Gles20 glcopytexsubimage2d gles20:gles20.glCopyTexSubImage2D Function glCopyTexSubImage2D:Void( target_:GLenum,level_:GLint,xoffset_:GLint,yoffset_:GLint,x_:GLint,y_:GLint,width_:GLsizei,height_:GLsizei )#