Merge branch 'gallium-s3tc'

9 files changed, 480 insertions, 16 deletions

diff --git a/progs/tests/texcompress2.c b/progs/tests/texcompress2.c
index cbb8f1d3a2..b95aca9fb9 100644
--- a/progs/tests/texcompress2.c
+++ b/progs/tests/texcompress2.c
@@ -51,7 +51,6 @@ TestSubTex(void)
    GLboolean all = 0*GL_TRUE;
    GLubyte *buffer;
    GLint size, fmt;
-   int i;
 
    glGetTexLevelParameteriv(Target, 0,
                             GL_TEXTURE_COMPRESSED_IMAGE_SIZE_ARB, &size);
@@ -83,6 +82,23 @@ TestSubTex(void)
 
 
 static void
+TestGetTex(void)
+{
+   GLubyte *buffer;
+
+   buffer = (GLubyte *) malloc(3 * ImgWidth * ImgHeight);
+
+   glGetTexImage(GL_TEXTURE_2D,
+                 0,
+                 GL_RGB,
+                 GL_UNSIGNED_BYTE,
+                 buffer);
+
+   free(buffer);
+}
+
+
+static void
 LoadCompressedImage(const char *file)
 {
    const GLenum filter = GL_LINEAR;
@@ -146,7 +162,10 @@ LoadCompressedImage(const char *file)
    glTexParameteri(Target, GL_TEXTURE_MIN_FILTER, filter);
    glTexParameteri(Target, GL_TEXTURE_MAG_FILTER, filter);
 
-   TestSubTex();
+   if (0)
+      TestSubTex();
+   else
+      TestGetTex();
 
