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App/voxel/Grid.Chunk.h

@@ -0,0 +1,73 @@
+#pragma once
+// suffix header file for Grid.h
+
+#include "Util/SpatialRegion.h"
+#include "Voxel/Water.h"
+
+namespace RBX { namespace Voxel {
+
+// Private storage structure supporting Grid.
+// NOT TO BE USED ANYWHERE EXCEPT Grid.cpp AND Grid.h.
+// Stores a contiguous 3-D box of terrain contents. Namespace contains
+// constants and helper methods for accessing the data.
+class Grid::Chunk {
+
+private:
+	
+	bool initialized;
+	unsigned int countOfNonEmptyCells;
+	std::vector<Cell> data;
+	std::vector<unsigned char> material;
+	const Grid* owner;
+
+	static const int kXOffsetMultiplier = 1;
+	static const int kZOffsetMultiplier =
+		SpatialRegion::Constants::kRegionXDimensionInVoxels;
+	static const int kYOffsetMultiplier =
+		SpatialRegion::Constants::kRegionXDimensionInVoxels *
+		SpatialRegion::Constants::kRegionZDimensionInVoxels;
+
+public:
+
+	static const int kFaceDirectionToPointerOffset[7];
+
+	static inline int voxelCoordOffsetToIndexOffset(const Vector3int16& offset) {
+		return (offset * Vector3int16(kXOffsetMultiplier, kYOffsetMultiplier, kZOffsetMultiplier)).sum();
+	}
+
+	static inline unsigned int voxelCoordToArrayIndex(const Vector3int16& coord) {
+		return voxelCoordOffsetToIndexOffset(
+				SpatialRegion::voxelCoordinateRelativeToEnclosingRegion(coord));
+	}
+
+	Chunk();
+    ~Chunk();
+
+	// Initialization method. Safe to call multiple times. This object owns
+	// a significant amount of memory, so a separate init method was made to
+	// allow explicit control over when that memory is allocated.
+	void init(const Grid* owner);
+
+	std::vector<Cell>& getData() { return data; }
+	const std::vector<Cell>& getConstData() const { return data; }
+	std::vector<unsigned char>& getMaterial() { return material; }
+	const std::vector<unsigned char>& getConstMaterial() const { return material; }
+
+	void updateCountOfNonEmptyCells(int delta) {
+		countOfNonEmptyCells += delta;
+		RBXASSERT((int)(countOfNonEmptyCells) >= 0);
+	}
+	bool hasNoUsefulData() const {
+		return countOfNonEmptyCells == 0;
+	}
+
+	// for water
+	void fillLocalAreaInfo(const Vector3int16& centerCoord,
+			const Water::RelevantNeighbors& relevantNeighbors,
+			Water::LocalAreaInfo* out) const {
+		return owner->fillLocalAreaInfo(centerCoord, relevantNeighbors, out);
+	}
+};
+
+} }
+