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.
40 #include "texcompress.h"
41 #include "texcompress_fxt1.h"
42 #include "texcompress_rgtc.h"
43 #include "texcompress_s3tc.h"
44 #include "texcompress_etc.h"
45 #include "texcompress_bptc.h"
49 * Get the GL base format of a specified GL compressed texture format
51 * From page 232 of the OpenGL 3.3 (Compatiblity Profile) spec:
53 * "Compressed Internal Format Base Internal Format Type
54 * --------------------------- -------------------- ---------
55 * COMPRESSED_ALPHA ALPHA Generic
56 * COMPRESSED_LUMINANCE LUMINANCE Generic
57 * COMPRESSED_LUMINANCE_ALPHA LUMINANCE_ALPHA Generic
58 * COMPRESSED_INTENSITY INTENSITY Generic
59 * COMPRESSED_RED RED Generic
60 * COMPRESSED_RG RG Generic
61 * COMPRESSED_RGB RGB Generic
62 * COMPRESSED_RGBA RGBA Generic
63 * COMPRESSED_SRGB RGB Generic
64 * COMPRESSED_SRGB_ALPHA RGBA Generic
65 * COMPRESSED_SLUMINANCE LUMINANCE Generic
66 * COMPRESSED_SLUMINANCE_ALPHA LUMINANCE_ALPHA Generic
67 * COMPRESSED_RED_RGTC1 RED Specific
68 * COMPRESSED_SIGNED_RED_RGTC1 RED Specific
69 * COMPRESSED_RG_RGTC2 RG Specific
70 * COMPRESSED_SIGNED_RG_RGTC2 RG Specific"
73 * The base format of \c format if \c format is a compressed format (either
74 * generic or specific. Otherwise 0 is returned.
77 _mesa_gl_compressed_format_base_format(GLenum format
)
80 case GL_COMPRESSED_RED
:
81 case GL_COMPRESSED_R11_EAC
:
82 case GL_COMPRESSED_RED_RGTC1
:
83 case GL_COMPRESSED_SIGNED_R11_EAC
:
84 case GL_COMPRESSED_SIGNED_RED_RGTC1
:
87 case GL_COMPRESSED_RG
:
88 case GL_COMPRESSED_RG11_EAC
:
89 case GL_COMPRESSED_RG_RGTC2
:
90 case GL_COMPRESSED_SIGNED_RG11_EAC
:
91 case GL_COMPRESSED_SIGNED_RG_RGTC2
:
94 case GL_COMPRESSED_RGB
:
95 case GL_COMPRESSED_SRGB
:
96 case GL_COMPRESSED_RGB_BPTC_SIGNED_FLOAT_ARB
:
97 case GL_COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT_ARB
:
98 case GL_COMPRESSED_RGB_S3TC_DXT1_EXT
:
99 case GL_COMPRESSED_RGB_FXT1_3DFX
:
100 case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT
:
101 case GL_ETC1_RGB8_OES
:
102 case GL_COMPRESSED_RGB8_ETC2
:
103 case GL_COMPRESSED_SRGB8_ETC2
:
106 case GL_COMPRESSED_RGBA
:
107 case GL_COMPRESSED_SRGB_ALPHA
:
108 case GL_COMPRESSED_RGBA_BPTC_UNORM_ARB
:
109 case GL_COMPRESSED_SRGB_ALPHA_BPTC_UNORM_ARB
:
110 case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT
:
111 case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT
:
112 case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT
:
113 case GL_COMPRESSED_RGBA_FXT1_3DFX
:
114 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT
:
115 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT
:
116 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT
:
117 case GL_COMPRESSED_RGBA8_ETC2_EAC
:
118 case GL_COMPRESSED_SRGB8_ALPHA8_ETC2_EAC
:
119 case GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2
:
120 case GL_COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2
:
123 case GL_COMPRESSED_ALPHA
:
126 case GL_COMPRESSED_LUMINANCE
:
127 case GL_COMPRESSED_SLUMINANCE
:
128 case GL_COMPRESSED_LUMINANCE_LATC1_EXT
:
129 case GL_COMPRESSED_SIGNED_LUMINANCE_LATC1_EXT
:
132 case GL_COMPRESSED_LUMINANCE_ALPHA
:
133 case GL_COMPRESSED_SLUMINANCE_ALPHA
:
134 case GL_COMPRESSED_LUMINANCE_ALPHA_LATC2_EXT
:
135 case GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT
:
136 case GL_COMPRESSED_LUMINANCE_ALPHA_3DC_ATI
:
137 return GL_LUMINANCE_ALPHA
;
139 case GL_COMPRESSED_INTENSITY
:
148 * Return list of (and count of) all specific texture compression
149 * formats that are supported.
