2 * Copyright (C) 2011 LunarG, Inc.
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
25 * \file texcompress_etc.c
26 * GL_OES_compressed_ETC1_RGB8_texture support.
27 * Supported ETC2 texture formats are:
28 * GL_COMPRESSED_RGB8_ETC2
29 * GL_COMPRESSED_SRGB8_ETC2
30 * GL_COMPRESSED_RGBA8_ETC2_EAC
31 * GL_COMPRESSED_SRGB8_ALPHA8_ETC2_EAC
32 * GL_COMPRESSED_R11_EAC
33 * GL_COMPRESSED_RG11_EAC
34 * GL_COMPRESSED_SIGNED_R11_EAC
35 * GL_COMPRESSED_SIGNED_RG11_EAC
36 * MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1
37 * MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1
41 #include "texcompress.h"
42 #include "texcompress_etc.h"
45 #include "format_unpack.h"
50 uint64_t pixel_indices
[2];
51 const int *modifier_tables
[2];
59 uint8_t base_colors
[3][3];
60 uint8_t paint_colors
[4][3];
61 uint8_t base_codeword
;
66 static const int etc2_distance_table
[8] = {
67 3, 6, 11, 16, 23, 32, 41, 64 };
69 static const int etc2_modifier_tables
[16][8] = {
70 { -3, -6, -9, -15, 2, 5, 8, 14},
71 { -3, -7, -10, -13, 2, 6, 9, 12},
72 { -2, -5, -8, -13, 1, 4, 7, 12},
73 { -2, -4, -6, -13, 1, 3, 5, 12},
74 { -3, -6, -8, -12, 2, 5, 7, 11},
75 { -3, -7, -9, -11, 2, 6, 8, 10},
76 { -4, -7, -8, -11, 3, 6, 7, 10},
77 { -3, -5, -8, -11, 2, 4, 7, 10},
78 { -2, -6, -8, -10, 1, 5, 7, 9},
79 { -2, -5, -8, -10, 1, 4, 7, 9},
80 { -2, -4, -8, -10, 1, 3, 7, 9},
81 { -2, -5, -7, -10, 1, 4, 6, 9},
82 { -3, -4, -7, -10, 2, 3, 6, 9},
83 { -1, -2, -3, -10, 0, 1, 2, 9},
84 { -4, -6, -8, -9, 3, 5, 7, 8},
85 { -3, -5, -7, -9, 2, 4, 6, 8},
88 static const int etc2_modifier_tables_non_opaque
[8][4] = {
99 /* define etc1_parse_block and etc. */
100 #define UINT8_TYPE GLubyte
102 #include "texcompress_etc_tmp.h"
107 _mesa_texstore_etc1_rgb8(TEXSTORE_PARAMS
)
109 /* GL_ETC1_RGB8_OES is only valid in glCompressedTexImage2D */
117 * Decode texture data in format `MESA_FORMAT_ETC1_RGB8` to
118 * `MESA_FORMAT_ABGR8888`.
120 * The size of the source data must be a multiple of the ETC1 block size,
121 * which is 8, even if the texture image's dimensions are not aligned to 4.
122 * From the GL_OES_compressed_ETC1_RGB8_texture spec:
123 * The texture is described as a number of 4x4 pixel blocks. If the
124 * texture (or a particular mip-level) is smaller than 4 pixels in
125 * any dimension (such as a 2x2 or a 8x1 texture), the texture is
126 * found in the upper left part of the block(s), and the rest of the
127 * pixels are not used. For instance, a texture of size 4x2 will be
128 * placed in the upper half of a 4x4 block, and the lower half of the
129 * pixels in the block will not be accessed.
131 * \param src_width in pixels
132 * \param src_height in pixels
133 * \param dst_stride in bytes
136 _mesa_etc1_unpack_rgba8888(uint8_t *dst_row
,
138 const uint8_t *src_row
,
143 etc1_unpack_rgba8888(dst_row
, dst_stride
,
145 src_width
, src_height
);
149 etc2_base_color1_t_mode(const uint8_t *in
, GLuint index
)
151 uint8_t R1a
= 0, x
= 0;
152 /* base col 1 = extend_4to8bits( (R1a << 2) | R1b, G1, B1) */
155 R1a
= (in
[0] >> 3) & 0x3;
156 x
= ((R1a
<< 2) | (in
[0] & 0x3));
159 x
= ((in
[1] >> 4) & 0xf);
168 return ((x
<< 4) | (x
& 0xf));
172 etc2_base_color2_t_mode(const uint8_t *in
, GLuint index
)
175 /*extend 4to8bits(R2, G2, B2)*/
178 x
= ((in
[2] >> 4) & 0xf );
184 x
= ((in
[3] >> 4) & 0xf);
190 return ((x
<< 4) | (x
& 0xf));
194 etc2_base_color1_h_mode(const uint8_t *in
, GLuint index
)
197 /* base col 1 = extend 4to8bits(R1, (G1a << 1) | G1b, (B1a << 3) | B1b) */
200 x
= ((in
[0] >> 3) & 0xf);
203 x
= (((in
[0] & 0x7) << 1) | ((in
[1] >> 4) & 0x1));
207 (((in
[1] & 0x3) << 1) | ((in
[2] >> 7) & 0x1)));
213 return ((x
<< 4) | (x
& 0xf));
217 etc2_base_color2_h_mode(const uint8_t *in
, GLuint index
)
220 /* base col 2 = extend 4to8bits(R2, G2, B2) */
223 x
= ((in
[2] >> 3) & 0xf );
226 x
= (((in
[2] & 0x7) << 1) | ((in
[3] >> 7) & 0x1));
229 x
= ((in
[3] >> 3) & 0xf);
235 return ((x
<< 4) | (x
& 0xf));
239 etc2_base_color_o_planar(const uint8_t *in
, GLuint index
)
244 tmp
= ((in
[0] >> 1) & 0x3f); /* RO */
245 return ((tmp
<< 2) | (tmp
>> 4));
247 tmp
= (((in
[0] & 0x1) << 6) | /* GO1 */
248 ((in
[1] >> 1) & 0x3f)); /* GO2 */
249 return ((tmp
<< 1) | (tmp
>> 6));
251 tmp
= (((in
[1] & 0x1) << 5) | /* BO1 */
252 (in
[2] & 0x18) | /* BO2 */
253 (((in
[2] & 0x3) << 1) | ((in
[3] >> 7) & 0x1))); /* BO3 */
254 return ((tmp
<< 2) | (tmp
>> 4));
262 etc2_base_color_h_planar(const uint8_t *in
, GLuint index
)
267 tmp
= (((in
[3] & 0x7c) >> 1) | /* RH1 */
268 (in
[3] & 0x1)); /* RH2 */
269 return ((tmp
<< 2) | (tmp
>> 4));
271 tmp
= (in
[4] >> 1) & 0x7f; /* GH */
272 return ((tmp
<< 1) | (tmp
>> 6));
274 tmp
= (((in
[4] & 0x1) << 5) |
