Andriod Java OpenGL ES基本框架
Andriod Java OpenGL ES基本框架(sdk1.5)
考察下Android平台,也许可以在上面做些Game之类的
Android的OpenGL ES，一般使用类android.opengl.GLSurfaceView;
下面使用5个class构造一个基本的框架
Main为入口Activity
MyOpenGLView为窗口，可取得消息做处理。
MyOpenGLRender为渲染器，这里可获得gl句柄，实现gl初始化，窗口大小改变，帧绘制。
MyDraw为OpenGL ES的实际操作，当然，可以合并到上面渲染器中，为了明晰，独立出来。
其中包含函数init(gl),change(gl,w,h),drawframe(gl);这样修改起来是不是更便捷？
MyCube是一个彩色盒子的类，定义了顶点，色彩，面索引，draw(gl)即可绘制一个旋转的盒子。
1.入口 Main
package myopengl.openglframe;
import android.app.Activity;
import android.os.Bundle;
//入口程序，在此构造MyOpenGLView
public class Main extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
setContentView(new MyOpenGLView(this));
}
}
2.GLView,可在此取得面板等消息
package myopengl.openglframe;
import javax.microedition.khronos.egl.EGLConfig;
import javax.microedition.khronos.opengles.GL10;
import android.content.Context;
import android.opengl.GLSurfaceView;
import android.view.MotionEvent;
//OpenGL视口，可处理输入消息
public class MyOpenGLView extends GLSurfaceView {
private MyOpenGLRender _renderer;
public MyOpenGLView(Context context) {
super(context);
_renderer = new MyOpenGLRender(context);
setRenderer(_renderer);//设置当前使用的渲染器
}
//面板消息处理
public boolean onTouchEvent(final MotionEvent event) {
queueEvent(new Runnable() {
public void run() {
// _renderer.setColor(event.getX() / getWidth(), event.getY() / getHeight(), 1.0f);
}
});
return true;
}
}
3.渲染器Renderer
package myopengl.openglframe;
import javax.microedition.khronos.egl.EGLConfig;
import javax.microedition.khronos.opengles.GL10;
//import javax.microedition.khronos.opengles.GL11;
import android.content.Context;
import android.opengl.GLSurfaceView;
import android.opengl.GLU;
//OpenGL ES Surface渲染器
public class MyOpenGLRender implements GLSurfaceView.Renderer {
private Context mContext;
MyDraw mydraw;
public MyOpenGLRender(Context context)
{
mContext = context;
}
// @Override
public void onSurfaceCreated(GL10 gl, EGLConfig config) {
//这里初始化OpenGL ES
mydraw=new MyDraw(gl);
}
// @Override
public void onSurfaceChanged(GL10 gl, int w, int h) {
//屏幕改变
mydraw.change(gl,w,h);
}
// @Override
public void onDrawFrame(GL10 gl) {
//这里绘制帧
mydraw.drawframe(gl);
}
}
4.MyDraw OpenGL ES功能程序
package myopengl.openglframe;
import javax.microedition.khronos.opengles.GL10;
import android.opengl.GLU;
public class MyDraw {
MyCube mycube;
public MyDraw(GL10 gl){
init(gl);
mycube=new MyCube(); //建立一个盒子
}
public void init(GL10 gl){
//初始化OpenGL ES
gl.glHint(GL10.GL_PERSPECTIVE_CORRECTION_HINT, GL10.GL_NICEST);
gl.glClearColor(0.0f, 0.0f, 1.0f, 1);
gl.glShadeModel(GL10.GL_SMOOTH);
// gl.glEnable(GL10.GL_TEXTURE_2D);
gl.glDisable(GL10.GL_TEXTURE_2D);
gl.glDisable(GL10.GL_DEPTH_TEST);
gl.glDepthFunc(GL10.GL_LEQUAL);
gl.glDisable(GL10.GL_DITHER);
gl.glDisable(GL10.GL_LIGHTING);
// nbsp; gl.glEnable(GL10.GL_LIGHT0);
}
//OpenGL ES窗口变化处理,设定透视模式
public void change(GL10 gl,int w,int h){
gl.glViewport(0, 0, w, h);
float ratio = (float) w / h;
gl.glMatrixMode(gl.GL_PROJECTION);
gl.glLoadIdentity();
gl.glFrustumf(-ratio, ratio, -1, 1, 2, 12);
gl.glDisable(gl.GL_DITHER);
gl.glClearColor(1, 1, 1, 1);
gl.glEnable(gl.GL_SCISSOR_TEST);
gl.glScissor(0, 0, w, h);
gl.glClear(gl.GL_COLOR_BUFFER_BIT);
gl.glMatrixMode(gl.GL_MODELVIEW);
gl.glLoadIdentity();
