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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_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