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trying to speed things up a bit

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This commit is contained in:
Bjorn Einar Bjarntes 2021-12-18 21:29:49 +01:00
parent 431572f223
commit 4adaa74550
1 changed files with 6 additions and 22 deletions
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28
src/main.c
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@ -4,10 +4,6 @@ short i;
short x; short x;
BYTE y; BYTE y;
BYTE direction; BYTE direction;
short ra;
BYTE ba;
BYTE ma;
short sa;
short ad; short ad;
void setHiRes() { void setHiRes() {
@ -33,31 +29,19 @@ void setAndClearHiRes(){
} }
BYTE isPositionWhite() { BYTE isPositionWhite() {
ra = (320 * (BYTE)(y/8)) + (y & 7); ad = 0x2000+(320 * (BYTE)(y/8)) + (y & 7)+8 * (BYTE)(x/8);
ba = 8 * (BYTE)(x/8); return *(BYTE*)(ad) & 1 << ((7-(x & 7)));
ma = 1 << ((7-(x & 7)));
sa = 0x2000;
ad = sa+ra+ba;
return *(BYTE*)(ad) & ma;
} }
// 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() {
ra = (320 * (y/8)) + (y & 7); ad = 0x2000+(320 * (y/8)) + (y & 7)+8 * (short)(x/8);
ba = 8 * (short)(x/8); *(short*)(ad) = *(short*)(ad) | 1 << ((7-(x & 7)));
ma = 1 << ((7-(x & 7)));
sa = 0x2000;
ad = sa+ra+ba;
*(short*)(ad) = *(short*)(ad) | ma;
} }
void setPositionBlack() { void setPositionBlack() {
ra = 320 * (y/8) + (y & 7); ad = 0x2000+320 * (y/8) + (y & 7)+8 * (short)(x/8);
ba = 8 * (short)(x/8); *(short*)(ad) = (*(short*)(ad)) & ~(1 << ((7-(x & 7))));
ma = (1 << ((7-(x & 7))));
sa = 0x2000;
ad = sa+ra+ba;
*(short*)(ad) = (*(short*)(ad)) & ~ma;
} }
void moveForward() { void moveForward() {