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++ // Copyright (C) 2017 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
++
++ #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;
++ }