/*************************************************************************/
/*  rasterizer_storage_gles3.h                                           */
/*************************************************************************/
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/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
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#ifndef RASTERIZER_STORAGE_OPENGL_H
#define RASTERIZER_STORAGE_OPENGL_H

#ifdef GLES3_ENABLED

#include "core/templates/local_vector.h"
#include "core/templates/rid_owner.h"
#include "core/templates/self_list.h"
#include "servers/rendering/renderer_compositor.h"
#include "servers/rendering/renderer_storage.h"
#include "servers/rendering/shader_compiler.h"
#include "servers/rendering/shader_language.h"
#include "storage/config.h"
#include "storage/material_storage.h"
#include "storage/texture_storage.h"

// class RasterizerCanvasGLES3;
// class RasterizerSceneGLES3;

class RasterizerStorageGLES3 : public RendererStorage {
public:
	// RasterizerCanvasGLES3 *canvas;
	// RasterizerSceneGLES3 *scene;

	GLES3::Config *config;

	struct Resources {
		GLuint white_tex;
		GLuint black_tex;
		GLuint normal_tex;
		GLuint aniso_tex;

		GLuint mipmap_blur_fbo;
		GLuint mipmap_blur_color;

		GLuint radical_inverse_vdc_cache_tex;
		bool use_rgba_2d_shadows;

		GLuint quadie;

		size_t skeleton_transform_buffer_size;
		GLuint skeleton_transform_buffer;
		LocalVector<float> skeleton_transform_cpu_buffer;

	} resources;

	struct Info {
		uint64_t texture_mem = 0;
		uint64_t vertex_mem = 0;

		struct Render {
			uint32_t object_count;
			uint32_t draw_call_count;
			uint32_t material_switch_count;
			uint32_t surface_switch_count;
			uint32_t shader_rebind_count;
			uint32_t vertices_count;
			uint32_t _2d_item_count;
			uint32_t _2d_draw_call_count;

			void reset() {
				object_count = 0;
				draw_call_count = 0;
				material_switch_count = 0;
				surface_switch_count = 0;
				shader_rebind_count = 0;
				vertices_count = 0;
				_2d_item_count = 0;
				_2d_draw_call_count = 0;
			}
		} render, render_final, snap;

		Info() {
			render.reset();
			render_final.reset();
		}

	} info;

	void bind_quad_array() const;

	/////////////////////////////////////////////////////////////////////////////////////////
	//////////////////////////////////API////////////////////////////////////////////////////
	/////////////////////////////////////////////////////////////////////////////////////////

public:
	virtual void base_update_dependency(RID p_base, DependencyTracker *p_instance) override;

	/* SKY API */
	// not sure if used in godot 4?
	struct Sky {
		RID self;
		RID panorama;
		GLuint radiance;
		int radiance_size;
	};

	mutable RID_PtrOwner<Sky> sky_owner;

	RID sky_create();
	void sky_set_texture(RID p_sky, RID p_panorama, int p_radiance_size);

	/* VOXEL GI API */

	RID voxel_gi_allocate() override;
	void voxel_gi_initialize(RID p_rid) override;
	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) override;

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

	Vector<int> voxel_gi_get_level_counts(RID p_voxel_gi) const override;
	Transform3D voxel_gi_get_to_cell_xform(RID p_voxel_gi) const override;

	void voxel_gi_set_dynamic_range(RID p_voxel_gi, float p_range) override;
	float voxel_gi_get_dynamic_range(RID p_voxel_gi) const override;

	void voxel_gi_set_propagation(RID p_voxel_gi, float p_range) override;
	float voxel_gi_get_propagation(RID p_voxel_gi) const override;

	void voxel_gi_set_energy(RID p_voxel_gi, float p_range) override;
	float voxel_gi_get_energy(RID p_voxel_gi) const override;

	void voxel_gi_set_bias(RID p_voxel_gi, float p_range) override;
	float voxel_gi_get_bias(RID p_voxel_gi) const override;

	void voxel_gi_set_normal_bias(RID p_voxel_gi, float p_range) override;
	float voxel_gi_get_normal_bias(RID p_voxel_gi) const override;

	void voxel_gi_set_interior(RID p_voxel_gi, bool p_enable) override;
	bool voxel_gi_is_interior(RID p_voxel_gi) const override;

	void voxel_gi_set_use_two_bounces(RID p_voxel_gi, bool p_enable) override;
	bool voxel_gi_is_using_two_bounces(RID p_voxel_gi) const override;

	void voxel_gi_set_anisotropy_strength(RID p_voxel_gi, float p_strength) override;
	float voxel_gi_get_anisotropy_strength(RID p_voxel_gi) const override;

	uint32_t voxel_gi_get_version(RID p_voxel_gi) override;

	/* OCCLUDER */

	void occluder_set_mesh(RID p_occluder, const PackedVector3Array &p_vertices, const PackedInt32Array &p_indices);

	/* FOG VOLUMES */

	RID fog_volume_allocate() override;
	void fog_volume_initialize(RID p_rid) override;

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

	/* VISIBILITY NOTIFIER */
	RID visibility_notifier_allocate() override;
	void visibility_notifier_initialize(RID p_notifier) override;
	void visibility_notifier_set_aabb(RID p_notifier, const AABB &p_aabb) override;
	void visibility_notifier_set_callbacks(RID p_notifier, const Callable &p_enter_callbable, const Callable &p_exit_callable) override;

