soft-3d-renderer

Software 3D Renderer

Features

• OBJ model import
• Depth buffering
• Texture mapping with bilinear filtering
• Lighting (ambient, diffuse, specular)
• Smooth shading

Goals

Implement basic GPU pipeline in software

To best learn what a GPU is doing, I wanted to recreate the functionality of the GPU in software. It’s not anywhere near as fast as a GPU of course, but it’s not slow either (for a single model that is relatively low-poly).

Good cache performance

The biggest bottleneck of modern CPU performance is latency between memory and the CPU, so I tried to use spatial and temporal locality to keep data in the cache. Although I chose to go for array-of-structs instead of struct-of-arrays, the cache miss rate is fairly low.

Minimal libraries

I created my own very basic OBJ loader (rather than use tinyobj) to better understand how OBJ files are constructed, along with their respective MTL files. I also wrote my own linear algebra functions and classes (rather than use glm) to better understand the low-level math operations.