src/hd/rhd_glx.c

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

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

/*
 * OpenGL GLX driver for holodeck display.
 * Based on x11 driver.
 */

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

#include  <GL/glx.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

#ifndef MAXCONE
#define MAXCONE         16              /* number of different cone sizes */
#endif
#ifndef MAXVERT
#define MAXVERT         64              /* maximum number of cone vertices */
#endif
#ifndef MINVERT
#define MINVERT         4               /* minimum number of cone vertices */
#endif
#ifndef DEPTHFACT
#define DEPTHFACT       16.             /* multiplier for depth tests */
#endif

#define GAMMA           1.4             /* 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  mapped = 0;                 /* window is mapped? */
static unsigned long  ourblack=0, ourwhite=~0;

static Display  *ourdisplay = NULL;     /* our display */
static XVisualInfo  *ourvinf;           /* our visual information */
static Window  gwind = 0;               /* our graphics window */
static GLXContext       gctx;           /* our GLX context */

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

static double   curzmax = 1e4;          /* current depth upper limit */
static double   nxtzmax = 0.;           /* maximum (finite) depth so far */

static struct {
        double  rad;            /* cone radius */
        int     nverts;         /* number of vertices */
        FVECT   *va;            /* allocated vertex array */
} cone[MAXCONE];        /* precomputed cones for drawing */

static int      inpresflags;            /* input result flags */

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

static int  resizewindow(), getevent(), getkey(), moveview(),
                initcones(), freecones(),
                getmove(), fixwindow(), mytmflags();


dev_open(id)                    /* initialize X11 driver */
char  *id;
{
        extern char     *getenv();
        static RGBPRIMS myprims = STDPRIMS;
        static int      atlBest[] = {GLX_RGBA, GLX_RED_SIZE,8,
                                GLX_GREEN_SIZE,8, GLX_BLUE_SIZE,8,
                                GLX_DEPTH_SIZE,15, None};
        char    *ev;
        double  gamval = GAMMA;
        RGBPRIMP        dpri = stdprims;
        XSetWindowAttributes    ourwinattr;
        XWMHints        ourxwmhints;
        XSizeHints      oursizhints;
                                        /* set quadtree globals */
        qtMinNodesiz = 3;
        qtDepthEps = 0.07;
                                        /* open display server */
        ourdisplay = XOpenDisplay(NULL);
        if (ourdisplay == NULL)
                error(USER, "cannot open X-windows; DISPLAY variable set?\n");
                                        /* find a usable visual */
        ourvinf = glXChooseVisual(ourdisplay, ourscreen, atlBest);
        if (ourvinf == NULL)
                error(USER, "no suitable visuals available");
                                        /* get a context */
        gctx = glXCreateContext(ourdisplay, ourvinf, NULL, GL_TRUE);
                                        /* 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,
                                ourvinf->visual, AllocNone);
        gwind = XCreateWindow(ourdisplay, ourroot, 0, 0,
                DisplayWidth(ourdisplay,ourscreen)-2*BORWIDTH,
                DisplayHeight(ourdisplay,ourscreen)-2*BORWIDTH,
                BORWIDTH, ourvinf->depth, InputOutput, ourvinf->visual,
                CWBackPixel|CWBorderPixel|CWColormap|CWEventMask, &ourwinattr);
        if (gwind == 0)
                error(SYSTEM, "cannot create window\n");
        XStoreName(ourdisplay, gwind, id);
                                        /* 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);
                                        /* set GLX context */
        glXMakeCurrent(ourdisplay, gwind, gctx);
        glEnable(GL_DEPTH_TEST);
        glDepthFunc(GL_LEQUAL);
        glShadeModel(GL_FLAT);
        glDisable(GL_DITHER);
        glDisable(GL_CULL_FACE);
        glMatrixMode(GL_PROJECTION);
        glOrtho(0., 1., 0., 1., -.01, 1.01);
        glTranslated(0., 0., -1.01);
                                        /* 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 */
        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 value storage");
        odev.name = id;
        odev.ifd = ConnectionNumber(ourdisplay);
                                        /* initialize cone array */
        initcones();
}


dev_close()                     /* close our display and free resources */
{
        glXMakeCurrent(ourdisplay, None, NULL);
        glXDestroyContext(ourdisplay, gctx);
        XDestroyWindow(ourdisplay, gwind);
        gwind = 0;
        XCloseDisplay(ourdisplay);
        ourdisplay = NULL;
        qtFreeLeaves();
        tmDone(NULL);
        freecones();
        odev.v.type = 0;
        odev.hres = odev.vres = 0;
        odev.ifd = -1;
}


dev_clear()                     /* clear our quadtree */
{
        qtCompost(100);
        glClear(GL_DEPTH_BUFFER_BIT);
        rayqleft = 0;                   /* hold off update */
}


int
dev_view(nv)                    /* assign new driver view */
register VIEW   *nv;
{
        if (nv->type == VT_PAR ||               /* check view legality */
                        nv->horiz > 160. || nv->vert > 160.) {
                error(COMMAND, "illegal view type/angle");
                nv->type = odev.v.type;
                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();    /* get resize event */
                }
                copystruct(&odev.v, nv);
        }
        if (nxtzmax > FTINY) {
                curzmax = nxtzmax;
                nxtzmax = 0.;
        }
        glClear(GL_DEPTH_BUFFER_BIT);
        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);
}


