gallium/util: add LATC support

Again, a lot of code is shared with RGTC.

The layout is UTIL_FORMAT_LAYOUT_RGTC, because LATC is just swizzled RGTC.

8 files changed, 467 insertions, 4 deletions

diff --git a/src/gallium/auxiliary/Makefile b/src/gallium/auxiliary/Makefile
index e48063166f..59e2f5bc9c 100644
--- a/src/gallium/auxiliary/Makefile
+++ b/src/gallium/auxiliary/Makefile
@@ -110,6 +110,7 @@ C_SOURCES = \
 	util/u_draw_quad.c \
 	util/u_format.c \
 	util/u_format_other.c \
+	util/u_format_latc.c \
 	util/u_format_s3tc.c \
 	util/u_format_rgtc.c \
 	util/u_format_srgb.c \
diff --git a/src/gallium/auxiliary/SConscript b/src/gallium/auxiliary/SConscript
index ef0b15f06c..43d5b2113e 100644
--- a/src/gallium/auxiliary/SConscript
+++ b/src/gallium/auxiliary/SConscript
@@ -157,6 +157,7 @@ source = [
     'util/u_draw_quad.c',
     'util/u_format.c',
     'util/u_format_other.c',
+    'util/u_format_latc.c',
     'util/u_format_s3tc.c',
     'util/u_format_rgtc.c',
     'util/u_format_srgb.c',
diff --git a/src/gallium/auxiliary/util/u_format.csv b/src/gallium/auxiliary/util/u_format.csv
index 26a0eebc54..6f5cc618ff 100644
--- a/src/gallium/auxiliary/util/u_format.csv
+++ b/src/gallium/auxiliary/util/u_format.csv
@@ -141,6 +141,7 @@ PIPE_FORMAT_R8G8Bx_SNORM          , other,      1,  1, sn8 , sn8 ,     ,     , x
 # - http://en.wikipedia.org/wiki/S3_Texture_Compression
 # - http://www.opengl.org/registry/specs/EXT/texture_compression_s3tc.txt
 # - http://www.opengl.org/registry/specs/ARB/texture_compression_rgtc.txt
+# - http://www.opengl.org/registry/specs/EXT/texture_compression_latc.txt
 # - http://msdn.microsoft.com/en-us/library/bb694531.aspx
 PIPE_FORMAT_DXT1_RGB              , s3tc, 4, 4, x64 ,     ,     ,     , xyz1, rgb
 PIPE_FORMAT_DXT1_RGBA             , s3tc, 4, 4, x64 ,     ,     ,     , xyzw, rgb
@@ -156,6 +157,11 @@ PIPE_FORMAT_RGTC1_SNORM           , rgtc, 4, 4, x64,      ,     ,     , x001, rg
 PIPE_FORMAT_RGTC2_UNORM           , rgtc, 4, 4, x128,     ,     ,     , xy01, rgb
 PIPE_FORMAT_RGTC2_SNORM           , rgtc, 4, 4, x128,     ,     ,     , xy01, rgb
 
