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HOVMAIN.C
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HOVMAIN.C
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/* Hovertank 3-D Source Code
* Copyright (C) 1993-2014 Flat Rock Software
*
* 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.
*/
#define CATALOG
#include "HOVERDEF.H"
#pragma hdrstop
/*
NOTICE TO ANYONE READING THIS:
This is the last gasp of our old routines! Everything is being rewritten
from scratch to work with new graphic modes and utilities. This code
stinks!
*/
/*
=============================================================================
GLOBALS
=============================================================================
*/
int SNDstarted,KBDstarted; // whether int handlers were started
int grhandle,levelhandle,soundhandle;
typedef struct
{
int headersize;
long dictionary;
long dataoffsets;
} grheadtype;
grheadtype *grhead; // sets grhuffman and grstarts from here
huffnode *grhuffman; // huffman dictionary for egagraph
long *grstarts; // array of offsets in egagraph, -1 for sparse
int grhandle; // handle to egagraph, kept open allways
long grposition; // current seek position in file
long chunkcomplen; // compressed length of a chunk
int soundblaster; // present?
int levelhandle,soundhandle;
#define BUFFERSIZE 1024
memptr bufferseg; // small general purpose memory block
memptr levelseg;
int tedlevel,ingame,resetgame;
memptr scalesegs[NUMPICS];
/*
=============================================================================
*/
/*
=============
=
= DoHelpText
=
=============
*/
void DoHelpText(void)
{
CenterWindow (38,14);
fontcolor = 13;
CPPrint ("HoverTank Commands\n");
fontcolor = 15;
py+=6;
PPrint (
"F2 : Sound on / off\n"
"F3 : Keyboard mode / custom\n"
"F4 : Joystick mode\n"
"F5 : Reset game\n"
"ESC : Quit\n");
py+=6;
PPrint (
"UP / DOWN : forward/reverse\n"
"LEFT / RIGHT : turn\n");
py+=6;
CPPrint ("<MORE>");
Ack();
EraseWindow ();
CPPrint ("Button 1 / Ctrl\n");
CPPrint ("---------------\n\n");
PPrint (
/*.....................................*/
"Charge cannon. A fully charged cannon\n"
"can shoot through multiple targets.\n"
"While the cannon is charging, your\n"
"tanks turning speed is halved for fine\n"
"aiming adjustments.\n\n");
CPPrint ("<MORE>");
Ack();
EraseWindow ();
CPPrint ("Button 2 / Alt\n");
CPPrint ("---------------\n\n");
PPrint (
/*.....................................*/
"Afterburner thrusting. Doubles your\n"
"forward or backwards speed, but does\n"
"not effect your turning speed.\n");
Ack();
}
/*
==================
=
= DebugMemory
=
==================
*/
void DebugMemory (void)
{
CenterWindow (16,7);
CPPrint ("Memory Usage\n");
CPPrint ("------------");
PPrint ("\nTotal :");
PPrintUnsigned (totalmem/64);
PPrint ("k\nFree :");
PPrintUnsigned (MMUnusedMemory()/64);
PPrint ("k\nWith purge:");
PPrintUnsigned (MMTotalFree()/64);
PPrint ("k\n");
CPPrint ("");
PGet();
}
/*
================
=
= DebugKeys
=
================
*/
void DebugKeys (void)
{
int i;
if (keydown[0x22]) // G = god mode
{
ExpWin (12,1);
if (godmode)
CPPrint ("God mode off");
else
CPPrint ("God mode on");
Ack();
godmode ^= 1;
}
else if (keydown[0x32]) // M = memory info
{
DebugMemory();
}
if (keydown[0x19]) // P = pause with no screen disruptioon
{
singlestep=1;
}
if (keydown[0x1f]) // S = shield point
{
screenofs = 0;
HealPlayer();
}
else if (keydown[0x14]) // T = free time
{
if (timestruct.min<9)
timestruct.min++;
screenofs = 0;
DrawPic (6,48,DIGIT0PIC+timestruct.min);
}
else if (keydown[0x11]) // W = warp to level
{
ExpWin(26,1);
PPrint("Warp to which level(1-20):");