275 ((in
[5] >> 3) & 0x1f)); /* BH */
276 return ((tmp
<< 2) | (tmp
>> 4));
284 etc2_base_color_v_planar(const uint8_t *in
, GLuint index
)
289 tmp
= (((in
[5] & 0x7) << 0x3) |
290 ((in
[6] >> 5) & 0x7)); /* RV */
291 return ((tmp
<< 2) | (tmp
>> 4));
293 tmp
= (((in
[6] & 0x1f) << 2) |
294 ((in
[7] >> 6) & 0x3)); /* GV */
295 return ((tmp
<< 1) | (tmp
>> 6));
297 tmp
= in
[7] & 0x3f; /* BV */
298 return ((tmp
<< 2) | (tmp
>> 4));
306 etc2_get_pixel_index(const struct etc2_block
*block
, int x
, int y
)
308 int bit
= ((3 - y
) + (3 - x
) * 4) * 3;
309 int idx
= (block
->pixel_indices
[1] >> bit
) & 0x7;
314 etc2_clamp(int color
)
316 /* CLAMP(color, 0, 255) */
317 return (uint8_t) CLAMP(color
, 0, 255);
321 etc2_clamp2(int color
)
323 /* CLAMP(color, 0, 2047) */
324 return (GLushort
) CLAMP(color
, 0, 2047);
328 etc2_clamp3(int color
)
330 /* CLAMP(color, -1023, 1023) */
331 return (GLshort
) CLAMP(color
, -1023, 1023);
335 etc2_rgb8_parse_block(struct etc2_block
*block
,
337 GLboolean punchthrough_alpha
)
340 GLboolean diffbit
= false;
341 static const int lookup
[8] = { 0, 1, 2, 3, -4, -3, -2, -1 };
343 const int R_plus_dR
= (src
[0] >> 3) + lookup
[src
[0] & 0x7];
344 const int G_plus_dG
= (src
[1] >> 3) + lookup
[src
[1] & 0x7];
345 const int B_plus_dB
= (src
[2] >> 3) + lookup
[src
[2] & 0x7];
347 /* Reset the mode flags */
348 block
->is_ind_mode
= false;
349 block
->is_diff_mode
= false;
350 block
->is_t_mode
= false;
351 block
->is_h_mode
= false;
352 block
->is_planar_mode
= false;
354 if (punchthrough_alpha
)
355 block
->opaque
= src
[3] & 0x2;
357 diffbit
= src
[3] & 0x2;
359 if (!diffbit
&& !punchthrough_alpha
) {
360 /* individual mode */
361 block
->is_ind_mode
= true;
363 for (i
= 0; i
< 3; i
++) {
364 /* Texture decode algorithm is same for individual mode in etc1
367 block
->base_colors
[0][i
] = etc1_base_color_ind_hi(src
[i
]);
368 block
->base_colors
[1][i
] = etc1_base_color_ind_lo(src
[i
]);
371 else if (R_plus_dR
< 0 || R_plus_dR
> 31){
373 block
->is_t_mode
= true;
375 for(i
= 0; i
< 3; i
++) {
376 block
->base_colors
[0][i
] = etc2_base_color1_t_mode(src
, i
);
377 block
->base_colors
[1][i
] = etc2_base_color2_t_mode(src
, i
);
381 etc2_distance_table
[(((src
[3] >> 2) & 0x3) << 1) |
384 for (i
= 0; i
< 3; i
++) {
385 block
->paint_colors
[0][i
] = etc2_clamp(block
->base_colors
[0][i
]);
386 block
->paint_colors
[1][i
] = etc2_clamp(block
->base_colors
[1][i
] +
388 block
->paint_colors
[2][i
] = etc2_clamp(block
->base_colors
[1][i
]);
389 block
->paint_colors
[3][i
] = etc2_clamp(block
->base_colors
[1][i
] -
393 else if (G_plus_dG
< 0 || G_plus_dG
> 31){
394 int base_color_1_value
, base_color_2_value
;
397 block
->is_h_mode
= true;
399 for(i
= 0; i
< 3; i
++) {
400 block
->base_colors
[0][i
] = etc2_base_color1_h_mode(src
, i
);
401 block
->base_colors
[1][i
] = etc2_base_color2_h_mode(src
, i
);
404 base_color_1_value
= (block
->base_colors
[0][0] << 16) +
405 (block
->base_colors
[0][1] << 8) +
406 block
->base_colors
[0][2];
407 base_color_2_value
= (block
->base_colors
[1][0] << 16) +
408 (block
->base_colors
[1][1] << 8) +
409 block
->base_colors
[1][2];
412 etc2_distance_table
[(src
[3] & 0x4) |
413 ((src
[3] & 0x1) << 1) |
414 (base_color_1_value
>= base_color_2_value
)];
416 for (i
= 0; i
< 3; i
++) {
417 block
->paint_colors
[0][i
] = etc2_clamp(block
->base_colors
[0][i
] +
419 block
->paint_colors
[1][i
] = etc2_clamp(block
->base_colors
[0][i
] -
421 block
->paint_colors
[2][i
] = etc2_clamp(block
->base_colors
[1][i
] +
423 block
->paint_colors
[3][i
] = etc2_clamp(block
->base_colors
[1][i
] -
427 else if (B_plus_dB
< 0 || B_plus_dB
> 31) {
429 block
->is_planar_mode
= true;
431 /* opaque bit must be set in planar mode */
433 block
->opaque
= true;
435 for (i
= 0; i
< 3; i
++) {
436 block
->base_colors
[0][i
] = etc2_base_color_o_planar(src
, i
);
437 block
->base_colors
[1][i
] = etc2_base_color_h_planar(src
, i
);
438 block
->base_colors
[2][i
] = etc2_base_color_v_planar(src
, i
);
441 else if (diffbit
|| punchthrough_alpha
) {
442 /* differential mode */
443 block
->is_diff_mode
= true;
445 for (i
= 0; i
< 3; i
++) {
446 /* Texture decode algorithm is same for differential mode in etc1
449 block
->base_colors
[0][i
] = etc1_base_color_diff_hi(src
[i
]);
450 block
->base_colors
[1][i
] = etc1_base_color_diff_lo(src
[i
]);
454 if (block
->is_ind_mode
|| block
->is_diff_mode
) {
455 int table1_idx
= (src
[3] >> 5) & 0x7;
456 int table2_idx
= (src
[3] >> 2) & 0x7;
458 /* Use same modifier tables as for etc1 textures if opaque bit is set
459 * or if non punchthrough texture format
461 block
->modifier_tables
[0] = (block
->opaque
|| !punchthrough_alpha
) ?
