These demos use OpenGL version 2.1 and GLSL shaer version 1.2 which are depricated in many environment. But still it is convenient to use legacy functions such as glBegin(), glEnd(). We will eventually consider porting these demo into newer OpenGL >= 3.3 in the examples_newgl_glfw folder.
These demos depend on the GLFW library to open an OpenGL window. If you haven't install glfw in your computer, please read following Document to set up GLFW.
With glfw installed, you can build the demos simply by
mkdir build && cd build
cmake ..
cmake --build .
