tests/hlsl: Add a test for branching in a hull shader patch constant function.

Approved-by: Henri Verbeet (@hverbeet)
Merge-Request: https://gitlab.winehq.org/wine/vkd3d/-/merge_requests/1763

tests/hlsl/tessellation.shader_test

@@ -291,3 +291,85 @@ void main(patch_constant_data input,
 [test]
 if(!llvmpipe) todo(glsl | mvk & vulkan) draw 3 control point patch list 3
 if(!llvmpipe) todo(mvk) probe (0, 0, 640, 480) rgba(0.0, 1.0, 0.0, 1.0)
+
+[require]
+shader model >= 5.0
+tessellation-shader
+
+[hull shader]
+uniform uint foo;
+
+struct data
+{
+    float4 position : SV_Position;
+    float r : RED;
+    float g : GREEN;
+    float b : BLUE;
+};
+
+struct patch_constant_data
+{
+    float edges[3] : SV_TessFactor;
+    float inside : SV_InsideTessFactor;
+};
+
+void patch_constant(InputPatch<data, 3> input, out patch_constant_data output)
+{
+    if (foo)
+    {
+        output.edges[0] = output.edges[1] = output.edges[2] = 1.0f;
+        output.inside = 1.0f;
+    }
+    else
+    {
+        output.edges[0] = output.edges[1] = output.edges[2] = 3.0f;
+        output.inside = 2.0f;
+    }
+}
+
+    [domain("tri")]
+    [outputcontrolpoints(3)]
+    [partitioning("integer")]
+    [outputtopology("triangle_cw")]
+    [patchconstantfunc("patch_constant")]
+data main(InputPatch<data, 3> input, uint i : SV_OutputControlPointID)
+{
+    return input[i];
+}
+
+[domain shader]
+struct data
+{
+    float4 position : SV_Position;
+    float r : RED;
+    float g : GREEN;
+    float b : BLUE;
+};
+
+struct patch_constant_data
+{
+    float edges[3] : SV_TessFactor;
+    float inside : SV_InsideTessFactor;
+};
+
+    [domain("tri")]
+void main(patch_constant_data input,
+        float3 tess_coord : SV_DomainLocation,
+        const OutputPatch<data, 3> patch,
+        out data output)
+{
+    output.position = tess_coord.x * patch[0].position
+            + tess_coord.y * patch[1].position
+            + tess_coord.z * patch[2].position;
+    output.r = input.edges[0] / 4.0f;
+    output.g = input.inside / 4.0f;
+    output.b = tess_coord.x * patch[0].b + tess_coord.y * patch[1].b + tess_coord.z * patch[2].b;
+}
+
+[test]
+uniform 0 uint 0
+if(!llvmpipe) todo(glsl | mvk & vulkan | sm>=6) draw 3 control point patch list 3
+if(!llvmpipe) todo(mvk) probe (0, 0, 640, 480) f32(0.75, 0.5, 0.0, 1.0)
+uniform 0 uint 1
+if(!llvmpipe) todo(glsl | mvk & vulkan | sm>=6) draw 3 control point patch list 3
+if(!llvmpipe) todo(mvk) probe (0, 0, 640, 480) f32(0.25, 0.25, 0.0, 1.0)