Merge "Revert "docs: OpenGL Tutorials""

8 files changed, 0 insertions, 943 deletions

diff --git a/docs/html/images/opengl/coordinates.png b/docs/html/images/opengl/coordinates.png
deleted file mode 100644
index 7180cd5..0000000
--- a/docs/html/images/opengl/coordinates.png
+++ /dev/null
diff --git a/docs/html/images/opengl/helloopengl-es10-1.png b/docs/html/images/opengl/helloopengl-es10-1.png
deleted file mode 100644
index bdfbcdb..0000000
--- a/docs/html/images/opengl/helloopengl-es10-1.png
+++ /dev/null
diff --git a/docs/html/images/opengl/helloopengl-es10-2.png b/docs/html/images/opengl/helloopengl-es10-2.png
deleted file mode 100644
index c07dabb..0000000
--- a/docs/html/images/opengl/helloopengl-es10-2.png
+++ /dev/null
diff --git a/docs/html/images/opengl/helloopengl-es20-1.png b/docs/html/images/opengl/helloopengl-es20-1.png
deleted file mode 100644
index 44abe77..0000000
--- a/docs/html/images/opengl/helloopengl-es20-1.png
+++ /dev/null
diff --git a/docs/html/images/opengl/helloopengl-es20-2.png b/docs/html/images/opengl/helloopengl-es20-2.png
deleted file mode 100644
index 22fa52c..0000000
--- a/docs/html/images/opengl/helloopengl-es20-2.png
+++ /dev/null
diff --git a/docs/html/resources/resources-data.js b/docs/html/resources/resources-data.js
index 06a046d..0fc10bf 100644
--- a/docs/html/resources/resources-data.js
+++ b/docs/html/resources/resources-data.js
@@ -782,26 +782,6 @@ var ANDROID_RESOURCES = [
     }
   },
   {
-    tags: ['tutorial', 'gl', 'new'],
-    path: 'tutorials/opengl/opengl-es10.html',
-    title: {
-      en: 'Hello OpenGL ES 1.0'
-    },
-    description: {
-      en: 'The basics of implementing an application using the OpenGL ES 1.0 APIs.'
-    }
-  },
-  {
-    tags: ['tutorial', 'gl', 'new'],
-    path: 'tutorials/opengl/opengl-es20.html',
-    title: {
-      en: 'Hello OpenGL ES 2.0'
-    },
-    description: {
-      en: 'The basics of implementing an application using the OpenGL ES 2.0 APIs.'
-    }
-  },
-  {
     tags: ['tutorial', 'testing'],
     path: 'tutorials/testing/helloandroid_test.html',
     title: {
diff --git a/docs/html/resources/tutorials/opengl/opengl-es10.jd b/docs/html/resources/tutorials/opengl/opengl-es10.jd
deleted file mode 100644
index d18a547..0000000
--- a/docs/html/resources/tutorials/opengl/opengl-es10.jd
+++ /dev/null
@@ -1,409 +0,0 @@
-page.title=Hello OpenGL ES 1.0
-parent.title=Tutorials
-parent.link=../../browser.html?tag=tutorial
-@jd:body
-
-
-<div id="qv-wrapper">
-  <div id="qv">
-    <h2>In this document</h2>
-    
-    <ol>
-      <li><a href="#creating">Creating an OpenGL ES 1.0 Application</a></li>
-      <li>
-        <a href="#drawing">Drawing Graphic Elements</a>
-        <ol>
-          <li><a href="#define-triangle">Defining a Triangle</a></li>
-          <li><a href="#draw-triangle">Draw the Triangle</a></li>
-        </ol>
-      </li>
-      <li><a href="#projection-and-views">Using Projection and Views</a></li>
-      <li><a href="#motion">Adding Motion</a></li>
-      <li><a href="#resources">Additional Resources</a></li>
-      
-    </ol>
-    <h2 id="code-samples-list">Related Samples</h2>
-    <ol>
-      <li><a href="{@docRoot}resources/samples/ApiDemos/src/com/example/android/apis/graphics/
-index.html">API Demos - graphics</a></li>
-      <li><a
-        href="{@docRoot}resources/samples/ApiDemos/src/com/example/android/apis/graphics/
-GLSurfaceViewActivity.html">GLSurfaceViewActivity</a></li>
-    </ol>
-    <h2>See also</h2>
-    <ol>
-      <li><a href="{@docRoot}guide/topics/graphics/opengl.html">3D with OpenGL</a></li>
-      <li><a href="{@docRoot}resources/tutorials/opengl/opengl-es20.html">Hello OpenGL
-ES 2.0</a></li>
-    </ol>
-    </div>
-  </div>
-
-<p>This tutorial shows you how to create a simple Android application that uses OpenGL ES 1.0 and
-perform some basic operations using the OpenGL ES 1.0 API, including:</p>
-
-<ul>
-  <li>Creating an application using {@link android.opengl.GLSurfaceView} and {@link
-android.opengl.GLSurfaceView.Renderer}</li>
-  <li>Defining a graphic object and drawing it</li>
-  <li>Defining and applying an projection and view</li>
-  <li>Applying rotation to the drawn object</li>
-</ul>
-
-<p>This tutorial demonstrates use of the OpenGL ES 1.0 API. Both the OpenGL ES 1.0 and the ES 1.1
-API are supported by the Android framework since release 1.0 (API Level 1). The OpenGL ES 1.1 API
-is an extention of the 1.0 API, and it's capabilities are beyond the scope of this tutorial.</p>
-
-<p>Beginning with Android 2.2 (API Level 8), the framework supports OpenGL ES 2.0. For more
-information about compatibility for OpenGL versions and Android devices, see the <a
-href="{@docRoot}guide/topics/graphics/opengl.html#compatibility">3D with OpenGL</a> document.</p>
-
-
-<h2 id="creating">Creating an OpenGL ES 1.0 Application</h2>
-
-<p>OpenGL applications for Android have the same basic structure as other applications, however
-OpenGL applications use {@link android.opengl.GLSurfaceView} where other, non-OpenGL
