src/parsec/disk-image/parsec/parsec-benchmark/pkgs/libs/mesa/src/src/mesa/drivers/dri/intel/intel_mipmap_tree.c - public/gem5-resources - Git at Google

 /**************************************************************************
  *
  * Copyright 2006 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 "intel_context.h"
 #include "intel_mipmap_tree.h"
 #include "intel_regions.h"
 #include "intel_chipset.h"
 #include "enums.h"

 #define FILE_DEBUG_FLAG DEBUG_MIPTREE

 static GLenum
 target_to_target(GLenum target)
 {
    switch (target) {
    case GL_TEXTURE_CUBE_MAP_POSITIVE_X_ARB:
    case GL_TEXTURE_CUBE_MAP_NEGATIVE_X_ARB:
    case GL_TEXTURE_CUBE_MAP_POSITIVE_Y_ARB:
    case GL_TEXTURE_CUBE_MAP_NEGATIVE_Y_ARB:
    case GL_TEXTURE_CUBE_MAP_POSITIVE_Z_ARB:
    case GL_TEXTURE_CUBE_MAP_NEGATIVE_Z_ARB:
       return GL_TEXTURE_CUBE_MAP_ARB;
    default:
       return target;
    }
 }

 static struct intel_mipmap_tree *
 intel_miptree_create_internal(struct intel_context *intel,
 			      GLenum target,
 			      GLenum internal_format,
 			      GLuint first_level,
 			      GLuint last_level,
 			      GLuint width0,
 			      GLuint height0,
 			      GLuint depth0, GLuint cpp, GLuint compress_byte)
 {
    GLboolean ok;
    struct intel_mipmap_tree *mt = calloc(sizeof(*mt), 1);

    DBG("%s target %s format %s level %d..%d\n", __FUNCTION__,
        _mesa_lookup_enum_by_nr(target),
        _mesa_lookup_enum_by_nr(internal_format), first_level, last_level);

    mt->target = target_to_target(target);
    mt->internal_format = internal_format;
    mt->first_level = first_level;
    mt->last_level = last_level;
    mt->width0 = width0;
    mt->height0 = height0;
    mt->depth0 = depth0;
    mt->cpp = compress_byte ? compress_byte : cpp;
    mt->compressed = compress_byte ? 1 : 0;
    mt->refcount = 1;
    mt->pitch = 0;

 #ifdef I915
    if (IS_945(intel->intelScreen->deviceID))
       ok = i945_miptree_layout(intel, mt);
    else
       ok = i915_miptree_layout(intel, mt);
 #else
    ok = brw_miptree_layout(intel, mt);
 #endif

    if (!ok) {
       free(mt);
       return NULL;
    }

    return mt;
 }

 struct intel_mipmap_tree *
 intel_miptree_create(struct intel_context *intel,
 		     GLenum target,
 		     GLenum internal_format,
 		     GLuint first_level,
 		     GLuint last_level,
 		     GLuint width0,
 		     GLuint height0,
 		     GLuint depth0, GLuint cpp, GLuint compress_byte)
 {
    struct intel_mipmap_tree *mt;

    mt = intel_miptree_create_internal(intel, target, internal_format,
 				      first_level, last_level, width0,
 				      height0, depth0, cpp, compress_byte);
    /*
     * pitch == 0 indicates the null texture
     */
    if (!mt || !mt->pitch)
       return NULL;

    mt->region = intel_region_alloc(intel,
 				   mt->cpp, mt->pitch, mt->total_height);

    if (!mt->region) {
        free(mt);
        return NULL;
    }

    return mt;
 }

 struct intel_mipmap_tree *
 intel_miptree_create_for_region(struct intel_context *intel,
 				GLenum target,
 				GLenum internal_format,
 				GLuint first_level,
 				GLuint last_level,
 				struct intel_region *region,
 				GLuint depth0,
 				GLuint compress_byte)
 {
    struct intel_mipmap_tree *mt;

