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
  60 /**
  61  * Describes the location of each texture image within a texture region.
  62  */
  63 struct intel_mipmap_level
  64 {
  65    /**
  66     * Byte offset to the base of this level.
  67     *
  68     * This is used for mipmap levels of 1D/2D/3D textures.  However, CUBE
  69     * layouts spread images around the whole tree, so the level offset is
  70     * always zero in that case.
  71     */
  72    GLuint level_offset;
  73    /** Offset to this miptree level, used in computing x_offset. */
  74    GLuint level_x;
  75    /** Offset to this miptree level, used in computing y_offset. */
  76    GLuint level_y;
  77    GLuint width;
  78    GLuint height;
  79    /** Depth of the mipmap at this level: 1 for 1D/2D/CUBE, n for 3D. */
  80    GLuint depth;
  81    /** Number of images at this level: 1 for 1D/2D, 6 for CUBE, depth for 3D */
  82    GLuint nr_images;
  83
  84    /**
  85     * Byte offset from level_offset to the image for each cube face or depth
  86     * level.
  87     *
  88     * Pretty much have to accept that hardware formats
  89     * are going to be so diverse that there is no unified way to
  90     * compute the offsets of depth/cube images within a mipmap level,
  91     * so have to store them as a lookup table.
  92     */
  93    GLuint *x_offset, *y_offset;
  94 };
  95
  96 struct intel_mipmap_tree
  97 {
  98    /* Effectively the key:
  99     */
 100    GLenum target;
 101    GLenum internal_format;
 102
 103    GLuint first_level;
 104    GLuint last_level;
 105
 106    GLuint width0, height0, depth0; /**< Level zero image dimensions */
 107    GLuint cpp;
 108    GLboolean compressed;
 109
 110    /* Derived from the above:
 111     */
 112    GLuint pitch;
 113    GLuint depth_pitch;          /* per-image on i945? */
 114    GLuint total_height;
 115
 116    /* Includes image offset tables:
 117     */
 118    struct intel_mipmap_level level[MAX_TEXTURE_LEVELS];
 119
 120    /* The data is held here:
 121     */
 122    struct intel_region *region;
 123
 124    /* These are also refcounted:
 125     */
 126    GLuint refcount;
 127 };
 128
 129
 130
 131 struct intel_mipmap_tree *intel_miptree_create(struct intel_context *intel,
 132                                                GLenum target,
 133                                                GLenum base_format,
 134                                                GLenum internal_format,
 135                                                GLuint first_level,
 136                                                GLuint last_level,
 137                                                GLuint width0,
 138                                                GLuint height0,
 139                                                GLuint depth0,
 140                                                GLuint cpp,
 141                                                GLuint compress_byte,
 142                                                GLboolean expect_accelerated_upload);
 143
 144 struct intel_mipmap_tree *
 145 intel_miptree_create_for_region(struct intel_context *intel,
 146                                 GLenum target,
 147                                 GLenum internal_format,
 148                                 GLuint first_level,
 149                                 GLuint last_level,
 150                                 struct intel_region *region,
 151                                 GLuint depth0,
 152                                 GLuint compress_byte);
 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_context *intel,
 163                            struct intel_mipmap_tree **mt);
 164
 165 /* Check if an image fits an existing mipmap tree layout
 166  */
 167 GLboolean intel_miptree_match_image(struct intel_mipmap_tree *mt,
 168                                     struct gl_texture_image *image,
 169                                     GLuint face, GLuint level);
 170
 171 /* Return a pointer to an image within a tree.  Return image stride as
 172  * well.
 173  */
 174 GLubyte *intel_miptree_image_map(struct intel_context *intel,
 175                                  struct intel_mipmap_tree *mt,
 176                                  GLuint face,
 177                                  GLuint level,
 178                                  GLuint * row_stride, GLuint * image_stride);
 179
 180 void intel_miptree_image_unmap(struct intel_context *intel,
 181                                struct intel_mipmap_tree *mt);
 182
 183 void
 184 intel_miptree_get_image_offset(struct intel_mipmap_tree *mt,
 185                                GLuint level, GLuint face, GLuint depth,
 186                                GLuint *x, GLuint *y);
 187
 188 void intel_miptree_set_level_info(struct intel_mipmap_tree *mt,
 189                                   GLuint level,
 190                                   GLuint nr_images,
 191                                   GLuint x, GLuint y,
 192                                   GLuint w, GLuint h, GLuint d);
 193
 194 void intel_miptree_set_image_offset(struct intel_mipmap_tree *mt,
 195                                     GLuint level,
 196                                     GLuint img, GLuint x, GLuint y);
 197
 198 /* Upload an image into a tree
 199  */
 200 void intel_miptree_image_data(struct intel_context *intel,
 201                               struct intel_mipmap_tree *dst,
 202                               GLuint face,
 203                               GLuint level,
 204                               void *src,
 205                               GLuint src_row_pitch, GLuint src_image_pitch);
 206
 207 /* Copy an image between two trees
 208  */
 209 void intel_miptree_image_copy(struct intel_context *intel,
 210                               struct intel_mipmap_tree *dst,
 211                               GLuint face, GLuint level,
 212                               struct intel_mipmap_tree *src);
 213
 214 /* i915_mipmap_tree.c:
 215  */
 216 GLboolean i915_miptree_layout(struct intel_context *intel,
 217                               struct intel_mipmap_tree *mt,
 218                               uint32_t tiling);
 219 GLboolean i945_miptree_layout(struct intel_context *intel,
 220                               struct intel_mipmap_tree *mt,
 221                               uint32_t tiling);
 222 GLboolean brw_miptree_layout(struct intel_context *intel,
 223                              struct intel_mipmap_tree *mt,
 224                              uint32_t tiling);
 225
 226 #endif