2-tile vertical scroll

bioloid · Post by **bioloid** » Sun Aug 17, 2014 12:02 pm

Hello,

I'm trying to use the 2-tile vertical scroll mode, is there a fast way to write those ? I want to set different values per line in the HIntCallback.

Alex

bioloid · Post by **bioloid** » Sun Aug 17, 2014 12:15 pm

Oh, and my callback is this now :

Code: Select all

    void hblank()
    {
        *pl = addr;
    
        int i = width;
        while(i--) *pw = *scanline++;
    }

Unfortunately it's too slow (works only when width = 2).
(sent Steph a PM as well).

Stef · Post by **Stef** » Sun Aug 17, 2014 7:07 pm

As i replied you by email, you definitely can't update the whole VSRAM during hblank, far from it actually ! maybe 5 or 6 entries at max with asm optimized code.

bioloid · Post by **bioloid** » Sun Aug 17, 2014 7:13 pm

Got it, thanks again!