Implement the ObjectToWorld HLSL Function

[farzonl]

• Implement ObjectToWorld clang builtin,
• Link ObjectToWorld clang builtin with hlsl_intrinsics.h
• Add sema checks for ObjectToWorld to CheckHLSLBuiltinFunctionCall in SemaChecking.cpp
• Add codegen for ObjectToWorld to EmitHLSLBuiltinExpr in CGBuiltin.cpp
• Add codegen tests to clang/test/CodeGenHLSL/builtins/ObjectToWorld.hlsl
• Add sema tests to clang/test/SemaHLSL/BuiltIns/ObjectToWorld-errors.hlsl
• Create the int_dx_ObjectToWorld intrinsic in IntrinsicsDirectX.td
• Create the DXILOpMapping of int_dx_ObjectToWorld to 151 in DXIL.td
• Create the ObjectToWorld.ll and ObjectToWorld_errors.ll tests in llvm/test/CodeGen/DirectX/

DirectX

DXIL Opcode	DXIL OpName	Shader Model	Shader Stages
151	ObjectToWorld	6.3	('library', 'intersection', 'anyhit', 'closesthit')

SPIR-V

There is no support for ObjectToWorld when targeting SPIR-V.

Test Case(s)

Example 1

//dxc ObjectToWorld_test.hlsl -T lib_6_8 -enable-16bit-types -O0

export float3x4 fn() {
    return ObjectToWorld();
}

HLSL:

Syntax

float<3@4> ObjectToWorld();

Type Description

Name	Template Type	Component Type	Size
ret	scalar	float	1

Minimum Shader Model

This function is supported in the following shader models.

Shader Model	Supported
Shader Model 6.3 and higher shader models	yes

Shader Stages

• Library Shader
• Intersection Shader
• Anyhit Shader
• Closesthit Shader

See also

• Intrinsic Functions (DirectX HLSL)
• See DXR Functional Spec