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 <assert.h>
  32
  33 #include "intel_regions.h"
  34
  35 /* A layer on top of the intel_regions code which adds:
  36  *
  37  * - Code to size and layout a region to hold a set of mipmaps.
  38  * - Query to determine if a new image fits in an existing tree.
  39  * - More refcounting
  40  *     - maybe able to remove refcounting from intel_region?
  41  * - ?
  42  *
  43  * The fixed mipmap layout of intel hardware where one offset
  44  * specifies the position of all images in a mipmap hierachy
  45  * complicates the implementation of GL texture image commands,
  46  * compared to hardware where each image is specified with an
  47  * independent offset.
  48  *
  49  * In an ideal world, each texture object would be associated with a
  50  * single bufmgr buffer or 2d intel_region, and all the images within
  51  * the texture object would slot into the tree as they arrive.  The
  52  * reality can be a little messier, as images can arrive from the user
  53  * with sizes that don't fit in the existing tree, or in an order
  54  * where the tree layout cannot be guessed immediately.
  55  *
  56  * This structure encodes an idealized mipmap tree.  The GL image
  57  * commands build these where possible, otherwise store the images in
  58  * temporary system buffers.
  59  */
  60
  61 struct intel_texture_image;
  62
  63 /**
  64  * Describes the location of each texture image within a texture region.
  65  */
  66 struct intel_mipmap_level
  67 {
  68    /** Offset to this miptree level, used in computing x_offset. */
  69    GLuint level_x;
  70    /** Offset to this miptree level, used in computing y_offset. */
  71    GLuint level_y;
  72    GLuint width;
  73    GLuint height;
  74
  75    /**
  76     * \brief Number of 2D slices in this miplevel.
  77     *
  78     * The exact semantics of depth varies according to the texture target:
  79     *    - For GL_TEXTURE_CUBE_MAP, depth is 6.
  80     *    - For GL_TEXTURE_2D_ARRAY, depth is the number of array slices. It is
  81     *      identical for all miplevels in the texture.
  82     *    - For GL_TEXTURE_3D, it is the texture's depth at this miplevel. Its
  83     *      value, like width and height, varies with miplevel.
  84     *    - For other texture types, depth is 1.
  85     */
  86    GLuint depth;
  87
  88    /**
  89     * \brief List of 2D images in this mipmap level.
  90     *
  91     * This may be a list of cube faces, array slices in 2D array texture, or
  92     * layers in a 3D texture. The list's length is \c depth.
  93     */
  94    struct intel_mipmap_slice {
  95       /**
  96        * \name Offset to slice
  97        * \{
  98        *
  99        * Hardware formats are so diverse that that there is no unified way to
 100        * compute the slice offsets, so we store them in this table.
 101        *
 102        * The (x, y) offset to slice \c s at level \c l relative the miptrees
 103        * base address is
 104        * \code
 105        *     x = mt->level[l].slice[s].x_offset
 106        *     y = mt->level[l].slice[s].y_offset
 107        */
 108       GLuint x_offset;
 109       GLuint y_offset;
 110       /** \} */
 111    } *slice;
 112 };
 113
 114 struct intel_mipmap_tree
 115 {
 116    /* Effectively the key:
 117     */
 118    GLenum target;
 119    gl_format format;
 120
 121    GLuint first_level;
 122    GLuint last_level;
 123
 124    GLuint width0, height0, depth0; /**< Level zero image dimensions */
 125    GLuint cpp;
 126    bool compressed;
 127
 128    /* Derived from the above:
 129     */
 130    GLuint total_width;
 131    GLuint total_height;
 132
 133    /* Includes image offset tables:
 134     */
 135    struct intel_mipmap_level level[MAX_TEXTURE_LEVELS];
 136
 137    /* The data is held here:
 138     */
 139    struct intel_region *region;
 140
 141    /**
 142     * This points to an auxillary hiz region if all of the following hold:
 143     *     1. The texture has been attached to an FBO as a depthbuffer.
 144     *     2. The texture format is hiz compatible.
 145     *     3. The intel context supports hiz.
