120 lines
5.7 KiB
Plaintext
120 lines
5.7 KiB
Plaintext
// Copyright (c) 2015-2018 Khronos Group. This work is licensed under a
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// Creative Commons Attribution 4.0 International License; see
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// http://creativecommons.org/licenses/by/4.0/
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[appendix]
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= Compressed Image Formats
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The compressed texture formats used by Vulkan are described in the
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specifically identified sections of the <<data-format,Khronos Data Format
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Specification>>, version 1.1.
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Unless otherwise described, the quantities encoded in these compressed
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formats are treated as normalized, unsigned values.
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Those formats listed as sRGB-encoded have in-memory representations of
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[eq]#R#, [eq]#G# and [eq]#B# components which are nonlinearly-encoded as
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[eq]#R'#, [eq]#G'#, and [eq]#B'#; any alpha component is unchanged.
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As part of filtering, the nonlinear [eq]#R'#, [eq]#G'#, and [eq]#B'# values
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are converted to linear [eq]#R#, [eq]#G#, and [eq]#B# components; any alpha
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component is unchanged.
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The conversion between linear and nonlinear encoding is performed as
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described in the "`KHR_DF_TRANSFER_SRGB`" section of the Khronos Data Format
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Specification.
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<<<
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[[appendix-compressedtex-bc]]
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== Block-Compressed Image Formats
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.Mapping of Vulkan BC formats to descriptions
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[width="90%",options="header",cols="5,4"]
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|====
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| VkFormat | <<data-format,Khronos Data Format Specification>> description
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2+^| Formats described in the "`S3TC Compressed Texture Image Formats`" chapter
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| ename:VK_FORMAT_BC1_RGB_UNORM_BLOCK |BC1 with no alpha
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| ename:VK_FORMAT_BC1_RGB_SRGB_BLOCK |BC1 with no alpha, sRGB-encoded
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| ename:VK_FORMAT_BC1_RGBA_UNORM_BLOCK|BC1 with alpha
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| ename:VK_FORMAT_BC1_RGBA_SRGB_BLOCK |BC1 with alpha, sRGB-encoded
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| ename:VK_FORMAT_BC2_UNORM_BLOCK |BC2
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| ename:VK_FORMAT_BC2_SRGB_BLOCK |BC2, sRGB-encoded
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| ename:VK_FORMAT_BC3_UNORM_BLOCK |BC3
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| ename:VK_FORMAT_BC3_SRGB_BLOCK |BC3, sRGB-encoded
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2+^| Formats described in the "`RGTC Compressed Texture Image Formats`" chapter
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| ename:VK_FORMAT_BC4_UNORM_BLOCK |BC4 unsigned
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| ename:VK_FORMAT_BC4_SNORM_BLOCK |BC4 signed
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| ename:VK_FORMAT_BC5_UNORM_BLOCK |BC5 unsigned
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| ename:VK_FORMAT_BC5_SNORM_BLOCK |BC5 signed
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2+^| Formats described in the "`BPTC Compressed Texture Image Formats`" chapter
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| ename:VK_FORMAT_BC6H_UFLOAT_BLOCK |BC6H (unsigned version)
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| ename:VK_FORMAT_BC6H_SFLOAT_BLOCK |BC6H (signed version)
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| ename:VK_FORMAT_BC7_UNORM_BLOCK |BC7
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| ename:VK_FORMAT_BC7_SRGB_BLOCK |BC7, sRGB-encoded
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|====
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<<<
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[[appendix-compressedtex-etc2]]
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== ETC Compressed Image Formats
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The following formats are described in the "`ETC2 Compressed Texture Image
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Formats`" chapter of the <<data-format,Khronos Data Format Specification>>.
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.Mapping of Vulkan ETC formats to descriptions
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[options="header",cols="1,1"]
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|====
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| VkFormat | <<data-format,Khronos Data Format Specification>> description
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| ename:VK_FORMAT_ETC2_R8G8B8_UNORM_BLOCK |RGB ETC2
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| ename:VK_FORMAT_ETC2_R8G8B8_SRGB_BLOCK |RGB ETC2 with sRGB encoding
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| ename:VK_FORMAT_ETC2_R8G8B8A1_UNORM_BLOCK |RGB ETC2 with punch-through alpha
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| ename:VK_FORMAT_ETC2_R8G8B8A1_SRGB_BLOCK |RGB ETC2 with punch-through alpha and sRGB
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| ename:VK_FORMAT_ETC2_R8G8B8A8_UNORM_BLOCK |RGBA ETC2
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| ename:VK_FORMAT_ETC2_R8G8B8A8_SRGB_BLOCK |RGBA ETC2 with sRGB encoding
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| ename:VK_FORMAT_EAC_R11_UNORM_BLOCK |Unsigned R11 EAC
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| ename:VK_FORMAT_EAC_R11_SNORM_BLOCK |Signed R11 EAC
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| ename:VK_FORMAT_EAC_R11G11_UNORM_BLOCK |Unsigned RG11 EAC
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| ename:VK_FORMAT_EAC_R11G11_SNORM_BLOCK |Signed RG11 EAC
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|====
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<<<
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[[appendix-compressedtex-astc]]
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== ASTC Compressed Image Formats
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ASTC formats are described in the "`ASTC Compressed Texture Image Formats`"
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chapter of the <<data-format,Khronos Data Format Specification>>.
