gtkradiant/contrib/prtview/portals.cpp

/*
PrtView plugin for GtkRadiant
Copyright (C) 2001 Geoffrey Dewan, 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 "stdafx.h"
#include <string.h>
#include <stdlib.h>
#ifndef __APPLE__
#include <search.h>
#endif
#include <stdio.h>

#define LINE_BUF 1000

CPortals portals;
CPortalsRender render;

int compare( const void *arg1, const void *arg2 )
{

	if(portals.portal[*((int *)arg1)].dist > portals.portal[*((int *)arg2)].dist)
		return -1;
	else if(portals.portal[*((int *)arg1)].dist < portals.portal[*((int *)arg2)].dist)
		return 1;

	return 0;
}


CBspPortal::CBspPortal()
{
	memset(this, 0, sizeof(CBspPortal));
}

CBspPortal::~CBspPortal()
{
	delete[] point;
	delete[] inner_point;
}

qboolean CBspPortal::Build(char *def)
{
	char *c = def;
	unsigned int n;
	int dummy1, dummy2;
	int res_cnt, i;

	if(portals.hint_flags)
	{
		res_cnt = sscanf(def, "%u %d %d %d", &point_count, &dummy1, &dummy2, (int *)&hint);
	}
	else
	{
		sscanf(def, "%u", &point_count);
		hint = FALSE;
	}

	if(point_count < 3 || (portals.hint_flags && res_cnt < 4))
		return FALSE;

	point = new CBspPoint[point_count];
	inner_point = new CBspPoint[point_count];

	for(n = 0; n < point_count; n++)
	{
		for(; *c != 0 && *c != '('; c++);

		if(*c == 0)
			return FALSE;

		c++;

		sscanf(c, "%f %f %f", point[n].p, point[n].p+1, point[n].p+2);

		center.p[0] += point[n].p[0];
		center.p[1] += point[n].p[1];
		center.p[2] += point[n].p[2];

		if(n == 0)
		{
			for(i = 0; i < 3; i++)
			{
				min[i] = point[n].p[i];
				max[i] = point[n].p[i];
			}
		}
		else
		{
			for(i = 0; i < 3; i++)
			{
				if(min[i] > point[n].p[i])
					min[i] = point[n].p[i];
				if(max[i] < point[n].p[i])
					max[i] = point[n].p[i];
			}
		}
	}

	center.p[0] /= (float)point_count;
	center.p[1] /= (float)point_count;
	center.p[2] /= (float)point_count;

	for(n = 0; n < point_count; n++)
	{
		inner_point[n].p[0] = (0.01f * center.p[0]) + (0.99f * point[n].p[0]);
		inner_point[n].p[1] = (0.01f * center.p[1]) + (0.99f * point[n].p[1]);
		inner_point[n].p[2] = (0.01f * center.p[2]) + (0.99f * point[n].p[2]);
	}

	fp_color_random[0] = (float)(rand() & 0xff) / 255.0f;
	fp_color_random[1] = (float)(rand() & 0xff) / 255.0f;
	fp_color_random[2] = (float)(rand() & 0xff) / 255.0f;
	fp_color_random[3] = 1.0f;

	return TRUE;
}

CPortals::CPortals()
{
	memset(this, 0, sizeof(CPortals));
}

CPortals::~CPortals()
{
	Purge();
}

void CPortals::Purge()
{
	delete[] portal;
	delete[] portal_sort;
	portal = NULL;
	portal_sort = NULL;
	portal_count = 0;

	/*
	delete[] node;
	node = NULL;
	node_count = 0;
	*/
}

void CPortals::Load()
{
	char buf[LINE_BUF+1];

	memset(buf, 0, LINE_BUF + 1);
	
	Purge();

	Sys_Printf(MSG_PREFIX "Loading portal file %s.\n", fn);

	FILE *in;

	in = fopen(fn, "rt");

	if(in == NULL)
	{
		Sys_Printf("  ERROR - could not open file.\n");

		return;
	}

	if(!fgets(buf, LINE_BUF, in))
	{
		fclose(in);

