Cycles: Fix wrong render result in certain configuration of render layer's surface/hair

There were some synchronization missing in cases when only one of those settings
was disabled.

Also added a render test for such configurations now.

intern/cycles/blender/blender_mesh.cpp

@@ -621,7 +621,13 @@ Mesh *BlenderSync::sync_mesh(BL::Object b_ob, bool object_updated, bool hide_tri
 	}
 	
 	/* test if we need to sync */
-	bool use_mesh_geometry = render_layer.use_surfaces || render_layer.use_hair;
+	int requested_geometry_flags = Mesh::GEOMETRY_NONE;
+	if(render_layer.use_surfaces) {
+		requested_geometry_flags |= Mesh::GEOMETRY_TRIANGLES;
+	}
+	if(render_layer.use_hair) {
+		requested_geometry_flags |= Mesh::GEOMETRY_CURVES;
+	}
 	Mesh *mesh;
 
 	if(!mesh_map.sync(&mesh, key)) {
@@ -630,7 +636,7 @@ Mesh *BlenderSync::sync_mesh(BL::Object b_ob, bool object_updated, bool hide_tri
 		/* test if shaders changed, these can be object level so mesh
 		 * does not get tagged for recalc */
 		else if(mesh->used_shaders != used_shaders);
-		else if(use_mesh_geometry != mesh->geometry_synced);
+		else if(requested_geometry_flags != mesh->geometry_flags);
 		else {
 			/* even if not tagged for recalc, we may need to sync anyway
 			 * because the shader needs different mesh attributes */
@@ -664,7 +670,7 @@ Mesh *BlenderSync::sync_mesh(BL::Object b_ob, bool object_updated, bool hide_tri
 	mesh->used_shaders = used_shaders;
 	mesh->name = ustring(b_ob_data.name().c_str());
 
-	if(use_mesh_geometry) {
+	if(requested_geometry_flags != Mesh::GEOMETRY_NONE) {
 		/* mesh objects does have special handle in the dependency graph,
 		 * they're ensured to have properly updated.
 		 *
@@ -697,8 +703,8 @@ Mesh *BlenderSync::sync_mesh(BL::Object b_ob, bool object_updated, bool hide_tri
 			/* free derived mesh */
 			b_data.meshes.remove(b_mesh);
 		}
-		mesh->geometry_synced = true;
 	}
+	mesh->geometry_flags = requested_geometry_flags;
 
 	/* displacement method */
 	if(cmesh.data) {

intern/cycles/render/mesh.cpp

@@ -135,7 +135,7 @@ void Mesh::clear()
 	transform_applied = false;
 	transform_negative_scaled = false;
 	transform_normal = transform_identity();
-	geometry_synced = false;
+	geometry_flags = GEOMETRY_NONE;
 }
 
 int Mesh::split_vertex(int vertex)

intern/cycles/render/mesh.h

@@ -71,8 +71,13 @@ public:
 	ustring name;
 
 	/* Mesh Data */
-	bool geometry_synced;  /* used to distinguish meshes with no verts
-	                          and meshed for which geometry is not created */
+	enum GeometryFlags {
+		GEOMETRY_NONE      = 0,
+		GEOMETRY_TRIANGLES = (1 << 0),
+		GEOMETRY_CURVES    = (1 << 1),
+	};
+	int geometry_flags;  /* used to distinguish meshes with no verts
+	                        and meshed for which geometry is not created */
 
 	vector<float3> verts;
 	vector<Triangle> triangles;

tests/python/CMakeLists.txt

@@ -395,6 +395,12 @@ if(WITH_CYCLES)
 			-testdir "${TEST_SRC_DIR}/cycles/ctests/reports"
 			-idiff "${OPENIMAGEIO_IDIFF}"
 		)
+		add_test(cycles_render_test
+			${CMAKE_CURRENT_LIST_DIR}/cycles_render_tests.py
+			-blender "${TEST_BLENDER_EXE_BARE}"
+			-testdir "${TEST_SRC_DIR}/cycles/ctests/render"
+			-idiff "${OPENIMAGEIO_IDIFF}"
+		)
 		add_test(cycles_shaders_test
 			${CMAKE_CURRENT_LIST_DIR}/cycles_render_tests.py
 			-blender "${TEST_BLENDER_EXE_BARE}"