gallium: add RGTC UNORM support to u_format.

SNORM needs a bit of work in the state tracker in order for mipmap
generation to work I believe.

I'm also not sure that having unorm fetches for an snorm format is
sane.

5 files changed, 574 insertions, 2 deletions

diff --git a/src/gallium/auxiliary/util/u_format_pack.py b/src/gallium/auxiliary/util/u_format_pack.py
index 6d0016c0ad8..cc173f808ae 100644
--- a/src/gallium/auxiliary/util/u_format_pack.py
+++ b/src/gallium/auxiliary/util/u_format_pack.py
@@ -632,7 +632,7 @@ def generate_format_fetch(format, dst_channel, dst_native_type, dst_suffix):
 
 
 def is_format_hand_written(format):
-    return format.layout in ('s3tc', 'subsampled', 'other') or format.colorspace == ZS
+    return format.layout in ('s3tc', 'rgtc', 'subsampled', 'other') or format.colorspace == ZS
 
 
 def generate(formats):
diff --git a/src/gallium/auxiliary/util/u_format_rgtc.c b/src/gallium/auxiliary/util/u_format_rgtc.c
new file mode 100644
index 00000000000..6ffcd7e99ef
--- /dev/null
+++ b/src/gallium/auxiliary/util/u_format_rgtc.c
@@ -0,0 +1,452 @@
+/**************************************************************************
+ *
+ * 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"
+
+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_rgtc1_unorm_fetch_rgba_8unorm(uint8_t *dst, const uint8_t *src, unsigned i, unsigned j)
+{
+   u_format_unsigned_fetch_texel_rgtc(0, src, i, j, dst, 1);
+}
+
+void
+util_format_rgtc1_unorm_unpack_rgba_8unorm(uint8_t *dst_row, unsigned dst_stride, const uint8_t *src_row, unsigned src_stride, unsigned width, unsigned height)
+{
+   const unsigned bw = 4, bh = 4, comps = 4;
+   unsigned x, y, i, j;
+   unsigned block_size = 8;
+
+   for(y = 0; y < height; y += bh) {
+      const uint8_t *src = src_row;
+      for(x = 0; x < width; x += bw) {
+         for(j = 0; j < bh; ++j) {
+            for(i = 0; i < bw; ++i) {
+               uint8_t *dst = dst_row + (y + j)*dst_stride/sizeof(*dst_row) + (x + i)*comps;
+	       u_format_unsigned_fetch_texel_rgtc(0, src, i, j, dst, 1);
+	    }
+	 }
+	 src += block_size;
+      }
+      src_row += src_stride;
+   }
+}
+
+void
+util_format_rgtc1_unorm_pack_rgba_8unorm(uint8_t *dst_row, unsigned dst_stride, const uint8_t *src_row, 
+					 unsigned src_stride, unsigned width, unsigned height)
+{
+   const unsigned bw = 4, bh = 4, bytes_per_block = 8;
+   unsigned x, y, i, j;
+
+   for(y = 0; y < height; y += bh) {
+      uint8_t *dst = dst_row;
+      for(x = 0; x < width; x += bw) {
+         uint8_t tmp[4][4];  /* [bh][bw][comps] */
+         for(j = 0; j < bh; ++j) {
+            for(i = 0; i < bw; ++i) {
+	       tmp[j][i] = src_row[(y + j)*src_stride/sizeof(*src_row) + (x + i)*4];
+            }
+         }
+         u_format_unsigned_encode_rgtc_chan(dst, tmp, 4, 4);
+         dst += bytes_per_block;
+      }
+      dst_row += dst_stride / sizeof(*dst_row);
+   }
+}
+
+void
+util_format_rgtc1_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] = ubyte_to_float(tmp_r);
+               dst[1] = 0.0;
+               dst[2] = 0.0;
+               dst[3] = 1.0;
+            }
+         }
+         src += block_size;
+      }
+      src_row += src_stride;
+   }
+}
+
+void
+util_format_rgtc1_unorm_pack_rgba_float(uint8_t *dst_row, unsigned dst_stride, const float *src_row, unsigned src_stride, unsigned width, unsigned height)
+{
+   const unsigned bw = 4, bh = 4, bytes_per_block = 8;
+   unsigned x, y, i, j;
+
+   for(y = 0; y < height; y += bh) {
+      uint8_t *dst = dst_row;
+      for(x = 0; x < width; x += bw) {
+         uint8_t tmp[4][4];  /* [bh][bw][comps] */
+         for(j = 0; j < bh; ++j) {
+            for(i = 0; i < bw; ++i) {
+	       tmp[j][i] = float_to_ubyte(src_row[(y + j)*src_stride/sizeof(*src_row) + (x + i)*4]);
+            }
+         }
+         u_format_unsigned_encode_rgtc_chan(dst, tmp, 4, 4);
+         dst += bytes_per_block;
+      }
+      dst_row += dst_stride / sizeof(*dst_row);
+   }
+}
+
+void
+util_format_rgtc1_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] = ubyte_to_float(tmp_r);
+   dst[1] = 0.0;
+   dst[2] = 0.0;
+   dst[3] = 1.0;
+}
+
+void
+util_format_rgtc1_snorm_fetch_rgba_8unorm(uint8_t *dst, const uint8_t *src, unsigned i, unsigned j)