    mt = intel_miptree_create_internal(intel, target, internal_format,
 				      first_level, last_level,
 				      region->pitch, region->height, depth0,
 				      region->cpp, compress_byte);
    if (!mt)
       return mt;
 #if 0
    if (mt->pitch != region->pitch) {
       fprintf(stderr,
 	      "region pitch (%d) doesn't match mipmap tree pitch (%d)\n",
 	      region->pitch, mt->pitch);
       free(mt);
       return NULL;
    }
 #else
    /* The mipmap tree pitch is aligned to 64 bytes to make sure render
     * to texture works, but we don't need that for texturing from a
     * pixmap.  Just override it here. */
    mt->pitch = region->pitch;
 #endif

    mt->region = region;

    return mt;
  }

 /**
  * intel_miptree_pitch_align:
  *
  * @intel: intel context pointer
  *
  * @mt: the miptree to compute pitch alignment for
  *
  * @pitch: the natural pitch value
  *
  * Given @pitch, compute a larger value which accounts for
  * any necessary alignment required by the device
  */

 int intel_miptree_pitch_align (struct intel_context *intel,
 			       struct intel_mipmap_tree *mt,
 			       int pitch)
 {
 #ifdef I915
    GLcontext *ctx = &intel->ctx;
 #endif

    if (!mt->compressed) {
       int pitch_align;

       if (intel->ttm) {
 	 /* XXX: Align pitch to multiple of 64 bytes for now to allow
 	  * render-to-texture to work in all cases. This should probably be
 	  * replaced at some point by some scheme to only do this when really
 	  * necessary.
 	  */
 	 pitch_align = 64;
       } else {
 	 pitch_align = 4;
       }

       pitch = ALIGN(pitch * mt->cpp, pitch_align);

 #ifdef I915
       /* XXX: At least the i915 seems very upset when the pitch is a multiple
        * of 1024 and sometimes 512 bytes - performance can drop by several
        * times. Go to the next multiple of the required alignment for now.
        */
       if (!(pitch & 511) &&
 	 (pitch + pitch_align) < (1 << ctx->Const.MaxTextureLevels))
 	 pitch += pitch_align;
 #endif

       pitch /= mt->cpp;
    }
    return pitch;
 }

 void
 intel_miptree_reference(struct intel_mipmap_tree **dst,
                         struct intel_mipmap_tree *src)
 {
    src->refcount++;
    *dst = src;
    DBG("%s %p refcount now %d\n", __FUNCTION__, src, src->refcount);
 }

 void
 intel_miptree_release(struct intel_context *intel,
                       struct intel_mipmap_tree **mt)
 {
    if (!*mt)
       return;

    DBG("%s %p refcount will be %d\n", __FUNCTION__, *mt, (*mt)->refcount - 1);
    if (--(*mt)->refcount <= 0) {
       GLuint i;

       DBG("%s deleting %p\n", __FUNCTION__, *mt);

       intel_region_release(&((*mt)->region));

       for (i = 0; i < MAX_TEXTURE_LEVELS; i++)
          if ((*mt)->level[i].image_offset)
             free((*mt)->level[i].image_offset);

       free(*mt);
    }
    *mt = NULL;
 }


 /* Can the image be pulled into a unified mipmap tree.  This mirrors
  * the completeness test in a lot of ways.
  *
  * Not sure whether I want to pass gl_texture_image here.
  */
 GLboolean
 intel_miptree_match_image(struct intel_mipmap_tree *mt,
                           struct gl_texture_image *image,
                           GLuint face, GLuint level)
 {
    /* Images with borders are never pulled into mipmap trees.
     */
    if (image->Border ||
        ((image->_BaseFormat == GL_DEPTH_COMPONENT) &&
         ((image->TexObject->WrapS == GL_CLAMP_TO_BORDER) ||
          (image->TexObject->WrapT == GL_CLAMP_TO_BORDER))))
       return GL_FALSE;

    if (image->InternalFormat != mt->internal_format ||
        image->IsCompressed != mt->compressed)
       return GL_FALSE;

    if (!image->IsCompressed &&
        !mt->compressed &&
        image->TexFormat->TexelBytes != mt->cpp)
       return GL_FALSE;

