Set of OpenGL demos

Parallax Occlusion Mapping

A relatively simple technique that adds a depth and shadows to a flat texture without adding additional vertices.

According to http://sunandblackcat.com/tipFullView.php?topicid=28

Screen Space Ambient Occlusion

A technique for efficiently approximating the ambient occlusion effect in real time.

According to https://learnopengl.com/Advanced-Lighting/SSAO

Physically Based Rendering

Shading model seeks to render graphics in a way that more accurately models the flow of light in the real world.

According to https://learnopengl.com/PBR/Theory

Environment cubemaps were taken from sIBL archive. PBR materials were taken from FreePBR.com.

Reflective Shadow Maps

An algorithm for interactive rendering of plausible indirect illumination. It is an extension to a standard shadow map, where every pixel is considered as an indirect light source.

According to this paper http://www.klayge.org/material/3_12/GI/rsm.pdf

I have not implemented final interpolation step (with recalculation of global illumination at edges), as described in the paper. Instead I simply interpolated illumination from low-res texture for whole screen. This leads to blurry halos around the objects.

Setting up

This project requires OpenGL, SDL2, GLEW, OpenGL Mathematics and Cmake to be installed in your system. Once there, use cmake to generate a project for your favorite IDE. In case of unix systems and make building should be as simple as

mkdir build
cd ./build
cmake ..
make

This will generate binaries for all subprojects in corresponding subfolders insinde bin folder.

Note that shaders code placed straight inside bin/<project_name> for simplicity.

Keep in mind that depending on your version of cmake and/or different versions of "find" modules, libraries path constant name may change a bit. For example, some versions placing found sdl path to SDL2_LIBRARY and SDL2_INCLUDE_DIR, while others use SDL2_LIBRARIES and SDL2_INCLUDE_DIRS. Take a look into Modules/FindSDL2.cmake(and other used scripts) in your cmake folder to get proper constant name, and use those in the base project.

Controls

• use w,a,s,d for navigation;
• click anywhere in the window to toggle mouse look;
• use mouse scroll wheel to zoom in / zoom out.