svga3d_surfacedefs.h - Android社区 - https://www.androidos.net.cn/

/**************************************************************************
 *
 * Copyright � 1998-2015 VMware, Inc., Palo Alto, CA., USA
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
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 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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/*
 * svga3d_surfacedefs.h --
 *
 *       Surface/format/image helper code.
 */

#include "svga3d_reg.h"

#define max_t(type, x, y)  ((x) > (y) ? (x) : (y))

/*
 * enum svga3d_block_desc describes the active data channels in a block.
 *
 * There can be at-most four active channels in a block:
 *    1. Red, bump W, luminance and depth are stored in the first channel.
 *    2. Green, bump V and stencil are stored in the second channel.
 *    3. Blue and bump U are stored in the third channel.
 *    4. Alpha and bump Q are stored in the fourth channel.
 *
 * Block channels can be used to store compressed and buffer data:
 *    1. For compressed formats, only the data channel is used and its size
 *       is equal to that of a singular block in the compression scheme.
 *    2. For buffer formats, only the data channel is used and its size is
 *       exactly one byte in length.
 *    3. In each case the bit depth represent the size of a singular block.
 *
 * Note: Compressed and IEEE formats do not use the bitMask structure.
 */

enum svga3d_block_desc {

SVGA3DBLOCKDESC_NONE        = 0,         /* No channels are active */
   SVGA3DBLOCKDESC_BLUE        = 1 << 0,    /* Block with red channel data */
   SVGA3DBLOCKDESC_U           = 1 << 0,    /* Block with bump U channel data */
   SVGA3DBLOCKDESC_GREEN       = 1 << 1,    /* Block with green channel data */
   SVGA3DBLOCKDESC_V           = 1 << 1,    /* Block with bump V channel data */
   SVGA3DBLOCKDESC_RED         = 1 << 2,    /* Block with blue channel data */
   SVGA3DBLOCKDESC_W           = 1 << 2,    /* Block with bump W channel data */
   SVGA3DBLOCKDESC_LUMINANCE   = 1 << 2,    /* Block with luminance channel data */
   SVGA3DBLOCKDESC_Y           = 1 << 2,    /* Block with video luminance data */
   SVGA3DBLOCKDESC_ALPHA       = 1 << 3,    /* Block with an alpha channel */
   SVGA3DBLOCKDESC_Q           = 1 << 3,    /* Block with bump Q channel data */
   SVGA3DBLOCKDESC_BUFFER      = 1 << 4,    /* Block stores 1 byte of data */
   SVGA3DBLOCKDESC_COMPRESSED  = 1 << 5,    /* Block stores n bytes of data depending
                                               on the compression method used */
   SVGA3DBLOCKDESC_IEEE_FP     = 1 << 6,    /* Block stores data in an IEEE floating point
                                               representation in all channels */
   SVGA3DBLOCKDESC_UV_VIDEO    = 1 << 7,    /* Block with alternating video U and V */
   SVGA3DBLOCKDESC_PLANAR_YUV  = 1 << 8,    /* Three separate blocks store data. */
   SVGA3DBLOCKDESC_U_VIDEO     = 1 << 9,    /* Block with U video data */
   SVGA3DBLOCKDESC_V_VIDEO     = 1 << 10,   /* Block with V video data */
   SVGA3DBLOCKDESC_EXP         = 1 << 11,   /* Shared exponent */
   SVGA3DBLOCKDESC_SRGB        = 1 << 12,   /* Data is in sRGB format */
   SVGA3DBLOCKDESC_2PLANAR_YUV = 1 << 13,   /* 2 planes of Y, UV, e.g., NV12. */
   SVGA3DBLOCKDESC_3PLANAR_YUV = 1 << 14,   /* 3 planes of separate Y, U, V, e.g., YV12. */
   SVGA3DBLOCKDESC_DEPTH       = 1 << 15,   /* Block with depth channel */
   SVGA3DBLOCKDESC_STENCIL     = 1 << 16,   /* Block with a stencil channel */