    /* Test image dimensions against the base level image adjusted for
     * minification.  This will also catch images not present in the
     * tree, changed targets, etc.
     */
    if (image->Width != mt->level[level].width ||
        image->Height != mt->level[level].height ||
        image->Depth != mt->level[level].depth)
       return GL_FALSE;

    return GL_TRUE;
 }


 void
 intel_miptree_set_level_info(struct intel_mipmap_tree *mt,
 			     GLuint level,
 			     GLuint nr_images,
 			     GLuint x, GLuint y,
 			     GLuint w, GLuint h, GLuint d)
 {
    mt->level[level].width = w;
    mt->level[level].height = h;
    mt->level[level].depth = d;
    mt->level[level].level_offset = (x + y * mt->pitch) * mt->cpp;
    mt->level[level].nr_images = nr_images;

    DBG("%s level %d size: %d,%d,%d offset %d,%d (0x%x)\n", __FUNCTION__,
        level, w, h, d, x, y, mt->level[level].level_offset);

    /* Not sure when this would happen, but anyway:
     */
    if (mt->level[level].image_offset) {
       free(mt->level[level].image_offset);
       mt->level[level].image_offset = NULL;
    }

    assert(nr_images);

    mt->level[level].image_offset = malloc(nr_images * sizeof(GLuint));
    mt->level[level].image_offset[0] = 0;
 }


 void
 intel_miptree_set_image_offset(struct intel_mipmap_tree *mt,
 			       GLuint level, GLuint img,
 			       GLuint x, GLuint y)
 {
    if (img == 0 && level == 0)
       assert(x == 0 && y == 0);

    assert(img < mt->level[level].nr_images);

    mt->level[level].image_offset[img] = (x + y * mt->pitch) * mt->cpp;

    DBG("%s level %d img %d pos %d,%d image_offset %x\n",
        __FUNCTION__, level, img, x, y, mt->level[level].image_offset[img]);
 }


 /* Although we use the image_offset[] array to store relative offsets
  * to cube faces, Mesa doesn't know anything about this and expects
  * each cube face to be treated as a separate image.
  *
  * These functions present that view to mesa:
  */
 const GLuint *
 intel_miptree_depth_offsets(struct intel_mipmap_tree *mt, GLuint level)
 {
    static const GLuint zero = 0;

    if (mt->target != GL_TEXTURE_3D || mt->level[level].nr_images == 1)
       return &zero;
    else
       return mt->level[level].image_offset;
 }


 GLuint
 intel_miptree_image_offset(struct intel_mipmap_tree *mt,
 			   GLuint face, GLuint level)
 {
    if (mt->target == GL_TEXTURE_CUBE_MAP_ARB)
       return (mt->level[level].level_offset +
 	      mt->level[level].image_offset[face]);
    else
       return mt->level[level].level_offset;
 }


 /**
  * Map a teximage in a mipmap tree.
  * \param row_stride  returns row stride in bytes
  * \param image_stride  returns image stride in bytes (for 3D textures).
  * \param image_offsets pointer to array of pixel offsets from the returned
  *	  pointer to each depth image
  * \return address of mapping
  */
 GLubyte *
 intel_miptree_image_map(struct intel_context * intel,
                         struct intel_mipmap_tree * mt,
                         GLuint face,
                         GLuint level,
                         GLuint * row_stride, GLuint * image_offsets)
 {
    DBG("%s \n", __FUNCTION__);

    if (row_stride)
       *row_stride = mt->pitch * mt->cpp;

    if (mt->target == GL_TEXTURE_3D) {
       int i;

       for (i = 0; i < mt->level[level].depth; i++)
 	 image_offsets[i] = mt->level[level].image_offset[i] / mt->cpp;
    } else {
       assert(mt->level[level].depth == 1);
       assert(mt->target == GL_TEXTURE_CUBE_MAP ||
 	     mt->level[level].image_offset[0] == 0);
       image_offsets[0] = 0;
    }

    return (intel_region_map(intel, mt->region) +
            intel_miptree_image_offset(mt, face, level));
 }

 void
 intel_miptree_image_unmap(struct intel_context *intel,
                           struct intel_mipmap_tree *mt)
 {
    DBG("%s\n", __FUNCTION__);
    intel_region_unmap(intel, mt->region);
 }


