AMD FSR is the building block for Apple's hybrid MetalFX upscaling tech | Hacker News Reader

AMD FSR is the building block for Apple's hybrid MetalFX upscaling tech

tomshardware.com

44 pointsCharlesW11 comments

After turning FSR on and off in Talos Principle 2, I think this upscaling thing is not as bad as I expected, though lag is a bit of an issue.

I wonder if dedicating more transistors (not fixed function) to the task could improve the issue, and if so, why aren't AMD and Nvidia doing it. As I understand it, the latency issue is not better with leather jacket cards

Upscaling shouldn't add appreciable latency and might even reduce latency because the frame rate is higher. Frame generation (which is not what the article is about) necessarily adds latency which is why people recommend only enabling it at high frame rates.

>might even reduce latency because the frame rate is higher

Higher FPS doesn't automatically mean lower latency.

You can have high FPS but higher latency too.

sli and crossfire. Double the cost and higher fps for equal or negative latency gains.

at least in talos 2 and highest quality fsr, 120 fps feels like 70, maybe 80.

There's something else going on then such as your settings or that particular game. FSR2 and DLSS work within the same frame cycle after the frame has been rendered (much faster at a lower resolution). So latency is the same at the same FPS, and latency is lower at higher FPS, all other things equal.

I think your conclusion could only make sense with vsync on. Otherwise, doing something could only be slower than not doing something.

You're oversimplifying things to the point of being willfully ignorant. Yes, of course "doing something" could only be slower than "not doing something". But we're talking about 2 somethings involved in generating individual frames. 1) Generating a big slow frame or a small fast frame. And 2) Not doing upscaling or doing upscaling.

Generating a small fast frame + upscaling CAN be faster than generating a large slow frame without upscaling, so it is possible to get the same perceptual visual quality at a higher FPS.

Again, this is an intra-frame operation. Latency is introduced independently of frame generation rate by frames being queued or delayed in the pipeline. For example, the new DLSS 3 frame generation feature needs 2 complete frames to generate the one in between, so the first one is queued, and the remaining 2 are delayed.

Delays in processing inputs can also be a big factor in latency.

Since vsync happens outside of individual frame generation, having it on or off doesn't matter for our argument.

I found plenty of results in Google demonstrating that upscaling doesn't affect latency, or at least not enough to be perceived by a human.

How does the licensing work here? Does Apple need to pay AMD anything or submit their contributions back to the FSR codebase?

The license is here: https://github.com/GPUOpen-Effects/FidelityFX-FSR2/blob/mast...

Seems to be a bog-standard permissive license.

genuinely, honestly, confused by the examples in the article: the upscaling looks downscaled other than in the lead image, things get blurrier and lose detail.

they will use it to proto and then dump.

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