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Android example source code file (GLWorld.java)

This example Android source code file (GLWorld.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" TM.

Java - Android tags/keywords

arraylist, bytebuffer, glshape, glvertex, glworld, intbuffer, io, iterator, m4, nio, shortbuffer, util

The GLWorld.java Android example source code

/*
 * Copyright (C) 2008 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.example.android.apis.graphics.kube;

import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.IntBuffer;
import java.nio.ShortBuffer;
import java.util.Iterator;
import java.util.ArrayList;

import javax.microedition.khronos.opengles.GL10;

public class GLWorld {

	public void addShape(GLShape shape) {
		mShapeList.add(shape);
		mIndexCount += shape.getIndexCount();
	}
	
	public void generate() {		
	    ByteBuffer bb = ByteBuffer.allocateDirect(mVertexList.size()*4*4);
	    bb.order(ByteOrder.nativeOrder());
		mColorBuffer = bb.asIntBuffer();

	    bb = ByteBuffer.allocateDirect(mVertexList.size()*4*3);
	    bb.order(ByteOrder.nativeOrder());
	    mVertexBuffer = bb.asIntBuffer();

	    bb = ByteBuffer.allocateDirect(mIndexCount*2);
	    bb.order(ByteOrder.nativeOrder());
	    mIndexBuffer = bb.asShortBuffer();

		Iterator<GLVertex> iter2 = mVertexList.iterator();
		while (iter2.hasNext()) {
			GLVertex vertex = iter2.next();
			vertex.put(mVertexBuffer, mColorBuffer);
		}

		Iterator<GLShape> iter3 = mShapeList.iterator();
		while (iter3.hasNext()) {
			GLShape shape = iter3.next();
			shape.putIndices(mIndexBuffer);
		}
	}
	
	public GLVertex addVertex(float x, float y, float z) {
		GLVertex vertex = new GLVertex(x, y, z, mVertexList.size());
		mVertexList.add(vertex);
		return vertex;
	}
	
	public void transformVertex(GLVertex vertex, M4 transform) {
		vertex.update(mVertexBuffer, transform);
	}

	int count = 0;
    public void draw(GL10 gl)
    {
		mColorBuffer.position(0);
		mVertexBuffer.position(0);
		mIndexBuffer.position(0);

		gl.glFrontFace(GL10.GL_CW);
        gl.glShadeModel(GL10.GL_FLAT);
        gl.glVertexPointer(3, GL10.GL_FIXED, 0, mVertexBuffer);
        gl.glColorPointer(4, GL10.GL_FIXED, 0, mColorBuffer);
        gl.glDrawElements(GL10.GL_TRIANGLES, mIndexCount, GL10.GL_UNSIGNED_SHORT, mIndexBuffer);
        count++;
    }
   
    static public float toFloat(int x) {
    	return x/65536.0f;
    }

	private ArrayList<GLShape>	mShapeList = new ArrayList();	
	private ArrayList<GLVertex>	mVertexList = new ArrayList();
	
	private int mIndexCount = 0;

    private IntBuffer   mVertexBuffer;
    private IntBuffer   mColorBuffer;
    private ShortBuffer mIndexBuffer;
}

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