 /* Upload data for a particular image.
  */
 void
 intel_miptree_image_data(struct intel_context *intel,
 			 struct intel_mipmap_tree *dst,
 			 GLuint face,
 			 GLuint level,
 			 void *src,
 			 GLuint src_row_pitch,
 			 GLuint src_image_pitch)
 {
    GLuint depth = dst->level[level].depth;
    GLuint dst_offset = intel_miptree_image_offset(dst, face, level);
    const GLuint *dst_depth_offset = intel_miptree_depth_offsets(dst, level);
    GLuint i;
    GLuint height = 0;

    DBG("%s: %d/%d\n", __FUNCTION__, face, level);
    for (i = 0; i < depth; i++) {
       height = dst->level[level].height;
       if(dst->compressed)
 	 height = (height + 3) / 4;
       intel_region_data(intel,
 			dst->region,
 			dst_offset + dst_depth_offset[i], /* dst_offset */
 			0, 0,                             /* dstx, dsty */
 			src,
 			src_row_pitch,
 			0, 0,                             /* source x, y */
 			dst->level[level].width, height); /* width, height */

       src += src_image_pitch * dst->cpp;
    }
 }

 extern GLuint intel_compressed_alignment(GLenum);
 /* Copy mipmap image between trees
  */
 void
 intel_miptree_image_copy(struct intel_context *intel,
                          struct intel_mipmap_tree *dst,
                          GLuint face, GLuint level,
                          struct intel_mipmap_tree *src)
 {
    GLuint width = src->level[level].width;
    GLuint height = src->level[level].height;
    GLuint depth = src->level[level].depth;
    GLuint dst_offset = intel_miptree_image_offset(dst, face, level);
    GLuint src_offset = intel_miptree_image_offset(src, face, level);
    const GLuint *dst_depth_offset = intel_miptree_depth_offsets(dst, level);
    const GLuint *src_depth_offset = intel_miptree_depth_offsets(src, level);
    GLuint i;

    if (dst->compressed) {
        GLuint alignment = intel_compressed_alignment(dst->internal_format);
        height = (height + 3) / 4;
        width = ((width + alignment - 1) & ~(alignment - 1));
    }

    for (i = 0; i < depth; i++) {
       intel_region_copy(intel,
                         dst->region, dst_offset + dst_depth_offset[i],
                         0,
                         0,
                         src->region, src_offset + src_depth_offset[i],
                         0, 0, width, height);
    }

 }
	/**************************************************************************
	*
	* Copyright 2006 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 "intel_context.h"
	#include "intel_mipmap_tree.h"
	#include "intel_regions.h"
	#include "intel_chipset.h"
	#include "enums.h"

	#define FILE_DEBUG_FLAG DEBUG_MIPTREE

	static GLenum
	target_to_target(GLenum target)
	{
	switch (target) {
	case GL_TEXTURE_CUBE_MAP_POSITIVE_X_ARB:
	case GL_TEXTURE_CUBE_MAP_NEGATIVE_X_ARB:
	case GL_TEXTURE_CUBE_MAP_POSITIVE_Y_ARB:
	case GL_TEXTURE_CUBE_MAP_NEGATIVE_Y_ARB:
	case GL_TEXTURE_CUBE_MAP_POSITIVE_Z_ARB:
	case GL_TEXTURE_CUBE_MAP_NEGATIVE_Z_ARB:
	return GL_TEXTURE_CUBE_MAP_ARB;
	default:
	return target;
	}
	}

	static struct intel_mipmap_tree *
	intel_miptree_create_internal(struct intel_context *intel,
	GLenum target,
	GLenum internal_format,
	GLuint first_level,
	GLuint last_level,
	GLuint width0,
	GLuint height0,
	GLuint depth0, GLuint cpp, GLuint compress_byte)
	{
	GLboolean ok;
	struct intel_mipmap_tree mt = calloc(sizeof(mt), 1);

	DBG("%s target %s format %s level %d..%d\n", __FUNCTION__,
	_mesa_lookup_enum_by_nr(target),
	_mesa_lookup_enum_by_nr(internal_format), first_level, last_level);

	mt->target = target_to_target(target);
	mt->internal_format = internal_format;
	mt->first_level = first_level;
	mt->last_level = last_level;
	mt->width0 = width0;
	mt->height0 = height0;
	mt->depth0 = depth0;
	mt->cpp = compress_byte ? compress_byte : cpp;
	mt->compressed = compress_byte ? 1 : 0;
	mt->refcount = 1;
	mt->pitch = 0;

