From 1be819f4f0dbd001d1b222d7461a4fd87452dee2 Mon Sep 17 00:00:00 2001
From: Mehmet Oguz Derin <mehmetoguzderin@mehmetoguzderin.com>
Date: Thu, 26 Jun 2025 20:16:18 +0300
Subject: Support `mad` in WGSL (#7538)

---
 source/slang/hlsl.meta.slang | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

(limited to 'source')

diff --git a/source/slang/hlsl.meta.slang b/source/slang/hlsl.meta.slang
index 9800f2e65..32d7ea824 100644
--- a/source/slang/hlsl.meta.slang
+++ b/source/slang/hlsl.meta.slang
@@ -11157,7 +11157,7 @@ matrix<T,N,M> log2(matrix<T,N,M> x)
 /// @category math
 __generic<T : __BuiltinFloatingPointType>
 [__readNone]
-[require(cpp_cuda_glsl_hlsl_metal_spirv, shader5_sm_5_0)]
+[require(cpp_cuda_glsl_hlsl_metal_spirv_wgsl, shader5_sm_5_0)]
 T mad(T mvalue, T avalue, T bvalue)
 {
     __target_switch
@@ -11170,12 +11170,13 @@ T mad(T mvalue, T avalue, T bvalue)
     case spirv: return spirv_asm {
         OpExtInst $$T result glsl450 Fma $mvalue $avalue $bvalue
     };
+    case wgsl: __intrinsic_asm "fma";
     }
 }
 
 __generic<T : __BuiltinFloatingPointType, let N : int>
 [__readNone]
-[require(cpp_cuda_glsl_hlsl_metal_spirv, shader5_sm_5_0)]
+[require(cpp_cuda_glsl_hlsl_metal_spirv_wgsl, shader5_sm_5_0)]
 vector<T, N> mad(vector<T, N> mvalue, vector<T, N> avalue, vector<T, N> bvalue)
 {
     __target_switch
@@ -11186,6 +11187,7 @@ vector<T, N> mad(vector<T, N> mvalue, vector<T, N> avalue, vector<T, N> bvalue)
     case spirv: return spirv_asm {
         OpExtInst $$vector<T, N> result glsl450 Fma $mvalue $avalue $bvalue
     };
+    case wgsl: __intrinsic_asm "fma";
     default:
         VECTOR_MAP_TRINARY(T, N, mad, mvalue, avalue, bvalue);
     }
-- 
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