 }
 
diff --git a/src/gallium/auxiliary/util/Makefile b/src/gallium/auxiliary/util/Makefile
index 5035e9cc13..2995aba1b9 100644
--- a/src/gallium/auxiliary/util/Makefile
+++ b/src/gallium/auxiliary/util/Makefile
@@ -23,6 +23,7 @@ C_SOURCES = \
 	u_snprintf.c \
 	u_stream_stdc.c \
 	u_stream_wd.c \
+	u_surface.c \
 	u_tile.c \
 	u_time.c \
 	u_timed_winsys.c \
diff --git a/src/gallium/auxiliary/util/SConscript b/src/gallium/auxiliary/util/SConscript
index 8317263bb8..d3ac7f747f 100644
--- a/src/gallium/auxiliary/util/SConscript
+++ b/src/gallium/auxiliary/util/SConscript
@@ -24,6 +24,7 @@ util = env.ConvenienceLibrary(
 		'u_snprintf.c',
 		'u_stream_stdc.c',
 		'u_stream_wd.c',
+		'u_surface.c',
 		'u_tile.c',
 		'u_time.c',
 		'u_timed_winsys.c',
diff --git a/src/gallium/auxiliary/util/u_surface.c b/src/gallium/auxiliary/util/u_surface.c
new file mode 100644
index 0000000000..85e443204e
--- /dev/null
+++ b/src/gallium/auxiliary/util/u_surface.c
@@ -0,0 +1,113 @@
+/**************************************************************************
+ *
+ * Copyright 2009 VMware, 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 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 NON-INFRINGEMENT.
+ * IN NO EVENT SHALL VMWARE 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.
+ *
+ **************************************************************************/
+
+/**
+ * @file
+ * Surface utility functions.
+ *  
+ * @author Brian Paul
+ */
+
+
+#include "pipe/p_screen.h"
+#include "pipe/p_state.h"
+#include "pipe/p_defines.h"
+
+#include "util/u_surface.h"
+
+
+/**
+ * Helper to quickly create an RGBA rendering surface of a certain size.
+ * \param textureOut  returns the new texture
+ * \param surfaceOut  returns the new surface
+ * \return TRUE for success, FALSE if failure
+ */
+boolean
+util_create_rgba_surface(struct pipe_screen *screen,
+                         uint width, uint height,
+                         struct pipe_texture **textureOut,
+                         struct pipe_surface **surfaceOut)
+{
+   static const enum pipe_format rgbaFormats[] = {
+      PIPE_FORMAT_A8R8G8B8_UNORM,
+      PIPE_FORMAT_B8G8R8A8_UNORM,
+      PIPE_FORMAT_R8G8B8A8_UNORM,
+      PIPE_FORMAT_NONE
+   };
+   const uint target = PIPE_TEXTURE_2D;
+   const uint usage = PIPE_TEXTURE_USAGE_RENDER_TARGET;
+   enum pipe_format format = PIPE_FORMAT_NONE;
+   struct pipe_texture templ;
+   uint i;
+
+   /* Choose surface format */
+   for (i = 0; rgbaFormats[i]; i++) {
+      if (screen->is_format_supported(screen, rgbaFormats[i],
+                                      target, usage, 0)) {
+         format = rgbaFormats[i];
+         break;
+      }
+   }
+   if (format == PIPE_FORMAT_NONE)
+      return FALSE;  /* unable to get an rgba format!?! */
+
+   /* create texture */
+   memset(&templ, 0, sizeof(templ));
+   templ.target = target;
+   templ.format = format;
+   templ.last_level = 0;
+   templ.width[0] = width;
+   templ.height[0] = height;
+   templ.depth[0] = 1;
+   pf_get_block(format, &templ.block);
+   templ.tex_usage = usage;
+
+   *textureOut = screen->texture_create(screen, &templ);
+   if (!*textureOut)
+      return FALSE;
+
+   /* create surface / view into texture */
+   *surfaceOut = screen->get_tex_surface(screen, *textureOut, 0, 0, 0, PIPE_BUFFER_USAGE_GPU_WRITE);
+   if (!*surfaceOut) {
+      pipe_texture_reference(textureOut, NULL);
+      return FALSE;
+   }
+
+   return TRUE;
+}
+
+
+/**
+ * Release the surface and texture from util_create_rgba_surface().
+ */
+void
+util_destroy_rgba_surface(struct pipe_texture *texture,
+                          struct pipe_surface *surface)
+{
+   pipe_surface_reference(&surface, NULL);
+   pipe_texture_reference(&texture, NULL);
+}
+
diff --git a/src/gallium/auxiliary/util/u_surface.h b/src/gallium/auxiliary/util/u_surface.h
new file mode 100644
index 0000000000..a5b73cfc20
--- /dev/null
+++ b/src/gallium/auxiliary/util/u_surface.h
@@ -0,0 +1,52 @@
+/**************************************************************************
+ *
+ * Copyright 2009 VMware, 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 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 NON-INFRINGEMENT.
+ * IN NO EVENT SHALL VMWARE 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.
+ *
+ **************************************************************************/
+
+
+#ifndef U_SURFACE_H
+#define U_SURFACE_H
+
+
+#include "pipe/p_compiler.h"
+
+
+struct pipe_screen;
+struct pipe_texture;
+struct pipe_surface;
+
+
+extern boolean
+util_create_rgba_surface(struct pipe_screen *screen,
+                         uint width, uint height,
+                         struct pipe_texture **textureOut,
+                         struct pipe_surface **surfaceOut);
+
+
+extern void
+util_destroy_rgba_surface(struct pipe_texture *texture,
+                          struct pipe_surface *surface);
+
+
+#endif /* U_SURFACE_H */
diff --git a/src/mesa/main/texcompress_s3tc.c b/src/mesa/main/texcompress_s3tc.c
index d17e18da6b..a1c0f18f36 100644
--- a/src/mesa/main/texcompress_s3tc.c
+++ b/src/mesa/main/texcompress_s3tc.c
@@ -205,7 +205,7 @@ texstore_rgb_dxt1(TEXSTORE_PARAMS)
                               dst, dstRowStride);
    }
    else {
-      _mesa_warning(ctx, "external dxt library not available");
+      _mesa_warning(ctx, "external dxt library not available: texstore_rgb_dxt1");
    }
 
