SpotLightComponent.hpp

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#pragma once
 
#include <iostream>
#include <string>
 
#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
 
namespace shkyera {
 
struct SpotLightComponent {
 public:
  float intensity = 1;
  float range = 5;
  float innerCutoff = glm::radians(15.0f);
  float outerCutoff = glm::radians(25.0f);
  glm::vec3 color = {1, 1, 1};
 
  glm::mat4 getLightSpaceMatrix(const glm::mat4& transformMatrix) const {
    const auto lightPosition = glm::vec3{transformMatrix[3]};
    const auto projection = glm::perspective(2 * outerCutoff, 1.0f, 0.01f, range);
    const auto lightDirection = glm::normalize(glm::vec3{1, 0, 0} * glm::mat3{glm::inverse(transformMatrix)});
    const auto lightSpaceMatrix =
        projection * glm::lookAt(lightPosition, lightPosition + lightDirection, glm::vec3{0, 1, 0});
    return lightSpaceMatrix;
  }
};
 
}  // namespace shkyera