libX11 mesa mkfontscale pixman xserver git update 29 Mar 2011

1 files changed, 451 insertions, 451 deletions

diff --git a/mesalib/src/mesa/state_tracker/st_gen_mipmap.c b/mesalib/src/mesa/state_tracker/st_gen_mipmap.c
index 2c37c1107..b34794f1b 100644
--- a/mesalib/src/mesa/state_tracker/st_gen_mipmap.c
+++ b/mesalib/src/mesa/state_tracker/st_gen_mipmap.c
@@ -1,451 +1,451 @@
-/**************************************************************************

- * 

- * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.

- * 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 TUNGSTEN GRAPHICS 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.

- * 

- **************************************************************************/

-

-

-#include "main/imports.h"

-#include "main/mipmap.h"

-#include "main/teximage.h"

-

-#include "pipe/p_context.h"

-#include "pipe/p_defines.h"

-#include "util/u_inlines.h"

-#include "util/u_format.h"

-#include "util/u_gen_mipmap.h"

-

-#include "st_debug.h"

-#include "st_context.h"

-#include "st_texture.h"

-#include "st_gen_mipmap.h"

-#include "st_cb_texture.h"

-

-

-/**

- * one-time init for generate mipmap

- * XXX Note: there may be other times we need no-op/simple state like this.

- * In that case, some code refactoring would be good.

- */

-void

-st_init_generate_mipmap(struct st_context *st)

-{

-   st->gen_mipmap = util_create_gen_mipmap(st->pipe, st->cso_context);

-}

-

-

-void

-st_destroy_generate_mipmap(struct st_context *st)

-{

-   util_destroy_gen_mipmap(st->gen_mipmap);

-   st->gen_mipmap = NULL;

-}

-

-

-/**

- * Generate mipmap levels using hardware rendering.

- * \return TRUE if successful, FALSE if not possible

- */

-static boolean

-st_render_mipmap(struct st_context *st,

-                 GLenum target,

-                 struct st_texture_object *stObj,

-                 uint baseLevel, uint lastLevel)

-{

-   struct pipe_context *pipe = st->pipe;

-   struct pipe_screen *screen = pipe->screen;

-   struct pipe_sampler_view *psv = st_get_texture_sampler_view(stObj, pipe);

-   const uint face = _mesa_tex_target_to_face(target);

-

-   assert(psv->texture == stObj->pt);

-#if 0

-   assert(target != GL_TEXTURE_3D); /* implemented but untested */

-#endif

-

-   /* check if we can render in the texture's format */

-   /* XXX should probably kill this and always use util_gen_mipmap

-      since this implements a sw fallback as well */

-   if (!screen->is_format_supported(screen, psv->format, psv->texture->target,

-                                    0, PIPE_BIND_RENDER_TARGET)) {

-      return FALSE;

-   }

-

-   util_gen_mipmap(st->gen_mipmap, psv, face, baseLevel, lastLevel,

-                   PIPE_TEX_FILTER_LINEAR);

-

-   return TRUE;

-}

-

-

-/**

- * Helper function to decompress an image.  The result is a 32-bpp RGBA

- * image with stride==width.

- */

-static void

-decompress_image(enum pipe_format format, int datatype,

-                 const uint8_t *src, void *dst,

-                 unsigned width, unsigned height, unsigned src_stride)

-{

-   const struct util_format_description *desc = util_format_description(format);

-   const uint bw = util_format_get_blockwidth(format);

-   const uint bh = util_format_get_blockheight(format);

-   uint dst_stride = 4 * MAX2(width, bw);

-

-   if (datatype == GL_FLOAT) {

-      desc->unpack_rgba_float((float *)dst, dst_stride * sizeof(GLfloat), src, src_stride, width, height);

-      if (width < bw || height < bh) {

-	 float *dst_p = (float *)dst;

-	 /* We're decompressing an image smaller than the compression

-	  * block size.  We don't want garbage pixel values in the region

-	  * outside (width x height) so replicate pixels from the (width

-	  * x height) region to fill out the (bw x bh) block size.

