/*
GenSurf plugin for GtkRadiant
Copyright (C) 2001 David Hyde, Loki software and qeradiant.com

This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include "gensurf.h"

#undef ISOMETRIC

extern double backface;
extern double dh, dv;
extern double xmin,xmax,ymin,ymax,zmin,zmax;

double    SF, SFG;         // Graphics scale factors
double    XLo, XHi, YLo, YHi, ZLo, ZHi;
double    yaw,roll;
double    elevation,azimuth;
int       cxChar = 10, cyChar = 16;
int       X0, Y0;
int       X0G, Y0G;

static Rect rcCoord;   // where X= Y= is drawn
static Rect rcGrid;    // rectangle within rcLower that forms the border of the grid, plus
                       //   a 3 pixel slop.
static Rect rcLower;   // lower half of window, where plan view is drawn
static Rect rcUpper;   // upper half or entire window, where isometric projection is drawn

void vertex_selected ();
void texfont_init ();
void texfont_write (const char *text, int l, int t);

#define PEN_GRID { \
  g_GLTable.m_pfn_qglLineWidth (1); \
  g_GLTable.m_pfn_qglColor3f (0, 1, 0); \
  g_GLTable.m_pfn_qglDisable (GL_LINE_STIPPLE); }

#define PEN_RED { \
  g_GLTable.m_pfn_qglLineWidth (2); \
  g_GLTable.m_pfn_qglColor3f (1, 0, 0); \
  g_GLTable.m_pfn_qglDisable (GL_LINE_STIPPLE); }

#define PEN_DASH { \
  g_GLTable.m_pfn_qglLineWidth (1); \
  g_GLTable.m_pfn_qglColor3f (0, 1, 0); \
  g_GLTable.m_pfn_qglLineStipple (1, 0xF0F0); \
  g_GLTable.m_pfn_qglEnable (GL_LINE_STIPPLE); }

#define DRAW_QUAD(rc,r,g,b) { \
  g_GLTable.m_pfn_qglBegin (GL_QUADS); \
  g_GLTable.m_pfn_qglColor3f (0,1,0); \
  g_GLTable.m_pfn_qglVertex2i (rc.left-1, rc.bottom); \
  g_GLTable.m_pfn_qglVertex2i (rc.right, rc.bottom); \
  g_GLTable.m_pfn_qglVertex2i (rc.right, rc.top+1); \
  g_GLTable.m_pfn_qglVertex2i (rc.left-1, rc.top+1); \
  g_GLTable.m_pfn_qglColor3f (r,g,b); \
  g_GLTable.m_pfn_qglVertex2i (rc.left, rc.bottom+1); \
  g_GLTable.m_pfn_qglVertex2i (rc.right-1, rc.bottom+1); \
  g_GLTable.m_pfn_qglVertex2i (rc.right-1, rc.top); \
  g_GLTable.m_pfn_qglVertex2i (rc.left, rc.top); \
  g_GLTable.m_pfn_qglEnd (); }


#ifndef ISOMETRIC
double    D=65536.;
double    ct[3],st[3];
double    Hhi, Hlo, Vhi, Vlo;
#endif

#define SUBDIVS 6


void ShowPreview ()
{
  if (Preview)
  {
    if (g_pWndPreview == NULL)
      CreateViewWindow ();
    gtk_widget_show (g_pWndPreview);

    UpdatePreview (true);
  }
  else
    gtk_widget_hide (g_pWndPreview);
}

static void draw_preview ()
{
  int width = g_pPreviewWidget->allocation.width, height = g_pPreviewWidget->allocation.height;

  g_GLTable.m_pfn_qglClearColor (0, 0, 0, 1);
  g_GLTable.m_pfn_qglViewport (0, 0, width, height);
  g_GLTable.m_pfn_qglMatrixMode (GL_PROJECTION);
  g_GLTable.m_pfn_qglLoadIdentity ();
  g_GLTable.m_pfn_qglOrtho (0, width, 0, height, -1, 1);
  g_GLTable.m_pfn_qglClear (GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
	
	// ^Fishman - Antializing for the preview window.
	if (Antialiasing)
	{
		g_GLTable.m_pfn_qglEnable(GL_BLEND);
		g_GLTable.m_pfn_qglBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
		g_GLTable.m_pfn_qglEnable(GL_LINE_SMOOTH);
	}
	else
	{
		g_GLTable.m_pfn_qglDisable(GL_BLEND);
		g_GLTable.m_pfn_qglDisable(GL_LINE_SMOOTH);
	}

  texfont_init ();

  if (!ValidSurface ())
    return;

  rcUpper.left = 0;
  rcUpper.right = width;
  rcUpper.bottom = 0;
  rcUpper.top = height;
  rcLower.left = 0;
  rcLower.right = width;
  rcLower.bottom = 0;
  rcLower.top = height;

  if (VertexMode)
  {
    rcUpper.bottom = rcUpper.top/2;
    DrawPreview (rcUpper);
    g_GLTable.m_pfn_qglBegin (GL_LINES);
    g_GLTable.m_pfn_qglVertex2i (rcUpper.left, rcUpper.bottom);
    g_GLTable.m_pfn_qglVertex2i (rcUpper.right, rcUpper.bottom);
    g_GLTable.m_pfn_qglEnd ();
    rcLower.top = rcUpper.bottom-1;
    DrawGrid (rcLower);
    rcCoord.left = rcLower.left;
    rcCoord.right = rcLower.right;
    rcCoord.bottom = rcLower.bottom;
    rcCoord.top = rcLower.top;
    rcCoord.top = rcCoord.bottom+cyChar;
    rcCoord.right = rcCoord.left + 15*cxChar;
    rcGrid.left   = X0G - 3;
    rcGrid.bottom = Y0G - 3;
    rcGrid.right  = X0G + (int)(SFG*(Hur-Hll)) + 3;
    rcGrid.top    = Y0G + (int)(SFG*(Vur-Vll)) + 3;
  }
  else
    DrawPreview (rcUpper);
}

static gint expose (GtkWidget *widget, GdkEventExpose *event, gpointer data)
{
  if (event->count > 0)
    return TRUE;

  if (!g_UIGtkTable.m_pfn_glwidget_make_current (g_pPreviewWidget))
  {
    g_FuncTable.m_pfnSysPrintf ("GtkGenSurf: glMakeCurrent failed\n");
    return TRUE;
  }

  draw_preview ();

