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gpu.c
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gpu.c
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#include "gpu.h"
#include "zmath.h"
#include "sfont.h"
#include "globalvar.h"
#define FPMUL(x,y) ((((x)>>6)*((y)>>6))>>4)
#define FPDIV(x,y) ((((x)<<6)/((y)>>6))>>4)
//#define FPDIV(x,y) ((((x)<<6)/((y)>>2)))
#define FPMUL2(x,y) ((((x)>>8)*((y)))>>8)
#define FPMUL3(x,y) ((((x)>>8)*((y)))>>8)
Sint32 matrix2[16],mmatrix[16];
Uint8 vvis[3200],tcolor;
Uint16 zlvertex;
Sint32 vbufferx[3200],vbuffery[3200],vbufferz[3200],txbuffer[4],tybuffer[4],texture;
Uint8 modelcolor;
Sint32 matrixstack[16];
void zlpushmatrix(void)
{
for (Uint8 i=0;i<16;i++)
matrixstack[i]=matrix[i];
}
void zlpopmatrix(void)
{
for (Uint8 i=0;i<16;i++)
matrix[i]=matrixstack[i];
}
void zlpoint(Sint32 vx,Sint32 vy,Sint32 vz)
{
Sint32 x,y,t;
Sint32 v[4],v1[4];
v[0]=vx;v[1]=vy;v[2]=vz;v[3]=65536;
for (t=0;t<4;t++)
{v1[t]=0;
for (x=0;x<4;x++)
v1[t]+=FPMUL(v[x],matrix[x+t*4]);
}
t=v1[2]+dist;
if (t!=0)
if (v1[2]>-dist0)
{
vvis[zlvertex]=1;
vbufferx[zlvertex]=80+FPDIV(FPMUL(v1[0],dist),t);
vbuffery[zlvertex]=60-FPDIV(FPMUL(v1[1],dist),t);
vbufferz[zlvertex]=v1[2];
}else vvis[zlvertex]=0;
}
Sint32 ctexx,ctexy,texx0,texx1,texy0,texy1,dtexx,dtexy,xt,yt,cz0,cz1,cz,dz;
void zltexquada(void)
{
Sint32 i,x,y,x0,y0,x1,y1,x2,y2,x3,y3,xa,xb,xd,z,ly01,ly12,ly02,ly03,ly13,ly23,temp_deltay,temp0,xbxa,tempy;
Sint32 linedat0,linedat13,linedat12,linedat23,linedat2,linedat3;
Sint32 dtex0,dtex1,dtey0,dtey1,dz0,dz1,ly01d,ly02d,ly03d,ly12d,ly13d,ly23d;
Uint8 typeB;
if (vvis[0]&&vvis[1]&&vvis[2]&&vvis[3])
{
Uint8 t,par[4];
par[0]=0;
par[1]=1;
par[2]=2;
par[3]=3;
for (i=0;i<3;i++)
for (int k=0;k<3;k++)
{
if (vbuffery[par[k]]>vbuffery[par[k+1]])
{
t=par[k];
par[k]=par[k+1];
par[k+1]=t;
}
}
x0=vbufferx[par[0]];
x1=vbufferx[par[1]];
x2=vbufferx[par[2]];
x3=vbufferx[par[3]];
y0=vbuffery[par[0]];
y1=vbuffery[par[1]];
y2=vbuffery[par[2]];
y3=vbuffery[par[3]];
if ((y0>screen0_y1)||(y3<screen0_y0)) return;
ly01=(y1-y0);if (ly01) ly01d=65536/ly01;
ly02=(y2-y0);if (ly02) ly02d=65536/ly02;