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


dev_cone(rgb, ip, rad)          /* render a cone in view coordinates */
BYTE    rgb[3];
FVECT   ip;
double  rad;
{
        register int    ci, j;
        double  apexh, basez;
                                        /* is window mapped? */
        if (!mapped)
                return;
                                        /* compute apex height (0. to 1.) */
        if (ip[2] > 1e6)
                apexh = 1. - 1./DEPTHFACT;
        else {
                if (ip[2] > nxtzmax)
                        nxtzmax = ip[2];
                if (ip[2] >= curzmax)
                        apexh = 1. - 1./DEPTHFACT;
                else
                        apexh = 1. - ip[2]/(curzmax*DEPTHFACT);
        }
        rad *= 1.25;                    /* find conservative cone match */
        for (ci = 0; ci < MAXCONE-1; ci++)
                if (cone[ci].rad >= rad)
                        break;
                                        /* draw it */
        glColor3ub(rgb[0], rgb[1], rgb[2]);
        glBegin(GL_TRIANGLE_FAN);
        glVertex3d(ip[0], ip[1], apexh);        /* start with apex */
        basez = apexh*cone[ci].va[0][2];        /* base z's all the same */
        for (j = 0; j < cone[ci].nverts; j++)   /* draw each face */
                glVertex3d(ip[0]+cone[ci].va[j][0], ip[1]+cone[ci].va[j][1],
                                basez);
                                                /* connect last to first */
        glVertex3d(ip[0]+cone[ci].va[0][0], ip[1]+cone[ci].va[0][1], basez);
        glEnd();                                /* all done */
}


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, "glx", 3))
                return(TM_F_CAMERA|TM_F_NOSTDERR);
        if (cp-tail == 4 && !strncmp(tail, "glxh", 4))
                return(TM_F_HUMAN|TM_F_NOSTDERR);
        error(USER, "illegal driver name");
}


static
initcones()                     /* initialize cone vertices */
{
        register int    i, j;
        double  minrad, d;

        if (cone[0].nverts)
                freecones();
        minrad = 2.*qtMinNodesiz/(double)(DisplayWidth(ourdisplay,ourscreen) +
                                        DisplayHeight(ourdisplay,ourscreen));
        for (i = 0; i < MAXCONE; i++) {
                d = (double)i/(MAXCONE-1); d *= d;      /* x^2 distribution */
                cone[i].rad = minrad + (1.-minrad)*d;
                cone[i].nverts = MINVERT + 0.5 + (MAXVERT-MINVERT)*d;
                cone[i].va = (FVECT *)malloc(cone[i].nverts*sizeof(FVECT));
                if (cone[i].va == NULL)
                        error(SYSTEM, "out of memory in initcones");
                for (j = cone[i].nverts; j--; ) {
                        d = 2.*PI * (j+.5) / (cone[i].nverts);
                        cone[i].va[j][0] = cos(d) * cone[i].rad;
                        cone[i].va[j][1] = sin(d) * cone[i].rad;
                        cone[i].va[j][2] = 1. - cone[i].rad;
                }
        }
}


static
freecones()                     /* free cone vertices */
{
        register int    i;

        for (i = MAXCONE; i--; )
                if (cone[i].nverts) {
                        free((char *)cone[i].va);
                        cone[i].va = NULL;
                        cone[i].nverts = 0;
                }
}


static
getevent()                      /* get next event */
{
        XNextEvent(ourdisplay, levptr(XEvent));
        switch (levptr(XEvent)->type) {
        case ConfigureNotify:
                resizewindow(levptr(XConfigureEvent));
                break;
        case UnmapNotify:
                mapped = 0;
                break;
        case MapNotify:
                mapped = 1;
                break;
        case Expose:
                fixwindow(levptr(XExposeEvent));
                break;
        case KeyPress:
                getkey(levptr(XKeyPressedEvent));
                break;
        case ButtonPress:
                getmove(levptr(XButtonPressedEvent));
                break;
        }
}


static
draw3dline(wp)                  /* draw 3d line in world coordinates */
register FVECT  wp[2];
{
        glVertex3d(wp[0][0], wp[0][1], wp[0][2]);
        glVertex3d(wp[1][0], wp[1][1], wp[1][2]);
}


static
draw_grids()                    /* draw holodeck section grids */
{
        static BYTE     gridrgba[4] = {0x0, 0xff, 0xff, 0x00};
        double  xmin, xmax, ymin, ymax, zmin, zmax;
        double  d, cx, sx, crad;
        FVECT   vx, vy;
        register int    i, j;
                                        /* can we even do it? */
        if (!mapped || odev.v.type != VT_PER)
                return;
                                        /* compute view frustum */
        if (normalize(odev.v.vdir) == 0.0)
                return;
        zmin = 0.01;
        zmax = 10000.;
        if (odev.v.vfore > FTINY)
                zmin = odev.v.vfore;
        if (odev.v.vaft > FTINY)
                zmax = odev.v.vaft;
        xmax = zmin * tan(PI/180./2. * odev.v.horiz);
        xmin = -xmax;
        d = odev.v.hoff * (xmax - xmin);
        xmin += d; xmax += d;
        ymax = zmin * tan(PI/180./2. * odev.v.vert);
        ymin = -ymax;
        d = odev.v.voff * (ymax - ymin);
        ymin += d; ymax += d;
                                        /* set view matrix */
        glMatrixMode(GL_PROJECTION);
        glPushMatrix();
        glLoadIdentity();
        glFrustum(xmin, xmax, ymin, ymax, zmin, zmax);
        gluLookAt(odev.v.vp[0], odev.v.vp[1], odev.v.vp[2],
                odev.v.vp[0] + odev.v.vdir[0],
                odev.v.vp[1] + odev.v.vdir[1],
                odev.v.vp[2] + odev.v.vdir[2],
                odev.v.vup[0], odev.v.vup[1], odev.v.vup[2]);
        glDisable(GL_DEPTH_TEST);       /* write no depth values */
        glColor4ub(gridrgba[0], gridrgba[1], gridrgba[2], gridrgba[3]);
        glBegin(GL_LINES);              /* draw each grid line */
        gridlines(draw3dline);
        glEnd();
        glEnable(GL_DEPTH_TEST);        /* restore rendering params */
        glPopMatrix();
}


