Games by MasonPosts Tagged with "tech"
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Highlights from "I spent 6 years developing a game in Rust and it just shipped, AMA"
I recently released Way of Rhea, a puzzle game that I’ve been working on in Rust since 2018. If you like games like Braid, Talos Principle, or Portal you’d probably enjoy it:
After launch I posted an AMA on r/rust_gamedev, and people asked a lot of great questions!
This write up contains curated highlights from the AMA, with some additional editing for clarity.
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Generating unique values for IMGUI IDs
An IMGUI. Sometimes, you just want some unique bits to use as an ID. Maybe you’re working with an immediate mode GUI, or need to generate IDs for cancellable sounds.
In many cases you could technically get away with manually enumerating the various unique IDs in a header somewhere, but this is very inconvenient–especially in the case of IMGUIs: if you do this, every time you add or remove a UI element, you need to make a secondary change elsewhere in the codebase. You won’t be able to freely copy paste UI code.
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Replying to YouTube Comments on my SYCL Talk
If there’s one thing I’ve learned from 29 years of internet, it’s not to reply to YouTube comments.
Let’s do it anyway!
I gave a talk at Software You Can Love (SYCL) titled It’s Not About The Technology - Game Engines are Art Tools. The YouTube recording premiered on Monday, and there was a lot of high quality discussion in the comments.
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It's Not About the Technology - Game Engines are Art Tools
In June, I gave a talk at Software You Can Love titled It’s Not About The Technology - Game Engines are Art Tools. The intended audience was systems programmers, but there are lessons here for people evaluating off the shelf systems as well.
This is a part two to my talk from Handmade Seattle last year, It’s Not Survivorship Bias - On Successful Software Endeavors.
Please note that I’m playing a little joke at the beginning that may not work as well without a captive audience considering the recent Unity BS, so please watch the whole thing before yelling at me.
See my replies to comments here.
Recording (premieres at 12pm PST)
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Make Your Own Game Engine
Recent events have a lot of studios thinking about their choice of game engine, and at first glance, options appear to be limited. But things don’t have to be this way.
For most studios, the optimal short term strategy is to wait and see if Unity is forced to back down. Retroactively altering the engine license for shipped games certainly doesn’t sound legal.
While waiting it out may be pragmatic for existing projects, it doesn’t save you from the nightmare of having your entire business beholden to the whims of Unity Technologies™.
You could decide to switch engines for future games. Many people will go to Unreal. I trust Epic more than I trust Unity, in particular because they give everyone source access, but if you’re switching anyway I recommend looking into the free and open source engine Godot which is MIT licensed. Info on console support here.
There is, however, another option. The nuclear option.
You could write your own game engine.
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Way of Rhea - Linux and Steamdeck Support!
My puzzle game Way of Rhea now runs natively on Linux, and Steam Deck! This is in addition to the existing Windows support.
The new demo also has some quality of life improvements–namely the ability to pause and fast-forward time.
You can give the free demo a try here, if you run into any issues please let me know. :) Please note that if you’ve ever run the game through Proton, Steam will default to Proton despite the presence of a native build. The UI does not always reflect this correctly, you need to toggle Proton on and back off.
The rest of this post covers some technical details for those interested in the porting process, and unfortunately, announces that I’m dropping the planned macOS support.
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Thoughts from GDC '23
Posting this a little late, but I had a great time at GDC this year! I got to catch up with a lot of people I don’t get to see very often, and meet a lot of new folks.
On top of that, a member of GUMBO won the IGF Grand Prize, and the Nuovo award, with his game Betrayal At Club Low. You should play it–Cosmo makes great games, and you don’t have to take my word for it this time what with the whole winning the IGF thing.
I’ve written up my personal takeaways from some of the talks I attended below.
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Making Your Game Go Fast by Asking Windows Nicely
(original) Normally, to make your software go faster, it has to do less work.
This usually involves improving your algorithms, skipping work the user won’t see, factoring your target hardware into the design process, or modifying your game’s content.
We’re not talking about any of that today. This post is a list of ways to make your game run faster on Windows–without making any major changes to your game’s content, code, or algorithms.
