src/core/android/SDL_android.cpp
author Sam Lantinga <slouken@libsdl.org>
Fri, 08 Apr 2011 13:03:26 -0700
changeset 5535 96594ac5fd1a
parent 5262 b530ef003506
child 5582 1281a3f1f0a6
permissions -rw-r--r--
SDL 1.3 is now under the zlib license.
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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2011 Sam Lantinga <slouken@libsdl.org>
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  This software is provided 'as-is', without any express or implied
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely, subject to the following restrictions:
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  1. The origin of this software must not be misrepresented; you must not
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     claim that you wrote the original software. If you use this software
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     in a product, an acknowledgment in the product documentation would be
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     appreciated but is not required.
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  2. Altered source versions must be plainly marked as such, and must not be
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     misrepresented as being the original software.
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  3. This notice may not be removed or altered from any source distribution.
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*/
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#include "SDL_config.h"
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#include "SDL_stdinc.h"
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#include "SDL_android.h"
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extern "C" {
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#include "../../events/SDL_events_c.h"
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#include "../../video/android/SDL_androidkeyboard.h"
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#include "../../video/android/SDL_androidtouch.h"
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#include "../../video/android/SDL_androidvideo.h"
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/* Impelemented in audio/android/SDL_androidaudio.c */
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extern void Android_RunAudioThread();
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} // C
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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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static JNIEnv* mEnv = NULL;
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static JNIEnv* mAudioEnv = NULL;
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// Main activity
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static jclass mActivityClass;
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// method signatures
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static jmethodID midCreateGLContext;
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static jmethodID midFlipBuffers;
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static jmethodID midAudioInit;
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static jmethodID midAudioWriteShortBuffer;
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static jmethodID midAudioWriteByteBuffer;
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static jmethodID midAudioQuit;
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// Accelerometer data storage
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static 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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    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, jclass cls)
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{
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    __android_log_print(ANDROID_LOG_INFO, "SDL", "SDL_Android_Init()");
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    mEnv = env;
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    mActivityClass = cls;
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    midCreateGLContext = mEnv->GetStaticMethodID(mActivityClass,
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                                "createGLContext","(II)Z");
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    midFlipBuffers = mEnv->GetStaticMethodID(mActivityClass,
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                                "flipBuffers","()V");
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    midAudioInit = mEnv->GetStaticMethodID(mActivityClass, 
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                                "audioInit", "(IZZI)Ljava/lang/Object;");
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    midAudioWriteShortBuffer = mEnv->GetStaticMethodID(mActivityClass,
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                                "audioWriteShortBuffer", "([S)V");
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    midAudioWriteByteBuffer = mEnv->GetStaticMethodID(mActivityClass,
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                                "audioWriteByteBuffer", "([B)V");
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    midAudioQuit = mEnv->GetStaticMethodID(mActivityClass,
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                                "audioQuit", "()V");
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    if(!midCreateGLContext || !midFlipBuffers || !midAudioInit ||
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       !midAudioWriteShortBuffer || !midAudioWriteByteBuffer || !midAudioQuit) {
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        __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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}
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// Resize
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extern "C" void Java_org_libsdl_app_SDLActivity_onNativeResize(
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                                    JNIEnv* env, jclass jcls,
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                                    jint width, jint height, jint format)
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{
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    Android_SetScreenResolution(width, height, format);
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}
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// Keydown
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extern "C" void Java_org_libsdl_app_SDLActivity_onNativeKeyDown(
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                                    JNIEnv* env, jclass jcls, jint keycode)
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{
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    Android_OnKeyDown(keycode);
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}
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// Keyup
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extern "C" void Java_org_libsdl_app_SDLActivity_onNativeKeyUp(
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                                    JNIEnv* env, jclass jcls, jint keycode)
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{
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    Android_OnKeyUp(keycode);
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}
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// Touch
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extern "C" void Java_org_libsdl_app_SDLActivity_onNativeTouch(
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                                    JNIEnv* env, jclass jcls,
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                                    jint action, jfloat x, jfloat y, jfloat p)
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{
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    Android_OnTouch(action, x, y, p);
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}
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// Accelerometer
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extern "C" void Java_org_libsdl_app_SDLActivity_onNativeAccel(
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                                    JNIEnv* env, jclass jcls,
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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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// Quit