+{
+   fprintf(stderr,"%s\n", __func__);
+}
+
+void
+util_format_rgtc1_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_rgtc1_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_rgtc1_snorm_pack_rgba_float(uint8_t *dst_row, unsigned dst_stride, const float *src_row, unsigned src_stride, unsigned width, unsigned height)
+{
+   const unsigned bw = 4, bh = 4, bytes_per_block = 8;
+   unsigned x, y, i, j;
+
+   for(y = 0; y < height; y += bh) {
+      int8_t *dst = (int8_t *)dst_row;
+      for(x = 0; x < width; x += bw) {
+         int8_t tmp[4][4];  /* [bh][bw][comps] */
+         for(j = 0; j < bh; ++j) {
+            for(i = 0; i < bw; ++i) {
+	       tmp[j][i] = float_to_byte_tex(src_row[(y + j)*src_stride/sizeof(*src_row) + (x + i)*4]);
+            }
+         }
+         u_format_signed_encode_rgtc_chan(dst, tmp, 4, 4);
+         dst += bytes_per_block;
+      }
+      dst_row += dst_stride / sizeof(*dst_row);
+   }
+}
+
+void
+util_format_rgtc1_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] = byte_to_float_tex(tmp_r);
+               dst[1] = 0.0;
+               dst[2] = 0.0;
+               dst[3] = 1.0;
+            }
+         }
+         src += block_size;
+      }
+      src_row += src_stride;
+   }
+}
+
+void
+util_format_rgtc1_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] = byte_to_float_tex(tmp_r);
+   dst[1] = 0.0;
+   dst[2] = 0.0;
+   dst[3] = 1.0;
+}
+
+
+void
+util_format_rgtc2_unorm_fetch_rgba_8unorm(uint8_t *dst, const uint8_t *src, unsigned i, unsigned j)
+{
+   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_rgtc2_unorm_unpack_rgba_8unorm(uint8_t *dst_row, unsigned dst_stride, const uint8_t *src_row, unsigned src_stride, unsigned width, unsigned height)
+{
+   const unsigned bw = 4, bh = 4, comps = 4;
+   unsigned x, y, i, j;
+   unsigned block_size = 16;
+
+   for(y = 0; y < height; y += bh) {
+      const uint8_t *src = src_row;
+      for(x = 0; x < width; x += bw) {
+         for(j = 0; j < bh; ++j) {
+            for(i = 0; i < bw; ++i) {
+               uint8_t *dst = dst_row + (y + j)*dst_stride/sizeof(*dst_row) + (x + i)*comps;
+	       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);
+
+	    }
+	 }
+	 src += block_size;
+      }
+      src_row += src_stride;
+   }
+}
+
+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)
+{
+   const unsigned bw = 4, bh = 4, bytes_per_block = 16;
+   unsigned x, y, i, j;
+
+   for(y = 0; y < height; y += bh) {
+      uint8_t *dst = dst_row;
+      for(x = 0; x < width; x += bw) {
+         uint8_t tmp_r[4][4];  /* [bh][bw] */
+         uint8_t tmp_g[4][4];  /* [bh][bw] */
+         for(j = 0; j < bh; ++j) {
+            for(i = 0; i < bw; ++i) {
+	       tmp_r[j][i] = src_row[(y + j)*src_stride/sizeof(*src_row) + (x + i)*4];
+	       tmp_g[j][i] = src_row[((y + j)*src_stride/sizeof(*src_row) + (x + i)*4) + 1];
+            }
+         }
+         u_format_unsigned_encode_rgtc_chan(dst, tmp_r, 4, 4);
+         u_format_unsigned_encode_rgtc_chan(dst + 8, tmp_g, 4, 4);
+         dst += bytes_per_block;
+      }
+      dst_row += dst_stride / sizeof(*dst_row);
+   }
+}
+
+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)
+{
+   const unsigned bw = 4, bh = 4, bytes_per_block = 16;
+   unsigned x, y, i, j;
+
+   for(y = 0; y < height; y += bh) {
+      uint8_t *dst = dst_row;
+      for(x = 0; x < width; x += bw) {
+         uint8_t tmp_r[4][4];  /* [bh][bw][comps] */
+         uint8_t tmp_g[4][4];  /* [bh][bw][comps] */
+         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]);
+            }
+         }
+         u_format_unsigned_encode_rgtc_chan(dst, tmp_r, 4, 4);
+         u_format_unsigned_encode_rgtc_chan(dst + 8, tmp_g, 4, 4);
+         dst += bytes_per_block;
+      }
+      dst_row += dst_stride / sizeof(*dst_row);
+   }
+}
+
+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;
+   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] = ubyte_to_float(tmp_r);
+               dst[1] = ubyte_to_float(tmp_g);
+               dst[2] = 0.0;
+               dst[3] = 1.0;
+            }
+         }
+         src += block_size;
+      }
+      src_row += src_stride;
+   }
+}
+
+void
