/*************************************************************************/
/*  renderer_storage.h                                                   */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md).   */
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/*************************************************************************/

#ifndef RENDERINGSERVERSTORAGE_H
#define RENDERINGSERVERSTORAGE_H

#include "servers/rendering_server.h"

class RendererStorage {
	Color default_clear_color;

public:
	enum DependencyChangedNotification {
		DEPENDENCY_CHANGED_AABB,
		DEPENDENCY_CHANGED_MATERIAL,
		DEPENDENCY_CHANGED_MESH,
		DEPENDENCY_CHANGED_MULTIMESH,
		DEPENDENCY_CHANGED_MULTIMESH_VISIBLE_INSTANCES,
		DEPENDENCY_CHANGED_PARTICLES,
		DEPENDENCY_CHANGED_DECAL,
		DEPENDENCY_CHANGED_SKELETON_DATA,
		DEPENDENCY_CHANGED_SKELETON_BONES,
		DEPENDENCY_CHANGED_LIGHT,
		DEPENDENCY_CHANGED_LIGHT_SOFT_SHADOW_AND_PROJECTOR,
		DEPENDENCY_CHANGED_REFLECTION_PROBE,
	};

	struct DependencyTracker;

	struct Dependency {
		void changed_notify(DependencyChangedNotification p_notification);
		void deleted_notify(const RID &p_rid);

		~Dependency();

	private:
		friend struct DependencyTracker;
		Map<DependencyTracker *, uint32_t> instances;
	};

	struct DependencyTracker {
		void *userdata = nullptr;
		typedef void (*ChangedCallback)(DependencyChangedNotification, DependencyTracker *);
		typedef void (*DeletedCallback)(const RID &, DependencyTracker *);

		ChangedCallback changed_callback = nullptr;
		DeletedCallback deleted_callback = nullptr;

		void update_begin() { // call before updating dependencies
			instance_version++;
		}

		void update_dependency(Dependency *p_dependency) { //called internally, can't be used directly, use update functions in Storage
			dependencies.insert(p_dependency);
			p_dependency->instances[this] = instance_version;
		}

		void update_end() { //call after updating dependencies
			List<Pair<Dependency *, Map<DependencyTracker *, uint32_t>::Element *>> to_clean_up;
			for (Set<Dependency *>::Element *E = dependencies.front(); E; E = E->next()) {
				Dependency *dep = E->get();
				Map<DependencyTracker *, uint32_t>::Element *F = dep->instances.find(this);
				ERR_CONTINUE(!F);
				if (F->get() != instance_version) {
					Pair<Dependency *, Map<DependencyTracker *, uint32_t>::Element *> p;
					p.first = dep;
					p.second = F;
					to_clean_up.push_back(p);
				}
			}

			while (to_clean_up.size()) {
				to_clean_up.front()->get().first->instances.erase(to_clean_up.front()->get().second);
				dependencies.erase(to_clean_up.front()->get().first);
				to_clean_up.pop_front();
			}
		}

		void clear() { // clear all dependencies
			for (Set<Dependency *>::Element *E = dependencies.front(); E; E = E->next()) {
				Dependency *dep = E->get();
				dep->instances.erase(this);
			}
			dependencies.clear();
		}

		~DependencyTracker() { clear(); }

	private:
		friend struct Dependency;
		uint32_t instance_version = 0;
		Set<Dependency *> dependencies;
	};

	virtual void base_update_dependency(RID p_base, DependencyTracker *p_instance) = 0;

	/* VOXEL GI API */

	virtual RID voxel_gi_allocate() = 0;
	virtual void voxel_gi_initialize(RID p_rid) = 0;

	virtual void voxel_gi_allocate_data(RID p_voxel_gi, const Transform3D &p_to_cell_xform, const AABB &p_aabb, const Vector3i &p_octree_size, const Vector<uint8_t> &p_octree_cells, const Vector<uint8_t> &p_data_cells, const Vector<uint8_t> &p_distance_field, const Vector<int> &p_level_counts) = 0;

	virtual AABB voxel_gi_get_bounds(RID p_voxel_gi) const = 0;
	virtual Vector3i voxel_gi_get_octree_size(RID p_voxel_gi) const = 0;
	virtual Vector<uint8_t> voxel_gi_get_octree_cells(RID p_voxel_gi) const = 0;
	virtual Vector<uint8_t> voxel_gi_get_data_cells(RID p_voxel_gi) const = 0;
	virtual Vector<uint8_t> voxel_gi_get_distance_field(RID p_voxel_gi) const = 0;

	virtual Vector<int> voxel_gi_get_level_counts(RID p_voxel_gi) const = 0;
	virtual Transform3D voxel_gi_get_to_cell_xform(RID p_voxel_gi) const = 0;

