src/hd/rhd_x11.c

/* Copyright (c) 1998 Silicon Graphics, Inc. */

#ifndef lint
static char SCCSid[] = "$SunId$ SGI";
#endif

/*
 * X11 driver for holodeck display.
 * Based on rview driver.
 */

#include "standard.h"
#include "rhd_qtree.h"

#include  <X11/Xlib.h>
#include  <X11/cursorfont.h>
#include  <X11/Xutil.h>

#include  "x11icon.h"

#ifndef RAYQLEN
#define RAYQLEN         50000           /* max. rays to queue before flush */
#endif

#ifndef FEQ
#define FEQ(a,b)        ((a)-(b) <= FTINY && (a)-(b) >= -FTINY)
#endif

#define GAMMA           2.2             /* default gamma correction */

#define MOVPCT          7               /* percent distance to move /frame */
#define MOVDIR(b)       ((b)==Button1 ? 1 : (b)==Button2 ? 0 : -1)
#define MOVDEG          (-5)            /* degrees to orbit CW/down /frame */
#define MOVORB(s)       ((s)&ShiftMask ? 1 : (s)&ControlMask ? -1 : 0)

#define MINWIDTH        480             /* minimum graphics window width */
#define MINHEIGHT       400             /* minimum graphics window height */

#define VIEWDIST        356             /* assumed viewing distance (mm) */

#define BORWIDTH        5               /* border width */

#define  ourscreen      DefaultScreen(ourdisplay)
#define  ourroot        RootWindow(ourdisplay,ourscreen)
#define  ourmask        (StructureNotifyMask|ExposureMask|KeyPressMask|\
                        ButtonPressMask|ButtonReleaseMask)

#define  levptr(etype)  ((etype *)&currentevent)

struct driver   odev;                   /* global device driver structure */

static XEvent  currentevent;            /* current event */

static int  ncolors = 0;                /* color table size */
static int  mapped = 0;                 /* window is mapped? */
static unsigned long  *pixval = NULL;   /* allocated pixels */
static unsigned long  ourblack=0, ourwhite=1;

static Display  *ourdisplay = NULL;     /* our display */
static XVisualInfo  ourvinfo;           /* our visual information */
static Window  gwind = 0;               /* our graphics window */
static GC  ourgc = 0;                   /* our graphics context for drawing */
static Colormap ourmap = 0;             /* our color map */

static double   pwidth, pheight;        /* pixel dimensions (mm) */

static int      inpresflags;            /* input result flags */

static int      headlocked = 0;         /* lock vertical motion */

static int  getpixels(), xnewcolr(), freepixels(), resizewindow(),
                getevent(), getkey(), moveview(), getmove(), fixwindow();
static unsigned long  true_pixel();


static int
mytmflags()                     /* figure out tone mapping flags */
{
        extern char     *progname;
        register char   *cp, *tail;
                                        /* find basic name */
        for (cp = tail = progname; *cp; cp++)
                if (*cp == '/')
                        tail = cp+1;
        for (cp = tail; *cp && *cp != '.'; cp++)
                ;
        if (cp-tail == 3 && !strncmp(tail, "x11", 3))
                return(TM_F_CAMERA|TM_F_NOSTDERR);
        if (cp-tail == 4 && !strncmp(tail, "x11h", 4))
                return(TM_F_HUMAN|TM_F_NOSTDERR);
        error(USER, "illegal driver name");
}


dev_open(id)                    /* initialize X11 driver */
char  *id;
{
        extern char  *getenv();
        static RGBPRIMS myprims = STDPRIMS;
        char  *ev;
        double  gamval = GAMMA;
        RGBPRIMP        dpri = stdprims;
        int  nplanes;
        XSetWindowAttributes    ourwinattr;
        XWMHints  ourxwmhints;
        XSizeHints      oursizhints;
                                        /* set quadtree globals */
        qtMinNodesiz = 2;
                                        /* open display server */
        ourdisplay = XOpenDisplay(NULL);
        if (ourdisplay == NULL)
                error(USER, "cannot open X-windows; DISPLAY variable set?\n");
                                        /* find a usable visual */
        nplanes = DisplayPlanes(ourdisplay, ourscreen);
        if (XMatchVisualInfo(ourdisplay,ourscreen,
                                nplanes>12?nplanes:24,TrueColor,&ourvinfo) ||
                        XMatchVisualInfo(ourdisplay,ourscreen,
                                nplanes>12?nplanes:24,DirectColor,&ourvinfo)) {
                ourblack = 0;
                ourwhite = ourvinfo.red_mask |
                                ourvinfo.green_mask |
                                ourvinfo.blue_mask ;
        } else {
                if (nplanes < 4)
                        error(INTERNAL, "not enough colors\n");
                if (!XMatchVisualInfo(ourdisplay,ourscreen,
                                        nplanes,PseudoColor,&ourvinfo) &&
                                !XMatchVisualInfo(ourdisplay,ourscreen,
                                        nplanes,GrayScale,&ourvinfo))
                        error(INTERNAL, "unsupported visual type\n");
                ourblack = BlackPixel(ourdisplay,ourscreen);
                ourwhite = WhitePixel(ourdisplay,ourscreen);
        }
                                        /* set gamma and tone mapping */
        if ((ev = XGetDefault(ourdisplay, "radiance", "gamma")) != NULL
                        || (ev = getenv("DISPLAY_GAMMA")) != NULL)
                gamval = atof(ev);
        if ((ev = getenv("DISPLAY_PRIMARIES")) != NULL &&
                        sscanf(ev, "%f %f %f %f %f %f %f %f",
                                &myprims[RED][CIEX],&myprims[RED][CIEY],
                                &myprims[GRN][CIEX],&myprims[GRN][CIEY],
                                &myprims[BLU][CIEX],&myprims[BLU][CIEY],
                                &myprims[WHT][CIEX],&myprims[WHT][CIEY]) >= 6)
                dpri = myprims;
        if (tmInit(mytmflags(), dpri, gamval) == NULL)
                error(SYSTEM, "not enough memory in dev_open");
                                        /* open window */
        ourwinattr.background_pixel = ourblack;
        ourwinattr.border_pixel = ourblack;
        ourwinattr.event_mask = ourmask;
                                        /* this is stupid */
        ourwinattr.colormap = XCreateColormap(ourdisplay, ourroot,
                                ourvinfo.visual, AllocNone);
        gwind = XCreateWindow(ourdisplay, ourroot, 0, 0,
                DisplayWidth(ourdisplay,ourscreen)-2*BORWIDTH,
                DisplayHeight(ourdisplay,ourscreen)-2*BORWIDTH,
                BORWIDTH, ourvinfo.depth, InputOutput, ourvinfo.visual,
                CWBackPixel|CWBorderPixel|CWColormap|CWEventMask, &ourwinattr);
        if (gwind == 0)
                error(SYSTEM, "cannot create window\n");
        XStoreName(ourdisplay, gwind, id);
                                        /* get graphics context */
        ourgc = XCreateGC(ourdisplay, gwind, 0, NULL);
                                        /* set window manager hints */
        ourxwmhints.flags = InputHint|IconPixmapHint;
        ourxwmhints.input = True;
        ourxwmhints.icon_pixmap = XCreateBitmapFromData(ourdisplay,
                        gwind, x11icon_bits, x11icon_width, x11icon_height);
        XSetWMHints(ourdisplay, gwind, &ourxwmhints);
        oursizhints.min_width = MINWIDTH;
        oursizhints.min_height = MINHEIGHT;
        oursizhints.flags = PMinSize;
        XSetNormalHints(ourdisplay, gwind, &oursizhints);
                                        /* figure out sensible view */
        pwidth = (double)DisplayWidthMM(ourdisplay, ourscreen) /
                        DisplayWidth(ourdisplay, ourscreen);
        pheight = (double)DisplayHeightMM(ourdisplay, ourscreen) /
                        DisplayHeight(ourdisplay, ourscreen);
        copystruct(&odev.v, &stdview);
        odev.v.type = VT_PER;
                                        /* map the window and get its size */
        XMapWindow(ourdisplay, gwind);
        dev_input();                    /* sets size and view angles */
                                        /* allocate our leaf pile */
        if (!qtAllocLeaves(DisplayWidth(ourdisplay,ourscreen) *
                        DisplayHeight(ourdisplay,ourscreen) * 3 /
                        (qtMinNodesiz*qtMinNodesiz*2)))
                error(SYSTEM, "insufficient memory for leaf storage");
        odev.name = id;
        odev.ifd = ConnectionNumber(ourdisplay);
}


