cm_load.c

quakeIII源码这个不用我多说吧

/*
===========================================================================
Copyright (C) 1999-2005 Id Software, Inc.

This file is part of Quake III Arena source code.

Quake III Arena source code is free software; you can redistribute it
and/or modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the License,
or (at your option) any later version.

Quake III Arena source code 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 General Public License for more details.

You should have received a copy of the GNU General Public License
along with Foobar; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
===========================================================================
*/
// cmodel.c -- model loading

#include "cm_local.h"

#ifdef BSPC

#include "../bspc/l_qfiles.h"

void SetPlaneSignbits (cplane_t *out) {
	int	bits, j;

	// for fast box on planeside test
	bits = 0;
	for (j=0 ; j<3 ; j++) {
		if (out->normal[j] < 0) {
			bits |= 1<<j;
		}
	}
	out->signbits = bits;
}
#endif //BSPC

// to allow boxes to be treated as brush models, we allocate
// some extra indexes along with those needed by the map
#define	BOX_BRUSHES		1
#define	BOX_SIDES		6
#define	BOX_LEAFS		2
#define	BOX_PLANES		12

#define	LL(x) x=LittleLong(x)


clipMap_t	cm;
int			c_pointcontents;
int			c_traces, c_brush_traces, c_patch_traces;


byte		*cmod_base;

#ifndef BSPC
cvar_t		*cm_noAreas;
cvar_t		*cm_noCurves;
cvar_t		*cm_playerCurveClip;
#endif

cmodel_t	box_model;
cplane_t	*box_planes;
cbrush_t	*box_brush;



void	CM_InitBoxHull (void);
void	CM_FloodAreaConnections (void);


/*
===============================================================================

					MAP LOADING

===============================================================================
*/

/*
=================
CMod_LoadShaders
=================
*/
void CMod_LoadShaders( lump_t *l ) {
	dshader_t	*in, *out;
	int			i, count;

	in = (void *)(cmod_base + l->fileofs);
	if (l->filelen % sizeof(*in)) {
		Com_Error (ERR_DROP, "CMod_LoadShaders: funny lump size");
	}
	count = l->filelen / sizeof(*in);

	if (count < 1) {
		Com_Error (ERR_DROP, "Map with no shaders");
	}
	cm.shaders = Hunk_Alloc( count * sizeof( *cm.shaders ), h_high );
	cm.numShaders = count;

	Com_Memcpy( cm.shaders, in, count * sizeof( *cm.shaders ) );

	out = cm.shaders;
	for ( i=0 ; i<count ; i++, in++, out++ ) {
		out->contentFlags = LittleLong( out->contentFlags );
		out->surfaceFlags = LittleLong( out->surfaceFlags );
	}
}


/*
=================
CMod_LoadSubmodels
=================
*/
void CMod_LoadSubmodels( lump_t *l ) {
	dmodel_t	*in;
	cmodel_t	*out;
	int			i, j, count;
	int			*indexes;

	in = (void *)(cmod_base + l->fileofs);
	if (l->filelen % sizeof(*in))
		Com_Error (ERR_DROP, "CMod_LoadSubmodels: funny lump size");
	count = l->filelen / sizeof(*in);

	if (count < 1)
		Com_Error (ERR_DROP, "Map with no models");
	cm.cmodels = Hunk_Alloc( count * sizeof( *cm.cmodels ), h_high );
	cm.numSubModels = count;

	if ( count > MAX_SUBMODELS ) {
		Com_Error( ERR_DROP, "MAX_SUBMODELS exceeded" );
	}

	for ( i=0 ; i<count ; i++, in++, out++)
	{
		out = &cm.cmodels[i];

		for (j=0 ; j<3 ; j++)
		{	// spread the mins / maxs by a pixel
			out->mins[j] = LittleFloat (in->mins[j]) - 1;
			out->maxs[j] = LittleFloat (in->maxs[j]) + 1;
		}

