GLSurfaceView - 最简单的jni OpenGL ES渲染

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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;@Overrideprotected 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 rendererview.setRenderer(new CMRenderer());setContentView(view);}@Overrideprotected void onPause() {super.onPause();view.onPause();}@Overrideprotected void onResume() {super.onResume();view.onResume();}class CMRenderer implements GLSurfaceView.Renderer {@Overridepublic void onSurfaceCreated(GL10 gl, EGLConfig config) {Libcm.init();}@Overridepublic void onSurfaceChanged(GL10 gl, int width, int height) {Libcm.resize(width, height);}@Overridepublic void onDrawFrame(GL10 gl) {Libcm.render();}}
}

Android.mk配置文件

LOCAL_PATH := $(call my-dir)include $(CLEAR_VARS)LOCAL_MODULE := cmopengl
LOCAL_SRC_FILES := ./cmopengles/render.c
LOCAL_LDLIBS += -llog 
LOCAL_LDLIBS += -lGLESv2
# use GL ext model
LOCAL_CFLAGS += -DGL_GLEXT_PROTOTYPES
include $(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.

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