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@sebbbi
sebbbi / fast_spheres.txt
Created February 18, 2018 19:31
Fast way to render lots of spheres
Setup:
1. Index buffer containing N quads (each 2 triangles), where N is the max amount of spheres. Repeating pattern of {0,1,2,1,3,2} + K*4.
2. No vertex buffer.
Render N*2 triangles, where N is the number of spheres you have.
Vertex shader:
1. Sphere index = N/4 (N = SV_VertexId)
2. Quad coord: Q = float2(N%2, (N%4)/2) * 2.0 - 1.0
3. Transform sphere center -> pos
@elieux
elieux / msys2-here-uninstall.reg
Created November 23, 2015 08:32
MSYS2 here context menu items
Windows Registry Editor Version 5.00
[-HKEY_CURRENT_USER\Software\Classes\Directory\Background\shell\MSYS here]
[-HKEY_CURRENT_USER\Software\Classes\Directory\Background\shell\MINGW64 here]
[-HKEY_CURRENT_USER\Software\Classes\Directory\Background\shell\MINGW32 here]
@piscisaureus
piscisaureus / pr.md
Created August 13, 2012 16:12
Checkout github pull requests locally

Locate the section for your github remote in the .git/config file. It looks like this:

[remote "origin"]
	fetch = +refs/heads/*:refs/remotes/origin/*
	url = git@github.com:joyent/node.git

Now add the line fetch = +refs/pull/*/head:refs/remotes/origin/pr/* to this section. Obviously, change the github url to match your project's URL. It ends up looking like this:

@jboner
jboner / latency.txt
Last active October 16, 2025 23:33
Latency Numbers Every Programmer Should Know
Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference 0.5 ns
Branch mispredict 5 ns
L2 cache reference 7 ns 14x L1 cache
Mutex lock/unlock 25 ns
Main memory reference 100 ns 20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy 3,000 ns 3 us
Send 1K bytes over 1 Gbps network 10,000 ns 10 us
Read 4K randomly from SSD* 150,000 ns 150 us ~1GB/sec SSD