code: func ClearTexImage(texture uint32, level int32, format uint32, xtype uint32, data unsafe.Pointer) {
  	syscall.Syscall6(gpClearTexImage, 5, uintptr(texture), uintptr(level), uintptr(format), uintptr(xtype), uintptr(data), 0)
  }
docs: // fills all a texture image with a constant value