1 files changed, 288 insertions, 288 deletions
diff --git a/mesalib/src/mesa/main/texcompress.c b/mesalib/src/mesa/main/texcompress.c
index d820ae927..59603e81e 100644
--- a/mesalib/src/mesa/main/texcompress.c
+++ b/mesalib/src/mesa/main/texcompress.c
@@ -1,288 +1,288 @@
-/*
- * Mesa 3-D graphics library
- * Version:  6.5.1
- *
- * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
- * Copyright (c) 2008 VMware, 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.
- */
-
-
-/**
- * \file texcompress.c
- * Helper functions for texture compression.
- */
-
-
-#include "glheader.h"
-#include "imports.h"
-#include "colormac.h"
-#include "formats.h"
-#include "mfeatures.h"
-#include "mtypes.h"
-#include "texcompress.h"
-
-
-/**
- * Return list of (and count of) all specific texture compression
- * formats that are supported.
- *
- * \param ctx  the GL context
- * \param formats  the resulting format list (may be NULL).
- * \param all  if true return all formats, even those with  some kind
- *             of restrictions/limitations (See GL_ARB_texture_compression
- *             spec for more info).
- *
- * \return number of formats.
- */
-GLuint
-_mesa_get_compressed_formats(struct gl_context *ctx, GLint *formats, GLboolean all)
-{
-   GLuint n = 0;
-   if (ctx->Extensions.TDFX_texture_compression_FXT1) {
-      if (formats) {
-         formats[n++] = GL_COMPRESSED_RGB_FXT1_3DFX;
-         formats[n++] = GL_COMPRESSED_RGBA_FXT1_3DFX;
-      }
-      else {
-         n += 2;
-      }
-   }
-   /* don't return RGTC - ARB_texture_compression_rgtc query 19 */
-   if (ctx->Extensions.EXT_texture_compression_s3tc) {
-      if (formats) {
-         formats[n++] = GL_COMPRESSED_RGB_S3TC_DXT1_EXT;
-         /* This format has some restrictions/limitations and so should
-          * not be returned via the GL_COMPRESSED_TEXTURE_FORMATS query.
-          * Specifically, all transparent pixels become black.  NVIDIA
-          * omits this format too.
-          */
-         if (all)
-             formats[n++] = GL_COMPRESSED_RGBA_S3TC_DXT1_EXT;
-         formats[n++] = GL_COMPRESSED_RGBA_S3TC_DXT3_EXT;
-         formats[n++] = GL_COMPRESSED_RGBA_S3TC_DXT5_EXT;
-      }
-      else {
-         n += 3;
-         if (all)
-             n += 1;
-      }
-   }
-   if (ctx->Extensions.S3_s3tc) {
-      if (formats) {
-         formats[n++] = GL_RGB_S3TC;
-         formats[n++] = GL_RGB4_S3TC;
-         formats[n++] = GL_RGBA_S3TC;
-         formats[n++] = GL_RGBA4_S3TC;
-      }
-      else {
-         n += 4;
-      }
-   }
-#if FEATURE_EXT_texture_sRGB
-   if (ctx->Extensions.EXT_texture_sRGB) {
-      if (formats) {
-         formats[n++] = GL_COMPRESSED_SRGB_S3TC_DXT1_EXT;
-         formats[n++] = GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT;
-         formats[n++] = GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT;
-         formats[n++] = GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT;
-      }
-      else {
-         n += 4;
-      }
-   }
-#endif /* FEATURE_EXT_texture_sRGB */
-   return n;
-
-#if FEATURE_ES1 || FEATURE_ES2
-   if (formats) {
-      formats[n++] = GL_PALETTE4_RGB8_OES;
-      formats[n++] = GL_PALETTE4_RGBA8_OES;
-      formats[n++] = GL_PALETTE4_R5_G6_B5_OES;
-      formats[n++] = GL_PALETTE4_RGBA4_OES;
-      formats[n++] = GL_PALETTE4_RGB5_A1_OES;
-      formats[n++] = GL_PALETTE8_RGB8_OES;
-      formats[n++] = GL_PALETTE8_RGBA8_OES;
-      formats[n++] = GL_PALETTE8_R5_G6_B5_OES;
-      formats[n++] = GL_PALETTE8_RGBA4_OES;
-      formats[n++] = GL_PALETTE8_RGB5_A1_OES;
-   }
-   else {
-      n += 10;
-   }
-#endif
-}
-
-
-/**
- * Convert a compressed MESA_FORMAT_x to a GLenum.
