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I_IBM.C
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I_IBM.C
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// I_IBM.C
#include <dos.h>
#include <conio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <graph.h>
#include "DoomDef.h"
#include "R_local.h"
#include "sounds.h"
#include "i_sound.h"
#include "soundst.h"
#include "dmx.h"
#include "dpmiapi.h"
// Macros
#define DPMI_INT 0x31
//#define NOKBD
//#define NOTIMER
// Public Data
int DisplayTicker = 0;
// Code
void main(int argc, char **argv)
{
myargc = argc;
myargv = argv;
D_DoomMain();
}
void I_StartupNet (void);
void I_StartupSound (void);
void I_ShutdownNet (void);
void I_ShutdownSound (void);
void I_ReadExternDriver (void);
void I_JoystickEvents (void);
void I_SetMusicVolume (int volume);
void DPMIInt (int i);
fixed_t P_AproxDistance (fixed_t dx, fixed_t dy);
typedef struct
{
unsigned edi, esi, ebp, reserved, ebx, edx, ecx, eax;
unsigned short flags, es, ds, fs, gs, ip, cs, sp, ss;
} dpmiregs_t;
extern dpmiregs_t dpmiregs;
void I_ReadMouse (void);
void I_InitDiskFlash (void);
extern int usemouse, usejoystick;
extern void **lumpcache;
/*
===============================================================================
MUSIC & SFX API
===============================================================================
*/
static channel_t channel[MAX_CHANNELS];
static int rs; //the current registered song.
int mus_song = -1;
int mus_lumpnum;
void *mus_sndptr;
byte *soundCurve;
extern sfxinfo_t S_sfx[];
extern musicinfo_t S_music[];
extern int snd_DesiredMusicDevice;
extern int snd_DesiredSfxDevice;
extern int snd_MaxVolume;
extern int snd_MusicVolume;
extern int snd_Channels;
extern int startepisode;
extern int startmap;
int AmbChan;
void S_Start(void)
{
int i;
S_StartSong((gameepisode-1)*9 + gamemap-1, true);
//stop all sounds
for(i=0; i < snd_Channels; i++)
{
if(channel[i].handle)
{
S_StopSound(channel[i].mo);
}
}
memset(channel, 0, 8*sizeof(channel_t));
}
void S_StartSong(int song, boolean loop)
{
if(song == mus_song)
{ // don't replay an old song
return;
}
if(rs)
{
I_StopSong(rs);
I_UnRegisterSong(rs);
Z_ChangeTag(lumpcache[mus_lumpnum], PU_CACHE);
#ifdef __WATCOMC__
_dpmi_unlockregion(mus_sndptr, lumpinfo[mus_lumpnum].size);
#endif
}
if(song < mus_e1m1 || song > NUMMUSIC)
{
return;
}
mus_lumpnum = W_GetNumForName(S_music[song].name);
mus_sndptr = W_CacheLumpNum(mus_lumpnum, PU_MUSIC);
#ifdef __WATCOMC__
_dpmi_lockregion(mus_sndptr, lumpinfo[mus_lumpnum].size);
#endif
rs = I_RegisterSong(mus_sndptr);
I_PlaySong(rs, loop); //'true' denotes endless looping.
mus_song = song;
}
void S_StartSound(mobj_t *origin, int sound_id)
{
int dist, vol;
int i;
int sound;
int priority;
int sep;
int angle;
int absx;
int absy;
static int sndcount = 0;
int chan;
if(sound_id==0 || snd_MaxVolume == 0)
return;
if(origin == NULL)
{
origin = players[consoleplayer].mo;
}
// calculate the distance before other stuff so that we can throw out
// sounds that are beyond the hearing range.
absx = abs(origin->x-players[consoleplayer].mo->x);
absy = abs(origin->y-players[consoleplayer].mo->y);
dist = absx+absy-(absx > absy ? absy>>1 : absx>>1);
dist >>= FRACBITS;
// dist = P_AproxDistance(origin->x-viewx, origin->y-viewy)>>FRACBITS;
if(dist >= MAX_SND_DIST)
{
// dist = MAX_SND_DIST - 1;
return; //sound is beyond the hearing range...
