[REBOL] Re: [view] accelerating view...
From: atruter:labyrinth:au at: 16-Jan-2004 12:22
Hi Max,
I use code like the following to benchmark pre and post draw FPS:
<code>
REBOL []
img-size: 1024x768
img: to-image layout [origin 0 box img-size blue form img-size]
view/new/options center-face layout [
origin 0
i: image img img-size effect [none] ;draw [circle 100x100 100]]
; i: image img img-size effect [draw [circle 100x100 100]]
][no-title no-border]
start: now/time/precise
loop 100 [i/image: img show i]
end: now/time/precise
unview
print to-integer 100 / (to-decimal end - start)
</code>
My rough rule of thumb is that draw will halve your optimal [View] FPS
with further degredation as the draw block size increases.
I use a couple of tricks to optimize refresh rates:
1. Take a snapshot of a more complex underlying face and draw on that
2. Once the draw block gets to a certain size, perform 1) again and clear
the draw block
3. For "line-move" or "freehand draw" type operations, make the 'show
conditional on being a certain [user specified] distance from the previous
point (this allows freehand polygon drawing without "over registering" the
points)
4. Ensure your s/w is run on appropriate h/w (see next)
I use the following rough approximation to determine what the 1024x768 FPS
of a PC should be:
(GHz * Memory Speed) / 10
Sample data:
P4 3G/DDR400 (3 * 400) / 10 = 120 [actual is 102]
C3 1G/DDR266 (1 * 266) / 10 = 26 [actual of 4]
C3 1G/DDR266 (1 * 266) / 10 = 26 [actual of 16] ; post driver update
Celeron 700/33 (.7 * 33) / 10 = 2.3 [actual of 2]
AthlonXP1600 / DDR266 (1.6 * 266) / 10 = 42.5 [actual of 41]
FSB / Memory speed is just as important as CPU speed, so for graphics
intensive tasks ensure your clients don't use a Celeron / Duron! (driver
updates can also sometimes make a big difference).
Regards,
Ashley<
