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id_rf.c
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id_rf.c
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/* Keen Dreams Source Code
* Copyright (C) 2014 Javier M. Chavez
*
* 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_RF.C
/*
=============================================================================
notes
-----
scrolling more than one tile / refresh forces a total redraw
two overlapping sprites of equal priority can change drawing order when
updated
=============================================================================
*/
#include "ID_HEADS.H"
#pragma hdrstop
/*
=============================================================================
LOCAL CONSTANTS
=============================================================================
*/
#define SCREENTILESWIDE 20
#define SCREENTILESHIGH 13
#define SCREENSPACE (SCREENWIDTH*240)
#define FREEEGAMEM (0x10000l-3l*SCREENSPACE)
//
// the update array must have enough space for two screens that can float
// up two two tiles each way
//
// (PORTTILESWIDE+1)*PORTTILESHIGH must be even so the arrays can be cleared
// by word width instructions
#define UPDATESCREENSIZE (UPDATEWIDE*PORTTILESHIGH+2)
#define UPDATESPARESIZE (UPDATEWIDE*2+4)
#define UPDATESIZE (UPDATESCREENSIZE+2*UPDATESPARESIZE)
#define G_EGASX_SHIFT 7 // global >> ?? = screen x
#define G_CGASX_SHIFT 6 // global >> ?? = screen x
#define G_SY_SHIFT 4 // global >> ?? = screen y
unsigned SX_T_SHIFT; // screen x >> ?? = tile EGA = 1, CGA = 2;
#define SY_T_SHIFT 4 // screen y >> ?? = tile
#define EGAPORTSCREENWIDE 42
#define CGAPORTSCREENWIDE 84
#define PORTSCREENHIGH 224
#define UPDATESCREENSIZE (UPDATEWIDE*PORTTILESHIGH+2)
#define UPDATESPARESIZE (UPDATEWIDE*2+4)
#define UPDATESIZE (UPDATESCREENSIZE+2*UPDATESPARESIZE)
/*
=============================================================================
LOCAL TYPES
=============================================================================
*/
typedef struct spriteliststruct
{
int screenx,screeny;
int width,height;
unsigned grseg,sourceofs,planesize;
drawtype draw;
unsigned tilex,tiley,tilewide,tilehigh;
int priority,updatecount;
struct spriteliststruct **prevptr,*nextsprite;
} spritelisttype;
typedef struct
{
int screenx,screeny;
int width,height;
} eraseblocktype;
typedef struct
{
unsigned current; // foreground tiles have high bit set
int count;
} tiletype;
typedef struct animtilestruct
{
unsigned x,y,tile;
tiletype *chain;
unsigned far *mapplane;
struct animtilestruct **prevptr,*nexttile;
} animtiletype;
/*
=============================================================================
GLOBAL VARIABLES
=============================================================================
*/
unsigned tics;
long lasttimecount;
boolean compatability; // crippled refresh for wierdo SVGAs
unsigned mapwidth,mapheight,mapbyteswide,mapwordswide
,mapbytesextra,mapwordsextra;
unsigned mapbwidthtable[MAXMAPHEIGHT];
//
// Global : Actor coordinates are in this, at 1/16 th of a pixel, to allow
// for fractional movement and acceleration.
//
// Tiles : Tile offsets from the upper left corner of the current map.
//
// Screen : Graphics level offsets from map origin, x in bytes, y in pixels.
// originxscreen is the same spot as originxtile, just with extra precision
// so graphics don't need to be done in tile boundaries.