}
if(dist < 0)
{
dist = 0;
}
priority = S_sfx[sound_id].priority;
priority *= (10 - (dist/160));
if(!S_StopSoundID(sound_id, priority))
{
return; // other sounds have greater priority
}
for(i=0; i<snd_Channels; i++)
{
if(origin->player)
{
i = snd_Channels;
break; // let the player have more than one sound.
}
if(origin == channel[i].mo)
{ // only allow other mobjs one sound
S_StopSound(channel[i].mo);
break;
}
}
if(i >= snd_Channels)
{
if(sound_id >= sfx_wind)
{
if(AmbChan != -1 && S_sfx[sound_id].priority <=
S_sfx[channel[AmbChan].sound_id].priority)
{
return; //ambient channel already in use
}
else
{
AmbChan = -1;
}
}
for(i=0; i<snd_Channels; i++)
{
if(channel[i].mo == NULL)
{
break;
}
}
if(i >= snd_Channels)
{
//look for a lower priority sound to replace.
sndcount++;
if(sndcount >= snd_Channels)
{
sndcount = 0;
}
for(chan=0; chan < snd_Channels; chan++)
{
i = (sndcount+chan)%snd_Channels;
if(priority >= channel[i].priority)
{
chan = -1; //denote that sound should be replaced.
break;
}
}
if(chan != -1)
{
return; //no free channels.
}
else //replace the lower priority sound.
{
if(channel[i].handle)
{
if(I_SoundIsPlaying(channel[i].handle))
{
I_StopSound(channel[i].handle);
}
if(S_sfx[channel[i].sound_id].usefulness > 0)
{
S_sfx[channel[i].sound_id].usefulness--;
}
if(AmbChan == i)
{
AmbChan = -1;
}
}
}
}
}
if(S_sfx[sound_id].lumpnum == 0)
{
S_sfx[sound_id].lumpnum = I_GetSfxLumpNum(&S_sfx[sound_id]);
}
if(S_sfx[sound_id].snd_ptr == NULL)
{
S_sfx[sound_id].snd_ptr = W_CacheLumpNum(S_sfx[sound_id].lumpnum,
PU_SOUND);
#ifdef __WATCOMC__
_dpmi_lockregion(S_sfx[sound_id].snd_ptr,
lumpinfo[S_sfx[sound_id].lumpnum].size);
#endif
}
// calculate the volume based upon the distance from the sound origin.
// vol = (snd_MaxVolume*16 + dist*(-snd_MaxVolume*16)/MAX_SND_DIST)>>9;
vol = soundCurve[dist];
if(origin == players[consoleplayer].mo)
{
sep = 128;
}
else
{
angle = R_PointToAngle2(players[consoleplayer].mo->x,
players[consoleplayer].mo->y, channel[i].mo->x, channel[i].mo->y);
angle = (angle-viewangle)>>24;
sep = angle*2-128;
if(sep < 64)
sep = -sep;
if(sep > 192)
sep = 512-sep;
}
channel[i].pitch = (byte)(127+(M_Random()&7)-(M_Random()&7));
channel[i].handle = I_StartSound(sound_id, S_sfx[sound_id].snd_ptr, vol, sep, channel[i].pitch, 0);
channel[i].mo = origin;
channel[i].sound_id = sound_id;
channel[i].priority = priority;
if(sound_id >= sfx_wind)
{
AmbChan = i;
}
if(S_sfx[sound_id].usefulness == -1)
{
S_sfx[sound_id].usefulness = 1;
}
else
{
S_sfx[sound_id].usefulness++;
}
}
void S_StartSoundAtVolume(mobj_t *origin, int sound_id, int volume)
{
int dist;
int i;
int sep;
static int sndcount;
int chan;
if(sound_id == 0 || snd_MaxVolume == 0)
return;
if(origin == NULL)
{
origin = players[consoleplayer].mo;
}
if(volume == 0)
{
return;
}
volume = (volume*(snd_MaxVolume+1)*8)>>7;
// no priority checking, as ambient sounds would be the LOWEST.