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 = 24;              /* accelerate update rate */
        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;
                }
                glClear(GL_COLOR_BUFFER_BIT);
                qtUpdate();
                draw_grids();
                glFlush();
        }
        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 (nxtzmax > FTINY) {
                        curzmax = nxtzmax;
                        nxtzmax = 0.;
                }
                glClear(GL_DEPTH_BUFFER_BIT);
                qtRedraw(0, 0, odev.hres, odev.vres);
                return;
        case CTRL('L'):                 /* refresh from server */
                if (inpresflags & DFL(DC_REDRAW))
                        return;
                if (nxtzmax > FTINY) {
                        curzmax = nxtzmax;
                        nxtzmax = 0.;
                }
                glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
                draw_grids();
                glFlush();
                qtCompost(100);                 /* get rid of old values */
                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;
{
        int     xmin, xmax, ymin, ymax;

        if (odev.hres == 0 || odev.vres == 0)   /* first exposure */
                resizewindow((XConfigureEvent *)eexp);
        xmin = eexp->x; xmax = eexp->x + eexp->width;
        ymin = odev.vres - eexp->y - eexp->height; ymax = odev.vres - eexp->y;
                                                /* clear portion of depth */
        glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
        glDepthFunc(GL_ALWAYS);
        glBegin(GL_POLYGON);
        glVertex3d((double)xmin/odev.hres, (double)ymin/odev.vres, 0.);
        glVertex3d((double)xmax/odev.hres, (double)ymin/odev.vres, 0.);
        glVertex3d((double)xmax/odev.hres, (double)ymax/odev.vres, 0.);
        glVertex3d((double)xmin/odev.hres, (double)ymax/odev.vres, 0.);
        glEnd();
        glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
        glDepthFunc(GL_LEQUAL);
        qtRedraw(xmin, ymin, xmax, ymax);
}


static
resizewindow(ersz)                      /* resize window */
register XConfigureEvent  *ersz;
{
        glViewport(0, 0, ersz->width, ersz->height);

