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hvcc (Heavy Compiler Collection)

Unity · Wwise · Engine-agnostic

hvcc is a compiler that translates Pure Data patches into optimized C/C++ source code and platform-specific wrappers. Originally developed to overcome performance limitations of libpd on mobile devices, it statically analyzes dataflow audio patches and generates low-level code that maintains the same behavior while taking advantage of modern hardware. The compiler supports multiple output targets including Unity plugins, Wwise integration, DPF plugins, DAW plugins, and embedded platforms like Daisy and OWL. It handles patch resolution, abstraction, and generates both C and C++ APIs with optional framework-specific scaffolding. Integrated into plugdata and several online build services, hvcc enables sound designers to work in Pure Data's visual environment while deploying to production environments that require native performance. The toolchain preserves patch semantics while producing portable, optimized implementations suitable for real-time audio processing.

Engine Sound Generator is a procedural audio synthesis tool that generates physically-modeled engine sounds using the Web Audio API. It implements waveguide-based synthesis techniques derived from research on physically informed car engine sound synthesis, simulating intake, exhaust, and engine block vibrations with configurable parameters like cylinder count, waveguide lengths, and reflection factors. The tool offers multiple implementations including a JavaScript AudioWorklet version and a WebAssembly-compiled version for improved performance. It integrates with Three.js for spatial audio positioning and includes Doppler effect simulation using DelayNodes. Parameters like RPM, muffler configurations, and individual component volumes can be adjusted in real-time. The WebAssembly version eliminates audio glitches present in pure JavaScript implementations while maintaining the same API surface. All synthesis is done procedurally without sample playback, making it suitable for dynamic vehicle simulations where engine characteristics need to change based on gameplay state.