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gtkradiant/contrib/gtkgensurf/face.cpp
TTimo 12b372f89c ok 
git-svn-id: svn://svn.icculus.org/gtkradiant/GtkRadiant@1 8a3a26a2-13c4-0310-b231-cf6edde360e5
2006-02-10 22:01:20 +00:00

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/*
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 <stdlib.h>
#include <math.h>
#include "gensurf.h"
#define MAX_FACES 128 // Maximum number of faces on a brush
#define MAX_POINTS_ON_WINDING 64
#define SIDE_FRONT 0
#define SIDE_ON 2
#define SIDE_BACK 1
#define SIDE_CROSS -2
//vec3 vec3_origin = {0,0,0};
void PlaneFromPoints (float *p0, float *p1, float *p2, PLANE *plane)
{
vec3 t1, t2;
vec length;
VectorSubtract (p0, p1, t1);
VectorSubtract (p2, p1, t2);
plane->normal[0] = t1[1]*t2[2] - t1[2]*t2[1];
plane->normal[1] = t1[2]*t2[0] - t1[0]*t2[2];
plane->normal[2] = t1[0]*t2[1] - t1[1]*t2[0];
length = (vec)(sqrt(plane->normal[0]*plane->normal[0] +
plane->normal[1]*plane->normal[1] +
plane->normal[2]*plane->normal[2] ));
if (length == 0)
{
VectorClear(plane->normal);
}
else
{
plane->normal[0] /= length;
plane->normal[1] /= length;
plane->normal[2] /= length;
}
plane->dist = DotProduct (p0, plane->normal);
}
/*
void VectorMA (vec3 va, vec scale, vec3 vb, vec3 vc)
{
vc[0] = va[0] + scale*vb[0];
vc[1] = va[1] + scale*vb[1];
vc[2] = va[2] + scale*vb[2];
}
void CrossProduct (vec3 v1, vec3 v2, vec3 cross)
{
cross[0] = v1[1]*v2[2] - v1[2]*v2[1];
cross[1] = v1[2]*v2[0] - v1[0]*v2[2];
cross[2] = v1[0]*v2[1] - v1[1]*v2[0];
}
*/
/*
=============
AllocWinding
=============
*/
MY_WINDING *AllocWinding (int points)
{
MY_WINDING *w;
int s;
s = sizeof(vec)*3*points + sizeof(int);
w = (MY_WINDING*)malloc (s);
memset (w, 0, s);
return w;
}
/*
vec VectorNormalize (vec3 in, vec3 out)
{
vec length, ilength;
length = (vec)(sqrt (in[0]*in[0] + in[1]*in[1] + in[2]*in[2]));
if (length == 0)
{
VectorClear (out);
return 0;
}
ilength = (vec)1.0/length;
out[0] = in[0]*ilength;
out[1] = in[1]*ilength;
out[2] = in[2]*ilength;
return length;
}
*/
/*
=================
BaseWindingForPlane
=================
*/
MY_WINDING *BaseWindingForPlane (vec3 normal, vec dist)
{
int i, x;
vec max, v;
vec3 org, vright, vup;
MY_WINDING *w;
// find the major axis
max = -BOGUS_RANGE;
x = -1;
for (i=0 ; i<3; i++)
{
v = (vec)(fabs(normal[i]));
if (v > max)
{
x = i;
max = v;
}
}
if (x==-1) x = 2;
VectorCopy(vec3_origin,vup);
switch (x)
{
case 0:
case 1:
vup[2] = 1;
break;
case 2:
vup[0] = 1;
break;
}
v = DotProduct (vup, normal);
VectorMA (vup, -v, normal, vup);
VectorNormalize (vup, vup);
VectorScale (normal, dist, org);
CrossProduct (vup, normal, vright);
VectorScale (vup, 65536, vup);
VectorScale (vright, 65536, vright);
// project a really big axis aligned box onto the plane
w = AllocWinding (4);
VectorSubtract (org, vright, w->p[0]);
VectorAdd (w->p[0], vup, w->p[0]);
VectorAdd (org, vright, w->p[1]);
VectorAdd (w->p[1], vup, w->p[1]);
VectorAdd (org, vright, w->p[2]);
VectorSubtract (w->p[2], vup, w->p[2]);
VectorSubtract (org, vright, w->p[3]);
VectorSubtract (w->p[3], vup, w->p[3]);
