d3dutil.cpp

《Introduction to 3D Game Progamming with DirectX9.0》 中文版 超级好的DX书 由翁云兵翻译 很难找到

                // 1.1. ..1. 1.1. .... A2A0
                // 11.. 11.. 11.. .... CCC0

                const WORD wMask[5] = { 0xccc0, 0xa2a0, 0xa4a0, 0xa2a0, 0xccc0 };
                if( wMask[y] & (1 << (15 - x)) )
                {
                    pBitmap[dwWidth*y + x] |= 0xff808080;
                }
            }
        }
    }
    pCursorSurface->UnlockRect();

    // Set the device cursor
    if( FAILED( hr = pd3dDevice->SetCursorProperties( iconinfo.xHotspot, 
        iconinfo.yHotspot, pCursorSurface ) ) )
    {
        goto End;
    }

    hr = S_OK;

End:
    if( iconinfo.hbmMask != NULL )
        DeleteObject( iconinfo.hbmMask );
    if( iconinfo.hbmColor != NULL )
        DeleteObject( iconinfo.hbmColor );
    if( hdcScreen != NULL )
        ReleaseDC( NULL, hdcScreen );
    if( hdcColor != NULL )
        DeleteDC( hdcColor );
    if( hdcMask != NULL )
        DeleteDC( hdcMask );
    SAFE_DELETE_ARRAY( pcrArrayColor );
    SAFE_DELETE_ARRAY( pcrArrayMask );
    SAFE_RELEASE( pCursorSurface );
    return hr;
}



//-----------------------------------------------------------------------------
// Name: D3DXQuaternionUnitAxisToUnitAxis2
// Desc: Axis to axis quaternion double angle (no normalization)
//       Takes two points on unit sphere an angle THETA apart, returns
//       quaternion that represents a rotation around cross product by 2*THETA.
//-----------------------------------------------------------------------------
inline D3DXQUATERNION* WINAPI D3DXQuaternionUnitAxisToUnitAxis2
( D3DXQUATERNION *pOut, const D3DXVECTOR3 *pvFrom, const D3DXVECTOR3 *pvTo)
{
    D3DXVECTOR3 vAxis;
    D3DXVec3Cross(&vAxis, pvFrom, pvTo);    // proportional to sin(theta)
    pOut->x = vAxis.x;
    pOut->y = vAxis.y;
    pOut->z = vAxis.z;
    pOut->w = D3DXVec3Dot( pvFrom, pvTo );
    return pOut;
}




//-----------------------------------------------------------------------------
// Name: D3DXQuaternionAxisToAxis
// Desc: Axis to axis quaternion 
//       Takes two points on unit sphere an angle THETA apart, returns
//       quaternion that represents a rotation around cross product by theta.
//-----------------------------------------------------------------------------
inline D3DXQUATERNION* WINAPI D3DXQuaternionAxisToAxis
( D3DXQUATERNION *pOut, const D3DXVECTOR3 *pvFrom, const D3DXVECTOR3 *pvTo)
{
    D3DXVECTOR3 vA, vB;
    D3DXVec3Normalize(&vA, pvFrom);
    D3DXVec3Normalize(&vB, pvTo);
    D3DXVECTOR3 vHalf(vA + vB);
    D3DXVec3Normalize(&vHalf, &vHalf);
    return D3DXQuaternionUnitAxisToUnitAxis2(pOut, &vA, &vHalf);
}




//-----------------------------------------------------------------------------
// Name:
// Desc:
//-----------------------------------------------------------------------------
CD3DArcBall::CD3DArcBall()
{
    D3DXQuaternionIdentity( &m_qDown );
    D3DXQuaternionIdentity( &m_qNow );
    D3DXMatrixIdentity( &m_matRotation );
    D3DXMatrixIdentity( &m_matRotationDelta );
    D3DXMatrixIdentity( &m_matTranslation );
    D3DXMatrixIdentity( &m_matTranslationDelta );
    m_bDrag = FALSE;
    m_fRadiusTranslation = 1.0f;
    m_bRightHanded = FALSE;
}




//-----------------------------------------------------------------------------
// Name:
// Desc:
//-----------------------------------------------------------------------------
VOID CD3DArcBall::SetWindow( int iWidth, int iHeight, float fRadius )
{
    // Set ArcBall info
    m_iWidth  = iWidth;
    m_iHeight = iHeight;
    m_fRadius = fRadius;
}




//-----------------------------------------------------------------------------
// Name:
// Desc:
//-----------------------------------------------------------------------------
D3DXVECTOR3 CD3DArcBall::ScreenToVector( int sx, int sy )
{
    // Scale to screen
    FLOAT x   = -(sx - m_iWidth/2)  / (m_fRadius*m_iWidth/2);
    FLOAT y   =  (sy - m_iHeight/2) / (m_fRadius*m_iHeight/2);

    if( m_bRightHanded )
    {
        x = -x;
        y = -y;
    }

    FLOAT z   = 0.0f;
    FLOAT mag = x*x + y*y;

    if( mag > 1.0f )
    {
        FLOAT scale = 1.0f/sqrtf(mag);
        x *= scale;
        y *= scale;
    }
    else
        z = sqrtf( 1.0f - mag );

    // Return vector
    return D3DXVECTOR3( x, y, z );
}




//-----------------------------------------------------------------------------
// Name:
// Desc:
//-----------------------------------------------------------------------------
VOID CD3DArcBall::SetRadius( FLOAT fRadius )
{
    m_fRadiusTranslation = fRadius;
}




