OpenGL 纹理映射的好资料
http://wenku.baidu.com/link?url=iUewI7BeCeemTppcrX5pX-rWI_fvBPgLE7oH8dWPErgS9Uj-P2EZqtVeWItwCl07OjAu0ARGEvjmWh0_CHtHw_
http://wenku.baidu.com/link?url=iUewI7BeCeemTppcrX5pX-rWI_fvBPgLE7oH8dWPErgS9Uj-P2EZqtVeWItwCl07OjAu0ARGEvjmWh0_CHtHw_