2 * Mesa 3-D graphics library
4 * Copyright (C) 1999-2006 Brian Paul All Rights Reserved.
5 * Copyright (c) 2008 VMware, Inc.
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:
14 * The above copyright notice and this permission notice shall be included
15 * in all copies or substantial portions of the Software.
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.
29 * Helper functions for texture compression.
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"
48 * Get the GL base format of a specified GL compressed texture format
50 * From page 232 of the OpenGL 3.3 (Compatiblity Profile) spec:
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"
72 * The base format of \c format if \c format is a compressed format (either
73 * generic or specific. Otherwise 0 is returned.
76 _mesa_gl_compressed_format_base_format(GLenum 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
:
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
:
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
:
105 case GL_COMPRESSED_RGBA
:
106 case GL_COMPRESSED_SRGB_ALPHA
:
107 case GL_COMPRESSED_RGBA_BPTC_UNORM_ARB
:
108 case GL_COMPRESSED_SRGB_ALPHA_BPTC_UNORM_ARB
:
109 case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT
:
110 case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT
:
111 case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT
:
112 case GL_COMPRESSED_RGBA_FXT1_3DFX
:
113 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT
:
114 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT
:
115 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT
:
116 case GL_COMPRESSED_RGBA8_ETC2_EAC
:
117 case GL_COMPRESSED_SRGB8_ALPHA8_ETC2_EAC
:
118 case GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2
:
119 case GL_COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2
:
122 case GL_COMPRESSED_ALPHA
:
125 case GL_COMPRESSED_LUMINANCE
:
126 case GL_COMPRESSED_SLUMINANCE
:
127 case GL_COMPRESSED_LUMINANCE_LATC1_EXT
:
128 case GL_COMPRESSED_SIGNED_LUMINANCE_LATC1_EXT
:
131 case GL_COMPRESSED_LUMINANCE_ALPHA
:
132 case GL_COMPRESSED_SLUMINANCE_ALPHA
:
133 case GL_COMPRESSED_LUMINANCE_ALPHA_LATC2_EXT
:
134 case GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT
:
135 case GL_COMPRESSED_LUMINANCE_ALPHA_3DC_ATI
:
136 return GL_LUMINANCE_ALPHA
;
138 case GL_COMPRESSED_INTENSITY
:
147 * Return list of (and count of) all specific texture compression
148 * formats that are supported.
150 * Some formats are \b not returned by this function. The
151 * \c GL_COMPRESSED_TEXTURE_FORMATS query only returns formats that are
152 * "suitable for general-purpose usage." All texture compression extensions
153 * have taken this to mean either linear RGB or linear RGBA.
155 * The GL_ARB_texture_compress_rgtc spec says:
157 * "19) Should the GL_NUM_COMPRESSED_TEXTURE_FORMATS and
158 * GL_COMPRESSED_TEXTURE_FORMATS queries return the RGTC formats?
162 * The OpenGL 2.1 specification says "The only values returned
163 * by this query [GL_COMPRESSED_TEXTURE_FORMATS"] are those
164 * corresponding to formats suitable for general-purpose usage.
165 * The renderer will not enumerate formats with restrictions that
166 * need to be specifically understood prior to use."
168 * Compressed textures with just red or red-green components are
169 * not general-purpose so should not be returned by these queries
170 * because they have restrictions.
172 * Applications that seek to use the RGTC formats should do so
173 * by looking for this extension's name in the string returned by
174 * glGetString(GL_EXTENSIONS) rather than
175 * what GL_NUM_COMPRESSED_TEXTURE_FORMATS and
176 * GL_COMPRESSED_TEXTURE_FORMATS return."
178 * There is nearly identical wording in the GL_EXT_texture_compression_rgtc
181 * The GL_EXT_texture_rRGB spec says:
183 * "22) Should the new COMPRESSED_SRGB_* formats be listed in an
184 * implementation's GL_COMPRESSED_TEXTURE_FORMATS list?
186 * RESOLVED: No. Section 3.8.1 says formats listed by
187 * GL_COMPRESSED_TEXTURE_FORMATS are "suitable for general-purpose
188 * usage." The non-linear distribution of red, green, and
189 * blue for these sRGB compressed formats makes them not really
192 * The GL_EXT_texture_compression_latc spec says:
194 * "16) Should the GL_NUM_COMPRESSED_TEXTURE_FORMATS and
195 * GL_COMPRESSED_TEXTURE_FORMATS queries return the LATC formats?