-	  */

-	 uint x, y;

-	 for (y = 0; y < bh; y++) {

-	    for (x = 0; x < bw; x++) {

-	       if (x >= width || y >= height) {

-		  uint p = (y * bw + x) * 4;

-		  dst_p[p + 0] = dst_p[0];

-		  dst_p[p + 1] = dst_p[1];

-		  dst_p[p + 2] = dst_p[2];

-		  dst_p[p + 3] = dst_p[3];

-	       }

-	    }

-	 }

-      }

-   } else {

-      desc->unpack_rgba_8unorm((uint8_t *)dst, dst_stride, src, src_stride, width, height);

-      if (width < bw || height < bh) {

-	 uint8_t *dst_p = (uint8_t *)dst;

-	 /* We're decompressing an image smaller than the compression

-	  * block size.  We don't want garbage pixel values in the region

-	  * outside (width x height) so replicate pixels from the (width

-	  * x height) region to fill out the (bw x bh) block size.

-	  */

-	 uint x, y;

-	 for (y = 0; y < bh; y++) {

-	    for (x = 0; x < bw; x++) {

-	       if (x >= width || y >= height) {

-		  uint p = (y * bw + x) * 4;

-		  dst_p[p + 0] = dst_p[0];

-		  dst_p[p + 1] = dst_p[1];

-		  dst_p[p + 2] = dst_p[2];

-		  dst_p[p + 3] = dst_p[3];

-	       }

-	    }

-	 }

-      }

-   }

-}

-

-/**

- * Helper function to compress an image.  The source is a 32-bpp RGBA image

- * with stride==width.

- */

-static void

-compress_image(enum pipe_format format, int datatype,

-               const void *src, uint8_t *dst,

-               unsigned width, unsigned height, unsigned dst_stride)

-{

-   const struct util_format_description *desc = util_format_description(format);

-   const uint src_stride = 4 * width;

-

-   if (datatype == GL_FLOAT)

-      desc->pack_rgba_float(dst, dst_stride, (GLfloat *)src, src_stride * sizeof(GLfloat), width, height);

-   else

-      desc->pack_rgba_8unorm(dst, dst_stride, (uint8_t *)src, src_stride, width, height);

-}

-

-

-/**

- * Software fallback for generate mipmap levels.

- */

-static void

-fallback_generate_mipmap(struct gl_context *ctx, GLenum target,

-                         struct gl_texture_object *texObj)

-{

-   struct pipe_context *pipe = st_context(ctx)->pipe;

-   struct pipe_resource *pt = st_get_texobj_resource(texObj);

-   const uint baseLevel = texObj->BaseLevel;

-   const uint lastLevel = pt->last_level;

-   const uint face = _mesa_tex_target_to_face(target);

-   uint dstLevel;

-   GLenum datatype;

-   GLuint comps;

-   GLboolean compressed;

-

-   if (ST_DEBUG & DEBUG_FALLBACK)

-      debug_printf("%s: fallback processing\n", __FUNCTION__);

-

-   assert(target != GL_TEXTURE_3D); /* not done yet */

-

-   compressed =

-      _mesa_is_format_compressed(texObj->Image[face][baseLevel]->TexFormat);

-

-   if (compressed) {

-      GLenum type =

-         _mesa_get_format_datatype(texObj->Image[face][baseLevel]->TexFormat);

-

-      datatype = type == GL_UNSIGNED_NORMALIZED ? GL_UNSIGNED_BYTE : GL_FLOAT;

-      comps = 4;

-   }

-   else {

-      _mesa_format_to_type_and_comps(texObj->Image[face][baseLevel]->TexFormat,

-                                     &datatype, &comps);

-      assert(comps > 0 && "bad texture format in fallback_generate_mipmap()");

-   }

-

-   for (dstLevel = baseLevel + 1; dstLevel <= lastLevel; dstLevel++) {

-      const uint srcLevel = dstLevel - 1;

-      const uint srcWidth = u_minify(pt->width0, srcLevel);

-      const uint srcHeight = u_minify(pt->height0, srcLevel);

-      const uint srcDepth = u_minify(pt->depth0, srcLevel);

-      const uint dstWidth = u_minify(pt->width0, dstLevel);

-      const uint dstHeight = u_minify(pt->height0, dstLevel);

-      const uint dstDepth = u_minify(pt->depth0, dstLevel);

-      struct pipe_transfer *srcTrans, *dstTrans;

