Yocto/GL is a collection of single-file libraries for building physically-based graphics applications. Yocto/GL is written in C99 without dependencies and compiles on OSX (clang/gcc), Linux (clang/gcc) and Windows (cl).

• yocto_obj.h - Wavefront OBJ/MTL loader that supports arbitrary polygons (with/without triangulation), lines, and points. Includes optionals extensions for per-vertex color and radius, camera and environment map. Optionally depends on stb_image.h for texture loading.
• yocto_bvh.h - Ray casting of points, lines and triangles accelerated by a two-level bounding volume hierarchy.
• yocto_shape.h - Utilities for manipulating shapes composed of points, lines, triangles or quads. Includes parametric shape generation, uniform tesselation, normal computation, uniform shape sampling.
• yocto_trace.h - Path tracer with support for point, line or triangle geometry, mesh area lights and environment maps, materials with either GGX or Phong (only opaque for now). Support both incremental and offline computation on single- or multi-core machines.

• yocto_cmdline.h - Utilities for writing command line applications. Includes in particular a command line parsing library that support options and arguments of ints, floats, strings, enums.
• yocto_glu.h - Quick and dirty rendering of images and shapes in OpenGL, useful to create interactive viewers.
• yocto_math.h - A few vector math routines helpful to write test apps. This is not complete and not suitable for others use.

This repository contains Yocto/GL applications written to test the libraries. These are only considered demos and not part of the official release. But still they might be helpful to see how the Yocto/GL is used.

• ytestgen.c: Creates various test cases for the path tracer and GL viewer.
• yview.c: HDR/PNG/JPG image viewer with exposure/gamma tone mapping.
• yshade.c: OpenGL viewer.
• ytrace.c: Interactive path-tracer, that can also run in offline mode.

A few screenshots from ytrace are included here for demonstration.

Yocto/GL libraries are released under the permissive MIT license, while the example apps are released under the 2-clause BSD (to include warranty for binary distribution).