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mesa: Add missing include guards
[mesa.git] / src / mesa / main / texcompress.c
1 /*
2 * Mesa 3-D graphics library
3 *
4 * Copyright (C) 1999-2006 Brian Paul All Rights Reserved.
5 * Copyright (c) 2008 VMware, Inc.
6 *
7 * Permission is hereby granted, free of charge, to any person obtaining a
8 * copy of this software and associated documentation files (the "Software"),
9 * to deal in the Software without restriction, including without limitation
10 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
11 * and/or sell copies of the Software, and to permit persons to whom the
12 * Software is furnished to do so, subject to the following conditions:
13 *
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
21 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
22 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
23 * 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 "context.h"
36 #include "formats.h"
37 #include "mtypes.h"
38 #include "context.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 "texcompress_bptc.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
76 _mesa_gl_compressed_format_base_format(GLenum format)
77 {
78 switch (format) {
79 case GL_COMPRESSED_RED:
80 case GL_COMPRESSED_R11_EAC:
81 case GL_COMPRESSED_RED_RGTC1:
82 case GL_COMPRESSED_SIGNED_R11_EAC:
83 case GL_COMPRESSED_SIGNED_RED_RGTC1:
84 return GL_RED;
85
86 case GL_COMPRESSED_RG:
87 case GL_COMPRESSED_RG11_EAC:
88 case GL_COMPRESSED_RG_RGTC2:
89 case GL_COMPRESSED_SIGNED_RG11_EAC:
90 case GL_COMPRESSED_SIGNED_RG_RGTC2:
91 return GL_RG;
92
93 case GL_COMPRESSED_RGB:
94 case GL_COMPRESSED_SRGB:
95 case GL_COMPRESSED_RGB_BPTC_SIGNED_FLOAT_ARB:
96 case GL_COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT_ARB:
97 case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
98 case GL_COMPRESSED_RGB_FXT1_3DFX:
99 case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
100 case GL_ETC1_RGB8_OES:
101 case GL_COMPRESSED_RGB8_ETC2:
102 case GL_COMPRESSED_SRGB8_ETC2:
103 case GL_RGB_S3TC:
104 case GL_RGB4_S3TC:
105 case GL_PALETTE4_RGB8_OES:
106 case GL_PALETTE4_R5_G6_B5_OES:
107 case GL_PALETTE8_RGB8_OES:
108 case GL_PALETTE8_R5_G6_B5_OES:
109 return GL_RGB;
110
111 case GL_COMPRESSED_RGBA:
112 case GL_COMPRESSED_SRGB_ALPHA:
113 case GL_COMPRESSED_RGBA_BPTC_UNORM_ARB:
114 case GL_COMPRESSED_SRGB_ALPHA_BPTC_UNORM_ARB:
115 case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
116 case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
117 case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
118 case GL_COMPRESSED_RGBA_FXT1_3DFX:
119 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
120 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
121 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
122 case GL_COMPRESSED_RGBA8_ETC2_EAC:
123 case GL_COMPRESSED_SRGB8_ALPHA8_ETC2_EAC:
124 case GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2:
125 case GL_COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2:
126 case GL_RGBA_S3TC:
127 case GL_RGBA4_S3TC:
128 case GL_PALETTE4_RGBA8_OES:
129 case GL_PALETTE8_RGB5_A1_OES:
130 case GL_PALETTE4_RGBA4_OES:
131 case GL_PALETTE4_RGB5_A1_OES:
132 case GL_PALETTE8_RGBA8_OES:
133 case GL_PALETTE8_RGBA4_OES:
134 return GL_RGBA;
135
136 case GL_COMPRESSED_ALPHA:
137 return GL_ALPHA;
138
139 case GL_COMPRESSED_LUMINANCE:
140 case GL_COMPRESSED_SLUMINANCE:
141 case GL_COMPRESSED_LUMINANCE_LATC1_EXT:
142 case GL_COMPRESSED_SIGNED_LUMINANCE_LATC1_EXT:
143 return GL_LUMINANCE;
144
145 case GL_COMPRESSED_LUMINANCE_ALPHA:
146 case GL_COMPRESSED_SLUMINANCE_ALPHA:
147 case GL_COMPRESSED_LUMINANCE_ALPHA_LATC2_EXT:
148 case GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT:
149 case GL_COMPRESSED_LUMINANCE_ALPHA_3DC_ATI:
150 return GL_LUMINANCE_ALPHA;
151
152 case GL_COMPRESSED_INTENSITY:
153 return GL_INTENSITY;
154
155 default:
156 return 0;
157 }
158 }
159
160 /**
161 * Return list of (and count of) all specific texture compression
162 * formats that are supported.
163 *
164 * Some formats are \b not returned by this function. The
165 * \c GL_COMPRESSED_TEXTURE_FORMATS query only returns formats that are
166 * "suitable for general-purpose usage." All texture compression extensions
167 * have taken this to mean either linear RGB or linear RGBA.
168 *
169 * The GL_ARB_texture_compress_rgtc spec says:
170 *
171 * "19) Should the GL_NUM_COMPRESSED_TEXTURE_FORMATS and
172 * GL_COMPRESSED_TEXTURE_FORMATS queries return the RGTC formats?
173 *
174 * RESOLVED: No.
175 *
176 * The OpenGL 2.1 specification says "The only values returned
177 * by this query [GL_COMPRESSED_TEXTURE_FORMATS"] are those
178 * corresponding to formats suitable for general-purpose usage.
179 * The renderer will not enumerate formats with restrictions that
180 * need to be specifically understood prior to use."
181 *
182 * Compressed textures with just red or red-green components are
183 * not general-purpose so should not be returned by these queries
184 * because they have restrictions.
185 *
186 * Applications that seek to use the RGTC formats should do so
187 * by looking for this extension's name in the string returned by
188 * glGetString(GL_EXTENSIONS) rather than
189 * what GL_NUM_COMPRESSED_TEXTURE_FORMATS and
190 * GL_COMPRESSED_TEXTURE_FORMATS return."
191 *
192 * There is nearly identical wording in the GL_EXT_texture_compression_rgtc
193 * spec.