    if (tempImage)
@@ -267,7 +267,7 @@ texstore_rgba_dxt1(TEXSTORE_PARAMS)
                               dst, dstRowStride);
    }
    else {
-      _mesa_warning(ctx, "external dxt library not available");
+      _mesa_warning(ctx, "external dxt library not available: texstore_rgba_dxt1");
    }
 
    if (tempImage)
@@ -328,7 +328,7 @@ texstore_rgba_dxt3(TEXSTORE_PARAMS)
                               dst, dstRowStride);
    }
    else {
-      _mesa_warning(ctx, "external dxt library not available");
+      _mesa_warning(ctx, "external dxt library not available: texstore_rgba_dxt3");
    }
 
    if (tempImage)
@@ -389,7 +389,7 @@ texstore_rgba_dxt5(TEXSTORE_PARAMS)
                               dst, dstRowStride);
    }
    else {
-      _mesa_warning(ctx, "external dxt library not available");
+      _mesa_warning(ctx, "external dxt library not available: texstore_rgba_dxt5");
    }
 
    if (tempImage)
@@ -410,7 +410,7 @@ fetch_texel_2d_rgb_dxt1( const struct gl_texture_image *texImage,
                          (GLubyte *)(texImage)->Data, i, j, texel);
    }
    else
-      _mesa_debug(NULL, "attempted to decode s3tc texture without library available\n");
+      _mesa_debug(NULL, "attempted to decode s3tc texture without library available: fetch_texel_2d_rgb_dxt1");
 }
 
 
@@ -438,7 +438,7 @@ fetch_texel_2d_rgba_dxt1( const struct gl_texture_image *texImage,
                           (GLubyte *)(texImage)->Data, i, j, texel);
    }
    else
-      _mesa_debug(NULL, "attempted to decode s3tc texture without library available\n");
+      _mesa_debug(NULL, "attempted to decode s3tc texture without library available: fetch_texel_2d_rgba_dxt1\n");
 }
 
 
@@ -467,7 +467,7 @@ fetch_texel_2d_rgba_dxt3( const struct gl_texture_image *texImage,
                           i, j, texel);
    }
    else
-      _mesa_debug(NULL, "attempted to decode s3tc texture without library available\n");
+      _mesa_debug(NULL, "attempted to decode s3tc texture without library available: fetch_texel_2d_rgba_dxt3\n");
 }
 
 
@@ -495,7 +495,7 @@ fetch_texel_2d_rgba_dxt5( const struct gl_texture_image *texImage,
                           i, j, texel);
    }
    else
-      _mesa_debug(NULL, "attempted to decode s3tc texture without library available\n");
+      _mesa_debug(NULL, "attempted to decode s3tc texture without library available: fetch_texel_2d_rgba_dxt5\n");
 }
 
 
diff --git a/src/mesa/state_tracker/st_cb_texture.c b/src/mesa/state_tracker/st_cb_texture.c
index 727432d7de..98dc6ec74d 100644
--- a/src/mesa/state_tracker/st_cb_texture.c
+++ b/src/mesa/state_tracker/st_cb_texture.c
@@ -26,6 +26,7 @@
  **************************************************************************/
 
 #include "main/mfeatures.h"
+#include "main/bufferobj.h"
 #if FEATURE_convolve
 #include "main/convolve.h"
 #endif
@@ -55,6 +56,7 @@
 #include "pipe/p_inlines.h"
 #include "util/u_tile.h"
 #include "util/u_blit.h"
+#include "util/u_surface.h"
 
 
 #define DBG if (0) printf
@@ -110,6 +112,25 @@ compressed_num_bytes(GLuint mesaFormat)
 }
 
