Opengl ES 1.x NDK实例开发之七:旋转的纹理立方体

开发框架介绍请参见：Opengl ES NDK实例开发之一:搭建开发框架

本章在第六章(Opengl ES 1.x NDK实例开发之六:纹理贴图)的基础上绘制一个旋转的纹理立方体，原理和纹理贴图一样，需要注意的是定好正方体的顶点数组。

【实例讲解】

本实例添加了一个显示fps的小功能，在java层实现，原理是统计一分钟内屏幕刷新的次数

【实例源码】

[GLJNIActivity.java]

/** Copyright (C) 2007 The Android Open Source Project** Licensed under the Apache License, Version 2.0 (the "License");* you may not use this file except in compliance with the License.* You may obtain a copy of the License at**      http://www.apache.org/licenses/LICENSE-2.0** Unless required by applicable law or agreed to in writing, software* distributed under the License is distributed on an "AS IS" BASIS,* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.* See the License for the specific language governing permissions and* limitations under the License.* * author: mnorst@foxmail.com*/package com.android.gljni;import java.text.DecimalFormat;import com.android.gljni.GLJNIView;import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.view.ViewGroup.LayoutParams;
import android.widget.TextView;public class GLJNIActivity extends Activity {GLJNIView mView;TextView mTextView;@Overrideprotected void onCreate(Bundle icicle) {super.onCreate(icicle);mView = new GLJNIView(getApplication());setContentView(mView);mView.setHandler(new Handler(){@Overridepublic void handleMessage(Message msg) {super.handleMessage(msg);// 显示fpsmTextView.setText("fps:"+msg.what);}});mTextView = new TextView(this);mTextView.setText("fps:0");addContentView(mTextView, new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));}@Overrideprotected void onPause() {super.onPause();mView.onPause();}@Overrideprotected void onResume() {super.onResume();mView.onResume();}
}

[GLJNIView.java]

/** Copyright (C) 2007 The Android Open Source Project** Licensed under the Apache License, Version 2.0 (the "License");* you may not use this file except in compliance with the License.* You may obtain a copy of the License at**      http://www.apache.org/licenses/LICENSE-2.0** Unless required by applicable law or agreed to in writing, software* distributed under the License is distributed on an "AS IS" BASIS,* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.* See the License for the specific language governing permissions and* limitations under the License.* * author: mnorst@foxmail.com*/package com.android.gljni;import java.io.IOException;
import java.io.InputStream;import javax.microedition.khronos.egl.EGLConfig;
import javax.microedition.khronos.opengles.GL10;import com.android.gljni.GLJNILib;
import com.android.gljnidemo07.R;import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.opengl.GLSurfaceView;
import android.opengl.GLUtils;
import android.os.Handler;
import android.util.Log;/*** A simple GLSurfaceView sub-class that demonstrate how to perform* OpenGL ES 1.x rendering into a GL Surface.*/
public class GLJNIView extends GLSurfaceView {private static final String LOG_TAG = GLJNIView.class.getSimpleName();private Renderer renderer;public GLJNIView(Context context) {super(context);// setEGLConfigChooser会对fps产生影响setEGLConfigChooser(8, 8, 8, 8, 16, 0);renderer = new Renderer(context);setRenderer(renderer);}public void setHandler( Handler handler){renderer.setHandler(handler);}private static class Renderer implements GLSurfaceView.Renderer {//用于纹理映射的绑定，并把绑定后的ID传递给C++代码，供其调用private int[] mTexture = new int[2];//用于加载Bitmap的contextprivate Context mContext;// 统计fpsprivate Handler mHandler;private long mStartMili;            private long mEndMili;private int mFps = 0;public Renderer(Context ctx) {mContext = ctx;mStartMili =System.currentTimeMillis();}public void setHandler( Handler handler){mHandler = handler;}public void onDrawFrame(GL10 gl) {GLJNILib.step();// 以一分钟绘制的帧数来统计fpsmEndMili = System.currentTimeMillis();if( mEndMili - mStartMili > 1000 ){mHandler.sendEmptyMessageDelayed(mFps, 100);mStartMili = mEndMili;mFps = 0;}mFps++;}public void onSurfaceChanged(GL10 gl, int width, int height) {GLJNILib.resize(width, height);}public void onSurfaceCreated(GL10 gl, EGLConfig config) {//用来绑定Bitmap纹理genTexture(gl, mContext);//调用本地setTexture方法，把纹理绑定的ID传递给C++代码，以供其调用GLJNILib.setTexture(mTexture);GLJNILib.init();}/*** 加载Bitmap的方法，* 用来从res中加载Bitmap资源* */private Bitmap loadBitmap(Context context, int resourceId) {InputStream is = context.getResources().openRawResource(resourceId);Bitmap bitmap = null;try {// 利用BitmapFactory生成Bitmapbitmap = BitmapFactory.decodeStream(is);} finally {try {// 关闭流is.close();is = null;} catch (IOException e) {e.printStackTrace();}}return bitmap;}/*** 绑定Bitmap纹理* */private void genTexture(GL10 gl, Context context) {//生成纹理gl.glGenTextures(2, mTexture, 0);//加载BitmapBitmap bitmap = loadBitmap(context, R.drawable.logo);if (bitmap != null) {//如果bitmap加载成功，则生成此bitmap的纹理映射gl.glBindTexture(GL10.GL_TEXTURE_2D, mTexture[0]);//设置纹理映射的属性gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MIN_FILTER,GL10.GL_NEAREST);gl.glTexParameterf(GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MAG_FILTER,GL10.GL_NEAREST);//生成纹理映射GLUtils.texImage2D(GL10.GL_TEXTURE_2D, 0, bitmap, 0);//释放bitmap资源bitmap.recycle();}}}}