		Sys_Printf("  ERROR - File ended prematurely.\n");

		return;
	}

	if(strncmp("PRT1", buf, 4) != 0)
	{
		fclose(in);

		Sys_Printf("  ERROR - File header indicates wrong file type (should be \"PRT1\").\n");

		return;
	}

	if(!fgets(buf, LINE_BUF, in))
	{
		fclose(in);

		Sys_Printf("  ERROR - File ended prematurely.\n");

		return;
	}

	sscanf(buf, "%u", &node_count);
/*
	if(node_count > 0xFFFF)
	{
		fclose(in);

		node_count = 0;

		Sys_Printf("  ERROR - Extreme number of nodes, aborting.\n");

		return;
	}
	*/

	if(!fgets(buf, LINE_BUF, in))
	{
		fclose(in);

		node_count = 0;

		Sys_Printf("  ERROR - File ended prematurely.\n");

		return;
	}

	sscanf(buf, "%u", &portal_count);

	if(portal_count > 0xFFFF)
	{
		fclose(in);

		portal_count = 0;
		node_count = 0;

		Sys_Printf("  ERROR - Extreme number of portals, aborting.\n");

		return;
	}

	if(portal_count < 0)
	{
		fclose(in);

		portal_count = 0;
		node_count = 0;

		Sys_Printf("  ERROR - number of portals equals 0, aborting.\n");

		return;
	}

//	node = new CBspNode[node_count];
	portal = new CBspPortal[portal_count];
	portal_sort = new int[portal_count];

	unsigned int n;
	qboolean first = TRUE;
	unsigned test_vals_1, test_vals_2;

	hint_flags = FALSE;

	for(n = 0; n < portal_count; )
	{
		if(!fgets(buf, LINE_BUF, in))
		{
			fclose(in);

			Purge();

			Sys_Printf("  ERROR - Could not find information for portal number %d of %d.\n", n + 1, portal_count);

			return;
		}

		if(!portal[n].Build(buf))
		{
			if(first && sscanf(buf, "%d %d", &test_vals_1, &test_vals_2) == 1) // skip additional counts of later data, not needed
			{
				// We can count on hint flags being in the file
				hint_flags = TRUE;
				continue;
			}

			first = FALSE;

			fclose(in);

			Purge();

			Sys_Printf("  ERROR - Information for portal number %d of %d is not formatted correctly.\n", n + 1, portal_count);

			return;
		}

		n++;
	}

	fclose(in);

	Sys_Printf("  %u portals read in.\n", node_count, portal_count);
}

void CPortals::FixColors()
{
	fp_color_2d[0] = (float)GetRValue(color_2d) / 255.0f;
	fp_color_2d[1] = (float)GetGValue(color_2d) / 255.0f;
	fp_color_2d[2] = (float)GetBValue(color_2d) / 255.0f;
	fp_color_2d[3] = 1.0f;

	fp_color_3d[0] = (float)GetRValue(color_3d) / 255.0f;
	fp_color_3d[1] = (float)GetGValue(color_3d) / 255.0f;
	fp_color_3d[2] = (float)GetBValue(color_3d) / 255.0f;
	fp_color_3d[3] = 1.0f;

	fp_color_fog[0] = 0.0f;//(float)GetRValue(color_fog) / 255.0f;
	fp_color_fog[1] = 0.0f;//(float)GetGValue(color_fog) / 255.0f;
	fp_color_fog[2] = 0.0f;//(float)GetBValue(color_fog) / 255.0f;
	fp_color_fog[3] = 1.0f;
}

CPortalsRender::CPortalsRender()
{
	refCount = 1;
}

CPortalsRender::~CPortalsRender()
{
}

void CPortalsRender::Register()
{
	g_QglTable.m_pfnHookGL2DWindow( this );
	g_QglTable.m_pfnHookGL3DWindow( this );
}

void CPortalsRender::Draw2D( VIEWTYPE vt )
{
	if(!portals.show_2d || portals.portal_count < 1)
		return;

	g_QglTable.m_pfn_qglPushAttrib(GL_ALL_ATTRIB_BITS);