199 * The OpenGL 2.1 specification says "The only values returned
200 * by this query [GL_COMPRESSED_TEXTURE_FORMATS"] are those
201 * corresponding to formats suitable for general-purpose usage.
202 * The renderer will not enumerate formats with restrictions that
203 * need to be specifically understood prior to use."
205 * Historically, OpenGL implementation have advertised the RGB and
206 * RGBA versions of the S3TC extensions compressed format tokens
207 * through this mechanism.
209 * The specification is not sufficiently clear about what "suitable
210 * for general-purpose usage" means. Historically that seems to mean
211 * unsigned RGB or unsigned RGBA. The DXT1 format supporting alpha
212 * (GL_COMPRESSED_RGBA_S3TC_DXT1_EXT) is not exposed in the list (at
213 * least for NVIDIA drivers) because the alpha is always 1.0 expect
214 * when it is 0.0 when RGB is required to be black. NVIDIA's even
215 * limits itself to true linear RGB or RGBA formats, specifically
216 * not including EXT_texture_sRGB's sRGB S3TC compressed formats.
218 * Adding luminance and luminance-alpha texture formats (and
219 * certainly signed versions of luminance and luminance-alpha
220 * formats!) invites potential comptaibility problems with old
221 * applications using this mechanism since old applications are
222 * unlikely to expect non-RGB or non-RGBA formats to be advertised
223 * through this mechanism. However no specific misinteractions
224 * with old applications is known.
226 * Applications that seek to use the LATC formats should do so
227 * by looking for this extension's name in the string returned by
228 * glGetString(GL_EXTENSIONS) rather than
229 * what GL_NUM_COMPRESSED_TEXTURE_FORMATS and
230 * GL_COMPRESSED_TEXTURE_FORMATS return."
232 * There is no formal spec for GL_ATI_texture_compression_3dc. Since the
233 * formats added by this extension are luminance-alpha formats, it is
234 * reasonable to expect them to follow the same rules as
235 * GL_EXT_texture_compression_latc. At the very least, Catalyst 11.6 does not
236 * expose the 3dc formats through this mechanism.
238 * The spec for GL_ARB_texture_compression_bptc doesn't mention whether it
239 * should be included in GL_COMPRESSED_TEXTURE_FORMATS. However as it takes a
240 * very long time to compress the textures in this format it's probably not
241 * very useful as a general format where the GL will have to compress it on
244 * \param ctx the GL context
245 * \param formats the resulting format list (may be NULL).
247 * \return number of formats.
250 _mesa_get_compressed_formats(struct gl_context
*ctx
, GLint
*formats
)
253 if (ctx
->Extensions
.TDFX_texture_compression_FXT1
) {
255 formats
[n
++] = GL_COMPRESSED_RGB_FXT1_3DFX
;
256 formats
[n
++] = GL_COMPRESSED_RGBA_FXT1_3DFX
;
263 if (ctx
->Extensions
.EXT_texture_compression_s3tc
) {
265 formats
[n
++] = GL_COMPRESSED_RGB_S3TC_DXT1_EXT
;
266 formats
[n
++] = GL_COMPRESSED_RGBA_S3TC_DXT3_EXT
;
267 formats
[n
++] = GL_COMPRESSED_RGBA_S3TC_DXT5_EXT
;
273 /* The ES and desktop GL specs diverge here.
275 * In desktop OpenGL, the driver can perform online compression of
276 * uncompressed texture data. GL_NUM_COMPRESSED_TEXTURE_FORMATS and
277 * GL_COMPRESSED_TEXTURE_FORMATS give the application a list of
278 * formats that it could ask the driver to compress with some
279 * expectation of quality. The GL_ARB_texture_compression spec
280 * calls this "suitable for general-purpose usage." As noted
281 * above, this means GL_COMPRESSED_RGBA_S3TC_DXT1_EXT is not
282 * included in the list.
284 * In OpenGL ES, the driver never performs compression.