i = InputInt();
if (i>=1 && i<=21)
{
level = i-1;
leveldone=1;
}
}
}
/*=========================================================================*/
/*
=============
=
= CheckKeys
=
= Checks to see if an F-key is being pressed and handles it
=
=============
*/
int CheckKeys(void)
{
if (!NBKscan)
return 0;
switch (NBKscan&0x7f)
{
case 0x3b: // F1 = help
ClearKeys ();
DoHelpText ();
break;
case 0x3c: // F2 = sound on/off
ClearKeys ();
ExpWin (13,1);
PPrint ("Sound (Y/N)?");
ch=toupper(PGet());
if (ch=='N')
soundmode = false;
else if (ch=='Y')
soundmode = true;
break;
case 0x3d: // F3 = keyboard mode
ClearKeys ();
calibratekeys ();
break;
case 0x3e: // F4 = joystick mode
ClearKeys ();
CalibrateJoy (1);
break;
case 0x3f: // F5 = reset game
ClearKeys ();
ExpWin (18,1);
PPrint ("RESET GAME (Y/N)?");
ch=toupper(PGet());
if (ch=='Y')
{
resetgame = 1;
leveldone = -99;
}
break;
case 0x58: // F12 + ? = debug keys
DebugKeys();
break;
case 1: // ESC = quit
ClearKeys ();
ExpWin (12,1);
PPrint ("QUIT (Y/N)?");
ch=toupper(PGet());
if (ch=='Y')
Quit ("");
break;
default:
return 0;
}
ClearKeys ();
return 1;
}
//==========================================================================
/*
============================
=
= GetChunkLength
=
= Seeks into the igrab data file at the start of the given chunk and
= reads the uncompressed length (first four bytes). The file pointer is
= positioned so the compressed data can be read in next.
= ChunkCompLen is set to the calculated compressed length
=
============================
*/
long GetChunkLength (int chunk)
{
long len;
lseek(grhandle,grstarts[chunk],SEEK_SET);
read(grhandle,&len,sizeof(len));
chunkcomplen = grstarts[chunk+1]-grstarts[chunk]-4;
return len;
}
//==========================================================================
/*
============================
=
= LoadNearData
=
= Load stuff into data segment before memory manager is
= started (which takes all available memory, near and far)
=
============================
*/
void LoadNearData (void)
{
int handle;
long length;
//
// load egahead.ext (offsets and dictionary for graphics file)
//
if ((handle = open("EGAHEAD."EXTENSION, O_RDONLY | O_BINARY, S_IWRITE | S_IREAD)) == -1)
Quit ("Can't open EGAHEAD."EXTENSION"!");
length = filelength(handle);
grhead = malloc(length);
read(handle, grhead, length);
close(handle);
}
//==========================================================================
/*
==========================
=
= SegRead
=
= Read from a file to a segment pointer
=
==========================
*/
void SegRead (int handle, memptr dest, long length)
{
if (length>0xffffl)
Quit ("SegRead doesn't support 64K reads yet!");
asm push ds
asm mov bx,[handle]
asm mov cx,[WORD PTR length]
asm mov dx,0 // segment aligned
asm mov ds,[dest]
asm mov ah,3fh // READ w/handle
asm int 21h
asm pop ds
}
//==========================================================================
/////////////////////////////////////////////////////////
//
// InitGrFile
//
/////////////////////////////////////////////////////////
void InitGrFile (void)
{
memptr buffer;
//
// calculate some offsets in the header
//
grhuffman = (huffnode *)( ((char *)grhead)+grhead->dictionary);
grstarts = (long *)( ((char *)grhead)+grhead->dataoffsets);
OptimizeNodes (grhuffman);
//
// Open the graphics file, leaving it open until the game is finished
//
grhandle = open("EGAGRAPH."EXTENSION, O_RDONLY | O_BINARY);
if (grhandle == -1)
Quit ("Cannot open EGAGRAPH."EXTENSION"!");
//
// load the pic and sprite headers into the data segment
//
#if NUMPICS>0
