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OpenGL using multiple classes
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Braindrool  
View profile   Translate to Translated (View Original)
 More options Aug 15 2012, 8:37 pm
From: Braindrool <cawehk...@gmail.com>
Date: Wed, 15 Aug 2012 17:37:03 -0700 (PDT)
Local: Wed, Aug 15 2012 8:37 pm
Subject: OpenGL using multiple classes
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I've been programming for years, but I have very little experience with 3D
graphics. I thought OpenGL would be the most efficient in this project.
It's coming along alright, I am still studying the API and documentation.
But I have encountered a problem using multiple classes. For instance, here
I try to use a separate class for the player model. (Yes, currently it's
just a cube.)

Renderer:

Code:

package com.braindrool.bla;

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

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

import android.opengl.GLSurfaceView.Renderer;

public class BlaRenderer implements Renderer {

        int nrOfVertices;
        float A;
        Player player = new Player();

        public void onSurfaceCreated(GL10 gl, EGLConfig config) {
                // TODO Auto-generated method stub

                gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);
                gl.glEnableClientState(GL10.GL_COLOR_ARRAY);

                gl.glEnable(GL10.GL_CULL_FACE);

                gl.glFrontFace(GL10.GL_CCW);
                gl.glCullFace(GL10.GL_BACK);

                gl.glClearColor(0.3f, 0.8f, 0.9f, 1);

        //      initTriangle();
                player.initPlayer();

        }

        public void onDrawFrame(GL10 gl) {
                // TODO Auto-generated method stub

                gl.glLoadIdentity();

                gl.glClear(GL10.GL_COLOR_BUFFER_BIT);

                // gl.glRotatef(A * 2, 1f, 0f, 0f);
                // gl.glRotatef(A, 0f, 1f, 0f);
                //
                // gl.glColor4f(0.5f, 0, 0, 1);

                gl.glVertexPointer(3, GL10.GL_FLOAT, 0, vertexBuffer);
                gl.glColorPointer(4, GL10.GL_FLOAT, 0, colorBuffer);
                gl.glDrawElements(GL10.GL_TRIANGLES, nrOfVertices,
                                GL10.GL_UNSIGNED_SHORT, indexBuffer);
                // A++;

        }

        public void onSurfaceChanged(GL10 gl, int width, int height) {
                // TODO Auto-generated method stub
                gl.glViewport(0, 0, width, height);

        }

        private FloatBuffer vertexBuffer;
        private ShortBuffer indexBuffer;

        private FloatBuffer colorBuffer;

        private void initTriangle() {

                float[] coords = { 0, 0.5f, 0, -0.5f, -0.5f, 0.5f, 0.5f, -0.5f, 0.5f,
                                0, 0, -0.5f };

                nrOfVertices = coords.length;

                ByteBuffer vbb = ByteBuffer.allocateDirect(nrOfVertices * 3 * 4);
                vbb.order(ByteOrder.nativeOrder());
                vertexBuffer = vbb.asFloatBuffer();

                ByteBuffer ibb = ByteBuffer.allocateDirect(nrOfVertices * 2);
                ibb.order(ByteOrder.nativeOrder());
                indexBuffer = ibb.asShortBuffer();

                ByteBuffer cbb = ByteBuffer.allocateDirect(4 * nrOfVertices * 4);
                cbb.order(ByteOrder.nativeOrder());
                colorBuffer = cbb.asFloatBuffer();

                float[] colors = { 1f, 0f, 0f, 1f, // point 1
                                0f, 1f, 0f, 1f, // point 2
                                0f, 0f, 1f, 1f, // point 3
                };

                short[] indices = new short[] {
                                // indices
                                0, 1, 2, 0, 2, 3, 0, 3, 1, 3, 1, 2

                };

                vertexBuffer.put(coords);
                indexBuffer.put(indices);
                colorBuffer.put(colors);

                vertexBuffer.position(0);
                indexBuffer.position(0);
                colorBuffer.position(0);

        }

}

And now the player class.