ly03=(y3-y0);if (ly03) ly03d=65536/ly03;
ly12=(y2-y1);if (ly12) ly12d=65536/ly12;
ly13=(y3-y1);if (ly13) ly13d=65536/ly13;
ly23=(y3-y2);if (ly23) ly23d=65536/ly23;
cz=-(y3-y0);
dz=(x3-x0);
temp_deltay=(x0*cz+y0*dz);
typeB=((((x1)*cz+(y1)*dz-temp_deltay)>>6)*(((x2)*cz+(y2)*dz-temp_deltay)>>6)>1);
if (y1!=y0)
linedat0=((x1-x0)<<8)/(ly01);
if (y2!=y0)
linedat2=((x2-x0)<<8)/(ly02);
if (y3!=y0)
linedat3=((x3-x0)<<8)/(ly03);
if (y2!=y3)
linedat23=((x3-x2)<<8)/(ly23);
if (y1!=y3)
linedat13=((x3-x1)<<8)/(ly13);
if (y1!=y2)
linedat12=((x2-x1)<<8)/(ly12);
{
if (y0!=y1)
if ((y1>=screen0_y0)&&(y0<=screen0_y1))
{
texx1=txbuffer[par[0]];
texy1=tybuffer[par[0]];
texx0=texx1;
texy0=texy1;
cz0=vbufferz[par[0]];
cz1=cz0;
dtex0=FPMUL3(txbuffer[par[1]]-txbuffer[par[0]],ly01d);
dtey0=FPMUL3(tybuffer[par[1]]-tybuffer[par[0]],ly01d);
dz0=FPMUL3(vbufferz[par[1]]-vbufferz[par[0]],ly01d);
if (typeB)
{
dtex1=FPMUL3(txbuffer[par[3]]-txbuffer[par[0]],ly03d);
dtey1=FPMUL3(tybuffer[par[3]]-tybuffer[par[0]],ly03d);
dz1= FPMUL3(vbufferz[par[3]]-vbufferz[par[0]],ly03d);
}
else
{
dtex1=FPMUL3(txbuffer[par[2]]-txbuffer[par[0]],ly02d);
dtey1=FPMUL3(tybuffer[par[2]]-tybuffer[par[0]],ly02d);
dz1= FPMUL3(vbufferz[par[2]]-vbufferz[par[0]],ly02d);
}
for (y=y0;y<y1;y++)
{
if ((y>=screen0_y0)&&(y<screen0_y1))
{
tempy=y*160;
xa=x0+((y-y0)*linedat0>>8);
if (typeB)
xb=x0+((y-y0)*linedat3>>8);
else
xb=x0+((y-y0)*linedat2>>8);
xbxa=xb-xa;
if (xbxa)
{
temp0=65536/xbxa;
dtexx=FPMUL2(texx1-texx0,temp0);
dtexy=FPMUL2(texy1-texy0,temp0);
dz=FPMUL2(cz1-cz0 ,temp0);
ctexy=texy0;
ctexx=texx0;
cz=cz0;
if (xb>xa)
{
if (xb>screen0_x1) xb=screen0_x1;
if ((xa<screen0_x1)&&(xb>screen0_x0))
for (x=xa;x<=xb;x++)
{
xt=ctexx>>12;
yt=ctexy>>12;
xt=xt & 15;
yt=yt & 15;
i=x+tempy;
if ((x>=screen0_x0)&&(x<=screen0_x1))
if (zbuffer0[i]>cz)
{
tcolor=Tile[Tile_offset[texture]+xt+yt*16];
if (tcolor)
{
zbuffer0[i]=cz;
scrbuf0[i]=tcolor;
}
}
ctexx+=dtexx;
ctexy+=dtexy;
cz+=dz;
}
}else
{ if (xb<screen0_x0) xb=screen0_x0;
if ((xb<=screen0_x1)&&(xa>=screen0_x0))
for (x=xa;x>=xb;x--)
{
xt=ctexx>>12;
yt=ctexy>>12;
xt=xt & 15;
yt=yt & 15;
i=x+tempy;
if ((x>=screen0_x0)&&(x<=screen0_x1))
