/*************************************************************************/
/*  renderer_compositor.h                                                */
/*************************************************************************/
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/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
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#ifndef RENDERING_SERVER_COMPOSITOR_H
#define RENDERING_SERVER_COMPOSITOR_H

#include "core/math/camera_matrix.h"
#include "core/templates/pair.h"
#include "core/templates/self_list.h"
#include "servers/rendering/renderer_canvas_render.h"
#include "servers/rendering/renderer_scene.h"
#include "servers/rendering/renderer_storage.h"
#include "servers/rendering_server.h"
class RendererSceneRender;
struct BlitToScreen {
	RID render_target;
	Rect2 src_rect = Rect2(0.0, 0.0, 1.0, 1.0);
	Rect2i dst_rect;

	struct {
		bool use_layer = false;
		uint32_t layer = 0;
	} multi_view;

	struct {
		//lens distorted parameters for VR
		bool apply = false;
		Vector2 eye_center;
		float k1 = 0.0;
		float k2 = 0.0;

		float upscale = 1.0;
		float aspect_ratio = 1.0;
	} lens_distortion;
};

class RendererCompositor {
private:
	bool xr_enabled = false;

protected:
	static RendererCompositor *(*_create_func)();
	bool back_end = false;

public:
	static RendererCompositor *create();

	virtual RendererStorage *get_storage() = 0;
	virtual RendererCanvasRender *get_canvas() = 0;
	virtual RendererSceneRender *get_scene() = 0;

	virtual void set_boot_image(const Ref<Image> &p_image, const Color &p_color, bool p_scale, bool p_use_filter = true) = 0;

	virtual void initialize() = 0;
	virtual void begin_frame(double frame_step) = 0;

	virtual void prepare_for_blitting_render_targets() = 0;
	virtual void blit_render_targets_to_screen(DisplayServer::WindowID p_screen, const BlitToScreen *p_render_targets, int p_amount) = 0;

	virtual void end_frame(bool p_swap_buffers) = 0;
	virtual void finalize() = 0;
	virtual uint64_t get_frame_number() const = 0;
	virtual double get_frame_delta_time() const = 0;

	_FORCE_INLINE_ virtual bool is_low_end() const { return back_end; };
	virtual bool is_xr_enabled() const;

	RendererCompositor();
	virtual ~RendererCompositor() {}
};

#endif // RASTERIZER_H