  g_UIGtkTable.m_pfn_glwidget_swap_buffers (g_pPreviewWidget);
  g_GLTable.m_pfn_QE_CheckOpenGLForErrors ();

  return TRUE;
}

static void button_press (GtkWidget *widget, GdkEventButton *event, gpointer data)
{
  Point pt = { (long)event->x, widget->allocation.height - (long)event->y };
  bool        Selected;
  double      x,y;
  int         i, j, k, ks;
  int         i0, i1, j0, j1;

  if ((!VertexMode) || (event->button != 1))
    return;

  if (!PtInRect (&rcGrid,pt))
  {
    gdk_beep ();
    return;
  }

  x = Hll + (pt.x-X0G)/SFG;
  y = Vur - (pt.y-Y0G)/SFG;
  i = (int)(floor( (x-Hll)/dh - 0.5) + 1);
  j = (int)(floor( (y-Vll)/dv - 0.5) + 1);
  if (i < 0 || i > NH || j < 0 || j > NV)
  {
    gdk_beep ();
    return;
  }

  if(!CanEdit(i,j))
  {
    gdk_beep ();
    return;
  }

  // Control key pressed - add this point, or remove it if already selected
  if ((event->state & GDK_CONTROL_MASK) != 0)
  {
    Selected = FALSE;
    if (NumVerticesSelected)
    {
      for (k=0; k<NumVerticesSelected && !Selected; k++)
      {
        if(Vertex[k].i == i && Vertex[k].j == j)
        {
          Selected = TRUE;
          ks = k;
        }
      }
    }

    // Already selected - unselect it.
    if (Selected)
    {
      if (ks < NumVerticesSelected)
      {
        for (k=ks;k<NumVerticesSelected-1;k++)
        {
          Vertex[k].i = Vertex[k+1].i;
          Vertex[k].j = Vertex[k+1].j;
        }
        NumVerticesSelected--;
      }
    }
    else
    {
      Vertex[NumVerticesSelected].i = i;
      Vertex[NumVerticesSelected].j = j;
      NumVerticesSelected++;
    }
  }
  else if ((event->state & GDK_SHIFT_MASK) != 0)
  {
    if (NumVerticesSelected)
    {
      NumVerticesSelected = 1;
      i0 = min(Vertex[0].i, i);
      i1 = max(Vertex[0].i, i);
      j0 = min(Vertex[0].j, j);
      j1 = max(Vertex[0].j, j);
      for(i=i0; i<=i1; i++)
      {
        for(j=j0; j<=j1; j++)
        {
          if(i==0  && j==0 ) continue;
          if(i==NH && j==0 ) continue;
          if(i==0  && j==NV) continue;
          if(i==NH && j==NV) continue;
          if(i != Vertex[0].i || j != Vertex[0].j)
          {
            Vertex[NumVerticesSelected].i = i;
            Vertex[NumVerticesSelected].j = j;
            NumVerticesSelected++;
          }
        }
      }
    }
    else
    {
      Vertex[0].i = i;
      Vertex[0].j = j;
      NumVerticesSelected = 1;
    }
  }
  else
  {
    Vertex[0].i = i;
    Vertex[0].j = j;
    NumVerticesSelected = 1;
  }

  vertex_selected ();
}

static void motion (GtkWidget *widget, GdkEventMotion *event, gpointer data)
{
  Point pt = { (long)event->x, widget->allocation.height - (long)event->y };

  if (!VertexMode)
    return;

  if (!g_UIGtkTable.m_pfn_glwidget_make_current (g_pPreviewWidget))
  {
    g_FuncTable.m_pfnSysPrintf ("GtkGenSurf: glMakeCurrent failed\n");
    return;
  }

  g_GLTable.m_pfn_qglEnable (GL_SCISSOR_TEST);
  g_GLTable.m_pfn_qglScissor (rcCoord.left, rcCoord.bottom, rcCoord.right-rcCoord.left,
                              rcCoord.top-rcCoord.bottom);
  g_GLTable.m_pfn_qglClear (GL_COLOR_BUFFER_BIT);

  if (PtInRect(&rcGrid,pt))
  {
    GdkCursor *cursor = gdk_cursor_new (GDK_CROSS);
    gdk_window_set_cursor (g_pWndPreview->window, cursor);
    gdk_cursor_unref (cursor);

    char Text[32];
    int x, y;

    x = (int)(Hll + (pt.x-X0G)/SFG);
    y = (int)(Vur - (pt.y-Y0G)/SFG);
    switch(Plane)
    {
    case PLANE_XZ0:
    case PLANE_XZ1:
      sprintf(Text," x=%d, z=%d   ",(int)(floor(x-0.5)+1.) ,(int)(floor(y-0.5)+1.) );
      break;
    case PLANE_YZ0:
    case PLANE_YZ1:
      sprintf(Text," y=%d, z=%d   ",(int)(floor(x-0.5)+1.) ,(int)(floor(y-0.5)+1.) );
      break;
    default:
      sprintf(Text," x=%d, y=%d   ",(int)(floor(x-0.5)+1.) ,(int)(floor(y-0.5)+1.) );
    }

    texfont_write (Text, rcCoord.left, rcCoord.top);
  }
  else
  {
    gdk_window_set_cursor (g_pWndPreview->window, NULL);
  }

  g_UIGtkTable.m_pfn_glwidget_swap_buffers (g_pPreviewWidget);
  g_GLTable.m_pfn_QE_CheckOpenGLForErrors ();
  g_GLTable.m_pfn_qglDisable (GL_SCISSOR_TEST);
}

static gint preview_close (GtkWidget *widget, gpointer data)
{
  gtk_toggle_button_set_active (GTK_TOGGLE_BUTTON (g_object_get_data (G_OBJECT (g_pWnd), "main_preview")), FALSE);
  return TRUE;
}

static void preview_focusout (GtkSpinButton *spin, GdkEventFocus *event, double *data)
{
  *data = DegreesToRadians ((double)(gtk_spin_button_get_value_as_int (spin) % 360));
  UpdatePreview (false);
}

static gint doublevariable_spinfocusout(GtkWidget* widget, GdkEventFocus* event, gpointer data)
{
  preview_focusout(GTK_SPIN_BUTTON(widget), event, reinterpret_cast<double*>(data));
  return FALSE;
}

static void preview_spin (GtkAdjustment *adj, double *data)
{
  *data = DegreesToRadians (adj->value);
  UpdatePreview (false);
}

void CreateViewWindow ()
{
  GtkWidget *dlg, *vbox, *hbox, *label, *spin, *frame;
  GtkObject *adj;