+PIPE_FORMAT_LATC1_UNORM           , rgtc, 4, 4, x64,      ,     ,     , xxx1, rgb
+PIPE_FORMAT_LATC1_SNORM           , rgtc, 4, 4, x64,      ,     ,     , xxx1, rgb
+PIPE_FORMAT_LATC2_UNORM           , rgtc, 4, 4, x128,     ,     ,     , xxxy, rgb
+PIPE_FORMAT_LATC2_SNORM           , rgtc, 4, 4, x128,     ,     ,     , xxxy, rgb
+
 # Straightforward D3D10-like formats (also used for 
 # vertex buffer element description)
 # 
diff --git a/src/gallium/auxiliary/util/u_format_latc.c b/src/gallium/auxiliary/util/u_format_latc.c
new file mode 100644
index 0000000000..e84c493bb1
--- /dev/null
+++ b/src/gallium/auxiliary/util/u_format_latc.c
@@ -0,0 +1,328 @@
+/**************************************************************************
+ *
+ * Copyright (C) 2011 Red Hat Inc.
+ *
+ * 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 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
+ * BRIAN PAUL 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.
+ *
+ **************************************************************************/
+
+#include <stdio.h>
+#include "u_math.h"
+#include "u_format.h"
+#include "u_format_rgtc.h"
+#include "u_format_latc.h"
+
+static void u_format_unsigned_encode_rgtc_chan(uint8_t *blkaddr, uint8_t srccolors[4][4],
+					       int numxpixels, int numypixels);
+
+static void u_format_unsigned_fetch_texel_rgtc(unsigned srcRowStride, const uint8_t *pixdata,
+					       unsigned i, unsigned j, uint8_t *value, unsigned comps);
+
+static void u_format_signed_encode_rgtc_chan(int8_t *blkaddr, int8_t srccolors[4][4],
+					     int numxpixels, int numypixels);
+
+static void u_format_signed_fetch_texel_rgtc(unsigned srcRowStride, const int8_t *pixdata,
+					       unsigned i, unsigned j, int8_t *value, unsigned comps);
+
+void
+util_format_latc1_unorm_fetch_rgba_8unorm(uint8_t *dst, const uint8_t *src, unsigned i, unsigned j)
+{
+   /* Fix warnings here: */
+   (void) u_format_unsigned_encode_rgtc_chan;
+   (void) u_format_signed_encode_rgtc_chan;
+
+   u_format_unsigned_fetch_texel_rgtc(0, src, i, j, dst, 1);
+}
+
+void
+util_format_latc1_unorm_unpack_rgba_8unorm(uint8_t *dst_row, unsigned dst_stride, const uint8_t *src_row, unsigned src_stride, unsigned width, unsigned height)
+{
+   util_format_rgtc1_unorm_unpack_rgba_8unorm(dst_row, dst_stride, src_row, src_stride, width, height);
+}
+
+void
+util_format_latc1_unorm_pack_rgba_8unorm(uint8_t *dst_row, unsigned dst_stride, const uint8_t *src_row,
+					 unsigned src_stride, unsigned width, unsigned height)
+{
+   util_format_rgtc1_unorm_pack_rgba_8unorm(dst_row, dst_stride, src_row, src_stride, width, height);
+}
+
+void
+util_format_latc1_unorm_unpack_rgba_float(float *dst_row, unsigned dst_stride, const uint8_t *src_row, unsigned src_stride, unsigned width, unsigned height)
+{
+   unsigned x, y, i, j;
+   int block_size = 8;
+
+   for(y = 0; y < height; y += 4) {
+      const uint8_t *src = src_row;
+      for(x = 0; x < width; x += 4) {
+         for(j = 0; j < 4; ++j) {
+            for(i = 0; i < 4; ++i) {
+               float *dst = dst_row + (y + j)*dst_stride/sizeof(*dst_row) + (x + i)*4;
+               uint8_t tmp_r;
+               u_format_unsigned_fetch_texel_rgtc(0, src, i, j, &tmp_r, 1);
+               dst[0] =
+               dst[1] =
+               dst[2] = ubyte_to_float(tmp_r);
+               dst[3] = 1.0;
+            }
+         }
+         src += block_size;
+      }
+      src_row += src_stride;
+   }
+}
+
+void
+util_format_latc1_unorm_pack_rgba_float(uint8_t *dst_row, unsigned dst_stride, const float *src_row, unsigned src_stride, unsigned width, unsigned height)
+{
+   util_format_rgtc1_unorm_pack_rgba_float(dst_row, dst_stride, src_row, src_stride, width, height);
+}
+
+void
+util_format_latc1_unorm_fetch_rgba_float(float *dst, const uint8_t *src, unsigned i, unsigned j)
+{
+   uint8_t tmp_r;
+
+   u_format_unsigned_fetch_texel_rgtc(0, src, i, j, &tmp_r, 1);
+   dst[0] =
+   dst[1] =
+   dst[2] = ubyte_to_float(tmp_r);
+   dst[3] = 1.0;
+}
+
+void
+util_format_latc1_snorm_fetch_rgba_8unorm(uint8_t *dst, const uint8_t *src, unsigned i, unsigned j)
+{
+   fprintf(stderr,"%s\n", __func__);
+}
+
+void
+util_format_latc1_snorm_unpack_rgba_8unorm(uint8_t *dst_row, unsigned dst_stride, const uint8_t *src_row, unsigned src_stride, unsigned width, unsigned height)
+{
+   fprintf(stderr,"%s\n", __func__);
+}
+
+void
+util_format_latc1_snorm_pack_rgba_8unorm(uint8_t *dst_row, unsigned dst_stride, const uint8_t *src_row, unsigned src_stride, unsigned width, unsigned height)
+{
+   fprintf(stderr,"%s\n", __func__);
+}
+
+void
+util_format_latc1_snorm_pack_rgba_float(uint8_t *dst_row, unsigned dst_stride, const float *src_row, unsigned src_stride, unsigned width, unsigned height)
+{
+   util_format_rgtc1_snorm_pack_rgba_float(dst_row, dst_stride, src_row, src_stride, width, height);
+}
+
+void
+util_format_latc1_snorm_unpack_rgba_float(float *dst_row, unsigned dst_stride, const uint8_t *src_row, unsigned src_stride, unsigned width, unsigned height)
+{
+   unsigned x, y, i, j;
+   int block_size = 8;
+
+   for(y = 0; y < height; y += 4) {
+      const int8_t *src = (int8_t *)src_row;
+      for(x = 0; x < width; x += 4) {
+         for(j = 0; j < 4; ++j) {
+            for(i = 0; i < 4; ++i) {
