tests: Test step() intrinsic.

Approved-by: Giovanni Mascellani (@giomasce)
Approved-by: Zebediah Figura (@zfigura)
Approved-by: Henri Verbeet (@hverbeet)
Approved-by: Alexandre Julliard (@julliard)
Merge-Request: https://gitlab.winehq.org/wine/vkd3d/-/merge_requests/62

Makefile.am

@@ -132,6 +132,7 @@ vkd3d_shader_tests = \
 	tests/saturate.shader_test \
 	tests/shader-interstage-interface.shader_test \
 	tests/sqrt.shader_test \
+	tests/step.shader_test \
 	tests/swizzle-0.shader_test \
 	tests/swizzle-1.shader_test \
 	tests/swizzle-2.shader_test \

tests/step.shader_test

@@ -0,0 +1,55 @@
+[pixel shader todo]
+uniform float4 f, p;
+
+float4 main() : sv_target
+{
+    return step(f, p);
+}
+
+[test]
+uniform 0 float4 5.0 -2.6 3.0 2.0
+uniform 4 float4 1.0 -4.3 3.0 4.0
+todo draw quad
+todo probe all rgba (0.0, 0.0, 1.0, 1.0)
+
+
+[pixel shader todo]
+float4 main() : sv_target
+{
+    float2x2 a = {1, 2, 3, 4};
+    float b = {3};
+
+    return float4(step(a, b));
+}
+
+[test]
+todo draw quad
+todo probe all rgba (1.0, 1.0, 1.0, 0.0)
+
+
+[pixel shader fail]
+float4 main() : sv_target
+{
+    float2x2 a = {1, 2, 3, 4};
+    float1 b = {3};
+
+    step(a, b);
+    return 0;
+}
+
+
+[pixel shader todo]
+float4 main() : sv_target
+{
+    float3x2 a = {8, 0,
+                  0, 8,
+                  8, 8};
+    float2x3 b = {0, 8, 0,
+                  8, 0, 0};
+
+    return float4(step(a, b));
+}
+
+[test]
+todo draw quad
+todo probe all rgba (0.0, 1.0, 1.0, 0.0)