if (zbuffer0[i]>cz)
{
tcolor=Tile[Tile_offset[texture]+xt+yt*16];
if (tcolor)
{
zbuffer0[i]=cz;
scrbuf0[i]=tcolor;
}
}
ctexx-=dtexx;
ctexy-=dtexy;
cz-=dz;
}
}
}
}
texx0+=dtex0;
texy0+=dtey0;
texx1+=dtex1;
texy1+=dtey1;
cz0+=dz0;
cz1+=dz1;
}}
if ((y2!=y1))
if ((y1<=screen0_y1)&&(y2>=screen0_y0))
{
if (typeB)
{
texx0=txbuffer[par[0]]+FPMUL3(txbuffer[par[3]]-txbuffer[par[0]],ly03d)*ly01;
texy0=tybuffer[par[0]]+FPMUL3(tybuffer[par[3]]-tybuffer[par[0]],ly03d)*ly01;
cz0=vbufferz[par[0]]+ FPMUL3(vbufferz[par[3]]-vbufferz[par[0]],ly03d)*ly01;
dtex0=FPMUL3(txbuffer[par[3]]-txbuffer[par[0]],ly03d);
dtey0=FPMUL3(tybuffer[par[3]]-tybuffer[par[0]],ly03d);
dz0= FPMUL3(vbufferz[par[3]]-vbufferz[par[0]],ly03d);
texx1=txbuffer[par[1]];
texy1=tybuffer[par[1]];
cz1= vbufferz[par[1]];
dtex1=FPMUL3(txbuffer[par[2]]-txbuffer[par[1]],ly12d);
dtey1=FPMUL3(tybuffer[par[2]]-tybuffer[par[1]],ly12d);
dz1=FPMUL3(vbufferz[par[2]]-vbufferz[par[1]],ly12d);
}
else
{
texx0=txbuffer[par[1]];
texy0=tybuffer[par[1]];
cz0=vbufferz[par[1]];
dtex0=FPMUL3(txbuffer[par[3]]-txbuffer[par[1]],ly13d);
dtey0=FPMUL3(tybuffer[par[3]]-tybuffer[par[1]],ly13d);
dz0=FPMUL3(vbufferz[par[3]]-vbufferz[par[1]],ly13d);
texx1=txbuffer[par[0]]+FPMUL3(txbuffer[par[2]]-txbuffer[par[0]],ly02d)*ly01;
texy1=tybuffer[par[0]]+FPMUL3(tybuffer[par[2]]-tybuffer[par[0]],ly02d)*ly01;
cz1=vbufferz[par[0]]+ FPMUL3(vbufferz[par[2]]-vbufferz[par[0]],ly02d)*ly01;
dtex1=FPMUL3(txbuffer[par[2]]-txbuffer[par[0]],ly02d);
dtey1=FPMUL3(tybuffer[par[2]]-tybuffer[par[0]],ly02d);
dz1=FPMUL3(vbufferz[par[2]]-vbufferz[par[0]],ly02d);
}
for (y=y1;y<y2;y++)
{
if ((y>=screen0_y0)&&(y<screen0_y1))
{
tempy=y*160;
if (typeB)
{
xa=x0+((y-y0)*linedat3>>8);
xb=x1+((y-y1)*linedat12>>8);
}
else
{
xa=x1+((y-y1)*linedat13>>8);
xb=x0+((y-y0)*linedat2>>8);
}
xbxa=xb-xa;
if (xbxa)
{
temp0=65536/xbxa;
dtexx=FPMUL2(texx1-texx0,temp0);
dtexy=FPMUL2(texy1-texy0,temp0);
dz=FPMUL2(cz1-cz0 ,temp0);
ctexx=texx0;
ctexy=texy0;
cz=cz0;
}
if (xb>xa)
{
if (xb>screen0_x1) xb=screen0_x1;
if ((xa<screen0_x1)&&(xb>screen0_x0))
for (x=xa;x<=xb;x++)
{
xt=ctexx>>12;
yt=ctexy>>12;
xt=xt & 15;
yt=yt & 15;
i=x+tempy;
