#ifndef RASTERIZER_EFFECTS_RD_H
#define RASTERIZER_EFFECTS_RD_H

#include "core/math/camera_matrix.h"
#include "render_pipeline_vertex_format_cache_rd.h"
#include "servers/visual/rasterizer_rd/shaders/blur.glsl.gen.h"
#include "servers/visual/rasterizer_rd/shaders/copy.glsl.gen.h"
#include "servers/visual/rasterizer_rd/shaders/cubemap_roughness.glsl.gen.h"
#include "servers/visual/rasterizer_rd/shaders/sky.glsl.gen.h"
#include "servers/visual/rasterizer_rd/shaders/tonemap.glsl.gen.h"
#include "servers/visual_server.h"

class RasterizerEffectsRD {

	enum BlurMode {
		BLUR_MODE_GAUSSIAN_BLUR,
		BLUR_MODE_GAUSSIAN_GLOW,
		BLUR_MODE_GAUSSIAN_GLOW_AUTO_EXPOSURE,
		BLUR_MODE_DOF_NEAR_LOW,
		BLUR_MODE_DOF_NEAR_MEDIUM,
		BLUR_MODE_DOF_NEAR_HIGH,
		BLUR_MODE_DOF_NEAR_MERGE_LOW,
		BLUR_MODE_DOF_NEAR_MERGE_MEDIUM,
		BLUR_MODE_DOF_NEAR_MERGE_HIGH,
		BLUR_MODE_DOF_FAR_LOW,
		BLUR_MODE_DOF_FAR_MEDIUM,
		BLUR_MODE_DOF_FAR_HIGH,
		BLUR_MODE_SSAO_MERGE,
		BLUR_MODE_SIMPLY_COPY,
		BLUR_MODE_MIPMAP,
		BLUR_MODE_MAX,

	};

	enum {
		BLUR_FLAG_HORIZONTAL = (1 << 0),
		BLUR_FLAG_USE_BLUR_SECTION = (1 << 1),
		BLUR_FLAG_USE_ORTHOGONAL_PROJECTION = (1 << 2),
		BLUR_FLAG_DOF_NEAR_FIRST_TAP = (1 << 3),
		BLUR_FLAG_GLOW_FIRST_PASS = (1 << 4),
		BLUR_FLAG_FLIP_Y = (1 << 5)
	};

	struct BlurPushConstant {
		float section[4];
		float pixel_size[2];
		uint32_t flags;
		uint32_t pad;
		//glow
		float glow_strength;
		float glow_bloom;
		float glow_hdr_threshold;
		float glow_hdr_scale;
		float glow_exposure;
		float glow_white;
		float glow_luminance_cap;
		float glow_auto_exposure_grey;
		//dof
		float dof_begin;
		float dof_end;
		float dof_radius;
		float dof_pad;

		float dof_dir[2];
		float camera_z_far;
		float camera_z_near;

		float ssao_color[4];
	};

	struct Blur {
		BlurPushConstant push_constant;
		BlurShaderRD shader;
		RID shader_version;
		RenderPipelineVertexFormatCacheRD pipelines[BLUR_MODE_MAX];

	} blur;

	enum CubemapRoughnessSource {
		CUBEMAP_ROUGHNESS_SOURCE_PANORAMA,
		CUBEMAP_ROUGHNESS_SOURCE_CUBEMAP,
		CUBEMAP_ROUGHNESS_SOURCE_MAX
	};

	struct CubemapRoughnessPushConstant {
		uint32_t face_id;
		uint32_t sample_count;
		float roughness;
		uint32_t use_direct_write;
	};

	struct CubemapRoughness {

		CubemapRoughnessPushConstant push_constant;
		CubemapRoughnessShaderRD shader;
		RID shader_version;
		RenderPipelineVertexFormatCacheRD pipelines[CUBEMAP_ROUGHNESS_SOURCE_MAX];
	} roughness;

	struct SkyPushConstant {
		float orientation[12];
		float proj[4];
		float multiplier;
		float alpha;
		float depth;
		float pad;
	};

