/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#pragma once
#include "Float3d.h"

class gl_shader
{
	GLuint id;
public:
	gl_shader();
	gl_shader(std::string);

	operator GLuint();
};

class gl_program
{
protected:
	GLuint id;
public:
	gl_program() = default;
	gl_program(std::vector<gl_shader>);

	static gl_program* current_program;
	static gl_program* last_program;
	void bind();
	static void bind_last();
	static void unbind();

	operator GLuint();
};

class gl_program_mvp : public gl_program
{
	GLuint mv_uniform;
	GLint mvn_uniform;
	GLuint p_uniform;

public:
	gl_program_mvp() = default;
	gl_program_mvp(std::vector<gl_shader>);

	void set_mv(const glm::mat4 &);
	void set_p(const glm::mat4 &);
	void copy_gl_mvp();
};

class gl_program_light : public gl_program_mvp
{
public:
	static const size_t MAX_LIGHTS = 8;

	enum type
	{
		SPOT = 0,
		POINT,
		DIR
	};

	gl_program_light() = default;
	gl_program_light(std::vector<gl_shader>);

	void set_lightview(glm::mat4 &lightview);
	void set_ambient(glm::vec3 &ambient);
	void gl_program_light::set_fog(float density, glm::vec3 &color);
	void set_material(float specular, glm::vec3 &emission);
	void set_light_count(GLuint count);
	void set_light(GLuint id, type t, glm::vec3 &pos, glm::vec3 &dir, float in_cutoff, float out_cutoff,
		glm::vec3 &color, float linear, float quadratic);

private:
	GLuint lightview_uniform;
	GLuint ambient_uniform;
	GLuint specular_uniform;
	GLuint fog_color_uniform;
	GLuint fog_density_uniform;
	GLuint emission_uniform;
	GLuint lcount_uniform;
	struct light_s
	{
		GLuint type;
		GLuint pos;
		GLuint dir;
		GLuint in_cutoff;
		GLuint out_cutoff;
		GLuint color;
		GLuint linear;
		GLuint quadratic;
	} lights_uniform[MAX_LIGHTS];
};