Name Strings
SPV_HUAWEI_subpass_shading
Contact
To report problems with this extension, please open a new issue at:
Contributors
-
Hueilong Wang, HUAWEI
Status
-
Draft
Version
Last Modified Date |
2021-04-20 |
Revision |
1 |
This extension is written against the SPIR-V Specification, Version 1.5, Revision 6, Unified.
This extension requires SPIR-V 1.0.
Overview
This extensions provides SPIR-V support for the GLSL GL_HUAWEI_subpass_shading extension which adds one new type of compute pipeline — subpass shading — which is allowed to access input attachments like a graphic pipeline in a subpass.
Extension Name
To use this extension within a SPIR-V module, the following OpExtension must be present in the module:
OpExtension "SPV_HUAWEI_subpass_shading"
New Capabilities
This extension introduces new capabilities:
SubpassShadingHUAWEI
Modifications to the SPIR-V Specification, Version 1.5
- (Modify Section 3.31, Capability, adding a row to the Capability table)
| Capability | Implicitly Declares | |
|---|---|---|
6272 |
SubpassShadingHUAWEI |
InputAttachment |
- (Modify InputAttachmentIndex to allow using this in a subpass shading shader, by changing the existing rule)
Only valid in the Fragment Execution Model and for variables of type OpTypeImage with a Dim operand of SubpassData.
to instead say
Only valid when the Execution Model is Fragment or GLCompute with SubpassShadingHUAWEI Capability, and for variables of type OpTypeImage with a Dim operand of SubpassData.
- (Modify OpTypeImage to allow using SubpassData in a subpass shading shader, by changing the existing rule)
If Dim is SubpassData, Sampled must be 2, Image Format must be Unknown, and the Execution Model must be Fragment.
to instead say
If Dim is SubpassData, Sampled must be 2, Image Format must be Unknown, and the Execution Model must be Fragment or GLCompute with SubpassShadingHUAWEI Capability.