//-----------------------------------------------------------------------------
// Name:
// Desc:
//-----------------------------------------------------------------------------
LRESULT CD3DArcBall::HandleMouseMessages( HWND hWnd, UINT uMsg, WPARAM wParam,
                                          LPARAM lParam )
{
    static int         iCurMouseX;      // Saved mouse position
    static int         iCurMouseY;
    static D3DXVECTOR3 s_vDown;         // Button down vector

    // Current mouse position
    int iMouseX = GET_X_LPARAM(lParam);
    int iMouseY = GET_Y_LPARAM(lParam);

    switch( uMsg )
    {
        case WM_RBUTTONDOWN:
        case WM_MBUTTONDOWN:
            // Store off the position of the cursor when the button is pressed
            iCurMouseX = iMouseX;
            iCurMouseY = iMouseY;
            return TRUE;

        case WM_LBUTTONDOWN:
            // Start drag mode
            m_bDrag = TRUE;
            s_vDown = ScreenToVector( iMouseX, iMouseY );
            m_qDown = m_qNow;
            return TRUE;

        case WM_LBUTTONUP:
            // End drag mode
            m_bDrag = FALSE;
            return TRUE;

        case WM_MOUSEMOVE:
            // Drag object
            if( MK_LBUTTON&wParam )
            {
                if( m_bDrag )
                {
                    // recompute m_qNow
                    D3DXVECTOR3 vCur = ScreenToVector( iMouseX, iMouseY );
                    D3DXQUATERNION qAxisToAxis;
                    D3DXQuaternionAxisToAxis(&qAxisToAxis, &s_vDown, &vCur);
                    m_qNow = m_qDown;
                    m_qNow *= qAxisToAxis;
                    D3DXMatrixRotationQuaternion(&m_matRotationDelta, &qAxisToAxis);
                }
                else
                    D3DXMatrixIdentity(&m_matRotationDelta);
                D3DXMatrixRotationQuaternion(&m_matRotation, &m_qNow);
                m_bDrag = TRUE;
            }
            else if( (MK_RBUTTON&wParam) || (MK_MBUTTON&wParam) )
            {
                // Normalize based on size of window and bounding sphere radius
                FLOAT fDeltaX = ( iCurMouseX-iMouseX ) * m_fRadiusTranslation / m_iWidth;
                FLOAT fDeltaY = ( iCurMouseY-iMouseY ) * m_fRadiusTranslation / m_iHeight;

                if( wParam & MK_RBUTTON )
                {
                    D3DXMatrixTranslation( &m_matTranslationDelta, -2*fDeltaX, 2*fDeltaY, 0.0f );
                    D3DXMatrixMultiply( &m_matTranslation, &m_matTranslation, &m_matTranslationDelta );
                }
                else  // wParam & MK_MBUTTON
                {
                    D3DXMatrixTranslation( &m_matTranslationDelta, 0.0f, 0.0f, 5*fDeltaY );
                    D3DXMatrixMultiply( &m_matTranslation, &m_matTranslation, &m_matTranslationDelta );
                }

                // Store mouse coordinate
                iCurMouseX = iMouseX;
                iCurMouseY = iMouseY;
            }
            return TRUE;
    }

    return FALSE;
}




//-----------------------------------------------------------------------------
// Name:
// Desc:
//-----------------------------------------------------------------------------
CD3DCamera::CD3DCamera()
{
    // Set attributes for the view matrix
    D3DXVECTOR3 vEyePt(0.0f,0.0f,0.0f);
    D3DXVECTOR3 vLookatPt(0.0f,0.0f,1.0f);
    D3DXVECTOR3 vUpVec(0.0f,1.0f,0.0f);
    SetViewParams( vEyePt, vLookatPt, vUpVec );

    // Set attributes for the projection matrix
    SetProjParams( D3DX_PI/4, 1.0f, 1.0f, 1000.0f );
}




//-----------------------------------------------------------------------------
// Name:
// Desc:
//-----------------------------------------------------------------------------
VOID CD3DCamera::SetViewParams( D3DXVECTOR3 &vEyePt, D3DXVECTOR3& vLookatPt,
                                D3DXVECTOR3& vUpVec )
{
    // Set attributes for the view matrix
    m_vEyePt    = vEyePt;
    m_vLookatPt = vLookatPt;
    m_vUpVec    = vUpVec;
    D3DXVECTOR3 vDir = m_vLookatPt - m_vEyePt;
    D3DXVec3Normalize( &m_vView, &vDir );
    D3DXVec3Cross( &m_vCross, &m_vView, &m_vUpVec );

    D3DXMatrixLookAtLH( &m_matView, &m_vEyePt, &m_vLookatPt, &m_vUpVec );
    D3DXMatrixInverse( &m_matBillboard, NULL, &m_matView );
    m_matBillboard._41 = 0.0f;
    m_matBillboard._42 = 0.0f;
    m_matBillboard._43 = 0.0f;
}




//-----------------------------------------------------------------------------
// Name:
// Desc:
//-----------------------------------------------------------------------------
VOID CD3DCamera::SetProjParams( FLOAT fFOV, FLOAT fAspect, FLOAT fNearPlane,
                                FLOAT fFarPlane )
{
    // Set attributes for the projection matrix
    m_fFOV        = fFOV;
    m_fAspect     = fAspect;
    m_fNearPlane  = fNearPlane;
    m_fFarPlane   = fFarPlane;

    D3DXMatrixPerspectiveFovLH( &m_matProj, fFOV, fAspect, fNearPlane, fFarPlane );
}