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* Update release number to 83.
Public Issues:
* Use [%inline] directive for all SVGs to reduce file size (public pull
request 734).
* Convert XML `value` aliases into \<alias> tags (public pull request
747).
* Fix metadoc script showing non-selected extensions (public pull request
748).
* Reapply public pull request 742 to make
ename:VK_PIPELINE_STAGE_CONDITIONAL_RENDERING_BIT_EXT part of the
graphices pipeline (public pull request 749).
* Fix numerous typos related to accidental duplication of words (public
pull request 760).
* Fix `vk.xml` contact typos (public pull request 761).
Internal Issues:
* Add images to the <<Standard sample locations>> table (internal issue
1115).
* Add a definition of "`Inherited from`" precision in the
<<spirvenv-precision-operation, Precision and Operation of SPIR-V
Instructions>> section (internal issue 1314).
* Clarify that both built-in and user-defined variables count against the
location limits for shader interfaces in the
<<interfaces-iointerfaces-locations, Location Assignment>> section
(internal issue 1316).
* Merge "`required`" capabilities into the <<spirvenv-capabilities-table,
list of optional: SPIR-V capabilities>> (internal issue 1320).
* Relax the layout matching rules of descriptors referring to only a
single aspect of a depth/stencil image, by reference to the new
<<resources-image-layouts-matching-rule, Image Layout Matching Rules>>
section (internal issue 1346).
* Revert extension metadoc generator warning about name mismatches to a
diagnostic, due to annoying warnings in build output for conscious
choices we've made (internal issue 1351).
Other Issues:
* Reserve bits for pending vendor extensions.
* Make Vulkan consistent with SPIR-V regarding code:DepthReplacing and
code:FragDepth in the <<interfaces-builtin-variables, Built-In
Variables>> section.
* Add missing ChangeLog entries for the previous three spec updates.
77 lines
2.5 KiB
Plaintext
77 lines
2.5 KiB
Plaintext
include::meta/VK_NV_framebuffer_mixed_samples.txt[]
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*Last Modified Date*::
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2017-06-04
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*Contributors*::
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- Jeff Bolz, NVIDIA
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This extension allows multisample rendering with a raster and depth/stencil
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sample count that is larger than the color sample count.
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Rasterization and the results of the depth and stencil tests together
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determine the portion of a pixel that is "`covered`".
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It can be useful to evaluate coverage at a higher frequency than color
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samples are stored.
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This coverage is then "`reduced`" to a collection of covered color samples,
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each having an opacity value corresponding to the fraction of the color
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sample covered.
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The opacity can optionally be blended into individual color samples.
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Rendering with fewer color samples than depth/stencil samples greatly
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reduces the amount of memory and bandwidth consumed by the color buffer.
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However, converting the coverage values into opacity introduces artifacts
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where triangles share edges and may: not be suitable for normal triangle
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mesh rendering.
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One expected use case for this functionality is Stencil-then-Cover path
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rendering (similar to the OpenGL GL_NV_path_rendering extension).
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The stencil step determines the coverage (in the stencil buffer) for an
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entire path at the higher sample frequency, and then the cover step draws
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the path into the lower frequency color buffer using the coverage
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information to antialias path edges.
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With this two-step process, internal edges are fully covered when
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antialiasing is applied and there is no corruption on these edges.
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The key features of this extension are:
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* It allows render pass and framebuffer objects to be created where the
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number of samples in the depth/stencil attachment in a subpass is a
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multiple of the number of samples in the color attachments in the
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subpass.
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* A coverage reduction step is added to Fragment Operations which converts
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a set of covered raster/depth/stencil samples to a set of color samples
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that perform blending and color writes.
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The coverage reduction step also includes an optional coverage
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modulation step, multiplying color values by a fractional opacity
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corresponding to the number of associated raster/depth/stencil samples
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covered.
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=== New Object Types
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None.
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=== New Enum Constants
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None.
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=== New Enums
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* elink:VkCoverageModulationModeNV
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* elink:VkPipelineCoverageModulationStateCreateFlagsNV
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=== New Structures
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* slink:VkPipelineCoverageModulationStateCreateInfoNV
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=== New Functions
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None.
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=== Issues
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None.
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=== Version History
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* Revision 1, 2017-06-04 (Jeff Bolz)
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- Internal revisions
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