Re: [B2-devel] SheepShaver and SDL

[Gwenole B. <gb...@di...>]

Hi,

> Even though SheepShaver results were noticeably higher
> in most tests, including QuickDraw ones, SheepShaver's graphics feels=20=

> a lot
> slower than Basilisk's - repainting of Finder windows is visible, =
menus
> don't appear instantly and stuff like this.

I did notice that too but I don't think it's caused by the graphics=20
subsystem. e.g. I ran extra MacBench 5.0 graphics test CopyBits=20
(srcCopy) and performance was really good. Last time I tried to=20
investigate that, reasons why Finder windows repainting it slow might=20
be:
- a non neglectable portion is 68k code
- the code uses a lot of branches that are not translated effeciently=20
yet
- cache is invalidated a lot of times. I noticed that when pulling down=20=

a single menu, at least 3 cache invalidation occur for specific regions.

I hoped NQD acceleration would help, but it didn't.

> The difference increased when I
> installed Kaleidoscope theming applet and Aqua-like themes on both=20
> systems.

Is Kaleidoscope native PPC nowadays? If not, we really must find a=20
decent way to translate 68k code to native code too. Problem is Apple's=20=

special opcodes, and checkpoints for interrupt handling. That can be=20
workarounded but not effeciently. Well, I will try to look at it again.

Bye,
Gwenol=E9.=