SVGA3DBLOCKDESC_RG         = SVGA3DBLOCKDESC_RED |
                                SVGA3DBLOCKDESC_GREEN,
   SVGA3DBLOCKDESC_RGB        = SVGA3DBLOCKDESC_RG |
                                SVGA3DBLOCKDESC_BLUE,
   SVGA3DBLOCKDESC_RGB_SRGB   = SVGA3DBLOCKDESC_RGB |
                                SVGA3DBLOCKDESC_SRGB,
   SVGA3DBLOCKDESC_RGBA       = SVGA3DBLOCKDESC_RGB |
                                SVGA3DBLOCKDESC_ALPHA,
   SVGA3DBLOCKDESC_RGBA_SRGB  = SVGA3DBLOCKDESC_RGBA |
                                SVGA3DBLOCKDESC_SRGB,
   SVGA3DBLOCKDESC_UV         = SVGA3DBLOCKDESC_U |
                                SVGA3DBLOCKDESC_V,
   SVGA3DBLOCKDESC_UVL        = SVGA3DBLOCKDESC_UV |
                                SVGA3DBLOCKDESC_LUMINANCE,
   SVGA3DBLOCKDESC_UVW        = SVGA3DBLOCKDESC_UV |
                                SVGA3DBLOCKDESC_W,
   SVGA3DBLOCKDESC_UVWA       = SVGA3DBLOCKDESC_UVW |
                                SVGA3DBLOCKDESC_ALPHA,
   SVGA3DBLOCKDESC_UVWQ       = SVGA3DBLOCKDESC_U |
                                SVGA3DBLOCKDESC_V |
                                SVGA3DBLOCKDESC_W |
                                SVGA3DBLOCKDESC_Q,
   SVGA3DBLOCKDESC_LA         = SVGA3DBLOCKDESC_LUMINANCE |
                                SVGA3DBLOCKDESC_ALPHA,
   SVGA3DBLOCKDESC_R_FP       = SVGA3DBLOCKDESC_RED |
                                SVGA3DBLOCKDESC_IEEE_FP,
   SVGA3DBLOCKDESC_RG_FP      = SVGA3DBLOCKDESC_R_FP |
                                SVGA3DBLOCKDESC_GREEN,
   SVGA3DBLOCKDESC_RGB_FP     = SVGA3DBLOCKDESC_RG_FP |
                                SVGA3DBLOCKDESC_BLUE,
   SVGA3DBLOCKDESC_RGBA_FP    = SVGA3DBLOCKDESC_RGB_FP |
                                SVGA3DBLOCKDESC_ALPHA,
   SVGA3DBLOCKDESC_DS         = SVGA3DBLOCKDESC_DEPTH |
                                SVGA3DBLOCKDESC_STENCIL,
   SVGA3DBLOCKDESC_YUV        = SVGA3DBLOCKDESC_UV_VIDEO |
                                SVGA3DBLOCKDESC_Y,
   SVGA3DBLOCKDESC_AYUV       = SVGA3DBLOCKDESC_ALPHA |
                                SVGA3DBLOCKDESC_Y |
                                SVGA3DBLOCKDESC_U_VIDEO |
                                SVGA3DBLOCKDESC_V_VIDEO,
   SVGA3DBLOCKDESC_RGBE       = SVGA3DBLOCKDESC_RGB |
                                SVGA3DBLOCKDESC_EXP,
   SVGA3DBLOCKDESC_COMPRESSED_SRGB = SVGA3DBLOCKDESC_COMPRESSED |
                                     SVGA3DBLOCKDESC_SRGB,
   SVGA3DBLOCKDESC_NV12       = SVGA3DBLOCKDESC_PLANAR_YUV |
                                SVGA3DBLOCKDESC_2PLANAR_YUV,
   SVGA3DBLOCKDESC_YV12       = SVGA3DBLOCKDESC_PLANAR_YUV |
                                SVGA3DBLOCKDESC_3PLANAR_YUV,
};

typedef struct SVGA3dChannelDef {
  union {
      uint8 blue;
      uint8 u;
      uint8 uv_video;
      uint8 u_video;
   };
   union {
      uint8 green;
      uint8 v;
      uint8 stencil;
      uint8 v_video;
   };
   union {
      uint8 red;
      uint8 w;
      uint8 luminance;
      uint8 y;
      uint8 depth;
      uint8 data;
   };
   union {
      uint8 alpha;
      uint8 q;
      uint8 exp;
   };
} SVGA3dChannelDef;

struct svga3d_surface_desc {
   SVGA3dSurfaceFormat format;
   enum svga3d_block_desc block_desc;

SVGA3dSize block_size;
   uint32 bytes_per_block;
   uint32 pitch_bytes_per_block;

uint32 totalBitDepth;
   SVGA3dChannelDef bitDepth;
   SVGA3dChannelDef bitOffset;
};

static const struct svga3d_surface_desc svga3d_surface_descs[] = {
   {SVGA3D_FORMAT_INVALID, SVGA3DBLOCKDESC_NONE,
      {1, 1, 1},  0, 0,
      0, {{0}, {0}, {0}, {0}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_X8R8G8B8, SVGA3DBLOCKDESC_RGB,
      {1, 1, 1},  4, 4,
      24, {{8}, {8}, {8}, {0}},
      {{0}, {8}, {16}, {24}}},

{SVGA3D_A8R8G8B8, SVGA3DBLOCKDESC_RGBA,
      {1, 1, 1},  4, 4,
      32, {{8}, {8}, {8}, {8}},
      {{0}, {8}, {16}, {24}}},

{SVGA3D_R5G6B5, SVGA3DBLOCKDESC_RGB,
      {1, 1, 1},  2, 2,
      16, {{5}, {6}, {5}, {0}},
      {{0}, {5}, {11}, {0}}},

{SVGA3D_X1R5G5B5, SVGA3DBLOCKDESC_RGB,
      {1, 1, 1},  2, 2,
      15, {{5}, {5}, {5}, {0}},
      {{0}, {5}, {10}, {0}}},

{SVGA3D_A1R5G5B5, SVGA3DBLOCKDESC_RGBA,
      {1, 1, 1},  2, 2,
      16, {{5}, {5}, {5}, {1}},
      {{0}, {5}, {10}, {15}}},

{SVGA3D_A4R4G4B4, SVGA3DBLOCKDESC_RGBA,
      {1, 1, 1},  2, 2,
      16, {{4}, {4}, {4}, {4}},
      {{0}, {4}, {8}, {12}}},

{SVGA3D_Z_D32, SVGA3DBLOCKDESC_DEPTH,
      {1, 1, 1},  4, 4,
      32, {{0}, {0}, {32}, {0}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_Z_D16, SVGA3DBLOCKDESC_DEPTH,
      {1, 1, 1},  2, 2,
      16, {{0}, {0}, {16}, {0}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_Z_D24S8, SVGA3DBLOCKDESC_DS,
      {1, 1, 1},  4, 4,
      32, {{0}, {8}, {24}, {0}},
      {{0}, {24}, {0}, {0}}},

{SVGA3D_Z_D15S1, SVGA3DBLOCKDESC_DS,
      {1, 1, 1},  2, 2,
      16, {{0}, {1}, {15}, {0}},
      {{0}, {15}, {0}, {0}}},

{SVGA3D_LUMINANCE8, SVGA3DBLOCKDESC_LUMINANCE,
      {1, 1, 1},  1, 1,
      8, {{0}, {0}, {8}, {0}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_LUMINANCE4_ALPHA4, SVGA3DBLOCKDESC_LA,
    {1  , 1, 1},  1, 1,
      8, {{0}, {0}, {4}, {4}},
      {{0}, {0}, {0}, {4}}},