		if ( i == 0 ) {
			continue;	// world model doesn't need other info
		}

		// make a "leaf" just to hold the model's brushes and surfaces
		out->leaf.numLeafBrushes = LittleLong( in->numBrushes );
		indexes = Hunk_Alloc( out->leaf.numLeafBrushes * 4, h_high );
		out->leaf.firstLeafBrush = indexes - cm.leafbrushes;
		for ( j = 0 ; j < out->leaf.numLeafBrushes ; j++ ) {
			indexes[j] = LittleLong( in->firstBrush ) + j;
		}

		out->leaf.numLeafSurfaces = LittleLong( in->numSurfaces );
		indexes = Hunk_Alloc( out->leaf.numLeafSurfaces * 4, h_high );
		out->leaf.firstLeafSurface = indexes - cm.leafsurfaces;
		for ( j = 0 ; j < out->leaf.numLeafSurfaces ; j++ ) {
			indexes[j] = LittleLong( in->firstSurface ) + j;
		}
	}
}


/*
=================
CMod_LoadNodes

=================
*/
void CMod_LoadNodes( lump_t *l ) {
	dnode_t		*in;
	int			child;
	cNode_t		*out;
	int			i, j, count;
	
	in = (void *)(cmod_base + l->fileofs);
	if (l->filelen % sizeof(*in))
		Com_Error (ERR_DROP, "MOD_LoadBmodel: funny lump size");
	count = l->filelen / sizeof(*in);

	if (count < 1)
		Com_Error (ERR_DROP, "Map has no nodes");
	cm.nodes = Hunk_Alloc( count * sizeof( *cm.nodes ), h_high );
	cm.numNodes = count;

	out = cm.nodes;

	for (i=0 ; i<count ; i++, out++, in++)
	{
		out->plane = cm.planes + LittleLong( in->planeNum );
		for (j=0 ; j<2 ; j++)
		{
			child = LittleLong (in->children[j]);
			out->children[j] = child;
		}
	}

}

/*
=================
CM_BoundBrush

=================
*/
void CM_BoundBrush( cbrush_t *b ) {
	b->bounds[0][0] = -b->sides[0].plane->dist;
	b->bounds[1][0] = b->sides[1].plane->dist;

	b->bounds[0][1] = -b->sides[2].plane->dist;
	b->bounds[1][1] = b->sides[3].plane->dist;

	b->bounds[0][2] = -b->sides[4].plane->dist;
	b->bounds[1][2] = b->sides[5].plane->dist;
}


/*
=================
CMod_LoadBrushes

=================
*/
void CMod_LoadBrushes( lump_t *l ) {
	dbrush_t	*in;
	cbrush_t	*out;
	int			i, count;

	in = (void *)(cmod_base + l->fileofs);
	if (l->filelen % sizeof(*in)) {
		Com_Error (ERR_DROP, "MOD_LoadBmodel: funny lump size");
	}
	count = l->filelen / sizeof(*in);

	cm.brushes = Hunk_Alloc( ( BOX_BRUSHES + count ) * sizeof( *cm.brushes ), h_high );
	cm.numBrushes = count;

	out = cm.brushes;

	for ( i=0 ; i<count ; i++, out++, in++ ) {
		out->sides = cm.brushsides + LittleLong(in->firstSide);
		out->numsides = LittleLong(in->numSides);

		out->shaderNum = LittleLong( in->shaderNum );
		if ( out->shaderNum < 0 || out->shaderNum >= cm.numShaders ) {
			Com_Error( ERR_DROP, "CMod_LoadBrushes: bad shaderNum: %i", out->shaderNum );
		}
		out->contents = cm.shaders[out->shaderNum].contentFlags;

		CM_BoundBrush( out );
	}

}

/*
=================
CMod_LoadLeafs
=================
*/
void CMod_LoadLeafs (lump_t *l)
{
	int			i;
	cLeaf_t		*out;
	dleaf_t 	*in;
	int			count;
	
	in = (void *)(cmod_base + l->fileofs);
	if (l->filelen % sizeof(*in))
		Com_Error (ERR_DROP, "MOD_LoadBmodel: funny lump size");
	count = l->filelen / sizeof(*in);

	if (count < 1)
		Com_Error (ERR_DROP, "Map with no leafs");

	cm.leafs = Hunk_Alloc( ( BOX_LEAFS + count ) * sizeof( *cm.leafs ), h_high );
	cm.numLeafs = count;