-applications use the {@link android.view.View} or {@link android.view.SurfaceView} class.<p>
- 
-<p>To get started using OpenGL in your Android application, you must implement both a {@link
-android.opengl.GLSurfaceView} and a {@link android.opengl.GLSurfaceView.Renderer}. The {@link
-android.opengl.GLSurfaceView} is the main view type for the OpenGL applications and the {@link
-android.opengl.GLSurfaceView.Renderer} controls what is drawn within that view. For more
-information about these classes, see the <a href="{@docRoot}guide/topics/graphics/opengl.html">3D
-with OpenGL</a> document.</p>
-
-<p>To create an application that uses OpenGL ES 1.0:</p>
-  
-<ol>
-  <li>Start a new Android project with an Activity called <code>HelloOpenGLES10</code>. 
-    
-    <p class="note"><b>Note:</b> If you have not created a basic Android application yet, follow the
-      <a href="{@docRoot}resources/tutorials/hello-world.html">Hello World Tutorial</a> instructions
-      to familiarize yourself with the process.</p>
-  </li>
-  
-  <li>Modify the <code>HelloOpenGLES10</code> class as follows:
-<pre>
-package com.example.android.apis.graphics;
-
-import android.app.Activity;
-import android.content.Context;
-import android.opengl.GLSurfaceView;
-import android.os.Bundle;
-
-public class HelloOpenGLES10 extends Activity {
-  
-    private GLSurfaceView mGLView;    
-  
-    &#64;Override
-    public void onCreate(Bundle savedInstanceState) {
-        super.onCreate(savedInstanceState);
-        
-        mGLView = new HelloOpenGLSurfaceView(this);
-        setContentView(mGLView);
-    }
-    
-    &#64;Override
-    protected void onPause() {
-        super.onPause();
-        mGLView.onPause();
-    }
-    
-    &#64;Override
-    protected void onResume() {
-        super.onResume();
-        mGLView.onResume();
-    }
-    
-}
-  
-class HelloOpenGLES10SurfaceView extends GLSurfaceView {
-
-    public HelloOpenGLES10SurfaceView(Context context){
-        super(context);
-        setRenderer(new HelloOpenGLES10Renderer());
-    }
-
-}
-</pre>
-    <p>This Activity class creates a basic container for a {@link android.opengl.GLSurfaceView}.</p>
-  </li>
-
-  <li>Create the following class <code>HelloOpenGLES10Renderer</code>, which implements the 
-    {@link android.opengl.GLSurfaceView.Renderer} interface:
-
-<pre>
-package com.example.android.apis.graphics;
-
-import javax.microedition.khronos.egl.EGLConfig;
-import javax.microedition.khronos.opengles.GL10;
-
-import android.opengl.GLSurfaceView;
-
-public class HelloOpenGLES10Renderer implements GLSurfaceView.Renderer {
-
-    public void onSurfaceCreated(GL10 gl, EGLConfig config) {
-        // Set the background frame color
-        gl.glClearColor(0.5f, 0.5f, 0.5f, 1.0f);
-    }
-    
-    public void onDrawFrame(GL10 gl) {
-        // Redraw background color
-        gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);
-    }
-    
-    public void onSurfaceChanged(GL10 gl, int width, int height) {
-        gl.glViewport(0, 0, width, height);
-    }
-  
-}
-</pre>
-  </li>
-</ol>
-
-<p>These classes create a simple Android application which displays a grey screen using OpenGL
-ES 1.0 calls. While this application does not do anything very interesting, by creating these two
-classes, you have layed the foundation needed to start drawing graphic elements with OpenGL ES
-1.0.</p>
-
-<p>If you are familiar with the OpenGL ES APIs, these two classes should give you enough information
-to start using the OpenGL ES 1.0 API and creating graphics. However, if you need a bit more help
-getting started with OpenGL, head on to the next sections for a few more tips.</p>
-
-<h2 id="drawing">Drawing Graphic Elements</h2>
-
-<p>Once you have implemented a {@link android.opengl.GLSurfaceView.Renderer}, the next step is to
-draw something on it. This section shows you how to define and draw a basic triangle shape with the
-Android OpenGL ES 1.0 API.</p>
-
-<p class="note"><b>Note:</b> The following instructions build on the previous section, so if you
-have not been following along, go back to the <a href="#get-started">previous section</a> and catch
-up.</p>
-
-<h3 id="define-triangle">Defining a Triangle</h3>
-
-<p>OpenGL allows you to define objects using coordinates in three-dimensional space. So, before you
-  can draw a triangle, you must define its coordinates. In OpenGL, the typical way to do this is to
-  define a vertex array for the coordinates.</p>
-  
-<p>By default, OpenGL ES assumes a coordinate system where 0,0,0 (X,Y,Z) specifies the center of
-  the {@link android.opengl.GLSurfaceView} frame, 1,1,0 is the top right corner of the frame  and 
--1,-1,0 is  bottom left corner of the frame.</p> 
-
-<p>To define a vertex array for a triangle:</p>
-
-<ol>
-  <li>In your <code>HelloOpenGLES10Renderer</code> class, add new member variable to contain the
-vertices of a triangle shape:
-<pre>
-    private FloatBuffer triangleVB;
-</pre>
-  </li>
-
-  <li>Create a method, <code>initShapes()</code> which populates this member variable:
