3D Programming Tricks - Beginning Android Games - page 541

Listing 11-6. Vertices3.java, the Final Version with Support for Normals
package com.badlogic.androidgames.framework.gl;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.IntBuffer;
import java.nio.ShortBuffer;
import javax.microedition.khronos.opengles.GL10;
import com.badlogic.androidgames.framework.impl.GLGraphics;
public class Vertices3 {
final GLGraphics glGraphics;
final boolean hasColor;
final boolean hasTexCoords;
final boolean hasNormals;
final int vertexSize;
final IntBuffer vertices;
final int [] tmpBuffer;
final ShortBuffer indices;
Among the members, the only new addition is the hasNormals Boolean, which keeps track of
whether the vertices have normals or not.
public Vertices3(GLGraphics glGraphics, int maxVertices, int maxIndices,
boolean hasColor, boolean hasTexCoords, boolean hasNormals) {
this .glGraphics = glGraphics;
this .hasColor = hasColor;
this .hasTexCoords = hasTexCoords;
this .hasNormals = hasNormals;
this .vertexSize = (3 + (hasColor ? 4 : 0) + (hasTexCoords ? 2 : 0) +
(hasNormals ? 3 : 0)) * 4;
this .tmpBuffer = new int [maxVertices * vertexSize / 4];
ByteBuffer buffer = ByteBuffer. allocateDirect (maxVertices * vertexSize);
buffer.order(ByteOrder. nativeOrder ());
vertices = buffer.asIntBuffer();
if (maxIndices > 0) {
buffer = ByteBuffer. allocateDirect (maxIndices * Short. SIZE / 8);
buffer.order(ByteOrder. nativeOrder ());
indices = buffer.asShortBuffer();
} else {
indices = null ;
}
}
In the constructor, we now also take a hasNormals parameter. We have to modify the calculation
of the vertexSize member as well, adding three floats per vertex if normals are available.