Save and restore GL parameters as appropriate

According to the docs "glPixelStorei sets pixel storage modes that
affect the operation of subsequent glReadPixels as well as the
unpacking of texture patterns (see glTexImage2D and glTexSubImage2D)."

Hence we
(a) must be aware that current values of these modes can be anything
    set by user or FLTK code before
(b) should be polite and restore these modes to previous values

See discussion in fltk.coredev, thread "gl_draw problem" started on
Apr 05, 2019.

0 files changed, 0 insertions, 0 deletions