Function GetCompressedBlockSize

renderdoc/driver/gl/gl_resources.cpp:293–488

}

rdcfixedarray<uint32_t, 3> GetCompressedBlockSize(GLenum internalformat)
{
  if(!IsCompressedFormat(internalformat))
  {
    RDCERR("Not compressed format %s", ToStr(internalformat).c_str());
    return {1u, 1u, 1u};
  }

  uint32_t astc[3] = {0, 0, 1u};

  switch(internalformat)
  {
    // BC1
    case eGL_COMPRESSED_RGB_S3TC_DXT1_EXT:
    case eGL_COMPRESSED_RGBA_S3TC_DXT1_EXT:
    case eGL_COMPRESSED_SRGB_S3TC_DXT1_EXT:
    case eGL_COMPRESSED_SRGB_ALPHA_S3TC_DXT1_EXT:
    // BC2
    case eGL_COMPRESSED_RGBA_S3TC_DXT3_EXT:
    case eGL_COMPRESSED_SRGB_ALPHA_S3TC_DXT3_EXT:
    // BC3
    case eGL_COMPRESSED_RGBA_S3TC_DXT5_EXT:
    case eGL_COMPRESSED_SRGB_ALPHA_S3TC_DXT5_EXT:
    // BC4
    case eGL_COMPRESSED_RED_RGTC1:
    case eGL_COMPRESSED_SIGNED_RED_RGTC1:
    // BC5
    case eGL_COMPRESSED_RG_RGTC2:
    case eGL_COMPRESSED_SIGNED_RG_RGTC2:
    // BC6
    case eGL_COMPRESSED_RGB_BPTC_SIGNED_FLOAT_ARB:
    case eGL_COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT_ARB:
    // BC7
    case eGL_COMPRESSED_RGBA_BPTC_UNORM_ARB:
    case eGL_COMPRESSED_SRGB_ALPHA_BPTC_UNORM_ARB:
    // ETC1
    case eGL_ETC1_RGB8_OES:
    // ETC2
    case eGL_COMPRESSED_RGB8_ETC2:
    case eGL_COMPRESSED_SRGB8_ETC2:
    case eGL_COMPRESSED_RGB8_PUNCHTHROUGH_ALPHA1_ETC2:
    case eGL_COMPRESSED_SRGB8_PUNCHTHROUGH_ALPHA1_ETC2:
    // EAC
    case eGL_COMPRESSED_RGBA8_ETC2_EAC:
    case eGL_COMPRESSED_SRGB8_ALPHA8_ETC2_EAC:
    case eGL_COMPRESSED_R11_EAC:
    case eGL_COMPRESSED_SIGNED_R11_EAC:
    case eGL_COMPRESSED_RG11_EAC:
    case eGL_COMPRESSED_SIGNED_RG11_EAC: return {4u, 4u, 1u};
    // ASTC
    case eGL_COMPRESSED_RGBA_ASTC_4x4_KHR:
    case eGL_COMPRESSED_SRGB8_ALPHA8_ASTC_4x4_KHR:
      astc[0] = 4;
      astc[1] = 4;
      break;
    case eGL_COMPRESSED_RGBA_ASTC_5x4_KHR:
    case eGL_COMPRESSED_SRGB8_ALPHA8_ASTC_5x4_KHR:
      astc[0] = 5;