if ((x>=screen0_x0)&&(x<=screen0_x1))
if (zbuffer0[i]>cz)
{
tcolor=Tile[Tile_offset[texture]+xt+yt*16];
if (tcolor)
{
zbuffer0[i]=cz;
scrbuf0[i]=tcolor;
}
}
ctexx+=dtexx;
ctexy+=dtexy;
cz+=dz;
}
}else
{ if (xb<screen0_x0) xb=screen0_x0;
if ((xb<=screen0_x1)&&(xa>=screen0_x0))
for (x=xa;x>=xb;x--)
{
xt=ctexx>>12;
yt=ctexy>>12;
xt=xt & 15;
yt=yt & 15;
i=x+y*160;
if ((x>=screen0_x0)&&(x<=screen0_x1))
if (zbuffer0[i]>cz)
{
tcolor=Tile[Tile_offset[texture]+xt+yt*16];
if (tcolor)
{
zbuffer0[i]=cz;
scrbuf0[i]=tcolor;
}
}
ctexx-=dtexx;
ctexy-=dtexy;
cz-=dz;
}
}
}
texx0+=dtex0;
texy0+=dtey0;
texx1+=dtex1;
texy1+=dtey1;
cz0+=dz0;
cz1+=dz1;
}
}
/////////////////////////////////////////////////////
if (y2!=y3)
if ((y2<=screen0_y1)&&(y3>=screen0_y0))
{
texx1=txbuffer[par[3]];
texy1=tybuffer[par[3]];
texx0=texx1;
texy0=texy1;
cz0=vbufferz[par[3]];
cz1=cz0;
dtex0=FPMUL3(txbuffer[par[2]]-txbuffer[par[3]],ly23d);
dtey0=FPMUL3(tybuffer[par[2]]-tybuffer[par[3]],ly23d);
dz0=FPMUL3(vbufferz[par[2]]-vbufferz[par[3]],ly23d);
if (typeB)
{
dtex1=FPMUL3(txbuffer[par[0]]-txbuffer[par[3]],ly03d);
dtey1=FPMUL3(tybuffer[par[0]]-tybuffer[par[3]],ly03d);
dz1= FPMUL3(vbufferz[par[0]]-vbufferz[par[3]],ly03d);
}
else
{
dtex1=FPMUL3(txbuffer[par[1]]-txbuffer[par[3]],ly13d);
dtey1=FPMUL3(tybuffer[par[1]]-tybuffer[par[3]],ly13d);
dz1= FPMUL3(vbufferz[par[1]]-vbufferz[par[3]],ly13d);
}
for (y=y3-1;y>=y2;y--)
{
texx0+=dtex0;
texy0+=dtey0;
texx1+=dtex1;
texy1+=dtey1;
cz0+=dz0;
cz1+=dz1;
tempy=y*160;
if ((y>=screen0_y0)&&(y<screen0_y1))
{
xa=x3+((y-y3)*linedat23>>8);
if (typeB)
xb=x3+((y-y3)*linedat3>>8);
else
xb=x3+((y-y3)*linedat13>>8);
xbxa=xb-xa;
if (xbxa)
{
if (xbxa==1)
{
dtexx=0;
dtexy=0;
dz=0;
}
else
{
temp0=65536/xbxa;
dtexx=FPMUL2(texx1-texx0,temp0);
dtexy=FPMUL2(texy1-texy0,temp0);
dz=FPMUL2(cz1-cz0 ,temp0);
}
ctexx=texx0;
ctexy=texy0;
cz=cz0;
if (xb>xa)
{
if (xb>screen0_x1) xb=screen0_x1;
if ((xa<=screen0_x1)&&(xb>=screen0_x0))
for (x=xa;x<=xb;x++)
{
xt=ctexx>>12;
yt=ctexy>>12;
xt=xt & 15;
yt=yt & 15;
i=x+tempy;
if ((x>=screen0_x0)&&(x<=screen0_x1))
if (zbuffer0[i]>cz)
{
tcolor=Tile[Tile_offset[texture]+xt+yt*16];
if (tcolor)
