Switch the offscreen target from Bgra8UnormSrgb to Rgba16Float for HDR
headroom (disk brightness can exceed 1.0 without clamping). Set offscreen
camera order to -20 (the bloom pipeline, added next, needs cameras ordered
so offscreen renders first). Introduce three marker components:
- Nudgable: all render cameras carry it; nudge_camera now queries this
instead of a hardcoded Or<(OffscreenCamera, UpscaleCamera)>.
- QuadScaleFactor(fx, fy): fraction of offscreen res each quad fills;
resize_offscreen rescales each quad independently via this.
- CompositeQuad: the final quad renders to the window (rescaled against
window res, not offscreen).
The upscale path still works (textureSample reads float textures);
ACES tone-mapping is added in a later commit.
xfy
d7fdef541e