- */
-gl_format
-_mesa_glenum_to_compressed_format(GLenum format)
-{
-   switch (format) {
-   case GL_COMPRESSED_RGB_FXT1_3DFX:
-      return MESA_FORMAT_RGB_FXT1;
-   case GL_COMPRESSED_RGBA_FXT1_3DFX:
-      return MESA_FORMAT_RGBA_FXT1;
-
-   case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
-   case GL_RGB_S3TC:
-      return MESA_FORMAT_RGB_DXT1;
-   case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
-   case GL_RGB4_S3TC:
-      return MESA_FORMAT_RGBA_DXT1;
-   case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
-   case GL_RGBA_S3TC:
-      return MESA_FORMAT_RGBA_DXT3;
-   case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
-   case GL_RGBA4_S3TC:
-      return MESA_FORMAT_RGBA_DXT5;
-
-   case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
-      return MESA_FORMAT_SRGB_DXT1;
-   case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
-      return MESA_FORMAT_SRGBA_DXT1;
-   case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
-      return MESA_FORMAT_SRGBA_DXT3;
-   case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
-      return MESA_FORMAT_SRGBA_DXT5;
-
-   case GL_COMPRESSED_RED_RGTC1:
-      return MESA_FORMAT_RED_RGTC1;
-   case GL_COMPRESSED_SIGNED_RED_RGTC1:
-      return MESA_FORMAT_SIGNED_RED_RGTC1;
-   case GL_COMPRESSED_RG_RGTC2:
-      return MESA_FORMAT_RG_RGTC2;
-   case GL_COMPRESSED_SIGNED_RG_RGTC2:
-      return MESA_FORMAT_SIGNED_RG_RGTC2;
-
-   case GL_COMPRESSED_LUMINANCE_LATC1_EXT:
-      return MESA_FORMAT_L_LATC1;
-   case GL_COMPRESSED_SIGNED_LUMINANCE_LATC1_EXT:
-      return MESA_FORMAT_SIGNED_L_LATC1;
-   case GL_COMPRESSED_LUMINANCE_ALPHA_LATC2_EXT:
-   case GL_COMPRESSED_LUMINANCE_ALPHA_3DC_ATI:
-      return MESA_FORMAT_LA_LATC2;
-   case GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT:
-      return MESA_FORMAT_SIGNED_LA_LATC2;
-
-   default:
-      return MESA_FORMAT_NONE;
-   }
-}
-
-
-/**
- * Given a compressed MESA_FORMAT_x value, return the corresponding
- * GLenum for that format.
- * This is needed for glGetTexLevelParameter(GL_TEXTURE_INTERNAL_FORMAT)
- * which must return the specific texture format used when the user might
- * have originally specified a generic compressed format in their
- * glTexImage2D() call.
- * For non-compressed textures, we always return the user-specified
- * internal format unchanged.
- */
-GLenum
-_mesa_compressed_format_to_glenum(struct gl_context *ctx, GLuint mesaFormat)
-{
-   switch (mesaFormat) {
-#if FEATURE_texture_fxt1
-   case MESA_FORMAT_RGB_FXT1:
-      return GL_COMPRESSED_RGB_FXT1_3DFX;
-   case MESA_FORMAT_RGBA_FXT1:
-      return GL_COMPRESSED_RGBA_FXT1_3DFX;
-#endif
-#if FEATURE_texture_s3tc
-   case MESA_FORMAT_RGB_DXT1:
-      return GL_COMPRESSED_RGB_S3TC_DXT1_EXT;
-   case MESA_FORMAT_RGBA_DXT1:
-      return GL_COMPRESSED_RGBA_S3TC_DXT1_EXT;
-   case MESA_FORMAT_RGBA_DXT3:
-      return GL_COMPRESSED_RGBA_S3TC_DXT3_EXT;
-   case MESA_FORMAT_RGBA_DXT5:
-      return GL_COMPRESSED_RGBA_S3TC_DXT5_EXT;
-#if FEATURE_EXT_texture_sRGB
-   case MESA_FORMAT_SRGB_DXT1:
-      return GL_COMPRESSED_SRGB_S3TC_DXT1_EXT;
-   case MESA_FORMAT_SRGBA_DXT1:
-      return GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT;
-   case MESA_FORMAT_SRGBA_DXT3:
-      return GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT;
-   case MESA_FORMAT_SRGBA_DXT5:
-      return GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT;
-#endif
-#endif
-
-   case MESA_FORMAT_RED_RGTC1:
-      return GL_COMPRESSED_RED_RGTC1;
-   case MESA_FORMAT_SIGNED_RED_RGTC1:
-      return GL_COMPRESSED_SIGNED_RED_RGTC1;
-   case MESA_FORMAT_RG_RGTC2:
-      return GL_COMPRESSED_RG_RGTC2;
-   case MESA_FORMAT_SIGNED_RG_RGTC2:
-      return GL_COMPRESSED_SIGNED_RG_RGTC2;
-
-   case MESA_FORMAT_L_LATC1:
-      return GL_COMPRESSED_LUMINANCE_LATC1_EXT;
-   case MESA_FORMAT_SIGNED_L_LATC1:
-      return GL_COMPRESSED_SIGNED_LUMINANCE_LATC1_EXT;
-   case MESA_FORMAT_LA_LATC2:
-      return GL_COMPRESSED_LUMINANCE_ALPHA_LATC2_EXT;
-   case MESA_FORMAT_SIGNED_LA_LATC2:
-      return GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT;
-
-   default:
-      _mesa_problem(ctx, "Unexpected mesa texture format in"
-                    " _mesa_compressed_format_to_glenum()");
-      return 0;
-   }
-}
-
-
-/*
- * Return the address of the pixel at (col, row, img) in a
- * compressed texture image.
