/*
 * Modern effects for a modern Streamer
 * Copyright (C) 2017-2018 Michael Fabian Dirks
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 */

#ifndef OBS_STREAM_EFFECTS_FILTER_SHADOW_SDF_HPP
#define OBS_STREAM_EFFECTS_FILTER_SHADOW_SDF_HPP
#pragma once

#include <memory>
#include "gs-effect.hpp"
#include "gs-rendertarget.hpp"
#include "gs-sampler.hpp"
#include "gs-texture.hpp"
#include "gs-vertexbuffer.hpp"
#include "plugin.hpp"

// OBS
#ifdef _MSC_VER
#pragma warning(push)
#pragma warning(disable : 4201)
#endif
#include <obs.h>
#ifdef _MSC_VER
#pragma warning(pop)
#endif

namespace filter {
	namespace shadow_sdf {
		class shadow_sdf_instance {
			obs_source_t*                     m_self;

			// Input
			std::shared_ptr<gs::rendertarget> m_source_rt;
			std::shared_ptr<gs::texture>      m_source_texture;
			bool                              m_source_rendered;

			// Distance Field
			std::shared_ptr<gs::rendertarget> m_sdf_write, m_sdf_read;
			std::shared_ptr<gs::texture>      m_sdf_texture;

			float_t m_tick      = 0.;

			bool     m_inner_shadow;
			float_t  m_inner_range_min;
			float_t  m_inner_range_max;
			float_t  m_inner_offset_x;
			float_t  m_inner_offset_y;
			uint32_t m_inner_color;
			bool     m_outer_shadow;
			float_t  m_outer_range_min;
			float_t  m_outer_range_max;
			float_t  m_outer_offset_x;
			float_t  m_outer_offset_y;
			uint32_t m_outer_color;

			static bool cb_modified_inside(void* ptr, obs_properties_t* props, obs_property* prop,
										   obs_data_t* settings);

			static bool cb_modified_outside(void* ptr, obs_properties_t* props, obs_property* prop,
											obs_data_t* settings);

			public:
			shadow_sdf_instance(obs_data_t* settings, obs_source_t* self);
			~shadow_sdf_instance();

			obs_properties_t* get_properties();
			void              update(obs_data_t*);

			uint32_t get_width();
			uint32_t get_height();

			void activate();
			void deactivate();

			void video_tick(float);
			void video_render(gs_effect_t*);
		};

		class shadow_sdf_factory {
			obs_source_info                 source_info;
			std::list<shadow_sdf_instance*> sources;

			std::shared_ptr<gs::effect> sdf_generator_effect;
			std::shared_ptr<gs::effect> sdf_shadow_effect;

			private:
			shadow_sdf_factory();
			~shadow_sdf_factory();

			void on_list_fill();
			void on_list_empty();

			protected:
			static void* create(obs_data_t* settings, obs_source_t* self);
			static void  destroy(void* source);

			static void              get_defaults(obs_data_t* settings);
			static obs_properties_t* get_properties(void* source);
			static void              update(void* source, obs_data_t* settings);

			static const char* get_name(void* source);
			static uint32_t    get_width(void* source);
			static uint32_t    get_height(void* source);

			static void activate(void* source);
			static void deactivate(void* source);

			static void video_tick(void* source, float delta);
			static void video_render(void* source, gs_effect_t* effect);

			public:
			std::shared_ptr<gs::effect> get_sdf_generator_effect();
			std::shared_ptr<gs::effect> get_sdf_shadow_effect();

			public: // Singleton
			static void                initialize();
			static void                finalize();
			static shadow_sdf_factory* get();
		};
	} // namespace shadow_sdf
} // namespace filter

#endif