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ericw-tools/vis/state.cc

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/* Copyright (C) 1996-1997 Id Software, Inc.
This program 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.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
See file, 'COPYING', for details.
*/
#include <stdint.h>
#include <stdio.h>
#ifdef LINUX
#include <unistd.h>
#endif
#include <vis/vis.hh>
#include <common/cmdlib.hh>
#define VIS_STATE_VERSION ('T' << 24 | 'Y' << 16 | 'R' << 8 | '1')
typedef struct {
uint32_t version;
uint32_t numportals;
uint32_t numleafs;
uint32_t testlevel;
uint32_t time_elapsed;
} dvisstate_t;
typedef struct {
uint32_t status;
uint32_t might;
uint32_t vis;
uint32_t nummightsee;
uint32_t numcansee;
} dportal_t;
static int
CompressBits(uint8_t *out, const leafbits_t *in)
{
int i, rep, shift, numbytes;
uint8_t val, repval, *dst;
dst = out;
numbytes = (portalleafs + 7) >> 3;
for (i = 0; i < numbytes && dst - out < numbytes; i++) {
shift = (i << 3) & LEAFMASK;
val = (in->bits[i >> (LEAFSHIFT - 3)] >> shift) & 0xff;
*dst++ = val;
if (val != 0 && val != 0xff)
continue;
if (dst - out >= numbytes)
break;
rep = 1;
for (i++; i < numbytes; i++) {
shift = (i << 3) & LEAFMASK;
repval = (in->bits[i >> (LEAFSHIFT - 3)] >> shift) & 0xff;
if (repval != val || rep == 255)
break;
rep++;
}
*dst++ = rep;
i--;
}
if (dst - out < numbytes)
return dst - out;
/* Compression ineffective, just copy the data */
dst = out;
for (i = 0; i < numbytes; i++) {
shift = (i << 3) & LEAFMASK;
*dst++ = (in->bits[i >> (LEAFSHIFT - 3)] >> shift) & 0xff;
}
return numbytes;
}
static void
DecompressBits(leafbits_t *dst, const uint8_t *src)
{
int i, rep, shift, numbytes;
uint8_t val;
numbytes = (portalleafs + 7) >> 3;
memset(dst->bits, 0, numbytes);
dst->numleafs = portalleafs;
for (i = 0; i < numbytes; i++) {
val = *src++;
shift = (i << 3) & LEAFMASK;
dst->bits[i >> (LEAFSHIFT - 3)] |= (leafblock_t)val << shift;
if (val != 0 && val != 0xff)
continue;
rep = *src++;
if (i + rep > numbytes)
Error("%s: overflow", __func__);
/* Already wrote the first byte, add (rep - 1) copies */
while (--rep) {
i++;
shift = (i << 3) & LEAFMASK;
dst->bits[i >> (LEAFSHIFT - 3)] |= (leafblock_t)val << shift;
}
}
}
static void
CopyLeafBits(leafbits_t *dst, const uint8_t *src, int numleafs)
{
int i, shift;
int numbytes;
numbytes = (numleafs + 7) >> 3;
memset(dst->bits, 0, numbytes);
dst->numleafs = numleafs;
for (i = 0; i < numbytes; i++) {
shift = (i << 3) & LEAFMASK;
dst->bits[i >> (LEAFSHIFT - 3)] |= (leafblock_t)(*src++) << shift;
}
}
void
SaveVisState(void)
{
int i, vis_len, might_len;
const portal_t *p;
dvisstate_t state;
dportal_t pstate;
uint8_t *vis;
uint8_t *might;
FILE *outfile;
int err;
outfile = SafeOpenWrite(statetmpfile);
/* Write out a header */
state.version = LittleLong(VIS_STATE_VERSION);
state.numportals = LittleLong(numportals);
state.numleafs = LittleLong(portalleafs);
state.testlevel = LittleLong(testlevel);
state.time_elapsed = LittleLong((uint32_t)(statetime - starttime));
SafeWrite(outfile, &state, sizeof(state));
/* Allocate memory for compressed bitstrings */
might = static_cast<uint8_t *>(malloc((portalleafs + 7) >> 3));
vis = static_cast<uint8_t *>(malloc((portalleafs + 7) >> 3));
for (i = 0, p = portals; i < numportals * 2; i++, p++ ) {
might_len = CompressBits(might, p->mightsee);
if (p->status == pstat_done)
vis_len = CompressBits(vis, p->visbits);
