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SDL_android.cpp
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/*
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"
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#include "SDL_android.h"
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extern "C" {
#include "events/SDL_events_c.h"
#include "video/android/SDL_androidkeyboard.h"
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#include "video/android/SDL_androidvideo.h"
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/* Impelemented in audio/android/SDL_androidaudio.c */
extern void Android_RunAudioThread();
} // C
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/*******************************************************************************
This file links the Java side of Android with libsdl
*******************************************************************************/
#include <jni.h>
#include <android/log.h>
/*******************************************************************************
Globals
*******************************************************************************/
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static JavaVM* mVM = NULL;
static JNIEnv* mEnv = NULL;
static JNIEnv* mAudioEnv = NULL;
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// Main activity
static jclass mActivityInstance;
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// method signatures
static jmethodID midCreateGLContext;
static jmethodID midFlipBuffers;
static jmethodID midAudioInit;
static jmethodID midAudioWriteShortBuffer;
static jmethodID midAudioWriteByteBuffer;
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static jmethodID midAudioQuit;
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// Accelerometer data storage
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float fLastAccelerometer[3];
/*******************************************************************************
Functions called by JNI
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*******************************************************************************/
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// Library init
extern "C" jint JNI_OnLoad(JavaVM* vm, void* reserved)
{
mVM = vm;
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return JNI_VERSION_1_4;
}
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// Called before SDL_main() to initialize JNI bindings
extern "C" void SDL_Android_Init(JNIEnv* env)
{
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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");
mActivityInstance = cls;
midCreateGLContext = mEnv->GetStaticMethodID(cls,"createGLContext","()V");
midFlipBuffers = mEnv->GetStaticMethodID(cls,"flipBuffers","()V");
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midAudioInit = mEnv->GetStaticMethodID(cls, "audioInit", "(IZZI)Ljava/lang/Object;");
midAudioWriteShortBuffer = mEnv->GetStaticMethodID(cls, "audioWriteShortBuffer", "([S)V");
midAudioWriteByteBuffer = mEnv->GetStaticMethodID(cls, "audioWriteByteBuffer", "([B)V");
midAudioQuit = mEnv->GetStaticMethodID(cls, "audioQuit", "()V");
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if(!midCreateGLContext || !midFlipBuffers || !midAudioInit ||
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!midAudioWriteShortBuffer || !midAudioWriteByteBuffer || !midAudioQuit) {
__android_log_print(ANDROID_LOG_WARN, "SDL", "SDL: Couldn't locate Java callbacks, check that they're named and typed correctly");
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}
}
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// Resize
extern "C" void Java_org_libsdl_app_SDLActivity_onNativeResize(
JNIEnv* env, jobject obj,
jint width, jint height, jint format)
{
Android_SetScreenResolution(width, height, format);
}
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extern "C" void Java_org_libsdl_app_SDLActivity_onNativeKeyDown(
JNIEnv* env, jobject obj, jint keycode)
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Android_OnKeyDown(keycode);
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}
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extern "C" void Java_org_libsdl_app_SDLActivity_onNativeKeyUp(
JNIEnv* env, jobject obj, jint keycode)
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Android_OnKeyUp(keycode);
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}
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extern "C" void Java_org_libsdl_app_SDLActivity_onNativeTouch(
JNIEnv* env, jobject obj,
jint action, jfloat x, jfloat y, jfloat p)
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#ifdef DEBUG
__android_log_print(ANDROID_LOG_INFO, "SDL",
"SDL: native touch event %d @ %f/%f, pressure %f\n",
action, x, y, p);
#endif
//TODO: Pass this off to the SDL multitouch stuff
}
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// Accelerometer
extern "C" void Java_org_libsdl_app_SDLActivity_onNativeAccel(
JNIEnv* env, jobject obj,
jfloat x, jfloat y, jfloat z)
{
fLastAccelerometer[0] = x;
fLastAccelerometer[1] = y;
fLastAccelerometer[2] = z;
}
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extern "C" void Java_org_libsdl_app_SDLActivity_nativeQuit(
JNIEnv* env, jobject obj)
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{
// Inject a SDL_QUIT event
SDL_SendQuit();
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}
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extern "C" void Java_org_libsdl_app_SDLActivity_nativeRunAudioThread(
JNIEnv* env)
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mVM->AttachCurrentThread(&mAudioEnv, NULL);
Android_RunAudioThread();
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}
/*******************************************************************************
Functions called by SDL into Java
*******************************************************************************/
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extern "C" void Android_JNI_CreateContext()
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mEnv->CallStaticVoidMethod(mActivityInstance, midCreateGLContext);
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}
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extern "C" void Android_JNI_SwapWindow()
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{
mEnv->CallStaticVoidMethod(mActivityInstance, midFlipBuffers);
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}
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//
// Audio support
//
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static jboolean audioBuffer16Bit = JNI_FALSE;
static jboolean audioBufferStereo = JNI_FALSE;
static jobject audioBuffer = NULL;
static void* audioBufferPinned = NULL;
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extern "C" int Android_JNI_OpenAudioDevice(int sampleRate, int is16Bit, int channelCount, int desiredBufferFrames)
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int audioBufferFrames;
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__android_log_print(ANDROID_LOG_VERBOSE, "SDL", "SDL audio: opening device");
audioBuffer16Bit = is16Bit;
audioBufferStereo = channelCount > 1;
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audioBuffer = mEnv->CallStaticObjectMethod(mActivityInstance, midAudioInit, sampleRate, audioBuffer16Bit, audioBufferStereo, desiredBufferFrames);
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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;
}
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return audioBufferFrames;
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extern "C" void * Android_JNI_GetAudioBuffer()
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//jboolean isCopy = JNI_FALSE;
//audioBufferPinned = mAudioEnv->GetPrimitiveArrayCritical((jarray)audioBuffer, &isCopy);
return audioBufferPinned;
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extern "C" void Android_JNI_WriteAudioBuffer()
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//mAudioEnv->ReleasePrimitiveArrayCritical((jarray)audioBuffer, audioBufferPinned, 0);
if (audioBuffer16Bit) {
mAudioEnv->ReleaseShortArrayElements((jshortArray)audioBuffer, (jshort *)audioBufferPinned, JNI_COMMIT);
mAudioEnv->CallStaticVoidMethod(mActivityInstance, midAudioWriteShortBuffer, (jshortArray)audioBuffer);
} else {
mAudioEnv->ReleaseByteArrayElements((jbyteArray)audioBuffer, (jbyte *)audioBufferPinned, JNI_COMMIT);
mAudioEnv->CallStaticVoidMethod(mActivityInstance, midAudioWriteByteBuffer, (jbyteArray)audioBuffer);
}
/* JNI_COMMIT means the changes are committed to the VM but the buffer remains pinned */
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}
extern "C" void Android_JNI_CloseAudioDevice()
{
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mEnv->CallStaticVoidMethod(mActivityInstance, midAudioQuit);
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mEnv->DeleteGlobalRef(audioBuffer);
audioBuffer = NULL;
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}
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/* vi: set ts=4 sw=4 expandtab: */