root/apps/opengl_demo/

1. glfw_helpers.cpp
2. glfw_helpers.h
3. layout.cpp
4. layout.h
5. main.cpp
6. opengl_helpers.cpp
7. opengl_helpers.h
8. png_helpers.cpp
9. png_helpers.h
10. sample_filter.cpp
11. timer.cpp
12. timer.h