public D3DHardwarePixelBuffer( BufferUsage usage )
: base( 0, 0, 0, Axiom.Media.PixelFormat.Unknown, usage, false, false )
{
device = null;
surface = null;
volume = null;
tempSurface = null;
tempVolume = null;
doMipmapGen = false;
HWMipmaps = false;
mipTex = null;
sliceTRT = new List<RenderTexture>();
}