-      const ubyte *srcData;

-      ubyte *dstData;

-      int srcStride, dstStride;

-

-      srcTrans = pipe_get_transfer(st_context(ctx)->pipe, pt, srcLevel,

-                                   face,

-                                   PIPE_TRANSFER_READ, 0, 0,

-                                   srcWidth, srcHeight);

-

-      dstTrans = pipe_get_transfer(st_context(ctx)->pipe, pt, dstLevel,

-                                   face,

-                                   PIPE_TRANSFER_WRITE, 0, 0,

-                                   dstWidth, dstHeight);

-

-      srcData = (ubyte *) pipe_transfer_map(pipe, srcTrans);

-      dstData = (ubyte *) pipe_transfer_map(pipe, dstTrans);

-

-      srcStride = srcTrans->stride / util_format_get_blocksize(srcTrans->resource->format);

-      dstStride = dstTrans->stride / util_format_get_blocksize(dstTrans->resource->format);

-

-     /* this cannot work correctly for 3d since it does

-        not respect layerStride. */

-      if (compressed) {

-         const enum pipe_format format = pt->format;

-         const uint bw = util_format_get_blockwidth(format);

-         const uint bh = util_format_get_blockheight(format);

-         const uint srcWidth2 = align(srcWidth, bw);

-         const uint srcHeight2 = align(srcHeight, bh);

-         const uint dstWidth2 = align(dstWidth, bw);

-         const uint dstHeight2 = align(dstHeight, bh);

-         uint8_t *srcTemp, *dstTemp;

-

-         assert(comps == 4);

-

-         srcTemp = malloc(srcWidth2 * srcHeight2 * comps * (datatype == GL_FLOAT ? 4 : 1));

-         dstTemp = malloc(dstWidth2 * dstHeight2 * comps * (datatype == GL_FLOAT ? 4 : 1));

-

-         /* decompress the src image: srcData -> srcTemp */

-         decompress_image(format, datatype, srcData, srcTemp, srcWidth2, srcHeight2, srcTrans->stride);

-

-         _mesa_generate_mipmap_level(target, datatype, comps,

-                                     0 /*border*/,

-                                     srcWidth2, srcHeight2, srcDepth,

-                                     srcTemp,

-                                     srcWidth2, /* stride in texels */

-                                     dstWidth2, dstHeight2, dstDepth,

-                                     dstTemp,

-                                     dstWidth2); /* stride in texels */

-

-         /* compress the new image: dstTemp -> dstData */

-         compress_image(format, datatype, dstTemp, dstData, dstWidth2, dstHeight2, dstTrans->stride);

-

-         free(srcTemp);

-         free(dstTemp);

-      }

-      else {

-         _mesa_generate_mipmap_level(target, datatype, comps,

-                                     0 /*border*/,

-                                     srcWidth, srcHeight, srcDepth,

-                                     srcData,

-                                     srcStride, /* stride in texels */

-                                     dstWidth, dstHeight, dstDepth,

-                                     dstData,

-                                     dstStride); /* stride in texels */

-      }

-

-      pipe_transfer_unmap(pipe, srcTrans);

-      pipe_transfer_unmap(pipe, dstTrans);

-

-      pipe->transfer_destroy(pipe, srcTrans);

-      pipe->transfer_destroy(pipe, dstTrans);

-   }

-}

-

-

-/**

- * Compute the expected number of mipmap levels in the texture given

- * the width/height/depth of the base image and the GL_TEXTURE_BASE_LEVEL/

- * GL_TEXTURE_MAX_LEVEL settings.  This will tell us how many mipmap

- * levels should be generated.

- */

-static GLuint

-compute_num_levels(struct gl_context *ctx,

-                   struct gl_texture_object *texObj,

-                   GLenum target)

-{

-   if (target == GL_TEXTURE_RECTANGLE_ARB) {

-      return 1;

-   }

-   else {

-      const struct gl_texture_image *baseImage = 

-         _mesa_get_tex_image(ctx, texObj, target, texObj->BaseLevel);

-      GLuint size, numLevels;

-

-      size = MAX2(baseImage->Width2, baseImage->Height2);

-      size = MAX2(size, baseImage->Depth2);

-

-      numLevels = texObj->BaseLevel;

-

-      while (size > 0) {

-         numLevels++;

-         size >>= 1;

-      }

-

-      numLevels = MIN2(numLevels, texObj->MaxLevel + 1);

-

-      assert(numLevels >= 1);

-

-      return numLevels;

-   }

-}

-

-

-/**

- * Called via ctx->Driver.GenerateMipmap().

