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id_ca.c
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id_ca.c
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/* Keen Dreams (SDL2/Steam Port) Source Code
* Copyright (C) 2014 Javier M. Chavez
* Copyright (C) 2015 David Gow <david@davidgow.net>
*
* 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
// ID_CA.C
/*
=============================================================================
Id Software Caching Manager
---------------------------
Must be started BEFORE the memory manager, because it needs to get the headers
loaded into the data segment
=============================================================================
*/
#include "id_heads.h"
#pragma hdrstop
#ifndef _MSC_VER
#include <unistd.h>
#else
#include <io.h>
#endif
/*
=============================================================================
LOCAL CONSTANTS
=============================================================================
*/
typedef struct
{
uint16_t bit0,bit1; // 0-255 is a character, > is a pointer to a node
} huffnode;
PACKED(mapfiletype)
{
uint16_t RLEWtag;
uint32_t headeroffsets[100];
byte headersize[100]; // headers are very small
byte tileinfo[];
} mapfiletype;
/*
=============================================================================
GLOBAL VARIABLES
=============================================================================
*/
byte *tinf;
int mapon;
uint16_t *mapsegs[3];
maptype *mapheaderseg[NUMMAPS];
byte *audiosegs[NUMSNDCHUNKS];
void *grsegs[NUMCHUNKS] = {0};
byte grneeded[NUMCHUNKS];
byte ca_levelbit,ca_levelnum;
char *titleptr[8];
int profilehandle;
/*
=============================================================================
LOCAL VARIABLES
=============================================================================
*/
extern int32_t CGAhead;
extern int32_t EGAhead;
extern byte CGAdict;
extern byte EGAdict;
extern byte maphead;
extern byte mapdict;
extern byte audiohead;
extern byte audiodict;
int32_t *grstarts; // array of offsets in egagraph, -1 for sparse
int32_t *audiostarts; // array of offsets in audio / audiot
#ifdef GRHEADERLINKED
huffnode *grhuffman;
#else
huffnode grhuffman[255];
#endif
#ifdef MAPHEADERLINKED
huffnode *maphuffman;
#else
huffnode maphuffman[255];
#endif
#ifdef AUDIOHEADERLINKED
huffnode *audiohuffman;
#else
huffnode audiohuffman[255];
#endif
int grhandle; // handle to EGAGRAPH
int maphandle; // handle to MAPTEMP / GAMEMAPS
int audiohandle; // handle to AUDIOT / AUDIO
uint32_t chunkcomplen,chunkexplen;
SDMode oldsoundmode;
/*
=============================================================================
LOW LEVEL ROUTINES
=============================================================================
*/
/*
============================
=
= CAL_filelength
=
= Gets the length of the file with handle 'fd'
=
============================
*/
off_t CAL_filelength(int fd)
{
struct stat filestats;
fstat(fd, &filestats);
return filestats.st_size;
}
/*
============================
=
= CAL_GetGrChunkLength
=
= Gets the length of an explicit length chunk (not tiles)
= The file pointer is positioned so the compressed data can be read in next.
=
============================
*/
void CAL_GetGrChunkLength (int chunk)
{
lseek(grhandle,grstarts[chunk],SEEK_SET);
read(grhandle,&chunkexplen,sizeof(chunkexplen));
chunkcomplen = grstarts[chunk+1]-grstarts[chunk]-4;
}
/*
==========================
=
= CA_FarRead
=
= Read from a file to a pointer
=
==========================
*/
boolean CA_FarRead (int handle, byte *dest, long length)
{
return (read(handle, dest, length) == length);
}
/*
==========================
=
= CA_SegWrite
=
= Write from a file to a pointer
=
==========================
*/
boolean CA_FarWrite (int handle, byte *source, long length)
{
return (write(handle, source, length) == length);
}
/*
==========================
=
= CA_LoadFile
=
= Allocate space for and load a file
=
==========================
*/
boolean CA_LoadFile(char *filename, memptr *ptr)
{
// Copied this from Omnispeak.
