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82e0f83d43
* Bump API patch number and header version number to 40 for this update.
* There is a major build change in this release. We are now using the
Ruby-based ``asciidoctor'' implementation, rather than the Python-based
``asciidoc'' implementation, to process the specification. While the
actual specification markup changes were minimal, this requires a new
set of build tools and a very different installation process, especially
because we now use an experimental direct-to-PDF backend for Asciidoctor
instead of Docbook->dblatex->PDF. It is no longer possible to build the
Specification using asciidoc. See doc/specs/vulkan/README.adoc
for some guidance on installing the new toolchain components.
* There are some minor rendering issues in the PDF output due to teething
problems with the asciidoctor toolchain, especially with mathematical
equations. We are aware of these and working on them.
Github Issues:
* Updated sample code for the <<sparsememory-examples-basic,sparse
resource binding example>> (public issue 97).
* Modify line and point clipping behavior in the
<<vertexpostproc-clipping, Primitive Clipping>> section to allow for
pop-free behavior. The ability to check for which behavior is
implemented may be added a future feature or extension (public issue
113).
* Unify the discussions of implicit ordering throughout the spec, in
particular in the new sections <<drawing-primitive-order, Primitive
Order>>, <<primrast-order, Rasterization Order>>, and
<<synchronization-implicit, Implicit Synchronization Guarantees>>; the
discussion of <<synchronization-submission-order, submission order>>;
and references elsewhere to these sections (public issue 133).
* Clarify \<\<descriptorsets-compatibility,Pipeline Layout Compatibility>>
language and introduce the term ``identically defined'' (public issue
164).
* Add a dependency to the +VK_EXT_debug_marker+ extension that's needed to
reuse the object type enum from +VK_EXT_debug_report+, and moves the
definition of that enum into +VK_EXT_debug_report+ where it should be
(public issue 409).
* Remove redundant valid usage statement from slink:VkImageBlit (public
issue 421).
* Update GL_KHR_vulkan_glsl to allow the ternary operator to result in a
specialization constant (public issue 424).
* Fix valid usage for flink:VkPipelineShaderStageCreateInfo (public issue
426).
* Correct typo in New Objects list for <<VK_EXT_debug_report>> (public
issue 447).
Internal Issues:
* Moved to asciidoctor for spec builds (internal issue 121).
* Update style guide to describe where to put new extensions-specific
asciidoc files, and what to name them (internal issue 626).
* Add src/spec/indexExt.py to autogenerate registry index entries linking
into the 1.0-extensions specification, instead of maintaining the index
manually. (internal issue 642).
* Autogenerate extension dependencies and lists of all extensions and all
KHR extensions from the "supported" attributes in +vk.xml+. Execute
+make config/extDependency.sh+ from +doc/specs/vulkan+ when a supported
extension is added to vk.xml, to regenerate the dependency script. The
consequence is that specifying a single extension to the +makeExt+
script will automatically enable all extensions it depends on as well,
and that the +makeAllExts+ and +makeKHR+ scripts do not need to be
updated when a new extension is supported (internal issue 648).
* Put extension appendices all at the same asciidoc section level, so KHR
WSI extensions show up in the HTML index (internal issue 648).
Other Issues:
* Imbed images in the generated HTML specs instead of loading them from
the images/ directory.
* Fix missing EXT in extension name
(ename:VK_EXT_SWAPCHAIN_COLOR_SPACE_EXTENSION_NAME).
* Add new +VK_EXT_SMPTE_2086_metadata+ extension.
* In the <<platformCreateSurface_xlib,Xlib Surface>> section of the
+VK_KHR_xlib_surface+ specification, add language warning users that
they always need to call code:XinitThreads.
* Use the term "presentable image" (rather than "swapchain image")
consistently in +VK_KHR_swapchain+ and related extensions, and add a
glossary term defining it.
* Relocate the valid usage for samples of
flink:vkGetPhysicalDeviceSparseImageFormatProperties2KHR::pname:pFormatInfo
to be below the flink:VkPhysicalDeviceSparseImageFormatInfo2KHR
structure.
119 lines
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119 lines
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// Copyright (c) 2015-2017 The Khronos Group Inc.
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// Copyright notice at https://www.khronos.org/registry/speccopyright.html
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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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