Android配置EGL环境C++版

曾大稳

发布于 2020-01-20 16:47:40

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发布于 2020-01-20 16:47:40

android搭建opengles 的egl环境之前使用java已经写过，但是一般实际开发opengles的相关代码都在native层，因为native的话效率会比java高很多，步骤都是一致的，只是换一种语言写而已。之前使用java写的opengles egl环境搭建点击下面链接: https://www.jianshu.com/p/ce3496ab9e02

本文demo下载地址: https://github.com/ChinaZeng/NativeEglDemo

步骤都是一样的：

1、得到Egl实例 2、得到默认的显示设备（就是窗口） 3、初始化默认显示设备 4、设置显示设备的属性 5、从系统中获取对应属性的配置 6、创建EglContext 7、创建渲染的Surface 8、绑定EglContext和Surface到显示设备中 9、刷新数据，显示渲染场景

代码目录:

首先配置android ndk开发环境，我使用的是cmake cmake_minimum_required(VERSION 3.4.1) add_library( # Sets the name of the library. native-lib SHARED native-lib.cpp egl/EglHelper.cpp ) target_link_libraries( native-lib EGL GLESv2 android log )
书写EglHelper，这个类主要负责egl的环境初始化，绘制和销毁 //环境搭建初始化 int EglHelper::initEgl(EGLNativeWindowType window) { //1.得到默认的显示设备（就是窗口） -- eglGetDisplay mEglDisplay = eglGetDisplay(EGL_DEFAULT_DISPLAY); if (mEglDisplay == EGL_NO_DISPLAY) { LOGE("eglGetDisplay error"); return -1; } //2. 初始化默认显示设备 -- eglInitialize EGLint *version = new EGLint[2]; if (!eglInitialize(mEglDisplay, &version[0], &version[1])) { LOGE("eglInitialize error"); return -1; } //3. 设置显示设备的属性 const EGLint attrib_config_list[] = { EGL_RED_SIZE, 8, EGL_GREEN_SIZE, 8, EGL_BLUE_SIZE, 8, EGL_ALPHA_SIZE, 8, EGL_DEPTH_SIZE, 8, EGL_STENCIL_SIZE, 8,// 眼睛屏幕的距离 EGL_RENDERABLE_TYPE, EGL_OPENGL_ES2_BIT,//版本号 EGL_NONE }; //3.1 根据所需的参数获取符合该参数的config_size，主要是解决有些手机eglChooseConfig失败的兼容性问题 EGLint num_config; if (!eglChooseConfig(mEglDisplay, attrib_config_list, NULL, 1, &num_config)) { LOGE("eglChooseConfig error"); return -1; } //3.2 根据获取到的config_size得到eglConfig EGLConfig eglConfig; if (!eglChooseConfig(mEglDisplay, attrib_config_list, &eglConfig, num_config, &num_config)) { LOGE("eglChooseConfig error"); return -1; } //4. 创建egl上下文 eglCreateContext const EGLint attrib_ctx_list[] = { EGL_CONTEXT_CLIENT_VERSION, 2, EGL_NONE }; mEglContext = eglCreateContext(mEglDisplay, eglConfig, NULL, attrib_ctx_list); if (mEglContext == EGL_NO_CONTEXT) { LOGE("eglCreateContext error"); return -1; } //5.创建渲染的surface mEglSurface = eglCreateWindowSurface(mEglDisplay, eglConfig, window, NULL); if (mEglSurface == EGL_NO_SURFACE) { LOGE("eglCreateWindowSurface error"); return -1; } //6. 绑定eglContext和surface到display if (!eglMakeCurrent(mEglDisplay, mEglSurface, mEglSurface, mEglContext)) { LOGE("eglMakeCurrent error"); return -1; } //7. 刷新数据，显示渲染场景 -- eglSwapBuffers return 0; } //交换缓冲绘制 int EglHelper::swapBuffers() { if (mEglDisplay != EGL_NO_DISPLAY && mEglSurface != EGL_NO_SURFACE && eglSwapBuffers(mEglDisplay, mEglSurface)) { return 0; } return -1; } //销毁 void EglHelper::destroyEgl() { if (mEglDisplay != EGL_NO_DISPLAY) { //解绑display上的eglContext和surface eglMakeCurrent(mEglDisplay, EGL_NO_SURFACE, EGL_NO_SURFACE, EGL_NO_CONTEXT); //销毁surface 和 eglContext if (mEglSurface != EGL_NO_SURFACE) { eglDestroySurface(mEglDisplay, mEglSurface); mEglSurface = EGL_NO_SURFACE; } if (mEglContext != EGL_NO_CONTEXT) { eglDestroyContext(mEglDisplay, mEglContext); mEglContext = EGL_NO_CONTEXT; } if (mEglDisplay != EGL_NO_DISPLAY) { eglTerminate(mEglDisplay); mEglDisplay = EGL_NO_DISPLAY; } } }

书写EglThread，顾名思义，这个类主要负责开启一个线程然后根据外部的生命周期调用EglHelper完成egl的环境搭建，并且和外部交互。


EglThread::EglThread() {
    pthread_mutex_init(&pthread_mutex, NULL);
    pthread_cond_init(&pthread_cond, NULL);
}

EglThread::~EglThread() {
    pthread_mutex_destroy(&pthread_mutex);
    pthread_cond_destroy(&pthread_cond);
}


void *eglThreadImpl(void *context) {
    EglThread *eglThread = static_cast<EglThread *>(context);
    if (!eglThread) {
        LOGE("eglThreadImpl eglThread is null");
        return 0;
    }