462 etc1_modifier_tables
[table1_idx
] :
463 etc2_modifier_tables_non_opaque
[table1_idx
];
464 block
->modifier_tables
[1] = (block
->opaque
|| !punchthrough_alpha
) ?
465 etc1_modifier_tables
[table2_idx
] :
466 etc2_modifier_tables_non_opaque
[table2_idx
];
468 block
->flipped
= (src
[3] & 0x1);
471 block
->pixel_indices
[0] =
472 (src
[4] << 24) | (src
[5] << 16) | (src
[6] << 8) | src
[7];
476 etc2_rgb8_fetch_texel(const struct etc2_block
*block
,
477 int x
, int y
, uint8_t *dst
,
478 GLboolean punchthrough_alpha
)
480 const uint8_t *base_color
;
481 int modifier
, bit
, idx
, blk
;
483 /* get pixel index */
485 idx
= ((block
->pixel_indices
[0] >> (15 + bit
)) & 0x2) |
486 ((block
->pixel_indices
[0] >> (bit
)) & 0x1);
488 if (block
->is_ind_mode
|| block
->is_diff_mode
) {
489 /* check for punchthrough_alpha format */
490 if (punchthrough_alpha
) {
491 if (!block
->opaque
&& idx
== 2) {
492 dst
[0] = dst
[1] = dst
[2] = dst
[3] = 0;
499 /* Use pixel index and subblock to get the modifier */
500 blk
= (block
->flipped
) ? (y
>= 2) : (x
>= 2);
501 base_color
= block
->base_colors
[blk
];
502 modifier
= block
->modifier_tables
[blk
][idx
];
504 dst
[0] = etc2_clamp(base_color
[0] + modifier
);
505 dst
[1] = etc2_clamp(base_color
[1] + modifier
);
506 dst
[2] = etc2_clamp(base_color
[2] + modifier
);
508 else if (block
->is_t_mode
|| block
->is_h_mode
) {
509 /* check for punchthrough_alpha format */
510 if (punchthrough_alpha
) {
511 if (!block
->opaque
&& idx
== 2) {
512 dst
[0] = dst
[1] = dst
[2] = dst
[3] = 0;
519 /* Use pixel index to pick one of the paint colors */
520 dst
[0] = block
->paint_colors
[idx
][0];
521 dst
[1] = block
->paint_colors
[idx
][1];
522 dst
[2] = block
->paint_colors
[idx
][2];
524 else if (block
->is_planar_mode
) {
525 /* {R(x, y) = clamp255((x × (RH − RO) + y × (RV − RO) + 4 × RO + 2) >> 2)
526 * {G(x, y) = clamp255((x × (GH − GO) + y × (GV − GO) + 4 × GO + 2) >> 2)
527 * {B(x, y) = clamp255((x × (BH − BO) + y × (BV − BO) + 4 × BO + 2) >> 2)
529 int red
, green
, blue
;
530 red
= (x
* (block
->base_colors
[1][0] - block
->base_colors
[0][0]) +
531 y
* (block
->base_colors
[2][0] - block
->base_colors
[0][0]) +
532 4 * block
->base_colors
[0][0] + 2) >> 2;
534 green
= (x
* (block
->base_colors
[1][1] - block
->base_colors
[0][1]) +
535 y
* (block
->base_colors
[2][1] - block
->base_colors
[0][1]) +
536 4 * block
->base_colors
[0][1] + 2) >> 2;
538 blue
= (x
* (block
->base_colors
[1][2] - block
->base_colors
[0][2]) +
539 y
* (block
->base_colors
[2][2] - block
->base_colors
[0][2]) +
540 4 * block
->base_colors
[0][2] + 2) >> 2;
542 dst
[0] = etc2_clamp(red
);
543 dst
[1] = etc2_clamp(green
);
544 dst
[2] = etc2_clamp(blue
);
546 /* check for punchthrough_alpha format */
547 if (punchthrough_alpha
)
553 etc2_alpha8_fetch_texel(const struct etc2_block
*block
,
554 int x
, int y
, uint8_t *dst
)
556 int modifier
, alpha
, idx
;
557 /* get pixel index */
558 idx
= etc2_get_pixel_index(block
, x
, y
);
559 modifier
= etc2_modifier_tables
[block
->table_index
][idx
];
560 alpha
= block
->base_codeword
+ modifier
* block
->multiplier
;
561 dst
[3] = etc2_clamp(alpha
);
565 etc2_r11_fetch_texel(const struct etc2_block
*block
,
566 int x
, int y
, uint8_t *dst
)
570 /* Get pixel index */
571 idx
= etc2_get_pixel_index(block
, x
, y
);
572 modifier
= etc2_modifier_tables
[block
->table_index
][idx
];
574 if (block
->multiplier
!= 0)
575 /* clamp2(base codeword × 8 + 4 + modifier × multiplier × 8) */
576 color
= etc2_clamp2(((block
->base_codeword
<< 3) | 0x4) +
577 ((modifier
* block
->multiplier
) << 3));
579 color
= etc2_clamp2(((block
->base_codeword
<< 3) | 0x4) + modifier
);
581 /* Extend 11 bits color value to 16 bits. OpenGL ES 3.0 specification
582 * allows extending the color value to any number of bits. But, an
583 * implementation is not allowed to truncate the 11-bit value to less than
586 color
= (color
<< 5) | (color
>> 6);
587 ((GLushort
*)dst
)[0] = color
;
591 etc2_signed_r11_fetch_texel(const struct etc2_block
*block
,
592 int x
, int y
, uint8_t *dst
)
596 GLbyte base_codeword
= (GLbyte
) block
->base_codeword
;
598 if (base_codeword
== -128)
599 base_codeword
= -127;
601 /* Get pixel index */