else
vis_len = 0;
pstate.status = LittleLong(p->status);
pstate.might = LittleLong(might_len);
pstate.vis = LittleLong(vis_len);
pstate.nummightsee = LittleLong(p->nummightsee);
pstate.numcansee = LittleLong(p->numcansee);
SafeWrite(outfile, &pstate, sizeof(pstate));
SafeWrite(outfile, might, might_len);
if (vis_len)
SafeWrite(outfile, vis, vis_len);
}
free(might);
free(vis);
err = fclose(outfile);
if (err)
Error("%s: error writing new state (%s)", __func__, strerror(errno));
err = unlink(statefile);
if (err && errno != ENOENT)
Error("%s: error removing old state (%s)", __func__, strerror(errno));
err = rename(statetmpfile, statefile);
if (err)
Error("%s: error renaming state file (%s)", __func__, strerror(errno));
}
qboolean
LoadVisState(void)
{
FILE *infile;
int prt_time, state_time;
int i, numbytes, err;
portal_t *p;
dvisstate_t state;
dportal_t pstate;
uint8_t *compressed;
if (nostate) {
return false;
}
state_time = FileTime(statefile);
if (state_time == -1) {
/* No state file, maybe temp file is there? */
state_time = FileTime(statetmpfile);
if (state_time == -1)
return false;
err = rename(statetmpfile, statefile);
if (err)
return false;
}
prt_time = FileTime(portalfile);
if (prt_time > state_time) {
logprint("State file is out of date, will be overwritten\n");
return false;
}
infile = SafeOpenRead(statefile);
SafeRead(infile, &state, sizeof(state));
state.version = LittleLong(state.version);
state.numportals = LittleLong(state.numportals);
state.numleafs = LittleLong(state.numleafs);
state.testlevel = LittleLong(state.testlevel);
state.time_elapsed = LittleLong(state.time_elapsed);
/* Sanity check the headers */
if (state.version != VIS_STATE_VERSION) {
fclose(infile);
Error("%s: state file version does not match", __func__);
}
if (state.numportals != numportals || state.numleafs != portalleafs) {
fclose(infile);
Error("%s: state file %s does not match portal file %s", __func__,
statefile, portalfile);
}
/* Move back the start time to simulate already elapsed time */
starttime -= state.time_elapsed;
numbytes = (portalleafs + 7) >> 3;
compressed = static_cast<uint8_t *>(malloc(numbytes));
/* Update the portal information */
for (i = 0, p = portals; i < numportals * 2; i++, p++) {
SafeRead(infile, &pstate, sizeof(pstate));
pstate.status = LittleLong(pstate.status);
pstate.might = LittleLong(pstate.might);
pstate.vis = LittleLong(pstate.vis);
pstate.nummightsee = LittleLong(pstate.nummightsee);
pstate.numcansee = LittleLong(pstate.numcansee);
p->status = static_cast<pstatus_t>(pstate.status);
p->nummightsee = pstate.nummightsee;
p->numcansee = pstate.numcansee;
SafeRead(infile, compressed, pstate.might);
p->mightsee = static_cast<leafbits_t *>(malloc(LeafbitsSize(portalleafs)));
memset(p->mightsee, 0, LeafbitsSize(portalleafs));
if (pstate.might < numbytes)
DecompressBits(p->mightsee, compressed);
else
CopyLeafBits(p->mightsee, compressed, portalleafs);
p->visbits = static_cast<leafbits_t *>(malloc(LeafbitsSize(portalleafs)));
memset(p->visbits, 0, LeafbitsSize(portalleafs));
if (pstate.vis) {
SafeRead(infile, compressed, pstate.vis);
if (pstate.vis < numbytes)
DecompressBits(p->visbits, compressed);
else
CopyLeafBits(p->visbits, compressed, portalleafs);
}
/* Portals that were in progress need to be started again */
if (p->status == pstat_working)
p->status = pstat_none;
}
free(compressed);
fclose(infile);
return true;
}
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