#ifndef PHONGMATERIAL_H
#define PHONGMATERIAL_H

#include "material.h"
#include "glm/vec3.hpp"
#include <string>

class Texture;

struct PBRMaterial : public Material
{
    enum TextureSlots
    {
        ALBEDO_SLOT,
        EMISSION_SLOT,
        NORMALS_SLOT,
        ROUGHNESS_SLOT,
        METALLIC_SLOT,
        ALPHA_SLOT,
        NB_PBR_SLOTS
    };

    glm::vec3 emission;
    glm::vec3 albedo;
    float roughness;
    float metallic;
    float opacity;
    Texture* textures[NB_PBR_SLOTS];
    std::string textureNames[NB_PBR_SLOTS];

	PBRMaterial() :
        emission(0),
        albedo(0.9f),
        roughness(0.8f),
        metallic(0.2),
        opacity(1.f)
    {
        for(int i=0; i<NB_PBR_SLOTS; ++i)
            textures[i] = NULL;
    }

    void setTexture(TextureSlots slot, Texture* texture = NULL, const std::string &name = "")
        { textures[slot] = texture; textureNames[slot] = name; }

    virtual ~PBRMaterial() {}

    virtual void bindAttributes(Shader* myShader);
    
    virtual unsigned int getFlags();
};

#endif // PHONGMATERIAL_H