#pragma once

#include "scene_node.h"
#include "texture.h"

BEGIN_NAMESPACE

// http://en.wikipedia.org/wiki/Shading#Lighting
enum class light_type {
    directional,
    point,
    spot
};

struct light_node : scene_node {
    explicit light_node(light_type type);

    void calculate_local_transform() override;

    light_type light_type_;

    glm::vec4 ambient = glm::vec4(0.2, 0.2, 0.2, 1);
    glm::vec4 diffuse = glm::vec4(0.5, 0.5, 0.5, 1);
    glm::vec4 specular = glm::vec4(1);

    glm::vec3 attenuation;

    glm::vec3 spot_target;
    float spot_cutoff;
    float spot_exponent;

    bool active = true;

    int shadow_map_width = 1024;
    glm::mat4 light_projection_matrix[6];
    glm::mat4 world_to_light_matrix[6];
    glm::mat4 shadow_map_bias_matrix;
    glm::mat4 final_shadow_map_matrix[6];
    std::shared_ptr<texture> shadow_map[6];
};

END_NAMESPACE