    EglHelper *eglHelper = new EglHelper();

    if (eglHelper->initEgl(eglThread->mANativeWindow) != 0) {
        LOGE("eglHelper initEgl error");
        return 0;
    }
    eglThread->isExit = false;
    while (!eglThread->isExit) {

        if (eglThread->isCreate) {
            eglThread->isCreate = false;
            eglThread->onCreate();
        }

        if (eglThread->isChange) {
            eglThread->isChange = false;
            eglThread->isStart = true;
            eglThread->onChange(eglThread->surfaceWidth, eglThread->surfaceHeight);
        }

        if (eglThread->isStart) {
            eglThread->onDraw();
            //切换缓冲区，显示
            eglHelper->swapBuffers();

            if (eglThread->mRenderType == RENDER_MODULE_AUTO) {
                usleep(1000000 / 60);
            } else {
                pthread_mutex_lock(&eglThread->pthread_mutex);
                pthread_cond_wait(&eglThread->pthread_cond, &eglThread->pthread_mutex);
                pthread_mutex_unlock(&eglThread->pthread_mutex);
            }
        }

    }

    eglHelper->destroyEgl();
    delete eglHelper;
    eglHelper = NULL;
    //return 0表示线程结束
    return 0;

}


void EglThread::onSurfaceCreate(EGLNativeWindowType window) {
    if (mEglThread == -1) {
        isCreate = true;
        mANativeWindow = window;
        pthread_create(&mEglThread, NULL, eglThreadImpl, this);
    }
}


void EglThread::onSurfaceChange(int width, int height) {
    if (mEglThread != -1) {
        surfaceWidth = width;
        surfaceHeight = height;
        isChange = true;

        notifyRender();
    }
}

void EglThread::setRenderModule(int renderType) {
    mRenderType = renderType;
    notifyRender();
}

void EglThread::notifyRender() {
    pthread_mutex_lock(&pthread_mutex);
    pthread_cond_signal(&pthread_cond);
    pthread_mutex_unlock(&pthread_mutex);
}


void EglThread::callBackOnCreate(EglThread::OnCreate onCreate) {
    this->onCreate = onCreate;
}

void EglThread::callBackOnChange(EglThread::OnChange onChange) {
    this->onChange = onChange;
}

void EglThread::callBackOnDraw(EglThread::OnDraw onDraw) {
    this->onDraw = onDraw;
}

书写java层和native层交互，对应生命周期回调即可 NationOpenGL.javapublic class NationOpenGL { static { System.loadLibrary("native-lib"); } public native void nativeSurfaceCreate(Surface surface); public native void nativeSurfaceChanged(int width, int height); public native void nativeSurfaceDestroyed(); }

NativeGLSurfaceView.java

public class NativeGLSurfaceView extends SurfaceView implements SurfaceHolder.Callback {
    private NationOpenGL mNationOpenGL;

    public NativeGLSurfaceView(Context context) {
        this(context, null);
    }

    public NativeGLSurfaceView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public NativeGLSurfaceView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        mNationOpenGL = new NationOpenGL();
        getHolder().addCallback(this);
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        mNationOpenGL.nativeSurfaceCreate(holder.getSurface());
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
        mNationOpenGL.nativeSurfaceChanged(width, height);
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
        mNationOpenGL.nativeSurfaceDestroyed();
    }
}

native-lib.cpp

EglThread *eglThread = NULL;


void callBackOnCreate() {
    LOGE("callBackOnCreate");
}

void callBackOnChange(int width, int height) {
    glViewport(0, 0, width, height);
    LOGE("callBackOnChange");
}

void callBackOnDraw() {
    glClearColor(0.0f, 1.0f, 1.0f, 1.0f);
    glClear(GL_COLOR_BUFFER_BIT);
    LOGE("callBackOnDraw");
}

extern "C"
JNIEXPORT void JNICALL
Java_com_zzw_nativeopnegldemo_opengl_NationOpenGL_nativeSurfaceCreate(JNIEnv *env, jobject instance,
                                                                      jobject surface) {

    eglThread = new EglThread();
    eglThread->callBackOnCreate(callBackOnCreate);
    eglThread->callBackOnChange(callBackOnChange);
    eglThread->callBackOnDraw(callBackOnDraw);
    eglThread->setRenderModule(RENDER_MODULE_MANUAL);


    ANativeWindow *nativeWindow = ANativeWindow_fromSurface(env, surface);
    eglThread->onSurfaceCreate(nativeWindow);
}

extern "C"
JNIEXPORT void JNICALL
Java_com_zzw_nativeopnegldemo_opengl_NationOpenGL_nativeSurfaceChanged(JNIEnv *env,
                                                                       jobject instance, jint width,
                                                                       jint height) {
    if (eglThread) {
        eglThread->onSurfaceChange(width, height);
    }
}


extern "C"
JNIEXPORT void JNICALL
Java_com_zzw_nativeopnegldemo_opengl_NationOpenGL_nativeSurfaceDestroyed(JNIEnv *env,
                                                                         jobject instance) {
    if (eglThread) {
        eglThread->isExit = true;
        delete (eglThread);
        eglThread = NULL;
    }

}

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原始发表：2019-04-22，如有侵权请联系 cloudcommunity@tencent.com 删除

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