-<pre>
-    private void initShapes(){
-    
-        float triangleCoords[] = {
-            // X, Y, Z
-            -0.5f, -0.25f, 0,
-             0.5f, -0.25f, 0,
-             0.0f,  0.559016994f, 0
-        }; 
-        
-        // initialize vertex Buffer for triangle  
-        ByteBuffer vbb = ByteBuffer.allocateDirect(
-                // (# of coordinate values * 4 bytes per float)
-                triangleCoords.length * 4); 
-        vbb.order(ByteOrder.nativeOrder());
-        triangleVB = vbb.asFloatBuffer();
-        triangleVB.put(triangleCoords);
-        triangleVB.position(0);
-    
-    }
-</pre>
-    <p>This method defines a two-dimensional triangle shape with three equal sides.</p>
-  </li>
-  <li>Modify your <code>onSurfaceCreated()</code> method to initialize your triangle: 
-    <pre>
-    public void onSurfaceCreated(GL10 gl, EGLConfig config) {
-    
-        // Set the background frame color
-        gl.glClearColor(0.5f, 0.5f, 0.5f, 1.0f);
-        
-        // initialize the triangle vertex array
-        initShapes();
-    }
-</pre>
-  <p class="warning"><strong>Warning:</strong> Shapes and other static objects should be initialized
-    once in your <code>onSurfaceCreated()</code> method for best performance. Avoid initializing the
-    new objects in <code>onDrawFrame()</code>, as this causes the system to re-create the objects
-    for every frame redraw and slows down your application.
-  </p>
-  </li>
-
-</ol>
-
-<h3 id="draw-triangle">Draw the Triangle</h3>
-
-<p>Now that you have defined a shape to draw, you can use the OpenGL APIs to draw the
-object.</p>
-
-<p>To draw the triangle with OpenGL:</p>
-  
-<ol>
-  <li>Before you can draw your triangle, you must tell OpenGL that you are using vertex arrays.
-    Modify your <code>onSurfaceCreated()</code> method to enable vertex arrays.
-<pre>
-    public void onSurfaceCreated(GL10 gl, EGLConfig config) {
-    
-        // Set the background frame color
-        gl.glClearColor(0.5f, 0.5f, 0.5f, 1.0f);
-        
-        // initialize the triangle vertex array
-        initShapes();
-        
-        // Enable use of vertex arrays
-        gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);
-    }
-</pre>
-    <p>At this point, you are ready to draw the triangle object in the OpenGL frame.</p>
-  </li>
-  
-  <li>Modify your <code>onDrawFrame()</code> method to draw the triangle.
-<pre>
-    public void onDrawFrame(GL10 gl) {
-        // Redraw background color
-        gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);
-    
-        // Draw the triangle
-        gl.glColor4f(0.63671875f, 0.76953125f, 0.22265625f, 0.0f);
-        gl.glVertexPointer(3, GL10.GL_FLOAT, 0, triangleVB);
-        gl.glDrawArrays(GL10.GL_TRIANGLES, 0, 3);
-    }
-</pre>
-    <p><b>Note:</b> Since the triangle is stationary at this point, the system is redrawing the
-      object repeatedly in exactly the same place and so is not the most efficient use of the OpenGL
-      graphics pipeline. In a <a href="#motion">later section</a>, we add motion to the object to
-      justify this use of processing power.</p>
-  </li>
-</ol>
-
-<p id="squashed-triangle">Try running this example application on your emulator or test device and
-you should see something like this:</p>
-
-<img src="{@docRoot}images/opengl/helloopengl-es10-1.png">
-
-<p>There are a few problems with this example. First of all, it's not going to impress your
-friends. Secondly, the triangle is a bit squashed and changes shape when you change the screen
-orientation of the test device. The reason the shape is skewed is due to the fact that the object is
-being rendered in a frame which is not perfectly square. We fix that problem in the
-<a href="#projection-and-views">next section</a>.</p>
-
-<h2 id="projection-and-views">Using Projection and Views</h2>
-
-<p>OpenGL Projection and Views provide a way to calculate the coordinates of graphic objects in
-realistic proportions on graphics displays of any size. One of the basic problems in displaying
-graphics is that Android device displays are typically not square and&#8212;by default&#8212;OpenGL
-happily maps a perfectly square, uniform coordinate system onto your typically non-square
-screen.</p>
-
-<img src="{@docRoot}images/opengl/coordinates.png">
-
-<p>The illustration above shows the uniform coordinate system assumed for an OpenGL frame on the
-  left, and how these coordinates actually map to a typical device screen in landscape orientation
-  on the right. To solve this problem, you can apply OpenGL projection modes and views to transform
-  object coordinates so your graphic objects have the correct proportions on any display.</p>
-
-<p>To use a projection transformation on your triangle:</p>
-<ol>
-  <li>Modify your <code>onSurfaceChanged()</code> method to enable {@link
-    javax.microedition.khronos.opengles.GL10#GL_PROJECTION GL10.GL_PROJECTION} mode, calculate the
-    screen ratio and apply the ratio as a transformation of the object coordinates.
