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rhd_glx1.c

#ifndef lint
static const char RCSid[] = "$Id: rhd_glx1.c,v 3.6 2006/06/07 17:52:04 schorsch Exp $";
#endif
/*
 * OpenGL GLX driver for holodeck display.
 * Based on x11 driver.
 */

#include "standard.h"

#include  <GL/glx.h>
#include  <GL/glu.h>

#include "platform.h"
#include "rhd_qtree.h"
#include "rhdriver.h"
#include "rhdisp.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 */

TMstruct    *tmGlobal;        /* global tone-mapping structure */

char odev_args[64];                 /* command arguments */

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 mytmflags(void);
static void initcones(void);
static void freecones(void);
static void getevent(void);
static void draw3dline(FVECT  wp[2]);
static void draw_grids(void);
static int moveview(int dx, int     dy, int     mov, int    orb);
static void getmove(XButtonPressedEvent   *ebut);
static void getkey(XKeyPressedEvent  *ekey);
static void fixwindow(XExposeEvent  *eexp);
static void resizewindow(XConfigureEvent  *ersz);


extern void
dev_open(
      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;
      tmGlobal = tmInit(mytmflags(), dpri, gamval);
      if (tmGlobal == 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);
      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();
}


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


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


extern int
dev_view(               /* 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 */
            }
            odev.v = *nv;
      }
      if (nxtzmax > FTINY) {
            curzmax = nxtzmax;
            nxtzmax = 0.;
      }
      glClear(GL_DEPTH_BUFFER_BIT);
      qtReplant();
      return(1);
}


extern void
dev_section(            /* add octree for geometry rendering */
      char  *gfn,
      char  *pfn
)
{
      /* unimplemented */
}


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


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


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

      do
            getevent();

      while (XQLength(ourdisplay) > 0);

      return(inpresflags);
}


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


extern void
dev_cone(         /* 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(void)               /* 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 == 4 && !strncmp(tail, "glx1", 4))
            return(TM_F_CAMERA|TM_F_NOSTDERR);
      if (cp-tail == 5 && !strncmp(tail, "glx1h", 5))
            return(TM_F_HUMAN|TM_F_NOSTDERR);
      error(USER, "illegal driver name");
      return -1; /* pro forma return */
}


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

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


static void
getevent(void)                /* 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 void
draw3dline(             /* 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 void
draw_grids(void)              /* draw holodeck section grids */
{
      static BYTE gridrgba[4] = {0x0, 0xff, 0xff, 0x00};
      double      xmin, xmax, ymin, ymax, zmin, zmax;
      double      d;
                              /* 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 int
moveview(   /* move our view */
      int   dx,
      int   dy,
      int   mov,
      int   orb
)
{
      VIEW  nv;
      FVECT odir, v1;
      double      d;
      register int      li;
                        /* start with old view */
      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 void
getmove(                      /* 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 void
getkey(                       /* 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 void
fixwindow(                    /* 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 void
resizewindow(                 /* 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);
}

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