Contact
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Pat Brown nvpbrown
Other Extension Metadata
- Last Modified Date
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2018-07-19
- IP Status
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No known IP claims.
- Interactions and External Dependencies
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This extension requires
SPV_NV_compute_shader_derivatives -
This extension provides API support for
GL_NV_compute_shader_derivatives
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- Contributors
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Pat Brown, NVIDIA
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Description
This extension adds Vulkan support for the
SPV_NV_compute_shader_derivatives
SPIR-V extension.
The SPIR-V extension provides two new execution modes, both of which allow
compute shaders to use built-ins that evaluate compute derivatives
explicitly or implicitly.
Derivatives will be computed via differencing over a 2x2 group of shader
invocations.
The DerivativeGroupQuadsNV execution mode assembles shader invocations
into 2x2 groups, where each group has x and y coordinates of the local
invocation ID of the form (2m+{0,1}, 2n+{0,1}).
The DerivativeGroupLinearNV execution mode assembles shader invocations
into 2x2 groups, where each group has local invocation index values of the
form 4m+{0,1,2,3}.
New Enum Constants
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VK_NV_COMPUTE_SHADER_DERIVATIVES_EXTENSION_NAME -
VK_NV_COMPUTE_SHADER_DERIVATIVES_SPEC_VERSION -
Extending VkStructureType:
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VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_COMPUTE_SHADER_DERIVATIVES_FEATURES_NV
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Issues
(1) Should we specify that the groups of four shader invocations used for derivatives in a compute shader are the same groups of four invocations that form a “quad” in shader subgroups?
RESOLVED: Yes.
Document Notes
For more information, see the Vulkan Specification
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