/*************************************************************************/
/*  rendering_server_viewport.h                                          */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/*************************************************************************/
/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md).   */
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/*************************************************************************/

#ifndef VISUALSERVERVIEWPORT_H
#define VISUALSERVERVIEWPORT_H

#include "core/rid_owner.h"
#include "core/self_list.h"
#include "rasterizer.h"
#include "servers/rendering_server.h"
#include "servers/xr/xr_interface.h"

class RenderingServerViewport {
public:
	struct CanvasBase {
	};

	struct Viewport {

		RID self;
		RID parent;

		bool use_xr; /* use xr interface to override camera positioning and projection matrices and control output */

		Size2i size;
		RID camera;
		RID scenario;

		RS::ViewportUpdateMode update_mode;
		RID render_target;
		RID render_target_texture;
		RID render_buffers;

		RS::ViewportMSAA msaa;

		DisplayServer::WindowID viewport_to_screen;
		Rect2 viewport_to_screen_rect;
		bool viewport_render_direct_to_screen;

		bool hide_scenario;
		bool hide_canvas;
		bool disable_environment;
		bool measure_render_time;

		uint64_t time_cpu_begin;
		uint64_t time_cpu_end;

		uint64_t time_gpu_begin;
		uint64_t time_gpu_end;

		RID shadow_atlas;
		int shadow_atlas_size;

		uint64_t last_pass = 0;

		int render_info[RS::VIEWPORT_RENDER_INFO_MAX];
		RS::ViewportDebugDraw debug_draw;

		RS::ViewportClearMode clear_mode;

		bool transparent_bg;

		struct CanvasKey {

			int64_t stacking;
			RID canvas;
			bool operator<(const CanvasKey &p_canvas) const {
				if (stacking == p_canvas.stacking)
					return canvas < p_canvas.canvas;
				return stacking < p_canvas.stacking;
			}
			CanvasKey() {
				stacking = 0;
			}
			CanvasKey(const RID &p_canvas, int p_layer, int p_sublayer) {
				canvas = p_canvas;
				int64_t sign = p_layer < 0 ? -1 : 1;
				stacking = sign * (((int64_t)ABS(p_layer)) << 32) + p_sublayer;
			}
			int get_layer() const { return stacking >> 32; }
		};

		struct CanvasData {

			CanvasBase *canvas;
			Transform2D transform;
			int layer;
			int sublayer;
		};

		Transform2D global_transform;

		Map<RID, CanvasData> canvas_map;

		Viewport() {
			update_mode = RS::VIEWPORT_UPDATE_WHEN_VISIBLE;
			clear_mode = RS::VIEWPORT_CLEAR_ALWAYS;
			transparent_bg = false;
			disable_environment = false;
			viewport_to_screen = DisplayServer::INVALID_WINDOW_ID;
			shadow_atlas_size = 0;
			measure_render_time = false;

			debug_draw = RS::VIEWPORT_DEBUG_DRAW_DISABLED;
			msaa = RS::VIEWPORT_MSAA_DISABLED;
			for (int i = 0; i < RS::VIEWPORT_RENDER_INFO_MAX; i++) {
				render_info[i] = 0;
			}
			use_xr = false;

			time_cpu_begin = 0;
			time_cpu_end = 0;

			time_gpu_begin = 0;
			time_gpu_end = 0;
		}
	};

	HashMap<String, RID> timestamp_vp_map;

	uint64_t draw_viewports_pass = 0;

	mutable RID_PtrOwner<Viewport> viewport_owner;

	struct ViewportSort {
		_FORCE_INLINE_ bool operator()(const Viewport *p_left, const Viewport *p_right) const {

			bool left_to_screen = p_left->viewport_to_screen_rect.size != Size2();
			bool right_to_screen = p_right->viewport_to_screen_rect.size != Size2();

			if (left_to_screen == right_to_screen) {

				return p_right->parent == p_left->self;
			}
			return (right_to_screen ? 0 : 1) < (left_to_screen ? 0 : 1);
		}
	};

	Vector<Viewport *> active_viewports;

private:
	void _draw_3d(Viewport *p_viewport, XRInterface::Eyes p_eye);
	void _draw_viewport(Viewport *p_viewport, XRInterface::Eyes p_eye = XRInterface::EYE_MONO);

public:
	RID viewport_create();

	void viewport_set_use_xr(RID p_viewport, bool p_use_xr);

	void viewport_set_size(RID p_viewport, int p_width, int p_height);

	void viewport_attach_to_screen(RID p_viewport, const Rect2 &p_rect = Rect2(), DisplayServer::WindowID p_screen = DisplayServer::MAIN_WINDOW_ID);
	void viewport_set_render_direct_to_screen(RID p_viewport, bool p_enable);

	void viewport_set_active(RID p_viewport, bool p_active);
	void viewport_set_parent_viewport(RID p_viewport, RID p_parent_viewport);
	void viewport_set_update_mode(RID p_viewport, RS::ViewportUpdateMode p_mode);
	void viewport_set_vflip(RID p_viewport, bool p_enable);

	void viewport_set_clear_mode(RID p_viewport, RS::ViewportClearMode p_clear_mode);

	RID viewport_get_texture(RID p_viewport) const;

	void viewport_set_hide_scenario(RID p_viewport, bool p_hide);
	void viewport_set_hide_canvas(RID p_viewport, bool p_hide);
	void viewport_set_disable_environment(RID p_viewport, bool p_disable);

	void viewport_attach_camera(RID p_viewport, RID p_camera);
	void viewport_set_scenario(RID p_viewport, RID p_scenario);
	void viewport_attach_canvas(RID p_viewport, RID p_canvas);
	void viewport_remove_canvas(RID p_viewport, RID p_canvas);
	void viewport_set_canvas_transform(RID p_viewport, RID p_canvas, const Transform2D &p_offset);
	void viewport_set_transparent_background(RID p_viewport, bool p_enabled);

	void viewport_set_global_canvas_transform(RID p_viewport, const Transform2D &p_transform);
	void viewport_set_canvas_stacking(RID p_viewport, RID p_canvas, int p_layer, int p_sublayer);

	void viewport_set_shadow_atlas_size(RID p_viewport, int p_size);
	void viewport_set_shadow_atlas_quadrant_subdivision(RID p_viewport, int p_quadrant, int p_subdiv);

	void viewport_set_msaa(RID p_viewport, RS::ViewportMSAA p_msaa);

	virtual int viewport_get_render_info(RID p_viewport, RS::ViewportRenderInfo p_info);
	virtual void viewport_set_debug_draw(RID p_viewport, RS::ViewportDebugDraw p_draw);

	void viewport_set_measure_render_time(RID p_viewport, bool p_enable);
	float viewport_get_measured_render_time_cpu(RID p_viewport) const;
	float viewport_get_measured_render_time_gpu(RID p_viewport) const;

	void handle_timestamp(String p_timestamp, uint64_t p_cpu_time, uint64_t p_gpu_time);

	void set_default_clear_color(const Color &p_color);
	void draw_viewports();

	bool free(RID p_rid);

	RenderingServerViewport();
	virtual ~RenderingServerViewport() {}
};

#endif // VISUALSERVERVIEWPORT_H