 
+static GLboolean
+is_compressed_mesa_format(const struct gl_texture_format *format)
+{
+   switch (format->MesaFormat) {
+   case MESA_FORMAT_RGB_DXT1:
+   case MESA_FORMAT_RGBA_DXT1:
+   case MESA_FORMAT_RGBA_DXT3:
+   case MESA_FORMAT_RGBA_DXT5:
+   case MESA_FORMAT_SRGB_DXT1:
+   case MESA_FORMAT_SRGBA_DXT1:
+   case MESA_FORMAT_SRGBA_DXT3:
+   case MESA_FORMAT_SRGBA_DXT5:
+      return GL_TRUE;
+   default:
+      return GL_FALSE;
+   }
+}
+
+
 /** called via ctx->Driver.NewTextureImage() */
 static struct gl_texture_image *
 st_NewTextureImage(GLcontext * ctx)
@@ -379,6 +400,110 @@ strip_texture_border(GLint border,
 
 
 /**
+ * Try to do texture compression via rendering.  If the Gallium driver
+ * can render into a compressed surface this will allow us to do texture
+ * compression.
+ * \return GL_TRUE for success, GL_FALSE for failure
+ */
+static GLboolean
+compress_with_blit(GLcontext * ctx,
+                   GLenum target, GLint level,
+                   GLint xoffset, GLint yoffset, GLint zoffset,
+                   GLint width, GLint height, GLint depth,
+                   GLenum format, GLenum type, const void *pixels,
+                   const struct gl_pixelstore_attrib *unpack,
+                   struct gl_texture_image *texImage)
+{
+   const GLuint dstImageOffsets[1] = {0};
+   struct st_texture_image *stImage = st_texture_image(texImage);
+   struct pipe_screen *screen = ctx->st->pipe->screen;
+   const GLuint face = _mesa_tex_target_to_face(target);
+   const struct gl_texture_format *mesa_format;
+   struct pipe_texture templ;
+   struct pipe_texture *src_tex;
+   struct pipe_surface *dst_surface;
+   struct pipe_transfer *tex_xfer;
+   void *map;
+
+
+   if (!stImage->pt) {
+      /* XXX: Can this happen? Should we assert? */
+      return GL_FALSE;
+   }
+
+   /* get destination surface (in the compressed texture) */
+   dst_surface = screen->get_tex_surface(screen, stImage->pt,
+                                         stImage->face, stImage->level, 0,
+                                         PIPE_BUFFER_USAGE_GPU_WRITE);
+   if (!dst_surface) {
+      /* can't render into this format (or other problem) */
+      return GL_FALSE;
+   }
+
+   /* Choose format for the temporary RGBA texture image.
+    */
+   mesa_format = st_ChooseTextureFormat(ctx, GL_RGBA, format, type);
+   assert(mesa_format);
+   if (!mesa_format)
+      return GL_FALSE;
+
+   /* Create the temporary source texture
+    */
+   memset(&templ, 0, sizeof(templ));
+   templ.target = PIPE_TEXTURE_2D;
+   templ.format = st_mesa_format_to_pipe_format(mesa_format->MesaFormat);
+   pf_get_block(templ.format, &templ.block);
+   templ.width[0] = width;
+   templ.height[0] = height;
+   templ.depth[0] = 1;
+   templ.last_level = 0;
+   templ.tex_usage = PIPE_TEXTURE_USAGE_SAMPLER;
+   src_tex = screen->texture_create(screen, &templ);
+
+   if (!src_tex)
+      return GL_FALSE;
+
+   /* Put user's tex data into the temporary texture
+    */
+   tex_xfer = screen->get_tex_transfer(screen, src_tex,
+                                       face, level, 0,
+                                       PIPE_TRANSFER_WRITE,
+                                       0, 0, width, height); /* x, y, w, h */
+   map = screen->transfer_map(screen, tex_xfer);
+
+   mesa_format->StoreImage(ctx, 2, GL_RGBA, mesa_format,
+                           map,              /* dest ptr */
+                           0, 0, 0,          /* dest x/y/z offset */
+                           tex_xfer->stride, /* dest row stride (bytes) */
+                           dstImageOffsets,  /* image offsets (for 3D only) */
+                           width, height, 1, /* size */
+                           format, type,     /* source format/type */
+                           pixels,           /* source data */
+                           unpack);          /* source data packing */
+
+   screen->transfer_unmap(screen, tex_xfer);
+   screen->tex_transfer_destroy(tex_xfer);
+
+   /* copy / compress image */
+   util_blit_pixels_tex(ctx->st->blit,
+                        src_tex,          /* pipe_texture (src) */
+                        0, 0,             /* src x0, y0 */
+                        width, height,    /* src x1, y1 */
+                        dst_surface,      /* pipe_surface (dst) */
+                        xoffset, yoffset, /* dst x0, y0 */
+                        xoffset + width,  /* dst x1 */
+                        yoffset + height, /* dst y1 */
+                        0.0,              /* z */
+                        PIPE_TEX_MIPFILTER_NEAREST);
+
+   pipe_surface_reference(&dst_surface, NULL);
+   pipe_texture_reference(&src_tex, NULL);
+
+   return GL_TRUE;
+}
+
+
+/**
  * Do glTexImage1/2/3D().
  */
 static void
@@ -392,8 +517,9 @@ st_TexImage(GLcontext * ctx,
             const struct gl_pixelstore_attrib *unpack,
             struct gl_texture_object *texObj,
             struct gl_texture_image *texImage,
-            GLsizei imageSize, GLboolean compressed)
+            GLsizei imageSize, GLboolean compressed_src)
 {
+   struct pipe_screen *screen = ctx->st->pipe->screen;
    struct st_texture_object *stObj = st_texture_object(texObj);
    struct st_texture_image *stImage = st_texture_image(texImage);
    GLint postConvWidth, postConvHeight;
@@ -522,7 +648,7 @@ st_TexImage(GLcontext * ctx,
     * the expectation that the texture will be set up but nothing
     * more will be done.  This is where those calls return:
     */
-   if (compressed) {
+   if (compressed_src) {
       pixels = _mesa_validate_pbo_compressed_teximage(ctx, imageSize, pixels,
 						      unpack,
 						      "glCompressedTexImage");
@@ -535,6 +661,21 @@ st_TexImage(GLcontext * ctx,
    if (!pixels)
       return;
 