//
unsigned originxglobal,originyglobal;
unsigned originxtile,originytile;
unsigned originxscreen,originyscreen;
unsigned originmap;
unsigned originxmin,originxmax,originymin,originymax;
unsigned originxtile,originytile;
unsigned masterofs;
//
// Table of the offsets from bufferofs of each tile spot in the
// view port. The extra wide tile should never be drawn, but the space
// is needed to account for the extra 0 in the update arrays. Built by
// RF_Startup
//
unsigned blockstarts[UPDATEWIDE*UPDATEHIGH];
unsigned updatemapofs[UPDATEWIDE*UPDATEHIGH];
unsigned uwidthtable[PORTTILESHIGH]; // lookup instead of multiply
byte update[2][UPDATESIZE];
byte *updateptr,*baseupdateptr, // current start of update window
*updatestart[2],
*baseupdatestart[2];
/*
=============================================================================
LOCAL VARIABLES
=============================================================================
*/
static char scratch[20],str[20];
tiletype allanims[MAXANIMTYPES];
unsigned numanimchains;
void (*refreshvector) (void);
unsigned screenstart[3] =
{0,SCREENSPACE,SCREENSPACE*2};
unsigned xpanmask; // prevent panning to odd pixels
unsigned screenpage; // screen currently being displayed
unsigned otherpage;
#if GRMODE == EGAGR
unsigned tilecache[NUMTILE16];
#endif
spritelisttype spritearray[MAXSPRITES],*prioritystart[PRIORITIES],
*spritefreeptr;
animtiletype animarray[MAXANIMTILES],*animhead,*animfreeptr;
int animfreespot;
eraseblocktype eraselist[2][MAXSPRITES],*eraselistptr[2];
/*
=============================================================================
LOCAL PROTOTYPES
=============================================================================
*/
void RFL_NewTile (unsigned updateoffset);
void RFL_MaskForegroundTiles (void);
void RFL_UpdateTiles (void);
void RFL_CalcOriginStuff (long x, long y);
void RFL_InitSpriteList (void);
void RFL_InitAnimList (void);
void RFL_CheckForAnimTile (unsigned x, unsigned y);
void RFL_AnimateTiles (void);
void RFL_RemoveAnimsOnX (unsigned x);
void RFL_RemoveAnimsOnY (unsigned y);
void RFL_EraseBlocks (void);
void RFL_UpdateSprites (void);
/*
=============================================================================
GRMODE INDEPENDANT ROUTINES
=============================================================================
*/
/*
=====================
=
= RF_Startup
=
=====================
*/
static char *ParmStrings[] = {"comp",""};
void RF_Startup (void)
{
int i,x,y;
unsigned *blockstart;
if (grmode == EGAGR)
for (i = 1;i < _argc;i++)
if (US_CheckParm(_argv[i],ParmStrings) == 0)
{
compatability = true;
break;
}
for (i=0;i<PORTTILESHIGH;i++)
uwidthtable[i] = UPDATEWIDE*i;
originxmin = originymin = MAPBORDER*TILEGLOBAL;
eraselistptr[0] = &eraselist[0][0];
eraselistptr[1] = &eraselist[1][0];
if (grmode == EGAGR)
{
SX_T_SHIFT = 1;
baseupdatestart[0] = &update[0][UPDATESPARESIZE];
baseupdatestart[1] = &update[1][UPDATESPARESIZE];
screenpage = 0;
otherpage = 1;
displayofs = screenstart[screenpage];
bufferofs = screenstart[otherpage];
masterofs = screenstart[2];
updateptr = baseupdatestart[otherpage];
blockstart = &blockstarts[0];
for (y=0;y<UPDATEHIGH;y++)
for (x=0;x<UPDATEWIDE;x++)
*blockstart++ = SCREENWIDTH*16*y+x*TILEWIDTH;
xpanmask = 6; // dont pan to odd pixels
}
else if (grmode == CGAGR)
{
SX_T_SHIFT = 2;
updateptr = baseupdateptr = &update[0][UPDATESPARESIZE];
bufferofs = 0;
masterofs = 0x8000;
blockstart = &blockstarts[0];
for (y=0;y<UPDATEHIGH;y++)
for (x=0;x<UPDATEWIDE;x++)
*blockstart++ = SCREENWIDTH*16*y+x*TILEWIDTH;
}
}
/*
=====================
=
= RF_Shutdown
=
=====================
*/
void RF_Shutdown (void)
{
}
//===========================================================================
/*
=====================
=
= RF_NewMap
=
= Makes some convienient calculations based on maphead->
=
=====================
*/
void RF_NewMap (void)
{
int i,x,y;
unsigned spot,*table;
mapwidth = mapheaderseg[mapon]->width;
mapbyteswide = 2*mapwidth;
mapheight = mapheaderseg[mapon]->height;
mapwordsextra = mapwidth-PORTTILESWIDE;
mapbytesextra = 2*mapwordsextra;
//
// make a lookup table for the maps left edge
//
spot = 0;
for (i=0;i<mapheight;i++)
{
mapbwidthtable[i] = spot;
spot += mapbyteswide;
}
//
// fill in updatemapofs with the new width info
//
table = &updatemapofs[0];
for (y=0;y<PORTTILESHIGH;y++)
for (x=0;x<UPDATEWIDE;x++)
*table++ = mapbwidthtable[y]+x*2;
//
// the y max value clips off the bottom half of a tile so a map that is
// 13 + MAPBORDER*2 tile high will not scroll at all vertically
//
originxmax = (mapwidth-MAPBORDER-SCREENTILESWIDE)*TILEGLOBAL;
originymax = (mapheight-MAPBORDER-SCREENTILESHIGH)*TILEGLOBAL;
if (originxmax<originxmin) // for very small maps
originxmax=originxmin;
if (originymax<originymin)
originymax=originymin;
//
// clear out the lists
//
RFL_InitSpriteList ();
RFL_InitAnimList ();
lasttimecount = TimeCount; // setup for adaptive timing
tics = 1;
}
//===========================================================================
/*
==========================
=
= RF_MarkTileGraphics
=
= Goes through mapplane[0/1] and marks all background/foreground tiles
= needed, then follows all animation sequences to make sure animated
= tiles get all the stages. Every unique animating tile is given an
= entry in allanims[], so every instance of that tile will animate at the
= same rate. The info plane for each animating tile will hold a pointer
= into allanims[], therefore you can't have both an animating foreground
= and background tile in the same spot!
