assembler routine dline

[pachic]

Hi, I dont like xor logic when 2 or more object merge in the screen
I checked that print routine and I dont know if somebody check it
maybe we can create an sprite that stay always in front using last event or something
somebody check this theme?
I test changing xor by or and creating a new routing for print and another for delete but the resutl is not good


; Line drawn, now work out next target address.



dline ld a,(de) ; graphic data.

and c ; mask away what's not needed.

xor (hl) ; XOR with what's there.

ld (hl),a ; bung it in.

inc l ; next screen address.

inc l ; next screen address.

ld a,(de) ; fetch data.

and b ; mask away unwanted bits.

xor (hl) ; XOR with what's there.

ld (hl),a ; bung it in.

inc de ; next graphic.

dec l ; one character cell to the left.

ld a,(de) ; second bit of data.

xor (hl) ; XOR with what's there.

ld (hl),a ; bung it in.

inc de ; point to next line of data.

dec l ; another char left.

[pachic]

Ok, understood the "and B" and "and C" is for delete the shift sprite and only show the sprite move
our sprite move every 2 bits each animation, and mix with the background, with the XOR, its complicated create mask

[pachic]

Ok, It´s complicated put mask because
1 use a lot of memory
2 have to change a lot of the engine
3 lose performance

Then Iam modifying the engine for my new and free game PAC - HIC REHAB