{SVGA3D_LUMINANCE16, SVGA3DBLOCKDESC_LUMINANCE,
      {1, 1, 1},  2, 2,
      16, {{0}, {0}, {16}, {0}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_LUMINANCE8_ALPHA8, SVGA3DBLOCKDESC_LA,
      {1, 1, 1},  2, 2,
      16, {{0}, {0}, {8}, {8}},
      {{0}, {0}, {0}, {8}}},

{SVGA3D_DXT1, SVGA3DBLOCKDESC_COMPRESSED,
      {4, 4, 1},  8, 8,
      64, {{0}, {0}, {64}, {0}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_DXT2, SVGA3DBLOCKDESC_COMPRESSED,
      {4, 4, 1},  16, 16,
      128, {{0}, {0}, {128}, {0}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_DXT3, SVGA3DBLOCKDESC_COMPRESSED,
      {4, 4, 1},  16, 16,
      128, {{0}, {0}, {128}, {0}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_DXT4, SVGA3DBLOCKDESC_COMPRESSED,
      {4, 4, 1},  16, 16,
      128, {{0}, {0}, {128}, {0}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_DXT5, SVGA3DBLOCKDESC_COMPRESSED,
      {4, 4, 1},  16, 16,
      128, {{0}, {0}, {128}, {0}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_BUMPU8V8, SVGA3DBLOCKDESC_UV,
      {1, 1, 1},  2, 2,
      16, {{0}, {0}, {8}, {8}},
      {{0}, {0}, {0}, {8}}},

{SVGA3D_BUMPL6V5U5, SVGA3DBLOCKDESC_UVL,
      {1, 1, 1},  2, 2,
      16, {{5}, {5}, {6}, {0}},
      {{11}, {6}, {0}, {0}}},

{SVGA3D_BUMPX8L8V8U8, SVGA3DBLOCKDESC_UVL,
      {1, 1, 1},  4, 4,
      32, {{8}, {8}, {8}, {0}},
      {{16}, {8}, {0}, {0}}},

{SVGA3D_FORMAT_DEAD1, SVGA3DBLOCKDESC_UVL,
      {0, 0, 0},  0, 0,
       0, {{0}, {0}, {0}, {0}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_ARGB_S10E5, SVGA3DBLOCKDESC_RGBA_FP,
      {1, 1, 1},  8, 8,
      64, {{16}, {16}, {16}, {16}},
      {{32}, {16}, {0}, {48}}},

{SVGA3D_ARGB_S23E8, SVGA3DBLOCKDESC_RGBA_FP,
      {1, 1, 1},  16, 16,
      128, {{32}, {32}, {32}, {32}},
      {{64}, {32}, {0}, {96}}},

{SVGA3D_A2R10G10B10, SVGA3DBLOCKDESC_RGBA,
      {1, 1, 1},  4, 4,
      32, {{10}, {10}, {10}, {2}},
      {{0}, {10}, {20}, {30}}},

{SVGA3D_V8U8, SVGA3DBLOCKDESC_UV,
      {1, 1, 1},  2, 2,
      16, {{8}, {8}, {0}, {0}},
      {{8}, {0}, {0}, {0}}},

{SVGA3D_Q8W8V8U8, SVGA3DBLOCKDESC_UVWQ,
      {1, 1, 1},  4, 4,
      32, {{8}, {8}, {8}, {8}},
      {{24}, {16}, {8}, {0}}},

{SVGA3D_CxV8U8, SVGA3DBLOCKDESC_UV,
      {1, 1, 1},  2, 2,
      16, {{8}, {8}, {0}, {0}},
      {{8}, {0}, {0}, {0}}},

{SVGA3D_X8L8V8U8, SVGA3DBLOCKDESC_UVL,
      {1, 1, 1},  4, 4,
      24, {{8}, {8}, {8}, {0}},
      {{16}, {8}, {0}, {0}}},

{SVGA3D_A2W10V10U10, SVGA3DBLOCKDESC_UVWA,
      {1, 1, 1},  4, 4,
      32, {{10}, {10}, {10}, {2}},
      {{0}, {10}, {20}, {30}}},

{SVGA3D_ALPHA8, SVGA3DBLOCKDESC_ALPHA,
      {1, 1, 1},  1, 1,
      8, {{0}, {0}, {0}, {8}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_R_S10E5, SVGA3DBLOCKDESC_R_FP,
      {1, 1, 1},  2, 2,
      16, {{0}, {0}, {16}, {0}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_R_S23E8, SVGA3DBLOCKDESC_R_FP,
      {1, 1, 1},  4, 4,
      32, {{0}, {0}, {32}, {0}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_RG_S10E5, SVGA3DBLOCKDESC_RG_FP,
      {1, 1, 1},  4, 4,
      32, {{0}, {16}, {16}, {0}},
      {{0}, {16}, {0}, {0}}},

{SVGA3D_RG_S23E8, SVGA3DBLOCKDESC_RG_FP,
      {1, 1, 1},  8, 8,
      64, {{0}, {32}, {32}, {0}},
      {{0}, {32}, {0}, {0}}},

{SVGA3D_BUFFER, SVGA3DBLOCKDESC_BUFFER,
      {1, 1, 1},  1, 1,
      8, {{0}, {0}, {8}, {0}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_Z_D24X8, SVGA3DBLOCKDESC_DEPTH,
      {1, 1, 1},  4, 4,
      32, {{0}, {0}, {24}, {0}},
      {{0}, {24}, {0}, {0}}},

{SVGA3D_V16U16, SVGA3DBLOCKDESC_UV,
      {1, 1, 1},  4, 4,
      32, {{16}, {16}, {0}, {0}},
      {{16}, {0}, {0}, {0}}},

{SVGA3D_G16R16, SVGA3DBLOCKDESC_RG,
      {1, 1, 1},  4, 4,
      32, {{0}, {16}, {16}, {0}},
      {{0}, {0}, {16}, {0}}},

{SVGA3D_A16B16G16R16, SVGA3DBLOCKDESC_RGBA,
      {1, 1, 1},  8, 8,
      64, {{16}, {16}, {16}, {16}},
      {{32}, {16}, {0}, {48}}},

