/*************************************************************************/
/*  renderer_viewport.cpp                                                */
/*************************************************************************/
/*                       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).   */
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/* 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   */
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/* distribute, sublicense, and/or sell copies of the Software, and to    */
/* permit persons to whom the Software is furnished to do so, subject to */
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/* 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,       */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/*************************************************************************/

#include "renderer_viewport.h"

#include "core/config/project_settings.h"
#include "renderer_canvas_cull.h"
#include "renderer_scene_cull.h"
#include "rendering_server_globals.h"

static Transform2D _canvas_get_transform(RendererViewport::Viewport *p_viewport, RendererCanvasCull::Canvas *p_canvas, RendererViewport::Viewport::CanvasData *p_canvas_data, const Vector2 &p_vp_size) {
	Transform2D xf = p_viewport->global_transform;

	float scale = 1.0;
	if (p_viewport->canvas_map.has(p_canvas->parent)) {
		Transform2D c_xform = p_viewport->canvas_map[p_canvas->parent].transform;
		if (p_viewport->snap_2d_transforms_to_pixel) {
			c_xform.elements[2] = c_xform.elements[2].floor();
		}
		xf = xf * c_xform;
		scale = p_canvas->parent_scale;
	}

	Transform2D c_xform = p_canvas_data->transform;

	if (p_viewport->snap_2d_transforms_to_pixel) {
		c_xform.elements[2] = c_xform.elements[2].floor();
	}

	xf = xf * c_xform;

	if (scale != 1.0 && !RSG::canvas->disable_scale) {
		Vector2 pivot = p_vp_size * 0.5;
		Transform2D xfpivot;
		xfpivot.set_origin(pivot);
		Transform2D xfscale;
		xfscale.scale(Vector2(scale, scale));

		xf = xfpivot.affine_inverse() * xf;
		xf = xfscale * xf;
		xf = xfpivot * xf;
	}

	return xf;
}

void RendererViewport::_configure_3d_render_buffers(Viewport *p_viewport) {
	if (p_viewport->render_buffers.is_valid()) {
		if (p_viewport->size.width == 0 || p_viewport->size.height == 0) {
			RSG::scene->free(p_viewport->render_buffers);
			p_viewport->render_buffers = RID();
		} else {
			float scale_3d = p_viewport->scale_3d;
			if (Engine::get_singleton()->is_editor_hint()) {
				// Ignore the 3D viewport render scaling inside of the editor.
				// The Half Resolution 3D editor viewport option should be used instead.
				scale_3d = 1.0;
			}

			// Clamp 3D rendering resolution to reasonable values supported on most hardware.
			// This prevents freezing the engine or outright crashing on lower-end GPUs.
			const int width = CLAMP(p_viewport->size.width * scale_3d, 1, 16384);
			const int height = CLAMP(p_viewport->size.height * scale_3d, 1, 16384);
			RSG::scene->render_buffers_configure(p_viewport->render_buffers, p_viewport->render_target, width, height, p_viewport->msaa, p_viewport->screen_space_aa, p_viewport->use_debanding, p_viewport->get_view_count());
		}
	}
}

void RendererViewport::_draw_3d(Viewport *p_viewport) {
	RENDER_TIMESTAMP(">Begin Rendering 3D Scene");

	Ref<XRInterface> xr_interface;
	if (p_viewport->use_xr && XRServer::get_singleton() != nullptr) {
		xr_interface = XRServer::get_singleton()->get_primary_interface();
	}

	if (p_viewport->use_occlusion_culling) {
		if (p_viewport->occlusion_buffer_dirty) {
			float aspect = p_viewport->size.aspect();
			int max_size = occlusion_rays_per_thread * RendererThreadPool::singleton->thread_work_pool.get_thread_count();

			int viewport_size = p_viewport->size.width * p_viewport->size.height;
			max_size = CLAMP(max_size, viewport_size / (32 * 32), viewport_size / (2 * 2)); // At least one depth pixel for every 16x16 region. At most one depth pixel for every 2x2 region.

			float height = Math::sqrt(max_size / aspect);
			Size2i new_size = Size2i(height * aspect, height);
			RendererSceneOcclusionCull::get_singleton()->buffer_set_size(p_viewport->self, new_size);
			p_viewport->occlusion_buffer_dirty = false;
		}
	}

	float screen_lod_threshold = p_viewport->lod_threshold / float(p_viewport->size.width);
	RSG::scene->render_camera(p_viewport->render_buffers, p_viewport->camera, p_viewport->scenario, p_viewport->self, p_viewport->size, screen_lod_threshold, p_viewport->shadow_atlas, xr_interface, &p_viewport->render_info);

	RENDER_TIMESTAMP("<End Rendering 3D Scene");
}

void RendererViewport::_draw_viewport(Viewport *p_viewport) {
	if (p_viewport->measure_render_time) {
		String rt_id = "vp_begin_" + itos(p_viewport->self.get_id());
		RSG::storage->capture_timestamp(rt_id);
		timestamp_vp_map[rt_id] = p_viewport->self;
	}

	if (OS::get_singleton()->get_current_rendering_driver_name() == "opengl") {
		// This is currently needed for GLES to keep the current window being rendered to up to date
		DisplayServer::get_singleton()->gl_window_make_current(p_viewport->viewport_to_screen);
	}

	/* Camera should always be BEFORE any other 3D */

	bool scenario_draw_canvas_bg = false; //draw canvas, or some layer of it, as BG for 3D instead of in front
	int scenario_canvas_max_layer = 0;

	for (int i = 0; i < RS::VIEWPORT_RENDER_INFO_TYPE_MAX; i++) {
		for (int j = 0; j < RS::VIEWPORT_RENDER_INFO_MAX; j++) {
			p_viewport->render_info.info[i][j] = 0;
		}
	}

