[DoveBrown]

I disagree with the characterisation that internal engines are less cross platform because of lock-in, the big publishers don't care about lock-in. It's not part of the calculus in deciding whether to support a platform or not.

A port of a game is more than changing the low-level APIs used to control the hardware. It's the hardware of the platfrom the decides the complexity of producing the port.

Linux is a special case because it's the same hardware as a the Windows. Your market is people who want to play the game but aren't dual booting. Most of the issues with producing your port are going to come down to driver incompatibilities and the fact that every Linux system is set up a little bit differently (the reason Blizzard never released their native Linux WoW client[1]). It's not a big market and there are loads of edge cases.

For big publishers and AAA development, they're not looking to break even or make a small profit. They need to see multiples of return on their money or they aren't going to do it. Using a shim is cheap and doesn't hurt sales enough to matter to them.

[1] https://www.phoronix.com/scan.php?page=news_item&px=OTA0NQ

[shmerl]

I'm looking at publishers who do release Linux games using internal engines. Most of them use binary or source wrapping. Only a minority are implementing proper native rendering in those engines. And I bet it's based on cost considerations like I said above. How would you explain it otherwise?

And I'm sure that cost plays a role when small market is evaluated. The higher is the cost, the less likely such publisher is to care, because prospects of profits are also reduced. So it goes back to my point. Lock-in proponents like MS and Co. benefit from lock-in in slowing down competition growth.

[DoveBrown]

I agree that cost is a consideration of doing the port. From my experience what renderering API is used at the bottom is a very small factor in that cost calculation.

I think where we disagree is that I don't think of the lower level API as being much of a lock in. The better graphic programmers I know have pretty extensive experience of the various flavors of DirectX and OpenGL. The general principles are the same and good programmers move between them easily.

[shmerl]

> I think where we disagree is that I don't think of the lower level API as being much of a lock in.

Lock-in here doesn't mean they have no technical means of implementing other graphics backends, it means that implementation is hard.

A lot of common middleware supports Linux just fine. It's graphics that's usually the biggest hurdle. People have expertise to address it, but it's still a tax to pay. And different distros support is a very minor thing in comparison.

If graphics is not the biggest issue, what is then in your opinion?

[DoveBrown]

> If graphics is not the biggest issue, what is then in your opinion?

Graphics is the biggest issue, but the issue isn't at the API level. It's in the driver and hardware differences below that layer.

The "tax" as you call it, comes mostly from the hardware drivers leaking through the abstraction. Part of this is AAA game developers fault since they are attempting to use all the GPU with edge-case tricks to eke out more performance.