mesa: add header for share bptc decompress functions

Move shared bptc functions to texcompress_bptc_tmp.h:
* fetch_rgba_unorm_from_block
* fetch_rgb_float_from_block
* compress_rgba_unorm
* compress_rgb_float

Create decompress functions:
* decompress_rgba_unorm
* decompress_rgb_float

Functions will be reused in gallium/auxiliary code.

v2: Add block decompress function
v3: Move all shared code to header
    Suggested-by: Marek Olšák <[email protected]>

Signed-off-by: Denis Pauk <[email protected]>
CC: Marek Olšák <[email protected]>
Signed-off-by: Marek Olšák <[email protected]>

3 files changed, 1761 insertions, 1434 deletions

diff --git a/src/mesa/Makefile.sources b/src/mesa/Makefile.sources
index 00aba0a2f78..63f3734c322 100644
--- a/src/mesa/Makefile.sources
+++ b/src/mesa/Makefile.sources
@@ -216,6 +216,7 @@ MAIN_FILES = \
 	main/texcompress.c \
 	main/texcompress_bptc.c \
 	main/texcompress_bptc.h \
+	main/texcompress_bptc_tmp.h \
 	main/texcompress_cpal.c \
 	main/texcompress_cpal.h \
 	main/texcompress_etc.c \
diff --git a/src/mesa/main/texcompress_bptc.c b/src/mesa/main/texcompress_bptc.c
index fd37be97f36..46279f144ff 100644
--- a/src/mesa/main/texcompress_bptc.c
+++ b/src/mesa/main/texcompress_bptc.c
@@ -29,632 +29,38 @@
 #include <stdbool.h>
 #include "texcompress.h"
 #include "texcompress_bptc.h"
-#include "util/format_srgb.h"
-#include "util/half_float.h"
+#include "texcompress_bptc_tmp.h"
 #include "texstore.h"
-#include "macros.h"
 #include "image.h"
 #include "mtypes.h"
 
-#define BLOCK_SIZE 4
-#define N_PARTITIONS 64
-#define BLOCK_BYTES 16
-
-struct bptc_unorm_mode {
-   int n_subsets;
-   int n_partition_bits;
-   bool has_rotation_bits;
-   bool has_index_selection_bit;
-   int n_color_bits;
-   int n_alpha_bits;
-   bool has_endpoint_pbits;
-   bool has_shared_pbits;
-   int n_index_bits;
-   int n_secondary_index_bits;
-};
-
-struct bptc_float_bitfield {
-   int8_t endpoint;
-   uint8_t component;
-   uint8_t offset;
-   uint8_t n_bits;
-   bool reverse;
-};
-
-struct bptc_float_mode {
-   bool reserved;
-   bool transformed_endpoints;
-   int n_partition_bits;
-   int n_endpoint_bits;
-   int n_index_bits;
-   int n_delta_bits[3];
-   struct bptc_float_bitfield bitfields[24];
-};
-
-struct bit_writer {
-   uint8_t buf;
-   int pos;
-   uint8_t *dst;
-};
-
-static const struct bptc_unorm_mode
-bptc_unorm_modes[] = {
-   /* 0 */ { 3, 4, false, false, 4, 0, true,  false, 3, 0 },
-   /* 1 */ { 2, 6, false, false, 6, 0, false, true,  3, 0 },
-   /* 2 */ { 3, 6, false, false, 5, 0, false, false, 2, 0 },
-   /* 3 */ { 2, 6, false, false, 7, 0, true,  false, 2, 0 },
-   /* 4 */ { 1, 0, true,  true,  5, 6, false, false, 2, 3 },
-   /* 5 */ { 1, 0, true,  false, 7, 8, false, false, 2, 2 },
-   /* 6 */ { 1, 0, false, false, 7, 7, true,  false, 4, 0 },
-   /* 7 */ { 2, 6, false, false, 5, 5, true,  false, 2, 0 }
-};
-
-static const struct bptc_float_mode
-bptc_float_modes[] = {
-   /* 00 */
-   { false, true, 5, 10, 3, { 5, 5, 5 },
-     { { 2, 1, 4, 1, false }, { 2, 2, 4, 1, false }, { 3, 2, 4, 1, false },
-       { 0, 0, 0, 10, false }, { 0, 1, 0, 10, false }, { 0, 2, 0, 10, false },
-       { 1, 0, 0, 5, false }, { 3, 1, 4, 1, false }, { 2, 1, 0, 4, false },
-       { 1, 1, 0, 5, false }, { 3, 2, 0, 1, false }, { 3, 1, 0, 4, false },
-       { 1, 2, 0, 5, false }, { 3, 2, 1, 1, false }, { 2, 2, 0, 4, false },
-       { 2, 0, 0, 5, false }, { 3, 2, 2, 1, false }, { 3, 0, 0, 5, false },
-       { 3, 2, 3, 1, false },
-       { -1 } }
-   },
-   /* 01 */
-   { false, true, 5, 7, 3, { 6, 6, 6 },
-     { { 2, 1, 5, 1, false }, { 3, 1, 4, 1, false }, { 3, 1, 5, 1, false },
-       { 0, 0, 0, 7, false }, { 3, 2, 0, 1, false }, { 3, 2, 1, 1, false },
-       { 2, 2, 4, 1, false }, { 0, 1, 0, 7, false }, { 2, 2, 5, 1, false },
-       { 3, 2, 2, 1, false }, { 2, 1, 4, 1, false }, { 0, 2, 0, 7, false },
-       { 3, 2, 3, 1, false }, { 3, 2, 5, 1, false }, { 3, 2, 4, 1, false },
-       { 1, 0, 0, 6, false }, { 2, 1, 0, 4, false }, { 1, 1, 0, 6, false },
-       { 3, 1, 0, 4, false }, { 1, 2, 0, 6, false }, { 2, 2, 0, 4, false },
-       { 2, 0, 0, 6, false },
-       { 3, 0, 0, 6, false },
-       { -1 } }
-   },
-   /* 00010 */
-   { false, true, 5, 11, 3, { 5, 4, 4 },
-     { { 0, 0, 0, 10, false }, { 0, 1, 0, 10, false }, { 0, 2, 0, 10, false },
-       { 1, 0, 0, 5, false }, { 0, 0, 10, 1, false }, { 2, 1, 0, 4, false },
-       { 1, 1, 0, 4, false }, { 0, 1, 10, 1, false }, { 3, 2, 0, 1, false },
-       { 3, 1, 0, 4, false }, { 1, 2, 0, 4, false }, { 0, 2, 10, 1, false },
-       { 3, 2, 1, 1, false }, { 2, 2, 0, 4, false }, { 2, 0, 0, 5, false },
-       { 3, 2, 2, 1, false }, { 3, 0, 0, 5, false }, { 3, 2, 3, 1, false },
-       { -1 } }
-   },
-   /* 00011 */
-   { false, false, 0, 10, 4, { 10, 10, 10 },
-     { { 0, 0, 0, 10, false }, { 0, 1, 0, 10, false }, { 0, 2, 0, 10, false },
-       { 1, 0, 0, 10, false }, { 1, 1, 0, 10, false }, { 1, 2, 0, 10, false },
-       { -1 } }
-   },
-   /* 00110 */
-   { false, true, 5, 11, 3, { 4, 5, 4 },
-     { { 0, 0, 0, 10, false }, { 0, 1, 0, 10, false }, { 0, 2, 0, 10, false },
-       { 1, 0, 0, 4, false }, { 0, 0, 10, 1, false }, { 3, 1, 4, 1, false },
-       { 2, 1, 0, 4, false }, { 1, 1, 0, 5, false }, { 0, 1, 10, 1, false },
-       { 3, 1, 0, 4, false }, { 1, 2, 0, 4, false }, { 0, 2, 10, 1, false },
-       { 3, 2, 1, 1, false }, { 2, 2, 0, 4, false }, { 2, 0, 0, 4, false },
-       { 3, 2, 0, 1, false }, { 3, 2, 2, 1, false }, { 3, 0, 0, 4, false },
-       { 2, 1, 4, 1, false }, { 3, 2, 3, 1, false },
-       { -1 } }
-   },
-   /* 00111 */
-   { false, true, 0, 11, 4, { 9, 9, 9 },
-     { { 0, 0, 0, 10, false }, { 0, 1, 0, 10, false }, { 0, 2, 0, 10, false },
-       { 1, 0, 0, 9, false }, { 0, 0, 10, 1, false }, { 1, 1, 0, 9, false },
-       { 0, 1, 10, 1, false }, { 1, 2, 0, 9, false }, { 0, 2, 10, 1, false },
-       { -1 } }
-   },
-   /* 01010 */
-   { false, true, 5, 11, 3, { 4, 4, 5 },
-     { { 0, 0, 0, 10, false }, { 0, 1, 0, 10, false }, { 0, 2, 0, 10, false },
-       { 1, 0, 0, 4, false }, { 0, 0, 10, 1, false }, { 2, 2, 4, 1, false },
-       { 2, 1, 0, 4, false }, { 1, 1, 0, 4, false }, { 0, 1, 10, 1, false },
-       { 3, 2, 0, 1, false }, { 3, 1, 0, 4, false }, { 1, 2, 0, 5, false },
-       { 0, 2, 10, 1, false }, { 2, 2, 0, 4, false }, { 2, 0, 0, 4, false },
-       { 3, 2, 1, 1, false }, { 3, 2, 2, 1, false }, { 3, 0, 0, 4, false },
-       { 3, 2, 4, 1, false }, { 3, 2, 3, 1, false },
-       { -1 } }
-   },
-   /* 01011 */
-   { false, true, 0, 12, 4, { 8, 8, 8 },
-     { { 0, 0, 0, 10, false }, { 0, 1, 0, 10, false }, { 0, 2, 0, 10, false },
-       { 1, 0, 0, 8, false }, { 0, 0, 10, 2, true }, { 1, 1, 0, 8, false },
-       { 0, 1, 10, 2, true }, { 1, 2, 0, 8, false }, { 0, 2, 10, 2, true },
-       { -1 } }
-   },
-   /* 01110 */
-   { false, true, 5, 9, 3, { 5, 5, 5 },
-     { { 0, 0, 0, 9, false }, { 2, 2, 4, 1, false }, { 0, 1, 0, 9, false },
-       { 2, 1, 4, 1, false }, { 0, 2, 0, 9, false }, { 3, 2, 4, 1, false },
-       { 1, 0, 0, 5, false }, { 3, 1, 4, 1, false }, { 2, 1, 0, 4, false },
-       { 1, 1, 0, 5, false }, { 3, 2, 0, 1, false }, { 3, 1, 0, 4, false },
-       { 1, 2, 0, 5, false }, { 3, 2, 1, 1, false }, { 2, 2, 0, 4, false },
-       { 2, 0, 0, 5, false }, { 3, 2, 2, 1, false }, { 3, 0, 0, 5, false },
-       { 3, 2, 3, 1, false },
-       { -1 } }
-   },
-   /* 01111 */
-   { false, true, 0, 16, 4, { 4, 4, 4 },
-     { { 0, 0, 0, 10, false }, { 0, 1, 0, 10, false }, { 0, 2, 0, 10, false },
-       { 1, 0, 0, 4, false }, { 0, 0, 10, 6, true }, { 1, 1, 0, 4, false },
-       { 0, 1, 10, 6, true }, { 1, 2, 0, 4, false }, { 0, 2, 10, 6, true },
-       { -1 } }
-   },
-   /* 10010 */
-   { false, true, 5, 8, 3, { 6, 5, 5 },
-     { { 0, 0, 0, 8, false }, { 3, 1, 4, 1, false }, { 2, 2, 4, 1, false },
-       { 0, 1, 0, 8, false }, { 3, 2, 2, 1, false }, { 2, 1, 4, 1, false },
-       { 0, 2, 0, 8, false }, { 3, 2, 3, 1, false }, { 3, 2, 4, 1, false },
-       { 1, 0, 0, 6, false }, { 2, 1, 0, 4, false }, { 1, 1, 0, 5, false },
-       { 3, 2, 0, 1, false }, { 3, 1, 0, 4, false }, { 1, 2, 0, 5, false },
-       { 3, 2, 1, 1, false }, { 2, 2, 0, 4, false }, { 2, 0, 0, 6, false },
-       { 3, 0, 0, 6, false },
-       { -1 } }
-   },
-   /* 10011 */
-   { true /* reserved */ },
-   /* 10110 */
-   { false, true, 5, 8, 3, { 5, 6, 5 },
-     { { 0, 0, 0, 8, false }, { 3, 2, 0, 1, false }, { 2, 2, 4, 1, false },
-       { 0, 1, 0, 8, false }, { 2, 1, 5, 1, false }, { 2, 1, 4, 1, false },
-       { 0, 2, 0, 8, false }, { 3, 1, 5, 1, false }, { 3, 2, 4, 1, false },
-       { 1, 0, 0, 5, false }, { 3, 1, 4, 1, false }, { 2, 1, 0, 4, false },
-       { 1, 1, 0, 6, false }, { 3, 1, 0, 4, false }, { 1, 2, 0, 5, false },
-       { 3, 2, 1, 1, false }, { 2, 2, 0, 4, false }, { 2, 0, 0, 5, false },
-       { 3, 2, 2, 1, false }, { 3, 0, 0, 5, false }, { 3, 2, 3, 1, false },
-       { -1 } }
-   },
-   /* 10111 */
-   { true /* reserved */ },
-   /* 11010 */
-   { false, true, 5, 8, 3, { 5, 5, 6 },
-     { { 0, 0, 0, 8, false }, { 3, 2, 1, 1, false }, { 2, 2, 4, 1, false },
-       { 0, 1, 0, 8, false }, { 2, 2, 5, 1, false }, { 2, 1, 4, 1, false },
-       { 0, 2, 0, 8, false }, { 3, 2, 5, 1, false }, { 3, 2, 4, 1, false },
-       { 1, 0, 0, 5, false }, { 3, 1, 4, 1, false }, { 2, 1, 0, 4, false },
-       { 1, 1, 0, 5, false }, { 3, 2, 0, 1, false }, { 3, 1, 0, 4, false },
-       { 1, 2, 0, 6, false }, { 2, 2, 0, 4, false }, { 2, 0, 0, 5, false },
-       { 3, 2, 2, 1, false }, { 3, 0, 0, 5, false }, { 3, 2, 3, 1, false },
-       { -1 } }
-   },
-   /* 11011 */
-   { true /* reserved */ },
-   /* 11110 */
-   { false, false, 5, 6, 3, { 6, 6, 6 },
-     { { 0, 0, 0, 6, false }, { 3, 1, 4, 1, false }, { 3, 2, 0, 1, false },
-       { 3, 2, 1, 1, false }, { 2, 2, 4, 1, false }, { 0, 1, 0, 6, false },
