Support for pvs.

git-svn-id: https://svn.code.sf.net/p/fteqw/code/trunk@1352 fc73d0e0-1445-4013-8a0c-d673dee63da5
This commit is contained in:
Spoike 2005-09-24 04:45:02 +00:00
parent c86db94c76
commit 78c8fae297

348
fteqtv/bsp.c Normal file
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@ -0,0 +1,348 @@
#include "qtv.h"
#define MAX_MAP_LEAFS 32767
typedef struct {
float planen[3];
float planedist;
int child[2];
} node_t;
struct bsp_s {
node_t *nodes;
unsigned char *pvslump;
unsigned char **pvsofs;
unsigned char decpvs[(MAX_MAP_LEAFS+7)/8]; //decompressed pvs
int pvsbytecount;
};
typedef struct
{
int contents;
int visofs; // -1 = no visibility info
short mins[3]; // for frustum culling
short maxs[3];
unsigned short firstmarksurface;
unsigned short nummarksurfaces;
#define NUM_AMBIENTS 4
unsigned char ambient_level[NUM_AMBIENTS];
} dleaf_t;
typedef struct
{
unsigned int planenum;
short children[2]; // negative numbers are -(leafs+1), not nodes
short mins[3]; // for sphere culling
short maxs[3];
unsigned short firstface;
unsigned short numfaces; // counting both sides
} dnode_t;
typedef struct
{
float normal[3];
float dist;
unsigned int type; // PLANE_X - PLANE_ANYZ ?remove? trivial to regenerate
} dplane_t;
typedef struct
{
int fileofs, filelen;
} lump_t;
#define LUMP_PLANES 1
#define LUMP_VISIBILITY 4
#define LUMP_NODES 5
#define LUMP_LEAFS 10
#define HEADER_LUMPS 15
typedef struct
{
int version;
lump_t lumps[HEADER_LUMPS];
} dheader_t;
void DecompressVis(unsigned char *in, unsigned char *out, int bytecount)
{
int c;
unsigned char *end;
for (end = out + bytecount; out < end; )
{
c = *in;
if (!c)
{ //a 0 is always followed by the count of 0s.
c = in[1];
in += 2;
for (; c > 4; c-=4)
{
*(unsigned int*)out = 0;
out+=4;
}
for (; c; c--)
*out++ = 0;
}
else
{
in++;
*out++ = c;
}
}
}
typedef struct {
char name[56];
int offset;
int length;
} pakfile;
// PACK, offset, lengthofpakfiles
FILE *FindInPaks(char *gamedir, char *filename, int *size)
{
FILE *f;
char fname[1024];
int i, j;
int numfiles;
unsigned int header[3];
pakfile pf;
for (i = 0; ; i++)
{
sprintf(fname, "%s/pak%i.pak", gamedir, i);
f = fopen(fname, "rb");
if (!f)
return NULL; //ran out of possible pak files.
fread(header, 1, sizeof(header), f);
if (header[0] != *(unsigned int*)"PACK")
{ //err... hmm.
fclose(f);
continue;
}
numfiles = header[2]/sizeof(pakfile);
fseek(f, header[1], SEEK_SET);
for (j = 0; j < numfiles; j++)
{
fread(&pf, 1, sizeof(pf), f);
if (!strcmp(pf.name, filename))
{
fseek(f, pf.offset, 0);
*size = pf.length;
return f;
}
}
fclose(f);
//not found
}
return NULL;
}
unsigned char *ReadFile_WINDOWSSUCKS(char *gamedir, char *filename, int *size)
{
unsigned char *data;
FILE *f;
char fname[1024];
//try and read it straight out of the file system
sprintf(fname, "%s/%s", gamedir, filename);
f = fopen(fname, "rb");
if (!f)
f = fopen(filename, "rb"); //see if we're being run from inside the gamedir
if (!f)
{
f = FindInPaks(gamedir, filename, size);
if (!f)
f = FindInPaks("id1", filename, size);
if (!f)
{
printf("Couldn't open bsp file\n");
return NULL;
}
}
else
{
fseek(f, 0, SEEK_END);
*size = ftell(f);
fseek(f, 0, SEEK_SET);
}
data = malloc(*size);
fread(data, 1, *size, f);
fclose(f);
return data;
}
bsp_t *BSP_LoadModel(char *gamedir, char *bspname)
{
unsigned char *data;
unsigned int size;
dheader_t *header;
dplane_t *planes;
dnode_t *nodes;
dleaf_t *leaf;
int numnodes, i;
