From 8e90098419e924980e7d92c28d7c87148b4821a5 Mon Sep 17 00:00:00 2001 From: kaizhangNV <149626564+kaizhangNV@users.noreply.github.com> Date: Thu, 11 Jan 2024 12:10:43 -0800 Subject: Support for gl_HitTriangleVertexPositionsEXT (#3405) (#3442) * Support for gl_HitTriangleVertexPositionsEXT (#3405) Adding float3 HitTriangleVertexPositions(uint) to slang stdlib to support GLSL gl_HitTriangleVertexPositionsEXT builtin variable under extension of GL_EXT_ray_tracing_position_fetch. This function support emitting GLSL code and spir-V directly. * Update the function name --------- Co-authored-by: Yong He --- source/slang/hlsl.meta.slang | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) (limited to 'source') diff --git a/source/slang/hlsl.meta.slang b/source/slang/hlsl.meta.slang index 144141b79..2f4064c97 100644 --- a/source/slang/hlsl.meta.slang +++ b/source/slang/hlsl.meta.slang @@ -9861,6 +9861,31 @@ uint GeometryIndex() } } +// Get the vertex positions of the currently hit triangle in any-hit or closest-hit shader. +// https://github.com/KhronosGroup/GLSL/blob/master/extensions/ext/GLSL_EXT_ray_tracing_position_fetch.txt +__glsl_extension(GL_EXT_ray_tracing) +__glsl_extension(GL_EXT_ray_tracing_position_fetch) +__glsl_version(460) +[ForceInline] +float3 HitTriangleVertexPosition(uint index) +{ + __target_switch + { + case glsl: + __intrinsic_asm "gl_HitTriangleVertexPositionsEXT[$0]"; + case spirv: + return spirv_asm { + OpCapability RayTracingKHR; + OpCapability RayTracingPositionFetchKHR; + OpExtension "SPV_KHR_ray_tracing"; + OpExtension "SPV_KHR_ray_tracing_position_fetch"; + %_ptr_Input_v3float = OpTypePointer Input $$float3; + %addr : %_ptr_Input_v3float = OpAccessChain builtin(HitTriangleVertexPositionsKHR:float3[3]) $index; + result:$$float3 = OpLoad %addr; + }; + } +} + // Status of whether a (closest) hit has been committed in a `RayQuery`. typedef uint COMMITTED_STATUS; -- cgit v1.2.3