transform_component.hpp

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#pragma once
 
#define GLM_ENABLE_EXPERIMENTAL
 
#include "glm/ext/quaternion_transform.hpp"
#include <glm/mat4x4.hpp>
#include <glm/vec3.hpp>
#include <glm/gtx/quaternion.hpp>
 
namespace solarsim {
    struct TransformComponent {
        glm::vec3 position{0.0f};

        glm::quat rotation{1.0f, 0.0f, 0.0f, 0.0f};

        glm::vec3 scale{1.0f};

        mutable glm::mat4 modelMatrix;

        mutable bool dirty = true;

        glm::mat4 getModelMatrix() const {
            if (dirty) {
                modelMatrix = 
                    glm::translate(glm::mat4(1.0f), position) * 
                    glm::toMat4(rotation) * 
                    glm::scale(glm::mat4(1.0f), scale);
                dirty = false;
            }
            return modelMatrix;
        }
    };
}