[Bug] No transparency

[jmortiger]

Describe the bug

Translucent polygons (e.g. Ghosts) are fully transparent, w/ only their opaque eyes being visible.

To Reproduce

Steps to reproduce the behavior:
Get to the sitting room w/ the gramophone.
Look at the lamp at the start of AITD1.

Expected behavior

Them to appear correctly

Screenshots

Platform(s)

• OS: Linux

[jmortiger]

Still need to correctly blend, but largely resolved.