-<pre>
-  public void onSurfaceChanged(GL10 gl, int width, int height) {
-      gl.glViewport(0, 0, width, height);
-      
-      // make adjustments for screen ratio
-      float ratio = (float) width / height;
-      gl.glMatrixMode(GL10.GL_PROJECTION);
-      gl.glLoadIdentity();
-      gl.glFrustumf(-ratio, ratio, -1, 1, 3, 7);
-  }  
-</pre>
-  </li>
-
-  <li>Next, modify your <code>onDrawFrame()</code> method to apply the {@link
-javax.microedition.khronos.opengles.GL10#GL_MODELVIEW GL_MODELVIEW} mode and set
-a view point for the display using {@link
-android.opengl.GLU#gluLookAt(javax.microedition.khronos.opengles.GL10, float, float, float, float,
-float, float, float, float, float) GLU#gluLookAt()}.
-<pre>
-    public void onDrawFrame(GL10 gl) {
-        // Redraw background color
-        gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);
-        
-        // Set GL_MODELVIEW transformation mode
-        gl.glMatrixMode(GL10.GL_MODELVIEW);
-        gl.glLoadIdentity();
-        
-        // When using GL_MODELVIEW, you must set the view point
-        GLU.gluLookAt(gl, 0, 0, -5, 0f, 0f, 0f, 0f, 1.0f, 0.0f);        
-        
-        // Draw the triangle
-        ...
-    }
-</pre>
-  </li>
-</ol>
-
-<p>Try running this updated application on your emulator or test device and you should see something
-like this:</p>
-
-<img src="{@docRoot}images/opengl/helloopengl-es10-2.png">
-
-<p>Now that you have applied this transformation, the triangle has three equal sides, instead of the
-squashed display in the <a href="#squashed-triangle">earlier version</a>.</p>
-
-<h2 id="motion">Adding Motion</h2>
-
-<p>While it may be interesting exercise to create static graphic objects with OpenGL ES, chances
-are you want at least some of your objects to move. In this section, we add motion to to our
-triangle by rotating it.</p>
-
-<p>To add rotation to your triangle:</p>
-<ul>
-  <li>Modify your <code>onDrawFrame()</code> method to rotate the triangle object:
-<pre>
-    public void onDrawFrame(GL10 gl) {
-        ...    
-        // When using GL_MODELVIEW, you must set the view point
-        GLU.gluLookAt(gl, 0, 0, -5, 0f, 0f, 0f, 0f, 1.0f, 0.0f);        
-    
-        // Create a rotation for the triangle
-        long time = SystemClock.uptimeMillis() % 4000L;
-        float angle = 0.090f * ((int) time);
-        gl.glRotatef(angle, 0.0f, 0.0f, 1.0f);        
-        
-        // Draw the triangle
-        ...
-    }
-</pre>
-  </li>
-</ul>
-
-<p>Run the application with this code and your triangle should rotate around its center.</p>
-
-<!--
-  <h2>TouchScreen Interaction</h2>
-  Optional extra (using code from API examples)
-  -->
-
-<h2 id="resources">Additional Resources</h2>
-
-<p>Be sure to check out the OpenGL ES code samples are available in the
-<a
-href="{@docRoot}resources/samples/ApiDemos/src/com/example/android/apis/graphics/index.html">API
-Demos</a> sample application and listed in <a href="#code-samples-list">Related Samples</a>
-sidebar above.
