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/**************************************************************************
*
* 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.
*
**************************************************************************/
#ifndef INTEL_MIPMAP_TREE_H
#define INTEL_MIPMAP_TREE_H
#include "intel_regions.h"
/* A layer on top of the intel_regions code which adds:
*
* - Code to size and layout a region to hold a set of mipmaps.
* - Query to determine if a new image fits in an existing tree.
* - More refcounting
* - maybe able to remove refcounting from intel_region?
* - ?
*
* The fixed mipmap layout of intel hardware where one offset
* specifies the position of all images in a mipmap hierachy
* complicates the implementation of GL texture image commands,
* compared to hardware where each image is specified with an
* independent offset.
*
* In an ideal world, each texture object would be associated with a
* single bufmgr buffer or 2d intel_region, and all the images within
* the texture object would slot into the tree as they arrive. The
* reality can be a little messier, as images can arrive from the user
* with sizes that don't fit in the existing tree, or in an order
* where the tree layout cannot be guessed immediately.
*
* This structure encodes an idealized mipmap tree. The GL image
* commands build these where possible, otherwise store the images in
* temporary system buffers.
*/
/**
* Describes the location of each texture image within a texture region.
*/
struct intel_mipmap_level
{
GLuint level_offset;
GLuint width;
GLuint height;
GLuint depth;
GLuint nr_images;
/* Explicitly store the offset of each image for each cube face or
* depth value. Pretty much have to accept that hardware formats
* are going to be so diverse that there is no unified way to
* compute the offsets of depth/cube images within a mipmap level,
* so have to store them as a lookup table:
*/
GLuint *image_offset;
};
struct intel_mipmap_tree
{
/* Effectively the key:
*/
GLenum target;
GLenum internal_format;
GLuint first_level;
GLuint last_level;
GLuint width0, height0, depth0; /**< Level zero image dimensions */
GLuint cpp;
GLboolean compressed;
/* Derived from the above:
*/
GLuint pitch;
GLuint depth_pitch; /* per-image on i945? */
GLuint total_height;
/* Includes image offset tables:
*/
struct intel_mipmap_level level[MAX_TEXTURE_LEVELS];
/* The data is held here:
*/
struct intel_region *region;
/* These are also refcounted:
*/
GLuint refcount;
};
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);
void intel_miptree_reference(struct intel_mipmap_tree **dst,
struct intel_mipmap_tree *src);
void intel_miptree_release(struct intel_context *intel,
struct intel_mipmap_tree **mt);
/* Check if an image fits an existing mipmap tree layout
*/
GLboolean intel_miptree_match_image(struct intel_mipmap_tree *mt,
struct gl_texture_image *image,
GLuint face, GLuint level);
/* Return a pointer to an image within a tree. Return image stride as
* well.
*/
GLubyte *intel_miptree_image_map(struct intel_context *intel,
struct intel_mipmap_tree *mt,
GLuint face,
GLuint level,
GLuint * row_stride, GLuint * image_stride);
void intel_miptree_image_unmap(struct intel_context *intel,
struct intel_mipmap_tree *mt);
/* Return the linear offset of an image relative to the start of the
* tree:
*/
GLuint intel_miptree_image_offset(struct intel_mipmap_tree *mt,
GLuint face, GLuint level);
/* Return pointers to each 2d slice within an image. Indexed by depth
* value.
*/
const GLuint *intel_miptree_depth_offsets(struct intel_mipmap_tree *mt,
GLuint level);
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);
void intel_miptree_set_image_offset(struct intel_mipmap_tree *mt,
GLuint level,
GLuint img, GLuint x, GLuint y);
/* Upload an image into a tree
*/
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);
/* Copy an image between two trees
*/
void intel_miptree_image_copy(struct intel_context *intel,
struct intel_mipmap_tree *dst,
GLuint face, GLuint level,
struct intel_mipmap_tree *src);
/* i915_mipmap_tree.c:
*/
GLboolean i915_miptree_layout(struct intel_mipmap_tree *mt);
GLboolean i945_miptree_layout(struct intel_mipmap_tree *mt);
#endif
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