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optimizing

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Bjorn Einar Bjarntes 2021-12-19 13:43:08 +01:00
parent 200e77c6dc
commit d4bfae1bcc
1 changed files with 3 additions and 3 deletions
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6
src/main.c
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@ -37,12 +37,12 @@ BYTE isPositionWhite() {
// 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() {
// TODO this 8 times something divided must be just masking // TODO this 8 times something divided must be just masking
ad = 0x2000+(320 * (y >> 3)) + (y & 7)+8 * (x>>3); ad = 0x2000+(320 * (y >> 3)) + (y & 7)+(x&(0xfff8));
*(short*)(ad) = *(short*)(ad) | 1 << ((7-(x & 7))); *(short*)(ad) = *(short*)(ad) | 1 << ((7-(x & 7)));
} }
void setPositionBlack() { void setPositionBlack() {
ad = 0x2000+320 * (y >> 3) + (y & 7)+8 * (x>>3); ad = 0x2000+320 * (y >> 3) + (y & 7)+ (x&(0xfff8));
*(short*)(ad) = (*(short*)(ad)) & ~(1 << ((7-(x & 7)))); *(short*)(ad) = (*(short*)(ad)) & ~(1 << ((7-(x & 7))));
} }
@ -74,7 +74,7 @@ int main(void) {
printf("Please wait for ant ...\n"); printf("Please wait for ant ...\n");
for (i = 0;i<12;i++) { printf("\n"); } for (i = 0;i<12;i++) { printf("\n"); }
setAndClearHiRes(); setAndClearHiRes();
x = 160; x = 300;
y = 100; y = 100;
direction = 0; direction = 0;
while(x > 0 && x < 320 && y > 0 && y < 200) while(x > 0 && x < 320 && y > 0 && y < 200)