- */

-void

-st_generate_mipmap(struct gl_context *ctx, GLenum target,

-                   struct gl_texture_object *texObj)

-{

-   struct st_context *st = st_context(ctx);

-   struct st_texture_object *stObj = st_texture_object(texObj);

-   struct pipe_resource *pt = st_get_texobj_resource(texObj);

-   const uint baseLevel = texObj->BaseLevel;

-   uint lastLevel;

-   uint dstLevel;

-

-   if (!pt)

-      return;

-

-   /* not sure if this ultimately actually should work,

-      but we're not supporting multisampled textures yet. */

-   assert(pt->nr_samples < 2);

-

-   /* find expected last mipmap level to generate*/

-   lastLevel = compute_num_levels(ctx, texObj, target) - 1;

-

-   if (lastLevel == 0)

-      return;

-

-   /* The texture isn't in a "complete" state yet so set the expected

-    * lastLevel here, since it won't get done in st_finalize_texture().

-    */

-   stObj->lastLevel = lastLevel;

-

-   if (pt->last_level < lastLevel) {

-      /* The current gallium texture doesn't have space for all the

-       * mipmap levels we need to generate.  So allocate a new texture.

-       */

-      struct pipe_resource *oldTex = stObj->pt;

-

-      /* create new texture with space for more levels */

-      stObj->pt = st_texture_create(st,

-                                    oldTex->target,

-                                    oldTex->format,

-                                    lastLevel,

-                                    oldTex->width0,

-                                    oldTex->height0,

-                                    oldTex->depth0,

-                                    oldTex->array_size,

-                                    oldTex->bind);

-

-      /* This will copy the old texture's base image into the new texture

-       * which we just allocated.

-       */

-      st_finalize_texture(ctx, st->pipe, texObj);

-

-      /* release the old tex (will likely be freed too) */

-      pipe_resource_reference(&oldTex, NULL);

-      pipe_sampler_view_reference(&stObj->sampler_view, NULL);

-   }

-   else {

-      /* Make sure that the base texture image data is present in the

-       * texture buffer.

-       */

-      st_finalize_texture(ctx, st->pipe, texObj);

-   }

-

-   pt = stObj->pt;

-

-   assert(pt->last_level >= lastLevel);

-

-   /* Try to generate the mipmap by rendering/texturing.  If that fails,

-    * use the software fallback.

-    */

-   if (!st_render_mipmap(st, target, stObj, baseLevel, lastLevel)) {

-      /* since the util code actually also has a fallback, should

-         probably make it never fail and kill this */

-      fallback_generate_mipmap(ctx, target, texObj);

-   }

-

-   /* Fill in the Mesa gl_texture_image fields */

-   for (dstLevel = baseLevel + 1; dstLevel <= lastLevel; dstLevel++) {

-      const uint srcLevel = dstLevel - 1;

-      const struct gl_texture_image *srcImage

-         = _mesa_get_tex_image(ctx, texObj, target, srcLevel);

-      struct gl_texture_image *dstImage;

-      struct st_texture_image *stImage;

-      uint dstWidth = u_minify(pt->width0, dstLevel);

-      uint dstHeight = u_minify(pt->height0, dstLevel);

-      uint dstDepth = u_minify(pt->depth0, dstLevel); 

-      uint border = srcImage->Border;

-

-      dstImage = _mesa_get_tex_image(ctx, texObj, target, dstLevel);

-      if (!dstImage) {

-         _mesa_error(ctx, GL_OUT_OF_MEMORY, "generating mipmaps");

-         return;

-      }

-

-      /* Free old image data */

-      if (dstImage->Data)

-         ctx->Driver.FreeTexImageData(ctx, dstImage);

-

-      /* initialize new image */

-      _mesa_init_teximage_fields(ctx, target, dstImage, dstWidth, dstHeight,

-                                 dstDepth, border, srcImage->InternalFormat,

-                                 srcImage->TexFormat);