FILE *f = fopen(filename, "rb");
//Get length of file
fseek(f,0,SEEK_END);
int length = ftell(f);
fseek(f,0,SEEK_SET);
MM_GetPtr(ptr,length);
int amountRead = fread(*ptr,1, length,f);
fclose(f);
if (amountRead != length)
return false;
return true;
}
/*
============================================================================
COMPRESSION routines, see JHUFF.C for more
============================================================================
*/
/*
===============
=
= CAL_OptimizeNodes
=
= Goes through a huffman table and changes the 256-511 node numbers to the
= actular address of the node. Must be called before CAL_HuffExpand
=
= Defanged in Omnispeak-based builds for modern systems.
=
===============
*/
void CAL_OptimizeNodes(huffnode *table)
{
//STUB: This optimization is not very helpful on modern machines.
}
/*
======================
=
= CAL_HuffExpand
=
= Length is the length of the EXPANDED data
=
======================
*/
void CAL_HuffExpand(byte *src, byte *dest, int expLength, huffnode *table)
{
int headptr = 254;
byte *srcptr = (byte*)src;
byte *dstptr = (byte*)dest;
int src_bit = 1; //ch in asm src
byte src_char = *(srcptr++);
int len = 0;
int complen = 1;
while (len < expLength)
{
if (src_char & src_bit)
{
// We've got a '1' bit.
headptr = table[headptr].bit1;
}
else
{
// We've got a '0' bit.
headptr = table[headptr].bit0;
}
if (headptr > 255) headptr -= 256;
else {
*(dstptr++) = (byte)(headptr & 0xff);
headptr = 254;
len++;
if (len == expLength) break;
}
src_bit <<= 1;
if (src_bit == 256) {
src_char = *(srcptr++);
src_bit = 1;
complen++;
}
}
}
/*
======================
=
= CA_RLEWcompress
=
======================
*/
long CA_RLEWCompress (word *src, int expLength, word *dest, word rletag)
{
int compLength = 0;
uint16_t *srcptr = (uint16_t*)src;
uint16_t *dstptr = (uint16_t*)dest-1;
uint16_t count = 0;
while (expLength)
{
uint16_t val = *srcptr++;
expLength -= 2;
count = 1;
while (*srcptr == val && expLength)
{
count++;
expLength -= 2;
srcptr++;
}
if (count > 3 || val == rletag)
{
*dstptr++ = rletag;
*dstptr++ = count;
*dstptr++ = val;
compLength += 6;
}
else
{
compLength += count*2;
while(count--) *dstptr++ = val;
}
}
return compLength;
}
/*
======================
=
= CA_RLEWexpand
= length is COMPRESSED length
=
======================
*/
void CA_RLEWexpand (word *src, word *dest, int expLength, word rletag)
{
uint16_t *srcptr = (uint16_t*)src;
uint16_t *dstptr = (uint16_t*)dest;
uint16_t count, value;
int i;
while (expLength > 0)
{
value = *(srcptr++);
if (value != rletag)
{
*(dstptr++) = value;
expLength -= 2;
}
else
{
count = *(srcptr++);
value = *(srcptr++);
expLength -= count*2;
if(expLength < 0) return; //count += expLength;
for(i = 0; i < count; ++i) { *(dstptr++) = value; }
}
}
}
/*
=============================================================================
CACHE MANAGER ROUTINES
=============================================================================
*/
/*
======================
=
= CAL_SetupGrFile
=
======================
