htmlboss / OpenGL-Renderer

Modern OpenGL renderer written in C++17

MP-APS

A modern OpenGL 3D rendering engine. The idea behind it is to be very simple to use: no weird abstraction layers, janky variable names, or massive 2000+ line classes. It's primarily a playground for me to implement (or at least try :P) different graphics programming techniques. Progress has been slow since I'm juggling full-time Univesity studies, work, and trying to be physically active. Eventually, I want to create a "scene-based" engine, where you can load up some model(s), add some fancy lights, and virtually explore it.

Compiling

Ubuntu (and similar)

bash install-deps-ubuntu.sh
make
cd build/
./MP-APS

Screenshots

Anti-aliased wireframe rendering:

Physically Based Rendering:

Image Based Lighting (IBL):

Bloom:

(OLD VERSION) CPU-based terrain generation using Perlin noise:

Features

• Assimp model loading.
• Post processing (HDR, vibrance, bloom).
• Parallel AABB frustum culling.
• XML engine configuration.
• Support for #include directives in shaders.
• Shader-based wireframe overlay.
• Physically-based rendering.

WIP

• Variance shadow mapping (soft shadows).
• Depth-buffer optimization (https://outerra.blogspot.ca/2012/11/maximizing-depth-buffer-range-and.html).

Roadmap

• Shadow volumes (http://www.alexandre-pestana.com/volumetric-lights/, https://www.slideshare.net/BenjaminGlatzel/volumetric-lighting-for-many-lights-in-lords-of-the-fallen).
• Per-material array textures:
  • (https://www.gamedev.net/forums/topic/662654-best-practise-texture-atlas-38-vbo/?do=findComment&comment=5191703)
  • (https://www.khronos.org/opengl/wiki/Array_Texture)
• Re-implementing Forward+.
• More post-processing effects:
  • FXAA (http://blog.simonrodriguez.fr/articles/30-07-2016_implementing_fxaa.html).
  • Chromatic aberration (https://gamedev.stackexchange.com/a/58412/74957).
• Switch to sampler objects.
• Some kind of GUI.
• Atmospheric scattering: (https://github.com/korgan00/TFG-Atmospheric-Scattering) or (https://ebruneton.github.io/precomputed_atmospheric_scattering/)

Pipe-dreaming

• CDLOD Terrain.
• Planetary rendering.
• Global illumination (Cascaded Light Propagation Volumes).

Third Party Code

• Assimp.
• GLM.
• GLAD.
• GLFW.
• stb_image.
• pugixml.
• GLM AABB wrapper: (https://github.com/iauns/cpm-glm-aabb).

Research Used

• Fast Extraction of Viewing Frustum Planes from the World-View-Projection Matrix (http://www.cs.otago.ac.nz/postgrads/alexis/planeExtraction.pdf). Gribb, Hartman (2001).
• Forward+: Bringing Deferred Lighting to the Next Level (https://takahiroharada.files.wordpress.com/2015/04/forward_plus.pdf). Harada, McKee, Yang (2012).
• Solid Wireframe (http://developer.download.nvidia.com/SDK/10/direct3d/Source/SolidWireframe/Doc/SolidWireframe.pdf). Nvidia (2007).
• Physically Based Rendering (https://learnopengl.com/#!PBR/IBL/Specular-IBL)
• Variance Shadow Mapping (http://developer.download.nvidia.com/SDK/10.5/direct3d/Source/VarianceShadowMapping/Doc/VarianceShadowMapping.pdf)
• Tessellated Terrain Rendering with Dynamic LOD (http://victorbush.com/2015/01/tessellated-terrain/)