-

-      stImage = st_texture_image(dstImage);

-      stImage->level = dstLevel;

-

-      pipe_resource_reference(&stImage->pt, pt);

-   }

-}

+/**************************************************************************
+ * 
+ * Copyright 2008 Tungsten Graphics, Inc., Cedar Park, Texas.
+ * 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 TUNGSTEN GRAPHICS 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.
+ * 
+ **************************************************************************/
+
+
+#include "main/imports.h"
+#include "main/mipmap.h"
+#include "main/teximage.h"
+
+#include "pipe/p_context.h"
+#include "pipe/p_defines.h"
+#include "util/u_inlines.h"
+#include "util/u_format.h"
+#include "util/u_gen_mipmap.h"
+
+#include "st_debug.h"
+#include "st_context.h"
+#include "st_texture.h"
+#include "st_gen_mipmap.h"
+#include "st_cb_texture.h"
+
+
+/**
+ * one-time init for generate mipmap
+ * XXX Note: there may be other times we need no-op/simple state like this.
+ * In that case, some code refactoring would be good.
+ */
+void
+st_init_generate_mipmap(struct st_context *st)
+{
+   st->gen_mipmap = util_create_gen_mipmap(st->pipe, st->cso_context);
+}
+
+
+void
+st_destroy_generate_mipmap(struct st_context *st)
+{
+   util_destroy_gen_mipmap(st->gen_mipmap);
+   st->gen_mipmap = NULL;
+}
+
+
+/**
+ * Generate mipmap levels using hardware rendering.
+ * \return TRUE if successful, FALSE if not possible
+ */
+static boolean
+st_render_mipmap(struct st_context *st,
+                 GLenum target,
+                 struct st_texture_object *stObj,
+                 uint baseLevel, uint lastLevel)
+{
+   struct pipe_context *pipe = st->pipe;
+   struct pipe_screen *screen = pipe->screen;
+   struct pipe_sampler_view *psv = st_get_texture_sampler_view(stObj, pipe);
+   const uint face = _mesa_tex_target_to_face(target);
+
+   assert(psv->texture == stObj->pt);
+#if 0
+   assert(target != GL_TEXTURE_3D); /* implemented but untested */
+#endif
+
+   /* check if we can render in the texture's format */
+   /* XXX should probably kill this and always use util_gen_mipmap
+      since this implements a sw fallback as well */
+   if (!screen->is_format_supported(screen, psv->format, psv->texture->target,
+                                    0, PIPE_BIND_RENDER_TARGET)) {
+      return FALSE;
+   }
+
+   util_gen_mipmap(st->gen_mipmap, psv, face, baseLevel, lastLevel,
+                   PIPE_TEX_FILTER_LINEAR);
+
+   return TRUE;
+}
+
+
+/**
+ * Helper function to decompress an image.  The result is a 32-bpp RGBA
+ * image with stride==width.
+ */
+static void
+decompress_image(enum pipe_format format, int datatype,
+                 const uint8_t *src, void *dst,
+                 unsigned width, unsigned height, unsigned src_stride)
+{
+   const struct util_format_description *desc = util_format_description(format);
+   const uint bw = util_format_get_blockwidth(format);
+   const uint bh = util_format_get_blockheight(format);
+   uint dst_stride = 4 * MAX2(width, bw);
+
+   if (datatype == GL_FLOAT) {
+      desc->unpack_rgba_float((float *)dst, dst_stride * sizeof(GLfloat), src, src_stride, width, height);
+      if (width < bw || height < bh) {
+	 float *dst_p = (float *)dst;
+	 /* We're decompressing an image smaller than the compression
+	  * block size.  We don't want garbage pixel values in the region
+	  * outside (width x height) so replicate pixels from the (width
+	  * x height) region to fill out the (bw x bh) block size.
+	  */
+	 uint x, y;
+	 for (y = 0; y < bh; y++) {
+	    for (x = 0; x < bw; x++) {
+	       if (x >= width || y >= height) {
+		  uint p = (y * bw + x) * 4;
+		  dst_p[p + 0] = dst_p[0];
+		  dst_p[p + 1] = dst_p[1];
+		  dst_p[p + 2] = dst_p[2];
+		  dst_p[p + 3] = dst_p[3];
+	       }
+	    }
+	 }