- * \param col, row, img - image position (3D), should be a multiple of the
- *                        format's block size.
- * \param format - compressed image format
- * \param width - image width (stride) in pixels
- * \param image - the image address
- * \return address of pixel at (row, col, img)
- */
-GLubyte *
-_mesa_compressed_image_address(GLint col, GLint row, GLint img,
-                               gl_format mesaFormat,
-                               GLsizei width, const GLubyte *image)
-{
-   /* XXX only 2D images implemented, not 3D */
-   const GLuint blockSize = _mesa_get_format_bytes(mesaFormat);
-   GLuint bw, bh;
-   GLint offset;
-
-   _mesa_get_format_block_size(mesaFormat, &bw, &bh);
-
-   ASSERT(col % bw == 0);
-   ASSERT(row % bh == 0);
-
-   offset = ((width + bw - 1) / bw) * (row / bh) + col / bw;
-   offset *= blockSize;
-
-   return (GLubyte *) image + offset;
-}
+/*
+ * Mesa 3-D graphics library
+ * Version:  6.5.1
+ *
+ * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
+ * Copyright (c) 2008 VMware, 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.
+ */
+
+
+/**
+ * \file texcompress.c
+ * Helper functions for texture compression.
+ */
+
+
+#include "glheader.h"
+#include "imports.h"
+#include "colormac.h"
+#include "formats.h"
+#include "mfeatures.h"
+#include "mtypes.h"
+#include "texcompress.h"
+
+
+/**
+ * Return list of (and count of) all specific texture compression
+ * formats that are supported.
+ *
+ * \param ctx  the GL context
+ * \param formats  the resulting format list (may be NULL).
+ * \param all  if true return all formats, even those with  some kind
+ *             of restrictions/limitations (See GL_ARB_texture_compression
+ *             spec for more info).
+ *
+ * \return number of formats.
+ */
+GLuint
+_mesa_get_compressed_formats(struct gl_context *ctx, GLint *formats, GLboolean all)
+{
+   GLuint n = 0;
+   if (ctx->Extensions.TDFX_texture_compression_FXT1) {
+      if (formats) {
+         formats[n++] = GL_COMPRESSED_RGB_FXT1_3DFX;
+         formats[n++] = GL_COMPRESSED_RGBA_FXT1_3DFX;
+      }
+      else {
+         n += 2;
+      }
+   }
+   /* don't return RGTC - ARB_texture_compression_rgtc query 19 */
+   if (ctx->Extensions.EXT_texture_compression_s3tc) {
+      if (formats) {
+         formats[n++] = GL_COMPRESSED_RGB_S3TC_DXT1_EXT;
+         /* This format has some restrictions/limitations and so should
+          * not be returned via the GL_COMPRESSED_TEXTURE_FORMATS query.
+          * Specifically, all transparent pixels become black.  NVIDIA
+          * omits this format too.