 146     *
 147     * When a texture is attached to multiple FBO's, a separate renderbuffer
 148     * wrapper is created for each attachment. This necessitates storing the
 149     * hiz region in the texture itself instead of the renderbuffer wrapper.
 150     *
 151     * \see intel_fbo.c:intel_wrap_texture()
 152     */
 153    struct intel_region *hiz_region;
 154
 155    /* These are also refcounted:
 156     */
 157    GLuint refcount;
 158 };
 159
 160
 161
 162 struct intel_mipmap_tree *intel_miptree_create(struct intel_context *intel,
 163                                                GLenum target,
 164                                                gl_format format,
 165                                                GLuint first_level,
 166                                                GLuint last_level,
 167                                                GLuint width0,
 168                                                GLuint height0,
 169                                                GLuint depth0,
 170                                                bool expect_accelerated_upload);
 171
 172 struct intel_mipmap_tree *
 173 intel_miptree_create_for_region(struct intel_context *intel,
 174                                 GLenum target,
 175                                 gl_format format,
 176                                 struct intel_region *region);
 177
 178 /**
 179  * Create a miptree appropriate as the storage for a non-texture renderbuffer.
 180  * The miptree has the following properties:
 181  *     - The target is GL_TEXTURE_2D.
 182  *     - There are no levels other than the base level 0.
 183  *     - Depth is 1.
 184  */
 185 struct intel_mipmap_tree*
 186 intel_miptree_create_for_renderbuffer(struct intel_context *intel,
 187                                       gl_format format,
 188                                       uint32_t tiling,
 189                                       uint32_t cpp,
 190                                       uint32_t width,
 191                                       uint32_t height);
 192
 193 /** \brief Assert that the level and layer are valid for the miptree. */
 194 static inline void
 195 intel_miptree_check_level_layer(struct intel_mipmap_tree *mt,
 196                                 uint32_t level,
 197                                 uint32_t layer)
 198 {
 199    assert(level >= mt->first_level);
 200    assert(level <= mt->last_level);
 201    assert(layer < mt->level[level].depth);
 202 }
 203
 204 int intel_miptree_pitch_align (struct intel_context *intel,
 205                                struct intel_mipmap_tree *mt,
 206                                uint32_t tiling,
 207                                int pitch);
 208
 209 void intel_miptree_reference(struct intel_mipmap_tree **dst,
 210                              struct intel_mipmap_tree *src);
 211
 212 void intel_miptree_release(struct intel_mipmap_tree **mt);
 213
 214 /* Check if an image fits an existing mipmap tree layout
 215  */
 216 bool intel_miptree_match_image(struct intel_mipmap_tree *mt,
 217                                     struct gl_texture_image *image);
 218
 219 void
 220 intel_miptree_get_image_offset(struct intel_mipmap_tree *mt,
 221                                GLuint level, GLuint face, GLuint depth,
 222                                GLuint *x, GLuint *y);
 223
 224 void
 225 intel_miptree_get_dimensions_for_image(struct gl_texture_image *image,
 226                                        int *width, int *height, int *depth);
 227
 228 void intel_miptree_set_level_info(struct intel_mipmap_tree *mt,
 229                                   GLuint level,
 230                                   GLuint x, GLuint y,
 231                                   GLuint w, GLuint h, GLuint d);
 232
 233 void intel_miptree_set_image_offset(struct intel_mipmap_tree *mt,
 234                                     GLuint level,
 235                                     GLuint img, GLuint x, GLuint y);
 236
 237 void
 238 intel_miptree_copy_teximage(struct intel_context *intel,
 239                             struct intel_texture_image *intelImage,
 240                             struct intel_mipmap_tree *dst_mt);
 241
 242 /* i915_mipmap_tree.c:
 243  */
 244 void i915_miptree_layout(struct intel_mipmap_tree *mt);
 245 void i945_miptree_layout(struct intel_mipmap_tree *mt);
 246 void brw_miptree_layout(struct intel_context *intel,
 247                         struct intel_mipmap_tree *mt);
 248
 249 #endif