	Color bgcolor = RSG::storage->get_default_clear_color();

	if (!p_viewport->disable_2d && !p_viewport->disable_environment && RSG::scene->is_scenario(p_viewport->scenario)) {
		RID environment = RSG::scene->scenario_get_environment(p_viewport->scenario);
		if (RSG::scene->is_environment(environment)) {
			scenario_draw_canvas_bg = RSG::scene->environment_get_background(environment) == RS::ENV_BG_CANVAS;
			scenario_canvas_max_layer = RSG::scene->environment_get_canvas_max_layer(environment);
		}
	}

	bool can_draw_3d = RSG::scene->is_camera(p_viewport->camera) && !p_viewport->disable_3d;

	if (p_viewport->clear_mode != RS::VIEWPORT_CLEAR_NEVER) {
		if (p_viewport->transparent_bg) {
			bgcolor = Color(0, 0, 0, 0);
		}
		if (p_viewport->clear_mode == RS::VIEWPORT_CLEAR_ONLY_NEXT_FRAME) {
			p_viewport->clear_mode = RS::VIEWPORT_CLEAR_NEVER;
		}
	}

	if ((scenario_draw_canvas_bg || can_draw_3d) && !p_viewport->render_buffers.is_valid()) {
		//wants to draw 3D but there is no render buffer, create
		p_viewport->render_buffers = RSG::scene->render_buffers_create();

		_configure_3d_render_buffers(p_viewport);
	}

	RSG::storage->render_target_request_clear(p_viewport->render_target, bgcolor);

	if (!scenario_draw_canvas_bg && can_draw_3d) {
		_draw_3d(p_viewport);
	}

	if (!p_viewport->disable_2d) {
		int i = 0;

		Map<Viewport::CanvasKey, Viewport::CanvasData *> canvas_map;

		Rect2 clip_rect(0, 0, p_viewport->size.x, p_viewport->size.y);
		RendererCanvasRender::Light *lights = nullptr;
		RendererCanvasRender::Light *lights_with_shadow = nullptr;

		RendererCanvasRender::Light *directional_lights = nullptr;
		RendererCanvasRender::Light *directional_lights_with_shadow = nullptr;

		if (p_viewport->sdf_active) {
			//process SDF

			Rect2 sdf_rect = RSG::storage->render_target_get_sdf_rect(p_viewport->render_target);

			RendererCanvasRender::LightOccluderInstance *occluders = nullptr;

			//make list of occluders
			for (KeyValue<RID, Viewport::CanvasData> &E : p_viewport->canvas_map) {
				RendererCanvasCull::Canvas *canvas = static_cast<RendererCanvasCull::Canvas *>(E.value.canvas);
				Transform2D xf = _canvas_get_transform(p_viewport, canvas, &E.value, clip_rect.size);

				for (Set<RendererCanvasRender::LightOccluderInstance *>::Element *F = canvas->occluders.front(); F; F = F->next()) {
					if (!F->get()->enabled) {
						continue;
					}
					F->get()->xform_cache = xf * F->get()->xform;

					if (sdf_rect.intersects_transformed(F->get()->xform_cache, F->get()->aabb_cache)) {
						F->get()->next = occluders;
						occluders = F->get();
					}
				}
			}

			RSG::canvas_render->render_sdf(p_viewport->render_target, occluders);
			RSG::storage->render_target_mark_sdf_enabled(p_viewport->render_target, true);

			p_viewport->sdf_active = false; // if used, gets set active again
		} else {
			RSG::storage->render_target_mark_sdf_enabled(p_viewport->render_target, false);
		}

		Rect2 shadow_rect;

		int light_count = 0;
		int shadow_count = 0;
		int directional_light_count = 0;

		RENDER_TIMESTAMP("Cull Canvas Lights");
		for (KeyValue<RID, Viewport::CanvasData> &E : p_viewport->canvas_map) {
			RendererCanvasCull::Canvas *canvas = static_cast<RendererCanvasCull::Canvas *>(E.value.canvas);

			Transform2D xf = _canvas_get_transform(p_viewport, canvas, &E.value, clip_rect.size);

			//find lights in canvas

			for (Set<RendererCanvasRender::Light *>::Element *F = canvas->lights.front(); F; F = F->next()) {
				RendererCanvasRender::Light *cl = F->get();
				if (cl->enabled && cl->texture.is_valid()) {
					//not super efficient..
					Size2 tsize = RSG::storage->texture_size_with_proxy(cl->texture);
					tsize *= cl->scale;

					Vector2 offset = tsize / 2.0;
					cl->rect_cache = Rect2(-offset + cl->texture_offset, tsize);
					cl->xform_cache = xf * cl->xform;

					if (clip_rect.intersects_transformed(cl->xform_cache, cl->rect_cache)) {
						cl->filter_next_ptr = lights;
						lights = cl;
						//						cl->texture_cache = nullptr;
						Transform2D scale;
						scale.scale(cl->rect_cache.size);
						scale.elements[2] = cl->rect_cache.position;
						cl->light_shader_xform = cl->xform * scale;
						//cl->light_shader_pos = cl->xform_cache[2];
						if (cl->use_shadow) {
							cl->shadows_next_ptr = lights_with_shadow;
							if (lights_with_shadow == nullptr) {
								shadow_rect = cl->xform_cache.xform(cl->rect_cache);
							} else {
								shadow_rect = shadow_rect.merge(cl->xform_cache.xform(cl->rect_cache));
							}
							lights_with_shadow = cl;
							cl->radius_cache = cl->rect_cache.size.length();
						}

						light_count++;
					}

					//guess this is not needed, but keeping because it may be
				}
			}

			for (Set<RendererCanvasRender::Light *>::Element *F = canvas->directional_lights.front(); F; F = F->next()) {
				RendererCanvasRender::Light *cl = F->get();
				if (cl->enabled) {
					cl->filter_next_ptr = directional_lights;
					directional_lights = cl;
					cl->xform_cache = xf * cl->xform;
					cl->xform_cache.elements[2] = Vector2(); //translation is pointless
					if (cl->use_shadow) {
						cl->shadows_next_ptr = directional_lights_with_shadow;
						directional_lights_with_shadow = cl;
					}

					directional_light_count++;

					if (directional_light_count == RS::MAX_2D_DIRECTIONAL_LIGHTS) {
						break;
					}
				}
			}

			canvas_map[Viewport::CanvasKey(E.key, E.value.layer, E.value.sublayer)] = &E.value;
		}

		if (lights_with_shadow) {
			//update shadows if any

			RendererCanvasRender::LightOccluderInstance *occluders = nullptr;

			RENDER_TIMESTAMP(">Render 2D Shadows");
			RENDER_TIMESTAMP("Cull Occluders");

