CameraUtils.hpp

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#pragma once
 
#define GLM_ENABLE_EXPERIMENTAL
 
#include <glm/glm.hpp>
#include <glm/gtc/quaternion.hpp>
#include <glm/gtx/quaternion.hpp>
 
namespace CameraMovement::Utils {

inline glm::quat ComputeLookAtQuaternion(const glm::vec3 &eye, const glm::vec3 &target, const glm::vec3 &up)
{
    glm::vec3 direction = glm::normalize(target - eye);
    glm::vec3 right = glm::normalize(glm::cross(up, direction));
    glm::vec3 newUp = glm::cross(direction, right);
 
    glm::mat3 rotationMatrix;
    rotationMatrix[0] = right;
    rotationMatrix[1] = newUp;
    rotationMatrix[2] = direction;
 
    return glm::quat_cast(rotationMatrix);
}

inline glm::quat RotateQuaternion(const glm::quat &current, float pitch, float yaw)
{
    glm::quat pitchQuat = glm::angleAxis(pitch, glm::vec3(1.0f, 0.0f, 0.0f));
    glm::quat yawQuat = glm::angleAxis(yaw, glm::vec3(0.0f, 1.0f, 0.0f));
 
    return glm::normalize(yawQuat * current * pitchQuat);
}

inline glm::vec3 GetRightVector(const glm::quat &rotation)
{
    return glm::normalize(rotation * glm::vec3(1.0f, 0.0f, 0.0f));
}

inline glm::vec3 GetUpVector(const glm::quat &rotation)
{
    return glm::normalize(rotation * glm::vec3(0.0f, 1.0f, 0.0f));
}

inline glm::vec3 GetForwardVector(const glm::quat &rotation)
{
    return glm::normalize(rotation * glm::vec3(0.0f, 0.0f, 1.0f));
}
 
} // namespace CameraMovement::Utils