        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:	3.18
Committed:	Wed Jun 17 15:44:07 1998 UTC (25 years, 10 months ago) by gwlarson
Content type:	text/plain
Branch:	MAIN
Changes since 3.17:	+9 -1 lines
Log Message:	added dev_auxcom() for auxiliary command handling
#	User	Rev	Content
1	gwlarson	3.18	/* Copyright (c) 1998 Silicon Graphics, Inc. */
2	gregl	3.1
3			#ifndef lint
4			static char SCCSid[] = "$SunId$ SGI";
5			#endif
6
7			/*
8			* OpenGL GLX driver for holodeck display.
9	gregl	3.2	* Based on x11 driver.
10	gregl	3.1	*/
11
12			#include "standard.h"
13	gregl	3.4	#include "rhd_qtree.h"
14	gregl	3.1
15			#include <GL/glx.h>
16
17			#include "x11icon.h"
18
19	gregl	3.10	#ifndef RAYQLEN
20			#define RAYQLEN 50000 /* max. rays to queue before flush */
21			#endif
22
23	gregl	3.1	#ifndef FEQ
24			#define FEQ(a,b) ((a)-(b) <= FTINY && (a)-(b) >= -FTINY)
25			#endif
26
27	gregl	3.4	#ifndef MAXCONE
28			#define MAXCONE 16 /* number of different cone sizes */
29	gregl	3.1	#endif
30	gregl	3.4	#ifndef MAXVERT
31	gregl	3.16	#define MAXVERT 64 /* maximum number of cone vertices */
32	gregl	3.1	#endif
33	gregl	3.4	#ifndef MINVERT
34			#define MINVERT 4 /* minimum number of cone vertices */
35	gregl	3.1	#endif
36	gregl	3.4	#ifndef DEPTHFACT
37			#define DEPTHFACT 16. /* multiplier for depth tests */
38	gregl	3.1	#endif
39
40	gregl	3.2	#define GAMMA 1.4 /* default gamma correction */
41	gregl	3.1
42			#define MOVPCT 7 /* percent distance to move /frame */
43			#define MOVDIR(b) ((b)==Button1 ? 1 : (b)==Button2 ? 0 : -1)
44			#define MOVDEG (-5) /* degrees to orbit CW/down /frame */
45			#define MOVORB(s) ((s)&ShiftMask ? 1 : (s)&ControlMask ? -1 : 0)
46
47			#define MINWIDTH 480 /* minimum graphics window width */
48			#define MINHEIGHT 400 /* minimum graphics window height */
49
50			#define VIEWDIST 356 /* assumed viewing distance (mm) */
51
52			#define BORWIDTH 5 /* border width */
53
54			#define ourscreen DefaultScreen(ourdisplay)
55			#define ourroot RootWindow(ourdisplay,ourscreen)
56			#define ourmask (StructureNotifyMask\|ExposureMask\|KeyPressMask\|\
57			ButtonPressMask\|ButtonReleaseMask)
58
59			#define levptr(etype) ((etype *)&currentevent)
60
61			struct driver odev; /* global device driver structure */
62
63			static XEvent currentevent; /* current event */
64
65			static int mapped = 0; /* window is mapped? */
66			static unsigned long ourblack=0, ourwhite=~0;
67
68			static Display ourdisplay = NULL; / our display */
69			static XVisualInfo ourvinf; / our visual information */
70			static Window gwind = 0; /* our graphics window */
71			static GLXContext gctx; /* our GLX context */
72
73			static double pwidth, pheight; /* pixel dimensions (mm) */
74
75	gregl	3.4	static double curzmax = 1e4; /* current depth upper limit */
76			static double nxtzmax = 0.; /* maximum (finite) depth so far */
77	gregl	3.1
78	gregl	3.4	static struct {
79			double rad; /* cone radius */
80			int nverts; /* number of vertices */
81			FVECT va; / allocated vertex array */
82			} cone[MAXCONE]; /* precomputed cones for drawing */
83
84	gregl	3.1	static int inpresflags; /* input result flags */
85
86			static int headlocked = 0; /* lock vertical motion */
87
88			static int resizewindow(), getevent(), getkey(), moveview(),
89	gregl	3.4	initcones(), freecones(),
90			getmove(), fixwindow(), mytmflags();
91	gregl	3.1
92
93			dev_open(id) /* initialize X11 driver */
94			char *id;
95			{
96			extern char *getenv();
97	gregl	3.15	static RGBPRIMS myprims = STDPRIMS;
98	gregl	3.1	static int atlBest[] = {GLX_RGBA, GLX_RED_SIZE,8,
99			GLX_GREEN_SIZE,8, GLX_BLUE_SIZE,8,
100	gregl	3.4	GLX_DEPTH_SIZE,15, None};
101	gregl	3.15	char *ev;
102	gregl	3.1	double gamval = GAMMA;
103	gregl	3.15	RGBPRIMP dpri = stdprims;
104	gregl	3.1	XSetWindowAttributes ourwinattr;
105			XWMHints ourxwmhints;
106			XSizeHints oursizhints;
107	gregl	3.4	/* set quadtree globals */
108			qtMinNodesiz = 3;
109	gregl	3.9	qtDepthEps = 0.07;
110	gregl	3.1	/* open display server */
111			ourdisplay = XOpenDisplay(NULL);
112			if (ourdisplay == NULL)
113			error(USER, "cannot open X-windows; DISPLAY variable set?\n");
114			/* find a usable visual */
115			ourvinf = glXChooseVisual(ourdisplay, ourscreen, atlBest);
116			if (ourvinf == NULL)
117			error(USER, "no suitable visuals available");
118			/* get a context */
119			gctx = glXCreateContext(ourdisplay, ourvinf, NULL, GL_TRUE);
120			/* set gamma and tone mapping */
