OpenGL 1.5 sample code

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21-Apr-09 (Created: 21-Apr-09) | More in 'OpenGL'

OpenGL 1.5 sample code

satya - Tuesday, April 21, 2009 6:34:38 PM

OpenGL15TestHarnessActivity


package com.ai.android.OpenGL.SDK15;

import android.app.Activity;
import android.opengl.GLSurfaceView;
import android.os.Bundle;

//filename: OpenGLTestHarnessActivity.java
public class OpenGL15TestHarnessActivity extends Activity {
   private GLSurfaceView mTestHarness;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        mTestHarness = new GLSurfaceView(this);
        mTestHarness.setEGLConfigChooser(false);
        mTestHarness.setRenderer(new SimpleTriangleRenderer(this));
        mTestHarness.setRenderMode(GLSurfaceView.RENDERMODE_WHEN_DIRTY);
        setContentView(mTestHarness);
    }
    @Override
    protected void onResume()    {
        super.onResume();
        mTestHarness.onResume();
    }
    @Override
    protected void onPause() {
        super.onPause();
        mTestHarness.onPause();
    }
}

satya - Tuesday, April 21, 2009 6:35:23 PM

AbstractRenderer


package com.ai.android.OpenGL.SDK15;

import javax.microedition.khronos.egl.EGL10;
import javax.microedition.khronos.egl.EGLConfig;
import javax.microedition.khronos.opengles.GL10;

import android.opengl.GLU;
import android.opengl.GLSurfaceView.Renderer;

//filename: AbstractRenderer.java
public abstract class AbstractRenderer implements Renderer
{
    public int[] getConfigSpec() {
        int[] configSpec = {
                EGL10.EGL_DEPTH_SIZE, 0,
                EGL10.EGL_NONE
        };
        return configSpec;
    }

    public void onSurfaceCreated(GL10 gl, EGLConfig eglConfig) {
        gl.glDisable(GL10.GL_DITHER);
        gl.glHint(GL10.GL_PERSPECTIVE_CORRECTION_HINT,
                GL10.GL_FASTEST);
        gl.glClearColor(.5f, .5f, .5f, 1);
        gl.glShadeModel(GL10.GL_SMOOTH);
        gl.glEnable(GL10.GL_DEPTH_TEST);
    }
    
    public void onSurfaceChanged(GL10 gl, int w, int h) {
        gl.glViewport(0, 0, w, h);
        float ratio = (float) w / h;
        gl.glMatrixMode(GL10.GL_PROJECTION);
        gl.glLoadIdentity();
        gl.glFrustumf(-ratio, ratio, -1, 1, 3, 7);
    }
    
    public void onDrawFrame(GL10 gl) 
    {
        gl.glDisable(GL10.GL_DITHER);
        gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);
        gl.glMatrixMode(GL10.GL_MODELVIEW);
        gl.glLoadIdentity();
        GLU.gluLookAt(gl, 0, 0, -5, 0f, 0f, 0f, 0f, 1.0f, 0.0f);
        gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);
        draw(gl);
    }
    protected abstract void draw(GL10 gl);
}

satya - Tuesday, April 21, 2009 6:35:57 PM

SimpleTriangleRenderer


package com.ai.android.OpenGL.SDK15;

import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.FloatBuffer;
import java.nio.ShortBuffer;

import javax.microedition.khronos.opengles.GL10;

import android.content.Context;

//filename: SimpleTriangleRenderer.java
public class SimpleTriangleRenderer extends AbstractRenderer
{
   //Number of points or vertices we want to use
    private final static int VERTS = 3;
    
    //A raw native buffer to hold the point coordinates
    private FloatBuffer mFVertexBuffer;
    
    //A raw native buffer to hold indices
    //allowing a reuse of points.
    private ShortBuffer mIndexBuffer;
    
    public SimpleTriangleRenderer(Context context) 
    {
        ByteBuffer vbb = ByteBuffer.allocateDirect(VERTS * 3 * 4);
        vbb.order(ByteOrder.nativeOrder());
        mFVertexBuffer = vbb.asFloatBuffer();

        ByteBuffer ibb = ByteBuffer.allocateDirect(VERTS * 2);
        ibb.order(ByteOrder.nativeOrder());
        mIndexBuffer = ibb.asShortBuffer();

        float[] coords = {
                -0.5f, -0.5f, 0, // (x1,y1,z1)
                 0.5f, -0.5f, 0,
                 0.0f,  0.5f, 0
        };
        for (int i = 0; i < VERTS; i++) {
            for(int j = 0; j < 3; j++) {
                mFVertexBuffer.put(coords[i*3+j]);
            }
        }
        short[] myIndecesArray = {0,1,2};
        for (int i=0;i<3;i++)
        {
           mIndexBuffer.put(myIndecesArray[i]);
        }
        mFVertexBuffer.position(0);
        mIndexBuffer.position(0);
    }

   //overriden method
    protected void draw(GL10 gl)
    {
       gl.glColor4f(1.0f, 0, 0, 0.5f);
       gl.glVertexPointer(3, GL10.GL_FLOAT, 0, mFVertexBuffer);
        gl.glDrawElements(GL10.GL_TRIANGLES, VERTS,
                GL10.GL_UNSIGNED_SHORT, mIndexBuffer);
    }
}

satya - Tuesday, April 21, 2009 6:36:41 PM

AnimatedSimpleTriangleRenderer


package com.ai.android.OpenGL.SDK15;

import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.FloatBuffer;
import java.nio.ShortBuffer;

import javax.microedition.khronos.opengles.GL10;

import android.content.Context;
import android.os.SystemClock;

//filename: SimpleTriangleRenderer.java
public class AnimatedSimpleTriangleRenderer extends AbstractRenderer
{
	private int scale = 1;
   //Number of points or vertices we want to use
    private final static int VERTS = 3;
    