-       { 2, 1, 5, 1, false }, { 2, 2, 5, 1, false }, { 3, 2, 2, 1, false },
-       { 2, 1, 4, 1, false }, { 0, 2, 0, 6, false }, { 3, 1, 5, 1, false },
-       { 3, 2, 3, 1, false }, { 3, 2, 5, 1, false }, { 3, 2, 4, 1, false },
-       { 1, 0, 0, 6, false }, { 2, 1, 0, 4, false }, { 1, 1, 0, 6, false },
-       { 3, 1, 0, 4, false }, { 1, 2, 0, 6, false }, { 2, 2, 0, 4, false },
-       { 2, 0, 0, 6, false }, { 3, 0, 0, 6, false },
-       { -1 } }
-   },
-   /* 11111 */
-   { true /* reserved */ },
-};
-
-/* This partition table is used when the mode has two subsets. Each
- * partition is represented by a 32-bit value which gives 2 bits per texel
- * within the block. The value of the two bits represents which subset to use
- * (0 or 1).
- */
-static const uint32_t
-partition_table1[N_PARTITIONS] = {
-   0x50505050U, 0x40404040U, 0x54545454U, 0x54505040U,
-   0x50404000U, 0x55545450U, 0x55545040U, 0x54504000U,
-   0x50400000U, 0x55555450U, 0x55544000U, 0x54400000U,
-   0x55555440U, 0x55550000U, 0x55555500U, 0x55000000U,
-   0x55150100U, 0x00004054U, 0x15010000U, 0x00405054U,
-   0x00004050U, 0x15050100U, 0x05010000U, 0x40505054U,
-   0x00404050U, 0x05010100U, 0x14141414U, 0x05141450U,
-   0x01155440U, 0x00555500U, 0x15014054U, 0x05414150U,
-   0x44444444U, 0x55005500U, 0x11441144U, 0x05055050U,
-   0x05500550U, 0x11114444U, 0x41144114U, 0x44111144U,
-   0x15055054U, 0x01055040U, 0x05041050U, 0x05455150U,
-   0x14414114U, 0x50050550U, 0x41411414U, 0x00141400U,
-   0x00041504U, 0x00105410U, 0x10541000U, 0x04150400U,
-   0x50410514U, 0x41051450U, 0x05415014U, 0x14054150U,
-   0x41050514U, 0x41505014U, 0x40011554U, 0x54150140U,
-   0x50505500U, 0x00555050U, 0x15151010U, 0x54540404U,
-};
-
-/* This partition table is used when the mode has three subsets. In this case
- * the values can be 0, 1 or 2.
- */
-static const uint32_t
-partition_table2[N_PARTITIONS] = {
-   0xaa685050U, 0x6a5a5040U, 0x5a5a4200U, 0x5450a0a8U,
-   0xa5a50000U, 0xa0a05050U, 0x5555a0a0U, 0x5a5a5050U,
-   0xaa550000U, 0xaa555500U, 0xaaaa5500U, 0x90909090U,
-   0x94949494U, 0xa4a4a4a4U, 0xa9a59450U, 0x2a0a4250U,
-   0xa5945040U, 0x0a425054U, 0xa5a5a500U, 0x55a0a0a0U,
-   0xa8a85454U, 0x6a6a4040U, 0xa4a45000U, 0x1a1a0500U,
-   0x0050a4a4U, 0xaaa59090U, 0x14696914U, 0x69691400U,
-   0xa08585a0U, 0xaa821414U, 0x50a4a450U, 0x6a5a0200U,
-   0xa9a58000U, 0x5090a0a8U, 0xa8a09050U, 0x24242424U,
-   0x00aa5500U, 0x24924924U, 0x24499224U, 0x50a50a50U,
-   0x500aa550U, 0xaaaa4444U, 0x66660000U, 0xa5a0a5a0U,
-   0x50a050a0U, 0x69286928U, 0x44aaaa44U, 0x66666600U,
-   0xaa444444U, 0x54a854a8U, 0x95809580U, 0x96969600U,
-   0xa85454a8U, 0x80959580U, 0xaa141414U, 0x96960000U,
-   0xaaaa1414U, 0xa05050a0U, 0xa0a5a5a0U, 0x96000000U,
-   0x40804080U, 0xa9a8a9a8U, 0xaaaaaa44U, 0x2a4a5254U
-};
-
-static const uint8_t
-anchor_indices[][N_PARTITIONS] = {
-   /* Anchor index values for the second subset of two-subset partitioning */
-   {
-      0xf,0xf,0xf,0xf,0xf,0xf,0xf,0xf,0xf,0xf,0xf,0xf,0xf,0xf,0xf,0xf,
-      0xf,0x2,0x8,0x2,0x2,0x8,0x8,0xf,0x2,0x8,0x2,0x2,0x8,0x8,0x2,0x2,
-      0xf,0xf,0x6,0x8,0x2,0x8,0xf,0xf,0x2,0x8,0x2,0x2,0x2,0xf,0xf,0x6,
-      0x6,0x2,0x6,0x8,0xf,0xf,0x2,0x2,0xf,0xf,0xf,0xf,0xf,0x2,0x2,0xf
-   },
-
-   /* Anchor index values for the second subset of three-subset partitioning */
-   {
-      0x3,0x3,0xf,0xf,0x8,0x3,0xf,0xf,0x8,0x8,0x6,0x6,0x6,0x5,0x3,0x3,
-      0x3,0x3,0x8,0xf,0x3,0x3,0x6,0xa,0x5,0x8,0x8,0x6,0x8,0x5,0xf,0xf,
-      0x8,0xf,0x3,0x5,0x6,0xa,0x8,0xf,0xf,0x3,0xf,0x5,0xf,0xf,0xf,0xf,
-      0x3,0xf,0x5,0x5,0x5,0x8,0x5,0xa,0x5,0xa,0x8,0xd,0xf,0xc,0x3,0x3
-   },
-
-   /* Anchor index values for the third subset of three-subset
-    * partitioning
-    */
-   {
-      0xf,0x8,0x8,0x3,0xf,0xf,0x3,0x8,0xf,0xf,0xf,0xf,0xf,0xf,0xf,0x8,
-      0xf,0x8,0xf,0x3,0xf,0x8,0xf,0x8,0x3,0xf,0x6,0xa,0xf,0xf,0xa,0x8,
-      0xf,0x3,0xf,0xa,0xa,0x8,0x9,0xa,0x6,0xf,0x8,0xf,0x3,0x6,0x6,0x8,
-      0xf,0x3,0xf,0xf,0xf,0xf,0xf,0xf,0xf,0xf,0xf,0xf,0x3,0xf,0xf,0x8
-   }
-};
-
-static int
-extract_bits(const uint8_t *block,
-             int offset,
-             int n_bits)
-{
-   int byte_index = offset / 8;
-   int bit_index = offset % 8;
-   int n_bits_in_byte = MIN2(n_bits, 8 - bit_index);
-   int result = 0;
-   int bit = 0;
-
-   while (true) {
-      result |= ((block[byte_index] >> bit_index) &
-                 ((1 << n_bits_in_byte) - 1)) << bit;
-
-      n_bits -= n_bits_in_byte;
-
-      if (n_bits <= 0)
-         return result;
-
-      bit += n_bits_in_byte;
-      byte_index++;
-      bit_index = 0;
-      n_bits_in_byte = MIN2(n_bits, 8);
-   }
-}
-
-static uint8_t
-expand_component(uint8_t byte,
-                 int n_bits)
-{
-   /* Expands a n-bit quantity into a byte by copying the most-significant
-    * bits into the unused least-significant bits.
-    */
-   return byte << (8 - n_bits) | (byte >> (2 * n_bits - 8));
-}
-
-static int
-extract_unorm_endpoints(const struct bptc_unorm_mode *mode,
-                        const uint8_t *block,
-                        int bit_offset,
-                        uint8_t endpoints[][4])
-{
-   int component;
-   int subset;
-   int endpoint;
-   int pbit;
-   int n_components;
-
-   /* Extract each color component */
-   for (component = 0; component < 3; component++) {
-      for (subset = 0; subset < mode->n_subsets; subset++) {
-         for (endpoint = 0; endpoint < 2; endpoint++) {
-            endpoints[subset * 2 + endpoint][component] =
-               extract_bits(block, bit_offset, mode->n_color_bits);
-            bit_offset += mode->n_color_bits;
-         }
-      }
-   }
-
-   /* Extract the alpha values */
-   if (mode->n_alpha_bits > 0) {
-      for (subset = 0; subset < mode->n_subsets; subset++) {
-         for (endpoint = 0; endpoint < 2; endpoint++) {
-            endpoints[subset * 2 + endpoint][3] =
-               extract_bits(block, bit_offset, mode->n_alpha_bits);
-            bit_offset += mode->n_alpha_bits;
-         }
-      }
-
-      n_components = 4;
-   } else {
-      for (subset = 0; subset < mode->n_subsets; subset++)
-         for (endpoint = 0; endpoint < 2; endpoint++)
-            endpoints[subset * 2 + endpoint][3] = 255;
-
-      n_components = 3;
-   }
-
-   /* Add in the p-bits */
-   if (mode->has_endpoint_pbits) {
-      for (subset = 0; subset < mode->n_subsets; subset++) {
-         for (endpoint = 0; endpoint < 2; endpoint++) {
-            pbit = extract_bits(block, bit_offset, 1);
-            bit_offset += 1;
-
-            for (component = 0; component < n_components; component++) {
-               endpoints[subset * 2 + endpoint][component] <<= 1;
-               endpoints[subset * 2 + endpoint][component] |= pbit;
-            }
-         }
-      }
-   } else if (mode->has_shared_pbits) {
-      for (subset = 0; subset < mode->n_subsets; subset++) {
-         pbit = extract_bits(block, bit_offset, 1);
-         bit_offset += 1;
-
-         for (endpoint = 0; endpoint < 2; endpoint++) {
-            for (component = 0; component < n_components; component++) {
-               endpoints[subset * 2 + endpoint][component] <<= 1;
-               endpoints[subset * 2 + endpoint][component] |= pbit;
-            }
-         }
-      }
-   }
-
-   /* Expand the n-bit values to a byte */
-   for (subset = 0; subset < mode->n_subsets; subset++) {
-      for (endpoint = 0; endpoint < 2; endpoint++) {
-         for (component = 0; component < 3; component++) {
-            endpoints[subset * 2 + endpoint][component] =
-               expand_component(endpoints[subset * 2 + endpoint][component],
-                                mode->n_color_bits +
-                                mode->has_endpoint_pbits +
-                                mode->has_shared_pbits);
-         }
-
-         if (mode->n_alpha_bits > 0) {
-            endpoints[subset * 2 + endpoint][3] =
-               expand_component(endpoints[subset * 2 + endpoint][3],
-                                mode->n_alpha_bits +
-                                mode->has_endpoint_pbits +
-                                mode->has_shared_pbits);
-         }
-      }
-   }
-
-   return bit_offset;
-}
-
-static bool
-is_anchor(int n_subsets,
-          int partition_num,
-          int texel)
-{
-   if (texel == 0)
-      return true;
-
-   switch (n_subsets) {
-   case 1:
-      return false;
-   case 2:
-      return anchor_indices[0][partition_num] == texel;
-   case 3:
-      return (anchor_indices[1][partition_num] == texel ||
-              anchor_indices[2][partition_num] == texel);
-   default:
-      assert(false);
-      return false;
-   }
-}
-
-static int
-count_anchors_before_texel(int n_subsets,
-                           int partition_num,
-                           int texel)
-{
-   int count = 1;
-
-   if (texel == 0)
-      return 0;
-
-   switch (n_subsets) {
-   case 1:
-      break;
-   case 2:
-      if (texel > anchor_indices[0][partition_num])
-         count++;
-      break;
-   case 3:
-      if (texel > anchor_indices[1][partition_num])
-         count++;
-      if (texel > anchor_indices[2][partition_num])
-         count++;
-      break;
-   default:
-      assert(false);
-      return 0;
-   }
-
-   return count;
-}
-
-static int32_t
-interpolate(int32_t a, int32_t b,
-            int index,
-            int index_bits)
+static void
+fetch_bptc_rgb_float(const GLubyte *map,
+                     GLint rowStride, GLint i, GLint j,
+                     GLfloat *texel,
+                     bool is_signed)
 {
-   static const uint8_t weights2[] = { 0, 21, 43, 64 };
-   static const uint8_t weights3[] = { 0, 9, 18, 27, 37, 46, 55, 64 };
-   static const uint8_t weights4[] =
-      { 0, 4, 9, 13, 17, 21, 26, 30, 34, 38, 43, 47, 51, 55, 60, 64 };
-   static const uint8_t *weights[] = {
-      NULL, NULL, weights2, weights3, weights4
-   };
-   int weight;
+   const GLubyte *block;
 