dev_close()                     /* close our display */
{
        freepixels();
        XFreeGC(ourdisplay, ourgc);
        XDestroyWindow(ourdisplay, gwind);
        gwind = 0;
        ourgc = 0;
        XCloseDisplay(ourdisplay);
        ourdisplay = NULL;
        qtFreeLeaves();
        tmDone(NULL);
        odev.v.type = 0;
        odev.hres = odev.vres = 0;
        odev.ifd = -1;
}


dev_clear()                     /* clear our quadtree */
{
        qtCompost(100);
        if (ncolors > 0)
                new_ctab(ncolors);
        rayqleft = 0;                   /* hold off update */
}


int
dev_view(nv)                    /* assign new driver view */
VIEW    *nv;
{
        if (nv->type == VT_PAR ||               /* check view legality */
                        nv->horiz > 160. || nv->vert > 160.) {
                error(COMMAND, "illegal view type/angle");
                nv->type = VT_PER;
                nv->horiz = odev.v.horiz;
                nv->vert = odev.v.vert;
                return(0);
        }
        if (nv->vfore > FTINY) {
                error(COMMAND, "cannot handle fore clipping");
                nv->vfore = 0.;
                return(0);
        }
        if (nv != &odev.v) {
                if (!FEQ(nv->horiz,odev.v.horiz) ||     /* resize window? */
                                !FEQ(nv->vert,odev.v.vert)) {
                        int     dw = DisplayWidth(ourdisplay,ourscreen);
                        int     dh = DisplayHeight(ourdisplay,ourscreen);

                        dw -= 25;       /* for window frame */
                        dh -= 50;
                        odev.hres = 2.*VIEWDIST/pwidth *
                                        tan(PI/180./2.*nv->horiz);
                        odev.vres = 2.*VIEWDIST/pheight *
                                        tan(PI/180./2.*nv->vert);
                        if (odev.hres > dw) {
                                odev.vres = dw * odev.vres / odev.hres;
                                odev.hres = dw;
                        }
                        if (odev.vres > dh) {
                                odev.hres = dh * odev.hres / odev.vres;
                                odev.vres = dh;
                        }
                        XResizeWindow(ourdisplay, gwind, odev.hres, odev.vres);
                        dev_input();    /* wait for resize event */
                }
                copystruct(&odev.v, nv);
        }
        qtReplant();
        return(1);
}


dev_auxcom(cmd, args)           /* process an auxiliary command */
char    *cmd, *args;
{
        sprintf(errmsg, "%s: unknown command", cmd);
        error(COMMAND, errmsg);
}


VIEW *
dev_auxview(n, hvres)           /* return nth auxiliary view */
int     n;
int     hvres[2];
{
        if (n)
                return(NULL);
        hvres[0] = odev.hres; hvres[1] = odev.vres;
        return(&odev.v);
}


int
dev_input()                     /* get X11 input */
{
        inpresflags = 0;

        do
                getevent();

        while (XQLength(ourdisplay) > 0);

        return(inpresflags);
}


dev_paintr(rgb, xmin, ymin, xmax, ymax)         /* fill a rectangle */
BYTE    rgb[3];
int  xmin, ymin, xmax, ymax;
{
        unsigned long  pixel;

        if (!mapped)
                return;
        if (ncolors > 0)
                pixel = pixval[get_pixel(rgb, xnewcolr)];
        else
                pixel = true_pixel(rgb);
        XSetForeground(ourdisplay, ourgc, pixel);
        XFillRectangle(ourdisplay, gwind, 
                ourgc, xmin, odev.vres-ymax, xmax-xmin, ymax-ymin);
}


int
dev_flush()                     /* flush output */
{
        qtUpdate();
        rayqleft = RAYQLEN;
        return(XPending(ourdisplay));
}


static
xnewcolr(ndx, r, g, b)          /* enter a color into hardware table */
int  ndx;
int  r, g, b;
{
        XColor  xcolor;

        xcolor.pixel = pixval[ndx];
        xcolor.red = r << 8;
        xcolor.green = g << 8;
        xcolor.blue = b << 8;
        xcolor.flags = DoRed|DoGreen|DoBlue;

