A wrapper around Minecraft Raspberry Pi to get it working on Novena
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README.md
bcm_host.c

README.md

Minecraft: Pi Edition wrapper

This is a wrapper for Minecraft: Pi Edition's OpenGL ES drivers. It makes several assumptions about running on a Raspberry Pi, some of which are not valid on our system (Kosagi Novena). Namely, it suffers from the following:

  • Requires libbcm, which does not exist outside Broadcom chips
  • Does not pass the window object to eglContextCreate()
  • Calls init()/destroy() multiple times, which crashes our vendor's GL drivers
  • Links against libGLESv2.so but uses GLES 1.0

This library and runtime environment aim to solve these problems.

Usage

To compile our libbcm replacement, simply run "make".

Then download Minecraft from http://pi.minecraft.net/ and extract it so that minecraft-pi is in the current directory.

Copy /usr/lib/libGLESv1_CM.so or /usr/lib/arm-linux-gnueabihf/libGLESv1_CM.so to this directory and rename it to libGLESv2.so

Finally, run minecraft-pi with the following invokation:

LD_PRELOAD=./libbcm_host.so LD_LIBRARY_PATH=$PWD ./minecraft-pi

Gotchas

Minecraft is run at full-screen for performance reasons. Unfortunately, the Minecraft program doesn't have an "Exit" function, so you'll have to come up with your own way of killing it.

Design

There are counters that monitor how many times various functions are called. Minecraft seems to initialize EGL and then tear it down again right away, which causes our vendor's driver to crash. To get around this, we count how many times each driver is invoked, and only call the real egl functions after a certain number of invocations.