285 * GL_NUM_COMPRESSED_TEXTURE_FORMATS and
286 * GL_COMPRESSED_TEXTURE_FORMATS give the application a list of
287 * formats that the driver can receive from the application. It
288 * is the *complete* list of formats. The
289 * GL_EXT_texture_compression_s3tc spec says:
291 * "New State for OpenGL ES 2.0.25 and 3.0.2 Specifications
293 * The queries for NUM_COMPRESSED_TEXTURE_FORMATS and
294 * COMPRESSED_TEXTURE_FORMATS include
295 * COMPRESSED_RGB_S3TC_DXT1_EXT,
296 * COMPRESSED_RGBA_S3TC_DXT1_EXT,
297 * COMPRESSED_RGBA_S3TC_DXT3_EXT, and
298 * COMPRESSED_RGBA_S3TC_DXT5_EXT."
300 * Note that the addition is only to the OpenGL ES specification!
302 if (_mesa_is_gles(ctx
)) {
304 formats
[n
++] = GL_COMPRESSED_RGBA_S3TC_DXT1_EXT
;
311 /* The GL_OES_compressed_ETC1_RGB8_texture spec says:
315 * The queries for NUM_COMPRESSED_TEXTURE_FORMATS and
316 * COMPRESSED_TEXTURE_FORMATS include ETC1_RGB8_OES."
318 if (_mesa_is_gles(ctx
)
319 && ctx
->Extensions
.OES_compressed_ETC1_RGB8_texture
) {
321 formats
[n
++] = GL_ETC1_RGB8_OES
;
328 if (ctx
->API
== API_OPENGLES
) {
330 formats
[n
++] = GL_PALETTE4_RGB8_OES
;
331 formats
[n
++] = GL_PALETTE4_RGBA8_OES
;
332 formats
[n
++] = GL_PALETTE4_R5_G6_B5_OES
;
333 formats
[n
++] = GL_PALETTE4_RGBA4_OES
;
334 formats
[n
++] = GL_PALETTE4_RGB5_A1_OES
;
335 formats
[n
++] = GL_PALETTE8_RGB8_OES
;
336 formats
[n
++] = GL_PALETTE8_RGBA8_OES
;
337 formats
[n
++] = GL_PALETTE8_R5_G6_B5_OES
;
338 formats
[n
++] = GL_PALETTE8_RGBA4_OES
;
339 formats
[n
++] = GL_PALETTE8_RGB5_A1_OES
;
346 if (_mesa_is_gles3(ctx
)) {
348 formats
[n
++] = GL_COMPRESSED_RGB8_ETC2
;
349 formats
[n
++] = GL_COMPRESSED_SRGB8_ETC2
;
350 formats
[n
++] = GL_COMPRESSED_RGBA8_ETC2_EAC
;
351 formats
[n
++] = GL_COMPRESSED_SRGB8_ALPHA8_ETC2_EAC
;
352 formats
[n
++] = GL_COMPRESSED_R11_EAC
;
353 formats
[n
++] = GL_COMPRESSED_RG11_EAC
;
354 formats
[n
++] = GL_COMPRESSED_SIGNED_R11_EAC
;
355 formats
[n
++] = GL_COMPRESSED_SIGNED_RG11_EAC
;
356 formats
[n
++] = GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2
;
357 formats
[n
++] = GL_COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2
;
368 * Convert a compressed MESA_FORMAT_x to a GLenum.
