// Copyright (c) 2015-2017 The Khronos Group Inc. // Copyright notice at https://www.khronos.org/registry/speccopyright.html [appendix] = Compressed Image Formats The compressed texture formats used by Vulkan are described in the specifically identified sections of the <>, version 1.1. Unless otherwise described, the quantities encoded in these compressed formats are treated as normalized, unsigned values. Those formats listed as sRGB-encoded have in-memory representations of [eq]#R#, [eq]#G# and [eq]#B# components which are nonlinearly-encoded as [eq]#R'#, [eq]#G'#, and [eq]#B'#; any alpha component is unchanged. As part of filtering, the nonlinear [eq]#R'#, [eq]#G'#, and [eq]#B'# values are converted to linear [eq]#R#, [eq]#G#, and [eq]#B# components; any alpha component is unchanged. The conversion between linear and nonlinear encoding is performed as described in the "`KHR_DF_TRANSFER_SRGB`" section of the Khronos Data Format Specification. <<< [[appendix-compressedtex-bc]] == Block-Compressed Image Formats .Mapping of Vulkan BC formats to descriptions [width="90%",options="header",cols="5,4"] |==== | VkFormat | <> description 2+^| Formats described in the "`S3TC Compressed Texture Image Formats`" chapter | ename:VK_FORMAT_BC1_RGB_UNORM_BLOCK |BC1 with no alpha | ename:VK_FORMAT_BC1_RGB_SRGB_BLOCK |BC1 with no alpha, sRGB-encoded | ename:VK_FORMAT_BC1_RGBA_UNORM_BLOCK|BC1 with alpha | ename:VK_FORMAT_BC1_RGBA_SRGB_BLOCK |BC1 with alpha, sRGB-encoded | ename:VK_FORMAT_BC2_UNORM_BLOCK |BC2 | ename:VK_FORMAT_BC2_SRGB_BLOCK |BC2, sRGB-encoded | ename:VK_FORMAT_BC3_UNORM_BLOCK |BC3 | ename:VK_FORMAT_BC3_SRGB_BLOCK |BC3, sRGB-encoded 2+^| Formats described in the "`RGTC Compressed Texture Image Formats`" chapter | ename:VK_FORMAT_BC4_UNORM_BLOCK |BC4 unsigned | ename:VK_FORMAT_BC4_SNORM_BLOCK |BC4 signed | ename:VK_FORMAT_BC5_UNORM_BLOCK |BC5 unsigned | ename:VK_FORMAT_BC5_SNORM_BLOCK |BC5 signed 2+^| Formats described in the "`BPTC Compressed Texture Image Formats`" chapter | ename:VK_FORMAT_BC6H_UFLOAT_BLOCK |BC6H (unsigned version) | ename:VK_FORMAT_BC6H_SFLOAT_BLOCK |BC6H (signed version) | ename:VK_FORMAT_BC7_UNORM_BLOCK |BC7 | ename:VK_FORMAT_BC7_SRGB_BLOCK |BC7, sRGB-encoded |==== <<< [[appendix-compressedtex-etc2]] == ETC Compressed Image Formats The following formats are described in the "`ETC2 Compressed Texture Image Formats`" chapter of the <>. .Mapping of Vulkan ETC formats to descriptions [options="header",cols="1,1"] |==== | VkFormat | <> description | ename:VK_FORMAT_ETC2_R8G8B8_UNORM_BLOCK |RGB ETC2 | ename:VK_FORMAT_ETC2_R8G8B8_SRGB_BLOCK |RGB ETC2 with sRGB encoding | ename:VK_FORMAT_ETC2_R8G8B8A1_UNORM_BLOCK |RGB ETC2 with punch-through alpha | ename:VK_FORMAT_ETC2_R8G8B8A1_SRGB_BLOCK |RGB ETC2 with punch-through alpha and sRGB | ename:VK_FORMAT_ETC2_R8G8B8A8_UNORM_BLOCK |RGBA ETC2 | ename:VK_FORMAT_ETC2_R8G8B8A8_SRGB_BLOCK |RGBA ETC2 with sRGB encoding | ename:VK_FORMAT_EAC_R11_UNORM_BLOCK |Unsigned R11 EAC | ename:VK_FORMAT_EAC_R11_SNORM_BLOCK |Signed R11 EAC | ename:VK_FORMAT_EAC_R11G11_UNORM_BLOCK |Unsigned RG11 EAC | ename:VK_FORMAT_EAC_R11G11_SNORM_BLOCK |Signed RG11 EAC |==== <<< [[appendix-compressedtex-astc]] == ASTC Compressed Image Formats ASTC formats are described in the "`ASTC Compressed Texture Image Formats`" chapter of the <>. .Mapping of Vulkan ASTC formats to descriptions [width="75%",options="header",cols="63%,15%,22%"] |==== | VkFormat ^| Compressed texel block dimensions ^| sRGB-encoded | ename:VK_FORMAT_ASTC_4x4_UNORM_BLOCK ^|[eq]#4 {times} 4# ^|No | ename:VK_FORMAT_ASTC_4x4_SRGB_BLOCK ^|[eq]#4 {times} 4# ^|Yes | ename:VK_FORMAT_ASTC_5x4_UNORM_BLOCK ^|[eq]#5 {times} 4# ^|No | ename:VK_FORMAT_ASTC_5x4_SRGB_BLOCK ^|[eq]#5 {times} 4# ^|Yes | ename:VK_FORMAT_ASTC_5x5_UNORM_BLOCK ^|[eq]#5 {times} 5# ^|No | ename:VK_FORMAT_ASTC_5x5_SRGB_BLOCK ^|[eq]#5 {times} 5# ^|Yes | ename:VK_FORMAT_ASTC_6x5_UNORM_BLOCK ^|[eq]#6 {times} 5# ^|No | ename:VK_FORMAT_ASTC_6x5_SRGB_BLOCK ^|[eq]#6 {times} 5# ^|Yes | ename:VK_FORMAT_ASTC_6x6_UNORM_BLOCK ^|[eq]#6 {times} 6# ^|No | ename:VK_FORMAT_ASTC_6x6_SRGB_BLOCK ^|[eq]#6 {times} 6# ^|Yes | ename:VK_FORMAT_ASTC_8x5_UNORM_BLOCK ^|[eq]#8 {times} 5# ^|No | ename:VK_FORMAT_ASTC_8x5_SRGB_BLOCK ^|[eq]#8 {times} 5# ^|Yes | ename:VK_FORMAT_ASTC_8x6_UNORM_BLOCK ^|[eq]#8 {times} 6# ^|No | ename:VK_FORMAT_ASTC_8x6_SRGB_BLOCK ^|[eq]#8 {times} 6# ^|Yes | ename:VK_FORMAT_ASTC_8x8_UNORM_BLOCK ^|[eq]#8 {times} 8# ^|No | ename:VK_FORMAT_ASTC_8x8_SRGB_BLOCK ^|[eq]#8 {times} 8# ^|Yes | ename:VK_FORMAT_ASTC_10x5_UNORM_BLOCK ^|[eq]#10 {times} 5# ^|No | ename:VK_FORMAT_ASTC_10x5_SRGB_BLOCK ^|[eq]#10 {times} 5# ^|Yes | ename:VK_FORMAT_ASTC_10x6_UNORM_BLOCK ^|[eq]#10 {times} 6# ^|No | ename:VK_FORMAT_ASTC_10x6_SRGB_BLOCK ^|[eq]#10 {times} 6# ^|Yes | ename:VK_FORMAT_ASTC_10x8_UNORM_BLOCK ^|[eq]#10 {times} 8# ^|No | ename:VK_FORMAT_ASTC_10x8_SRGB_BLOCK ^|[eq]#10 {times} 8# ^|Yes | ename:VK_FORMAT_ASTC_10x10_UNORM_BLOCK ^|[eq]#10 {times} 10# ^|No | ename:VK_FORMAT_ASTC_10x10_SRGB_BLOCK ^|[eq]#10 {times} 10# ^|Yes | ename:VK_FORMAT_ASTC_12x10_UNORM_BLOCK ^|[eq]#12 {times} 10# ^|No | ename:VK_FORMAT_ASTC_12x10_SRGB_BLOCK ^|[eq]#12 {times} 10# ^|Yes | ename:VK_FORMAT_ASTC_12x12_UNORM_BLOCK ^|[eq]#12 {times} 12# ^|No | ename:VK_FORMAT_ASTC_12x12_SRGB_BLOCK ^|[eq]#12 {times} 12# ^|Yes |====