Nora is a simple rendering engine for 2D and 3D applications, using OpenGL and GLFW. It is targeted for desktop PCs and browsers (WebGL).
Nora is not intended to be a fully-fledged game engine.
It is designed to be a minimalistic framework/library for quickly getting something to the screen, while maintaining good performance and low-level access to OpenGL functionality.
Nora is still under development and tries to mainly cover my own use-cases (at least for now).
Licence: GNU GPLv3 (for now), if not stated otherwise.
Nora uses github.com/maja42/gl to direct all OpenGL calls into a dedicated render thread. This means that nora supports concurrency and can be used from multiple go-routines simultaneously.
Note, however, that OpenGL calls are serialized and forwarded to the render thread to be executed asynchronously. The render-thread is only synchronized with the render-loop at specific points (end of frame, or when waiting for data from OpenGL calls).
Other engine objects (eg. meshes) are not concurrency-safe due to performance reasons. If they are accessed concurrently, synchronization primitives need to be used accordingly.
Exception 0xc0000005: If the application crashes or exits with this error code, it is very likely that engine objects
(and their underlying OpenGL objects) were accessed concurrently.
It often comes with the error message "signal arrived during external code execution", which indicates that the underlying cgo code
caused a segmentation fault due to invalid ordering of OpenGL calls. It can be fixed by proper synchronization.