1 /*

     2     SDL - Simple DirectMedia Layer

     3     Copyright (C) 1997-2011 Sam Lantinga

     4 

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

     6     modify it under the terms of the GNU Lesser General Public

     7     License as published by the Free Software Foundation; either

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

     9 

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

    11     but WITHOUT ANY WARRANTY; without even the implied warranty of

    12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

    13     Lesser General Public License for more details.

    14 

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

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

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

    18 

    19     Sam Lantinga

    20     slouken@libsdl.org

    21 */

    22 #include "SDL_config.h"

    23 #include "SDL_stdinc.h"

    24 

    25 #include "SDL_android.h"

    26 

    27 extern "C" {

    28 #include "../../events/SDL_events_c.h"

    29 #include "../../video/android/SDL_androidkeyboard.h"

    30 #include "../../video/android/SDL_androidtouch.h"

    31 #include "../../video/android/SDL_androidvideo.h"

    32 

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

    34 extern void Android_RunAudioThread();

    35 } // C

    36 

    37 /*******************************************************************************

    38  This file links the Java side of Android with libsdl

    39 *******************************************************************************/

    40 #include <jni.h>

    41 #include <android/log.h>

    42 

    43 

    44 /*******************************************************************************

    45                                Globals

    46 *******************************************************************************/

    47 static JNIEnv* mEnv = NULL;

    48 static JNIEnv* mAudioEnv = NULL;

    49 

    50 // Main activity

    51 static jclass mActivityClass;

    52 

    53 // method signatures

    54 static jmethodID midCreateGLContext;

    55 static jmethodID midFlipBuffers;

    56 static jmethodID midAudioInit;

    57 static jmethodID midAudioWriteShortBuffer;

    58 static jmethodID midAudioWriteByteBuffer;

    59 static jmethodID midAudioQuit;

    60 

    61 // Accelerometer data storage

    62 static float fLastAccelerometer[3];

    63 

    64 

    65 /*******************************************************************************

    66                  Functions called by JNI

    67 *******************************************************************************/

    68 

    69 // Library init

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

    71 {

    72     return JNI_VERSION_1_4;

    73 }

    74 

    75 // Called before SDL_main() to initialize JNI bindings

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

    77 {

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

    79 

    80     mEnv = env;

    81     mActivityClass = cls;

    82 

    83     midCreateGLContext = mEnv->GetStaticMethodID(mActivityClass,

    84                                 "createGLContext","(II)Z");

    85     midFlipBuffers = mEnv->GetStaticMethodID(mActivityClass,

    86                                 "flipBuffers","()V");

    87     midAudioInit = mEnv->GetStaticMethodID(mActivityClass, 

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

    89     midAudioWriteShortBuffer = mEnv->GetStaticMethodID(mActivityClass,

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

    91     midAudioWriteByteBuffer = mEnv->GetStaticMethodID(mActivityClass,

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

    93     midAudioQuit = mEnv->GetStaticMethodID(mActivityClass,

    94                                 "audioQuit", "()V");

    95 

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

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

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

    99     }

   100 }

   101 

   102 // Resize

   103 extern "C" void Java_org_hedgewars_SDLActivity_onNativeResize(

   104                                     JNIEnv* env, jclass jcls,

   105                                     jint width, jint height, jint format)

   106 {

   107     Android_SetScreenResolution(width, height, format);

   108 }

   109 

   110 // Keydown

   111 extern "C" void Java_org_hedgewars_SDLActivity_onNativeKeyDown(

   112                                     JNIEnv* env, jclass jcls, jint keycode)

   113 {

   114     Android_OnKeyDown(keycode);

   115 }

   116 

   117 // Keyup

   118 extern "C" void Java_org_hedgewars_SDLActivity_onNativeKeyUp(

   119                                     JNIEnv* env, jclass jcls, jint keycode)

   120 {

   121     Android_OnKeyUp(keycode);

   122 }

   123 

   124 // Touch

   125 extern "C" void Java_org_hedgewars_SDLActivity_onNativeTouch(

   126                                     JNIEnv* env, jclass jcls,

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

   128 {

   129     Android_OnTouch(action, x, y, p);

   130 }

   131 

   132 // Accelerometer

   133 extern "C" void Java_org_hedgewars_SDLActivity_onNativeAccel(

   134                                     JNIEnv* env, jclass jcls,

   135                                     jfloat x, jfloat y, jfloat z)

