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@SebAaltonen Helper lanes still need to participate, otherwise they wouldn't be useful for comparing against neighbors.
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@matiasgoldberg Another discussion of this, Linux locks have long since been unfair. blog.mozilla.org/nfroyd/2017/03…
Richard Schreyer retweeted
In which I explain why, as a graphics programmer, the white furnace test is one of my favourite debugging tools: lousodrome.net/blog/light/202…
@thesolidpixel Long thin diagonal triangles are also horrible for ray tracing, and non-binning rasterizers.
@r3d_3v1l @SebAaltonen @SebAaltonen To clarify: the Metal System Trace in instruments reports actual timings from your live app. Xcode frame profiler is capture/replay based. You get a bit less data from the live tracing, but also avoids any error that comes from capture/replay process.
@matiasgoldberg Not required. If you're sticking with the 'classic' binding model (not using heaps, not using ArgBuffers, ie the driver can look at the top-level bindings and know what memory you're accessing) you can ignore barriers entirely.
@SebAaltonen If there is no math between the return of the float4 value and conversion to half4, the Metal compiler will optimize that and return half4.
@SebAaltonen @gavkar @matiasgoldberg Yes, they should. Mac/apple silicon advertises support for both the mac2 and iOS feature sets. It is a superset.
@SebAaltonen Something is amiss, as it should break at the point of the error. Have you double checked the validation layer is actually loaded? The console output should print "Metal API Validation Enabled"
Richard Schreyer retweeted
The acid test for any two competing socioeconomic systems is which side needs to build a wall to keep people from escaping? That’s the bad one!
Not that I ever tweet anything, but I'm now generally over on @[email protected]
Richard Schreyer retweeted
⚛️📋 I made an overview of the ARMv8 and x86-64 machine instructions for all the common atomic operations:
@jekstrand_ @MyNameIsMJP Look up the depth buffer back at eidosmontreal.com/news/deferred-… or the Nanite siggraph presentation. In my experience, it works really well. It doesn’t save on unique PSOs, but at least it gets the right threads launched
Richard Schreyer retweeted
@hishnash @SebAaltonen The opt-out is specifically a CommandBuffer retaining a texture until the command buffer completes execution. (because that happens so often). All other retain/release cases follow ObjC/Swift conventions, with no opt-out.
@SebAaltonen It ref counts. You can release the original.
@h3r2tic What are you doing for direct lighting? Sun only?
@SebAaltonen On iOS, mach_absolute_time is the clock you want.
Richard Schreyer retweeted
Hey you! Do you like visibility buffers? Compute shaders? Want to fill your G-buffer while rasterizing your shadows? Then come along to GDC and hear me talk about the deferred texturing system we use to accelerate our foliage in Horizon Forbidden West :-) shorturl.at/gmtwG
@FilmicWorlds When evaluating if a coverage sample has matching neighbors, are you using the whole Visibility ID, or just the Draw Call ID?
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