#ifndef ISOMETRIC
  elevation = PI/6.;
  azimuth   = PI/6.;
#endif

  g_pWndPreview = dlg = gtk_window_new (GTK_WINDOW_TOPLEVEL);
  gtk_window_set_title (GTK_WINDOW (dlg), "GtkGenSurf Preview");
  gtk_signal_connect (GTK_OBJECT (dlg), "delete_event", GTK_SIGNAL_FUNC (preview_close), NULL);
  gtk_signal_connect (GTK_OBJECT (dlg), "destroy", GTK_SIGNAL_FUNC (gtk_widget_destroy), NULL);
  gtk_window_set_transient_for (GTK_WINDOW (dlg), GTK_WINDOW (g_pWnd));
  gtk_window_set_default_size (GTK_WINDOW (dlg), 300, 400);

  vbox = gtk_vbox_new (FALSE, 5);
  gtk_widget_show (vbox);
  gtk_container_add (GTK_CONTAINER (dlg), vbox);

#ifndef ISOMETRIC
  hbox = gtk_hbox_new (TRUE, 5);
  gtk_widget_show (hbox);
  gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, TRUE, 0);
  gtk_container_set_border_width (GTK_CONTAINER (hbox), 3);

  label = gtk_label_new ("Elevation");
  gtk_widget_show (label);
  gtk_misc_set_alignment (GTK_MISC (label), 1, 0.5);
  gtk_box_pack_start (GTK_BOX (hbox), label, FALSE, TRUE, 0);

  adj = gtk_adjustment_new (30, -90, 90, 1, 10, 0);
  gtk_signal_connect (adj, "value_changed", GTK_SIGNAL_FUNC (preview_spin), &elevation);
  spin = gtk_spin_button_new (GTK_ADJUSTMENT (adj), 1, 0);
  gtk_widget_show (spin);
  gtk_box_pack_start (GTK_BOX (hbox), spin, FALSE, TRUE, 0);
  g_signal_connect (G_OBJECT (spin), "focus_out_event", G_CALLBACK (doublevariable_spinfocusout), &elevation);

  adj = gtk_adjustment_new (30, 0, 359, 1, 10, 0);
  gtk_signal_connect (adj, "value_changed", GTK_SIGNAL_FUNC (preview_spin), &azimuth);
  spin = gtk_spin_button_new (GTK_ADJUSTMENT (adj), 1, 0);
  gtk_widget_show (spin);
  gtk_spin_button_set_wrap (GTK_SPIN_BUTTON (spin), TRUE);
  gtk_box_pack_end (GTK_BOX (hbox), spin, FALSE, TRUE, 0);

  label = gtk_label_new ("Azimuth");
  gtk_widget_show (label);
  gtk_misc_set_alignment (GTK_MISC (label), 1, 0.5);
  gtk_box_pack_end (GTK_BOX (hbox), label, FALSE, TRUE, 0);
  g_signal_connect (G_OBJECT (spin), "focus_out_event", G_CALLBACK (doublevariable_spinfocusout), &azimuth);
#endif

  frame = gtk_frame_new (NULL);
  gtk_widget_show (frame);
  gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
  gtk_box_pack_start (GTK_BOX (vbox), frame, TRUE, TRUE, 0);

  g_pPreviewWidget = g_UIGtkTable.m_pfn_glwidget_new (FALSE, NULL);

  gtk_widget_set_events (g_pPreviewWidget, GDK_EXPOSURE_MASK|GDK_BUTTON_PRESS_MASK|GDK_POINTER_MOTION_MASK);
  gtk_signal_connect (GTK_OBJECT (g_pPreviewWidget), "expose_event", GTK_SIGNAL_FUNC (expose), NULL);
  gtk_signal_connect (GTK_OBJECT (g_pPreviewWidget), "motion_notify_event", GTK_SIGNAL_FUNC (motion), NULL);
  gtk_signal_connect (GTK_OBJECT (g_pPreviewWidget), "button_press_event",
                      GTK_SIGNAL_FUNC (button_press), NULL);

  gtk_widget_show (g_pPreviewWidget);
  gtk_container_add (GTK_CONTAINER (frame), g_pPreviewWidget);

  if (Preview)
    gtk_widget_show (g_pWndPreview);

  UpdatePreview (true);
}

//=============================================================
/* DrawPreview */
void DrawPreview (Rect rc)
{
#define COSXA 0.8660254037844
#define SINXA 0.5
#define COSYA 0.8660254037844
#define SINYA 0.5

  double     L;
  double     x,y;
  int        i, j;
  Point      pt[8];
  XYZ        v[8];
  char axis[3][2] = {"X","Y","Z"};

#ifndef ISOMETRIC
  evaluate();
#endif

  XLo = xmin;
  XHi = xmax;
  YLo = ymin;
  YHi = ymax;
  ZLo = zmin;
  ZHi = zmax;
  switch (Plane)
  {
  case PLANE_XY1:
    ZHi = backface;
    break;
  case PLANE_XZ0:
    YLo = backface;
    break;
  case PLANE_XZ1:
    YHi = backface;
    break;
  case PLANE_YZ0:
    XLo = backface;
    break;
  case PLANE_YZ1:
    XHi = backface;
    break;
  default:
    ZLo = backface;
  }



  GetScaleFactor(rc);
	//PEN_GRID
	g_GLTable.m_pfn_qglLineWidth (1);
	g_GLTable.m_pfn_qglColor3f (0, 1, 0);
	g_GLTable.m_pfn_qglDisable (GL_LINE_STIPPLE);

    if (Decimate > 0 && (Game != QUAKE3 || UsePatches==0) )
    {
      XYZ  *vv;

      vv   = (XYZ *) malloc(gNumNodes * sizeof(XYZ));
      for(i=0; i<gNumNodes; i++)
      {
        for(j=0; j<3; j++)
          vv[i].p[j] = (double)(gNode[i].p[j]);
        project(&vv[i]);
      }

      for(i=0; i<gNumTris; i++)
      {
        for(j=0; j<3; j++)
          Scale(rc,vv[gTri[i].v[j]],&pt[j]);

