Allow precomputeEdgeTable to return extra triangles

QTProject/subdivision.cpp

@@ -89,15 +89,18 @@ void Subdivision::subdivide(Mesh *mesh, int level) {
         Tables tables = precomputeTables(input);
         Result result = runShader(input, tables);
 
+        QVector<Triangle> triangles;
+        ibToTriangles(&result.vertex_buffer, tables.index_buffer, triangles);
         QVector<Triangle> all_triangles;
-        ibToTriangles(&result.vertex_buffer, tables.index_buffer, all_triangles);
+        ibToTriangles(&result.vertex_buffer, tables.extra_triangles, all_triangles);
+        all_triangles += triangles;
 
         QMap<Triangle, Triangle::Neighbors> neighbors;
         buildNeighborsMap(result.vertex_buffer, all_triangles, neighbors);
 
         QVector<Triangle> regular;
         QVector<Triangle> irregular;
-        findRegular(all_triangles, neighbors, regular, irregular);
+        findRegular(triangles, neighbors, regular, irregular);
 
         qCDebug(log_subdiv) << "Indices" << tables.index_buffer.length();
         qCDebug(log_subdiv) << "subdivide: regular" << regular.length();
@@ -177,6 +180,7 @@ Subdivision::Tables Subdivision::precomputeTables(Input input) {
 
     subTimer.restart();
     updateIndexBuffer(tables.index_buffer, modified_vertices);
+    updateIndexBuffer(tables.extra_triangles, modified_vertices);
     qCDebug(log_timing) << "updateIndexBuffer:" << formatTimeMeasurement(subTimer.elapsed());
 
     qCDebug(log_subdiv) << "Precompute Tables Done";

QTProject/subdivision.h

@@ -34,6 +34,7 @@ private:
         QVector<GLuint> vertex_offsets;
         QVector<GLuint> index_buffer;
         QVector<GLuint> patch_index_regular;
+        QVector<GLuint> extra_triangles;
     };
 
     struct Result