa_fetch_texel_2d_f_rgba_fxt1;
515 break;
516
517 /* Red/RG formats */
518 case MESA_FORMAT_RED_RGTC1:
519 fetch = _mesa_fetch_texel_red_rgtc1;
520 break;
521 case MESA_FORMAT_SIGNED_RED_RGTC1:
522 fetch = _mesa_fetch_texel_signed_red_rgtc1;
523 break;
524 case MESA_FORMAT_RG_RGTC2:
525 fetch = _mesa_fetch_texel_rg_rgtc2;
526 break;
527 case MESA_FORMAT_SIGNED_RG_RGTC2:
528 fetch = _mesa_fetch_texel_signed_rg_rgtc2;
529 break;
530
531 /* L/LA formats */
532 case MESA_FORMAT_L_LATC1:
533 fetch = _mesa_fetch_texel_l_latc1;
534 break;
535 case MESA_FORMAT_SIGNED_L_LATC1:
536 fetch = _mesa_fetch_texel_signed_l_latc1;
537 break;
538 case MESA_FORMAT_LA_LATC2:
539 fetch = _mesa_fetch_texel_la_latc2;
540 break;
541 case MESA_FORMAT_SIGNED_LA_LATC2:
542 fetch = _mesa_fetch_texel_signed_la_latc2;
543 break;
544
545 /* ETC1 formats */
546 case MESA_FORMAT_ETC1_RGB8:
547 fetch = _mesa_fetch_texel_2d_f_etc1_rgb8;
548 break;
549
550 default:
551 _mesa_problem(NULL, "Unexpected format in _mesa_decompress_image()");
552 return;
553 }
554
555 for (j = 0; j < height; j++) {
556 for (i = 0; i < width; i++) {
557 fetch(&texImage, i, j, 0, dest);
558 dest += 4;
559 }
560 }
561 }
562