empathicqubit/langtoncant
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

cleaning up the mess

Browse source
This commit is contained in:
Bjorn Einar Bjarntes 2021-12-18 21:15:16 +01:00
parent ecedd8fd59
commit 3badd74977
1 changed files with 11 additions and 22 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

33
src/main.c
View file

@ -12,7 +12,7 @@
// Should be plenty of stack space between the top of the graphics memory
unsigned short i;
short i;
short x; // maybe if the ant does not go tooo far it could be an int..
short y;
short direction; // 0 = right, 64 = up, 128 = left, 192 = down
@ -54,33 +54,32 @@ void setAndClearHiRes(){
}
// need to think
BYTE isPositionWhite(short x, short y)
BYTE isPositionWhite(short x, BYTE y)
{
short ra = (320 * (short)(y/8)) + (y & 7);
short ba = 8 * (short)(x/8);
short ma = 1 << ((7-(x & 7)));
short ra = (320 * (BYTE)(y/8)) + (y & 7);
BYTE ba = 8 * (BYTE)(x/8);
BYTE ma = 1 << ((7-(x & 7)));
short sa = 0x2000;
short ad = sa+ra+ba;
return *(short*)(ad) & ma;
return *(BYTE*)(ad) & ma;
}
// https://archive.org/details/The_Graphics_Book_for_the_Commodore_64/page/n129/
void setPositionWhite(short x, short y)
{
short ra = (320 * (short)(y/8)) + (y & 7);
short ba = 8 * (short)(x/8);
short ma = 1 << ((7-(x & 7)));
BYTE ba = 8 * (short)(x/8);
BYTE ma = 1 << ((7-(x & 7)));
short sa = 0x2000;
short ad = sa+ra+ba;
*(short*)(ad) = *(short*)(ad) | ma;
}
void setPositionBlack(unsigned short x, unsigned short y)
void setPositionBlack(short x, short y)
{
short ra = (320 * (short)(y/8)) + (y & 7);
short ba = 8 * (short)(x/8);
short ma = (1 << ((7-(x & 7))));
BYTE ba = 8 * (short)(x/8);
BYTE ma = (1 << ((7-(x & 7))));
short sa = 0x2000;
short ad = sa+ra+ba;
*(short*)(ad) = (*(short*)(ad)) & ~ma;
@ -128,16 +127,6 @@ unsigned short j;
int main(void) {
setAndClearHiRes();
for (i = 0;i<50;i++){
for (j= 0;j<50;j++){
setPositionWhite(i,j);
}
}
for (i = 0;i<50;i++){
for (j= 0;j<50;j++){
setPositionBlack(i,j);
}
}
x = 160;
y = 100;
direction = 0;