Implement shader caching

* Shader compilation is now cached. Subsequent loads take less than a millisecond.
* Improved game, editor and project manager startup time.
* Editor uses .godot/shader_cache to store shaders.
* Game uses user://shader_cache
* Project manager uses $config_dir/shader_cache
* Options to tweak shader caching in project settings.
* Editor path configuration moved from EditorSettings to new class, EditorPaths, so it can be available early on (before shaders are compiled).
* Reworked ShaderCompilerRD to ensure deterministic shader code creation (else shader may change and cache will be invalidated).
* Added shader compression with SMOLV: https://github.com/aras-p/smol-v

1 files changed, 72 insertions, 0 deletions

diff --git a/editor/editor_paths.h b/editor/editor_paths.h
new file mode 100644
index 0000000000..096174943d
--- /dev/null
+++ b/editor/editor_paths.h
@@ -0,0 +1,72 @@
+/*************************************************************************/
+/*  editor_paths.h                                                       */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2021 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 EDITORPATHS_H
+#define EDITORPATHS_H
+
+#include "core/config/engine.h"
+
+class EditorPaths : public Object {
+	GDCLASS(EditorPaths, Object)
+
+	bool paths_valid = false;
+	String settings_dir;
+	String data_dir; //editor data dir
+	String config_dir; //editor config dir
+	String cache_dir; //editor cache dir
+	bool self_contained = false; //true if running self contained
+	String self_contained_file; //self contained file with configuration
+
+	static EditorPaths *singleton;
+
+protected:
+	static void _bind_methods();
+
+public:
+	bool are_paths_valid() const;
+
+	String get_settings_dir() const;
+	String get_data_dir() const;
+	String get_config_dir() const;
+	String get_cache_dir() const;
+	bool is_self_contained() const;
+	String get_self_contained_file() const;
+
+	static EditorPaths *get_singleton() {
+		return singleton;
+	}
+
+	static void create(bool p_for_project_manager);
+	static void free();
+
+	EditorPaths(bool p_for_project_mamanger = false);
+};
+
+#endif // EDITORPATHS_H