   136 {

   137     fLastAccelerometer[0] = x;

   138     fLastAccelerometer[1] = y;

   139     fLastAccelerometer[2] = z;   

   140 }

   141 

   142 // Quit

   143 extern "C" void Java_org_hedgewars_SDLActivity_nativeQuit(

   144                                     JNIEnv* env, jclass cls)

   145 {    

   146     // Inject a SDL_QUIT event

   147     SDL_SendQuit();

   148 }

   149 

   150 extern "C" void Java_org_hedgewars_SDLActivity_nativeRunAudioThread(

   151                                     JNIEnv* env, jclass cls)

   152 {

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

   154     mAudioEnv = env;

   155 

   156     Android_RunAudioThread();

   157 }

   158 

   159 

   160 /*******************************************************************************

   161              Functions called by SDL into Java

   162 *******************************************************************************/

   163 extern "C" SDL_bool Android_JNI_CreateContext(int majorVersion, int minorVersion)

   164 {

   165     if (mEnv->CallStaticBooleanMethod(mActivityClass, midCreateGLContext, majorVersion, minorVersion)) {

   166         return SDL_TRUE;

   167     } else {

   168         return SDL_FALSE;

   169     }

   170 }

   171 

   172 extern "C" void Android_JNI_SwapWindow()

   173 {

   174     mEnv->CallStaticVoidMethod(mActivityClass, midFlipBuffers); 

   175 }

   176 

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

   178 {

   179     jmethodID mid;

   180 

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

   182     if (mid) {

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

   184     }

   185 }

   186 

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

   188 {

   189     int i;

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

   191         values[i] = fLastAccelerometer[i];

   192     }

   193 }

   194 

   195 //

   196 // Audio support

   197 //

   198 static jboolean audioBuffer16Bit = JNI_FALSE;

   199 static jboolean audioBufferStereo = JNI_FALSE;

   200 static jobject audioBuffer = NULL;

   201 static void* audioBufferPinned = NULL;

   202 

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

   204 {

   205     int audioBufferFrames;

   206 

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

   208     audioBuffer16Bit = is16Bit;

   209     audioBufferStereo = channelCount > 1;

   210 

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

   212 

   213     if (audioBuffer == NULL) {

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

   215         return 0;

   216     }

   217     audioBuffer = mEnv->NewGlobalRef(audioBuffer);

   218 

   219     jboolean isCopy = JNI_FALSE;

   220     if (audioBuffer16Bit) {

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

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

   223     } else {

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

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

   226     }

   227     if (audioBufferStereo) {

   228         audioBufferFrames /= 2;

   229     }

   230 

   231     return audioBufferFrames;

   232 }

   233 

   234 extern "C" void * Android_JNI_GetAudioBuffer()

   235 {

   236     return audioBufferPinned;

   237 }

   238 

   239 extern "C" void Android_JNI_WriteAudioBuffer()

   240 {

   241     if (audioBuffer16Bit) {

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

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

   244     } else {

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

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

   247     }

   248 

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

   250 }

   251 

   252 extern "C" void Android_JNI_CloseAudioDevice()

   253 {

   254     mEnv->CallStaticVoidMethod(mActivityClass, midAudioQuit); 

   255 

   256     if (audioBuffer) {

   257         mEnv->DeleteGlobalRef(audioBuffer);

   258         audioBuffer = NULL;

   259         audioBufferPinned = NULL;

   260     }

   261 }

   262 

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