http://www.microsoft.com/japan/msdn/library/ja/DirectX9_c/directx/graphics/programmingguide/fixedfunction/textures/coordinates/mappingtexelstopixels.asp
ʂ̃TCgɃWv悤ƂĂ܂BXΏL̃NNbNĂ
UPLIFTōLȂő̌܂傤IKȉ{Ct܂I