+   /* See if we can do texture compression with a blit/render.
+    */
+   if (!compressed_src &&
+       !ctx->Mesa_DXTn &&
+       is_compressed_mesa_format(texImage->TexFormat) &&
+       screen->is_format_supported(screen,
+                                   stImage->pt->format,
+                                   stImage->pt->target,
+                                   PIPE_TEXTURE_USAGE_RENDER_TARGET, 0)) {
+      if (compress_with_blit(ctx, target, level, 0, 0, 0, width, height, depth,
+                             format, type, pixels, unpack, texImage)) {
+         return;
+      }
+   }
+
    if (stImage->pt) {
       texImage->Data = st_texture_image_map(ctx->st, stImage, 0,
                                             PIPE_TRANSFER_WRITE, 0, 0,
@@ -570,7 +711,7 @@ st_TexImage(GLcontext * ctx,
     * the blitter to copy.  Or, use the hardware to do the format
     * conversion and copy:
     */
-   if (compressed) {
+   if (compressed_src) {
       memcpy(texImage->Data, pixels, imageSize);
    }
    else {
@@ -607,7 +748,7 @@ st_TexImage(GLcontext * ctx,
 
    _mesa_unmap_teximage_pbo(ctx, unpack);
 
-   if (stImage->pt) {
+   if (stImage->pt && texImage->Data) {
       st_texture_image_unmap(ctx->st, stImage);
       texImage->Data = NULL;
    }
@@ -678,6 +819,90 @@ st_CompressedTexImage2D(GLcontext *ctx, GLenum target, GLint level,
 }
 