+      }
+   } else {
+      desc->unpack_rgba_8unorm((uint8_t *)dst, dst_stride, src, src_stride, width, height);
+      if (width < bw || height < bh) {
+	 uint8_t *dst_p = (uint8_t *)dst;
+	 /* We're decompressing an image smaller than the compression
+	  * block size.  We don't want garbage pixel values in the region
+	  * outside (width x height) so replicate pixels from the (width
+	  * x height) region to fill out the (bw x bh) block size.
+	  */
+	 uint x, y;
+	 for (y = 0; y < bh; y++) {
+	    for (x = 0; x < bw; x++) {
+	       if (x >= width || y >= height) {
+		  uint p = (y * bw + x) * 4;
+		  dst_p[p + 0] = dst_p[0];
+		  dst_p[p + 1] = dst_p[1];
+		  dst_p[p + 2] = dst_p[2];
+		  dst_p[p + 3] = dst_p[3];
+	       }
+	    }
+	 }
+      }
+   }
+}
+
+/**
+ * Helper function to compress an image.  The source is a 32-bpp RGBA image
+ * with stride==width.
+ */
+static void
+compress_image(enum pipe_format format, int datatype,
+               const void *src, uint8_t *dst,
+               unsigned width, unsigned height, unsigned dst_stride)
+{
+   const struct util_format_description *desc = util_format_description(format);
+   const uint src_stride = 4 * width;
+
+   if (datatype == GL_FLOAT)
+      desc->pack_rgba_float(dst, dst_stride, (GLfloat *)src, src_stride * sizeof(GLfloat), width, height);
+   else
+      desc->pack_rgba_8unorm(dst, dst_stride, (uint8_t *)src, src_stride, width, height);
+}
+
+
+/**
+ * Software fallback for generate mipmap levels.
+ */
+static void
+fallback_generate_mipmap(struct gl_context *ctx, GLenum target,
+                         struct gl_texture_object *texObj)
+{
+   struct pipe_context *pipe = st_context(ctx)->pipe;
+   struct pipe_resource *pt = st_get_texobj_resource(texObj);
+   const uint baseLevel = texObj->BaseLevel;
+   const uint lastLevel = pt->last_level;
+   const uint face = _mesa_tex_target_to_face(target);
+   uint dstLevel;
+   GLenum datatype;
+   GLuint comps;
+   GLboolean compressed;
+
+   if (ST_DEBUG & DEBUG_FALLBACK)
+      debug_printf("%s: fallback processing\n", __FUNCTION__);
+
+   assert(target != GL_TEXTURE_3D); /* not done yet */
+
+   compressed =
+      _mesa_is_format_compressed(texObj->Image[face][baseLevel]->TexFormat);
+
+   if (compressed) {
+      GLenum type =
+         _mesa_get_format_datatype(texObj->Image[face][baseLevel]->TexFormat);
+
+      datatype = type == GL_UNSIGNED_NORMALIZED ? GL_UNSIGNED_BYTE : GL_FLOAT;
+      comps = 4;
+   }
+   else {
+      _mesa_format_to_type_and_comps(texObj->Image[face][baseLevel]->TexFormat,
+                                     &datatype, &comps);
+      assert(comps > 0 && "bad texture format in fallback_generate_mipmap()");
+   }
+
+   for (dstLevel = baseLevel + 1; dstLevel <= lastLevel; dstLevel++) {
+      const uint srcLevel = dstLevel - 1;
+      const uint srcWidth = u_minify(pt->width0, srcLevel);
+      const uint srcHeight = u_minify(pt->height0, srcLevel);
+      const uint srcDepth = u_minify(pt->depth0, srcLevel);
+      const uint dstWidth = u_minify(pt->width0, dstLevel);
+      const uint dstHeight = u_minify(pt->height0, dstLevel);
+      const uint dstDepth = u_minify(pt->depth0, dstLevel);
+      struct pipe_transfer *srcTrans, *dstTrans;
+      const ubyte *srcData;
+      ubyte *dstData;
+      int srcStride, dstStride;
+
+      srcTrans = pipe_get_transfer(pipe, pt, srcLevel,
+                                   face,
+                                   PIPE_TRANSFER_READ, 0, 0,
+                                   srcWidth, srcHeight);
+
+      dstTrans = pipe_get_transfer(pipe, pt, dstLevel,
+                                   face,
+                                   PIPE_TRANSFER_WRITE, 0, 0,
+                                   dstWidth, dstHeight);
+
+      srcData = (ubyte *) pipe_transfer_map(pipe, srcTrans);
