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cmuratori's profile
Casey Muratori
Casey Muratori
Casey Muratori
@cmuratori

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Casey Muratori

@cmuratori

I'm worried that the baby thinks people can't change.

Seattle
caseymuratori.com
Joined March 2009

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    1. Casey Muratori‏ @cmuratori 16 Sep 2019

      GPU performance question: is there any way in a fragment shader (or equivalent) to if() around a multisampled texture read based on whether or not the texture actually had multiple samples at that location? For high MSAA (16x) render targets, the blending takes a long time...

      7 replies 4 retweets 9 likes
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      Casey Muratori‏ @cmuratori 16 Sep 2019

      I am thinking of something like: if(has_samples(sampler, uv)) { // blend all 16 samples } else { // just use sample 0 }

      9:41 AM - 16 Sep 2019
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      • Michael Loda
      2 replies 0 retweets 2 likes
        1. Casey Muratori‏ @cmuratori 16 Sep 2019

          It seems like this would save a lot of work on blocks of pixels that do not have an edge passing through them, since the entire warp would skip the slow path... but maybe I'm wrong.

          1 reply 0 retweets 4 likes
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        2. Catalin Balan‏ @laserbeam333 16 Sep 2019
          Replying to @cmuratori

          Wait, don't shader branches execute in lockstep on all GPU cores as fast as the slowest branch? Thus if only 1 pixel in the needs blending all the others would just stall?

          1 reply 0 retweets 0 likes
        3. Casey Muratori‏ @cmuratori 16 Sep 2019
          Replying to @laserbeam333

          Yes, but since most pixels aren't multisampled, you still have a high chance of getting all zeroes in the warp and skipping the high-cost code.

          0 replies 0 retweets 0 likes
        4. End of conversation

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