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optimizing

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Bjorn Einar Bjarntes 2021-12-19 14:13:43 +01:00
parent 5e9d2fdecc
commit 8bea2e8121
1 changed files with 5 additions and 4 deletions
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9
src/main.c
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@ -30,19 +30,19 @@ void setAndClearHiRes(){
} }
BYTE isPositionWhite() { BYTE isPositionWhite() {
ad = 0x2000+(320 * (BYTE)(y >> 3)) + (y & 7)+ (x&(0xfff8)); ad = 0x2000+(40*(y >> 3)<<3) + (y & 7)+ (x&(0xfff8));
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() {
// 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)+(x&(0xfff8)); ad = 0x2000+(40 * (y >> 3) << 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)+ (x&(0xfff8)); ad = 0x2000+ (40* (y >> 3) << 3) + (y & 7)+ (x&(0xfff8));
*(short*)(ad) = (*(short*)(ad)) & ~(1 << ((7-(x & 7)))); *(short*)(ad) = (*(short*)(ad)) & ~(1 << ((7-(x & 7))));
} }
@ -77,7 +77,8 @@ int main(void) {
x = 270; x = 270;
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)
while(1)
{ {
makeMove(); makeMove();
} }