602 idx
= etc2_get_pixel_index(block
, x
, y
);
603 modifier
= etc2_modifier_tables
[block
->table_index
][idx
];
605 if (block
->multiplier
!= 0)
606 /* clamp3(base codeword × 8 + modifier × multiplier × 8) */
607 color
= etc2_clamp3((base_codeword
<< 3) +
608 ((modifier
* block
->multiplier
) << 3));
610 color
= etc2_clamp3((base_codeword
<< 3) + modifier
);
612 /* Extend 11 bits color value to 16 bits. OpenGL ES 3.0 specification
613 * allows extending the color value to any number of bits. But, an
614 * implementation is not allowed to truncate the 11-bit value to less than
615 * 11 bits. A negative 11-bit value must first be made positive before bit
616 * replication, and then made negative again
619 color
= (color
<< 5) | (color
>> 5);
622 color
= (color
<< 5) | (color
>> 5);
625 ((GLshort
*)dst
)[0] = color
;
629 etc2_alpha8_parse_block(struct etc2_block
*block
, const uint8_t *src
)
631 block
->base_codeword
= src
[0];
632 block
->multiplier
= (src
[1] >> 4) & 0xf;
633 block
->table_index
= src
[1] & 0xf;
634 block
->pixel_indices
[1] = (((uint64_t)src
[2] << 40) |
635 ((uint64_t)src
[3] << 32) |
636 ((uint64_t)src
[4] << 24) |
637 ((uint64_t)src
[5] << 16) |
638 ((uint64_t)src
[6] << 8) |
643 etc2_r11_parse_block(struct etc2_block
*block
, const uint8_t *src
)
645 /* Parsing logic remains same as for etc2_alpha8_parse_block */
646 etc2_alpha8_parse_block(block
, src
);
650 etc2_rgba8_parse_block(struct etc2_block
*block
, const uint8_t *src
)
652 /* RGB component is parsed the same way as for MESA_FORMAT_ETC2_RGB8 */
653 etc2_rgb8_parse_block(block
, src
+ 8,
654 false /* punchthrough_alpha */);
655 /* Parse Alpha component */
656 etc2_alpha8_parse_block(block
, src
);
660 etc2_rgba8_fetch_texel(const struct etc2_block
*block
,
661 int x
, int y
, uint8_t *dst
)
663 etc2_rgb8_fetch_texel(block
, x
, y
, dst
,
664 false /* punchthrough_alpha */);
665 etc2_alpha8_fetch_texel(block
, x
, y
, dst
);
669 etc2_unpack_rgb8(uint8_t *dst_row
,
671 const uint8_t *src_row
,
676 const unsigned bw
= 4, bh
= 4, bs
= 8, comps
= 4;
677 struct etc2_block block
;
680 for (y
= 0; y
< height
; y
+= bh
) {
681 const uint8_t *src
= src_row
;
683 for (x
= 0; x
< width
; x
+= bw
) {
684 etc2_rgb8_parse_block(&block
, src
,
685 false /* punchthrough_alpha */);
687 for (j
= 0; j
< bh
; j
++) {
688 uint8_t *dst
= dst_row
+ (y
+ j
) * dst_stride
+ x
* comps
;
689 for (i
= 0; i
< bw
; i
++) {
690 etc2_rgb8_fetch_texel(&block
, i
, j
, dst
,
691 false /* punchthrough_alpha */);
700 src_row
+= src_stride
;
705 etc2_unpack_srgb8(uint8_t *dst_row
,
707 const uint8_t *src_row
,
712 const unsigned bw
= 4, bh
= 4, bs
= 8, comps
= 4;
713 struct etc2_block block
;
717 for (y
= 0; y
< height
; y
+= bh
) {
718 const uint8_t *src
= src_row
;
720 for (x
= 0; x
< width
; x
+= bw
) {
721 etc2_rgb8_parse_block(&block
, src
,
722 false /* punchthrough_alpha */);
724 for (j
= 0; j
< bh
; j
++) {
725 uint8_t *dst
= dst_row
+ (y
+ j
) * dst_stride
+ x
* comps
;
726 for (i
= 0; i
< bw
; i
++) {
727 etc2_rgb8_fetch_texel(&block
, i
, j
, dst
,
728 false /* punchthrough_alpha */);
729 /* Convert to MESA_FORMAT_SARGB8 */
741 src_row
+= src_stride
;
746 etc2_unpack_rgba8(uint8_t *dst_row
,
748 const uint8_t *src_row
,
753 /* If internalformat is COMPRESSED_RGBA8_ETC2_EAC, each 4 × 4 block of
754 * RGBA8888 information is compressed to 128 bits. To decode a block, the
755 * two 64-bit integers int64bitAlpha and int64bitColor are calculated.
757 const unsigned bw
= 4, bh
= 4, bs
= 16, comps
= 4;
758 struct etc2_block block
;
761 for (y
= 0; y
< height
; y
+= bh
) {
762 const uint8_t *src
= src_row
;
764 for (x
= 0; x
< width
; x
+= bw
) {
765 etc2_rgba8_parse_block(&block
, src
);
767 for (j
= 0; j
< bh
; j
++) {
768 uint8_t *dst
= dst_row
+ (y
+ j
) * dst_stride
+ x
* comps
;
769 for (i
= 0; i
< bw
; i
++) {
770 etc2_rgba8_fetch_texel(&block
, i
, j
, dst
);
777 src_row
+= src_stride
;
782 etc2_unpack_srgb8_alpha8(uint8_t *dst_row
,
784 const uint8_t *src_row
,
789 /* If internalformat is COMPRESSED_SRGB8_ALPHA8_ETC2_EAC, each 4 × 4 block
790 * of RGBA8888 information is compressed to 128 bits. To decode a block, the
791 * two 64-bit integers int64bitAlpha and int64bitColor are calculated.