[GLJNILib.java]

/** Copyright (C) 2007 The Android Open Source Project** Licensed under the Apache License, Version 2.0 (the "License");* you may not use this file except in compliance with the License.* You may obtain a copy of the License at**      http://www.apache.org/licenses/LICENSE-2.0** Unless required by applicable law or agreed to in writing, software* distributed under the License is distributed on an "AS IS" BASIS,* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.* See the License for the specific language governing permissions and* limitations under the License.* * author: mnorst@foxmail.com*/package com.android.gljni;//Wrapper for native library
public class GLJNILib {static {System.loadLibrary("gljni");}/*** @param width the current view width* @param height the current view height*/public static native void resize(int width, int height); /*** render */public static native void step();  /*** init*/public static native void init();  /*** set the texture* @param texture  texture id*/public static native void setTexture(int[] texture);
}

[ [gl_code.cpp ]

/** Copyright (C) 2007 The Android Open Source Project** Licensed under the Apache License, Version 2.0 (the "License");* you may not use this file except in compliance with the License.* You may obtain a copy of the License at**      http://www.apache.org/licenses/LICENSE-2.0** Unless required by applicable law or agreed to in writing, software* distributed under the License is distributed on an "AS IS" BASIS,* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.* See the License for the specific language governing permissions and* limitations under the License.* * author:     mnorst@foxmail.com* created:   2014/10/27* purpose:    旋转的纹理立方体*/// OpenGL ES 1.x code#include <jni.h>
#include <android/log.h>#include <GLES/gl.h>
#include <GLES/glext.h>#include <stdio.h>
#include <stdlib.h>
#include <math.h>/************************************************************************/
/*                             定义                                     */
/************************************************************************/#define  LOG_TAG    "libgljni"
#define  LOGI(...)  __android_log_print(ANDROID_LOG_INFO,LOG_TAG,__VA_ARGS__)
#define  LOGE(...)  __android_log_print(ANDROID_LOG_ERROR,LOG_TAG,__VA_ARGS__)//初始化纹理数组
GLuint *gTexture = 0;// 定义π
const GLfloat PI = 3.1415f;// 定义顶点坐标
#define pos 1.0f// 定义顶点坐标
// 一个正方体有8个顶点,6个面
#define one 1.0f
static GLfloat gVertices[] = {one, one, -one,   -one, one, -one, one, one, one, -one, one, one, one, -one,one,-one, -one, one,one, -one, -one, -one, -one, -one, one, one,one,-one, one, one,one, -one, one,-one, -one, one,one, -one,-one,-one, -one, -one,one, one, -one,-one, one, -one,-one, one,one,-one, one, -one,-one, -one, one, -one, -one, -one,one, one,-one,one, one, one,one, -one, -one,one, -one, one
};// 定义纹理坐标
// 纹理坐标原点会因不同系统环境而有所不同。
// 比如在iOS以及Android上，纹理坐标原点（0, 0）是在左上角
// 而在OS X上，纹理坐标的原点是在左下角
static GLfloat gTexCoords[] = {   0, one,                 one, one, 0, 0, one, 0, 0, one,                 one, one, 0, 0, one, 0, 0, one,                 one, one, 0, 0, one, 0, 0, one,                 one, one, 0, 0, one, 0, 0, one,                 one, one, 0, 0, one, 0, 0, one,                 one, one, 0, 0, one, 0, }; // 旋转角度
static GLfloat gAngle = 0.0f;
/************************************************************************/
/*                             C++代码                                  */