	#ifdef I915
	if (IS_945(intel->intelScreen->deviceID))
	ok = i945_miptree_layout(intel, mt);
	else
	ok = i915_miptree_layout(intel, mt);
	#else
	ok = brw_miptree_layout(intel, mt);
	#endif

	if (!ok) {
	free(mt);
	return NULL;
	}

	return mt;
	}

	struct intel_mipmap_tree *
	intel_miptree_create(struct intel_context *intel,
	GLenum target,
	GLenum internal_format,
	GLuint first_level,
	GLuint last_level,
	GLuint width0,
	GLuint height0,
	GLuint depth0, GLuint cpp, GLuint compress_byte)
	{
	struct intel_mipmap_tree *mt;

	mt = intel_miptree_create_internal(intel, target, internal_format,
	first_level, last_level, width0,
	height0, depth0, cpp, compress_byte);
	/*
	* pitch == 0 indicates the null texture
	*/
	if (!mt \|\| !mt->pitch)
	return NULL;

	mt->region = intel_region_alloc(intel,
	mt->cpp, mt->pitch, mt->total_height);

	if (!mt->region) {
	free(mt);
	return NULL;
	}

	return mt;
	}

	struct intel_mipmap_tree *
	intel_miptree_create_for_region(struct intel_context *intel,
	GLenum target,
	GLenum internal_format,
	GLuint first_level,
	GLuint last_level,
	struct intel_region *region,
	GLuint depth0,
	GLuint compress_byte)
	{
	struct intel_mipmap_tree *mt;

	mt = intel_miptree_create_internal(intel, target, internal_format,
	first_level, last_level,
	region->pitch, region->height, depth0,
	region->cpp, compress_byte);
	if (!mt)
	return mt;
	#if 0
	if (mt->pitch != region->pitch) {
	fprintf(stderr,
	"region pitch (%d) doesn't match mipmap tree pitch (%d)\n",
	region->pitch, mt->pitch);
	free(mt);
	return NULL;
	}
	#else
	/* The mipmap tree pitch is aligned to 64 bytes to make sure render
	* to texture works, but we don't need that for texturing from a
	* pixmap. Just override it here. */
	mt->pitch = region->pitch;
	#endif

	mt->region = region;

	return mt;
	}

	/**
	* intel_miptree_pitch_align:
	*
	* @intel: intel context pointer
	*
	* @mt: the miptree to compute pitch alignment for
	*
	* @pitch: the natural pitch value
	*
	* Given @pitch, compute a larger value which accounts for
	* any necessary alignment required by the device
	*/

	int intel_miptree_pitch_align (struct intel_context *intel,
	struct intel_mipmap_tree *mt,
	int pitch)
	{
	#ifdef I915
	GLcontext *ctx = &intel->ctx;
	#endif

	if (!mt->compressed) {
	int pitch_align;

	if (intel->ttm) {
	/* XXX: Align pitch to multiple of 64 bytes for now to allow
	* render-to-texture to work in all cases. This should probably be
	* replaced at some point by some scheme to only do this when really
	* necessary.
	*/
	pitch_align = 64;
	} else {
	pitch_align = 4;
	}

	pitch = ALIGN(pitch * mt->cpp, pitch_align);

	#ifdef I915
	/* XXX: At least the i915 seems very upset when the pitch is a multiple
	* of 1024 and sometimes 512 bytes - performance can drop by several
	* times. Go to the next multiple of the required alignment for now.
	*/
	if (!(pitch & 511) &&
	(pitch + pitch_align) < (1 << ctx->Const.MaxTextureLevels))
	pitch += pitch_align;
	#endif

	pitch /= mt->cpp;
	}
	return pitch;
	}

	void
	intel_miptree_reference(struct intel_mipmap_tree **dst,
	struct intel_mipmap_tree *src)
	{
	src->refcount++;
	*dst = src;
	DBG("%s %p refcount now %d\n", __FUNCTION__, src, src->refcount);
	}

	void
	intel_miptree_release(struct intel_context *intel,
	struct intel_mipmap_tree **mt)
	{
	if (!*mt)
	return;

