// Version:    <1.0>

//

// Disclaimer: IMPORTANT:  This Apple software is supplied to you by Apple Inc. ("Apple")

//             in consideration of your agreement to the following terms, and your use,

//             installation, modification or redistribution of this Apple software

//             constitutes acceptance of these terms.  If you do not agree with these

//             terms, please do not use, install, modify or redistribute this Apple

//             software.

//

//             In consideration of your agreement to abide by the following terms, and

//             subject to these terms, Apple grants you a personal, non - exclusive

//             license, under Apple's copyrights in this original Apple software ( the

//             "Apple Software" ), to use, reproduce, modify and redistribute the Apple

//             Software, with or without modifications, in source and / or binary forms;

//             provided that if you redistribute the Apple Software in its entirety and

//             without modifications, you must retain this notice and the following text

//             and disclaimers in all such redistributions of the Apple Software. Neither

//             the name, trademarks, service marks or logos of Apple Inc. may be used to

//             endorse or promote products derived from the Apple Software without specific

//             prior written permission from Apple.  Except as expressly stated in this

//             notice, no other rights or licenses, express or implied, are granted by

//             Apple herein, including but not limited to any patent rights that may be

//             infringed by your derivative works or by other works in which the Apple

//             Software may be incorporated.

//

//             The Apple Software is provided by Apple on an "AS IS" basis.  APPLE MAKES NO

//             WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION THE IMPLIED

//             WARRANTIES OF NON - INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A

//             PARTICULAR PURPOSE, REGARDING THE APPLE SOFTWARE OR ITS USE AND OPERATION

//             ALONE OR IN COMBINATION WITH YOUR PRODUCTS.

//

//             IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL OR

//             CONSEQUENTIAL DAMAGES ( INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

//             SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS

//             INTERRUPTION ) ARISING IN ANY WAY OUT OF THE USE, REPRODUCTION, MODIFICATION

//             AND / OR DISTRIBUTION OF THE APPLE SOFTWARE, HOWEVER CAUSED AND WHETHER

//             UNDER THEORY OF CONTRACT, TORT ( INCLUDING NEGLIGENCE ), STRICT LIABILITY OR

//             OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

//

// Copyright ( C ) 2008 Apple Inc. All Rights Reserved.

//

////////////////////////////////////////////////////////////////////////////////////////////////////

#ifndef __CAMERA__

#define __CAMERA__

#include "compute_types.h"

#include "compute_math.h"

////////////////////////////////////////////////////////////////////////////////

class Camera

{

public:

    Camera();

    Camera( const Camera& rkOther );

    ~Camera();

    void enable();

    void disable();

    void update(bool bOrbit = false);

    void orbit(float fDX, float fDY);

    void yaw(float fStep);

    void pitch(float fStep);

    void roll(float fStep);

    void strafe(float fStep);

    void forward(float fStep);

    void elevate(float fStep);

    void drawFrustum();

public:

    void setDebug(bool bV)                          { m_bDebug = bV;                }

    void setInertia(float fV)                       { m_fInertia = fV;              }

    void setYaw(float fV)                           { m_fYaw = fV;                  }

    void setPitch(float fV)                         { m_fPitch = fV;                }

    void setRoll(float fV)                          { m_fRoll = fV;                 }

    void setZoom(float fV)                          { m_fZoom = fV;                 }

    void setFovInDegrees(float fV)                  { m_fFovY = fV; 

                                                      m_fFovX = m_fAspect * m_fFovY;}

    void setAspect(float fV)                        { m_fAspect = fV; 

                                                      m_fFovX = m_fAspect * m_fFovY;}    

    void setNearClip(float fV)                      { m_fNearClip = fV;             }

    void setFarClip(float fV)                       { m_fFarClip = fV;              }

    void setViewport(uint uiW, uint uiH)            { m_uiViewportWidth = uiW; 

                                                      m_uiViewportHeight = uiH;     }

    void setPosition(float3 fV)                     { m_kPosition = fV; m_kPositionLag = fV; }

    void setRotation(float3 fV)                     { m_kRotation = fV; m_kRotationLag = fV; 

                                                      m_fPitch = fV.x; m_fYaw = fV.y; m_fRoll = fV.z; }

    void setFrame(float3 fUp, float3 fView, float3 fLeft)  

                                                    { m_kUp = fUp;

                                                      m_kLeft = fLeft;

                                                      m_kView = fView;              }

    bool getDebug() const                           { return m_bDebug;              }

    float getInertia() const                        { return m_fInertia;            }

    float getYaw()const                             { return m_fYaw;                }

    float getPitch()const                           { return m_fPitch;              }

    float getRoll() const                           { return m_fRoll;               }

    float getZoom() const                           { return m_fZoom;               }

    float getFovInDegrees() const                   { return m_fFovY;               }

    float getAspect() const                         { return m_fAspect;             }

    float getNearClip() const                       { return m_fNearClip;           }

    float getFarClip() const                        { return m_fFarClip;            }

    uint getViewportWidth() const                   { return m_uiViewportWidth;     }

    uint getViewportHeight() const                  { return m_uiViewportHeight;    }

    const float3& getPosition() const               { return m_kPositionLag;        }

    const float3& getRotation() const               { return m_kRotationLag;        }

    const float3& getUpDirection() const            { return m_kUp;                 }

    const float3& getLeftDirection() const          { return m_kLeft;               }

    const float3& getViewDirection() const          { return m_kView;               }

    const float16& getProjectionMatrix() const      { return m_kProjectionMatrix;   }

    const float16& getActualModelViewMatrix() const { return m_kActualModelViewMatrix; }

    const float16& getModelViewMatrix() const       { return m_kModelViewMatrix;    }

    const float16& getInverseModelViewMatrix() const           { return m_kInverseModelViewMatrix;    }

    const float16& getModelViewProjectionMatrix() const        { return m_kModelViewProjectionMatrix; }

    const float16& getInverseModelViewProjectionMatrix() const { return m_kInverseModelViewProjectionMatrix; }

protected:

    void updateProjectionMatrix();

    void updateModelViewMatrix(bool bOrbit);

protected:

    bool m_bDebug;

    float m_fInertia;

    float m_fYaw;

    float m_fPitch;

    float m_fRoll;

    float3 m_kRotation;

    float3 m_kRotationLag;

    float m_fZoom;

    float m_fFovX;

    float m_fFovY;

    float m_fAspect;

    float m_fNearClip;

    float m_fFarClip;

    uint m_uiViewportWidth;

    uint m_uiViewportHeight;

    float3 m_kPosition;

    float3 m_kPositionLag;

    float3 m_kUp;

    float3 m_kLeft;

    float3 m_kView;

    float3 m_kUpAxis;

    float3 m_kLeftAxis;

    float3 m_kViewAxis;

    float16 m_kProjectionMatrix;

    float16 m_kModelViewMatrix;

    float16 m_kInverseModelViewMatrix;

    float16 m_kActualModelViewMatrix;

    float16 m_kModelViewProjectionMatrix;

    float16 m_kInverseModelViewProjectionMatrix;

};

////////////////////////////////////////////////////////////////////////////////

#endif