        g_GLTable.m_pfn_qglBegin (GL_LINE_STRIP);
        g_GLTable.m_pfn_qglVertex2i (pt[0].x, pt[0].y);
        g_GLTable.m_pfn_qglVertex2i (pt[1].x, pt[1].y);
        g_GLTable.m_pfn_qglVertex2i (pt[2].x, pt[2].y);
        g_GLTable.m_pfn_qglVertex2i (pt[0].x, pt[0].y);
        g_GLTable.m_pfn_qglEnd ();
      }
      free(vv);
    }
    else if (Game==QUAKE3 && UsePatches!=0)
    {
      int		axis, ii, jj, k;
      float	u, v;
      XYZ		uv[3][3];
      XYZ		Ctrl[3],out;

      switch (Plane)
      {
      case PLANE_XY0:
      case PLANE_XY1:
        k = 2;
        break;
      case PLANE_XZ0:
      case PLANE_XZ1:
        k = 1;
        break;
      default:
        k = 0;
      }
      for(i=0; i<NH; i+=2)
      {
        for(j=0; j<NV; j+=2)
        {
          VectorCopy(xyz[i  ][j  ].p,uv[0][0].p);
          VectorCopy(xyz[i+1][j  ].p,uv[1][0].p);
          VectorCopy(xyz[i+2][j  ].p,uv[2][0].p);
          VectorCopy(xyz[i  ][j+1].p,uv[0][1].p);
          VectorCopy(xyz[i+1][j+1].p,uv[1][1].p);
          VectorCopy(xyz[i+2][j+1].p,uv[2][1].p);
          VectorCopy(xyz[i  ][j+2].p,uv[0][2].p);
          VectorCopy(xyz[i+1][j+2].p,uv[1][2].p);
          VectorCopy(xyz[i+2][j+2].p,uv[2][2].p);
          uv[1][0].p[k] = (4*xyz[i+1][j  ].p[k] - xyz[i  ][j  ].p[k] - xyz[i+2][j  ].p[k])/2;
          uv[0][1].p[k] = (4*xyz[i  ][j+1].p[k] - xyz[i  ][j  ].p[k] - xyz[i  ][j+2].p[k])/2;
          uv[2][1].p[k] = (4*xyz[i+2][j+1].p[k] - xyz[i+2][j  ].p[k] - xyz[i+2][j+2].p[k])/2;
          uv[1][2].p[k] = (4*xyz[i+1][j+2].p[k] - xyz[i  ][j+2].p[k] - xyz[i+2][j+2].p[k])/2;
          uv[1][1].p[k] = (16*xyz[i+1][j+1].p[k] -
                           xyz[i  ][j  ].p[k] - 2*xyz[i+1][j  ].p[k] -  xyz[i+2][j  ].p[k] -
                           2*xyz[i  ][j+1].p[k]                        -2*xyz[i+2][j+1].p[k] -
                           xyz[i  ][j+2].p[k] - 2*xyz[i+1][j+2].p[k] -  xyz[i+2][j+2].p[k]   )/4;

          for(ii=0; ii<=SUBDIVS; ii++)
          {
            if(ii==0 || ii==SUBDIVS/2 || ii==SUBDIVS)
						{
							g_GLTable.m_pfn_qglLineWidth (1);
							g_GLTable.m_pfn_qglColor3f (0, 1, 0);
							g_GLTable.m_pfn_qglDisable (GL_LINE_STIPPLE);
							// PEN_GRID
						}
            else
						{
							g_GLTable.m_pfn_qglLineWidth (1);
							g_GLTable.m_pfn_qglColor3f (0, 1, 0);
							g_GLTable.m_pfn_qglLineStipple (1, 0xF0F0);
							g_GLTable.m_pfn_qglEnable (GL_LINE_STIPPLE);
              // PEN_DASH
						}

            u = (float)(ii)/(float)(SUBDIVS);
            for(jj=0; jj<3; jj++)
            {
              for(axis=0; axis<3; axis++)
              {
                float	a, b, c;
                float	qA, qB, qC;
                a = (float)uv[0][jj].p[axis];
                b = (float)uv[1][jj].p[axis];
                c = (float)uv[2][jj].p[axis];
                qA = a - 2 * b + c;
                qB = 2 * b - 2 * a;
                qC = a;
                Ctrl[jj].p[axis] = qA * u * u + qB * u + qC;
              }
            }
            VectorCopy(Ctrl[0].p,out.p);
            project(&out);
            Scale(rc,out,&pt[0]);
            g_GLTable.m_pfn_qglBegin (GL_LINE_STRIP);
            g_GLTable.m_pfn_qglVertex2i (pt[0].x, pt[0].y);
            for(jj=1; jj<=SUBDIVS; jj++)
            {
              v = (float)(jj)/(float)(SUBDIVS);
              for (axis = 0 ; axis < 3 ; axis++) 
              {
                float	a, b, c;
                float	qA, qB, qC;
                a = (float)Ctrl[0].p[axis];
                b = (float)Ctrl[1].p[axis];
                c = (float)Ctrl[2].p[axis];
                qA = a - 2 * b + c;
                qB = 2 * b - 2 * a;
                qC = a;
                out.p[axis] = qA * v * v + qB * v + qC;
              }
              project(&out);
              Scale(rc,out,&pt[0]);
              g_GLTable.m_pfn_qglVertex2i (pt[0].x, pt[0].y);
            }
            g_GLTable.m_pfn_qglEnd ();
          }
          for(jj=0; jj<=SUBDIVS; jj++)
          {
            if(jj==0 || jj==SUBDIVS/2 || jj==SUBDIVS)
						{
							g_GLTable.m_pfn_qglLineWidth (1);
							g_GLTable.m_pfn_qglColor3f (0, 1, 0);
							g_GLTable.m_pfn_qglDisable (GL_LINE_STIPPLE);
              // PEN_GRID
						}
            else
						{
							g_GLTable.m_pfn_qglLineWidth (1);
							g_GLTable.m_pfn_qglColor3f (0, 1, 0);
							g_GLTable.m_pfn_qglLineStipple (1, 0xF0F0);
							g_GLTable.m_pfn_qglEnable (GL_LINE_STIPPLE);
							// PEN_DASH
						}