{
zbuffer0[i]=cz;
scrbuf0[i]=tcolor;
}
}
ctexx+=dtexx;
ctexy+=dtexy;
cz+=dz;
}
}else
{
if (xb<screen0_x0) xb=screen0_x0;
if ((xb<=screen0_x1)&&(xa>=screen0_x0))
for (x=xa;x>=xb;x--)
{
xt=ctexx>>12;
yt=ctexy>>12;
xt=xt & 15;
yt=yt & 15;
i=x+tempy;
if ((x>=screen0_x0)&&(x<=screen0_x1))
if (zbuffer0[i]>cz)
{
tcolor=Tile[Tile_offset[texture]+xt+yt*16];
if (tcolor)
{
zbuffer0[i]=cz;
scrbuf0[i]=tcolor;
}
}
ctexx-=dtexx;
ctexy-=dtexy;
cz-=dz;
}
}
}
} }
}
}
}
}//PLEASE PROTECT
void zltexquad(void)
{
Sint32 i,x,y,x0,y0,x1,y1,x2,y2,x3,y3,xa,xb,xd,z,ly01,ly12,ly02,ly03,ly13,ly23,temp_deltay,temp0,xbxa,tempy;
Sint32 linedat0,linedat13,linedat12,linedat23,linedat2,linedat3;
Sint32 dtex0,dtex1,dtey0,dtey1,dz0,dz1,ly01d,ly02d,ly03d,ly12d,ly13d,ly23d;
Uint8 typeB;
if (vvis[0]&&vvis[1]&&vvis[2]&&vvis[3])
{
Uint8 t,par[4];
par[0]=0;
par[1]=1;
par[2]=2;
par[3]=3;
for (i=0;i<3;i++)
for (int k=0;k<3;k++)
{
if (vbuffery[par[k]]>vbuffery[par[k+1]])
{
t=par[k];
par[k]=par[k+1];
par[k+1]=t;
}
}
x0=vbufferx[par[0]];
x1=vbufferx[par[1]];
x2=vbufferx[par[2]];
x3=vbufferx[par[3]];
y0=vbuffery[par[0]];
y1=vbuffery[par[1]];
y2=vbuffery[par[2]];
y3=vbuffery[par[3]];
if ((y0>screen0_y1)||(y3<screen0_y0)) return;
ly01=(y1-y0);if (ly01) ly01d=65536/ly01;
ly02=(y2-y0);if (ly02) ly02d=65536/ly02;
ly03=(y3-y0);if (ly03) ly03d=65536/ly03;
ly12=(y2-y1);if (ly12) ly12d=65536/ly12;
ly13=(y3-y1);if (ly13) ly13d=65536/ly13;
ly23=(y3-y2);if (ly23) ly23d=65536/ly23;
cz=-(y3-y0);
dz=(x3-x0);
temp_deltay=(x0*cz+y0*dz);
typeB=((((x1)*cz+(y1)*dz-temp_deltay)>>6)*(((x2)*cz+(y2)*dz-temp_deltay)>>6)>1);
if (y1!=y0)
linedat0=((x1-x0)<<8)/(ly01);
if (y2!=y0)
linedat2=((x2-x0)<<8)/(ly02);
if (y3!=y0)
linedat3=((x3-x0)<<8)/(ly03);
if (y2!=y3)
linedat23=((x3-x2)<<8)/(ly23);
if (y1!=y3)
linedat13=((x3-x1)<<8)/(ly13);
if (y1!=y2)
linedat12=((x2-x1)<<8)/(ly12);
{
if (y0!=y1)
if ((y1>=screen0_y0)&&(y0<=screen0_y1))
{
texx1=txbuffer[par[0]];
texy1=tybuffer[par[0]];
texx0=texx1;
texy0=texy1;
cz0=vbufferz[par[0]];
cz1=cz0;
dtex0=FPMUL3(txbuffer[par[1]]-txbuffer[par[0]],ly01d);
dtey0=FPMUL3(tybuffer[par[1]]-tybuffer[par[0]],ly01d);
