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