GLSurfaceView - 最简单的jni OpenGL ES渲染

新建项目

该项目的github地址:
https://github.com/sz66cm/SimplestGLSurfaceUse.git

按照NDK第一行代码构建JNI环境

构建NDK环境地址:
http://blog.csdn.net/sz66cm/article/details/52599224

C代码

#include <jni.h>#include <android/log.h>#include <GLES/gl.h>#include <GLES/glext.h>#define LOG_TAG "render.c"#define LOGI(...) __android_log_print(ANDROID_LOG_INFO,LOG_TAG,__VA_ARGS__)void InitializeOpenGL();void resizeViewport(jint, jint);void renderFrame();JNIEXPORT jint JNI_OnLoad(JavaVM* pVM, void* reserved) {    LOGI("render.c JNI_OnLoad() start!");    return JNI_VERSION_1_6;}JNIEXPORT void Java_com_cm_glsurfaceview_Libcm_init(JNIEnv* env, jobject thiz){    LOGI("c init()");    InitializeOpenGL();}JNIEXPORT void Java_com_cm_glsurfaceview_Libcm_resize(JNIEnv* env,                                                        jobject thiz,                                                        jint width,                                                        jint height){    LOGI("c resize()");    resizeViewport(width, height);}JNIEXPORT void Java_com_cm_glsurfaceview_Libcm_render(JNIEnv* env, jobject thiz){    LOGI("c render()");    renderFrame();}void InitializeOpenGL(){    glClearColor(1.0f, 1.0f, 0.0f, 1.0f);}void resizeViewport(jint w, jint h){    glViewport(0, 0, w, h);}void renderFrame(){    glClear(GL_COLOR_BUFFER_BIT);}

Java 调用 C 的包装代码:

package com.cm.glsurfaceview;public class Libcm {    static {        System.loadLibrary("cmopengl");    }    public static native void init();    public static native void resize(int width, int height);    public static native void render();}

GLSurfaceView使用代码:

package com.cm.glsurfaceview;import javax.microedition.khronos.egl.EGLConfig;import javax.microedition.khronos.opengles.GL10;import android.app.Activity;import android.opengl.GLSurfaceView;import android.os.Bundle;import android.util.Log;import android.view.Menu;import android.view.MenuItem;public class MainActivity extends Activity {    private GLSurfaceView view;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        view = new GLSurfaceView(MainActivity.this);        view.setEGLContextClientVersion(2);//这一行代码及其重要,不然可能会出现在JNI层,glCreateShader(...)一直返回0的问题        //set the renderer        view.setRenderer(new CMRenderer());        setContentView(view);    }    @Override    protected void onPause() {        super.onPause();        view.onPause();    }    @Override    protected void onResume() {        super.onResume();        view.onResume();    }    class CMRenderer implements GLSurfaceView.Renderer {        @Override        public void onSurfaceCreated(GL10 gl, EGLConfig config) {            Libcm.init();        }        @Override        public void onSurfaceChanged(GL10 gl, int width, int height) {            Libcm.resize(width, height);        }        @Override        public void onDrawFrame(GL10 gl) {            Libcm.render();        }    }}

Android.mk配置文件

LOCAL_PATH := $(call my-dir)include $(CLEAR_VARS)LOCAL_MODULE := cmopenglLOCAL_SRC_FILES := ./cmopengles/render.cLOCAL_LDLIBS += -llog LOCAL_LDLIBS += -lGLESv2# use GL ext modelLOCAL_CFLAGS += -DGL_GLEXT_PROTOTYPESinclude $(BUILD_SHARED_LIBRARY)

Application.mk配置文件

APP_ABI := all# 以下该句不填写,在执行ndk-build的时候上报"GLES/gl.h : NO such file"错误.APP_PLATFORM := android-14

出现的问题

问题1 “GLES/gl.h : No such file”

解决:

在Application.mk文件中添加如下代码:APP_PLATFORM := android-14

问题2 “将Apk烧入手机时报java.lang.UnsatisfiedLinkError”

解决:

将lib文件下所有的.so文件以及外层文件夹如:armeabi等删除,重新ndk-build解决问题.

问题3 java.lang.UnsatisfiedLinkError 找不到相对应的方法

原因是Android.mk文件中的LOCAL_SRC_FILES写成了LOCAL_SRC_FILE 少了个S,居然ndk-build没有任何的报错,还生成了.so包.我的天,搞了我一个中午的时间.