C++ Weekly - Ep 224 - RPG In C++20 - Part 5: Dealing With Game Input Events

More work on game input events, plus cleanups and refactorings of the ImGui interaction code.

☟☟ Awesome T-Shirts! Sponsors! Books! ☟☟

T-SHIRTS AVAILABLE!

WANT MORE JASON?

SUPPORT THE CHANNEL

GET INVOLVED

JASON'S BOOKS

► C++23 Best Practices

► C++ Best Practices

JASON'S PUZZLE BOOKS

► Object Lifetime Puzzlers Book 1

► Object Lifetime Puzzlers Book 2

► Object Lifetime Puzzlers Book 3

► Copy and Reference Puzzlers Book 1

► Copy and Reference Puzzlers Book 2

► Copy and Reference Puzzlers Book 3

► OpCode Puzzlers Book 1


RECOMMENDED BOOKS

AWESOME PROJECTS

O'Reilly VIDEOS

[Turbo]

RE: Gamepads and "Standard"; "Press 'X'" means different things depending on what your playing on!

[akj]

19:00 Instead of those infinitely long switch cases, you could have used a state machine, or used the visitor pattern by inheriting from lambda functions.

[dimeterious_fox]

Really interesting series of videos! Really like it.

Btw, `magic_enum` is awesome lib which can magically do enum to string casting for you.

[enggeraldobraz]

I love these type of videos. Very instructive.

[bradynglines]

Just in case anyone else runs across this: In the ImGuiHelpers::Text function, I had to use fmt::runtime(format) as the first argument to fmt::format. Otherwise, I would get errors about the format not being a constant expression.

[AusSkiller]

LOL at 13:36 when he is switching to firefox I got an ad for Chromebooks almost like it knew a competitor was about to be shown.

[NealMiskinMusic]

I would like to know a bit more about how an event loop actually works. I understand that there is a loop where you read events, fetch, decode, execute, but what is an event and how does the program know about them? Is it like an event stack in memory where the OS pushes events and your program pops one off each iteration through the loop? How does this almost infinite event loop not eat up too much CPU time to do anything else? I have many questions...

[dabraude]

Just a suggestion: rather than trying to work with every key / joystick etc event. Have actions and key bindings to those actions which are loaded from a config file and saved in an unordered_map.

[ClassyDragon]

I was legitimately researching this exact topic last night 😂

[Omnifarious]

4:30 - When reading different aspects of the joystick state, isn't there a race condition issue? Possibly a race against the incoming events?

[katanasteel]

the conventional way to handle keyboard presses is to keep an array of keys and when a key is pressed set that index, when the key is released unset that index

(Key == struct or bool)
Key keys[MAX_KEYS]{};
while(getEvents(&event)) {
switch(event) {
...
case KeyPressed:
keys[event.key] = true;
break;
case KeyReleased:
keys[event.key] = false;
break;
}
...
}
then in the logic one would interrogate the keys array

[petermuller]

Great Episode! However, would it be possible to mute the editor beep, it's quite obnoxious

[disieh]

I know this series is about applying C++20 in a game engine context. However, one follow-up idea would be really interesting: how to make CMake plop out working .ipa and .apk packages. I never found a good guide on how to do that.

[SimonToth]

Man I wish you would stop putting everything into main :-D I have been struggling with making libraries work correctly in your starter template and you just keep not using libraries.

[Alex-frtd]

what ide is this? i saw serenity dev use it as well