w->numpoints = 4;
return w;
}
void FreeWinding (MY_WINDING *w)
{
if (*(unsigned *)w == 0xdeaddead)
// Error ("FreeWinding: freed a freed winding");
return;
*(unsigned *)w = 0xdeaddead;
free (w);
}
/*
=============
ChopWindingInPlace
=============
*/
void ChopWindingInPlace (MY_WINDING **inout, vec3 normal, vec dist, vec epsilon)
{
MY_WINDING *in;
vec dists[MAX_POINTS_ON_WINDING+4];
int sides[MAX_POINTS_ON_WINDING+4];
int counts[3];
static vec dot; // VC 4.2 optimizer bug if not static
int i, j;
vec *p1, *p2;
vec3 mid;
MY_WINDING *f;
int maxpts;
in = *inout;
counts[0] = counts[1] = counts[2] = 0;
// determine sides for each point
for (i=0 ; i<in->numpoints ; i++)
{
dot = DotProduct (in->p[i], normal);
dot -= dist;
dists[i] = dot;
if (dot > epsilon)
sides[i] = SIDE_FRONT;
else if (dot < -epsilon)
sides[i] = SIDE_BACK;
else
{
sides[i] = SIDE_ON;
}
counts[sides[i]]++;
}
sides[i] = sides[0];
dists[i] = dists[0];
if (!counts[0])
{
FreeWinding(in);
*inout = NULL;
return;
}
if (!counts[1])
return; // inout stays the same
maxpts = in->numpoints+4; // cant use counts[0]+2 because
// of fp grouping errors
f = AllocWinding (maxpts);
for (i=0 ; i<in->numpoints ; i++)
{
p1 = in->p[i];
if (sides[i] == SIDE_ON)
{
VectorCopy (p1, f->p[f->numpoints]);
f->numpoints++;
continue;
}
if (sides[i] == SIDE_FRONT)
{
VectorCopy (p1, f->p[f->numpoints]);
f->numpoints++;
}
if (sides[i+1] == SIDE_ON || sides[i+1] == sides[i])
continue;
// generate a split point
p2 = in->p[(i+1)%in->numpoints];
dot = dists[i] / (dists[i]-dists[i+1]);
for (j=0 ; j<3 ; j++)
{ // avoid round off error when possible
if (normal[j] == 1)
mid[j] = dist;
else if (normal[j] == -1)
mid[j] = -dist;
else
mid[j] = p1[j] + dot*(p2[j]-p1[j]);
}
VectorCopy (mid, f->p[f->numpoints]);
f->numpoints++;
}
// if (f->numpoints > maxpts)
// Error ("ClipWinding: points exceeded estimate");
// if (f->numpoints > MAX_POINTS_ON_WINDING)
// Error ("ClipWinding: MAX_POINTS_ON_WINDING");
FreeWinding(in);
*inout = f;
}
void UseFaceBounds()
{
LPVOID vp;
float Dot, BestDot;
float planepts[3][3];
int BestFace;
int i, j;
int NumFaces;
vec3 SurfNormal;
vec3 vmin,vmax;
PLANE plane[MAX_FACES*2];
PLANE pface;
MY_WINDING *w;
switch(Plane)
{
case PLANE_XY1:
SurfNormal[0] = 0.0;
SurfNormal[1] = 0.0;
SurfNormal[2] =-1.0;
break;
case PLANE_XZ0:
SurfNormal[0] = 0.0;
SurfNormal[1] = 1.0;
SurfNormal[2] = 0.0;
break;
case PLANE_XZ1:
SurfNormal[0] = 0.0;
SurfNormal[1] =-1.0;
SurfNormal[2] = 0.0;
break;
case PLANE_YZ0:
SurfNormal[0] = 1.0;
SurfNormal[1] = 0.0;
SurfNormal[2] = 0.0;
break;
case PLANE_YZ1:
SurfNormal[0] =-1.0;
SurfNormal[1] = 0.0;
SurfNormal[2] = 0.0;
break;
default:
SurfNormal[0] = 0.0;
SurfNormal[1] = 0.0;
SurfNormal[2] = 1.0;
}
#if 0
i = g_FuncTable.m_pfnAllocateSelectedBrushHandles();
vp = g_FuncTable.m_pfnGetSelectedBrushHandle(0);
NumFaces = g_FuncTable.m_pfnGetFaceCount(vp);
BestFace = -1;
BestDot = 0.0;
for(i=0; i<NumFaces; i++)
{
_QERFaceData* QERFaceData = g_FuncTable.m_pfnGetFaceData(vp,i);
planepts[0][0] = QERFaceData->m_v1[0];
planepts[0][1] = QERFaceData->m_v1[1];
