brush.c

quake3工具源码。包括生成bsp文件

#include "qbsp.h"


int		c_active_brushes;

int		c_nodes;

// if a brush just barely pokes onto the other side,
// let it slide by without chopping
#define	PLANESIDE_EPSILON	0.001
//0.1




/*
================
CountBrushList
================
*/
int	CountBrushList (bspbrush_t *brushes)
{
	int	c;

	c = 0;
	for ( ; brushes ; brushes = brushes->next)
		c++;
	return c;
}


/*
================
AllocBrush
================
*/
bspbrush_t *AllocBrush (int numsides)
{
	bspbrush_t	*bb;
	int			c;

	c = (int)&(((bspbrush_t *)0)->sides[numsides]);
	bb = malloc(c);
	memset (bb, 0, c);
	if (numthreads == 1)
		c_active_brushes++;
	return bb;
}

/*
================
FreeBrush
================
*/
void FreeBrush (bspbrush_t *brushes)
{
	int			i;

	for (i=0 ; i<brushes->numsides ; i++)
		if (brushes->sides[i].winding)
			FreeWinding(brushes->sides[i].winding);
	free (brushes);
	if (numthreads == 1)
		c_active_brushes--;
}


/*
================
FreeBrushList
================
*/
void FreeBrushList (bspbrush_t *brushes)
{
	bspbrush_t	*next;

	for ( ; brushes ; brushes = next)
	{
		next = brushes->next;

		FreeBrush (brushes);
	}		
}

/*
==================
CopyBrush

Duplicates the brush, the sides, and the windings
==================
*/
bspbrush_t *CopyBrush (bspbrush_t *brush)
{
	bspbrush_t *newbrush;
	int			size;
	int			i;
	
	size = (int)&(((bspbrush_t *)0)->sides[brush->numsides]);

	newbrush = AllocBrush (brush->numsides);
	memcpy (newbrush, brush, size);

	for (i=0 ; i<brush->numsides ; i++)
	{
		if (brush->sides[i].winding)
			newbrush->sides[i].winding = CopyWinding (brush->sides[i].winding);
	}

	return newbrush;
}


/*
================
DrawBrushList
================
*/
void DrawBrushList (bspbrush_t *brush)
{
	int		i;
	side_t	*s;

	GLS_BeginScene ();
	for ( ; brush ; brush=brush->next)
	{
		for (i=0 ; i<brush->numsides ; i++)
		{
			s = &brush->sides[i];
			if (!s->winding)
				continue;
			GLS_Winding (s->winding, 0);
		}
	}
	GLS_EndScene ();
}



/*
================
WriteBrushList
================
*/
void WriteBrushList (char *name, bspbrush_t *brush, qboolean onlyvis)
{
	int		i;
	side_t	*s;
	FILE	*f;

	qprintf ("writing %s\n", name);
	f = SafeOpenWrite (name);

	for ( ; brush ; brush=brush->next)
	{
		for (i=0 ; i<brush->numsides ; i++)
		{
			s = &brush->sides[i];
			if (!s->winding)
				continue;
			if (onlyvis && !s->visible)
				continue;
			OutputWinding (brush->sides[i].winding, f);
		}
	}

	fclose (f);
}


/*
=============
PrintBrush
=============
*/
void PrintBrush (bspbrush_t *brush)
{
	int		i;

	_printf ("brush: %p\n", brush);
	for (i=0;i<brush->numsides ; i++)
	{
		pw(brush->sides[i].winding);
		_printf ("\n");
	}
}

/*
==================
BoundBrush

Sets the mins/maxs based on the windings
returns false if the brush doesn't enclose a valid volume
==================
*/
qboolean BoundBrush (bspbrush_t *brush)
{
	int			i, j;
	winding_t	*w;

	ClearBounds (brush->mins, brush->maxs);
	for (i=0 ; i<brush->numsides ; i++)
	{
		w = brush->sides[i].winding;
		if (!w)
			continue;
		for (j=0 ; j<w->numpoints ; j++)
			AddPointToBounds (w->p[j], brush->mins, brush->maxs);
	}

	for (i=0 ; i<3 ; i++) {
		if (brush->mins[i] < MIN_WORLD_COORD || brush->maxs[i] > MAX_WORLD_COORD
			|| brush->mins[i] >= brush->maxs[i] ) {
			return qfalse;
		}
	}

	return qtrue;
}

/*
==================
CreateBrushWindings

makes basewindigs for sides and mins / maxs for the brush
returns false if the brush doesn't enclose a valid volume
==================
*/
qboolean CreateBrushWindings (bspbrush_t *brush)
{
	int			i, j;
	winding_t	*w;
	side_t		*side;
	plane_t		*plane;