        XStoreColor(ourdisplay, ourmap, &xcolor);
}


static int
getpixels()                             /* get the color map */
{
        XColor  thiscolor;
        register int  i, j;

        if (ncolors > 0)
                return(ncolors);
        if (ourvinfo.visual == DefaultVisual(ourdisplay,ourscreen)) {
                ourmap = DefaultColormap(ourdisplay,ourscreen);
                goto loop;
        }
newmap:
        ourmap = XCreateColormap(ourdisplay,gwind,ourvinfo.visual,AllocNone);
loop:
        for (ncolors = ourvinfo.colormap_size;
                        ncolors > ourvinfo.colormap_size/3;
                        ncolors = ncolors*.937) {
                pixval = (unsigned long *)malloc(ncolors*sizeof(unsigned long));
                if (pixval == NULL)
                        return(ncolors = 0);
                if (XAllocColorCells(ourdisplay,ourmap,0,NULL,0,pixval,ncolors))
                        break;
                free((char *)pixval);
                pixval = NULL;
        }
        if (pixval == NULL) {
                if (ourmap == DefaultColormap(ourdisplay,ourscreen))
                        goto newmap;            /* try it with our map */
                else
                        return(ncolors = 0);    /* failed */
        }
        if (ourmap != DefaultColormap(ourdisplay,ourscreen))
                for (i = 0; i < ncolors; i++) { /* reset black and white */
                        if (pixval[i] != ourblack && pixval[i] != ourwhite)
                                continue;
                        thiscolor.pixel = pixval[i];
                        thiscolor.flags = DoRed|DoGreen|DoBlue;
                        XQueryColor(ourdisplay,
                                        DefaultColormap(ourdisplay,ourscreen),
                                        &thiscolor);
                        XStoreColor(ourdisplay, ourmap, &thiscolor);
                        for (j = i; j+1 < ncolors; j++)
                                pixval[j] = pixval[j+1];
                        ncolors--;
                        i--;
                }
        XSetWindowColormap(ourdisplay, gwind, ourmap);
        return(ncolors);
}


static
freepixels()                            /* free our pixels */
{
        if (ncolors == 0)
                return;
        XFreeColors(ourdisplay,ourmap,pixval,ncolors,0L);
        free((char *)pixval);
        pixval = NULL;
        ncolors = 0;
        if (ourmap != DefaultColormap(ourdisplay,ourscreen))
                XFreeColormap(ourdisplay, ourmap);
        ourmap = 0;
}


static unsigned long
true_pixel(rgb)                 /* return true pixel value for color */
register BYTE   rgb[3];
{
        register unsigned long  rval;

        rval = ourvinfo.red_mask*rgb[RED]/255 & ourvinfo.red_mask;
        rval |= ourvinfo.green_mask*rgb[GRN]/255 & ourvinfo.green_mask;
        rval |= ourvinfo.blue_mask*rgb[BLU]/255 & ourvinfo.blue_mask;
        return(rval);
}


static
getevent()                      /* get next event */
{
        XNextEvent(ourdisplay, levptr(XEvent));
        switch (levptr(XEvent)->type) {
        case ConfigureNotify:
                resizewindow(levptr(XConfigureEvent));
                break;
        case UnmapNotify:
                mapped = 0;
                freepixels();
                break;
        case MapNotify:
                if (ourvinfo.class == PseudoColor ||
                                ourvinfo.class == GrayScale) {
                        if (getpixels() == 0)
                                error(SYSTEM, "cannot allocate colors\n");
                        new_ctab(ncolors);
                }
                mapped = 1;
                break;
        case Expose:
                fixwindow(levptr(XExposeEvent));
                break;
        case KeyPress:
                getkey(levptr(XKeyPressedEvent));
                break;
        case ButtonPress:
                getmove(levptr(XButtonPressedEvent));
                break;
        }
}


static
ilclip(dp, wp)                  /* clip world coordinates to device */
int     dp[2][2];
FVECT   wp[2];
{
        static FVECT    vmin = {0.,0.,0.}, vmax = {1.,1.,FHUGE};
        FVECT   ip[2];
                                /* not exactly right, but who cares? */
        viewloc(ip[0], &odev.v, wp[0]);
        viewloc(ip[1], &odev.v, wp[1]);
        if (!clip(ip[0], ip[1], vmin, vmax))
                return(0);
        dp[0][0] = ip[0][0]*odev.hres;
        dp[0][1] = ip[0][1]*odev.vres;
        dp[1][0] = ip[1][0]*odev.hres;
        dp[1][1] = ip[1][1]*odev.vres;
        return(1);
}


static
draw3dline(wp)                  /* draw 3d line in world coordinates */
FVECT   wp[2];
{
        int     dp[2][2];

        if (!ilclip(dp, wp))
                return;
        XDrawLine(ourdisplay, gwind, ourgc,
                        dp[0][0], odev.vres-1 - dp[0][1],
                        dp[1][0], odev.vres-1 - dp[1][1]);
}


static
draw_grids()                    /* draw holodeck section grids */
{
        static BYTE     gridrgb[3] = {0x0, 0xff, 0xff};
        unsigned long  pixel;

        if (!mapped)
                return;
        if (ncolors > 0)
                pixel = pixval[get_pixel(gridrgb, xnewcolr)];
        else
                pixel = true_pixel(gridrgb);
        XSetForeground(ourdisplay, ourgc, pixel);
                                        /* draw each grid line */
        gridlines(draw3dline);
}


static
moveview(dx, dy, mov, orb)      /* move our view */
int     dx, dy, mov, orb;
{
        VIEW    nv;
        FVECT   odir, v1;
        double  d;
        register int    li;
                                /* start with old view */
        copystruct(&nv, &odev.v);
                                /* change view direction */
        if (mov | orb) {
                if ((li = qtFindLeaf(dx, dy)) < 0)
                        return(0);      /* not on window */
                VSUM(odir, qtL.wp[li], nv.vp, -1.);
        } else {
                if (viewray(nv.vp, nv.vdir, &odev.v,
                                (dx+.5)/odev.hres, (dy+.5)/odev.vres) < -FTINY)
                        return(0);      /* outside view */
        }
        if (orb && mov) {               /* orbit left/right */
                spinvector(odir, odir, nv.vup, d=MOVDEG*PI/180.*mov);
                VSUM(nv.vp, qtL.wp[li], odir, -1.);
                spinvector(nv.vdir, nv.vdir, nv.vup, d);
        } else if (orb) {               /* orbit up/down */
                fcross(v1, odir, nv.vup);
                if (normalize(v1) == 0.)
                        return(0);
                spinvector(odir, odir, v1, d=MOVDEG*PI/180.*orb);
                VSUM(nv.vp, qtL.wp[li], odir, -1.);
                spinvector(nv.vdir, nv.vdir, v1, d);
        } else if (mov) {               /* move forward/backward */
                d = MOVPCT/100. * mov;
                VSUM(nv.vp, nv.vp, odir, d);
        }
        if (!mov ^ !orb && headlocked) {        /* restore head height */
                VSUM(v1, odev.v.vp, nv.vp, -1.);
                d = DOT(v1, odev.v.vup);
                VSUM(nv.vp, nv.vp, odev.v.vup, d);
        }
        if (setview(&nv) != NULL)
                return(0);      /* illegal view */
        dev_view(&nv);
        inpresflags |= DFL(DC_SETVIEW);
        return(1);
}


