Feature: Multiple rotating views on title screen

[nielsmh]

Motivation / Problem

The title screen is boring when it's just the same thing showing all the time!

Also, being able to show off more of a large built-up map can be a good teaching opportunity for new players.

Description

Add a sign command language to describe how to cycle different views while on the main menu.

Limitations

The "pan" and "follow vehicle" cause constant full screen updates, might be painful for slow machines.

Wishlist item: Split screen into two/four separate viewports that show different views.

Checklist for review

Some things are not automated, and forgotten often. This list is a reminder for the reviewers.

• The bug fix is important enough to be backported? (label: 'backport requested')
• This PR affects the save game format? (label 'savegame upgrade')
• This PR affects the GS/AI API? (label 'needs review: Script API')
  • ai_changelog.hpp, gs_changelog.hpp need updating.
  • The compatibility wrappers (compat_*.nut) need updating.
• This PR affects the NewGRF API? (label 'needs review: NewGRF')
  • newgrf_debug_data.h may need updating.
  • PR must be added to API tracker

[LordAro]

Would be good to have a small doc file documenting the sign format too

Code could generally do with some doxymentation as well.

[TrueBrain]

Just to make sure we don't forget: the suggestion made on IRC: why don't we do this via a GameScript, which we ship with the titlegame?

https://irclogs.thegrebs.com/openttd/2021/09/02#16:37 for more context

[nielsmh]

Here's my own test for the features:
opntitle.zip

This will probably need a little bit of cleanup before potential merge. (Even if the "GS titlegame animation" is implemented, it would still need a fix for the logo disappearing when panning the screen.)

[nielsmh]

I have written a GS to help make these signs. RIght now only available here: https://github.com/nielsmh/IntroGameTool

(This comment was edited, before it had an attachment of a very early version of the GS.)

[TrueBrain]

Really cool. Can't wait to see what people do with this.

[TrueBrain]

A week and no other review/comments, guess everyone agrees with this. Lets go!