	for (i=0 ; i<brush->numsides ; i++)
	{
		side = &brush->sides[i];
		plane = &mapplanes[side->planenum];
		w = BaseWindingForPlane (plane->normal, plane->dist);
		for (j=0 ; j<brush->numsides && w; j++)
		{
			if (i == j)
				continue;
			if ( brush->sides[j].planenum == ( brush->sides[i].planenum ^ 1 ) )
				continue;		// back side clipaway
			if (brush->sides[j].bevel)
				continue;
			if (brush->sides[j].backSide)
				continue;
			plane = &mapplanes[brush->sides[j].planenum^1];
			ChopWindingInPlace (&w, plane->normal, plane->dist, 0); //CLIP_EPSILON);
		}

		side->winding = w;
	}

	return BoundBrush (brush);
}

/*
==================
BrushFromBounds

Creates a new axial brush
==================
*/
bspbrush_t	*BrushFromBounds (vec3_t mins, vec3_t maxs)
{
	bspbrush_t	*b;
	int			i;
	vec3_t		normal;
	vec_t		dist;

	b = AllocBrush (6);
	b->numsides = 6;
	for (i=0 ; i<3 ; i++)
	{
		VectorClear (normal);
		normal[i] = 1;
		dist = maxs[i];
		b->sides[i].planenum = FindFloatPlane (normal, dist);

		normal[i] = -1;
		dist = -mins[i];
		b->sides[3+i].planenum = FindFloatPlane (normal, dist);
	}

	CreateBrushWindings (b);

	return b;
}

/*
==================
BrushVolume

==================
*/
vec_t BrushVolume (bspbrush_t *brush)
{
	int			i;
	winding_t	*w;
	vec3_t		corner;
	vec_t		d, area, volume;
	plane_t		*plane;

	if (!brush)
		return 0;

	// grab the first valid point as the corner

	w = NULL;
	for (i=0 ; i<brush->numsides ; i++)
	{
		w = brush->sides[i].winding;
		if (w)
			break;
	}
	if (!w)
		return 0;
	VectorCopy (w->p[0], corner);

	// make tetrahedrons to all other faces

	volume = 0;
	for ( ; i<brush->numsides ; i++)
	{
		w = brush->sides[i].winding;
		if (!w)
			continue;
		plane = &mapplanes[brush->sides[i].planenum];
		d = -(DotProduct (corner, plane->normal) - plane->dist);
		area = WindingArea (w);
		volume += d*area;
	}

	volume /= 3;
	return volume;
}


/*
==================
WriteBspBrushMap
==================
*/
void WriteBspBrushMap (char *name, bspbrush_t *list)
{
	FILE	*f;
	side_t	*s;
	int		i;
	winding_t	*w;

	_printf ("writing %s\n", name);
	f = fopen (name, "wb");
	if (!f)
		Error ("Can't write %s\b", name);

	fprintf (f, "{\n\"classname\" \"worldspawn\"\n");

	for ( ; list ; list=list->next )
	{
		fprintf (f, "{\n");
		for (i=0,s=list->sides ; i<list->numsides ; i++,s++)
		{
			w = BaseWindingForPlane (mapplanes[s->planenum].normal, mapplanes[s->planenum].dist);

			fprintf (f,"( %i %i %i ) ", (int)w->p[0][0], (int)w->p[0][1], (int)w->p[0][2]);
			fprintf (f,"( %i %i %i ) ", (int)w->p[1][0], (int)w->p[1][1], (int)w->p[1][2]);
			fprintf (f,"( %i %i %i ) ", (int)w->p[2][0], (int)w->p[2][1], (int)w->p[2][2]);

			fprintf (f, "notexture 0 0 0 1 1\n" );
			FreeWinding (w);
		}
		fprintf (f, "}\n");
	}
	fprintf (f, "}\n");

	fclose (f);

}


//=====================================================================================

/*
====================
FilterBrushIntoTree_r

====================
*/
int FilterBrushIntoTree_r( bspbrush_t *b, node_t *node ) {
	bspbrush_t		*front, *back;
	int				c;

	if ( !b ) {
		return 0;
	}

	// add it to the leaf list
	if ( node->planenum == PLANENUM_LEAF ) {
		b->next = node->brushlist;
		node->brushlist = b;

		// classify the leaf by the structural brush
		if ( !b->detail ) {
			if ( b->opaque ) {
				node->opaque = qtrue;
				node->areaportal = qfalse;
			} else if ( b->contents & CONTENTS_AREAPORTAL ) {
				if ( !node->opaque ) {
					node->areaportal = qtrue;
				}
			}
		}

		return 1;