gl.glTranslatef(0, 0, -3.0f);
gl.glScalef(0.5f, 0.5f, 0.5f);
gl.glColor4f(0.7f, 0.7f, 0.7f, 1.0f);
gl.glEnableClientState(gl.GL_VERTEX_ARRAY);
gl.glEnableClientState(gl.GL_COLOR_ARRAY);
// gl.glEnableClientState(gl.GL_NORMAL_ARRAY);
// gl.glEnableClientState(gl.GL_TEXTURE_COORD_ARRAY);
gl.glEnable(gl.GL_CULL_FACE);
}
//OpenGL ES帧绘制
public void drawframe(GL10 gl){
gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);
gl.glClearColor(0,0,0,1.0f);
mycube.draw(gl); //绘制盒子
}
}
5.彩色盒子：建立与绘制
package myopengl.openglframe;
import javax.microedition.khronos.opengles.GL10;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.IntBuffer;
import java.nio.ShortBuffer;
//一个盒子的建立，绘制
class MyCube {
private float mAngleX=0.0f;
private float mAngleY=0.0f;
private IntBuffer mVertexBuffer; //顶点
private IntBuffer mColorBuffer; //颜色
private ByteBuffer mIndexBuffer; //索引
// private IntBuffer mTextureBuffer;//贴图坐标
public MyCube() {
int one = 0x10000;
/*
后 3-2
0-1
前
7-6
4-5
*/
//顶点坐标数据
int vertices[] = { -one, -one, -one,
one, -one, -one,
one, one, -one,
-one, one, -one,
-one, -one, one,
one, -one, one,
one, one, one,
-one, one, one, };
//顶点颜色
int colors[] = { 0, 0, 0, one,
one, 0, 0, one,
one, one, 0, one,
0, one, 0, one,
0, 0, one, one,
one, 0, one, one,
one, one, one, one,
0, one, one, one, };
/* //顶点贴图坐标
int texCoords[] ={
0,0,
0,0,
0,0,
0,0,
0,0,
one,0,
one,one,
0,one
};*/
//面的索引
byte indices[] = {
0, 4, 5,
0, 5, 1,
1, 5, 6,
1, 6, 2,
2, 6, 7,
&nbs; 2, 7, 3,
3, 7, 4,
3, 4, 0,
4, 7, 6,
4, 6, 5,
3, 0, 1,
3, 1, 2 };
//建立顶点缓存mVertexBuffer
ByteBuffer vbb = ByteBuffer.allocateDirect(vertices.length * 4); // * 4 becuase of int
vbb.order(ByteOrder.nativeOrder());
mVertexBuffer = vbb.asIntBuffer();
mVertexBuffer.put(vertices);
mVertexBuffer.position(0);
//建立颜色缓存mColorBuffer
ByteBuffer cbb = ByteBuffer.allocateDirect(colors.length * 4); // * 4 becuase of int
cbb.order(ByteOrder.nativeOrder());
mColorBuffer = cbb.asIntBuffer();
mColorBuffer.put(colors);
mColorBuffer.position(0);
//建立索引缓存mIndexBuffer
mIndexBuffer = ByteBuffer.allocateDirect(indices.length);
mIndexBuffer.put(indices);
mIndexBuffer.position(0);
/* //建立贴图坐标缓存mTextureBuffer
ByteBuffer tbb = ByteBuffer.allocateDirect(texCoords.length * 4);
tbb.order(ByteOrder.nativeOrder());
mTextureBuffer = tbb.asIntBuffer();
mTextureBuffer.put(texCoords);
mTextureBuffer.position(0);
*/
}
public void draw(GL10 gl)
{
gl.glEnable(GL10.GL_DITHER);
gl.glPushMatrix();
gl.glMatrixMode(gl.GL_MODELVIEW);
gl.glLoadIdentity();
gl.glTranslatef(0, 0, -3.0f);
gl.glScalef(0.5f, 0.5f, 0.5f);
gl.glRotatef(mAngleX, 1, 0, 0);
gl.glRotatef(mAngleY, 0, 1, 0);
gl.glColor4f(0.7f, 0.7f, 0.7f, 1.0f);
gl.glEnableClientState(gl.GL_VERTEX_ARRAY);
gl.glEnableClientState(gl.GL_COLOR_ARRAY);
gl.glEnable(gl.GL_CULL_FACE);
gl.glFrontFace(gl.GL_CW);
gl.glVertexPointer(3, gl.GL_FIXED, 0, mVertexBuffer);
gl.glColorPointer(4, gl.GL_FIXED, 0, mColorBuffer);
// gl.glNormalPointer(gl.GL_FIXED,mNormalBuffer);
// gl.glTexCoordPointer(2, gl.GL_FIXED, 0, mTextureBuffer);
// gl.glBindTexture(GL10.GL_TEXTURE_2D, blueButtonTexture);
gl.glDrawElements(gl.GL_TRIANGLES, 36, gl.GL_UNSIGNED_BYTE, mIndexBuffer);
gl.glPopMatrix();
mAngleX+=2;
mAngleY+=2;
}
}
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