/**************************************************************************
 * 
 * Copyright 2006 Tungsten Graphics, Inc., Cedar Park, Texas.
 * All Rights Reserved.
 * 
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 * copy of this software and associated documentation files (the
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 * 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
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#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.
 */

struct intel_texture_image;

/**
 * Describes the location of each texture image within a texture region.
 */
struct intel_mipmap_level
{
   /** Offset to this miptree level, used in computing x_offset. */
   GLuint level_x;
   /** Offset to this miptree level, used in computing y_offset. */
   GLuint level_y;
   GLuint width;
   GLuint height;
   /** Depth of the mipmap at this level: 1 for 1D/2D/CUBE, n for 3D. */
   GLuint depth;
   /** Number of images at this level: 1 for 1D/2D, 6 for CUBE, depth for 3D */
   GLuint nr_images;

   /** @{
    * offsets from level_[xy] to the image for each cube face or depth
    * level.
    *
    * 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 *x_offset, *y_offset;
   /** @} */
};

struct intel_mipmap_tree
{
   /* Effectively the key:
    */
   GLenum target;
   gl_format format;

   GLuint first_level;
   GLuint last_level;

   GLuint width0, height0, depth0; /**< Level zero image dimensions */
   GLuint cpp;
   bool compressed;

   /* Derived from the above:
    */
   GLuint total_width;
   GLuint total_height;

   /* Includes image offset tables:
    */
   struct intel_mipmap_level level[MAX_TEXTURE_LEVELS];

   /* The data is held here:
    */
   struct intel_region *region;

   /**
    * This points to an auxillary hiz region if all of the following hold:
    *     1. The texture has been attached to an FBO as a depthbuffer.
    *     2. The texture format is hiz compatible.
    *     3. The intel context supports hiz.
    *
    * When a texture is attached to multiple FBO's, a separate renderbuffer
    * wrapper is created for each attachment. This necessitates storing the
    * hiz region in the texture itself instead of the renderbuffer wrapper.
    *
    * \see intel_fbo.c:intel_wrap_texture()
    */
   struct intel_region *hiz_region;

   /* These are also refcounted:
    */
   GLuint refcount;
};



struct intel_mipmap_tree *intel_miptree_create(struct intel_context *intel,
                                               GLenum target,
					       gl_format format,
                                               GLuint first_level,
                                               GLuint last_level,
                                               GLuint width0,
                                               GLuint height0,
                                               GLuint depth0,
					       bool expect_accelerated_upload);

struct intel_mipmap_tree *
intel_miptree_create_for_region(struct intel_context *intel,
				GLenum target,
				gl_format format,
				struct intel_region *region);

int intel_miptree_pitch_align (struct intel_context *intel,
			       struct intel_mipmap_tree *mt,
			       uint32_t tiling,
			       int pitch);

void intel_miptree_reference(struct intel_mipmap_tree **dst,
                             struct intel_mipmap_tree *src);

void intel_miptree_release(struct intel_mipmap_tree **mt);

/* Check if an image fits an existing mipmap tree layout
 */
bool intel_miptree_match_image(struct intel_mipmap_tree *mt,
                                    struct gl_texture_image *image);

void
intel_miptree_get_image_offset(struct intel_mipmap_tree *mt,
			       GLuint level, GLuint face, GLuint depth,
			       GLuint *x, GLuint *y);

void
intel_miptree_get_dimensions_for_image(struct gl_texture_image *image,
                                       int *width, int *height, int *depth);

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);

void
intel_miptree_copy_teximage(struct intel_context *intel,
                            struct intel_texture_image *intelImage,
                            struct intel_mipmap_tree *dst_mt);

/* i915_mipmap_tree.c:
 */
void i915_miptree_layout(struct intel_mipmap_tree *mt);
void i945_miptree_layout(struct intel_mipmap_tree *mt);
void brw_miptree_layout(struct intel_context *intel,
			struct intel_mipmap_tree *mt);

#endif
