Android Open Source - agldemo G L View Stage

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License

The source code is released under:

Copyright (c) 2013 Wenhao Li Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software...

Java Source Code

/**
 * Copyright (C) 2010 Wenhao Li. All Rights Reserved.
 * //from   ww  w  .  jav a  2s.c  o  m
 */
package com.agldemo;

import javax.microedition.khronos.egl.EGLConfig;
import javax.microedition.khronos.opengles.GL10;

import android.content.res.TypedArray;
import android.graphics.Color;
import android.opengl.GLSurfaceView;
import android.opengl.GLSurfaceView.Renderer;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.view.ViewGroup.LayoutParams;

/**
 * A OpenGL view stage maintain a surface, several OpenGL view can draw on it.
 */
public class GLViewStage {
  
  private GLSurfaceView mGLSurfaceView;
  private Window mWindow;
  private float mBgRed;
  private float mBgGreen;
  private float mBgBlue;

  final int[] mLocation = new int[2];

  /**
   * 
   */
  public GLViewStage(Window w) {
    init(w);
  }

  private void init(Window w) {
    mWindow = w;

    mGLSurfaceView = new GLSurfaceView(w.getContext());
    mGLSurfaceView.setRenderer(mRenderer);

    LayoutParams lp = new LayoutParams(LayoutParams.MATCH_PARENT,
        LayoutParams.MATCH_PARENT);

    ViewGroup decor = (ViewGroup) w.getDecorView();
    decor.addView(mGLSurfaceView, 0, lp);
    
    
    TypedArray array = w.getContext().getTheme().obtainStyledAttributes(new int[] {
        android.R.attr.colorBackground
        }); 
    int c = array.getColor(0, 0xFFFFFF); 
    array.recycle();

    mBgRed = Color.red(c)/255f;
    mBgGreen = Color.green(c)/255f;
    mBgBlue = Color.blue(c)/255f;
  }

  public void onPause() {
    mGLSurfaceView.onPause();
  }

  protected void onResume() {
    mGLSurfaceView.onResume();
  }

  private void drawGLView(GL10 gl, View v) {
    if (v instanceof GLView) {
      GLView gv = (GLView) v;

      if (gv.getVisibility() != View.VISIBLE)
        return;

      int w, h;
      w = v.getWidth();
      h = v.getHeight();

      gv.getLocationOnScreen(mLocation);
      mLocation[1] = mGLSurfaceView.getHeight() - mLocation[1] - h;

      gl.glViewport(mLocation[0], mLocation[1], w, h);
      gl.glEnable(GL10.GL_SCISSOR_TEST);
      gl.glScissor(mLocation[0], mLocation[1], w, h);
      gl.glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
      gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);
      
      gv.drawGL(gl);
      
      gl.glDisable(GL10.GL_SCISSOR_TEST);

      return;
    }

    if (v instanceof ViewGroup) {
      ViewGroup vg = (ViewGroup) v;
      for (int i = 0; i < vg.getChildCount(); i++) {
        drawGLView(gl, vg.getChildAt(i));
      }

      return;
    }
  }

  private Renderer mRenderer = new GLSurfaceView.Renderer() {

    public void onDrawFrame(GL10 gl) {
      gl.glClearColor(mBgRed, mBgGreen, mBgBlue, 1.0f);
      gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);
      drawGLView(gl, mWindow.getDecorView());
    }

    public void onSurfaceChanged(GL10 gl, int width, int height) {
    }

    public void onSurfaceCreated(GL10 gl, EGLConfig config) {
      gl.glEnable(GL10.GL_DITHER);
      gl.glEnable(GL10.GL_DEPTH_TEST);
      gl.glDepthFunc(GL10.GL_LEQUAL);
    }
  };

}

Java Source Code List

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