Implement the WorldToObject HLSL Function

[farzonl]

• Implement WorldToObject clang builtin,
• Link WorldToObject clang builtin with hlsl_intrinsics.h
• Add sema checks for WorldToObject to CheckHLSLBuiltinFunctionCall in SemaChecking.cpp
• Add codegen for WorldToObject to EmitHLSLBuiltinExpr in CGBuiltin.cpp
• Add codegen tests to clang/test/CodeGenHLSL/builtins/WorldToObject.hlsl
• Add sema tests to clang/test/SemaHLSL/BuiltIns/WorldToObject-errors.hlsl
• Create the int_dx_WorldToObject intrinsic in IntrinsicsDirectX.td
• Create the DXILOpMapping of int_dx_WorldToObject to 152 in DXIL.td
• Create the WorldToObject.ll and WorldToObject_errors.ll tests in llvm/test/CodeGen/DirectX/

DirectX

DXIL Opcode	DXIL OpName	Shader Model	Shader Stages
152	WorldToObject	6.3	('library', 'intersection', 'anyhit', 'closesthit')

SPIR-V

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

Test Case(s)

Example 1

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

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

HLSL:

Syntax

float<3@4> WorldToObject();

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