			//make list of occluders
			for (KeyValue<RID, Viewport::CanvasData> &E : p_viewport->canvas_map) {
				RendererCanvasCull::Canvas *canvas = static_cast<RendererCanvasCull::Canvas *>(E.value.canvas);
				Transform2D xf = _canvas_get_transform(p_viewport, canvas, &E.value, clip_rect.size);

				for (Set<RendererCanvasRender::LightOccluderInstance *>::Element *F = canvas->occluders.front(); F; F = F->next()) {
					if (!F->get()->enabled) {
						continue;
					}
					F->get()->xform_cache = xf * F->get()->xform;
					if (shadow_rect.intersects_transformed(F->get()->xform_cache, F->get()->aabb_cache)) {
						F->get()->next = occluders;
						occluders = F->get();
					}
				}
			}
			//update the light shadowmaps with them

			RendererCanvasRender::Light *light = lights_with_shadow;
			while (light) {
				RENDER_TIMESTAMP("Render Shadow");

				RSG::canvas_render->light_update_shadow(light->light_internal, shadow_count++, light->xform_cache.affine_inverse(), light->item_shadow_mask, light->radius_cache / 1000.0, light->radius_cache * 1.1, occluders);
				light = light->shadows_next_ptr;
			}

			RENDER_TIMESTAMP("<End rendering 2D Shadows");
		}

		if (directional_lights_with_shadow) {
			//update shadows if any
			RendererCanvasRender::Light *light = directional_lights_with_shadow;
			while (light) {
				Vector2 light_dir = -light->xform_cache.elements[1].normalized(); // Y is light direction
				float cull_distance = light->directional_distance;

				Vector2 light_dir_sign;
				light_dir_sign.x = (ABS(light_dir.x) < CMP_EPSILON) ? 0.0 : ((light_dir.x > 0.0) ? 1.0 : -1.0);
				light_dir_sign.y = (ABS(light_dir.y) < CMP_EPSILON) ? 0.0 : ((light_dir.y > 0.0) ? 1.0 : -1.0);

				Vector2 points[6];
				int point_count = 0;

				for (int j = 0; j < 4; j++) {
					static const Vector2 signs[4] = { Vector2(1, 1), Vector2(1, 0), Vector2(0, 0), Vector2(0, 1) };
					Vector2 sign_cmp = signs[j] * 2.0 - Vector2(1.0, 1.0);
					Vector2 point = clip_rect.position + clip_rect.size * signs[j];

					if (sign_cmp == light_dir_sign) {
						//both point in same direction, plot offsetted
						points[point_count++] = point + light_dir * cull_distance;
					} else if (sign_cmp.x == light_dir_sign.x || sign_cmp.y == light_dir_sign.y) {
						int next_j = (j + 1) % 4;
						Vector2 next_sign_cmp = signs[next_j] * 2.0 - Vector2(1.0, 1.0);

						//one point in the same direction, plot segment

						if (next_sign_cmp.x == light_dir_sign.x || next_sign_cmp.y == light_dir_sign.y) {
							if (light_dir_sign.x != 0.0 || light_dir_sign.y != 0.0) {
								points[point_count++] = point;
							}
							points[point_count++] = point + light_dir * cull_distance;
						} else {
							points[point_count++] = point + light_dir * cull_distance;
							if (light_dir_sign.x != 0.0 || light_dir_sign.y != 0.0) {
								points[point_count++] = point;
							}
						}
					} else {
						//plot normally
						points[point_count++] = point;
					}
				}

				Vector2 xf_points[6];

				RendererCanvasRender::LightOccluderInstance *occluders = nullptr;

				RENDER_TIMESTAMP(">Render Directional 2D Shadows");

				//make list of occluders
				int occ_cullded = 0;
				for (KeyValue<RID, Viewport::CanvasData> &E : p_viewport->canvas_map) {
					RendererCanvasCull::Canvas *canvas = static_cast<RendererCanvasCull::Canvas *>(E.value.canvas);
					Transform2D xf = _canvas_get_transform(p_viewport, canvas, &E.value, clip_rect.size);

					for (Set<RendererCanvasRender::LightOccluderInstance *>::Element *F = canvas->occluders.front(); F; F = F->next()) {
						if (!F->get()->enabled) {
							continue;
						}
						F->get()->xform_cache = xf * F->get()->xform;
						Transform2D localizer = F->get()->xform_cache.affine_inverse();

						for (int j = 0; j < point_count; j++) {
							xf_points[j] = localizer.xform(points[j]);
						}
						if (F->get()->aabb_cache.intersects_filled_polygon(xf_points, point_count)) {
							F->get()->next = occluders;
							occluders = F->get();
							occ_cullded++;
						}
					}
				}

				RSG::canvas_render->light_update_directional_shadow(light->light_internal, shadow_count++, light->xform_cache, light->item_shadow_mask, cull_distance, clip_rect, occluders);

				light = light->shadows_next_ptr;
			}

			RENDER_TIMESTAMP("<Render Directional 2D Shadows");
		}

		if (scenario_draw_canvas_bg && canvas_map.front() && canvas_map.front()->key().get_layer() > scenario_canvas_max_layer) {
			if (!can_draw_3d) {
				RSG::scene->render_empty_scene(p_viewport->render_buffers, p_viewport->scenario, p_viewport->shadow_atlas);
			} else {
				_draw_3d(p_viewport);
			}
			scenario_draw_canvas_bg = false;
		}

		for (const KeyValue<Viewport::CanvasKey, Viewport::CanvasData *> &E : canvas_map) {
			RendererCanvasCull::Canvas *canvas = static_cast<RendererCanvasCull::Canvas *>(E.value->canvas);

			Transform2D xform = _canvas_get_transform(p_viewport, canvas, E.value, clip_rect.size);

			RendererCanvasRender::Light *canvas_lights = nullptr;
			RendererCanvasRender::Light *canvas_directional_lights = nullptr;

			RendererCanvasRender::Light *ptr = lights;
			while (ptr) {
				if (E.value->layer >= ptr->layer_min && E.value->layer <= ptr->layer_max) {
					ptr->next_ptr = canvas_lights;
					canvas_lights = ptr;
				}
				ptr = ptr->filter_next_ptr;
			}

			ptr = directional_lights;
			while (ptr) {
				if (E.value->layer >= ptr->layer_min && E.value->layer <= ptr->layer_max) {
					ptr->next_ptr = canvas_directional_lights;
					canvas_directional_lights = ptr;
				}
				ptr = ptr->filter_next_ptr;
			}

