empathicqubit/langtoncant
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more optimization

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This commit is contained in:
Bjorn Einar Bjarntes 2021-12-19 13:29:54 +01:00
parent 985a228bac
commit f913d0ff65
3 changed files with 6 additions and 5 deletions
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1
.gitignore vendored
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@ -10,6 +10,7 @@ disk/
*.o
*.pet
*.avi
*.prg
*.d81
*.c64

4
.vscode/tasks.json vendored
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@ -17,9 +17,9 @@
"command": " x64sc.exe out/program.c64"
},
{
"label": "Build & run program",
"label": "Build & run program with optimization",
"type": "shell",
"command": "cl65 src/main.c -o out/program.c64 && x64sc.exe out/program.c64",
"command": "cl65 src/main.c -o out/program.c64 -Oi && x64sc.exe out/program.c64",
"problemMatcher": []
}
]

6
src/main.c
View file

@ -30,18 +30,18 @@ void setAndClearHiRes(){
}
BYTE isPositionWhite() {
ad = 0x2000+(320 * (BYTE)(y >> 3)) + (y & 7)+8 * (BYTE)(x/8);
ad = 0x2000+(320 * (BYTE)(y >> 3)) + (y & 7)+8 * (BYTE)(x>>3);
return *(short*)(ad) & 1 << ((7-(x & 7)));
}
// https://archive.org/details/The_Graphics_Book_for_the_Commodore_64/page/n129/
void setPositionWhite() {
ad = 0x2000+(320 * (y >> 3)) + (y & 7)+8 * (x/8);
ad = 0x2000+(320 * (y >> 3)) + (y & 7)+8 * (x>>3);
*(short*)(ad) = *(short*)(ad) | 1 << ((7-(x & 7)));
}
void setPositionBlack() {
ad = 0x2000+320 * (y >> 3) + (y & 7)+8 * (x/8);
ad = 0x2000+320 * (y >> 3) + (y & 7)+8 * (x>>3);
*(short*)(ad) = (*(short*)(ad)) & ~(1 << ((7-(x & 7))));
}