for(i=0; i<snd_Channels; i++)
{
if(channel[i].mo == NULL)
{
break;
}
}
if(i >= snd_Channels)
{
return;
}
if(S_sfx[sound_id].lumpnum == 0)
{
S_sfx[sound_id].lumpnum = I_GetSfxLumpNum(&S_sfx[sound_id]);
}
if(S_sfx[sound_id].snd_ptr == NULL)
{
S_sfx[sound_id].snd_ptr = W_CacheLumpNum(S_sfx[sound_id].lumpnum,
PU_SOUND);
#ifdef __WATCOMC__
_dpmi_lockregion(S_sfx[sound_id].snd_ptr,
lumpinfo[S_sfx[sound_id].lumpnum].size);
#endif
}
channel[i].pitch = (byte)(127-(M_Random()&3)+(M_Random()&3));
channel[i].handle = I_StartSound(sound_id, S_sfx[sound_id].snd_ptr, volume, 128, channel[i].pitch, 0);
channel[i].mo = origin;
channel[i].sound_id = sound_id;
channel[i].priority = 1; //super low priority.
if(S_sfx[sound_id].usefulness == -1)
{
S_sfx[sound_id].usefulness = 1;
}
else
{
S_sfx[sound_id].usefulness++;
}
}
boolean S_StopSoundID(int sound_id, int priority)
{
int i;
int lp; //least priority
int found;
if(S_sfx[sound_id].numchannels == -1)
{
return(true);
}
lp = -1; //denote the argument sound_id
found = 0;
for(i=0; i<snd_Channels; i++)
{
if(channel[i].sound_id == sound_id && channel[i].mo)
{
found++; //found one. Now, should we replace it??
if(priority >= channel[i].priority)
{ // if we're gonna kill one, then this'll be it
lp = i;
priority = channel[i].priority;
}
}
}
if(found < S_sfx[sound_id].numchannels)
{
return(true);
}
else if(lp == -1)
{
return(false); // don't replace any sounds
}
if(channel[lp].handle)
{
if(I_SoundIsPlaying(channel[lp].handle))
{
I_StopSound(channel[lp].handle);
}
if(S_sfx[channel[i].sound_id].usefulness > 0)
{
S_sfx[channel[i].sound_id].usefulness--;
}
channel[lp].mo = NULL;
}
return(true);
}
void S_StopSound(mobj_t *origin)
{
int i;
for(i=0;i<snd_Channels;i++)
{
if(channel[i].mo == origin)
{
I_StopSound(channel[i].handle);
if(S_sfx[channel[i].sound_id].usefulness > 0)
{
S_sfx[channel[i].sound_id].usefulness--;
}
channel[i].handle = 0;
channel[i].mo = NULL;
if(AmbChan == i)
{
AmbChan = -1;
}
}
}
}
void S_SoundLink(mobj_t *oldactor, mobj_t *newactor)
{
int i;
for(i=0;i<snd_Channels;i++)
{
if(channel[i].mo == oldactor)
channel[i].mo = newactor;
}
}
void S_PauseSound(void)
{
I_PauseSong(rs);
}
void S_ResumeSound(void)
{
I_ResumeSong(rs);
}
static int nextcleanup;
void S_UpdateSounds(mobj_t *listener)
{
int i, dist, vol;
int angle;
int sep;
int priority;
int absx;
int absy;
listener = players[consoleplayer].mo;
if(snd_MaxVolume == 0)
{
return;
}
if(nextcleanup < gametic)
{
for(i=0; i < NUMSFX; i++)
{
if(S_sfx[i].usefulness == 0 && S_sfx[i].snd_ptr)
{
if(lumpcache[S_sfx[i].lumpnum])
{
if(((memblock_t *)((byte *)(lumpcache[S_sfx[i].lumpnum])-
sizeof(memblock_t)))->id == 0x1d4a11)
{ // taken directly from the Z_ChangeTag macro
Z_ChangeTag2(lumpcache[S_sfx[i].lumpnum], PU_CACHE);
#ifdef __WATCOMC__
_dpmi_unlockregion(S_sfx[i].snd_ptr, lumpinfo[S_sfx[i].lumpnum].size);
#endif
}
}
S_sfx[i].usefulness = -1;
S_sfx[i].snd_ptr = NULL;
}
}
nextcleanup = gametic+35; //CLEANUP DEBUG cleans every second
}
for(i=0;i<snd_Channels;i++)
{
if(!channel[i].handle || S_sfx[channel[i].sound_id].usefulness == -1)
{
continue;
}
if(!I_SoundIsPlaying(channel[i].handle))
{
if(S_sfx[channel[i].sound_id].usefulness > 0)
{
S_sfx[channel[i].sound_id].usefulness--;
}
channel[i].handle = 0;
channel[i].mo = NULL;
channel[i].sound_id = 0;
if(AmbChan == i)
{
AmbChan = -1;
}
}
if(channel[i].mo == NULL || channel[i].sound_id == 0
|| channel[i].mo == players[consoleplayer].mo)
{
continue;
}
else
{
absx = abs(channel[i].mo->x-players[consoleplayer].mo->x);
absy = abs(channel[i].mo->y-players[consoleplayer].mo->y);
dist = absx+absy-(absx > absy ? absy>>1 : absx>>1);
dist >>= FRACBITS;
// dist = P_AproxDistance(channel[i].mo->x-listener->x, channel[i].mo->y-listener->y)>>FRACBITS;
if(dist >= MAX_SND_DIST)
{
S_StopSound(channel[i].mo);
continue;
}
if(dist < 0)
dist = 0;
// calculate the volume based upon the distance from the sound origin.