151 * Some formats are \b not returned by this function. The
152 * \c GL_COMPRESSED_TEXTURE_FORMATS query only returns formats that are
153 * "suitable for general-purpose usage." All texture compression extensions
154 * have taken this to mean either linear RGB or linear RGBA.
156 * The GL_ARB_texture_compress_rgtc spec says:
158 * "19) Should the GL_NUM_COMPRESSED_TEXTURE_FORMATS and
159 * GL_COMPRESSED_TEXTURE_FORMATS queries return the RGTC formats?
163 * The OpenGL 2.1 specification says "The only values returned
164 * by this query [GL_COMPRESSED_TEXTURE_FORMATS"] are those
165 * corresponding to formats suitable for general-purpose usage.
166 * The renderer will not enumerate formats with restrictions that
167 * need to be specifically understood prior to use."
169 * Compressed textures with just red or red-green components are
170 * not general-purpose so should not be returned by these queries
171 * because they have restrictions.
173 * Applications that seek to use the RGTC formats should do so
174 * by looking for this extension's name in the string returned by
175 * glGetString(GL_EXTENSIONS) rather than
176 * what GL_NUM_COMPRESSED_TEXTURE_FORMATS and
177 * GL_COMPRESSED_TEXTURE_FORMATS return."
179 * There is nearly identical wording in the GL_EXT_texture_compression_rgtc
182 * The GL_EXT_texture_rRGB spec says:
184 * "22) Should the new COMPRESSED_SRGB_* formats be listed in an
185 * implementation's GL_COMPRESSED_TEXTURE_FORMATS list?
187 * RESOLVED: No. Section 3.8.1 says formats listed by
188 * GL_COMPRESSED_TEXTURE_FORMATS are "suitable for general-purpose
189 * usage." The non-linear distribution of red, green, and
190 * blue for these sRGB compressed formats makes them not really
193 * The GL_EXT_texture_compression_latc spec says:
195 * "16) Should the GL_NUM_COMPRESSED_TEXTURE_FORMATS and
196 * GL_COMPRESSED_TEXTURE_FORMATS queries return the LATC formats?
200 * The OpenGL 2.1 specification says "The only values returned
201 * by this query [GL_COMPRESSED_TEXTURE_FORMATS"] are those
202 * corresponding to formats suitable for general-purpose usage.
203 * The renderer will not enumerate formats with restrictions that
204 * need to be specifically understood prior to use."
206 * Historically, OpenGL implementation have advertised the RGB and
207 * RGBA versions of the S3TC extensions compressed format tokens
208 * through this mechanism.
210 * The specification is not sufficiently clear about what "suitable
211 * for general-purpose usage" means. Historically that seems to mean
212 * unsigned RGB or unsigned RGBA. The DXT1 format supporting alpha
213 * (GL_COMPRESSED_RGBA_S3TC_DXT1_EXT) is not exposed in the list (at
214 * least for NVIDIA drivers) because the alpha is always 1.0 expect
215 * when it is 0.0 when RGB is required to be black. NVIDIA's even
216 * limits itself to true linear RGB or RGBA formats, specifically
217 * not including EXT_texture_sRGB's sRGB S3TC compressed formats.
219 * Adding luminance and luminance-alpha texture formats (and
220 * certainly signed versions of luminance and luminance-alpha
221 * formats!) invites potential comptaibility problems with old
222 * applications using this mechanism since old applications are
223 * unlikely to expect non-RGB or non-RGBA formats to be advertised
224 * through this mechanism. However no specific misinteractions
225 * with old applications is known.
227 * Applications that seek to use the LATC formats should do so
228 * by looking for this extension's name in the string returned by
229 * glGetString(GL_EXTENSIONS) rather than
230 * what GL_NUM_COMPRESSED_TEXTURE_FORMATS and
231 * GL_COMPRESSED_TEXTURE_FORMATS return."
233 * There is no formal spec for GL_ATI_texture_compression_3dc. Since the
234 * formats added by this extension are luminance-alpha formats, it is
235 * reasonable to expect them to follow the same rules as
236 * GL_EXT_texture_compression_latc. At the very least, Catalyst 11.6 does not
237 * expose the 3dc formats through this mechanism.
