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https://github.com/rjindael/bigworld

OpenGL experiments
https://github.com/rjindael/bigworld

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OpenGL experiments

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# bigworld



OpenGL experiments



This is just a means for me to tinker around with OpenGL and get a fundamental grasp of how to perform 3D rendering for video games from C++. In this journey, I am using C++ and am following the [Learn OpenGL](https://learnopengl.com/) tutorial to learn OpenGL.



Currently tested to run on Windows only, but should compile and work for Linux (CI soon:tm:). Builds with Clang 18.1.1 targeting `x86_64-pc-windows-msvc`.



Checklist of things I want to do of varying complexity, in no particular order:



- [x] Get a basic GL app working (using SDL2)

- [x] Abstract a basic OpenGL rendering engine

- [ ] Get basic 3D rendering working (using cglm)

- [ ] Finish LearnOpenGL tutorial and whatever else

- [ ] Mess with boolean operations for sculpting 3D meshes

- [ ] Experiment with shaders

- [ ] Shadow mapping

- [ ] Shadow volumes that are then stenciled (and get this working with a vertex or geometry shader)

- [ ] Post processing effects (MSAA, SSAA, FXAA, bloom, color correction, blurring, sunrays)

- [ ] PBR materials

- [ ] Atmospheric effects (God rays, clouds, fog, haze, glare)

- [ ] Have a nice shader development pipeline, since I realize shaders get more complex as visual effects become more varied

- [ ] Eventually migrate over to SDL2 and start processing inputs from KB+M and a gamepad

- [ ] Experiment with getting this on Linux and Android and WASM (GL ES)

- [ ] Experiment with 3D audio with SDL2 audio

- [ ] Experiment with particles, soft particles, whatever else

- [ ] Ambient occlusion with a fragment shader (SSAO/HBAO)

- [ ] High refresh rate rendering

- [ ] 3D camera controls

- [ ] Basic physics with BulletPhysics

- [ ] libsm64 support



## Resources



Resources I have collected that I have found useful:



**High level info:**



- [LearnOpenGL](https://learnopengl.com)

- [All LearnOpenGL C++ chapter examples](https://github.com/JoeyDeVries/LearnOpenGL/tree/master)

- [ogldev](https://ogldev.org)

- [hello triangle by Anton Gerdelan](http://antongerdelan.net/opengl/hellotriangle.html) [(more)](http://antongerdelan.net/opengl/vertexbuffers.html)

- [hello triangle by Alexander Overvoorde](https://open.gl/drawing)

- [Debugging in OpenGL](https://learnopengl.com/In-Practice/Debugging)



**Shadow volumes**:



- [Wikipedia article on it](https://en.wikipedia.org/wiki/Shadow_volume)

- [Shadow Algorithms for Computer Graphics from SIGGRAPH](http://www.cs.rpi.edu/~cutler/classes/advancedgraphics/S13/papers/crow_shadows_77.pdf)

- [GameDev post on "The Theory of Stencil Shadow Volumes"](www.gamedev.net/page/resources/_/technical/graphics-programming-and-theory/the-theory-of-stencil-shadow-volumes-r1873)

- [Carmack on shadow volumes](https://web.archive.org/web/20090127020935/http://developer.nvidia.com/attach/6832)

- [Shadow volume extrusion w/ VS](http://developer.amd.com/wordpress/media/2012/10/ShaderX_ShadowExtrusion.pdf)

- [NVIDIA dev article excerpt of GPU rendering book doing this w/ a GS and occlusion](https://web.archive.org/web/20110516024500/http://developer.nvidia.com/node/168)

- [Pauls Projects technical info on this](https://www.paulsprojects.net/opengl/shadvol/technical.html)

- [Pauls Projects impl. of this](https://www.paulsprojects.net/opengl/shadvol/shadvol.html)

- [Silhouette detection from ogldev](https://ogldev.org/www/tutorial39/tutorial39.html)

- [Stencil shadow volume from ogldev](https://ogldev.org/www/tutorial40/tutorial40.html)

- [Some tutorial on shadow volumes](http://nuclear.mutantstargoat.com/articles/volume_shadows_tutorial_nuclear.pdf)

- [nVidia article from McGuire](https://developer.nvidia.com/gpugems/gpugems/part-ii-lighting-and-shadows/chapter-9-efficient-shadow-volume-rendering)

- [Presentation on this](https://web.cse.ohio-state.edu/~shen.94/781/Site/Slides_files/shadow.pdf)

- [StackOverflow thing on silhouette detection/edge detection with overlapping bodies](https://stackoverflow.com/questions/65010520/opengl-how-to-write-to-stencil-buffer-when-stencil-test-fails-and-depth-test-suc/65021525#65021525)

- [Shadow volumes from dev fjord](https://dev-fjord.blogspot.com/2012/03/jogl-part-3-shadow-volumes.html)

- [Ogre C++ impl.](https://github.com/OGRECave/ogre/blob/master/OgreMain/src/OgreShadowCaster.cpp)



**Shadow mapping**:



- [LearnOpenGL explainer](https://learnopengl.com/Advanced-Lighting/Shadows/Shadow-Mapping)

- [Wikipedia page on it](https://en.wikipedia.org/wiki/Shadow_mapping) - see "Principle of a shadow and a shadow map"



**Soft particles**:



- [dev.to Implementing soft particles in WebGL and OpenGL ES](https://dev.to/keaukraine/implementing-soft-particles-in-webgl-and-opengl-es-3l6e)



**PBR**:



- [LearnOpenGL explainer on PBR](https://learnopengl.com/PBR/Theory)



**Post Processing effects**:



- [LearnOpenGL DoF](https://en.wikibooks.org/wiki/OpenGL_Programming/Depth_of_Field)

- [LearnOpenGL Bloom](https://learnopengl.com/Advanced-Lighting/Bloom) - get highlighted frags, blur, then composite :D



## License



bigworld is licensed under the [MIT license](https://github.com/rjindael/bigworld/blob/trunk/LICENSE.md). A copy of it has been included with bigworld.



bigworld uses the following third-party libraries:



- [cxxopts](https://github.com/jarro2783/cxxopts), a header-only C++ argument parser library, licensed under the [MIT license](https://github.com/jarro2783/cxxopts/blob/master/LICENSE)

- [glad](https://github.com/Dav1dde/glad), a header-only C++ OpenGL function loader library, licensed under the [MIT license](https://github.com/Dav1dde/glad/blob/master/LICENSE)

- [SDL2](https://github.com/libsdl-org/SDL), a cross-platform development library, licensed under the [zlib license](https://github.com/libsdl-org/SDL/blob/main/COPYING.txt)

- [SDL2_mixer](https://github.com/libsdl-org/SDL_mixer), a cross-platform audio library, licensed under the [zlib license](https://github.com/libsdl-org/SDL_mixer/blob/main/COPYING.txt)