phong_shader.h

#pragma once
#include "shader.h"

// Portions lifted from OpenGL SuperBible 7th Edition.

class PhongShader : public Shader
{
public:
	void Use(glm::mat4 &model_matrix, glm::mat4 &view_matrix, glm::mat4 &projection_matrix);
	void UnUse();
	void SetMaterial(glm::vec3 diffuse_albedo, glm::vec3 specular_albedo, float specular_power, glm::vec3 ambient);
	void SetParameters(float p1 , float p2);
	void SetLightPosition(glm::vec3 light_position);
	void SelectSubroutine(int subroutine_index);
	void CustomSetup();
	void SetGlobalTime(float global_time);
	void EnableTexture(ILContainer & ilcontainer , GLuint texture_unit);
	void SetOpacity(float opacity);

	enum SubroutineIndices
	{
		CONSTANT,
		BASIC_PHONG,
		PHONG_WITH_TEXTURE,
		SHADER_TOY_1,
		NUMBER_OF_SUBROUTINES
	};


private:

	struct
	{
		GLuint modelview_matrix;
		GLuint view_matrix;
		GLuint normal_matrix;
		GLuint projection_matrix;
		GLuint diffuse_albedo;
		GLuint specular_albedo;
		GLuint specular_power;
		GLuint ambient;
		GLuint light_position;
		GLuint base_texture_location;
		GLuint global_time;
		GLuint opacity;
		GLuint param1;
		GLuint param2;
	} uniforms;

	std::vector<GLuint> subroutine_indices;
};