121	gregl	3.15	if ((ev = XGetDefault(ourdisplay, "radiance", "gamma")) != NULL
122			\|\| (ev = getenv("DISPLAY_GAMMA")) != NULL)
123			gamval = atof(ev);
124			if ((ev = getenv("DISPLAY_PRIMARIES")) != NULL &&
125			sscanf(ev, "%f %f %f %f %f %f %f %f",
126			&myprims[RED][CIEX],&myprims[RED][CIEY],
127			&myprims[GRN][CIEX],&myprims[GRN][CIEY],
128			&myprims[BLU][CIEX],&myprims[BLU][CIEY],
129			&myprims[WHT][CIEX],&myprims[WHT][CIEY]) >= 6)
130			dpri = myprims;
131			if (tmInit(mytmflags(), dpri, gamval) == NULL)
132	gregl	3.1	error(SYSTEM, "not enough memory in dev_open");
133			/* open window */
134			ourwinattr.background_pixel = ourblack;
135			ourwinattr.border_pixel = ourblack;
136			ourwinattr.event_mask = ourmask;
137			/* this is stupid */
138			ourwinattr.colormap = XCreateColormap(ourdisplay, ourroot,
139			ourvinf->visual, AllocNone);
140			gwind = XCreateWindow(ourdisplay, ourroot, 0, 0,
141			DisplayWidth(ourdisplay,ourscreen)-2*BORWIDTH,
142			DisplayHeight(ourdisplay,ourscreen)-2*BORWIDTH,
143			BORWIDTH, ourvinf->depth, InputOutput, ourvinf->visual,
144			CWBackPixel\|CWBorderPixel\|CWColormap\|CWEventMask, &ourwinattr);
145			if (gwind == 0)
146			error(SYSTEM, "cannot create window\n");
147			XStoreName(ourdisplay, gwind, id);
148			/* set window manager hints */
149			ourxwmhints.flags = InputHint\|IconPixmapHint;
150			ourxwmhints.input = True;
151			ourxwmhints.icon_pixmap = XCreateBitmapFromData(ourdisplay,
152			gwind, x11icon_bits, x11icon_width, x11icon_height);
153			XSetWMHints(ourdisplay, gwind, &ourxwmhints);
154			oursizhints.min_width = MINWIDTH;
155			oursizhints.min_height = MINHEIGHT;
156			oursizhints.flags = PMinSize;
157			XSetNormalHints(ourdisplay, gwind, &oursizhints);
158	gregl	3.2	/* set GLX context */
159			glXMakeCurrent(ourdisplay, gwind, gctx);
160			glEnable(GL_DEPTH_TEST);
161			glDepthFunc(GL_LEQUAL);
162			glShadeModel(GL_FLAT);
163			glDisable(GL_DITHER);
164	gregl	3.4	glDisable(GL_CULL_FACE);
165			glMatrixMode(GL_PROJECTION);
166			glOrtho(0., 1., 0., 1., -.01, 1.01);
167			glTranslated(0., 0., -1.01);
168	gregl	3.1	/* figure out sensible view */
169			pwidth = (double)DisplayWidthMM(ourdisplay, ourscreen) /
170			DisplayWidth(ourdisplay, ourscreen);
171			pheight = (double)DisplayHeightMM(ourdisplay, ourscreen) /
172			DisplayHeight(ourdisplay, ourscreen);
173			copystruct(&odev.v, &stdview);
174			odev.v.type = VT_PER;
175	gregl	3.2	/* map the window */
176			XMapWindow(ourdisplay, gwind);
177			dev_input(); /* sets size and view angles */
178	gregl	3.4	/* allocate our leaf pile */
179	gregl	3.9	if (!qtAllocLeaves(DisplayWidth(ourdisplay,ourscreen) *
180	gregl	3.11	DisplayHeight(ourdisplay,ourscreen) * 3 /
181			(qtMinNodesizqtMinNodesiz2)))
182	gregl	3.2	error(SYSTEM, "insufficient memory for value storage");
183	gregl	3.1	odev.name = id;
184			odev.ifd = ConnectionNumber(ourdisplay);
185	gregl	3.4	/* initialize cone array */
186			initcones();
187	gregl	3.1	}
188
189
190			dev_close() /* close our display and free resources */
191			{
192			glXMakeCurrent(ourdisplay, None, NULL);
193			glXDestroyContext(ourdisplay, gctx);
194			XDestroyWindow(ourdisplay, gwind);
195			gwind = 0;
196			XCloseDisplay(ourdisplay);
197			ourdisplay = NULL;
198	gregl	3.4	qtFreeLeaves();
199	gregl	3.1	tmDone(NULL);
200	gregl	3.4	freecones();
201	gregl	3.1	odev.v.type = 0;
202			odev.hres = odev.vres = 0;
203			odev.ifd = -1;
204			}
205
206
207	gregl	3.14	dev_clear() /* clear our quadtree */
208			{
209			qtCompost(100);
210			glClear(GL_DEPTH_BUFFER_BIT);
211			rayqleft = 0; /* hold off update */
212			}
213
214
215	gregl	3.1	int
216			dev_view(nv) /* assign new driver view */
217			register VIEW *nv;
218			{
219	gregl	3.4	if (nv->type == VT_PAR \|\| /* check view legality */
220			nv->horiz > 160. \|\| nv->vert > 160.) {
221	gregl	3.1	error(COMMAND, "illegal view type/angle");
222	gregl	3.4	nv->type = odev.v.type;
223	gregl	3.1	nv->horiz = odev.v.horiz;
224			nv->vert = odev.v.vert;
225			return(0);
226			}
227	gregl	3.4	if (nv->vfore > FTINY) {
228			error(COMMAND, "cannot handle fore clipping");
229			nv->vfore = 0.;
230			return(0);
231			}
232	gregl	3.1	if (nv != &odev.v) {
233			if (!FEQ(nv->horiz,odev.v.horiz) \|\| /* resize window? */
234			!FEQ(nv->vert,odev.v.vert)) {
235			int dw = DisplayWidth(ourdisplay,ourscreen);
236			int dh = DisplayHeight(ourdisplay,ourscreen);
237
238			dw -= 25; /* for window frame */
239			dh -= 50;
240			odev.hres = 2.VIEWDIST/pwidth
241			tan(PI/180./2.*nv->horiz);
