Exposed RenderingDevice to script API

Also added an easier way to load native GLSL shaders.

Extras:

Had to fix no-cache for subresources in resource loader, it was not properly working, making shaders not properly reload.

Note:

The precommit hooks are broken because they don't seem to support enums from one class being used in another.
Feel free to fix this after merging this PR.

editor/import/resource_importer_shader_file.cpp

@@ -0,0 +1,90 @@
+#include "resource_importer_shader_file.h"
+
+#include "core/io/marshalls.h"
+#include "core/io/resource_saver.h"
+#include "core/os/file_access.h"
+#include "editor/editor_node.h"
+#include "editor/plugins/shader_file_editor_plugin.h"
+#include "servers/rendering/rendering_device_binds.h"
+
+String ResourceImporterShaderFile::get_importer_name() const {
+
+	return "glsl";
+}
+
+String ResourceImporterShaderFile::get_visible_name() const {
+
+	return "GLSL Shader File";
+}
+void ResourceImporterShaderFile::get_recognized_extensions(List<String> *p_extensions) const {
+
+	p_extensions->push_back("glsl");
+}
+String ResourceImporterShaderFile::get_save_extension() const {
+	return "res";
+}
+
+String ResourceImporterShaderFile::get_resource_type() const {
+
+	return "RDShaderFile";
+}
+
+int ResourceImporterShaderFile::get_preset_count() const {
+	return 0;
+}
+String ResourceImporterShaderFile::get_preset_name(int p_idx) const {
+
+	return String();
+}
+
+void ResourceImporterShaderFile::get_import_options(List<ImportOption> *r_options, int p_preset) const {
+}
+
+bool ResourceImporterShaderFile::get_option_visibility(const String &p_option, const Map<StringName, Variant> &p_options) const {
+	return true;
+}
+static String _include_function(const String &p_path, void *userpointer) {
+	Error err;
+
+	String *base_path = (String *)userpointer;
+
+	String include = p_path;
+	if (include.is_rel_path()) {
+		include = base_path->plus_file(include);
+	}
+
+	FileAccessRef file_inc = FileAccess::open(include, FileAccess::READ, &err);
+	if (err != OK) {
+		return String();
+	}
+	return file_inc->get_as_utf8_string();
+}
+
+Error ResourceImporterShaderFile::import(const String &p_source_file, const String &p_save_path, const Map<StringName, Variant> &p_options, List<String> *r_platform_variants, List<String> *r_gen_files, Variant *r_metadata) {
+
+	/* STEP 1, Read shader code */
+
+	Error err;
+	FileAccessRef file = FileAccess::open(p_source_file, FileAccess::READ, &err);
+	ERR_FAIL_COND_V(err != OK, ERR_CANT_OPEN);
+	ERR_FAIL_COND_V(!file.operator->(), ERR_CANT_OPEN);
+
+	String file_txt = file->get_as_utf8_string();
+	Ref<RDShaderFile> shader_file;
+	shader_file.instance();
+	String base_path = p_source_file.get_base_dir();
+	err = shader_file->parse_versions_from_text(file_txt, _include_function, &base_path);
+
+	if (err != OK) {
+		if (!ShaderFileEditor::singleton->is_visible_in_tree()) {
+			EditorNode::get_singleton()->add_io_error(vformat(TTR("Error importing GLSL shader file: '%s'. Open the file in the filesystem dock in order to see the reason."), p_source_file));
+		}
+	}
+
+	ResourceSaver::save(p_save_path + ".res", shader_file);
+
+	return OK;
+}
+
+ResourceImporterShaderFile::ResourceImporterShaderFile() {
+}