tests: Test shader compilation with default values.

Approved-by: Henri Verbeet (@hverbeet)
Merge-Request: https://gitlab.winehq.org/wine/vkd3d/-/merge_requests/1006

tests/hlsl/effect-compile.shader_test

@@ -183,6 +183,42 @@ float4 main() : sv_target
     return 0;
 }
 
+
+% Default values are allowed for uniform variables.
+[pixel shader todo fail(sm>=6)]
+float4 fun(uniform float4 a, uniform float4 b = {1, 2, 3, 4}) : sv_target
+{
+    return 8*a + b;
+}
+
+technique10 T1
+{
+    pass P1
+    {
+        PixelShader = compile ps_4_0 fun(5);
+    }
+}
+
+float4 main() : sv_target { return 0; }
+
+
+[pixel shader todo fail(sm>=6)]
+float4 fun(float4 a : COLOR0 = {-1, -2, -3, -4}, uniform float4 b = {1, 2, 3, 4}) : sv_target
+{
+    return 8*a + b;
+}
+
+technique10 T1
+{
+    pass P1
+    {
+        PixelShader = compile ps_4_0 fun();
+    }
+}
+
+float4 main() : sv_target { return 0; }
+
+
 [require]
 shader model >= 5.0
 shader model < 6.0