	DBG("%s %p refcount will be %d\n", __FUNCTION__, mt, (mt)->refcount - 1);
	if (--(*mt)->refcount <= 0) {
	GLuint i;

	DBG("%s deleting %p\n", __FUNCTION__, *mt);

	intel_region_release(&((*mt)->region));

	for (i = 0; i < MAX_TEXTURE_LEVELS; i++)
	if ((*mt)->level[i].image_offset)
	free((*mt)->level[i].image_offset);

	free(*mt);
	}
	*mt = NULL;
	}




	/* Can the image be pulled into a unified mipmap tree. This mirrors
	* the completeness test in a lot of ways.
	*
	* Not sure whether I want to pass gl_texture_image here.
	*/
	GLboolean
	intel_miptree_match_image(struct intel_mipmap_tree *mt,
	struct gl_texture_image *image,
	GLuint face, GLuint level)
	{
	/* Images with borders are never pulled into mipmap trees.
	*/
	if (image->Border \|\|
	((image->_BaseFormat == GL_DEPTH_COMPONENT) &&
	((image->TexObject->WrapS == GL_CLAMP_TO_BORDER) \|\|
	(image->TexObject->WrapT == GL_CLAMP_TO_BORDER))))
	return GL_FALSE;

	if (image->InternalFormat != mt->internal_format \|\|
	image->IsCompressed != mt->compressed)
	return GL_FALSE;

	if (!image->IsCompressed &&
	!mt->compressed &&
	image->TexFormat->TexelBytes != mt->cpp)
	return GL_FALSE;

	/* Test image dimensions against the base level image adjusted for
	* minification. This will also catch images not present in the
	* tree, changed targets, etc.
	*/
	if (image->Width != mt->level[level].width \|\|
	image->Height != mt->level[level].height \|\|
	image->Depth != mt->level[level].depth)
	return GL_FALSE;

	return GL_TRUE;
	}


	void
	intel_miptree_set_level_info(struct intel_mipmap_tree *mt,
	GLuint level,
	GLuint nr_images,
	GLuint x, GLuint y,
	GLuint w, GLuint h, GLuint d)
	{
	mt->level[level].width = w;
	mt->level[level].height = h;
	mt->level[level].depth = d;
	mt->level[level].level_offset = (x + y * mt->pitch) * mt->cpp;
	mt->level[level].nr_images = nr_images;

	DBG("%s level %d size: %d,%d,%d offset %d,%d (0x%x)\n", __FUNCTION__,
	level, w, h, d, x, y, mt->level[level].level_offset);

	/* Not sure when this would happen, but anyway:
	*/
	if (mt->level[level].image_offset) {
	free(mt->level[level].image_offset);
	mt->level[level].image_offset = NULL;
	}

	assert(nr_images);

	mt->level[level].image_offset = malloc(nr_images * sizeof(GLuint));
	mt->level[level].image_offset[0] = 0;
	}



	void
	intel_miptree_set_image_offset(struct intel_mipmap_tree *mt,
	GLuint level, GLuint img,
	GLuint x, GLuint y)
	{
	if (img == 0 && level == 0)
	assert(x == 0 && y == 0);

	assert(img < mt->level[level].nr_images);

	mt->level[level].image_offset[img] = (x + y * mt->pitch) * mt->cpp;

	DBG("%s level %d img %d pos %d,%d image_offset %x\n",
	__FUNCTION__, level, img, x, y, mt->level[level].image_offset[img]);
	}


	/* Although we use the image_offset[] array to store relative offsets
	* to cube faces, Mesa doesn't know anything about this and expects
	* each cube face to be treated as a separate image.
	*
	* These functions present that view to mesa:
	*/
	const GLuint *
	intel_miptree_depth_offsets(struct intel_mipmap_tree *mt, GLuint level)
	{
	static const GLuint zero = 0;

	if (mt->target != GL_TEXTURE_3D \|\| mt->level[level].nr_images == 1)
	return &zero;
	else
	return mt->level[level].image_offset;
	}


