This is a list of examples done a few years ago after taking a computer graphic course to better understand opengl and apply some of the techniques read in the litterature.

Content of the repo:

• Triangle: hello world program, tests the display and the buffers
• Rotating cube: Add movement in the scene and transormation matrices
• Texture plane: Tests textures, both from an image and generated
• Sphere light: Different lightings on a sphere: Flat Goureaud and Phong with interacitvity to select the lighting type
• Terrain camera: A terrain generated with a Perlin noise in which we can navigate with either a free moving camera or a FPS-style one
• Bumpmapping: Simulates bumps on a flat surface using random Perlin noise and pixel shader
• Framebuffer: Displays the scene in a framebuffer, allowing post processing effects: gaussian blur, edge detection, etc.
• LOD Terrain: Implementation of a perlin noise terrain with simple CPU LOD implementation (using quad tree), which is dynamically updated with camera position
• Shadow mapping: Implementation of a dynamic shadow mapping using a depth buffer from the point of view of the light, smoothing techniques are applied on the shadow to make it less pixelated
• Ambient occlusion: Deferred SSAO algorithm done in the shaders which give depth in a scene, a few different algorithms are implemented
• Grass: Display 100k individual grass elements using instanced drawing and geometry shaders and make them move in the wind with a perlin noise
• Water: Reflects objects on a water surface with waves distorting the reflexion
• Sky: Displays a moving sun on a sky-sphere
• Particles: A simple particles system using instanced drawing
• Tree: Procedural generation of realistic trees using L-System
• Atmospheric scattering: implemented in a similar way as in the GPU Gems 2 book
• Volumetric clouds: using combination of 3d and 2d noises and particles
• Texture filtering: use opengl to smooth textures
• Tessellation shader: implement the level of detail directly in a shader

All of these examples have been tested on the following hardware:

• Intel HD graphics 620
• Nvidia GeForce 940MX

There were compiled on a Linux Mint 20, the needed libraries are the following:

• glfw 3.3.2
• glew 2.1.0
• devIl 1.7.8
• glm 0.9.9.7

Create a build folder in the example you want to build, then from the build folder, cmake .. to populate it and make to build the example