Meson build files for 1.79

[stephanlachnit]

Closes #7.

First note: with >1.79 the examples folder will not include the backend implementations anymore, they will be in the backends folder instead.

Second note, regarding #7. I switched from features to booleans, as I don't think that the library should depend on libraries just because they happen to be installed on the system. If one wants a specific implementation, it should be enabled by hand. Kinda important for reproducibility as well, as I want to use this in project that will end up in a Debian package eventually.

Third note, regarding OpenGL. I removed the legacy opengl2 option, as one can also use OpenGL 2.x with the opengl3 implementation as well. Also, currently we only have one OpenGL loader, namely glew. However, as we can see here, there are much more options. Since glew is the preferred option and I don't actually need any of those, I don't really care about implementing the others.

/cc @st4ll1 @XPXPv2 @TommyXR

[TommyXR]

Thank you, that solves a lot of things. Unfortunately I don't have write access to merge, but if it's not merged before the end of the week, I'll add an issue in the wrapdb repo (as suggested by the wrapdb guidelines).

[stephanlachnit]

@legeana friendly ping

[eli-schwartz]

Second note, regarding #7. I switched from features to booleans, as I don't think that the library should depend on libraries just because they happen to be installed on the system. If one wants a specific implementation, it should be enabled by hand. Kinda important for reproducibility as well, as I want to use this in project that will end up in a Debian package eventually.

This should be solved by using meson setup --auto-features=disabled and enabling each feature you want by hand. And/or the feature equivalent of type : 'boolean', value : false is type: 'feature', value: 'disabled' if you want them to not be checked by default. I do NOT see a good reason to change these to booleans.

[eli-schwartz]

You somehow ended up with a file named meson.options instead of meson_options.txt which means:

• the review tool immediately errors due to non-buildsystem files
• meson builddir/ immediately errors with

  meson.build:14:3: ERROR: Tried to access unknown option "dx9".
  

[stephanlachnit]

Oh wow how did I mess that up. Fixed.

[eli-schwartz]

What about my comment w.r.t booleans vs. features defaulting to "disabled"?

[stephanlachnit]

Switched to features, but I'll still need to test it. Can't test the Windows / OSX stuff, same with marmalade.

[stephanlachnit]

Alright, gave it a test compile and it works. For DirectX I found some Meson examples, so they might even work, for Metal no clue. Marmalade is proprietary, so no chance that I could test it anyway. The other stuff should work, but I didn't try every combination.

[eli-schwartz]

Sorry for forgetting about this. Thanks for the changes.