			RSG::canvas->render_canvas(p_viewport->render_target, canvas, xform, canvas_lights, canvas_directional_lights, clip_rect, p_viewport->texture_filter, p_viewport->texture_repeat, p_viewport->snap_2d_transforms_to_pixel, p_viewport->snap_2d_vertices_to_pixel);
			if (RSG::canvas->was_sdf_used()) {
				p_viewport->sdf_active = true;
			}
			i++;

			if (scenario_draw_canvas_bg && E.key.get_layer() >= scenario_canvas_max_layer) {
				if (!can_draw_3d) {
					RSG::scene->render_empty_scene(p_viewport->render_buffers, p_viewport->scenario, p_viewport->shadow_atlas);
				} else {
					_draw_3d(p_viewport);
				}

				scenario_draw_canvas_bg = false;
			}
		}

		if (scenario_draw_canvas_bg) {
			if (!can_draw_3d) {
				RSG::scene->render_empty_scene(p_viewport->render_buffers, p_viewport->scenario, p_viewport->shadow_atlas);
			} else {
				_draw_3d(p_viewport);
			}
		}
	}

	if (RSG::storage->render_target_is_clear_requested(p_viewport->render_target)) {
		//was never cleared in the end, force clear it
		RSG::storage->render_target_do_clear_request(p_viewport->render_target);
	}

	if (p_viewport->measure_render_time) {
		String rt_id = "vp_end_" + itos(p_viewport->self.get_id());
		RSG::storage->capture_timestamp(rt_id);
		timestamp_vp_map[rt_id] = p_viewport->self;
	}
}

void RendererViewport::draw_viewports() {
	timestamp_vp_map.clear();

	// get our xr interface in case we need it
	Ref<XRInterface> xr_interface;

	if (XRServer::get_singleton() != nullptr) {
		xr_interface = XRServer::get_singleton()->get_primary_interface();
	}

	if (Engine::get_singleton()->is_editor_hint()) {
		set_default_clear_color(GLOBAL_GET("rendering/environment/defaults/default_clear_color"));
	}

	//sort viewports
	active_viewports.sort_custom<ViewportSort>();

	Map<DisplayServer::WindowID, Vector<BlitToScreen>> blit_to_screen_list;
	//draw viewports
	RENDER_TIMESTAMP(">Render Viewports");

	//determine what is visible
	draw_viewports_pass++;

	for (int i = active_viewports.size() - 1; i >= 0; i--) { //to compute parent dependency, must go in reverse draw order

		Viewport *vp = active_viewports[i];

		if (vp->update_mode == RS::VIEWPORT_UPDATE_DISABLED) {
			continue;
		}

		if (!vp->render_target.is_valid()) {
			continue;
		}
		//ERR_CONTINUE(!vp->render_target.is_valid());

		bool visible = vp->viewport_to_screen_rect != Rect2();

		if (vp->update_mode == RS::VIEWPORT_UPDATE_ALWAYS || vp->update_mode == RS::VIEWPORT_UPDATE_ONCE) {
			visible = true;
		}

		if (vp->update_mode == RS::VIEWPORT_UPDATE_WHEN_VISIBLE && RSG::storage->render_target_was_used(vp->render_target)) {
			visible = true;
		}

		if (vp->update_mode == RS::VIEWPORT_UPDATE_WHEN_PARENT_VISIBLE) {
			Viewport *parent = viewport_owner.get_or_null(vp->parent);
			if (parent && parent->last_pass == draw_viewports_pass) {
				visible = true;
			}
		}

		visible = visible && vp->size.x > 1 && vp->size.y > 1;

		if (visible) {
			vp->last_pass = draw_viewports_pass;
		}
	}

	int vertices_drawn = 0;
	int objects_drawn = 0;
	int draw_calls_used = 0;

	for (int i = 0; i < active_viewports.size(); i++) {
		Viewport *vp = active_viewports[i];

		if (vp->last_pass != draw_viewports_pass) {
			continue; //should not draw
		}

		RENDER_TIMESTAMP(">Rendering Viewport " + itos(i));

		RSG::storage->render_target_set_as_unused(vp->render_target);
		if (vp->use_xr && xr_interface.is_valid()) {
			// override our size, make sure it matches our required size and is created as a stereo target
			vp->size = xr_interface->get_render_target_size();
			uint32_t view_count = xr_interface->get_view_count();
			RSG::storage->render_target_set_size(vp->render_target, vp->size.x, vp->size.y, view_count);

			// check for an external texture destination (disabled for now, not yet supported)
			// RSG::storage->render_target_set_external_texture(vp->render_target, xr_interface->get_external_texture_for_eye(leftOrMono));
			RSG::storage->render_target_set_external_texture(vp->render_target, 0);

			// render...
			RSG::scene->set_debug_draw_mode(vp->debug_draw);

			// and draw viewport
			_draw_viewport(vp);

			// measure

			// commit our eyes
			Vector<BlitToScreen> blits = xr_interface->commit_views(vp->render_target, vp->viewport_to_screen_rect);
			if (vp->viewport_to_screen != DisplayServer::INVALID_WINDOW_ID && blits.size() > 0) {
				if (!blit_to_screen_list.has(vp->viewport_to_screen)) {
					blit_to_screen_list[vp->viewport_to_screen] = Vector<BlitToScreen>();
				}

				for (int b = 0; b < blits.size(); b++) {
					blit_to_screen_list[vp->viewport_to_screen].push_back(blits[b]);
				}
			}

			// and for our frame timing, mark when we've finished committing our eyes
			XRServer::get_singleton()->_mark_commit();
		} else {
			RSG::storage->render_target_set_external_texture(vp->render_target, 0);

			RSG::scene->set_debug_draw_mode(vp->debug_draw);