// vol = (*((byte *)W_CacheLumpName("SNDCURVE", PU_CACHE)+dist)*(snd_MaxVolume*8))>>7;
vol = soundCurve[dist];
angle = R_PointToAngle2(players[consoleplayer].mo->x,
players[consoleplayer].mo->y, channel[i].mo->x, channel[i].mo->y);
angle = (angle-viewangle)>>24;
sep = angle*2-128;
if(sep < 64)
sep = -sep;
if(sep > 192)
sep = 512-sep;
I_UpdateSoundParams(channel[i].handle, vol, sep, channel[i].pitch);
priority = S_sfx[channel[i].sound_id].priority;
priority *= (10 - (dist>>8));
channel[i].priority = priority;
}
}
}
void S_Init(void)
{
soundCurve = Z_Malloc(MAX_SND_DIST, PU_STATIC, NULL);
I_StartupSound();
if(snd_Channels > 8)
{
snd_Channels = 8;
}
I_SetChannels(snd_Channels);
I_SetMusicVolume(snd_MusicVolume);
S_SetMaxVolume(true);
}
void S_GetChannelInfo(SoundInfo_t *s)
{
int i;
ChanInfo_t *c;
s->channelCount = snd_Channels;
s->musicVolume = snd_MusicVolume;
s->soundVolume = snd_MaxVolume;
for(i = 0; i < snd_Channels; i++)
{
c = &s->chan[i];
c->id = channel[i].sound_id;
c->priority = channel[i].priority;
c->name = S_sfx[c->id].name;
c->mo = channel[i].mo;
c->distance = P_AproxDistance(c->mo->x-viewx, c->mo->y-viewy)
>>FRACBITS;
}
}
void S_SetMaxVolume(boolean fullprocess)
{
int i;
if(!fullprocess)
{
soundCurve[0] = (*((byte *)W_CacheLumpName("SNDCURVE", PU_CACHE))*(snd_MaxVolume*8))>>7;
}
else
{
for(i = 0; i < MAX_SND_DIST; i++)
{
soundCurve[i] = (*((byte *)W_CacheLumpName("SNDCURVE", PU_CACHE)+i)*(snd_MaxVolume*8))>>7;
}
}
}
static boolean musicPaused = false;
void S_SetMusicVolume(void)
{
I_SetMusicVolume(snd_MusicVolume);
if(snd_MusicVolume == 0)
{
I_PauseSong(rs);
musicPaused = true;
}
else if(musicPaused)
{
musicPaused = false;
I_ResumeSong(rs);
}
}
void S_ShutDown(void)
{
extern int tsm_ID;
if(tsm_ID != -1)
{
I_StopSong(rs);
I_UnRegisterSong(rs);
I_ShutdownSound();
}
}
/*
=============================================================================
CONSTANTS
=============================================================================
*/
#define SC_INDEX 0x3C4
#define SC_RESET 0
#define SC_CLOCK 1
#define SC_MAPMASK 2
#define SC_CHARMAP 3
#define SC_MEMMODE 4
#define CRTC_INDEX 0x3D4
#define CRTC_H_TOTAL 0
#define CRTC_H_DISPEND 1
#define CRTC_H_BLANK 2
#define CRTC_H_ENDBLANK 3
#define CRTC_H_RETRACE 4
#define CRTC_H_ENDRETRACE 5
#define CRTC_V_TOTAL 6
#define CRTC_OVERFLOW 7
#define CRTC_ROWSCAN 8
#define CRTC_MAXSCANLINE 9
#define CRTC_CURSORSTART 10
#define CRTC_CURSOREND 11
#define CRTC_STARTHIGH 12
#define CRTC_STARTLOW 13
#define CRTC_CURSORHIGH 14
#define CRTC_CURSORLOW 15
#define CRTC_V_RETRACE 16
#define CRTC_V_ENDRETRACE 17
#define CRTC_V_DISPEND 18
#define CRTC_OFFSET 19
#define CRTC_UNDERLINE 20
#define CRTC_V_BLANK 21
#define CRTC_V_ENDBLANK 22
#define CRTC_MODE 23
#define CRTC_LINECOMPARE 24
#define GC_INDEX 0x3CE