+          */
+         if (all)
+             formats[n++] = GL_COMPRESSED_RGBA_S3TC_DXT1_EXT;
+         formats[n++] = GL_COMPRESSED_RGBA_S3TC_DXT3_EXT;
+         formats[n++] = GL_COMPRESSED_RGBA_S3TC_DXT5_EXT;
+      }
+      else {
+         n += 3;
+         if (all)
+             n += 1;
+      }
+   }
+   if (ctx->Extensions.S3_s3tc) {
+      if (formats) {
+         formats[n++] = GL_RGB_S3TC;
+         formats[n++] = GL_RGB4_S3TC;
+         formats[n++] = GL_RGBA_S3TC;
+         formats[n++] = GL_RGBA4_S3TC;
+      }
+      else {
+         n += 4;
+      }
+   }
+#if FEATURE_EXT_texture_sRGB
+   if (ctx->Extensions.EXT_texture_sRGB) {
+      if (formats) {
+         formats[n++] = GL_COMPRESSED_SRGB_S3TC_DXT1_EXT;
+         formats[n++] = GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT;
+         formats[n++] = GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT;
+         formats[n++] = GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT;
+      }
+      else {
+         n += 4;
+      }
+   }
+#endif /* FEATURE_EXT_texture_sRGB */
+   return n;
+
+#if FEATURE_ES1 || FEATURE_ES2
+   if (formats) {
+      formats[n++] = GL_PALETTE4_RGB8_OES;
+      formats[n++] = GL_PALETTE4_RGBA8_OES;
+      formats[n++] = GL_PALETTE4_R5_G6_B5_OES;
+      formats[n++] = GL_PALETTE4_RGBA4_OES;
+      formats[n++] = GL_PALETTE4_RGB5_A1_OES;
+      formats[n++] = GL_PALETTE8_RGB8_OES;
+      formats[n++] = GL_PALETTE8_RGBA8_OES;
+      formats[n++] = GL_PALETTE8_R5_G6_B5_OES;
+      formats[n++] = GL_PALETTE8_RGBA4_OES;
+      formats[n++] = GL_PALETTE8_RGB5_A1_OES;
+   }
+   else {
+      n += 10;
+   }
+#endif
+}
+
+
+/**
+ * Convert a compressed MESA_FORMAT_x to a GLenum.
+ */
+gl_format
+_mesa_glenum_to_compressed_format(GLenum format)
+{
+   switch (format) {
+   case GL_COMPRESSED_RGB_FXT1_3DFX:
+      return MESA_FORMAT_RGB_FXT1;
+   case GL_COMPRESSED_RGBA_FXT1_3DFX:
+      return MESA_FORMAT_RGBA_FXT1;
+
+   case GL_COMPRESSED_RGB_S3TC_DXT1_EXT:
+   case GL_RGB_S3TC:
+      return MESA_FORMAT_RGB_DXT1;
+   case GL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
+   case GL_RGB4_S3TC:
+      return MESA_FORMAT_RGBA_DXT1;
+   case GL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
+   case GL_RGBA_S3TC:
+      return MESA_FORMAT_RGBA_DXT3;
+   case GL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
+   case GL_RGBA4_S3TC:
+      return MESA_FORMAT_RGBA_DXT5;
+
+   case GL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
+      return MESA_FORMAT_SRGB_DXT1;
+   case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
+      return MESA_FORMAT_SRGBA_DXT1;
+   case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
+      return MESA_FORMAT_SRGBA_DXT3;
+   case GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
+      return MESA_FORMAT_SRGBA_DXT5;
+
+   case GL_COMPRESSED_RED_RGTC1:
+      return MESA_FORMAT_RED_RGTC1;
+   case GL_COMPRESSED_SIGNED_RED_RGTC1:
+      return MESA_FORMAT_SIGNED_RED_RGTC1;
+   case GL_COMPRESSED_RG_RGTC2:
+      return MESA_FORMAT_RG_RGTC2;
+   case GL_COMPRESSED_SIGNED_RG_RGTC2:
+      return MESA_FORMAT_SIGNED_RG_RGTC2;
+
+   case GL_COMPRESSED_LUMINANCE_LATC1_EXT:
+      return MESA_FORMAT_L_LATC1;
+   case GL_COMPRESSED_SIGNED_LUMINANCE_LATC1_EXT:
+      return MESA_FORMAT_SIGNED_L_LATC1;
+   case GL_COMPRESSED_LUMINANCE_ALPHA_LATC2_EXT:
+   case GL_COMPRESSED_LUMINANCE_ALPHA_3DC_ATI:
+      return MESA_FORMAT_LA_LATC2;
+   case GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT:
+      return MESA_FORMAT_SIGNED_LA_LATC2;
+
+   default:
+      return MESA_FORMAT_NONE;
+   }
+}
+
+
+/**
+ * Given a compressed MESA_FORMAT_x value, return the corresponding
+ * GLenum for that format.