239 * The spec for GL_ARB_texture_compression_bptc doesn't mention whether it
240 * should be included in GL_COMPRESSED_TEXTURE_FORMATS. However as it takes a
241 * very long time to compress the textures in this format it's probably not
242 * very useful as a general format where the GL will have to compress it on
245 * \param ctx the GL context
246 * \param formats the resulting format list (may be NULL).
248 * \return number of formats.
251 _mesa_get_compressed_formats(struct gl_context
*ctx
, GLint
*formats
)
254 if (ctx
->Extensions
.TDFX_texture_compression_FXT1
) {
256 formats
[n
++] = GL_COMPRESSED_RGB_FXT1_3DFX
;
257 formats
[n
++] = GL_COMPRESSED_RGBA_FXT1_3DFX
;
264 if (ctx
->Extensions
.EXT_texture_compression_s3tc
) {
266 formats
[n
++] = GL_COMPRESSED_RGB_S3TC_DXT1_EXT
;
267 formats
[n
++] = GL_COMPRESSED_RGBA_S3TC_DXT3_EXT
;
268 formats
[n
++] = GL_COMPRESSED_RGBA_S3TC_DXT5_EXT
;
274 /* The ES and desktop GL specs diverge here.
276 * In desktop OpenGL, the driver can perform online compression of
277 * uncompressed texture data. GL_NUM_COMPRESSED_TEXTURE_FORMATS and
278 * GL_COMPRESSED_TEXTURE_FORMATS give the application a list of
279 * formats that it could ask the driver to compress with some
280 * expectation of quality. The GL_ARB_texture_compression spec
281 * calls this "suitable for general-purpose usage." As noted
282 * above, this means GL_COMPRESSED_RGBA_S3TC_DXT1_EXT is not
283 * included in the list.
285 * In OpenGL ES, the driver never performs compression.
286 * GL_NUM_COMPRESSED_TEXTURE_FORMATS and
287 * GL_COMPRESSED_TEXTURE_FORMATS give the application a list of
288 * formats that the driver can receive from the application. It
289 * is the *complete* list of formats. The
290 * GL_EXT_texture_compression_s3tc spec says:
292 * "New State for OpenGL ES 2.0.25 and 3.0.2 Specifications
294 * The queries for NUM_COMPRESSED_TEXTURE_FORMATS and
295 * COMPRESSED_TEXTURE_FORMATS include
296 * COMPRESSED_RGB_S3TC_DXT1_EXT,
297 * COMPRESSED_RGBA_S3TC_DXT1_EXT,
298 * COMPRESSED_RGBA_S3TC_DXT3_EXT, and
299 * COMPRESSED_RGBA_S3TC_DXT5_EXT."
301 * Note that the addition is only to the OpenGL ES specification!
303 if (_mesa_is_gles(ctx
)) {
305 formats
[n
++] = GL_COMPRESSED_RGBA_S3TC_DXT1_EXT
;
312 /* The GL_OES_compressed_ETC1_RGB8_texture spec says:
316 * The queries for NUM_COMPRESSED_TEXTURE_FORMATS and
317 * COMPRESSED_TEXTURE_FORMATS include ETC1_RGB8_OES."
319 if (_mesa_is_gles(ctx
)
320 && ctx
->Extensions
.OES_compressed_ETC1_RGB8_texture
) {
322 formats
[n
++] = GL_ETC1_RGB8_OES
;
329 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
;
347 if (_mesa_is_gles3(ctx
)) {
349 formats
[n
++] = GL_COMPRESSED_RGB8_ETC2
;
350 formats
[n
++] = GL_COMPRESSED_SRGB8_ETC2
;
351 formats
[n
++] = GL_COMPRESSED_RGBA8_ETC2_EAC
;
352 formats
[n
++] = GL_COMPRESSED_SRGB8_ALPHA8_ETC2_EAC
;
353 formats
[n
++] = GL_COMPRESSED_R11_EAC
;
354 formats
[n
++] = GL_COMPRESSED_RG11_EAC
;
355 formats
[n
++] = GL_COMPRESSED_SIGNED_R11_EAC
;
356 formats
[n
++] = GL_COMPRESSED_SIGNED_RG11_EAC
;
357 formats
[n
++] = GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2
;
358 formats
[n
++] = GL_COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2
;
369 * Convert a compressed MESA_FORMAT_x to a GLenum.
