android_multiviewwer/app/src/main/cpp/native_renderer.cpp

#include <jni.h>
#include <android/native_window.h>
#include <android/native_window_jni.h>
#include <android/log.h>
#include <thread>
#include "Renderer.h"
#include "Preloader.h"

#define LOG_TAG "NativeRenderer"
#define LOGI(...) __android_log_print(ANDROID_LOG_INFO, LOG_TAG, __VA_ARGS__)
#define LOGE(...) __android_log_print(ANDROID_LOG_ERROR, LOG_TAG, __VA_ARGS__)

// 전역 변수
Renderer* renderer = nullptr;
Preloader* preloader = nullptr;
JavaVM* g_vm = nullptr;
jobject g_callback_obj = nullptr;
jmethodID g_callback_method_id = nullptr;

// JNI_OnLoad 함수
JNIEXPORT jint JNICALL JNI_OnLoad(JavaVM* vm, void* reserved) {
    g_vm = vm;
    return JNI_VERSION_1_6;
}

void callNextMediaCallback() {
    JNIEnv* env;
    bool isAttached = false;
    // 현재 스레드가 JVM에 연결되어 있지 않다면 연결
    if (g_vm->GetEnv((void**)&env, JNI_VERSION_1_6) != JNI_OK) {
        g_vm->AttachCurrentThread(&env, nullptr);
        isAttached = true;
    }

    if (g_callback_obj && g_callback_method_id) {
        env->CallVoidMethod(g_callback_obj, g_callback_method_id);
    }

    // 이전에 연결되지 않았다면 연결 해제
    if (isAttached) {
        g_vm->DetachCurrentThread();
    }
}

extern "C" {

JNIEXPORT jboolean JNICALL
Java_bums_lunatic_launcher_wall_NativeRenderer_nativeInit(JNIEnv* env, jobject) {
    if (!renderer) {
        renderer = new Renderer();
    }
    if (!preloader) {
        preloader = new Preloader();
    }
    LOGI("Native renderer and preloader initialized.");
    return JNI_TRUE;
}

JNIEXPORT void JNICALL
Java_bums_lunatic_launcher_wall_NativeRenderer_nativeRender(JNIEnv* env, jobject, jobject surface) {
    if (!renderer || !surface) return;

    ANativeWindow* window = ANativeWindow_fromSurface(env, surface);
    if (!window) {
        LOGE("Could not get ANativeWindow from Surface.");
        return;
    }

    renderer->renderFrame(window);

    ANativeWindow_release(window);
}

JNIEXPORT void JNICALL
Java_bums_lunatic_launcher_wall_NativeRenderer_nativeDestroy(JNIEnv* env, jobject) {
    if (renderer) {
        delete renderer;
        renderer = nullptr;
    }
    if (preloader) {
        delete preloader;
        preloader = nullptr;
    }
    if (g_callback_obj) {
        env->DeleteGlobalRef(g_callback_obj);
        g_callback_obj = nullptr;
    }
    LOGI("Native renderer destroyed and memory freed.");
}
JNIEXPORT void JNICALL
Java_bums_lunatic_launcher_wall_NativeRenderer_nativeSetCurrentMedia(JNIEnv* env, jobject, jint fd) {
    if (!renderer) return;
    // 경로 대신 파일 디스크립터를 전달
    renderer->setNextMedia(fd);
}

JNIEXPORT void JNICALL
Java_bums_lunatic_launcher_wall_NativeRenderer_nativeStartNextPreload(JNIEnv* env, jobject, jint fd) {
    if (!preloader) return;
    // 경로 대신 파일 디스크립터를 전달
    preloader->startNextPreload(fd);
}

JNIEXPORT void JNICALL
Java_bums_lunatic_launcher_wall_NativeRenderer_nativeSetNextMediaCallback(JNIEnv* env, jobject, jobject callback) {
    jclass clazz = env->GetObjectClass(callback);
    g_callback_method_id = env->GetMethodID(clazz, "onNextMediaRequested", "()V");
    g_callback_obj = env->NewGlobalRef(callback);

    if (!g_callback_method_id) {
        LOGE("Could not find onNextMediaRequested method ID.");
    }
}
}