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Android: use 'RegisterNatives' to export the native methods

Browse Source 
"The advantages of RegisterNatives are that you get up-front checking
that the symbols exist, plus you can have smaller and faster shared
libraries by not exporting anything but JNI_OnLoad"

https://developer.android.com/training/articles/perf-jni#native-libraries
This commit is contained in:
Sylvain Becker 2019-12-12 18:38:36 +01:00
parent a613fc7cc2
commit 210f6dda95
1 changed files with 72 additions and 3 deletions
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75
src/core/android/SDL_android.c
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@ -147,9 +147,6 @@ JNIEXPORT void JNICALL SDL_JAVA_INTERFACE(nativeSetenv)(
JNIEnv *env, jclass cls,
jstring name, jstring value);
JNIEXPORT void JNICALL SDL_JAVA_INTERFACE(nativeEnvironmentVariablesSet)(
JNIEnv *env, jclass cls);
JNIEXPORT void JNICALL SDL_JAVA_INTERFACE(onNativeOrientationChanged)(
JNIEnv *env, jclass cls,
jint orientation);
@ -158,6 +155,35 @@ JNIEXPORT void JNICALL SDL_JAVA_INTERFACE(nativeAddTouch)(
JNIEnv* env, jclass cls,
jint touchId, jstring name);
static JNINativeMethod SDLActivity_tab[] = {
{ "nativeSetupJNI", "()I", SDL_JAVA_INTERFACE(nativeSetupJNI) },
{ "nativeRunMain", "(Ljava/lang/String;Ljava/lang/String;Ljava/lang/Object;)I", SDL_JAVA_INTERFACE(nativeRunMain) },
{ "onNativeDropFile", "(Ljava/lang/String;)V", SDL_JAVA_INTERFACE(onNativeDropFile) },
{ "nativeSetScreenResolution", "(IIIIIF)V", SDL_JAVA_INTERFACE(nativeSetScreenResolution) },
{ "onNativeResize", "()V", SDL_JAVA_INTERFACE(onNativeResize) },
{ "onNativeSurfaceCreated", "()V", SDL_JAVA_INTERFACE(onNativeSurfaceCreated) },
{ "onNativeSurfaceChanged", "()V", SDL_JAVA_INTERFACE(onNativeSurfaceChanged) },
{ "onNativeSurfaceDestroyed", "()V", SDL_JAVA_INTERFACE(onNativeSurfaceDestroyed) },
{ "onNativeKeyDown", "(I)V", SDL_JAVA_INTERFACE(onNativeKeyDown) },
{ "onNativeKeyUp", "(I)V", SDL_JAVA_INTERFACE(onNativeKeyUp) },
{ "onNativeSoftReturnKey", "()Z", SDL_JAVA_INTERFACE(onNativeSoftReturnKey) },
{ "onNativeKeyboardFocusLost", "()V", SDL_JAVA_INTERFACE(onNativeKeyboardFocusLost) },
{ "onNativeTouch", "(IIIFFF)V", SDL_JAVA_INTERFACE(onNativeTouch) },
{ "onNativeMouse", "(IIFFZ)V", SDL_JAVA_INTERFACE(onNativeMouse) },
{ "onNativeAccel", "(FFF)V", SDL_JAVA_INTERFACE(onNativeAccel) },
{ "onNativeClipboardChanged", "()V", SDL_JAVA_INTERFACE(onNativeClipboardChanged) },
{ "nativeLowMemory", "()V", SDL_JAVA_INTERFACE(nativeLowMemory) },
{ "nativeSendQuit", "()V", SDL_JAVA_INTERFACE(nativeSendQuit) },
{ "nativeQuit", "()V", SDL_JAVA_INTERFACE(nativeQuit) },
{ "nativePause", "()V", SDL_JAVA_INTERFACE(nativePause) },
{ "nativeResume", "()V", SDL_JAVA_INTERFACE(nativeResume) },
{ "nativeFocusChanged", "(Z)V", SDL_JAVA_INTERFACE(nativeFocusChanged) },
{ "nativeGetHint", "(Ljava/lang/String;)Ljava/lang/String;", SDL_JAVA_INTERFACE(nativeGetHint) },
{ "nativeSetenv", "(Ljava/lang/String;Ljava/lang/String;)V", SDL_JAVA_INTERFACE(nativeSetenv) },
{ "onNativeOrientationChanged", "(I)V", SDL_JAVA_INTERFACE(onNativeOrientationChanged) },
{ "nativeAddTouch", "(ILjava/lang/String;)V", SDL_JAVA_INTERFACE(nativeAddTouch) }
};
/* Java class SDLInputConnection */
JNIEXPORT void JNICALL SDL_JAVA_INTERFACE_INPUT_CONNECTION(nativeCommitText)(
