! Copyright (C) 2005, 2006 Eduardo Cavazos and Slava Pestov
! See http://factorcode.org/license.txt for BSD license.
USING: alien alien.c-types hashtables kernel math math.vectors
math.bitwise namespaces sequences x11.xlib x11.constants x11.glx
arrays fry ;
IN: x11.windows

: create-window-mask ( -- n )
    { CWBackPixel CWBorderPixel CWColormap CWEventMask } flags ;

: create-colormap ( visinfo -- colormap )
    dpy get root get rot XVisualInfo-visual AllocNone
    XCreateColormap ;

: event-mask ( -- n )
    {
        ExposureMask
        StructureNotifyMask
        KeyPressMask
        KeyReleaseMask
        ButtonPressMask
        ButtonReleaseMask
        PointerMotionMask
        FocusChangeMask
        EnterWindowMask
        LeaveWindowMask
        PropertyChangeMask
    } flags ;

: window-attributes ( visinfo -- attributes )
    "XSetWindowAttributes" <c-object>
    0 over set-XSetWindowAttributes-background_pixel
    0 over set-XSetWindowAttributes-border_pixel
    [ [ create-colormap ] dip set-XSetWindowAttributes-colormap ] keep
    event-mask over set-XSetWindowAttributes-event_mask ;

: set-size-hints ( window -- )
    "XSizeHints" <c-object>
    USPosition over set-XSizeHints-flags
    [ dpy get ] 2dip XSetWMNormalHints ;

: auto-position ( window loc -- )
    { 0 0 } = [ drop ] [ set-size-hints ] if ;

: create-window ( loc dim visinfo -- window )
    pick [
        [ [ [ dpy get root get ] dip first2 ] dip { 1 1 } vmax first2 0 ] dip
        [ XVisualInfo-depth InputOutput ] keep
        [ XVisualInfo-visual create-window-mask ] keep
        window-attributes XCreateWindow
        dup
    ] dip auto-position ;

: glx-window ( loc dim -- window glx )
    GLX_DOUBLEBUFFER 1array choose-visual
    [ create-window ] keep
    [ create-glx ] keep
    XFree ;

: create-pixmap ( dim visual -- pixmap )
    [ [ { 0 0 } swap ] dip create-window ] [
        drop [ dpy get ] 2dip first2 24 XCreatePixmap
        [ "Failed to create offscreen pixmap" throw ] unless*
    ] 2bi ;

: (create-glx-pixmap) ( pixmap visual -- pixmap glx-pixmap )
    [ drop ] [
        [ dpy get ] 2dip swap glXCreateGLXPixmap
        [ "Failed to create offscreen GLXPixmap" throw ] unless*
    ] 2bi ;

: create-glx-pixmap ( dim visual -- pixmap glx-pixmap )
    [ create-pixmap ] [ (create-glx-pixmap) ] bi ;

: glx-pixmap ( dim -- glx pixmap glx-pixmap )
    { } choose-visual
    [ nip create-glx ] [ create-glx-pixmap ] [ nip XFree ] 2tri ;

: destroy-window ( win -- )
    dpy get swap XDestroyWindow drop ;

: set-closable ( win -- )
    dpy get swap "WM_DELETE_WINDOW" x-atom <Atom> 1
    XSetWMProtocols drop ;

: map-window ( win -- ) dpy get swap XMapWindow drop ;

: unmap-window ( win -- ) dpy get swap XUnmapWindow drop ;

: pixmap-bits ( dim pixmap -- alien )
    swap first2 '[ dpy get _ 0 0 _ _ AllPlanes ZPixmap XGetImage ] call
    [ XImage-pixels ] [ XDestroyImage drop ] bi ;