242			odev.vres = 2.VIEWDIST/pheight
243			tan(PI/180./2.*nv->vert);
244			if (odev.hres > dw) {
245			odev.vres = dw * odev.vres / odev.hres;
246			odev.hres = dw;
247			}
248			if (odev.vres > dh) {
249			odev.hres = dh * odev.hres / odev.vres;
250			odev.vres = dh;
251			}
252			XResizeWindow(ourdisplay, gwind, odev.hres, odev.vres);
253	gregl	3.2	dev_input(); /* get resize event */
254	gregl	3.1	}
255			copystruct(&odev.v, nv);
256			}
257	gregl	3.4	if (nxtzmax > FTINY) {
258			curzmax = nxtzmax;
259			nxtzmax = 0.;
260			}
261			glClear(GL_DEPTH_BUFFER_BIT);
262			qtReplant();
263	gregl	3.1	return(1);
264	gwlarson	3.18	}
265
266
267			dev_auxcom(cmd, args) /* process an auxiliary command */
268			char cmd, args;
269			{
270			sprintf(errmsg, "%s: unknown command", cmd);
271			error(COMMAND, errmsg);
272	gregl	3.1	}
273
274
275	gwlarson	3.17	VIEW *
276			dev_auxview(n, hvres) /* return nth auxiliary view */
277			int n;
278			int hvres[2];
279			{
280			if (n)
281			return(NULL);
282			hvres[0] = odev.hres; hvres[1] = odev.vres;
283			return(&odev.v);
284			}
285
286
287	gregl	3.1	int
288			dev_input() /* get X11 input */
289			{
290			inpresflags = 0;
291
292			do
293			getevent();
294
295			while (XQLength(ourdisplay) > 0);
296
297			return(inpresflags);
298			}
299
300
301	gregl	3.4	int
302			dev_flush() /* flush output */
303	gregl	3.1	{
304	gregl	3.4	qtUpdate();
305			glFlush();
306	gregl	3.10	rayqleft = RAYQLEN;
307	gregl	3.4	return(XPending(ourdisplay));
308	gregl	3.1	}
309
310
311	gregl	3.4	dev_cone(rgb, ip, rad) /* render a cone in view coordinates */
312			BYTE rgb[3];
313			FVECT ip;
314			double rad;
315	gregl	3.1	{
316	gregl	3.4	register int ci, j;
317			double apexh, basez;
318	gregl	3.12	/* is window mapped? */
319			if (!mapped)
320			return;
321	gregl	3.4	/* compute apex height (0. to 1.) */
322			if (ip[2] > 1e6)
323			apexh = 1. - 1./DEPTHFACT;
324			else {
325			if (ip[2] > nxtzmax)
326			nxtzmax = ip[2];
327			if (ip[2] >= curzmax)
328			apexh = 1. - 1./DEPTHFACT;
329			else
330			apexh = 1. - ip[2]/(curzmax*DEPTHFACT);
331	gregl	3.1	}
332	gregl	3.5	rad = 1.25; / find conservative cone match */
333	gregl	3.4	for (ci = 0; ci < MAXCONE-1; ci++)
334			if (cone[ci].rad >= rad)
335			break;
336			/* draw it */
337			glColor3ub(rgb[0], rgb[1], rgb[2]);
338			glBegin(GL_TRIANGLE_FAN);
339			glVertex3d(ip[0], ip[1], apexh); /* start with apex */
340			basez = apexhcone[ci].va[0][2]; / base z's all the same */
341			for (j = 0; j < cone[ci].nverts; j++) /* draw each face */
342			glVertex3d(ip[0]+cone[ci].va[j][0], ip[1]+cone[ci].va[j][1],
343			basez);
344			/* connect last to first */
345			glVertex3d(ip[0]+cone[ci].va[0][0], ip[1]+cone[ci].va[0][1], basez);
346			glEnd(); /* all done */
347	gregl	3.1	}
348
349
350			static int
351			mytmflags() /* figure out tone mapping flags */
352			{
353			extern char *progname;
354			register char cp, tail;
355			/* find basic name */
356			for (cp = tail = progname; *cp; cp++)
357			if (*cp == '/')
358			tail = cp+1;
359			for (cp = tail; cp && cp != '.'; cp++)
360			;
361			if (cp-tail == 3 && !strncmp(tail, "glx", 3))
362	gregl	3.10	return(TM_F_CAMERA\|TM_F_NOSTDERR);
363	gregl	3.1	if (cp-tail == 4 && !strncmp(tail, "glxh", 4))
364	gregl	3.10	return(TM_F_HUMAN\|TM_F_NOSTDERR);
365	gregl	3.1	error(USER, "illegal driver name");
366			}
367
368
369			static
370	gregl	3.4	initcones() /* initialize cone vertices */
371	gregl	3.1	{
372			register int i, j;
373	gregl	3.4	double minrad, d;
374	gregl	3.1
375	gregl	3.4	if (cone[0].nverts)
376			freecones();
377			minrad = 2.*qtMinNodesiz/(double)(DisplayWidth(ourdisplay,ourscreen) +
378			DisplayHeight(ourdisplay,ourscreen));
379			for (i = 0; i < MAXCONE; i++) {
380			d = (double)i/(MAXCONE-1); d = d; / x^2 distribution */
381			cone[i].rad = minrad + (1.-minrad)*d;
382	gregl	3.16	cone[i].nverts = MINVERT + 0.5 + (MAXVERT-MINVERT)*d;
383	gregl	3.4	cone[i].va = (FVECT )malloc(cone[i].nvertssizeof(FVECT));
384			if (cone[i].va == NULL)
385			error(SYSTEM, "out of memory in initcones");
386			for (j = cone[i].nverts; j--; ) {
387			d = 2.PI (j+.5) / (cone[i].nverts);
388			cone[i].va[j][0] = cos(d) * cone[i].rad;
389			cone[i].va[j][1] = sin(d) * cone[i].rad;
390			cone[i].va[j][2] = 1. - cone[i].rad;
391	gregl	3.2	}
392			}
393			}
394
395
396			static
397	gregl	3.4	freecones() /* free cone vertices */
398	gregl	3.2	{
399	gregl	3.4	register int i;
400	gregl	3.2
401	gregl	3.4	for (i = MAXCONE; i--; )