			// render standard mono camera
			_draw_viewport(vp);

			if (vp->viewport_to_screen != DisplayServer::INVALID_WINDOW_ID && (!vp->viewport_render_direct_to_screen || !RSG::rasterizer->is_low_end())) {
				//copy to screen if set as such
				BlitToScreen blit;
				blit.render_target = vp->render_target;
				if (vp->viewport_to_screen_rect != Rect2()) {
					blit.dst_rect = vp->viewport_to_screen_rect;
				} else {
					blit.dst_rect.position = Vector2();
					blit.dst_rect.size = vp->size;
				}

				if (!blit_to_screen_list.has(vp->viewport_to_screen)) {
					blit_to_screen_list[vp->viewport_to_screen] = Vector<BlitToScreen>();
				}

				blit_to_screen_list[vp->viewport_to_screen].push_back(blit);
			}
		}

		if (vp->update_mode == RS::VIEWPORT_UPDATE_ONCE) {
			vp->update_mode = RS::VIEWPORT_UPDATE_DISABLED;
		}

		RENDER_TIMESTAMP("<Rendering Viewport " + itos(i));

		objects_drawn += vp->render_info.info[RS::VIEWPORT_RENDER_INFO_TYPE_VISIBLE][RS::VIEWPORT_RENDER_INFO_OBJECTS_IN_FRAME] + vp->render_info.info[RS::VIEWPORT_RENDER_INFO_TYPE_SHADOW][RS::VIEWPORT_RENDER_INFO_OBJECTS_IN_FRAME];
		vertices_drawn += vp->render_info.info[RS::VIEWPORT_RENDER_INFO_TYPE_VISIBLE][RS::VIEWPORT_RENDER_INFO_PRIMITIVES_IN_FRAME] + vp->render_info.info[RS::VIEWPORT_RENDER_INFO_TYPE_SHADOW][RS::VIEWPORT_RENDER_INFO_PRIMITIVES_IN_FRAME];
		draw_calls_used += vp->render_info.info[RS::VIEWPORT_RENDER_INFO_TYPE_VISIBLE][RS::VIEWPORT_RENDER_INFO_DRAW_CALLS_IN_FRAME] + vp->render_info.info[RS::VIEWPORT_RENDER_INFO_TYPE_SHADOW][RS::VIEWPORT_RENDER_INFO_DRAW_CALLS_IN_FRAME];
	}
	RSG::scene->set_debug_draw_mode(RS::VIEWPORT_DEBUG_DRAW_DISABLED);

	total_objects_drawn = objects_drawn;
	total_vertices_drawn = vertices_drawn;
	total_draw_calls_used = draw_calls_used;

	RENDER_TIMESTAMP("<Render Viewports");
	//this needs to be called to make screen swapping more efficient
	RSG::rasterizer->prepare_for_blitting_render_targets();

	for (const KeyValue<int, Vector<BlitToScreen>> &E : blit_to_screen_list) {
		RSG::rasterizer->blit_render_targets_to_screen(E.key, E.value.ptr(), E.value.size());
	}
}

RID RendererViewport::viewport_allocate() {
	return viewport_owner.allocate_rid();
}

void RendererViewport::viewport_initialize(RID p_rid) {
	viewport_owner.initialize_rid(p_rid);
	Viewport *viewport = viewport_owner.get_or_null(p_rid);
	viewport->self = p_rid;
	viewport->render_target = RSG::storage->render_target_create();
	viewport->shadow_atlas = RSG::scene->shadow_atlas_create();
	viewport->viewport_render_direct_to_screen = false;
}

void RendererViewport::viewport_set_use_xr(RID p_viewport, bool p_use_xr) {
	Viewport *viewport = viewport_owner.get_or_null(p_viewport);
	ERR_FAIL_COND(!viewport);

	if (viewport->use_xr == p_use_xr) {
		return;
	}

	viewport->use_xr = p_use_xr;
	_configure_3d_render_buffers(viewport);
}

void RendererViewport::viewport_set_scale_3d(RID p_viewport, float p_scale_3d) {
	Viewport *viewport = viewport_owner.get_or_null(p_viewport);
	ERR_FAIL_COND(!viewport);

	// Clamp to reasonable values that are actually useful.
	// Values above 2.0 don't serve a practical purpose since the viewport
	// isn't displayed with mipmaps.
	if (viewport->scale_3d == CLAMP(p_scale_3d, 0.1, 2.0)) {
		return;
	}

	viewport->scale_3d = CLAMP(p_scale_3d, 0.1, 2.0);
	_configure_3d_render_buffers(viewport);
}

uint32_t RendererViewport::Viewport::get_view_count() {
	uint32_t view_count = 1;

	if (use_xr && XRServer::get_singleton() != nullptr) {
		Ref<XRInterface> xr_interface;

		xr_interface = XRServer::get_singleton()->get_primary_interface();
		if (xr_interface.is_valid()) {
			view_count = xr_interface->get_view_count();
		}
	}

	return view_count;
}

void RendererViewport::viewport_set_size(RID p_viewport, int p_width, int p_height) {
	ERR_FAIL_COND(p_width < 0 && p_height < 0);

	Viewport *viewport = viewport_owner.get_or_null(p_viewport);
	ERR_FAIL_COND(!viewport);

	viewport->size = Size2(p_width, p_height);
	uint32_t view_count = viewport->get_view_count();
	RSG::storage->render_target_set_size(viewport->render_target, p_width, p_height, view_count);
	_configure_3d_render_buffers(viewport);

	viewport->occlusion_buffer_dirty = true;
}

void RendererViewport::viewport_set_active(RID p_viewport, bool p_active) {
	Viewport *viewport = viewport_owner.get_or_null(p_viewport);
	ERR_FAIL_COND(!viewport);

	if (p_active) {
		ERR_FAIL_COND_MSG(active_viewports.find(viewport) != -1, "Can't make active a Viewport that is already active.");
		viewport->occlusion_buffer_dirty = true;
		active_viewports.push_back(viewport);
	} else {
		active_viewports.erase(viewport);
	}
}

void RendererViewport::viewport_set_parent_viewport(RID p_viewport, RID p_parent_viewport) {
	Viewport *viewport = viewport_owner.get_or_null(p_viewport);
	ERR_FAIL_COND(!viewport);

	viewport->parent = p_parent_viewport;
}

void RendererViewport::viewport_set_clear_mode(RID p_viewport, RS::ViewportClearMode p_clear_mode) {
	Viewport *viewport = viewport_owner.get_or_null(p_viewport);
	ERR_FAIL_COND(!viewport);

