glCopyTexImage2D Interface to
OpenGL function glCopyTexImage2D
usage: glCopyTexImage2D( target, level, internalformat, x, y, width, height, border )
C function: void glCopyTexImage2D(GLenum target, GLint level, GLenum internalformat, GLint x, GLint y, GLsizei width, GLsizei height, GLint border)
Psychtoolbox/PsychOpenGL/MOGL/wrap/glCopyTexImage2D.m