 
+
+/**
+ * glGetTexImage() helper: decompress a compressed texture by rendering
+ * a textured quad.  Store the results in the user's buffer.
+ */
+static void
+decompress_with_blit(GLcontext * ctx, GLenum target, GLint level,
+                     GLenum format, GLenum type, GLvoid *pixels,
+                     struct gl_texture_object *texObj,
+                     struct gl_texture_image *texImage)
+{
+   struct pipe_screen *screen = ctx->st->pipe->screen;
+   struct st_texture_image *stImage = st_texture_image(texImage);
+   const GLuint width = texImage->Width;
+   const GLuint height = texImage->Height;
+   struct pipe_surface *dst_surface;
+   struct pipe_texture *dst_texture;
+   struct pipe_transfer *tex_xfer;
+
+   /* create temp / dest surface */
+   if (!util_create_rgba_surface(screen, width, height,
+                                 &dst_texture, &dst_surface)) {
+      _mesa_problem(ctx, "util_create_rgba_surface() failed "
+                    "in decompress_with_blit()");
+      return;
+   }
+
+   /* blit/render/decompress */
+   util_blit_pixels_tex(ctx->st->blit,
+                        stImage->pt,      /* pipe_texture (src) */
+                        0, 0,             /* src x0, y0 */
+                        width, height,    /* src x1, y1 */
+                        dst_surface,      /* pipe_surface (dst) */
+                        0, 0,             /* dst x0, y0 */
+                        width, height,    /* dst x1, y1 */
+                        0.0,              /* z */
+                        PIPE_TEX_MIPFILTER_NEAREST);
+
+   /* map the dst_surface so we can read from it */
+   tex_xfer = screen->get_tex_transfer(screen, dst_texture, 0, 0, 0,
+                                       PIPE_TRANSFER_READ,
+                                       0, 0, width, height);
+
+   pixels = _mesa_map_readpix_pbo(ctx, &ctx->Pack, pixels);
+
+   /* copy/pack data into user buffer */
+   if (st_equal_formats(stImage->pt->format, format, type)) {
+      /* memcpy */
+      const uint bytesPerRow = width * pf_get_size(stImage->pt->format);
+      ubyte *map = screen->transfer_map(screen, tex_xfer);
+      GLuint row;
+      for (row = 0; row < height; row++) {
+         GLvoid *dest = _mesa_image_address2d(&ctx->Pack, pixels, width,
+                                              height, format, type, row, 0);
+         memcpy(dest, map, bytesPerRow);
+         map += tex_xfer->stride;
+      }
+      screen->transfer_unmap(screen, tex_xfer);
+   }
+   else {
+      /* format translation via floats */
+      GLuint row;
+      for (row = 0; row < height; row++) {
+         const GLbitfield transferOps = 0x0; /* bypassed for glGetTexImage() */
+         GLfloat rgba[4 * MAX_WIDTH];
+         GLvoid *dest = _mesa_image_address2d(&ctx->Pack, pixels, width,
+                                              height, format, type, row, 0);
+
+         /* get float[4] rgba row from surface */
+         pipe_get_tile_rgba(tex_xfer, 0, row, width, 1, rgba);
+
+         _mesa_pack_rgba_span_float(ctx, width, (GLfloat (*)[4]) rgba, format,
+                                    type, dest, &ctx->Pack, transferOps);
+      }
+   }
+
+   _mesa_unmap_readpix_pbo(ctx, &ctx->Pack);
+
+   /* destroy the temp / dest surface */
+   util_destroy_rgba_surface(dst_texture, dst_surface);
+}
+
+
+
 /**
  * Need to map texture image into memory before copying image data,
  * then unmap it.
@@ -686,7 +911,7 @@ static void
 st_get_tex_image(GLcontext * ctx, GLenum target, GLint level,
                  GLenum format, GLenum type, GLvoid * pixels,
                  struct gl_texture_object *texObj,
-                 struct gl_texture_image *texImage, GLboolean compressed)
+                 struct gl_texture_image *texImage, GLboolean compressed_dst)
 {
    struct st_texture_image *stImage = st_texture_image(texImage);
    const GLuint dstImageStride =
@@ -695,6 +920,18 @@ st_get_tex_image(GLcontext * ctx, GLenum target, GLint level,
    GLuint depth, i;
    GLubyte *dest;
 