-   weight = weights[index_bits][index];
+   block = map + (((rowStride + 3) / 4) * (j / 4) + (i / 4)) * 16;
 
-   return ((64 - weight) * a + weight * b + 32) >> 6;
+   fetch_rgb_float_from_block(block, texel, (i % 4) + (j % 4) * 4, is_signed);
 }
 
 static void
-apply_rotation(int rotation,
-               uint8_t *result)
+fetch_bptc_rgb_signed_float(const GLubyte *map,
+                            GLint rowStride, GLint i, GLint j,
+                            GLfloat *texel)
 {
-   uint8_t t;
-
-   if (rotation == 0)
-      return;
-
-   rotation--;
-
-   t = result[rotation];
-   result[rotation] = result[3];
-   result[3] = t;
+   fetch_bptc_rgb_float(map, rowStride, i, j, texel, true);
 }
 
 static void
-fetch_rgba_unorm_from_block(const uint8_t *block,
-                            uint8_t *result,
-                            int texel)
+fetch_bptc_rgb_unsigned_float(const GLubyte *map,
+                              GLint rowStride, GLint i, GLint j,
+                              GLfloat *texel)
 {
-   int mode_num = ffs(block[0]);
-   const struct bptc_unorm_mode *mode;
-   int bit_offset, secondary_bit_offset;
-   int partition_num;
-   int subset_num;
-   int rotation;
-   int index_selection;
-   int index_bits;
-   int indices[2];
-   int index;
-   int anchors_before_texel;
-   bool anchor;
-   uint8_t endpoints[3 * 2][4];
-   uint32_t subsets;
-   int component;
-
-   if (mode_num == 0) {
-      /* According to the spec this mode is reserved and shouldn't be used. */
-      memset(result, 0, 3);
-      result[3] = 0xff;
-      return;
-   }
-
-   mode = bptc_unorm_modes + mode_num - 1;
-   bit_offset = mode_num;
-
-   partition_num = extract_bits(block, bit_offset, mode->n_partition_bits);
-   bit_offset += mode->n_partition_bits;
-
-   switch (mode->n_subsets) {
-   case 1:
-      subsets = 0;
-      break;
-   case 2:
-      subsets = partition_table1[partition_num];
-      break;
-   case 3:
-      subsets = partition_table2[partition_num];
-      break;
-   default:
-      assert(false);
-      return;
-   }
-
-   if (mode->has_rotation_bits) {
-      rotation = extract_bits(block, bit_offset, 2);
-      bit_offset += 2;
-   } else {
-      rotation = 0;
-   }
-
-   if (mode->has_index_selection_bit) {
-      index_selection = extract_bits(block, bit_offset, 1);
-      bit_offset++;
-   } else {
-      index_selection = 0;
-   }
-
-   bit_offset = extract_unorm_endpoints(mode, block, bit_offset, endpoints);
-
-   anchors_before_texel = count_anchors_before_texel(mode->n_subsets,
-                                                     partition_num, texel);
-
-   /* Calculate the offset to the secondary index */
-   secondary_bit_offset = (bit_offset +
-                           BLOCK_SIZE * BLOCK_SIZE * mode->n_index_bits -
-                           mode->n_subsets +
-                           mode->n_secondary_index_bits * texel -
-                           anchors_before_texel);
-
-   /* Calculate the offset to the primary index for this texel */
-   bit_offset += mode->n_index_bits * texel - anchors_before_texel;
-
-   subset_num = (subsets >> (texel * 2)) & 3;
-
-   anchor = is_anchor(mode->n_subsets, partition_num, texel);
-
-   index_bits = mode->n_index_bits;
-   if (anchor)
-      index_bits--;
-   indices[0] = extract_bits(block, bit_offset, index_bits);
-
-   if (mode->n_secondary_index_bits) {
-      index_bits = mode->n_secondary_index_bits;
-      if (anchor)
-         index_bits--;
-      indices[1] = extract_bits(block, secondary_bit_offset, index_bits);
-   }
-
-   index = indices[index_selection];
-   index_bits = (index_selection ?
-                 mode->n_secondary_index_bits :
-                 mode->n_index_bits);
-
-   for (component = 0; component < 3; component++)
-      result[component] = interpolate(endpoints[subset_num * 2][component],
-                                      endpoints[subset_num * 2 + 1][component],
-                                      index,
-                                      index_bits);
-
-   /* Alpha uses the opposite index from the color components */
-   if (mode->n_secondary_index_bits && !index_selection) {
-      index = indices[1];
-      index_bits = mode->n_secondary_index_bits;
-   } else {
-      index = indices[0];
-      index_bits = mode->n_index_bits;
-   }
-
-   result[3] = interpolate(endpoints[subset_num * 2][3],
-                           endpoints[subset_num * 2 + 1][3],
-                           index,
-                           index_bits);
-
-   apply_rotation(rotation, result);
+   fetch_bptc_rgb_float(map, rowStride, i, j, texel, false);
 }
 
 static void
@@ -699,257 +105,6 @@ fetch_bptc_srgb_alpha_unorm(const GLubyte *map,
    texel[ACOMP] = UBYTE_TO_FLOAT(texel_bytes[3]);
 }
 
