src/mesa/drivers/dri/intel/intel_mipmap_tree.h

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   3  * Copyright 2006 Tungsten Graphics, Inc., Cedar Park, Texas.
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  27
  28 #ifndef INTEL_MIPMAP_TREE_H
  29 #define INTEL_MIPMAP_TREE_H
  30
  31 #include "intel_regions.h"
  32
  33 /* A layer on top of the intel_regions code which adds:
  34  *
  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.
  37  * - More refcounting
  38  *     - maybe able to remove refcounting from intel_region?
  39  * - ?
  40  *
  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
  45  * independent offset.
  46  *
  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.
  53  *
  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.
  57  */
  58
  59 struct intel_texture_image;
  60
  61 /**
  62  * Describes the location of each texture image within a texture region.
  63  */
  64 struct intel_mipmap_level
  65 {
  66    /** Offset to this miptree level, used in computing x_offset. */
  67    GLuint level_x;
  68    /** Offset to this miptree level, used in computing y_offset. */
  69    GLuint level_y;
  70    GLuint width;
  71    GLuint height;
  72    /** Depth of the mipmap at this level: 1 for 1D/2D/CUBE, n for 3D. */
  73    GLuint depth;
  74    /** Number of images at this level: 1 for 1D/2D, 6 for CUBE, depth for 3D */
  75    GLuint nr_images;
  76
  77    /** @{
  78     * offsets from level_[xy] to the image for each cube face or depth
  79     * level.
  80     *
  81     * Pretty much have to accept that hardware formats
  82     * are going to be so diverse that there is no unified way to
  83     * compute the offsets of depth/cube images within a mipmap level,
  84     * so have to store them as a lookup table.
  85     */
  86    GLuint *x_offset, *y_offset;
  87    /** @} */
  88 };
  89
  90 struct intel_mipmap_tree
  91 {
  92    /* Effectively the key:
  93     */
  94    GLenum target;
  95    gl_format format;
  96
  97    GLuint first_level;
  98    GLuint last_level;
  99
 100    GLuint width0, height0, depth0; /**< Level zero image dimensions */
 101    GLuint cpp;
 102    GLboolean compressed;
 103
 104    /* Derived from the above:
 105     */
 106    GLuint total_width;
 107    GLuint total_height;
 108
 109    /* Includes image offset tables:
 110     */
 111    struct intel_mipmap_level level[MAX_TEXTURE_LEVELS];
 112
 113    /* The data is held here:
 114     */
 115    struct intel_region *region;
 116
 117    /**
 118     * This points to an auxillary hiz region if all of the following hold:
 119     *     1. The texture has been attached to an FBO as a depthbuffer.
 120     *     2. The texture format is hiz compatible.
 121     *     3. The intel context supports hiz.
 122     *
 123     * When a texture is attached to multiple FBO's, a separate renderbuffer
 124     * wrapper is created for each attachment. This necessitates storing the
 125     * hiz region in the texture itself instead of the renderbuffer wrapper.
 126     *
 127     * \see intel_fbo.c:intel_wrap_texture()
 128     */
 129    struct intel_region *hiz_region;
 130
 131    /* These are also refcounted:
 132     */
 133    GLuint refcount;
 134 };
 135
 136
 137
 138 struct intel_mipmap_tree *intel_miptree_create(struct intel_context *intel,
 139                                                GLenum target,
 140                                                gl_format format,
 141                                                GLuint first_level,
 142                                                GLuint last_level,
 143                                                GLuint width0,
 144                                                GLuint height0,
 145                                                GLuint depth0,
 146                                                GLboolean expect_accelerated_upload);
 147
 148 struct intel_mipmap_tree *
 149 intel_miptree_create_for_region(struct intel_context *intel,
 150                                 GLenum target,
 151                                 gl_format format,
 152                                 struct intel_region *region);
 153
 154 int intel_miptree_pitch_align (struct intel_context *intel,
 155                                struct intel_mipmap_tree *mt,
 156                                uint32_t tiling,
 157                                int pitch);
 158
 159 void intel_miptree_reference(struct intel_mipmap_tree **dst,
 160                              struct intel_mipmap_tree *src);
 161
 162 void intel_miptree_release(struct intel_mipmap_tree **mt);
 163
 164 /* Check if an image fits an existing mipmap tree layout
 165  */
 166 GLboolean intel_miptree_match_image(struct intel_mipmap_tree *mt,
 167                                     struct gl_texture_image *image);
 168
 169 void
 170 intel_miptree_get_image_offset(struct intel_mipmap_tree *mt,
 171                                GLuint level, GLuint face, GLuint depth,
 172                                GLuint *x, GLuint *y);
 173
 174 void
 175 intel_miptree_get_dimensions_for_image(struct gl_texture_image *image,
 176                                        int *width, int *height, int *depth);
 177
 178 void intel_miptree_set_level_info(struct intel_mipmap_tree *mt,
 179                                   GLuint level,
 180                                   GLuint nr_images,
 181                                   GLuint x, GLuint y,
 182                                   GLuint w, GLuint h, GLuint d);
 183
 184 void intel_miptree_set_image_offset(struct intel_mipmap_tree *mt,
 185                                     GLuint level,
 186                                     GLuint img, GLuint x, GLuint y);
 187
 188 void
 189 intel_miptree_copy_teximage(struct intel_context *intel,
 190                             struct intel_texture_image *intelImage,
 191                             struct intel_mipmap_tree *dst_mt);
 192
 193 /* i915_mipmap_tree.c:
 194  */
 195 void i915_miptree_layout(struct intel_mipmap_tree *mt);
 196 void i945_miptree_layout(struct intel_mipmap_tree *mt);
 197 void brw_miptree_layout(struct intel_context *intel,
 198                         struct intel_mipmap_tree *mt);
 199
 200 #endif