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148 points ibobev | 1 comments | 06 Sep 25 20:37 UTC | HN request time: 0.2s | source

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smallstepforman ◴[07 Sep 25 06:24 UTC] No.45155865[source]▶

I’ve been using bc7 since 2012, and even have a video codec using bc7 keyframes (we needed alpha videos, even have a patent for it). Our emphasis is not file size, but playback speed. Bc7 renders 20-40% faster than raw rgba32, and we overlay 5-7 videos on screen simultanously, so every boost helps.

We also have custom encoders for the custom video format.

replies(3): >>45156041 #>>45156200 #>>45159790 #

1. chmod775 ◴[07 Sep 25 16:45 UTC] No.45159790[source]▶

>>45155865 #

HAP is a family of codecs for GPU accelerated decoding. HAP R uses BC7 frames.

There's support for various HAP codecs in ffmpeg, VLC, etc, but I think support for HAP R is lacking. However HAP, HAP Alpha, HAP Q and HAP Q Alpha have wide support. They use DXT1/DXT3/DXT5/RGTC afaik.

Compared to your implementation, their addition of BC7 is quite recent, yet they did have support for alpha channels for probably a decade.

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Shipping textures as PNGs is suboptimal