sfall: SpeedPatch, LoadGameHook (LoopFlag)

[Janiczek]

What?

This PR adds support ✅ for a subset of the sfall Speed patch:

[Speed]
Enable=1
SpeedMultiInitial=300

It doesn't ❌ deal with the keybinding part:

[Speed]
SpeedMulti0=50
SpeedMulti1=100
SpeedMulti2=200
SpeedMulti3=300
SpeedMulti4=400
SpeedMulti5=500
SpeedMulti6=600
SpeedMulti7=700
SpeedMulti8=800
SpeedMulti9=900

[Input]
SpeedModKey=-1
SpeedToggleKey=0

SpeedKey0=0x52
SpeedKey1=0x4f
SpeedKey2=0x50
SpeedKey3=0x51
SpeedKey4=0x4b
SpeedKey5=0x4c
SpeedKey6=0x4d
SpeedKey7=0x00
SpeedKey8=0x00
SpeedKey9=0x00

It also, out of necessity, implements much of the LoadGameHook flag tracking in a new file loop.c. With this we now have an easy way to check whether eg. an inventory screen is open, etc.

Proof of concept

vid.mp4

Approach taken

• Reimplemented getTicks() to optionally multiply its result
• To accomodate for the big condition, I implemented large portion of the LoadGameHook sfall module into loop.c

Related links

• sfall LoadGameHook.h (definition of LoopFlag)
• sfall LoadGameHook.cpp
• sfall SpeedPatch.cpp
• relevant sfall ddraw.ini config

Possible problems (maybe they are also problems on main, and not caused by this patch?)

• From my gameplay it seems like critters (like eg. geckos in Toxic Caves) don't move (as in, walk and wander around) as often as in the original game (from my memory). They almost don't move at all. Maybe their movement runs on the original speed somehow? Maybe this is an issue in original+sfall SpeedPatch as well? Seen on main as well
• Companions seem to only attack if the enemy is in range, they won't walk to them. (With the distance setting at "Charge!") In the end they do move towards the enemies, it's just not always.
• Steal odds seem way too good (considering my character has 20% on the skill). It still can fail, but it probably should fail more.

[Janiczek]

A function with this code already exists, see line 462:

// 0x48FC48
 int showOptions()
 {
     return showOptionsWithInitialKeyCode(-1);
 }

[Janiczek]

I suppose these could also live in loop.h as extra flags? Depends how much we want to stay close to sfall, I guess. WDYT?

[phobos2077]

• Steal odds seem way too good (considering my character has 20% on the skill). It still can fail, but it probably should fail more.

I'm pretty sure steal odds shouldn't be related to speed patch in any way. I've have researched that code last year when working on steal rebalance. It's just regular math and Fallout's RNG.