v1.4.4

source/game/StarFallingBlocksAgent.cpp

@@ -0,0 +1,81 @@
+#include "StarFallingBlocksAgent.hpp"
+#include "StarRoot.hpp"
+#include "StarAssets.hpp"
+
+namespace Star {
+
+FallingBlocksAgent::FallingBlocksAgent(FallingBlocksFacadePtr worldFacade)
+  : m_facade(move(worldFacade)) {
+  m_immediateUpwardPropagateProbability = Root::singleton().assets()->json("/worldserver.config:fallingBlocksImmediateUpwardPropogateProbability").toFloat();
+}
+
+void FallingBlocksAgent::update() {
+  HashSet<Vec2I> processing = take(m_pending);
+
+  while (!processing.empty()) {
+    List<Vec2I> positions;
+    for (auto const& pos : take(processing))
+      positions.append(pos);
+
+    m_random.shuffle(positions);
+
+    positions.sort([](auto const& a, auto const& b) {
+        return a[1] < b[1];
+      });
+
+    for (auto const& pos : positions) {
+      Vec2I belowPos = pos + Vec2I(0, -1);
+      Vec2I belowLeftPos = pos + Vec2I(-1, -1);
+      Vec2I belowRightPos = pos + Vec2I(1, -1);
+
+      FallingBlockType thisBlock = m_facade->blockType(pos);
+      FallingBlockType belowBlock = m_facade->blockType(belowPos);
+
+      Maybe<Vec2I> moveTo;
+
+      if (thisBlock == FallingBlockType::Falling) {
+        if (belowBlock == FallingBlockType::Open)
+          moveTo = belowPos;
+      } else if (thisBlock == FallingBlockType::Cascading) {
+        if (belowBlock == FallingBlockType::Open) {
+          moveTo = belowPos;
+        } else {
+          FallingBlockType belowLeftBlock = m_facade->blockType(belowLeftPos);
+          FallingBlockType belowRightBlock = m_facade->blockType(belowRightPos);
+
+          if (belowLeftBlock == FallingBlockType::Open && belowRightBlock == FallingBlockType::Open)
+            moveTo = m_random.randb() ? belowLeftPos : belowRightPos;
+          else if (belowLeftBlock == FallingBlockType::Open)
+            moveTo = belowLeftPos;
+          else if (belowRightBlock == FallingBlockType::Open)
+            moveTo = belowRightPos;
+        }
+      }
+
+      if (moveTo) {
+        m_facade->moveBlock(pos, *moveTo);
+        if (m_random.randf() < m_immediateUpwardPropagateProbability) {
+          processing.add(pos + Vec2I(0, 1));
+          processing.add(pos + Vec2I(-1, 1));
+          processing.add(pos + Vec2I(1, 1));
+        }
+
+        visitLocation(pos);
+        visitLocation(*moveTo);
+      }
+    }
+  }
+}
+
+void FallingBlocksAgent::visitLocation(Vec2I const& location) {
+  visitRegion(RectI::withSize(location, Vec2I(1, 1)));
+}
+
+void FallingBlocksAgent::visitRegion(RectI const& region) {
+  for (int x = region.xMin() - 1; x <= region.xMax(); ++x) {
+    for (int y = region.yMin(); y <= region.yMax(); ++y) 
+      m_pending.add({x, y});
+  }
+}
+
+}