*/
void CAL_SetupGrFile (void)
{
int handle;
uint32_t headersize,length;
memptr compseg;
#ifdef GRHEADERLINKED
#if GRMODE == EGAGR
grhuffman = (huffnode *)&EGAdict;
grstarts = (uint32_t *)(&EGAhead);
#endif
#if GRMODE == CGAGR
grhuffman = (huffnode *)&CGAdict;
grstarts = (uint32_t *)(&CGAhead);
#endif
CAL_OptimizeNodes (grhuffman);
#else
//
// load ???dict.ext (huffman dictionary for graphics files)
//
if ((handle = open(GREXT"DICT."EXTENSION,
// if ((handle = open("KDREAMS.EGA",
O_RDONLY | O_BINARY)) == -1)
Quit ("Can't open KDREAMS.EGA!");
read(handle, &grhuffman, sizeof(grhuffman));
close(handle);
CAL_OptimizeNodes (grhuffman);
//
// load the data offsets from ???head.ext
//
MM_GetPtr ((memptr)&grstarts,(NUMCHUNKS+1)*4);
if ((handle = open(GREXT"HEAD."EXTENSION,
O_RDONLY | O_BINARY)) == -1)
Quit ("Can't open "GREXT"HEAD."EXTENSION"!");
CA_FarRead(handle, (memptr)grstarts, (NUMCHUNKS+1)*4);
close(handle);
#endif
//
// Open the graphics file, leaving it open until the game is finished
//
// grhandle = open(GREXT"GRAPH."EXTENSION, O_RDONLY | O_BINARY); NOLAN
grhandle = open("KDREAMS.EGA", O_RDONLY | O_BINARY);
if (grhandle == -1)
Quit ("Cannot open KDREAMS.EGA!");
//
// load the pic and sprite headers into the arrays in the data segment
//
#if NUMPICS>0
MM_GetPtr((memptr)&pictable,NUMPICS*sizeof(pictabletype));
CAL_GetGrChunkLength(STRUCTPIC); // position file pointer
MM_GetPtr(&compseg,chunkcomplen);
CA_FarRead (grhandle,compseg,chunkcomplen);
CAL_HuffExpand (compseg, (byte *)pictable,NUMPICS*sizeof(pictabletype),grhuffman);
MM_FreePtr(&compseg);
#endif
#if NUMPICM>0
MM_GetPtr((memptr)&picmtable,NUMPICM*sizeof(pictabletype));
CAL_GetGrChunkLength(STRUCTPICM); // position file pointer
MM_GetPtr(&compseg,chunkcomplen);
CA_FarRead (grhandle,compseg,chunkcomplen);
CAL_HuffExpand (compseg, (byte *)picmtable,NUMPICM*sizeof(pictabletype),grhuffman);
MM_FreePtr(&compseg);
#endif
#if NUMSPRITES>0
MM_GetPtr((memptr)&spritetable,NUMSPRITES*sizeof(spritetabletype));
CAL_GetGrChunkLength(STRUCTSPRITE); // position file pointer
MM_GetPtr(&compseg,chunkcomplen);
CA_FarRead (grhandle,compseg,chunkcomplen);
CAL_HuffExpand (compseg, (byte *)spritetable,NUMSPRITES*sizeof(spritetabletype),grhuffman);
MM_FreePtr(&compseg);
#endif
}
//==========================================================================
void CAL_SetupGrFileCGA (void)
{
int handle;
uint32_t headersize,length;
memptr compseg;
#ifdef GRHEADERLINKED
grhuffman = (huffnode *)&CGAdict;
grstarts = (uint32_t *)(&CGAhead);
CAL_OptimizeNodes (grhuffman);
#else
//
// load ???dict.ext (huffman dictionary for graphics files)
//
if ((handle = open(GREXT"DICT.CGA",
// if ((handle = open("KDREAMS.EGA",
O_RDONLY | O_BINARY)) == -1)
Quit ("Can't open EGADICT.CGA!");
read(handle, &grhuffman, sizeof(grhuffman));
close(handle);
CAL_OptimizeNodes (grhuffman);
//
// load the data offsets from ???head.ext
//
MM_GetPtr ((memptr)&grstarts,(NUMCHUNKS+1)*4);
if ((handle = open(GREXT"HEAD.CGA",
O_RDONLY | O_BINARY)) == -1)