	if(portals.aa_2d)
	{
		g_QglTable.m_pfn_qglEnable(GL_BLEND);
		g_QglTable.m_pfn_qglEnable(GL_LINE_SMOOTH);
	}
	else
	{
		g_QglTable.m_pfn_qglDisable(GL_BLEND);
		g_QglTable.m_pfn_qglEnable(GL_LINE_SMOOTH);
	}

	switch(vt)
	{
	case XY:
		break;
	case XZ:
		g_QglTable.m_pfn_qglRotatef(270.0f, 1.0f, 0.0f, 0.0f);
		break;
	case YZ:
		g_QglTable.m_pfn_qglRotatef(270.0f, 1.0f, 0.0f, 0.0f);
		g_QglTable.m_pfn_qglRotatef(270.0f, 0.0f, 0.0f, 1.0f);
		break;
	}

	g_QglTable.m_pfn_qglLineWidth(portals.width_2d * 0.5f);

	g_QglTable.m_pfn_qglColor4fv(portals.fp_color_2d);

	unsigned int n, p;

	for(n = 0; n < portals.portal_count; n++)
	{
		g_QglTable.m_pfn_qglBegin(GL_LINE_LOOP);

		for(p = 0; p < portals.portal[n].point_count; p++)
			g_QglTable.m_pfn_qglVertex3fv(portals.portal[n].point[p].p);

		g_QglTable.m_pfn_qglEnd();
	}

	g_QglTable.m_pfn_qglPopAttrib();
}

/*
 * Transform a point (column vector) by a 4x4 matrix.  I.e.  out = m * in
 * Input:  m - the 4x4 matrix
 *         in - the 4x1 vector
 * Output:  out - the resulting 4x1 vector.
 */
static void transform_point( GLdouble out[4], const GLdouble m[16],
			     const GLdouble in[4] )
{
#define M(row,col)  m[col*4+row]
   out[0] = M(0,0) * in[0] + M(0,1) * in[1] + M(0,2) * in[2] + M(0,3) * in[3];
   out[1] = M(1,0) * in[0] + M(1,1) * in[1] + M(1,2) * in[2] + M(1,3) * in[3];
   out[2] = M(2,0) * in[0] + M(2,1) * in[1] + M(2,2) * in[2] + M(2,3) * in[3];
   out[3] = M(3,0) * in[0] + M(3,1) * in[1] + M(3,2) * in[2] + M(3,3) * in[3];
#undef M
}

#include <math.h>


/*
 * Perform a 4x4 matrix multiplication  (product = a x b).
 * Input:  a, b - matrices to multiply
 * Output:  product - product of a and b
 */
static void matmul( GLdouble *product, const GLdouble *a, const GLdouble *b )
{
   /* This matmul was contributed by Thomas Malik */
   GLdouble temp[16];
   GLint i;

#define A(row,col)  a[(col<<2)+row]
#define B(row,col)  b[(col<<2)+row]
#define T(row,col)  temp[(col<<2)+row]

   /* i-te Zeile */
   for (i = 0; i < 4; i++)
     {
	T(i, 0) = A(i, 0) * B(0, 0) + A(i, 1) * B(1, 0) + A(i, 2) * B(2, 0) + A(i, 3) * B(3, 0);
	T(i, 1) = A(i, 0) * B(0, 1) + A(i, 1) * B(1, 1) + A(i, 2) * B(2, 1) + A(i, 3) * B(3, 1);
	T(i, 2) = A(i, 0) * B(0, 2) + A(i, 1) * B(1, 2) + A(i, 2) * B(2, 2) + A(i, 3) * B(3, 2);
	T(i, 3) = A(i, 0) * B(0, 3) + A(i, 1) * B(1, 3) + A(i, 2) * B(2, 3) + A(i, 3) * B(3, 3);
     }

#undef A
#undef B
#undef T
   memcpy ( product, temp, 16*sizeof(GLdouble) );
}



/*
 * Compute inverse of 4x4 transformation matrix.
 * Code contributed by Jacques Leroy jle@star.be
 * Return GL_TRUE for success, GL_FALSE for failure (singular matrix)
 */
static GLboolean invert_matrix( const GLdouble *m, GLdouble *out )
{
/* NB. OpenGL Matrices are COLUMN major. */
#define SWAP_ROWS(a, b) { GLdouble *_tmp = a; (a)=(b); (b)=_tmp; }
#define MAT(m,r,c) (m)[(c)*4+(r)]