=
==========================
*/
void RF_MarkTileGraphics (void)
{
unsigned size;
int tile,next,anims;
unsigned far *start,far *end,far *info;
unsigned i,tilehigh;
memset (allanims,0,sizeof(allanims));
numanimchains = 0;
size = mapwidth*mapheight;
//
// background plane
//
start = mapsegs[0];
info = mapsegs[2];
end = start+size;
do
{
tile = *start++;
if (tile>=0) // <0 is a tile that is never drawn
{
CA_MarkGrChunk(STARTTILE16+tile);
if (tinf[ANIM+tile])
{
// this tile will animated
for (i=0;i<numanimchains;i++)
if (allanims[i].current == tile)
{
*info = (unsigned)&allanims[i];
goto nextback;
}
// new chain of animating tiles
if (i>=MAXANIMTYPES)
Quit ("RF_MarkTileGraphics: Too many unique animated tiles!");
allanims[i].current = tile;
allanims[i].count = tinf[SPEED+tile];
*info = (unsigned)&allanims[i];
numanimchains++;
anims = 0;
next = tile+(signed char)(tinf[ANIM+tile]);
while (next != tile)
{
CA_MarkGrChunk(STARTTILE16+next);
next += (signed char)(tinf[ANIM+next]);
if (++anims > 20)
Quit ("MarkTileGraphics: Unending animation!");
}
}
}
nextback:
info++;
} while (start<end);
//
// foreground plane
//
start = mapsegs[1];
info = mapsegs[2];
end = start+size;
do
{
tile = *start++;
if (tile>=0) // <0 is a tile that is never drawn
{
CA_MarkGrChunk(STARTTILE16M+tile);
if (tinf[MANIM+tile])
{
// this tile will animated
tilehigh = tile | 0x8000; // foreground tiles have high bit
for (i=0;i<numanimchains;i++)
if (allanims[i].current == tilehigh)
{
*info = (unsigned)&allanims[i];
goto nextfront;
}
// new chain of animating tiles
if (i>=MAXANIMTYPES)
Quit ("RF_MarkTileGraphics: Too many unique animated tiles!");
allanims[i].current = tilehigh;
allanims[i].count = tinf[MSPEED+tile];
*info = (unsigned)&allanims[i];
numanimchains++;
anims = 0;
next = tile+(signed char)(tinf[MANIM+tile]);
while (next != tile)
{
CA_MarkGrChunk(STARTTILE16M+next);
next += (signed char)(tinf[MANIM+next]);
if (++anims > 20)
Quit ("MarkTileGraphics: Unending animation!");
}
}
}
nextfront:
info++;
} while (start<end);
}
//===========================================================================
/*
=========================
=
= RFL_InitAnimList
=
= Call to clear out the entire animating tile list and return all of them to
= the free list.