	GLuint
	intel_miptree_image_offset(struct intel_mipmap_tree *mt,
	GLuint face, GLuint level)
	{
	if (mt->target == GL_TEXTURE_CUBE_MAP_ARB)
	return (mt->level[level].level_offset +
	mt->level[level].image_offset[face]);
	else
	return mt->level[level].level_offset;
	}



	/**
	* Map a teximage in a mipmap tree.
	* \param row_stride returns row stride in bytes
	* \param image_stride returns image stride in bytes (for 3D textures).
	* \param image_offsets pointer to array of pixel offsets from the returned
	* pointer to each depth image
	* \return address of mapping
	*/
	GLubyte *
	intel_miptree_image_map(struct intel_context * intel,
	struct intel_mipmap_tree * mt,
	GLuint face,
	GLuint level,
	GLuint * row_stride, GLuint * image_offsets)
	{
	DBG("%s \n", __FUNCTION__);

	if (row_stride)
	row_stride = mt->pitch mt->cpp;

	if (mt->target == GL_TEXTURE_3D) {
	int i;

	for (i = 0; i < mt->level[level].depth; i++)
	image_offsets[i] = mt->level[level].image_offset[i] / mt->cpp;
	} else {
	assert(mt->level[level].depth == 1);
	assert(mt->target == GL_TEXTURE_CUBE_MAP \|\|
	mt->level[level].image_offset[0] == 0);
	image_offsets[0] = 0;
	}

	return (intel_region_map(intel, mt->region) +
	intel_miptree_image_offset(mt, face, level));
	}

	void
	intel_miptree_image_unmap(struct intel_context *intel,
	struct intel_mipmap_tree *mt)
	{
	DBG("%s\n", __FUNCTION__);
	intel_region_unmap(intel, mt->region);
	}



	/* Upload data for a particular image.
	*/
	void
	intel_miptree_image_data(struct intel_context *intel,
	struct intel_mipmap_tree *dst,
	GLuint face,
	GLuint level,
	void *src,
	GLuint src_row_pitch,
	GLuint src_image_pitch)
	{
	GLuint depth = dst->level[level].depth;
	GLuint dst_offset = intel_miptree_image_offset(dst, face, level);
	const GLuint *dst_depth_offset = intel_miptree_depth_offsets(dst, level);
	GLuint i;
	GLuint height = 0;

	DBG("%s: %d/%d\n", __FUNCTION__, face, level);
	for (i = 0; i < depth; i++) {
	height = dst->level[level].height;
	if(dst->compressed)
	height = (height + 3) / 4;
	intel_region_data(intel,
	dst->region,
	dst_offset + dst_depth_offset[i], /* dst_offset */
	0, 0, /* dstx, dsty */
	src,
	src_row_pitch,
	0, 0, /* source x, y */
	dst->level[level].width, height); /* width, height */

	src += src_image_pitch * dst->cpp;
	}
	}

	extern GLuint intel_compressed_alignment(GLenum);
	/* Copy mipmap image between trees
	*/
	void
	intel_miptree_image_copy(struct intel_context *intel,
	struct intel_mipmap_tree *dst,
	GLuint face, GLuint level,
	struct intel_mipmap_tree *src)
	{
	GLuint width = src->level[level].width;
	GLuint height = src->level[level].height;
	GLuint depth = src->level[level].depth;
	GLuint dst_offset = intel_miptree_image_offset(dst, face, level);
	GLuint src_offset = intel_miptree_image_offset(src, face, level);
	const GLuint *dst_depth_offset = intel_miptree_depth_offsets(dst, level);
	const GLuint *src_depth_offset = intel_miptree_depth_offsets(src, level);
	GLuint i;

	if (dst->compressed) {
	GLuint alignment = intel_compressed_alignment(dst->internal_format);
	height = (height + 3) / 4;
	width = ((width + alignment - 1) & ~(alignment - 1));
	}

	for (i = 0; i < depth; i++) {
	intel_region_copy(intel,
	dst->region, dst_offset + dst_depth_offset[i],
	0,
	0,
	src->region, src_offset + src_depth_offset[i],
	0, 0, width, height);
	}

	}