 GLdouble wtmp[4][8];
 GLdouble m0, m1, m2, m3, s;
 GLdouble *r0, *r1, *r2, *r3;

 r0 = wtmp[0], r1 = wtmp[1], r2 = wtmp[2], r3 = wtmp[3];

 r0[0] = MAT(m,0,0), r0[1] = MAT(m,0,1),
 r0[2] = MAT(m,0,2), r0[3] = MAT(m,0,3),
 r0[4] = 1.0, r0[5] = r0[6] = r0[7] = 0.0,

 r1[0] = MAT(m,1,0), r1[1] = MAT(m,1,1),
 r1[2] = MAT(m,1,2), r1[3] = MAT(m,1,3),
 r1[5] = 1.0, r1[4] = r1[6] = r1[7] = 0.0,

 r2[0] = MAT(m,2,0), r2[1] = MAT(m,2,1),
 r2[2] = MAT(m,2,2), r2[3] = MAT(m,2,3),
 r2[6] = 1.0, r2[4] = r2[5] = r2[7] = 0.0,

 r3[0] = MAT(m,3,0), r3[1] = MAT(m,3,1),
 r3[2] = MAT(m,3,2), r3[3] = MAT(m,3,3),
 r3[7] = 1.0, r3[4] = r3[5] = r3[6] = 0.0;

 /* choose pivot - or die */
 if (fabs(r3[0])>fabs(r2[0])) SWAP_ROWS(r3, r2);
 if (fabs(r2[0])>fabs(r1[0])) SWAP_ROWS(r2, r1);
 if (fabs(r1[0])>fabs(r0[0])) SWAP_ROWS(r1, r0);
 if (0.0 == r0[0])  return GL_FALSE;

 /* eliminate first variable     */
 m1 = r1[0]/r0[0]; m2 = r2[0]/r0[0]; m3 = r3[0]/r0[0];
 s = r0[1]; r1[1] -= m1 * s; r2[1] -= m2 * s; r3[1] -= m3 * s;
 s = r0[2]; r1[2] -= m1 * s; r2[2] -= m2 * s; r3[2] -= m3 * s;
 s = r0[3]; r1[3] -= m1 * s; r2[3] -= m2 * s; r3[3] -= m3 * s;
 s = r0[4];
 if (s != 0.0) { r1[4] -= m1 * s; r2[4] -= m2 * s; r3[4] -= m3 * s; }
 s = r0[5];
 if (s != 0.0) { r1[5] -= m1 * s; r2[5] -= m2 * s; r3[5] -= m3 * s; }
 s = r0[6];
 if (s != 0.0) { r1[6] -= m1 * s; r2[6] -= m2 * s; r3[6] -= m3 * s; }
 s = r0[7];
 if (s != 0.0) { r1[7] -= m1 * s; r2[7] -= m2 * s; r3[7] -= m3 * s; }

 /* choose pivot - or die */
 if (fabs(r3[1])>fabs(r2[1])) SWAP_ROWS(r3, r2);
 if (fabs(r2[1])>fabs(r1[1])) SWAP_ROWS(r2, r1);
 if (0.0 == r1[1])  return GL_FALSE;

 /* eliminate second variable */
 m2 = r2[1]/r1[1]; m3 = r3[1]/r1[1];
 r2[2] -= m2 * r1[2]; r3[2] -= m3 * r1[2];
 r2[3] -= m2 * r1[3]; r3[3] -= m3 * r1[3];
 s = r1[4]; if (0.0 != s) { r2[4] -= m2 * s; r3[4] -= m3 * s; }
 s = r1[5]; if (0.0 != s) { r2[5] -= m2 * s; r3[5] -= m3 * s; }
 s = r1[6]; if (0.0 != s) { r2[6] -= m2 * s; r3[6] -= m3 * s; }
 s = r1[7]; if (0.0 != s) { r2[7] -= m2 * s; r3[7] -= m3 * s; }