=
=========================
*/
void RFL_InitAnimList (void)
{
int i;
animfreeptr = &animarray[0];
for (i=0;i<MAXANIMTILES-1;i++)
animarray[i].nexttile = &animarray[i+1];
animarray[i].nexttile = NULL;
animhead = NULL; // nothing in list
}
/*
====================
=
= RFL_CheckForAnimTile
=
====================
*/
void RFL_CheckForAnimTile (unsigned x, unsigned y)
{
unsigned tile,offset,speed,lasttime,thistime,timemissed;
unsigned far *map;
animtiletype *anim,*next;
// the info plane of each animating tile has a near pointer into allanims[]
// which gives the current state of all concurrently animating tiles
offset = mapbwidthtable[y]/2+x;
//
// background
//
map = mapsegs[0]+offset;
tile = *map;
if (tinf[ANIM+tile])
{
if (!animfreeptr)
Quit ("RF_CheckForAnimTile: No free spots in tilearray!");
anim = animfreeptr;
animfreeptr = animfreeptr->nexttile;
next = animhead; // stick it at the start of the list
animhead = anim;
if (next)
next->prevptr = &anim->nexttile;
anim->nexttile = next;
anim->prevptr = &animhead;
anim->x = x;
anim->y = y;
anim->tile = tile;
anim->mapplane = map;
anim->chain = (tiletype *)*(mapsegs[2]+offset);
}
//
// foreground
//
map = mapsegs[1]+offset;
tile = *map;
if (tinf[MANIM+tile])
{
if (!animfreeptr)
Quit ("RF_CheckForAnimTile: No free spots in tilearray!");
anim = animfreeptr;
animfreeptr = animfreeptr->nexttile;
next = animhead; // stick it at the start of the list
animhead = anim;
if (next)
next->prevptr = &anim->nexttile;
anim->nexttile = next;
anim->prevptr = &animhead;
anim->x = x;
anim->y = y;
anim->tile = tile;
anim->mapplane = map;
anim->chain = (tiletype *)*(mapsegs[2]+offset);
}
}
/*
====================
=
= RFL_RemoveAnimsOnX
=
====================
*/
void RFL_RemoveAnimsOnX (unsigned x)
{
animtiletype *current,*next;
current = animhead;
while (current)
{
if (current->x == x)
{
*(void **)current->prevptr = current->nexttile;
if (current->nexttile)
current->nexttile->prevptr = current->prevptr;
next = current->nexttile;
current->nexttile = animfreeptr;
animfreeptr = current;
current = next;
}
else
current = current->nexttile;
}
}
/*
====================
=
= RFL_RemoveAnimsOnY
=
====================
*/
void RFL_RemoveAnimsOnY (unsigned y)
{
animtiletype *current,*next;
current = animhead;
while (current)
{
if (current->y == y)
{
*(void **)current->prevptr = current->nexttile;
if (current->nexttile)
current->nexttile->prevptr = current->prevptr;
next = current->nexttile;
current->nexttile = animfreeptr;
animfreeptr = current;
current = next;
}
else
current = current->nexttile;
}
}
/*
====================
=
= RFL_AnimateTiles
=
====================
*/
void RFL_AnimateTiles (void)
{
animtiletype *current;
unsigned updateofs,tile,x,y;
tiletype *anim;
//
// animate the lists of tiles
//
anim = &allanims[0];
while (anim->current)
{
anim->count-=tics;
while ( anim->count < 1)
{
if (anim->current & 0x8000)
{
tile = anim->current & 0x7fff;
tile += (signed char)tinf[MANIM+tile];
anim->count += tinf[MSPEED+tile];
tile |= 0x8000;
}
else
{
tile = anim->current;
tile += (signed char)tinf[ANIM+tile];
anim->count += tinf[SPEED+tile];
}
anim->current = tile;
}
anim++;
}
//
// traverse the list of animating tiles
//
current = animhead;
while (current)
{
tile =current->chain->current;
if ( tile != current->tile)
{
// tile has animated
//
// remove tile from master screen cache,
// change a tile to its next state, set the structure up for
// next animation, and post an update region to both update pages
//
current->tile = tile;
*(current->mapplane) = tile & 0x7fff; // change in map
#if GRMODE == EGAGR
if (tile<0x8000) // background
tilecache[tile] = 0;
#endif
x = current->x-originxtile;
y = current->y-originytile;
if (x>=PORTTILESWIDE || y>=PORTTILESHIGH)
Quit ("RFL_AnimateTiles: Out of bounds!");
updateofs = uwidthtable[y] + x;
RFL_NewTile(updateofs); // puts "1"s in both pages
}
current = current->nexttile;
}
}
//===========================================================================
/*
=========================
=
= RFL_InitSpriteList
=
= Call to clear out the entire sprite list and return all of them to
= the free list.