793 const unsigned bw
= 4, bh
= 4, bs
= 16, comps
= 4;
794 struct etc2_block block
;
798 for (y
= 0; y
< height
; y
+= bh
) {
799 const uint8_t *src
= src_row
;
801 for (x
= 0; x
< width
; x
+= bw
) {
802 etc2_rgba8_parse_block(&block
, src
);
804 for (j
= 0; j
< bh
; j
++) {
805 uint8_t *dst
= dst_row
+ (y
+ j
) * dst_stride
+ x
* comps
;
806 for (i
= 0; i
< bw
; i
++) {
807 etc2_rgba8_fetch_texel(&block
, i
, j
, dst
);
809 /* Convert to MESA_FORMAT_SARGB8 */
821 src_row
+= src_stride
;
826 etc2_unpack_r11(uint8_t *dst_row
,
828 const uint8_t *src_row
,
833 /* If internalformat is COMPRESSED_R11_EAC, each 4 × 4 block of
834 color information is compressed to 64 bits.
836 const unsigned bw
= 4, bh
= 4, bs
= 8, comps
= 1, comp_size
= 2;
837 struct etc2_block block
;
840 for (y
= 0; y
< height
; y
+= bh
) {
841 const uint8_t *src
= src_row
;
843 for (x
= 0; x
< width
; x
+= bw
) {
844 etc2_r11_parse_block(&block
, src
);
846 for (j
= 0; j
< bh
; j
++) {
847 uint8_t *dst
= dst_row
+ (y
+ j
) * dst_stride
+ x
* comps
* comp_size
;
848 for (i
= 0; i
< bw
; i
++) {
849 etc2_r11_fetch_texel(&block
, i
, j
, dst
);
850 dst
+= comps
* comp_size
;
856 src_row
+= src_stride
;
861 etc2_unpack_rg11(uint8_t *dst_row
,
863 const uint8_t *src_row
,
868 /* If internalformat is COMPRESSED_RG11_EAC, each 4 × 4 block of
869 RG color information is compressed to 128 bits.
871 const unsigned bw
= 4, bh
= 4, bs
= 16, comps
= 2, comp_size
= 2;
872 struct etc2_block block
;
875 for (y
= 0; y
< height
; y
+= bh
) {
876 const uint8_t *src
= src_row
;
878 for (x
= 0; x
< width
; x
+= bw
) {
880 etc2_r11_parse_block(&block
, src
);
882 for (j
= 0; j
< bh
; j
++) {
883 uint8_t *dst
= dst_row
+ (y
+ j
) * dst_stride
+
884 x
* comps
* comp_size
;
885 for (i
= 0; i
< bw
; i
++) {
886 etc2_r11_fetch_texel(&block
, i
, j
, dst
);
887 dst
+= comps
* comp_size
;
890 /* green component */
891 etc2_r11_parse_block(&block
, src
+ 8);
893 for (j
= 0; j
< bh
; j
++) {
894 uint8_t *dst
= dst_row
+ (y
+ j
) * dst_stride
+
895 x
* comps
* comp_size
;
896 for (i
= 0; i
< bw
; i
++) {
897 etc2_r11_fetch_texel(&block
, i
, j
, dst
+ comp_size
);
898 dst
+= comps
* comp_size
;
904 src_row
+= src_stride
;
909 etc2_unpack_signed_r11(uint8_t *dst_row
,
911 const uint8_t *src_row
,
916 /* If internalformat is COMPRESSED_SIGNED_R11_EAC, each 4 × 4 block of
917 red color information is compressed to 64 bits.
919 const unsigned bw
= 4, bh
= 4, bs
= 8, comps
= 1, comp_size
= 2;
920 struct etc2_block block
;
923 for (y
= 0; y
< height
; y
+= bh
) {
924 const uint8_t *src
= src_row
;
926 for (x
= 0; x
< width
; x
+= bw
) {
927 etc2_r11_parse_block(&block
, src
);
929 for (j
= 0; j
< bh
; j
++) {
930 uint8_t *dst
= dst_row
+ (y
+ j
) * dst_stride
+
931 x
* comps
* comp_size
;
932 for (i
= 0; i
< bw
; i
++) {
933 etc2_signed_r11_fetch_texel(&block
, i
, j
, dst
);
934 dst
+= comps
* comp_size
;
940 src_row
+= src_stride
;