+               float *dst = dst_row + (y + j)*dst_stride/sizeof(*dst_row) + (x + i)*4;
+               int8_t tmp_r;
+               u_format_signed_fetch_texel_rgtc(0, src, i, j, &tmp_r, 1);
+               dst[0] =
+               dst[1] =
+               dst[2] = byte_to_float_tex(tmp_r);
+               dst[3] = 1.0;
+            }
+         }
+         src += block_size;
+      }
+      src_row += src_stride;
+   }
+}
+
+void
+util_format_latc1_snorm_fetch_rgba_float(float *dst, const uint8_t *src, unsigned i, unsigned j)
+{
+   int8_t tmp_r;
+
+   u_format_signed_fetch_texel_rgtc(0, (int8_t *)src, i, j, &tmp_r, 1);
+   dst[0] =
+   dst[1] =
+   dst[2] = byte_to_float_tex(tmp_r);
+   dst[3] = 1.0;
+}
+
+
+void
+util_format_latc2_unorm_fetch_rgba_8unorm(uint8_t *dst, const uint8_t *src, unsigned i, unsigned j)
+{
+   puts(__func__);
+
+   u_format_unsigned_fetch_texel_rgtc(0, src, i, j, dst, 2);
+   u_format_unsigned_fetch_texel_rgtc(0, src + 8, i, j, dst + 1, 2);
+}
+
+void
+util_format_latc2_unorm_unpack_rgba_8unorm(uint8_t *dst_row, unsigned dst_stride, const uint8_t *src_row, unsigned src_stride, unsigned width, unsigned height)
+{
+   util_format_rgtc2_unorm_unpack_rgba_8unorm(dst_row, dst_stride, src_row, src_stride, width, height);
+}
+
+void
+util_format_latc2_unorm_pack_rgba_8unorm(uint8_t *dst_row, unsigned dst_stride, const uint8_t *src_row, unsigned src_stride, unsigned width, unsigned height)
+{
+   util_format_rgtc2_unorm_pack_rgba_8unorm(dst_row, dst_stride, src_row, src_stride, width, height);
+}
+
+void
+util_format_latc2_unorm_pack_rgba_float(uint8_t *dst_row, unsigned dst_stride, const float *src_row, unsigned src_stride, unsigned width, unsigned height)
+{
+   util_format_rxtc2_unorm_pack_rgba_float(dst_row, dst_stride, src_row, src_stride, width, height, 3);
+}
+
+void
+util_format_latc2_unorm_unpack_rgba_float(float *dst_row, unsigned dst_stride, const uint8_t *src_row, unsigned src_stride, unsigned width, unsigned height)
+{
+   unsigned x, y, i, j;
+   int block_size = 16;
+
+   for(y = 0; y < height; y += 4) {
+      const uint8_t *src = src_row;
+      for(x = 0; x < width; x += 4) {
+         for(j = 0; j < 4; ++j) {
+            for(i = 0; i < 4; ++i) {
+               float *dst = dst_row + (y + j)*dst_stride/sizeof(*dst_row) + (x + i)*4;
+               uint8_t tmp_r, tmp_g;
+               u_format_unsigned_fetch_texel_rgtc(0, src, i, j, &tmp_r, 2);
+               u_format_unsigned_fetch_texel_rgtc(0, src + 8, i, j, &tmp_g, 2);
+               dst[0] =
+               dst[1] =
+               dst[2] = ubyte_to_float(tmp_r);
+               dst[3] = ubyte_to_float(tmp_g);
+            }
+         }
+         src += block_size;
+      }
+      src_row += src_stride;
+   }
+}
+
+void
+util_format_latc2_unorm_fetch_rgba_float(float *dst, const uint8_t *src, unsigned i, unsigned j)
+{
+   uint8_t tmp_r, tmp_g;
+
+   u_format_unsigned_fetch_texel_rgtc(0, src, i, j, &tmp_r, 2);
+   u_format_unsigned_fetch_texel_rgtc(0, src + 8, i, j, &tmp_g, 2);
+   dst[0] =
+   dst[1] =
+   dst[2] = ubyte_to_float(tmp_r);
+   dst[3] = ubyte_to_float(tmp_g);
+}
+
+
+void
+util_format_latc2_snorm_fetch_rgba_8unorm(uint8_t *dst, const uint8_t *src, unsigned i, unsigned j)
+{
+   fprintf(stderr,"%s\n", __func__);
+}
+
+void
+util_format_latc2_snorm_unpack_rgba_8unorm(uint8_t *dst_row, unsigned dst_stride, const uint8_t *src_row, unsigned src_stride, unsigned width, unsigned height)
+{
+   fprintf(stderr,"%s\n", __func__);
+}
+
+void
+util_format_latc2_snorm_pack_rgba_8unorm(uint8_t *dst_row, unsigned dst_stride, const uint8_t *src_row, unsigned src_stride, unsigned width, unsigned height)
+{
+   fprintf(stderr,"%s\n", __func__);
+}
+
+void
+util_format_latc2_snorm_unpack_rgba_float(float *dst_row, unsigned dst_stride, const uint8_t *src_row, unsigned src_stride, unsigned width, unsigned height)
+{
+   unsigned x, y, i, j;
+   int block_size = 16;
+
+   for(y = 0; y < height; y += 4) {
+      const int8_t *src = (int8_t *)src_row;
+      for(x = 0; x < width; x += 4) {
+         for(j = 0; j < 4; ++j) {
+            for(i = 0; i < 4; ++i) {
+               float *dst = dst_row + (y + j)*dst_stride/sizeof(*dst_row) + (x + i)*4;
+               int8_t tmp_r, tmp_g;
+               u_format_signed_fetch_texel_rgtc(0, src, i, j, &tmp_r, 2);
+               u_format_signed_fetch_texel_rgtc(0, src + 8, i, j, &tmp_g, 2);
+               dst[0] =
+               dst[1] =
+               dst[2] = byte_to_float_tex(tmp_r);
+               dst[3] = byte_to_float_tex(tmp_g);
+            }
+         }
+         src += block_size;
+      }
+      src_row += src_stride;
+   }
+}
+
+void
+util_format_latc2_snorm_pack_rgba_float(uint8_t *dst_row, unsigned dst_stride, const float *src_row, unsigned src_stride, unsigned width, unsigned height)
+{
+   util_format_rxtc2_snorm_pack_rgba_float(dst_row, dst_stride, src_row, src_stride, width, height, 3);
+}
+
+void
+util_format_latc2_snorm_fetch_rgba_float(float *dst, const uint8_t *src, unsigned i, unsigned j)
+{
+   int8_t tmp_r, tmp_g;
+
+   u_format_signed_fetch_texel_rgtc(0, (int8_t *)src, i, j, &tmp_r, 2);
+   u_format_signed_fetch_texel_rgtc(0, (int8_t *)src + 8, i, j, &tmp_g, 2);
+   dst[0] =
+   dst[1] =