static
getmove(ebut)                           /* get view change */
XButtonPressedEvent     *ebut;
{
        int     movdir = MOVDIR(ebut->button);
        int     movorb = MOVORB(ebut->state);
        int     oldnodesiz = qtMinNodesiz;
        Window  rootw, childw;
        int     rootx, rooty, wx, wy;
        unsigned int    statemask;

        qtMinNodesiz = 16;              /* for quicker update */
        XNoOp(ourdisplay);

        while (!XCheckMaskEvent(ourdisplay,
                        ButtonReleaseMask, levptr(XEvent))) {

                if (!XQueryPointer(ourdisplay, gwind, &rootw, &childw,
                                &rootx, &rooty, &wx, &wy, &statemask))
                        break;          /* on another screen */

                if (!moveview(wx, odev.vres-1-wy, movdir, movorb)) {
                        sleep(1);
                        continue;
                }
                XClearWindow(ourdisplay, gwind);
                qtUpdate();
                draw_grids();
        }
        if (!(inpresflags & DFL(DC_SETVIEW))) { /* do final motion */
                movdir = MOVDIR(levptr(XButtonReleasedEvent)->button);
                wx = levptr(XButtonReleasedEvent)->x;
                wy = levptr(XButtonReleasedEvent)->y;
                moveview(wx, odev.vres-1-wy, movdir, movorb);
        }
        dev_flush();

        qtMinNodesiz = oldnodesiz;      /* restore quadtree resolution */
}


static
getkey(ekey)                            /* get input key */
register XKeyPressedEvent  *ekey;
{
        int  n;
        char    buf[8];

        n = XLookupString(ekey, buf, sizeof(buf), NULL, NULL);
        if (n != 1)
                return;
        switch (buf[0]) {
        case 'h':                       /* turn on height motion lock */
                headlocked = 1;
                return;
        case 'H':                       /* turn off height motion lock */
                headlocked = 0;
                return;
        case 'l':                       /* retrieve last view */
                inpresflags |= DFL(DC_LASTVIEW);
                return;
        case 'p':                       /* pause computation */
                inpresflags |= DFL(DC_PAUSE);
                return;
        case 'v':                       /* spit out view */
                inpresflags |= DFL(DC_GETVIEW);
                return;
        case '\n':
        case '\r':                      /* resume computation */
                inpresflags |= DFL(DC_RESUME);
                return;
        case CTRL('R'):                 /* redraw screen */
                if (ncolors > 0)
                        new_ctab(ncolors);
                qtRedraw(0, 0, odev.hres, odev.vres);
                return;
        case CTRL('L'):                 /* refresh from server */
                if (inpresflags & DFL(DC_REDRAW))
                        return;
                XClearWindow(ourdisplay, gwind);
                draw_grids();
                XFlush(ourdisplay);
                qtCompost(100);                 /* unload the old tree */
                if (ncolors > 0)
                        new_ctab(ncolors);
                inpresflags |= DFL(DC_REDRAW);  /* resend values from server */
                rayqleft = 0;                   /* hold off update */
                return;
        case 'K':                       /* kill rtrace process(es) */
                inpresflags |= DFL(DC_KILL);
                break;
        case 'R':                       /* restart rtrace */
                inpresflags |= DFL(DC_RESTART);
                break;
        case 'C':                       /* clobber holodeck */
                inpresflags |= DFL(DC_CLOBBER);
                break;
        case 'q':                       /* quit the program */
                inpresflags |= DFL(DC_QUIT);
                return;
        default:
                XBell(ourdisplay, 0);
                return;
        }
}


static
fixwindow(eexp)                         /* repair damage to window */
register XExposeEvent  *eexp;
{
        if (odev.hres == 0 || odev.vres == 0) { /* first exposure */
                odev.hres = eexp->width;
                odev.vres = eexp->height;
        }
        qtRedraw(eexp->x, odev.vres - eexp->y - eexp->height,
                        eexp->x + eexp->width, odev.vres - eexp->y);
}


static
resizewindow(ersz)                      /* resize window */
register XConfigureEvent  *ersz;
{
        if (ersz->width == odev.hres && ersz->height == odev.vres)
                return;

        odev.hres = ersz->width;
        odev.vres = ersz->height;

        odev.v.horiz = 2.*180./PI * atan(0.5/VIEWDIST*pwidth*odev.hres);
        odev.v.vert = 2.*180./PI * atan(0.5/VIEWDIST*pheight*odev.vres);