945 etc2_unpack_signed_rg11(uint8_t *dst_row
,
947 const uint8_t *src_row
,
952 /* If internalformat is COMPRESSED_SIGNED_RG11_EAC, each 4 × 4 block of
953 RG color information is compressed to 128 bits.
955 const unsigned bw
= 4, bh
= 4, bs
= 16, comps
= 2, comp_size
= 2;
956 struct etc2_block block
;
959 for (y
= 0; y
< height
; y
+= bh
) {
960 const uint8_t *src
= src_row
;
962 for (x
= 0; x
< width
; x
+= bw
) {
964 etc2_r11_parse_block(&block
, src
);
966 for (j
= 0; j
< bh
; j
++) {
967 uint8_t *dst
= dst_row
+ (y
+ j
) * dst_stride
+
968 x
* comps
* comp_size
;
969 for (i
= 0; i
< bw
; i
++) {
970 etc2_signed_r11_fetch_texel(&block
, i
, j
, dst
);
971 dst
+= comps
* comp_size
;
974 /* green component */
975 etc2_r11_parse_block(&block
, src
+ 8);
977 for (j
= 0; j
< bh
; j
++) {
978 uint8_t *dst
= dst_row
+ (y
+ j
) * dst_stride
+
979 x
* comps
* comp_size
;
980 for (i
= 0; i
< bw
; i
++) {
981 etc2_signed_r11_fetch_texel(&block
, i
, j
, dst
+ comp_size
);
982 dst
+= comps
* comp_size
;
988 src_row
+= src_stride
;
993 etc2_unpack_rgb8_punchthrough_alpha1(uint8_t *dst_row
,
995 const uint8_t *src_row
,
1000 const unsigned bw
= 4, bh
= 4, bs
= 8, comps
= 4;
1001 struct etc2_block block
;
1002 unsigned x
, y
, i
, j
;
1004 for (y
= 0; y
< height
; y
+= bh
) {
1005 const uint8_t *src
= src_row
;
1007 for (x
= 0; x
< width
; x
+= bw
) {
1008 etc2_rgb8_parse_block(&block
, src
,
1009 true /* punchthrough_alpha */);
1010 for (j
= 0; j
< bh
; j
++) {
1011 uint8_t *dst
= dst_row
+ (y
+ j
) * dst_stride
+ x
* comps
;
1012 for (i
= 0; i
< bw
; i
++) {
1013 etc2_rgb8_fetch_texel(&block
, i
, j
, dst
,
1014 true /* punchthrough_alpha */);
1022 src_row
+= src_stride
;
1027 etc2_unpack_srgb8_punchthrough_alpha1(uint8_t *dst_row
,
1028 unsigned dst_stride
,
1029 const uint8_t *src_row
,
1030 unsigned src_stride
,
1034 const unsigned bw
= 4, bh
= 4, bs
= 8, comps
= 4;
1035 struct etc2_block block
;
1036 unsigned x
, y
, i
, j
;
1039 for (y
= 0; y
< height
; y
+= bh
) {
1040 const uint8_t *src
= src_row
;
1042 for (x
= 0; x
< width
; x
+= bw
) {
1043 etc2_rgb8_parse_block(&block
, src
,
1044 true /* punchthrough_alpha */);
1045 for (j
= 0; j
< bh
; j
++) {
1046 uint8_t *dst
= dst_row
+ (y
+ j
) * dst_stride
+ x
* comps
;
1047 for (i
= 0; i
< bw
; i
++) {
1048 etc2_rgb8_fetch_texel(&block
, i
, j
, dst
,
1049 true /* punchthrough_alpha */);
1050 /* Convert to MESA_FORMAT_SARGB8 */
1063 src_row
+= src_stride
;
1067 /* ETC2 texture formats are valid in glCompressedTexImage2D and
1068 * glCompressedTexSubImage2D functions */
1070 _mesa_texstore_etc2_rgb8(TEXSTORE_PARAMS
)
1078 _mesa_texstore_etc2_srgb8(TEXSTORE_PARAMS
)
1086 _mesa_texstore_etc2_rgba8_eac(TEXSTORE_PARAMS
)
1094 _mesa_texstore_etc2_srgb8_alpha8_eac(TEXSTORE_PARAMS
)
1102 _mesa_texstore_etc2_r11_eac(TEXSTORE_PARAMS
)
1110 _mesa_texstore_etc2_signed_r11_eac(TEXSTORE_PARAMS
)
1118 _mesa_texstore_etc2_rg11_eac(TEXSTORE_PARAMS
)
1126 _mesa_texstore_etc2_signed_rg11_eac(TEXSTORE_PARAMS
)
1134 _mesa_texstore_etc2_rgb8_punchthrough_alpha1(TEXSTORE_PARAMS
)
1142 _mesa_texstore_etc2_srgb8_punchthrough_alpha1(TEXSTORE_PARAMS
)
1151 * Decode texture data in any one of following formats:
1152 * `MESA_FORMAT_ETC2_RGB8`
1153 * `MESA_FORMAT_ETC2_SRGB8`
1154 * `MESA_FORMAT_ETC2_RGBA8_EAC`
1155 * `MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC`
1156 * `MESA_FORMAT_ETC2_R11_EAC`
1157 * `MESA_FORMAT_ETC2_RG11_EAC`
1158 * `MESA_FORMAT_ETC2_SIGNED_R11_EAC`
1159 * `MESA_FORMAT_ETC2_SIGNED_RG11_EAC`
1160 * `MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1`
1161 * `MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1`
1163 * The size of the source data must be a multiple of the ETC2 block size
1164 * even if the texture image's dimensions are not aligned to 4.
1166 * \param src_width in pixels
1167 * \param src_height in pixels
1168 * \param dst_stride in bytes
1172 _mesa_unpack_etc2_format(uint8_t *dst_row
,
1173 unsigned dst_stride
,
1174 const uint8_t *src_row
,
1175 unsigned src_stride
,
1177 unsigned src_height
,
1180 if (format
== MESA_FORMAT_ETC2_RGB8
)
1181 etc2_unpack_rgb8(dst_row
, dst_stride
,
1182 src_row
, src_stride
,
1183 src_width
, src_height
);
1184 else if (format
== MESA_FORMAT_ETC2_SRGB8
)
1185 etc2_unpack_srgb8(dst_row
, dst_stride
,
1186 src_row
