OpenSubdiv: Add regression tests for mesh topology

While this looks trivial it already allowed to catch issues in one
of previous attempt to optimize memory usage. It will totally be
useful for an upcoming refactor of face topology storage.

intern/opensubdiv/CMakeLists.txt

@@ -119,3 +119,15 @@ else()
 endif()
 
 blender_add_lib(bf_intern_opensubdiv "${SRC}" "${INC}" "${INC_SYS}" "${LIB}")
+
+# Tests.
+
+if(WITH_GTESTS AND WITH_OPENSUBDIV)
+  include(GTestTesting)
+
+  add_definitions(${GFLAGS_DEFINES})
+  add_definitions(${GLOG_DEFINES})
+  add_definitions(-DBLENDER_GFLAGS_NAMESPACE=${GFLAGS_NAMESPACE})
+
+  BLENDER_SRC_GTEST(opensubdiv_mesh_topology_test "internal/topology/mesh_topology_test.cc" "${LIB};bf_intern_opensubdiv")
+endif()

intern/opensubdiv/internal/topology/mesh_topology.cc

@@ -138,6 +138,7 @@ void MeshTopology::setEdgeSharpness(int edge_index, float sharpness)
 
   Edge &edge = edges_[edge_index];
   assert(edge.isValid());
+  (void)edge;
 
   if (sharpness < 1e-6f) {
     return;

intern/opensubdiv/internal/topology/mesh_topology_test.cc

@@ -0,0 +1,95 @@
+// Copyright 2020 Blender Foundation. All rights reserved.
+//
+// This program is free software; you can redistribute it and/or
+// modify it under the terms of the GNU General Public License
+// as published by the Free Software Foundation; either version 2
+// of the License, or (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software Foundation,
+// Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+//
+// Author: Sergey Sharybin
+
+#include "internal/topology/mesh_topology.h"
+#include "testing/testing.h"
+
+namespace blender {
+namespace opensubdiv {
+
+TEST(MeshTopology, TrivialVertexSharpness)
+{
+  MeshTopology mesh_topology;
+
+  mesh_topology.setNumVertices(3);
+
+  mesh_topology.setVertexSharpness(0, 0.1f);
+  mesh_topology.setVertexSharpness(1, 0.2f);
+
+  EXPECT_EQ(mesh_topology.getVertexSharpness(0), 0.1f);
+  EXPECT_EQ(mesh_topology.getVertexSharpness(1), 0.2f);
+  EXPECT_EQ(mesh_topology.getVertexSharpness(2), 0.0f);
+}
+
+TEST(MeshTopology, TrivialEdgeSharpness)
+{
+  MeshTopology mesh_topology;
+
+  mesh_topology.setNumVertices(8);
+  mesh_topology.setNumEdges(3);
+
+  mesh_topology.setEdgeVertexIndices(0, 0, 1);
+  mesh_topology.setEdgeVertexIndices(1, 1, 2);
+  mesh_topology.setEdgeVertexIndices(2, 2, 3);
+
+  mesh_topology.setEdgeSharpness(0, 0.1f);
+  mesh_topology.setEdgeSharpness(2, 0.2f);
+
+  EXPECT_EQ(mesh_topology.getEdgeSharpness(0), 0.1f);
+  EXPECT_EQ(mesh_topology.getEdgeSharpness(1), 0.0f);
+  EXPECT_EQ(mesh_topology.getEdgeSharpness(2), 0.2f);
+}
+
+TEST(MeshTopology, TrivialFaceTopology)
+{
+  MeshTopology mesh_topology;
+
+  mesh_topology.setNumFaces(3);
+
+  {
+    mesh_topology.setNumFaceVertices(0, 4);
+    int vertex_indices[] = {0, 1, 2, 3};
+    mesh_topology.setFaceVertexIndices(0, vertex_indices);
+  }
+
+  {
+    mesh_topology.setNumFaceVertices(1, 3);
+    int vertex_indices[] = {4, 5, 6};
+    mesh_topology.setFaceVertexIndices(1, vertex_indices);
+  }
+
+  {
+    mesh_topology.setNumFaceVertices(2, 5);
+    int vertex_indices[] = {7, 8, 9, 10, 11};
+    mesh_topology.setFaceVertexIndices(2, vertex_indices);
+  }
+
+  EXPECT_EQ(mesh_topology.getNumFaceVertices(0), 4);
+  EXPECT_EQ(mesh_topology.getNumFaceVertices(1), 3);
+  EXPECT_EQ(mesh_topology.getNumFaceVertices(2), 5);
+
+  EXPECT_TRUE(mesh_topology.isFaceVertexIndicesEqual(0, {{0, 1, 2, 3}}));
+  EXPECT_FALSE(mesh_topology.isFaceVertexIndicesEqual(0, {{10, 1, 2, 3}}));
+  EXPECT_FALSE(mesh_topology.isFaceVertexIndicesEqual(0, {{0, 1, 2}}));
+
+  EXPECT_TRUE(mesh_topology.isFaceVertexIndicesEqual(1, {{4, 5, 6}}));
+  EXPECT_TRUE(mesh_topology.isFaceVertexIndicesEqual(2, {{7, 8, 9, 10, 11}}));
+}
+
+}  // namespace opensubdiv
+}  // namespace blender