/************************************************************************/static void printGLString(const char *name, GLenum s) {const char *v = (const char *) glGetString(s);LOGI("GL %s = %s\n", name, v);
}static void checkGlError(const char* op) {for (GLint error = glGetError(); error; error = glGetError()) {LOGI("after %s() glError (0x%x)\n", op, error);}
}bool init() {printGLString("Version", GL_VERSION);printGLString("Vendor", GL_VENDOR);printGLString("Renderer", GL_RENDERER);printGLString("Extensions", GL_EXTENSIONS);// 启用阴影平滑glShadeModel(GL_SMOOTH);// 黑色背景    glClearColor(0.0f, 0.0f, 0.0f, 0.0f);   // 设置深度缓存   glClearDepthf(1.0f);// 启用深度测试glEnable(GL_DEPTH_TEST);   // 所作深度测试的类型    glDepthFunc(GL_LEQUAL); // 对透视进行修正  glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);  return true;
}static void _gluPerspective(GLfloat fovy, GLfloat aspect, GLfloat zNear, GLfloat zFar)
{GLfloat top = zNear * ((GLfloat) tan(fovy * PI / 360.0));GLfloat bottom = -top;GLfloat left = bottom * aspect;GLfloat right = top * aspect;glFrustumf(left, right, bottom, top, zNear, zFar);
}void resize(int width, int height)
{// 防止被零除if (height==0)                               {height=1;}// 重置当前的视口glViewport(0, 0, width, height);  // 选择投影矩阵   glMatrixMode(GL_PROJECTION);    // 重置投影矩阵   glLoadIdentity();                           // 设置视口的大小_gluPerspective(45.0f,(GLfloat)width/(GLfloat)height,0.1f,100.0f);// 选择模型观察矩阵glMatrixMode(GL_MODELVIEW);  // 重置模型观察矩阵glLoadIdentity();
}void renderFrame() {// 清除屏幕和深度缓存glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);// 重置当前的模型观察矩阵glLoadIdentity();glTranslatef(0,0,-10.0f);glRotatef(gAngle, 0, 1.0F, 0);glRotatef(gAngle, 0, 0, 1.0F);// 启用顶点数组glEnableClientState(GL_VERTEX_ARRAY);//glEnableClientState(GL_COLOR_ARRAY);glEnableClientState(GL_TEXTURE_COORD_ARRAY);// 启用纹理映射glEnable(GL_TEXTURE_2D); // 选择纹理glBindTexture(GL_TEXTURE_2D, gTexture[0]); // 绘制正方体的六个面glVertexPointer(3,GL_FLOAT,0,gVertices);glTexCoordPointer(2, GL_FLOAT, 0, gTexCoords);for (int i = 0; i < 6; i++) {glDrawArrays(GL_TRIANGLE_STRIP, i * 4, 4);} // 关闭顶点数组glDisableClientState(GL_VERTEX_ARRAY);glDisableClientState(GL_TEXTURE_COORD_ARRAY);//glDisableClientState(GL_OLOR_ARRAY);gAngle += 5.f;
}/************************************************************************/
/*                          JNI代码                                     */
/************************************************************************/extern "C" {JNIEXPORT void JNICALL Java_com_android_gljni_GLJNILib_resize(JNIEnv * env, jobject obj,  jint width, jint height);JNIEXPORT void JNICALL Java_com_android_gljni_GLJNILib_step(JNIEnv * env, jobject obj);JNIEXPORT void JNICALL Java_com_android_gljni_GLJNILib_init(JNIEnv * env, jobject obj);JNIEXPORT void JNICALL Java_com_android_gljni_GLJNILib_setTexture(JNIEnv * env, jclass obj, jintArray tex);
};JNIEXPORT void JNICALL Java_com_android_gljni_GLJNILib_resize(JNIEnv * env, jobject obj,  jint width, jint height)
{resize(width, height);
}JNIEXPORT void JNICALL Java_com_android_gljni_GLJNILib_step(JNIEnv * env, jobject obj)
{renderFrame();
}JNIEXPORT void JNICALL Java_com_android_gljni_GLJNILib_init(JNIEnv * env, jobject obj)
{init();
}JNIEXPORT void JNICALL Java_com_android_gljni_GLJNILib_setTexture(JNIEnv * env, jclass obj, jintArray tex)
{gTexture = (GLuint *)env->GetIntArrayElements(tex,0);
}

源码工程： http://download.csdn.net/detail/mnorst/8123375

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