1// Copyright (c) 2015-2018 Khronos Group. This work is licensed under a 2// Creative Commons Attribution 4.0 International License; see 3// http://creativecommons.org/licenses/by/4.0/ 4 5[appendix] 6= Compressed Image Formats 7 8The compressed texture formats used by Vulkan are described in the 9specifically identified sections of the <<data-format,Khronos Data Format 10Specification>>, version 1.1. 11 12Unless otherwise described, the quantities encoded in these compressed 13formats are treated as normalized, unsigned values. 14 15Those formats listed as sRGB-encoded have in-memory representations of 16[eq]#R#, [eq]#G# and [eq]#B# components which are nonlinearly-encoded as 17[eq]#R'#, [eq]#G'#, and [eq]#B'#; any alpha component is unchanged. 18As part of filtering, the nonlinear [eq]#R'#, [eq]#G'#, and [eq]#B'# values 19are converted to linear [eq]#R#, [eq]#G#, and [eq]#B# components; any alpha 20component is unchanged. 21The conversion between linear and nonlinear encoding is performed as 22described in the "`KHR_DF_TRANSFER_SRGB`" section of the Khronos Data Format 23Specification. 24 25<<< 26 27[[appendix-compressedtex-bc]] 28== Block-Compressed Image Formats 29 30.Mapping of Vulkan BC formats to descriptions 31[width="90%",options="header",cols="5,4"] 32|==== 33| elink:VkFormat | <<data-format,Khronos Data Format Specification>> description 342+^| Formats described in the "`S3TC Compressed Texture Image Formats`" chapter 35| ename:VK_FORMAT_BC1_RGB_UNORM_BLOCK |BC1 with no alpha 36| ename:VK_FORMAT_BC1_RGB_SRGB_BLOCK |BC1 with no alpha, sRGB-encoded 37| ename:VK_FORMAT_BC1_RGBA_UNORM_BLOCK|BC1 with alpha 38| ename:VK_FORMAT_BC1_RGBA_SRGB_BLOCK |BC1 with alpha, sRGB-encoded 39| ename:VK_FORMAT_BC2_UNORM_BLOCK |BC2 40| ename:VK_FORMAT_BC2_SRGB_BLOCK |BC2, sRGB-encoded 41| ename:VK_FORMAT_BC3_UNORM_BLOCK |BC3 42| ename:VK_FORMAT_BC3_SRGB_BLOCK |BC3, sRGB-encoded 432+^| Formats described in the "`RGTC Compressed Texture Image Formats`" chapter 44| ename:VK_FORMAT_BC4_UNORM_BLOCK |BC4 unsigned 45| ename:VK_FORMAT_BC4_SNORM_BLOCK |BC4 signed 46| ename:VK_FORMAT_BC5_UNORM_BLOCK |BC5 unsigned 47| ename:VK_FORMAT_BC5_SNORM_BLOCK |BC5 signed 482+^| Formats described in the "`BPTC Compressed Texture Image Formats`" chapter 49| ename:VK_FORMAT_BC6H_UFLOAT_BLOCK |BC6H (unsigned version) 50| ename:VK_FORMAT_BC6H_SFLOAT_BLOCK |BC6H (signed version) 51| ename:VK_FORMAT_BC7_UNORM_BLOCK |BC7 52| ename:VK_FORMAT_BC7_SRGB_BLOCK |BC7, sRGB-encoded 53|==== 54 55<<< 56 57[[appendix-compressedtex-etc2]] 58== ETC Compressed Image Formats 59 60The following formats are described in the "`ETC2 Compressed Texture Image 61Formats`" chapter of the <<data-format,Khronos Data Format Specification>>. 