-</p>
diff --git a/docs/html/resources/tutorials/opengl/opengl-es20.jd b/docs/html/resources/tutorials/opengl/opengl-es20.jd
deleted file mode 100644
index 5cdc343..0000000
--- a/docs/html/resources/tutorials/opengl/opengl-es20.jd
+++ /dev/null
@@ -1,514 +0,0 @@
-page.title=Hello OpenGL ES 1.0
-parent.title=Tutorials
-parent.link=../../browser.html?tag=tutorial
-@jd:body
-
-
-<div id="qv-wrapper">
-  <div id="qv">
-    <h2>In this document</h2>
-    
-    <ol>
-      <li><a href="#creating">Creating an OpenGL ES 2.0 Application</a></li>
-      <li>
-        <a href="#drawing">Drawing Graphic Elements</a>
-        <ol>
-          <li><a href="#define-triangle">Defining a Triangle</a></li>
-          <li><a href="#draw-triangle">Draw the Triangle</a></li>
-        </ol>
-      </li>
-      <li><a href="#projection-and-views">Using Projection and Views</a></li>
-      <li><a href="#motion">Adding Motion</a></li>
-      <li><a href="#resources">Additional Resources</a></li>
-      
-    </ol>
-    <h2 id="code-samples-list">Related Samples</h2>
-    <ol>
-      <li><a href="{@docRoot}resources/samples/ApiDemos/src/com/example/android/apis/graphics/
-index.html">API Demos - graphics</a></li>
-      <li><a href="{@docRoot}resources/samples/ApiDemos/src/com/example/android/apis/graphics/
-GLES20Activity.html">OpenGL ES 2.0 Example</a></li>
-    </ol>
-    <h2>See also</h2>
-    <ol>
-      <li><a href="{@docRoot}guide/topics/graphics/opengl.html">3D with OpenGL</a></li>
-      <li><a href="{@docRoot}resources/tutorials/opengl/opengl-es10.html">Hello OpenGL
-ES 1.0</a></li>
-    </ol>
-    </div>
-  </div>
-
-<p>This tutorial shows you how to create a simple Android application that uses OpenGL ES 2.0 and
-perform some basic operations using the OpenGL ES 2.0 API, including:</p>
-
-<ul>
-  <li>Creating an application using {@link android.opengl.GLSurfaceView} and {@link
-android.opengl.GLSurfaceView.Renderer}</li>
-  <li>Defining a graphic object and drawing it</li>
-  <li>Defining and applying an projection and view</li>
-  <li>Applying rotation to the drawn object</li>
-</ul>
-
-<p>This tutorial demonstrates use of the OpenGL ES 2.0 API. Beginning with Android 2.2 (API Level
-8), the framework supports OpenGL ES 2.0.</p>
-
-<p>Both the OpenGL ES 1.0 and the ES 1.1 API are supported by the Android framework since release
-1.0 (API Level 1).For more information about compatibility for OpenGL versions and Android devices,
-see the <a href="{@docRoot}guide/topics/graphics/opengl.html#compatibility">3D with OpenGL</a>
-document.</p>
-
-
-<h2 id="creating">Creating an OpenGL ES 1.0 Application</h2>
-
-<p>OpenGL applications for Android have the same basic structure as other applications, however
-OpenGL applications use {@link android.opengl.GLSurfaceView} where other, non-OpenGL
-applications use the {@link android.view.View} or {@link android.view.SurfaceView} class.<p>
- 
-<p>To get started using OpenGL in your Android application, you must implement both a {@link
-android.opengl.GLSurfaceView} and a {@link android.opengl.GLSurfaceView.Renderer}. The {@link
-android.opengl.GLSurfaceView} is the main view type for the OpenGL applications and the {@link
-android.opengl.GLSurfaceView.Renderer} controls what is drawn within that view. For more
-information about these classes, see the <a href="{@docRoot}guide/topics/graphics/opengl.html">3D
-with OpenGL</a> document.</p>
-
-<p>To create an application that uses OpenGL ES 2.0:</p>
-  
-<ol>
-  <li>Start a new Android project with an Activity called <code>HelloOpenGLES20</code>. 
-    
-    <p class="note"><b>Note:</b> If you have not created a basic Android application yet, follow the
-      <a href="{@docRoot}resources/tutorials/hello-world.html">Hello World Tutorial</a> instructions
-      to familiarize yourself with the process.</p>
-  </li>
-  
-  <li>Modify the <code>HelloOpenGLES20</code> class as follows:
-<pre>
-package com.example.android.apis.graphics;
-
-import android.app.Activity;
-import android.content.Context;
-import android.opengl.GLSurfaceView;
-import android.os.Bundle;
-
-public class HelloOpenGLES20 extends Activity {
-  
-    private GLSurfaceView mGLView;    
-  
-    &#64;Override
-    public void onCreate(Bundle savedInstanceState) {
-        super.onCreate(savedInstanceState);
-        
-        mGLView = new HelloOpenGLES20SurfaceView(this);
-        setContentView(mGLView);
-    }
-    
-    &#64;Override
-    protected void onPause() {
-        super.onPause();
-        mGLView.onPause();
-    }
-    
-    &#64;Override
-    protected void onResume() {
-        super.onResume();
-        mGLView.onResume();
-    }
-}
-  
-class HelloOpenGLES20SurfaceView extends GLSurfaceView {
-
-    public HelloOpenGLES20SurfaceView(Context context){
-        super(context);
-        
-        // Create an OpenGL ES 2.0 context.
