Iris — A Software Rasterizer in C

Iris is a fully functional software rasterizer written in C.
It implements the fundamentals of a 3D rendering pipeline without relying on external graphics libraries or hardware acceleration.

⚠️ Status: Work in Progress (WIP)
This project is under active development. Many features are incomplete or experimental.

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Features (Planned and Implemented)

• Perspective-correct projection using projection matrices
• Geometry and Models
• Camera and Transformations
• Loading and parsing OBJ files (vertices, faces, textures)
• Back-face culling
• Translation, scaling, and rotation matrices for world transforms
• Lighting and Shading
• Flat shading
• Texture loading and mapping (PNG loading using uPNG)
• Perspective-correct interpolation of UV coordinates
• Depth-based rendering using a Z-buffer
• Camera space and Movement
• Frustum clipping
• Rendering multiple meshes simultaneously

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TODO

🚧 This section lists upcoming changes and improvements targeted for the next minor version 🚧

• Refactoring and Code comments
• Texture mapping
• Implement PNG decoding
• Textured OBJ files
• Update painter's algorithm to Z-buffering

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Project Structure

iris/
├── assets/             # 3D models, textures, and other resource files
├── build/              # Compiled binaries (ignored by Git)
├── src/                # All source code for the renderer
├── .clang-format       # Code style configuration
├── .gitignore          # Untracked files
├── LICENSE             # Project license
├── Makefile            # Build script
└── README.md           # This file

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License

This project is licensed under the MIT License.