=
=========================
*/
void RFL_InitSpriteList (void)
{
int i;
spritefreeptr = &spritearray[0];
for (i=0;i<MAXSPRITES-1;i++)
spritearray[i].nextsprite = &spritearray[i+1];
spritearray[i].nextsprite = NULL;
// NULL in all priority levels
memset (prioritystart,0,sizeof(prioritystart));
}
//===========================================================================
/*
=================
=
= RFL_CalcOriginStuff
=
= Calculate all the global variables for a new position
= Long parms so position can be clipped to a maximum near 64k
=
=================
*/
void RFL_CalcOriginStuff (long x, long y)
{
if (x<originxmin)
x=originxmin;
else if (x>originxmax)
x=originxmax;
if (y<originymin)
y=originymin;
else if (y>originymax)
y=originymax;
originxglobal = x;
originyglobal = y;
originxtile = originxglobal>>G_T_SHIFT;
originytile = originyglobal>>G_T_SHIFT;
originxscreen = originxtile<<SX_T_SHIFT;
originyscreen = originytile<<SY_T_SHIFT;
originmap = mapbwidthtable[originytile] + originxtile*2;
#if GRMODE == EGAGR
panx = (originxglobal>>G_P_SHIFT) & 15;
pansx = panx & 8;
pany = pansy = (originyglobal>>G_P_SHIFT) & 15;
panadjust = panx/8 + ylookup[pany];
#endif
#if GRMODE == CGAGR
panx = (originxglobal>>G_P_SHIFT) & 15;
pansx = panx & 12;
pany = pansy = (originyglobal>>G_P_SHIFT) & 15;
panadjust = pansx/4 + ylookup[pansy];
#endif
}
//===========================================================================
/*
=====================
=
= RF_SetRefreshHook
=
=====================
*/
void RF_SetRefreshHook (void (*func) (void) )
{
refreshvector = func;
}
/*
=================
=
= RFL_NewRow
=
= Bring a new row of tiles onto the port, spawning animating tiles
=
=================
*/
void RFL_NewRow (int dir)
{
unsigned count,updatespot,updatestep;
int x,y,xstep,ystep;
switch (dir)
{
case 0: // top row
updatespot = 0;
updatestep = 1;
x = originxtile;
y = originytile;
xstep = 1;
ystep = 0;
count = PORTTILESWIDE;
break;
case 1: // right row
updatespot = PORTTILESWIDE-1;
updatestep = UPDATEWIDE;
x = originxtile + PORTTILESWIDE-1;
y = originytile;
xstep = 0;
ystep = 1;
count = PORTTILESHIGH;
break;
case 2: // bottom row
updatespot = UPDATEWIDE*(PORTTILESHIGH-1);
updatestep = 1;
x = originxtile;
y = originytile + PORTTILESHIGH-1;
xstep = 1;
ystep = 0;
count = PORTTILESWIDE;
break;
case 3: // left row
updatespot = 0;
updatestep = UPDATEWIDE;
x = originxtile;
y = originytile;
xstep = 0;
ystep = 1;
count = PORTTILESHIGH;
break;
default:
Quit ("RFL_NewRow: Bad dir!");
}
while (count--)
{
RFL_NewTile(updatespot);
RFL_CheckForAnimTile (x,y);
updatespot+=updatestep;
x+=xstep;
y+=ystep;
}
}
//===========================================================================
/*
=====================
=
= RF_ForceRefresh
=
=====================
*/
void RF_ForceRefresh (void)
{
RF_NewPosition (originxglobal,originyglobal);
RF_Refresh ();
RF_Refresh ();
}
/*
=============================================================================
EGA specific routines
=============================================================================
*/
#if GRMODE == EGAGR
/*
=====================
=
= RF_NewPosition EGA
=
=====================
*/
void RF_NewPosition (unsigned x, unsigned y)
{
int mx,my;
byte *page0ptr,*page1ptr;
unsigned updatenum;
//
// calculate new origin related globals
//
RFL_CalcOriginStuff (x,y);
//
// clear out all animating tiles
//
RFL_InitAnimList ();
//
// set up the new update arrays at base position
//
memset (tilecache,0,sizeof(tilecache)); // old cache is invalid
updatestart[0] = baseupdatestart[0];
updatestart[1] = baseupdatestart[1];
page0ptr = updatestart[0]+PORTTILESWIDE; // used to stick "0"s after rows
page1ptr = updatestart[1]+PORTTILESWIDE;
updatenum = 0; // start at first visable tile