page¶

rejoin or flip the framebuffer pages
NAME
    page - rejoin or flip the framebuffer pages

SYNOPSIS
    page [sync|flip]

DESCRIPTION
    The display has two framebuffer pages (stage 8b double buffering).
    With no argument (or `sync`) the draw page REJOINS the display page
    -- the recovery move when a program died mid-flip and left them
    split, which looks like a frozen screen that ignores drawing. With
    `flip` the pages swap the other way: what was just drawn becomes
    visible and drawing moves to the hidden page -- the manual
    double-buffer step (draw, flip, draw, flip). Flips land at the
    panel's frame boundary, tear-free. Needs the GL engine (the page
    verbs are graphics-language opcodes since stage 10b: FLIP=2,
    PGSYNC=3, poked at the $FF50 command FIFO).

EXAMPLES
    page              screen ignoring your drawing? this fixes it
    page flip         show the hidden page you just drew

SEE ALSO
    tri, gfx, basic (GRAPHICS section)