{SVGA3D_UYVY, SVGA3DBLOCKDESC_YUV,
      {1, 1, 1},  2, 2,
      16, {{8}, {0}, {8}, {0}},
      {{0}, {0}, {8}, {0}}},

{SVGA3D_YUY2, SVGA3DBLOCKDESC_YUV,
      {1, 1, 1},  2, 2,
      16, {{8}, {0}, {8}, {0}},
      {{8}, {0}, {0}, {0}}},

{SVGA3D_NV12, SVGA3DBLOCKDESC_NV12,
      {2, 2, 1},  6, 2,
      48, {{0}, {0}, {48}, {0}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_AYUV, SVGA3DBLOCKDESC_AYUV,
      {1, 1, 1},  4, 4,
      32, {{8}, {8}, {8}, {8}},
      {{0}, {8}, {16}, {24}}},

{SVGA3D_R32G32B32A32_TYPELESS, SVGA3DBLOCKDESC_RGBA,
      {1, 1, 1},  16, 16,
      128, {{32}, {32}, {32}, {32}},
      {{64}, {32}, {0}, {96}}},

{SVGA3D_R32G32B32A32_UINT, SVGA3DBLOCKDESC_RGBA,
      {1, 1, 1},  16, 16,
      128, {{32}, {32}, {32}, {32}},
      {{64}, {32}, {0}, {96}}},

{SVGA3D_R32G32B32A32_SINT, SVGA3DBLOCKDESC_UVWQ,
      {1, 1, 1},  16, 16,
      128, {{32}, {32}, {32}, {32}},
      {{64}, {32}, {0}, {96}}},

{SVGA3D_R32G32B32_TYPELESS, SVGA3DBLOCKDESC_RGB,
      {1, 1, 1},  12, 12,
      96, {{32}, {32}, {32}, {0}},
      {{64}, {32}, {0}, {0}}},

{SVGA3D_R32G32B32_FLOAT, SVGA3DBLOCKDESC_RGB_FP,
      {1, 1, 1},  12, 12,
      96, {{32}, {32}, {32}, {0}},
      {{64}, {32}, {0}, {0}}},

{SVGA3D_R32G32B32_UINT, SVGA3DBLOCKDESC_RGB,
      {1, 1, 1},  12, 12,
      96, {{32}, {32}, {32}, {0}},
      {{64}, {32}, {0}, {0}}},

{SVGA3D_R32G32B32_SINT, SVGA3DBLOCKDESC_UVW,
      {1, 1, 1},  12, 12,
      96, {{32}, {32}, {32}, {0}},
      {{64}, {32}, {0}, {0}}},

{SVGA3D_R16G16B16A16_TYPELESS, SVGA3DBLOCKDESC_RGBA,
      {1, 1, 1},  8, 8,
      64, {{16}, {16}, {16}, {16}},
      {{32}, {16}, {0}, {48}}},

{SVGA3D_R16G16B16A16_UINT, SVGA3DBLOCKDESC_RGBA,
      {1, 1, 1},  8, 8,
      64, {{16}, {16}, {16}, {16}},
      {{32}, {16}, {0}, {48}}},

{SVGA3D_R16G16B16A16_SNORM, SVGA3DBLOCKDESC_UVWQ,
      {1, 1, 1},  8, 8,
      64, {{16}, {16}, {16}, {16}},
      {{32}, {16}, {0}, {48}}},

{SVGA3D_R16G16B16A16_SINT, SVGA3DBLOCKDESC_UVWQ,
      {1, 1, 1},  8, 8,
      64, {{16}, {16}, {16}, {16}},
      {{32}, {16}, {0}, {48}}},

{SVGA3D_R32G32_TYPELESS, SVGA3DBLOCKDESC_RG,
      {1, 1, 1},  8, 8,
      64, {{0}, {32}, {32}, {0}},
      {{0}, {32}, {0}, {0}}},

{SVGA3D_R32G32_UINT, SVGA3DBLOCKDESC_RG,
      {1, 1, 1},  8, 8,
      64, {{0}, {32}, {32}, {0}},
      {{0}, {32}, {0}, {0}}},

{SVGA3D_R32G32_SINT, SVGA3DBLOCKDESC_UV,
      {1, 1, 1},  8, 8,
      64, {{0}, {32}, {32}, {0}},
      {{0}, {32}, {0}, {0}}},

{SVGA3D_R32G8X24_TYPELESS, SVGA3DBLOCKDESC_RG,
      {1, 1, 1},  8, 8,
      64, {{0}, {8}, {32}, {0}},
      {{0}, {32}, {0}, {0}}},

{SVGA3D_D32_FLOAT_S8X24_UINT, SVGA3DBLOCKDESC_DS,
      {1, 1, 1},  8, 8,
      64, {{0}, {8}, {32}, {0}},
      {{0}, {32}, {0}, {0}}},

{SVGA3D_R32_FLOAT_X8X24, SVGA3DBLOCKDESC_R_FP,
      {1, 1, 1},  8, 8,
      64, {{0}, {0}, {32}, {0}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_X32_G8X24_UINT, SVGA3DBLOCKDESC_GREEN,
      {1, 1, 1},  8, 8,
      64, {{0}, {8}, {0}, {0}},
      {{0}, {32}, {0}, {0}}},

{SVGA3D_R10G10B10A2_TYPELESS, SVGA3DBLOCKDESC_RGBA,
      {1, 1, 1},  4, 4,
      32, {{10}, {10}, {10}, {2}},
      {{0}, {10}, {20}, {30}}},

{SVGA3D_R10G10B10A2_UINT, SVGA3DBLOCKDESC_RGBA,
      {1, 1, 1},  4, 4,
      32, {{10}, {10}, {10}, {2}},
      {{0}, {10}, {20}, {30}}},

