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* Update release number to 122.
Internal Issues:
* Add style guide language on not using standalone `+` signs (internal
issue 736); not using leading whitespace for markup (internal issue
747); and on keeping descriptions of a single API in a contiguous block
of markup (internal issue 949), and apply them to the specification.
* Add a glossary definition of "`constant integral expression`", pointing
to the SPIR-V "`constant instruction`" definition (internal issue 1225).
* Many minor edits to improve writing style consistency and capture
additional style guidelines (internal issue 1553).
* Clarify that <<fragops-depth-write, depth writes are not performed>> if
there is no depth framebuffer attachment (internal issue 1771).
* Allow implementations to use rectangular line style of interpolation for
<<primsrast-lines-bresenham, wide Bresenham lines>>, though replicating
attributes is still preferred. Clarify that code:FragCoord is not
replicated (internal issue 1772).
* Resolve a contradiction in valid usage statements for
slink:VkImageCreateInfo and slink:VkImageStencilUsageCreateInfoEXT
(internal issue 1773).
* Add style guide discussion of markup for indented equations, and use
markup workaround for asciidoctor 2 compatibility (internal issue 1793).
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the extension appendix (internal issue 1801).
* Add a new checker script `scripts/xml_consistency.py`. This is not
currently run as part of internal CI (internal merge request 3285).
* Correct "`an`" -> "`a`" prepositions where needed (internal merge
request 3334).
* Clarify that the <<features-uniformBufferStandardLayout,
pname:uniformBufferStandardLayout>> feature is only required when the
extension defining it is supported (internal merge request 3341).
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(internal merge request 3324).
* Correct pname:maxDrawMeshTasksCount to 2^16^-1 in the <<limits-required,
Required Limits>> table (internal merge requests 3361).
New Extensions
* `<<VK_IMG_format_pvrtc>>` (public issue 512).
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// Copyright (c) 2015-2019 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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| elink: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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| elink: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="90%",options="header",cols="50%,15%,20%,15%"]
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|====
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| elink:VkFormat ^| Compressed texel block dimensions ^| sRGB-encoded ^| Profile
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| ename:VK_FORMAT_ASTC_4x4_UNORM_BLOCK ^|[eq]#4 {times} 4# ^|No ^| LDR
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| ename:VK_FORMAT_ASTC_4x4_SRGB_BLOCK ^|[eq]#4 {times} 4# ^|Yes ^| LDR
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| ename:VK_FORMAT_ASTC_5x4_UNORM_BLOCK ^|[eq]#5 {times} 4# ^|No ^| LDR
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| ename:VK_FORMAT_ASTC_5x4_SRGB_BLOCK ^|[eq]#5 {times} 4# ^|Yes ^| LDR
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| ename:VK_FORMAT_ASTC_5x5_UNORM_BLOCK ^|[eq]#5 {times} 5# ^|No ^| LDR
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| ename:VK_FORMAT_ASTC_5x5_SRGB_BLOCK ^|[eq]#5 {times} 5# ^|Yes ^| LDR
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| ename:VK_FORMAT_ASTC_6x5_UNORM_BLOCK ^|[eq]#6 {times} 5# ^|No ^| LDR
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| ename:VK_FORMAT_ASTC_6x5_SRGB_BLOCK ^|[eq]#6 {times} 5# ^|Yes ^| LDR
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| ename:VK_FORMAT_ASTC_6x6_UNORM_BLOCK ^|[eq]#6 {times} 6# ^|No ^| LDR
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| ename:VK_FORMAT_ASTC_6x6_SRGB_BLOCK ^|[eq]#6 {times} 6# ^|Yes ^| LDR
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| ename:VK_FORMAT_ASTC_8x5_UNORM_BLOCK ^|[eq]#8 {times} 5# ^|No ^| LDR
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| ename:VK_FORMAT_ASTC_8x5_SRGB_BLOCK ^|[eq]#8 {times} 5# ^|Yes ^| LDR
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| ename:VK_FORMAT_ASTC_8x6_UNORM_BLOCK ^|[eq]#8 {times} 6# ^|No ^| LDR
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| ename:VK_FORMAT_ASTC_8x6_SRGB_BLOCK ^|[eq]#8 {times} 6# ^|Yes ^| LDR
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| ename:VK_FORMAT_ASTC_8x8_UNORM_BLOCK ^|[eq]#8 {times} 8# ^|No ^| LDR
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| ename:VK_FORMAT_ASTC_8x8_SRGB_BLOCK ^|[eq]#8 {times} 8# ^|Yes ^| LDR
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| ename:VK_FORMAT_ASTC_10x5_UNORM_BLOCK ^|[eq]#10 {times} 5# ^|No ^| LDR
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| ename:VK_FORMAT_ASTC_10x5_SRGB_BLOCK ^|[eq]#10 {times} 5# ^|Yes ^| LDR
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| ename:VK_FORMAT_ASTC_10x6_UNORM_BLOCK ^|[eq]#10 {times} 6# ^|No ^| LDR
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| ename:VK_FORMAT_ASTC_10x6_SRGB_BLOCK ^|[eq]#10 {times} 6# ^|Yes ^| LDR
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| ename:VK_FORMAT_ASTC_10x8_UNORM_BLOCK ^|[eq]#10 {times} 8# ^|No ^| LDR
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| ename:VK_FORMAT_ASTC_10x8_SRGB_BLOCK ^|[eq]#10 {times} 8# ^|Yes ^| LDR
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| ename:VK_FORMAT_ASTC_10x10_UNORM_BLOCK ^|[eq]#10 {times} 10# ^|No ^| LDR
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| ename:VK_FORMAT_ASTC_10x10_SRGB_BLOCK ^|[eq]#10 {times} 10# ^|Yes ^| LDR
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| ename:VK_FORMAT_ASTC_12x10_UNORM_BLOCK ^|[eq]#12 {times} 10# ^|No ^| LDR
