A CPU Rasterizer written in Zig during my free time for fun and to learn.

Checkout Computer Graphics from Scratch section on: https://blackgoku36.github.io/BG36Notes/

If I remember correctly, I got spot model from: https://www.cs.cmu.edu/~kmcrane/Projects/ModelRepository/

Build Instructions

Requirements:

• The submodules
• Sokol-shdc bin from here, and set ENV var to it. (to compile sokol side shader, in case you just want to run, you can comment out line 15 from build.zig as the shader is already compiled).

Just do:

zig build run -Drelease-fast

You should get:

Some refs:

• https://www.scratchapixel.com/ (Huge thanks)
• http://acta.uni-obuda.hu/Mileff_Nehez_Dudra_63.pdf
• https://fgiesen.wordpress.com/2013/02/10/optimizing-the-basic-rasterizer/
• https://www.cs.drexel.edu/~david/Classes/Papers/comp175-06-pineda.pdf

Lion (Prev | ReleaseFast): Frame Time (Min - Max): 22 - 31 Avg. Time (Min - Max): 26.68868 - 30.67742

Lion (New | ReleaseFast): Frame Time (Min - Max): 19 - 27 Avg. Time (Min - Max): 21.70513 - 23.67742

Lion (Prev | Debug): Frame Time (Min - Max): 106 - 142 Avg. Time (Min - Max): 122.10526 - 128.07500

Lion (New | Debug): Frame Time (Min - Max): 92 - 118 Avg. Time (Min - Max): 107.01357 - 112.09677

Note: There wasn't any (apparent) performance improvement from using new datastructure compared to used zigimg directly. Most of the improvements is from moving image operation (normal map [0, 1] -> [-1, 1] and albedo's srgb -> linear) conversions.