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// Copyright Contributors to the OpenVDB Project
// SPDX-License-Identifier: MPL-2.0
//
/// @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>
struct GLFWwindow; // forward declaration
namespace openvdb_viewer {
class Camera
{
public:
Camera();
void setWindow(GLFWwindow* w) { mWindow = w; }
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;
GLFWwindow* mWindow;
static const double sDeg2rad;
}; // class Camera
} // namespace openvdb_viewer
#endif // OPENVDB_VIEWER_CAMERA_HAS_BEEN_INCLUDED
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