Rich Geldreich

BBCSDL. BBC BASIC for SDL 2.0: for Windows, Linux (86), MacOS, Raspberry Pi, Android and iOS.

dxtex. DirectX Texture Tool (dxtex.exe) is an MFC-based application for viewing, manipulating, and building DDS textures for DirectX applications.

codebase-memory-mcp. High-performance code intelligence MCP server. Indexes codebases into a persistent knowledge graph — average repo in milliseconds. 158 languages, sub-ms queries, 99% fewer tokens. Single static binary, zero dependencies.

WickedEngine. 3D engine with modern graphics

psnr_hvsm. Accelerated Python package for computing the PSNR-HVS-M image metric

webp. Pure Go encoder and decoder for the webp

gowebper. Encode images to lossless WebP (VP8L) in pure Go. No CGo, no external dependencies. Single Level option from 0 (fastest) to 9 (smallest).

astc_decomp. ASTC decompresser for PIL

tiny_dds. Tiny DDS loader/saver based on

pdn-ddsfiletype-plus. A Paint.NET filetype plugin that adds support for some of the DDS formats introduced in DirectX 10 and later.

FasTC. A fast texture compressor for various formats

oastc. C++

float-hacks. Floating Point Hacks

PSNR-HVS-M-for-python. A python implementation of PSNR that takes the Human visual system into account.

S3TConv. Load-time conversion of S3 Texture Compression textures to other formats

astc-encoder. The Arm ASTC Encoder, a compressor for the Adaptive Scalable Texture Compression data format.

bc7e-on-gpu. An attempt to port BC7E texture compressor to a GPU compute shader

YouTubeAlchemy. This userscript for YouTube offers 200+ layout changes and features such as tab view, speed control, export transcripts, square design, auto-theater mode, and much more—all easily customizable via settings panels.

nuforc-ufo-records. For Fun: National UFO Reporting Center UFO Events

dos-bcdemos. Retro programming in Borland C++ 3.1

emu2. Simple x86 and DOS emulator for the Linux terminal.

DriveWire. The official home of DriveWire.

VgaPico. C

CoCoEPROMpak. 4k-64k EPROM-based Cartridge for Tandy/TRS-80 Color Computer

WebGPU-Ocean. A real-time 3D fluid simulation implemented in WebGPU

Altair-BASIC. Micro-Soft Altair BASIC 3.2 source

PWMSE. [TBC'20]Perceptually Weighted Mean Squared Error Based Rate-Distortion Optimization for HEVC

SSIM. Single file, high quality SSIM implementations in C++ and C#

vk_minimal_latest. A minimal, self-contained example demonstrating best practices for Vulkan development in a single file—no frameworks required.

vulkan-triangle-modern. Vulkan triangle in ~380 lines of code

krakensdr_pr. Passive Radar Code for the KrakenSDR

yt-dlp. A feature-rich command-line audio/video downloader

marker. Convert PDF to markdown + JSON quickly with high accuracy

Color-Utilities. RGB to XYZ Converter + RGB/XYZ to CIELAB Converter + Delta-E Calculator - Implemented in C++

ggweb. Template for C++ GUI apps that can run in the browser

cpp-channel. C++11 thread-safe container for sharing data between threads (synchronized queue)

pixie. Pixie - a minimal, cross-platform pixel framebuffer library for Windows and macOS.

fpng. Super fast C++ .PNG writer/reader

miniexr. Small code to write OpenEXR images

awesome-web-archiving. An Awesome List for getting started with web archiving

REI. REI is a cross-platform rendering framework and a comprehensive graphics API. Adaptable to various platforms, including PC, consoles, and mobile. It simplifies porting, especially for games developed on custom or proprietary engines. Functions as a cross-platform API as well as a helper library for platform-specific API.

STC. A modern, user friendly, generic, type-safe and fast C99 container library: String, Vector, Sorted and Unordered Map and Set, Deque, Forward List, Smart Pointers, Bitset and Random numbers.

minifb. MiniFB is a small cross platform library to create a frame buffer that you can draw pixels in

geocoder-js. GeocoderJS is the JavaScript equivalent of Geocoder PHP.