-static int32_t
-sign_extend(int32_t value,
-            int n_bits)
-{
-   if ((value & (1 << (n_bits - 1)))) {
-      value |= (~(int32_t) 0) << n_bits;
-   }
-
-   return value;
-}
-
-static int
-signed_unquantize(int value, int n_endpoint_bits)
-{
-   bool sign;
-
-   if (n_endpoint_bits >= 16)
-      return value;
-
-   if (value == 0)
-      return 0;
-
-   sign = false;
-
-   if (value < 0) {
-      sign = true;
-      value = -value;
-   }
-
-   if (value >= (1 << (n_endpoint_bits - 1)) - 1)
-      value = 0x7fff;
-   else
-      value = ((value << 15) + 0x4000) >> (n_endpoint_bits - 1);
-
-   if (sign)
-      value = -value;
-
-   return value;
-}
-
-static int
-unsigned_unquantize(int value, int n_endpoint_bits)
-{
-   if (n_endpoint_bits >= 15)
-      return value;
-
-   if (value == 0)
-      return 0;
-
-   if (value == (1 << n_endpoint_bits) - 1)
-      return 0xffff;
-
-   return ((value << 15) + 0x4000) >> (n_endpoint_bits - 1);
-}
-
-static int
-extract_float_endpoints(const struct bptc_float_mode *mode,
-                        const uint8_t *block,
-                        int bit_offset,
-                        int32_t endpoints[][3],
-                        bool is_signed)
-{
-   const struct bptc_float_bitfield *bitfield;
-   int endpoint, component;
-   int n_endpoints;
-   int value;
-   int i;
-
-   if (mode->n_partition_bits)
-      n_endpoints = 4;
-   else
-      n_endpoints = 2;
-
-   memset(endpoints, 0, sizeof endpoints[0][0] * n_endpoints * 3);
-
-   for (bitfield = mode->bitfields; bitfield->endpoint != -1; bitfield++) {
-      value = extract_bits(block, bit_offset, bitfield->n_bits);
-      bit_offset += bitfield->n_bits;
-
-      if (bitfield->reverse) {
-         for (i = 0; i < bitfield->n_bits; i++) {
-            if (value & (1 << i))
-               endpoints[bitfield->endpoint][bitfield->component] |=
-                  1 << ((bitfield->n_bits - 1 - i) + bitfield->offset);
-         }
-      } else {
-         endpoints[bitfield->endpoint][bitfield->component] |=
-            value << bitfield->offset;
-      }
-   }
-
-   if (mode->transformed_endpoints) {
-      /* The endpoints are specified as signed offsets from e0 */
-      for (endpoint = 1; endpoint < n_endpoints; endpoint++) {
-         for (component = 0; component < 3; component++) {
-            value = sign_extend(endpoints[endpoint][component],
-                                mode->n_delta_bits[component]);
-            endpoints[endpoint][component] =
-               ((endpoints[0][component] + value) &
-                ((1 << mode->n_endpoint_bits) - 1));
-         }
-      }
-   }
-
-   if (is_signed) {
-      for (endpoint = 0; endpoint < n_endpoints; endpoint++) {
-         for (component = 0; component < 3; component++) {
-            value = sign_extend(endpoints[endpoint][component],
-                                mode->n_endpoint_bits);
-            endpoints[endpoint][component] =
-               signed_unquantize(value, mode->n_endpoint_bits);
-         }
-      }
-   } else {
-      for (endpoint = 0; endpoint < n_endpoints; endpoint++) {
-         for (component = 0; component < 3; component++) {
-            endpoints[endpoint][component] =
-               unsigned_unquantize(endpoints[endpoint][component],
-                                   mode->n_endpoint_bits);
-         }
-      }
-   }
-
-   return bit_offset;
-}
-
-static int32_t
-finish_unsigned_unquantize(int32_t value)
-{
-   return value * 31 / 64;
-}
-
-static int32_t
-finish_signed_unquantize(int32_t value)
-{
-   if (value < 0)
-      return (-value * 31 / 32) | 0x8000;
-   else
-      return value * 31 / 32;
-}
-
-static void
-fetch_rgb_float_from_block(const uint8_t *block,
-                           float *result,
-                           int texel,
-                           bool is_signed)
-{
-   int mode_num;
-   const struct bptc_float_mode *mode;
-   int bit_offset;
-   int partition_num;
-   int subset_num;
-   int index_bits;
-   int index;
-   int anchors_before_texel;
-   int32_t endpoints[2 * 2][3];
-   uint32_t subsets;
-   int n_subsets;
-   int component;
-   int32_t value;
-
-   if (block[0] & 0x2) {
-      mode_num = (((block[0] >> 1) & 0xe) | (block[0] & 1)) + 2;
-      bit_offset = 5;
-   } else {
-      mode_num = block[0] & 3;
-      bit_offset = 2;
-   }
-
-   mode = bptc_float_modes + mode_num;
-
-   if (mode->reserved) {
-      memset(result, 0, sizeof result[0] * 3);
-      result[3] = 1.0f;
-      return;
-   }
-
-   bit_offset = extract_float_endpoints(mode, block, bit_offset,
-                                        endpoints, is_signed);
-
-   if (mode->n_partition_bits) {
-      partition_num = extract_bits(block, bit_offset, mode->n_partition_bits);
-      bit_offset += mode->n_partition_bits;
-
-      subsets = partition_table1[partition_num];
-      n_subsets = 2;
-   } else {
-      partition_num = 0;
-      subsets = 0;
-      n_subsets = 1;
-   }
-
-   anchors_before_texel =
-      count_anchors_before_texel(n_subsets, partition_num, texel);
-
-   /* Calculate the offset to the primary index for this texel */
-   bit_offset += mode->n_index_bits * texel - anchors_before_texel;
-
-   subset_num = (subsets >> (texel * 2)) & 3;
-
-   index_bits = mode->n_index_bits;
-   if (is_anchor(n_subsets, partition_num, texel))
-      index_bits--;
-   index = extract_bits(block, bit_offset, index_bits);
-
-   for (component = 0; component < 3; component++) {
-      value = interpolate(endpoints[subset_num * 2][component],
-                          endpoints[subset_num * 2 + 1][component],
-                          index,
-                          mode->n_index_bits);
-
-      if (is_signed)
-         value = finish_signed_unquantize(value);
-      else
-         value = finish_unsigned_unquantize(value);
-
-      result[component] = _mesa_half_to_float(value);
-   }
-
-   result[3] = 1.0f;
-}
-
-static void
-fetch_bptc_rgb_float(const GLubyte *map,
-                     GLint rowStride, GLint i, GLint j,
-                     GLfloat *texel,
-                     bool is_signed)
-{
-   const GLubyte *block;
-
-   block = map + (((rowStride + 3) / 4) * (j / 4) + (i / 4)) * 16;
-
-   fetch_rgb_float_from_block(block, texel, (i % 4) + (j % 4) * 4, is_signed);
-}
-
-static void
-fetch_bptc_rgb_signed_float(const GLubyte *map,
-                            GLint rowStride, GLint i, GLint j,
-                            GLfloat *texel)
-{
-   fetch_bptc_rgb_float(map, rowStride, i, j, texel, true);
-}
-
-static void
-fetch_bptc_rgb_unsigned_float(const GLubyte *map,
-                              GLint rowStride, GLint i, GLint j,
-                              GLfloat *texel)
-{
-   fetch_bptc_rgb_float(map, rowStride, i, j, texel, false);
-}
-
 compressed_fetch_func
 _mesa_get_bptc_fetch_func(mesa_format format)
 {
@@ -967,312 +122,6 @@ _mesa_get_bptc_fetch_func(mesa_format format)
    }
 }
 
-static void
-write_bits(struct bit_writer *writer, int n_bits, int value)
-{
-   do {
-      if (n_bits + writer->pos >= 8) {
-         *(writer->dst++) = writer->buf | (value << writer->pos);
-         writer->buf = 0;
-         value >>= (8 - writer->pos);
-         n_bits -= (8 - writer->pos);
-         writer->pos = 0;
-      } else {
-         writer->buf |= value << writer->pos;
-         writer->pos += n_bits;
-         break;
-      }
-   } while (n_bits > 0);
-}
-
-static void
-get_average_luminance_alpha_unorm(int width, int height,
-                                  const uint8_t *src, int src_rowstride,
-                                  int *average_luminance, int *average_alpha)
-{
-   int luminance_sum = 0, alpha_sum = 0;
-   int y, x;
-
-   for (y = 0; y < height; y++) {
-      for (x = 0; x < width; x++) {
-         luminance_sum += src[0] + src[1] + src[2];
-         alpha_sum += src[3];
-         src += 4;
-      }
-      src += src_rowstride - width * 4;
-   }
-
-   *average_luminance = luminance_sum / (width * height);
-   *average_alpha = alpha_sum / (width * height);
-}
-
-static void
-get_rgba_endpoints_unorm(int width, int height,
-                         const uint8_t *src, int src_rowstride,
-                         int average_luminance, int average_alpha,
-                         uint8_t endpoints[][4])
-{
-   int endpoint_luminances[2];
-   int midpoint;
-   int sums[2][4];
-   int endpoint;
-   int luminance;
-   uint8_t temp[3];
-   const uint8_t *p = src;
-   int rgb_left_endpoint_count = 0;
-   int alpha_left_endpoint_count = 0;
-   int y, x, i;
-
-   memset(sums, 0, sizeof sums);
-
-   for (y = 0; y < height; y++) {
-      for (x = 0; x < width; x++) {
-         luminance = p[0] + p[1] + p[2];
-         if (luminance < average_luminance) {
-            endpoint = 0;
-            rgb_left_endpoint_count++;
-         } else {
-            endpoint = 1;
-         }
-         for (i = 0; i < 3; i++)
-            sums[endpoint][i] += p[i];
-
-         if (p[2] < average_alpha) {
-            endpoint = 0;
-            alpha_left_endpoint_count++;
-         } else {
-            endpoint = 1;
-         }
-         sums[endpoint][3] += p[3];
-
-         p += 4;
-      }
-
-      p += src_rowstride - width * 4;
-   }
-
-   if (rgb_left_endpoint_count == 0 ||
-       rgb_left_endpoint_count == width * height) {
-      for (i = 0; i < 3; i++)
-         endpoints[0][i] = endpoints[1][i] =
-            (sums[0][i] + sums[1][i]) / (width * height);
-   } else {
-      for (i = 0; i < 3; i++) {
-         endpoints[0][i] = sums[0][i] / rgb_left_endpoint_count;
-         endpoints[1][i] = (sums[1][i] /
-                            (width * height - rgb_left_endpoint_count));
-      }
-   }
-
-   if (alpha_left_endpoint_count == 0 ||
-       alpha_left_endpoint_count == width * height) {
-      endpoints[0][3] = endpoints[1][3] =
-         (sums[0][3] + sums[1][3]) / (width * height);
-   } else {
-         endpoints[0][3] = sums[0][3] / alpha_left_endpoint_count;
-         endpoints[1][3] = (sums[1][3] /
-                            (width * height - alpha_left_endpoint_count));
-   }
-
-   /* We may need to swap the endpoints to ensure the most-significant bit of
-    * the first index is zero */
-
-   for (endpoint = 0; endpoint < 2; endpoint++) {
-      endpoint_luminances[endpoint] =
-         endpoints[endpoint][0] +
-         endpoints[endpoint][1] +
-         endpoints[endpoint][2];
-   }
-   midpoint = (endpoint_luminances[0] + endpoint_luminances[1]) / 2;
-
-   if ((src[0] + src[1] + src[2] <= midpoint) !=
-       (endpoint_luminances[0] <= midpoint)) {
-      memcpy(temp, endpoints[0], 3);
-      memcpy(endpoints[0], endpoints[1], 3);
-      memcpy(endpoints[1], temp, 3);
-   }
-
-   /* Same for the alpha endpoints */
-
-   midpoint = (endpoints[0][3] + endpoints[1][3]) / 2;
-
-   if ((src[3] <= midpoint) != (endpoints[0][3] <= midpoint)) {
-      temp[0] = endpoints[0][3];
-      endpoints[0][3] = endpoints[1][3];
-      endpoints[1][3] = temp[0];
-   }
-}
-
-static void
-write_rgb_indices_unorm(struct bit_writer *writer,
-                        int src_width, int src_height,
-                        const uint8_t *src, int src_rowstride,
-                        uint8_t endpoints[][4])
-{
-   int luminance;
-   int endpoint_luminances[2];
-   int endpoint;
-   int index;
-   int y, x;
-
-   for (endpoint = 0; endpoint < 2; endpoint++) {
-      endpoint_luminances[endpoint] =
-         endpoints[endpoint][0] +
-         endpoints[endpoint][1] +
-         endpoints[endpoint][2];
-   }
-
-   /* If the endpoints have the same luminance then we'll just use index 0 for
-    * all of the texels */
-   if (endpoint_luminances[0] == endpoint_luminances[1]) {
-      write_bits(writer, BLOCK_SIZE * BLOCK_SIZE * 2 - 1, 0);
-      return;
-   }
-
-   for (y = 0; y < src_height; y++) {
-      for (x = 0; x < src_width; x++) {
-         luminance = src[0] + src[1] + src[2];
-
-         index = ((luminance - endpoint_luminances[0]) * 3 /
-                  (endpoint_luminances[1] - endpoint_luminances[0]));
-         if (index < 0)
-            index = 0;
-         else if (index > 3)
-            index = 3;
-
-         assert(x != 0 || y != 0 || index < 2);
-
-         write_bits(writer, (x == 0 && y == 0) ? 1 : 2, index);
-
-         src += 4;
-      }
-
-      /* Pad the indices out to the block size */
-      if (src_width < BLOCK_SIZE)
-         write_bits(writer, 2 * (BLOCK_SIZE - src_width), 0);
-
-      src += src_rowstride - src_width * 4;
-   }
-
-   /* Pad the indices out to the block size */
-   if (src_height < BLOCK_SIZE)
-      write_bits(writer, 2 * BLOCK_SIZE * (BLOCK_SIZE - src_height), 0);
-}
-
-static void
-write_alpha_indices_unorm(struct bit_writer *writer,
-                          int src_width, int src_height,
-                          const uint8_t *src, int src_rowstride,
-                          uint8_t endpoints[][4])
-{
-   int index;
-   int y, x;
-
-   /* If the endpoints have the same alpha then we'll just use index 0 for
-    * all of the texels */
-   if (endpoints[0][3] == endpoints[1][3]) {
-      write_bits(writer, BLOCK_SIZE * BLOCK_SIZE * 3 - 1, 0);
-      return;
-   }
-
-   for (y = 0; y < src_height; y++) {
-      for (x = 0; x < src_width; x++) {
-         index = (((int) src[3] - (int) endpoints[0][3]) * 7 /
-                  ((int) endpoints[1][3] - endpoints[0][3]));
-         if (index < 0)
-            index = 0;
-         else if (index > 7)
-            index = 7;
-
-         assert(x != 0 || y != 0 || index < 4);
-
-         /* The first index has one less bit */
-         write_bits(writer, (x == 0 && y == 0) ? 2 : 3, index);
-
-         src += 4;
-      }
-
-      /* Pad the indices out to the block size */
-      if (src_width < BLOCK_SIZE)
-         write_bits(writer, 3 * (BLOCK_SIZE - src_width), 0);
-
-      src += src_rowstride - src_width * 4;
-   }
-
-   /* Pad the indices out to the block size */
-   if (src_height < BLOCK_SIZE)
-      write_bits(writer, 3 * BLOCK_SIZE * (BLOCK_SIZE - src_height), 0);
-}
-
-static void
-compress_rgba_unorm_block(int src_width, int src_height,
-                          const uint8_t *src, int src_rowstride,
-                          uint8_t *dst)
-{
-   int average_luminance, average_alpha;
-   uint8_t endpoints[2][4];
-   struct bit_writer writer;
-   int component, endpoint;
-
-   get_average_luminance_alpha_unorm(src_width, src_height, src, src_rowstride,
-                                     &average_luminance, &average_alpha);
-   get_rgba_endpoints_unorm(src_width, src_height, src, src_rowstride,
-                            average_luminance, average_alpha,
-                            endpoints);
-
-   writer.dst = dst;
-   writer.pos = 0;
-   writer.buf = 0;
-
-   write_bits(&writer, 5, 0x10); /* mode 4 */
-   write_bits(&writer, 2, 0); /* rotation 0 */
-   write_bits(&writer, 1, 0); /* index selection bit */
-
-   /* Write the color endpoints */
-   for (component = 0; component < 3; component++)
-      for (endpoint = 0; endpoint < 2; endpoint++)
-         write_bits(&writer, 5, endpoints[endpoint][component] >> 3);
-
-   /* Write the alpha endpoints */
-   for (endpoint = 0; endpoint < 2; endpoint++)
-      write_bits(&writer, 6, endpoints[endpoint][3] >> 2);
-
-   write_rgb_indices_unorm(&writer,
-                           src_width, src_height,
-                           src, src_rowstride,
-                           endpoints);
-   write_alpha_indices_unorm(&writer,
-                             src_width, src_height,
-                             src, src_rowstride,
-                             endpoints);
-}
-
-static void
-compress_rgba_unorm(int width, int height,
-                    const uint8_t *src, int src_rowstride,
-                    uint8_t *dst, int dst_rowstride)
-{
-   int dst_row_diff;
-   int y, x;
-
-   if (dst_rowstride >= width * 4)
-      dst_row_diff = dst_rowstride - ((width + 3) & ~3) * 4;
-   else
-      dst_row_diff = 0;
-
-   for (y = 0; y < height; y += BLOCK_SIZE) {
-      for (x = 0; x < width; x += BLOCK_SIZE) {
-         compress_rgba_unorm_block(MIN2(width - x, BLOCK_SIZE),
-                                   MIN2(height - y, BLOCK_SIZE),
-                                   src + x * 4 + y * src_rowstride,
-                                   src_rowstride,
-                                   dst);
-         dst += BLOCK_BYTES;
-      }
-      dst += dst_row_diff;
-   }
-}
-
 GLboolean
 _mesa_texstore_bptc_rgba_unorm(TEXSTORE_PARAMS)
 {
@@ -1318,272 +167,6 @@ _mesa_texstore_bptc_rgba_unorm(TEXSTORE_PARAMS)
    return GL_TRUE;
 }
 