        inpresflags |= DFL(DC_SETVIEW);
}
Revision:	3.26
Committed:	Wed Jun 17 15:44:07 1998 UTC (25 years, 10 months ago) by gwlarson
Content type:	text/plain
Branch:	MAIN
Changes since 3.25:	+9 -1 lines
Log Message:	added dev_auxcom() for auxiliary command handling
#	User	Rev	Content
1	gwlarson	3.26	/* Copyright (c) 1998 Silicon Graphics, Inc. */
2	gregl	3.1
3			#ifndef lint
4			static char SCCSid[] = "$SunId$ SGI";
5			#endif
6
7			/*
8			* X11 driver for holodeck display.
9			* Based on rview driver.
10			*/
11
12			#include "standard.h"
13			#include "rhd_qtree.h"
14
15			#include <X11/Xlib.h>
16			#include <X11/cursorfont.h>
17			#include <X11/Xutil.h>
18
19			#include "x11icon.h"
20
21	gregl	3.20	#ifndef RAYQLEN
22			#define RAYQLEN 50000 /* max. rays to queue before flush */
23			#endif
24
25	gregl	3.11	#ifndef FEQ
26			#define FEQ(a,b) ((a)-(b) <= FTINY && (a)-(b) >= -FTINY)
27			#endif
28
29	gregl	3.1	#define GAMMA 2.2 /* default gamma correction */
30
31	gregl	3.13	#define MOVPCT 7 /* percent distance to move /frame */
32	gregl	3.2	#define MOVDIR(b) ((b)==Button1 ? 1 : (b)==Button2 ? 0 : -1)
33	gregl	3.13	#define MOVDEG (-5) /* degrees to orbit CW/down /frame */
34			#define MOVORB(s) ((s)&ShiftMask ? 1 : (s)&ControlMask ? -1 : 0)
35	gregl	3.2
36	gregl	3.1	#define MINWIDTH 480 /* minimum graphics window width */
37			#define MINHEIGHT 400 /* minimum graphics window height */
38
39			#define VIEWDIST 356 /* assumed viewing distance (mm) */
40
41			#define BORWIDTH 5 /* border width */
42
43			#define ourscreen DefaultScreen(ourdisplay)
44			#define ourroot RootWindow(ourdisplay,ourscreen)
45			#define ourmask (StructureNotifyMask\|ExposureMask\|KeyPressMask\|\
46	gregl	3.2	ButtonPressMask\|ButtonReleaseMask)
47	gregl	3.1
48			#define levptr(etype) ((etype *)&currentevent)
49
50			struct driver odev; /* global device driver structure */
51
52			static XEvent currentevent; /* current event */
53
54			static int ncolors = 0; /* color table size */
55			static int mapped = 0; /* window is mapped? */
56			static unsigned long pixval = NULL; / allocated pixels */
57			static unsigned long ourblack=0, ourwhite=1;
58
59			static Display ourdisplay = NULL; / our display */
60			static XVisualInfo ourvinfo; /* our visual information */
61			static Window gwind = 0; /* our graphics window */
62			static GC ourgc = 0; /* our graphics context for drawing */
63			static Colormap ourmap = 0; /* our color map */
64
65			static double pwidth, pheight; /* pixel dimensions (mm) */
66
67			static int inpresflags; /* input result flags */
68
69	gregl	3.2	static int headlocked = 0; /* lock vertical motion */
70	gregl	3.1
71			static int getpixels(), xnewcolr(), freepixels(), resizewindow(),
72	gregl	3.2	getevent(), getkey(), moveview(), getmove(), fixwindow();
73	gregl	3.1	static unsigned long true_pixel();
74
75
76			static int
77			mytmflags() /* figure out tone mapping flags */
78			{
79			extern char *progname;
80			register char cp, tail;
81			/* find basic name */
82			for (cp = tail = progname; *cp; cp++)
83			if (*cp == '/')
84			tail = cp+1;
85			for (cp = tail; cp && cp != '.'; cp++)
86			;
87			if (cp-tail == 3 && !strncmp(tail, "x11", 3))
88	gregl	3.20	return(TM_F_CAMERA\|TM_F_NOSTDERR);
89	gregl	3.1	if (cp-tail == 4 && !strncmp(tail, "x11h", 4))
90	gregl	3.20	return(TM_F_HUMAN\|TM_F_NOSTDERR);
91	gregl	3.1	error(USER, "illegal driver name");
92			}
93
94
95			dev_open(id) /* initialize X11 driver */
96			char *id;
97			{
98			extern char *getenv();
99	gregl	3.24	static RGBPRIMS myprims = STDPRIMS;
100			char *ev;
101	gregl	3.1	double gamval = GAMMA;
102	gregl	3.24	RGBPRIMP dpri = stdprims;
103	gregl	3.1	int nplanes;
104			XSetWindowAttributes ourwinattr;
105			XWMHints ourxwmhints;
106			XSizeHints oursizhints;
107	gregl	3.2	/* set quadtree globals */
108	gregl	3.4	qtMinNodesiz = 2;
109	gregl	3.1	/* open display server */
110			ourdisplay = XOpenDisplay(NULL);
111			if (ourdisplay == NULL)
112			error(USER, "cannot open X-windows; DISPLAY variable set?\n");
113			/* find a usable visual */
114			nplanes = DisplayPlanes(ourdisplay, ourscreen);
115			if (XMatchVisualInfo(ourdisplay,ourscreen,
116			nplanes>12?nplanes:24,TrueColor,&ourvinfo) \|\|
117			XMatchVisualInfo(ourdisplay,ourscreen,
118			nplanes>12?nplanes:24,DirectColor,&ourvinfo)) {
119			ourblack = 0;
120			ourwhite = ourvinfo.red_mask \|
121			ourvinfo.green_mask \|
122			ourvinfo.blue_mask ;
123			} else {
124			if (nplanes < 4)
125			error(INTERNAL, "not enough colors\n");
126			if (!XMatchVisualInfo(ourdisplay,ourscreen,
127			nplanes,PseudoColor,&ourvinfo) &&
128			!XMatchVisualInfo(ourdisplay,ourscreen,
129			nplanes,GrayScale,&ourvinfo))
130			error(INTERNAL, "unsupported visual type\n");
131			ourblack = BlackPixel(ourdisplay,ourscreen);
132			ourwhite = WhitePixel(ourdisplay,ourscreen);
133			}
134			/* set gamma and tone mapping */
135	gregl	3.24	if ((ev = XGetDefault(ourdisplay, "radiance", "gamma")) != NULL
136			\|\| (ev = getenv("DISPLAY_GAMMA")) != NULL)
137			gamval = atof(ev);
138			if ((ev = getenv("DISPLAY_PRIMARIES")) != NULL &&
139			sscanf(ev, "%f %f %f %f %f %f %f %f",
140			&myprims[RED][CIEX],&myprims[RED][CIEY],
141			&myprims[GRN][CIEX],&myprims[GRN][CIEY],
142			&myprims[BLU][CIEX],&myprims[BLU][CIEY],
143			&myprims[WHT][CIEX],&myprims[WHT][CIEY]) >= 6)
144			dpri = myprims;
145			if (tmInit(mytmflags(), dpri, gamval) == NULL)