HDRImageViewer. UWP app to view high dynamic range (HDR) and wide color gamut (WCG) images.

millfork. Millfork: a middle-level programming language targeting 6502- and Z80-based microcomputers and home consoles

TheForceEngine. Modern "Jedi Engine" replacement supporting Dark Forces, mods, and in the future Outlaws.

Granite. My personal Vulkan renderer

colorspacious. A powerful, accurate, and easy-to-use Python library for doing colorspace conversions

png. Maintenance of the PNG specification

Goofy. Goofy - Realtime DXT1/ETC1 encoder

64.github.io. Delta blog

pcgeos. #FreeGEOS source codes. The offical home of the PC/GEOS operating system technology. For personal computing fans. For all developers and assembly lovers. For YOU!

GPURealTimeBC6H. Real-time BC6H compression on GPU

nuklear. A single-header ANSI C gui library

LTM. The local tone mapping algorithm based on histogram

OpenImageIO. Reading, writing, and processing images in a wide variety of file formats, using a format-agnostic API, aimed at VFX applications.

3b-hdr. Read/write Radiance HDR files

hdrview. A simple research-oriented image viewer with an emphasis on examining and comparing high-dynamic range (HDR) images.

LuminanceHDR. A complete workflow for HDR imaging

pu21. Perceptual Uniform encoding for image/video quality assessment (2021 revision)

tinyexr. Tiny EXR image loader/saver library

HxCModPlayer. A simple and lite MOD (music module) player.

PETSCIIRobots-Pet. Attack of the Petscii Robots - PET (Petscii Graphics)

tev. High dynamic range (HDR) image viewer for people who care about colors

rapidcsv. C++ CSV parser library

CalendarLib. A calendar date library that allows for creation of different date objects. These objects can then be manipulated and compared with operators (+,-,==, etc). It supports a variety of different calendars including Gregorian, Julian, Islamic, Hebrew and support for the Vulcan calendar is in the works. This project is written in C++ and comes with Boost unit tests included.

Orbit-Positions. Planet Positions for a given Julian Date using the 2-body approximation

juliandate. Simple conversions between Julian Dates and Julian/Gregorian calendar dates, supporting ancient dates

rapidfuzz-cpp. Rapid fuzzy string matching in C++ using the Levenshtein Distance

checkedc. Checked C is an extension to C that lets programmers write C code with bounds checking and improved type-safety. The goal is to let people easily make their existing C code type-safe and eliminate entire classes of errors.

UFOlogyNet. Work conducted to clean up and analyse the anonymous ufo timeline that came out of the July 26 Congressional hearings on the phenomena

darkreign2. Dark Reign 2

tiny-AES-c. Small portable AES128/192/256 in C

AESRand. Random Number Generator based on hardware-accelerated AES instructions

testingRNG. Testing common random-number generators (RNG)

hash-prospector. Automated integer hash function discovery

fast-hash. Fast hash function learned using genetic programming

wyhash. The FASTEST QUALITY hash function, random number generators (PRNG) and hash map.

pcg-c. PCG — C Implementation

pcg-c-basic. PCG — Minimal C Implementation

scratch. Personal scratch code

pdjson. C JSON parser library that doesn't suck

FPC. FPC - Fast Prefix Coder

portable-snippets. Collection of miscellaneous portable C snippets.

TDengine. High-performance, scalable time-series database designed for Industrial IoT (IIoT) scenarios

countbench. Benchmark for histograms of byte frequencies

cacm-ac-file. A modified version (fixed model calculation from file) of the arithmetic coding software by R.M. Neal.

Python-rANSCoder. A lightweight rANSCoder meant for rapid prototyping.

rans_static. rANS coder (derived from https://github.com/rygorous/ryg_rans)

yuvxyb. Direct conversions between YUV (YCbCr) and XYB colorspaces

lzbench. lzbench is an in-memory benchmark of open-source compressors

asap. A C++ header-only library for creating, displaying, iterating and manipulating dates

tinyformat. Minimal, type safe printf replacement library for C++

HandmadeMath. A simple math library for games and computer graphics. Compatible with both C and C++. Public domain and easy to modify.