{SVGA3D_R11G11B10_FLOAT, SVGA3DBLOCKDESC_RGB_FP,
      {1, 1, 1},  4, 4,
      32, {{10}, {11}, {11}, {0}},
      {{0}, {10}, {21}, {0}}},

{SVGA3D_R8G8B8A8_TYPELESS, SVGA3DBLOCKDESC_RGBA,
      {1, 1, 1},  4, 4,
      32, {{8}, {8}, {8}, {8}},
      {{16}, {8}, {0}, {24}}},

{SVGA3D_R8G8B8A8_UNORM, SVGA3DBLOCKDESC_RGBA,
      {1, 1, 1},  4, 4,
      32, {{8}, {8}, {8}, {8}},
      {{16}, {8}, {0}, {24}}},

{SVGA3D_R8G8B8A8_UNORM_SRGB, SVGA3DBLOCKDESC_RGBA_SRGB,
      {1, 1, 1},  4, 4,
      32, {{8}, {8}, {8}, {8}},
      {{16}, {8}, {0}, {24}}},

{SVGA3D_R8G8B8A8_UINT, SVGA3DBLOCKDESC_RGBA,
      {1, 1, 1},  4, 4,
      32, {{8}, {8}, {8}, {8}},
      {{16}, {8}, {0}, {24}}},

{SVGA3D_R8G8B8A8_SINT, SVGA3DBLOCKDESC_RGBA,
      {1, 1, 1},  4, 4,
      32, {{8}, {8}, {8}, {8}},
      {{16}, {8}, {0}, {24}}},

{SVGA3D_R16G16_TYPELESS, SVGA3DBLOCKDESC_RG,
      {1, 1, 1},  4, 4,
      32, {{0}, {16}, {16}, {0}},
      {{0}, {16}, {0}, {0}}},

{SVGA3D_R16G16_UINT, SVGA3DBLOCKDESC_RG_FP,
      {1, 1, 1},  4, 4,
      32, {{0}, {16}, {16}, {0}},
      {{0}, {16}, {0}, {0}}},

{SVGA3D_R16G16_SINT, SVGA3DBLOCKDESC_UV,
      {1, 1, 1},  4, 4,
      32, {{0}, {16}, {16}, {0}},
      {{0}, {16}, {0}, {0}}},

{SVGA3D_R32_TYPELESS, SVGA3DBLOCKDESC_RED,
      {1, 1, 1},  4, 4,
      32, {{0}, {0}, {32}, {0}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_D32_FLOAT, SVGA3DBLOCKDESC_DEPTH,
      {1, 1, 1},  4, 4,
      32, {{0}, {0}, {32}, {0}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_R32_UINT, SVGA3DBLOCKDESC_RED,
      {1, 1, 1},  4, 4,
      32, {{0}, {0}, {32}, {0}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_R32_SINT, SVGA3DBLOCKDESC_RED,
      {1, 1, 1},  4, 4,
      32, {{0}, {0}, {32}, {0}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_R24G8_TYPELESS, SVGA3DBLOCKDESC_RG,
      {1, 1, 1},  4, 4,
      32, {{0}, {8}, {24}, {0}},
      {{0}, {24}, {0}, {0}}},

{SVGA3D_D24_UNORM_S8_UINT, SVGA3DBLOCKDESC_DS,
      {1, 1, 1},  4, 4,
      32, {{0}, {8}, {24}, {0}},
      {{0}, {24}, {0}, {0}}},

{SVGA3D_R24_UNORM_X8, SVGA3DBLOCKDESC_RED,
      {1, 1, 1},  4, 4,
      32, {{0}, {0}, {24}, {0}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_X24_G8_UINT, SVGA3DBLOCKDESC_GREEN,
      {1, 1, 1},  4, 4,
      32, {{0}, {8}, {0}, {0}},
      {{0}, {24}, {0}, {0}}},

{SVGA3D_R8G8_TYPELESS, SVGA3DBLOCKDESC_RG,
      {1, 1, 1},  2, 2,
      16, {{0}, {8}, {8}, {0}},
      {{0}, {8}, {0}, {0}}},

{SVGA3D_R8G8_UNORM, SVGA3DBLOCKDESC_RG,
      {1, 1, 1},  2, 2,
      16, {{0}, {8}, {8}, {0}},
      {{0}, {8}, {0}, {0}}},

{SVGA3D_R8G8_UINT, SVGA3DBLOCKDESC_RG,
      {1, 1, 1},  2, 2,
      16, {{0}, {8}, {8}, {0}},
      {{0}, {8}, {0}, {0}}},

{SVGA3D_R8G8_SINT, SVGA3DBLOCKDESC_UV,
      {1, 1, 1},  2, 2,
      16, {{0}, {8}, {8}, {0}},
      {{0}, {8}, {0}, {0}}},

{SVGA3D_R16_TYPELESS, SVGA3DBLOCKDESC_RED,
      {1, 1, 1},  2, 2,
      16, {{0}, {0}, {16}, {0}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_R16_UNORM, SVGA3DBLOCKDESC_RED,
      {1, 1, 1},  2, 2,
      16, {{0}, {0}, {16}, {0}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_R16_UINT, SVGA3DBLOCKDESC_RED,
      {1, 1, 1},  2, 2,
      16, {{0}, {0}, {16}, {0}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_R16_SNORM, SVGA3DBLOCKDESC_U,
      {1, 1, 1},  2, 2,
      16, {{0}, {0}, {16}, {0}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_R16_SINT, SVGA3DBLOCKDESC_U,
      {1, 1, 1},  2, 2,
      16, {{0}, {0}, {16}, {0}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_R8_TYPELESS, SVGA3DBLOCKDESC_RED,
      {1, 1, 1},  1, 1,
      8, {{0}, {0}, {8}, {0}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_R8_UNORM, SVGA3DBLOCKDESC_RED,
      {1, 1, 1},  1, 1,
      8, {{0}, {0}, {8}, {0}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_R8_UINT, SVGA3DBLOCKDESC_RED,
      {1, 1, 1},  1, 1,
      8, {{0}, {0}, {8}, {0}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_R8_SNORM, SVGA3DBLOCKDESC_U,
      {1, 1, 1},  1, 1,
      8, {{0}, {0}, {8}, {0}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_R8_SINT, SVGA3DBLOCKDESC_U,
      {1, 1, 1},  1, 1,
      8, {{0}, {0}, {8}, {0}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_P8, SVGA3DBLOCKDESC_RED,
      {1, 1, 1},  1, 1,
      8, {{0}, {0}, {8}, {0}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_R9G9B9E5_SHAREDEXP, SVGA3DBLOCKDESC_RGBE,
      {1, 1, 1},  4, 4,
      32, {{9}, {9}, {9}, {5}},
      {{18}, {9}, {0}, {27}}},