#define GC_SETRESET 0
#define GC_ENABLESETRESET 1
#define GC_COLORCOMPARE 2
#define GC_DATAROTATE 3
#define GC_READMAP 4
#define GC_MODE 5
#define GC_MISCELLANEOUS 6
#define GC_COLORDONTCARE 7
#define GC_BITMASK 8
#define ATR_INDEX 0x3c0
#define ATR_MODE 16
#define ATR_OVERSCAN 17
#define ATR_COLORPLANEENABLE 18
#define ATR_PELPAN 19
#define ATR_COLORSELECT 20
#define STATUS_REGISTER_1 0x3da
#define PEL_WRITE_ADR 0x3c8
#define PEL_READ_ADR 0x3c7
#define PEL_DATA 0x3c9
#define PEL_MASK 0x3c6
boolean grmode;
//==================================================
//
// joystick vars (dummies)
//
//==================================================
boolean joystickpresent = false;
unsigned joystickx, joysticky = 0;
boolean I_ReadJoystick (void) {return false;}
//==================================================
#define VBLCOUNTER 34000 // hardware tics to a frame
#define TIMERINT 8
#define KEYBOARDINT 9
#define CRTCOFF (_inbyte(STATUS_REGISTER_1)&1)
#define CLI _disable()
#define STI _enable()
#define _outbyte(x,y) (outp(x,y))
#define _outhword(x,y) (outpw(x,y))
#define _inbyte(x) (inp(x))
#define _inhword(x) (inpw(x))
#define MOUSEB1 1
#define MOUSEB2 2
#define MOUSEB3 4
boolean mousepresent;
//static int tsm_ID = -1; // tsm init flag
//===============================
int ticcount;
// REGS stuff used for int calls
union REGS regs;
struct SREGS segregs;
boolean novideo; // if true, stay in text mode for debugging
#define KBDQUESIZE 32
byte keyboardque[KBDQUESIZE];
int kbdtail, kbdhead;
#define KEY_LSHIFT 0xfe
#define KEY_INS (0x80+0x52)
#define KEY_DEL (0x80+0x53)
#define KEY_PGUP (0x80+0x49)
#define KEY_PGDN (0x80+0x51)
#define KEY_HOME (0x80+0x47)
#define KEY_END (0x80+0x4f)
#define SC_RSHIFT 0x36
#define SC_LSHIFT 0x2a
byte scantokey[128] =
{
// 0 1 2 3 4 5 6 7
// 8 9 A B C D E F
0 , 27, '1', '2', '3', '4', '5', '6',
'7', '8', '9', '0', '-', '=', KEY_BACKSPACE, 9, // 0
'q', 'w', 'e', 'r', 't', 'y', 'u', 'i',
'o', 'p', '[', ']', 13 , KEY_RCTRL,'a', 's', // 1
'd', 'f', 'g', 'h', 'j', 'k', 'l', ';',
39 , '`', KEY_LSHIFT,92, 'z', 'x', 'c', 'v', // 2
'b', 'n', 'm', ',', '.', '/', KEY_RSHIFT,'*',
KEY_RALT,' ', 0 , KEY_F1, KEY_F2, KEY_F3, KEY_F4, KEY_F5, // 3
KEY_F6, KEY_F7, KEY_F8, KEY_F9, KEY_F10,0 , 0 , KEY_HOME,
KEY_UPARROW,KEY_PGUP,'-',KEY_LEFTARROW,'5',KEY_RIGHTARROW,'+',KEY_END, //4
KEY_DOWNARROW,KEY_PGDN,KEY_INS,KEY_DEL,0,0, 0, KEY_F11,
KEY_F12,0 , 0 , 0 , 0 , 0 , 0 , 0, // 5
0 , 0 , 0 , 0 , 0 , 0 , 0 , 0,
0 , 0 , 0 , 0 , 0 , 0 , 0 , 0, // 6
0 , 0 , 0 , 0 , 0 , 0 , 0 , 0,
0 , 0 , 0 , 0 , 0 , 0 , 0 , 0 // 7
};
//==========================================================================
//--------------------------------------------------------------------------
//
// FUNC I_GetTime
//
// Returns time in 1/35th second tics.
