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https://github.com/libgdx/gdx-jnigen
jnigen is a small library that can be used with or without libGDX which allows C/C++ code to be written inline with Java source code.
https://github.com/libgdx/gdx-jnigen
gradle java jni
Last synced: about 1 month ago
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jnigen is a small library that can be used with or without libGDX which allows C/C++ code to be written inline with Java source code.
- Host: GitHub
- URL: https://github.com/libgdx/gdx-jnigen
- Owner: libgdx
- License: apache-2.0
- Created: 2019-06-02T21:24:20.000Z (over 5 years ago)
- Default Branch: master
- Last Pushed: 2024-10-18T19:39:08.000Z (about 2 months ago)
- Last Synced: 2024-10-21T00:18:26.960Z (about 2 months ago)
- Topics: gradle, java, jni
- Language: Java
- Homepage:
- Size: 1.11 MB
- Stars: 62
- Watchers: 23
- Forks: 25
- Open Issues: 2
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGES
- License: LICENSE
- Codeowners: .github/CODEOWNERS
- Authors: AUTHORS
Awesome Lists containing this project
- awesome-libgdx - gdx-jnigen - Small library that allows C/C++ code to be written inline with Java source code. (Resources / Others)
README
## gdx-jnigen
[](https://github.com/libgdx/gdx-jnigen/actions?query=workflow%3A"Build+and+deploy")
The gdx-jnigen tool can be used with or without libGDX to allow C/C++ code to be written inline
with Java source code.
This increases the locality of code that conceptually belongs together (the Java native class methods and the actual implementation) and makes refactoring a lot easier
compared to the usual JNI workflow. Arrays and direct buffers are converted for you, further
reducing boilerplate. Building the natives for Windows, Linux, macOS, and Android and iOS is handled for
you. jnigen also provides a mechanism for loading native libraries from a JAR at runtime, which
avoids "java.library.path" troubles.
See the libGDX Wiki for usage: https://libgdx.com/wiki/utils/jnigen
## gdx-jnigen-gradle quickstart
We recommend you look at some existing projects for examples:
- [gdx](https://github.com/libgdx/libgdx/blob/master/gdx/build.gradle) (Uses jnigen 2.x)
- [gdx-freetype](https://github.com/libgdx/libgdx/blob/master/extensions/gdx-freetype/build.gradle) (Uses jnigen 2.x)
- [gdx-bullet](https://github.com/libgdx/libgdx/blob/master/extensions/gdx-bullet/build.gradle) (Uses jnigen 2.x)
- [gdx-video-desktop](https://github.com/libgdx/gdx-video/blob/master/gdx-video-desktop/build.gradle) (Uses jnigen 2.x)
- [Jamepad](https://github.com/libgdx/Jamepad/blob/master/build.gradle) (Uses jnigen 2.x)
## Configuring
```gradle
// Apply jnigen plugin
plugins {
id "com.badlogicgames.jnigen.jnigen-gradle"
}
// ...
// Define jnigen extension
jnigen {
// Your shared library name
sharedLibName = "example"
//Enable multi threading compilation
multiThreadedCompile = true
// Shared configuration for all BuildTargets. Executed first
// See all BuildTarget options here: https://github.com/libgdx/gdx-jnigen/blob/master/gdx-jnigen/src/main/java/com/badlogic/gdx/jnigen/BuildTarget.java
// Most paths are relative to the $jniDir directory
// String options can be replaced by using `x = "value"` or appended to with `x += "extravalue"`
// String[] options can be replaced by using `x = ["value"]` or appended to with `x += "extravalue"` or `x += ["extravalue", "extravalue2"]`
all {
// Add extra flags passed to the C compiler
cFlags += " -fvisibility=hidden "
// Add extra flags passed to the C++ compiler
cppFlags += " -std=c++11 -fvisibility=hidden "
// Add extra flags passed to the linker
linkerFlags += " -fvisibility=hidden "
}
// Configure robovm.xml for IOS builds, most simple libraries will not need to do this
robovm {
// Use preexisting robovm.xml, cannot be combined with other options.
//manualFile file("robovm.xml")
// Add extra patterns to forceLinkClasses
//forceLinkClasses "test", "test2"
//forceLinkClasses "pattern3"
// Add extra library "test.a" with variant "device"
//extraLib "test.a", "device"
//extraXCFramework "libs/test.xcframework"
}
// Add BuildTargets
// All BuildTarget options can be further customized in an OS+Arch specific manner within a {} block
// Add windows 32-bit BuildTarget and customize it
addWindows(x32, x86) {
//cFlags += " -fextraflag=fake "
//compilerPrefix = "someprefix-";
//cIncludes += "windowsspecificdir/*.c"
}
//Add windows 64 bit, x86, MSVC toolchain
addWindows(x64, x86, MSVC) {
msvcPreLinkerFlags += "/MD"
}
addWindows(x64, x86)
addLinux(x32, x86)
addLinux(x64, x86)
addLinux(x32, ARM)
addLinux(x64, ARM)
addMac(x64, x86)
addMac(x64, ARM)
//Auto add all possible ABIs
addAndroid() {
// Add extra content to the generated Application.mk file
//androidApplicationMk += ["APP_STL := c++_static"]
}
//Add specific android ABI
addAndroid(AndroidABI.ABI_ARM64_V8A)
//Auto add all possible iOS targets, including sim
addIOS() {
// Define ios framework bundle identifier
// xcframeworkBundleIdentifier = "com.badlogic.gdx.JniGen
// Deinfe minimum supported iOS version
// minIOSVersion = "11.0"
}
//Add specific ios device target
addIOS(x64, ARM, DEVICE)
//Add ios 64 bit x86 simulator target
addIOS(x64, x86, SIMULATOR)
// Customize each BuildTarget that matches the condition
each({ it.os != Android && !it.isARM }) {
//cppFlags += " -march=nocona "
}
// Customize everything again, can be used for conditional changes
each({ true }) {
//if(!it.cppCompiler.contains("clang")) {
// it.cFlags += " -flto "
// it.cppFlags += " -flto "
// it.linkerFlags += " -flto "
//}
//if(it.cppCompiler.contains("clang"))
// it.linkerFlags += " -Wl,-dead_strip -Wl,-s "
//else
// it.linkerFlags += " -Wl,--gc-sections "
}
}
```
## Building
After the Gradle plugin is configured, jnigen will automatically generate and register
appropriate tasks for building.
### Generation
`jnigen`
Required to be run before any other jnigen tasks, must be run any time source is changed
or config is changed
e.g. `./gradlew jnigen`
### Compilation
`jnigenBuildXXX`
Execute the native compilation for the targets you want. Replace `XXX` with the target name.
e.g. `./gradlew jnigenBuildAllWindows` Build all windows targets
e.g. `./gradlew jnigenBuildLinuxArm_64` Build the 64-bit ARM Linux target only
### Packaging
`jnigenPackageXXX`
Package the native libraries into a jar. Replace `XXX` with the target name.
e.g. `./gradlew jnigenPackageAll` Package all targets into their jars
e.g. `./gradlew jnigenPackageAllIOS` Package the iOS targets into their jar
e.g. `./gradlew jnigenPackageAllAndroid` Package the Android targets into their jars
### Publishing
Jnigen automatically generates publishing tasks that integrate with the maven publishing plugin.
If you are setup to publish to a maven repository, you can simply run:
`./gradlew publish`
Your artifacts will be published using `groupid:artifactid-platform:version:classifierXXX` as the coordinates.
replace classifierXXX with the target name.
e.g. natives-desktop, natives-ios, natives-android-arm64-v8a