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By rewriting 4x4 matrix multiplication using SIMD I was able to increase the framerate of my game engine (written in C++) by 10-20% since its used so often
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Charlie Callahan
1.7K posts
Charlie Callahan
@ccallac7
Game engine development, C++, lua, PhD Mechanical/Optical engineering, laser sensing
Boulder, CO Katılım Aralık 2024
584 Takip Edilen1.8K Takipçiler
@Xaraphim Sick. I was actually planning on testing out some openFOAM sims with fable… openFOAM can do a ton of interesting stuff - used it for combustion simulations in grad school
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@bouldercolorado Had a brutal bike crash on that one once when the old wood boards got wet from rain
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If you've walked the path over Boulder Creek near Scott Carpenter Park recently, you may have noticed it looking a little different. We fully reconstructed the bridge earlier this spring — restoring it to safe, sound condition for the thousands who cross it every year.
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Just a 2D tileable noise texture (I used solid noise filter from Gimp but you can generate it in code too).
I sample it at each pixel’s surface world position (world_pos.xz * scale), scroll the UVs over time along the global wind direction, and use that to modulate fog density. So that way "clouds" stay world-anchored. You move through them.
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Plugged wind noise into the fog shaders to generate some movement. Interesting results. 🌫️
Ioannis Koukourakis@JKoukourakis
How it Started vs. How it’s Going 2025 I built a custom C++/OpenGL 3D game engine and editor from scratch in less than a year, and just ~2h average a day. Now, let's see how far I can push it with a small proof-of-concept game next. As the year closes, I want to thank the group of people who has been following along while I created this project. The comments and reactions on every post motivated me to climb another step every day. Cheers!
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@JKoukourakis How does it handle when you move the camera around? Is it just a cubemap?
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@willdepue @RichardMCNgo This suggests that the network has way too many weights or too much numerical precision. Interesting result
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kinda funny you can draw a smiley face in your neural net before training and it’ll be there afterwards
you can also use photos. i trained a MNIST classifier initialized to my face and you can still see me at the end
works across inits, weight decay, LR, optimizers, see below
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This is a really interesting talk. Check it out if you’re interested in physics
Adam Brown@A_G_I_Joe
Einstein's general relativity is the closest thing we have to a perfect theory. You start by asking why your flight path seems to bend toward the north pole — and before long you've reconceptualized nature's most familiar force, with consequences not just for falling apples and orbiting planets but for the origin and fate of the universe. And it's all true! Had a great time discussing one of humanity's crowning achievements with @dwarkesh_sp
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@mcnabbd Ahh interesting. Well it runs insanely fast on my phone. Getting view dependent lighting stored via sph. harmonics would be very cool
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@ccallac7 the goal is to have a "just data" streaming format. no complex exe. no shaders. no textures.
stream more like video. buffer on the client.
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latest. "MIP" mapping. ray-traced reflections. but, this is the "source" app. Need to figure out how to statically encode the reflections. spherical harmonics, or gaussians, or ...?
it's "just" an html web page. here: github.com/dougmcnabb/pts…
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@ccallac7 I see and that is because your worlds are procedural, right?
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Added a ton of improvements to the minimap:
Biome based coloring
AO+shadowing to terrain
Tree sprites
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@OlexGameDev Hmm interesting. In my case the animation needs to be loaded to run some functions on it, in the example i included, it cant cache the animation index from the name string since it doesnt know what animations exist before its done loading
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@ccallac7 I keep animation component as pure data with indices. That way you can set the state anytime without worrying if the animation data is ready or not. The actual logic is handled elsewhere.
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My engine loads animations asynchronously to avoid stutter
But lua can set the animation state at any time even before the animation is done loading...
To make this work, I keep a stack of std::functions which get called after the assets load, to recreate the expected state
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@MegaPunkGames The minimap image is created during world generation on the CPU by just stamping trees onto the world and setting colors based on the biome. Then its saved as a png with the save file.
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@ccallac7 I'm curious how you created that. I'm working on the map for our game at work. We did this :
x.com/i/status/20738…
MegaPunk Games@MegaPunkGames
@iamcloudyfocus @BenjiGameDev I'm working on our map system at work (not MegaPunk) and we are using RVTs at editor time to produce texture tiles. We use 5 layers of RVTs that are then composed to a single texture. This allows LD to just do their thing and the map gets generated from commandlet
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@0xSero So cool, people are coming up with such interesting algorithms to get around the VRAM limitation. Very similar to CPU tricks to get around the Von Neumann bottleneck
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GLM-5.2 Nvidia NVFP4
No pruning, no quantising, exact same model card.
110 tok/s single stream.
My friend is a genius, holy fudge.
Here's the repo, he got full DS4-Flash on a 5090 + DDR5 github.com/kacper-daftcod… at 38.5 tok/s
This is a breakthrough.
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@mcnabbd Ahh interesting! How does it handle the camera moving? Or the mesh moving etc?
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@ccallac7 it's a surface-space (texture space?) decoupled renderer. render to surface space once. render from that to screen space many.
ps i'm thrilled to answer any questions
Doug McNabb@mcnabbd
Added a Viewer-Only app. This is the end-goal, have a trivial viewer app to which we can stream "just data", like video (vs complex programs, shaders, textures, etc. of a traditional 3D app)
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@OlexGameDev I need to clean mine up to be more like this... its getting out of control
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@ccallac7 The next level that calls into passes is slightly larger at 500 lines where each pass is a parameter list plus a function call.
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My render loop is over 3000 lines of C++
I need to spend some time consolidating...
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@OlexGameDev My highest level is 3k. All the lower level rendering code is probably around 10k additional
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@ccallac7 Hmm, it depends what you mean by a render loop. The highest level is only 200 lines but that just sets up basic wait/draw/present with all the passes hidden under it. The entire renderer is 41k lines of C++.
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