Blog

Sensor Monitoring App for Linux/Ubuntu

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I have created a Qt-based app to display and evaluate your computers sensor data using lm-sensors as backend. It's a modern approach using Qt Quick and QML in combination with OpenGL to render high quality graphs. I did it as a proof-of-concept but like to share it anyway. How to install for Ubuntu 13.10: sudo add-apt-repository ppa:henrythasler/pwnsensor sudo apt-get update apt-get install… [read more →]

Upgrade OpenSSL/OpenSSH in an OpenSuse/Apache2 server environment

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I recently read some things about forward secrecy and found that interesting enough to check my webserver installation. SSLLabs has a nice site where you can check your webserver regarding security features/issues with https connections. I got an F grade on my first test and decided I can do better... After reading more stuff (and some more on OpenSSL) I found out, that I probably just needed to… [read more →]

Converting LIDAR-DEM Data to SRTM

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This post is about using special DEM data for map creation. If you have no clue what DEM data is, read the article on wikipedia first. I use Maperitive to create my own map, optimized for hiking/biking. Right now, Maperitive uses SRTM-1 and SRTM-3 DEM data (HGT-Files). A decent description of SRTM-files can be found at vterrain.org. The Austrian Government (Land Tirol) has published… [read more →]

Heavy computing with GLSL – Part 5: Emulated quadruple precision

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It's been a while since my last post about the wonders of modern GPU computing with GLSL but the following concept really took a lot of time to get it to work as intended. Today I'm going to introduce emulated quadruple floating point precision (quad-single-precision) with GLSL. I will use the well-known mandelbrot set to demonstrate the concept. The sourcecode is available as usual. … [read more →]