Mikel
本文简单介绍一下，camera取景画面与opengl es绘制的画面融合显示。其实说直接一点就是SurfaceView与GLSurfaceView的叠加。直接上代码吧！
package com.scy.cameraopengl;
import java.io.IOException;
import android.graphics.PixelFormat;
import android.hardware.Camera;
import android.hardware.Camera.Parameters;
import android.opengl.GLSurfaceView;
import android.os.Bundle;
import android.provider.Settings.System;
import android.app.Activity;
import android.view.Display;
import android.view.Menu;
import android.view.Surface;
import android.view.SurfaceHolder;
import android.view.Window;
import android.view.SurfaceHolder.Callback;
import android.view.ViewGroup.LayoutParams;
import android.view.SurfaceView;
import android.view.WindowManager;
import android.widget.FrameLayout;
public class MainActivity extends Activity
{
FrameLayout frameLayout;
Camera camera;
SurfaceView surface;
SurfaceHolder holder;
GLSurfaceView surfaceView;
MyRender render;
int width,height;
boolean isPreview = false;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
WindowManager wManager = (WindowManager)getSystemService(WINDOW_SERVICE);
Display display = wManager.getDefaultDisplay();
width = display.getWidth();
height = display.getHeight();
setContentView(R.layout.activity_main);
frameLayout = (FrameLayout)findViewById(R.id.framlayout);
/**
* 先添加GLSurfaceView
*/
surfaceView = new GLSurfaceView(this);
surfaceView.setEGLConfigChooser(8, 8, 8, 8, 16, 0);
/**
* Set the desired PixelFormat of the surface. The default is OPAQUE. When working with a SurfaceView,
* this must be called from the same thread running the SurfaceView's window.
*/
surfaceView.getHolder().setFormat(PixelFormat.TRANSLUCENT);
render = new MyRender();
surfaceView.setRenderer(render);
frameLayout.addView(surfaceView, new LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.FILL_PARENT));
/**
* 再添加SurfaceView图层
*/
surface = new SurfaceView(this);
holder = surface.getHolder();
holder.addCallback(new Callback()
{
@Override
public void surfaceDestroyed(SurfaceHolder holder)
{
if (camera!=null)
{
if (isPreview)
{
camera.stopPreview();
}
camera.release();
camera = null;
}
}
@Override
public void surfaceCreated(SurfaceHolder holder)
{
if (!isPreview)
{
camera = Camera.open();
}
if (!isPreview&&camera!=null)
{
try {
Parameters parameters = camera.getParameters();
parameters.setPictureSize(width, height);
parameters.setPreviewSize(width, height);
parameters.setPreviewFrameRate(6);
camera.setParameters(parameters);
camera.setPreviewDisplay(holder);
camera.startPreview();
camera.autoFocus(null);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
isPreview = true;
}
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width,
int height)
{
}
});
holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
frameLayout.addView(surface, new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
}
@Override
protected void onResume() {
super.onResume();
}
@Override
protected void onStop()
{
super.onStop();
}
}
package com.scy.cameraopengl;
import java.nio.FloatBuffer;
import java.nio.IntBuffer;
import javax.microedition.khronos.egl.EGLConfig;
import javax.microedition.khronos.opengles.GL10;
import android.R.integer;
import android.opengl.GLSurfaceView.Renderer;
public class MyRender implements Renderer
{
float[] verteices = new float[]
{
0.1f,0.6f,0.0f,
-0.3f,0.0f,0.0f,
0.3f,0.1f,0.0f
};
int[] colors = new int[]
{
65535,0,0,0,
0,65535,0,0,
0,0,65535,0
};
FloatBuffer vBuffer = MemUtil.makeFloatBuffer(verteices);
IntBuffer cBuffer = MemUtil.makeIntBuffer(colors);
@Override
public void onDrawFrame(GL10 gl)
{
gl.glClear(GL10.GL_COLOR_BUFFER_BIT|GL10.GL_DEPTH_BUFFER_BIT);
gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);
gl.glEnableClientState(GL10.GL_COLOR_ARRAY);
gl.glMatrixMode(GL10.GL_MODELVIEW);
gl.glLoadIdentity();
gl.glTranslatef(0.0f, 0.0f, -1.0f);
gl.glVertexPointer(3, GL10.GL_FLOAT, 0, vBuffer);
gl.glColorPointer(4, GL10.GL_FIXED, 0, cBuffer);
gl.glDrawArrays(GL10.GL_TRIANGLES, 0, 3);
gl.glFinish();
gl.glDisableClientState(GL10.GL_VERTEX_ARRAY);
gl.glDisableClientState(GL10.GL_COLOR_ARRAY);
}
@Override
public void onSurfaceChanged(GL10 gl, int width, int height)
{
gl.glViewport(0, 0, width, height);
gl.glMatrixMode(GL10.GL_PROJECTION);
gl.glLoadIdentity();
float ratio = (float)width/height;
gl.glFrustumf(-ratio, ratio, -1, 1, 1, 9);
}
@Override
public void onSurfaceCreated(GL10 gl, EGLConfig config)
{
gl.glDisable(GL10.GL_DITHER);
gl.glHint(GL10.GL_PERSPECTIVE_CORRECTION_HINT, GL10.GL_FASTEST);
gl.glClearColor(0, 0, 0, 0);
gl.glShadeModel(GL10.GL_SMOOTH);
gl.glEnable(GL10.GL_DEPTH_TEST);
gl.glDepthFunc(GL10.GL_LEQUAL);
}
}
package com.example.ar;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.FloatBuffer;
import java.nio.IntBuffer;
public class MemUtil {
public static FloatBuffer makeFloatBufferFromArray(float[] arr) {
ByteBuffer bb = ByteBuffer.allocateDirect(arr.length * 4);
bb.order(ByteOrder.nativeOrder());
FloatBuffer fb = bb.asFloatBuffer();
fb.put(arr);
fb.position(0);
return fb;
}
/**
* creates a floatbuffer of the given size.
*
* @param size
* @return
*/
public static FloatBuffer makeFloatBuffer(int size) {
ByteBuffer bb = ByteBuffer.allocateDirect(size * 4);
bb.order(ByteOrder.nativeOrder());
FloatBuffer fb = bb.asFloatBuffer();
fb.position(0);
return fb;
}
public static FloatBuffer makeFloatBuffer(float[] arr) {
ByteBuffer bb = ByteBuffer.allocateDirect(arr.length * 4);
bb.order(ByteOrder.nativeOrder());
FloatBuffer fb = bb.asFloatBuffer();
fb.put(arr);
fb.position(0);
return fb;
}
public static IntBuffer makeIntBuffer(int[] buff) {
ByteBuffer bb = ByteBuffer.allocateDirect(buff.length * 4);
bb.order(ByteOrder.nativeOrder());
IntBuffer sb = bb.asIntBuffer();
sb.put(buff);
sb.position(0);
return sb;
}
}
运行的效果就是摄像头取景的真实环境，上面显示一个opengl绘制的三角形面。通过这种方式结合传感器，可以实现一个简单的增强现实应用。大家有兴趣的话可以自己试试。