+   dst[2] = byte_to_float_tex(tmp_r);
+   dst[3] = byte_to_float_tex(tmp_g);
+}
+
+
+#define TAG(x) u_format_unsigned_##x
+#define TYPE uint8_t
+#define T_MIN 0
+#define T_MAX 255
+
+#include "../../../mesa/main/texcompress_rgtc_tmp.h"
+
+#undef TYPE
+#undef TAG
+#undef T_MIN
+#undef T_MAX
+
+
+#define TAG(x) u_format_signed_##x
+#define TYPE int8_t
+#define T_MIN (int8_t)-128
+#define T_MAX (int8_t)127
+
+#include "../../../mesa/main/texcompress_rgtc_tmp.h"
+
+#undef TYPE
+#undef TAG
+#undef T_MIN
+#undef T_MAX
diff --git a/src/gallium/auxiliary/util/u_format_latc.h b/src/gallium/auxiliary/util/u_format_latc.h
new file mode 100644
index 0000000000..1f08887533
--- /dev/null
+++ b/src/gallium/auxiliary/util/u_format_latc.h
@@ -0,0 +1,108 @@
+/**************************************************************************
+ *
+ * Copyright 2011 Red Hat Inc.
+ * All Rights Reserved.
+ *
+ * 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, sub license, 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 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 NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS 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.
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ **************************************************************************/
+
+#ifndef U_FORMAT_LATC_H_
+#define U_FORMAT_LATC_H_
+
+void
+util_format_latc1_unorm_fetch_rgba_8unorm(uint8_t *dst, const uint8_t *src, unsigned i, unsigned j);
+
+void
+util_format_latc1_unorm_unpack_rgba_8unorm(uint8_t *dst_row, unsigned dst_stride, const uint8_t *src_row, unsigned src_stride, unsigned width, unsigned height);
+
+void
+util_format_latc1_unorm_pack_rgba_8unorm(uint8_t *dst_row, unsigned dst_stride, const uint8_t *src_row, unsigned src_stride, unsigned width, unsigned height);
+
+void
+util_format_latc1_unorm_unpack_rgba_float(float *dst_row, unsigned dst_stride, const uint8_t *src_row, unsigned src_stride, unsigned width, unsigned height);
+
+void
+util_format_latc1_unorm_pack_rgba_float(uint8_t *dst_row, unsigned dst_stride, const float *src_row, unsigned src_stride, unsigned width, unsigned height);
+
+void
+util_format_latc1_unorm_fetch_rgba_float(float *dst, const uint8_t *src, unsigned i, unsigned j);
+
+
+
+void
+util_format_latc1_snorm_fetch_rgba_8unorm(uint8_t *dst, const uint8_t *src, unsigned i, unsigned j);
+
+void
+util_format_latc1_snorm_unpack_rgba_8unorm(uint8_t *dst_row, unsigned dst_stride, const uint8_t *src_row, unsigned src_stride, unsigned width, unsigned height);
+
+void
+util_format_latc1_snorm_pack_rgba_8unorm(uint8_t *dst_row, unsigned dst_stride, const uint8_t *src_row, unsigned src_stride, unsigned width, unsigned height);
+
+void
+util_format_latc1_snorm_pack_rgba_float(uint8_t *dst_row, unsigned dst_stride, const float *src_row, unsigned src_stride, unsigned width, unsigned height);
+
+void
+util_format_latc1_snorm_unpack_rgba_float(float *dst_row, unsigned dst_stride, const uint8_t *src_row, unsigned src_stride, unsigned width, unsigned height);
+
+void
+util_format_latc1_snorm_fetch_rgba_float(float *dst, const uint8_t *src, unsigned i, unsigned j);
+
+
+void
+util_format_latc2_unorm_fetch_rgba_8unorm(uint8_t *dst, const uint8_t *src, unsigned i, unsigned j);
+
+void
+util_format_latc2_unorm_unpack_rgba_8unorm(uint8_t *dst_row, unsigned dst_stride, const uint8_t *src_row, unsigned src_stride, unsigned width, unsigned height);
+
+void
+util_format_latc2_unorm_pack_rgba_8unorm(uint8_t *dst_row, unsigned dst_stride, const uint8_t *src_row, unsigned src_stride, unsigned width, unsigned height);
+
+void
+util_format_latc2_unorm_pack_rgba_float(uint8_t *dst_row, unsigned dst_stride, const float *src_row, unsigned src_stride, unsigned width, unsigned height);
+
+void
+util_format_latc2_unorm_unpack_rgba_float(float *dst_row, unsigned dst_stride, const uint8_t *src_row, unsigned src_stride, unsigned width, unsigned height);
+
+void
+util_format_latc2_unorm_fetch_rgba_float(float *dst, const uint8_t *src, unsigned i, unsigned j);
+
+
+void
+util_format_latc2_snorm_fetch_rgba_8unorm(uint8_t *dst, const uint8_t *src, unsigned i, unsigned j);
+
+void
+util_format_latc2_snorm_unpack_rgba_8unorm(uint8_t *dst_row, unsigned dst_stride, const uint8_t *src_row, unsigned src_stride, unsigned width, unsigned height);
+
+void
+util_format_latc2_snorm_pack_rgba_8unorm(uint8_t *dst_row, unsigned dst_stride, const uint8_t *src_row, unsigned src_stride, unsigned width, unsigned height);
+
+void
+util_format_latc2_snorm_unpack_rgba_float(float *dst_row, unsigned dst_stride, const uint8_t *src_row, unsigned src_stride, unsigned width, unsigned height);
+
+void
+util_format_latc2_snorm_pack_rgba_float(uint8_t *dst_row, unsigned dst_stride, const float *src_row, unsigned src_stride, unsigned width, unsigned height);
+
+void
+util_format_latc2_snorm_fetch_rgba_float(float *dst, const uint8_t *src, unsigned i, unsigned j);
+
+
+#endif
diff --git a/src/gallium/auxiliary/util/u_format_rgtc.c b/src/gallium/auxiliary/util/u_format_rgtc.c
index 6ffcd7e99e..c929fd47e9 100644
--- a/src/gallium/auxiliary/util/u_format_rgtc.c
+++ b/src/gallium/auxiliary/util/u_format_rgtc.c
@@ -281,7 +281,7 @@ util_format_rgtc2_unorm_pack_rgba_8unorm(uint8_t *dst_row, unsigned dst_stride,
 }
 
