glTexSubImage1D Interface to
OpenGL function glTexSubImage1D
usage: glTexSubImage1D( target, level, xoffset, width, format, type, pixels )
C function: void glTexSubImage1D(GLenum target, GLint level, GLint xoffset, GLsizei width, GLenum format, GLenum type, const GLvoid* pixels)
Psychtoolbox/PsychOpenGL/MOGL/wrap/glTexSubImage1D.m