, src_stride
,
1187 src_width
, src_height
);
1188 else if (format
== MESA_FORMAT_ETC2_RGBA8_EAC
)
1189 etc2_unpack_rgba8(dst_row
, dst_stride
,
1190 src_row
, src_stride
,
1191 src_width
, src_height
);
1192 else if (format
== MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC
)
1193 etc2_unpack_srgb8_alpha8(dst_row
, dst_stride
,
1194 src_row
, src_stride
,
1195 src_width
, src_height
);
1196 else if (format
== MESA_FORMAT_ETC2_R11_EAC
)
1197 etc2_unpack_r11(dst_row
, dst_stride
,
1198 src_row
, src_stride
,
1199 src_width
, src_height
);
1200 else if (format
== MESA_FORMAT_ETC2_RG11_EAC
)
1201 etc2_unpack_rg11(dst_row
, dst_stride
,
1202 src_row
, src_stride
,
1203 src_width
, src_height
);
1204 else if (format
== MESA_FORMAT_ETC2_SIGNED_R11_EAC
)
1205 etc2_unpack_signed_r11(dst_row
, dst_stride
,
1206 src_row
, src_stride
,
1207 src_width
, src_height
);
1208 else if (format
== MESA_FORMAT_ETC2_SIGNED_RG11_EAC
)
1209 etc2_unpack_signed_rg11(dst_row
, dst_stride
,
1210 src_row
, src_stride
,
1211 src_width
, src_height
);
1212 else if (format
== MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1
)
1213 etc2_unpack_rgb8_punchthrough_alpha1(dst_row
, dst_stride
,
1214 src_row
, src_stride
,
1215 src_width
, src_height
);
1216 else if (format
== MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1
)
1217 etc2_unpack_srgb8_punchthrough_alpha1(dst_row
, dst_stride
,
1218 src_row
, src_stride
,
1219 src_width
, src_height
);
1225 fetch_etc1_rgb8(const GLubyte
*map
, const GLuint imageOffsets
[],
1226 GLint rowStride
, GLint i
, GLint j
, GLint k
,
1229 struct etc1_block block
;
1233 src
= map
+ (((rowStride
+ 3) / 4) * (j
/ 4) + (i
/ 4)) * 8;
1235 etc1_parse_block(&block
, src
);
1236 etc1_fetch_texel(&block
, i
% 4, j
% 4, dst
);
1238 texel
[RCOMP
] = UBYTE_TO_FLOAT(dst
[0]);
1239 texel
[GCOMP
] = UBYTE_TO_FLOAT(dst
[1]);
1240 texel
[BCOMP
] = UBYTE_TO_FLOAT(dst
[2]);
1241 texel
[ACOMP
] = 1.0f
;
1246 fetch_etc2_rgb8(const GLubyte
*map
, const GLuint imageOffsets
[],
1247 GLint rowStride
, GLint i
, GLint j
, GLint k
,
1250 struct etc2_block block
;
1254 src
= map
+ (((rowStride
+ 3) / 4) * (j
/ 4) + (i
/ 4)) * 8;
1256 etc2_rgb8_parse_block(&block
, src
,
1257 false /* punchthrough_alpha */);
1258 etc2_rgb8_fetch_texel(&block
, i
% 4, j
% 4, dst
,
1259 false /* punchthrough_alpha */);
1261 texel
[RCOMP
] = UBYTE_TO_FLOAT(dst
[0]);
1262 texel
[GCOMP
] = UBYTE_TO_FLOAT(dst
[1]);
1263 texel
[BCOMP
] = UBYTE_TO_FLOAT(dst
[2]);
1264 texel
[ACOMP
] = 1.0f
;
1268 fetch_etc2_srgb8(const GLubyte
*map
, const GLuint imageOffsets
[],
1269 GLint rowStride
, GLint i
, GLint j
, GLint k
,
1272 struct etc2_block block
;
1276 src
= map
+ (((rowStride
+ 3) / 4) * (j
/ 4) + (i
/ 4)) * 8;
1278 etc2_rgb8_parse_block(&block
, src
,
1279 false /* punchthrough_alpha */);
1280 etc2_rgb8_fetch_texel(&block
, i
% 4, j
% 4, dst
,
1281 false /* punchthrough_alpha */);
1283 texel
[RCOMP
] = _mesa_nonlinear_to_linear(dst
[0]);
1284 texel
[GCOMP
] = _mesa_nonlinear_to_linear(dst
[1]);
1285 texel
[BCOMP
] = _mesa_nonlinear_to_linear(dst
[2]);
1286 texel
[ACOMP
] = 1.0f
;
1290 fetch_etc2_rgba8_eac(const GLubyte
*map
, const GLuint imageOffsets
[],
1291 GLint rowStride
, GLint i
, GLint j
, GLint k
,
1294 struct etc2_block block
;
1298 src
= map
+ (((rowStride
+ 3) / 4) * (j
/ 4) + (i
/ 4)) * 16;
1300 etc2_rgba8_parse_block(&block
, src
);
1301 etc2_rgba8_fetch_texel(&block
, i
% 4, j
% 4, dst
);
1303 texel
[RCOMP
] = UBYTE_TO_FLOAT(dst
[0]);
1304 texel
[GCOMP
] = UBYTE_TO_FLOAT(dst
[1]);
1305 texel
[BCOMP
] = UBYTE_TO_FLOAT(dst
[2]);
1306 texel
[ACOMP
] = UBYTE_TO_FLOAT(dst
[3]);
1310 fetch_etc2_srgb8_alpha8_eac(const GLubyte
*map
, const GLuint imageOffsets
[],
1311 GLint rowStride
, GLint i
, GLint j
, GLint k
,
1314 struct etc2_block block
;
1318 src
= map
+ (((rowStride
+ 3) / 4) * (j
/ 4) + (i
/ 4)) * 16;
1320 etc2_rgba8_parse_block(&block
, src
);
1321 etc2_rgba8_fetch_texel(&block
, i
% 4, j
% 4, dst
);
1323 texel
[RCOMP
] = _mesa_nonlinear_to_linear(dst
[0]);
1324 texel
[GCOMP
] = _mesa_nonlinear_to_linear(dst
[1]);
1325 texel
[BCOMP
] = _mesa_nonlinear_to_linear(dst
[2]);
1326 texel
[ACOMP
] = UBYTE_TO_FLOAT(dst
[3]);
1330 fetch_etc2_r11_eac(const GLubyte
*map
, const GLuint imageOffsets
[],
1331 GLint rowStride
, GLint i
, GLint j
