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dos33fsprogs
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dots: more work on 6502

This commit is contained in:
Vince Weaver 2023-11-27 16:22:06 -05:00
parent fd60bd5953
commit 9903d4ffc5
1 changed files with 48 additions and 42 deletions
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90
utils/gr-sim/dots/dots_6502.c
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@ -18,12 +18,10 @@ static short gravitybottom;
static short gravity=0;
static short gravityd=16;
static struct {
short x; // 0
short y; // 2
short z; // 4
short yadd; // 14
} dot[MAXDOTS];
static short dot_x[MAXDOTS];
static short dot_y[MAXDOTS];
static short dot_z[MAXDOTS];
static short dot_yadd[MAXDOTS];
static short rotsin=0;
static short rotcos=0;
@ -38,21 +36,21 @@ static void drawdots(void) {
for(d=0;d<MAXDOTS;d++) {
transx=dot[d].x*rotsin;
transz=dot[d].z*rotcos;
transx=dot_x[d]*rotsin;
transz=dot_z[d]*rotcos;
temp32=transz-transx;
sc=(temp32>>16)+9000;
if (sc==0) sc=1;
transx=dot[d].x*rotcos;
transz=dot[d].z*rotsin;
transx=dot_x[d]*rotcos;
transz=dot_z[d]*rotsin;
temp32=transx+transz;
temp32>>=8;
#if 1
ax=temp32&0xffff;
dx=(temp32>>16)&0xffff;
bx=ax; // mov bx,ax
bx=ax;
cx=dx; // mov cx,dx
ax=(ax>>3)|(dx<<13); // shrd ax,dx,3
@ -60,16 +58,24 @@ static void drawdots(void) {
signed_ax=dx;
dx=signed_ax>>3;
temp32=temp32>>3;
ax=temp32&0xffff;
dx=(temp32>>16)&0xffff;
temp32=ax+bx; // add ax,bx
ax=ax+bx;
dx=dx+cx; // adc dx,cx
if (temp32&(1<<16)) dx=dx+1;
temp32=(dx<<16)|(ax&0xffff);
#else
temp32=temp32+(temp32>>3);
#endif
ball_x=(temp32/sc)/8;
ball_x+=20;
/* if off end of screen, no need for shadow */
if (ball_x>39) continue;
@ -94,24 +100,24 @@ static void drawdots(void) {
/* ball */
/********/
dot[d].yadd+=gravity;
newy=dot[d].y+dot[d].yadd;
dot_yadd[d]+=gravity;
newy=dot_y[d]+dot_yadd[d];
temp32=newy;
if (temp32&0x8000) temp32|=0xffff0000;
if (temp32>=gravitybottom) {
ax=-dot[d].yadd;
temp32=(-dot[d].yadd)*gravityd;
//ax=-dot_yadd[d];
temp32=(-dot_yadd[d])*gravityd;
ax=temp32&0xffff;
signed_ax=ax;
ax=signed_ax>>4;
dot[d].yadd=ax;
newy+=dot[d].yadd;
dot_yadd[d]=ax;
newy+=dot_yadd[d];
}
dot[d].y=newy;
dot_y[d]=newy;
/* sign extend */
temp32=newy;
@ -181,18 +187,18 @@ int main(int argc,char **argv) {
}
for(a=0;a<MAXDOTS;a++) {
dot[a].x=0;
dot[a].y=2560-dropper;
dot[a].z=0;
dot[a].yadd=0;
dot_x[a]=0;
dot_y[a]=2560-dropper;
dot_z[a]=0;
dot_yadd[a]=0;
}
for(a=0;a<(MAXDOTS-12);a++) { // scramble
b=rand()%MAXDOTS;
c=rand()%MAXDOTS;
d=dot[b].x; dot[b].x=dot[c].x; dot[c].x=d;
d=dot[b].y; dot[b].y=dot[c].y; dot[c].y=d;
d=dot[b].z; dot[b].z=dot[c].z; dot[c].z=d;
d=dot_x[b]; dot_x[b]=dot_x[c]; dot_x[c]=d;
d=dot_y[b]; dot_y[b]=dot_y[c]; dot_y[c]=d;
d=dot_z[b]; dot_z[b]=dot_z[c]; dot_z[c]=d;
}
@ -224,10 +230,10 @@ int main(int argc,char **argv) {
// dot[i].x=isin(f*11)*40;
// dot[i].y=icos(f*13)*10-dropper;
// dot[i].z=isin(f*17)*40;
dot[i].x=isin(f*8)*32;
dot[i].y=icos(f*16)*8-dropper;
dot[i].z=isin(f*16)*32;
dot[i].yadd=0;
dot_x[i]=isin(f*8)*32;
dot_y[i]=icos(f*16)*8-dropper;
dot_z[i]=isin(f*16)*32;
dot_yadd[i]=0;
}
/* bouncing ring */
else if(frame<643) {
@ -235,10 +241,10 @@ int main(int argc,char **argv) {
// dot[i].y=dropper;
// dot[i].z=isin(f*15)*55;
// dot[i].yadd=-260;
dot[i].x=icos(f*16)*48;
dot[i].y=dropper;
dot[i].z=isin(f*16)*48;
dot[i].yadd=-260;
dot_x[i]=icos(f*16)*48;
dot_y[i]=dropper;
dot_z[i]=isin(f*16)*48;
dot_yadd[i]=-260;
}
/* fountain */
else if(frame<1214) {
@ -248,17 +254,17 @@ int main(int argc,char **argv) {
// dot[i].z=isin(f*66)*a;
// dot[i].yadd=-300;
a=sin1024[frame&1023]/8;
dot[i].x=icos(f*64)*a;
dot[i].y=8000;
dot[i].z=isin(f*64)*a;
dot[i].yadd=-300;
dot_x[i]=icos(f*64)*a;
dot_y[i]=8000;
dot_z[i]=isin(f*64)*a;
dot_yadd[i]=-300;
}
/* swirling */
else if(frame<1686) {
dot[i].x=rand()-16384;
dot[i].y=8000-rand()/2;
dot[i].z=rand()-16384;
dot[i].yadd=0;
dot_x[i]=rand()-16384;
dot_y[i]=8000-rand()/2;
dot_z[i]=rand()-16384;
dot_yadd[i]=0;
if(frame>1357 && !(frame&31) && grav>0) grav--;
}