371 _mesa_glenum_to_compressed_format(GLenum format
)
374 case GL_COMPRESSED_RGB_FXT1_3DFX
:
375 return MESA_FORMAT_RGB_FXT1
;
376 case GL_COMPRESSED_RGBA_FXT1_3DFX
:
377 return MESA_FORMAT_RGBA_FXT1
;
379 case GL_COMPRESSED_RGB_S3TC_DXT1_EXT
:
381 return MESA_FORMAT_RGB_DXT1
;
382 case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT
:
384 return MESA_FORMAT_RGBA_DXT1
;
385 case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT
:
387 return MESA_FORMAT_RGBA_DXT3
;
388 case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT
:
390 return MESA_FORMAT_RGBA_DXT5
;
392 case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT
:
393 return MESA_FORMAT_SRGB_DXT1
;
394 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT
:
395 return MESA_FORMAT_SRGBA_DXT1
;
396 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT
:
397 return MESA_FORMAT_SRGBA_DXT3
;
398 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT
:
399 return MESA_FORMAT_SRGBA_DXT5
;
401 case GL_COMPRESSED_RED_RGTC1
:
402 return MESA_FORMAT_R_RGTC1_UNORM
;
403 case GL_COMPRESSED_SIGNED_RED_RGTC1
:
404 return MESA_FORMAT_R_RGTC1_SNORM
;
405 case GL_COMPRESSED_RG_RGTC2
:
406 return MESA_FORMAT_RG_RGTC2_UNORM
;
407 case GL_COMPRESSED_SIGNED_RG_RGTC2
:
408 return MESA_FORMAT_RG_RGTC2_SNORM
;
410 case GL_COMPRESSED_LUMINANCE_LATC1_EXT
:
411 return MESA_FORMAT_L_LATC1_UNORM
;
412 case GL_COMPRESSED_SIGNED_LUMINANCE_LATC1_EXT
:
413 return MESA_FORMAT_L_LATC1_SNORM
;
414 case GL_COMPRESSED_LUMINANCE_ALPHA_LATC2_EXT
:
415 case GL_COMPRESSED_LUMINANCE_ALPHA_3DC_ATI
:
416 return MESA_FORMAT_LA_LATC2_UNORM
;
417 case GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT
:
418 return MESA_FORMAT_LA_LATC2_SNORM
;
420 case GL_ETC1_RGB8_OES
:
421 return MESA_FORMAT_ETC1_RGB8
;
422 case GL_COMPRESSED_RGB8_ETC2
:
423 return MESA_FORMAT_ETC2_RGB8
;
424 case GL_COMPRESSED_SRGB8_ETC2
:
425 return MESA_FORMAT_ETC2_SRGB8
;
426 case GL_COMPRESSED_RGBA8_ETC2_EAC
:
427 return MESA_FORMAT_ETC2_RGBA8_EAC
;
428 case GL_COMPRESSED_SRGB8_ALPHA8_ETC2_EAC
:
429 return MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC
;
430 case GL_COMPRESSED_R11_EAC
:
431 return MESA_FORMAT_ETC2_R11_EAC
;
432 case GL_COMPRESSED_RG11_EAC
:
433 return MESA_FORMAT_ETC2_RG11_EAC
;
434 case GL_COMPRESSED_SIGNED_R11_EAC
:
435 return MESA_FORMAT_ETC2_SIGNED_R11_EAC
;
436 case GL_COMPRESSED_SIGNED_RG11_EAC
:
437 return MESA_FORMAT_ETC2_SIGNED_RG11_EAC
;
438 case GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2
:
439 return MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1
;
440 case GL_COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2
:
441 return MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1
;
443 case GL_COMPRESSED_RGBA_BPTC_UNORM
:
444 return MESA_FORMAT_BPTC_RGBA_UNORM
;
445 case GL_COMPRESSED_SRGB_ALPHA_BPTC_UNORM
:
446 return MESA_FORMAT_BPTC_SRGB_ALPHA_UNORM
;
447 case GL_COMPRESSED_RGB_BPTC_SIGNED_FLOAT
:
448 return MESA_FORMAT_BPTC_RGB_SIGNED_FLOAT
;
449 case GL_COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT
:
450 return MESA_FORMAT_BPTC_RGB_UNSIGNED_FLOAT
;
453 return MESA_FORMAT_NONE
;
459 * Given a compressed MESA_FORMAT_x value, return the corresponding
460 * GLenum for that format.
461 * This is needed for glGetTexLevelParameter(GL_TEXTURE_INTERNAL_FORMAT)
462 * which must return the specific texture format used when the user might
463 * have originally specified a generic compressed format in their
464 * glTexImage2D() call.
465 * For non-compressed textures, we always return the user-specified
466 * internal format unchanged.
