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scroll: pixel wide scroll with (mostly) color conservation

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This commit is contained in:
Vince Weaver 2018-12-18 16:38:06 -05:00
parent 9068de9fe0
commit 021ec733c7
1 changed files with 44 additions and 5 deletions
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49
gr-sim/hgr/scroll.c
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@ -73,21 +73,60 @@ int main(int argc, char **argv) {
*/
int x,y,i,j,addr;
int xx,addr,count=0;
int current,next,high;
while(1) {
for(addr=0x2000;addr<0x4000;addr+=0x80) {
for(x=0;x<40;x++) {
ram[addr+x]=ram[addr+x+1];
for(xx=0;xx<40;xx++) {
current=ram[addr+xx];
next=ram[addr+xx+1];
if ((count%7==2) || (count%7==6)) {
high=next&0x80;
}
else {
high=current&0x80;
}
if (xx==39) next=ram[addr+0x2000];
current>>=2;
current&=0x1f;
current|=high;
current|=(next&3)<<5;
ram[addr+xx]=current;
}
for(xx=0;xx<40;xx++) {
current=ram[addr+0x2000+xx];
next=ram[addr+0x2000+xx+1];
if ((count%7==2) ||(count%7==6)) {
high=next&0x80;
}
else {
high=current&0x80;
}
current>>=2;
current&=0x1f;
current|=high;
current|=(next&3)<<5;
ram[addr+0x2000+xx]=current;
}
}
grsim_update();
ch=grsim_input();
if (ch) break;
usleep(100000);
usleep(17000); // 60Hz = 17ms
count++;
if (count==140) break;
}
while(1) {
ch=grsim_input();
if (ch) break;
}
return 0;
}