public void updateVisibleOctant(GL2 gl) {
if (leavesCount > 0) {
// Limits
refreshLimits();
// Switch to OpenGL2 select mode
int capacity = 1 * 4 * leavesCount; // Each object take in maximium : 4 * name stack depth
IntBuffer hitsBuffer = Buffers.newDirectIntBuffer(capacity);
gl.glSelectBuffer(hitsBuffer.capacity(), hitsBuffer);
gl.glRenderMode(GL2.GL_SELECT);
gl.glInitNames();
gl.glPushName(0);
gl.glDisable(GL2.GL_CULL_FACE); // Disable flags
// Draw the nodes cube in the select buffer
for (Octant n : leaves) {
if (n != null) {
gl.glLoadName(n.leafId);
n.displayOctant(gl);
n.visible = false;
}
}
visibleLeaves = 0;
int nbRecords = gl.glRenderMode(GL2.GL_RENDER);
if (vizController.getVizModel().isCulling()) {
gl.glEnable(GL2.GL_CULL_FACE);
gl.glCullFace(GL2.GL_BACK);
}
// 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[hit];
nodeHit.visible = true;
visibleLeaves++;
}
if (minDepth != -1) {
Octant closestOctant = leaves[minDepth];
Vec3f pos =
new Vec3f(closestOctant.getPosX(), closestOctant.getPosY(), closestOctant.getPosZ());
limits.setClosestPoint(pos);
}
}
}
/*
* The nine squares are drawn. In selection mode, each square is given two
* names: one for the row and the other for the column on the grid. The
* color of each square is determined by its position on the grid, and the
* value in the board[][] array.
*/
private void drawSquares(GL2 gl, int mode) {
int i, j;
for (i = 0; i < 3; i++) {
if (mode == GL2.GL_SELECT) {
gl.glLoadName(i);
}
for (j = 0; j < 3; j++) {
if (mode == GL2.GL_SELECT) {
gl.glPushName(j);
}
gl.glColor3f((float) i / 3.0f, (float) j / 3.0f, (float) board[i][j] / 3.0f);
gl.glRecti(i, j, i + 1, j + 1);
if (mode == GL2.GL_SELECT) {
gl.glPopName();
}
}
}
}
/*
* The three rectangles are drawn. In selection mode, each rectangle is
* given the same name. Note that each rectangle is drawn with a different z
* value.
*/
private void drawRects(GL2 gl, int mode) {
if (mode == GL2.GL_SELECT) gl.glLoadName(1);
gl.glBegin(GL2.GL_QUADS);
gl.glColor3f(1.0f, 1.0f, 0.0f);
gl.glVertex3i(2, 0, 0);
gl.glVertex3i(2, 6, 0);
gl.glVertex3i(6, 6, 0);
gl.glVertex3i(6, 0, 0);
gl.glColor3f(0.0f, 1.0f, 1.0f);
gl.glVertex3i(3, 2, -1);
gl.glVertex3i(3, 8, -1);
gl.glVertex3i(8, 8, -1);
gl.glVertex3i(8, 2, -1);
gl.glColor3f(1.0f, 0.0f, 1.0f);
gl.glVertex3i(0, 2, -2);
gl.glVertex3i(0, 7, -2);
gl.glVertex3i(5, 7, -2);
gl.glVertex3i(5, 2, -2);
gl.glEnd();
}
public void updateSelectedOctant(GL2 gl, GLU glu, float[] mousePosition, float[] pickRectangle) {
if (visibleLeaves > 0) {
// Start Picking mode
int capacity = 1 * 4 * visibleLeaves; // Each object take in maximium : 4 * name stack depth
IntBuffer hitsBuffer = Buffers.newDirectIntBuffer(capacity);
gl.glSelectBuffer(hitsBuffer.capacity(), hitsBuffer);
gl.glRenderMode(GL2.GL_SELECT);
gl.glDisable(GL2.GL_CULL_FACE); // Disable flags
gl.glInitNames();
gl.glPushName(0);
gl.glMatrixMode(GL2.GL_PROJECTION);
gl.glPushMatrix();
gl.glLoadIdentity();
glu.gluPickMatrix(
mousePosition[0],
mousePosition[1],
pickRectangle[0],
pickRectangle[1],
drawable.getViewport());
gl.glMultMatrixf(drawable.getProjectionMatrix());
gl.glMatrixMode(GL2.GL_MODELVIEW);
// Draw the nodes' cube int the select buffer
List<Octant> visibleLeaves = new ArrayList<Octant>();
for (Octant n : leaves) {
if (n != null && n.visible) {
int i = visibleLeaves.size() + 1;
visibleLeaves.add(n);
gl.glLoadName(i);
n.displayOctant(gl);
}
}
// Restoring the original projection matrix
gl.glMatrixMode(GL2.GL_PROJECTION);
gl.glPopMatrix();
gl.glMatrixMode(GL2.GL_MODELVIEW);
gl.glFlush();
// Returning to normal rendering mode
int nbRecords = gl.glRenderMode(GL2.GL_RENDER);
if (vizController.getVizModel().isCulling()) {
gl.glEnable(GL2.GL_CULL_FACE);
gl.glCullFace(GL2.GL_BACK);
}
// Clean previous selection
selectedLeaves.clear();
// Get the hits and put the node under selection in the selectionArray
for (int i = 0; i < nbRecords; i++) {
int hit = hitsBuffer.get(i * 4 + 3) - 1; // -1 Because of the glPushName(0)
Octant nodeHit = visibleLeaves.get(hit);
selectedLeaves.add(nodeHit);
}
}
}
