intel_mipmap_tree.h

mesa-6.5-minigui源码

/**************************************************************************
 * 
 * Copyright 2006 Tungsten Graphics, Inc., Cedar Park, Texas.
 * All Rights Reserved.
 * 
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 * 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.
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 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
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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.
 */


/**
 * Describes the location of each texture image within a texture region.
 */
struct intel_mipmap_offset {
   GLuint offset; 
   GLuint width;
   GLuint height;
   GLuint depth;
   GLuint depth_image_stride;
};

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;
   struct intel_mipmap_offset offset[MAX_FACES][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,
						GLboolean compressed);

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 );

void intel_miptree_set_image_offset(struct intel_mipmap_tree *mt,
				    GLuint face,
				    GLuint level,
				    GLuint x, GLuint y,
				    GLuint w, GLuint h, GLuint d);

GLuint intel_miptree_depth_image_stride(struct intel_mipmap_tree *mt,
					GLuint face,
					GLuint level);



/* 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