view release on metacpan or  search on metacpan

pogl_gl_top.xs  view on Meta::CPAN

int
__had_dbuffer_hack()

#ifdef HAVE_GLpc			/* GLX */

#// $ID = glpcOpenWindow($x,$y,$w,$h,$pw,$steal,$event_mask,@attribs);
HV *
glpcOpenWindow(x,y,w,h,pw,event_mask,steal, ...)
    int	x
    int	y
    int	w
    int	h
    int	pw
    long	event_mask
    int	steal
    CODE:
{
    XEvent event;
    Window pwin = (Window)pw;
    unsigned int err;
    int *attributes = default_attributes + 1;
    int *a_buf = NULL;

    RETVAL = newHV(); /* Create hash to return GL Object info */

    if(items > NUM_ARG){
        int i;
        a_buf = (int *) malloc((items-NUM_ARG+2) * sizeof(int));
        a_buf[0] = GLX_DOUBLEBUFFER; /* Preallocate */
        attributes = a_buf + 1;
        for (i=NUM_ARG; i<items; i++) {
            attributes[i-NUM_ARG] = SvIV(ST(i));
        }
        attributes[items-NUM_ARG] = None;
    }
    if (debug) {
        int i;	
        for (i=0; attributes[i] != None; i++) {
            printf("att=%d %d\n", i, attributes[i]);
        }
    }
    /* get a connection */
    if (!dpy_open) {
        dpy = XOpenDisplay(NULL);
        dpy_open = 1;
    }
    if (!dpy) {
        croak("ERROR: failed to get an X connection");
    } else if (debug) {
        printf("Display open %x\n", dpy);
    }		

    /* get an appropriate visual */
    vi = glXChooseVisual(dpy, DefaultScreen(dpy), attributes);
    if (!vi) { /* Might have happened that one does not
                * *need* DOUBLEBUFFER, but the display does
                * not provide SINGLEBUFFER; and the semantic
                * of GLX_DOUBLEBUFFER is that if it misses,
                * only SINGLEBUFFER visuals are selected.  */
        attributes--; /* GLX_DOUBLEBUFFER preallocated there */
        vi = glXChooseVisual(dpy, DefaultScreen(dpy), attributes); /* Retry */
        if (vi)
            DBUFFER_HACK = 1;
    }
    if (a_buf)
        free(a_buf);
    if(!vi) {
        croak("ERROR: failed to get an X visual\n");
    } else if (debug) {
        printf("Visual open %x\n", vi);
    }		

    /* A blank line here will confuse xsubpp ;-) */
#ifdef HAVE_GLX
    /* create a GLX context */
    ctx = glXCreateContext(dpy, vi, 0, GL_TRUE);
    if (!ctx) {
        croak("ERROR: failed to get an X Context");
    } else if (debug) {
        printf("Context Created %x\n", ctx);
    }

    /* create a color map */
    cmap = XCreateColormap(dpy, RootWindow(dpy, vi->screen),
            vi->visual, AllocNone);

    /* create a window */
    swa.colormap = cmap;
    swa.border_pixel = 0;
    swa.event_mask = event_mask;
#endif	/* defined HAVE_GLX */

    if (!pwin) {
        pwin = RootWindow(dpy, vi->screen);
        if (debug) printf("Using root as parent window 0x%x\n", pwin);
    }
    if (steal) {
        win = nativeWindowId(dpy, pwin); /* What about depth/visual */
    } else {
        win = XCreateWindow(dpy, pwin, 
                x, y, w, h,
                0, vi->depth, InputOutput, vi->visual,
                CWBorderPixel|CWColormap|CWEventMask, &swa);
        /* NOTE: PDL code had CWBackPixel above */
    }
    if (!win) {
        croak("No Window");
    } else {
        if (debug) printf("win = 0x%x\n", win);
    }
    XMapWindow(dpy, win);
#ifndef HAVE_GLX  /* For OS/2 GLX emulation stuff -chm 2009.09.14 */
    /* On OS/2: cannot create a context before mapping something... */
    /* create a GLX context */
    ctx = glXCreateContext(dpy, vi, 0, GL_TRUE);
    if (!ctx)
        croak("No context!\n");

    LastEventMask = event_mask;