workbench/libs/mesa/src/gallium/auxiliary/util/u_linear.h

   1 /**************************************************************************
   2  *
   3  * Copyright 2009 VMware, Inc.
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  16  * of the Software.
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  27
  28 /**
  29  * Functions for converting tiled data to linear and vice versa.
  30  */
  31
  32
  33 #ifndef U_LINEAR_H
  34 #define U_LINEAR_H
  35
  36 #include "pipe/p_compiler.h"
  37 #include "pipe/p_format.h"
  38
  39 struct u_linear_format_block
  40 {
  41    /** Block size in bytes */
  42    unsigned size;
  43
  44    /** Block width in pixels */
  45    unsigned width;
  46
  47    /** Block height in pixels */
  48    unsigned height;
  49 };
  50
  51
  52 struct pipe_tile_info
  53 {
  54    unsigned size;
  55    unsigned stride;
  56
  57    /* The number of tiles */
  58    unsigned tiles_x;
  59    unsigned tiles_y;
  60
  61    /* size of each tile expressed in blocks */
  62    unsigned cols;
  63    unsigned rows;
  64
  65    /* Describe the tile in pixels */
  66    struct u_linear_format_block tile;
  67
  68    /* Describe each block within the tile */
  69    struct u_linear_format_block block;
  70 };
  71
  72 void pipe_linear_to_tile(size_t src_stride, const void *src_ptr,
  73                          struct pipe_tile_info *t, void  *dst_ptr);
  74
  75 void pipe_linear_from_tile(struct pipe_tile_info *t, const void *src_ptr,
  76                            size_t dst_stride, void *dst_ptr);
  77
  78 /**
  79  * Convenience function to fillout a pipe_tile_info struct.
  80  * @t info to fill out.
  81  * @block block info about pixel layout
  82  * @tile_width the width of the tile in pixels
  83  * @tile_height the height of the tile in pixels
  84  * @tiles_x number of tiles in x axis
  85  * @tiles_y number of tiles in y axis
  86  */
  87 void pipe_linear_fill_info(struct pipe_tile_info *t,
  88                            const struct u_linear_format_block *block,
  89                            unsigned tile_width, unsigned tile_height,
  90                            unsigned tiles_x, unsigned tiles_y);
  91
  92 static INLINE boolean pipe_linear_check_tile(const struct pipe_tile_info *t)
  93 {
  94    if (t->tile.size != t->block.size * t->cols * t->rows)
  95       return FALSE;
  96
  97    if (t->stride != t->block.size * t->cols * t->tiles_x)
  98       return FALSE;
  99
 100    if (t->size < t->stride * t->rows * t->tiles_y)
 101       return FALSE;
 102
 103    return TRUE;
 104 }
 105
 106 #endif /* U_LINEAR_H */