 /* choose pivot - or die */
 if (fabs(r3[2])>fabs(r2[2])) SWAP_ROWS(r3, r2);
 if (0.0 == r2[2])  return GL_FALSE;

 /* eliminate third variable */
 m3 = r3[2]/r2[2];
 r3[3] -= m3 * r2[3], r3[4] -= m3 * r2[4],
 r3[5] -= m3 * r2[5], r3[6] -= m3 * r2[6],
 r3[7] -= m3 * r2[7];

 /* last check */
 if (0.0 == r3[3]) return GL_FALSE;

 s = 1.0/r3[3];              /* now back substitute row 3 */
 r3[4] *= s; r3[5] *= s; r3[6] *= s; r3[7] *= s;

 m2 = r2[3];                 /* now back substitute row 2 */
 s  = 1.0/r2[2];
 r2[4] = s * (r2[4] - r3[4] * m2), r2[5] = s * (r2[5] - r3[5] * m2),
 r2[6] = s * (r2[6] - r3[6] * m2), r2[7] = s * (r2[7] - r3[7] * m2);
 m1 = r1[3];
 r1[4] -= r3[4] * m1, r1[5] -= r3[5] * m1,
 r1[6] -= r3[6] * m1, r1[7] -= r3[7] * m1;
 m0 = r0[3];
 r0[4] -= r3[4] * m0, r0[5] -= r3[5] * m0,
 r0[6] -= r3[6] * m0, r0[7] -= r3[7] * m0;

 m1 = r1[2];                 /* now back substitute row 1 */
 s  = 1.0/r1[1];
 r1[4] = s * (r1[4] - r2[4] * m1), r1[5] = s * (r1[5] - r2[5] * m1),
 r1[6] = s * (r1[6] - r2[6] * m1), r1[7] = s * (r1[7] - r2[7] * m1);
 m0 = r0[2];
 r0[4] -= r2[4] * m0, r0[5] -= r2[5] * m0,
 r0[6] -= r2[6] * m0, r0[7] -= r2[7] * m0;

 m0 = r0[1];                 /* now back substitute row 0 */
 s  = 1.0/r0[0];
 r0[4] = s * (r0[4] - r1[4] * m0), r0[5] = s * (r0[5] - r1[5] * m0),
 r0[6] = s * (r0[6] - r1[6] * m0), r0[7] = s * (r0[7] - r1[7] * m0);

 MAT(out,0,0) = r0[4]; MAT(out,0,1) = r0[5],
 MAT(out,0,2) = r0[6]; MAT(out,0,3) = r0[7],
 MAT(out,1,0) = r1[4]; MAT(out,1,1) = r1[5],
 MAT(out,1,2) = r1[6]; MAT(out,1,3) = r1[7],
 MAT(out,2,0) = r2[4]; MAT(out,2,1) = r2[5],
 MAT(out,2,2) = r2[6]; MAT(out,2,3) = r2[7],
 MAT(out,3,0) = r3[4]; MAT(out,3,1) = r3[5],
 MAT(out,3,2) = r3[6]; MAT(out,3,3) = r3[7]; 

 return GL_TRUE;

#undef MAT
#undef SWAP_ROWS
}

GLint UnProject(GLdouble winx,GLdouble winy,GLdouble winz,
		const GLdouble model[16],const GLdouble proj[16],
		const GLint viewport[4],
		GLdouble *objx,GLdouble *objy,GLdouble *objz)
{
    /* matrice de transformation */
    GLdouble m[16], A[16];
    GLdouble in[4],out[4];

    /* transformation coordonnees normalisees entre -1 et 1 */
    in[0]=(winx-viewport[0])*2/viewport[2] - 1.0;
    in[1]=(winy-viewport[1])*2/viewport[3] - 1.0;
    in[2]=2*winz - 1.0;
    in[3]=1.0;

    /* calcul transformation inverse */
    matmul(A,proj,model);
    invert_matrix(A,m);