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.Mapping of Vulkan ASTC formats to descriptions
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[width="75%",options="header",cols="63%,15%,22%"]
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|====
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| VkFormat ^| Compressed texel block dimensions ^| sRGB-encoded
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| ename:VK_FORMAT_ASTC_4x4_UNORM_BLOCK ^|[eq]#4 {times} 4# ^|No
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| ename:VK_FORMAT_ASTC_4x4_SRGB_BLOCK ^|[eq]#4 {times} 4# ^|Yes
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| ename:VK_FORMAT_ASTC_5x4_UNORM_BLOCK ^|[eq]#5 {times} 4# ^|No
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| ename:VK_FORMAT_ASTC_5x4_SRGB_BLOCK ^|[eq]#5 {times} 4# ^|Yes
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| ename:VK_FORMAT_ASTC_5x5_UNORM_BLOCK ^|[eq]#5 {times} 5# ^|No
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| ename:VK_FORMAT_ASTC_5x5_SRGB_BLOCK ^|[eq]#5 {times} 5# ^|Yes
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| ename:VK_FORMAT_ASTC_6x5_UNORM_BLOCK ^|[eq]#6 {times} 5# ^|No
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| ename:VK_FORMAT_ASTC_6x5_SRGB_BLOCK ^|[eq]#6 {times} 5# ^|Yes
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| ename:VK_FORMAT_ASTC_6x6_UNORM_BLOCK ^|[eq]#6 {times} 6# ^|No
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| ename:VK_FORMAT_ASTC_6x6_SRGB_BLOCK ^|[eq]#6 {times} 6# ^|Yes
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| ename:VK_FORMAT_ASTC_8x5_UNORM_BLOCK ^|[eq]#8 {times} 5# ^|No
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| ename:VK_FORMAT_ASTC_8x5_SRGB_BLOCK ^|[eq]#8 {times} 5# ^|Yes
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| ename:VK_FORMAT_ASTC_8x6_UNORM_BLOCK ^|[eq]#8 {times} 6# ^|No
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| ename:VK_FORMAT_ASTC_8x6_SRGB_BLOCK ^|[eq]#8 {times} 6# ^|Yes
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| ename:VK_FORMAT_ASTC_8x8_UNORM_BLOCK ^|[eq]#8 {times} 8# ^|No
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| ename:VK_FORMAT_ASTC_8x8_SRGB_BLOCK ^|[eq]#8 {times} 8# ^|Yes
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| ename:VK_FORMAT_ASTC_10x5_UNORM_BLOCK ^|[eq]#10 {times} 5# ^|No
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| ename:VK_FORMAT_ASTC_10x5_SRGB_BLOCK ^|[eq]#10 {times} 5# ^|Yes
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| ename:VK_FORMAT_ASTC_10x6_UNORM_BLOCK ^|[eq]#10 {times} 6# ^|No
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| ename:VK_FORMAT_ASTC_10x6_SRGB_BLOCK ^|[eq]#10 {times} 6# ^|Yes
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| ename:VK_FORMAT_ASTC_10x8_UNORM_BLOCK ^|[eq]#10 {times} 8# ^|No
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| ename:VK_FORMAT_ASTC_10x8_SRGB_BLOCK ^|[eq]#10 {times} 8# ^|Yes
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| ename:VK_FORMAT_ASTC_10x10_UNORM_BLOCK ^|[eq]#10 {times} 10# ^|No
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| ename:VK_FORMAT_ASTC_10x10_SRGB_BLOCK ^|[eq]#10 {times} 10# ^|Yes
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| ename:VK_FORMAT_ASTC_12x10_UNORM_BLOCK ^|[eq]#12 {times} 10# ^|No
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| ename:VK_FORMAT_ASTC_12x10_SRGB_BLOCK ^|[eq]#12 {times} 10# ^|Yes
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| ename:VK_FORMAT_ASTC_12x12_UNORM_BLOCK ^|[eq]#12 {times} 12# ^|No
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| ename:VK_FORMAT_ASTC_12x12_SRGB_BLOCK ^|[eq]#12 {times} 12# ^|Yes
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|====
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