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extern "C" void Java_org_libsdl_app_SDLActivity_nativeQuit(
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                                    JNIEnv* env, jclass cls)
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{    
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    // Inject a SDL_QUIT event
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    SDL_SendQuit();
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}
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extern "C" void Java_org_libsdl_app_SDLActivity_nativeRunAudioThread(
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                                    JNIEnv* env, jclass cls)
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{
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    /* This is the audio thread, with a different environment */
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    mAudioEnv = env;
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    Android_RunAudioThread();
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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" SDL_bool Android_JNI_CreateContext(int majorVersion, int minorVersion)
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{
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    if (mEnv->CallStaticBooleanMethod(mActivityClass, midCreateGLContext, majorVersion, minorVersion)) {
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        return SDL_TRUE;
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    } else {
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        return SDL_FALSE;
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    }
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}
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extern "C" void Android_JNI_SwapWindow()
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{
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    mEnv->CallStaticVoidMethod(mActivityClass, midFlipBuffers); 
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}
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extern "C" void Android_JNI_SetActivityTitle(const char *title)
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{
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    jmethodID mid;
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    mid = mEnv->GetStaticMethodID(mActivityClass,"setActivityTitle","(Ljava/lang/String;)V");
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    if (mid) {
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        mEnv->CallStaticVoidMethod(mActivityClass, mid, mEnv->NewStringUTF(title));
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    }
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}
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extern "C" void Android_JNI_GetAccelerometerValues(float values[3])
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{
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    int i;
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    for (i = 0; i < 3; ++i) {
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        values[i] = fLastAccelerometer[i];
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    }
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}
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//
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// Audio support
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//
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static jboolean audioBuffer16Bit = JNI_FALSE;
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static jboolean audioBufferStereo = JNI_FALSE;
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static jobject audioBuffer = NULL;
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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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{
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    int audioBufferFrames;
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    __android_log_print(ANDROID_LOG_VERBOSE, "SDL", "SDL audio: opening device");
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    audioBuffer16Bit = is16Bit;
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    audioBufferStereo = channelCount > 1;
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    audioBuffer = mEnv->CallStaticObjectMethod(mActivityClass, midAudioInit, sampleRate, audioBuffer16Bit, audioBufferStereo, desiredBufferFrames);
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    if (audioBuffer == NULL) {
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        __android_log_print(ANDROID_LOG_WARN, "SDL", "SDL audio: didn't get back a good audio buffer!");
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        return 0;
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    }
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    audioBuffer = mEnv->NewGlobalRef(audioBuffer);
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    jboolean isCopy = JNI_FALSE;
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    if (audioBuffer16Bit) {
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        audioBufferPinned = mEnv->GetShortArrayElements((jshortArray)audioBuffer, &isCopy);
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        audioBufferFrames = mEnv->GetArrayLength((jshortArray)audioBuffer);
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    } else {
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        audioBufferPinned = mEnv->GetByteArrayElements((jbyteArray)audioBuffer, &isCopy);
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        audioBufferFrames = mEnv->GetArrayLength((jbyteArray)audioBuffer);
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    }
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    if (audioBufferStereo) {
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        audioBufferFrames /= 2;
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    }
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    return audioBufferFrames;
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}
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extern "C" void * Android_JNI_GetAudioBuffer()
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{
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    return audioBufferPinned;
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}
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extern "C" void Android_JNI_WriteAudioBuffer()
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{
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    if (audioBuffer16Bit) {
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        mAudioEnv->ReleaseShortArrayElements((jshortArray)audioBuffer, (jshort *)audioBufferPinned, JNI_COMMIT);
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        mAudioEnv->CallStaticVoidMethod(mActivityClass, midAudioWriteShortBuffer, (jshortArray)audioBuffer);
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    } else {
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        mAudioEnv->ReleaseByteArrayElements((jbyteArray)audioBuffer, (jbyte *)audioBufferPinned, JNI_COMMIT);
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        mAudioEnv->CallStaticVoidMethod(mActivityClass, midAudioWriteByteBuffer, (jbyteArray)audioBuffer);
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    }
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    /* JNI_COMMIT means the changes are committed to the VM but the buffer remains pinned */
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}
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extern "C" void Android_JNI_CloseAudioDevice()
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{
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    mEnv->CallStaticVoidMethod(mActivityClass, midAudioQuit); 
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    if (audioBuffer) {
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        mEnv->DeleteGlobalRef(audioBuffer);
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        audioBuffer = NULL;
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        audioBufferPinned = NULL;
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    }
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}
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