+      dstData = (ubyte *) pipe_transfer_map(pipe, dstTrans);
+
+      srcStride = srcTrans->stride / util_format_get_blocksize(srcTrans->resource->format);
+      dstStride = dstTrans->stride / util_format_get_blocksize(dstTrans->resource->format);
+
+     /* this cannot work correctly for 3d since it does
+        not respect layerStride. */
+      if (compressed) {
+         const enum pipe_format format = pt->format;
+         const uint bw = util_format_get_blockwidth(format);
+         const uint bh = util_format_get_blockheight(format);
+         const uint srcWidth2 = align(srcWidth, bw);
+         const uint srcHeight2 = align(srcHeight, bh);
+         const uint dstWidth2 = align(dstWidth, bw);
+         const uint dstHeight2 = align(dstHeight, bh);
+         uint8_t *srcTemp, *dstTemp;
+
+         assert(comps == 4);
+
+         srcTemp = malloc(srcWidth2 * srcHeight2 * comps * (datatype == GL_FLOAT ? 4 : 1));
+         dstTemp = malloc(dstWidth2 * dstHeight2 * comps * (datatype == GL_FLOAT ? 4 : 1));
+
+         /* decompress the src image: srcData -> srcTemp */
+         decompress_image(format, datatype, srcData, srcTemp, srcWidth2, srcHeight2, srcTrans->stride);
+
+         _mesa_generate_mipmap_level(target, datatype, comps,
+                                     0 /*border*/,
+                                     srcWidth2, srcHeight2, srcDepth,
+                                     srcTemp,
+                                     srcWidth2, /* stride in texels */
+                                     dstWidth2, dstHeight2, dstDepth,
+                                     dstTemp,
+                                     dstWidth2); /* stride in texels */
+
+         /* compress the new image: dstTemp -> dstData */
+         compress_image(format, datatype, dstTemp, dstData, dstWidth2, dstHeight2, dstTrans->stride);
+
+         free(srcTemp);
+         free(dstTemp);
+      }
+      else {
+         _mesa_generate_mipmap_level(target, datatype, comps,
+                                     0 /*border*/,
+                                     srcWidth, srcHeight, srcDepth,
+                                     srcData,
+                                     srcStride, /* stride in texels */
+                                     dstWidth, dstHeight, dstDepth,
+                                     dstData,
+                                     dstStride); /* stride in texels */
+      }
+
+      pipe_transfer_unmap(pipe, srcTrans);
+      pipe_transfer_unmap(pipe, dstTrans);
+
+      pipe->transfer_destroy(pipe, srcTrans);
+      pipe->transfer_destroy(pipe, dstTrans);
+   }
+}
+
+
+/**
+ * Compute the expected number of mipmap levels in the texture given
+ * the width/height/depth of the base image and the GL_TEXTURE_BASE_LEVEL/
+ * GL_TEXTURE_MAX_LEVEL settings.  This will tell us how many mipmap
+ * levels should be generated.
+ */
+static GLuint
+compute_num_levels(struct gl_context *ctx,
+                   struct gl_texture_object *texObj,
+                   GLenum target)
+{
+   if (target == GL_TEXTURE_RECTANGLE_ARB) {
+      return 1;
+   }
+   else {
+      const struct gl_texture_image *baseImage = 
+         _mesa_get_tex_image(ctx, texObj, target, texObj->BaseLevel);
+      GLuint size, numLevels;
+
+      size = MAX2(baseImage->Width2, baseImage->Height2);
+      size = MAX2(size, baseImage->Depth2);
+
+      numLevels = texObj->BaseLevel;
+
+      while (size > 0) {
+         numLevels++;
+         size >>= 1;
+      }
+
+      numLevels = MIN2(numLevels, texObj->MaxLevel + 1);
+
+      assert(numLevels >= 1);
+
+      return numLevels;
+   }
+}
+
+
+/**
+ * Called via ctx->Driver.GenerateMipmap().
+ */
+void
+st_generate_mipmap(struct gl_context *ctx, GLenum target,
+                   struct gl_texture_object *texObj)
