src/SDL_android.cpp
author Sam Lantinga <slouken@libsdl.org>
Thu, 06 Jan 2011 16:11:21 -0800
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child 4980 d9fdff945ec9
permissions -rw-r--r--
Build the SDL library as a shared object on Android, so it will work correctly with SDL_image and SDL_ttf.
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2010 Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Lesser General Public
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    License as published by the Free Software Foundation; either
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    version 2.1 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Lesser General Public License for more details.
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    You should have received a copy of the GNU Lesser General Public
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    License along with this library; if not, write to the Free Software
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    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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#include "SDL_config.h"
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/*******************************************************************************
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 This file links the Java side of Android with libsdl
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*******************************************************************************/
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#include <jni.h>
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#include <android/log.h>
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/*******************************************************************************
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                               Globals
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*******************************************************************************/
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JavaVM* mVM = NULL;
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JNIEnv* mEnv = NULL;
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JNIEnv* mAudioThreadEnv = NULL; //See the note below for why this is necessary
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//Main activity
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jclass mActivityInstance;
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//method signatures
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jmethodID midCreateGLContext;
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jmethodID midFlipBuffers;
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jmethodID midEnableFeature;
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jmethodID midUpdateAudio;
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extern "C" int Android_OnKeyDown(int keycode);
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extern "C" int Android_OnKeyUp(int keycode);
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extern "C" void Android_SetScreenResolution(int width, int height);
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extern "C" void Android_OnResize(int width, int height, int format);
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extern "C" int SDL_SendQuit();
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extern "C" void Android_EnableFeature(int featureid, bool enabled);
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//If we're not the active app, don't try to render
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bool bRenderingEnabled = false;
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//Feature IDs
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static const int FEATURE_AUDIO = 1;
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static const int FEATURE_ACCEL = 2;
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//Accelerometer data storage
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float fLastAccelerometer[3];
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/*******************************************************************************
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                 Functions called by JNI
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*******************************************************************************/
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// Library init
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extern "C" jint JNI_OnLoad(JavaVM* vm, void* reserved)
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{
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    mVM = vm;
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    return JNI_VERSION_1_4;
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}
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// Called before SDL_main() to initialize JNI bindings
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extern "C" void SDL_Android_Init(JNIEnv* env)
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{
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    mEnv = env;
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    __android_log_print(ANDROID_LOG_INFO, "SDL", "SDL_Android_Init()");
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    jclass cls = mEnv->FindClass ("org/libsdl/app/SDLActivity"); 
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    mActivityInstance = cls;
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    midCreateGLContext = mEnv->GetStaticMethodID(cls,"createGLContext","()V");
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    midFlipBuffers = mEnv->GetStaticMethodID(cls,"flipBuffers","()V");
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    midEnableFeature = mEnv->GetStaticMethodID(cls,"enableFeature","(II)V");
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    midUpdateAudio = mEnv->GetStaticMethodID(cls,"updateAudio","([B)V");
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    if(!midCreateGLContext || !midFlipBuffers || !midEnableFeature ||
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        !midUpdateAudio) {
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        __android_log_print(ANDROID_LOG_INFO, "SDL", "SDL: Bad mids\n");
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    } else {
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#ifdef DEBUG
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        __android_log_print(ANDROID_LOG_INFO, "SDL", "SDL: Good mids\n");
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#endif
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    }
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}
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// Keydown
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extern "C" void Java_org_libsdl_app_SDLActivity_onNativeKeyDown(JNIEnv* env, 
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               jobject obj, jint keycode)
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{
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    int r = Android_OnKeyDown(keycode);
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#ifdef DEBUG
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    __android_log_print(ANDROID_LOG_INFO, "SDL", 
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                        "SDL: native key down %d, %d\n", keycode, r);
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#endif
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}
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// Keyup
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extern "C" void Java_org_libsdl_app_SDLActivity_onNativeKeyUp(JNIEnv* env, 
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               jobject obj, jint keycode)
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{
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    int r = Android_OnKeyUp(keycode);
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#ifdef DEBUG
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    __android_log_print(ANDROID_LOG_INFO, "SDL", 
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                        "SDL: native key up %d, %d\n", keycode, r);