146	gregl	3.1	error(SYSTEM, "not enough memory in dev_open");
147			/* open window */
148			ourwinattr.background_pixel = ourblack;
149			ourwinattr.border_pixel = ourblack;
150			ourwinattr.event_mask = ourmask;
151			/* this is stupid */
152			ourwinattr.colormap = XCreateColormap(ourdisplay, ourroot,
153			ourvinfo.visual, AllocNone);
154			gwind = XCreateWindow(ourdisplay, ourroot, 0, 0,
155			DisplayWidth(ourdisplay,ourscreen)-2*BORWIDTH,
156			DisplayHeight(ourdisplay,ourscreen)-2*BORWIDTH,
157			BORWIDTH, ourvinfo.depth, InputOutput, ourvinfo.visual,
158			CWBackPixel\|CWBorderPixel\|CWColormap\|CWEventMask, &ourwinattr);
159			if (gwind == 0)
160			error(SYSTEM, "cannot create window\n");
161			XStoreName(ourdisplay, gwind, id);
162			/* get graphics context */
163			ourgc = XCreateGC(ourdisplay, gwind, 0, NULL);
164			/* set window manager hints */
165			ourxwmhints.flags = InputHint\|IconPixmapHint;
166			ourxwmhints.input = True;
167			ourxwmhints.icon_pixmap = XCreateBitmapFromData(ourdisplay,
168			gwind, x11icon_bits, x11icon_width, x11icon_height);
169			XSetWMHints(ourdisplay, gwind, &ourxwmhints);
170			oursizhints.min_width = MINWIDTH;
171			oursizhints.min_height = MINHEIGHT;
172			oursizhints.flags = PMinSize;
173			XSetNormalHints(ourdisplay, gwind, &oursizhints);
174	gregl	3.18	/* figure out sensible view */
175			pwidth = (double)DisplayWidthMM(ourdisplay, ourscreen) /
176			DisplayWidth(ourdisplay, ourscreen);
177			pheight = (double)DisplayHeightMM(ourdisplay, ourscreen) /
178			DisplayHeight(ourdisplay, ourscreen);
179			copystruct(&odev.v, &stdview);
180			odev.v.type = VT_PER;
181	gregl	3.1	/* map the window and get its size */
182			XMapWindow(ourdisplay, gwind);
183	gregl	3.18	dev_input(); /* sets size and view angles */
184	gregl	3.2	/* allocate our leaf pile */
185			if (!qtAllocLeaves(DisplayWidth(ourdisplay,ourscreen) *
186	gregl	3.21	DisplayHeight(ourdisplay,ourscreen) * 3 /
187			(qtMinNodesizqtMinNodesiz2)))
188	gregl	3.2	error(SYSTEM, "insufficient memory for leaf storage");
189	gregl	3.1	odev.name = id;
190			odev.ifd = ConnectionNumber(ourdisplay);
191			}
192
193
194			dev_close() /* close our display */
195			{
196			freepixels();
197			XFreeGC(ourdisplay, ourgc);
198			XDestroyWindow(ourdisplay, gwind);
199			gwind = 0;
200			ourgc = 0;
201			XCloseDisplay(ourdisplay);
202			ourdisplay = NULL;
203			qtFreeLeaves();
204			tmDone(NULL);
205			odev.v.type = 0;
206			odev.hres = odev.vres = 0;
207			odev.ifd = -1;
208			}
209
210
211	gregl	3.23
212			dev_clear() /* clear our quadtree */
213			{
214			qtCompost(100);
215			if (ncolors > 0)
216			new_ctab(ncolors);
217			rayqleft = 0; /* hold off update */
218			}
219
220
221	gregl	3.13	int
222	gregl	3.1	dev_view(nv) /* assign new driver view */
223			VIEW *nv;
224			{
225	gregl	3.13	if (nv->type == VT_PAR \|\| /* check view legality */
226	gregl	3.17	nv->horiz > 160. \|\| nv->vert > 160.) {
227	gregl	3.13	error(COMMAND, "illegal view type/angle");
228			nv->type = VT_PER;
229			nv->horiz = odev.v.horiz;
230			nv->vert = odev.v.vert;
231			return(0);
232			}
233			if (nv->vfore > FTINY) {
234			error(COMMAND, "cannot handle fore clipping");
235			nv->vfore = 0.;
236			return(0);
237			}
238	gregl	3.11	if (nv != &odev.v) {
239			if (!FEQ(nv->horiz,odev.v.horiz) \|\| /* resize window? */
240			!FEQ(nv->vert,odev.v.vert)) {
241	gregl	3.13	int dw = DisplayWidth(ourdisplay,ourscreen);
242			int dh = DisplayHeight(ourdisplay,ourscreen);
243
244			dw -= 25; /* for window frame */
245	gregl	3.16	dh -= 50;
246	gregl	3.12	odev.hres = 2.VIEWDIST/pwidth
247			tan(PI/180./2.*nv->horiz);
248			odev.vres = 2.VIEWDIST/pheight
249			tan(PI/180./2.*nv->vert);
250	gregl	3.13	if (odev.hres > dw) {
251			odev.vres = dw * odev.vres / odev.hres;
252			odev.hres = dw;
253			}
254			if (odev.vres > dh) {
255			odev.hres = dh * odev.hres / odev.vres;
256			odev.vres = dh;
257			}
258	gregl	3.11	XResizeWindow(ourdisplay, gwind, odev.hres, odev.vres);
259	gregl	3.18	dev_input(); /* wait for resize event */
260	gregl	3.11	}
261	gregl	3.1	copystruct(&odev.v, nv);
262	gregl	3.11	}
263	gregl	3.1	qtReplant();
264	gregl	3.13	return(1);
265	gwlarson	3.26	}
266
267
268			dev_auxcom(cmd, args) /* process an auxiliary command */
269			char cmd, args;
270			{
271			sprintf(errmsg, "%s: unknown command", cmd);
272			error(COMMAND, errmsg);
273	gregl	3.1	}
274
275
276	gwlarson	3.25	VIEW *
277			dev_auxview(n, hvres) /* return nth auxiliary view */
278			int n;
279			int hvres[2];
280			{
281			if (n)
282			return(NULL);
283			hvres[0] = odev.hres; hvres[1] = odev.vres;
284			return(&odev.v);
285			}
286
287
288	gregl	3.1	int
289			dev_input() /* get X11 input */
290			{
291			inpresflags = 0;
292	gregl	3.5
293	gregl	3.1	do
294			getevent();
295
296			while (XQLength(ourdisplay) > 0);
297
298			return(inpresflags);
299			}
300
301
302			dev_paintr(rgb, xmin, ymin, xmax, ymax) /* fill a rectangle */
303			BYTE rgb[3];
304			int xmin, ymin, xmax, ymax;
305			{
306			unsigned long pixel;
307
308			if (!mapped)
309			return;
310			if (ncolors > 0)
311			pixel = pixval[get_pixel(rgb, xnewcolr)];
312			else
313			pixel = true_pixel(rgb);
314			XSetForeground(ourdisplay, ourgc, pixel);
315			XFillRectangle(ourdisplay, gwind,
316			ourgc, xmin, odev.vres-ymax, xmax-xmin, ymax-ymin);
317			}
318
319
320			int
321			dev_flush() /* flush output */
322			{
323			qtUpdate();
324	gregl	3.20	rayqleft = RAYQLEN;
325	gregl	3.1	return(XPending(ourdisplay));