-static float
-get_average_luminance_float(int width, int height,
-                            const float *src, int src_rowstride)
-{
-   float luminance_sum = 0;
-   int y, x;
-
-   for (y = 0; y < height; y++) {
-      for (x = 0; x < width; x++) {
-         luminance_sum += src[0] + src[1] + src[2];
-         src += 3;
-      }
-      src += (src_rowstride - width * 3 * sizeof (float)) / sizeof (float);
-   }
-
-   return luminance_sum / (width * height);
-}
-
-static float
-clamp_value(float value, bool is_signed)
-{
-   if (value > 65504.0f)
-      return 65504.0f;
-
-   if (is_signed) {
-      if (value < -65504.0f)
-         return -65504.0f;
-      else
-         return value;
-   }
-
-   if (value < 0.0f)
-      return 0.0f;
-
-   return value;
-}
-
-static void
-get_endpoints_float(int width, int height,
-                    const float *src, int src_rowstride,
-                    float average_luminance, float endpoints[][3],
-                    bool is_signed)
-{
-   float endpoint_luminances[2];
-   float midpoint;
-   float sums[2][3];
-   int endpoint, component;
-   float luminance;
-   float temp[3];
-   const float *p = src;
-   int left_endpoint_count = 0;
-   int y, x, i;
-
-   memset(sums, 0, sizeof sums);
-
-   for (y = 0; y < height; y++) {
-      for (x = 0; x < width; x++) {
-         luminance = p[0] + p[1] + p[2];
-         if (luminance < average_luminance) {
-            endpoint = 0;
-            left_endpoint_count++;
-         } else {
-            endpoint = 1;
-         }
-         for (i = 0; i < 3; i++)
-            sums[endpoint][i] += p[i];
-
-         p += 3;
-      }
-
-      p += (src_rowstride - width * 3 * sizeof (float)) / sizeof (float);
-   }
-
-   if (left_endpoint_count == 0 ||
-       left_endpoint_count == width * height) {
-      for (i = 0; i < 3; i++)
-         endpoints[0][i] = endpoints[1][i] =
-            (sums[0][i] + sums[1][i]) / (width * height);
-   } else {
-      for (i = 0; i < 3; i++) {
-         endpoints[0][i] = sums[0][i] / left_endpoint_count;
-         endpoints[1][i] = sums[1][i] / (width * height - left_endpoint_count);
-      }
-   }
-
-   /* Clamp the endpoints to the range of a half float and strip out
-    * infinities */
-   for (endpoint = 0; endpoint < 2; endpoint++) {
-      for (component = 0; component < 3; component++) {
-         endpoints[endpoint][component] =
-            clamp_value(endpoints[endpoint][component], is_signed);
-      }
-   }
-
-   /* We may need to swap the endpoints to ensure the most-significant bit of
-    * the first index is zero */
-
-   for (endpoint = 0; endpoint < 2; endpoint++) {
-      endpoint_luminances[endpoint] =
-         endpoints[endpoint][0] +
-         endpoints[endpoint][1] +
-         endpoints[endpoint][2];
-   }
-   midpoint = (endpoint_luminances[0] + endpoint_luminances[1]) / 2.0f;
-
-   if ((src[0] + src[1] + src[2] <= midpoint) !=
-       (endpoint_luminances[0] <= midpoint)) {
-      memcpy(temp, endpoints[0], sizeof temp);
-      memcpy(endpoints[0], endpoints[1], sizeof temp);
-      memcpy(endpoints[1], temp, sizeof temp);
-   }
-}
-
-static void
-write_rgb_indices_float(struct bit_writer *writer,
-                        int src_width, int src_height,
-                        const float *src, int src_rowstride,
-                        float endpoints[][3])
-{
-   float luminance;
-   float endpoint_luminances[2];
-   int endpoint;
-   int index;
-   int y, x;
-
-   for (endpoint = 0; endpoint < 2; endpoint++) {
-      endpoint_luminances[endpoint] =
-         endpoints[endpoint][0] +
-         endpoints[endpoint][1] +
-         endpoints[endpoint][2];
-   }
-
-   /* If the endpoints have the same luminance then we'll just use index 0 for
-    * all of the texels */
-   if (endpoint_luminances[0] == endpoint_luminances[1]) {
-      write_bits(writer, BLOCK_SIZE * BLOCK_SIZE * 4 - 1, 0);
-      return;
-   }
-
-   for (y = 0; y < src_height; y++) {
-      for (x = 0; x < src_width; x++) {
-         luminance = src[0] + src[1] + src[2];
-
-         index = ((luminance - endpoint_luminances[0]) * 15 /
-                  (endpoint_luminances[1] - endpoint_luminances[0]));
-         if (index < 0)
-            index = 0;
-         else if (index > 15)
-            index = 15;
-
-         assert(x != 0 || y != 0 || index < 8);
-
-         write_bits(writer, (x == 0 && y == 0) ? 3 : 4, index);
-
-         src += 3;
-      }
-
-      /* Pad the indices out to the block size */
-      if (src_width < BLOCK_SIZE)
-         write_bits(writer, 4 * (BLOCK_SIZE - src_width), 0);
-
-      src += (src_rowstride - src_width * 3 * sizeof (float)) / sizeof (float);
-   }
-
-   /* Pad the indices out to the block size */
-   if (src_height < BLOCK_SIZE)
-      write_bits(writer, 4 * BLOCK_SIZE * (BLOCK_SIZE - src_height), 0);
-}
-
-static int
-get_endpoint_value(float value, bool is_signed)
-{
-   bool sign = false;
-   int half;
-
-   if (is_signed) {
-      half = _mesa_float_to_half(value);
-
-      if (half & 0x8000) {
-         half &= 0x7fff;
-         sign = true;
-      }
-
-      half = (32 * half / 31) >> 6;
-
-      if (sign)
-         half = -half & ((1 << 10) - 1);
-
-      return half;
-   } else {
-      if (value <= 0.0f)
-         return 0;
-
-      half = _mesa_float_to_half(value);
-
-      return (64 * half / 31) >> 6;
-   }
-}
-
-static void
-compress_rgb_float_block(int src_width, int src_height,
-                         const float *src, int src_rowstride,
-                         uint8_t *dst,
-                         bool is_signed)
-{
-   float average_luminance;
-   float endpoints[2][3];
-   struct bit_writer writer;
-   int component, endpoint;
-   int endpoint_value;
-
-   average_luminance =
-      get_average_luminance_float(src_width, src_height, src, src_rowstride);
-   get_endpoints_float(src_width, src_height, src, src_rowstride,
-                       average_luminance, endpoints, is_signed);
-
-   writer.dst = dst;
-   writer.pos = 0;
-   writer.buf = 0;
-
-   write_bits(&writer, 5, 3); /* mode 3 */
-
-   /* Write the endpoints */
-   for (endpoint = 0; endpoint < 2; endpoint++) {
-      for (component = 0; component < 3; component++) {
-         endpoint_value =
-            get_endpoint_value(endpoints[endpoint][component], is_signed);
-         write_bits(&writer, 10, endpoint_value);
-      }
-   }
-
-   write_rgb_indices_float(&writer,
-                           src_width, src_height,
-                           src, src_rowstride,
-                           endpoints);
-}
-
-static void
-compress_rgb_float(int width, int height,
-                   const float *src, int src_rowstride,
-                   uint8_t *dst, int dst_rowstride,
-                   bool is_signed)
-{
-   int dst_row_diff;
-   int y, x;
-
-   if (dst_rowstride >= width * 4)
-      dst_row_diff = dst_rowstride - ((width + 3) & ~3) * 4;
-   else
-      dst_row_diff = 0;
-
-   for (y = 0; y < height; y += BLOCK_SIZE) {
-      for (x = 0; x < width; x += BLOCK_SIZE) {
-         compress_rgb_float_block(MIN2(width - x, BLOCK_SIZE),
-                                  MIN2(height - y, BLOCK_SIZE),
-                                  src + x * 3 +
-                                  y * src_rowstride / sizeof (float),
-                                  src_rowstride,
-                                  dst,
-                                  is_signed);
-         dst += BLOCK_BYTES;
-      }
-      dst += dst_row_diff;
-   }
-}
-
 static GLboolean
 texstore_bptc_rgb_float(TEXSTORE_PARAMS,
                         bool is_signed)
diff --git a/src/mesa/main/texcompress_bptc_tmp.h b/src/mesa/main/texcompress_bptc_tmp.h
new file mode 100644
index 00000000000..3c4ea2c0131
--- /dev/null
+++ b/src/mesa/main/texcompress_bptc_tmp.h
@@ -0,0 +1,1743 @@
+/*
+ * Copyright (C) 2014 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+/*
+ * Included by texcompress_bptc and gallium to define BPTC decoding routines.
+ */
+
+#include "util/format_srgb.h"
+#include "util/half_float.h"
+#include "macros.h"
+
+#define BLOCK_SIZE 4
+#define N_PARTITIONS 64
+#define BLOCK_BYTES 16
+
+struct bptc_unorm_mode {
+   int n_subsets;
+   int n_partition_bits;
+   bool has_rotation_bits;
+   bool has_index_selection_bit;
+   int n_color_bits;
+   int n_alpha_bits;
+   bool has_endpoint_pbits;
+   bool has_shared_pbits;
+   int n_index_bits;
+   int n_secondary_index_bits;
+};
+
+struct bptc_float_bitfield {
+   int8_t endpoint;
+   uint8_t component;
+   uint8_t offset;
+   uint8_t n_bits;
+   bool reverse;
+};
+
+struct bptc_float_mode {
+   bool reserved;
+   bool transformed_endpoints;
+   int n_partition_bits;
+   int n_endpoint_bits;
+   int n_index_bits;
+   int n_delta_bits[3];
+   struct bptc_float_bitfield bitfields[24];
+};
+
+struct bit_writer {
+   uint8_t buf;
+   int pos;
+   uint8_t *dst;
+};
+
+static const struct bptc_unorm_mode
+bptc_unorm_modes[] = {
+   /* 0 */ { 3, 4, false, false, 4, 0, true,  false, 3, 0 },
+   /* 1 */ { 2, 6, false, false, 6, 0, false, true,  3, 0 },
+   /* 2 */ { 3, 6, false, false, 5, 0, false, false, 2, 0 },
+   /* 3 */ { 2, 6, false, false, 7, 0, true,  false, 2, 0 },
+   /* 4 */ { 1, 0, true,  true,  5, 6, false, false, 2, 3 },
+   /* 5 */ { 1, 0, true,  false, 7, 8, false, false, 2, 2 },
+   /* 6 */ { 1, 0, false, false, 7, 7, true,  false, 4, 0 },
+   /* 7 */ { 2, 6, false, false, 5, 5, true,  false, 2, 0 }
+};
+
+static const struct bptc_float_mode
+bptc_float_modes[] = {
+   /* 00 */
+   { false, true, 5, 10, 3, { 5, 5, 5 },
+     { { 2, 1, 4, 1, false }, { 2, 2, 4, 1, false }, { 3, 2, 4, 1, false },
+       { 0, 0, 0, 10, false }, { 0, 1, 0, 10, false }, { 0, 2, 0, 10, false },
+       { 1, 0, 0, 5, false }, { 3, 1, 4, 1, false }, { 2, 1, 0, 4, false },
+       { 1, 1, 0, 5, false }, { 3, 2, 0, 1, false }, { 3, 1, 0, 4, false },
+       { 1, 2, 0, 5, false }, { 3, 2, 1, 1, false }, { 2, 2, 0, 4, false },
+       { 2, 0, 0, 5, false }, { 3, 2, 2, 1, false }, { 3, 0, 0, 5, false },
+       { 3, 2, 3, 1, false },
+       { -1 } }
+   },
+   /* 01 */
+   { false, true, 5, 7, 3, { 6, 6, 6 },
+     { { 2, 1, 5, 1, false }, { 3, 1, 4, 1, false }, { 3, 1, 5, 1, false },
+       { 0, 0, 0, 7, false }, { 3, 2, 0, 1, false }, { 3, 2, 1, 1, false },
+       { 2, 2, 4, 1, false }, { 0, 1, 0, 7, false }, { 2, 2, 5, 1, false },
+       { 3, 2, 2, 1, false }, { 2, 1, 4, 1, false }, { 0, 2, 0, 7, false },
+       { 3, 2, 3, 1, false }, { 3, 2, 5, 1, false }, { 3, 2, 4, 1, false },
+       { 1, 0, 0, 6, false }, { 2, 1, 0, 4, false }, { 1, 1, 0, 6, false },
+       { 3, 1, 0, 4, false }, { 1, 2, 0, 6, false }, { 2, 2, 0, 4, false },
+       { 2, 0, 0, 6, false },
+       { 3, 0, 0, 6, false },
+       { -1 } }
+   },
+   /* 00010 */
+   { false, true, 5, 11, 3, { 5, 4, 4 },
+     { { 0, 0, 0, 10, false }, { 0, 1, 0, 10, false }, { 0, 2, 0, 10, false },
+       { 1, 0, 0, 5, false }, { 0, 0, 10, 1, false }, { 2, 1, 0, 4, false },
+       { 1, 1, 0, 4, false }, { 0, 1, 10, 1, false }, { 3, 2, 0, 1, false },
+       { 3, 1, 0, 4, false }, { 1, 2, 0, 4, false }, { 0, 2, 10, 1, false },
+       { 3, 2, 1, 1, false }, { 2, 2, 0, 4, false }, { 2, 0, 0, 5, false },
+       { 3, 2, 2, 1, false }, { 3, 0, 0, 5, false }, { 3, 2, 3, 1, false },
+       { -1 } }
+   },
+   /* 00011 */
+   { false, false, 0, 10, 4, { 10, 10, 10 },
+     { { 0, 0, 0, 10, false }, { 0, 1, 0, 10, false }, { 0, 2, 0, 10, false },
+       { 1, 0, 0, 10, false }, { 1, 1, 0, 10, false }, { 1, 2, 0, 10, false },
+       { -1 } }
+   },
+   /* 00110 */
+   { false, true, 5, 11, 3, { 4, 5, 4 },
+     { { 0, 0, 0, 10, false }, { 0, 1, 0, 10, false }, { 0, 2, 0, 10, false },
+       { 1, 0, 0, 4, false }, { 0, 0, 10, 1, false }, { 3, 1, 4, 1, false },
+       { 2, 1, 0, 4, false }, { 1, 1, 0, 5, false }, { 0, 1, 10, 1, false },
+       { 3, 1, 0, 4, false }, { 1, 2, 0, 4, false }, { 0, 2, 10, 1, false },
+       { 3, 2, 1, 1, false }, { 2, 2, 0, 4, false }, { 2, 0, 0, 4, false },
+       { 3, 2, 0, 1, false }, { 3, 2, 2, 1, false }, { 3, 0, 0, 4, false },
+       { 2, 1, 4, 1, false }, { 3, 2, 3, 1, false },
+       { -1 } }
+   },
+   /* 00111 */
+   { false, true, 0, 11, 4, { 9, 9, 9 },
+     { { 0, 0, 0, 10, false }, { 0, 1, 0, 10, false }, { 0, 2, 0, 10, false },
+       { 1, 0, 0, 9, false }, { 0, 0, 10, 1, false }, { 1, 1, 0, 9, false },
+       { 0, 1, 10, 1, false }, { 1, 2, 0, 9, false }, { 0, 2, 10, 1, false },
+       { -1 } }
+   },
+   /* 01010 */
+   { false, true, 5, 11, 3, { 4, 4, 5 },
+     { { 0, 0, 0, 10, false }, { 0, 1, 0, 10, false }, { 0, 2, 0, 10, false },
+       { 1, 0, 0, 4, false }, { 0, 0, 10, 1, false }, { 2, 2, 4, 1, false },
+       { 2, 1, 0, 4, false }, { 1, 1, 0, 4, false }, { 0, 1, 10, 1, false },
+       { 3, 2, 0, 1, false }, { 3, 1, 0, 4, false }, { 1, 2, 0, 5, false },
+       { 0, 2, 10, 1, false }, { 2, 2, 0, 4, false }, { 2, 0, 0, 4, false },
+       { 3, 2, 1, 1, false }, { 3, 2, 2, 1, false }, { 3, 0, 0, 4, false },
+       { 3, 2, 4, 1, false }, { 3, 2, 3, 1, false },
+       { -1 } }
+   },
+   /* 01011 */
+   { false, true, 0, 12, 4, { 8, 8, 8 },
+     { { 0, 0, 0, 10, false }, { 0, 1, 0, 10, false }, { 0, 2, 0, 10, false },
+       { 1, 0, 0, 8, false }, { 0, 0, 10, 2, true }, { 1, 1, 0, 8, false },
+       { 0, 1, 10, 2, true }, { 1, 2, 0, 8, false }, { 0, 2, 10, 2, true },
+       { -1 } }
+   },
+   /* 01110 */
+   { false, true, 5, 9, 3, { 5, 5, 5 },
+     { { 0, 0, 0, 9, false }, { 2, 2, 4, 1, false }, { 0, 1, 0, 9, false },
+       { 2, 1, 4, 1, false }, { 0, 2, 0, 9, false }, { 3, 2, 4, 1, false },
+       { 1, 0, 0, 5, false }, { 3, 1, 4, 1, false }, { 2, 1, 0, 4, false },
+       { 1, 1, 0, 5, false }, { 3, 2, 0, 1, false }, { 3, 1, 0, 4, false },
+       { 1, 2, 0, 5, false }, { 3, 2, 1, 1, false }, { 2, 2, 0, 4, false },
+       { 2, 0, 0, 5, false }, { 3, 2, 2, 1, false }, { 3, 0, 0, 5, false },
+       { 3, 2, 3, 1, false },
+       { -1 } }
+   },
+   /* 01111 */
+   { false, true, 0, 16, 4, { 4, 4, 4 },
+     { { 0, 0, 0, 10, false }, { 0, 1, 0, 10, false }, { 0, 2, 0, 10, false },
+       { 1, 0, 0, 4, false }, { 0, 0, 10, 6, true }, { 1, 1, 0, 4, false },
+       { 0, 1, 10, 6, true }, { 1, 2, 0, 4, false }, { 0, 2, 10, 6, true },
+       { -1 } }
+   },
+   /* 10010 */
+   { false, true, 5, 8, 3, { 6, 5, 5 },
+     { { 0, 0, 0, 8, false }, { 3, 1, 4, 1, false }, { 2, 2, 4, 1, false },
+       { 0, 1, 0, 8, false }, { 3, 2, 2, 1, false }, { 2, 1, 4, 1, false },
+       { 0, 2, 0, 8, false }, { 3, 2, 3, 1, false }, { 3, 2, 4, 1, false },
+       { 1, 0, 0, 6, false }, { 2, 1, 0, 4, false }, { 1, 1, 0, 5, false },
+       { 3, 2, 0, 1, false }, { 3, 1, 0, 4, false }, { 1, 2, 0, 5, false },
+       { 3, 2, 1, 1, false }, { 2, 2, 0, 4, false }, { 2, 0, 0, 6, false },
+       { 3, 0, 0, 6, false },
+       { -1 } }
+   },
+   /* 10011 */
+   { true /* reserved */ },
+   /* 10110 */
+   { false, true, 5, 8, 3, { 5, 6, 5 },
+     { { 0, 0, 0, 8, false }, { 3, 2, 0, 1, false }, { 2, 2, 4, 1, false },
+       { 0, 1, 0, 8, false }, { 2, 1, 5, 1, false }, { 2, 1, 4, 1, false },
+       { 0, 2, 0, 8, false }, { 3, 1, 5, 1, false }, { 3, 2, 4, 1, false },
+       { 1, 0, 0, 5, false }, { 3, 1, 4, 1, false }, { 2, 1, 0, 4, false },
+       { 1, 1, 0, 6, false }, { 3, 1, 0, 4, false }, { 1, 2, 0, 5, false },
+       { 3, 2, 1, 1, false }, { 2, 2, 0, 4, false }, { 2, 0, 0, 5, false },
+       { 3, 2, 2, 1, false }, { 3, 0, 0, 5, false }, { 3, 2, 3, 1, false },
+       { -1 } }
+   },
+   /* 10111 */
+   { true /* reserved */ },
+   /* 11010 */
+   { false, true, 5, 8, 3, { 5, 5, 6 },