needgr[STRUCTPIC] = 1; // make sure this chunk never reloads
grsegs[STRUCTPIC] = (memptr)0xffff;
GetChunkLength(STRUCTPIC); // position file pointer
MMGetPtr(&buffer, chunkcomplen);
SegRead (grhandle,buffer,chunkcomplen);
HuffExpand ((unsigned char huge *)buffer, (unsigned char huge *)pictable,
sizeof(pictable),grhuffman);
MMFreePtr(&buffer);
#endif
#if NUMPICM>0
needgr[STRUCTPICM] = 1; // make sure this chunk never reloads
grsegs[STRUCTPICM] = (memptr)0xffff;
GetChunkLength(STRUCTPICM); // position file pointer
MMGetPtr(&buffer, chunkcomplen);
SegRead (grhandle,buffer,chunkcomplen);
HuffExpand (buffer, (unsigned char huge *)picmtable,
sizeof(picmtable),grhuffman);
MMFreePtr(&buffer);
#endif
#if NUMSPRITES>0
needgr[STRUCTSPRITE] = 1; // make sure this chunk never reloads
grsegs[STRUCTSPRITE] = (memptr)0xffff;
GetChunkLength(STRUCTSPRITE); // position file pointer
MMGetPtr(&buffer, chunkcomplen);
SegRead (grhandle,buffer,chunkcomplen);
HuffExpand (buffer, (unsigned char huge *)spritetable,
sizeof(spritetable),grhuffman);
MMFreePtr(&buffer);
#endif
}
//==========================================================================
/*
==========================
=
= CacheGrFile
=
= Goes through grneeded and grsegs, and makes sure
= everything needed is in memory
=
==========================
*/
// base tile sizes for EGA mode
#define BLOCK 32
#define MASKBLOCK 40
void CacheGrFile (void)
{
int i;
long filepos,newpos; // current seek position in file
long expanded,compressed; // chunk lengths
memptr bigbufferseg; // for compressed
//
// make unneeded chunks purgable
//
for (i=0;i<NUMCHUNKS;i++)
if (grsegs[i] && !needgr[i])
MMSetPurge(&grsegs[i],3);
MMSortMem();
//
// load new stuff
//
lseek(grhandle,0,SEEK_SET);
filepos = 0;
for (i=0;i<NUMCHUNKS;i++)
if (!grsegs[i] && needgr[i])
{
newpos = grstarts[i];
if (newpos!=filepos)
lseek(grhandle,newpos-filepos,SEEK_CUR);
compressed = grstarts[i+1]-grstarts[i]-4;
if (i>=STARTTILE8)
{
//
// tiles are of a known size
//
if (i<STARTTILE8M) // tile 8s are all in one chunk!
expanded = BLOCK*NUMTILE8;
else if (i<STARTTILE16)
expanded = MASKBLOCK*NUMTILE8M;
else if (i<STARTTILE16M) // all other tiles are one/chunk
expanded = BLOCK*4;
else if (i<STARTTILE32)
expanded = MASKBLOCK*4;
else if (i<STARTTILE32M)
expanded = BLOCK*16;
else
expanded = MASKBLOCK*16;
compressed = grstarts[i+1]-grstarts[i];
}
else
{
//
// other things have a length header at start of chunk
//
read(grhandle,&expanded,sizeof(expanded));
compressed = grstarts[i+1]-grstarts[i]-4;
}
//
// allocate space for expanded chunk
//
MMGetPtr(&grsegs[i],expanded);
//
// if the entire compressed length can't fit in the general purpose
// buffer, allocate a temporary memory block for it
//
if (compressed<=BUFFERSIZE)
{
SegRead(grhandle,bufferseg,compressed);
HuffExpand (bufferseg, grsegs[i], expanded,grhuffman);
}
else
{
MMGetPtr(&bigbufferseg,compressed);
SegRead(grhandle,bigbufferseg,compressed);
HuffExpand (bigbufferseg, grsegs[i], expanded,grhuffman);
MMFreePtr(&bigbufferseg);
}
filepos = grstarts[i+1]; // file pointer is now at start of next one
}
}
//==========================================================================
/*
=====================
=
= CachePic
=
= Make sure a graphic chunk is in memory
=
=====================
*/
void CachePic (int picnum)
{
long expanded,compressed; // chunk lengths
memptr bigbufferseg; // for compressed
if (grsegs[picnum])
return;
lseek(grhandle,grstarts[picnum],SEEK_SET);
compressed = grstarts[picnum+1]-grstarts[picnum]-4;
if (picnum>=STARTTILE8)
{
//
// tiles are of a known size
//
if (picnum<STARTTILE8M) // tile 8s are all in one chunk!