372 _mesa_glenum_to_compressed_format(GLenum format
)
375 case GL_COMPRESSED_RGB_FXT1_3DFX
:
376 return MESA_FORMAT_RGB_FXT1
;
377 case GL_COMPRESSED_RGBA_FXT1_3DFX
:
378 return MESA_FORMAT_RGBA_FXT1
;
380 case GL_COMPRESSED_RGB_S3TC_DXT1_EXT
:
382 return MESA_FORMAT_RGB_DXT1
;
383 case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT
:
385 return MESA_FORMAT_RGBA_DXT1
;
386 case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT
:
388 return MESA_FORMAT_RGBA_DXT3
;
389 case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT
:
391 return MESA_FORMAT_RGBA_DXT5
;
393 case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT
:
394 return MESA_FORMAT_SRGB_DXT1
;
395 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT
:
396 return MESA_FORMAT_SRGBA_DXT1
;
397 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT
:
398 return MESA_FORMAT_SRGBA_DXT3
;
399 case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT
:
400 return MESA_FORMAT_SRGBA_DXT5
;
402 case GL_COMPRESSED_RED_RGTC1
:
403 return MESA_FORMAT_R_RGTC1_UNORM
;
404 case GL_COMPRESSED_SIGNED_RED_RGTC1
:
405 return MESA_FORMAT_R_RGTC1_SNORM
;
406 case GL_COMPRESSED_RG_RGTC2
:
407 return MESA_FORMAT_RG_RGTC2_UNORM
;
408 case GL_COMPRESSED_SIGNED_RG_RGTC2
:
409 return MESA_FORMAT_RG_RGTC2_SNORM
;
411 case GL_COMPRESSED_LUMINANCE_LATC1_EXT
:
412 return MESA_FORMAT_L_LATC1_UNORM
;
413 case GL_COMPRESSED_SIGNED_LUMINANCE_LATC1_EXT
:
414 return MESA_FORMAT_L_LATC1_SNORM
;
415 case GL_COMPRESSED_LUMINANCE_ALPHA_LATC2_EXT
:
416 case GL_COMPRESSED_LUMINANCE_ALPHA_3DC_ATI
:
417 return MESA_FORMAT_LA_LATC2_UNORM
;
418 case GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT
:
419 return MESA_FORMAT_LA_LATC2_SNORM
;
421 case GL_ETC1_RGB8_OES
:
422 return MESA_FORMAT_ETC1_RGB8
;
423 case GL_COMPRESSED_RGB8_ETC2
:
424 return MESA_FORMAT_ETC2_RGB8
;
425 case GL_COMPRESSED_SRGB8_ETC2
:
426 return MESA_FORMAT_ETC2_SRGB8
;
427 case GL_COMPRESSED_RGBA8_ETC2_EAC
:
428 return MESA_FORMAT_ETC2_RGBA8_EAC
;
429 case GL_COMPRESSED_SRGB8_ALPHA8_ETC2_EAC
:
430 return MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC
;
431 case GL_COMPRESSED_R11_EAC
:
432 return MESA_FORMAT_ETC2_R11_EAC
;
433 case GL_COMPRESSED_RG11_EAC
:
434 return MESA_FORMAT_ETC2_RG11_EAC
;
435 case GL_COMPRESSED_SIGNED_R11_EAC
:
436 return MESA_FORMAT_ETC2_SIGNED_R11_EAC
;
437 case GL_COMPRESSED_SIGNED_RG11_EAC
:
438 return MESA_FORMAT_ETC2_SIGNED_RG11_EAC
;
439 case GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2
:
440 return MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1
;
441 case GL_COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2
:
442 return MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1
;
444 case GL_COMPRESSED_RGBA_BPTC_UNORM
:
445 return MESA_FORMAT_BPTC_RGBA_UNORM
;
446 case GL_COMPRESSED_SRGB_ALPHA_BPTC_UNORM
:
447 return MESA_FORMAT_BPTC_SRGB_ALPHA_UNORM
;
448 case GL_COMPRESSED_RGB_BPTC_SIGNED_FLOAT
:
449 return MESA_FORMAT_BPTC_RGB_SIGNED_FLOAT
;
450 case GL_COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT
:
451 return MESA_FORMAT_BPTC_RGB_UNSIGNED_FLOAT
;
454 return MESA_FORMAT_NONE
;
460 * Given a compressed MESA_FORMAT_x value, return the corresponding
461 * GLenum for that format.