+util_format_rgtc2_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] = ubyte_to_float(tmp_r);
+   dst[1] = ubyte_to_float(tmp_g);
+   dst[2] = 0.0;
+   dst[3] = 1.0;
+}
+
+
+void
+util_format_rgtc2_snorm_fetch_rgba_8unorm(uint8_t *dst, const uint8_t *src, unsigned i, unsigned j)
+{
+   fprintf(stderr,"%s\n", __func__);
+}
+
+void
+util_format_rgtc2_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_rgtc2_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_rgtc2_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] = byte_to_float_tex(tmp_r);
+               dst[1] = byte_to_float_tex(tmp_g);
+               dst[2] = 0.0;
+               dst[3] = 1.0;
+            }
+         }
+         src += block_size;
+      }
+      src_row += src_stride;
+   }
+}
+
+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)
+{
+   const unsigned bw = 4, bh = 4, bytes_per_block = 16;
+   unsigned x, y, i, j;
+
+   for(y = 0; y < height; y += bh) {
+      int8_t *dst = (int8_t *)dst_row;
+      for(x = 0; x < width; x += bw) {
+         int8_t tmp_r[4][4];  /* [bh][bw][comps] */
+         int8_t tmp_g[4][4];  /* [bh][bw][comps] */
+         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]);
+            }
+         }
+         u_format_signed_encode_rgtc_chan(dst, tmp_r, 4, 4);
+         u_format_signed_encode_rgtc_chan(dst + 8, tmp_g, 4, 4);
+         dst += bytes_per_block;
+      }
+      dst_row += dst_stride / sizeof(*dst_row);
+   }
+}
+
+void
+util_format_rgtc2_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] = byte_to_float_tex(tmp_r);
+   dst[1] = byte_to_float_tex(tmp_g);
+   dst[2] = 0.0;
+   dst[3] = 1.0;
+}
+
+
+#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_rgtc.h b/src/gallium/auxiliary/util/u_format_rgtc.h
new file mode 100644
index 00000000000..3e8636d110c
--- /dev/null
+++ b/src/gallium/auxiliary/util/u_format_rgtc.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_RGTC_H_
+#define U_FORMAT_RGTC_H_
+
+void
+util_format_rgtc1_unorm_fetch_rgba_8unorm(uint8_t *dst, const uint8_t *src, unsigned i, unsigned j);
+
+void
+util_format_rgtc1_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_rgtc1_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_rgtc1_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_rgtc1_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_rgtc1_unorm_fetch_rgba_float(float *dst, const uint8_t *src, unsigned i, unsigned j);
+
+
+
+void
+util_format_rgtc1_snorm_fetch_rgba_8unorm(uint8_t *dst, const uint8_t *src, unsigned i, unsigned j);
+
+void
+util_format_rgtc1_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_rgtc1_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_rgtc1_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_rgtc1_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_rgtc1_snorm_fetch_rgba_float(float *dst, const uint8_t *src, unsigned i, unsigned j);
+
+
+void
+util_format_rgtc2_unorm_fetch_rgba_8unorm(uint8_t *dst, const uint8_t *src, unsigned i, unsigned j);
+
+void
+util_format_rgtc2_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_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_rgtc2_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_rgtc2_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_rgtc2_unorm_fetch_rgba_float(float *dst, const uint8_t *src, unsigned i, unsigned j);
+
+
+void
+util_format_rgtc2_snorm_fetch_rgba_8unorm(uint8_t *dst, const uint8_t *src, unsigned i, unsigned j);
+
+void
+util_format_rgtc2_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_rgtc2_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_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_rgtc2_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_rgtc2_snorm_fetch_rgba_float(float *dst, const uint8_t *src, unsigned i, unsigned j);
+
+
+#endif
diff --git a/src/gallium/auxiliary/util/u_format_table.py b/src/gallium/auxiliary/util/u_format_table.py
index 8cc22a56371..7468bc38b32 100755
--- a/src/gallium/auxiliary/util/u_format_table.py
+++ b/src/gallium/auxiliary/util/u_format_table.py
@@ -87,6 +87,7 @@ def write_format_table(formats):
     print
     print '#include "u_format.h"'
     print '#include "u_format_s3tc.h"'
+    print '#include "u_format_rgtc.h"'
     print
     
