https://github.com/Icohedron created
https://github.com/llvm/llvm-project/pull/122202
Fixes #99092.
1. Defines the function `D3DCOLORtoUBYTE4` in
`clang/lib/Headers/hlsl/hlsl_intrinsics.h`.
2. Implements the function `D3DCOLORtoUBYTE4` as `d3d_color_to_ubyte4` in
`clang/lib/Headers/hlsl/hlsl_detail.h`
3. Adds a HLSL codegen test to
`clang/test/CodeGenHLSL/builtins/D3DCOLORtoUBYTE4.hlsl`
4. Adds error tests to
`clang/test/SemaHLSL/BuiltIns/D3DCOLORtoUBYTE4-errors.hlsl`
>From 0ef5e0217c04aa16c2f54b5f0edf0a6dc4cdc28d Mon Sep 17 00:00:00 2001
From: Icohedron <cheung.de...@gmail.com>
Date: Thu, 9 Jan 2025 01:14:52 +0000
Subject: [PATCH] Implement D3DCOLORtoUBYTE4 intrinsic
---
clang/lib/Headers/hlsl/hlsl_detail.h | 8 ++++++++
clang/lib/Headers/hlsl/hlsl_intrinsics.h | 17 +++++++++++++++++
.../CodeGenHLSL/builtins/D3DCOLORtoUBYTE4.hlsl | 12 ++++++++++++
.../BuiltIns/D3DCOLORtoUBYTE4-errors.hlsl | 13 +++++++++++++
4 files changed, 50 insertions(+)
create mode 100644 clang/test/CodeGenHLSL/builtins/D3DCOLORtoUBYTE4.hlsl
create mode 100644 clang/test/SemaHLSL/BuiltIns/D3DCOLORtoUBYTE4-errors.hlsl
diff --git a/clang/lib/Headers/hlsl/hlsl_detail.h
b/clang/lib/Headers/hlsl/hlsl_detail.h
index 8d5fd941331531..470fa4214a12f8 100644
--- a/clang/lib/Headers/hlsl/hlsl_detail.h
+++ b/clang/lib/Headers/hlsl/hlsl_detail.h
@@ -33,6 +33,14 @@ constexpr enable_if_t<sizeof(U) == sizeof(T), U> bit_cast(T
F) {
return __builtin_bit_cast(U, F);
}
+constexpr vector<uint, 4> d3d_color_to_ubyte4(vector<float, 4> V) {
+ // Use the same scaling factor used by FXC (i.e., 255.001953)
+ // Excerpt from stackoverflow discussion:
+ // "Built-in rounding, necessary because of truncation. 0.001953 * 256 = 0.5"
+ //
https://stackoverflow.com/questions/52103720/why-does-d3dcolortoubyte4-multiplies-components-by-255-001953f
+ return V.zyxw * 255.001953f;
+}
+
} // namespace __detail
} // namespace hlsl
#endif //_HLSL_HLSL_DETAILS_H_
diff --git a/clang/lib/Headers/hlsl/hlsl_intrinsics.h
b/clang/lib/Headers/hlsl/hlsl_intrinsics.h
index b745997f1d5a2b..e44403c6c802e0 100644
--- a/clang/lib/Headers/hlsl/hlsl_intrinsics.h
+++ b/clang/lib/Headers/hlsl/hlsl_intrinsics.h
@@ -1857,6 +1857,23 @@ half3 cross(half3, half3);
_HLSL_BUILTIN_ALIAS(__builtin_hlsl_cross)
float3 cross(float3, float3);
+//===----------------------------------------------------------------------===//
+// D3DCOLORtoUBYTE4 builtins
+//===----------------------------------------------------------------------===//
+
+/// \fn T D3DCOLORtoUBYTE4(T x)
+/// \brief Converts a floating-point, 4D vector set by a D3DCOLOR to a UBYTE4.
+/// \param x [in] The floating-point vector4 to convert.
+///
+/// The return value is the UBYTE4 representation of the \a x parameter.
+///
+/// This function swizzles and scales components of the \a x parameter. Use
this
+/// function to compensate for the lack of UBYTE4 support in some hardware.
+
+constexpr vector<uint, 4> D3DCOLORtoUBYTE4(vector<float, 4> V) {
+ return __detail::d3d_color_to_ubyte4(V);
+}
+
//===----------------------------------------------------------------------===//
// rcp builtins
//===----------------------------------------------------------------------===//
diff --git a/clang/test/CodeGenHLSL/builtins/D3DCOLORtoUBYTE4.hlsl
b/clang/test/CodeGenHLSL/builtins/D3DCOLORtoUBYTE4.hlsl
new file mode 100644
index 00000000000000..6e48800dae6698
--- /dev/null
+++ b/clang/test/CodeGenHLSL/builtins/D3DCOLORtoUBYTE4.hlsl
@@ -0,0 +1,12 @@
+// RUN: %clang_cc1 -finclude-default-header -triple \
+// RUN: dxil-pc-shadermodel6.3-library %s -fnative-half-type \
+// RUN: -emit-llvm -O1 -o - | FileCheck %s --check-prefixes=CHECK
+
+// CHECK-LABEL: D3DCOLORtoUBYTE4
+int4 test_D3DCOLORtoUBYTE4 ( float4 p1 ) {
+ // CHECK: %[[SCALED:.*]] = fmul <4 x float> %{{.*}}, splat (float
0x406FE01000000000)
+ // CHECK: %[[CONVERTED:.*]] = fptoui <4 x float> %[[SCALED]] to <4 x i32>
+ // CHECK: %[[SHUFFLED:.*]] = shufflevector <4 x i32> %{{.*}}, <4 x i32>
poison, <4 x i32> <i32 2, i32 1, i32 0, i32 3>
+ // CHECK: ret <4 x i32> %[[SHUFFLED]]
+ return D3DCOLORtoUBYTE4 ( p1 );
+}
diff --git a/clang/test/SemaHLSL/BuiltIns/D3DCOLORtoUBYTE4-errors.hlsl
b/clang/test/SemaHLSL/BuiltIns/D3DCOLORtoUBYTE4-errors.hlsl
new file mode 100644
index 00000000000000..fb41c212bd0be3
--- /dev/null
+++ b/clang/test/SemaHLSL/BuiltIns/D3DCOLORtoUBYTE4-errors.hlsl
@@ -0,0 +1,13 @@
+// RUN: %clang_cc1 -finclude-default-header -triple
dxil-pc-shadermodel6.6-library %s -emit-llvm-only -disable-llvm-passes -verify
+
+int4 test_too_few_arg() {
+ return D3DCOLORtoUBYTE4();
+ // expected-error@-1 {{no matching function for call to 'D3DCOLORtoUBYTE4'}}
+ // expected-note@hlsl/hlsl_intrinsics.h:* {{candidate function not viable:
requires single argument 'V', but no arguments were provided}}
+}
+
+int4 test_too_many_arg(float4 v) {
+ return D3DCOLORtoUBYTE4(v, v);
+ // expected-error@-1 {{no matching function for call to 'D3DCOLORtoUBYTE4'}}
+ // expected-note@hlsl/hlsl_intrinsics.h:* {{candidate function not viable:
requires single argument 'V', but 2 arguments were provided}}
+}
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