Taking the Development Ahead - Learn OpenGL ES: For Mobile Game and Graphics Development - page 237

updateModel(Counter.getUpDownValue(),
GLES20Renderer._zAngle);
if(GLES20Renderer._missiles.size() > 0) {
initMissiles();
}
renderModel(gl);
endTime = SystemClock.uptimeMillis() % 1000;
deltaTime = Math.abs(endTime - startTime);
if (deltaTime < 20) {
try {
Thread.sleep(20 - deltaTime);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
The initMissiles Method
In the initMissiles() method ( Listing 6-13 ), we create the required buffers for
the missiles. As you may have guessed it, the buffers created in this method will be
used in the renderModel() method, when glDrawElements() is called to
render the missiles, as shown in Listing 6-14 .
Listing 6-13. TANK FENCE GAME 3/src/com/apress/android/tankfencegame3/
GLES20Renderer.java
private void initMissiles() {
ListIterator<Missile> missileIterator =
_missiles.listIterator();
float[] missilesVFA = new
float[GLES20Renderer._missiles.size() * 3];
short[] missilesISA = new
short[GLES20Renderer._missiles.size()];
int vertexIterator = -1;
short indexIterator = -1;
while(missileIterator.hasNext()) {