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feat(ugc): icons as DXT5 DDS like the client's own

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The client's 128x128 UI icons are almost all DXT5 without mipmaps, with
header flags caps|height|width|pixel format|linear size (0x81007) and
caps 0x1000. The UGC server's icon.dds is now written the same way
instead of as uncompressed 32-bit BGRA with a pitch.

The BC3 encoder fits each block's colour endpoints along the principal
axis of its visible pixels (transparent ones are never seen), refines
them by least squares, and stores alpha with the block's own range.
Tests check the header against the client's format and decode the
result back.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Aaron Kimbrell
2026-09-27 18:13:25 -05:00
parent 79235702b3
commit 1d72766330
4 changed files with 252 additions and 21 deletions
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docs/UgcServer.md
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@@ -136,7 +136,8 @@ defaults. The table below goes through it step by step.
light, a fill from the camera, the sun with soft shadows, a highlight, exposure and contrast) is set so the icons are
as bright as the game's own model icons (`res/textures/ui/inventory/models`: mean luminance 120 of 255 over 150 of
them; ours 118 on a set of player models). Drawn by a software rasterizer (no GPU, no display), 4x4 supersampled,
on a transparent background: `icon.png` for the dashboard and a 32-bit `icon.dds` for the client.
on a transparent background: `icon.png` for the dashboard and an `icon.dds` for the client, written like
the client's own 128x128 icons (DXT5, no mipmaps, header flags 0x81007 with the linear size, caps 0x1000).
The light settings are `icon_world_light`, `icon_sun_light`, `icon_fill`, `icon_specular`, `icon_shininess`,
`icon_exposure`, `icon_contrast`, `icon_shadow_strength` and `icon_ao_strength` (new names: the older