https://github.com/bytecode77/fastpix3d

Software Rasterizer (C++)
https://github.com/bytecode77/fastpix3d

rasterizer software-rasterizer stencil-shadows

Last synced: 7 months ago
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Software Rasterizer (C++)

• Host: GitHub
• URL: https://github.com/bytecode77/fastpix3d
• Owner: bytecode77
• License: bsd-2-clause
• Created: 2017-12-17T14:35:14.000Z (about 8 years ago)
• Default Branch: master
• Last Pushed: 2024-05-07T19:30:38.000Z (over 1 year ago)
• Last Synced: 2024-05-07T20:34:55.124Z (over 1 year ago)
• Topics: rasterizer, software-rasterizer, stencil-shadows
• Language: C
• Homepage: https://bytecode77.com/fastpix3d
• Size: 73.7 MB
• Stars: 30
• Watchers: 3
• Forks: 5
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE-OBJ-Loader.md

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README

          
# FastPix3D

## Software Rasterizer

FastPix3D is a **high-performance** software rasterizer written in C++.

With features akin to modern 3D engines - such as depth shadows, anisotropic mip mapping, cubemaps, and more - this project stands distinctly superior to other software rasterizers.

## Performance

The **block-based half-space** algorithm is aggressively optimized using **AVX2** and **multithreading**. Pixel shading is performed on 8 pixels at once using SIMD intrinsics.

C++ **template parameters** are used to implement **branchless** render states that would otherwise impose branches in the tight inner loops. As a result, render states add **zero overhead**.

## Screenshots

[![](/.github/screenshots/001.thumb.jpg)](/.github/screenshots/001.jpg)

[![](/.github/screenshots/002.thumb.jpg)](/.github/screenshots/002.jpg)

[![](/.github/screenshots/003.thumb.jpg)](/.github/screenshots/003.jpg)

[![](/.github/screenshots/004.thumb.jpg)](/.github/screenshots/004.jpg)

[![](/.github/screenshots/005.thumb.jpg)](/.github/screenshots/005.jpg)

[![](/.github/screenshots/006.thumb.jpg)](/.github/screenshots/006.jpg)

[![](/.github/screenshots/007.thumb.jpg)](/.github/screenshots/007.jpg)

[![](/.github/screenshots/008.thumb.jpg)](/.github/screenshots/008.jpg)

## Features

*Cool stuff you rarely see in software renderers — all in one place.*

### Depth shadows with PCF & cubemapping

FastPix3D renders **depth maps** from point light sources. **PCF** (percentage closer filtering) produces soft shadows.

[![](/.github/screenshots/pcf.jpg)](/.github/screenshots/pcf.jpg)

With **cubemap shadow map projection**, it is possible to implement true indoor shadows with full 360° coverage. This feature requires peak performance rasterization to be feasible.

### Anisotropic mip mapping & Texture filtering

**Anisotropic mip mapping** significantly reduces aliasing, at negligible performance cost. **Bilinear texture filtering**, combined with high frame rates, provides smooth and artifact-free visuals.

[![](/.github/screenshots/texture-filtering.jpg)](/.github/screenshots/texture-filtering.jpg)

## Full list of features

- Depth shadows

  - Point lights

  - Cubemap (6 shadow maps, full 360°)

  - PCF (percentage closer filtering)

- Textures

  - Anisotropic mip mapping

  - Bilinear filtering

  - Sphere mapping

  - Blend modes (alpha, multiply, add)

  - Per-pixel transparency key

- Vertex lighting with specular highlights

- Fog

- Wireframe

- Bitmap fonts

- Primitive generator (cube, sphere, cylinder, torus, etc.)

- Render to texture

## Performance optimizations

- Block-based half-space algorithm

  - Rendering 8 pixels at once using AVX2

  - Multithreading

  - Rasterization is almost fully branchless

- Branchless render states by leveraging C++ template parameters

- Perspective correction and mip mapping performed only once per 8x8 pixel block

- Optimizations from the architectural level down to micro-optimizations

## Downloads

All examples as compiled executables:

[![](http://bytecode77.com/public/fileicons/zip.png) FastPix3D 4.1.0.zip](/.github/downloads/FastPix3D%204.1.0.zip)