PrimitiveShadingRateKHR
PrimitiveShadingRateKHR
Decorating a variable with the PrimitiveShadingRateKHR built-in
decoration will make that variable contain the
primitive fragment shading
rate.
The value written to the variable decorated with
PrimitiveShadingRateKHR by the last
pre-rasterization shader
stage in the pipeline is used as the
primitive fragment shading
rate.
Outputs in previous shader stages are ignored.
If the last active
pre-rasterization shader
stage shader entry point’s interface does not include a variable decorated
with PrimitiveShadingRateKHR, then it is as if the shader specified a
fragment shading rate value of 0, indicating a horizontal and vertical rate
of 1 pixel.
If a shader has PrimitiveShadingRateKHR in the output interface and
there is an execution path through the shader that does not write to it, its
value is undefined: for executions of the shader that take that path.
Valid Usage
VUID-PrimitiveShadingRateKHR-PrimitiveShadingRateKHR-04484
The PrimitiveShadingRateKHR decoration must be used only within
the MeshEXT, MeshNV, Vertex, or Geometry
Execution Model
VUID-PrimitiveShadingRateKHR-PrimitiveShadingRateKHR-04485
The variable decorated with PrimitiveShadingRateKHR must be
declared using the Output Storage Class
VUID-PrimitiveShadingRateKHR-PrimitiveShadingRateKHR-04486
The variable decorated with PrimitiveShadingRateKHR must be
declared as a scalar 32-bit integer value
VUID-PrimitiveShadingRateKHR-PrimitiveShadingRateKHR-04487
The value written to PrimitiveShadingRateKHR must include no more
than one of Vertical2Pixels and Vertical4Pixels
VUID-PrimitiveShadingRateKHR-PrimitiveShadingRateKHR-04488
The value written to PrimitiveShadingRateKHR must include no more
than one of Horizontal2Pixels and Horizontal4Pixels
VUID-PrimitiveShadingRateKHR-PrimitiveShadingRateKHR-04489
The value written to PrimitiveShadingRateKHR must not have any
bits set other than those defined by Fragment Shading Rate Flags
enumerants in the SPIR-V specification
VUID-PrimitiveShadingRateKHR-PrimitiveShadingRateKHR-07059
The variable decorated with PrimitiveShadingRateKHR within the
MeshEXT Execution Model must also be decorated with the
PerPrimitiveEXT decoration