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warrenm's profile
Warren Moore
Warren Moore
Warren Moore
@warrenm

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Warren Moore

@warrenm

Software engineer specializing in mobile graphics and augmented reality. Author of “Metal by Example”

San Francisco, CA
metalbyexample.com
Joined April 2008

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    1. Serhii Rieznik‏ @serhii_rieznik Jul 13

      Is there any simple way to load floating point image (HDR or EXR) in Metal?

      1 reply 0 retweets 0 likes
    2. Warren Moore‏ @warrenm Jul 13
      Replying to @serhii_rieznik

      ImageIO supports both AFAIK, so you could CGImageSource->CGImage->CGDataProvider->CFData->replaceRegion

      1 reply 0 retweets 1 like
    3. Chris W‏ @_psonice Jul 13
      Replying to @warrenm @serhii_rieznik

      I have some code for this, will see what I did when I’m back at my desk.

      1 reply 0 retweets 1 like
    4. Warren Moore‏ @warrenm Jul 13
      Replying to @_psonice @serhii_rieznik

      This is how I did it in GLTFKit (there’s a little vImage magic in the middle to massage all HDR images into RGBA16Float):https://github.com/warrenm/GLTFKit/blob/master/Framework/GLTFMTL/Source/GLTFMTLTextureLoader.m#L167 …

      1 reply 0 retweets 4 likes
    5. Serhii Rieznik‏ @serhii_rieznik Jul 14
      Replying to @warrenm @_psonice

      Thank you! I will check it. Yesterday I ended up using OpenEXR, which is not quite what I was looking for (I supposed to use no external libs).

      1 reply 0 retweets 0 likes
    6. Chris W‏ @_psonice Jul 14
      Replying to @serhii_rieznik @warrenm

      Warren’s setup is a lot cleaner than mine which loads the image as NSImage, then gets CGImage and creates the texture from that. (Better in my case as I need to show the texture in the UI too, so I need the NSImage.)

      1 reply 0 retweets 0 likes
    7. Serhii Rieznik‏ @serhii_rieznik Jul 14
      Replying to @_psonice @warrenm

      All my experiments with loading using NSImage ended up with something like “Unable to decode” (not remember exactly). I will check your code later today, maybe I was doing something wrong

      1 reply 0 retweets 0 likes
    8. Chris W‏ @_psonice Jul 14
      Replying to @serhii_rieznik @warrenm

      Yeah, I seem to do some “draw cgimage into context” intermediate step to get around that. Will post the code up.

      2 replies 0 retweets 0 likes
      Warren Moore‏ @warrenm Jul 14
      Replying to @_psonice @serhii_rieznik

      I’ve seen similar, at least with MTKTextureLoader. Part of the reason I wrote my own.

      12:53 AM - 14 Jul 2018
      • 2 Likes
      • Chris W Serhii Rieznik
      0 replies 0 retweets 2 likes

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