int numleafs;
bsp_t *bsp;
if (!gamedir)
gamedir = "qw";
data = ReadFile_WINDOWSSUCKS(gamedir, bspname, &size);
if (!data)
{
printf("Couldn't open bsp file \"%s\" (gamedir \"%s\")\n", bspname, gamedir);
return NULL;
}
header = (dheader_t*)data;
if (data[0] != 29)
{
printf("BSP not version 29\n", bspname, gamedir);
return NULL;
}
planes = (dplane_t*)(data+header->lumps[LUMP_PLANES].fileofs);
nodes = (dnode_t*)(data+header->lumps[LUMP_NODES].fileofs);
leaf = (dleaf_t*)(data+header->lumps[LUMP_LEAFS].fileofs);
numnodes = header->lumps[LUMP_NODES].filelen/sizeof(dnode_t);
numleafs = header->lumps[LUMP_LEAFS].filelen/sizeof(dleaf_t);
bsp = malloc(sizeof(bsp_t) + sizeof(node_t)*numnodes + header->lumps[LUMP_VISIBILITY].filelen + sizeof(unsigned char *)*numleafs);
bsp->nodes = (node_t*)(bsp+1);
bsp->pvsofs = (unsigned char**)(bsp->nodes+numnodes);
bsp->pvslump = (unsigned char*)(bsp->pvsofs+numleafs);
bsp->pvsbytecount = (numleafs+7)/8;
for (i = 0; i < numnodes; i++)
{
bsp->nodes[i].child[0] = nodes[i].children[0];
bsp->nodes[i].child[1] = nodes[i].children[1];
bsp->nodes[i].planedist = planes[nodes[i].planenum].dist;
bsp->nodes[i].planen[0] = planes[nodes[i].planenum].normal[0];
bsp->nodes[i].planen[1] = planes[nodes[i].planenum].normal[1];
bsp->nodes[i].planen[2] = planes[nodes[i].planenum].normal[2];
}
memcpy(bsp->pvslump, data+header->lumps[LUMP_VISIBILITY].fileofs, header->lumps[LUMP_VISIBILITY].filelen);
for (i = 0; i < numleafs; i++)
{
if (leaf[i].visofs < 0)
bsp->pvsofs[i] = NULL;
else
bsp->pvsofs[i] = bsp->pvslump+leaf[i].visofs;
}
free(data);
return bsp;
}
void BSP_Free(bsp_t *bsp)
{
free(bsp);
}
int BSP_SphereLeafNums_r(bsp_t *bsp, int first, int maxleafs, unsigned short *list, float *pos, float radius)
{
node_t *node;
float dot;
int rn;
int numleafs = 0;
if (!bsp)
return 0;
for(rn = first;rn >= 0;)
{
node = &bsp->nodes[rn];
dot = (node->planen[0]*pos[0] + node->planen[1]*pos[1] + node->planen[2]*pos[2]) - node->planedist;
if (dot < -radius)
rn = node->child[1];
else if (dot > radius)
rn = node->child[0];
else
{
rn = BSP_SphereLeafNums_r(bsp, node->child[0], maxleafs-numleafs, list+numleafs, pos, radius);
if (rn < 0)
return -1; //ran out, so don't use pvs for this entity.
else
numleafs += rn;
rn = node->child[1]; //both sides
}
}
rn = -1-rn;
if (maxleafs>numleafs)
{
list[numleafs] = rn-1;
numleafs++;
}
else
return -1; //there are just too many
return numleafs;
}
int BSP_SphereLeafNums(bsp_t *bsp, int maxleafs, unsigned short *list, float x, float y, float z, float radius)
{
float pos[3];
pos[0] = x;
pos[1] = y;
pos[2] = z;
return BSP_SphereLeafNums_r(bsp, 0, maxleafs, list, pos, radius);
}
int BSP_LeafNum(bsp_t *bsp, float x, float y, float z)
{
node_t *node;
float dot;
int rn;
if (!bsp)
return 0;
for(rn = 0;rn >= 0;)
{
node = &bsp->nodes[rn];
dot = node->planen[0]*x + node->planen[1]*y + node->planen[2]*z;
rn = node->child[(dot-node->planedist) <= 0];
}
return -1-rn;
}
qboolean BSP_Visible(bsp_t *bsp, int leafcount, unsigned short *list)
{
int i;
if (!bsp)
return true;
if (leafcount < 0) //too many, so pvs was switched off.
return true;
for (i = 0; i < leafcount; i++)
{
if (bsp->decpvs[list[i]>>3] & (1<<(list[i]&7)))
return true;
}
return false;
}
void BSP_SetupForPosition(bsp_t *bsp, float x, float y, float z)
{
int leafnum;
if (!bsp)
return;
leafnum = BSP_LeafNum(bsp, x, y, z);
DecompressVis(bsp->pvsofs[leafnum], bsp->decpvs, bsp->pvsbytecount);
}