tests: Test entry point semantics on function declarations.

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/65

tests/entry-point-semantics.shader_test

@@ -0,0 +1,52 @@
+% Test how semantics are determined when spread across the entry point's
+% definition and its declarations.
+
+[vertex shader]
+void main(out float tex : texcoord, inout float4 pos : sv_position)
+{
+    tex = 0.2;
+}
+
+[pixel shader fail]
+
+float4 main(float tex : texcoord) : sv_target;
+
+float4 main(float tex)
+{
+    return tex;
+}
+
+[pixel shader fail]
+
+float4 main(float tex)
+{
+    return tex;
+}
+
+float4 main(float tex : texcoord) : sv_target;
+
+[pixel shader]
+
+float4 main(float tex : bogus) : bogus;
+
+float4 main(float tex : texcoord) : sv_target
+{
+    return tex;
+}
+
+[test]
+draw quad
+probe (0, 0) rgba (0.2, 0.2, 0.2, 0.2)
+
+[pixel shader]
+
+float4 main(float tex : texcoord) : sv_target
+{
+    return tex;
+}
+
+float4 main(float tex : bogus) : bogus;
+
+[test]
+draw quad
+probe (0, 0) rgba (0.2, 0.2, 0.2, 0.2)