194 *
195 * The GL_EXT_texture_rRGB spec says:
196 *
197 * "22) Should the new COMPRESSED_SRGB_* formats be listed in an
198 * implementation's GL_COMPRESSED_TEXTURE_FORMATS list?
199 *
200 * RESOLVED: No. Section 3.8.1 says formats listed by
201 * GL_COMPRESSED_TEXTURE_FORMATS are "suitable for general-purpose
202 * usage." The non-linear distribution of red, green, and
203 * blue for these sRGB compressed formats makes them not really
204 * general-purpose."
205 *
206 * The GL_EXT_texture_compression_latc spec says:
207 *
208 * "16) Should the GL_NUM_COMPRESSED_TEXTURE_FORMATS and
209 * GL_COMPRESSED_TEXTURE_FORMATS queries return the LATC formats?
210 *
211 * RESOLVED: No.
212 *
213 * The OpenGL 2.1 specification says "The only values returned
214 * by this query [GL_COMPRESSED_TEXTURE_FORMATS"] are those
215 * corresponding to formats suitable for general-purpose usage.
216 * The renderer will not enumerate formats with restrictions that
217 * need to be specifically understood prior to use."
218 *
219 * Historically, OpenGL implementation have advertised the RGB and
220 * RGBA versions of the S3TC extensions compressed format tokens
221 * through this mechanism.
222 *
223 * The specification is not sufficiently clear about what "suitable
224 * for general-purpose usage" means. Historically that seems to mean
225 * unsigned RGB or unsigned RGBA. The DXT1 format supporting alpha
226 * (GL_COMPRESSED_RGBA_S3TC_DXT1_EXT) is not exposed in the list (at
227 * least for NVIDIA drivers) because the alpha is always 1.0 expect
228 * when it is 0.0 when RGB is required to be black. NVIDIA's even
229 * limits itself to true linear RGB or RGBA formats, specifically
230 * not including EXT_texture_sRGB's sRGB S3TC compressed formats.
231 *
232 * Adding luminance and luminance-alpha texture formats (and
233 * certainly signed versions of luminance and luminance-alpha
234 * formats!) invites potential comptaibility problems with old
235 * applications using this mechanism since old applications are
236 * unlikely to expect non-RGB or non-RGBA formats to be advertised
237 * through this mechanism. However no specific misinteractions
238 * with old applications is known.
239 *
240 * Applications that seek to use the LATC formats should do so
241 * by looking for this extension's name in the string returned by
242 * glGetString(GL_EXTENSIONS) rather than
243 * what GL_NUM_COMPRESSED_TEXTURE_FORMATS and
244 * GL_COMPRESSED_TEXTURE_FORMATS return."
245 *
246 * There is no formal spec for GL_ATI_texture_compression_3dc. Since the
247 * formats added by this extension are luminance-alpha formats, it is
248 * reasonable to expect them to follow the same rules as
249 * GL_EXT_texture_compression_latc. At the very least, Catalyst 11.6 does not
250 * expose the 3dc formats through this mechanism.
251 *
252 * The spec for GL_ARB_texture_compression_bptc doesn't mention whether it
253 * should be included in GL_COMPRESSED_TEXTURE_FORMATS. However as it takes a
254 * very long time to compress the textures in this format it's probably not
255 * very useful as a general format where the GL will have to compress it on
256 * the fly.
257 *
258 * \param ctx the GL context
259 * \param formats the resulting format list (may be NULL).
260 *
261 * \return number of formats.
262 */
263 GLuint
264 _mesa_get_compressed_formats(struct gl_context *ctx, GLint *formats)
265 {
266 GLint discard_formats[100];
267 GLuint n = 0;
268
269 if (!formats) {
270 formats = discard_formats;
271 }
272
273 if (_mesa_is_desktop_gl(ctx) &&
274 ctx->Extensions.TDFX_texture_compression_FXT1) {
275 formats[n++] = GL_COMPRESSED_RGB_FXT1_3DFX;
276 formats[n++] = GL_COMPRESSED_RGBA_FXT1_3DFX;
277 }
278
279 if (ctx->Extensions.EXT_texture_compression_s3tc) {
280 formats[n++] = GL_COMPRESSED_RGB_S3TC_DXT1_EXT;
281 formats[n++] = GL_COMPRESSED_RGBA_S3TC_DXT3_EXT;
282 formats[n++] = GL_COMPRESSED_RGBA_S3TC_DXT5_EXT;
283
284 /* The ES and desktop GL specs diverge here.
285 *
286 * In desktop OpenGL, the driver can perform online compression of
287 * uncompressed texture data. GL_NUM_COMPRESSED_TEXTURE_FORMATS and
288 * GL_COMPRESSED_TEXTURE_FORMATS give the application a list of
289 * formats that it could ask the driver to compress with some
290 * expectation of quality. The GL_ARB_texture_compression spec
291 * calls this "suitable for general-purpose usage." As noted
292 * above, this means GL_COMPRESSED_RGBA_S3TC_DXT1_EXT is not
293 * included in the list.
294 *
295 * In OpenGL ES, the driver never performs compression.
296 * GL_NUM_COMPRESSED_TEXTURE_FORMATS and
297 * GL_COMPRESSED_TEXTURE_FORMATS give the application a list of
298 * formats that the driver can receive from the application. It
299 * is the *complete* list of formats. The
300 * GL_EXT_texture_compression_s3tc spec says:
301 *
302 * "New State for OpenGL ES 2.0.25 and 3.0.2 Specifications
303 *
304 * The queries for NUM_COMPRESSED_TEXTURE_FORMATS and
305 * COMPRESSED_TEXTURE_FORMATS include
306 * COMPRESSED_RGB_S3TC_DXT1_EXT,
307 * COMPRESSED_RGBA_S3TC_DXT1_EXT,
308 * COMPRESSED_RGBA_S3TC_DXT3_EXT, and
309 * COMPRESSED_RGBA_S3TC_DXT5_EXT."
310 *
311 * Note that the addition is only to the OpenGL ES specification!
