OpenGL ES: Going 3D - Beginning Android Games - page 490

public Vertices3(GLGraphics glGraphics, int maxVertices, int maxIndices,
boolean hasColor, boolean hasTexCoords) {
this .glGraphics = glGraphics;
this .hasColor = hasColor;
this .hasTexCoords = hasTexCoords;
this .vertexSize = (3 + (hasColor ? 4 : 0) + (hasTexCoords ? 2 : 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 ;
}
}
public void setVertices( float [] vertices, int offset, int length) {
this .vertices.clear();
int len = offset + length;
for ( int i = offset, j = 0; i < len; i++, j++)
tmpBuffer[j] = Float. floatToRawIntBits (vertices[i]);
this .vertices.put(tmpBuffer, 0, length);
this .vertices.flip();
}
public void setIndices( short [] indices, int offset, int length) {
this .indices.clear();
this .indices.put(indices, offset, length);
this .indices.flip();
}
public void bind() {
GL10 gl = glGraphics.getGL();
gl.glEnableClientState(GL10. GL_VERTEX_ARRAY );
vertices.position(0);
gl.glVertexPointer(3, GL10. GL_FLOAT , vertexSize, vertices);
if (hasColor) {
gl.glEnableClientState(GL10. GL_COLOR_ARRAY );
vertices.position(3);
gl.glColorPointer(4, GL10. GL_FLOAT , vertexSize, vertices);
}