79 lines
2.0 KiB
Plaintext
79 lines
2.0 KiB
Plaintext
include::meta/VK_EXT_post_depth_coverage.txt[]
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*Last Modified Date*::
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2017-07-17
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*Interactions and External Dependencies*::
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- This extension requires the
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https://www.khronos.org/registry/spir-v/extensions/KHR/SPV_KHR_post_depth_coverage.html[`SPV_KHR_post_depth_coverage`]
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SPIR-V extension.
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- This extension requires
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https://www.khronos.org/registry/OpenGL/extensions/ARB/ARB_post_depth_coverage.txt[`GL_ARB_post_depth_coverage`]
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or
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https://www.khronos.org/registry/OpenGL/extensions/EXT/EXT_post_depth_coverage.txt[`GL_EXT_post_depth_coverage`]
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for GLSL-based source languages.
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*Contributors*::
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- Jeff Bolz, NVIDIA
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This extension adds support for the following SPIR-V extension in Vulkan:
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* `SPV_KHR_post_depth_coverage`
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which allows the fragment shader to control whether values in the
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code:SampleMask built-in input variable reflect the coverage after the
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<<fragops-early,early per-fragment>> depth and stencil tests are applied.
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This extension adds a new code:PostDepthCoverage execution mode under the
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code:SampleMaskPostDepthCoverage capability.
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When this mode is specified along with code:EarlyFragmentTests, the value of
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an input variable decorated with the
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<<interfaces-builtin-variables-samplemask, code:SampleMask>> built-in
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reflects the coverage after the <<shaders-fragment-earlytest, early fragment
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tests>> are applied.
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Otherwise, it reflects the coverage before the depth and stencil tests.
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When using GLSL source-based shading languages, the code:post_depth_coverage
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layout qualifier from GL_ARB_post_depth_coverage or
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GL_EXT_post_depth_coverage maps to the code:PostDepthCoverage execution
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mode.
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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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None.
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=== New Structures
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None.
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=== New Functions
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None.
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=== New Built-In Variables
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None.
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=== New Variable Decoration
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None.
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=== New SPIR-V Capabilities
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* <<spirvenv-capabilities-table-postdepthcoverage,SampleMaskPostDepthCoverage>>
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=== Issues
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None yet.
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=== Version History
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* Revision 1, 2017-07-17 (Daniel Koch)
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- Internal revisions
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