            v = (float)(jj)/(float)(SUBDIVS);
            for(ii=0; ii<3; ii++)
            {
              for(axis=0; axis<3; axis++)
              {
                float	a, b, c;
                float	qA, qB, qC;
                a = (float)uv[ii][0].p[axis];
                b = (float)uv[ii][1].p[axis];
                c = (float)uv[ii][2].p[axis];
                qA = a - 2 * b + c;
                qB = 2 * b - 2 * a;
                qC = a;
                Ctrl[ii].p[axis] = qA * v * v + qB * v + qC;
              }
            }
            VectorCopy(Ctrl[0].p,out.p);
            project(&out);
            Scale(rc,out,&pt[0]);
            g_GLTable.m_pfn_qglBegin (GL_LINE_STRIP);
            g_GLTable.m_pfn_qglVertex2i (pt[0].x, pt[0].y);
            for(ii=1; ii<=SUBDIVS; ii++)
            {
              u = (float)(ii)/(float)(SUBDIVS);
              for (axis = 0 ; axis < 3 ; axis++) 
              {
                float	a, b, c;
                float	qA, qB, qC;
                a = (float)Ctrl[0].p[axis];
                b = (float)Ctrl[1].p[axis];
                c = (float)Ctrl[2].p[axis];
                qA = a - 2 * b + c;
                qB = 2 * b - 2 * a;
                qC = a;
                out.p[axis] = qA * u * u + qB * u + qC;
              }
              project(&out);
              Scale(rc,out,&pt[0]);
              g_GLTable.m_pfn_qglVertex2i (pt[0].x, pt[0].y);
            }
            g_GLTable.m_pfn_qglEnd ();
          }
        }
      }
    }
    else
    {
      for(i=0; i<=NH; i++)
      {
        Scale(rc,xyz[i][0],&pt[0]);
        g_GLTable.m_pfn_qglBegin (GL_LINE_STRIP);
        g_GLTable.m_pfn_qglVertex2i (pt[0].x, pt[0].y);
        for(j=1; j<=NV; j++)
        {
          Scale(rc,xyz[i][j],&pt[0]);
          g_GLTable.m_pfn_qglVertex2i (pt[0].x, pt[0].y);
        }
        g_GLTable.m_pfn_qglEnd ();
      }
      for(j=0; j<=NV; j++)
      {
        Scale(rc,xyz[0][j],&pt[0]);
        g_GLTable.m_pfn_qglBegin (GL_LINE_STRIP);
        g_GLTable.m_pfn_qglVertex2i (pt[0].x, pt[0].y);
        for(i=1; i<=NH; i++)
        {
          Scale(rc,xyz[i][j],&pt[0]);
          g_GLTable.m_pfn_qglVertex2i (pt[0].x, pt[0].y);
        }
        g_GLTable.m_pfn_qglEnd ();
      }
    }

  if(Game!=QUAKE3 || UsePatches==0)
  {
    // Draw lines from corners to base, and lines around base
    for(i=0; i<=NH; i+=NH)
    {
      for(j=0; j<=NV; j+=NV)
      {
        VectorCopy(xyz[i][j].p, v[0].p);
        switch(Plane)
        {
        case PLANE_XZ0:
        case PLANE_XZ1:
          v[0].p[1] = backface;
          break;
        case PLANE_YZ0:
        case PLANE_YZ1:
          v[0].p[0] = backface;
          break;
        default:
          v[0].p[2] = backface;
        }
        Scale(rc,xyz[i][j],&pt[0]);
#ifndef ISOMETRIC
        project(&v[0]);
#endif
        Scale(rc,v[0],&pt[1]);
        g_GLTable.m_pfn_qglBegin (GL_LINE_STRIP);
        g_GLTable.m_pfn_qglVertex2i (pt[0].x, pt[0].y);
        g_GLTable.m_pfn_qglVertex2i (pt[1].x, pt[1].y);
        g_GLTable.m_pfn_qglEnd ();
      }
    }
    VectorCopy(xyz[ 0][ 0].p, v[0].p);
    VectorCopy(xyz[NH][ 0].p, v[1].p);
    VectorCopy(xyz[NH][NV].p, v[2].p);
    VectorCopy(xyz[ 0][NV].p, v[3].p);
    switch(Plane)
    {
    case PLANE_XZ0:
    case PLANE_XZ1:
      v[0].p[1] = backface;;
      v[1].p[1] = v[0].p[1];
      v[2].p[1] = v[0].p[1];
      v[3].p[1] = v[0].p[1];
      break;
    case PLANE_YZ0:
    case PLANE_YZ1:
      v[0].p[0] = backface;
      v[1].p[0] = v[0].p[0];
      v[2].p[0] = v[0].p[0];
      v[3].p[0] = v[0].p[0];
      break;
    default:
      v[0].p[2] = backface;
      v[1].p[2] = v[0].p[2];
      v[2].p[2] = v[0].p[2];
      v[3].p[2] = v[0].p[2];
    }
#ifndef ISOMETRIC
    project(&v[3]);
#endif
    Scale(rc,v[3],&pt[0]);
    g_GLTable.m_pfn_qglBegin (GL_LINE_STRIP);
    g_GLTable.m_pfn_qglVertex2i (pt[0].x, pt[0].y);
    for(i=0; i<3; i++)
    {
#ifndef ISOMETRIC
      project(&v[i]);
#endif
      Scale(rc,v[i],&pt[1]);
      g_GLTable.m_pfn_qglVertex2i (pt[1].x, pt[1].y);
    }
    g_GLTable.m_pfn_qglVertex2i (pt[0].x, pt[0].y);
    g_GLTable.m_pfn_qglEnd ();
  }

  g_GLTable.m_pfn_qglLineWidth (1);
  g_GLTable.m_pfn_qglColor3f (0, 1, 0);
  g_GLTable.m_pfn_qglDisable (GL_LINE_STIPPLE);

