code: func CopyTexImage2D(target uint32, level int32, internalformat uint32, x int32, y int32, width int32, height int32, border int32) {
  	C.glowCopyTexImage2D(gpCopyTexImage2D, (C.GLenum)(target), (C.GLint)(level), (C.GLenum)(internalformat), (C.GLint)(x), (C.GLint)(y), (C.GLsizei)(width), (C.GLsizei)(height), (C.GLint)(border))
  }
docs: // copy pixels into a 2D texture image