//
//--------------------------------------------------------------------------
int I_GetTime (void)
{
#ifdef NOTIMER
ticcount++;
#endif
return(ticcount);
}
//--------------------------------------------------------------------------
//
// PROC I_ColorBorder
//
//--------------------------------------------------------------------------
void I_ColorBorder(void)
{
int i;
I_WaitVBL(1);
_outbyte(PEL_WRITE_ADR, 0);
for(i = 0; i < 3; i++)
{
_outbyte(PEL_DATA, 63);
}
}
//--------------------------------------------------------------------------
//
// PROC I_UnColorBorder
//
//--------------------------------------------------------------------------
void I_UnColorBorder(void)
{
int i;
I_WaitVBL(1);
_outbyte(PEL_WRITE_ADR, 0);
for(i = 0; i < 3; i++)
{
_outbyte(PEL_DATA, 0);
}
}
/*
============================================================================
USER INPUT
============================================================================
*/
//--------------------------------------------------------------------------
//
// PROC I_WaitVBL
//
//--------------------------------------------------------------------------
void I_WaitVBL(int vbls)
{
int i;
int old;
int stat;
if(novideo)
{
return;
}
while(vbls--)
{
do
{
stat = inp(STATUS_REGISTER_1);
if(stat&8)
{
break;
}
} while(1);
do
{
stat = inp(STATUS_REGISTER_1);
if((stat&8) == 0)
{
break;
}
} while(1);
}
}
//--------------------------------------------------------------------------
//
// PROC I_SetPalette
//
// Palette source must use 8 bit RGB elements.
//
//--------------------------------------------------------------------------
void I_SetPalette(byte *palette)
{
int i;
if(novideo)
{
return;
}
I_WaitVBL(1);
_outbyte(PEL_WRITE_ADR, 0);
for(i = 0; i < 768; i++)
{
_outbyte(PEL_DATA, (gammatable[usegamma][*palette++])>>2);
}
}
/*
============================================================================
GRAPHICS MODE
============================================================================
*/
byte *pcscreen, *destscreen, *destview;
/*
==============
=
= I_Update
=
==============
*/
int UpdateState;
extern int screenblocks;
void I_Update (void)
{
int i;
byte *dest;
int tics;
static int lasttic;
//
// blit screen to video
//
if(DisplayTicker)
{
if(screenblocks > 9 || UpdateState&(I_FULLSCRN|I_MESSAGES))
{
dest = (byte *)screen;
}
else
{
dest = (byte *)pcscreen;
}
tics = ticcount-lasttic;
lasttic = ticcount;
if(tics > 20)
{
tics = 20;
}
for(i = 0; i < tics; i++)
{
*dest = 0xff;
dest += 2;
}
for(i = tics; i < 20; i++)
{
*dest = 0x00;
dest += 2;
}
}
if(UpdateState == I_NOUPDATE)
{
return;
}
if(UpdateState&I_FULLSCRN)
{
memcpy(pcscreen, screen, SCREENWIDTH*SCREENHEIGHT);
UpdateState = I_NOUPDATE; // clear out all draw types
}
if(UpdateState&I_FULLVIEW)
{
if(UpdateState&I_MESSAGES && screenblocks > 7)
{
for(i = 0; i <
(viewwindowy+viewheight)*SCREENWIDTH; i += SCREENWIDTH)
{
memcpy(pcscreen+i, screen+i, SCREENWIDTH);
}
UpdateState &= ~(I_FULLVIEW|I_MESSAGES);
}
else
{
for(i = viewwindowy*SCREENWIDTH+viewwindowx; i <
(viewwindowy+viewheight)*SCREENWIDTH; i += SCREENWIDTH)
{