/*

     SDL - Simple DirectMedia Layer

     Copyright (C) 1997-2010 Sam Lantinga

     This library is free software; you can redistribute it and/or

     modify it under the terms of the GNU Lesser General Public

     License as published by the Free Software Foundation; either

     version 2.1 of the License, or (at your option) any later version.

     This library is distributed in the hope that it will be useful,

     but WITHOUT ANY WARRANTY; without even the implied warranty of

     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

     Lesser General Public License for more details.

     You should have received a copy of the GNU Lesser General Public

     License along with this library; if not, write to the Free Software

     Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

     Sam Lantinga

     slouken@libsdl.org

 */

 #include "SDL_config.h"

 #include "SDL_android.h"

 extern "C" {

 #include "events/SDL_events_c.h"

 #include "video/android/SDL_androidkeyboard.h"

 #include "video/android/SDL_androidtouch.h"

 #include "video/android/SDL_androidvideo.h"

 /* Impelemented in audio/android/SDL_androidaudio.c */

 extern void Android_RunAudioThread();

 } // C

 /*******************************************************************************

  This file links the Java side of Android with libsdl

 *******************************************************************************/

 #include <jni.h>

 #include <android/log.h>

 /*******************************************************************************

                                Globals

 *******************************************************************************/

 static JNIEnv* mEnv = NULL;

 static JNIEnv* mAudioEnv = NULL;

 // Main activity

 static jclass mActivityClass;

 // method signatures

 static jmethodID midCreateGLContext;

 static jmethodID midFlipBuffers;

 static jmethodID midAudioInit;

 static jmethodID midAudioWriteShortBuffer;

 static jmethodID midAudioWriteByteBuffer;

 static jmethodID midAudioQuit;

 // Accelerometer data storage

 static float fLastAccelerometer[3];

 /*******************************************************************************

                  Functions called by JNI

 *******************************************************************************/

 // Library init

 extern "C" jint JNI_OnLoad(JavaVM* vm, void* reserved)

 {

     return JNI_VERSION_1_4;

 }

 // Called before SDL_main() to initialize JNI bindings

 extern "C" void SDL_Android_Init(JNIEnv* env, jclass cls)

 {

     __android_log_print(ANDROID_LOG_INFO, "SDL", "SDL_Android_Init()");

     mEnv = env;

     mActivityClass = cls;

     midCreateGLContext = mEnv->GetStaticMethodID(mActivityClass,

                                 "createGLContext","()V");

     midFlipBuffers = mEnv->GetStaticMethodID(mActivityClass,

                                 "flipBuffers","()V");

     midAudioInit = mEnv->GetStaticMethodID(mActivityClass, 

                                 "audioInit", "(IZZI)Ljava/lang/Object;");

     midAudioWriteShortBuffer = mEnv->GetStaticMethodID(mActivityClass,

                                 "audioWriteShortBuffer", "([S)V");

     midAudioWriteByteBuffer = mEnv->GetStaticMethodID(mActivityClass,

                                 "audioWriteByteBuffer", "([B)V");

     midAudioQuit = mEnv->GetStaticMethodID(mActivityClass,

                                 "audioQuit", "()V");

     if(!midCreateGLContext || !midFlipBuffers || !midAudioInit ||

        !midAudioWriteShortBuffer || !midAudioWriteByteBuffer || !midAudioQuit) {

         __android_log_print(ANDROID_LOG_WARN, "SDL", "SDL: Couldn't locate Java callbacks, check that they're named and typed correctly");

     }

 }

 // Resize

 extern "C" void Java_org_libsdl_app_SDLActivity_onNativeResize(

                                     JNIEnv* env, jclass jcls,

                                     jint width, jint height, jint format)

 {

     Android_SetScreenResolution(width, height, format);

 }

 // Keydown

 extern "C" void Java_org_libsdl_app_SDLActivity_onNativeKeyDown(

                                     JNIEnv* env, jclass jcls, jint keycode)

 {

     Android_OnKeyDown(keycode);

 }

 // Keyup

 extern "C" void Java_org_libsdl_app_SDLActivity_onNativeKeyUp(

                                     JNIEnv* env, jclass jcls, jint keycode)

 {

     Android_OnKeyUp(keycode);

 }

 // Touch

 extern "C" void Java_org_libsdl_app_SDLActivity_onNativeTouch(

                                     JNIEnv* env, jclass jcls,

                                     jint action, jfloat x, jfloat y, jfloat p)

 {

     Android_OnTouch(action, x, y, p);

 }

 // Accelerometer

 extern "C" void Java_org_libsdl_app_SDLActivity_onNativeAccel(

                                     JNIEnv* env, jclass jcls,

                                     jfloat x, jfloat y, jfloat z)