402			if (cone[i].nverts) {
403			free((char *)cone[i].va);
404			cone[i].va = NULL;
405			cone[i].nverts = 0;
406	gregl	3.2	}
407			}
408
409
410			static
411	gregl	3.1	getevent() /* get next event */
412			{
413			XNextEvent(ourdisplay, levptr(XEvent));
414			switch (levptr(XEvent)->type) {
415			case ConfigureNotify:
416			resizewindow(levptr(XConfigureEvent));
417			break;
418			case UnmapNotify:
419			mapped = 0;
420			break;
421			case MapNotify:
422			mapped = 1;
423			break;
424			case Expose:
425			fixwindow(levptr(XExposeEvent));
426			break;
427			case KeyPress:
428			getkey(levptr(XKeyPressedEvent));
429			break;
430			case ButtonPress:
431			getmove(levptr(XButtonPressedEvent));
432			break;
433			}
434			}
435
436
437			static
438			draw3dline(wp) /* draw 3d line in world coordinates */
439			register FVECT wp[2];
440			{
441			glVertex3d(wp[0][0], wp[0][1], wp[0][2]);
442			glVertex3d(wp[1][0], wp[1][1], wp[1][2]);
443			}
444
445
446			static
447			draw_grids() /* draw holodeck section grids */
448			{
449	gregl	3.2	static BYTE gridrgba[4] = {0x0, 0xff, 0xff, 0x00};
450	gregl	3.4	double xmin, xmax, ymin, ymax, zmin, zmax;
451			double d, cx, sx, crad;
452			FVECT vx, vy;
453			register int i, j;
454			/* can we even do it? */
455			if (!mapped \|\| odev.v.type != VT_PER)
456	gregl	3.1	return;
457	gregl	3.4	/* compute view frustum */
458			if (normalize(odev.v.vdir) == 0.0)
459			return;
460			zmin = 0.01;
461			zmax = 10000.;
462			if (odev.v.vfore > FTINY)
463			zmin = odev.v.vfore;
464			if (odev.v.vaft > FTINY)
465			zmax = odev.v.vaft;
466			xmax = zmin * tan(PI/180./2. * odev.v.horiz);
467			xmin = -xmax;
468			d = odev.v.hoff * (xmax - xmin);
469			xmin += d; xmax += d;
470			ymax = zmin * tan(PI/180./2. * odev.v.vert);
471			ymin = -ymax;
472			d = odev.v.voff * (ymax - ymin);
473			ymin += d; ymax += d;
474			/* set view matrix */
475			glMatrixMode(GL_PROJECTION);
476			glPushMatrix();
477			glLoadIdentity();
478			glFrustum(xmin, xmax, ymin, ymax, zmin, zmax);
479			gluLookAt(odev.v.vp[0], odev.v.vp[1], odev.v.vp[2],
480			odev.v.vp[0] + odev.v.vdir[0],
481			odev.v.vp[1] + odev.v.vdir[1],
482			odev.v.vp[2] + odev.v.vdir[2],
483			odev.v.vup[0], odev.v.vup[1], odev.v.vup[2]);
484			glDisable(GL_DEPTH_TEST); /* write no depth values */
485	gregl	3.1	glColor4ub(gridrgba[0], gridrgba[1], gridrgba[2], gridrgba[3]);
486	gregl	3.4	glBegin(GL_LINES); /* draw each grid line */
487	gregl	3.1	gridlines(draw3dline);
488			glEnd();
489	gregl	3.4	glEnable(GL_DEPTH_TEST); /* restore rendering params */
490			glPopMatrix();
491	gregl	3.1	}
492
493
494			static
495			moveview(dx, dy, mov, orb) /* move our view */
496			int dx, dy, mov, orb;
497			{
498			VIEW nv;
499			FVECT odir, v1;
500			double d;
501			register int li;
502			/* start with old view */
503			copystruct(&nv, &odev.v);
504			/* change view direction */
505			if (mov \| orb) {
506	gregl	3.4	if ((li = qtFindLeaf(dx, dy)) < 0)
507	gregl	3.1	return(0); /* not on window */
508	gregl	3.4	VSUM(odir, qtL.wp[li], nv.vp, -1.);
509	gregl	3.1	} else {
510			if (viewray(nv.vp, nv.vdir, &odev.v,
511			(dx+.5)/odev.hres, (dy+.5)/odev.vres) < -FTINY)
512			return(0); /* outside view */
513			}
514			if (orb && mov) { /* orbit left/right */
515			spinvector(odir, odir, nv.vup, d=MOVDEGPI/180.mov);
516	gregl	3.4	VSUM(nv.vp, qtL.wp[li], odir, -1.);
517	gregl	3.1	spinvector(nv.vdir, nv.vdir, nv.vup, d);
518			} else if (orb) { /* orbit up/down */
519			fcross(v1, odir, nv.vup);
520			if (normalize(v1) == 0.)
521			return(0);
522			spinvector(odir, odir, v1, d=MOVDEGPI/180.orb);
523	gregl	3.4	VSUM(nv.vp, qtL.wp[li], odir, -1.);
524	gregl	3.1	spinvector(nv.vdir, nv.vdir, v1, d);
525			} else if (mov) { /* move forward/backward */
526			d = MOVPCT/100. * mov;
527			VSUM(nv.vp, nv.vp, odir, d);
528			}
529			if (!mov ^ !orb && headlocked) { /* restore head height */
530			VSUM(v1, odev.v.vp, nv.vp, -1.);
531			d = DOT(v1, odev.v.vup);
532			VSUM(nv.vp, nv.vp, odev.v.vup, d);
533			}
534			if (setview(&nv) != NULL)
535			return(0); /* illegal view */
536			dev_view(&nv);
537			inpresflags \|= DFL(DC_SETVIEW);
538			return(1);
539			}
540
541
542			static
543			getmove(ebut) /* get view change */
544			XButtonPressedEvent *ebut;
545			{
546			int movdir = MOVDIR(ebut->button);
547			int movorb = MOVORB(ebut->state);
548	gregl	3.4	int oldnodesiz = qtMinNodesiz;
549	gregl	3.1	Window rootw, childw;
550			int rootx, rooty, wx, wy;
551			unsigned int statemask;
552
