Low-end devices optimizations

[Flakky (Alexander Blintsov)]

@MoHoe;680061

thanks for sharing the link. Jack is there to help you with this issue. looking forward to seeing this issue fixed before I use unreal to develop mobile games.

Yeah, I’ll answer him soon. Just Galaxy S3 is not available for me to test now…

[Flakky (Alexander Blintsov)]

It appears, that my problem with Mali devices appears because of Unreal smooth frame rate.

Very low FPS on Mali devices

It appears that problem is about Frame smoothing.

Disabling “Smooth Frame Rate” option in Project Settings > General Settings and set “Use Fixed Framerate” to 60, Mali400 (Tested on Galaxy S3 and Galaxy Ace2) will render the game with 60 fps

[Flakky (Alexander Blintsov)]

Looks like I was wrong. My testers was reporting 60 fps with Fixed framerate not because of real 60 frames per sec, but because my counter was showing so…

I draw FPS on HUD by using 1 / Delta World Seconds. Looks like when you set fixed framerate, GetDeltaWorldSeconds() returns fixed delta of the frame, even if fps is different. That’s why testers told me they had 60 fps.

They also told me that game became smoother, but slower (like slow motion). As soon as was able to get Galaxy S3 personally, I convinced that game actually gave me only 20 fps. So the problem with mali is not solved.

[LZDLY]

@Flakky

In my opinion, geometry render and shaders are too heavy for low-end mobile. In my game I do not have any lighting, any complex shaders (all unlit), there are no textures.

As you can see on screenshots, I do not have anything… Like 40k polys and unlit shading, that is all… But I get 20 fps. So it must be a polycount or shader bottleneck.

I have noticed, that pure unlit shader without any material logic gives me like 20 instructions… In real shader it should be like 1 instruction for return a flat color.
just

return float3(1.0,1.0,1.0);

There is somthing unreal adds to shaders. We all know about PBR, but unlit is just a color, there should be no heavy stuff. I’m trying to get deeper in unreal shader code to see, what they done there. Maybe if i’m lucky to remove those instructions, I could get a boost to game performance.

So you have a result now, i also doult about this