 void
-util_format_rgtc2_unorm_pack_rgba_float(uint8_t *dst_row, unsigned dst_stride, const float *src_row, unsigned src_stride, unsigned width, unsigned height)
+util_format_rxtc2_unorm_pack_rgba_float(uint8_t *dst_row, unsigned dst_stride, const float *src_row, unsigned src_stride, unsigned width, unsigned height, unsigned chan2off)
 {
    const unsigned bw = 4, bh = 4, bytes_per_block = 16;
    unsigned x, y, i, j;
@@ -294,7 +294,7 @@ util_format_rgtc2_unorm_pack_rgba_float(uint8_t *dst_row, unsigned dst_stride, c
          for(j = 0; j < bh; ++j) {
             for(i = 0; i < bw; ++i) {
 	       tmp_r[j][i] = float_to_ubyte(src_row[(y + j)*src_stride/sizeof(*src_row) + (x + i)*4]);
-	       tmp_g[j][i] = float_to_ubyte(src_row[(y + j)*src_stride/sizeof(*src_row) + (x + i)*4 + 1]);
+               tmp_g[j][i] = float_to_ubyte(src_row[(y + j)*src_stride/sizeof(*src_row) + (x + i)*4 + chan2off]);
             }
          }
          u_format_unsigned_encode_rgtc_chan(dst, tmp_r, 4, 4);
@@ -306,6 +306,12 @@ util_format_rgtc2_unorm_pack_rgba_float(uint8_t *dst_row, unsigned dst_stride, c
 }
 