	struct Sky {

		SkyPushConstant push_constant;
		SkyShaderRD shader;
		RID shader_version;
		RenderPipelineVertexFormatCacheRD pipeline;
	} sky;

	enum TonemapMode {
		TONEMAP_MODE_NORMAL,
		TONEMAP_MODE_BICUBIC_GLOW_FILTER,
		TONEMAP_MODE_MAX
	};

	struct TonemapPushConstant {
		float bcs[3];
		uint32_t use_bcs;

		uint32_t use_glow;
		uint32_t use_auto_exposure;
		uint32_t use_color_correction;
		uint32_t tonemapper;

		uint32_t glow_texture_size[2];

		float glow_intensity;
		uint32_t glow_level_flags;
		uint32_t glow_mode;

		float exposure;
		float white;
		float auto_exposure_grey;
	};

	struct Tonemap {

		TonemapPushConstant push_constant;
		TonemapShaderRD shader;
		RID shader_version;
		RenderPipelineVertexFormatCacheRD pipelines[TONEMAP_MODE_MAX];
	} tonemap;

	struct CopyToDPPushConstant {
		float bias;
		float z_far;
		float z_near;
		uint32_t z_flip;
	};

	enum CopyMode {
		COPY_MODE_CUBE_TO_DP,
		COPY_MODE_MAX
	};

	struct Copy {

		CopyShaderRD shader;
		RID shader_version;
		RenderPipelineVertexFormatCacheRD pipelines[COPY_MODE_MAX];
	} copy;

	RID default_sampler;
	RID index_buffer;
	RID index_array;

	Map<RID, RID> texture_to_uniform_set_cache;

	RID _get_uniform_set_from_texture(RID p_texture);

public:
	void region_copy(RID p_source_rd_texture, RID p_dest_framebuffer, const Rect2 &p_region);
	void copy_to_rect(RID p_source_rd_texture, RID p_dest_framebuffer, const Rect2 &p_rect, bool p_flip_y = false);
	void gaussian_blur(RID p_source_rd_texture, RID p_framebuffer_half, RID p_rd_texture_half, RID p_dest_framebuffer, const Vector2 &p_pixel_size, const Rect2 &p_region);
	void cubemap_roughness(RID p_source_rd_texture, bool p_source_is_panorama, RID p_dest_framebuffer, uint32_t p_face_id, uint32_t p_sample_count, float p_roughness);
	void render_panorama(RD::DrawListID p_list, RenderingDevice::FramebufferFormatID p_fb_format, RID p_panorama, const CameraMatrix &p_camera, const Basis &p_orientation, float p_alpha, float p_multipler);
	void make_mipmap(RID p_source_rd_texture, RID p_framebuffer_half, const Vector2 &p_pixel_size);
	void copy_cubemap_to_dp(RID p_source_rd_texture, RID p_dest_framebuffer, const Rect2 &p_rect, float p_z_near, float p_z_far, float p_bias, bool p_dp_flip);

	struct TonemapSettings {

		bool use_glow = false;
		enum GlowMode {
			GLOW_MODE_ADD,
			GLOW_MODE_SCREEN,
			GLOW_MODE_SOFTLIGHT,
			GLOW_MODE_REPLACE
		};

		GlowMode glow_mode = GLOW_MODE_ADD;
		float glow_intensity = 1.0;
		uint32_t glow_level_flags = 0;
		Vector2i glow_texture_size;
		bool glow_use_bicubic_upscale = false;
		RID glow_texture;

		VS::EnvironmentToneMapper tonemap_mode = VS::ENV_TONE_MAPPER_LINEAR;
		float exposure = 1.0;
		float white = 1.0;

		bool use_auto_exposure = false;
		float auto_exposure_grey = 0.5;
		RID exposure_texture;

		bool use_bcs = false;
		float brightness = 1.0;
		float contrast = 1.0;
		float saturation = 1.0;

		bool use_color_correction = false;
		RID color_correction_texture;
	};

	void tonemapper(RID p_source_color, RID p_dst_framebuffer, const TonemapSettings &p_settings);

	RasterizerEffectsRD();
	~RasterizerEffectsRD();
};

#endif // EFFECTS_RD_H