planepts[0][2] = QERFaceData->m_v1[2];
planepts[1][0] = QERFaceData->m_v2[0];
planepts[1][1] = QERFaceData->m_v2[1];
planepts[1][2] = QERFaceData->m_v2[2];
planepts[2][0] = QERFaceData->m_v3[0];
planepts[2][1] = QERFaceData->m_v3[1];
planepts[2][2] = QERFaceData->m_v3[2];
PlaneFromPoints (planepts[0], planepts[1], planepts[2], &plane[2*i]);
VectorSubtract (vec3_origin, plane[2*i].normal, plane[2*i+1].normal);
plane[2*i+1].dist = -plane[2*i].dist;
Dot = DotProduct(plane[2*i].normal,SurfNormal);
if(Dot > BestDot)
{
BestDot = Dot;
BestFace = i;
if(strlen(QERFaceData->m_TextureName))
strcpy(Texture[Game][0],QERFaceData->m_TextureName);
}
}
for(i=0; i<NumFaces; i++)
{
if(i==BestFace) continue;
_QERFaceData* QERFaceData = g_FuncTable.m_pfnGetFaceData(vp,i);
if(strlen(QERFaceData->m_TextureName))
{
if(strcmp(Texture[Game][0],QERFaceData->m_TextureName))
strcpy(Texture[Game][1],QERFaceData->m_TextureName);
}
}
g_FuncTable.m_pfnReleaseSelectedBrushHandles();
w = BaseWindingForPlane (plane[BestFace*2].normal, plane[BestFace*2].dist);
for (i=0 ; i<NumFaces && w; i++)
{
if (BestFace == i)
continue;
ChopWindingInPlace (&w, plane[i*2+1].normal, plane[i*2+1].dist, 0);
}
if(!w) return;
// Get bounding box for this face
vmin[0] = vmax[0] = w->p[0][0];
vmin[1] = vmax[1] = w->p[0][1];
vmin[2] = vmax[2] = w->p[0][2];
for(j=1; j<w->numpoints; j++)
{
vmin[0] = min(vmin[0],w->p[j][0]);
vmin[1] = min(vmin[1],w->p[j][1]);
vmin[2] = min(vmin[2],w->p[j][2]);
vmax[0] = max(vmax[0],w->p[j][0]);
vmax[1] = max(vmax[1],w->p[j][1]);
vmax[2] = max(vmax[2],w->p[j][2]);
}
FreeWinding(w);
VectorCopy(plane[BestFace*2].normal,pface.normal);
pface.dist = plane[BestFace*2].dist;
switch(Plane)
{
case PLANE_XZ0:
case PLANE_XZ1:
if(pface.normal[1] == 0.) return;
Hll = vmin[0];
Hur = vmax[0];
Vll = vmin[2];
Vur = vmax[2];
Z00 = (pface.dist - pface.normal[0]*Hll - pface.normal[2]*Vll)/pface.normal[1];
Z01 = (pface.dist - pface.normal[0]*Hll - pface.normal[2]*Vur)/pface.normal[1];
Z10 = (pface.dist - pface.normal[0]*Hur - pface.normal[2]*Vll)/pface.normal[1];
Z11 = (pface.dist - pface.normal[0]*Hur - pface.normal[2]*Vur)/pface.normal[1];
break;
case PLANE_YZ0:
case PLANE_YZ1:
if(pface.normal[0] == 0.) return;
Hll = vmin[1];
Hur = vmax[1];
Vll = vmin[2];
Vur = vmax[2];
Z00 = (pface.dist - pface.normal[1]*Hll - pface.normal[2]*Vll)/pface.normal[0];
Z01 = (pface.dist - pface.normal[1]*Hll - pface.normal[2]*Vur)/pface.normal[0];
Z10 = (pface.dist - pface.normal[1]*Hur - pface.normal[2]*Vll)/pface.normal[0];
Z11 = (pface.dist - pface.normal[1]*Hur - pface.normal[2]*Vur)/pface.normal[0];
break;
default:
if(pface.normal[2] == 0.) return;
Hll = vmin[0];
Hur = vmax[0];
Vll = vmin[1];
Vur = vmax[1];
Z00 = (pface.dist - pface.normal[0]*Hll - pface.normal[1]*Vll)/pface.normal[2];
Z01 = (pface.dist - pface.normal[0]*Hll - pface.normal[1]*Vur)/pface.normal[2];
Z10 = (pface.dist - pface.normal[0]*Hur - pface.normal[1]*Vll)/pface.normal[2];
Z11 = (pface.dist - pface.normal[0]*Hur - pface.normal[1]*Vur)/pface.normal[2];
}
#endif
}
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