+     { { 0, 0, 0, 8, false }, { 3, 2, 1, 1, false }, { 2, 2, 4, 1, false },
+       { 0, 1, 0, 8, false }, { 2, 2, 5, 1, false }, { 2, 1, 4, 1, false },
+       { 0, 2, 0, 8, false }, { 3, 2, 5, 1, false }, { 3, 2, 4, 1, false },
+       { 1, 0, 0, 5, false }, { 3, 1, 4, 1, false }, { 2, 1, 0, 4, false },
+       { 1, 1, 0, 5, false }, { 3, 2, 0, 1, false }, { 3, 1, 0, 4, false },
+       { 1, 2, 0, 6, false }, { 2, 2, 0, 4, false }, { 2, 0, 0, 5, false },
+       { 3, 2, 2, 1, false }, { 3, 0, 0, 5, false }, { 3, 2, 3, 1, false },
+       { -1 } }
+   },
+   /* 11011 */
+   { true /* reserved */ },
+   /* 11110 */
+   { false, false, 5, 6, 3, { 6, 6, 6 },
+     { { 0, 0, 0, 6, false }, { 3, 1, 4, 1, false }, { 3, 2, 0, 1, false },
+       { 3, 2, 1, 1, false }, { 2, 2, 4, 1, false }, { 0, 1, 0, 6, false },
+       { 2, 1, 5, 1, false }, { 2, 2, 5, 1, false }, { 3, 2, 2, 1, false },
+       { 2, 1, 4, 1, false }, { 0, 2, 0, 6, false }, { 3, 1, 5, 1, false },
+       { 3, 2, 3, 1, false }, { 3, 2, 5, 1, false }, { 3, 2, 4, 1, false },
+       { 1, 0, 0, 6, false }, { 2, 1, 0, 4, false }, { 1, 1, 0, 6, false },
+       { 3, 1, 0, 4, false }, { 1, 2, 0, 6, false }, { 2, 2, 0, 4, false },
+       { 2, 0, 0, 6, false }, { 3, 0, 0, 6, false },
+       { -1 } }
+   },
+   /* 11111 */
+   { true /* reserved */ },
+};
+
+/* This partition table is used when the mode has two subsets. Each
+ * partition is represented by a 32-bit value which gives 2 bits per texel
+ * within the block. The value of the two bits represents which subset to use
+ * (0 or 1).
+ */
+static const uint32_t
+partition_table1[N_PARTITIONS] = {
+   0x50505050U, 0x40404040U, 0x54545454U, 0x54505040U,
+   0x50404000U, 0x55545450U, 0x55545040U, 0x54504000U,
+   0x50400000U, 0x55555450U, 0x55544000U, 0x54400000U,
+   0x55555440U, 0x55550000U, 0x55555500U, 0x55000000U,
+   0x55150100U, 0x00004054U, 0x15010000U, 0x00405054U,
+   0x00004050U, 0x15050100U, 0x05010000U, 0x40505054U,
+   0x00404050U, 0x05010100U, 0x14141414U, 0x05141450U,
+   0x01155440U, 0x00555500U, 0x15014054U, 0x05414150U,
+   0x44444444U, 0x55005500U, 0x11441144U, 0x05055050U,
+   0x05500550U, 0x11114444U, 0x41144114U, 0x44111144U,
+   0x15055054U, 0x01055040U, 0x05041050U, 0x05455150U,
+   0x14414114U, 0x50050550U, 0x41411414U, 0x00141400U,
+   0x00041504U, 0x00105410U, 0x10541000U, 0x04150400U,
+   0x50410514U, 0x41051450U, 0x05415014U, 0x14054150U,
+   0x41050514U, 0x41505014U, 0x40011554U, 0x54150140U,
+   0x50505500U, 0x00555050U, 0x15151010U, 0x54540404U,
+};
+
+/* This partition table is used when the mode has three subsets. In this case
+ * the values can be 0, 1 or 2.
+ */
+static const uint32_t
+partition_table2[N_PARTITIONS] = {
+   0xaa685050U, 0x6a5a5040U, 0x5a5a4200U, 0x5450a0a8U,
+   0xa5a50000U, 0xa0a05050U, 0x5555a0a0U, 0x5a5a5050U,
+   0xaa550000U, 0xaa555500U, 0xaaaa5500U, 0x90909090U,
+   0x94949494U, 0xa4a4a4a4U, 0xa9a59450U, 0x2a0a4250U,
+   0xa5945040U, 0x0a425054U, 0xa5a5a500U, 0x55a0a0a0U,
+   0xa8a85454U, 0x6a6a4040U, 0xa4a45000U, 0x1a1a0500U,
+   0x0050a4a4U, 0xaaa59090U, 0x14696914U, 0x69691400U,
+   0xa08585a0U, 0xaa821414U, 0x50a4a450U, 0x6a5a0200U,
+   0xa9a58000U, 0x5090a0a8U, 0xa8a09050U, 0x24242424U,
+   0x00aa5500U, 0x24924924U, 0x24499224U, 0x50a50a50U,
+   0x500aa550U, 0xaaaa4444U, 0x66660000U, 0xa5a0a5a0U,
+   0x50a050a0U, 0x69286928U, 0x44aaaa44U, 0x66666600U,
+   0xaa444444U, 0x54a854a8U, 0x95809580U, 0x96969600U,
+   0xa85454a8U, 0x80959580U, 0xaa141414U, 0x96960000U,
+   0xaaaa1414U, 0xa05050a0U, 0xa0a5a5a0U, 0x96000000U,
+   0x40804080U, 0xa9a8a9a8U, 0xaaaaaa44U, 0x2a4a5254U
+};
+
+static const uint8_t
+anchor_indices[][N_PARTITIONS] = {
+   /* Anchor index values for the second subset of two-subset partitioning */
+   {
+      0xf,0xf,0xf,0xf,0xf,0xf,0xf,0xf,0xf,0xf,0xf,0xf,0xf,0xf,0xf,0xf,
+      0xf,0x2,0x8,0x2,0x2,0x8,0x8,0xf,0x2,0x8,0x2,0x2,0x8,0x8,0x2,0x2,
+      0xf,0xf,0x6,0x8,0x2,0x8,0xf,0xf,0x2,0x8,0x2,0x2,0x2,0xf,0xf,0x6,
+      0x6,0x2,0x6,0x8,0xf,0xf,0x2,0x2,0xf,0xf,0xf,0xf,0xf,0x2,0x2,0xf
+   },
+
+   /* Anchor index values for the second subset of three-subset partitioning */
+   {
+      0x3,0x3,0xf,0xf,0x8,0x3,0xf,0xf,0x8,0x8,0x6,0x6,0x6,0x5,0x3,0x3,
+      0x3,0x3,0x8,0xf,0x3,0x3,0x6,0xa,0x5,0x8,0x8,0x6,0x8,0x5,0xf,0xf,
+      0x8,0xf,0x3,0x5,0x6,0xa,0x8,0xf,0xf,0x3,0xf,0x5,0xf,0xf,0xf,0xf,
+      0x3,0xf,0x5,0x5,0x5,0x8,0x5,0xa,0x5,0xa,0x8,0xd,0xf,0xc,0x3,0x3
+   },
+
+   /* Anchor index values for the third subset of three-subset
+    * partitioning
+    */
+   {
+      0xf,0x8,0x8,0x3,0xf,0xf,0x3,0x8,0xf,0xf,0xf,0xf,0xf,0xf,0xf,0x8,
+      0xf,0x8,0xf,0x3,0xf,0x8,0xf,0x8,0x3,0xf,0x6,0xa,0xf,0xf,0xa,0x8,
+      0xf,0x3,0xf,0xa,0xa,0x8,0x9,0xa,0x6,0xf,0x8,0xf,0x3,0x6,0x6,0x8,
+      0xf,0x3,0xf,0xf,0xf,0xf,0xf,0xf,0xf,0xf,0xf,0xf,0x3,0xf,0xf,0x8
+   }
+};
+
+static int
+extract_bits(const uint8_t *block,
+             int offset,
+             int n_bits)
+{
+   int byte_index = offset / 8;
+   int bit_index = offset % 8;
+   int n_bits_in_byte = MIN2(n_bits, 8 - bit_index);
+   int result = 0;
+   int bit = 0;
+
+   while (true) {
+      result |= ((block[byte_index] >> bit_index) &
+                 ((1 << n_bits_in_byte) - 1)) << bit;
+
+      n_bits -= n_bits_in_byte;
+
+      if (n_bits <= 0)
+         return result;
+
+      bit += n_bits_in_byte;
+      byte_index++;
+      bit_index = 0;
+      n_bits_in_byte = MIN2(n_bits, 8);
+   }
+}
+
+static uint8_t
+expand_component(uint8_t byte,
+                 int n_bits)
+{
+   /* Expands a n-bit quantity into a byte by copying the most-significant
+    * bits into the unused least-significant bits.
+    */
+   return byte << (8 - n_bits) | (byte >> (2 * n_bits - 8));
+}
+
+static int
+extract_unorm_endpoints(const struct bptc_unorm_mode *mode,
+                        const uint8_t *block,
+                        int bit_offset,
+                        uint8_t endpoints[][4])
+{
+   int component;
+   int subset;
+   int endpoint;
+   int pbit;
+   int n_components;
+
+   /* Extract each color component */
+   for (component = 0; component < 3; component++) {
+      for (subset = 0; subset < mode->n_subsets; subset++) {
+         for (endpoint = 0; endpoint < 2; endpoint++) {
+            endpoints[subset * 2 + endpoint][component] =
+               extract_bits(block, bit_offset, mode->n_color_bits);
+            bit_offset += mode->n_color_bits;
+         }
+      }
+   }
+
+   /* Extract the alpha values */
+   if (mode->n_alpha_bits > 0) {
+      for (subset = 0; subset < mode->n_subsets; subset++) {
+         for (endpoint = 0; endpoint < 2; endpoint++) {
+            endpoints[subset * 2 + endpoint][3] =
+               extract_bits(block, bit_offset, mode->n_alpha_bits);
+            bit_offset += mode->n_alpha_bits;
+         }
+      }
+
+      n_components = 4;
+   } else {
+      for (subset = 0; subset < mode->n_subsets; subset++)
+         for (endpoint = 0; endpoint < 2; endpoint++)
+            endpoints[subset * 2 + endpoint][3] = 255;
+
+      n_components = 3;
+   }
+
+   /* Add in the p-bits */
+   if (mode->has_endpoint_pbits) {
+      for (subset = 0; subset < mode->n_subsets; subset++) {
+         for (endpoint = 0; endpoint < 2; endpoint++) {
+            pbit = extract_bits(block, bit_offset, 1);
+            bit_offset += 1;
+
+            for (component = 0; component < n_components; component++) {
+               endpoints[subset * 2 + endpoint][component] <<= 1;
+               endpoints[subset * 2 + endpoint][component] |= pbit;
+            }
+         }
+      }
+   } else if (mode->has_shared_pbits) {
+      for (subset = 0; subset < mode->n_subsets; subset++) {
+         pbit = extract_bits(block, bit_offset, 1);
+         bit_offset += 1;
+
+         for (endpoint = 0; endpoint < 2; endpoint++) {
+            for (component = 0; component < n_components; component++) {
+               endpoints[subset * 2 + endpoint][component] <<= 1;
+               endpoints[subset * 2 + endpoint][component] |= pbit;
+            }
+         }
+      }
+   }
+
+   /* Expand the n-bit values to a byte */
+   for (subset = 0; subset < mode->n_subsets; subset++) {
+      for (endpoint = 0; endpoint < 2; endpoint++) {
+         for (component = 0; component < 3; component++) {
+            endpoints[subset * 2 + endpoint][component] =
+               expand_component(endpoints[subset * 2 + endpoint][component],
+                                mode->n_color_bits +
+                                mode->has_endpoint_pbits +
+                                mode->has_shared_pbits);
+         }
+
+         if (mode->n_alpha_bits > 0) {
+            endpoints[subset * 2 + endpoint][3] =
+               expand_component(endpoints[subset * 2 + endpoint][3],
+                                mode->n_alpha_bits +
+                                mode->has_endpoint_pbits +
+                                mode->has_shared_pbits);
+         }
+      }
+   }
+
+   return bit_offset;
+}
+
+static bool
+is_anchor(int n_subsets,
+          int partition_num,
+          int texel)
+{
+   if (texel == 0)
+      return true;
+
+   switch (n_subsets) {
+   case 1:
+      return false;
+   case 2:
+      return anchor_indices[0][partition_num] == texel;
+   case 3:
+      return (anchor_indices[1][partition_num] == texel ||
+              anchor_indices[2][partition_num] == texel);
+   default:
+      assert(false);
+      return false;
+   }
+}
+
+static int
+count_anchors_before_texel(int n_subsets,
+                           int partition_num,
+                           int texel)
+{
+   int count = 1;
+
+   if (texel == 0)
+      return 0;
+
+   switch (n_subsets) {
+   case 1:
+      break;
+   case 2:
+      if (texel > anchor_indices[0][partition_num])
+         count++;
+      break;
+   case 3:
+      if (texel > anchor_indices[1][partition_num])
+         count++;
+      if (texel > anchor_indices[2][partition_num])
+         count++;
+      break;
+   default:
+      assert(false);
+      return 0;
+   }
+
+   return count;
+}
+
+static int32_t
+interpolate(int32_t a, int32_t b,
+            int index,
+            int index_bits)
+{
+   static const uint8_t weights2[] = { 0, 21, 43, 64 };
+   static const uint8_t weights3[] = { 0, 9, 18, 27, 37, 46, 55, 64 };
+   static const uint8_t weights4[] =
+      { 0, 4, 9, 13, 17, 21, 26, 30, 34, 38, 43, 47, 51, 55, 60, 64 };
+   static const uint8_t *weights[] = {
+      NULL, NULL, weights2, weights3, weights4
+   };
+   int weight;
+
+   weight = weights[index_bits][index];
+
+   return ((64 - weight) * a + weight * b + 32) >> 6;
+}
+
+static void
+apply_rotation(int rotation,
+               uint8_t *result)
+{
+   uint8_t t;
+
+   if (rotation == 0)
+      return;
+
+   rotation--;
+
+   t = result[rotation];
+   result[rotation] = result[3];
+   result[3] = t;
+}
+
+static void
+fetch_rgba_unorm_from_block(const uint8_t *block,
+                            uint8_t *result,
+                            int texel)
+{
+   int mode_num = ffs(block[0]);
+   const struct bptc_unorm_mode *mode;
+   int bit_offset, secondary_bit_offset;
+   int partition_num;
+   int subset_num;
+   int rotation;
+   int index_selection;
+   int index_bits;
+   int indices[2];
+   int index;
+   int anchors_before_texel;
+   bool anchor;
+   uint8_t endpoints[3 * 2][4];
+   uint32_t subsets;
+   int component;
+
+   if (mode_num == 0) {
+      /* According to the spec this mode is reserved and shouldn't be used. */
+      memset(result, 0, 3);
+      result[3] = 0xff;
+      return;
+   }
+
+   mode = bptc_unorm_modes + mode_num - 1;
+   bit_offset = mode_num;
+
+   partition_num = extract_bits(block, bit_offset, mode->n_partition_bits);
+   bit_offset += mode->n_partition_bits;
+
+   switch (mode->n_subsets) {
+   case 1:
+      subsets = 0;
+      break;
+   case 2:
+      subsets = partition_table1[partition_num];
+      break;
+   case 3:
+      subsets = partition_table2[partition_num];
+      break;
+   default:
+      assert(false);
+      return;
+   }
+
+   if (mode->has_rotation_bits) {
+      rotation = extract_bits(block, bit_offset, 2);
+      bit_offset += 2;
+   } else {
+      rotation = 0;
+   }
+
+   if (mode->has_index_selection_bit) {
+      index_selection = extract_bits(block, bit_offset, 1);
+      bit_offset++;
+   } else {
+      index_selection = 0;
+   }
+
+   bit_offset = extract_unorm_endpoints(mode, block, bit_offset, endpoints);
+
+   anchors_before_texel = count_anchors_before_texel(mode->n_subsets,
+                                                     partition_num, texel);
+
+   /* Calculate the offset to the secondary index */
+   secondary_bit_offset = (bit_offset +
+                           BLOCK_SIZE * BLOCK_SIZE * mode->n_index_bits -
+                           mode->n_subsets +
+                           mode->n_secondary_index_bits * texel -
+                           anchors_before_texel);
+
+   /* Calculate the offset to the primary index for this texel */
+   bit_offset += mode->n_index_bits * texel - anchors_before_texel;
+
+   subset_num = (subsets >> (texel * 2)) & 3;
+
+   anchor = is_anchor(mode->n_subsets, partition_num, texel);
+
+   index_bits = mode->n_index_bits;
+   if (anchor)
+      index_bits--;
+   indices[0] = extract_bits(block, bit_offset, index_bits);
+
+   if (mode->n_secondary_index_bits) {
+      index_bits = mode->n_secondary_index_bits;
+      if (anchor)
+         index_bits--;
+      indices[1] = extract_bits(block, secondary_bit_offset, index_bits);
+   }
+
+   index = indices[index_selection];
+   index_bits = (index_selection ?
+                 mode->n_secondary_index_bits :
+                 mode->n_index_bits);
+
+   for (component = 0; component < 3; component++)
+      result[component] = interpolate(endpoints[subset_num * 2][component],
+                                      endpoints[subset_num * 2 + 1][component],
+                                      index,
+                                      index_bits);
+
+   /* Alpha uses the opposite index from the color components */
+   if (mode->n_secondary_index_bits && !index_selection) {
+      index = indices[1];
+      index_bits = mode->n_secondary_index_bits;
+   } else {
+      index = indices[0];
+      index_bits = mode->n_index_bits;
+   }
+
+   result[3] = interpolate(endpoints[subset_num * 2][3],
+                           endpoints[subset_num * 2 + 1][3],
+                           index,
+                           index_bits);
+
+   apply_rotation(rotation, result);
+}
+
+#ifdef BPTC_BLOCK_DECODE
+static void
+decompress_rgba_unorm_block(int src_width, int src_height,
+                            const uint8_t *block,
+                            uint8_t *dst_row, int dst_rowstride)
+{
+   int mode_num = ffs(block[0]);
+   const struct bptc_unorm_mode *mode;
+   int bit_offset, secondary_bit_offset;
+   int partition_num;
+   int subset_num;
+   int rotation;
+   int index_selection;
+   int index_bits;
+   int indices[2];
+   int index;
+   int anchors_before_texel;
+   bool anchor;
+   uint8_t endpoints[3 * 2][4];
+   uint32_t subsets;
+   int component;
+   unsigned x, y;
+
+   if (mode_num == 0) {
+      /* According to the spec this mode is reserved and shouldn't be used. */
+      for(y = 0; y < src_height; y += 1) {
+         uint8_t *result = dst_row;
+         memset(result, 0, 4 * src_width);
+         for(x = 0; x < src_width; x += 1) {
+            result[3] = 0xff;
+            result += 4;
+         }
+         dst_row += dst_rowstride;
+      }
+      return;
+   }
+
+   mode = bptc_unorm_modes + mode_num - 1;