    /* d'ou les coordonnees objets */
    transform_point(out,m,in);
    if (out[3]==0.0)
       return GL_FALSE;
    *objx=out[0]/out[3];
    *objy=out[1]/out[3];
    *objz=out[2]/out[3];
    return GL_TRUE;
}

void CPortalsRender::Draw3D()
{
	if(!portals.show_3d || portals.portal_count < 1)
		return;

	g_QglTable.m_pfn_qglPushAttrib(GL_ALL_ATTRIB_BITS);

	double cam[3];
	double proj_m[16];
	double model_m[16];
	float min_check[3];
	float max_check[3];
	float trans = (100.0f - portals.trans_3d) / 100.0f;
	int view[4];

	g_QglTable.m_pfn_qglGetDoublev(GL_PROJECTION_MATRIX, proj_m);
	g_QglTable.m_pfn_qglGetDoublev(GL_MODELVIEW_MATRIX, model_m);
	g_QglTable.m_pfn_qglGetIntegerv(GL_VIEWPORT, view);

	UnProject(0.5 * (double)view[2], 0.5 * (double)view[3], 0.0, model_m, proj_m, view, cam, cam+1, cam+2);

	min_check[0] = (float)cam[0] + (portals.clip_range * 64.0f);
	min_check[1] = (float)cam[1] + (portals.clip_range * 64.0f);
	min_check[2] = (float)cam[2] + (portals.clip_range * 64.0f);
	max_check[0] = (float)cam[0] - (portals.clip_range * 64.0f);
	max_check[1] = (float)cam[1] - (portals.clip_range * 64.0f);
	max_check[2] = (float)cam[2] - (portals.clip_range * 64.0f);

	g_QglTable.m_pfn_qglHint(GL_FOG_HINT, GL_NICEST);
	
	g_QglTable.m_pfn_qglDisable(GL_CULL_FACE);

	g_QglTable.m_pfn_qglDisable(GL_LINE_SMOOTH);
	g_QglTable.m_pfn_qglDisable(GL_POLYGON_SMOOTH);

	g_QglTable.m_pfn_qglPolygonMode(GL_FRONT_AND_BACK, GL_FILL);

	g_QglTable.m_pfn_qglShadeModel(GL_SMOOTH);

	g_QglTable.m_pfn_qglEnable(GL_BLEND);
	g_QglTable.m_pfn_qglBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
	g_QglTable.m_pfn_qglEnable(GL_POLYGON_SMOOTH);

	if(portals.aa_3d)
		g_QglTable.m_pfn_qglEnable(GL_LINE_SMOOTH);
	else
		g_QglTable.m_pfn_qglDisable(GL_LINE_SMOOTH);

	if(portals.fog)
	{
		g_QglTable.m_pfn_qglEnable(GL_FOG);

		g_QglTable.m_pfn_qglFogi(GL_FOG_MODE, GL_EXP);
		g_QglTable.m_pfn_qglFogf(GL_FOG_DENSITY, 0.001f);
		g_QglTable.m_pfn_qglFogf(GL_FOG_START, 10.0f);
		g_QglTable.m_pfn_qglFogf(GL_FOG_END, 10000.0f);
		g_QglTable.m_pfn_qglFogi(GL_FOG_INDEX, 0);
		g_QglTable.m_pfn_qglFogfv(GL_FOG_COLOR, portals.fp_color_fog);
	}
	else
	{
		g_QglTable.m_pfn_qglDisable(GL_FOG);
	}

	switch(portals.zbuffer)
	{
	case 1:
		g_QglTable.m_pfn_qglEnable(GL_DEPTH_TEST);
		g_QglTable.m_pfn_qglDepthMask(GL_FALSE);
		break;
	case 2:
		g_QglTable.m_pfn_qglDisable(GL_DEPTH_TEST);
		break;
	default:
		g_QglTable.m_pfn_qglEnable(GL_DEPTH_TEST);
		g_QglTable.m_pfn_qglDepthMask(GL_TRUE);
	}

	g_QglTable.m_pfn_qglLineWidth(portals.width_3d * 0.5f);

	unsigned int n, p;

	if(portals.polygons)
	{
		if(portals.zbuffer != 0)
		{
			float d;

			for(n = 0; n < portals.portal_count; n++)
			{
				d = (float)cam[0] - portals.portal[n].center.p[0];
				portals.portal[n].dist = d * d;

