Extension and Version Dependencies
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Requires Vulkan 1.0
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Requires
VK_NV_framebuffer_mixed_samples
Other Extension Metadata
- Last Modified Date
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2019-01-29
- Contributors
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Kedarnath Thangudu, NVIDIA
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Jeff Bolz, NVIDIA
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Description
When using a framebuffer with mixed samples, a per-fragment coverage reduction operation is performed which generates a color sample mask from the coverage mask. This extension defines the following modes to control how this reduction is performed.
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Merge: When there are more raster samples than color samples, there is an implementation dependent association of each raster sample to a color sample. In the merge mode, the reduced color sample mask is computed such that the bit for each color sample is 1 if any of the associated bits in the fragment’s coverage is on, and 0 otherwise. This is the default mode.
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Truncate: When there are more raster samples (N) than color samples(M), there is one to one association of the first M raster samples to the M color samples and the coverage bits for the other raster samples are ignored.
When the number of raster samples is equal to the color samples, there is a one to one mapping between them in either of the above modes.
The new command
vkGetPhysicalDeviceSupportedFramebufferMixedSamplesCombinationsNV can
be used to query the various raster, color, depth/stencil sample count and
reduction mode combinations that are supported by the implementation.
This extension would allow an implementation to support the behavior of both
VK_NV_framebuffer_mixed_samples
and VK_AMD_mixed_attachment_samples
extensions simultaneously.
New Enum Constants
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VK_NV_COVERAGE_REDUCTION_MODE_EXTENSION_NAME
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VK_NV_COVERAGE_REDUCTION_MODE_SPEC_VERSION
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Extending VkStructureType:
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VK_STRUCTURE_TYPE_FRAMEBUFFER_MIXED_SAMPLES_COMBINATION_NV
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VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_COVERAGE_REDUCTION_MODE_FEATURES_NV
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VK_STRUCTURE_TYPE_PIPELINE_COVERAGE_REDUCTION_STATE_CREATE_INFO_NV
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Document Notes
For more information, see the Vulkan Specification
This page is a generated document. Fixes and changes should be made to the generator scripts, not directly.