	viewport->clear_mode = p_clear_mode;
}

void RendererViewport::viewport_attach_to_screen(RID p_viewport, const Rect2 &p_rect, DisplayServer::WindowID p_screen) {
	Viewport *viewport = viewport_owner.get_or_null(p_viewport);
	ERR_FAIL_COND(!viewport);

	if (p_screen != DisplayServer::INVALID_WINDOW_ID) {
		// If using OpenGL we can optimize this operation by rendering directly to system_fbo
		// instead of rendering to fbo and copying to system_fbo after
		if (RSG::rasterizer->is_low_end() && viewport->viewport_render_direct_to_screen) {
			RSG::storage->render_target_set_size(viewport->render_target, p_rect.size.x, p_rect.size.y, viewport->get_view_count());
			RSG::storage->render_target_set_position(viewport->render_target, p_rect.position.x, p_rect.position.y);
		}

		viewport->viewport_to_screen_rect = p_rect;
		viewport->viewport_to_screen = p_screen;
	} else {
		// if render_direct_to_screen was used, reset size and position
		if (RSG::rasterizer->is_low_end() && viewport->viewport_render_direct_to_screen) {
			RSG::storage->render_target_set_position(viewport->render_target, 0, 0);
			RSG::storage->render_target_set_size(viewport->render_target, viewport->size.x, viewport->size.y, viewport->get_view_count());
		}

		viewport->viewport_to_screen_rect = Rect2();
		viewport->viewport_to_screen = DisplayServer::INVALID_WINDOW_ID;
	}
}

void RendererViewport::viewport_set_render_direct_to_screen(RID p_viewport, bool p_enable) {
	Viewport *viewport = viewport_owner.get_or_null(p_viewport);
	ERR_FAIL_COND(!viewport);

	if (p_enable == viewport->viewport_render_direct_to_screen) {
		return;
	}

	// if disabled, reset render_target size and position
	if (!p_enable) {
		RSG::storage->render_target_set_position(viewport->render_target, 0, 0);
		RSG::storage->render_target_set_size(viewport->render_target, viewport->size.x, viewport->size.y, viewport->get_view_count());
	}

	RSG::storage->render_target_set_flag(viewport->render_target, RendererStorage::RENDER_TARGET_DIRECT_TO_SCREEN, p_enable);
	viewport->viewport_render_direct_to_screen = p_enable;

	// if attached to screen already, setup screen size and position, this needs to happen after setting flag to avoid an unnecessary buffer allocation
	if (RSG::rasterizer->is_low_end() && viewport->viewport_to_screen_rect != Rect2() && p_enable) {
		RSG::storage->render_target_set_size(viewport->render_target, viewport->viewport_to_screen_rect.size.x, viewport->viewport_to_screen_rect.size.y, viewport->get_view_count());
		RSG::storage->render_target_set_position(viewport->render_target, viewport->viewport_to_screen_rect.position.x, viewport->viewport_to_screen_rect.position.y);
	}
}

void RendererViewport::viewport_set_update_mode(RID p_viewport, RS::ViewportUpdateMode p_mode) {
	Viewport *viewport = viewport_owner.get_or_null(p_viewport);
	ERR_FAIL_COND(!viewport);

	viewport->update_mode = p_mode;
}

RID RendererViewport::viewport_get_texture(RID p_viewport) const {
	const Viewport *viewport = viewport_owner.get_or_null(p_viewport);
	ERR_FAIL_COND_V(!viewport, RID());

	return RSG::storage->render_target_get_texture(viewport->render_target);
}

RID RendererViewport::viewport_get_occluder_debug_texture(RID p_viewport) const {
	const Viewport *viewport = viewport_owner.get_or_null(p_viewport);
	ERR_FAIL_COND_V(!viewport, RID());

	if (viewport->use_occlusion_culling && viewport->debug_draw == RenderingServer::VIEWPORT_DEBUG_DRAW_OCCLUDERS) {
		return RendererSceneOcclusionCull::get_singleton()->buffer_get_debug_texture(p_viewport);
	}
	return RID();
}

void RendererViewport::viewport_set_disable_2d(RID p_viewport, bool p_disable) {
	Viewport *viewport = viewport_owner.get_or_null(p_viewport);
	ERR_FAIL_COND(!viewport);

	viewport->disable_2d = p_disable;
}

void RendererViewport::viewport_set_disable_environment(RID p_viewport, bool p_disable) {
	Viewport *viewport = viewport_owner.get_or_null(p_viewport);
	ERR_FAIL_COND(!viewport);

	viewport->disable_environment = p_disable;
}

void RendererViewport::viewport_set_disable_3d(RID p_viewport, bool p_disable) {
	Viewport *viewport = viewport_owner.get_or_null(p_viewport);
	ERR_FAIL_COND(!viewport);

	viewport->disable_3d = p_disable;
}

void RendererViewport::viewport_attach_camera(RID p_viewport, RID p_camera) {
	Viewport *viewport = viewport_owner.get_or_null(p_viewport);
	ERR_FAIL_COND(!viewport);

	viewport->camera = p_camera;
}

void RendererViewport::viewport_set_scenario(RID p_viewport, RID p_scenario) {
	Viewport *viewport = viewport_owner.get_or_null(p_viewport);
	ERR_FAIL_COND(!viewport);

	if (viewport->scenario.is_valid()) {
		RSG::scene->scenario_remove_viewport_visibility_mask(viewport->scenario, p_viewport);
	}

	viewport->scenario = p_scenario;
	if (viewport->use_occlusion_culling) {
		RendererSceneOcclusionCull::get_singleton()->buffer_set_scenario(p_viewport, p_scenario);
	}
}

void RendererViewport::viewport_attach_canvas(RID p_viewport, RID p_canvas) {
	Viewport *viewport = viewport_owner.get_or_null(p_viewport);
	ERR_FAIL_COND(!viewport);