Quit ("Can't open "GREXT"HEAD.CGA!");
CA_FarRead(handle, (memptr)grstarts, (NUMCHUNKS+1)*4);
close(handle);
#endif
//
// Open the graphics file, leaving it open until the game is finished
//
// grhandle = open(GREXT"GRAPH."EXTENSION, O_RDONLY | O_BINARY); NOLAN
grhandle = open("KDREAMS.CGA", O_RDONLY | O_BINARY);
if (grhandle == -1)
Quit ("Cannot open KDREAMS.CGA!");
//
// load the pic and sprite headers into the arrays in the data segment
//
#if NUMPICS>0
MM_GetPtr((memptr)&pictable,NUMPICS*sizeof(pictabletype));
CAL_GetGrChunkLength(STRUCTPIC); // position file pointer
MM_GetPtr(&compseg,chunkcomplen);
CA_FarRead (grhandle,compseg,chunkcomplen);
CAL_HuffExpand (compseg, (byte *)pictable,NUMPICS*sizeof(pictabletype),grhuffman);
MM_FreePtr(&compseg);
#endif
#if NUMPICM>0
MM_GetPtr((memptr)&picmtable,NUMPICM*sizeof(pictabletype));
CAL_GetGrChunkLength(STRUCTPICM); // position file pointer
MM_GetPtr(&compseg,chunkcomplen);
CA_FarRead (grhandle,compseg,chunkcomplen);
CAL_HuffExpand (compseg, (byte *)picmtable,NUMPICM*sizeof(pictabletype),grhuffman);
MM_FreePtr(&compseg);
#endif
#if NUMSPRITES>0
MM_GetPtr((memptr)&spritetable,NUMSPRITES*sizeof(spritetabletype));
CAL_GetGrChunkLength(STRUCTSPRITE); // position file pointer
MM_GetPtr(&compseg,chunkcomplen);
CA_FarRead (grhandle,compseg,chunkcomplen);
CAL_HuffExpand (compseg, (byte *)spritetable,NUMSPRITES*sizeof(spritetabletype),grhuffman);
MM_FreePtr(&compseg);
#endif
}
/*
======================
=
= CAL_SetupMapFile
=
======================
*/
void CAL_SetupMapFile (void)
{
int handle,i;
uint32_t length;
byte *buffer;
//
// load maphead.ext (offsets and tileinfo for map file)
//
#ifndef MAPHEADERLINKED
if ((handle = open("MAPHEAD."EXTENSION,
// if ((handle = open("KDREAMS.MAP",
O_RDONLY | O_BINARY)) == -1)
Quit ("Can't open KDREAMS.MAP!");
length = CAL_filelength(handle);
MM_GetPtr ((memptr)&tinf,length);
CA_FarRead(handle, tinf, length);
close(handle);
#ifdef MAPSCOMPRESSED
//
// load mapdict.ext (huffman tree)
//
if ((handle = open("MAPDICT."EXTENSION, O_RDONLY | O_BINARY)) == -1)
Quit ("Can't open MAPDICT."EXTENSION"!");
length = CAL_filelength(handle);
//assert(length == 1020);
CA_FarRead(handle, maphuffman, 255*sizeof(huffnode));
close(handle);
#endif
#else
maphuffman = (huffnode *)&mapdict;
CAL_OptimizeNodes (maphuffman);
tinf = (byte *)(&maphead);
#endif
//
// open the data file
//
#if defined(MAPHEADERLINKED) || defined(MAPSCOMPRESSED)
if ((maphandle = open("KDREAMS.MAP",
O_RDONLY)) == -1)
Quit ("Can't open KDREAMS.MAP!");
#else
if ((maphandle = open("MAPTEMP."EXTENSION,
O_RDONLY)) == -1)
Quit ("Can't open MAPTEMP."EXTENSION"!");
#endif
}
//==========================================================================
/*
======================
=
= CAL_SetupAudioFile
=
======================
*/
void CAL_SetupAudioFile (void)
{
int handle,i;
uint32_t length;
byte *buffer;
//
// load maphead.ext (offsets and tileinfo for map file)
//
#ifndef AUDIOHEADERLINKED
#ifdef AUDIOCOMPRESSED
