vkd3d-shader/hlsl: Prefer overload candidates without component count widening.

Approved-by: Francisco Casas (@fcasas)
Approved-by: Henri Verbeet (@hverbeet)
Merge-Request: https://gitlab.winehq.org/wine/vkd3d/-/merge_requests/1313

libs/vkd3d-shader/hlsl.y

@@ -3088,7 +3088,9 @@ static int function_parameter_compare(const struct hlsl_ir_var *candidate,
     if ((ret = (a.width > r.width) - (a.width > c.width)))
         return ret;
 
-    return 0;
+    /* Prefer candidates without component count widening. E.g. given a float
+     * argument, float is a better match than float2. */
+    return (a.count < r.count) - (a.count < c.count);
 }
 
 static int function_compare(const struct hlsl_ir_function_decl *candidate,

tests/hlsl/function-overload.shader_test

@@ -184,7 +184,7 @@ float4 main() : sv_target
 }
 
 % An exact match is preferred over widening.
-[pixel shader todo]
+[pixel shader]
 float f(float x) { return 1.0; }
 float f(float2 x) { return 2.0; }
 
@@ -194,7 +194,7 @@ float4 main() : sv_target
 }
 
 [test]
-todo(sm<6) draw quad
+draw quad
 probe (0, 0) rgba(1.0, 1.0, 1.0, 1.0)
 
 % Component type narrowing is preferred over component count narrowing.