    //A raw native buffer to hold the point coordinates
    private FloatBuffer mFVertexBuffer;
    
    //A raw native buffer to hold indices
    //allowing a reuse of points.
    private ShortBuffer mIndexBuffer;
    
    public AnimatedSimpleTriangleRenderer(Context context) 
    {
        ByteBuffer vbb = ByteBuffer.allocateDirect(VERTS * 3 * 4);
        vbb.order(ByteOrder.nativeOrder());
        mFVertexBuffer = vbb.asFloatBuffer();

        ByteBuffer ibb = ByteBuffer.allocateDirect(VERTS * 2);
        ibb.order(ByteOrder.nativeOrder());
        mIndexBuffer = ibb.asShortBuffer();

        float[] coords = {
                -0.5f, -0.5f, 0, // (x1,y1,z1)
                 0.5f, -0.5f, 0,
                 0.0f,  0.5f, 0
        };
        for (int i = 0; i < VERTS; i++) {
            for(int j = 0; j < 3; j++) {
                mFVertexBuffer.put(coords[i*3+j]);
            }
        }
        short[] myIndecesArray = {0,1,2};
        for (int i=0;i<3;i++)
        {
           mIndexBuffer.put(myIndecesArray[i]);
        }
        mFVertexBuffer.position(0);
        mIndexBuffer.position(0);
    }

   //overriden method
    protected void draw(GL10 gl)
    {
       long time = SystemClock.uptimeMillis() % 4000L;
       float angle = 0.090f * ((int) time);

       gl.glRotatef(angle, 0, 0, 1.0f);

       gl.glColor4f(1.0f, 0, 0, 0.5f);
       gl.glVertexPointer(3, GL10.GL_FLOAT, 0, mFVertexBuffer);
        gl.glDrawElements(GL10.GL_TRIANGLES, VERTS,
                GL10.GL_UNSIGNED_SHORT, mIndexBuffer);
    }
}

satya - Tuesday, April 21, 2009 6:36:57 PM

AnimatedTriangleActivity


package com.ai.android.OpenGL.SDK15;

import android.app.Activity;
import android.opengl.GLSurfaceView;
import android.os.Bundle;

//filename: OpenGLTestHarnessActivity.java
public class AnimatedTriangleActivity extends Activity {
   private GLSurfaceView mTestHarness;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        mTestHarness = new GLSurfaceView(this);
        mTestHarness.setEGLConfigChooser(false);
        mTestHarness.setRenderer(new AnimatedSimpleTriangleRenderer(this));
        //mTestHarness.setRenderMode(GLSurfaceView.RENDERMODE_WHEN_DIRTY);
        setContentView(mTestHarness);
    }
    @Override
    protected void onResume()    {
        super.onResume();
        mTestHarness.onResume();
    }
    @Override
    protected void onPause() {
        super.onPause();
        mTestHarness.onPause();
    }
}

satya - Tuesday, April 21, 2009 6:38:20 PM

A simple driver class


package com.ai.android.OpenGL;

import com.ai.android.OpenGL.SDK15.AnimatedTriangleActivity;
import com.ai.android.OpenGL.SDK15.OpenGL15TestHarnessActivity;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;

public class HelloWorld extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        //TextView tv = new TextView(this);
        //tv.setText("Hello, Android. Say hello");
        //setContentView(tv);
        
        setContentView(R.layout.main);
    }
    
    @Override
    public boolean onCreateOptionsMenu(Menu menu) 
    {
    	//call the parent to attach any system level menus
    	super.onCreateOptionsMenu(menu);
 	   	MenuInflater inflater = getMenuInflater(); //from activity
 	   	inflater.inflate(R.menu.main_menu, menu);
    	return true;
    }
    
    @Override
    public boolean onOptionsItemSelected(MenuItem item) 
    {
    	if (item.getItemId() == R.id.OpenGL10_activity)
    	{
    		this.invoke10SimpleTriangle();
        	return true;
    	}
    	if (item.getItemId() == R.id.OpenGL15_activity)
    	{
    		this.invoke15SimpleTriangle();
        	return true;
    	}
    	if (item.getItemId() == R.id.OpenGL15_animation)
    	{
    		this.invoke15AnimatedTriangle();
        	return true;
    	}
    	return super.onOptionsItemSelected(item);
    }
    private void invoke10SimpleTriangle()
    {
		Intent intent = new Intent(this,OpenGLTestHarnessActivity.class);
		startActivity(intent);
    }
    private void invoke15SimpleTriangle()
    {
		Intent intent = new Intent(this,OpenGL15TestHarnessActivity.class);
		startActivity(intent);
    }
    private void invoke15AnimatedTriangle()
    {
		Intent intent = new Intent(this,AnimatedTriangleActivity.class);
		startActivity(intent);
    }
}

satya - Tuesday, April 21, 2009 6:38:57 PM

xml layout


<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    />
</LinearLayout>

satya - Tuesday, April 21, 2009 6:39:14 PM

A simple menu


<menu xmlns:android="http://schemas.android.com/apk/res/android">
    <!-- This group uses the default category. -->
    <group android:id="@+id/menuGroup_Main">
    
        <item android:id="@+id/OpenGL10_activity"
            android:orderInCategory="1"
            android:title="10 Simple Triangle" />
            
        <item android:id="@+id/OpenGL15_activity"
            android:orderInCategory="2"
            android:title="15 Simple Triangle" />
            
        <item android:id="@+id/OpenGL15_animation"
            android:orderInCategory="3"
            android:title="15 Animated Triangle" />
            
        <item android:id="@+id/menu_clear"
            android:orderInCategory="10"
            android:title="clear" />
    </group>
</menu>