#ifdef ISOMETRIC
  // Draw small depiction of coordinate axes
  pt[0].x = rc.right  - cxChar   - cxChar/2 -  cyChar;
  pt[0].y = rc.bottom - cyChar/2 - cxChar/2;
  pt[1].x = pt[0].x + (int)(cyChar*COSXA);
  pt[1].y = pt[0].y - (int)(cyChar*SINXA);
  MoveToEx(hdc,pt[0].x,pt[0].y,NULL);
  LineTo(hdc,pt[1].x,pt[1].y);
  SetTextAlign(hdc,TA_LEFT | TA_TOP);
  TextOut(hdc,pt[1].x,pt[1].y-cyChar/2,"X",1);
  pt[1].x = pt[0].x - (int)(cyChar*COSYA);
  pt[1].y = pt[0].y - (int)(cyChar*SINYA);
  MoveToEx(hdc,pt[0].x,pt[0].y,NULL);
  LineTo(hdc,pt[1].x,pt[1].y);
  SetTextAlign(hdc,TA_RIGHT | TA_TOP);
  TextOut(hdc,pt[1].x,pt[1].y-cyChar/2,"Y",1);
  pt[1].x = pt[0].x;
  pt[1].y = pt[0].y - cyChar;
  MoveToEx(hdc,pt[0].x,pt[0].y,NULL);
  LineTo(hdc,pt[1].x,pt[1].y);
  SetTextAlign(hdc,TA_CENTER | TA_BOTTOM);
  TextOut(hdc,pt[1].x,pt[1].y,"Z",1);
#else
  L = 2*(double)cyChar/SF;
  v[0].p[0] = 0.;
  v[0].p[1] = 0.;
  v[0].p[2] = 0.;
  v[1].p[0] = L;
  v[1].p[1] = 0.;
  v[1].p[2] = 0.;
  v[2].p[0] = 0.;
  v[2].p[1] = L;
  v[2].p[2] = 0.;
  v[3].p[0] = 0.;
  v[3].p[1] = 0.;
  v[3].p[2] = L;
  for(i=0; i<=3; i++)
  {
    project(&v[i]);
    Scale(rc,v[i],&pt[i]);
  }
  for(i=1; i<=3; i++)
  {
    pt[i].x += -pt[0].x + rc.right  - 2*cyChar;
    pt[i].y += -pt[0].y + rc.bottom + 2*cyChar;
  }
  pt[0].x = rc.right  - 2*cyChar;
  pt[0].y = rc.bottom + 2*cyChar;

  for(i=1; i<=3; i++)
  {
    g_GLTable.m_pfn_qglBegin (GL_LINES);
    g_GLTable.m_pfn_qglVertex2i (pt[0].x, pt[0].y);
    g_GLTable.m_pfn_qglVertex2i (pt[i].x, pt[i].y);
    g_GLTable.m_pfn_qglEnd ();
    texfont_write (axis[i-1], pt[i].x-cxChar/2,pt[i].y+cyChar/2);
  }
#endif

  // Draw player model's bounding box in red to give a sense of scale
  // PEN_RED
	g_GLTable.m_pfn_qglLineWidth (2);
	g_GLTable.m_pfn_qglColor3f (1, 0, 0);
	g_GLTable.m_pfn_qglDisable (GL_LINE_STIPPLE);

  switch(Plane)
  {
  case PLANE_XY1:
    v[0].p[0] = xyz[NH/2][NV/2].p[0] + PlayerBox[Game].x[0];
    v[0].p[1] = xyz[NH/2][NV/2].p[1] + PlayerBox[Game].y[0];
    v[0].p[2] = zmin - PlayerBox[Game].z[0] - 32;
    break;
  case PLANE_XZ0:
    v[0].p[0] = (xmax+xmin)/2 + PlayerBox[Game].x[0];
    v[0].p[1] = ymax+64;
    v[0].p[2] = zmin;
    break;
  case PLANE_XZ1:
    v[0].p[0] = (xmax+xmin)/2 + PlayerBox[Game].x[0];
    v[0].p[1] = ymin-64;
    v[0].p[2] = zmin;
    break;
  case PLANE_YZ0:
    v[0].p[0] = xmax+64;
    v[0].p[1] = (ymax+ymin)/2 + PlayerBox[Game].y[0];
    v[0].p[2] = zmin;
    break;
  case PLANE_YZ1:
    v[0].p[0] = xmin-64;
    v[0].p[1] = (ymax+ymin)/2 + PlayerBox[Game].y[0];
    v[0].p[2] = zmin;
    break;
  default:
    // Put player on a node. For patches, put on an even numbered node.
    if(Game==QUAKE3 && UsePatches!=0)
    {
      if(NH > 2)
        x = Hll + dh * (int)(NH/2 + 1);
      else
        x = Hll + dh * (int)(NH/2);
      if(NV > 2)
        y = Vll + dv * (int)(NV/2 + 1);
      else
        y = Vll + dv * (int)(NV/2);
    }
    else
    {
      if(NH > 1)
        x = Hll + dh * (int)(NH/2);
      else
        x = Hll + dh/2;
      if(NV > 1)
        y = Vll + dv * (int)(NV/2);
      else
        y = Vll + dv/2;
    }
//		x = (Hll+Hur)/2.;
//		y = (Vll+Vur)/2.;
    v[0].p[0] = x + PlayerBox[Game].x[0];
    v[0].p[1] = y + PlayerBox[Game].y[0];
    v[0].p[2] = PlayerStartZ(x,y) + PlayerBox[Game].z[0] + 8; // add 8 cuz I'm a pessimist
  }
  v[1].p[0] = v[0].p[0] + PlayerBox[Game].x[1] - PlayerBox[Game].x[0];
  v[1].p[1] = v[0].p[1];
  v[1].p[2] = v[0].p[2];
  v[2].p[0] = v[1].p[0];
  v[2].p[1] = v[1].p[1] + PlayerBox[Game].y[1] - PlayerBox[Game].y[0];
  v[2].p[2] = v[0].p[2];
  v[3].p[0] = v[0].p[0];
  v[3].p[1] = v[2].p[1];
  v[3].p[2] = v[0].p[2];
  VectorCopy(v[0].p,v[4].p);
  VectorCopy(v[1].p,v[5].p);
  VectorCopy(v[2].p,v[6].p);
  VectorCopy(v[3].p,v[7].p);
  v[4].p[2] += PlayerBox[Game].z[1] - PlayerBox[Game].z[0];
  v[5].p[2] += PlayerBox[Game].z[1] - PlayerBox[Game].z[0];
  v[6].p[2] += PlayerBox[Game].z[1] - PlayerBox[Game].z[0];
  v[7].p[2] += PlayerBox[Game].z[1] - PlayerBox[Game].z[0];
  for(i=0; i<=7; i++)
  {
#ifndef ISOMETRIC
    project(&v[i]);
#endif
    Scale(rc,v[i],&pt[i]);
  }
  g_GLTable.m_pfn_qglBegin (GL_LINE_STRIP);
  g_GLTable.m_pfn_qglVertex2i (pt[3].x, pt[3].y);
  for(i=0; i<=3; i++)
    g_GLTable.m_pfn_qglVertex2i (pt[i].x, pt[i].y);
  g_GLTable.m_pfn_qglEnd ();
  g_GLTable.m_pfn_qglBegin (GL_LINE_STRIP);
  g_GLTable.m_pfn_qglVertex2i (pt[7].x, pt[7].y);
  for(i=4; i<=7; i++)
    g_GLTable.m_pfn_qglVertex2i (pt[i].x, pt[i].y);
  g_GLTable.m_pfn_qglEnd ();
  g_GLTable.m_pfn_qglBegin (GL_LINES);
  for(i=0; i<=3; i++)
  {
    g_GLTable.m_pfn_qglVertex2i (pt[i].x,pt[i].y);
    g_GLTable.m_pfn_qglVertex2i (pt[i+4].x,pt[i+4].y);
  }
  g_GLTable.m_pfn_qglEnd ();

