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74 lines
2.4 KiB
Plaintext
74 lines
2.4 KiB
Plaintext
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include::meta/VK_NV_coverage_reduction_mode.txt[]
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*Last Modified Date*::
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2019-01-29
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*Contributors*::
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- Kedarnath Thangudu, NVIDIA
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- Jeff Bolz, NVIDIA
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When using a framebuffer with mixed samples, a per-fragment coverage
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reduction operation is performed which generates a color sample mask from
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the coverage mask.
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This extension defines the following modes to control how this reduction is
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performed.
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* Merge: When there are more raster samples than color samples, there is
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an implementation dependent association of each raster sample to a color
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sample.
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In the merge mode, the reduced color sample mask is computed such that
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the bit for each color sample is 1 if any of the associated bits in the
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fragment’s coverage is on, and 0 otherwise.
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This is the default mode.
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* Truncate: When there are more raster samples (N) than color samples(M),
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there is one to one association of the first M raster samples to the M
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color samples and the coverage bits for the other raster samples are
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ignored.
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When the number of raster samples is equal to the color samples, there is a
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one to one mapping between them in either of the above modes.
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The new command
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flink:vkGetPhysicalDeviceSupportedFramebufferMixedSamplesCombinationsNV can
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be used to query the various raster, color, depth/stencil sample count and
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reduction mode combinations that are supported by the implementation.
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This extension would allow an implementation to support the behavior of both
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`VK_NV_framebuffer_mixed_samples` and `VK_AMD_mixed_attachment_samples`
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extensions simultaneously.
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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_PHYSICAL_DEVICE_COVERAGE_REDUCTION_MODE_FEATURES_NV
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** ename:VK_STRUCTURE_TYPE_PIPELINE_COVERAGE_REDUCTION_STATE_CREATE_INFO_NV
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** ename:VK_STRUCTURE_TYPE_FRAMEBUFFER_MIXED_SAMPLES_COMBINATION_NV
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=== New Enums
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* elink:VkCoverageReductionModeNV
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* tlink:VkPipelineCoverageReductionStateCreateFlagsNV
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=== New Structures
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* slink:VkPhysicalDeviceCoverageReductionModeFeaturesNV
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* slink:VkPipelineCoverageReductionStateCreateInfoNV
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* slink:VkFramebufferMixedSamplesCombinationNV
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=== New Functions
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* flink:vkGetPhysicalDeviceSupportedFramebufferMixedSamplesCombinationsNV
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=== Issues
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None.
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=== Version History
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* Revision 1, 2019-01-29 (Kedarnath Thangudu)
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- Internal revisions
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