-        setEGLContextClientVersion(2);
-
-        setRenderer(new HelloOpenGLES20Renderer());
-    }
-}
-</pre>
-    <p>This Activity class creates a basic container for a {@link android.opengl.GLSurfaceView}.</p>
-  </li>
-
-  <li>Create the following class <code>HelloOpenGLES20Renderer</code>, which implements the 
-    {@link android.opengl.GLSurfaceView.Renderer} interface:
-
-<pre>
-package com.example.android.apis.graphics;
-
-import javax.microedition.khronos.egl.EGLConfig;
-import javax.microedition.khronos.opengles.GL10;
-
-import android.opengl.GLES20;
-import android.opengl.GLSurfaceView;
-
-public class HelloOpenGLES20Renderer implements GLSurfaceView.Renderer {
-  
-    public void onSurfaceCreated(GL10 unused, EGLConfig config) {
-    
-        // Set the background frame color
-        GLES20.glClearColor(0.5f, 0.5f, 0.5f, 1.0f);
-    }
-    
-    public void onDrawFrame(GL10 unused) {
-    
-        // Redraw background color
-        GLES20.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);
-    }
-    
-    public void onSurfaceChanged(GL10 unused, int width, int height) {
-        GLES20.glViewport(0, 0, width, height);
-    }
-  
-}
-</pre>
-  </li>
-</ol>
-
-<p>These classes create a simple Android application which displays a grey screen using OpenGL
-ES 2.0 calls. While this application does not do anything very interesting, by creating these two
-classes, you have layed the foundation needed to start drawing graphic elements with OpenGL ES
-2.0.</p>
-
-<p>If your application only supports OpenGL ES 2.0, then you should declare that your application
-  requires OpenGL ES 2.0 by adding the following settings to your <a                       
-href="{@docRoot}guide/topics/manifest/manifest-intro.html">AndroidManifest.xml</a></code> file as
-shown below.</p>
-
-<pre>
-...
-    &lt;/application&gt;
-    
-    &lt;!-- Tell the system that you need ES 2.0. --&gt;
-    &lt;uses-feature android:glEsVersion="0x00020000" android:required="true" /&gt;
-
-&lt;/manifest&gt;
-</pre>
-
-<p>Adding this declaration hides your application from devices that do not support OpenGL ES 2.0
-in the Android Market.</p>
-  
-<p>If you are familiar with the OpenGL ES APIs, these preceding classes and the AndroidManifest.xml
-declaration should give you enough information to start using the OpenGL ES API and creating
-graphics. However, if you need a bit more help getting started with OpenGL, head on to the next
-sections for a few more tips.</p>
-
-
-<h2 id="drawing">Drawing Graphic Elements</h2>
-
-<p>Once you have implemented a {@link android.opengl.GLSurfaceView.Renderer}, the next step is to
-draw something on it. This section shows you how to define and draw a basic triangle shape with the
-OpenGL ES 2.0 API.</p>
-
-<p class="note"><b>Note:</b> The following instructions build on the previous section, so if you
-have not been following along, go back to the <a href="#get-started">previous section</a> and catch
-up.</p>
-
-<h3 id="define-triangle">Defining a Triangle</h3>
-
-<p>OpenGL allows you to define objects using coordinates in three-dimensional space. So, before you
-  can draw a triangle, you must define its coordinates. In OpenGL, the typical way to do this is to
-  define a vertex array for the coordinates.</p>
-  
-<p>By default, OpenGL ES assumes a coordinate system where 0,0,0 (X,Y,Z) specifies the center of
-  the {@link android.opengl.GLSurfaceView} frame, 1,1,0 is the top right corner of the frame  and 
--1,-1,0 is  bottom left corner of the frame.</p> 
-
-<p>To define a vertex array for a triangle:</p>
-
-<ol>
-  <li>In your <code>HelloOpenGLES20Renderer</code> class, add new member variable to contain the
-vertices of a triangle shape:
-<pre>
-    private FloatBuffer triangleVB;
-</pre>
-  </li>
-
-  <li>Create a method, <code>initShapes()</code> which populates this member variable:
-<pre>
-    private void initShapes(){
-    
-        float triangleCoords[] = {
-            // X, Y, Z
-            -0.5f, -0.25f, 0,
-             0.5f, -0.25f, 0,
-             0.0f,  0.559016994f, 0
-        }; 
-        
-        // initialize vertex Buffer for triangle  
-        ByteBuffer vbb = ByteBuffer.allocateDirect(
-                // (# of coordinate values * 4 bytes per float)
-                triangleCoords.length * 4); 
-        vbb.order(ByteOrder.nativeOrder());
-        triangleVB = vbb.asFloatBuffer();
-        triangleVB.put(triangleCoords);
-        triangleVB.position(0);
-    
-    }
-</pre>
-    <p>This method defines a two-dimensional triangle shape with three equal sides.</p>
-  </li>
-  <li>Modify your <code>onSurfaceCreated()</code> method to initialize your triangle:
-<pre>
-    public void onSurfaceCreated(GL10 unused, EGLConfig config) {
-    
-        // Set the background frame color
-        GLES20.glClearColor(0.5f, 0.5f, 0.5f, 1.0f);
-        
-        // initialize the triangle vertex array
-        initShapes();
-    }
-</pre>
-  <p class="warning"><strong>Warning:</strong> Shapes and other static objects should be initialized
-    once in your <code>onSurfaceCreated()</code> method for best performance. Avoid initializing the
-    new objects in <code>onDrawFrame()</code>, as this causes the system to re-create the objects
-    for every frame redraw and slows down your application.
