v1.4.4

source/game/StarCollisionGenerator.hpp

@@ -0,0 +1,50 @@
+#ifndef STAR_COLLISION_GENERATOR_HPP
+#define STAR_COLLISION_GENERATOR_HPP
+
+#include "StarCollisionBlock.hpp"
+#include "StarMultiArray.hpp"
+
+#include <functional>
+
+namespace Star {
+
+STAR_CLASS(CollisionGenerator);
+
+// Turns cell geometry into "smoothed" polygonal geometry.  Used by World to
+// generate ramps and slopes based on tiles.
+class CollisionGenerator {
+public:
+  // The maximum number of spaces away from a block that can influence the
+  // collision geometry of a given block.
+  static int const BlockInfluenceRadius = 2;
+
+  // The Maximum number of blocks that will be generated for a single tile
+  // space.
+  static size_t const MaximumCollisionsPerSpace = 4;
+
+  // Callback function to tell what kind of collision geometry is in a cell.
+  // Will be called up to BlockInfluenceRadius outside of the given query
+  // region.
+  typedef std::function<CollisionKind(int, int)> CollisionKindAccessor;
+
+  void init(CollisionKindAccessor accessor);
+
+  // Get collision geometry for the given block region.
+  List<CollisionBlock> getBlocks(RectI const& region) const;
+
+private:
+  void getBlocksPlatforms(List<CollisionBlock>& output, RectI const& region, CollisionKind kind) const;
+  void getBlocksMarchingSquares(List<CollisionBlock>& output, RectI const& region, CollisionKind kind) const;
+
+  void populateCollisionBuffer(RectI const& region) const;
+  CollisionKind collisionKind(int x, int y) const;
+
+  CollisionKindAccessor m_accessor;
+
+  mutable Vec2I m_collisionBufferCorner;
+  mutable MultiArray<CollisionKind, 2> m_collisionBuffer;
+};
+
+}
+
+#endif