tests: Move HLSL tests to a subdirectory.

Approved-by: Giovanni Mascellani (@giomasce)
Approved-by: Francisco Casas (@fcasas)
Approved-by: Henri Verbeet (@hverbeet)
Approved-by: Alexandre Julliard (@julliard)
Merge-Request: https://gitlab.winehq.org/wine/vkd3d/-/merge_requests/248

tests/hlsl/round.shader_test

@@ -0,0 +1,40 @@
+[pixel shader]
+float4 main(uniform float4 u) : sv_target
+{
+    return round(u);
+}
+
+[test]
+uniform 0 float4 -0.4 -6.6 7.6 3.4
+draw quad
+probe all rgba (0.0, -7.0, 8.0, 3.0) 4
+
+
+
+[pixel shader]
+float4 main(uniform float4 u) : sv_target
+{
+    float a = round(u.r);
+    int2 b = round(u.gb);
+    float4 res = float4(b, a, u.a);
+    return round(res);
+}
+
+[test]
+uniform 0 float4 -0.4 -6.6 7.6 3.4
+draw quad
+probe all rgba (-7.0, 8.0, 0.0, 3.0) 4
+
+
+
+[pixel shader]
+float4 main(uniform float4 u) : sv_target
+{
+    int4 i = u;
+    return round(i);
+}
+
+[test]
+uniform 0 float4 -1 0 2 10
+draw quad
+probe all rgba (-1.0, 0.0, 2.0, 10.0) 4