+   bit_offset = mode_num;
+
+   partition_num = extract_bits(block, bit_offset, mode->n_partition_bits);
+   bit_offset += mode->n_partition_bits;
+
+   switch (mode->n_subsets) {
+   case 1:
+      subsets = 0;
+      break;
+   case 2:
+      subsets = partition_table1[partition_num];
+      break;
+   case 3:
+      subsets = partition_table2[partition_num];
+      break;
+   default:
+      assert(false);
+      return;
+   }
+
+   if (mode->has_rotation_bits) {
+      rotation = extract_bits(block, bit_offset, 2);
+      bit_offset += 2;
+   } else {
+      rotation = 0;
+   }
+
+   if (mode->has_index_selection_bit) {
+      index_selection = extract_bits(block, bit_offset, 1);
+      bit_offset++;
+   } else {
+      index_selection = 0;
+   }
+
+   bit_offset = extract_unorm_endpoints(mode, block, bit_offset, endpoints);
+
+   for(y = 0; y < src_height; y += 1) {
+      uint8_t *result = dst_row;
+      for(x = 0; x < src_width; x += 1) {
+         int texel;
+         texel = x + y * 4;
+
+         anchors_before_texel = count_anchors_before_texel(mode->n_subsets,
+                                                           partition_num,
+                                                           texel);
+
+         /* Calculate the offset to the secondary index */
+         secondary_bit_offset = (bit_offset +
+                                 BLOCK_SIZE * BLOCK_SIZE * mode->n_index_bits -
+                                 mode->n_subsets +
+                                 mode->n_secondary_index_bits * texel -
+                                 anchors_before_texel);
+
+         /* Calculate the offset to the primary index for this texel */
+         bit_offset += mode->n_index_bits * texel - anchors_before_texel;
+
+         subset_num = (subsets >> (texel * 2)) & 3;
+
+         anchor = is_anchor(mode->n_subsets, partition_num, texel);
+
+         index_bits = mode->n_index_bits;
+         if (anchor)
+            index_bits--;
+         indices[0] = extract_bits(block, bit_offset, index_bits);
+
+         if (mode->n_secondary_index_bits) {
+            index_bits = mode->n_secondary_index_bits;
+            if (anchor)
+               index_bits--;
+            indices[1] = extract_bits(block, secondary_bit_offset, index_bits);
+         }
+
+         index = indices[index_selection];
+         index_bits = (index_selection ?
+                       mode->n_secondary_index_bits :
+                       mode->n_index_bits);
+
+         for (component = 0; component < 3; component++)
+            result[component] = interpolate(endpoints[subset_num * 2][component],
+                                            endpoints[subset_num * 2 + 1][component],
+                                            index,
+                                            index_bits);
+
+         /* Alpha uses the opposite index from the color components */
+         if (mode->n_secondary_index_bits && !index_selection) {
+            index = indices[1];
+            index_bits = mode->n_secondary_index_bits;
+         } else {
+            index = indices[0];
+            index_bits = mode->n_index_bits;
+         }
+
+         result[3] = interpolate(endpoints[subset_num * 2][3],
+                                 endpoints[subset_num * 2 + 1][3],
+                                 index,
+                                 index_bits);
+
+         apply_rotation(rotation, result);
+         result += 4;
+      }
+      dst_row += dst_rowstride;
+   }
+}
+
+static void
+decompress_rgba_unorm(int width, int height,
+                      const uint8_t *src, int src_rowstride,
+                      uint8_t *dst, int dst_rowstride)
+{
+   int src_row_diff;
+   int y, x;
+
+   if (src_rowstride >= width * 4)
+      src_row_diff = src_rowstride - ((width + 3) & ~3) * 4;
+   else
+      src_row_diff = 0;
+
+   for (y = 0; y < height; y += BLOCK_SIZE) {
+      for (x = 0; x < width; x += BLOCK_SIZE) {
+         decompress_rgba_unorm_block(MIN2(width - x, BLOCK_SIZE),
+                                     MIN2(height - y, BLOCK_SIZE),
+                                     src,
+                                     dst + x * 4 + y * dst_rowstride,
+                                     dst_rowstride);
+         src += BLOCK_BYTES;
+      }
+      src += src_row_diff;
+   }
+}
+#endif // BPTC_BLOCK_DECODE
+
+static int32_t
+sign_extend(int32_t value,
+            int n_bits)
+{
+   if ((value & (1 << (n_bits - 1)))) {
+      value |= (~(int32_t) 0) << n_bits;
+   }
+
+   return value;
+}
+
+static int
+signed_unquantize(int value, int n_endpoint_bits)
+{
+   bool sign;
+
+   if (n_endpoint_bits >= 16)
+      return value;
+
+   if (value == 0)
+      return 0;
+
+   sign = false;
+
+   if (value < 0) {
+      sign = true;
+      value = -value;
+   }
+
+   if (value >= (1 << (n_endpoint_bits - 1)) - 1)
+      value = 0x7fff;
+   else
+      value = ((value << 15) + 0x4000) >> (n_endpoint_bits - 1);
+
+   if (sign)
+      value = -value;
+
+   return value;
+}
+
+static int
+unsigned_unquantize(int value, int n_endpoint_bits)
+{
+   if (n_endpoint_bits >= 15)
+      return value;
+
+   if (value == 0)
+      return 0;
+
+   if (value == (1 << n_endpoint_bits) - 1)
+      return 0xffff;
+
+   return ((value << 15) + 0x4000) >> (n_endpoint_bits - 1);
+}
+
+static int
+extract_float_endpoints(const struct bptc_float_mode *mode,
+                        const uint8_t *block,
+                        int bit_offset,
+                        int32_t endpoints[][3],
+                        bool is_signed)
+{
+   const struct bptc_float_bitfield *bitfield;
+   int endpoint, component;
+   int n_endpoints;
+   int value;
+   int i;
+
+   if (mode->n_partition_bits)
+      n_endpoints = 4;
+   else
+      n_endpoints = 2;
+
+   memset(endpoints, 0, sizeof endpoints[0][0] * n_endpoints * 3);
+
+   for (bitfield = mode->bitfields; bitfield->endpoint != -1; bitfield++) {
+      value = extract_bits(block, bit_offset, bitfield->n_bits);
+      bit_offset += bitfield->n_bits;
+
+      if (bitfield->reverse) {
+         for (i = 0; i < bitfield->n_bits; i++) {
+            if (value & (1 << i))
+               endpoints[bitfield->endpoint][bitfield->component] |=
+                  1 << ((bitfield->n_bits - 1 - i) + bitfield->offset);
+         }
+      } else {
+         endpoints[bitfield->endpoint][bitfield->component] |=
+            value << bitfield->offset;
+      }
+   }
+
+   if (mode->transformed_endpoints) {
+      /* The endpoints are specified as signed offsets from e0 */
+      for (endpoint = 1; endpoint < n_endpoints; endpoint++) {
+         for (component = 0; component < 3; component++) {
+            value = sign_extend(endpoints[endpoint][component],
+                                mode->n_delta_bits[component]);
+            endpoints[endpoint][component] =
+               ((endpoints[0][component] + value) &
+                ((1 << mode->n_endpoint_bits) - 1));
+         }
+      }
+   }
+
+   if (is_signed) {
+      for (endpoint = 0; endpoint < n_endpoints; endpoint++) {
+         for (component = 0; component < 3; component++) {
+            value = sign_extend(endpoints[endpoint][component],
+                                mode->n_endpoint_bits);
+            endpoints[endpoint][component] =
+               signed_unquantize(value, mode->n_endpoint_bits);
+         }
+      }
+   } else {
+      for (endpoint = 0; endpoint < n_endpoints; endpoint++) {
+         for (component = 0; component < 3; component++) {
+            endpoints[endpoint][component] =
+               unsigned_unquantize(endpoints[endpoint][component],
+                                   mode->n_endpoint_bits);
+         }
+      }
+   }
+
+   return bit_offset;
+}
+
+static int32_t
+finish_unsigned_unquantize(int32_t value)
+{
+   return value * 31 / 64;
+}
+
+static int32_t
+finish_signed_unquantize(int32_t value)
+{
+   if (value < 0)
+      return (-value * 31 / 32) | 0x8000;
+   else
+      return value * 31 / 32;
+}
+
+static void
+fetch_rgb_float_from_block(const uint8_t *block,
+                           float *result,
+                           int texel,
+                           bool is_signed)
+{
+   int mode_num;
+   const struct bptc_float_mode *mode;
+   int bit_offset;
+   int partition_num;
+   int subset_num;
+   int index_bits;
+   int index;
+   int anchors_before_texel;
+   int32_t endpoints[2 * 2][3];
+   uint32_t subsets;
+   int n_subsets;
+   int component;
+   int32_t value;
+
+   if (block[0] & 0x2) {
+      mode_num = (((block[0] >> 1) & 0xe) | (block[0] & 1)) + 2;
+      bit_offset = 5;
+   } else {
+      mode_num = block[0] & 3;
+      bit_offset = 2;
+   }
+
+   mode = bptc_float_modes + mode_num;
+
+   if (mode->reserved) {
+      memset(result, 0, sizeof result[0] * 3);
+      result[3] = 1.0f;
+      return;
+   }
+
+   bit_offset = extract_float_endpoints(mode, block, bit_offset,
+                                        endpoints, is_signed);
+
+   if (mode->n_partition_bits) {
+      partition_num = extract_bits(block, bit_offset, mode->n_partition_bits);
+      bit_offset += mode->n_partition_bits;
+
+      subsets = partition_table1[partition_num];
+      n_subsets = 2;
+   } else {
+      partition_num = 0;
+      subsets = 0;
+      n_subsets = 1;
+   }
+
+   anchors_before_texel =
+      count_anchors_before_texel(n_subsets, partition_num, texel);
+
+   /* Calculate the offset to the primary index for this texel */
+   bit_offset += mode->n_index_bits * texel - anchors_before_texel;
+
+   subset_num = (subsets >> (texel * 2)) & 3;
+
+   index_bits = mode->n_index_bits;
+   if (is_anchor(n_subsets, partition_num, texel))
+      index_bits--;
+   index = extract_bits(block, bit_offset, index_bits);
+
+   for (component = 0; component < 3; component++) {
+      value = interpolate(endpoints[subset_num * 2][component],
+                          endpoints[subset_num * 2 + 1][component],
+                          index,
+                          mode->n_index_bits);
+
+      if (is_signed)
+         value = finish_signed_unquantize(value);
+      else
+         value = finish_unsigned_unquantize(value);
+
+      result[component] = _mesa_half_to_float(value);
+   }
+
+   result[3] = 1.0f;
+}
+
+#ifdef BPTC_BLOCK_DECODE
+static void
+decompress_rgb_float_block(unsigned src_width, unsigned src_height,
+                           const uint8_t *block,
+                           float *dst_row, unsigned dst_rowstride,
+                           bool is_signed)
+{
+   int mode_num;
+   const struct bptc_float_mode *mode;
+   int bit_offset;
+   int partition_num;
+   int subset_num;
+   int index_bits;
+   int index;
+   int anchors_before_texel;
+   int32_t endpoints[2 * 2][3];
+   uint32_t subsets;
+   int n_subsets;
+   int component;
+   int32_t value;
+   unsigned x, y;
+
+   if (block[0] & 0x2) {
+      mode_num = (((block[0] >> 1) & 0xe) | (block[0] & 1)) + 2;
+      bit_offset = 5;
+   } else {
+      mode_num = block[0] & 3;
+      bit_offset = 2;
+   }
+
+   mode = bptc_float_modes + mode_num;
+
+   if (mode->reserved) {
+      for(y = 0; y < src_height; y += 1) {
+         float *result = dst_row;
+         memset(result, 0, sizeof result[0] * 4 * src_width);
+         for(x = 0; x < src_width; x += 1) {
+            result[3] = 1.0f;
+            result += 4;
+         }
+         dst_row += dst_rowstride / sizeof dst_row[0];
+      }
+      return;
+   }
+
+   bit_offset = extract_float_endpoints(mode, block, bit_offset,
+                                        endpoints, is_signed);
+
+   if (mode->n_partition_bits) {
+      partition_num = extract_bits(block, bit_offset, mode->n_partition_bits);
+      bit_offset += mode->n_partition_bits;
+
+      subsets = partition_table1[partition_num];
+      n_subsets = 2;
+   } else {
+      partition_num = 0;
+      subsets = 0;
+      n_subsets = 1;
+   }
+
+   for(y = 0; y < src_height; y += 1) {
+      float *result = dst_row;
+      for(x = 0; x < src_width; x += 1) {
+         int texel;
+
+         texel = x + y * 4;
+
+         anchors_before_texel =
+            count_anchors_before_texel(n_subsets, partition_num, texel);
+
+         /* Calculate the offset to the primary index for this texel */
+         bit_offset += mode->n_index_bits * texel - anchors_before_texel;
+
+         subset_num = (subsets >> (texel * 2)) & 3;
+
+         index_bits = mode->n_index_bits;
+         if (is_anchor(n_subsets, partition_num, texel))
+            index_bits--;
+         index = extract_bits(block, bit_offset, index_bits);
+
+         for (component = 0; component < 3; component++) {
+            value = interpolate(endpoints[subset_num * 2][component],
+                                endpoints[subset_num * 2 + 1][component],
+                                index,
+                                mode->n_index_bits);
+
+            if (is_signed)
+               value = finish_signed_unquantize(value);
+            else
+               value = finish_unsigned_unquantize(value);
+
+            result[component] = _mesa_half_to_float(value);
+         }
+
+         result[3] = 1.0f;
+         result += 4;
+      }
+      dst_row += dst_rowstride / sizeof dst_row[0];
+   }
+}
+
+static void
+decompress_rgb_float(int width, int height,
+                      const uint8_t *src, int src_rowstride,
+                      float *dst, int dst_rowstride, bool is_signed)
+{
+   int src_row_diff;
+   int y, x;
+
+   if (src_rowstride >= width * 4)
+      src_row_diff = src_rowstride - ((width + 3) & ~3) * 4;
+   else
+      src_row_diff = 0;
+
+   for (y = 0; y < height; y += BLOCK_SIZE) {
+      for (x = 0; x < width; x += BLOCK_SIZE) {
+         decompress_rgb_float_block(MIN2(width - x, BLOCK_SIZE),
+                                    MIN2(height - y, BLOCK_SIZE),
+                                    src,
+                                    (dst + x * 4 +
+                                     (y * dst_rowstride / sizeof dst[0])),
+                                    dst_rowstride, is_signed);
+         src += BLOCK_BYTES;
+      }
+      src += src_row_diff;
+   }
+}
+#endif // BPTC_BLOCK_DECODE
+
+static void
+write_bits(struct bit_writer *writer, int n_bits, int value)
+{
+   do {
+      if (n_bits + writer->pos >= 8) {
+         *(writer->dst++) = writer->buf | (value << writer->pos);
+         writer->buf = 0;
+         value >>= (8 - writer->pos);
+         n_bits -= (8 - writer->pos);
+         writer->pos = 0;
+      } else {
+         writer->buf |= value << writer->pos;
+         writer->pos += n_bits;
+         break;
+      }
+   } while (n_bits > 0);
+}
+
+static void
+get_average_luminance_alpha_unorm(int width, int height,
+                                  const uint8_t *src, int src_rowstride,
+                                  int *average_luminance, int *average_alpha)
+{
+   int luminance_sum = 0, alpha_sum = 0;
+   int y, x;
+
+   for (y = 0; y < height; y++) {
+      for (x = 0; x < width; x++) {
+         luminance_sum += src[0] + src[1] + src[2];
+         alpha_sum += src[3];
+         src += 4;
+      }
+      src += src_rowstride - width * 4;
+   }
+
+   *average_luminance = luminance_sum / (width * height);
+   *average_alpha = alpha_sum / (width * height);
+}
+
+static void
+get_rgba_endpoints_unorm(int width, int height,
+                         const uint8_t *src, int src_rowstride,
+                         int average_luminance, int average_alpha,
+                         uint8_t endpoints[][4])
+{
+   int endpoint_luminances[2];
