godot/editor/plugins/viewport_preview_editor_plugin.cpp

/*************************************************************************/
/*  viewport_preview_editor_plugin.cpp                                   */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
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#include "viewport_preview_editor_plugin.h"

bool EditorInspectorPluginViewportPreview::can_handle(Object *p_object) {
	return Object::cast_to<Viewport>(p_object) != nullptr;
}

void EditorInspectorPluginViewportPreview::parse_begin(Object *p_object) {
	Viewport *viewport = Object::cast_to<Viewport>(p_object);

	TexturePreview *viewport_preview = memnew(TexturePreview(viewport->get_texture(), false));
	viewport_preview->get_texture_display()->set_flip_v(true); // flip as ViewportTexture in 3.x is upside-down.

	// Otherwise `viewport_preview`'s `texture_display` doesn't update properly when `viewport`'s size changes.
	viewport->connect("size_changed", viewport_preview->get_texture_display(), "update");
	add_custom_control(viewport_preview);
}

ViewportPreviewEditorPlugin::ViewportPreviewEditorPlugin(EditorNode *p_node) {
	Ref<EditorInspectorPluginViewportPreview> plugin;
	plugin.instance();
	add_inspector_plugin(plugin);
}