+   if (stImage->pt &&
+       pf_is_compressed(stImage->pt->format) &&
+       !compressed_dst) {
+      /* Need to decompress the texture.
+       * We'll do this by rendering a textured quad.
+       * Note that we only expect RGBA formats (no Z/depth formats).
+       */
+      decompress_with_blit(ctx, target, level, format, type, pixels,
+                           texObj, texImage);
+      return;
+   }
+
    /* Map */
    if (stImage->pt) {
       /* Image is stored in hardware format in a buffer managed by the
@@ -728,7 +965,7 @@ st_get_tex_image(GLcontext * ctx, GLenum target, GLint level,
    dest = (GLubyte *) pixels;
 
    for (i = 0; i < depth; i++) {
-      if (compressed) {
+      if (compressed_dst) {
 	 _mesa_get_compressed_teximage(ctx, target, level, dest,
 				       texObj, texImage);
       }
@@ -791,6 +1028,7 @@ st_TexSubimage(GLcontext *ctx, GLint dims, GLenum target, GLint level,
                struct gl_texture_object *texObj,
                struct gl_texture_image *texImage)
 {
+   struct pipe_screen *screen = ctx->st->pipe->screen;
    struct st_texture_image *stImage = st_texture_image(texImage);
    GLuint dstRowStride;
    const GLuint srcImageStride =
@@ -808,6 +1046,22 @@ st_TexSubimage(GLcontext *ctx, GLint dims, GLenum target, GLint level,
    if (!pixels)
       return;
 
+   /* See if we can do texture compression with a blit/render.
+    */
+   if (!ctx->Mesa_DXTn &&
+       is_compressed_mesa_format(texImage->TexFormat) &&
+       screen->is_format_supported(screen,
+                                   stImage->pt->format,
+                                   stImage->pt->target,
+                                   PIPE_TEXTURE_USAGE_RENDER_TARGET, 0)) {
+      if (compress_with_blit(ctx, target, level,
+                             xoffset, yoffset, zoffset,
+                             width, height, depth,
+                             format, type, pixels, packing, texImage)) {
+         return;
+      }
+   }
+
    /* Map buffer if necessary.  Need to lock to prevent other contexts
     * from uploading the buffer under us.
     */
diff --git a/src/mesa/state_tracker/st_format.c b/src/mesa/state_tracker/st_format.c
index 9e2d60c926..d507e3e58d 100644
--- a/src/mesa/state_tracker/st_format.c
+++ b/src/mesa/state_tracker/st_format.c
@@ -716,3 +716,23 @@ st_ChooseTextureFormat(GLcontext *ctx, GLint internalFormat,
 
    return translate_gallium_format_to_mesa_format(pFormat);
 }
+
+
+/**
+ * Test if a gallium format is equivalent to a GL format/type.
+ */
+GLboolean
+st_equal_formats(enum pipe_format pFormat, GLenum format, GLenum type)
+{
+   switch (pFormat) {
+   case PIPE_FORMAT_R8G8B8A8_UNORM:
+      return format == GL_RGBA && type == GL_UNSIGNED_BYTE;
+   case PIPE_FORMAT_B8G8R8A8_UNORM:
+      return format == GL_BGRA && type == GL_UNSIGNED_BYTE;
+   case PIPE_FORMAT_R5G6B5_UNORM:
+      return format == GL_RGB && type == GL_UNSIGNED_SHORT_5_6_5;
+   /* XXX more combos... */
+   default:
+      return GL_FALSE;
+   }
+}
diff --git a/src/mesa/state_tracker/st_format.h b/src/mesa/state_tracker/st_format.h
index 3f5ac3201b..7bbbe2d570 100644
--- a/src/mesa/state_tracker/st_format.h
+++ b/src/mesa/state_tracker/st_format.h
@@ -76,4 +76,8 @@ st_ChooseTextureFormat(GLcontext * ctx, GLint internalFormat,
                        GLenum format, GLenum type);
 
 
+extern GLboolean
+st_equal_formats(enum pipe_format pFormat, GLenum format, GLenum type);
+
+
 #endif /* ST_CB_TEXIMAGE_H */