A simple tetris game implemented for self-education purposes. Here is a link to a video with gameplay for illustration.

Code organization

The game logic is implemented in tetris.cpp. The exact game rules and mechanics are figured from several wikis about Tetris.

Class Piece represents a game piece ("tetrimino"), it defines how a piece rotates and kicks off obstacles.

Class Board represents the geometric state of the board. It stores which tiles are occupied, the position of the current piece and processes required motions obeying geometric constraints. Class Tetris operates on Board and defines game timings, user input processing and scoring.

The drawing functions are implemented in render.cpp. It defines several convenience classes to render board, pieces and text using simple OpenGL shaders.

File utility.cpp contains classes representing a shader, a texture and a font glyph. As well as functions to load a texture and a font from a file.

The game initialization and main loop is implemented in game.cpp in the most straightforward manner without farther abstractions.

Building

Building was reworked and tested for Ubuntu 20.04. It's too much hassle to properly support all platforms because of peculiar dependency libraries.

Install required packages:

sudo apt-get install libglew-dev libfreetype-dev libglfw3-dev libglm-dev libopengl-dev

Then use CMake to generate and execute build.

Make sure that resources folder is near the executable before running.

Credits

http://learnopengl.com was amazingly helpful to learn basics of OpenGL. Some utility code was based on samples from there.

Tile sprites and font by kenney.nl.

Keyboard key sprites by Xelu.