if ((handle = open("SOUNDHHD."EXTENSION,
O_RDONLY)) == -1)
Quit ("Can't open SOUNDHHD."EXTENSION"!");
#else
if ((handle = open("SOUNDHED."EXTENSION,
O_RDONLY)) == -1)
Quit ("Can't open SOUNDHED."EXTENSION"!");
#endif
length = CAL_filelength(handle);
MM_GetPtr ((memptr)&audiostarts,length);
CA_FarRead(handle, (byte *)audiostarts, length);
close(handle);
#ifdef AUDIOCOMPRESSED
//
// load audiodct.ext (huffman tree)
//
if ((handle = open("SOUNDDCT."EXTENSION, O_RDONLY | O_BINARY)) == -1)
Quit ("Can't open SOUNDDCT."EXTENSION"!");
length = CAL_filelength(handle);
//assert(length >= 1020);
CA_FarRead(handle, audiohuffman, sizeof(audiohuffman));
close(handle);
#endif
#else
audiohuffman = (huffnode *)&audiodict;
CAL_OptimizeNodes (audiohuffman);
audiostarts = (uint32_t *)(&audiohead);
#endif
//
// open the data file
//
#if !defined(AUDIOHEADERLINKED) && !defined(AUDIOCOMPRESSED)
if ((audiohandle = open("SOUNDT."EXTENSION,
O_RDONLY | O_BINARY)) == -1)
Quit ("Can't open SOUNDT."EXTENSION"!");
#else
// if ((audiohandle = open("AUDIO."EXTENSION, NOLAN
if ((audiohandle = open("KDREAMS.SND",
O_RDONLY | O_BINARY)) == -1)
Quit ("Can't open KDREAMS.SND!");
#endif
}
//==========================================================================
/*
======================
=
= CA_Startup
=
= Open all files and load in headers
=
======================
*/
void CA_Startup (void)
{
#ifdef PROFILE
unlink ("PROFILE.TXT");
profilehandle = open("PROFILE.TXT", O_CREAT, S_IRUSR | S_IWUSR);
#endif
CAL_SetupMapFile ();
if (fakecga)
CAL_SetupGrFileCGA();
else
CAL_SetupGrFile ();
CAL_SetupAudioFile ();
mapon = -1;
ca_levelbit = 1;
ca_levelnum = 0;
}
//==========================================================================
/*
======================
=
= CA_Shutdown
=
= Closes all files
=
======================
*/
void CA_Shutdown (void)
{
#ifdef PROFILE
close (profilehandle);
#endif
close (maphandle);
close (grhandle);
}
//===========================================================================
/*
======================
=
= CA_CacheAudioChunk
=
======================
*/
void CA_CacheAudioChunk (int chunk)
{
uint32_t pos,compressed,expanded;
memptr bigbufferseg;
byte *source;
if (audiosegs[chunk])
{
MM_SetPurge ((memptr)&audiosegs[chunk],0);
return; // allready in memory
}
//
// load the chunk into a buffer, either the miscbuffer if it fits, or allocate
// a larger buffer
//
pos = audiostarts[chunk];
compressed = audiostarts[chunk+1]-pos;
lseek(audiohandle,pos,SEEK_SET);
#if !defined(AUDIOHEADERLINKED) && !defined(AUDIOCOMPRESSED)
MM_GetPtr ((memptr)&audiosegs[chunk],compressed);
CA_FarRead(audiohandle,audiosegs[chunk],compressed);
#else
if (compressed<=BUFFERSIZE)
{
CA_FarRead(audiohandle,bufferseg,compressed);
source = bufferseg;
}
else
{
MM_GetPtr(&bigbufferseg,compressed);
CA_FarRead(audiohandle,bigbufferseg,compressed);
source = bigbufferseg;
}
expanded = *(uint32_t *)source;
source += 4; // skip over length
MM_GetPtr ((memptr)&audiosegs[chunk],expanded);
