1 files changed, 115 insertions, 0 deletions
diff --git a/source/game/StarParticleManager.cpp b/source/game/StarParticleManager.cpp
new file mode 100644
index 0000000..c19eab6
--- /dev/null
+++ b/source/game/StarParticleManager.cpp
@@ -0,0 +1,115 @@
+#include "StarParticleManager.hpp"
+#include "StarIterator.hpp"
+#include "StarLogging.hpp"
+
+namespace Star {
+
+ParticleManager::ParticleManager(WorldGeometry const& worldGeometry, ClientTileSectorArrayPtr const& tileSectorArray)
+  : m_worldGeometry(worldGeometry), m_undergroundLevel(0.0f), m_tileSectorArray(tileSectorArray) {}
+
+void ParticleManager::add(Particle particle) {
+  m_particles.push_back(move(particle));
+}
+
+void ParticleManager::addParticles(List<Particle> particles) {
+  m_particles.appendAll(move(particles));
+}
+
+size_t ParticleManager::count() const {
+  return m_particles.size();
+}
+
+void ParticleManager::clear() {
+  m_particles.clear();
+}
+
+void ParticleManager::setUndergroundLevel(float undergroundLevel) {
+  m_undergroundLevel = undergroundLevel;
+}
+
+void ParticleManager::update(float dt, RectF const& cullRegion, float wind) {
+  if (!m_tileSectorArray)
+    return;
+
+  auto cullRects = m_worldGeometry.splitRect(cullRegion);
+
+  for (auto& particle : m_particles) {
+    bool inRegion = false;
+    Vec2F worldPos = m_worldGeometry.xwrap(particle.position);
+    for (auto cullRect : cullRects) {
+      if (cullRect.contains(worldPos)) {
+        inRegion = true;
+        break;
+      }
+    }
+    if (!inRegion)
+      continue;
+
+    particle.update(dt, Vec2F(wind, 0));
+    Vec2I pos(particle.position.floor());
+    TileType tiletype;
+    auto const& tile = m_tileSectorArray->tile(pos);
+    if (isSolidColliding(tile.collision))
+      tiletype = TileType::Colliding;
+    else if (tile.liquid.level > 0.5f)
+      tiletype = TileType::Water;
+    else
+      tiletype = TileType::Empty;
+
+    if (particle.collidesForeground && tiletype == TileType::Colliding) {
+      RectF colRect;
+      colRect.setXMax(std::ceil(particle.position[0]));
+      colRect.setXMin(std::floor(particle.position[0]));
+      colRect.setYMax(std::ceil(particle.position[1]));
+      colRect.setYMin(std::floor(particle.position[1]));
+      Line2F colLine(particle.position, particle.position - particle.velocity);
+
+      auto collisionPosition = colRect.edgeIntersection(colLine).point;
+      if (particle.position[0] > colRect.center()[0])
+        collisionPosition[0] += 0.1f;
+      else if (particle.position[0] < colRect.center()[0])
+        collisionPosition[0] -= 0.1f;
+      if (particle.position[1] > colRect.center()[1])
+        collisionPosition[1] += 0.1f;
+      else if (particle.position[1] < colRect.center()[1])
+        collisionPosition[1] -= 0.1f;
+
+      particle.collide(collisionPosition);
+    }
+
+    if (particle.underwaterOnly && tiletype == TileType::Empty)
+      particle.destroy(false);
+
+    if (particle.collidesLiquid && tiletype == TileType::Water)
+      particle.destroy(false);
+
+    if (particle.trail && particle.timeToLive >= 0.0f) {
+      auto trail = particle;
+      trail.trail = false;
+      trail.timeToLive = 0;
+      trail.velocity = {};
+      m_nextParticles.append(move(trail));
+    }
+
+    if (!particle.dead())
+      m_nextParticles.append(move(particle));
+  }
+
+  m_particles.clear();
+  swap(m_particles, m_nextParticles);
+}
+
+List<Particle> const& ParticleManager::particles() const {
+  return m_particles;
+}
+
+List<pair<Vec2F, Vec3B>> ParticleManager::lightSources() const {
+  List<pair<Vec2F, Vec3B>> lsources;
+  for (auto const& particle : m_particles) {
+    if (particle.light != Color::Clear)
+      lsources.append({particle.position, particle.light.toRgb()});
+  }
+  return lsources;
+}
+
+}