				d = (float)cam[1] - portals.portal[n].center.p[1];
				portals.portal[n].dist += d * d;

				d = (float)cam[2] - portals.portal[n].center.p[2];
				portals.portal[n].dist += d * d;

				portals.portal_sort[n] = n;
			}

			qsort(portals.portal_sort, portals.portal_count, 4, compare);
					
			for(n = 0; n < portals.portal_count; n++)
			{
				if(portals.polygons == 2 && !portals.portal[portals.portal_sort[n]].hint)
					continue;
	
				if(portals.clip)
				{
					if(min_check[0] < portals.portal[portals.portal_sort[n]].min[0])
						continue;
					else if(min_check[1] < portals.portal[portals.portal_sort[n]].min[1])
						continue;
					else if(min_check[2] < portals.portal[portals.portal_sort[n]].min[2])
						continue;
					else if(max_check[0] > portals.portal[portals.portal_sort[n]].max[0])
						continue;
					else if(max_check[1] > portals.portal[portals.portal_sort[n]].max[1])
						continue;
					else if(max_check[2] > portals.portal[portals.portal_sort[n]].max[2])
						continue;
				}

				g_QglTable.m_pfn_qglColor4f(portals.portal[portals.portal_sort[n]].fp_color_random[0], portals.portal[portals.portal_sort[n]].fp_color_random[1],
					portals.portal[portals.portal_sort[n]].fp_color_random[2], trans);

				g_QglTable.m_pfn_qglBegin(GL_POLYGON);

					for(p = 0; p < portals.portal[portals.portal_sort[n]].point_count; p++)
						g_QglTable.m_pfn_qglVertex3fv(portals.portal[portals.portal_sort[n]].point[p].p);

				g_QglTable.m_pfn_qglEnd();
			}
		}
		else
		{
			for(n = 0; n < portals.portal_count; n++)
			{
				if(portals.polygons == 2 && !portals.portal[n].hint)
					continue;

				if(portals.clip)
				{
					if(min_check[0] < portals.portal[n].min[0])
						continue;
					else if(min_check[1] < portals.portal[n].min[1])
						continue;
					else if(min_check[2] < portals.portal[n].min[2])
						continue;
					else if(max_check[0] > portals.portal[n].max[0])
						continue;
					else if(max_check[1] > portals.portal[n].max[1])
						continue;
					else if(max_check[2] > portals.portal[n].max[2])
						continue;
				}

				g_QglTable.m_pfn_qglColor4f(portals.portal[n].fp_color_random[0], portals.portal[n].fp_color_random[1],
					portals.portal[n].fp_color_random[2], trans);

				g_QglTable.m_pfn_qglBegin(GL_POLYGON);

					for(p = 0; p < portals.portal[n].point_count; p++)
						g_QglTable.m_pfn_qglVertex3fv(portals.portal[n].point[p].p);

				g_QglTable.m_pfn_qglEnd();
			}
		}
	}

	if(portals.lines)
	{
		g_QglTable.m_pfn_qglColor4fv(portals.fp_color_3d);

		for(n = 0; n < portals.portal_count; n++)
		{
			if(portals.lines == 2 && !portals.portal[n].hint)
				continue;

			if(portals.clip)
			{
				if(min_check[0] < portals.portal[n].min[0])
					continue;
				else if(min_check[1] < portals.portal[n].min[1])
					continue;
				else if(min_check[2] < portals.portal[n].min[2])
					continue;
				else if(max_check[0] > portals.portal[n].max[0])
					continue;
				else if(max_check[1] > portals.portal[n].max[1])
					continue;
				else if(max_check[2] > portals.portal[n].max[2])
					continue;
			}

			g_QglTable.m_pfn_qglBegin(GL_LINE_LOOP);

			for(p = 0; p < portals.portal[n].point_count; p++)
				g_QglTable.m_pfn_qglVertex3fv(portals.portal[n].inner_point[p].p);

			g_QglTable.m_pfn_qglEnd();
		}
	}

	g_QglTable.m_pfn_qglPopAttrib();
}