     u_format_pack.generate(formats)
@@ -132,7 +133,7 @@ def write_format_table(formats):
         if format.colorspace != ZS:
             print "   &util_format_%s_unpack_rgba_8unorm," % format.short_name() 
             print "   &util_format_%s_pack_rgba_8unorm," % format.short_name() 
-            if format.layout == 's3tc':
+            if format.layout == 's3tc' or format.layout == 'rgtc':
                 print "   &util_format_%s_fetch_rgba_8unorm," % format.short_name()
             else:
                 print "   NULL, /* fetch_rgba_8unorm */" 
diff --git a/src/gallium/auxiliary/util/u_math.h b/src/gallium/auxiliary/util/u_math.h
index 30555f92a6d..e3d4c06b6f9 100644
--- a/src/gallium/auxiliary/util/u_math.h
+++ b/src/gallium/auxiliary/util/u_math.h
@@ -475,6 +475,17 @@ float_to_ubyte(float f)
    }
 }
 
+static INLINE float
+byte_to_float_tex(int8_t b)
+{
+   return (b == -128) ? -1.0F : b * 1.0F / 127.0F;
+}
+
+static INLINE int8_t
+float_to_byte_tex(float f)
+{
+   return (int8_t) (127.0F * f);
+}
 
 /**
  * Calc log base 2