glGenTextures returns n texture names in textures. There is no guarantee that the names form a contiguous set of integers; however, it is guaranteed that none of the returned names was in use immediately before the call to glGenTextures.
The generated textures have no dimensionality; they assume the dimensionality of the texture target to which they are first bound (see glBindTexture).
Texture names returned by a call to glGenTextures are not returned by subsequent calls, unless they are first deleted with glDeleteTextures.
GL_INVALID_VALUE is generated if n is negative.
GL_INVALID_OPERATION is generated if glGenTextures is executed between the execution of glBegin and the corresponding execution of glEnd.
glBindTexture , glCopyTexImage1D , glCopyTexImage2D , glDeleteTextures , glGet , glGetTexParameter , glTexImage1D , glTexImage2D , glTexImage3D , glTexParameter