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#endif
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}
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// Touch
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extern "C" void Java_org_libsdl_app_SDLActivity_onNativeTouch(JNIEnv* env, 
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               jobject obj, jint action, jfloat x, jfloat y, jfloat p)
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{
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#ifdef DEBUG
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    __android_log_print(ANDROID_LOG_INFO, "SDL", 
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                        "SDL: native touch event %d @ %f/%f, pressure %f\n", 
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                        action, x, y, p);
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#endif
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    //TODO: Pass this off to the SDL multitouch stuff
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}
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// Quit
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extern "C" void Java_org_libsdl_app_SDLActivity_nativeQuit( JNIEnv*  env, 
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                                                                jobject obj )
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{    
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    // Stop rendering as we're no longer in the foreground
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    bRenderingEnabled = false;
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    // Inject a SDL_QUIT event
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    SDL_SendQuit();
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}
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// Screen size
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extern "C" void Java_org_libsdl_app_SDLActivity_nativeSetScreenSize(
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                JNIEnv*  env, jobject obj, jint width, jint height)
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{
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    __android_log_print(ANDROID_LOG_INFO, "SDL", 
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                        "SDL: Set screen size on init: %d/%d\n", width, height);
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    Android_SetScreenResolution(width, height);
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}
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// Resize
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extern "C" void Java_org_libsdl_app_SDLActivity_onNativeResize(
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                                        JNIEnv*  env, jobject obj, jint width, 
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                                        jint height, jint format)
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{
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    Android_OnResize(width, height, format);
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}
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extern "C" void Java_org_libsdl_app_SDLActivity_onNativeAccel(
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                                        JNIEnv*  env, jobject obj,
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                                        jfloat x, jfloat y, jfloat z)
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{
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    fLastAccelerometer[0] = x;
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    fLastAccelerometer[1] = y;
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    fLastAccelerometer[2] = z;   
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}
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/*******************************************************************************
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             Functions called by SDL into Java
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*******************************************************************************/
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extern "C" void Android_CreateContext()
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{
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    __android_log_print(ANDROID_LOG_INFO, "SDL", "SDL: sdl_create_context()\n");
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    bRenderingEnabled = true;
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    mEnv->CallStaticVoidMethod(mActivityInstance, midCreateGLContext ); 
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}
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extern "C" void Android_Render()
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{
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    if (!bRenderingEnabled) {
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        return;
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    }
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    // When we get here, we've accumulated a full frame    
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    mEnv->CallStaticVoidMethod(mActivityInstance, midFlipBuffers); 
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}
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extern "C" void Android_EnableFeature(int featureid, bool enabled)
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{
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    mEnv->CallStaticVoidMethod(mActivityInstance, midEnableFeature, 
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                                featureid, (int)enabled); 
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}
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extern "C" void Android_UpdateAudioBuffer(unsigned char *buf, int len)
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{
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    //Annoyingly we can't just call into Java from any thread. Because the audio
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    //callback is dispatched from the SDL audio thread (that wasn't made from
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    //java, we have to do some magic here to let the JVM know about the thread.
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    //Because everything it touches on the Java side is static anyway, it's 
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    //not a big deal, just annoying.
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    if(!mAudioThreadEnv) {
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        __android_log_print(ANDROID_LOG_INFO, "SDL", "SDL: Need to set up audio thread env\n");
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        mVM->AttachCurrentThread(&mAudioThreadEnv, NULL);
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        __android_log_print(ANDROID_LOG_INFO, "SDL", "SDL: ok\n");
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    }
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    jbyteArray arr = mAudioThreadEnv->NewByteArray(len);
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    //blah. We probably should rework this so we avoid the copy. 
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    mAudioThreadEnv->SetByteArrayRegion(arr, 0, len, (jbyte *)buf);
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    __android_log_print(ANDROID_LOG_INFO, "SDL", "SDL: copied\n");
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    mAudioThreadEnv->CallStaticVoidMethod(  mActivityInstance, 
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                                            midUpdateAudio, arr );
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    __android_log_print(ANDROID_LOG_INFO, "SDL", "SDL: invoked\n");
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}
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