	ERR_FAIL_COND(viewport->canvas_map.has(p_canvas));
	RendererCanvasCull::Canvas *canvas = RSG::canvas->canvas_owner.get_or_null(p_canvas);
	ERR_FAIL_COND(!canvas);

	canvas->viewports.insert(p_viewport);
	viewport->canvas_map[p_canvas] = Viewport::CanvasData();
	viewport->canvas_map[p_canvas].layer = 0;
	viewport->canvas_map[p_canvas].sublayer = 0;
	viewport->canvas_map[p_canvas].canvas = canvas;
}

void RendererViewport::viewport_remove_canvas(RID p_viewport, RID p_canvas) {
	Viewport *viewport = viewport_owner.get_or_null(p_viewport);
	ERR_FAIL_COND(!viewport);

	RendererCanvasCull::Canvas *canvas = RSG::canvas->canvas_owner.get_or_null(p_canvas);
	ERR_FAIL_COND(!canvas);

	viewport->canvas_map.erase(p_canvas);
	canvas->viewports.erase(p_viewport);
}

void RendererViewport::viewport_set_canvas_transform(RID p_viewport, RID p_canvas, const Transform2D &p_offset) {
	Viewport *viewport = viewport_owner.get_or_null(p_viewport);
	ERR_FAIL_COND(!viewport);

	ERR_FAIL_COND(!viewport->canvas_map.has(p_canvas));
	viewport->canvas_map[p_canvas].transform = p_offset;
}

void RendererViewport::viewport_set_transparent_background(RID p_viewport, bool p_enabled) {
	Viewport *viewport = viewport_owner.get_or_null(p_viewport);
	ERR_FAIL_COND(!viewport);

	RSG::storage->render_target_set_flag(viewport->render_target, RendererStorage::RENDER_TARGET_TRANSPARENT, p_enabled);
	viewport->transparent_bg = p_enabled;
}

void RendererViewport::viewport_set_global_canvas_transform(RID p_viewport, const Transform2D &p_transform) {
	Viewport *viewport = viewport_owner.get_or_null(p_viewport);
	ERR_FAIL_COND(!viewport);

	viewport->global_transform = p_transform;
}

void RendererViewport::viewport_set_canvas_stacking(RID p_viewport, RID p_canvas, int p_layer, int p_sublayer) {
	Viewport *viewport = viewport_owner.get_or_null(p_viewport);
	ERR_FAIL_COND(!viewport);

	ERR_FAIL_COND(!viewport->canvas_map.has(p_canvas));
	viewport->canvas_map[p_canvas].layer = p_layer;
	viewport->canvas_map[p_canvas].sublayer = p_sublayer;
}

void RendererViewport::viewport_set_shadow_atlas_size(RID p_viewport, int p_size, bool p_16_bits) {
	Viewport *viewport = viewport_owner.get_or_null(p_viewport);
	ERR_FAIL_COND(!viewport);

	viewport->shadow_atlas_size = p_size;
	viewport->shadow_atlas_16_bits = p_16_bits;

	RSG::scene->shadow_atlas_set_size(viewport->shadow_atlas, viewport->shadow_atlas_size, viewport->shadow_atlas_16_bits);
}

void RendererViewport::viewport_set_shadow_atlas_quadrant_subdivision(RID p_viewport, int p_quadrant, int p_subdiv) {
	Viewport *viewport = viewport_owner.get_or_null(p_viewport);
	ERR_FAIL_COND(!viewport);

	RSG::scene->shadow_atlas_set_quadrant_subdivision(viewport->shadow_atlas, p_quadrant, p_subdiv);
}

void RendererViewport::viewport_set_msaa(RID p_viewport, RS::ViewportMSAA p_msaa) {
	Viewport *viewport = viewport_owner.get_or_null(p_viewport);
	ERR_FAIL_COND(!viewport);

	if (viewport->msaa == p_msaa) {
		return;
	}
	viewport->msaa = p_msaa;
	_configure_3d_render_buffers(viewport);
}

void RendererViewport::viewport_set_screen_space_aa(RID p_viewport, RS::ViewportScreenSpaceAA p_mode) {
	Viewport *viewport = viewport_owner.get_or_null(p_viewport);
	ERR_FAIL_COND(!viewport);

	if (viewport->screen_space_aa == p_mode) {
		return;
	}
	viewport->screen_space_aa = p_mode;
	_configure_3d_render_buffers(viewport);
}

void RendererViewport::viewport_set_use_debanding(RID p_viewport, bool p_use_debanding) {
	Viewport *viewport = viewport_owner.get_or_null(p_viewport);
	ERR_FAIL_COND(!viewport);

	if (viewport->use_debanding == p_use_debanding) {
		return;
	}
	viewport->use_debanding = p_use_debanding;
	_configure_3d_render_buffers(viewport);
}

void RendererViewport::viewport_set_use_occlusion_culling(RID p_viewport, bool p_use_occlusion_culling) {
	Viewport *viewport = viewport_owner.get_or_null(p_viewport);
	ERR_FAIL_COND(!viewport);

	if (viewport->use_occlusion_culling == p_use_occlusion_culling) {
		return;
	}
	viewport->use_occlusion_culling = p_use_occlusion_culling;

	if (viewport->use_occlusion_culling) {
		RendererSceneOcclusionCull::get_singleton()->add_buffer(p_viewport);
		RendererSceneOcclusionCull::get_singleton()->buffer_set_scenario(p_viewport, viewport->scenario);
	} else {
		RendererSceneOcclusionCull::get_singleton()->remove_buffer(p_viewport);
	}

	viewport->occlusion_buffer_dirty = true;
}

void RendererViewport::viewport_set_occlusion_rays_per_thread(int p_rays_per_thread) {
	if (occlusion_rays_per_thread == p_rays_per_thread) {
		return;
	}

	occlusion_rays_per_thread = p_rays_per_thread;

	for (int i = 0; i < active_viewports.size(); i++) {
		active_viewports[i]->occlusion_buffer_dirty = true;
	}
}

void RendererViewport::viewport_set_occlusion_culling_build_quality(RS::ViewportOcclusionCullingBuildQuality p_quality) {
	RendererSceneOcclusionCull::get_singleton()->set_build_quality(p_quality);
}

void RendererViewport::viewport_set_lod_threshold(RID p_viewport, float p_pixels) {
	Viewport *viewport = viewport_owner.get_or_null(p_viewport);
	ERR_FAIL_COND(!viewport);

	viewport->lod_threshold = p_pixels;
}

int RendererViewport::viewport_get_render_info(RID p_viewport, RS::ViewportRenderInfoType p_type, RS::ViewportRenderInfo p_info) {
	ERR_FAIL_INDEX_V(p_type, RS::VIEWPORT_RENDER_INFO_TYPE_MAX, -1);
	ERR_FAIL_INDEX_V(p_info, RS::VIEWPORT_RENDER_INFO_MAX, -1);