Code:

package com.braindrool.bla;

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

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

public class Player extends BlaRenderer{

        private FloatBuffer vertexBuffer;
        private ShortBuffer indexBuffer;
        private FloatBuffer colorBuffer;
        private int nrOfVertices;
        float A;

        public void initPlayer() {

                float[] coords = {

                -0.5f, 0.5f, 0, // P0
                                -0.5f, 0, 0, // P1
                                0.5f, 0, 0, // P2
                                0.5f, 0.5f, 0, // P3
                                0.5f, 0.5f, 0.5f, // P4
                                -0.5f, 0.5f, 0.5f, // P5
                                -0.5f, 0, 0.5f, // P6
                                0.5f, 0, 0.5f // P7
                };

                nrOfVertices = coords.length;

                ByteBuffer vbb = ByteBuffer.allocateDirect(nrOfVertices * 4);
                vbb.order(ByteOrder.nativeOrder());
                vertexBuffer = vbb.asFloatBuffer();

                ByteBuffer ibb = ByteBuffer.allocate(nrOfVertices * 2);
                ibb.order(ByteOrder.nativeOrder());
                indexBuffer = ibb.asShortBuffer();

                ByteBuffer cbb = ByteBuffer.allocate(12 * 4);
                ibb.order(ByteOrder.nativeOrder());
                colorBuffer = cbb.asFloatBuffer();

                short[] indices = {

                0, 1, 2, 3, 0, 2, 0, 6, 1, 0, 5, 6, 5, 7, 6, 5, 4, 7, 4, 3, 7, 3, 2, 7

                };

                float[] colors = { 1, 0, 0, 1, 0, 1, 0, 1, 0, 0, 1, 1 };

                vertexBuffer.put(coords);
                indexBuffer.put(indices);
                colorBuffer.put(colors);

                vertexBuffer.position(0);
                indexBuffer.position(0);
                colorBuffer.position(0);

        }

}

It's a bit sloppy but meh.

The error:

Code:

Player player = new Player()

&

Code:

public class Player extends BlaRenderer{

Help appreciated!

~Braindrool


 
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Satya Komatineni  
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 More options Aug 16 2012, 8:38 am
From: Satya Komatineni <satya.komatin...@gmail.com>
Date: Thu, 16 Aug 2012 08:38:43 -0400
Local: Thurs, Aug 16 2012 8:38 am
Subject: Re: [android-developers] OpenGL using multiple classes
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Hopefully you have a good reason to structure  your classes they way
you have done.

To start BlaRenderer is a proper derived class that will get called.
So this is a concrete class by itself.

Number 2, the player class looks more like a utilitiy class and hence
doesn't need to derive from BlaRenderer. In your code I don't see the
Player class playing the role of a renderer.

Number 3, BlaRenderer has a local variable pointing to a Player class.
So the variables of Player class are physically separate from the
variables of BlaRenderer. if your intention is to have the Player as a
utility class, then

1. Don't inherit from Renderer
2. Remove the local variables in the BlaRenderer which are now
controlled by Renderer

Hope that helps
http://satyakomatineni.com/android/training
http://satyakomatineni.com
http://androidbook.com
http://twitter.com/SatyaKomatineni


 
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Braindrool  
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 More options Aug 16 2012, 5:04 pm
From: Braindrool <cawehk...@gmail.com>
Date: Thu, 16 Aug 2012 14:04:49 -0700 (PDT)
Local: Thurs, Aug 16 2012 5:04 pm
Subject: Re: [android-developers] OpenGL using multiple classes
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Don't mean to be a burden here, but think you could elaborate a bit about
how to fix? I'm new to Java, and so far I don't like it. But then again I
may just not be used to it.

...

read more »


 
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bob  
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 More options Aug 16 2012, 6:32 pm
From: bob <b...@coolfone.comze.com>
Date: Thu, 16 Aug 2012 15:32:59 -0700 (PDT)
Local: Thurs, Aug 16 2012 6:32 pm
Subject: Re: OpenGL using multiple classes
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You have an infinite loop, and you're getting a stack overflow.

In BlaRenderer, you create a new Player object:

Player player = new Player();

Since it inherits from BlaRenderer, it tries to create a new Player object:

Player player = new Player();

Since it inherits from BlaRenderer, it tries to create a new Player object:

Player player = new Player();

This continues until you are out of stack space.  One solution:

Remove this line from BlaRenderer:

Player player = new Player();


 
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Braindrool  
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 More options Aug 16 2012, 6:48 pm
From: Braindrool <cawehk...@gmail.com>
Date: Thu, 16 Aug 2012 15:48:52 -0700 (PDT)
Local: Thurs, Aug 16 2012 6:48 pm
Subject: Re: OpenGL using multiple classes
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I think you are overestimating my knowledge of Java. I don't quite
understand how to incorporate multiple classes. How do I include my
initPlayer() function?


 
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Braindrool  
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 More options Aug 19 2012, 7:51 pm
From: Braindrool <cawehk...@gmail.com>
Date: Sun, 19 Aug 2012 16:51:42 -0700 (PDT)
Local: Sun, Aug 19 2012 7:51 pm
Subject: Re: OpenGL using multiple classes
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Resolved.


 
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