================
@@ -148,6 +148,31 @@ template <typename T> constexpr T ldexp_impl(T X, T Exp) {
return exp2(Exp) * X;
}
+template <typename T> constexpr T fwidth_impl(T input) {
+#if (__has_builtin(__builtin_spirv_fwidth))
+ return __builtin_spirv_fwidth(input);
+#else
+ T derivCoarseX = __builtin_hlsl_elementwise_deriv_coarse_x(input);
+ derivCoarseX = abs(derivCoarseX);
+ T derivCoarseY = __builtin_hlsl_elementwise_deriv_coarse_y(input);
+ derivCoarseY = abs(derivCoarseY);
+ return derivCoarseX + derivCoarseY;
+#endif
+}
----------------
farzonl wrote:
I feel like fwidth_impl and `fwidth_vec_impl` could be merged into one function
see how we did refract:
https://github.com/llvm/llvm-project/commit/056f0a10b320fc2fd75f46aa67d68708303d89ad#diff-f5dc7c12e2bb511ab1504961855fdd1e81dbeda43b8e3ee174819fb4a61c4acb
https://github.com/llvm/llvm-project/pull/161378
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