src/core/android/SDL_android.cpp
author Sam Lantinga <slouken@libsdl.org>
Fri, 11 Feb 2011 22:37:15 -0800
changeset 5262 b530ef003506
parent 5222 c66b2a778b7e
child 5535 96594ac5fd1a
permissions -rw-r--r--
Happy 2011! :)
     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_libsdl_app_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_libsdl_app_SDLActivity_onNativeKeyDown(
   112                                     JNIEnv* env, jclass jcls, jint keycode)
   113 {
   114     Android_OnKeyDown(keycode);
   115 }
   116 
   117 // Keyup
   118 extern "C" void Java_org_libsdl_app_SDLActivity_onNativeKeyUp(
   119                                     JNIEnv* env, jclass jcls, jint keycode)
   120 {
   121     Android_OnKeyUp(keycode);
   122 }
   123 
   124 // Touch
   125 extern "C" void Java_org_libsdl_app_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_libsdl_app_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_libsdl_app_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_libsdl_app_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: */