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microsoft/compiler: Update header docs for binding modes supported by compiler

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Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/21913>
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Jesse Natalie 2023-02-27 13:57:35 -08:00 • committed by Marge Bot
parent 4fc7d2480a
commit 4f31d1a7e0
1 changed files with 9 additions and 6 deletions
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15
src/microsoft/compiler/nir_to_dxil.h
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@ -42,12 +42,13 @@ struct blob;
*/
enum dxil_environment {
/* In the GL environment:
* Samplers/textures are lowered, vars/intrinsics use binding to refer to them; dynamic array indexing not yet supported
* Samplers/textures are lowered, vars/intrinsics use binding to refer to them; dynamic array indexing supported with offset srcs
* The lowering done by mesa/st assigns bindings from 0 -> N
* All other resource variables have driver_location set instead, assigned from 0 -> N
* UBOs may or may not have interface variables, and are declared from ubo_binding_offset -> num_ubos; no dynamic indexing yet
* SSBOs may or may not have interface variables, and are declared from from 0 -> num_ssbos; no dynamic indexing yet
* UBOs may or may not have interface variables, and are declared from ubo_binding_offset -> num_ubos
* SSBOs may or may not have interface variables, and are declared from from 0 -> num_ssbos
* Images are *not* lowered, so that dynamic indexing can deterministically get a base binding via the deref chain
* TODO: Maybe support lowering and use nir_intrinsic_range_base to get the base
* No immediate constant buffer, or scratch
*/
DXIL_ENVIRONMENT_GL,
@ -63,10 +64,12 @@ enum dxil_environment {
DXIL_ENVIRONMENT_CL,
/* In the Vulkan environment:
* All resources use binding / descriptor_set for identification
* Samplers/textures/images are not lowered
* Deref chains are walked to emit the DXIL handle to the resource; dynamic indexing supported
* Samplers/textures/images support two modes:
* 1. Derefs: deref chains are walked to emit the DXIL handle to the resource; dynamic indexing supported
* 2. Bindless: the resource source is assumed as an index into a descriptor heap
* UBOs/SSBOs are struct variables in the NIR, accessed via vulkan_resource_index/load_vulkan_descriptor; dynamic indexing supported
* Read-only SSBOs, as declared in the SPIR-V, are bound as raw buffer SRVs instead of UAVs
* If load_vulkan_descriptor gets an index that didn't come from vulkan_resource_index, it is assumed to be an index into a descriptor heap
* Read-only SSBOs, as declared in the SPIR-V, are bound as raw buffer SRVs instead of UAVs, unless they're lowered to bindless
* No immediate constant buffer or scratch
*/
DXIL_ENVIRONMENT_VULKAN,