Rasterizer

A lightweight C++20 software rasterizer with no third-party dependencies.

Features

• No External Libraries – Pure C++20 implementation.
• Deferred Rendering – Efficient lighting and shading.
• Global Illumination – Supports advanced techniques:
  • Reflective Shadow Maps (RSM)
  • Screen Space Reflections (SSR)
  • Screen Space Ambient Occlusion (SSAO)
• Texture Sampling – Supports uv coordinates.
• Normal Mapping – Enhances surface detail.
• Exponential Fog – Realistic atmospheric effects.
• Shadow Mapping – Real-time shadow rendering.
• Anti-Aliasing – High-quality edge smoothing.
  • Super Sampling Anti-Aliasing (SSAA)
  • Fast Approximate Anti-Aliasing (FXAA)
• Performance Optimization – Utilizes OpenMP and tile-based rendering.

Build

I can compile successfully on Windows using MSVC (VS 2022) and GCC (MinGW).

Visual Stduio 2022

cmake -G "Visual Studio 17 2022" -B build
cmake --build build --config Release

MinGW

cmake -G "MinGW Makefiles" -DCMAKE_BUILD_TYPE=Release -B build
cd build
mingw32-make.exe

The program uses std::cout to output in PPM (P3) format and outputs to a .ppm file using the following command line.

.\rasterizer.exe > xxx.ppm

Using 4x SSAA will cost more memory and time.

Terminal

4x SSAA: Off
Application Set Up: 0.0924653 seconds
Shadow Passes:      0.145654 seconds
Geometry Passes:    0.170903 seconds
SSAO Passes:        1.1425 seconds
Shading Pass:       1.21045 seconds
SSR Pass:           1.31 seconds
FXAA Pass:          1.43453 seconds
Done.

Sample Scenes

box(SSAA/FXAA/noAA)

pbr_test

rsm_test

License

This project is licensed under the MIT License.