62 63.Mapping of Vulkan ETC formats to descriptions 64[options="header",cols="1,1"] 65|==== 66| elink:VkFormat | <<data-format,Khronos Data Format Specification>> description 67| ename:VK_FORMAT_ETC2_R8G8B8_UNORM_BLOCK |RGB ETC2 68| ename:VK_FORMAT_ETC2_R8G8B8_SRGB_BLOCK |RGB ETC2 with sRGB encoding 69| ename:VK_FORMAT_ETC2_R8G8B8A1_UNORM_BLOCK |RGB ETC2 with punch-through alpha 70| ename:VK_FORMAT_ETC2_R8G8B8A1_SRGB_BLOCK |RGB ETC2 with punch-through alpha and sRGB 71| ename:VK_FORMAT_ETC2_R8G8B8A8_UNORM_BLOCK |RGBA ETC2 72| ename:VK_FORMAT_ETC2_R8G8B8A8_SRGB_BLOCK |RGBA ETC2 with sRGB encoding 73| ename:VK_FORMAT_EAC_R11_UNORM_BLOCK |Unsigned R11 EAC 74| ename:VK_FORMAT_EAC_R11_SNORM_BLOCK |Signed R11 EAC 75| ename:VK_FORMAT_EAC_R11G11_UNORM_BLOCK |Unsigned RG11 EAC 76| ename:VK_FORMAT_EAC_R11G11_SNORM_BLOCK |Signed RG11 EAC 77|==== 78 79<<< 80 81[[appendix-compressedtex-astc]] 82== ASTC Compressed Image Formats 83 84ASTC formats are described in the "`ASTC Compressed Texture Image Formats`" 85chapter of the <<data-format,Khronos Data Format Specification>>. 86 87.Mapping of Vulkan ASTC formats to descriptions 88[width="75%",options="header",cols="63%,15%,22%"] 89|==== 90| elink:VkFormat ^| Compressed texel block dimensions ^| sRGB-encoded 91| ename:VK_FORMAT_ASTC_4x4_UNORM_BLOCK ^|[eq]#4 {times} 4# ^|No 92| ename:VK_FORMAT_ASTC_4x4_SRGB_BLOCK ^|[eq]#4 {times} 4# ^|Yes 93| ename:VK_FORMAT_ASTC_5x4_UNORM_BLOCK ^|[eq]#5 {times} 4# ^|No 94| ename:VK_FORMAT_ASTC_5x4_SRGB_BLOCK ^|[eq]#5 {times} 4# ^|Yes 95| ename:VK_FORMAT_ASTC_5x5_UNORM_BLOCK ^|[eq]#5 {times} 5# ^|No 96| ename:VK_FORMAT_ASTC_5x5_SRGB_BLOCK ^|[eq]#5 {times} 5# ^|Yes 97| ename:VK_FORMAT_ASTC_6x5_UNORM_BLOCK ^|[eq]#6 {times} 5# ^|No 98| ename:VK_FORMAT_ASTC_6x5_SRGB_BLOCK ^|[eq]#6 {times} 5# ^|Yes 99| ename:VK_FORMAT_ASTC_6x6_UNORM_BLOCK ^|[eq]#6 {times} 6# ^|No 100| ename:VK_FORMAT_ASTC_6x6_SRGB_BLOCK ^|[eq]#6 {times} 6# ^|Yes 101| ename:VK_FORMAT_ASTC_8x5_UNORM_BLOCK ^|[eq]#8 {times} 5# ^|No 102| ename:VK_FORMAT_ASTC_8x5_SRGB_BLOCK ^|[eq]#8 {times} 5# ^|Yes 103| ename:VK_FORMAT_ASTC_8x6_UNORM_BLOCK ^|[eq]#8 {times} 6# ^|No 104| ename:VK_FORMAT_ASTC_8x6_SRGB_BLOCK ^|[eq]#8 {times} 6# ^|Yes 105| ename:VK_FORMAT_ASTC_8x8_UNORM_BLOCK ^|[eq]#8 {times} 8# ^|No 106| ename:VK_FORMAT_ASTC_8x8_SRGB_BLOCK ^|[eq]#8 {times} 8# ^|Yes 107| ename:VK_FORMAT_ASTC_10x5_UNORM_BLOCK ^|[eq]#10 {times} 5# ^|No 108| ename:VK_FORMAT_ASTC_10x5_SRGB_BLOCK ^|[eq]#10 {times} 5# ^|Yes 109| ename:VK_FORMAT_ASTC_10x6_UNORM_BLOCK ^|[eq]#10 {times} 6# ^|No 110| ename:VK_FORMAT_ASTC_10x6_SRGB_BLOCK ^|[eq]#10 {times} 6# ^|Yes 111| ename:VK_FORMAT_ASTC_10x8_UNORM_BLOCK ^|[eq]#10 {times} 8# ^|No 112| ename:VK_FORMAT_ASTC_10x8_SRGB_BLOCK ^|[eq]#10 {times} 8# ^|Yes 113| ename:VK_FORMAT_ASTC_10x10_UNORM_BLOCK ^|[eq]#10 {times} 10# ^|No 114| ename:VK_FORMAT_ASTC_10x10_SRGB_BLOCK ^|[eq]#10 {times} 10# ^|Yes 115| ename:VK_FORMAT_ASTC_12x10_UNORM_BLOCK ^|[eq]#12 {times} 10# ^|No 116| ename:VK_FORMAT_ASTC_12x10_SRGB_BLOCK ^|[eq]#12 {times} 10# ^|Yes 117| ename:VK_FORMAT_ASTC_12x12_UNORM_BLOCK ^|[eq]#12 {times} 12# ^|No 118| ename:VK_FORMAT_ASTC_12x12_SRGB_BLOCK ^|[eq]#12 {times} 12# ^|Yes 119|==== 120