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do not divide

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Bjorn Einar Bjarntes 2021-12-19 13:12:33 +01:00
parent 179a722414
commit 985a228bac
1 changed files with 3 additions and 3 deletions
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6
src/main.c
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@ -30,18 +30,18 @@ void setAndClearHiRes(){
} }
BYTE isPositionWhite() { BYTE isPositionWhite() {
ad = 0x2000+(320 * (BYTE)(y/8)) + (y & 7)+8 * (BYTE)(x/8); ad = 0x2000+(320 * (BYTE)(y >> 3)) + (y & 7)+8 * (BYTE)(x/8);
return *(short*)(ad) & 1 << ((7-(x & 7))); return *(short*)(ad) & 1 << ((7-(x & 7)));
} }
// https://archive.org/details/The_Graphics_Book_for_the_Commodore_64/page/n129/ // https://archive.org/details/The_Graphics_Book_for_the_Commodore_64/page/n129/
void setPositionWhite() { void setPositionWhite() {
ad = 0x2000+(320 * (y/8)) + (y & 7)+8 * (x/8); ad = 0x2000+(320 * (y >> 3)) + (y & 7)+8 * (x/8);
*(short*)(ad) = *(short*)(ad) | 1 << ((7-(x & 7))); *(short*)(ad) = *(short*)(ad) | 1 << ((7-(x & 7)));
} }
void setPositionBlack() { void setPositionBlack() {
ad = 0x2000+320 * (y/8) + (y & 7)+8 * (x/8); ad = 0x2000+320 * (y >> 3) + (y & 7)+8 * (x/8);
*(short*)(ad) = (*(short*)(ad)) & ~(1 << ((7-(x & 7)))); *(short*)(ad) = (*(short*)(ad)) & ~(1 << ((7-(x & 7))));
} }