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// LineBlockTracer.h
// Declares the LineBlockTracer namespace representing a tracer that visits every block along a straight line between two points
#pragma once
#include "BlockTracer.h"
class cChunk;
class cWorld;
namespace LineBlockTracer
{
/* Bit flags used for LineOfSightTrace's Sight parameter. */
enum LineOfSight
{
Air = 1, // Can see through air.
Water = 2, // Can see through water.
Lava = 4, // Can see through lava.
// Common combinations:
AirWaterLava = Air | Water | Lava,
AirWater = Air | Water,
};
/** Traces one line between Start and End; returns true if the entire line was traced (until OnNoMoreHits()) */
bool Trace(const cChunk & a_Chunk, BlockTracerCallbacks & a_Callbacks, Vector3d a_Start, Vector3d a_End);
/** Traces one line between Start and End; returns true if the entire line was traced (until OnNoMoreHits()) */
bool Trace(cWorld & a_World, BlockTracerCallbacks & a_Callbacks, const Vector3d a_Start, const Vector3d a_End);
/** Returns true if the two positions are within line of sight (not obscured by blocks).
a_Sight specifies which blocks are considered transparent for the trace, is an OR-combination of eLineOfSight constants. */
bool LineOfSightTrace(cWorld & a_World, const Vector3d & a_Start, const Vector3d & a_End, LineOfSight a_Sight);
/** Traces until the first solid block is hit (or until end, whichever comes first.
If a solid block was hit, returns true and fills a_HitCoords, a_HitBlockCoords and a_HitBlockFace.
If a_End is encountered without hitting any solid block, returns false and doesn't touch a_HitCoords, a_HitBlockCoords nor a_HitBlockFace.
a_HitCoords is the exact coords of the hit,
a_HitBlockCoords are the coords of the solid block that was hit,
a_HitBlockFace is the face of the solid block that was hit. */
bool FirstSolidHitTrace(
cWorld & a_World,
const Vector3d & a_Start, const Vector3d & a_End,
Vector3d & a_HitCoords,
Vector3i & a_HitBlockCoords,
eBlockFace & a_HitBlockFace
);
}
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