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Android example source code file (Group.java)

This example Android source code file (Group.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, group, io, ioexception, iterator, material, materialindices, nio, object3d, shortbuffer, string, texture, util

The Group.java Android example source code

/*
 * Copyright (C) 2006 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 android.opengl;

import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.ShortBuffer;
import java.io.DataInputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Iterator;
import javax.microedition.khronos.opengles.*;

class MaterialIndices {

    private Material material = null;
    private ShortBuffer indexBuffer = null;

    public MaterialIndices(Material material, ShortBuffer indexBuffer) {
        this.material = material;
        this.indexBuffer = indexBuffer;
    }

    public Material getMaterial() {
        return material;
    }

    public ShortBuffer getIndexBuffer() {
        return indexBuffer;
    }
}

/**
 * {@hide}
 */
public class Group {

    private Object3D parent;
    private String name;

    private List<MaterialIndices> materialIndices =
        new ArrayList<MaterialIndices>();

    public Group(Object3D parent) {
        this.parent = parent;
    }

    public String getName() {
        return name;
    }

    public void load(DataInputStream dis) throws IOException {
        dis.readInt(); // name length
        this.name = dis.readUTF();

        int numMaterials = dis.readInt();

        for (int i = 0; i < numMaterials; i++) {
            dis.readInt(); // material name length
            String matName = dis.readUTF();
            Material material = parent.getMaterial(matName);

            int numIndices = dis.readInt();
            byte[] indicesBytes = new byte[numIndices * 2];
            dis.readFully(indicesBytes);

            // Swap bytes from network to native order if necessary
            if (ByteOrder.nativeOrder() == ByteOrder.LITTLE_ENDIAN) {
                int idx = 0;
                for (int j = 0; j < numIndices; j++) {
                    byte b0 = indicesBytes[idx];
                    byte b1 = indicesBytes[idx + 1];
                    indicesBytes[idx] = b1;
                    indicesBytes[idx + 1] = b0;
                    idx += 2;
                }
            }

            ByteBuffer ibb = ByteBuffer.allocateDirect(2*numIndices);
            ibb.order(ByteOrder.nativeOrder());
            ibb.put(indicesBytes);
            ibb.position(0);

            ShortBuffer sb = ibb.asShortBuffer();
            materialIndices.add(new MaterialIndices(material, sb));
        }
    }

    public int getNumTriangles() {
        int numTriangles = 0;
        Iterator<MaterialIndices> iter = materialIndices.iterator();
        while (iter.hasNext()) {
            MaterialIndices matIdx = iter.next();
            ShortBuffer indexBuffer = matIdx.getIndexBuffer();
            numTriangles += indexBuffer.capacity()/3;
        }
        return numTriangles;
    }

    public void draw(GL10 gl) {
        gl.glDisableClientState(gl.GL_COLOR_ARRAY);

        gl.glVertexPointer(3, gl.GL_FIXED, 0, parent.getVertexBuffer());
        gl.glEnableClientState(gl.GL_VERTEX_ARRAY);

        gl.glNormalPointer(gl.GL_FIXED, 0, parent.getNormalBuffer());
        gl.glEnableClientState(gl.GL_NORMAL_ARRAY);

        if (parent.hasTexcoords()) {
            gl.glTexCoordPointer(2, gl.GL_FIXED, 0, parent.getTexcoordBuffer());
            gl.glEnableClientState(gl.GL_TEXTURE_COORD_ARRAY);
            gl.glEnable(gl.GL_TEXTURE_2D);
        } else {
            gl.glDisable(gl.GL_TEXTURE_2D);
        }

        Iterator<MaterialIndices> iter = materialIndices.iterator();
        while (iter.hasNext()) {
            MaterialIndices matIdx = iter.next();
            ShortBuffer indexBuffer = matIdx.getIndexBuffer();
            Material mat = matIdx.getMaterial();
            mat.setMaterialParameters(gl);
            if (parent.hasTexcoords() && mat.getMap_Kd().length() > 0) {
                Texture texture = parent.getTexture(mat.getMap_Kd());
                texture.setTextureParameters(gl);
            }

            gl.glDrawElements(gl.GL_TRIANGLES,
                    indexBuffer.capacity(),
                    gl.GL_UNSIGNED_SHORT,
                    indexBuffer);
        }
    }

    public String toString() {
        return "Group[" +
        "name=" + name +
        "]";
    }
}

Other Android examples (source code examples)

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