Rework Mesh handling on scene importing.

-Reworked how meshes are treated by importer by using EditorSceneImporterMesh and EditorSceneImporterMeshNode. Instead of Mesh and MeshInstance, this allows more efficient processing of meshes before they are actually registered in the RenderingServer.
-Integrated MeshOptimizer
-Reworked internals of SurfaceTool to use arrays, making it more performant and easy to run optimizatons on.

4 files changed, 121 insertions, 0 deletions

diff --git a/modules/meshoptimizer/SCsub b/modules/meshoptimizer/SCsub
new file mode 100644
index 0000000000..3b1a5f917e
--- /dev/null
+++ b/modules/meshoptimizer/SCsub
@@ -0,0 +1,34 @@
+#!/usr/bin/env python
+
+Import("env")
+Import("env_modules")
+
+env_meshoptimizer = env_modules.Clone()
+
+# Thirdparty source files
+thirdparty_dir = "#thirdparty/meshoptimizer/"
+thirdparty_sources = [
+    "allocator.cpp",
+    "clusterizer.cpp",
+    "indexcodec.cpp",
+    "indexgenerator.cpp",
+    "overdrawanalyzer.cpp",
+    "overdrawoptimizer.cpp",
+    "simplifier.cpp",
+    "spatialorder.cpp",
+    "stripifier.cpp",
+    "vcacheanalyzer.cpp",
+    "vcacheoptimizer.cpp",
+    "vertexcodec.cpp",
+    "vertexfilter.cpp",
+    "vfetchanalyzer.cpp",
+    "vfetchoptimizer.cpp",
+]
+thirdparty_sources = [thirdparty_dir + file for file in thirdparty_sources]
+
+
+env_thirdparty = env_meshoptimizer.Clone()
+env_thirdparty.disable_warnings()
+env_thirdparty.add_source_files(env.modules_sources, thirdparty_sources)
+
+env_modules.add_source_files(env.modules_sources, ["register_types.cpp"])
diff --git a/modules/meshoptimizer/config.py b/modules/meshoptimizer/config.py
new file mode 100644
index 0000000000..82e4e43397
--- /dev/null
+++ b/modules/meshoptimizer/config.py
@@ -0,0 +1,7 @@
+def can_build(env, platform):
+    # Having this on release by default, it's small and a lot of users like to do procedural stuff
+    return True
+
+
+def configure(env):
+    pass
diff --git a/modules/meshoptimizer/register_types.cpp b/modules/meshoptimizer/register_types.cpp
new file mode 100644
index 0000000000..26c8c6ab72
--- /dev/null
+++ b/modules/meshoptimizer/register_types.cpp
@@ -0,0 +1,43 @@
+/*************************************************************************/
+/*  register_types.cpp                                                   */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md).   */
+/*                                                                       */
+/* 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.                */
+/*************************************************************************/
+
+#include "register_types.h"
+#include "scene/resources/surface_tool.h"
+#include "thirdparty/meshoptimizer/meshoptimizer.h"
+
+void register_meshoptimizer_types() {
+	SurfaceTool::optimize_vertex_cache_func = meshopt_optimizeVertexCache;
+	SurfaceTool::simplify_func = meshopt_simplify;
+}
+
+void unregister_meshoptimizer_types() {
+	SurfaceTool::optimize_vertex_cache_func = nullptr;
+	SurfaceTool::simplify_func = nullptr;
+}
diff --git a/modules/meshoptimizer/register_types.h b/modules/meshoptimizer/register_types.h
new file mode 100644
index 0000000000..42b3a76a85
--- /dev/null
+++ b/modules/meshoptimizer/register_types.h
@@ -0,0 +1,37 @@
+/*************************************************************************/
+/*  register_types.h                                                     */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md).   */
+/*                                                                       */
+/* 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.                */
+/*************************************************************************/
+
+#ifndef MESHOPTIMIZER_REGISTER_TYPES_H
+#define MESHOPTIMIZER_REGISTER_TYPES_H
+
+void register_meshoptimizer_types();
+void unregister_meshoptimizer_types();
+
+#endif // PVR_REGISTER_TYPES_H