 void
+util_format_rgtc2_unorm_pack_rgba_float(uint8_t *dst_row, unsigned dst_stride, const float *src_row, unsigned src_stride, unsigned width, unsigned height)
+{
+   util_format_rxtc2_unorm_pack_rgba_float(dst_row, dst_stride, src_row, src_stride, width, height, 1);
+}
+
+void
 util_format_rgtc2_unorm_unpack_rgba_float(float *dst_row, unsigned dst_stride, const uint8_t *src_row, unsigned src_stride, unsigned width, unsigned height)
 {
    unsigned x, y, i, j;
@@ -389,7 +395,7 @@ util_format_rgtc2_snorm_unpack_rgba_float(float *dst_row, unsigned dst_stride, c
 }
 
 void
-util_format_rgtc2_snorm_pack_rgba_float(uint8_t *dst_row, unsigned dst_stride, const float *src_row, unsigned src_stride, unsigned width, unsigned height)
+util_format_rxtc2_snorm_pack_rgba_float(uint8_t *dst_row, unsigned dst_stride, const float *src_row, unsigned src_stride, unsigned width, unsigned height, unsigned chan2off)
 {
    const unsigned bw = 4, bh = 4, bytes_per_block = 16;
    unsigned x, y, i, j;
@@ -402,7 +408,7 @@ util_format_rgtc2_snorm_pack_rgba_float(uint8_t *dst_row, unsigned dst_stride, c
          for(j = 0; j < bh; ++j) {
             for(i = 0; i < bw; ++i) {
 	       tmp_r[j][i] = float_to_byte_tex(src_row[(y + j)*src_stride/sizeof(*src_row) + (x + i)*4]);
-	       tmp_g[j][i] = float_to_byte_tex(src_row[(y + j)*src_stride/sizeof(*src_row) + (x + i)*4 + 1]);
+               tmp_g[j][i] = float_to_byte_tex(src_row[(y + j)*src_stride/sizeof(*src_row) + (x + i)*4 + chan2off]);
             }
          }
          u_format_signed_encode_rgtc_chan(dst, tmp_r, 4, 4);
@@ -414,6 +420,12 @@ util_format_rgtc2_snorm_pack_rgba_float(uint8_t *dst_row, unsigned dst_stride, c
 }
 