+{
+   struct st_context *st = st_context(ctx);
+   struct st_texture_object *stObj = st_texture_object(texObj);
+   struct pipe_resource *pt = st_get_texobj_resource(texObj);
+   const uint baseLevel = texObj->BaseLevel;
+   uint lastLevel;
+   uint dstLevel;
+
+   if (!pt)
+      return;
+
+   /* not sure if this ultimately actually should work,
+      but we're not supporting multisampled textures yet. */
+   assert(pt->nr_samples < 2);
+
+   /* find expected last mipmap level to generate*/
+   lastLevel = compute_num_levels(ctx, texObj, target) - 1;
+
+   if (lastLevel == 0)
+      return;
+
+   /* The texture isn't in a "complete" state yet so set the expected
+    * lastLevel here, since it won't get done in st_finalize_texture().
+    */
+   stObj->lastLevel = lastLevel;
+
+   if (pt->last_level < lastLevel) {
+      /* The current gallium texture doesn't have space for all the
+       * mipmap levels we need to generate.  So allocate a new texture.
+       */
+      struct pipe_resource *oldTex = stObj->pt;
+
+      /* create new texture with space for more levels */
+      stObj->pt = st_texture_create(st,
+                                    oldTex->target,
+                                    oldTex->format,
+                                    lastLevel,
+                                    oldTex->width0,
+                                    oldTex->height0,
+                                    oldTex->depth0,
+                                    oldTex->array_size,
+                                    oldTex->bind);
+
+      /* This will copy the old texture's base image into the new texture
+       * which we just allocated.
+       */
+      st_finalize_texture(ctx, st->pipe, texObj);
+
+      /* release the old tex (will likely be freed too) */
+      pipe_resource_reference(&oldTex, NULL);
+      pipe_sampler_view_reference(&stObj->sampler_view, NULL);
+   }
+   else {
+      /* Make sure that the base texture image data is present in the
+       * texture buffer.
+       */
+      st_finalize_texture(ctx, st->pipe, texObj);
+   }
+
+   pt = stObj->pt;
+
+   assert(pt->last_level >= lastLevel);
+
+   /* Try to generate the mipmap by rendering/texturing.  If that fails,
+    * use the software fallback.
+    */
+   if (!st_render_mipmap(st, target, stObj, baseLevel, lastLevel)) {
+      /* since the util code actually also has a fallback, should
+         probably make it never fail and kill this */
+      fallback_generate_mipmap(ctx, target, texObj);
+   }
+
+   /* Fill in the Mesa gl_texture_image fields */
+   for (dstLevel = baseLevel + 1; dstLevel <= lastLevel; dstLevel++) {
+      const uint srcLevel = dstLevel - 1;
+      const struct gl_texture_image *srcImage
+         = _mesa_get_tex_image(ctx, texObj, target, srcLevel);
+      struct gl_texture_image *dstImage;
+      struct st_texture_image *stImage;
+      uint dstWidth = u_minify(pt->width0, dstLevel);
+      uint dstHeight = u_minify(pt->height0, dstLevel);
+      uint dstDepth = u_minify(pt->depth0, dstLevel); 
+      uint border = srcImage->Border;
+
+      dstImage = _mesa_get_tex_image(ctx, texObj, target, dstLevel);
+      if (!dstImage) {
+         _mesa_error(ctx, GL_OUT_OF_MEMORY, "generating mipmaps");
+         return;
+      }
+
+      /* Free old image data */
+      if (dstImage->Data)
+         ctx->Driver.FreeTexImageData(ctx, dstImage);
+
+      /* initialize new image */
+      _mesa_init_teximage_fields(ctx, target, dstImage, dstWidth, dstHeight,
+                                 dstDepth, border, srcImage->InternalFormat,
+                                 srcImage->TexFormat);
+
+      stImage = st_texture_image(dstImage);
+      stImage->level = dstLevel;
+
+      pipe_resource_reference(&stImage->pt, pt);
+   }
+}