I employ these optimizations in Way of Rhea, a puzzle adventure written in a mix of Rust and a custom Rust scripting language. While this project is written in Rust, all the optimizations listed here are language independent–where the translation isn’t straightforward I’ve provided both Rust and C++ examples.
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When To Rewrite
Alright, why not. :)
Backstory
So this tweet by Promit Roy got a lot of attention recently, and I think it’s really great advice.
As someone who ends up building a lot of architectural and infrastructure code, there's one thing I cannot emphasize enough: do the simplest thing that works. Do not try to imagine future requirements, or support ill-defined potential use cases. It will always change later.
— Promit Roy ⚡ (@promit_roy) June 18, 2021Beginners tend to have trouble hearing this advice. I think this is in part due to many schools still teaching the opposite approach, but also, because planning is attractive in and of itself. “Sure, my plans didn’t pan out this time, but next time will be different!”
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How To Write a Crash Reporter
So. Up until last week, Way of Rhea did not have a crash reporter. This is kind of a problem!
We’re a small, self-funded team. Our initial reviews could have a big impact on sales. The last thing we need is for an easily fixable crash to mess up our day one reviews!
I’ve tested the various aspects of the game on a large variety of setups, but there’s always a configuration you’ve yet to test. I’ve participated in lots of events with test builds, but I doubt most players will bother to report when a free demo crashes unless they’re already very invested, or reporting it is very easy.
So. Let’s make it easy!
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Merge Conflicts: Avoiding Them, Making Them Less Painful
Hey Mason could you explain to me a safe way to use github with multiple users for a Unity project? I know a little about github, and I’ve set up the project with the Brackeys’ tutorial. That all went great. I even have the other people pulling the project onto their machines successfully. And I can successfully do a push from mine. My concern is what if they make changes, and want to push. Do I need to do a push first before they do or do they need to do a pull before they do a push? I’m a bit confused on the sequence, and in 120 the git got all screwed up and that has me concerned!
Normally, I reserve this blog for updates on Way of Rhea, or low level engine work. This post is a little different.
Way of Rhea is entirely self funded. Some of that funding comes from savings from when I worked full time as a programmer, some of it comes from freelance work1, and the rest comes from teaching grad and undergrad students game dev.
Regardless of whether I’m currently teaching grad or undergrad, Unity or engine dev, general C++ or graphics programming, there’s one key programming skill that nobody seems to ever teach my students before they get to my class: version control.
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Need someone to overhaul your shader compiler, build a reflection system for your engine, or improve your enemy AI? I do a lot of gamedev freelance–feel free to get in touch! ↩
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Fullscreen Exclusive Is A Lie (...sort of)
Fullscreen exclusive is a real thing your computer can decide to grant a window, but, as of yet I haven’t been able to find a single game where the fullscreen exclusive vs borderless window settings consistently do what you’d expect them to.
If you’re an expert in this topic and believe this post is incorrect in any way, definitely email me or DM me on Twitter and I’ll issue a correction!
If you’re interested in jumping to the conclusion, see Testing Fullscreen Exclusivity in Other Games and Takeaways. If you’re interested in my methodology, read on.
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Setting a Rust Executable's Icon in Windows
This morning, I decided it was long overdue that Way of Rhea get its own icon.
I believe that if you’re building a project in Visual Studio there’s a UI through which you can change your exe’s icon–but I’m not a Visual Studio user. It took me quite a while to figure out how to set an exe’s icon from the command line, so I figured I’d document what I learned here in the hopes of saving someone else some time.
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Symmetric Matrices & Triangle Numbers
With Santa Cruz officially in lockdown due to COVID-19, I’ve been at home a lot working on Way of Rhea. Since I’m left without any excuse for not posting, here’s a neat proof I happened across while working on some new puzzles. :)
Symmetric Matrices
Wikipedia defines a symmetric matrix as “a square matrix that is equal to its transpose.” In other words, a symmetric matrix has symmetry along its diagonal such that
m[row][col]always equalsm[col][row].Why should you care about symmetric matrices?
I dunno, you read the title and chose to click on this blog post, you tell me. I’m interested in symmetric matrices because this morning, as part of a puzzle I was working on, I added a layer system to Way of Rhea’s physics engine.