  g_GLTable.m_pfn_qglLineWidth (1);
  g_GLTable.m_pfn_qglColor3f (0, 1, 0);
  g_GLTable.m_pfn_qglDisable (GL_LINE_STIPPLE);
}
//=============================================================
void DrawGrid(Rect rc)
{
  int        i, j, k;
  double     h,w,x,y;
  Point      pt[2];
  Rect       rcBox;

  w = (double)(rc.right-rc.left+1) - cxChar;
  h = (double)(rc.top-rc.bottom+1) - cxChar - cyChar;

  SFG = w/(Hur-Hll);
  SFG = min(SFG, h/(Vur-Vll));

  // Center drawing
  X0G = (int)(rc.left + rc.right - (int)(SFG*(Hur-Hll)))/2;
  Y0G = (int)(rc.top + rc.bottom + cyChar - (int)(SFG*(Vur-Vll)))/2;

  g_GLTable.m_pfn_qglLineWidth (2);
  g_GLTable.m_pfn_qglColor3f (0, 1, 0);
  g_GLTable.m_pfn_qglDisable (GL_LINE_STIPPLE);

  pt[0].y = Y0G;
  pt[1].y = Y0G + (int)(SFG*(Vur-Vll));
  g_GLTable.m_pfn_qglBegin (GL_LINES);
  for(i=0; i<=NH; i++)
  {
    x = Hll + i * dh;
    pt[0].x = X0G + (int)(SFG*(x-Hll));
    g_GLTable.m_pfn_qglVertex2i(pt[0].x, pt[0].y);
    g_GLTable.m_pfn_qglVertex2i(pt[0].x, pt[1].y);
  }
  g_GLTable.m_pfn_qglEnd ();
  pt[0].x = X0G;
  pt[1].x = X0G + (int)(SFG*(Hur-Hll));
  g_GLTable.m_pfn_qglBegin (GL_LINES);
  for(i=0; i<=NV; i++)
  {
    y = Vll + i * dv;
    pt[0].y = Y0G + (int)(SFG*(Vur-y));
    g_GLTable.m_pfn_qglVertex2i (pt[0].x,pt[0].y);
    g_GLTable.m_pfn_qglVertex2i (pt[1].x,pt[0].y);
  }
  g_GLTable.m_pfn_qglEnd ();

  g_GLTable.m_pfn_qglLineWidth (1);

  // Draw axes
  pt[0].x = rc.right  - cyChar - cxChar - cyChar/2;
  pt[0].y = rc.bottom + cyChar/2;
  pt[1].x = pt[0].x + cyChar;
  pt[1].y = pt[0].y;
  g_GLTable.m_pfn_qglBegin (GL_LINES);
  g_GLTable.m_pfn_qglVertex2i (pt[0].x,pt[0].y);
  g_GLTable.m_pfn_qglVertex2i (pt[1].x,pt[1].y);
  g_GLTable.m_pfn_qglEnd ();
  switch(Plane)
  {
  case PLANE_YZ0:
  case PLANE_YZ1:
    texfont_write ("Y", pt[1].x, pt[1].y+cyChar/2);
    break;
  default:
    texfont_write ("X", pt[1].x, pt[1].y+cyChar/2);
  }
  pt[1].x = pt[0].x;
  pt[1].y = pt[0].y + cyChar;
  g_GLTable.m_pfn_qglBegin (GL_LINES);
  g_GLTable.m_pfn_qglVertex2i (pt[0].x,pt[0].y);
  g_GLTable.m_pfn_qglVertex2i (pt[1].x,pt[1].y);
  g_GLTable.m_pfn_qglEnd ();
  switch(Plane)
  {
  case PLANE_XY0:
  case PLANE_XY1:
    texfont_write ("Y", pt[1].x-cyChar/2, pt[1].y+cyChar);
    break;
  default:
    texfont_write ("Z", pt[1].x-cyChar/2, pt[1].y+cyChar);
  }

  // Denote fixed points with a 5x5 red rectangle
  for(i=0; i<=NH; i++)
  {
    for(j=0; j<=NV; j++)
    {
      if(xyz[i][j].fixed)
      {
        x = Hll + i*dh;
        y = Vll + j*dv;
        rcBox.left   = X0G + (int)(SFG*(x-Hll)) - 2;
        rcBox.top    = Y0G + (int)(SFG*(Vur-y)) + 2;
        rcBox.right  = rcBox.left + 5;
        rcBox.bottom = rcBox.top  - 5;

        DRAW_QUAD (rcBox, 1,0,0);
      }
    }
  }

  // Denote currently selected point with a 5x5 green rectangle
  if (NumVerticesSelected)
  {
    for(k=0; k<NumVerticesSelected; k++)
    {
      x = Hll + Vertex[k].i*dh;
      y = Vll + Vertex[k].j*dv;
      rcBox.left   = X0G + (int)(SFG*(x-Hll)) - 2;
      rcBox.top    = Y0G + (int)(SFG*(Vur-y)) + 2;
      rcBox.right  = rcBox.left + 5;
      rcBox.bottom = rcBox.top  - 5;

      DRAW_QUAD (rcBox, 0,1,0);
    }
  }

  // Unmovable vertices
  for(i=0; i<=NH; i++)
  {
    for(j=0; j<=NV; j++)
    {
      if(!CanEdit(i,j))
      {
        x = Hll + i*dh;
        y = Vll + j*dv;
        rcBox.left   = X0G + (int)(SFG*(x-Hll)) - 2;
        rcBox.top    = Y0G + (int)(SFG*(Vur-y)) + 2;
        rcBox.right  = rcBox.left + 5;
        rcBox.bottom = rcBox.top  - 5;