469 _mesa_compressed_format_to_glenum(struct gl_context
*ctx
, mesa_format mesaFormat
)
471 switch (mesaFormat
) {
472 case MESA_FORMAT_RGB_FXT1
:
473 return GL_COMPRESSED_RGB_FXT1_3DFX
;
474 case MESA_FORMAT_RGBA_FXT1
:
475 return GL_COMPRESSED_RGBA_FXT1_3DFX
;
476 case MESA_FORMAT_RGB_DXT1
:
477 return GL_COMPRESSED_RGB_S3TC_DXT1_EXT
;
478 case MESA_FORMAT_RGBA_DXT1
:
479 return GL_COMPRESSED_RGBA_S3TC_DXT1_EXT
;
480 case MESA_FORMAT_RGBA_DXT3
:
481 return GL_COMPRESSED_RGBA_S3TC_DXT3_EXT
;
482 case MESA_FORMAT_RGBA_DXT5
:
483 return GL_COMPRESSED_RGBA_S3TC_DXT5_EXT
;
484 case MESA_FORMAT_SRGB_DXT1
:
485 return GL_COMPRESSED_SRGB_S3TC_DXT1_EXT
;
486 case MESA_FORMAT_SRGBA_DXT1
:
487 return GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT
;
488 case MESA_FORMAT_SRGBA_DXT3
:
489 return GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT
;
490 case MESA_FORMAT_SRGBA_DXT5
:
491 return GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT
;
492 case MESA_FORMAT_R_RGTC1_UNORM
:
493 return GL_COMPRESSED_RED_RGTC1
;
494 case MESA_FORMAT_R_RGTC1_SNORM
:
495 return GL_COMPRESSED_SIGNED_RED_RGTC1
;
496 case MESA_FORMAT_RG_RGTC2_UNORM
:
497 return GL_COMPRESSED_RG_RGTC2
;
498 case MESA_FORMAT_RG_RGTC2_SNORM
:
499 return GL_COMPRESSED_SIGNED_RG_RGTC2
;
501 case MESA_FORMAT_L_LATC1_UNORM
:
502 return GL_COMPRESSED_LUMINANCE_LATC1_EXT
;
503 case MESA_FORMAT_L_LATC1_SNORM
:
504 return GL_COMPRESSED_SIGNED_LUMINANCE_LATC1_EXT
;
505 case MESA_FORMAT_LA_LATC2_UNORM
:
506 return GL_COMPRESSED_LUMINANCE_ALPHA_LATC2_EXT
;
507 case MESA_FORMAT_LA_LATC2_SNORM
:
508 return GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT
;
510 case MESA_FORMAT_ETC1_RGB8
:
511 return GL_ETC1_RGB8_OES
;
512 case MESA_FORMAT_ETC2_RGB8
:
513 return GL_COMPRESSED_RGB8_ETC2
;
514 case MESA_FORMAT_ETC2_SRGB8
:
515 return GL_COMPRESSED_SRGB8_ETC2
;
516 case MESA_FORMAT_ETC2_RGBA8_EAC
:
517 return GL_COMPRESSED_RGBA8_ETC2_EAC
;
518 case MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC
:
519 return GL_COMPRESSED_SRGB8_ALPHA8_ETC2_EAC
;
520 case MESA_FORMAT_ETC2_R11_EAC
:
521 return GL_COMPRESSED_R11_EAC
;
522 case MESA_FORMAT_ETC2_RG11_EAC
:
523 return GL_COMPRESSED_RG11_EAC
;
524 case MESA_FORMAT_ETC2_SIGNED_R11_EAC
:
525 return GL_COMPRESSED_SIGNED_R11_EAC
;
526 case MESA_FORMAT_ETC2_SIGNED_RG11_EAC
:
527 return GL_COMPRESSED_SIGNED_RG11_EAC
;
528 case MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1
:
529 return GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2
;
530 case MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1
:
531 return GL_COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2
;
533 case MESA_FORMAT_BPTC_RGBA_UNORM
:
534 return GL_COMPRESSED_RGBA_BPTC_UNORM
;
535 case MESA_FORMAT_BPTC_SRGB_ALPHA_UNORM
:
536 return GL_COMPRESSED_SRGB_ALPHA_BPTC_UNORM
;
537 case MESA_FORMAT_BPTC_RGB_SIGNED_FLOAT
:
538 return GL_COMPRESSED_RGB_BPTC_SIGNED_FLOAT
;
539 case MESA_FORMAT_BPTC_RGB_UNSIGNED_FLOAT
:
540 return GL_COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT
;
543 _mesa_problem(ctx
, "Unexpected mesa texture format in"
544 " _mesa_compressed_format_to_glenum()");
551 * Return the address of the pixel at (col, row, img) in a
552 * compressed texture image.