expanded = BLOCK*NUMTILE8;
else if (picnum<STARTTILE16)
expanded = MASKBLOCK*NUMTILE8M;
else if (picnum<STARTTILE16M) // all other tiles are one/chunk
expanded = BLOCK*4;
else if (picnum<STARTTILE32)
expanded = MASKBLOCK*4;
else if (picnum<STARTTILE32M)
expanded = BLOCK*16;
else
expanded = MASKBLOCK*16;
compressed = grstarts[picnum+1]-grstarts[picnum];
}
else
{
//
// other things have a length header at start of chunk
//
read(grhandle,&expanded,sizeof(expanded));
compressed = grstarts[picnum+1]-grstarts[picnum]-4;
}
//
// allocate space for expanded chunk
//
MMGetPtr(&grsegs[picnum],expanded);
MMGetPtr(&bigbufferseg,compressed);
SegRead(grhandle,bigbufferseg,compressed);
HuffExpand (bigbufferseg, grsegs[picnum], expanded,grhuffman);
MMFreePtr(&bigbufferseg);
}
//==========================================================================
void PatchPointers (void)
{
fontseg = grsegs[STARTFONT];
}
//==========================================================================
/*
=====================
==
== Quit
==
=====================
*/
void Quit (char *error)
{
//char extern far PIRACY;
if (!(*error))
{
SaveCtrls ();
}
MMShutdown();
if (KBDstarted)
ShutdownKbd (); // shut down the interrupt driven stuff if needed
if (SNDstarted)
ShutdownSound ();
if (soundblaster)
jmShutSB ();
if (grhandle>0)
close(grhandle);
if (levelhandle>0)
close(levelhandle);
if (soundhandle>0)
close(soundhandle);
_AX = 3;
geninterrupt (0x10); // text mode
if (!(*error))
{
#if 0
movedata (FP_SEG(&PIRACY),FP_OFF(&PIRACY),0xb800,0,4000);
bioskey (0);
clrscr();
#endif
#ifndef CATALOG
_argc = 2;
_argv[1] = "LAST.SHL";
_argv[2] = "ENDSCN.SCN";
_argv[3] = NULL;
if (execv("LOADSCN.EXE", _argv) == -1)
{
clrscr();
puts("Couldn't find executable LOADSCN.EXE.\n");
exit(1);
}
#endif
}
else
puts (error);
exit (0); // quit to DOS
}
//==========================================================================
/*
======================
=
= LoadLevel
=
= Loads LEVEL00.EXT (00 = global variable level)
=
======================
*/
void LoadLevel(void)
{
unsigned far *planeptr;
int loop,x,y,i,j;
unsigned length;
char filename[30];
char num[3];
memptr bufferseg;
//
// load the new level in and decompress
//
if (level<10)
{
itoa (level,num,10);
strcpy (filename,"LEVEL0");
}
else
{
itoa (level,num,10);
strcpy (filename,"LEVEL");
}
strcat (filename,num);
strcat (filename,"."EXTENSION);
BloadinMM(filename,&bufferseg);
length = *(unsigned _seg *)bufferseg;
if (levelseg)
MMFreePtr (&levelseg);
MMGetPtr (&levelseg,length);
RLEWExpand ((unsigned far *)bufferseg,(unsigned far *)levelseg);
MMFreePtr (&bufferseg);
levelheader = (LevelDef far *)levelseg;
//
// copy plane 0 to tilemap
//
planeptr= (unsigned far *)((char _seg *)levelseg+32);
for (y=0;y<levelheader->height;y++)
for (x=0;x<levelheader->width;x++)
tilemap[x][y]=*planeptr++;
//
// spawn tanks
//
planeptr= (unsigned far *)((char _seg *)levelseg+32+levelheader->planesize);
StartLevel (planeptr);
MMFreePtr (&levelseg);
}
//==========================================================================
/*
=================
=
= CacheDrawPic
=
=================
*/
void CacheDrawPic(int picnum)
{
int i;
CachePic (STARTPICS+picnum);
EGASplitScreen(200);
SetScreen(0,0);
SetLineWidth(80);
screenofs = 0;
EGAWRITEMODE(0);
DrawPic (0,0,picnum);
EGAWRITEMODE(1);
