Stefan
@schteppe
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Senior software engineer @StarStable . C++, physics, Jelly Mario, p2.js, cannon.js
Boden, Sverige
Joined March 2009
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A space exploration game, where you discover that outer space is too far from the origin, and you start getting float32 precision problems
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Turning off gravity for everything but mario + enemies seems to work well! Just got to anchor those floating boxes :)
#gamedev
#webgl
#jellymario
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Geometry images: vertex positions and normals are stored in textures. Image compression can be used to store them, and they can be sampled at different (mipmap) levels to get different triangle counts
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WebGL 1 doesn't have bitwise operators, required for collision masks... I ended up using a rather primitive but fast collision filter: dot(particleA.filterVec,particleB.filterVec)>0.
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A list of NPM / Node.js packages is scrolling in the background as the news reporter is trying to explain what a Twitter bot is.
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@techsavvytravvy
Code that has been battletested in 1000 apps probably has less bugs than code that has been used in 0
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-fbounds-safety: Runtime & compile time bounds checks for C code in LLVM. Low overhead makes it possible to ship checks to users.
This tackles one of the biggest causes of vulnerabilities in software today. This is huge!
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I think there are too few physics engines in the world, so I'm making a new one with springs and speculative contacts
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To solve the floating point precision problem in open world games:
Divide world into cells. When the player changes cell, move the world so the current cell is at (0,0,0). Physics and rendering is performed relative to the current cell origin.
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p2.js is my 2D physics engine. I just released v0.1 with live docs and new demos rendered with Pixi.js
http://t.co/H0BaGNiNXl
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I wrote that null pointer dereferencing is a problem in C++, on Reddit, and got downvoted to oblivion.
Why?
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Cannon.js ragdoll spotted in a
#webgl
ad! Great work
@Make_Us_Proud
!
#javascript
#cannonjs
#gamedev
#gamephysics
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When using double precision, similar things happen at the same distance from the origin. I guess this means HTML5 canvas is using single precision floats under the hood
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gmake
cmake
nmake
qmake
There can only be 26 different make commands following this pattern! Claim one before we run out of letters
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p2.js v0.2: Friction, more shape types, faster broadphase... See demos (and try mouse picking):
http://t.co/H0BaGNiNXl
#javascript
#physics
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-Wall -Wextra -Werror
The world would be a better place if the above compiler flags were enabled by default
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Rust dev watching C++ devs work
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My first Rust reactions (coming from C++):
const by default 👌
Implicitly “auto” everywhere 😍
No null pointers 🤯
Can’t have 2 mutable refs to same value 🤔👍
Use after move = compile error 👍
Built in style checker 👍
Modules & package manager 📦❤️
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@incomputable
Use the standard format: YYYY-MM-DD
Using slashes is a bad idea: doesn’t work well for file names
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if(value == 42){ ... }
- boring
- predictable
if(42 == value){ ... }
- can’t accidentally use assignment
- stands out
- Yoda approves
#programming
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Q: What does SSO mean?
Average person: Single Sign On
C++ programmer: Small String Optimization
Me: That’s the game I’m working on, Star Stable Online
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This line of code may look innocent:
x = lerp(x, target, deltaTime)
But this is what happens when the framerate gets low! It overshoots. Switch to a framerate independent version before it's too late! Code:
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@ImLunaHey
Yep. And they slow down code reviews. They can’t see issues that a linter would highlight, so humans have to point them out while reviewing instead
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State of mobile web? (screen %)
20% UI
20% cookie consent
20% related content
20% ads
20% "download app"
0% content
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Fixing bugs and adding some test cases to poly-decomp.js. The library is for decomposing a concave 2D polygon into convex polygons.
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This guy rewrites zlib using "good" C++. Impressive how much less code it required. We should rename the language to C--.
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Precision problem solved! I went with the cell based solution. Space is divided in NxN cells. Simulation + rendering happens locally in each cell, which is 1x1 km.
I can now start exploring the solar system! For reference, the Earth-Sun distance is about 10^11 m.
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Programming is a process of discovery. One step reveals the next.
This is why it’s very difficult (impossible?) to make time estimates in software dev
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Particles within the "broadphase collision box" will collide. On the GPU, it's a texture containing ID's of particles in each cell.
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Guard clauses: Return early for the unusual cases.
Emphasizes the happy path, removes nesting (and sometimes mutable variables too!). Error cases are placed closer to their corresponding checks.
#refactoring
#programming
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While investigating the
@Spotify
music visualizer I find Three.js in there!
#threejs
#webgl
#javscript
@mrdoob
http://t.co/uu7IXJVQku
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Dynamic update of individual body properties (position, rotation, velocity, mass)
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p2.js v0.4: PrismaticConstraint, RevoluteConstraint limits, and more. Check out this cool ragdoll demo:
http://t.co/1ZdpDuoy3o
#javascript
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