User input for camera control with a Byte

gistfile1.cpp

enum CamMoveStates
{
    CamMoveNone         = 0
    , CamMoveForward    = (1<<0)
    , CamMoveBackwards  = (1<<1)
    , CamMoveLeft       = (1<<2)
    , CamMoveRight      = (1<<3)
    , CamMoveUp         = (1<<4)
    , CamMoveDown       = (1<<5)
};
uint8 camMoveState = CamMoveNone;



void Update( float time, float frametime )
{
    // Check which bits are on and add direction vector
    if( camMoveState )
    {   
        if( camMoveState & CamMoveForward )
            lMoveVector += ForwardVector;
        else if( camMoveState & CamMoveBackwards )
            lMoveVector += -ForwardVector;
        if( camMoveState & CamMoveUp )
            lMoveVector += UpVector;
        else if( camMoveState & CamMoveDown )
            lMoveVector += -UpVector;
        if( camMoveState & CamMoveRight )
            lMoveVector += RightVector;
        else if( camMoveState & CamMoveLeft )
            lMoveVector += -RightVector;
        // Normalize final direction vector
        lMoveVector.normalize();
    }

    // Update camera position
    camPos += lMoveVector;
}



bool OnKeyDown( ... )
{
    if( event.getCode() == KeyEvent::KEY_UP )
    {
        camMoveState = camMoveState | CamMoveForward;
    }
    if( event.getCode() == KeyEvent::KEY_DOWN )
    {
        camMoveState = camMoveState | CamMoveBackwards;
    }
    if( event.getCode() == KeyEvent::KEY_q )
    {
        camMoveState = camMoveState | CamMoveUp;
    }
    if( event.getCode() == KeyEvent::KEY_a )
    {
        camMoveState = camMoveState | CamMoveDown;
    }
    if( event.getCode() == KeyEvent::KEY_LEFT )
    {
        camMoveState = camMoveState | CamMoveLeft;
    }
    if( event.getCode() == KeyEvent::KEY_RIGHT )
    {
        camMoveState = camMoveState | CamMoveRight;
    }
}


bool OnKeyUp( ... )
{
    // Cancel the bit for current direction
    if( event.getCode() == KeyEvent::KEY_UP )
    {
        camMoveState = camMoveState & ~CamMoveForward;
    }
    if( event.getCode() == KeyEvent::KEY_DOWN )
    {
        camMoveState = camMoveState & ~CamMoveBackwards;
    }
    if( event.getCode() == KeyEvent::KEY_q )
    {
        camMoveState = camMoveState & ~CamMoveUp;
    }
    if( event.getCode() == KeyEvent::KEY_a )
    {
        camMoveState = camMoveState & ~CamMoveDown;
    }
    if( event.getCode() == KeyEvent::KEY_LEFT )
    {
        camMoveState = camMoveState & ~CamMoveLeft;
    }
    if( event.getCode() == KeyEvent::KEY_RIGHT )
    {
        camMoveState = camMoveState & ~CamMoveRight;
    } 
}