312 */
313 if (_mesa_is_gles(ctx)) {
314 formats[n++] = GL_COMPRESSED_RGBA_S3TC_DXT1_EXT;
315 }
316 }
317
318 /* The GL_OES_compressed_ETC1_RGB8_texture spec says:
319 *
320 * "New State
321 *
322 * The queries for NUM_COMPRESSED_TEXTURE_FORMATS and
323 * COMPRESSED_TEXTURE_FORMATS include ETC1_RGB8_OES."
324 */
325 if (_mesa_is_gles(ctx)
326 && ctx->Extensions.OES_compressed_ETC1_RGB8_texture) {
327 formats[n++] = GL_ETC1_RGB8_OES;
328 }
329
330 if (ctx->API == API_OPENGLES) {
331 formats[n++] = GL_PALETTE4_RGB8_OES;
332 formats[n++] = GL_PALETTE4_RGBA8_OES;
333 formats[n++] = GL_PALETTE4_R5_G6_B5_OES;
334 formats[n++] = GL_PALETTE4_RGBA4_OES;
335 formats[n++] = GL_PALETTE4_RGB5_A1_OES;
336 formats[n++] = GL_PALETTE8_RGB8_OES;
337 formats[n++] = GL_PALETTE8_RGBA8_OES;
338 formats[n++] = GL_PALETTE8_R5_G6_B5_OES;
339 formats[n++] = GL_PALETTE8_RGBA4_OES;
340 formats[n++] = GL_PALETTE8_RGB5_A1_OES;
341 }
342
343 if (_mesa_is_gles3(ctx) || ctx->Extensions.ARB_ES3_compatibility) {
344 formats[n++] = GL_COMPRESSED_RGB8_ETC2;
345 formats[n++] = GL_COMPRESSED_RGBA8_ETC2_EAC;
346 formats[n++] = GL_COMPRESSED_R11_EAC;
347 formats[n++] = GL_COMPRESSED_RG11_EAC;
348 formats[n++] = GL_COMPRESSED_SIGNED_R11_EAC;
349 formats[n++] = GL_COMPRESSED_SIGNED_RG11_EAC;
350 formats[n++] = GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2;
351 }
352
353 if (_mesa_is_gles3(ctx)) {
354 formats[n++] = GL_COMPRESSED_SRGB8_ETC2;
355 formats[n++] = GL_COMPRESSED_SRGB8_ALPHA8_ETC2_EAC;
356 formats[n++] = GL_COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2;
357 }
358
359 /* The KHR_texture_compression_astc_hdr spec says:
360 *
361 * "Interactions with OpenGL 4.2
362 *
363 * OpenGL 4.2 supports the feature that compressed textures can be
364 * compressed online, by passing the compressed texture format enum
365 * as the internal format when uploading a texture using TexImage1D,
366 * TexImage2D or TexImage3D (see Section 3.9.3, Texture Image
367 * Specification, subsection Encoding of Special Internal Formats).
368 *
369 * Due to the complexity of the ASTC compression algorithm, it is
370 * not usually suitable for online use, and therefore ASTC support
371 * will be limited to pre-compressed textures only. Where on-device
372 * compression is required, a domain-specific limited compressor
373 * will typically be used, and this is therefore not suitable for
374 * implementation in the driver.
375 *
376 * In particular, the ASTC format specifiers will not be added to
377 * Table 3.14, and thus will not be accepted by the TexImage*D
378 * functions, and will not be returned by the (already deprecated)
379 * COMPRESSED_TEXTURE_FORMATS query."
380 *
381 * The ES and the desktop specs diverge here. In OpenGL ES, the
382 * COMPRESSED_TEXTURE_FORMATS query returns the set of supported specific
383 * compressed formats.
384 */
385 if (ctx->API == API_OPENGLES2 &&
386 ctx->Extensions.KHR_texture_compression_astc_ldr) {
387 formats[n++] = GL_COMPRESSED_RGBA_ASTC_4x4_KHR;
388 formats[n++] = GL_COMPRESSED_RGBA_ASTC_5x4_KHR;
389 formats[n++] = GL_COMPRESSED_RGBA_ASTC_5x5_KHR;
390 formats[n++] = GL_COMPRESSED_RGBA_ASTC_6x5_KHR;
391 formats[n++] = GL_COMPRESSED_RGBA_ASTC_6x6_KHR;
392 formats[n++] = GL_COMPRESSED_RGBA_ASTC_8x5_KHR;
393 formats[n++] = GL_COMPRESSED_RGBA_ASTC_8x6_KHR;
394 formats[n++] = GL_COMPRESSED_RGBA_ASTC_8x8_KHR;
395 formats[n++] = GL_COMPRESSED_RGBA_ASTC_10x5_KHR;
396 formats[n++] = GL_COMPRESSED_RGBA_ASTC_10x6_KHR;
397 formats[n++] = GL_COMPRESSED_RGBA_ASTC_10x8_KHR;
398 formats[n++] = GL_COMPRESSED_RGBA_ASTC_10x10_KHR;
399 formats[n++] = GL_COMPRESSED_RGBA_ASTC_12x10_KHR;
400 formats[n++] = GL_COMPRESSED_RGBA_ASTC_12x12_KHR;
401 formats[n++] = GL_COMPRESSED_SRGB8_ALPHA8_ASTC_4x4_KHR;
402 formats[n++] = GL_COMPRESSED_SRGB8_ALPHA8_ASTC_5x4_KHR;
403 formats[n++] = GL_COMPRESSED_SRGB8_ALPHA8_ASTC_5x5_KHR;
404 formats[n++] = GL_COMPRESSED_SRGB8_ALPHA8_ASTC_6x5_KHR;
405 formats[n++] = GL_COMPRESSED_SRGB8_ALPHA8_ASTC_6x6_KHR;
406 formats[n++] = GL_COMPRESSED_SRGB8_ALPHA8_ASTC_8x5_KHR;
407 formats[n++] = GL_COMPRESSED_SRGB8_ALPHA8_ASTC_8x6_KHR;
