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22a5a1459f
* Update release number to 124.
Github Issues:
* Fix Makefile SPECREMARK macro to work when not building in a git tree
(public issue 992).
* Ignore pname:aspectMask for unused attachments in
slink:VkSubpassDescription2KHR valid usage statements (public pull
request 1028).
* Minor markup / spelling fixes (public pull requests 1035, 1045).
Internal Issues:
* Fix markup in Valid Usage statement for slink:VkCreateFramebuffer
(internal issue 1823).
* Add a new <<synchronization-signal-operation-order, _signal operation
order_>> section to the synchronization chapter which describes in
detail the ordering guarantees provided by the API between fence and
semaphore signal operations (internal merge request 3368).
* Move generated `appendix/meta/` files into the Makefile GENERATED
directory (internal merge request 3381).
New Extensions
* `<<VK_KHR_shader_clock>>`
* `<<VK_KHR_timeline_semaphore>>`
78 lines
2.7 KiB
Plaintext
78 lines
2.7 KiB
Plaintext
include::{generated}/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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* Extending elink:VkStructureType
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** ename:VK_STRUCTURE_TYPE_PIPELINE_COVERAGE_MODULATION_STATE_CREATE_INFO_NV
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=== New Enums
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* elink:VkCoverageModulationModeNV
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* tlink: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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