fix(Mesh): add mesh element data structure (#545)

Author: panquez

include/geode/basic/bitsery_archive.h

@@ -192,4 +192,4 @@ namespace bitsery
     struct PolymorphicClassName< Type >                                        \
     {                                                                          \
         static constexpr auto name = Name;                                     \
-    };
+    }

include/geode/mesh/core/mesh_element.h

@@ -0,0 +1,95 @@
+/*
+ * Copyright (c) 2019 - 2022 Geode-solutions
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ */
+
+#pragma once
+
+#include <geode/basic/uuid.h>
+
+#include <geode/mesh/common.h>
+
+namespace geode
+{
+    struct MeshElement
+    {
+        MeshElement( uuid mesh_id_in, index_t element_id_in )
+            : mesh_id( std::move( mesh_id_in ) ), element_id( element_id_in )
+        {
+        }
+
+        bool operator==( const MeshElement& other ) const
+        {
+            return mesh_id == other.mesh_id && element_id == other.element_id;
+        }
+
+        bool operator!=( const MeshElement& other ) const
+        {
+            return mesh_id != other.mesh_id || element_id != other.element_id;
+        }
+
+        template < typename Archive >
+        void serialize( Archive& archive )
+        {
+            archive.ext( *this, DefaultGrowable< Archive, MeshElement >{},
+                []( Archive& a, MeshElement& mesh_element ) {
+                    a.object( mesh_element.mesh_id );
+                    a.value4b( mesh_element.element_id );
+                } );
+        }
+
+        uuid mesh_id;
+        index_t element_id;
+
+    private:
+        friend class bitsery::Access;
+        MeshElement() = default;
+    };
+
+    struct MeshVertex : public MeshElement
+    {
+        using MeshElement::MeshElement;
+    };
+
+    struct MeshEdge : public MeshElement
+    {
+        using MeshElement::MeshElement;
+    };
+
+    struct MeshPolygon : public MeshElement
+    {
+        using MeshElement::MeshElement;
+    };
+} // namespace geode
+
+namespace std
+{
+    template <>
+    struct hash< geode::MeshElement >
+    {
+    public:
+        size_t operator()( const geode::MeshElement& mesh_element ) const
+        {
+            return absl::Hash< geode::uuid >()( mesh_element.mesh_id )
+                   ^ absl::Hash< geode::index_t >()( mesh_element.element_id );
+        }
+    };
+} // namespace std

src/geode/mesh/CMakeLists.txt

@@ -172,6 +172,7 @@ add_geode_library(
         "core/grid.h"
         "core/hybrid_solid.h"
         "core/mesh_factory.h"
+        "core/mesh_element.h"
         "core/mesh_id.h"
         "core/point_set.h"
         "core/polygonal_surface.h"

src/geode/mesh/core/bitsery_archive.cpp

@@ -40,6 +40,7 @@
 #include <geode/mesh/core/geode_tetrahedral_solid.h>
 #include <geode/mesh/core/geode_triangulated_surface.h>
 #include <geode/mesh/core/geode_vertex_set.h>
+#include <geode/mesh/core/mesh_element.h>
 #include <geode/mesh/core/private/solid_mesh_impl.h>
 #include <geode/mesh/core/private/surface_mesh_impl.h>
 
@@ -245,6 +246,9 @@ namespace
         geode::AttributeManager::register_attribute_type<
             geode::HybridSolid3D::Type, Serializer >(
             context, "HybridSolidType" );
+        geode::AttributeManager::register_attribute_type<
+            std::vector< geode::MeshElement >, Serializer >(
+            context, "MeshElement" );
         context.registerBasesList< Serializer >(
             bitsery::ext::PolymorphicClassesList< geode::VertexSet >{} );
     }