[Feature]: Support Ascii1457's screen space shaders

[yohjimane]

Credits: Ascii1457, LVutner, Anomaly Team

Bootable, but still WIP, needs additional engine code ported from anomaly

Features to verify:

• Ambient occlusion
• Screen space shadows
• Screen space reflections
• Water reflections
• Rain puddles
• Depth of field
• Indirect Light
• Additional shadow features
• Interactive grass
• Shadow fixes
• Skybox debanding
• Flora fixes and improvements
• Fog
• Volumetric sun ray fixes

[yohjimane]

All shaders are now loading properly (or at least not crashing!)

The only shader that does not work currently is the DoF shader. This depends on a script, which depends on some more functionality to be ported form anomaly (mainly, missing script callbacks)

As of now, this is feature complete and ready for review.

[CasualDev242]

I've tested this, works great for the most part. Two questions if you don't mind:

1. Are you sure Indirect Illumination is working? I've tried cranking up values (after deleting shader cache), and even enabling debug mode, and don't notice any difference.
2. Is interactive grass supposed to be functional yet, or require further implementation? The grass isn't moving upon collision.

[yohjimane]

Hey @CasualDev242

1. I will need to test this further.

2. Interactive grass can be configured as such:
   ssfx_grass_interactive = player collision enable (0-1), max collisions (0-15), max distance (0-5000), mutant collision enable (0-1)

e.g. some good default values
ssfx_grass_interactive = 1,15,3000,1

Edit: on further testing, i found enabling ssfx_grass_interactive while in-game can cause a hang. As a bandaid, the default values of ssfx_grass_interactive have changed to:
0,0,2000,1 -> 1,8,2000,1

[yohjimane]

Hey @CasualDev242, thanks for calling out IL - i checked by uncommenting G_IL_DEBUG_MODE in shaders, and didn't see any difference.

On anomaly, I did the same thing and also didn't see any difference, so maybe that debug mode doesn't work properly. I reached out to Ascii to ask how to validate indirect lighting, hopefully will hear back soon!

[yohjimane]

@CasualDev242 Hey, indirect lighting and dof are now working with the latest changes. Dof support is basic and not dynamic yet.

We are splitting up the gamedata and engine changes into separate merges to capture some new scope, and for easier review, so i will be closing this merge.

Superseded by both: #1406 #1407