OpenMW/libs/openengine/ogre/mouselook.cpp

#include "mouselook.hpp"

#include <OIS/OIS.h>
#include <OgreCamera.h>
#include <OgreSceneNode.h>

using namespace OIS;
using namespace Ogre;
using namespace OEngine::Render;

void MouseLookEvent::event(Type type, int index, const void *p)
{
    if(type != EV_MouseMove || camera == NULL) return;

    MouseEvent *arg = (MouseEvent*)(p);

    float x = arg->state.X.rel * sensX;
    float y = arg->state.Y.rel * sensY;

    camera->getParentSceneNode()->getParentSceneNode()->yaw(Degree(-x));
    camera->getParentSceneNode()->pitch(Degree(-y));
    if(flipProt)
    {
        // The camera before pitching
        /*Quaternion nopitch = camera->getParentSceneNode()->getOrientation();

          camera->getParentSceneNode()->pitch(Degree(-y));

        // Apply some failsafe measures against the camera flipping
        // upside down. Is the camera close to pointing straight up or
        // down?
        if(Ogre::Vector3(camera->getParentSceneNode()->getOrientation()*Ogre::Vector3::UNIT_Y)[1] <= 0.1)
        // If so, undo the last pitch
        camera->getParentSceneNode()->setOrientation(nopitch);*/
        //camera->getU

        // Angle of rotation around the X-axis.
        float pitchAngle = (2 * Ogre::Degree(Ogre::Math::ACos(camera->getParentSceneNode()->getOrientation().w)).valueDegrees());

        // Just to determine the sign of the angle we pick up above, the
        // value itself does not interest us.
        float pitchAngleSign = camera->getParentSceneNode()->getOrientation().x;

        // Limit the pitch between -90 degress and +90 degrees, Quake3-style.
        if (pitchAngle > 90.0f)
        {
            if (pitchAngleSign > 0)
                // Set orientation to 90 degrees on X-axis.
                camera->getParentSceneNode()->setOrientation(Ogre::Quaternion(Ogre::Math::Sqrt(0.5f),
                            Ogre::Math::Sqrt(0.5f), 0, 0));
            else if (pitchAngleSign < 0)
                // Sets orientation to -90 degrees on X-axis.
                camera->getParentSceneNode()->setOrientation(Ogre::Quaternion(Ogre::Math::Sqrt(0.5f),
                            -Ogre::Math::Sqrt(0.5f), 0, 0));
        }
    }
}