553 * \param col, row, img - image position (3D), should be a multiple of the
554 * format's block size.
555 * \param format - compressed image format
556 * \param width - image width (stride) in pixels
557 * \param image - the image address
558 * \return address of pixel at (row, col, img)
561 _mesa_compressed_image_address(GLint col
, GLint row
, GLint img
,
562 mesa_format mesaFormat
,
563 GLsizei width
, const GLubyte
*image
)
565 /* XXX only 2D images implemented, not 3D */
566 const GLuint blockSize
= _mesa_get_format_bytes(mesaFormat
);
570 _mesa_get_format_block_size(mesaFormat
, &bw
, &bh
);
572 assert(col
% bw
== 0);
573 assert(row
% bh
== 0);
575 offset
= ((width
+ bw
- 1) / bw
) * (row
/ bh
) + col
/ bw
;
578 return (GLubyte
*) image
+ offset
;
583 * Return a texel-fetch function for the given format, or NULL if
586 compressed_fetch_func
587 _mesa_get_compressed_fetch_func(mesa_format format
)
590 case MESA_FORMAT_RGB_DXT1
:
591 case MESA_FORMAT_RGBA_DXT1
:
592 case MESA_FORMAT_RGBA_DXT3
:
593 case MESA_FORMAT_RGBA_DXT5
:
594 case MESA_FORMAT_SRGB_DXT1
:
595 case MESA_FORMAT_SRGBA_DXT1
:
596 case MESA_FORMAT_SRGBA_DXT3
:
597 case MESA_FORMAT_SRGBA_DXT5
:
598 return _mesa_get_dxt_fetch_func(format
);
599 case MESA_FORMAT_RGB_FXT1
:
600 case MESA_FORMAT_RGBA_FXT1
:
601 return _mesa_get_fxt_fetch_func(format
);
602 case MESA_FORMAT_R_RGTC1_UNORM
:
603 case MESA_FORMAT_L_LATC1_UNORM
:
604 case MESA_FORMAT_R_RGTC1_SNORM
:
605 case MESA_FORMAT_L_LATC1_SNORM
:
606 case MESA_FORMAT_RG_RGTC2_UNORM
:
607 case MESA_FORMAT_LA_LATC2_UNORM
:
608 case MESA_FORMAT_RG_RGTC2_SNORM
:
609 case MESA_FORMAT_LA_LATC2_SNORM
:
610 return _mesa_get_compressed_rgtc_func(format
);
611 case MESA_FORMAT_ETC1_RGB8
:
612 return _mesa_get_etc_fetch_func(format
);
613 case MESA_FORMAT_BPTC_RGBA_UNORM
:
614 case MESA_FORMAT_BPTC_SRGB_ALPHA_UNORM
:
615 case MESA_FORMAT_BPTC_RGB_SIGNED_FLOAT
:
616 case MESA_FORMAT_BPTC_RGB_UNSIGNED_FLOAT
:
617 return _mesa_get_bptc_fetch_func(format
);
625 * Decompress a compressed texture image, returning a GL_RGBA/GL_FLOAT image.
626 * \param srcRowStride stride in bytes between rows of blocks in the
627 * compressed source image.
630 _mesa_decompress_image(mesa_format format
, GLuint width
, GLuint height
,
631 const GLubyte
*src
, GLint srcRowStride
,
634 compressed_fetch_func fetch
;
636 GLuint bytes
, bw
, bh
;
639 bytes
= _mesa_get_format_bytes(format
);
640 _mesa_get_format_block_size(format
, &bw
, &bh
);
642 fetch
= _mesa_get_compressed_fetch_func(format
);
644 _mesa_problem(NULL
, "Unexpected format in _mesa_decompress_image()");
648 stride
= srcRowStride
* bh
/ bytes
;
650 for (j
= 0; j
< height
; j
++) {
651 for (i
= 0; i
< width
; i
++) {
652 fetch(src
, stride
, i
, j
, dest
);