	AABB visibility_notifier_get_aabb(RID p_notifier) const override;
	void visibility_notifier_call(RID p_notifier, bool p_enter, bool p_deferred) override;

	// access from canvas
	//	GLES3::RenderTarget * render_target_get(RID p_render_target);

	/* CANVAS SHADOW */

	struct CanvasLightShadow {
		RID self;
		int size;
		int height;
		GLuint fbo;
		GLuint depth;
		GLuint distance; //for older devices
	};

	RID_PtrOwner<CanvasLightShadow> canvas_light_shadow_owner;

	RID canvas_light_shadow_buffer_create(int p_width);

	/* LIGHT SHADOW MAPPING */
	/*
	struct CanvasOccluder {
		RID self;

		GLuint vertex_id; // 0 means, unconfigured
		GLuint index_id; // 0 means, unconfigured
		LocalVector<Vector2> lines;
		int len;
	};

	RID_Owner<CanvasOccluder> canvas_occluder_owner;

	RID canvas_light_occluder_create();
	void canvas_light_occluder_set_polylines(RID p_occluder, const LocalVector<Vector2> &p_lines);
*/

	RS::InstanceType get_base_type(RID p_rid) const override;

	bool free(RID p_rid) override;

	void initialize();
	void finalize();

	void _copy_screen();

	void update_memory_info() override;
	uint64_t get_rendering_info(RS::RenderingInfo p_info) override;

	bool has_os_feature(const String &p_feature) const override;

	void update_dirty_resources() override;

	void set_debug_generate_wireframes(bool p_generate) override;

	//	void render_info_begin_capture() override;
	//	void render_info_end_capture() override;
	//	int get_captured_render_info(RS::RenderInfo p_info) override;

	//	int get_render_info(RS::RenderInfo p_info) override;
	String get_video_adapter_name() const override;
	String get_video_adapter_vendor() const override;
	RenderingDevice::DeviceType get_video_adapter_type() const override;

	void capture_timestamps_begin() override {}
	void capture_timestamp(const String &p_name) override {}
	uint32_t get_captured_timestamps_count() const override {
		return 0;
	}
	uint64_t get_captured_timestamps_frame() const override {
		return 0;
	}
	uint64_t get_captured_timestamp_gpu_time(uint32_t p_index) const override {
		return 0;
	}
	uint64_t get_captured_timestamp_cpu_time(uint32_t p_index) const override {
		return 0;
	}
	String get_captured_timestamp_name(uint32_t p_index) const override {
		return String();
	}

	void buffer_orphan_and_upload(unsigned int p_buffer_size, unsigned int p_offset, unsigned int p_data_size, const void *p_data, GLenum p_target = GL_ARRAY_BUFFER, GLenum p_usage = GL_DYNAMIC_DRAW, bool p_optional_orphan = false) const;
	bool safe_buffer_sub_data(unsigned int p_total_buffer_size, GLenum p_target, unsigned int p_offset, unsigned int p_data_size, const void *p_data, unsigned int &r_offset_after) const;

	RasterizerStorageGLES3();
	~RasterizerStorageGLES3();
};

inline bool RasterizerStorageGLES3::safe_buffer_sub_data(unsigned int p_total_buffer_size, GLenum p_target, unsigned int p_offset, unsigned int p_data_size, const void *p_data, unsigned int &r_offset_after) const {
	r_offset_after = p_offset + p_data_size;
#ifdef DEBUG_ENABLED
	// we are trying to write across the edge of the buffer
	if (r_offset_after > p_total_buffer_size) {
		return false;
	}
#endif
	glBufferSubData(p_target, p_offset, p_data_size, p_data);
	return true;
}

// standardize the orphan / upload in one place so it can be changed per platform as necessary, and avoid future
// bugs causing pipeline stalls
inline void RasterizerStorageGLES3::buffer_orphan_and_upload(unsigned int p_buffer_size, unsigned int p_offset, unsigned int p_data_size, const void *p_data, GLenum p_target, GLenum p_usage, bool p_optional_orphan) const {
	// Orphan the buffer to avoid CPU/GPU sync points caused by glBufferSubData
	// Was previously #ifndef GLES_OVER_GL however this causes stalls on desktop mac also (and possibly other)
	if (!p_optional_orphan || (config->should_orphan)) {
		glBufferData(p_target, p_buffer_size, nullptr, p_usage);
#ifdef RASTERIZER_EXTRA_CHECKS
		// fill with garbage off the end of the array
		if (p_buffer_size) {
			unsigned int start = p_offset + p_data_size;
			unsigned int end = start + 1024;
			if (end < p_buffer_size) {
				uint8_t *garbage = (uint8_t *)alloca(1024);
				for (int n = 0; n < 1024; n++) {
					garbage[n] = Math::random(0, 255);
				}
				glBufferSubData(p_target, start, 1024, garbage);
			}
		}
#endif
	}
	glBufferSubData(p_target, p_offset, p_data_size, p_data);
}

#endif // GLES3_ENABLED

#endif // RASTERIZER_STORAGE_OPENGL_H