JNIEnv *env, jclass cls,
@ -171,10 +197,20 @@ JNIEXPORT void JNICALL SDL_JAVA_INTERFACE_INPUT_CONNECTION(nativeSetComposingTex
JNIEnv *env, jclass cls,
jstring text, jint newCursorPosition);
static JNINativeMethod SDLInputConnection_tab[] = {
{ "nativeCommitText", "(Ljava/lang/String;I)V", SDL_JAVA_INTERFACE_INPUT_CONNECTION(nativeCommitText) },
{ "nativeGenerateScancodeForUnichar", "(C)V", SDL_JAVA_INTERFACE_INPUT_CONNECTION(nativeGenerateScancodeForUnichar) },
{ "nativeSetComposingText", "(Ljava/lang/String;I)V", SDL_JAVA_INTERFACE_INPUT_CONNECTION(nativeSetComposingText) }
};
/* Java class SDLAudioManager */
JNIEXPORT void JNICALL SDL_JAVA_AUDIO_INTERFACE(nativeSetupJNI)(
JNIEnv *env, jclass jcls);
static JNINativeMethod SDLAudioManager_tab[] = {
{ "nativeSetupJNI", "()I", SDL_JAVA_AUDIO_INTERFACE(nativeSetupJNI) }
};
/* Java class SDLControllerManager */
JNIEXPORT void JNICALL SDL_JAVA_CONTROLLER_INTERFACE(nativeSetupJNI)(
JNIEnv *env, jclass jcls);
@ -212,6 +248,17 @@ JNIEXPORT jint JNICALL SDL_JAVA_CONTROLLER_INTERFACE(nativeRemoveHaptic)(
JNIEnv *env, jclass jcls,
jint device_id);
static JNINativeMethod SDLControllerManager_tab[] = {
{ "nativeSetupJNI", "()I", SDL_JAVA_CONTROLLER_INTERFACE(nativeSetupJNI) },
{ "onNativePadDown", "(II)I", SDL_JAVA_CONTROLLER_INTERFACE(onNativePadDown) },
{ "onNativePadUp", "(II)I", SDL_JAVA_CONTROLLER_INTERFACE(onNativePadUp) },
{ "onNativeJoy", "(IIF)V", SDL_JAVA_CONTROLLER_INTERFACE(onNativeJoy) },
{ "onNativeHat", "(IIII)V", SDL_JAVA_CONTROLLER_INTERFACE(onNativeHat) },
{ "nativeAddJoystick", "(ILjava/lang/String;Ljava/lang/String;IIZIIII)I", SDL_JAVA_CONTROLLER_INTERFACE(nativeAddJoystick) },
{ "nativeRemoveJoystick", "(I)I", SDL_JAVA_CONTROLLER_INTERFACE(nativeRemoveJoystick) },
{ "nativeAddHaptic", "(ILjava/lang/String;)I", SDL_JAVA_CONTROLLER_INTERFACE(nativeAddHaptic) },
{ "nativeRemoveHaptic", "(I)I", SDL_JAVA_CONTROLLER_INTERFACE(nativeRemoveHaptic) }
};
/* Uncomment this to log messages entering and exiting methods in this file */
@ -424,10 +471,32 @@ Android_JNI_CreateKey_once(void)
}
}
static void
register_methods(JNIEnv *env, const char *classname, JNINativeMethod *methods, int nb)
{
jclass clazz = (*env)->FindClass(env, classname);
if (clazz == NULL || (*env)->RegisterNatives(env, clazz, methods, nb) < 0) {
__android_log_print(ANDROID_LOG_ERROR, "SDL", "Failed to register methods of %s", classname);
return;
}
}
/* Library init */
JNIEXPORT jint JNICALL JNI_OnLoad(JavaVM *vm, void *reserved)
{
mJavaVM = vm;
JNIEnv *env = NULL;
if ((*mJavaVM)->GetEnv(mJavaVM, (void **)&env, JNI_VERSION_1_4) != JNI_OK) {
__android_log_print(ANDROID_LOG_ERROR, "SDL", "Failed to get JNI Env");
return JNI_VERSION_1_4;
}
register_methods(env, "org/libsdl/app/SDLActivity", SDLActivity_tab, sizeof (SDLActivity_tab) / sizeof (SDLActivity_tab[0]));
register_methods(env, "org/libsdl/app/SDLInputConnection", SDLInputConnection_tab, sizeof (SDLInputConnection_tab) / sizeof (SDLInputConnection_tab[0]));
register_methods(env, "org/libsdl/app/SDLAudioManager", SDLAudioManager_tab, sizeof (SDLAudioManager_tab) / sizeof (SDLAudioManager_tab[0]));
register_methods(env, "org/libsdl/app/SDLControllerManager", SDLControllerManager_tab, sizeof (SDLControllerManager_tab) / sizeof (SDLControllerManager_tab[0]));
return JNI_VERSION_1_4;
}