Application de rendu d’une primitive 3D

Bonjour
Voici un exemple d'une application de rendu d’une primitive 3D sous Android:

class TriangleRenderer implements GLSurfaceView.Renderer {
private Triangle mnTriangle;
private float angle = 0.f;
public TriangleRenderer(Context context) {
mnTriangle = new Triangle();
}
@Override
public void onSurfaceCreated(GL10 gl, EGLConfig config) {

gl.glClearColor(1.0f, 1.0f, 1.0f, 1);

gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);
}
@Override
public void onDrawFrame(GL10 gl) {

gl.glClear(GL10.GL_COLOR_BUFFER_BIT);

gl.glLoadIdentity();

gl.glRotatef(angle++, 1.0f, 0, 1.0f);

mnTriangle.draw(gl);
}
@Override
public void onSurfaceChanged(GL10 gl, int w, int h) {

gl.glViewport(0, 0, w, h);
}
}
class Triangle {
private final static int NB_SOMMETS = 3;

private FloatBuffer mnFTamponSommet;
private ShortBuffer mnSTamponIndex;

float[] sommets = { -0.5f, -0.25f, 0, 0.5f, -0.25f, 0, 0.0f, 0.5f, 0 };

short[] index = { 0, 1, 2 };
public Triangle() {

ByteBuffer vbb = ByteBuffer.allocateDirect(NB_SOMMETS * 3 * 4);
vbb.order(ByteOrder.nativeOrder());
mnFTamponSommet = vbb.asFloatBuffer();
mnFTamponSommet.put(sommets);
ByteBuffer ibb = ByteBuffer.allocateDirect(NB_SOMMETS * 2);
ibb.order(ByteOrder.nativeOrder());
mnSTamponIndex = ibb.asShortBuffer();
mnSTamponIndex.put(index);
mnFTamponSommet.position(0);
mnSTamponIndex.position(0);
}
public void draw(GL10 gl) {

gl.glVertexPointer(3, GL10.GL_FLOAT, 0, mnFTamponSommet);

gl.glColor4f(1.f, 0f, 0f, 1.f);

gl.glDrawElements(GL10.GL_TRIANGLE_STRIP, NB_SOMMETS,
GL10.GL_UNSIGNED_SHORT, mnSTamponIndex);
}
}