The layer system essentially lets me define a number of layers rigid bodies can be placed on, and then for each layer-layer pair set a boolean that indicates whether or not collisions can occur between those two layers.
The pink orb should not collide with the player, but it should collide with the ground.Layers Default Character Orb Default trueCharacter truefalseOrb truefalsefalseSo for example, rigid bodies on
Layer::Defaultcan collide with rigid bodies onLayer::Character, but rigid bodies onLayer::Charactercannot collide with rigid bodies onLayer::Orb. You’ll notice that I didn’t bother filling out the top right half of the matrix. That’s because it’s symmetric! I don’t care whether an orb is intersecting with a character, or a character is intersecting with an orb; the result should befalseeither way.In general, symmetric matrices can be used to create per-pair properties. Here’s a couple other places I’ve had this come up:
- The coefficient of restitution is a property of object pairs, not single objects! It’s pretty common to set it per object and then “combine” the two coefficients using some heuristic, which is totally fine most of the time, but if you want finer grained control for gameplay reasons you probably want a symmetric matrix!
- I believe that the same holds true for friction coefficients. Regardless of the physical reality, it’s again possible that you’ll want fine grained control over this for gameplay reasons.
Mapping to a Two Dimensional Array
The first two times this came up, I just hardcoded a giant match statement and kept the branches in sync manually. The third time it came up, with the layer system, I figured it was time to come up with a real solution.
At first I considered implementing symmetric matrices as 2D arrays. I figured I could make a triangular 2D array and swap the row/col indices when necessary to stay in the triangle, or I could just store each value twice.
This would have been fairly reasonable IMO, but something was nagging me…
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Way of Rhea's Entity System
I posted this poll on Twitter few weeks ago:
Entity systems won by a long shot, so that’s what I’m going to be writing about today.
In particular, I’m going to outline the process that lead me to Way of Rhea’s current entity system. Way of Rhea is being built in a custom engine and scripting language written in Rust, but the ideas described should still be applicable elsewhere. Hopefully this writeup will be found helpful, or at least interesting. :)
The Ad Hoc Approach
Way of Rhea’s initial prototype didn’t have an explicit entity system—I wanted to get something playable on the screen ASAP to validate that the game idea was worth spending time on. Each time I wanted to introduce a new entity type, I just made a new struct, and an ad hoc decision on where to store it.
This approach is severely undervalued. Letting yourself be inconsistent during the early stages of a project has two big advantages:
- It lets you prototype just the thing you’re actually trying to build.
- It generates a lot of data on what a generic system would actually need to accomplish. It’s hard to build a good cart before you know anything about the horse. :)
Some entities like the player were hard coded into the all-encompassing "world" struct, while others were stored in a tile map and exposed to the editor via the pictured GUI. As most entities in the game were fairly independent of each other, this approach served me well for almost a year. As time wore on, though, I had more and more ideas that couldn’t be expressed well in the system I’d built up…
Many of the puzzles I wanted to build involved entities being run through some sort of physics simulation, which would have been difficult to add to the existing codebase. It was going to be difficult to add things like physics puzzles to the game if there wasn’t a good way to share data and behavior between entities. This problem seemed chronic enough that it was worth solving the general case.
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Scripting Language Cleanup
When we built the original [Way of Rhea] demo, we only had 9 days to get it working before the Playcrafting expo we had signed up for, so we had to cut a lot of corners. Since then I’ve been doing bug fixes and working on a lot of miscellaneous engine/language features that I either couldn’t get done in time for the demo, or didn’t realize were important until I started building it.
We’ve made a few game updates since then (we now have sound!), but this post is specifically going to explore some language updates I’ve made.
I made a bunch of smaller changes that I’m going to just gloss over here:
- Adding new compiler warnings
- Fixing a parser error in compound assignments for structs (e.g.
x.y += 2) - Fixing bugs in the type checker
- Supporting a similar struct initializer shorthand to what Rust allows (e.g.
@Vec2 { x: x, y: y }can now be written as@Vec2 { x, y })
And some slightly bigger ones I’ll write about more in depth.
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