{SVGA3D_R8G8_B8G8_UNORM, SVGA3DBLOCKDESC_RG,
      {1, 1, 1},  2, 2,
      16, {{0}, {8}, {8}, {0}},
      {{0}, {8}, {0}, {0}}},

{SVGA3D_G8R8_G8B8_UNORM, SVGA3DBLOCKDESC_RG,
      {1, 1, 1},  2, 2,
      16, {{0}, {8}, {8}, {0}},
      {{0}, {8}, {0}, {0}}},

{SVGA3D_BC1_TYPELESS, SVGA3DBLOCKDESC_COMPRESSED,
      {4, 4, 1},  8, 8,
      64, {{0}, {0}, {64}, {0}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_BC1_UNORM_SRGB, SVGA3DBLOCKDESC_COMPRESSED_SRGB,
      {4, 4, 1},  8, 8,
      64, {{0}, {0}, {64}, {0}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_BC2_TYPELESS, SVGA3DBLOCKDESC_COMPRESSED,
      {4, 4, 1},  16, 16,
      128, {{0}, {0}, {128}, {0}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_BC2_UNORM_SRGB, SVGA3DBLOCKDESC_COMPRESSED_SRGB,
      {4, 4, 1},  16, 16,
      128, {{0}, {0}, {128}, {0}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_BC3_TYPELESS, SVGA3DBLOCKDESC_COMPRESSED,
      {4, 4, 1},  16, 16,
      128, {{0}, {0}, {128}, {0}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_BC3_UNORM_SRGB, SVGA3DBLOCKDESC_COMPRESSED_SRGB,
      {4, 4, 1},  16, 16,
      128, {{0}, {0}, {128}, {0}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_BC4_TYPELESS, SVGA3DBLOCKDESC_COMPRESSED,
      {4, 4, 1},  8, 8,
      64, {{0}, {0}, {64}, {0}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_ATI1, SVGA3DBLOCKDESC_COMPRESSED,
      {4, 4, 1},  8, 8,
      64, {{0}, {0}, {64}, {0}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_BC4_SNORM, SVGA3DBLOCKDESC_COMPRESSED,
      {4, 4, 1},  8, 8,
      64, {{0}, {0}, {64}, {0}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_BC5_TYPELESS, SVGA3DBLOCKDESC_COMPRESSED,
      {4, 4, 1},  16, 16,
      128, {{0}, {0}, {128}, {0}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_ATI2, SVGA3DBLOCKDESC_COMPRESSED,
      {4, 4, 1},  16, 16,
      128, {{0}, {0}, {128}, {0}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_BC5_SNORM, SVGA3DBLOCKDESC_COMPRESSED,
      {4, 4, 1},  16, 16,
      128, {{0}, {0}, {128}, {0}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_R10G10B10_XR_BIAS_A2_UNORM, SVGA3DBLOCKDESC_RGBA,
      {1, 1, 1},  4, 4,
      32, {{10}, {10}, {10}, {2}},
      {{0}, {10}, {20}, {30}}},

{SVGA3D_B8G8R8A8_TYPELESS, SVGA3DBLOCKDESC_RGBA,
      {1, 1, 1},  4, 4,
      32, {{8}, {8}, {8}, {8}},
      {{0}, {8}, {16}, {24}}},

{SVGA3D_B8G8R8A8_UNORM_SRGB, SVGA3DBLOCKDESC_RGBA_SRGB,
      {1, 1, 1},  4, 4,
      32, {{8}, {8}, {8}, {8}},
      {{0}, {8}, {16}, {24}}},

{SVGA3D_B8G8R8X8_TYPELESS, SVGA3DBLOCKDESC_RGB,
      {1, 1, 1},  4, 4,
      24, {{8}, {8}, {8}, {0}},
      {{0}, {8}, {16}, {24}}},

{SVGA3D_B8G8R8X8_UNORM_SRGB, SVGA3DBLOCKDESC_RGB_SRGB,
      {1, 1, 1},  4, 4,
      24, {{8}, {8}, {8}, {0}},
      {{0}, {8}, {16}, {24}}},

{SVGA3D_Z_DF16, SVGA3DBLOCKDESC_DEPTH,
      {1, 1, 1},  2, 2,
      16, {{0}, {0}, {16}, {0}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_Z_DF24, SVGA3DBLOCKDESC_DEPTH,
      {1, 1, 1},  4, 4,
      32, {{0}, {8}, {24}, {0}},
      {{0}, {24}, {0}, {0}}},

{SVGA3D_Z_D24S8_INT, SVGA3DBLOCKDESC_DS,
      {1, 1, 1},  4, 4,
      32, {{0}, {8}, {24}, {0}},
      {{0}, {24}, {0}, {0}}},

{SVGA3D_YV12, SVGA3DBLOCKDESC_YV12,
      {2, 2, 1},  6, 2,
      48, {{0}, {0}, {48}, {0}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_R32G32B32A32_FLOAT, SVGA3DBLOCKDESC_RGBA_FP,
      {1, 1, 1},  16, 16,
      128, {{32}, {32}, {32}, {32}},
      {{64}, {32}, {0}, {96}}},