326			}
327
328
329			static
330			xnewcolr(ndx, r, g, b) /* enter a color into hardware table */
331			int ndx;
332			int r, g, b;
333			{
334			XColor xcolor;
335
336			xcolor.pixel = pixval[ndx];
337			xcolor.red = r << 8;
338			xcolor.green = g << 8;
339			xcolor.blue = b << 8;
340			xcolor.flags = DoRed\|DoGreen\|DoBlue;
341
342			XStoreColor(ourdisplay, ourmap, &xcolor);
343			}
344
345
346			static int
347			getpixels() /* get the color map */
348			{
349			XColor thiscolor;
350			register int i, j;
351
352			if (ncolors > 0)
353			return(ncolors);
354			if (ourvinfo.visual == DefaultVisual(ourdisplay,ourscreen)) {
355			ourmap = DefaultColormap(ourdisplay,ourscreen);
356			goto loop;
357			}
358			newmap:
359			ourmap = XCreateColormap(ourdisplay,gwind,ourvinfo.visual,AllocNone);
360			loop:
361			for (ncolors = ourvinfo.colormap_size;
362			ncolors > ourvinfo.colormap_size/3;
363			ncolors = ncolors*.937) {
364			pixval = (unsigned long )malloc(ncolorssizeof(unsigned long));
365			if (pixval == NULL)
366			return(ncolors = 0);
367			if (XAllocColorCells(ourdisplay,ourmap,0,NULL,0,pixval,ncolors))
368			break;
369			free((char *)pixval);
370			pixval = NULL;
371			}
372			if (pixval == NULL) {
373			if (ourmap == DefaultColormap(ourdisplay,ourscreen))
374			goto newmap; /* try it with our map */
375			else
376			return(ncolors = 0); /* failed */
377			}
378			if (ourmap != DefaultColormap(ourdisplay,ourscreen))
379			for (i = 0; i < ncolors; i++) { /* reset black and white */
380			if (pixval[i] != ourblack && pixval[i] != ourwhite)
381			continue;
382			thiscolor.pixel = pixval[i];
383			thiscolor.flags = DoRed\|DoGreen\|DoBlue;
384			XQueryColor(ourdisplay,
385			DefaultColormap(ourdisplay,ourscreen),
386			&thiscolor);
387			XStoreColor(ourdisplay, ourmap, &thiscolor);
388			for (j = i; j+1 < ncolors; j++)
389			pixval[j] = pixval[j+1];
390			ncolors--;
391			i--;
392			}
393			XSetWindowColormap(ourdisplay, gwind, ourmap);
394			return(ncolors);
395			}
396
397
398			static
399			freepixels() /* free our pixels */
400			{
401			if (ncolors == 0)
402			return;
403			XFreeColors(ourdisplay,ourmap,pixval,ncolors,0L);
404			free((char *)pixval);
405			pixval = NULL;
406			ncolors = 0;
407			if (ourmap != DefaultColormap(ourdisplay,ourscreen))
408			XFreeColormap(ourdisplay, ourmap);
409			ourmap = 0;
410			}
411
412
413			static unsigned long
414			true_pixel(rgb) /* return true pixel value for color */
415			register BYTE rgb[3];
416			{
417			register unsigned long rval;
418
419			rval = ourvinfo.red_mask*rgb[RED]/255 & ourvinfo.red_mask;
420			rval \|= ourvinfo.green_mask*rgb[GRN]/255 & ourvinfo.green_mask;
421			rval \|= ourvinfo.blue_mask*rgb[BLU]/255 & ourvinfo.blue_mask;
422			return(rval);
423			}
424
425
426			static
427			getevent() /* get next event */
428			{
429			XNextEvent(ourdisplay, levptr(XEvent));
430			switch (levptr(XEvent)->type) {
431			case ConfigureNotify:
432			resizewindow(levptr(XConfigureEvent));
433			break;
434			case UnmapNotify:
435			mapped = 0;
436			freepixels();
437			break;
438			case MapNotify:
439			if (ourvinfo.class == PseudoColor \|\|
440			ourvinfo.class == GrayScale) {
441			if (getpixels() == 0)
442			error(SYSTEM, "cannot allocate colors\n");
443			new_ctab(ncolors);
444			}
445			mapped = 1;
446			break;
447			case Expose:
448			fixwindow(levptr(XExposeEvent));
449			break;
450			case KeyPress:
451			getkey(levptr(XKeyPressedEvent));
452			break;
453			case ButtonPress:
454	gregl	3.2	getmove(levptr(XButtonPressedEvent));
455	gregl	3.1	break;
456			}
457			}
458
459
460			static
461	gregl	3.9	ilclip(dp, wp) /* clip world coordinates to device */
462			int dp[2][2];
463			FVECT wp[2];
464			{
465			static FVECT vmin = {0.,0.,0.}, vmax = {1.,1.,FHUGE};
466			FVECT ip[2];
467			/* not exactly right, but who cares? */
468			viewloc(ip[0], &odev.v, wp[0]);
469			viewloc(ip[1], &odev.v, wp[1]);
470			if (!clip(ip[0], ip[1], vmin, vmax))
471			return(0);
472			dp[0][0] = ip[0][0]*odev.hres;
473			dp[0][1] = ip[0][1]*odev.vres;
474			dp[1][0] = ip[1][0]*odev.hres;
475			dp[1][1] = ip[1][1]*odev.vres;
476			return(1);
477			}
478
479
480			static
481			draw3dline(wp) /* draw 3d line in world coordinates */
482			FVECT wp[2];
483			{
484			int dp[2][2];
485
486			if (!ilclip(dp, wp))
487			return;
488			XDrawLine(ourdisplay, gwind, ourgc,
489			dp[0][0], odev.vres-1 - dp[0][1],
490			dp[1][0], odev.vres-1 - dp[1][1]);
491			}
492
493
494			static
495			draw_grids() /* draw holodeck section grids */
496			{
497			static BYTE gridrgb[3] = {0x0, 0xff, 0xff};
498			unsigned long pixel;
499
500	gregl	3.19	if (!mapped)
501	gregl	3.9	return;
502			if (ncolors > 0)
503			pixel = pixval[get_pixel(gridrgb, xnewcolr)];
504			else
505			pixel = true_pixel(gridrgb);
506			XSetForeground(ourdisplay, ourgc, pixel);
507			/* draw each grid line */
508			gridlines(draw3dline);
509			}
510
511
512			static
513	gregl	3.13	moveview(dx, dy, mov, orb) /* move our view */
514			int dx, dy, mov, orb;
515	gregl	3.2	{
516			VIEW nv;
517	gregl	3.17	FVECT odir, v1;
518	gregl	3.2	double d;
519	gregl	3.13	register int li;
520	gregl	3.2	/* start with old view */
521			copystruct(&nv, &odev.v);
522			/* change view direction */
523	gregl	3.13	if (mov \| orb) {
524	gregl	3.4	if ((li = qtFindLeaf(dx, dy)) < 0)
525	gregl	3.2	return(0); /* not on window */
526	gregl	3.17	VSUM(odir, qtL.wp[li], nv.vp, -1.);
