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POTriangle with Open-GL doesn't appear?
 

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    <p>I made an activity to display a triangle but while running it shows no triangle; I cannot figure out where the mistake is, but surely there is a random colored background each time plus I don't have any <code>force closes</code> or some <code>errors</code></p> <h2>Triangleobj.class:</h2> <pre><code>package com.exmple.open_gl; import java.nio.ByteBuffer; import java.nio.ByteOrder; import java.nio.FloatBuffer; import java.util.Random; import javax.microedition.khronos.opengles.GL10; public class Triangleobj { // ------------------------- FloatBuffer VBuff, CBuff; ByteBuffer Ibuff; private Random r = new Random(); private float[] vertices = { -1.0f, -1.0f, 1.0f, -1.0f, 0f, 1.0f }, color = { r.nextFloat(), r.nextFloat(), r.nextFloat(), r.nextFloat(), r.nextFloat(), r.nextFloat(), r.nextFloat(), r.nextFloat(), r.nextFloat(), r.nextFloat(), r.nextFloat(), r.nextFloat(), }; private byte[] indices = { 0, 1, 2 }; // ------------------------- public Triangleobj() { // ---------------------------------------------------------- ByteBuffer bb = ByteBuffer.allocateDirect(vertices.length * 4); bb.order(ByteOrder.nativeOrder()); VBuff = bb.asFloatBuffer(); VBuff.put(vertices); VBuff.position(0); // ---------------------------------------------------------- Ibuff = ByteBuffer.allocateDirect(indices.length); Ibuff.order(ByteOrder.nativeOrder()); Ibuff.put(indices); Ibuff.position(0); // ---------------------------------------------------------- bb = ByteBuffer.allocateDirect(color.length * 4); bb.order(ByteOrder.nativeOrder()); CBuff = bb.asFloatBuffer(); CBuff.put(color); CBuff.position(0); // ---------------------------------------------------------- } public void draw(GL10 gl) { gl.glFrontFace(GL10.GL_CCW); gl.glEnableClientState(GL10.GL_VERTEX_ARRAY); gl.glEnableClientState(GL10.GL_COLOR_ARRAY); gl.glVertexPointer(2, GL10.GL_FLOAT, 0, VBuff); gl.glColorPointer(4, GL10.GL_BYTE, 0, CBuff); gl.glDrawElements(GL10.GL_TRIANGLES, indices.length, GL10.GL_UNSIGNED_BYTE, Ibuff); gl.glDisableClientState(GL10.GL_COLOR_ARRAY); gl.glDisableClientState(GL10.GL_VERTEX_ARRAY); }} </code></pre> <h2>triangleRenderer.class:</h2> <pre><code>package com.exmple.open_gl; import java.util.Random; import javax.microedition.khronos.egl.EGLConfig; import javax.microedition.khronos.opengles.GL10; import android.opengl.GLSurfaceView.Renderer; import android.opengl.GLU; import android.os.SystemClock; public class triangleRenderer implements Renderer { Triangleobj t; public triangleRenderer() { t = new Triangleobj(); } @Override public void onDrawFrame(GL10 gl) { gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT); gl.glMatrixMode(GL10.GL_MODELVIEW); gl.glLoadIdentity(); t.draw(gl); } @Override public void onSurfaceChanged(GL10 gl, int width, int height) { gl.glViewport(0, 0, width, height); gl.glMatrixMode(GL10.GL_PROJECTION); gl.glLoadIdentity(); gl.glOrthof(0f, 1.0f, 0f, 1.0f, -1.0f, 1.0f); } @Override public void onSurfaceCreated(GL10 gl, EGLConfig config) { gl.glDisable(GL10.GL_DITHER); gl.glHint(GL10.GL_PERSPECTIVE_CORRECTION_HINT, GL10.GL_NICEST); Random r = new Random(); gl.glClearColor(r.nextFloat(), r.nextFloat(), r.nextFloat(), r.nextFloat()); gl.glClearDepthf(1.0f); } } </code></pre> <h2>Triangle.class:</h2> <pre><code>package com.exmple.open_gl; import android.opengl.GLSurfaceView; import android.os.Bundle; import android.app.Activity; public class Triangle extends Activity { private GLSurfaceView gls; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); gls = new GLSurfaceView(this); gls.setRenderer(new triangleRenderer()); setContentView(gls); } @Override protected void onPause() { // TODO Auto-generated method stub super.onPause(); gls.onPause(); } @Override protected void onResume() { // TODO Auto-generated method stub super.onResume(); gls.onResume(); } } </code></pre>
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