	out = cm.leafs;	
	for ( i=0 ; i<count ; i++, in++, out++)
	{
		out->cluster = LittleLong (in->cluster);
		out->area = LittleLong (in->area);
		out->firstLeafBrush = LittleLong (in->firstLeafBrush);
		out->numLeafBrushes = LittleLong (in->numLeafBrushes);
		out->firstLeafSurface = LittleLong (in->firstLeafSurface);
		out->numLeafSurfaces = LittleLong (in->numLeafSurfaces);

		if (out->cluster >= cm.numClusters)
			cm.numClusters = out->cluster + 1;
		if (out->area >= cm.numAreas)
			cm.numAreas = out->area + 1;
	}

	cm.areas = Hunk_Alloc( cm.numAreas * sizeof( *cm.areas ), h_high );
	cm.areaPortals = Hunk_Alloc( cm.numAreas * cm.numAreas * sizeof( *cm.areaPortals ), h_high );
}

/*
=================
CMod_LoadPlanes
=================
*/
void CMod_LoadPlanes (lump_t *l)
{
	int			i, j;
	cplane_t	*out;
	dplane_t 	*in;
	int			count;
	int			bits;
	
	in = (void *)(cmod_base + l->fileofs);
	if (l->filelen % sizeof(*in))
		Com_Error (ERR_DROP, "MOD_LoadBmodel: funny lump size");
	count = l->filelen / sizeof(*in);

	if (count < 1)
		Com_Error (ERR_DROP, "Map with no planes");
	cm.planes = Hunk_Alloc( ( BOX_PLANES + count ) * sizeof( *cm.planes ), h_high );
	cm.numPlanes = count;

	out = cm.planes;	

	for ( i=0 ; i<count ; i++, in++, out++)
	{
		bits = 0;
		for (j=0 ; j<3 ; j++)
		{
			out->normal[j] = LittleFloat (in->normal[j]);
			if (out->normal[j] < 0)
				bits |= 1<<j;
		}

		out->dist = LittleFloat (in->dist);
		out->type = PlaneTypeForNormal( out->normal );
		out->signbits = bits;
	}
}

/*
=================
CMod_LoadLeafBrushes
=================
*/
void CMod_LoadLeafBrushes (lump_t *l)
{
	int			i;
	int			*out;
	int		 	*in;
	int			count;
	
	in = (void *)(cmod_base + l->fileofs);
	if (l->filelen % sizeof(*in))
		Com_Error (ERR_DROP, "MOD_LoadBmodel: funny lump size");
	count = l->filelen / sizeof(*in);

	cm.leafbrushes = Hunk_Alloc( (count + BOX_BRUSHES) * sizeof( *cm.leafbrushes ), h_high );
	cm.numLeafBrushes = count;

	out = cm.leafbrushes;

	for ( i=0 ; i<count ; i++, in++, out++) {
		*out = LittleLong (*in);
	}
}

/*
=================
CMod_LoadLeafSurfaces
=================
*/
void CMod_LoadLeafSurfaces( lump_t *l )
{
	int			i;
	int			*out;
	int		 	*in;
	int			count;
	
	in = (void *)(cmod_base + l->fileofs);
	if (l->filelen % sizeof(*in))
		Com_Error (ERR_DROP, "MOD_LoadBmodel: funny lump size");
	count = l->filelen / sizeof(*in);

	cm.leafsurfaces = Hunk_Alloc( count * sizeof( *cm.leafsurfaces ), h_high );
	cm.numLeafSurfaces = count;

	out = cm.leafsurfaces;

	for ( i=0 ; i<count ; i++, in++, out++) {
		*out = LittleLong (*in);
	}
}

/*
=================
CMod_LoadBrushSides
=================
*/
void CMod_LoadBrushSides (lump_t *l)
{
	int				i;
	cbrushside_t	*out;
	dbrushside_t 	*in;
	int				count;
	int				num;

	in = (void *)(cmod_base + l->fileofs);
	if ( l->filelen % sizeof(*in) ) {
		Com_Error (ERR_DROP, "MOD_LoadBmodel: funny lump size");
	}
	count = l->filelen / sizeof(*in);