EEL

Modern OpenGL (3+) sample program.

It displays a (very simplified) 3D eel (with 2 materials, normal mapping and togglable animation) in a skybox with 2 sources of light. There is also a test-sphere present 'behind' the camera (assuming default camera orientation). In the scene there are 2 sources of light (white - 'sun' and red - red sphere).

Main features

• Working in OpenGL 3.3 Core profile
• Most computations happen in shaders (almost zero CPU usage)
• Improved Blinn-Phong attenuated shading model
• Normal mapping
• N light sources per scene, M materials per object (with alpha-blending - it's possible to apply a non-specular material on a very glossy one)
• Modular/OOP design

Controls

• WSAD for camera movement
• Mouse for camera rotation (when enabled - see below)
• F to toggle fullscreen
• M to toggle mouse capture (disabled on startup)
• T to toggle animations (rotations)

Requirements

• OpenGL 3.3 capable graphic card, e.g. Intel HD Graphics 3000 (Intel Core 2nd gen CPUs), NVidia GeForce 8 series, ATI/AMD Radeon HD 2000 series and newer
• C++11 compatible compiler (tested on modern GCC and VC++)
• For Windows: installed VC++ 2015 redistributable package (due to included precompiled libpng file)
• For non-Windows OS: installed OpenGL, GLUT, GLEW, zlib and libpng libraries (Windows headers and pre-compiled .lib files are included)

Compilation & running the program

• Preparation: put your textures in eel/Resources/* and/or adjust paths in main.cpp (some textures, generated by me in GIMP, are present but some aren't there due to copyright reasons)
• Windows: use eel.snl Visual Studio solution file or eel/eel.vcxproj project file (open with VS or import to your IDE of choice). Build and run.
• Linux/*nix: use provided Makefile (make or make run should be enough).

Known issues:

• Execution caveat: hardcoded relative paths to textures (in main.cpp). Run from 'eel' directory (with Resources directory in it - see Makefile) or modify the paths (or change the way they're passed). Using VC++ run target or make run will handle it for you though.
• Mouse capture may not be working in MacOS (GLUT limitations; should work with up-to-date GLUT though)
• The OOP design of the program is quite poor
• The animations are being calculated on CPU (possible performance bottleneck)

Special thanks

• Vlad Badoiu, Sergiu Craitoiu and Ana Mihut for their great tutorial on modern OpenGL.
• Christian Schüler for his note on normal mapping without precomputed tangents

Copyright notice

This software is licensed under MIT License (see LICENSE file).