CAL_HuffExpand (source,audiosegs[chunk],expanded,audiohuffman);
if (compressed>BUFFERSIZE)
MM_FreePtr(&bigbufferseg);
#endif
}
//===========================================================================
/*
======================
=
= CA_LoadAllSounds
=
= Purges all sounds, then loads all new ones (mode switch)
=
======================
*/
void CA_LoadAllSounds (void)
{
unsigned start,i;
switch (oldsoundmode)
{
case sdm_Off:
goto cachein;
case sdm_PC:
start = STARTPCSOUNDS;
break;
case sdm_AdLib:
start = STARTADLIBSOUNDS;
break;
case sdm_SoundBlaster:
case sdm_SoundSource:
start = STARTDIGISOUNDS;
break;
}
for (i=0;i<NUMSOUNDS;i++,start++)
if (audiosegs[start])
MM_SetPurge ((memptr)&audiosegs[start],3); // make purgable
cachein:
switch (SoundMode)
{
case sdm_Off:
return;
case sdm_PC:
start = STARTPCSOUNDS;
break;
case sdm_AdLib:
start = STARTADLIBSOUNDS;
break;
case sdm_SoundBlaster:
case sdm_SoundSource:
start = STARTDIGISOUNDS;
break;
}
for (i=0;i<NUMSOUNDS;i++,start++)
CA_CacheAudioChunk (start);
oldsoundmode = SoundMode;
}
//===========================================================================
/*
======================
=
= CAL_CacheSprite
=
= Generate shifts and set up sprite structure for a given sprite
=
======================
*/
void CAL_CacheSprite (int chunk, byte *compressed)
{
int i;
uint16_t shiftstarts[5];
uint16_t smallplane,bigplane,expanded;
spritetabletype *spr;
#if GRMODE == CGAGR
//
// CGA has no pel panning, so shifts are never needed
//
spr = &spritetable[chunk-STARTSPRITES];
smallplane = spr->width*spr->height;
MM_GetPtr (&grsegs[chunk],smallplane*2+MAXSHIFTS*6);
dest = (spritetype *)grsegs[chunk];
dest->sourceoffset[0] = MAXSHIFTS*6; // start data after 3 unsigned tables
dest->planesize[0] = smallplane;
dest->width[0] = spr->width;
//
// expand the unshifted shape
//
CAL_HuffExpand (compressed, &dest->data[0],smallplane*2,grhuffman);
#endif
#if GRMODE == EGAGR
//
// calculate sizes
//
spr = &spritetable[chunk-STARTSPRITES];
expanded = spr->width * spr->height;
memptr temp;
MM_GetPtr (&temp, expanded * 5);
MM_GetPtr (&grsegs[chunk],expanded * 8);
//
// expand the unshifted shape
//
CAL_HuffExpand (compressed, temp, expanded * 5, grhuffman);
//
// convert to PAL8/VGA to cut down on conversion time later
//
VW_MaskedToPAL8(temp, grsegs[chunk], 0, 0, spr->width * 8, spr->width * 8, spr->height);
MM_FreePtr(&temp);
switch (spr->shifts)
{
case 1:
case 2:
case 3:
case 4:
break;
default:
Quit ("CAL_CacheSprite: Bad shifts number!");
}
#endif
}
//===========================================================================
/*
======================
=
= CAL_ExpandGrChunk
=
= Does whatever is needed with a pointer to a compressed chunk
=
======================
*/
void CAL_ExpandGrChunk (int chunk, byte *source)
{
int32_t pos,compressed,expanded;
int next;
spritetabletype *spr;
if (chunk>=STARTTILE8)
{
//
// expanded sizes of tile8/16/32 are implicit
//
#if GRMODE == EGAGR
#define BLOCK 32
#define MASKBLOCK 40
#endif
#if GRMODE == CGAGR
#define BLOCK 16