	Viewport *viewport = viewport_owner.get_or_null(p_viewport);
	if (!viewport) {
		return 0; //there should be a lock here..
	}

	return viewport->render_info.info[p_type][p_info];
}

void RendererViewport::viewport_set_debug_draw(RID p_viewport, RS::ViewportDebugDraw p_draw) {
	Viewport *viewport = viewport_owner.get_or_null(p_viewport);
	ERR_FAIL_COND(!viewport);

	viewport->debug_draw = p_draw;
}

void RendererViewport::viewport_set_measure_render_time(RID p_viewport, bool p_enable) {
	Viewport *viewport = viewport_owner.get_or_null(p_viewport);
	ERR_FAIL_COND(!viewport);

	viewport->measure_render_time = p_enable;
}

float RendererViewport::viewport_get_measured_render_time_cpu(RID p_viewport) const {
	Viewport *viewport = viewport_owner.get_or_null(p_viewport);
	ERR_FAIL_COND_V(!viewport, 0);

	return double(viewport->time_cpu_end - viewport->time_cpu_begin) / 1000.0;
}

float RendererViewport::viewport_get_measured_render_time_gpu(RID p_viewport) const {
	Viewport *viewport = viewport_owner.get_or_null(p_viewport);
	ERR_FAIL_COND_V(!viewport, 0);

	return double((viewport->time_gpu_end - viewport->time_gpu_begin) / 1000) / 1000.0;
}

void RendererViewport::viewport_set_snap_2d_transforms_to_pixel(RID p_viewport, bool p_enabled) {
	Viewport *viewport = viewport_owner.get_or_null(p_viewport);
	ERR_FAIL_COND(!viewport);
	viewport->snap_2d_transforms_to_pixel = p_enabled;
}

void RendererViewport::viewport_set_snap_2d_vertices_to_pixel(RID p_viewport, bool p_enabled) {
	Viewport *viewport = viewport_owner.get_or_null(p_viewport);
	ERR_FAIL_COND(!viewport);
	viewport->snap_2d_vertices_to_pixel = p_enabled;
}

void RendererViewport::viewport_set_default_canvas_item_texture_filter(RID p_viewport, RS::CanvasItemTextureFilter p_filter) {
	ERR_FAIL_COND_MSG(p_filter == RS::CANVAS_ITEM_TEXTURE_FILTER_DEFAULT, "Viewport does not accept DEFAULT as texture filter (it's the topmost choice already).)");
	Viewport *viewport = viewport_owner.get_or_null(p_viewport);
	ERR_FAIL_COND(!viewport);

	viewport->texture_filter = p_filter;
}
void RendererViewport::viewport_set_default_canvas_item_texture_repeat(RID p_viewport, RS::CanvasItemTextureRepeat p_repeat) {
	ERR_FAIL_COND_MSG(p_repeat == RS::CANVAS_ITEM_TEXTURE_REPEAT_DEFAULT, "Viewport does not accept DEFAULT as texture repeat (it's the topmost choice already).)");
	Viewport *viewport = viewport_owner.get_or_null(p_viewport);
	ERR_FAIL_COND(!viewport);

	viewport->texture_repeat = p_repeat;
}

void RendererViewport::viewport_set_sdf_oversize_and_scale(RID p_viewport, RS::ViewportSDFOversize p_size, RS::ViewportSDFScale p_scale) {
	Viewport *viewport = viewport_owner.get_or_null(p_viewport);
	ERR_FAIL_COND(!viewport);

	RSG::storage->render_target_set_sdf_size_and_scale(viewport->render_target, p_size, p_scale);
}

bool RendererViewport::free(RID p_rid) {
	if (viewport_owner.owns(p_rid)) {
		Viewport *viewport = viewport_owner.get_or_null(p_rid);

		RSG::storage->free(viewport->render_target);
		RSG::scene->free(viewport->shadow_atlas);
		if (viewport->render_buffers.is_valid()) {
			RSG::scene->free(viewport->render_buffers);
		}

		while (viewport->canvas_map.front()) {
			viewport_remove_canvas(p_rid, viewport->canvas_map.front()->key());
		}

		viewport_set_scenario(p_rid, RID());
		active_viewports.erase(viewport);

		if (viewport->use_occlusion_culling) {
			RendererSceneOcclusionCull::get_singleton()->remove_buffer(p_rid);
		}

		viewport_owner.free(p_rid);

		return true;
	}

	return false;
}

void RendererViewport::handle_timestamp(String p_timestamp, uint64_t p_cpu_time, uint64_t p_gpu_time) {
	RID *vp = timestamp_vp_map.getptr(p_timestamp);
	if (!vp) {
		return;
	}

	Viewport *viewport = viewport_owner.get_or_null(*vp);
	if (!viewport) {
		return;
	}

	if (p_timestamp.begins_with("vp_begin")) {
		viewport->time_cpu_begin = p_cpu_time;
		viewport->time_gpu_begin = p_gpu_time;
	}

	if (p_timestamp.begins_with("vp_end")) {
		viewport->time_cpu_end = p_cpu_time;
		viewport->time_gpu_end = p_gpu_time;
	}
}

void RendererViewport::set_default_clear_color(const Color &p_color) {
	RSG::storage->set_default_clear_color(p_color);
}

// Workaround for setting this on thread.
void RendererViewport::call_set_vsync_mode(DisplayServer::VSyncMode p_mode, DisplayServer::WindowID p_window) {
	DisplayServer::get_singleton()->window_set_vsync_mode(p_mode, p_window);
}

int RendererViewport::get_total_objects_drawn() const {
	return total_objects_drawn;
}
int RendererViewport::get_total_vertices_drawn() const {
	return total_vertices_drawn;
}
int RendererViewport::get_total_draw_calls_used() const {
	return total_draw_calls_used;
}

RendererViewport::RendererViewport() {
	occlusion_rays_per_thread = GLOBAL_GET("rendering/occlusion_culling/occlusion_rays_per_thread");
}