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/*******************************************************************************
This file links the Java side of Android with libsdl
*******************************************************************************/
#include <jni.h>
#include <sys/time.h>
#include <time.h>
#include <android/log.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <pthread.h>
#define DEBUG
/*******************************************************************************
Globals
*******************************************************************************/
static long _getTime(void){
struct timeval now;
gettimeofday(&now, NULL);
return (long)(now.tv_sec*1000 + now.tv_usec/1000);
}
JNIEnv* mEnv = NULL;
JNIEnv* mAudioThreadEnv = NULL; //See the note below for why this is necessary
JavaVM* mVM = NULL;
//Main activity
jclass mActivityInstance;
//method signatures
jmethodID midCreateGLContext;
jmethodID midFlipBuffers;
jmethodID midEnableFeature;
jmethodID midUpdateAudio;
extern "C" int SDL_main();
extern "C" int Android_OnKeyDown(int keycode);
extern "C" int Android_OnKeyUp(int keycode);
extern "C" void Android_SetScreenResolution(int width, int height);
extern "C" void Android_OnResize(int width, int height, int format);
extern "C" int SDL_SendQuit();
extern "C" void Android_EnableFeature(int featureid, bool enabled);
//If we're not the active app, don't try to render
bool bRenderingEnabled = false;
//Feature IDs
static const int FEATURE_AUDIO = 1;
static const int FEATURE_ACCEL = 2;
//Accelerometer data storage
float fLastAccelerometer[3];
/*******************************************************************************
Functions called by JNI
*******************************************************************************/
//Library init
extern "C" jint JNI_OnLoad(JavaVM* vm, void* reserved){
JNIEnv* env = NULL;
jint result = -1;
if (vm->GetEnv((void**) &env, JNI_VERSION_1_4) != JNI_OK) {
return result;
}
mEnv = env;
__android_log_print(ANDROID_LOG_INFO, "SDL", "JNI: OnLoad");
jclass cls = mEnv->FindClass ("org/libsdl/app/SDLActivity");
mActivityInstance = cls;
midCreateGLContext = mEnv->GetStaticMethodID(cls,"createGLContext","()V");
midFlipBuffers = mEnv->GetStaticMethodID(cls,"flipBuffers","()V");
midEnableFeature = mEnv->GetStaticMethodID(cls,"enableFeature","(II)V");
midUpdateAudio = mEnv->GetStaticMethodID(cls,"updateAudio","([B)V");
if(!midCreateGLContext || !midFlipBuffers || !midEnableFeature ||
!midUpdateAudio){
__android_log_print(ANDROID_LOG_INFO, "SDL", "SDL: Bad mids\n");
}else{
#ifdef DEBUG
__android_log_print(ANDROID_LOG_INFO, "SDL", "SDL: Good mids\n");
#endif
}
return JNI_VERSION_1_4;
}
//Start up the SDL app
extern "C" void Java_org_libsdl_app_SDLActivity_nativeInit( JNIEnv* env,
jobject obj ){
__android_log_print(ANDROID_LOG_INFO, "SDL", "SDL: Native Init");
mEnv = env;
bRenderingEnabled = true;
Android_EnableFeature(FEATURE_ACCEL, true);
SDL_main();
}
//Keydown
extern "C" void Java_org_libsdl_app_SDLActivity_onNativeKeyDown(JNIEnv* env,
jobject obj, jint keycode){
int r = Android_OnKeyDown(keycode);
#ifdef DEBUG
__android_log_print(ANDROID_LOG_INFO, "SDL",
"SDL: native key down %d, %d\n", keycode, r);
#endif
}
//Keyup
extern "C" void Java_org_libsdl_app_SDLActivity_onNativeKeyUp(JNIEnv* env,
jobject obj, jint keycode){
int r = Android_OnKeyUp(keycode);
#ifdef DEBUG
__android_log_print(ANDROID_LOG_INFO, "SDL",
"SDL: native key up %d, %d\n", keycode, r);
#endif
}
//Touch
extern "C" void Java_org_libsdl_app_SDLActivity_onNativeTouch(JNIEnv* env,
jobject obj, jint action, jfloat x, jfloat y, jfloat p){
#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
}
//Quit
extern "C" void Java_org_libsdl_app_SDLActivity_nativeQuit( JNIEnv* env,
jobject obj ){
//Stop rendering as we're no longer in the foreground
bRenderingEnabled = false;
//Inject a SDL_QUIT event
int r = SDL_SendQuit();
__android_log_print(ANDROID_LOG_INFO, "SDL", "SDL: Native quit %d", r);
}
//Screen size
extern "C" void Java_org_libsdl_app_SDLActivity_nativeSetScreenSize(
JNIEnv* env, jobject obj, jint width, jint height){
__android_log_print(ANDROID_LOG_INFO, "SDL",
"SDL: Set screen size on init: %d/%d\n", width, height);
Android_SetScreenResolution(width, height);
}
//Resize
extern "C" void Java_org_libsdl_app_SDLActivity_onNativeResize(
JNIEnv* env, jobject obj, jint width,
jint height, jint format){
Android_OnResize(width, height, format);
}
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;
}
/*******************************************************************************
Functions called by SDL into Java
*******************************************************************************/
extern "C" void Android_CreateContext(){
__android_log_print(ANDROID_LOG_INFO, "SDL", "SDL: sdl_create_context()\n");
bRenderingEnabled = true;
mEnv->CallStaticVoidMethod(mActivityInstance, midCreateGLContext );
}
extern "C" void Android_Render(){
if(!bRenderingEnabled){
return;
}
//When we get here, we've accumulated a full frame
mEnv->CallStaticVoidMethod(mActivityInstance, midFlipBuffers );
}
extern "C" void Android_EnableFeature(int featureid, bool enabled){
mEnv->CallStaticVoidMethod(mActivityInstance, midEnableFeature,
featureid, (int)enabled);
}
extern "C" void Android_UpdateAudioBuffer(unsigned char *buf, int len){
//Annoyingly we can't just call into Java from any thread. Because the audio
//callback is dispatched from the SDL audio thread (that wasn't made from
//java, we have to do some magic here to let the JVM know about the thread.
//Because everything it touches on the Java side is static anyway, it's
//not a big deal, just annoying.
if(!mAudioThreadEnv){
__android_log_print(ANDROID_LOG_INFO, "SDL", "SDL: Need to set up audio thread env\n");
mVM->AttachCurrentThread(&mAudioThreadEnv, NULL);
__android_log_print(ANDROID_LOG_INFO, "SDL", "SDL: ok\n");
}
jbyteArray arr = mAudioThreadEnv->NewByteArray(len);
//blah. We probably should rework this so we avoid the copy.
mAudioThreadEnv->SetByteArrayRegion(arr, 0, len, (jbyte *)buf);
__android_log_print(ANDROID_LOG_INFO, "SDL", "SDL: copied\n");
mAudioThreadEnv->CallStaticVoidMethod( mActivityInstance,
midUpdateAudio, arr );
__android_log_print(ANDROID_LOG_INFO, "SDL", "SDL: invoked\n");
}