408 formats[n++] = GL_COMPRESSED_SRGB8_ALPHA8_ASTC_8x8_KHR;
409 formats[n++] = GL_COMPRESSED_SRGB8_ALPHA8_ASTC_10x5_KHR;
410 formats[n++] = GL_COMPRESSED_SRGB8_ALPHA8_ASTC_10x6_KHR;
411 formats[n++] = GL_COMPRESSED_SRGB8_ALPHA8_ASTC_10x8_KHR;
412 formats[n++] = GL_COMPRESSED_SRGB8_ALPHA8_ASTC_10x10_KHR;
413 formats[n++] = GL_COMPRESSED_SRGB8_ALPHA8_ASTC_12x10_KHR;
414 formats[n++] = GL_COMPRESSED_SRGB8_ALPHA8_ASTC_12x12_KHR;
415 }
416
417 if (_mesa_is_gles3(ctx) &&
418 ctx->Extensions.OES_texture_compression_astc) {
419 formats[n++] = GL_COMPRESSED_RGBA_ASTC_3x3x3_OES;
420 formats[n++] = GL_COMPRESSED_RGBA_ASTC_4x3x3_OES;
421 formats[n++] = GL_COMPRESSED_RGBA_ASTC_4x4x3_OES;
422 formats[n++] = GL_COMPRESSED_RGBA_ASTC_4x4x4_OES;
423 formats[n++] = GL_COMPRESSED_RGBA_ASTC_5x4x4_OES;
424 formats[n++] = GL_COMPRESSED_RGBA_ASTC_5x5x4_OES;
425 formats[n++] = GL_COMPRESSED_RGBA_ASTC_5x5x5_OES;
426 formats[n++] = GL_COMPRESSED_RGBA_ASTC_6x5x5_OES;
427 formats[n++] = GL_COMPRESSED_RGBA_ASTC_6x6x5_OES;
428 formats[n++] = GL_COMPRESSED_RGBA_ASTC_6x6x6_OES;
429 formats[n++] = GL_COMPRESSED_SRGB8_ALPHA8_ASTC_3x3x3_OES;
430 formats[n++] = GL_COMPRESSED_SRGB8_ALPHA8_ASTC_4x3x3_OES;
431 formats[n++] = GL_COMPRESSED_SRGB8_ALPHA8_ASTC_4x4x3_OES;
432 formats[n++] = GL_COMPRESSED_SRGB8_ALPHA8_ASTC_4x4x4_OES;
433 formats[n++] = GL_COMPRESSED_SRGB8_ALPHA8_ASTC_5x4x4_OES;
434 formats[n++] = GL_COMPRESSED_SRGB8_ALPHA8_ASTC_5x5x4_OES;
435 formats[n++] = GL_COMPRESSED_SRGB8_ALPHA8_ASTC_5x5x5_OES;
436 formats[n++] = GL_COMPRESSED_SRGB8_ALPHA8_ASTC_6x5x5_OES;
437 formats[n++] = GL_COMPRESSED_SRGB8_ALPHA8_ASTC_6x6x5_OES;
438 formats[n++] = GL_COMPRESSED_SRGB8_ALPHA8_ASTC_6x6x6_OES;
439 }
440
441 assert(n <= ARRAY_SIZE(discard_formats));
442
443 return n;
444 }
445
446
447 /**
448 * Convert GLenum to a compressed MESA_FORMAT_x.
449 */
450 mesa_format
451 _mesa_glenum_to_compressed_format(GLenum format)
452 {
453 switch (format) {
454 case GL_COMPRESSED_RGB_FXT1_3DFX:
455 return MESA_FORMAT_RGB_FXT1;
456 case GL_COMPRESSED_RGBA_FXT1_3DFX:
457 return MESA_FORMAT_RGBA_FXT1;
458
459 case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
460 case GL_RGB_S3TC:
461 case GL_RGB4_S3TC:
462 return MESA_FORMAT_RGB_DXT1;
463 case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
464 return MESA_FORMAT_RGBA_DXT1;
465 case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
466 case GL_RGBA_S3TC:
467 case GL_RGBA4_S3TC:
468 return MESA_FORMAT_RGBA_DXT3;
469 case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
470 return MESA_FORMAT_RGBA_DXT5;
471
472 case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
473 return MESA_FORMAT_SRGB_DXT1;
474 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
475 return MESA_FORMAT_SRGBA_DXT1;
476 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
477 return MESA_FORMAT_SRGBA_DXT3;
478 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
479 return MESA_FORMAT_SRGBA_DXT5;
480
481 case GL_COMPRESSED_RED_RGTC1:
482 return MESA_FORMAT_R_RGTC1_UNORM;
483 case GL_COMPRESSED_SIGNED_RED_RGTC1:
484 return MESA_FORMAT_R_RGTC1_SNORM;
485 case GL_COMPRESSED_RG_RGTC2:
486 return MESA_FORMAT_RG_RGTC2_UNORM;
487 case GL_COMPRESSED_SIGNED_RG_RGTC2:
488 return MESA_FORMAT_RG_RGTC2_SNORM;
489
490 case GL_COMPRESSED_LUMINANCE_LATC1_EXT:
491 return MESA_FORMAT_L_LATC1_UNORM;
492 case GL_COMPRESSED_SIGNED_LUMINANCE_LATC1_EXT:
493 return MESA_FORMAT_L_LATC1_SNORM;
494 case GL_COMPRESSED_LUMINANCE_ALPHA_LATC2_EXT:
495 case GL_COMPRESSED_LUMINANCE_ALPHA_3DC_ATI:
496 return MESA_FORMAT_LA_LATC2_UNORM;
497 case GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT:
498 return MESA_FORMAT_LA_LATC2_SNORM;
499
500 case GL_ETC1_RGB8_OES:
501 return MESA_FORMAT_ETC1_RGB8;
502 case GL_COMPRESSED_RGB8_ETC2:
503 return MESA_FORMAT_ETC2_RGB8;
504 case GL_COMPRESSED_SRGB8_ETC2:
505 return MESA_FORMAT_ETC2_SRGB8;
506 case GL_COMPRESSED_RGBA8_ETC2_EAC:
507 return MESA_FORMAT_ETC2_RGBA8_EAC;
508 case GL_COMPRESSED_SRGB8_ALPHA8_ETC2_EAC:
509 return MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC;
510 case GL_COMPRESSED_R11_EAC:
511 return MESA_FORMAT_ETC2_R11_EAC;
512 case GL_COMPRESSED_RG11_EAC:
513 return MESA_FORMAT_ETC2_RG11_EAC;
514 case GL_COMPRESSED_SIGNED_R11_EAC:
515 return MESA_FORMAT_ETC2_SIGNED_R11_EAC;
516 case GL_COMPRESSED_SIGNED_RG11_EAC:
517 return MESA_FORMAT_ETC2_SIGNED_RG11_EAC;
518 case GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2:
519 return MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1;
520 case GL_COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2:
521 return MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1;
522
523 case GL_COMPRESSED_RGBA_BPTC_UNORM:
524 return MESA_FORMAT_BPTC_RGBA_UNORM;
525 case GL_COMPRESSED_SRGB_ALPHA_BPTC_UNORM:
526 return MESA_FORMAT_BPTC_SRGB_ALPHA_UNORM;
527 case GL_COMPRESSED_RGB_BPTC_SIGNED_FLOAT:
528 return MESA_FORMAT_BPTC_RGB_SIGNED_FLOAT;
529 case GL_COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT:
530 return MESA_FORMAT_BPTC_RGB_UNSIGNED_FLOAT;
531
532 case GL_COMPRESSED_RGBA_ASTC_4x4_KHR:
533 return MESA_FORMAT_RGBA_ASTC_4x4;
534 case GL_COMPRESSED_RGBA_ASTC_5x4_KHR:
535 return MESA_FORMAT_RGBA_ASTC_5x4;
536 case GL_COMPRESSED_RGBA_ASTC_5x5_KHR:
537 return MESA_FORMAT_RGBA_ASTC_5x5;
538 case GL_COMPRESSED_RGBA_ASTC_6x5_KHR:
539 return MESA_FORMAT_RGBA_ASTC_6x5;
540 case GL_COMPRESSED_RGBA_ASTC_6x6_KHR:
541 return MESA_FORMAT_RGBA_ASTC_6x6;
542 case GL_COMPRESSED_RGBA_ASTC_8x5_KHR:
543 return MESA_FORMAT_RGBA_ASTC_8x5;
544 case GL_COMPRESSED_RGBA_ASTC_8x6_KHR:
545 return MESA_FORMAT_RGBA_ASTC_8x6;
546 case GL_COMPRESSED_RGBA_ASTC_8x8_KHR:
547 return MESA_FORMAT_RGBA_ASTC_8x8;
548 case GL_COMPRESSED_RGBA_ASTC_10x5_KHR:
549 return MESA_FORMAT_RGBA_ASTC_10x5;
550 case GL_COMPRESSED_RGBA_ASTC_10x6_KHR:
551 return MESA_FORMAT_RGBA_ASTC_10x6;
552 case GL_COMPRESSED_RGBA_ASTC_10x8_KHR:
553 return MESA_FORMAT_RGBA_ASTC_10x8;
554 case GL_COMPRESSED_RGBA_ASTC_10x10_KHR:
555 return MESA_FORMAT_RGBA_ASTC_10x10;
556 case GL_COMPRESSED_RGBA_ASTC_12x10_KHR:
557 return MESA_FORMAT_RGBA_ASTC_12x10;
558 case GL_COMPRESSED_RGBA_ASTC_12x12_KHR:
559 return MESA_FORMAT_RGBA_ASTC_12x12;
560 case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_4x4_KHR:
561 return MESA_FORMAT_SRGB8_ALPHA8_ASTC_4x4;
562 case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_5x4_KHR:
563 return MESA_FORMAT_SRGB8_ALPHA8_ASTC_5x4;
564 case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_5x5_KHR:
565 return MESA_FORMAT_SRGB8_ALPHA8_ASTC_5x5;
566 case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_6x5_KHR:
567 return MESA_FORMAT_SRGB8_ALPHA8_ASTC_6x5;
568 case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_6x6_KHR:
569 return MESA_FORMAT_SRGB8_ALPHA8_ASTC_6x6;
570 case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_8x5_KHR:
571 return MESA_FORMAT_SRGB8_ALPHA8_ASTC_8x5;
572 case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_8x6_KHR:
573 return MESA_FORMAT_SRGB8_ALPHA8_ASTC_8x6;
574 case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_8x8_KHR:
575 return MESA_FORMAT_SRGB8_ALPHA8_ASTC_8x8;
576 case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_10x5_KHR:
577 return MESA_FORMAT_SRGB8_ALPHA8_ASTC_10x5;
578 case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_10x6_KHR:
579 return MESA_FORMAT_SRGB8_ALPHA8_ASTC_10x6;
580 case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_10x8_KHR:
581 return MESA_FORMAT_SRGB8_ALPHA8_ASTC_10x8;
582 case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_10x10_KHR:
583 return MESA_FORMAT_SRGB8_ALPHA8_ASTC_10x10;
584 case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_12x10_KHR:
585 return MESA_FORMAT_SRGB8_ALPHA8_ASTC_12x10;
586 case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_12x12_KHR:
587 return MESA_FORMAT_SRGB8_ALPHA8_ASTC_12x12;
588 case GL_COMPRESSED_RGBA_ASTC_3x3x3_OES:
589 return MESA_FORMAT_RGBA_ASTC_3x3x3;
590 case GL_COMPRESSED_RGBA_ASTC_4x3x3_OES:
591 return MESA_FORMAT_RGBA_ASTC_4x3x3;
592 case GL_COMPRESSED_RGBA_ASTC_4x4x3_OES:
593 return MESA_FORMAT_RGBA_ASTC_4x4x3;
594 case GL_COMPRESSED_RGBA_ASTC_4x4x4_OES:
595 return MESA_FORMAT_RGBA_ASTC_4x4x4;
596 case GL_COMPRESSED_RGBA_ASTC_5x4x4_OES:
