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IrrlichtMt version 1.9
======================
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IrrlichtMt is the 3D engine of [Minetest ](https://github.com/minetest ).
It is based on the [Irrlicht Engine ](https://irrlicht.sourceforge.io/ ) but is now developed independently.
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It is intentionally not compatible to upstream and is planned to be eventually absorbed into Minetest.
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Build
-----
The build system is CMake.
The following libraries are required to be installed:
* zlib, libPNG, libJPEG
* OpenGL
* or on mobile: OpenGL ES (can be optionally enabled on desktop too)
* on Unix: X11
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* SDL2 (see below)
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Aside from standard search options (`ZLIB_INCLUDE_DIR`, `ZLIB_LIBRARY` , ...) the following options are available:
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* `BUILD_SHARED_LIBS` (default: `ON` ) - Build IrrlichtMt as a shared library
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* `BUILD_EXAMPLES` (default: `OFF` ) - Build example applications
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* `ENABLE_OPENGL` - Enable OpenGL driver
* `ENABLE_OPENGL3` (default: `OFF` ) - Enable OpenGL 3+ driver
* `ENABLE_GLES1` - Enable OpenGL ES driver, legacy
* `ENABLE_GLES2` - Enable OpenGL ES 2+ driver
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* `USE_SDL2` (default: platform-dependent, usually `ON` ) - Use SDL2 instead of older native device code
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e.g. on a Linux system you might want to build for local use like this:
git clone https://github.com/minetest/irrlicht
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cd irrlicht
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cmake . -DBUILD_SHARED_LIBS=OFF
make -j$(nproc)
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This will put an IrrlichtMtTargets.cmake file into the cmake directory in the current build directory, and it can then be imported from another project by pointing `find_package()` to the build directory, or by setting the `CMAKE_PREFIX_PATH` variable to that same path.
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on Windows system:
It is highly recommended to use vcpkg as package manager.
After you successfully built vcpkg you can easily install the required libraries:
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vcpkg install zlib libjpeg-turbo libpng sdl2 --triplet x64-windows
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Run the following script in PowerShell:
git clone https://github.com/minetest/irrlicht
cd irrlicht
cmake -B build -G "Visual Studio 17 2022" -A "Win64" -DCMAKE_TOOLCHAIN_FILE=[vcpkg-root]/scripts/buildsystems/vcpkg.cmake -DBUILD_SHARED_LIBS=OFF
cmake --build build --config Release
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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.
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.
