SoftRast

Hobby real-time software rasterizer, requires a CPU with AVX2/FMA.

The goal of the project is to learn more about the graphics pipeline, software rendering and SIMD programming.

Features:

• SIMD (AVX2) rasterization/shading.
• Perspective correct interpolation of attributes.
• Fixed point rasterization with 8 bits of sub pixel precision.
• Texture sampling with billinear interpolation and tiled/morton order textures.
• Multithreaded geometry processing and rasterization.
• Sort middle architecture.
• Reverse Z depth buffer (compile time toggleable).
• Mip mapping using screen space partial derivatives.
• No runtime memory allocation (all allocations go through thread local linear allocators with a large upfront allocation).
• Simple OBJ model loader. Creates a binary out of the model and textures for instantaneous loading after the first run.

Various improvements are in todo.txt.

Assorted references

• Some notes on Graphics Hardware
• A Parallel Algorithm for Polygon Rasterization
• A Sorting Classification of Parallel Rendering
• A Modern Approach to Software Rasterization
• Rasterization on Larabee
• Advanced Rasterization
• Texture tiling and swizzling
• A trip through the Graphics Pipeline
• Optimizing Software Occlusion Culling
• High-Performance Software Rasterization on GPUs
• Rasterization: a Practical Implementation
• MIP-map Level Selection for Texture Mapping