Nuklear. A single-header ANSI C immediate mode cross-platform GUI library

linenoise. A small self-contained alternative to readline and libedit

utf8.h. 📚 single header utf8 string functions for C and C++

my_basic. A lightweight BASIC interpreter written in standard C in dual files. Aims to be embeddable, extendable and portable.

libs. Single-file public domain libraries for C/C++

fft. Public-domain single-header FFT library (power-of-2 size case only)

cro_lib. C

MikkTSpace. A common standard for tangent space used in baking tools to produce normal maps.

gif-h. Simple C++ one-header library for the creation of animated GIFs from image data.

sts. Single file library for vertex cache optimisation of triangles.

lightmapper. A C/C++ single-file library for drop-in lightmap baking. Just use your existing OpenGL renderer to bounce light!

debug-draw. Immediate-mode, renderer agnostic, lightweight debug drawing API.

immediate2d. A C++ drawing framework for Windows that makes simple graphics programming as fun and easy as the days when computers booted directly to a BASIC prompt

tigr. TIGR - the TIny GRaphics library for Windows, macOS, Linux, iOS and Android.

taming-transformers. Taming Transformers for High-Resolution Image Synthesis

bcdec. Small header-only C library to decompress any BC compressed image

ConvectionKernels. Fast, high-quality texture compression library for many formats

offalloc. Fast O(1) offset allocator with minimal fragmentation in C99

Terathon-Math-Library. C++ math library for 2D/3D/4D vector, matrix, quaternion, and geometric algebra.

StyleGANCpp. Unofficial implementation of StyleGAN's generator

fpng-python. Python bindings for fpng

Snake_AI_using_Neural_Network_and_Genetic_Algorithm. Implementation of Genetic Algorithm that autonomously plays snake game.

GeneticNeuralNetworkTraining. A Python implementation of a genetic optimizer for fully connected neural networks

cupscale. Image Upscaling GUI based on ESRGAN

qoir. A fast, simple, lossless image file format.

Zpng. Better lossless compression than PNG with a simpler algorithm

IntertwinedSpirals. This project was done as a part of COMP9444 Neural Networks and Deep Learning Course Project.

CppMultilayerPerceptron. A simple class for fully connected neural networks.

stable-diffusion. A latent text-to-image diffusion model

uap-data-vis-tool. A desktop application to import, standardise and visualise various UAP data sources.

tangle. Radically simple multiplayer / networked WebAssembly

ufobbs. archived text files from UFOBBS.com and script used to download them

wemap-meet-up.

natural-earth-vector. A global, public domain map dataset available at three scales and featuring tightly integrated vector and raster data.

Countries. Countries, Languages & Continents data (capital and currency, native name, calling codes).

cities.json. :cityscape: Cities of the world in Json, based on GeoNames Gazetteer

world-cities. List of major cities of the world as a datapackage

AgonLight. A stand-alone, BASIC-programmable microcontroller and microcomputer in one! The fastest, cheapest, most hackable 8-bit computer ever.

opengl-earth-simulation-gis. OpenGL Earth Simulation with GIS on Windows

simpleuv. Automatic UV Unwrapping Library for Dust3D

xatlas. Mesh parameterization / UV unwrapping library

strf. Yet another C++ text formatting library.

utf-cpp. UTF-8/16/32 C++11 header only library for Windows / Linux / macOS

ocr. An Optical Character Recognition software based on a simple neural network created from scratch in C.

pdfkit. A JavaScript PDF generation library for Node and the browser

pdf-to-markdown. A PDF to Markdown converter

english-words. :memo: A text file containing 479k English words for all your dictionary/word-based projects e.g: auto-completion / autosuggestion

uDb. UFO database reader

nuforc_sightings_data. Data collection and processing for the National UFO Reporting Center (NUFORC) database.

nanoGPT. The simplest, fastest repository for training/finetuning medium-sized GPTs.

minGPT. A minimal PyTorch re-implementation of the OpenAI GPT (Generative Pretrained Transformer) training

ufo-reports. NUFORC geolocated and time standardized ufo reports for close to a century of data. 80,000 plus reports.