597 return MESA_FORMAT_RGBA_ASTC_5x4x4;
598 case GL_COMPRESSED_RGBA_ASTC_5x5x4_OES:
599 return MESA_FORMAT_RGBA_ASTC_5x5x4;
600 case GL_COMPRESSED_RGBA_ASTC_5x5x5_OES:
601 return MESA_FORMAT_RGBA_ASTC_5x5x5;
602 case GL_COMPRESSED_RGBA_ASTC_6x5x5_OES:
603 return MESA_FORMAT_RGBA_ASTC_6x5x5;
604 case GL_COMPRESSED_RGBA_ASTC_6x6x5_OES:
605 return MESA_FORMAT_RGBA_ASTC_6x6x5;
606 case GL_COMPRESSED_RGBA_ASTC_6x6x6_OES:
607 return MESA_FORMAT_RGBA_ASTC_6x6x6;
608 case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_3x3x3_OES:
609 return MESA_FORMAT_SRGB8_ALPHA8_ASTC_3x3x3;
610 case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_4x3x3_OES:
611 return MESA_FORMAT_SRGB8_ALPHA8_ASTC_4x3x3;
612 case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_4x4x3_OES:
613 return MESA_FORMAT_SRGB8_ALPHA8_ASTC_4x4x3;
614 case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_4x4x4_OES:
615 return MESA_FORMAT_SRGB8_ALPHA8_ASTC_4x4x4;
616 case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_5x4x4_OES:
617 return MESA_FORMAT_SRGB8_ALPHA8_ASTC_5x4x4;
618 case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_5x5x4_OES:
619 return MESA_FORMAT_SRGB8_ALPHA8_ASTC_5x5x4;
620 case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_5x5x5_OES:
621 return MESA_FORMAT_SRGB8_ALPHA8_ASTC_5x5x5;
622 case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_6x5x5_OES:
623 return MESA_FORMAT_SRGB8_ALPHA8_ASTC_6x5x5;
624 case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_6x6x5_OES:
625 return MESA_FORMAT_SRGB8_ALPHA8_ASTC_6x6x5;
626 case GL_COMPRESSED_SRGB8_ALPHA8_ASTC_6x6x6_OES:
627 return MESA_FORMAT_SRGB8_ALPHA8_ASTC_6x6x6;
628
629 default:
630 return MESA_FORMAT_NONE;
631 }
632 }
633
634
635 /**
636 * Given a compressed MESA_FORMAT_x value, return the corresponding
637 * GLenum for that format.
638 * This is needed for glGetTexLevelParameter(GL_TEXTURE_INTERNAL_FORMAT)
639 * which must return the specific texture format used when the user might
640 * have originally specified a generic compressed format in their
641 * glTexImage2D() call.
642 * For non-compressed textures, we always return the user-specified
643 * internal format unchanged.
644 */
645 GLenum
646 _mesa_compressed_format_to_glenum(struct gl_context *ctx,
647 mesa_format mesaFormat)
648 {
649 switch (mesaFormat) {
650 case MESA_FORMAT_RGB_FXT1:
651 return GL_COMPRESSED_RGB_FXT1_3DFX;
652 case MESA_FORMAT_RGBA_FXT1:
653 return GL_COMPRESSED_RGBA_FXT1_3DFX;
654 case MESA_FORMAT_RGB_DXT1:
655 return GL_COMPRESSED_RGB_S3TC_DXT1_EXT;
656 case MESA_FORMAT_RGBA_DXT1:
657 return GL_COMPRESSED_RGBA_S3TC_DXT1_EXT;
658 case MESA_FORMAT_RGBA_DXT3:
659 return GL_COMPRESSED_RGBA_S3TC_DXT3_EXT;
660 case MESA_FORMAT_RGBA_DXT5:
661 return GL_COMPRESSED_RGBA_S3TC_DXT5_EXT;
662 case MESA_FORMAT_SRGB_DXT1:
663 return GL_COMPRESSED_SRGB_S3TC_DXT1_EXT;
664 case MESA_FORMAT_SRGBA_DXT1:
665 return GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT;
666 case MESA_FORMAT_SRGBA_DXT3:
667 return GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT;
668 case MESA_FORMAT_SRGBA_DXT5:
669 return GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT;
670 case MESA_FORMAT_R_RGTC1_UNORM:
671 return GL_COMPRESSED_RED_RGTC1;
672 case MESA_FORMAT_R_RGTC1_SNORM:
673 return GL_COMPRESSED_SIGNED_RED_RGTC1;
674 case MESA_FORMAT_RG_RGTC2_UNORM:
675 return GL_COMPRESSED_RG_RGTC2;
676 case MESA_FORMAT_RG_RGTC2_SNORM:
677 return GL_COMPRESSED_SIGNED_RG_RGTC2;
678
679 case MESA_FORMAT_L_LATC1_UNORM:
680 return GL_COMPRESSED_LUMINANCE_LATC1_EXT;
681 case MESA_FORMAT_L_LATC1_SNORM:
682 return GL_COMPRESSED_SIGNED_LUMINANCE_LATC1_EXT;
683 case MESA_FORMAT_LA_LATC2_UNORM:
684 return GL_COMPRESSED_LUMINANCE_ALPHA_LATC2_EXT;
685 case MESA_FORMAT_LA_LATC2_SNORM:
686 return GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT;
687
688 case MESA_FORMAT_ETC1_RGB8:
689 return GL_ETC1_RGB8_OES;
690 case MESA_FORMAT_ETC2_RGB8:
691 return GL_COMPRESSED_RGB8_ETC2;
692 case MESA_FORMAT_ETC2_SRGB8:
693 return GL_COMPRESSED_SRGB8_ETC2;
694 case MESA_FORMAT_ETC2_RGBA8_EAC:
695 return GL_COMPRESSED_RGBA8_ETC2_EAC;