, GLint k
,
1334 struct etc2_block block
;
1338 src
= map
+ (((rowStride
+ 3) / 4) * (j
/ 4) + (i
/ 4)) * 8;
1340 etc2_r11_parse_block(&block
, src
);
1341 etc2_r11_fetch_texel(&block
, i
% 4, j
% 4, (uint8_t *)&dst
);
1343 texel
[RCOMP
] = USHORT_TO_FLOAT(dst
);
1344 texel
[GCOMP
] = 0.0f
;
1345 texel
[BCOMP
] = 0.0f
;
1346 texel
[ACOMP
] = 1.0f
;
1350 fetch_etc2_rg11_eac(const GLubyte
*map
, const GLuint imageOffsets
[],
1351 GLint rowStride
, GLint i
, GLint j
, GLint k
,
1354 struct etc2_block block
;
1358 src
= map
+ (((rowStride
+ 3) / 4) * (j
/ 4) + (i
/ 4)) * 16;
1361 etc2_r11_parse_block(&block
, src
);
1362 etc2_r11_fetch_texel(&block
, i
% 4, j
% 4, (uint8_t *)dst
);
1364 /* green component */
1365 etc2_r11_parse_block(&block
, src
+ 8);
1366 etc2_r11_fetch_texel(&block
, i
% 4, j
% 4, (uint8_t *)(dst
+ 1));
1368 texel
[RCOMP
] = USHORT_TO_FLOAT(dst
[0]);
1369 texel
[GCOMP
] = USHORT_TO_FLOAT(dst
[1]);
1370 texel
[BCOMP
] = 0.0f
;
1371 texel
[ACOMP
] = 1.0f
;
1375 fetch_etc2_signed_r11_eac(const GLubyte
*map
, const GLuint imageOffsets
[],
1376 GLint rowStride
, GLint i
, GLint j
, GLint k
,
1379 struct etc2_block block
;
1383 src
= map
+ (((rowStride
+ 3) / 4) * (j
/ 4) + (i
/ 4)) * 8;
1385 etc2_r11_parse_block(&block
, src
);
1386 etc2_signed_r11_fetch_texel(&block
, i
% 4, j
% 4, (uint8_t *)&dst
);
1388 texel
[RCOMP
] = SHORT_TO_FLOAT(dst
);
1389 texel
[GCOMP
] = 0.0f
;
1390 texel
[BCOMP
] = 0.0f
;
1391 texel
[ACOMP
] = 1.0f
;
1395 fetch_etc2_signed_rg11_eac(const GLubyte
*map
, const GLuint imageOffsets
[],
1396 GLint rowStride
, GLint i
, GLint j
, GLint k
,
1399 struct etc2_block block
;
1403 src
= map
+ (((rowStride
+ 3) / 4) * (j
/ 4) + (i
/ 4)) * 16;
1406 etc2_r11_parse_block(&block
, src
);
1407 etc2_signed_r11_fetch_texel(&block
, i
% 4, j
% 4, (uint8_t *)dst
);
1409 /* green component */
1410 etc2_r11_parse_block(&block
, src
+ 8);
1411 etc2_signed_r11_fetch_texel(&block
, i
% 4, j
% 4, (uint8_t *)(dst
+ 1));
1413 texel
[RCOMP
] = SHORT_TO_FLOAT(dst
[0]);
1414 texel
[GCOMP
] = SHORT_TO_FLOAT(dst
[1]);
1415 texel
[BCOMP
] = 0.0f
;
1416 texel
[ACOMP
] = 1.0f
;
1420 fetch_etc2_rgb8_punchthrough_alpha1(const GLubyte
*map
,
1421 const GLuint imageOffsets
[],
1422 GLint rowStride
, GLint i
, GLint j
, GLint k
,
1425 struct etc2_block block
;
1429 src
= map
+ (((rowStride
+ 3) / 4) * (j
/ 4) + (i
/ 4)) * 8;
1431 etc2_rgb8_parse_block(&block
, src
,
1432 true /* punchthrough alpha */);
1433 etc2_rgb8_fetch_texel(&block
, i
% 4, j
% 4, dst
,
1434 true /* punchthrough alpha */);
1435 texel
[RCOMP
] = UBYTE_TO_FLOAT(dst
[0]);
1436 texel
[GCOMP
] = UBYTE_TO_FLOAT(dst
[1]);
1437 texel
[BCOMP
] = UBYTE_TO_FLOAT(dst
[2]);
1438 texel
[ACOMP
] = UBYTE_TO_FLOAT(dst
[3]);
1442 fetch_etc2_srgb8_punchthrough_alpha1(const GLubyte
*map
,
1443 const GLuint imageOffsets
[],
1445 GLint i
, GLint j
, GLint k
,
1448 struct etc2_block block
;
1452 src
= map
+ (((rowStride
+ 3) / 4) * (j
/ 4) + (i
/ 4)) * 8;
1454 etc2_rgb8_parse_block(&block
, src
,
1455 true /* punchthrough alpha */);
1456 etc2_rgb8_fetch_texel(&block
, i
% 4, j
% 4, dst
,
1457 true /* punchthrough alpha */);
1458 texel
[RCOMP
] = _mesa_nonlinear_to_linear(dst
[0]);
1459 texel
[GCOMP
] = _mesa_nonlinear_to_linear(dst
[1]);
1460 texel
[BCOMP
] = _mesa_nonlinear_to_linear(dst
[2]);
1461 texel
[ACOMP
] = UBYTE_TO_FLOAT(dst
[3]);
1465 compressed_fetch_func
1466 _mesa_get_etc_fetch_func(gl_format format
)
1469 case MESA_FORMAT_ETC1_RGB8
:
1470 return fetch_etc1_rgb8
;
1471 case MESA_FORMAT_ETC2_RGB8
:
1472 return fetch_etc2_rgb8
;
1473 case MESA_FORMAT_ETC2_SRGB8
:
1474 return fetch_etc2_srgb8
;
1475 case MESA_FORMAT_ETC2_RGBA8_EAC
:
1476 return fetch_etc2_rgba8_eac
;
1477 case MESA_FORMAT_ETC2_SRGB8_ALPHA8_EAC
:
1478 return fetch_etc2_srgb8_alpha8_eac
;
1479 case MESA_FORMAT_ETC2_R11_EAC
:
1480 return fetch_etc2_r11_eac
;
1481 case MESA_FORMAT_ETC2_RG11_EAC
:
1482 return fetch_etc2_rg11_eac
;
1483 case MESA_FORMAT_ETC2_SIGNED_R11_EAC
:
1484 return fetch_etc2_signed_r11_eac
;
1485 case MESA_FORMAT_ETC2_SIGNED_RG11_EAC
:
1486 return fetch_etc2_signed_rg11_eac
;
1487 case MESA_FORMAT_ETC2_RGB8_PUNCHTHROUGH_ALPHA1
:
1488 return fetch_etc2_rgb8_punchthrough_alpha1
;
1489 case MESA_FORMAT_ETC2_SRGB8_PUNCHTHROUGH_ALPHA1
:
1490 return fetch_etc2_srgb8_punchthrough_alpha1
;