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/lerp.shader_test

@@ -0,0 +1,64 @@
+[pixel shader]
+uniform float4 x;
+uniform float4 y;
+uniform float4 s;
+
+float4 main() : SV_TARGET
+{
+    return lerp(x, y, s);
+}
+
+[test]
+uniform 0 float4 2.0 3.0 4.0 5.0
+uniform 4 float4 0.0 -10.0 10.0 100.0
+uniform 8 float4 0.0 1.0 -1.0 0.75
+draw quad
+probe all rgba (2.0, -10.0, -2.0, 76.25)
+
+[require]
+shader model >= 4.0
+
+[pixel shader]
+uniform int4 x;
+uniform int4 y;
+uniform int4 s;
+
+float4 main() : SV_TARGET
+{
+    return lerp(x, y, s);
+}
+
+[test]
+uniform 0 int4 2 3 4 0
+uniform 4 int4 0 -10 10 1000000
+uniform 8 int4 0 1 -1 1000000
+draw quad
+probe all rgba (2.0, -10.0, -2.0, 1e12)
+
+
+[pixel shader]
+float4 main() : sv_target
+{
+    float3x2 a = {6, 5, 4, 3, 2, 1};
+    float2x3 b = {1, 2, 3, 4.2, 5.2, 6.2};
+    float3x4 c = 2.4;
+
+    float2x2 r = lerp(a, b, c);
+    return float4(r);
+}
+
+[test]
+draw quad
+probe all rgba (-6.0, -2.2, 4.48, 8.28) 1
+
+
+[pixel shader fail]
+float4 main() : sv_target
+{
+    float2x2 a = {0, 1, 2, 3};
+    float2x2 b = {1, 2, 3, 4};
+    float4 c = {0.5, 0.5, 0.5, 0.5};
+
+    lerp(a, b, c);
+    return 0;
+}