696 case MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC:
697 return GL_COMPRESSED_SRGB8_ALPHA8_ETC2_EAC;
698 case MESA_FORMAT_ETC2_R11_EAC:
699 return GL_COMPRESSED_R11_EAC;
700 case MESA_FORMAT_ETC2_RG11_EAC:
701 return GL_COMPRESSED_RG11_EAC;
702 case MESA_FORMAT_ETC2_SIGNED_R11_EAC:
703 return GL_COMPRESSED_SIGNED_R11_EAC;
704 case MESA_FORMAT_ETC2_SIGNED_RG11_EAC:
705 return GL_COMPRESSED_SIGNED_RG11_EAC;
706 case MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1:
707 return GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2;
708 case MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1:
709 return GL_COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2;
710
711 case MESA_FORMAT_BPTC_RGBA_UNORM:
712 return GL_COMPRESSED_RGBA_BPTC_UNORM;
713 case MESA_FORMAT_BPTC_SRGB_ALPHA_UNORM:
714 return GL_COMPRESSED_SRGB_ALPHA_BPTC_UNORM;
715 case MESA_FORMAT_BPTC_RGB_SIGNED_FLOAT:
716 return GL_COMPRESSED_RGB_BPTC_SIGNED_FLOAT;
717 case MESA_FORMAT_BPTC_RGB_UNSIGNED_FLOAT:
718 return GL_COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT;
719
720 case MESA_FORMAT_RGBA_ASTC_4x4:
721 return GL_COMPRESSED_RGBA_ASTC_4x4_KHR;
722 case MESA_FORMAT_RGBA_ASTC_5x4:
723 return GL_COMPRESSED_RGBA_ASTC_5x4_KHR;
724 case MESA_FORMAT_RGBA_ASTC_5x5:
725 return GL_COMPRESSED_RGBA_ASTC_5x5_KHR;
726 case MESA_FORMAT_RGBA_ASTC_6x5:
727 return GL_COMPRESSED_RGBA_ASTC_6x5_KHR;
728 case MESA_FORMAT_RGBA_ASTC_6x6:
729 return GL_COMPRESSED_RGBA_ASTC_6x6_KHR;
730 case MESA_FORMAT_RGBA_ASTC_8x5:
731 return GL_COMPRESSED_RGBA_ASTC_8x5_KHR;
732 case MESA_FORMAT_RGBA_ASTC_8x6:
733 return GL_COMPRESSED_RGBA_ASTC_8x6_KHR;
734 case MESA_FORMAT_RGBA_ASTC_8x8:
735 return GL_COMPRESSED_RGBA_ASTC_8x8_KHR;
736 case MESA_FORMAT_RGBA_ASTC_10x5:
737 return GL_COMPRESSED_RGBA_ASTC_10x5_KHR;
738 case MESA_FORMAT_RGBA_ASTC_10x6:
739 return GL_COMPRESSED_RGBA_ASTC_10x6_KHR;
740 case MESA_FORMAT_RGBA_ASTC_10x8:
741 return GL_COMPRESSED_RGBA_ASTC_10x8_KHR;
742 case MESA_FORMAT_RGBA_ASTC_10x10:
743 return GL_COMPRESSED_RGBA_ASTC_10x10_KHR;
744 case MESA_FORMAT_RGBA_ASTC_12x10:
745 return GL_COMPRESSED_RGBA_ASTC_12x10_KHR;
746 case MESA_FORMAT_RGBA_ASTC_12x12:
747 return GL_COMPRESSED_RGBA_ASTC_12x12_KHR;
748 case MESA_FORMAT_SRGB8_ALPHA8_ASTC_4x4:
749 return GL_COMPRESSED_SRGB8_ALPHA8_ASTC_4x4_KHR;
750 case MESA_FORMAT_SRGB8_ALPHA8_ASTC_5x4:
751 return GL_COMPRESSED_SRGB8_ALPHA8_ASTC_5x4_KHR;
752 case MESA_FORMAT_SRGB8_ALPHA8_ASTC_5x5:
753 return GL_COMPRESSED_SRGB8_ALPHA8_ASTC_5x5_KHR;
754 case MESA_FORMAT_SRGB8_ALPHA8_ASTC_6x5:
755 return GL_COMPRESSED_SRGB8_ALPHA8_ASTC_6x5_KHR;
756 case MESA_FORMAT_SRGB8_ALPHA8_ASTC_6x6:
757 return GL_COMPRESSED_SRGB8_ALPHA8_ASTC_6x6_KHR;
758 case MESA_FORMAT_SRGB8_ALPHA8_ASTC_8x5:
759 return GL_COMPRESSED_SRGB8_ALPHA8_ASTC_8x5_KHR;
760 case MESA_FORMAT_SRGB8_ALPHA8_ASTC_8x6:
761 return GL_COMPRESSED_SRGB8_ALPHA8_ASTC_8x6_KHR;
762 case MESA_FORMAT_SRGB8_ALPHA8_ASTC_8x8:
763 return GL_COMPRESSED_SRGB8_ALPHA8_ASTC_8x8_KHR;
764 case MESA_FORMAT_SRGB8_ALPHA8_ASTC_10x5:
765 return GL_COMPRESSED_SRGB8_ALPHA8_ASTC_10x5_KHR;
766 case MESA_FORMAT_SRGB8_ALPHA8_ASTC_10x6:
767 return GL_COMPRESSED_SRGB8_ALPHA8_ASTC_10x6_KHR;
768 case MESA_FORMAT_SRGB8_ALPHA8_ASTC_10x8:
769 return GL_COMPRESSED_SRGB8_ALPHA8_ASTC_10x8_KHR;
770 case MESA_FORMAT_SRGB8_ALPHA8_ASTC_10x10:
771 return GL_COMPRESSED_SRGB8_ALPHA8_ASTC_10x10_KHR;
772 case MESA_FORMAT_SRGB8_ALPHA8_ASTC_12x10:
773 return GL_COMPRESSED_SRGB8_ALPHA8_ASTC_12x10_KHR;
774 case MESA_FORMAT_SRGB8_ALPHA8_ASTC_12x12:
775 return GL_COMPRESSED_SRGB8_ALPHA8_ASTC_12x12_KHR;
776
777 case MESA_FORMAT_RGBA_ASTC_3x3x3:
778 return GL_COMPRESSED_RGBA_ASTC_3x3x3_OES;
779 case MESA_FORMAT_RGBA_ASTC_4x3x3:
780 return GL_COMPRESSED_RGBA_ASTC_4x3x3_OES;
781 case MESA_FORMAT_RGBA_ASTC_4x4x3:
782 return GL_COMPRESSED_RGBA_ASTC_4x4x3_OES;
783 case MESA_FORMAT_RGBA_ASTC_4x4x4:
784 return GL_COMPRESSED_RGBA_ASTC_4x4x4_OES;
785 case MESA_FORMAT_RGBA_ASTC_5x4x4:
786 return GL_COMPRESSED_RGBA_ASTC_5x4x4_OES;
787 case MESA_FORMAT_RGBA_ASTC_5x5x4:
788 return GL_COMPRESSED_RGBA_ASTC_5x5x4_OES;
