text: /*************************************************************************/
  /*  visual_server_raster.cpp                                             */
  /*************************************************************************/
  /*                       This file is part of:                           */
  /*                           GODOT ENGINE                                */
  /*                      https://godotengine.org                          */
  /*************************************************************************/
  /* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur.                 */
  /* Copyright (c) 2014-2019 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  */
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  /* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
  /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
  /*************************************************************************/
  
  #include "visual_server_raster.h"
  
  #include "core/io/marshalls.h"
  #include "core/os/os.h"
  #include "core/project_settings.h"
  #include "core/sort_array.h"
  #include "visual_server_canvas.h"
  #include "visual_server_globals.h"
  #include "visual_server_scene.h"
  
  // careful, these may run in different threads than the visual server
  
  int VisualServerRaster::changes = 0;
  
  /* BLACK BARS */
  
  void VisualServerRaster::black_bars_set_margins(int p_left, int p_top, int p_right, int p_bottom) {
  
  	black_margin[MARGIN_LEFT] = p_left;
  	black_margin[MARGIN_TOP] = p_top;
  	black_margin[MARGIN_RIGHT] = p_right;
  	black_margin[MARGIN_BOTTOM] = p_bottom;
  }
  
  void VisualServerRaster::black_bars_set_images(RID p_left, RID p_top, RID p_right, RID p_bottom) {
  
  	black_image[MARGIN_LEFT] = p_left;
  	black_image[MARGIN_TOP] = p_top;
  	black_image[MARGIN_RIGHT] = p_right;
  	black_image[MARGIN_BOTTOM] = p_bottom;
  }
  
  void VisualServerRaster::_draw_margins() {
  
  	VSG::canvas_render->draw_window_margins(black_margin, black_image);
  };
  
  /* FREE */
  
  void VisualServerRaster::free(RID p_rid) {
  
  	if (VSG::storage->free(p_rid))
  		return;
  	if (VSG::canvas->free(p_rid))
  		return;
  	if (VSG::viewport->free(p_rid))
  		return;
  	if (VSG::scene->free(p_rid))
  		return;
  }
  
  /* EVENT QUEUING */
  
  void VisualServerRaster::request_frame_drawn_callback(Object *p_where, const StringName &p_method, const Variant &p_userdata) {
  
  	ERR_FAIL_NULL(p_where);
  	FrameDrawnCallbacks fdc;
  	fdc.object = p_where->get_instance_id();
  	fdc.method = p_method;
  	fdc.param = p_userdata;
  
  	frame_drawn_callbacks.push_back(fdc);
  }
  
  void VisualServerRaster::draw(bool p_swap_buffers, double frame_step) {
  
  	//needs to be done before changes is reset to 0, to not force the editor to redraw
  	VS::get_singleton()->emit_signal("frame_pre_draw");
  
  	changes = 0;
  
  	VSG::rasterizer->begin_frame(frame_step);
  
  	VSG::scene->update_dirty_instances(); //update scene stuff
  
  	VSG::viewport->draw_viewports();
  	VSG::scene->render_probes();
  	_draw_margins();
  	VSG::rasterizer->end_frame(p_swap_buffers);
  
  	while (frame_drawn_callbacks.front()) {
  
  		Object *obj = ObjectDB::get_instance(frame_drawn_callbacks.front()->get().object);
  		if (obj) {
  			Variant::CallError ce;
  			const Variant *v = &frame_drawn_callbacks.front()->get().param;
  			obj->call(frame_drawn_callbacks.front()->get().method, &v, 1, ce);
  			if (ce.error != Variant::CallError::CALL_OK) {
  				String err = Variant::get_call_error_text(obj, frame_drawn_callbacks.front()->get().method, &v, 1, ce);
  				ERR_PRINTS("Error calling frame drawn function: " + err);
  			}
  		}
  
  		frame_drawn_callbacks.pop_front();
  	}
  	VS::get_singleton()->emit_signal("frame_post_draw");
  }
  void VisualServerRaster::sync() {
  }
  bool VisualServerRaster::has_changed() const {
  
  	return changes > 0;
  }
  void VisualServerRaster::init() {
  
  	VSG::rasterizer->initialize();
  }
  void VisualServerRaster::finish() {
  
  	if (test_cube.is_valid()) {
  		free(test_cube);
  	}
  
  	VSG::rasterizer->finalize();
  }
  
  /* STATUS INFORMATION */
  
  int VisualServerRaster::get_render_info(RenderInfo p_info) {
  
  	return VSG::storage->get_render_info(p_info);
  }
  
  /* TESTING */
  
  void VisualServerRaster::set_boot_image(const Ref<Image> &p_image, const Color &p_color, bool p_scale, bool p_use_filter) {
  
  	redraw_request();
  	VSG::rasterizer->set_boot_image(p_image, p_color, p_scale, p_use_filter);
  }
  void VisualServerRaster::set_default_clear_color(const Color &p_color) {
  	VSG::viewport->set_default_clear_color(p_color);
  }
  
  bool VisualServerRaster::has_feature(Features p_feature) const {
  
  	return false;
  }
  
  RID VisualServerRaster::get_test_cube() {
  	if (!test_cube.is_valid()) {
  		test_cube = _make_test_cube();
  	}
  	return test_cube;
  }
  
  bool VisualServerRaster::has_os_feature(const String &p_feature) const {
  
  	return VSG::storage->has_os_feature(p_feature);
  }
  
  void VisualServerRaster::set_debug_generate_wireframes(bool p_generate) {
  
  	VSG::storage->set_debug_generate_wireframes(p_generate);
  }
  
  void VisualServerRaster::call_set_use_vsync(bool p_enable) {
  	OS::get_singleton()->_set_use_vsync(p_enable);
  }
  
  bool VisualServerRaster::is_low_end() const {
  	return VSG::rasterizer->is_low_end();
  }
  VisualServerRaster::VisualServerRaster() {
  
  	VSG::canvas = memnew(VisualServerCanvas);
  	VSG::viewport = memnew(VisualServerViewport);
  	VSG::scene = memnew(VisualServerScene);
  	VSG::rasterizer = Rasterizer::create();
  	VSG::storage = VSG::rasterizer->get_storage();
  	VSG::canvas_render = VSG::rasterizer->get_canvas();
  	VSG::scene_render = VSG::rasterizer->get_scene();
  
  	for (int i = 0; i < 4; i++) {
  		black_margin[i] = 0;
  		black_image[i] = RID();
  	}
  }
  
  VisualServerRaster::~VisualServerRaster() {
  
  	memdelete(VSG::canvas);
  	memdelete(VSG::viewport);
  	memdelete(VSG::rasterizer);
  	memdelete(VSG::scene);
  }
  