///////////////////////////////////////////////////////////////////////////
//
// Copyright (c) 2012-2018 DreamWorks Animation LLC
//
// All rights reserved. This software is distributed under the
// Mozilla Public License 2.0 ( http://www.mozilla.org/MPL/2.0/ )
//
// Redistributions of source code must retain the above copyright
// and license notice and the following restrictions and disclaimer.
//
// *     Neither the name of DreamWorks Animation nor the names of
// its contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// IN NO EVENT SHALL THE COPYRIGHT HOLDERS' AND CONTRIBUTORS' AGGREGATE
// LIABILITY FOR ALL CLAIMS REGARDLESS OF THEIR BASIS EXCEED US$250.00.
//
///////////////////////////////////////////////////////////////////////////
//
/// @file Camera.h
/// @brief Basic GL camera class

#ifndef OPENVDB_VIEWER_CAMERA_HAS_BEEN_INCLUDED
#define OPENVDB_VIEWER_CAMERA_HAS_BEEN_INCLUDED

#include <openvdb/Types.h>

#ifdef OPENVDB_USE_GLFW_3
struct GLFWwindow; // forward declaration
#endif


namespace openvdb_viewer {

class Camera
{
public:
    Camera();

#ifdef OPENVDB_USE_GLFW_3
    void setWindow(GLFWwindow* w) { mWindow = w; }
#endif

    void aim();

    void lookAt(const openvdb::Vec3d& p, double dist = 1.0);
    void lookAtTarget();

    void setTarget(const openvdb::Vec3d& p, double dist = 1.0);

    void setNearFarPlanes(double n, double f) { mNearPlane = n; mFarPlane = f; }
    void setFieldOfView(double degrees) { mFov = degrees; }
    void setSpeed(double zoomSpeed = 0.1, double strafeSpeed = 0.002, double tumblingSpeed = 0.02);

    void keyCallback(int key, int action);
    void mouseButtonCallback(int button, int action);
    void mousePosCallback(int x, int y);
    void mouseWheelCallback(int pos, int prevPos);

    bool needsDisplay() const { return mNeedsDisplay; }

private:
    // Camera parameters
    double mFov, mNearPlane, mFarPlane;
    openvdb::Vec3d mTarget, mLookAt, mUp, mForward, mRight, mEye;
    double mTumblingSpeed, mZoomSpeed, mStrafeSpeed;
    double mHead, mPitch, mTargetDistance, mDistance;

    // Input states
    bool mMouseDown, mStartTumbling, mZoomMode, mChanged, mNeedsDisplay;
    double mMouseXPos, mMouseYPos;

#ifdef OPENVDB_USE_GLFW_3
    GLFWwindow* mWindow;
#endif

    static const double sDeg2rad;
}; // class Camera

} // namespace openvdb_viewer

#endif // OPENVDB_VIEWER_CAMERA_HAS_BEEN_INCLUDED

// Copyright (c) 2012-2018 DreamWorks Animation LLC
// All rights reserved. This software is distributed under the
// Mozilla Public License 2.0 ( http://www.mozilla.org/MPL/2.0/ )
