1 /**************************************************************************
3 * Copyright 2006 Tungsten Graphics, Inc., Cedar Park, Texas.
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28 #ifndef INTEL_MIPMAP_TREE_H
29 #define INTEL_MIPMAP_TREE_H
31 #include "intel_regions.h"
33 /* A layer on top of the intel_regions code which adds:
35 * - Code to size and layout a region to hold a set of mipmaps.
36 * - Query to determine if a new image fits in an existing tree.
38 * - maybe able to remove refcounting from intel_region?
41 * The fixed mipmap layout of intel hardware where one offset
42 * specifies the position of all images in a mipmap hierachy
43 * complicates the implementation of GL texture image commands,
44 * compared to hardware where each image is specified with an
47 * In an ideal world, each texture object would be associated with a
48 * single bufmgr buffer or 2d intel_region, and all the images within
49 * the texture object would slot into the tree as they arrive. The
50 * reality can be a little messier, as images can arrive from the user
51 * with sizes that don't fit in the existing tree, or in an order
52 * where the tree layout cannot be guessed immediately.
54 * This structure encodes an idealized mipmap tree. The GL image
55 * commands build these where possible, otherwise store the images in
56 * temporary system buffers.
61 * Describes the location of each texture image within a texture region.
63 struct intel_mipmap_level
65 /** Offset to this miptree level, used in computing x_offset. */
67 /** Offset to this miptree level, used in computing y_offset. */
71 /** Depth of the mipmap at this level: 1 for 1D/2D/CUBE, n for 3D. */
73 /** Number of images at this level: 1 for 1D/2D, 6 for CUBE, depth for 3D */
77 * offsets from level_[xy] to the image for each cube face or depth
80 * Pretty much have to accept that hardware formats
81 * are going to be so diverse that there is no unified way to
82 * compute the offsets of depth/cube images within a mipmap level,
83 * so have to store them as a lookup table.
85 GLuint
*x_offset
, *y_offset
;
89 struct intel_mipmap_tree
91 /* Effectively the key:
99 GLuint width0
, height0
, depth0
; /**< Level zero image dimensions */
101 GLboolean compressed
;
103 /* Derived from the above:
108 /* Includes image offset tables:
110 struct intel_mipmap_level level
[MAX_TEXTURE_LEVELS
];
112 /* The data is held here:
114 struct intel_region
*region
;
117 * This points to an auxillary hiz region if all of the following hold:
118 * 1. The texture has been attached to an FBO as a depthbuffer.
119 * 2. The texture format is hiz compatible.
120 * 3. The intel context supports hiz.
122 * When a texture is attached to multiple FBO's, a separate renderbuffer
123 * wrapper is created for each attachment. This necessitates storing the
124 * hiz region in the texture itself instead of the renderbuffer wrapper.
126 * \see intel_fbo.c:intel_wrap_texture()
128 struct intel_region
*hiz_region
;
130 /* These are also refcounted:
137 struct intel_mipmap_tree
*intel_miptree_create(struct intel_context
*intel
,
145 GLboolean expect_accelerated_upload
);
147 struct intel_mipmap_tree
*
148 intel_miptree_create_for_region(struct intel_context
*intel
,
151 struct intel_region
*region
);
153 int intel_miptree_pitch_align (struct intel_context
*intel
,
154 struct intel_mipmap_tree
*mt
,
158 void intel_miptree_reference(struct intel_mipmap_tree
**dst
,
159 struct intel_mipmap_tree
*src
);
161 void intel_miptree_release(struct intel_mipmap_tree
**mt
);
163 /* Check if an image fits an existing mipmap tree layout
165 GLboolean
intel_miptree_match_image(struct intel_mipmap_tree
*mt
,
166 struct gl_texture_image
*image
);
169 intel_miptree_get_image_offset(struct intel_mipmap_tree
*mt
,
170 GLuint level
, GLuint face
, GLuint depth
,
171 GLuint
*x
, GLuint
*y
);
173 void intel_miptree_set_level_info(struct intel_mipmap_tree
*mt
,
177 GLuint w
, GLuint h
, GLuint d
);
179 void intel_miptree_set_image_offset(struct intel_mipmap_tree
*mt
,
181 GLuint img
, GLuint x
, GLuint y
);
183 /* Upload an image into a tree
185 void intel_miptree_image_data(struct intel_context
*intel
,
186 struct intel_mipmap_tree
*dst
,
190 GLuint src_row_pitch
, GLuint src_image_pitch
);
192 /* Copy an image between two trees
194 void intel_miptree_image_copy(struct intel_context
*intel
,
195 struct intel_mipmap_tree
*dst
,
196 GLuint face
, GLuint level
,
197 struct intel_mipmap_tree
*src
);
199 /* i915_mipmap_tree.c:
201 void i915_miptree_layout(struct intel_mipmap_tree
*mt
);
202 void i945_miptree_layout(struct intel_mipmap_tree
*mt
);
203 void brw_miptree_layout(struct intel_context
*intel
,
204 struct intel_mipmap_tree
*mt
);