empathicqubit/langtoncant
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

commented the rewrite a bit

Browse source
This commit is contained in:
Bjorn Einar Bjarntes 2021-12-19 19:58:35 +01:00
parent 151b969c7c
commit b783dc268f
1 changed files with 4 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
src/main.c
View file

@ -31,6 +31,10 @@ void setAndClearHiRes(){
} }
void calcAdress(){ void calcAdress(){
/// Refactored it a bit, it had stuff like 320*FLOOR(Y/8) which is made into
/// 40*8*FLOOR(Y/8) which is the same as (32+8)* (Y and remove last three bits)
/// which ends up being (4+1)*Y_with_three bits removed
/// which is split into a temp variable... and summed in the last line
tmpY = (y & 0xf8) << 3; tmpY = (y & 0xf8) << 3;
ad = 0x2000+tmpY + (tmpY << 2) + (y & 7)+ (x&(0xfff8)); ad = 0x2000+tmpY + (tmpY << 2) + (y & 7)+ (x&(0xfff8));
} }