Tesseract-Engine/src/Components/Transform.cpp

// TransformComponent.cpp
#include "Transform.h"
#define GLM_ENABLE_EXPERIMENTAL
#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
#include <glm/gtc/quaternion.hpp>
#include <glm/gtx/quaternion.hpp>

const std::string TransformComponent::name = "Transform";

TransformComponent::TransformComponent()
    : position(0.0f), rotation(0.0f), scale(1.0f)
{
    position = glm::vec3(0.0f, 0.0f, 0.0f);
    rotation = glm::vec3(0.0f, 0.0f, 0.0f);
    scale = glm::vec3(1.0f, 1.0f, 1.0f);
}

const std::string &TransformComponent::GetName() const
{
    return name;
}

const std::string &TransformComponent::GetStaticName()
{
    return name;
}

void TransformComponent::Update(float _deltaTime)
{
    (void)_deltaTime; // Suppress unused parameter warning
    return;
}

// New Methods
glm::mat4 TransformComponent::GetTransformMatrix() const
{
    glm::mat4 translation = glm::translate(glm::mat4(1.0f), position);

    // Convert Euler angles (in degrees) to a quaternion and then to a rotation matrix
    glm::quat quatRotation = glm::quat(glm::radians(rotation));
    glm::mat4 rotationMatrix = glm::toMat4(quatRotation);

    glm::mat4 scaling = glm::scale(glm::mat4(1.0f), scale);

    // Note: The order is Scale -> Rotate -> Translate
    return translation * rotationMatrix * scaling;
}

void TransformComponent::SetTransformMatrix(const glm::mat4 &transform)
{
    // Extract translation
    position = glm::vec3(transform[3]);

    // Extract scale factors
    scale.x = glm::length(glm::vec3(transform[0]));
    scale.y = glm::length(glm::vec3(transform[1]));
    scale.z = glm::length(glm::vec3(transform[2]));

    // Remove scale from rotation matrix
    glm::mat4 rotationMatrix = transform;
    rotationMatrix[0] /= scale.x;
    rotationMatrix[1] /= scale.y;
    rotationMatrix[2] /= scale.z;

    // Convert rotation matrix to quaternion and then to Euler angles (in degrees)
    glm::quat quatRotation = glm::quat_cast(rotationMatrix);
    glm::vec3 euler = glm::degrees(glm::eulerAngles(quatRotation));
    rotation = euler;
}

YAML::Node TransformComponent::Serialize()
{
    YAML::Node node;

    // Position
    {
        YAML::Node posNode;
        posNode.SetStyle(YAML::EmitterStyle::Flow);
        posNode.push_back(position.x);
        posNode.push_back(position.y);
        posNode.push_back(position.z);
        node["Position"] = posNode;
    }

    // Rotation
    {
        YAML::Node rotNode;
        rotNode.SetStyle(YAML::EmitterStyle::Flow);
        rotNode.push_back(rotation.x);
        rotNode.push_back(rotation.y);
        rotNode.push_back(rotation.z);
        node["Rotation"] = rotNode;
    }

    // Scale
    {
        YAML::Node scaleNode;
        scaleNode.SetStyle(YAML::EmitterStyle::Flow);
        scaleNode.push_back(scale.x);
        scaleNode.push_back(scale.y);
        scaleNode.push_back(scale.z);
        node["Scale"] = scaleNode;
    }

    return node;
}

void TransformComponent::Deserialize(const YAML::Node &node)
{
    if (node["Position"])
    {
        auto pos = node["Position"].as<std::vector<float>>();
        if (pos.size() == 3)
            position = glm::vec3(pos[0], pos[1], pos[2]);
    }
    if (node["Rotation"])
    {
        auto rot = node["Rotation"].as<std::vector<float>>();
        if (rot.size() == 3)
            rotation = glm::vec3(rot[0], rot[1], rot[2]);
    }
    if (node["Scale"])
    {
        auto scl = node["Scale"].as<std::vector<float>>();
        if (scl.size() == 3)
            scale = glm::vec3(scl[0], scl[1], scl[2]);
    }
}