Mattéo Legagneux

Self-taught french programmer working on a custom game engine since 2022.

Resumes

• 
  EN ↗ • FR ↗

  Engine/Graphics Programmer

  August 2026
• 
  EN ↗ • FR ↗

  C++ Programmer

  August 2026
• 
  EN ↗

  Appendix

  August 2026

Letters of recommendation

• Quest Education Group (2026/05)

  Letter from Emilie Seccia, Educational Director of the Gaming Campus GTECH school, where I tutored a programming class in developing a custom C++ engine for their end-of-year project.

  FR ↗
• Tecken (2024)

  Letter from Hervé Crevan, Technical Director at Tecken and Educational Coordinator & Teacher at Diginamic, where I learned web, mobile and desktop application development.

  FR ↗

Work

Lightmapper

• Static geometry.
• Generated lightmap atlas.
• Custom model from PolyHaven.

C++ GPU lightmapper written with my RHI. There is no UV unwrapper, instead the lightmap UV are derived from the geometry's texture coordinates. The generated atlas is encoded as a QOI image and the UV are compressed into 2x 16-bit UNORM.

• Scene builder API for static geometry
• Custom model support
• Scene attributes (sky color, sun direction, sun intensity, etc.)
• Per-lightmap pixel scale
• Conservative rasterization using bias values
• Shadow leak fixing
• Two-pass bilateral filter
• Lightmap packing
• Fast bicubic interpolation

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Programming language

• Syntax for a simple vertex/fragment shader.

Custom C++ transpiler for a strongly-typed shader language. My goal is to have a unified solution instead of separate GLSL/HLSL shaders for everything.

• Lexical, syntactic and semantic analysis
• AST debugger
• GLSL code generator
• CLI tool similar to glslc
• LSP server with diagnostics and completion
• JSON parser

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Physics engine

2D and 3D rigid body physics in C++.

• Sequential Impulses
• Semi-Implicit Euler integration
• Friction
• Collision detection with SAT and GJK
• 2D joint constraints
• 2D warm starting
• 3D polygon clipping with Sutherland-Hodgman
• Experiments in 2D CCD

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SDF glyph map generator

• Text rendered with an SDF glyph map.
• Generated glyph map (spread factor = 7).

C++ building tool generating a signed distance field from a series of True-Type glyphs. Some artifacts are visible and there's still cleaning/optimizing work to be done.

• TTF decoder
• Compute glyph rasterizer
• Compute distance field generator
• Glyph packing

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GUI

• Various components.
• A list of interactive buttons.

Immediate C++ GUI API used for debug screens and option menus.

• Automatic layout computation
• Easy component extension with functional-style API
• Text, images and tinted rectangles
• Hover, focus, click and mouse down/up events
• UTF-8 decoder

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RHI

• Models from PolyHaven rendered with a PBR shader.

C++ graphics abstraction of OpenGL 4.6, Vulkan 1.0 and DirectX 12. No external dependencies outside of the API headers. Supports graphics, compute, GLSL/SPIR-V/HLSL, 2D textures, samplers, storage/uniform buffers, blending, depth-testing, viewport, scissor, buffer/image copy, indirect draw/dispatch, vertex attributes, render passes, descriptor sets, SRGB, synchronization, etc.

I used the RHI to implement a path tracer, a Forward renderer, a Visibility renderer, a GUI, a 2D physics visualizer, a lightmap baker, a glyph rasterizer and many samples to showcase the API.

• Stateless and explicit design to maximize user control
• Argument validation similar to the Vulkan validation layers
• 'Batched' and 'quick' memory allocations for Vulkan and DX12
• Linkage with custom Win32 window abstraction

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Logging library

Repository ↗ • Documentation ↗

Lightweight C++ library that supports console and file logging.

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Maths library

Repository ↗ • Documentation ↗

C++ SIMD vector maths library for computer graphics.