DX12 Coming

[Bottle 663]

I'm pretty sure at the press event at Renton airport they stated they would eventually transition to DX12, so it's not new news. But considering everything else they need to do I wouldn't expect this any time in the next 2 years.

[Ricardo41 5,949]

DX12 will be the savior of us all, yes, sir. It's like the second coming of someone...

[Ixoye 1,821]

32 minutes ago, Espana Pete said:

Before I get my head bitten off I should state that I am technically challenged. I know I have read that MSFS only uses about 4 out of the  12 threads (or cores) of my cpu. What I cannot remember if this is due to the fact that the app does not use Direct X 12 ? So my question is, will Direct X 12 if and when it arrives, enhance the performance? 

MFSF uses all 10 cores on my CPU but four of them are more in work, yes Direct X 12 will probably enhance the performance significantly.

Edited September 26, 2020 by Ixoye

[sal9000 210]

1 hour ago, Sesquashtoo said:

Yep...I (8 GB's) probably will....under DX12, I can' run a major feature of P3D (E.A.)  over my preferred slider settings...for that takes me into Vram DX12 budget exhaustion...and I CTD.

That is the reason, I use 4,5 at the moment for IFR.

Its not the best Sim but the stressfree Sim at the Moment 😉

[sal9000 210]

1 hour ago, Sesquashtoo said:

Yep...I (8 GB's) probably will....under DX12, I can' run a major feature of P3D (E.A.)  over my preferred slider settings...for that takes me into Vram DX12 budget exhaustion...and I CTD.

That is the reason, I use 4,5 at the moment for IFR.

Its not the best Sim but the most stressfree Sim at the Moment 😉

[tweekz 2,165]

DX12 needs to be implemented well. I guess ASOBO has a bit of an advantage in that regard.

I'd be surprised if they don't already have something in the works with a team of 200 devs.

[Farlis 2,287]

Where is this news?

They always said it will come. And "in the future" means: "We do not even have an internal roadmap for this". So don't expect it to come within the next 24 months.

[Mark VII 26]

Pros devs say that a native DX12 code is one thing, DX11 ported one is another different one, where the second one is 30-40% only as efficient as the native solution.

[pstrub 998]

59 minutes ago, Farlis said:

Where is this news?

They always said it will come. And "in the future" means: "We do not even have an internal roadmap for this". So don't expect it to come within the next 24 months.

I'm torn here... In one of the interviews Jörg Neumann said VR isn't far from release (whatever that means), and I don't see them doing VR without massive performance improvements... I may be wrong here, but I reckon DX12 is needed in order to push the framerates up to ~90fps for VR.

 

[JacquesBrel 639]

For VR in flight sims, 45fps will work fine with reprojection/spacewarp making up for the missing frames. In a civillian flight sim, your surroundings are very rarely moving very fast like in action games or race sims, where a few can't tolerate reprojection.

In DCS World it's pretty much impossible to reach 90fps in VR unless you have hardware well beyond what mortal beings can attain, and even in a fast combat aircraft 45fps with reprojection is fine, unless you're flying really low really fast and are really sensitive to reprojection.

[pstrub 998]

21 minutes ago, JacquesBrel said:

For VR in flight sims, 45fps will work fine with reprojection/spacewarp making up for the missing frames. In a civillian flight sim, your surroundings are very rarely moving very fast like in action games or race sims, where a few can't tolerate reprojection.

I don't really have experience with VR yet, so just trying to wrap my head around it: reprojection means, the flightsim draws the environment at maybe 40 fps, wraps it onto a sphere (or part of it), and the effect of your head movements is updated at 90fps relative to the photosphere? 

Seems like a viable approach, as you said civil flightsim doesn't need high framerates just to update the image contents...

Edit: That would also mean DX12 isn't really necessarily coming with VR... If reprojection works well, I'm ok with the framerates MSFS reaches on modern hardware. 

 

Edited September 26, 2020 by pstrub

[JacquesBrel 639]

Asynchronous reprojection is the technical term. Oculus calls it spacewarp or timewarp. It's basically extra frames that the VR driver generates based on the preceeding frames and the direction of your head movement. A rendered frame doesn't just contain pixel colour values, but also pixel depth values, which can be used to reproject or "warp" the frame in the direction of movement, with close pixels moving more than pixels in the distance, which creates a usually pretty convicing sensation that the VR headset is running at a higher frame rate.

Edited September 26, 2020 by JacquesBrel

[pstrub 998]

29 minutes ago, JacquesBrel said:

Asynchronous reprojection is the technical term. Oculus calls it spacewarp or timewarp. It's basically extra frames that the VR driver generates based on the preceeding frames and the direction of your head movement. A rendered frame doesn't just contain pixel colour values, but also pixel depth values, which can be used to reproject or "warp" the frame in the direction of movement, with close pixels moving more than pixels in the distance, which creates a usually pretty convicing sensation that the VR headset is running at a higher frame rate.

Ahhh thanks for the explanation! Didn't think of the pixel depth values, this should actually give a pretty good approximation to full rendering! 

Edited September 26, 2020 by pstrub

[Noel 4,499]

4 hours ago, sal9000 said:

That is the reason, I use 4,5 at the moment for IFR.

Its not the best Sim but the most stressfree Sim at the Moment 😉

I don't get this--I do ONLY IFR flights in MSFS and all is well!

[mtaxp 666]

5 hours ago, Ixoye said:

MFSF uses all 10 cores on my CPU but four of them are more in work, yes Direct X 12 will probably enhance the performance significantly.

Usage of multiple cores does not account for a rendering engine that's able to send draw calls to gpu from multiple cores.

Multiple cores can be used for other stuff other than draw/render calls, like simulating systems and avionics, simulating the flight model and overall real time simulation we have in flight simulation that has none to do with graphics.

Dx12 and other low overhead api are safe in the regard of rendering in a threaded envirnment, unlike dx11, it's more about getting the cpu overhead out of the way so the gpu can work it's charm. 

Not an easy task, assuming MS would want to do as it should be done rather than low quality port, this may result on the need to re write many parts of the rendering engine and pipeline, as many of the stuff used to be done by the driver are now required to be done by apps = more work for the developers, but much more control, predictable and straight forward fps fixing.

Addons may break too.

Edited September 26, 2020 by mtaxp