SimpleJSON. SimpleJSON is a simple JSON library written in C++. It is designed to be simple to use and be cross platform.

imgui_markdown. Markdown for Dear ImGui

BorderlessWindow. basic win32 example of a borderless window (with aero shadows)

rdopt. Rdopt is a program to generate customized DCT quantization tables for use in JPEG compression.

prvhash. PRVHASH - Pseudo-Random-Value Hash. Hash functions, PRNG with unlimited period, randomness extractor, and a glimpse into abyss. (header-only C/C++) (Codename Gradilac/Градилак)

ReferenceMaterial.

task-opt1. Optimisation Task #1

nanoprintf. The smallest public printf implementation for its feature set.

raw_pdb. A C++11 library for reading Microsoft Program DataBase PDB files

kram. Encode/decode/info to KTX/KTX2/DDS files with LDR/HDR and BC/ASTC/ETC2. Mac/Win C++11 too, Mac viewer, and scripts for batch processing textures.

cpp-sort. Sorting algorithms & related tools for C++

imtui. ImTui: Immediate Mode Text-based User Interface C++ Library

qAverageColor. SIMD accelerated method to get the average color of an RGBA8 image

sjpeg. SimpleJPEG: simple jpeg encoder

Efficient-Compression-Tool. Fast and effective C++ file optimizer

lodepng. PNG encoder and decoder in C and C++.

fpnge. Demo of a fast PNG encoder.

miniz. miniz: Single C source file zlib-replacement library, originally from code.google.com/p/miniz

CppSPMD_Fast. Optimized CppSPMD test project: macro control flow, SSE4.1/AVX1/AVX2/AVX2 FMA support

entropy-coder. FSE (by Yann Collet) based naive entropy coder

libjxl. JPEG XL image format reference implementation

wuffs-mirror-release-c. C

FiniteStateEntropy. New generation entropy codecs : Finite State Entropy and Huff0

modern-cpp-features. A cheatsheet of modern C++ language and library features.

Turbo-Range-Coder. TurboRC - Fastest Range Coder + Arithmetic Coding / Fastest Asymmetric Numeral Systems

cuda-lzss. Cuda lzss compression

gpuhd. Massively Parallel Huffman Decoding on GPUs

GPU-lossless-compression. GPU-Accelerated Lossless Data Compressors Survey

libspng. Simple, modern libpng alternative

BitmapFonts. My collection of bitmap fonts pulled from various demoscene archives over the years

clhash. C library implementing the ridiculously fast CLHash hashing function

bas. Bas is an interpreter for the classic dialect of the programming language BASIC.

CRC. Fastest CRC32 for x86, Intel and AMD, + comprehensive derivation and discussion of various approaches

basis_universal. Basis Universal GPU Texture Codec

imagezero. Fast Lossless Color Image Compression Library

zpng. Better lossless compression than PNG with a simpler algorithm

implot. Immediate Mode Plotting

crc32. Fast CRC32

png-restart-marker. PNG Restart Marker Extension

parallel-png-proposal. Python

siliconcompiler. Modular hardware build system

mdec-tools. PlayStation1 MDEC compression tools

OpenCl-HelloWorld. Starting OpenCL on Visual Studio and It's Configuration

simde. Implementations of SIMD instruction sets for systems which don't natively support them.

gliml. Minimalistic image loader library for GL projects

CTPL. Modern and efficient C++ Thread Pool Library

GST. Generalized Texture Compression -- Aimed to provide GPU-decompress and higher compression rates.

UVAtlas. UVAtlas isochart texture atlas

image-datasets. A repository of public image data sets.

thekla_atlas. Texture atlas generation tool

pl_mpeg. Single file C library for decoding MPEG1 Video and MP2 Audio

libart. Adaptive Radix Trees implemented in C

kilo. A text editor in less than 1000 LOC with syntax highlight and search.