void
BSPTree::BuildDrawOrder(const UniquePtr<BSPTreeNode>& aNode,
nsTArray<LayerPolygon>& aLayers) const
{
const gfx::Point3D& normal = aNode->First().GetNormal();
UniquePtr<BSPTreeNode> *front = &aNode->front;
UniquePtr<BSPTreeNode> *back = &aNode->back;
// Since the goal is to return the draw order from back to front, we reverse
// the traversal order if the current polygon is facing towards the camera.
const bool reverseOrder = normal.z > 0.0f;
if (reverseOrder) {
std::swap(front, back);
}
if (*front) {
BuildDrawOrder(*front, aLayers);
}
for (LayerPolygon& layer : aNode->layers) {
MOZ_ASSERT(layer.geometry);
if (layer.geometry->GetPoints().Length() >= 3) {
aLayers.AppendElement(Move(layer));
}
}
if (*back) {
BuildDrawOrder(*back, aLayers);
}
}
void
BSPTree::BuildDrawOrder(const UniquePtr<BSPTreeNode>& aNode,
nsTArray<gfx::Polygon3D>& aPolygons) const
{
const gfx::Point3D& normal = aNode->First().GetNormal();
UniquePtr<BSPTreeNode> *front = &aNode->front;
UniquePtr<BSPTreeNode> *back = &aNode->back;
// Since the goal is to return the draw order from back to front, we reverse
// the traversal order if the current polygon is facing towards the camera.
const bool reverseOrder = normal.z > 0.0f;
if (reverseOrder) {
std::swap(front, back);
}
if (*front) {
BuildDrawOrder(*front, aPolygons);
}
for (gfx::Polygon3D& polygon : aNode->polygons) {
aPolygons.AppendElement(std::move(polygon));
}
if (*back) {
BuildDrawOrder(*back, aPolygons);
}
}
void
BSPTree::BuildTree(UniquePtr<BSPTreeNode>& aRoot,
std::deque<LayerPolygon>& aLayers)
{
if (aLayers.empty()) {
return;
}
const gfx::Polygon& plane = aRoot->First();
std::deque<LayerPolygon> backLayers, frontLayers;
for (LayerPolygon& layerPolygon : aLayers) {
const Maybe<gfx::Polygon>& geometry = layerPolygon.geometry;
size_t pos = 0, neg = 0;
nsTArray<float> dots = geometry->CalculateDotProducts(plane, pos, neg);
// Back polygon
if (pos == 0 && neg > 0) {
backLayers.push_back(Move(layerPolygon));
}
// Front polygon
else if (pos > 0 && neg == 0) {
frontLayers.push_back(Move(layerPolygon));
}
// Coplanar polygon
else if (pos == 0 && neg == 0) {
aRoot->layers.push_back(Move(layerPolygon));
}
// Polygon intersects with the splitting plane.
else if (pos > 0 && neg > 0) {
nsTArray<gfx::Point4D> backPoints, frontPoints;
geometry->SplitPolygon(plane.GetNormal(), dots, backPoints, frontPoints);
const gfx::Point4D& normal = geometry->GetNormal();
Layer *layer = layerPolygon.layer;
if (backPoints.Length() >= 3) {
backLayers.push_back(LayerPolygon(layer, Move(backPoints), normal));
}
if (frontPoints.Length() >= 3) {
frontLayers.push_back(LayerPolygon(layer, Move(frontPoints), normal));
}
}
}
if (!backLayers.empty()) {
aRoot->back.reset(new BSPTreeNode(PopFront(backLayers)));
BuildTree(aRoot->back, backLayers);
}
if (!frontLayers.empty()) {
aRoot->front.reset(new BSPTreeNode(PopFront(frontLayers)));
BuildTree(aRoot->front, frontLayers);
}
}
void
BSPTree::BuildTree(UniquePtr<BSPTreeNode>& aRoot,
std::deque<gfx::Polygon3D>& aPolygons)
{
if (aPolygons.empty()) {
return;
}
const gfx::Polygon3D& splittingPlane = aRoot->First();
std::deque<gfx::Polygon3D> backPolygons, frontPolygons;
for (gfx::Polygon3D& polygon : aPolygons) {
size_t pos = 0, neg = 0;
nsTArray<float> dots = CalculateDotProduct(splittingPlane, polygon,
pos, neg);
// Back polygon
if (pos == 0 && neg > 0) {
backPolygons.push_back(std::move(polygon));
}
// Front polygon
else if (pos > 0 && neg == 0) {
frontPolygons.push_back(std::move(polygon));
}
// Coplanar polygon
else if (pos == 0 && neg == 0) {
aRoot->polygons.push_back(std::move(polygon));
}
// Polygon intersects with the splitting plane.
else if (pos > 0 && neg > 0) {
nsTArray<gfx::Point3D> backPoints, frontPoints;
SplitPolygon(splittingPlane, polygon, dots, backPoints, frontPoints);
backPolygons.push_back(gfx::Polygon3D(std::move(backPoints)));
frontPolygons.push_back(gfx::Polygon3D(std::move(frontPoints)));
}
}
if (!backPolygons.empty()) {
aRoot->back.reset(new BSPTreeNode(PopFront(backPolygons)));
BuildTree(aRoot->back, backPolygons);
}
if (!frontPolygons.empty()) {
aRoot->front.reset(new BSPTreeNode(PopFront(frontPolygons)));
BuildTree(aRoot->front, frontPolygons);
}
}