 {

     fLastAccelerometer[0] = x;

     fLastAccelerometer[1] = y;

     fLastAccelerometer[2] = z;   

 }

 // Quit

 extern "C" void Java_org_libsdl_app_SDLActivity_nativeQuit(

                                     JNIEnv* env, jclass cls)

 {    

     // Inject a SDL_QUIT event

     SDL_SendQuit();

 }

 extern "C" void Java_org_libsdl_app_SDLActivity_nativeRunAudioThread(

                                     JNIEnv* env, jclass cls)

 {

     /* This is the audio thread, with a different environment */

     mAudioEnv = env;

     Android_RunAudioThread();

 }

 /*******************************************************************************

              Functions called by SDL into Java

 *******************************************************************************/

 extern "C" void Android_JNI_CreateContext()

 {

     mEnv->CallStaticVoidMethod(mActivityClass, midCreateGLContext); 

 }

 extern "C" void Android_JNI_SwapWindow()

 {

     mEnv->CallStaticVoidMethod(mActivityClass, midFlipBuffers); 

 }

 extern "C" void Android_JNI_SetActivityTitle(const char *title)

 {

     jmethodID mid;

     mid = mEnv->GetStaticMethodID(mActivityClass,"setActivityTitle","(Ljava/lang/String;)V");

     if (mid) {

         mEnv->CallStaticVoidMethod(mActivityClass, mid, mEnv->NewStringUTF(title));

     }

 }

 extern "C" void Android_JNI_GetAccelerometerValues(float values[3])

 {

     int i;

     for (i = 0; i < 3; ++i) {

         values[i] = fLastAccelerometer[i];

     }

 }

 //

 // Audio support

 //

 static jboolean audioBuffer16Bit = JNI_FALSE;

 static jboolean audioBufferStereo = JNI_FALSE;

 static jobject audioBuffer = NULL;

 static void* audioBufferPinned = NULL;

 extern "C" int Android_JNI_OpenAudioDevice(int sampleRate, int is16Bit, int channelCount, int desiredBufferFrames)

 {

     int audioBufferFrames;

     __android_log_print(ANDROID_LOG_VERBOSE, "SDL", "SDL audio: opening device");

     audioBuffer16Bit = is16Bit;

     audioBufferStereo = channelCount > 1;

     audioBuffer = mEnv->CallStaticObjectMethod(mActivityClass, midAudioInit, sampleRate, audioBuffer16Bit, audioBufferStereo, desiredBufferFrames);

     if (audioBuffer == NULL) {

         __android_log_print(ANDROID_LOG_WARN, "SDL", "SDL audio: didn't get back a good audio buffer!");

         return 0;

     }

     audioBuffer = mEnv->NewGlobalRef(audioBuffer);

     jboolean isCopy = JNI_FALSE;

     if (audioBuffer16Bit) {

         audioBufferPinned = mEnv->GetShortArrayElements((jshortArray)audioBuffer, &isCopy);

         audioBufferFrames = mEnv->GetArrayLength((jshortArray)audioBuffer);

     } else {

         audioBufferPinned = mEnv->GetByteArrayElements((jbyteArray)audioBuffer, &isCopy);

         audioBufferFrames = mEnv->GetArrayLength((jbyteArray)audioBuffer);

     }

     if (audioBufferStereo) {

         audioBufferFrames /= 2;

     }

     return audioBufferFrames;

 }

 extern "C" void * Android_JNI_GetAudioBuffer()

 {

     return audioBufferPinned;

 }

 extern "C" void Android_JNI_WriteAudioBuffer()

 {

     if (audioBuffer16Bit) {

         mAudioEnv->ReleaseShortArrayElements((jshortArray)audioBuffer, (jshort *)audioBufferPinned, JNI_COMMIT);

         mAudioEnv->CallStaticVoidMethod(mActivityClass, midAudioWriteShortBuffer, (jshortArray)audioBuffer);

     } else {

         mAudioEnv->ReleaseByteArrayElements((jbyteArray)audioBuffer, (jbyte *)audioBufferPinned, JNI_COMMIT);

         mAudioEnv->CallStaticVoidMethod(mActivityClass, midAudioWriteByteBuffer, (jbyteArray)audioBuffer);

     }

     /* JNI_COMMIT means the changes are committed to the VM but the buffer remains pinned */

 }

 extern "C" void Android_JNI_CloseAudioDevice()

 {

     mEnv->CallStaticVoidMethod(mActivityClass, midAudioQuit); 

     if (audioBuffer) {

         mEnv->DeleteGlobalRef(audioBuffer);

         audioBuffer = NULL;

         audioBufferPinned = NULL;

     }

 }

 /* vi: set ts=4 sw=4 expandtab: */