This untangles some of the gigantic kitchen sink headers
in an attempt to split things into smaller files.
Also don't include gl.h, glext.h, windows.h,
and other such nonsense *everywhere*.
Lots of cleanups on the way too. More dead/unused code removal.
Remove incrFlag(), decrFlag() Lua functions.
The game cannot work with those anyhow...
```c
#undef BBGE_BUILD_IRRKLANG
#undef BBGE_BUILD_OPENALOGG
#undef BBGE_BUILD_XINPUT
#undef BBGE_BUILD_DELAYXINPUT
```
With this patch, entities can serve as a sound source whose position
updates relative to the listener. This implements the last missing
feature of my previous positional audio patch, which is moving sound sources.
Previously, all sounds were relative to the listener with the listener
centered at (0, 0, 0), and once a sound started playing, the position could
not be changed. Volume was set as an estimation of the distance to the listener.
These restrictions are now gone; OpenAL will handle the volume & panning
based on the distance.
The remaining problem is that stereo sounds are not attenuated, at all.
Lua additions:
- playSfx() takes an additional parameter now.
- entity_setStopSoundsOnDeath()
The first one caused the music to stop randomly on scene changes,
reproducible by changing maps with different music while holding 'G'
button to speed up time.
For some reason this caused the music to stop playing during the crossfade.
Wasn't able to find the root cause, so I added a little hack to kick the
music back on track if it stops unexpectedly.
The second one was a simple string case issue; mostly noticable because of
map background sounds not playing in loop mode.
(this is possibly a regression from an earlier patch, not sure)
- fixed warning about PlaySfx::handle
- fixed displaying subtitles - if the path was not full lowercase it didn't find its txt files.
- CMake: removed SDLMAIN_FOUND, which is seemingly only defined on windows and does more harm than good.
- glpng: always use new libpng API (fixes windows build)
