IIternalFormat specifies the internal format of the texture array. The pixels in the row are processed exactly as if glCopyPixels had been called, but the process stops just before final conversion. Pixel ordering is such that lower x screen coordinates correspond to lower texture coordinates.
Parameters target Specifies the target texture.
Level 0 is the base image level. Level n is the nth mipmap reduction image. The height of the texture image is 1. Must be either 0 or 1. The glCopyTexImage1D subroutine is available only if the GL version is 1.1 or greater.