sceDisplayGetFramePerSec

Cpasjuste · Post by **Cpasjuste** » Tue Oct 16, 2007 7:40 am

Does someone know how to use this function correctly ? I can't find any help on it.

SilverSpring · Post by **SilverSpring** » Tue Oct 16, 2007 8:35 am

What do you mean correctly? It just returns a float (which it just gets from the vsync freq):

float sceDisplayGetFramePerSec&#40;&#41;
&#123;
	return&#40;sceLcdcGetVsyncFreq&#40;&#41;&#41;;	
&#125;

Art · Post by **Art** » Tue Oct 16, 2007 1:19 pm

Wouldn't that always be 60 as long as the clock speed wasn't changed?

Cpasjuste · Post by **Cpasjuste** » Tue Oct 16, 2007 7:03 pm

Yes it seems that it always return the same value even with changing the cpu speed, it's why i was asking :/

Art · Post by **Art** » Tue Oct 16, 2007 8:55 pm

I wonder if you could calculate it then?

vsync freq = CPU clock divided by 3.7

SilverSpring · Post by **SilverSpring** » Tue Oct 16, 2007 11:46 pm

How to calculate what, vsync freq?

(pixel_clk_freq * cycles_per_pixel)/(row_pixels * column_pixel) ==
(9MHz * 1)/(525 * 286) ==
59.9400599........ etc. etc. Hz

Cpasjuste · Post by **Cpasjuste** » Tue Oct 16, 2007 11:51 pm

In fact this is not very usefull, the goal would be to calculate the frame per seconds we get under any aplications or under the vsh for exemple.

SilverSpring · Post by **SilverSpring** » Wed Oct 17, 2007 12:13 am

Yea the name is misleading (sceDisplayGetFramePerSec). Its because of the devkit external displays (which would return different values - depending on the type of display used. The devkit supports many different displays).

Cpasjuste · Post by **Cpasjuste** » Wed Oct 17, 2007 12:15 am

Ok, it's more clear now. I will look in another direction, maybe sceDisplayGetVcount would do the trick, but i dont think it will count external vblank ... i need to spent more time on this.
Thanks for your answers !