public void updateVisibleOctant(GL gl) {
// Limits
refreshLimits();
// Switch to OpenGL select mode
int capacity = 1 * 4 * leaves.getCount(); // Each object take in maximium : 4 * name stack depth
IntBuffer hitsBuffer = BufferUtil.newIntBuffer(capacity);
gl.glSelectBuffer(hitsBuffer.capacity(), hitsBuffer);
gl.glRenderMode(GL.GL_SELECT);
gl.glInitNames();
gl.glPushName(0);
gl.glDisable(GL.GL_CULL_FACE); // Disable flags
// Draw the nodes cube in the select buffer
for (Octant n : leaves) {
n
.resetUpdatePositionFlag(); // Profit from the loop to do this, because this method is
// always after updating position
gl.glLoadName(n.getNumber());
n.displayOctant(gl);
}
int nbRecords = gl.glRenderMode(GL.GL_RENDER);
if (vizController.getVizModel().isCulling()) {
gl.glEnable(GL.GL_CULL_FACE);
gl.glCullFace(GL.GL_BACK);
}
visibleLeaves.clear();
// Get the hits and add the nodes' objects to the array
int depth = Integer.MAX_VALUE;
int minDepth = -1;
for (int i = 0; i < nbRecords; i++) {
int hit = hitsBuffer.get(i * 4 + 3); // -1 Because of the glPushName(0)
int minZ = hitsBuffer.get(i * 4 + 1);
if (minZ < depth) {
depth = minZ;
minDepth = hit;
}
Octant nodeHit = leaves.getItem(hit);
visibleLeaves.add(nodeHit);
}
if (minDepth != -1) {
Octant closestOctant = leaves.getItem(minDepth);
Vec3f pos =
new Vec3f(closestOctant.getPosX(), closestOctant.getPosY(), closestOctant.getPosZ());
limits.setClosestPoint(pos);
}
// System.out.println(minDepth);
}
void removeLeaf(Octant leaf) {
leaves.remove(leaf);
}
void addLeaf(Octant leaf) {
leaves.add(leaf);
}