camera.cpp Example File | Qt GUI 5.12.11

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# camera.cpp Example File

hellovulkancubes/camera.cpp

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     #include "camera.h"

     Camera::Camera(const QVector3D &pos)
         : m_forward(0.0f, 0.0f, -1.0f),
           m_right(1.0f, 0.0f, 0.0f),
           m_up(0.0f, 1.0f, 0.0f),
           m_pos(pos),
           m_yaw(0.0f),
           m_pitch(0.0f)
     {
     }

     static inline void clamp360(float *v)
     {
         if (*v > 360.0f)
             *v -= 360.0f;
         if (*v < -360.0f)
             *v += 360.0f;
     }

     void Camera::yaw(float degrees)
     {
         m_yaw += degrees;
         clamp360(&m_yaw);
         m_yawMatrix.setToIdentity();
         m_yawMatrix.rotate(m_yaw, 0, 1, 0);

         QMatrix4x4 rotMat = m_pitchMatrix * m_yawMatrix;
         m_forward = (QVector4D(0.0f, 0.0f, -1.0f, 0.0f) * rotMat).toVector3D();
         m_right = (QVector4D(1.0f, 0.0f, 0.0f, 0.0f) * rotMat).toVector3D();
     }

     void Camera::pitch(float degrees)
     {
         m_pitch += degrees;
         clamp360(&m_pitch);
         m_pitchMatrix.setToIdentity();
         m_pitchMatrix.rotate(m_pitch, 1, 0, 0);

         QMatrix4x4 rotMat = m_pitchMatrix * m_yawMatrix;
         m_forward = (QVector4D(0.0f, 0.0f, -1.0f, 0.0f) * rotMat).toVector3D();
         m_up = (QVector4D(0.0f, 1.0f, 0.0f, 0.0f) * rotMat).toVector3D();
     }

     void Camera::walk(float amount)
     {
         m_pos[0] += amount * m_forward.x();
         m_pos[2] += amount * m_forward.z();
     }

     void Camera::strafe(float amount)
     {
         m_pos[0] += amount * m_right.x();
         m_pos[2] += amount * m_right.z();
     }

     QMatrix4x4 Camera::viewMatrix() const
     {
         QMatrix4x4 m = m_pitchMatrix * m_yawMatrix;
         m.translate(-m_pos);
         return m;
     }