{SVGA3D_R16G16B16A16_FLOAT, SVGA3DBLOCKDESC_RGBA_FP,
      {1, 1, 1},  8, 8,
      64, {{16}, {16}, {16}, {16}},
      {{32}, {16}, {0}, {48}}},

{SVGA3D_R16G16B16A16_UNORM, SVGA3DBLOCKDESC_RGBA,
      {1, 1, 1},  8, 8,
      64, {{16}, {16}, {16}, {16}},
      {{32}, {16}, {0}, {48}}},

{SVGA3D_R32G32_FLOAT, SVGA3DBLOCKDESC_RG_FP,
      {1, 1, 1},  8, 8,
      64, {{0}, {32}, {32}, {0}},
      {{0}, {32}, {0}, {0}}},

{SVGA3D_R10G10B10A2_UNORM, SVGA3DBLOCKDESC_RGBA,
      {1, 1, 1},  4, 4,
      32, {{10}, {10}, {10}, {2}},
      {{0}, {10}, {20}, {30}}},

{SVGA3D_R8G8B8A8_SNORM, SVGA3DBLOCKDESC_RGBA,
      {1, 1, 1},  4, 4,
      32, {{8}, {8}, {8}, {8}},
      {{24}, {16}, {8}, {0}}},

{SVGA3D_R16G16_FLOAT, SVGA3DBLOCKDESC_RG_FP,
      {1, 1, 1},  4, 4,
      32, {{0}, {16}, {16}, {0}},
      {{0}, {16}, {0}, {0}}},

{SVGA3D_R16G16_UNORM, SVGA3DBLOCKDESC_RG,
      {1, 1, 1},  4, 4,
      32, {{0}, {16}, {16}, {0}},
      {{0}, {0}, {16}, {0}}},

{SVGA3D_R16G16_SNORM, SVGA3DBLOCKDESC_RG,
      {1, 1, 1},  4, 4,
      32, {{16}, {16}, {0}, {0}},
      {{16}, {0}, {0}, {0}}},

{SVGA3D_R32_FLOAT, SVGA3DBLOCKDESC_R_FP,
      {1, 1, 1},  4, 4,
      32, {{0}, {0}, {32}, {0}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_R8G8_SNORM, SVGA3DBLOCKDESC_RG,
      {1, 1, 1},  2, 2,
      16, {{8}, {8}, {0}, {0}},
      {{8}, {0}, {0}, {0}}},

{SVGA3D_R16_FLOAT, SVGA3DBLOCKDESC_R_FP,
      {1, 1, 1},  2, 2,
      16, {{0}, {0}, {16}, {0}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_D16_UNORM, SVGA3DBLOCKDESC_DEPTH,
      {1, 1, 1},  2, 2,
      16, {{0}, {0}, {16}, {0}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_A8_UNORM, SVGA3DBLOCKDESC_ALPHA,
      {1, 1, 1},  1, 1,
      8, {{0}, {0}, {0}, {8}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_BC1_UNORM, SVGA3DBLOCKDESC_COMPRESSED,
      {4, 4, 1},  8, 8,
      64, {{0}, {0}, {64}, {0}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_BC2_UNORM, SVGA3DBLOCKDESC_COMPRESSED,
      {4, 4, 1},  16, 16,
      128, {{0}, {0}, {128}, {0}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_BC3_UNORM, SVGA3DBLOCKDESC_COMPRESSED,
      {4, 4, 1},  16, 16,
      128, {{0}, {0}, {128}, {0}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_B5G6R5_UNORM, SVGA3DBLOCKDESC_RGB,
      {1, 1, 1},  2, 2,
      16, {{5}, {6}, {5}, {0}},
      {{0}, {5}, {11}, {0}}},

{SVGA3D_B5G5R5A1_UNORM, SVGA3DBLOCKDESC_RGBA,
      {1, 1, 1},  2, 2,
      16, {{5}, {5}, {5}, {1}},
      {{0}, {5}, {10}, {15}}},

{SVGA3D_B8G8R8A8_UNORM, SVGA3DBLOCKDESC_RGBA,
      {1, 1, 1},  4, 4,
      32, {{8}, {8}, {8}, {8}},
      {{0}, {8}, {16}, {24}}},

{SVGA3D_B8G8R8X8_UNORM, SVGA3DBLOCKDESC_RGB,
      {1, 1, 1},  4, 4,
      24, {{8}, {8}, {8}, {0}},
      {{0}, {8}, {16}, {24}}},

{SVGA3D_BC4_UNORM, SVGA3DBLOCKDESC_COMPRESSED,
      {4, 4, 1},  8, 8,
      64, {{0}, {0}, {64}, {0}},
      {{0}, {0}, {0}, {0}}},

{SVGA3D_BC5_UNORM, SVGA3DBLOCKDESC_COMPRESSED,
      {4, 4, 1},  16, 16,
      128, {{0}, {0}, {128}, {0}},
      {{0}, {0}, {0}, {0}}},
};

extern const struct svga3d_surface_desc g_SVGA3dSurfaceDescs[];
extern int g_SVGA3dSurfaceDescs_size;

static inline uint32 clamped_umul32(uint32 a, uint32 b)
{
	uint64_t tmp = (uint64_t) a*b;
	return (tmp > (uint64_t) ((uint32) -1)) ? (uint32) -1 : tmp;
}

static inline uint32 clamped_uadd32(uint32 a, uint32 b)
{
	uint32 c = a + b;
	if (c < a || c < b) {
		return MAX_UINT32;
	}
	return c;
}

static inline const struct svga3d_surface_desc *
svga3dsurface_get_desc(SVGA3dSurfaceFormat format)
{
	if (format < ARRAY_SIZE(svga3d_surface_descs))
		return &svga3d_surface_descs[format];