789 case MESA_FORMAT_RGBA_ASTC_5x5x5:
790 return GL_COMPRESSED_RGBA_ASTC_5x5x5_OES;
791 case MESA_FORMAT_RGBA_ASTC_6x5x5:
792 return GL_COMPRESSED_RGBA_ASTC_6x5x5_OES;
793 case MESA_FORMAT_RGBA_ASTC_6x6x5:
794 return GL_COMPRESSED_RGBA_ASTC_6x6x5_OES;
795 case MESA_FORMAT_RGBA_ASTC_6x6x6:
796 return GL_COMPRESSED_RGBA_ASTC_6x6x6_OES;
797 case MESA_FORMAT_SRGB8_ALPHA8_ASTC_3x3x3:
798 return GL_COMPRESSED_SRGB8_ALPHA8_ASTC_3x3x3_OES;
799 case MESA_FORMAT_SRGB8_ALPHA8_ASTC_4x3x3:
800 return GL_COMPRESSED_SRGB8_ALPHA8_ASTC_4x3x3_OES;
801 case MESA_FORMAT_SRGB8_ALPHA8_ASTC_4x4x3:
802 return GL_COMPRESSED_SRGB8_ALPHA8_ASTC_4x4x3_OES;
803 case MESA_FORMAT_SRGB8_ALPHA8_ASTC_4x4x4:
804 return GL_COMPRESSED_SRGB8_ALPHA8_ASTC_4x4x4_OES;
805 case MESA_FORMAT_SRGB8_ALPHA8_ASTC_5x4x4:
806 return GL_COMPRESSED_SRGB8_ALPHA8_ASTC_5x4x4_OES;
807 case MESA_FORMAT_SRGB8_ALPHA8_ASTC_5x5x4:
808 return GL_COMPRESSED_SRGB8_ALPHA8_ASTC_5x5x4_OES;
809 case MESA_FORMAT_SRGB8_ALPHA8_ASTC_5x5x5:
810 return GL_COMPRESSED_SRGB8_ALPHA8_ASTC_5x5x5_OES;
811 case MESA_FORMAT_SRGB8_ALPHA8_ASTC_6x5x5:
812 return GL_COMPRESSED_SRGB8_ALPHA8_ASTC_6x5x5_OES;
813 case MESA_FORMAT_SRGB8_ALPHA8_ASTC_6x6x5:
814 return GL_COMPRESSED_SRGB8_ALPHA8_ASTC_6x6x5_OES;
815 case MESA_FORMAT_SRGB8_ALPHA8_ASTC_6x6x6:
816 return GL_COMPRESSED_SRGB8_ALPHA8_ASTC_6x6x6_OES;
817 default:
818 _mesa_problem(ctx, "Unexpected mesa texture format in"
819 " _mesa_compressed_format_to_glenum()");
820 return 0;
821 }
822 }
823
824
825 /*
826 * Return the address of the pixel at (col, row, img) in a
827 * compressed texture image.
828 * \param col, row, img - image position (3D), should be a multiple of the
829 * format's block size.
830 * \param format - compressed image format
831 * \param width - image width (stride) in pixels
832 * \param image - the image address
833 * \return address of pixel at (row, col, img)
834 */
835 GLubyte *
836 _mesa_compressed_image_address(GLint col, GLint row, GLint img,
837 mesa_format mesaFormat,
838 GLsizei width, const GLubyte *image)
839 {
840 /* XXX only 2D images implemented, not 3D */
841 const GLuint blockSize = _mesa_get_format_bytes(mesaFormat);
842 GLuint bw, bh;
843 GLint offset;
844
845 _mesa_get_format_block_size(mesaFormat, &bw, &bh);
846
847 assert(col % bw == 0);
848 assert(row % bh == 0);
849
850 offset = ((width + bw - 1) / bw) * (row / bh) + col / bw;
851 offset *= blockSize;
852
853 return (GLubyte *) image + offset;
854 }
855
856
857 /**
858 * Return a texel-fetch function for the given format, or NULL if
859 * invalid format.
860 */
861 compressed_fetch_func
862 _mesa_get_compressed_fetch_func(mesa_format format)
863 {
864 switch (_mesa_get_format_layout(format)) {
865 case MESA_FORMAT_LAYOUT_S3TC:
866 return _mesa_get_dxt_fetch_func(format);
867 case MESA_FORMAT_LAYOUT_FXT1:
868 return _mesa_get_fxt_fetch_func(format);
869 case MESA_FORMAT_LAYOUT_RGTC:
870 case MESA_FORMAT_LAYOUT_LATC:
871 return _mesa_get_compressed_rgtc_func(format);
872 case MESA_FORMAT_LAYOUT_ETC1:
873 return _mesa_get_etc_fetch_func(format);
874 case MESA_FORMAT_LAYOUT_BPTC:
875 return _mesa_get_bptc_fetch_func(format);
876 default:
877 return NULL;
878 }
879 }
880
881
882 /**
883 * Decompress a compressed texture image, returning a GL_RGBA/GL_FLOAT image.
884 * \param srcRowStride stride in bytes between rows of blocks in the
885 * compressed source image.
886 */
887 void
888 _mesa_decompress_image(mesa_format format, GLuint width, GLuint height,
889 const GLubyte *src, GLint srcRowStride,
890 GLfloat *dest)
891 {
892 compressed_fetch_func fetch;
893 GLuint i, j;
894 GLuint bytes, bw, bh;
895 GLint stride;
896
897 bytes = _mesa_get_format_bytes(format);
898 _mesa_get_format_block_size(format, &bw, &bh);
899
900 fetch = _mesa_get_compressed_fetch_func(format);
901 if (!fetch) {
902 _mesa_problem(NULL, "Unexpected format in _mesa_decompress_image()");
903 return;
904 }
905
906 stride = srcRowStride * bh / bytes;
907
908 for (j = 0; j < height; j++) {
909 for (i = 0; i < width; i++) {
910 fetch(src, stride, i, j, dest);
911 dest += 4;
912 }
913 }
914 }