dz0=FPMUL3(vbufferz[par[1]]-vbufferz[par[0]],ly01d);
if (typeB)
{
dtex1=FPMUL3(txbuffer[par[3]]-txbuffer[par[0]],ly03d);
dtey1=FPMUL3(tybuffer[par[3]]-tybuffer[par[0]],ly03d);
dz1= FPMUL3(vbufferz[par[3]]-vbufferz[par[0]],ly03d);
}
else
{
dtex1=FPMUL3(txbuffer[par[2]]-txbuffer[par[0]],ly02d);
dtey1=FPMUL3(tybuffer[par[2]]-tybuffer[par[0]],ly02d);
dz1= FPMUL3(vbufferz[par[2]]-vbufferz[par[0]],ly02d);
}
for (y=y0;y<y1;y++)
{
if ((y>=screen0_y0)&&(y<screen0_y1))
{
tempy=y*160;
xa=x0+((y-y0)*linedat0>>8);
if (typeB)
xb=x0+((y-y0)*linedat3>>8);
else
xb=x0+((y-y0)*linedat2>>8);
xbxa=xb-xa;
if (xbxa)
{
temp0=65536/xbxa;
dtexx=FPMUL2(texx1-texx0,temp0);
dtexy=FPMUL2(texy1-texy0,temp0);
dz=FPMUL2(cz1-cz0 ,temp0);
ctexy=texy0;
ctexx=texx0;
cz=cz0;
if (xb>xa)
{
if (xb>screen0_x1) xb=screen0_x1;
if ((xa<screen0_x1)&&(xb>screen0_x0))
for (x=xa;x<=xb;x++)
{
xt=ctexx>>12;
yt=ctexy>>12;
xt=xt & 15;
yt=yt & 15;
i=x+tempy;
if ((x>=screen0_x0)&&(x<=screen0_x1))
if (zbuffer0[i]>cz)
{
tcolor=Tile[Tile_offset[texture]+xt+yt*16];
zbuffer0[i]=cz;
scrbuf0[i]=tcolor;
}
ctexx+=dtexx;
ctexy+=dtexy;
cz+=dz;
}
}else
{ if (xb<screen0_x0) xb=screen0_x0;
if ((xb<=screen0_x1)&&(xa>=screen0_x0))
for (x=xa;x>=xb;x--)
{
xt=ctexx>>12;
yt=ctexy>>12;
xt=xt & 15;
yt=yt & 15;
i=x+tempy;
if ((x>=screen0_x0)&&(x<=screen0_x1))
if (zbuffer0[i]>cz)
{
tcolor=Tile[Tile_offset[texture]+xt+yt*16];
zbuffer0[i]=cz;
scrbuf0[i]=tcolor;
}
ctexx-=dtexx;
ctexy-=dtexy;
cz-=dz;
}
}
}
}
texx0+=dtex0;
texy0+=dtey0;
texx1+=dtex1;
texy1+=dtey1;
cz0+=dz0;
cz1+=dz1;
}}
if ((y2!=y1))
if ((y1<=screen0_y1)&&(y2>=screen0_y0))
{
if (typeB)
{
texx0=txbuffer[par[0]]+FPMUL3(txbuffer[par[3]]-txbuffer[par[0]],ly03d)*ly01;
texy0=tybuffer[par[0]]+FPMUL3(tybuffer[par[3]]-tybuffer[par[0]],ly03d)*ly01;
cz0=vbufferz[par[0]]+ FPMUL3(vbufferz[par[3]]-vbufferz[par[0]],ly03d)*ly01;
dtex0=FPMUL3(txbuffer[par[3]]-txbuffer[par[0]],ly03d);
dtey0=FPMUL3(tybuffer[par[3]]-tybuffer[par[0]],ly03d);
dz0= FPMUL3(vbufferz[par[3]]-vbufferz[par[0]],ly03d);
texx1=txbuffer[par[1]];
texy1=tybuffer[par[1]];
cz1= vbufferz[par[1]];
dtex1=FPMUL3(txbuffer[par[2]]-txbuffer[par[1]],ly12d);
dtey1=FPMUL3(tybuffer[par[2]]-tybuffer[par[1]],ly12d);
