1 files changed, 28 insertions, 0 deletions

diff --git a/src/LightingThread.cpp b/src/LightingThread.cpp
index 53f6b2d86..426de86ac 100644
--- a/src/LightingThread.cpp
+++ b/src/LightingThread.cpp
@@ -7,6 +7,7 @@
 #include "LightingThread.h"
 #include "ChunkMap.h"
 #include "World.h"
+#include "BlockInfo.h"
 
 
 
@@ -541,6 +542,33 @@ void cLightingThread::CompressLight(NIBBLETYPE * a_LightArray, NIBBLETYPE * a_Ch
 
 
 
+void cLightingThread::PropagateLight(
+	NIBBLETYPE * a_Light,
+	unsigned int a_SrcIdx, unsigned int a_DstIdx,
+	size_t & a_NumSeedsOut, unsigned char * a_IsSeedOut, unsigned int * a_SeedIdxOut
+)
+{
+	ASSERT(a_SrcIdx < ARRAYCOUNT(m_SkyLight));
+	ASSERT(a_DstIdx < ARRAYCOUNT(m_BlockTypes));
+
+	if (a_Light[a_SrcIdx] <= a_Light[a_DstIdx] + cBlockInfo::GetSpreadLightFalloff(m_BlockTypes[a_DstIdx]))
+	{
+		// We're not offering more light than the dest block already has
+		return;
+	}
+
+	a_Light[a_DstIdx] = a_Light[a_SrcIdx] - cBlockInfo::GetSpreadLightFalloff(m_BlockTypes[a_DstIdx]);
+	if (!a_IsSeedOut[a_DstIdx])
+	{
+		a_IsSeedOut[a_DstIdx] = true;
+		a_SeedIdxOut[a_NumSeedsOut++] = a_DstIdx;
+	}
+}
+
+
+
+
+
 void cLightingThread::QueueChunkStay(cLightingChunkStay & a_ChunkStay)
 {
 	// Move the ChunkStay from the Pending queue to the lighting queue.