+ * This is needed for glGetTexLevelParameter(GL_TEXTURE_INTERNAL_FORMAT)
+ * which must return the specific texture format used when the user might
+ * have originally specified a generic compressed format in their
+ * glTexImage2D() call.
+ * For non-compressed textures, we always return the user-specified
+ * internal format unchanged.
+ */
+GLenum
+_mesa_compressed_format_to_glenum(struct gl_context *ctx, GLuint mesaFormat)
+{
+   switch (mesaFormat) {
+#if FEATURE_texture_fxt1
+   case MESA_FORMAT_RGB_FXT1:
+      return GL_COMPRESSED_RGB_FXT1_3DFX;
+   case MESA_FORMAT_RGBA_FXT1:
+      return GL_COMPRESSED_RGBA_FXT1_3DFX;
+#endif
+#if FEATURE_texture_s3tc
+   case MESA_FORMAT_RGB_DXT1:
+      return GL_COMPRESSED_RGB_S3TC_DXT1_EXT;
+   case MESA_FORMAT_RGBA_DXT1:
+      return GL_COMPRESSED_RGBA_S3TC_DXT1_EXT;
+   case MESA_FORMAT_RGBA_DXT3:
+      return GL_COMPRESSED_RGBA_S3TC_DXT3_EXT;
+   case MESA_FORMAT_RGBA_DXT5:
+      return GL_COMPRESSED_RGBA_S3TC_DXT5_EXT;
+#if FEATURE_EXT_texture_sRGB
+   case MESA_FORMAT_SRGB_DXT1:
+      return GL_COMPRESSED_SRGB_S3TC_DXT1_EXT;
+   case MESA_FORMAT_SRGBA_DXT1:
+      return GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT;
+   case MESA_FORMAT_SRGBA_DXT3:
+      return GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT;
+   case MESA_FORMAT_SRGBA_DXT5:
+      return GL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT;
+#endif
+#endif
+
+   case MESA_FORMAT_RED_RGTC1:
+      return GL_COMPRESSED_RED_RGTC1;
+   case MESA_FORMAT_SIGNED_RED_RGTC1:
+      return GL_COMPRESSED_SIGNED_RED_RGTC1;
+   case MESA_FORMAT_RG_RGTC2:
+      return GL_COMPRESSED_RG_RGTC2;
+   case MESA_FORMAT_SIGNED_RG_RGTC2:
+      return GL_COMPRESSED_SIGNED_RG_RGTC2;
+
+   case MESA_FORMAT_L_LATC1:
+      return GL_COMPRESSED_LUMINANCE_LATC1_EXT;
+   case MESA_FORMAT_SIGNED_L_LATC1:
+      return GL_COMPRESSED_SIGNED_LUMINANCE_LATC1_EXT;
+   case MESA_FORMAT_LA_LATC2:
+      return GL_COMPRESSED_LUMINANCE_ALPHA_LATC2_EXT;
+   case MESA_FORMAT_SIGNED_LA_LATC2:
+      return GL_COMPRESSED_SIGNED_LUMINANCE_ALPHA_LATC2_EXT;
+
+   default:
+      _mesa_problem(ctx, "Unexpected mesa texture format in"
+                    " _mesa_compressed_format_to_glenum()");
+      return 0;
+   }
+}
+
+
+/*
+ * Return the address of the pixel at (col, row, img) in a
+ * compressed texture image.
+ * \param col, row, img - image position (3D), should be a multiple of the
+ *                        format's block size.
+ * \param format - compressed image format
+ * \param width - image width (stride) in pixels
+ * \param image - the image address
+ * \return address of pixel at (row, col, img)
+ */
+GLubyte *
+_mesa_compressed_image_address(GLint col, GLint row, GLint img,
+                               gl_format mesaFormat,
+                               GLsizei width, const GLubyte *image)
+{
+   /* XXX only 2D images implemented, not 3D */
+   const GLuint blockSize = _mesa_get_format_bytes(mesaFormat);
+   GLuint bw, bh;
+   GLint offset;
+
+   _mesa_get_format_block_size(mesaFormat, &bw, &bh);
+
+   ASSERT(col % bw == 0);
+   ASSERT(row % bh == 0);
+
+   offset = ((width + bw - 1) / bw) * (row / bh) + col / bw;
+   offset *= blockSize;
+
+   return (GLubyte *) image + offset;
+}