dz1=FPMUL3(vbufferz[par[2]]-vbufferz[par[1]],ly12d);
}
else
{
texx0=txbuffer[par[1]];
texy0=tybuffer[par[1]];
cz0=vbufferz[par[1]];
dtex0=FPMUL3(txbuffer[par[3]]-txbuffer[par[1]],ly13d);
dtey0=FPMUL3(tybuffer[par[3]]-tybuffer[par[1]],ly13d);
dz0=FPMUL3(vbufferz[par[3]]-vbufferz[par[1]],ly13d);
texx1=txbuffer[par[0]]+FPMUL3(txbuffer[par[2]]-txbuffer[par[0]],ly02d)*ly01;
texy1=tybuffer[par[0]]+FPMUL3(tybuffer[par[2]]-tybuffer[par[0]],ly02d)*ly01;
cz1=vbufferz[par[0]]+ FPMUL3(vbufferz[par[2]]-vbufferz[par[0]],ly02d)*ly01;
dtex1=FPMUL3(txbuffer[par[2]]-txbuffer[par[0]],ly02d);
dtey1=FPMUL3(tybuffer[par[2]]-tybuffer[par[0]],ly02d);
dz1=FPMUL3(vbufferz[par[2]]-vbufferz[par[0]],ly02d);
}
for (y=y1;y<y2;y++)
{
if ((y>=screen0_y0)&&(y<screen0_y1))
{
tempy=y*160;
if (typeB)
{
xa=x0+((y-y0)*linedat3>>8);
xb=x1+((y-y1)*linedat12>>8);
}
else
{
xa=x1+((y-y1)*linedat13>>8);
xb=x0+((y-y0)*linedat2>>8);
}
xbxa=xb-xa;
if (xbxa)
{
temp0=65536/xbxa;
dtexx=FPMUL2(texx1-texx0,temp0);
dtexy=FPMUL2(texy1-texy0,temp0);
dz=FPMUL2(cz1-cz0 ,temp0);
ctexx=texx0;
ctexy=texy0;
cz=cz0;
}
if (xb>xa)
{
if (xb>screen0_x1) xb=screen0_x1;
if ((xa<screen0_x1)&&(xb>screen0_x0))
for (x=xa;x<=xb;x++)
{
xt=ctexx>>12;
yt=ctexy>>12;
xt=xt & 15;
yt=yt & 15;
i=x+tempy;
if ((x>=screen0_x0)&&(x<=screen0_x1))
if (zbuffer0[i]>cz)
{
tcolor=Tile[Tile_offset[texture]+xt+yt*16];
zbuffer0[i]=cz;
scrbuf0[i]=tcolor;
}
ctexx+=dtexx;
ctexy+=dtexy;
cz+=dz;
}
}else
{ if (xb<screen0_x0) xb=screen0_x0;
if ((xb<=screen0_x1)&&(xa>=screen0_x0))
for (x=xa;x>=xb;x--)
{
xt=ctexx>>12;
yt=ctexy>>12;
xt=xt & 15;
yt=yt & 15;
i=x+y*160;
if ((x>=screen0_x0)&&(x<=screen0_x1))
if (zbuffer0[i]>cz)
{
tcolor=Tile[Tile_offset[texture]+xt+yt*16];
zbuffer0[i]=cz;
scrbuf0[i]=tcolor;
}
ctexx-=dtexx;
ctexy-=dtexy;
cz-=dz;
}
}
}
texx0+=dtex0;
texy0+=dtey0;
texx1+=dtex1;
texy1+=dtey1;
cz0+=dz0;
cz1+=dz1;
}
}
/////////////////////////////////////////////////////
if (y2!=y3)
if ((y2<=screen0_y1)&&(y3>=screen0_y0))
{
texx1=txbuffer[par[3]];
texy1=tybuffer[par[3]];
texx0=texx1;
texy0=texy1;
cz0=vbufferz[par[3]];
cz1=cz0;
dtex0=FPMUL3(txbuffer[par[2]]-txbuffer[par[3]],ly23d);