 void
+util_format_rgtc2_snorm_pack_rgba_float(uint8_t *dst_row, unsigned dst_stride, const float *src_row, unsigned src_stride, unsigned width, unsigned height)
+{
+   util_format_rxtc2_snorm_pack_rgba_float(dst_row, dst_stride, src_row, src_stride, width, height, 1);
+}
+
+void
 util_format_rgtc2_snorm_fetch_rgba_float(float *dst, const uint8_t *src, unsigned i, unsigned j)
 {
    int8_t tmp_r, tmp_g;
diff --git a/src/gallium/auxiliary/util/u_format_rgtc.h b/src/gallium/auxiliary/util/u_format_rgtc.h
index 3e8636d110..67ac4728e5 100644
--- a/src/gallium/auxiliary/util/u_format_rgtc.h
+++ b/src/gallium/auxiliary/util/u_format_rgtc.h
@@ -77,6 +77,9 @@ void
 util_format_rgtc2_unorm_pack_rgba_8unorm(uint8_t *dst_row, unsigned dst_stride, const uint8_t *src_row, unsigned src_stride, unsigned width, unsigned height);
 
 void
+util_format_rxtc2_unorm_pack_rgba_float(uint8_t *dst_row, unsigned dst_stride, const float *src_row, unsigned src_stride, unsigned width, unsigned height, unsigned chan2off);
+
+void
 util_format_rgtc2_unorm_pack_rgba_float(uint8_t *dst_row, unsigned dst_stride, const float *src_row, unsigned src_stride, unsigned width, unsigned height);
 
 void
@@ -99,6 +102,9 @@ void
 util_format_rgtc2_snorm_unpack_rgba_float(float *dst_row, unsigned dst_stride, const uint8_t *src_row, unsigned src_stride, unsigned width, unsigned height);
 
 void
+util_format_rxtc2_snorm_pack_rgba_float(uint8_t *dst_row, unsigned dst_stride, const float *src_row, unsigned src_stride, unsigned width, unsigned height, unsigned chan2off);
+
+void
 util_format_rgtc2_snorm_pack_rgba_float(uint8_t *dst_row, unsigned dst_stride, const float *src_row, unsigned src_stride, unsigned width, unsigned height);
 
 void
diff --git a/src/gallium/auxiliary/util/u_format_table.py b/src/gallium/auxiliary/util/u_format_table.py
index 7468bc38b3..55e0f7827e 100755
--- a/src/gallium/auxiliary/util/u_format_table.py
+++ b/src/gallium/auxiliary/util/u_format_table.py
@@ -88,6 +88,7 @@ def write_format_table(formats):
     print '#include "u_format.h"'
     print '#include "u_format_s3tc.h"'
     print '#include "u_format_rgtc.h"'
+    print '#include "u_format_latc.h"'
     print
     
     u_format_pack.generate(formats)