return &svga3d_surface_descs[SVGA3D_FORMAT_INVALID];
}

/*
 *----------------------------------------------------------------------
 *
 * svga3dsurface_get_mip_size --
 *
 *      Given a base level size and the mip level, compute the size of
 *      the mip level.
 *
 * Results:
 *      See above.
 *
 * Side effects:
 *      None.
 *
 *----------------------------------------------------------------------
 */

static inline SVGA3dSize
svga3dsurface_get_mip_size(SVGA3dSize base_level, uint32 mip_level)
{
	SVGA3dSize size;

size.width = max_t(uint32, base_level.width >> mip_level, 1);
	size.height = max_t(uint32, base_level.height >> mip_level, 1);
	size.depth = max_t(uint32, base_level.depth >> mip_level, 1);
	return size;
}

static inline void
svga3dsurface_get_size_in_blocks(const struct svga3d_surface_desc *desc,
				 const SVGA3dSize *pixel_size,
				 SVGA3dSize *block_size)
{
	block_size->width = DIV_ROUND_UP(pixel_size->width,
					 desc->block_size.width);
	block_size->height = DIV_ROUND_UP(pixel_size->height,
					  desc->block_size.height);
	block_size->depth = DIV_ROUND_UP(pixel_size->depth,
					 desc->block_size.depth);
}

static inline bool
svga3dsurface_is_planar_surface(const struct svga3d_surface_desc *desc)
{
	return (desc->block_desc & SVGA3DBLOCKDESC_PLANAR_YUV) != 0;
}

static inline uint32
svga3dsurface_calculate_pitch(const struct svga3d_surface_desc *desc,
			      const SVGA3dSize *size)
{
	uint32 pitch;
	SVGA3dSize blocks;

svga3dsurface_get_size_in_blocks(desc, size, &blocks);

pitch = blocks.width * desc->pitch_bytes_per_block;

return pitch;
}

/*
 *-----------------------------------------------------------------------------
 *
 * svga3dsurface_get_image_buffer_size --
 *
 *      Return the number of bytes of buffer space required to store
 *      one image of a surface, optionally using the specified pitch.
 *
 *      If pitch is zero, it is assumed that rows are tightly packed.
 *
 *      This function is overflow-safe. If the result would have
 *      overflowed, instead we return MAX_UINT32.
 *
 * Results:
 *      Byte count.
 *
 * Side effects:
 *      None.
 *
 *-----------------------------------------------------------------------------
 */

static inline uint32
svga3dsurface_get_image_buffer_size(const struct svga3d_surface_desc *desc,
				    const SVGA3dSize *size,
				    uint32 pitch)
{
	SVGA3dSize image_blocks;
	uint32 slice_size, total_size;

svga3dsurface_get_size_in_blocks(desc, size, &image_blocks);

if (svga3dsurface_is_planar_surface(desc)) {
		total_size = clamped_umul32(image_blocks.width,
					    image_blocks.height);
		total_size = clamped_umul32(total_size, image_blocks.depth);
		total_size = clamped_umul32(total_size, desc->bytes_per_block);
		return total_size;
	}

if (pitch == 0)
		pitch = svga3dsurface_calculate_pitch(desc, size);

slice_size = clamped_umul32(image_blocks.height, pitch);
	total_size = clamped_umul32(slice_size, image_blocks.depth);

return total_size;
}

static inline uint32
svga3dsurface_get_image_offset(SVGA3dSurfaceFormat format,
                               SVGA3dSize baseLevelSize,
                               uint32 numMipLevels,
                               uint32 layer,
                               uint32 mip)

{
   uint32 offset;
   uint32 mipChainBytes;
   uint32 mipChainBytesToLevel;
   uint32 i;
   const struct svga3d_surface_desc *desc;
   SVGA3dSize mipSize;
   uint32 bytes;

desc = svga3dsurface_get_desc(format);

mipChainBytes = 0;
   mipChainBytesToLevel = 0;
   for (i = 0; i < numMipLevels; i++) {
      mipSize = svga3dsurface_get_mip_size(baseLevelSize, i);
      bytes = svga3dsurface_get_image_buffer_size(desc, &mipSize, 0);
      mipChainBytes += bytes;
      if (i < mip) {
         mipChainBytesToLevel += bytes;
      }
   }

offset = mipChainBytes * layer + mipChainBytesToLevel;

return offset;
}

static inline uint32
svga3dsurface_get_serialized_size(SVGA3dSurfaceFormat format,
				  SVGA3dSize base_level_size,
				  uint32 num_mip_levels,
                                  uint32 num_layers)
{
	const struct svga3d_surface_desc *desc = svga3dsurface_get_desc(format);
	uint64_t total_size = 0;
	uint32 mip;

for (mip = 0; mip < num_mip_levels; mip++) {
		SVGA3dSize size =
			svga3dsurface_get_mip_size(base_level_size, mip);
		total_size += svga3dsurface_get_image_buffer_size(desc,
								  &size, 0);
	}

total_size *= num_layers;

return (total_size > (uint64_t) MAX_UINT32) ? MAX_UINT32 : 
                                                      (uint32) total_size;
}

/**
 * Compute the offset (in bytes) to a pixel in an image (or volume).
 * 'width' is the image width in pixels
 * 'height' is the image height in pixels
 */
static inline uint32
svga3dsurface_get_pixel_offset(SVGA3dSurfaceFormat format,
                               uint32 width, uint32 height,
                               uint32 x, uint32 y, uint32 z)
{
   const struct svga3d_surface_desc *desc = svga3dsurface_get_desc(format);
   const uint32 bw = desc->block_size.width, bh = desc->block_size.height;
   const uint32 bd = desc->block_size.depth;
   const uint32 rowstride = DIV_ROUND_UP(width, bw) * desc->bytes_per_block;
   const uint32 imgstride = DIV_ROUND_UP(height, bh) * rowstride;
   const uint32 offset = (z / bd * imgstride +
                          y / bh * rowstride +
                          x / bw * desc->bytes_per_block);
   return offset;
}

C++程序 | 1124行 | 32.86 KB

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