553	gregl	3.4	qtMinNodesiz = 24; /* accelerate update rate */
554	gregl	3.1	XNoOp(ourdisplay);
555
556			while (!XCheckMaskEvent(ourdisplay,
557			ButtonReleaseMask, levptr(XEvent))) {
558
559			if (!XQueryPointer(ourdisplay, gwind, &rootw, &childw,
560			&rootx, &rooty, &wx, &wy, &statemask))
561			break; /* on another screen */
562
563			if (!moveview(wx, odev.vres-1-wy, movdir, movorb)) {
564			sleep(1);
565			continue;
566			}
567	gregl	3.4	glClear(GL_COLOR_BUFFER_BIT);
568			qtUpdate();
569	gregl	3.1	draw_grids();
570	gregl	3.4	glFlush();
571	gregl	3.1	}
572			if (!(inpresflags & DFL(DC_SETVIEW))) { /* do final motion */
573			movdir = MOVDIR(levptr(XButtonReleasedEvent)->button);
574			wx = levptr(XButtonReleasedEvent)->x;
575			wy = levptr(XButtonReleasedEvent)->y;
576			moveview(wx, odev.vres-1-wy, movdir, movorb);
577			}
578			dev_flush();
579	gregl	3.4
580			qtMinNodesiz = oldnodesiz; /* restore quadtree resolution */
581	gregl	3.1	}
582
583
584			static
585			getkey(ekey) /* get input key */
586			register XKeyPressedEvent *ekey;
587			{
588			int n;
589			char buf[8];
590
591			n = XLookupString(ekey, buf, sizeof(buf), NULL, NULL);
592			if (n != 1)
593			return;
594			switch (buf[0]) {
595			case 'h': /* turn on height motion lock */
596			headlocked = 1;
597			return;
598			case 'H': /* turn off height motion lock */
599			headlocked = 0;
600			return;
601			case 'l': /* retrieve last view */
602			inpresflags \|= DFL(DC_LASTVIEW);
603			return;
604			case 'p': /* pause computation */
605			inpresflags \|= DFL(DC_PAUSE);
606			return;
607			case 'v': /* spit out view */
608			inpresflags \|= DFL(DC_GETVIEW);
609			return;
610			case '\n':
611			case '\r': /* resume computation */
612			inpresflags \|= DFL(DC_RESUME);
613			return;
614			case CTRL('R'): /* redraw screen */
615	gregl	3.8	if (nxtzmax > FTINY) {
616			curzmax = nxtzmax;
617			nxtzmax = 0.;
618			}
619	gregl	3.2	glClear(GL_DEPTH_BUFFER_BIT);
620	gregl	3.4	qtRedraw(0, 0, odev.hres, odev.vres);
621	gregl	3.1	return;
622			case CTRL('L'): /* refresh from server */
623			if (inpresflags & DFL(DC_REDRAW))
624			return;
625	gregl	3.8	if (nxtzmax > FTINY) {
626			curzmax = nxtzmax;
627			nxtzmax = 0.;
628			}
629	gregl	3.1	glClear(GL_COLOR_BUFFER_BIT \| GL_DEPTH_BUFFER_BIT);
630			draw_grids();
631			glFlush();
632	gregl	3.4	qtCompost(100); /* get rid of old values */
633	gregl	3.1	inpresflags \|= DFL(DC_REDRAW); /* resend values from server */
634	gregl	3.13	rayqleft = 0; /* hold off update */
635	gregl	3.1	return;
636			case 'K': /* kill rtrace process(es) */
637			inpresflags \|= DFL(DC_KILL);
638			break;
639			case 'R': /* restart rtrace */
640			inpresflags \|= DFL(DC_RESTART);
641			break;
642			case 'C': /* clobber holodeck */
643			inpresflags \|= DFL(DC_CLOBBER);
644			break;
645			case 'q': /* quit the program */
646			inpresflags \|= DFL(DC_QUIT);
647			return;
648			default:
649			XBell(ourdisplay, 0);
650			return;
651			}
652			}
653
654
655			static
656			fixwindow(eexp) /* repair damage to window */
657			register XExposeEvent *eexp;
658			{
659	gregl	3.4	int xmin, xmax, ymin, ymax;
660
661	gregl	3.2	if (odev.hres == 0 \|\| odev.vres == 0) /* first exposure */
662			resizewindow((XConfigureEvent *)eexp);
663	gregl	3.4	xmin = eexp->x; xmax = eexp->x + eexp->width;
664			ymin = odev.vres - eexp->y - eexp->height; ymax = odev.vres - eexp->y;
665			/* clear portion of depth */
666			glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
667			glDepthFunc(GL_ALWAYS);
668			glBegin(GL_POLYGON);
669			glVertex3d((double)xmin/odev.hres, (double)ymin/odev.vres, 0.);
670			glVertex3d((double)xmax/odev.hres, (double)ymin/odev.vres, 0.);
671			glVertex3d((double)xmax/odev.hres, (double)ymax/odev.vres, 0.);
672			glVertex3d((double)xmin/odev.hres, (double)ymax/odev.vres, 0.);
673			glEnd();
674			glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
675			glDepthFunc(GL_LEQUAL);
676			qtRedraw(xmin, ymin, xmax, ymax);
677	gregl	3.1	}
678
679
680			static
681			resizewindow(ersz) /* resize window */
682			register XConfigureEvent *ersz;
683			{
684	gregl	3.6	glViewport(0, 0, ersz->width, ersz->height);
685
686	gregl	3.1	if (ersz->width == odev.hres && ersz->height == odev.vres)
687			return;
688
689			odev.hres = ersz->width;
690			odev.vres = ersz->height;
691
692			odev.v.horiz = 2.180./PI atan(0.5/VIEWDISTpwidthodev.hres);
693			odev.v.vert = 2.180./PI atan(0.5/VIEWDISTpheightodev.vres);
694
695			inpresflags \|= DFL(DC_SETVIEW);
696			}