OpenGL-tutorial_v0014_21

OpenGL tutorial from http://www.opengl-tutorial.org/

Due to the old graphics hardware, it's OpenGL v2.1 here.

Building on Linux (Linux Mint 17.0)

1. Install the latest driver for graphics hardware.
2. Install the required lib, compiler and tools: cmake make g++ libx11-dev libxi-dev libgl1-mesa-dev libglu1-mesa-dev libxrandr-dev libxext-dev
3. Download the source code and unzip it to, say, ~/OpenGL-Tutorial/
4. Run commands: mkdir build && cd build && cmake ..
5. Run make to build project.