dtey0=FPMUL3(tybuffer[par[2]]-tybuffer[par[3]],ly23d);
dz0=FPMUL3(vbufferz[par[2]]-vbufferz[par[3]],ly23d);
if (typeB)
{
dtex1=FPMUL3(txbuffer[par[0]]-txbuffer[par[3]],ly03d);
dtey1=FPMUL3(tybuffer[par[0]]-tybuffer[par[3]],ly03d);
dz1= FPMUL3(vbufferz[par[0]]-vbufferz[par[3]],ly03d);
}
else
{
dtex1=FPMUL3(txbuffer[par[1]]-txbuffer[par[3]],ly13d);
dtey1=FPMUL3(tybuffer[par[1]]-tybuffer[par[3]],ly13d);
dz1= FPMUL3(vbufferz[par[1]]-vbufferz[par[3]],ly13d);
}
//Sint32 cleverZ=vbufferz[par[3]];
for (y=y3-1;y>=y2;y--)
{
texx0+=dtex0;
texy0+=dtey0;
texx1+=dtex1;
texy1+=dtey1;
cz0+=dz0;
cz1+=dz1;
//if (cz0<cleverZ) cz0=cleverZ;
//if (cz1<cleverZ) cz1=cleverZ;
tempy=y*160;
if ((y>=screen0_y0)&&(y<screen0_y1))
{
xa=x3+((y-y3)*linedat23>>8);
if (typeB)
xb=x3+((y-y3)*linedat3>>8);
else
xb=x3+((y-y3)*linedat13>>8);
xbxa=xb-xa;
if (xbxa)
{
if (zabs(xbxa)>3)
{
temp0=65536/xbxa;
dtexx=FPMUL2(texx1-texx0,temp0);
dtexy=FPMUL2(texy1-texy0,temp0);
dz=FPMUL2(cz1-cz0 ,temp0);
}
ctexx=texx0;
ctexy=texy0;
cz=cz0;
//dz=0;
if (xb>xa)
{
if (xb>screen0_x1) xb=screen0_x1;
if ((xa<=screen0_x1)&&(xb>=screen0_x0))
for (x=xa;x<=xb;x++)
{
xt=ctexx>>12;
yt=ctexy>>12;
xt=xt & 15;
yt=yt & 15;
i=x+tempy;
if ((x>=screen0_x0)&&(x<=screen0_x1))
if (zbuffer0[i]>cz)
{
tcolor=Tile[Tile_offset[texture]+xt+yt*16];
zbuffer0[i]=cz;
scrbuf0[i]=tcolor;
}
ctexx+=dtexx;
ctexy+=dtexy;
cz+=dz;
}
}else
{
if (xb<screen0_x0) xb=screen0_x0;
if ((xb<=screen0_x1)&&(xa>=screen0_x0))
for (x=xa;x>=xb;x--)
{
xt=ctexx>>12;
yt=ctexy>>12;
xt=xt & 15;
yt=yt & 15;
i=x+tempy;
if ((x>=screen0_x0)&&(x<=screen0_x1))
if (zbuffer0[i]>cz)
{
tcolor=Tile[Tile_offset[texture]+xt+yt*16];
zbuffer0[i]=cz;
scrbuf0[i]=tcolor;
}
ctexx-=dtexx;
ctexy-=dtexy;
cz-=dz;
}
}
}
//texx0+=dtex0;
//texy0+=dtey0;
//texx1+=dtex1;
//texy1+=dtey1;
//cz0+=dz0;
//cz1+=dz1;
}
} }
}
}
}//PLEASE PROTECT
void matrixmul(void)
{
int x,y,i;
for (y=0;y<4;y++)
for (x=0;x<4;x++)
{
mmatrix[x+y*4]=0;
for (i=0;i<4;i++)
mmatrix[x+y*4]+=FPMUL(matrix[i+y*4],matrix2[x+i*4]);
}
for (i=0;i<16;i++) matrix[i]=mmatrix[i];
}
void zlrotatey(Sint32 alpha)
{
Sint32 sy = f_sin[alpha];
Sint32 cy = f_cos[alpha];