+   int midpoint;
+   int sums[2][4];
+   int endpoint;
+   int luminance;
+   uint8_t temp[3];
+   const uint8_t *p = src;
+   int rgb_left_endpoint_count = 0;
+   int alpha_left_endpoint_count = 0;
+   int y, x, i;
+
+   memset(sums, 0, sizeof sums);
+
+   for (y = 0; y < height; y++) {
+      for (x = 0; x < width; x++) {
+         luminance = p[0] + p[1] + p[2];
+         if (luminance < average_luminance) {
+            endpoint = 0;
+            rgb_left_endpoint_count++;
+         } else {
+            endpoint = 1;
+         }
+         for (i = 0; i < 3; i++)
+            sums[endpoint][i] += p[i];
+
+         if (p[2] < average_alpha) {
+            endpoint = 0;
+            alpha_left_endpoint_count++;
+         } else {
+            endpoint = 1;
+         }
+         sums[endpoint][3] += p[3];
+
+         p += 4;
+      }
+
+      p += src_rowstride - width * 4;
+   }
+
+   if (rgb_left_endpoint_count == 0 ||
+       rgb_left_endpoint_count == width * height) {
+      for (i = 0; i < 3; i++)
+         endpoints[0][i] = endpoints[1][i] =
+            (sums[0][i] + sums[1][i]) / (width * height);
+   } else {
+      for (i = 0; i < 3; i++) {
+         endpoints[0][i] = sums[0][i] / rgb_left_endpoint_count;
+         endpoints[1][i] = (sums[1][i] /
+                            (width * height - rgb_left_endpoint_count));
+      }
+   }
+
+   if (alpha_left_endpoint_count == 0 ||
+       alpha_left_endpoint_count == width * height) {
+      endpoints[0][3] = endpoints[1][3] =
+         (sums[0][3] + sums[1][3]) / (width * height);
+   } else {
+         endpoints[0][3] = sums[0][3] / alpha_left_endpoint_count;
+         endpoints[1][3] = (sums[1][3] /
+                            (width * height - alpha_left_endpoint_count));
+   }
+
+   /* We may need to swap the endpoints to ensure the most-significant bit of
+    * the first index is zero */
+
+   for (endpoint = 0; endpoint < 2; endpoint++) {
+      endpoint_luminances[endpoint] =
+         endpoints[endpoint][0] +
+         endpoints[endpoint][1] +
+         endpoints[endpoint][2];
+   }
+   midpoint = (endpoint_luminances[0] + endpoint_luminances[1]) / 2;
+
+   if ((src[0] + src[1] + src[2] <= midpoint) !=
+       (endpoint_luminances[0] <= midpoint)) {
+      memcpy(temp, endpoints[0], 3);
+      memcpy(endpoints[0], endpoints[1], 3);
+      memcpy(endpoints[1], temp, 3);
+   }
+
+   /* Same for the alpha endpoints */
+
+   midpoint = (endpoints[0][3] + endpoints[1][3]) / 2;
+
+   if ((src[3] <= midpoint) != (endpoints[0][3] <= midpoint)) {
+      temp[0] = endpoints[0][3];
+      endpoints[0][3] = endpoints[1][3];
+      endpoints[1][3] = temp[0];
+   }
+}
+
+static void
+write_rgb_indices_unorm(struct bit_writer *writer,
+                        int src_width, int src_height,
+                        const uint8_t *src, int src_rowstride,
+                        uint8_t endpoints[][4])
+{
+   int luminance;
+   int endpoint_luminances[2];
+   int endpoint;
+   int index;
+   int y, x;
+
+   for (endpoint = 0; endpoint < 2; endpoint++) {
+      endpoint_luminances[endpoint] =
+         endpoints[endpoint][0] +
+         endpoints[endpoint][1] +
+         endpoints[endpoint][2];
+   }
+
+   /* If the endpoints have the same luminance then we'll just use index 0 for
+    * all of the texels */
+   if (endpoint_luminances[0] == endpoint_luminances[1]) {
+      write_bits(writer, BLOCK_SIZE * BLOCK_SIZE * 2 - 1, 0);
+      return;
+   }
+
+   for (y = 0; y < src_height; y++) {
+      for (x = 0; x < src_width; x++) {
+         luminance = src[0] + src[1] + src[2];
+
+         index = ((luminance - endpoint_luminances[0]) * 3 /
+                  (endpoint_luminances[1] - endpoint_luminances[0]));
+         if (index < 0)
+            index = 0;
+         else if (index > 3)
+            index = 3;
+
+         assert(x != 0 || y != 0 || index < 2);
+
+         write_bits(writer, (x == 0 && y == 0) ? 1 : 2, index);
+
+         src += 4;
+      }
+
+      /* Pad the indices out to the block size */
+      if (src_width < BLOCK_SIZE)
+         write_bits(writer, 2 * (BLOCK_SIZE - src_width), 0);
+
+      src += src_rowstride - src_width * 4;
+   }
+
+   /* Pad the indices out to the block size */
+   if (src_height < BLOCK_SIZE)
+      write_bits(writer, 2 * BLOCK_SIZE * (BLOCK_SIZE - src_height), 0);
+}
+
+static void
+write_alpha_indices_unorm(struct bit_writer *writer,
+                          int src_width, int src_height,
+                          const uint8_t *src, int src_rowstride,
+                          uint8_t endpoints[][4])
+{
+   int index;
+   int y, x;
+
+   /* If the endpoints have the same alpha then we'll just use index 0 for
+    * all of the texels */
+   if (endpoints[0][3] == endpoints[1][3]) {
+      write_bits(writer, BLOCK_SIZE * BLOCK_SIZE * 3 - 1, 0);
+      return;
+   }
+
+   for (y = 0; y < src_height; y++) {
+      for (x = 0; x < src_width; x++) {
+         index = (((int) src[3] - (int) endpoints[0][3]) * 7 /
+                  ((int) endpoints[1][3] - endpoints[0][3]));
+         if (index < 0)
+            index = 0;
+         else if (index > 7)
+            index = 7;
+
+         assert(x != 0 || y != 0 || index < 4);
+
+         /* The first index has one less bit */
+         write_bits(writer, (x == 0 && y == 0) ? 2 : 3, index);
+
+         src += 4;
+      }
+
+      /* Pad the indices out to the block size */
+      if (src_width < BLOCK_SIZE)
+         write_bits(writer, 3 * (BLOCK_SIZE - src_width), 0);
+
+      src += src_rowstride - src_width * 4;
+   }
+
+   /* Pad the indices out to the block size */
+   if (src_height < BLOCK_SIZE)
+      write_bits(writer, 3 * BLOCK_SIZE * (BLOCK_SIZE - src_height), 0);
+}
+
+static void
+compress_rgba_unorm_block(int src_width, int src_height,
+                          const uint8_t *src, int src_rowstride,
+                          uint8_t *dst)
+{
+   int average_luminance, average_alpha;
+   uint8_t endpoints[2][4];
+   struct bit_writer writer;
+   int component, endpoint;
+
+   get_average_luminance_alpha_unorm(src_width, src_height, src, src_rowstride,
+                                     &average_luminance, &average_alpha);
+   get_rgba_endpoints_unorm(src_width, src_height, src, src_rowstride,
+                            average_luminance, average_alpha,
+                            endpoints);
+
+   writer.dst = dst;
+   writer.pos = 0;
+   writer.buf = 0;
+
+   write_bits(&writer, 5, 0x10); /* mode 4 */
+   write_bits(&writer, 2, 0); /* rotation 0 */
+   write_bits(&writer, 1, 0); /* index selection bit */
+
+   /* Write the color endpoints */
+   for (component = 0; component < 3; component++)
+      for (endpoint = 0; endpoint < 2; endpoint++)
+         write_bits(&writer, 5, endpoints[endpoint][component] >> 3);
+
+   /* Write the alpha endpoints */
+   for (endpoint = 0; endpoint < 2; endpoint++)
+      write_bits(&writer, 6, endpoints[endpoint][3] >> 2);
+
+   write_rgb_indices_unorm(&writer,
+                           src_width, src_height,
+                           src, src_rowstride,
+                           endpoints);
+   write_alpha_indices_unorm(&writer,
+                             src_width, src_height,
+                             src, src_rowstride,
+                             endpoints);
+}
+
+static void
+compress_rgba_unorm(int width, int height,
+                    const uint8_t *src, int src_rowstride,
+                    uint8_t *dst, int dst_rowstride)
+{
+   int dst_row_diff;
+   int y, x;
+
+   if (dst_rowstride >= width * 4)
+      dst_row_diff = dst_rowstride - ((width + 3) & ~3) * 4;
+   else
+      dst_row_diff = 0;
+
+   for (y = 0; y < height; y += BLOCK_SIZE) {
+      for (x = 0; x < width; x += BLOCK_SIZE) {
+         compress_rgba_unorm_block(MIN2(width - x, BLOCK_SIZE),
+                                   MIN2(height - y, BLOCK_SIZE),
+                                   src + x * 4 + y * src_rowstride,
+                                   src_rowstride,
+                                   dst);
+         dst += BLOCK_BYTES;
+      }
+      dst += dst_row_diff;
+   }
+}
+
+static float
+get_average_luminance_float(int width, int height,
+                            const float *src, int src_rowstride)
+{
+   float luminance_sum = 0;
+   int y, x;
+
+   for (y = 0; y < height; y++) {
+      for (x = 0; x < width; x++) {
+         luminance_sum += src[0] + src[1] + src[2];
+         src += 3;
+      }
+      src += (src_rowstride - width * 3 * sizeof (float)) / sizeof (float);
+   }
+
+   return luminance_sum / (width * height);
+}
+
+static float
+clamp_value(float value, bool is_signed)
+{
+   if (value > 65504.0f)
+      return 65504.0f;
+
+   if (is_signed) {
+      if (value < -65504.0f)
+         return -65504.0f;
+      else
+         return value;
+   }
+
+   if (value < 0.0f)
+      return 0.0f;
+
+   return value;
+}
+
+static void
+get_endpoints_float(int width, int height,
+                    const float *src, int src_rowstride,
+                    float average_luminance, float endpoints[][3],
+                    bool is_signed)
+{
+   float endpoint_luminances[2];
+   float midpoint;
+   float sums[2][3];
+   int endpoint, component;
+   float luminance;
+   float temp[3];
+   const float *p = src;
+   int left_endpoint_count = 0;
+   int y, x, i;
+
+   memset(sums, 0, sizeof sums);
+
+   for (y = 0; y < height; y++) {
+      for (x = 0; x < width; x++) {
+         luminance = p[0] + p[1] + p[2];
+         if (luminance < average_luminance) {
+            endpoint = 0;
+            left_endpoint_count++;
+         } else {
+            endpoint = 1;
+         }
+         for (i = 0; i < 3; i++)
+            sums[endpoint][i] += p[i];
+
+         p += 3;
+      }
+
+      p += (src_rowstride - width * 3 * sizeof (float)) / sizeof (float);
+   }
+
+   if (left_endpoint_count == 0 ||
+       left_endpoint_count == width * height) {
+      for (i = 0; i < 3; i++)
+         endpoints[0][i] = endpoints[1][i] =
+            (sums[0][i] + sums[1][i]) / (width * height);
+   } else {
+      for (i = 0; i < 3; i++) {
+         endpoints[0][i] = sums[0][i] / left_endpoint_count;
+         endpoints[1][i] = sums[1][i] / (width * height - left_endpoint_count);
+      }
+   }
+
+   /* Clamp the endpoints to the range of a half float and strip out
+    * infinities */
+   for (endpoint = 0; endpoint < 2; endpoint++) {
+      for (component = 0; component < 3; component++) {
+         endpoints[endpoint][component] =
+            clamp_value(endpoints[endpoint][component], is_signed);
+      }
+   }
+
+   /* We may need to swap the endpoints to ensure the most-significant bit of
+    * the first index is zero */
+
+   for (endpoint = 0; endpoint < 2; endpoint++) {
+      endpoint_luminances[endpoint] =
+         endpoints[endpoint][0] +
+         endpoints[endpoint][1] +
+         endpoints[endpoint][2];
+   }
+   midpoint = (endpoint_luminances[0] + endpoint_luminances[1]) / 2.0f;
+
+   if ((src[0] + src[1] + src[2] <= midpoint) !=
+       (endpoint_luminances[0] <= midpoint)) {
+      memcpy(temp, endpoints[0], sizeof temp);
+      memcpy(endpoints[0], endpoints[1], sizeof temp);
+      memcpy(endpoints[1], temp, sizeof temp);
+   }
+}
+
+static void
+write_rgb_indices_float(struct bit_writer *writer,
+                        int src_width, int src_height,
+                        const float *src, int src_rowstride,
+                        float endpoints[][3])
+{
+   float luminance;
+   float endpoint_luminances[2];
+   int endpoint;
+   int index;
+   int y, x;
+
+   for (endpoint = 0; endpoint < 2; endpoint++) {
+      endpoint_luminances[endpoint] =
+         endpoints[endpoint][0] +
+         endpoints[endpoint][1] +
+         endpoints[endpoint][2];
+   }
+
+   /* If the endpoints have the same luminance then we'll just use index 0 for
+    * all of the texels */
+   if (endpoint_luminances[0] == endpoint_luminances[1]) {
+      write_bits(writer, BLOCK_SIZE * BLOCK_SIZE * 4 - 1, 0);
+      return;
+   }
+
+   for (y = 0; y < src_height; y++) {
+      for (x = 0; x < src_width; x++) {
+         luminance = src[0] + src[1] + src[2];
+
+         index = ((luminance - endpoint_luminances[0]) * 15 /
+                  (endpoint_luminances[1] - endpoint_luminances[0]));
+         if (index < 0)
+            index = 0;
+         else if (index > 15)
+            index = 15;
+
+         assert(x != 0 || y != 0 || index < 8);
+
+         write_bits(writer, (x == 0 && y == 0) ? 3 : 4, index);
+
+         src += 3;
+      }
+
+      /* Pad the indices out to the block size */
+      if (src_width < BLOCK_SIZE)
+         write_bits(writer, 4 * (BLOCK_SIZE - src_width), 0);
+
+      src += (src_rowstride - src_width * 3 * sizeof (float)) / sizeof (float);
+   }
+
+   /* Pad the indices out to the block size */
+   if (src_height < BLOCK_SIZE)
+      write_bits(writer, 4 * BLOCK_SIZE * (BLOCK_SIZE - src_height), 0);
+}
+
+static int
+get_endpoint_value(float value, bool is_signed)
+{
+   bool sign = false;
+   int half;
+
+   if (is_signed) {
+      half = _mesa_float_to_half(value);
+
+      if (half & 0x8000) {
+         half &= 0x7fff;
+         sign = true;
+      }
+
+      half = (32 * half / 31) >> 6;
+
+      if (sign)
+         half = -half & ((1 << 10) - 1);
+
+      return half;
+   } else {
+      if (value <= 0.0f)
+         return 0;
+
+      half = _mesa_float_to_half(value);
+
+      return (64 * half / 31) >> 6;
+   }
+}
+
+static void
+compress_rgb_float_block(int src_width, int src_height,
+                         const float *src, int src_rowstride,
+                         uint8_t *dst,
+                         bool is_signed)
+{
+   float average_luminance;
+   float endpoints[2][3];
+   struct bit_writer writer;
+   int component, endpoint;
+   int endpoint_value;
+
+   average_luminance =
+      get_average_luminance_float(src_width, src_height, src, src_rowstride);
+   get_endpoints_float(src_width, src_height, src, src_rowstride,
+                       average_luminance, endpoints, is_signed);
+
+   writer.dst = dst;
+   writer.pos = 0;
+   writer.buf = 0;
+
+   write_bits(&writer, 5, 3); /* mode 3 */
+
+   /* Write the endpoints */
+   for (endpoint = 0; endpoint < 2; endpoint++) {
+      for (component = 0; component < 3; component++) {
+         endpoint_value =
+            get_endpoint_value(endpoints[endpoint][component], is_signed);
+         write_bits(&writer, 10, endpoint_value);
+      }
+   }
+
+   write_rgb_indices_float(&writer,
+                           src_width, src_height,
+                           src, src_rowstride,
+                           endpoints);
+}
+
+static void
+compress_rgb_float(int width, int height,
+                   const float *src, int src_rowstride,
+                   uint8_t *dst, int dst_rowstride,
+                   bool is_signed)
+{
+   int dst_row_diff;
+   int y, x;
+
+   if (dst_rowstride >= width * 4)
+      dst_row_diff = dst_rowstride - ((width + 3) & ~3) * 4;
+   else
+      dst_row_diff = 0;
+
+   for (y = 0; y < height; y += BLOCK_SIZE) {
+      for (x = 0; x < width; x += BLOCK_SIZE) {
+         compress_rgb_float_block(MIN2(width - x, BLOCK_SIZE),
+                                  MIN2(height - y, BLOCK_SIZE),
+                                  src + x * 3 +
+                                  y * src_rowstride / sizeof (float),
+                                  src_rowstride,
+                                  dst,
+                                  is_signed);
+         dst += BLOCK_BYTES;
+      }
+      dst += dst_row_diff;
+   }
+}