	virtual void voxel_gi_set_dynamic_range(RID p_voxel_gi, float p_range) = 0;
	virtual float voxel_gi_get_dynamic_range(RID p_voxel_gi) const = 0;

	virtual void voxel_gi_set_propagation(RID p_voxel_gi, float p_range) = 0;
	virtual float voxel_gi_get_propagation(RID p_voxel_gi) const = 0;

	virtual void voxel_gi_set_energy(RID p_voxel_gi, float p_energy) = 0;
	virtual float voxel_gi_get_energy(RID p_voxel_gi) const = 0;

	virtual void voxel_gi_set_bias(RID p_voxel_gi, float p_bias) = 0;
	virtual float voxel_gi_get_bias(RID p_voxel_gi) const = 0;

	virtual void voxel_gi_set_normal_bias(RID p_voxel_gi, float p_range) = 0;
	virtual float voxel_gi_get_normal_bias(RID p_voxel_gi) const = 0;

	virtual void voxel_gi_set_interior(RID p_voxel_gi, bool p_enable) = 0;
	virtual bool voxel_gi_is_interior(RID p_voxel_gi) const = 0;

	virtual void voxel_gi_set_use_two_bounces(RID p_voxel_gi, bool p_enable) = 0;
	virtual bool voxel_gi_is_using_two_bounces(RID p_voxel_gi) const = 0;

	virtual void voxel_gi_set_anisotropy_strength(RID p_voxel_gi, float p_strength) = 0;
	virtual float voxel_gi_get_anisotropy_strength(RID p_voxel_gi) const = 0;

	virtual uint32_t voxel_gi_get_version(RID p_probe) = 0;

	/* FOG VOLUMES */

	virtual RID fog_volume_allocate() = 0;
	virtual void fog_volume_initialize(RID p_rid) = 0;

	virtual void fog_volume_set_shape(RID p_fog_volume, RS::FogVolumeShape p_shape) = 0;
	virtual void fog_volume_set_extents(RID p_fog_volume, const Vector3 &p_extents) = 0;
	virtual void fog_volume_set_material(RID p_fog_volume, RID p_material) = 0;
	virtual AABB fog_volume_get_aabb(RID p_fog_volume) const = 0;
	virtual RS::FogVolumeShape fog_volume_get_shape(RID p_fog_volume) const = 0;

	/* VISIBILITY NOTIFIER */

	virtual RID visibility_notifier_allocate() = 0;
	virtual void visibility_notifier_initialize(RID p_notifier) = 0;
	virtual void visibility_notifier_set_aabb(RID p_notifier, const AABB &p_aabb) = 0;
	virtual void visibility_notifier_set_callbacks(RID p_notifier, const Callable &p_enter_callbable, const Callable &p_exit_callable) = 0;

	virtual AABB visibility_notifier_get_aabb(RID p_notifier) const = 0;
	virtual void visibility_notifier_call(RID p_notifier, bool p_enter, bool p_deferred) = 0;

	virtual RS::InstanceType get_base_type(RID p_rid) const = 0;
	virtual bool free(RID p_rid) = 0;

	virtual bool has_os_feature(const String &p_feature) const = 0;

	virtual void update_dirty_resources() = 0;

	virtual void set_debug_generate_wireframes(bool p_generate) = 0;

	virtual void update_memory_info() = 0;

	virtual uint64_t get_rendering_info(RS::RenderingInfo p_info) = 0;
	virtual String get_video_adapter_name() const = 0;
	virtual String get_video_adapter_vendor() const = 0;
	virtual RenderingDevice::DeviceType get_video_adapter_type() const = 0;

	static RendererStorage *base_singleton;

	void set_default_clear_color(const Color &p_color) {
		default_clear_color = p_color;
	}

	Color get_default_clear_color() const {
		return default_clear_color;
	}
#define TIMESTAMP_BEGIN()                             \
	{                                                 \
		if (RSG::storage->capturing_timestamps)       \
			RSG::storage->capture_timestamps_begin(); \
	}

#define RENDER_TIMESTAMP(m_text)                     \
	{                                                \
		if (RSG::storage->capturing_timestamps)      \
			RSG::storage->capture_timestamp(m_text); \
	}

	bool capturing_timestamps = false;

	virtual void capture_timestamps_begin() = 0;
	virtual void capture_timestamp(const String &p_name) = 0;
	virtual uint32_t get_captured_timestamps_count() const = 0;
	virtual uint64_t get_captured_timestamps_frame() const = 0;
	virtual uint64_t get_captured_timestamp_gpu_time(uint32_t p_index) const = 0;
	virtual uint64_t get_captured_timestamp_cpu_time(uint32_t p_index) const = 0;
	virtual String get_captured_timestamp_name(uint32_t p_index) const = 0;

	RendererStorage();
	virtual ~RendererStorage() {}
};

#endif // RENDERINGSERVERSTORAGE_H