IrrlichtMt is the 3D engine of Luanti. It is based on the Irrlicht Engine but is now developed independently. It is intentionally not compatible to upstream and is planned to be eventually absorbed into Luanti.

Build

The build system is CMake.

The following libraries are required to be installed:

zlib, libPNG, libJPEG
OpenGL or OpenGL ES
- a headless build is possible, but not very useful
SDL2 or SDL3 (see below)

Aside from standard search options (ZLIB_INCLUDE_DIR, ZLIB_LIBRARY, ...) the following options are available:

ENABLE_OPENGL - Enable legacy OpenGL driver
ENABLE_OPENGL3 - Enable OpenGL 3+ driver
ENABLE_GLES2 - Enable OpenGL ES 2+ driver
USE_SDL3 (default: OFF) - Use the SDL3 device instead of SDL2 (experimental)

However, IrrlichtMt cannot be built or installed separately.

Platforms

We aim to support these platforms:

Windows via MinGW
Linux (GL or GLES)
macOS
Android

This doesn't mean other platforms don't work or won't be supported, if you find something that doesn't work contributions are welcome.

Compatibility matrix

Driver (rows) vs Device (columns)

	SDL2 [1]	SDL3 [2]
OpenGL 1.2 (to 2.1)	Works	Testing
OpenGL 3.2+	Works	Works
OpenGL ES 2.x	Works	Testing
WebGL 1	?	?
Null (no graphics output)	Works	Works

Notes:

[1] CIrrDeviceSDL with USE_SDL3=0: supports many platforms
[2] CIrrDeviceSDL with USE_SDL3=1

License

The license of the Irrlicht Engine is based on the zlib/libpng license and applies to this fork, too.

The Irrlicht Engine License
===========================

Copyright (C) 2002-2012 Nikolaus Gebhardt

This software is provided 'as-is', without any express or implied
warranty.  In no event will the authors be held liable for any damages
arising from the use of this software.

Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely, subject to the following restrictions:

1. The origin of this software must not be misrepresented; you must not
 claim that you wrote the original software. If you use this software
 in a product, an acknowledgement in the product documentation would be
 appreciated but is not required.
2. Altered source versions must be clearly marked as such, and must not be
 misrepresented as being the original software.
3. This notice may not be removed or altered from any source distribution.