implement dot products for 1 vectors (#8599)

Closes https://github.com/shader-slang/slang/issues/8378

1 files changed, 12 insertions, 0 deletions

diff --git a/source/slang/hlsl.meta.slang b/source/slang/hlsl.meta.slang
index 86e77c650..73bdee96e 100644
--- a/source/slang/hlsl.meta.slang
+++ b/source/slang/hlsl.meta.slang
@@ -8884,6 +8884,12 @@ __generic<T : __BuiltinFloatingPointType, let N : int>
 [require(cpp_cuda_glsl_hlsl_metal_spirv_wgsl, sm_4_0_version)]
 T dot(vector<T, N> x, vector<T, N> y)
 {
+    // Handle 1-vector case explicitly since many backends don't support it natively
+    if (N == 1)
+    {
+        return x[0] * y[0];
+    }
+    
     __target_switch
     {
     case glsl: __intrinsic_asm "dot";
@@ -8906,6 +8912,12 @@ __generic<T : __BuiltinIntegerType, let N : int>
 [require(cpp_cuda_glsl_hlsl_metal_spirv_wgsl, sm_4_0_version)]
 T dot(vector<T, N> x, vector<T, N> y)
 {
+    // Handle 1-vector case explicitly since many backends don't support it natively
+    if (N == 1)
+    {
+        return x[0] * y[0];
+    }
+    
     __target_switch
     {
     case hlsl: __intrinsic_asm "dot";