-  </p>
-  </li>
-
-</ol>
-
-<h3 id="draw-triangle">Draw the Triangle</h3>
-
-<p>Now that you have defined a shape to draw, you can now use the OpenGL APIs to draw the
-  object. In order to do this with OpenGL ES 2.0, you must define a vertex shader and a
-fragment shader to describe how to draw your shape.</p>
-
-<p>To draw the triangle with OpenGL:</p>
-  
-<ol>
-  <li>In your <code>HelloOpenGLES20Renderer</code> class, define a vertex shader and a fragment
-shader.
-<pre>
-    private final String vertexShaderCode = 
-        "attribute vec4 vPosition;    \n" +
-        "void main(){         \n" +
-        " gl_Position = vPosition;  \n" +
-        "}                \n";
-    
-    private final String fragmentShaderCode = 
-        "precision mediump float; \n" +
-        "void main(){       \n" +
-        " gl_FragColor = vec4 (0.63671875, 0.76953125, 0.22265625, 1.0); \n" +
-        "} \n";
-</pre>
-  </li>
-  <li>In your <code>HelloOpenGLES20Renderer</code> class, create a method for loading the shaders.
-<pre>
-    private int loadShader(int type, String shaderCode){
-    
-        int shader = GLES20.glCreateShader(type);
-        
-        GLES20.glShaderSource(shader, shaderCode);
-        GLES20.glCompileShader(shader);
-        
-        return shader;
-    }
-</pre>
-  </li>
-  
-  <li>Add the following members to your <code>HelloOpenGLES20Renderer</code> class for an OpenGL
-Program.
-<pre>
-    private int mProgram;
-    private int maPositionHandle;
-</pre>
-  </li>
-  
-  <li>Modify your <code>onSurfaceCreated()</code> method to load the shaders and attach them to a
-OpenGL Program.
-<pre>
-    public void onSurfaceCreated(GL10 unused, EGLConfig config) {
-    
-        // Set the background frame color
-        GLES20.glClearColor(0.5f, 0.5f, 0.5f, 1.0f);
-        
-        // initialize the triangle vertex array
-        initShapes();
-        
-        // Create shaders for shape and attach to program
-        int vertexShader = loadShader(GLES20.GL_VERTEX_SHADER, vertexShaderCode);
-        int fragmentShader = loadShader(GLES20.GL_FRAGMENT_SHADER, fragmentShaderCode);
-        
-        mProgram = GLES20.glCreateProgram();
-        GLES20.glAttachShader(mProgram, vertexShader);
-        GLES20.glAttachShader(mProgram, fragmentShader);
-        GLES20.glLinkProgram(mProgram);
-        
-        maPositionHandle = GLES20.glGetAttribLocation(mProgram, "vPosition");
-    }
-</pre>
-    <p>At this point, you are ready to draw the triangle object in the OpenGL frame.</p>
-  </li>
-  
-  <li>Modify your <code>onDrawFrame()</code> method to draw the triangle.
-<pre>
-    public void onDrawFrame(GL10 unused) {
-        
-        // Redraw background color
-        GLES20.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);
-    
-        // Specify a program with shaders
-        GLES20.glUseProgram(mProgram);
-        
-        // Prepare the triangle data
-        GLES20.glVertexAttribPointer(maPositionHandle, 3, GLES20.GL_FLOAT, false, 12, triangleVB);
-        GLES20.glEnableVertexAttribArray(maPositionHandle);
-        
-        // Draw the triangle
-        GLES20.glDrawArrays(GLES20.GL_TRIANGLES, 0, 3);
-    }
-</pre>
-    <p><b>Note:</b> Since the triangle is stationary at this point, the system is redrawing the
-      object repeatedly in exactly the same place and so is not the most efficient use of the OpenGL
-      graphics pipeline. In a <a href="#motion">later section</a>, we add motion to the object to
-      justify this use of processing power.</p>
-  </li>
-</ol>
-
-<p id="squashed-triangle">Try running this example application on your emulator or test device and
-you should see something like this:</p>
-
-<img src="{@docRoot}images/opengl/helloopengl-es20-1.png">
-
-<p>There are a few problems with this example. First of all, it's not going to impress your
-friends. Secondly, the triangle is a bit squashed and changes shape when you change the screen
-orientation of the test device. The reason the shape is skewed is due to the fact that the object is
-being rendered in a frame which is not perfectly square. We fix that problem in the
-<a href="#projection-and-views">next section</a>.</p>
-
-<h2 id="projection-and-views">Using Projection and Views</h2>
-
-<p>OpenGL Projection and Views provide a way to calculate the coordinates of graphic objects in
-realistic proportions on graphics displays of any size. One of the basic problems in displaying
-graphics is that Android device displays are typically not square and&#8212;by default&#8212;OpenGL
-happily maps a perfectly square, uniform coordinate system onto your typically non-square
-screen.</p>
-
-<img src="{@docRoot}images/opengl/coordinates.png">
-  
-<p>The illustration above shows the uniform coordinate system assumed for an OpenGL frame on the
-  left, and how these coordinates actually map to a typical device screen in landscape orientation
-  on the right. To solve this problem, you can apply OpenGL projection modes and views to transform
-  object coordinates so your graphic objects have the correct proportions on any display.</p>
-
-<p>To use a projection transformation on your triangle:</p>
-<ol>
-  <li>Add the following members to your <code>HelloOpenGLES20Renderer</code> class.
