FPS Advanced

A simple first-person shooter engine written in ~1200 lines of Zig, featuring brush-based geometry and BVH accelerated swept point-based collision detection with source-like movement including surfing.

Features

• First-person movement with mouse look and WASD controls
• Brush-based geometry using convex polyhedra for collision and rendering
• BVH spatial acceleration for efficient collision queries
• Quake-style physics with proper acceleration, friction, and air control
• Cross-platform graphics via Sokol (OpenGL, Metal, WebGL, WGSL)
• Audio system with background music and sound effects

Controls

• WASD - Move
• Mouse - Look around
• Space - Jump
• Escape - Toggle mouse lock

Building

Prerequisites

• Zig (latest)

Native Build

zig build run

Web Build

zig build -Dtarget=wasm32-emscripten

Architecture

• Physics - Collision detection with brush expansion and BVH traversal
• Rendering - Mesh generation from brush plane intersections
• Audio - 16-voice mixer with PCM file support
• Math - SIMD-optimized Vec3/Mat4 operations

The world consists of 8 brushes defining platforms, slopes, and structures. Each brush is a convex polyhedron represented by plane equations, enabling both collision detection and mesh generation from the same data.

Dependencies

• sokol - Cross-platform graphics
• cimgui - Immediate mode UI
• shdc - Shader compiler