527	gregl	3.2	} else {
528			if (viewray(nv.vp, nv.vdir, &odev.v,
529			(dx+.5)/odev.hres, (dy+.5)/odev.vres) < -FTINY)
530			return(0); /* outside view */
531			}
532	gregl	3.13	if (orb && mov) { /* orbit left/right */
533	gregl	3.17	spinvector(odir, odir, nv.vup, d=MOVDEGPI/180.mov);
534			VSUM(nv.vp, qtL.wp[li], odir, -1.);
535			spinvector(nv.vdir, nv.vdir, nv.vup, d);
536	gregl	3.13	} else if (orb) { /* orbit up/down */
537	gregl	3.17	fcross(v1, odir, nv.vup);
538	gregl	3.13	if (normalize(v1) == 0.)
539			return(0);
540	gregl	3.17	spinvector(odir, odir, v1, d=MOVDEGPI/180.orb);
541			VSUM(nv.vp, qtL.wp[li], odir, -1.);
542			spinvector(nv.vdir, nv.vdir, v1, d);
543	gregl	3.13	} else if (mov) { /* move forward/backward */
544			d = MOVPCT/100. * mov;
545	gregl	3.17	VSUM(nv.vp, nv.vp, odir, d);
546	gregl	3.2	}
547	gregl	3.13	if (!mov ^ !orb && headlocked) { /* restore head height */
548			VSUM(v1, odev.v.vp, nv.vp, -1.);
549			d = DOT(v1, odev.v.vup);
550			VSUM(nv.vp, nv.vp, odev.v.vup, d);
551			}
552	gregl	3.2	if (setview(&nv) != NULL)
553			return(0); /* illegal view */
554			dev_view(&nv);
555	gregl	3.14	inpresflags \|= DFL(DC_SETVIEW);
556	gregl	3.2	return(1);
557			}
558
559
560			static
561			getmove(ebut) /* get view change */
562			XButtonPressedEvent *ebut;
563			{
564	gregl	3.13	int movdir = MOVDIR(ebut->button);
565			int movorb = MOVORB(ebut->state);
566	gregl	3.2	int oldnodesiz = qtMinNodesiz;
567			Window rootw, childw;
568			int rootx, rooty, wx, wy;
569			unsigned int statemask;
570
571			qtMinNodesiz = 16; /* for quicker update */
572	gregl	3.9	XNoOp(ourdisplay);
573	gregl	3.2
574	gregl	3.9	while (!XCheckMaskEvent(ourdisplay,
575			ButtonReleaseMask, levptr(XEvent))) {
576
577	gregl	3.2	if (!XQueryPointer(ourdisplay, gwind, &rootw, &childw,
578			&rootx, &rooty, &wx, &wy, &statemask))
579			break; /* on another screen */
580
581	gregl	3.13	if (!moveview(wx, odev.vres-1-wy, movdir, movorb)) {
582	gregl	3.2	sleep(1);
583	gregl	3.9	continue;
584			}
585			XClearWindow(ourdisplay, gwind);
586			qtUpdate();
587			draw_grids();
588			}
589	gregl	3.14	if (!(inpresflags & DFL(DC_SETVIEW))) { /* do final motion */
590	gregl	3.13	movdir = MOVDIR(levptr(XButtonReleasedEvent)->button);
591	gregl	3.2	wx = levptr(XButtonReleasedEvent)->x;
592			wy = levptr(XButtonReleasedEvent)->y;
593	gregl	3.13	moveview(wx, odev.vres-1-wy, movdir, movorb);
594	gregl	3.2	}
595	gregl	3.9	dev_flush();
596	gregl	3.2
597			qtMinNodesiz = oldnodesiz; /* restore quadtree resolution */
598			}
599
600
601			static
602	gregl	3.1	getkey(ekey) /* get input key */
603			register XKeyPressedEvent *ekey;
604			{
605			int n;
606			char buf[8];
607
608			n = XLookupString(ekey, buf, sizeof(buf), NULL, NULL);
609			if (n != 1)
610			return;
611			switch (buf[0]) {
612			case 'h': /* turn on height motion lock */
613	gregl	3.2	headlocked = 1;
614	gregl	3.1	return;
615			case 'H': /* turn off height motion lock */
616	gregl	3.2	headlocked = 0;
617	gregl	3.13	return;
618			case 'l': /* retrieve last view */
619	gregl	3.14	inpresflags \|= DFL(DC_LASTVIEW);
620	gregl	3.1	return;
621	gregl	3.2	case 'p': /* pause computation */
622	gregl	3.14	inpresflags \|= DFL(DC_PAUSE);
623	gregl	3.2	return;
624	gregl	3.7	case 'v': /* spit out view */
625	gregl	3.14	inpresflags \|= DFL(DC_GETVIEW);
626	gregl	3.7	return;
627	gregl	3.2	case '\n':
628	gregl	3.5	case '\r': /* resume computation */
629	gregl	3.14	inpresflags \|= DFL(DC_RESUME);
630	gregl	3.2	return;
631	gregl	3.7	case CTRL('R'): /* redraw screen */
632			if (ncolors > 0)
633			new_ctab(ncolors);
634			qtRedraw(0, 0, odev.hres, odev.vres);
635			return;
636			case CTRL('L'): /* refresh from server */
637	gregl	3.14	if (inpresflags & DFL(DC_REDRAW))
638	gregl	3.8	return;
639	gregl	3.7	XClearWindow(ourdisplay, gwind);
640	gregl	3.9	draw_grids();
641	gregl	3.8	XFlush(ourdisplay);
642	gregl	3.6	qtCompost(100); /* unload the old tree */
643	gregl	3.3	if (ncolors > 0)
644			new_ctab(ncolors);
645	gregl	3.14	inpresflags \|= DFL(DC_REDRAW); /* resend values from server */
646	gregl	3.22	rayqleft = 0; /* hold off update */
647	gregl	3.3	return;
648	gregl	3.15	case 'K': /* kill rtrace process(es) */
649			inpresflags \|= DFL(DC_KILL);
650			break;
651			case 'R': /* restart rtrace */
652			inpresflags \|= DFL(DC_RESTART);
653			break;
654			case 'C': /* clobber holodeck */
655			inpresflags \|= DFL(DC_CLOBBER);
656			break;
657	gregl	3.1	case 'q': /* quit the program */
658	gregl	3.14	inpresflags \|= DFL(DC_QUIT);
659	gregl	3.1	return;
660			default:
661			XBell(ourdisplay, 0);
662			return;
663			}
664			}
665
666
667			static
668			fixwindow(eexp) /* repair damage to window */
669			register XExposeEvent *eexp;
670			{
671			if (odev.hres == 0 \|\| odev.vres == 0) { /* first exposure */
672			odev.hres = eexp->width;
673			odev.vres = eexp->height;
674			}
675			qtRedraw(eexp->x, odev.vres - eexp->y - eexp->height,
676			eexp->x + eexp->width, odev.vres - eexp->y);
677			}
678
679
680			static
681			resizewindow(ersz) /* resize window */
682			register XConfigureEvent *ersz;
683			{
684			if (ersz->width == odev.hres && ersz->height == odev.vres)
685			return;
686
687			odev.hres = ersz->width;
688			odev.vres = ersz->height;
689
690	gregl	3.12	odev.v.horiz = 2.180./PI atan(0.5/VIEWDISTpwidthodev.hres);
691			odev.v.vert = 2.180./PI atan(0.5/VIEWDISTpheightodev.vres);
692
693	gregl	3.14	inpresflags \|= DFL(DC_SETVIEW);
694	gregl	3.1	}