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DXT5 RGBM encoding support #361

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walbourn opened this issue Jun 9, 2023 · 0 comments
Open

DXT5 RGBM encoding support #361

walbourn opened this issue Jun 9, 2023 · 0 comments
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enhancement

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@walbourn
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walbourn commented Jun 9, 2023 •
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As a way to save memory with lightmaps, a variant of DXT5/BC3 uses RGBM instead of RGBA to encode HDR content.

http://www.ludicon.com/castano/blog/2016/09/lightmap-compression-in-the-witness/

In a shader it would be reconstructed as:

float4 data = Texture.Sample(sampler, uv);
data.rgb = data.rgb * data.a * 5.0;
data.a = 1.0;
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