code: func VertexAttribFormat(attribindex uint32, size int32, xtype uint32, normalized bool, relativeoffset uint32) {
  	syscall.Syscall6(gpVertexAttribFormat, 5, uintptr(attribindex), uintptr(size), uintptr(xtype), boolToUintptr(normalized), uintptr(relativeoffset), 0)
  }
docs: // specify the organization of vertex arrays