        DRAW_QUAD (rcBox, 1,1,0);
      }
    }
  }

  // Legend
  rcBox.left   = rc.left + cxChar/2 - 2;
  rcBox.top    = rc.top  - cyChar/2 - 2;
  rcBox.right  = rcBox.left + 5;
  rcBox.bottom = rcBox.top  - 5;
  DRAW_QUAD (rcBox, 1,0,0);
  texfont_write ("Fixed points", rcBox.right+cxChar,rcBox.top-4+cyChar/2);

  rcBox.top    -= cyChar;
  rcBox.bottom -= cyChar;
  DRAW_QUAD (rcBox, 1,1,0);
  texfont_write ("Not movable", rcBox.right+cxChar, rcBox.top-4+cyChar/2);

  rcBox.top    -= cyChar;
  rcBox.bottom -= cyChar;
  DRAW_QUAD (rcBox, 0,1,0);
  texfont_write ("Selected", rcBox.right+cxChar, rcBox.top-4+cyChar/2);
}

//=============================================================
void GetScaleFactor(Rect rc)
{
#ifdef ISOMETRIC
	double      h, w;

	w = (double)(rc.right-rc.left+1) - cxChar;
	h = (double)(rc.top-rc.bottom+1) - cxChar;

	SF = w/( (XHi-XLo)*COSXA + (YHi-YLo)*COSYA );
	SF = min(SF, h/( (XHi-XLo)*SINXA + (YHi-YLo)*SINYA + ZHi-ZLo ) );
	// Center drawing
	X0 = (int)(rc.left + rc.right - (int)(SF*( (XHi-XLo)*COSXA + (YHi-YLo)*COSYA )) )/2;
	Y0 = (int)(rc.top + rc.bottom - (int)(SF*( (XHi-XLo)*SINXA + (YHi-YLo)*SINYA + ZHi-ZLo) ))/2;

#else
	double      h, w;

	w = (double)(rc.right-rc.left+1) - cxChar;
	h = (double)(rc.top-rc.bottom+1) - cxChar;

	SF = w/(Hhi-Hlo);
	SF = min(SF, h/(Vhi-Vlo) );
	X0 = (int)(rc.left + rc.right - (int)(SF*(Hhi-Hlo)))/2;
	Y0 = (int)(rc.top + rc.bottom + (int)(SF*(Vhi-Vlo)))/2;
#endif
}

//=============================================================
void Scale(Rect rc,XYZ xyz,Point *pt)
{

#ifdef ISOMETRIC

	pt[0].x = X0 + (int)(SF*( (xyz.p[0]-XLo)*COSXA +
                              (YHi-xyz.p[1])*COSYA   ));
	pt[0].y = Y0 + (int)(SF*(  ZHi-xyz.p[2] +
	                          (YHi-xyz.p[1])*SINYA +
					          (XHi-xyz.p[0])*SINXA   ));
#else
	pt[0].x = X0 + (int)(SF*( xyz.pp[0] - Hlo ) );
	pt[0].y = Y0 - (int)(SF*( Vhi - xyz.pp[1] ) );
#endif

}

#ifndef ISOMETRIC
/* ======================================================================= */
void project(XYZ *v)
{
	// project a 3D point (x,y,z) onto view plane
	double x, y, z, xa, ya, za;

	x = v->p[0];
	y = v->p[1];
	z = v->p[2];

	// yaw
	xa = ct[0]*x - st[0]*z;
	za = st[0]*x + ct[0]*z;

	// roll
	x  = ct[1]*xa + st[1]*y;
	ya = ct[1]*y  - st[1]*xa;

	// azimuth
	z  = ct[2]*za - st[2]*ya;
	y  = ct[2]*ya + st[2]*za;

	// horizontal and vertical projections:
//	v->pp[0] = D*x/z;
//	v->pp[1] = D*y/z;
	v->pp[0] = -y;
	v->pp[1] =  x;
	v->pp[2] =  z;

	// NOTE: if perspective transformation is desired,
	// set "persp" to the range from the surface,
	// then:
	// v->projected_h = -v->projected_h * persp/(v->projected_z-persp);
	// v->projected_v = -v->projected_v * persp/(v->projected_z-persp);
}
/*=======================================================================*/
void evaluate()
{
	int i, j;
	XYZ v[4];
	
	if(elevation > PI) elevation -= 2.*PI;
	roll = elevation * sin(azimuth);
	yaw  = 1.5*PI + elevation*cos(azimuth);

	//	Find angles from midpoint to viewpoint:
	st[0] = sin(yaw);
	st[1] = sin(roll);
	st[2] = sin(azimuth);
	ct[0] = cos(yaw);
	ct[1] = cos(roll);
	ct[2] = cos(azimuth);

	for(i=0; i<=NH; i++)
	{
		for(j=0; j<=NV; j++)
		{
			project(&xyz[i][j]);
		}
	}

	Hhi = xyz[0][0].pp[0];
	Hlo = Hhi;
	Vhi = xyz[0][0].pp[1];
	Vlo = Vhi;
	for(i=0; i<=NH; i++)
	{
		for(j=0; j<=NV; j++)
		{
			Hlo = min(Hlo,xyz[i][j].pp[0]);
			Hhi = max(Hhi,xyz[i][j].pp[0]);
			Vlo = min(Vlo,xyz[i][j].pp[1]);
			Vhi = max(Vhi,xyz[i][j].pp[1]);
		}
	}

	// Include backface in min-max
	VectorCopy(xyz[ 0][ 0].p,v[0].p);
	VectorCopy(xyz[NH][ 0].p,v[1].p);
	VectorCopy(xyz[NH][NV].p,v[2].p);
	VectorCopy(xyz[ 0][NV].p,v[3].p);
	switch(Plane)
	{
	case PLANE_XZ0:
	case PLANE_XZ1:
		v[0].p[1] = backface;
		v[1].p[1] = v[0].p[1];
		v[2].p[1] = v[0].p[1];
		v[3].p[1] = v[0].p[1];
		break;
	case PLANE_YZ0:
	case PLANE_YZ1:
		v[0].p[0] = backface;
		v[1].p[0] = v[0].p[0];
		v[2].p[0] = v[0].p[0];
		v[3].p[0] = v[0].p[0];
		break;
	default:
		v[0].p[2] = backface;
		v[1].p[2] = v[0].p[2];
		v[2].p[2] = v[0].p[2];
		v[3].p[2] = v[0].p[2];
	}
	for(i=0; i<=3; i++)
	{
		project(&v[i]);
		Hlo = min(Hlo,v[i].pp[0]);
		Hhi = max(Hhi,v[i].pp[0]);
		Vlo = min(Vlo,v[i].pp[1]);
		Vhi = max(Vhi,v[i].pp[1]);
	}

}
#endif