EGAMAPMASK(15);
CopyEGA(80,200,0,0x4000);
EGAWRITEMODE(0);
MMSetPurge (&grsegs[STARTPICS+picnum],3);
}
//==========================================================================
int SoundPlaying (void)
{
if (soundblaster)
return jmSamplePlaying();
else
return sndptr;
}
#if 0
/*
=====================
=
= PlaySound
=
= Dispatches to either pc speaker sound routines or sound blaster
= digitized routines
=
=====================
*/
void PlaySound (int num)
{
if (soundblaster)
jmPlaySample(num);
else
PlaySoundSPK(num);
}
#endif
//==========================================================================
/*
=====================
=
= Intro
=
=====================
*/
void Intro (void)
{
memptr shapeseg;
int i,f,sx,sy,page;
unsigned pageptr[2],pagewidth[2],pageheight[2];
float x,y,z,angle,step,sn,cs,maxz,sizescale,maxy,coordscale,scale;
float ytop,xmid,minz,worldycenter,worldxcenter;
FadeOut();
SetLineWidth(SCREENWIDTH);
screenofs=0;
CacheDrawPic (STARSPIC);
pxl=0;
pxh=320;
py=180;
#ifndef CATALOG
CPPrint ("Copyright (c) 1991-93 Softdisk Publishing\n");
// CPPrint ("'I' for information");
#endif
EGAWRITEMODE(1);
EGAMAPMASK(15);
CopyEGA(40,200,0,0x4000);
CopyEGA(40,200,0,0x8000);
CopyEGA(40,200,0,0xc000);
StopDrive();
CachePic (STARTPICS+LOGOPIC);
SC_MakeShape(
grsegs[STARTPICS+LOGOPIC],
0,
0,
&shapeseg);
// SC_MakeShape(
// grsegs[STARTPICS+LOGOPIC],
// pictable[LOGOPIC].width,
// pictable[LOGOPIC].height,
// &shapeseg);
MMFreePtr(&grsegs[STARTPICS+LOGOPIC]);
FadeIn();
sx=160;
sy=180;
// memset (zbuffer,0,sizeof(zbuffer));
/*
=============================================================================
SCALED PICTURE DIRECTOR
=============================================================================
*/
#define PICHEIGHT 64 // full size height of scaled pic
#define NUMFRAMES 300.0
#define MAXANGLE (3.141592657*0.6) // go from 0 to this in numframes
#define RADIUS 1000.0 // world coordinates
#define DISTANCE 1000.0 // center point z distance
minz = cos(MAXANGLE)*RADIUS; // closest point
minz += DISTANCE;
sizescale = 256*minz; // closest point will be full size
ytop = 80 - (PICHEIGHT/2)*(sizescale/DISTANCE)/256;
z = sizescale/(DISTANCE*256);
ytop = ytop/z; // world coordinates
worldycenter=ytop-RADIUS;
xmid=sin(MAXANGLE)*RADIUS/2;
worldxcenter=-xmid;
f=1;
page = inttime = screenofs = pagewidth[0] = pagewidth[1] = 0;
do
{
step = f/NUMFRAMES;
angle=MAXANGLE*step;
sn=sin(angle);
cs=cos(angle);
x=worldxcenter+sn*RADIUS/2;
y=worldycenter+sn*RADIUS;
z=DISTANCE+cs*RADIUS;
scale = sizescale/z;
sx=160+ (int)(x*scale/256);
sy=100- (int)(y*scale/256);
inttime=0;
sound((int)(sn*1500));
//
// erase old position
//
if (pagewidth[page])
{
EGAWRITEMODE(1);
EGAMAPMASK(15);
CopyEGA(pagewidth[page],pageheight[page],
pageptr[page]+0x8000,pageptr[page]);
}
//
// draw new position
//
EGAWRITEMODE(2);
if (SC_ScaleShape(sx,sy,(int)scale<40 ? 10 : scale/4,shapeseg))
{
pagewidth[page]=scaleblockwidth;
pageheight[page]=scaleblockheight;
pageptr[page]=scaleblockdest;
}
else
pagewidth[page]=0;
EGAWRITEMODE(0);
EGABITMASK(255);
//
// display it
//
SetScreen(screenofs,0);
page^=1;
screenofs = 0x4000*page;
f++;
if (f<NUMFRAMES)
{
f+=inttime;
if (f>NUMFRAMES)
f=NUMFRAMES;
}
else
f++; // last frame is shown
if (NBKscan>0x7f)
break;
} while (f<=NUMFRAMES);
nosound();
for (i=0;i<200;i++)
{