Paradox3D - Software based 3D renderer and game engine

Tech Demo: https://youtu.be/mdugjHo4CDM?si=DkSsutngI7AYFAr8

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About the project and some notes

This project is just a demo. It's provided "as-is" and further development is discontinued.

The code requires some refactoring. However, you can use it as an example or to boostrap your own software-based renderer and/or 3D game engine.

The rendering is all coded from scratch in plain C.
That includes:

• vector & matrix math
• drawing line primitives (bresenham's line algo)
• triangle rasterization
• texture mapping
• polygon splitting
• frustum clipping

It requires SDL2 to create an OS-agnostic rendering context and handle input events.
You can implement a native one, utilizing the provided APIs of your target OS if you prefer to ditch the 3rd party deptendency.
Graphics subsystems which you may use for some of the major OSes:

• GDI+ for Windows
• Core Graphics for macOS
• XLib for Linux and flavours

Compiling

Currently it's configured to be build with Visual Studio on Windows and gcc on macOS or Linux.

• When using the Makefile (not building with Visual Studio) make sure to set your SDL2 paths before building.
  
• When using Visual Studio, again - make sure you set the SDL2 paths in the project properties include and lib directories (the VS linker and compiler options).

Some of the features include:

• perspective-correct texture mapping via barycentric interpolation
• bresenham's line drawing algorithm to perform primitives rendering
• scanline rasterization
• realtime illumination
• 3D math (3D transformations, matrix and vector operations)
• z-buffer
• backface-culling
• frustum polygon clipping
• mouse and keyboard input
• supports 3D models in OBJ format
• supports textures in PNG format
• no spatial partitioning at this point