462 * This is needed for glGetTexLevelParameter(GL_TEXTURE_INTERNAL_FORMAT)
463 * which must return the specific texture format used when the user might
464 * have originally specified a generic compressed format in their
465 * glTexImage2D() call.
466 * For non-compressed textures, we always return the user-specified
467 * internal format unchanged.
470 _mesa_compressed_format_to_glenum(struct gl_context
*ctx
, mesa_format mesaFormat
)
472 switch (mesaFormat
) {
473 case MESA_FORMAT_RGB_FXT1
:
474 return GL_COMPRESSED_RGB_FXT1_3DFX
;
475 case MESA_FORMAT_RGBA_FXT1
:
476 return GL_COMPRESSED_RGBA_FXT1_3DFX
;
477 case MESA_FORMAT_RGB_DXT1
:
478 return GL_COMPRESSED_RGB_S3TC_DXT1_EXT
;
479 case MESA_FORMAT_RGBA_DXT1
:
480 return GL_COMPRESSED_RGBA_S3TC_DXT1_EXT
;
481 case MESA_FORMAT_RGBA_DXT3
:
482 return GL_COMPRESSED_RGBA_S3TC_DXT3_EXT
;
483 case MESA_FORMAT_RGBA_DXT5
:
484 return GL_COMPRESSED_RGBA_S3TC_DXT5_EXT
;
485 case MESA_FORMAT_SRGB_DXT1
:
486 return GL_COMPRESSED_SRGB_S3TC_DXT1_EXT
;
487 case MESA_FORMAT_SRGBA_DXT1
:
488 return GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT
;
489 case MESA_FORMAT_SRGBA_DXT3
:
490 return GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT
;
491 case MESA_FORMAT_SRGBA_DXT5
:
492 return GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT
;
493 case MESA_FORMAT_R_RGTC1_UNORM
:
494 return GL_COMPRESSED_RED_RGTC1
;
495 case MESA_FORMAT_R_RGTC1_SNORM
:
496 return GL_COMPRESSED_SIGNED_RED_RGTC1
;
497 case MESA_FORMAT_RG_RGTC2_UNORM
:
498 return GL_COMPRESSED_RG_RGTC2
;
499 case MESA_FORMAT_RG_RGTC2_SNORM
:
500 return GL_COMPRESSED_SIGNED_RG_RGTC2
;
502 case MESA_FORMAT_L_LATC1_UNORM
:
503 return GL_COMPRESSED_LUMINANCE_LATC1_EXT
;
504 case MESA_FORMAT_L_LATC1_SNORM
:
505 return GL_COMPRESSED_SIGNED_LUMINANCE_LATC1_EXT
;
506 case MESA_FORMAT_LA_LATC2_UNORM
:
507 return GL_COMPRESSED_LUMINANCE_ALPHA_LATC2_EXT
;
508 case MESA_FORMAT_LA_LATC2_SNORM
:
509 return GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT
;
511 case MESA_FORMAT_ETC1_RGB8
:
512 return GL_ETC1_RGB8_OES
;
513 case MESA_FORMAT_ETC2_RGB8
:
514 return GL_COMPRESSED_RGB8_ETC2
;
515 case MESA_FORMAT_ETC2_SRGB8
:
516 return GL_COMPRESSED_SRGB8_ETC2
;
517 case MESA_FORMAT_ETC2_RGBA8_EAC
:
518 return GL_COMPRESSED_RGBA8_ETC2_EAC
;
519 case MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC
:
520 return GL_COMPRESSED_SRGB8_ALPHA8_ETC2_EAC
;
521 case MESA_FORMAT_ETC2_R11_EAC
:
522 return GL_COMPRESSED_R11_EAC
;
523 case MESA_FORMAT_ETC2_RG11_EAC
:
524 return GL_COMPRESSED_RG11_EAC
;
525 case MESA_FORMAT_ETC2_SIGNED_R11_EAC
:
526 return GL_COMPRESSED_SIGNED_R11_EAC
;
527 case MESA_FORMAT_ETC2_SIGNED_RG11_EAC
:
528 return GL_COMPRESSED_SIGNED_RG11_EAC
;
529 case MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1
:
530 return GL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2
;
531 case MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1
:
532 return GL_COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2
;
534 case MESA_FORMAT_BPTC_RGBA_UNORM
:
535 return GL_COMPRESSED_RGBA_BPTC_UNORM
;
536 case MESA_FORMAT_BPTC_SRGB_ALPHA_UNORM
:
537 return GL_COMPRESSED_SRGB_ALPHA_BPTC_UNORM
;
538 case MESA_FORMAT_BPTC_RGB_SIGNED_FLOAT
:
539 return GL_COMPRESSED_RGB_BPTC_SIGNED_FLOAT
;
540 case MESA_FORMAT_BPTC_RGB_UNSIGNED_FLOAT
:
541 return GL_COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT
;
544 _mesa_problem(ctx
, "Unexpected mesa texture format in"
545 " _mesa_compressed_format_to_glenum()");
552 * Return the address of the pixel at (col, row, img) in a
553 * compressed texture image.
