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Switch to 16-bit truecolor framebuffer and PNG assets

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pbio moves to git.bnd.wtf/irrlicht/pbio.git branch truecolor16: the
framebuffer is now RGB565 u16, no palette. Assets are loaded from PNG via
the png crate and quantized to RGB565 on load; transparency comes from the
alpha channel as a per-tile opacity mask, so any color (black included) can
be opaque. The TGA loader and the palette-order fragility are gone.

overworld.png is the unmodified Mini-Medieval Overworld sheet (same 24-column
layout as the old TGA, so map tile ids are unchanged); entities.png holds the
player sprite extracted from the old entities.tga.

Adds an ignored snapshot test that renders the first frame headlessly to a
PNG for eyeballing the renderer without a window.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
This commit is contained in:
irrlicht
2026-09-18 23:17:41 +02:00
co-authored by Claude Opus 5
parent 64a6e1d42d
commit 5a055c048d
14 changed files with 212 additions and 96 deletions
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notes/07-map-loader.md
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@@ -48,10 +48,10 @@ Tile ids are used directly:
- **Sim** — `tile_flags(id)` (in `map.rs`) maps an id to gameplay `TileFlags`
(collidable / opaque) via the `sim::tile_collidable` vocabulary. Hand-maintained; test values only.
- **Renderer** — the id indexes straight into `overworld.tga` (`game.rs`). The tileset's tile
order *is* the id space; keep the Tiled tileset and `overworld.tga` in lockstep.
- **Renderer** — the id indexes straight into `overworld.png` (`game.rs`). The tileset's tile
order *is* the id space; keep the Tiled tileset and `overworld.png` in lockstep.
No `firstgid` subtraction: the authored ids already line up with `overworld.tga`.
No `firstgid` subtraction: the authored ids already line up with `overworld.png`.
---