Developer Diary | Tech

Bonjour friends, it’s your favourite Tech Lead again! Last year already I wrote to you in the final weeks leading to the release of the Barbarossa patch, and we draw close to the go-live of the Avalanche patch, here I appear again.

Old Platforms Retirement Plan

Like the future, technology is always in motion. As new platforms arise, olders need to be taken behind the barn and put down.

Don’t worry, we’re not talking about Windows 7 (yet 😉). Despite the release of Windows 11, we have not elected to make a push to Windows 10 since Microsoft’s support for new tech on older releases is still fairly good.

The same cannot be said for Mac and Linux, sadly. And so, starting the new 1.12.0 release, the minimum OS versions will be macOS 10.14 (Mojave) and Ubuntu 20.04 LTS (Focal Fossa). You will still be able to play older HoI versions on older operating systems by rolling back to previous branches, but Avalanche will refuse to start.

Those updates are done in order to introduce new tech to our games (not just HoI) and ensure that all can be built on the same infrastructure within the studio.

New Defaults

Last year we introduced the option to run the game with DirectX11 rather than the venerable DirectX9. After a long period of observation and very few issues observed, we have decided to make it the default.

The first time you start the Paradox Launcher on Avalanche, the game will perform a one-time upgrade of your settings from DirectX9 to DirectX11. New installations will also default to DirectX11.

If you notice any issue due to this change, first, please make a bug report, and then simply go to the settings page and set the renderer back to DirectX9.

Visually the game should look absolutely the same, but internally the tools that come with DirectX11 have helped us find a few sneaky graphical bugs that will be fixed in Avalanche, such as weird white squares appearing on the side of some tank models.

Performance Improvements

This is I bet the bit most of you were waiting for, the usual question of “will the new patch make the game run faster than previous versions?”. And I’m happy to say the answer is yes.

The biggest improvement has been made to the map icons rendering (unit counters, factories, supply hubs, you name it). The number of icons potentially displayed on the map had grown a lot since HoI’s release 6 years ago and the historical algorithm wasn’t cutting it anymore.

For example, here are what the FPS and frame time look like on Avalanche on my work desktop (i7700, NVIDIA GTX 1060, vsync off and 150 fps cap): Avalanche default zoom

And fully zoomed out: Avalanche zoomed out

Finally zoomed back in, but with Speed 5: Avalanche at speed 5

(If you forgot last year’s dev diary, you can pop up the ingame profiler by typing imgui show profiler in the debug console).

Contrast those numbers with the ones from the current live build (Barbarossa 1.11.13): Barbarossa default zoom

Note that Barbarossa denotes rendering performance in “render time” rather than “frame time”, which is only the GPU part, while Avalanche counts both CPU and GPU rendering time, so the numbers look different. Barbarossa zoomed out

Barbarossa at Speed 5

Since PDS games from HoI’s generation tie up rendering and game simulation, this will translate in faster tick speed (on top of a