-<pre>
-    private int muMVPMatrixHandle;
-    private float[] mMVPMatrix = new float[16];
-    private float[] mMMatrix = new float[16];
-    private float[] mVMatrix = new float[16];
-    private float[] mProjMatrix = new float[16];
-</pre>
-    </li>
-    <li>Modify your <code>vertexShaderCode</code> string to add a variable for a model view
-projection matrix.
-<pre>
-    private final String vertexShaderCode = 
-        "uniform mat4 uMVPMatrix;   \n" +
-        "attribute vec4 vPosition;  \n" +
-        "void main(){               \n" +
-        " gl_Position = uMVPMatrix * vPosition; \n" +
-        "}  \n";
-</pre>
-    </li>
-    <li>Modify your <code>onSurfaceChanged()</code> method to reference the <code>uMVPMatrix</code>
-shader variable you added and define a view transformation matrix.
-<pre>
-    public void onSurfaceCreated(GL10 unused, EGLConfig config) {
-        ...
-        maPositionHandle = GLES20.glGetAttribLocation(mProgram, "vPosition");
-        
-        muMVPMatrixHandle = GLES20.glGetUniformLocation(mProgram, "uMVPMatrix");
-        Matrix.setLookAtM(mVMatrix, 0, 0, 0, -3, 0f, 0f, 0f, 0f, 1.0f, 0.0f);
-    }
-</pre>
-    </li>
-    <li>Next, modify your <code>onSurfaceChanged()</code> method to calculate the device screen
-ration and create a projection matrix.
-<pre>
-    public void onSurfaceChanged(GL10 unused, int width, int height) {
-        GLES20.glViewport(0, 0, width, height);
-        
-        float ratio = (float) width / height;
-        Matrix.frustumM(mProjMatrix, 0, -ratio, ratio, -1, 1, 3, 7);
-    }  
-</pre>
-    </li>
-    <li>Finally, modify your <code>onDrawFrame()</code> method to apply the transformation.
-<pre>
-    public void onDrawFrame(GL10 unused) {
-        ...
-        // Apply a ModelView Projection transformation
-        Matrix.multiplyMM(mMVPMatrix, 0, mProjMatrix, 0, mVMatrix, 0);
-        GLES20.glUniformMatrix4fv(muMVPMatrixHandle, 1, false, mMVPMatrix, 0);
-        
-        // Draw the triangle
-        GLES20.glDrawArrays(GLES20.GL_TRIANGLES, 0, 3);        
-    }
-</pre>
-    </li>
-  </ol>
-  
-<p>Try running this updated application on your emulator or test device and you should see
-something like this:</p>
-  
-  <img src="{@docRoot}images/opengl/helloopengl-es20-2.png">
-    
-<p>Now that you have applied this transformation, the triangle has three equal sides, instead of the
-squashed display in the <a href="#squashed-triangle">earlier version</a>.</p>
-
-
-<h2 id="motion">Adding Motion</h2>
-
-<p>While it may be interesting exercise to create static graphic objects with OpenGL ES, chances
-are you want at least some of your objects to move. In this section, we add motion to to our
-triangle by rotating it.</p>
-
-<p>To add rotation to your triangle:</p>
-<ol>
-  <li>Add an additional tranformation matrix member to your <code>HelloOpenGLES20Renderer</code>
-class.
-    <pre>
-      private float[] mMMatrix = new float[16];
-    </pre>
-    </li>  <li>Modify your <code>onDrawFrame()</code> method to rotate the triangle object:
-<pre>
-    public void onDrawFrame(GL10 gl) {
-        ...
-    
-        // Create a rotation for the triangle
-        long time = SystemClock.uptimeMillis() % 4000L;
-        float angle = 0.090f * ((int) time);
-        Matrix.setRotateM(mMMatrix, 0, angle, 0, 0, 1.0f);
-        Matrix.multiplyMM(mMVPMatrix, 0, mVMatrix, 0, mMMatrix, 0);
-        Matrix.multiplyMM(mMVPMatrix, 0, mProjMatrix, 0, mMVPMatrix, 0);
-        
-        // Apply a ModelView Projection transformation
-        //Matrix.multiplyMM(mMVPMatrix, 0, mProjMatrix, 0, mVMatrix, 0);
-        GLES20.glUniformMatrix4fv(muMVPMatrixHandle, 1, false, mMVPMatrix, 0);
-        
-        // Draw the triangle
-        ...
-    }
-</pre>
-  </li>
-</ol>
-
-<p>Run the application with this code and your triangle should rotate around its center.</p>
-
-<!--
-  <h2>TouchScreen Interaction</h2>
-  Optional extra (using code from API examples)
-  -->
-
-<h2 id="resources">Additional Resources</h2>
-
-<p>Be sure to check out the OpenGL ES code samples are available in the
-<a
-href="{@docRoot}resources/samples/ApiDemos/src/com/example/android/apis/graphics/index.html">API
-Demos</a> sample application and listed in <a href="#code-samples-list">Related Samples</a>
-sidebar above.
-</p>