D3DXColor的操作

参考:

http://blog.csdn.net/caimouse/article/details/120888

http://blog.csdn.net/caimouse/article/details/120863

http://blog.csdn.net/caimouse/article/details/120597

//--------------------------
// Color
//--------------------------

D3DX10INLINE D3DXCOLOR* D3DXColorNegative
    (D3DXCOLOR *pOut, CONST D3DXCOLOR *pC)
{
#ifdef D3DX10_DEBUG
    if(!pOut || !pC)
        return NULL;
#endif

    pOut->r = 1.0f - pC->r;
    pOut->g = 1.0f - pC->g;
    pOut->b = 1.0f - pC->b;
    pOut->a = pC->a;
    return pOut;
}

D3DX10INLINE D3DXCOLOR* D3DXColorAdd
    (D3DXCOLOR *pOut, CONST D3DXCOLOR *pC1, CONST D3DXCOLOR *pC2)
{
#ifdef D3DX10_DEBUG
    if(!pOut || !pC1 || !pC2)
        return NULL;
#endif

    pOut->r = pC1->r + pC2->r;
    pOut->g = pC1->g + pC2->g;
    pOut->b = pC1->b + pC2->b;
    pOut->a = pC1->a + pC2->a;
    return pOut;
}

D3DX10INLINE D3DXCOLOR* D3DXColorSubtract
    (D3DXCOLOR *pOut, CONST D3DXCOLOR *pC1, CONST D3DXCOLOR *pC2)
{
#ifdef D3DX10_DEBUG
    if(!pOut || !pC1 || !pC2)
        return NULL;
#endif

    pOut->r = pC1->r - pC2->r;
    pOut->g = pC1->g - pC2->g;
    pOut->b = pC1->b - pC2->b;
    pOut->a = pC1->a - pC2->a;
    return pOut;
}

D3DX10INLINE D3DXCOLOR* D3DXColorScale
    (D3DXCOLOR *pOut, CONST D3DXCOLOR *pC, FLOAT s)
{
#ifdef D3DX10_DEBUG
    if(!pOut || !pC)
        return NULL;
#endif

    pOut->r = pC->r * s;
    pOut->g = pC->g * s;
    pOut->b = pC->b * s;
    pOut->a = pC->a * s;
    return pOut;
}

D3DX10INLINE D3DXCOLOR* D3DXColorModulate
    (D3DXCOLOR *pOut, CONST D3DXCOLOR *pC1, CONST D3DXCOLOR *pC2)
{
#ifdef D3DX10_DEBUG
    if(!pOut || !pC1 || !pC2)
        return NULL;
#endif

    pOut->r = pC1->r * pC2->r;
    pOut->g = pC1->g * pC2->g;
    pOut->b = pC1->b * pC2->b;
    pOut->a = pC1->a * pC2->a;
    return pOut;
}

D3DX10INLINE D3DXCOLOR* D3DXColorLerp
    (D3DXCOLOR *pOut, CONST D3DXCOLOR *pC1, CONST D3DXCOLOR *pC2, FLOAT s)
{
#ifdef D3DX10_DEBUG
    if(!pOut || !pC1 || !pC2)
        return NULL;
#endif

    pOut->r = pC1->r + s * (pC2->r - pC1->r);
    pOut->g = pC1->g + s * (pC2->g - pC1->g);
    pOut->b = pC1->b + s * (pC2->b - pC1->b);
    pOut->a = pC1->a + s * (pC2->a - pC1->a);
    return pOut;
}