Apps GL11 Pointer method with an indirect Buffer.

[hfdjw]

I have this

package my.sphere;

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

public class SpherewallpaperActivity extends Activity {
    /** Called when the activity is first created. */
	 private GLSurfaceView glSurfaceView;
	@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        glSurfaceView = new GLSurfaceView(this);
    GLViewRenderer a =new GLViewRenderer(this);
    glSurfaceView.setRenderer(a);
    setContentView(glSurfaceView);
    }
}

and this

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

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

public class GLViewRenderer implements Renderer  {
	private float xRot;
	private float yRot;
    public Sphere mSphere;
	public void setxRot(float xRot) {
	    this.xRot += xRot;
	}

	public void setyRot(float yRot) {
	    this.yRot += yRot;
	}

	public GLViewRenderer(Context ctx) {
	    //initialize our 3D triangle here
	    mSphere = new Sphere(1, 25);
	    //Initializing the rate counter object
	    //This will help us in calculating the frames per second
	  
	}

	public void onSurfaceCreated(GL10 gl, EGLConfig config) {
	    //initialize all the things required for openGL configurations
	    gl.glClearColor(0.0f, 0.0f, 0.0f, 0.0f);    

	    gl.glHint(GL10.GL_PERSPECTIVE_CORRECTION_HINT, GL10.GL_NICEST); 
	}

	public void onDrawFrame(GL10 gl) {
	  

	    //write the drawing code needed
	    gl.glClear(GL10.GL_COLOR_BUFFER_BIT);   
	    gl.glLoadIdentity();

	    /**
	     * Change this value in z if you want to see the image zoomed in
	     */
	    gl.glTranslatef(0.0f, 0.0f, -5.0f); 

	    gl.glRotatef(xRot, 0.0f, 1.0f, 0.0f);
	    gl.glRotatef(yRot, 1.0f, 0.0f, 0.0f);
	    mSphere.draw(gl);
	}

	public void onSurfaceChanged(GL10 gl, int width, int height) {
	    if(height == 0) {                       
	        height = 1;                         
	    }

	    gl.glViewport(0, 0, width, height); 
	    gl.glMatrixMode(GL10.GL_PROJECTION);
	    gl.glLoadIdentity();                

	    //Calculate The Aspect Ratio Of The Window
	    GLU.gluPerspective(gl, 45.0f, (float)width / (float)height, 0.1f, 100.0f);

	    gl.glMatrixMode(GL10.GL_MODELVIEW);     //Select The Modelview Matrix
	    gl.glLoadIdentity();                    //Reset The Modelview Matrix
	}

	/**
	 * Used to stop the FPS counter
	 */
	public void pause() {
	    
	}

}

and this

package my.sphere;

import java.nio.FloatBuffer;

import javax.microedition.khronos.opengles.GL10;

import android.util.Log;

public class Sphere {

    static private FloatBuffer sphereVertex;
    static private FloatBuffer sphereNormal;
    static float sphere_parms[]=new float[3];

    double mRaduis;
    double mStep;
    float mVertices[];
    private static double DEG = Math.PI/180;
    int mPoints;

    /**
     * The value of step will define the size of each facet as well as the number of facets
     *  
     * @param radius
     * @param step
     */

    public Sphere( float radius, double step) {
        this.mRaduis = radius;
        this.mStep = step;
        sphereVertex = FloatBuffer.allocate(40000);
        mPoints = build();
        Log.d("ALIS CHECK!!!!!!", " COUNT:" + mPoints);
    }

    public void draw(GL10 gl) {
        gl.glFrontFace(GL10.GL_CW);
        gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);
        gl.glVertexPointer(3, GL10.GL_FLOAT, 0, sphereVertex);

        gl.glColor4f(1.0f, 0.0f, 0.0f, 1.0f);
        gl.glDrawArrays(GL10.GL_POINTS, 0, mPoints);
        gl.glDisableClientState(GL10.GL_VERTEX_ARRAY);
    }

    private int build() {

        /**
         * x = p * sin(phi) * cos(theta)
         * y = p * sin(phi) * sin(theta)
         * z = p * cos(phi)
         */
        double dTheta = mStep * DEG;
        double dPhi = dTheta;
        int points = 0;

        for(double phi = -(Math.PI); phi <= Math.PI; phi+=dPhi) {
            //for each stage calculating the slices
            for(double theta = 0.0; theta <= (Math.PI * 2); theta+=dTheta) {
                sphereVertex.put((float) (mRaduis * Math.sin(phi) * Math.cos(theta)) );
                sphereVertex.put((float) (mRaduis * Math.sin(phi) * Math.sin(theta)) );
                sphereVertex.put((float) (mRaduis * Math.cos(phi)) );
                points++;

            }
        }
        sphereVertex.position(0);
        return points;
    }
}

And when i start the app i get this errors:09-10 11:09:28.712: E/OpenGLES(277): Application my.sphere (SDK target 8) called a GL11 Pointer method with an indirect Buffer.
09-10 11:09:28.764: W/dalvikvm(277): threadid=7: thread exiting with uncaught exception (group=0x4001d800)
09-10 11:09:28.964: E/AndroidRuntime(277): FATAL EXCEPTION: GLThread 8
09-10 11:09:28.964: E/AndroidRuntime(277): java.lang.IllegalArgumentException: Must use a native order direct Buffer
09-10 11:09:28.964: E/AndroidRuntime(277): at com.google.android.gles_jni.GLImpl.glVertexPointerBounds(Native Method)
09-10 11:09:28.964: E/AndroidRuntime(277): at com.google.android.gles_jni.GLImpl.glVertexPointer(GLImpl.java:1121)
09-10 11:09:28.964: E/AndroidRuntime(277): at my.sphere.Sphere.draw(Sphere.java:39)
09-10 11:09:28.964: E/AndroidRuntime(277): at my.sphere.GLViewRenderer.onDrawFrame(GLViewRenderer.java:51)
09-10 11:09:28.964: E/AndroidRuntime(277): at android.opengl.GLSurfaceView$GLThread.guardedRun(GLSurfaceView.java:1332)
09-10 11:09:28.964: E/AndroidRuntime(277): at android.opengl.GLSurfaceView$GLThread.run(GLSurfaceView.java:1116)
Can you help me?

 

[jonbonazza]

You are initializing your buffers incorrectly. You need to do something like this:

sphereVertex.allocateDirect(mVerticies.length * 4).order(ByteOrder.nativeOrder()).asFloatBuffer();

instead of just using the allocate() method.