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/cast-to-half.shader_test

@@ -0,0 +1,32 @@
+[require]
+shader model >= 4.0
+
+[pixel shader]
+
+float4 main(uniform int i, uniform uint u, uniform bool b, uniform float f) : sv_target
+{
+    return float4(((half)i) + 1.5, ((half)u) - 2.5, ((half)b) / 2, f);
+}
+
+[test]
+uniform 0 int -1
+uniform 1 uint 3
+uniform 2 int -2
+uniform 3 float 0.5
+draw quad
+probe all rgba (0.5, 0.5, 0.5, 0.5)
+
+[pixel shader]
+
+float4 main() : sv_target
+{
+    int i = -1;
+    uint u = 3;
+    bool b = true;
+    float f = 0.5;
+    return float4(((half)i) + 1.5, ((half)u) - 2.5, ((half)b) / 2, f);
+}
+
+[test]
+draw quad
+probe all rgba (0.5, 0.5, 0.5, 0.5)