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| ename:VK_FORMAT_ASTC_12x10_SRGB_BLOCK ^|[eq]#12 {times} 10# ^|Yes ^| LDR
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| ename:VK_FORMAT_ASTC_12x12_UNORM_BLOCK ^|[eq]#12 {times} 12# ^|No ^| LDR
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| ename:VK_FORMAT_ASTC_12x12_SRGB_BLOCK ^|[eq]#12 {times} 12# ^|Yes ^| LDR
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ifdef::VK_EXT_texture_compression_astc_hdr[]
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| ename:VK_FORMAT_ASTC_4x4_SFLOAT_BLOCK_EXT ^|[eq]#4 {times} 4# ^|No ^| HDR
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| ename:VK_FORMAT_ASTC_5x4_SFLOAT_BLOCK_EXT ^|[eq]#5 {times} 4# ^|No ^| HDR
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| ename:VK_FORMAT_ASTC_5x5_SFLOAT_BLOCK_EXT ^|[eq]#5 {times} 5# ^|No ^| HDR
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| ename:VK_FORMAT_ASTC_6x5_SFLOAT_BLOCK_EXT ^|[eq]#6 {times} 5# ^|No ^| HDR
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| ename:VK_FORMAT_ASTC_6x6_SFLOAT_BLOCK_EXT ^|[eq]#6 {times} 6# ^|No ^| HDR
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| ename:VK_FORMAT_ASTC_8x5_SFLOAT_BLOCK_EXT ^|[eq]#8 {times} 5# ^|No ^| HDR
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| ename:VK_FORMAT_ASTC_8x6_SFLOAT_BLOCK_EXT ^|[eq]#8 {times} 6# ^|No ^| HDR
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| ename:VK_FORMAT_ASTC_8x8_SFLOAT_BLOCK_EXT ^|[eq]#8 {times} 8# ^|No ^| HDR
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| ename:VK_FORMAT_ASTC_10x5_SFLOAT_BLOCK_EXT ^|[eq]#10 {times} 5# ^|No ^| HDR
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| ename:VK_FORMAT_ASTC_10x6_SFLOAT_BLOCK_EXT ^|[eq]#10 {times} 6# ^|No ^| HDR
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| ename:VK_FORMAT_ASTC_10x8_SFLOAT_BLOCK_EXT ^|[eq]#10 {times} 8# ^|No ^| HDR
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| ename:VK_FORMAT_ASTC_10x10_SFLOAT_BLOCK_EXT ^|[eq]#10 {times} 10# ^|No ^| HDR
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| ename:VK_FORMAT_ASTC_12x10_SFLOAT_BLOCK_EXT ^|[eq]#12 {times} 10# ^|No ^| HDR
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| ename:VK_FORMAT_ASTC_12x12_SFLOAT_BLOCK_EXT ^|[eq]#12 {times} 12# ^|No ^| HDR
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endif::VK_EXT_texture_compression_astc_hdr[]
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|====
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ifdef::VK_EXT_astc_decode_mode[]
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=== ASTC decode mode
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If the `VK_EXT_astc_decode_mode` extension is enabled, the decode mode is
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determined as follows:
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.Mapping of Vulkan ASTC decoding format to ASTC decoding modes
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[width="75%",options="header",cols="75%,25%"]
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|====
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| elink:VkFormat ^| Decoding mode
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| ename:VK_FORMAT_R16G16B16A16_SFLOAT ^| decode_float16
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| ename:VK_FORMAT_R8G8B8A8_UNORM ^| decode_unorm8
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| ename:VK_FORMAT_E5B9G9R9_UFLOAT_PACK32 ^| decode_rgb9e5
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|====
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Otherwise, the ASTC decode mode is decode_float16.
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endif::VK_EXT_astc_decode_mode[]
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ifndef::VK_EXT_astc_decode_mode[]
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The ASTC decode mode is decode_float16.
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endif::VK_EXT_astc_decode_mode[]
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ifdef::VK_IMG_format_pvrtc[]
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<<<
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[[appendix-compressedtex-pvrtc]]
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== PVRTC Compressed Image Formats
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.Mapping of Vulkan PVRTC formats to descriptions
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[width="75%",options="header",cols="63%,15%,22%"]
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|====
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| elink:VkFormat ^| Compressed texel block dimensions ^| sRGB-encoded
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| ename:VK_FORMAT_PVRTC1_2BPP_UNORM_BLOCK_IMG ^|[eq]#8 {times} 4# ^|No
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| ename:VK_FORMAT_PVRTC1_4BPP_UNORM_BLOCK_IMG ^|[eq]#4 {times} 4# ^|No
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| ename:VK_FORMAT_PVRTC2_2BPP_UNORM_BLOCK_IMG ^|[eq]#8 {times} 4# ^|No
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| ename:VK_FORMAT_PVRTC2_4BPP_UNORM_BLOCK_IMG ^|[eq]#4 {times} 4# ^|No
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| ename:VK_FORMAT_PVRTC1_2BPP_SRGB_BLOCK_IMG ^|[eq]#8 {times} 4# ^|Yes
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| ename:VK_FORMAT_PVRTC1_4BPP_SRGB_BLOCK_IMG ^|[eq]#4 {times} 4# ^|Yes
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| ename:VK_FORMAT_PVRTC2_2BPP_SRGB_BLOCK_IMG ^|[eq]#8 {times} 4# ^|Yes
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| ename:VK_FORMAT_PVRTC2_4BPP_SRGB_BLOCK_IMG ^|[eq]#4 {times} 4# ^|Yes
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|====
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endif::VK_IMG_format_pvrtc[]
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