554 * \param col, row, img - image position (3D), should be a multiple of the
555 * format's block size.
556 * \param format - compressed image format
557 * \param width - image width (stride) in pixels
558 * \param image - the image address
559 * \return address of pixel at (row, col, img)
562 _mesa_compressed_image_address(GLint col
, GLint row
, GLint img
,
563 mesa_format mesaFormat
,
564 GLsizei width
, const GLubyte
*image
)
566 /* XXX only 2D images implemented, not 3D */
567 const GLuint blockSize
= _mesa_get_format_bytes(mesaFormat
);
571 _mesa_get_format_block_size(mesaFormat
, &bw
, &bh
);
573 assert(col
% bw
== 0);
574 assert(row
% bh
== 0);
576 offset
= ((width
+ bw
- 1) / bw
) * (row
/ bh
) + col
/ bw
;
579 return (GLubyte
*) image
+ offset
;
584 * Return a texel-fetch function for the given format, or NULL if
587 compressed_fetch_func
588 _mesa_get_compressed_fetch_func(mesa_format format
)
591 case MESA_FORMAT_RGB_DXT1
:
592 case MESA_FORMAT_RGBA_DXT1
:
593 case MESA_FORMAT_RGBA_DXT3
:
594 case MESA_FORMAT_RGBA_DXT5
:
595 case MESA_FORMAT_SRGB_DXT1
:
596 case MESA_FORMAT_SRGBA_DXT1
:
597 case MESA_FORMAT_SRGBA_DXT3
:
598 case MESA_FORMAT_SRGBA_DXT5
:
599 return _mesa_get_dxt_fetch_func(format
);
600 case MESA_FORMAT_RGB_FXT1
:
601 case MESA_FORMAT_RGBA_FXT1
:
602 return _mesa_get_fxt_fetch_func(format
);
603 case MESA_FORMAT_R_RGTC1_UNORM
:
604 case MESA_FORMAT_L_LATC1_UNORM
:
605 case MESA_FORMAT_R_RGTC1_SNORM
:
606 case MESA_FORMAT_L_LATC1_SNORM
:
607 case MESA_FORMAT_RG_RGTC2_UNORM
:
608 case MESA_FORMAT_LA_LATC2_UNORM
:
609 case MESA_FORMAT_RG_RGTC2_SNORM
:
610 case MESA_FORMAT_LA_LATC2_SNORM
:
611 return _mesa_get_compressed_rgtc_func(format
);
612 case MESA_FORMAT_ETC1_RGB8
:
613 return _mesa_get_etc_fetch_func(format
);
614 case MESA_FORMAT_BPTC_RGBA_UNORM
:
615 case MESA_FORMAT_BPTC_SRGB_ALPHA_UNORM
:
616 case MESA_FORMAT_BPTC_RGB_SIGNED_FLOAT
:
617 case MESA_FORMAT_BPTC_RGB_UNSIGNED_FLOAT
:
618 return _mesa_get_bptc_fetch_func(format
);
626 * Decompress a compressed texture image, returning a GL_RGBA/GL_FLOAT image.
627 * \param srcRowStride stride in bytes between rows of blocks in the
628 * compressed source image.
631 _mesa_decompress_image(mesa_format format
, GLuint width
, GLuint height
,
632 const GLubyte
*src
, GLint srcRowStride
,
635 compressed_fetch_func fetch
;
637 GLuint bytes
, bw
, bh
;
640 bytes
= _mesa_get_format_bytes(format
);
641 _mesa_get_format_block_size(format
, &bw
, &bh
);
643 fetch
= _mesa_get_compressed_fetch_func(format
);
645 _mesa_problem(NULL
, "Unexpected format in _mesa_decompress_image()");
649 stride
= srcRowStride
* bh
/ bytes
;
651 for (j
= 0; j
< height
; j
++) {
652 for (i
= 0; i
< width
; i
++) {
653 fetch(src
, stride
, i
, j
, dest
);