Page 2 of 2
Re: Stuck on PPU Implementation
Posted: Thu Apr 09, 2015 9:59 am
by tokumaru
Yeah, my confusion came from the fact that the diagram implies that scanline 0 is the first, but the
page where the diagram is starts the description from the pre-render scanline.
I'd also suggest going by the counters actually used by the PPU (since we now know them), since it makes it easier to compare the implementation to that diagram and Visual 2C02.
Care to refresh my memory?
Re: Stuck on PPU Implementation
Posted: Thu Apr 09, 2015 11:28 am
by thefox
tokumaru wrote:I'd also suggest going by the counters actually used by the PPU (since we now know them), since it makes it easier to compare the implementation to that diagram and Visual 2C02.
Care to refresh my memory?
Hmm? The counters used by the PPU are exactly the ones used in that diagram. I.e. (0, 0) is the first pixel of the 256x240 view area. (240, x) is the post-render line and (261, x) is the pre-render ilne.
Re: Stuck on PPU Implementation
Posted: Thu Apr 09, 2015 11:34 am
by tokumaru
thefox wrote:The counters used by the PPU are exactly the ones used in that diagram.
Oh, OK.
