func ReadnPixels(x int32, y int32, width int32, height int32, format uint32, xtype uint32, bufSize int32, data unsafe.Pointer) {
	C.glowReadnPixels(gpReadnPixels, (C.GLint)(x), (C.GLint)(y), (C.GLsizei)(width), (C.GLsizei)(height), (C.GLenum)(format), (C.GLenum)(xtype), (C.GLsizei)(bufSize), data)
}
func ReadnPixels(x int32, y int32, width int32, height int32, format uint32, xtype uint32, bufSize int32, data unsafe.Pointer) {
	C.glowReadnPixels(gpReadnPixels, (C.GLint)(x), (C.GLint)(y), (C.GLsizei)(width), (C.GLsizei)(height), (C.GLenum)(format), (C.GLenum)(xtype), (C.GLsizei)(bufSize), data)
}
func ReadnPixels ( x int32 , y int32 , width int32 , height int32 , format uint32 , xtype uint32 , bufSize int32 , data unsafe . Pointer ) { C . glowReadnPixels ( gpReadnPixels , ( C . GLint ) ( x ) , ( C . GLint ) ( y ) , ( C . GLsizei ) ( width ) , ( C . GLsizei ) ( height ) , ( C . GLenum ) ( format ) , ( C . GLenum ) ( xtype ) , ( C . GLsizei ) ( bufSize ) , data ) }
// read a block of pixels from the frame buffer
read a block of pixels from the frame buffer