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authorMattes D <github@xoft.cz>2017-05-11 14:34:36 +0200
committerworktycho <work.tycho@gmail.com>2017-05-11 14:34:36 +0200
commit2c3c1f15273835923d9bd4950a19ee88a95ee0f4 (patch)
treecda390aa07a202497271439c2b330643074239df /src/LineBlockTracer.cpp
parentExported cFallingBlock and cExpOrb (#3700) (diff)
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Diffstat (limited to 'src/LineBlockTracer.cpp')
-rw-r--r--src/LineBlockTracer.cpp94
1 files changed, 93 insertions, 1 deletions
diff --git a/src/LineBlockTracer.cpp b/src/LineBlockTracer.cpp
index c2e078faf..42e827cb9 100644
--- a/src/LineBlockTracer.cpp
+++ b/src/LineBlockTracer.cpp
@@ -8,6 +8,7 @@
#include "Vector3.h"
#include "World.h"
#include "Chunk.h"
+#include "BoundingBox.h"
@@ -31,7 +32,7 @@ cLineBlockTracer::cLineBlockTracer(cWorld & a_World, cCallbacks & a_Callbacks) :
m_CurrentX(0),
m_CurrentY(0),
m_CurrentZ(0),
- m_CurrentFace(0)
+ m_CurrentFace(BLOCK_FACE_NONE)
{
}
@@ -49,6 +50,97 @@ bool cLineBlockTracer::Trace(cWorld & a_World, cBlockTracer::cCallbacks & a_Call
+bool cLineBlockTracer::LineOfSightTrace(cWorld & a_World, const Vector3d & a_Start, const Vector3d & a_End, int a_Sight)
+{
+ static class LineOfSightCallbacks:
+ public cLineBlockTracer::cCallbacks
+ {
+ bool m_IsAirOpaque;
+ bool m_IsWaterOpaque;
+ bool m_IsLavaOpaque;
+ public:
+ LineOfSightCallbacks(bool a_IsAirOpaque, bool a_IsWaterOpaque, bool a_IsLavaOpaque):
+ m_IsAirOpaque(a_IsAirOpaque),
+ m_IsWaterOpaque(a_IsWaterOpaque),
+ m_IsLavaOpaque(a_IsLavaOpaque)
+ {}
+
+ virtual bool OnNextBlock(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta, eBlockFace a_EntryFace) override
+ {
+ switch (a_BlockType)
+ {
+ case E_BLOCK_AIR: return m_IsAirOpaque;
+ case E_BLOCK_LAVA: return m_IsLavaOpaque;
+ case E_BLOCK_STATIONARY_LAVA: return m_IsLavaOpaque;
+ case E_BLOCK_STATIONARY_WATER: return m_IsWaterOpaque;
+ case E_BLOCK_WATER: return m_IsWaterOpaque;
+ default: return true;
+ }
+ }
+ } callbacks(
+ (a_Sight & losAir) == 0,
+ (a_Sight & losWater) == 0,
+ (a_Sight & losLava) == 0
+ );
+ return Trace(a_World, callbacks, a_Start, a_End);
+}
+
+
+
+
+
+bool cLineBlockTracer::FirstSolidHitTrace(
+ cWorld & a_World,
+ const Vector3d & a_Start, const Vector3d & a_End,
+ Vector3d & a_HitCoords,
+ Vector3i & a_HitBlockCoords, eBlockFace & a_HitBlockFace
+)
+{
+ class cSolidHitCallbacks:
+ public cCallbacks
+ {
+ public:
+ cSolidHitCallbacks(const Vector3d & a_CBStart, const Vector3d & a_CBEnd, Vector3d & a_CBHitCoords, Vector3i & a_CBHitBlockCoords, eBlockFace & a_CBHitBlockFace):
+ m_Start(a_CBStart),
+ m_End(a_CBEnd),
+ m_HitCoords(a_CBHitCoords),
+ m_HitBlockCoords(a_CBHitBlockCoords),
+ m_HitBlockFace(a_CBHitBlockFace)
+ {
+ }
+
+ virtual bool OnNextBlock(int a_BlockX, int a_BlockY, int a_BlockZ, BLOCKTYPE a_BlockType, NIBBLETYPE a_BlockMeta, eBlockFace a_EntryFace) override
+ {
+ if (!cBlockInfo::IsSolid(a_BlockType))
+ {
+ return false;
+ }
+
+ // We hit a solid block, calculate the exact hit coords and abort trace:
+ m_HitBlockCoords.Set(a_BlockX, a_BlockY, a_BlockZ);
+ m_HitBlockFace = a_EntryFace;
+ cBoundingBox bb(a_BlockX, a_BlockX + 1, a_BlockY, a_BlockY + 1, a_BlockZ, a_BlockZ + 1); // Bounding box of the block hit
+ double LineCoeff = 0; // Used to calculate where along the line an intersection with the bounding box occurs
+ eBlockFace Face; // Face hit
+ VERIFY(bb.CalcLineIntersection(m_Start, m_End, LineCoeff, Face));
+ m_HitCoords = m_Start + (m_End - m_Start) * LineCoeff; // Point where projectile goes into the hit block
+ return true;
+ }
+
+ protected:
+ const Vector3d & m_Start;
+ const Vector3d & m_End;
+ Vector3d & m_HitCoords;
+ Vector3i & m_HitBlockCoords;
+ eBlockFace & m_HitBlockFace;
+ } callbacks(a_Start, a_End, a_HitCoords, a_HitBlockCoords, a_HitBlockFace);
+ return !Trace(a_World, callbacks, a_Start, a_End);
+}
+
+
+
+
+
bool cLineBlockTracer::Trace(cWorld & a_World, cBlockTracer::cCallbacks &a_Callbacks, double a_StartX, double a_StartY, double a_StartZ, double a_EndX, double a_EndY, double a_EndZ)
{
cLineBlockTracer Tracer(a_World, a_Callbacks);