4 files changed, 140 insertions, 2 deletions

diff --git a/src/Generating/ComposableGenerator.cpp b/src/Generating/ComposableGenerator.cpp
index 4a670b064..846e6fe12 100644
--- a/src/Generating/ComposableGenerator.cpp
+++ b/src/Generating/ComposableGenerator.cpp
@@ -347,6 +347,10 @@ void cComposableGenerator::InitFinishGens(cIniFile & a_IniFile)
 			AString HeightDistrib = a_IniFile.GetValueSet ("Generator", "DungeonRoomsHeightDistrib", "0, 0; 10, 10; 11, 500; 40, 500; 60, 40; 90, 1");
 			m_FinishGens.push_back(cFinishGenPtr(new cDungeonRoomsFinisher(m_ShapeGen, Seed, GridSize, MaxSize, MinSize, HeightDistrib)));
 		}
+		else if (NoCaseCompare(*itr, "GlowStone") == 0)
+		{
+			m_FinishGens.push_back(cFinishGenPtr(new cFinishGenGlowStone(Seed)));
+		}
 		else if (NoCaseCompare(*itr, "Ice") == 0)
 		{
 			m_FinishGens.push_back(cFinishGenPtr(new cFinishGenIce));
diff --git a/src/Generating/FinishGen.cpp b/src/Generating/FinishGen.cpp
index 5839a4ccc..7541c8598 100644
--- a/src/Generating/FinishGen.cpp
+++ b/src/Generating/FinishGen.cpp
@@ -180,6 +180,118 @@ void cFinishGenNetherClumpFoliage::TryPlaceClump(cChunkDesc & a_ChunkDesc, int a
 
 
 ////////////////////////////////////////////////////////////////////////////////
+// cFinishGenGlowStone:
+
+void cFinishGenGlowStone::GenFinish(cChunkDesc & a_ChunkDesc)
+{
+	int ChunkX = a_ChunkDesc.GetChunkX();
+	int ChunkZ = a_ChunkDesc.GetChunkZ();
+	
+	// Change the number of attempts to create a vein depending on the maximum height of the chunk. A standard Nether could have 5 veins at most.
+	int NumGlowStone = m_Noise.IntNoise2DInt(ChunkX, ChunkZ) % a_ChunkDesc.GetMaxHeight() / 23;
+
+	for (int i = 1; i <= NumGlowStone; i++)
+	{
+		// The maximum size for a string of glowstone can get 3 - 5 blocks long
+		int Size = 3 + m_Noise.IntNoise3DInt(ChunkX, i, ChunkZ) % 3;
+
+		// Generate X/Z coordinates.
+		int X = Size + (m_Noise.IntNoise2DInt(i, Size) % (cChunkDef::Width - Size * 2));
+		int Z = Size + (m_Noise.IntNoise2DInt(X, i)    % (cChunkDef::Width - Size * 2));
+		
+		int Height = a_ChunkDesc.GetHeight(X, Z);
+		for (int y = Height; y > Size; y--)
+		{
+			if (!cBlockInfo::IsSolid(a_ChunkDesc.GetBlockType(X, y, Z)))
+			{
+				// Current block isn't solid, bail out
+				continue;
+			}
+
+			if (a_ChunkDesc.GetBlockType(X, y - 1, Z) != E_BLOCK_AIR)
+			{
+				// The block below isn't air, bail out
+				continue;
+			}
+
+			if ((m_Noise.IntNoise3DInt(X, y, Z) % 100) < 95)
+			{
+				// Have a 5% chance of creating the glowstone
+				continue;
+			}
+
+			TryPlaceGlowstone(a_ChunkDesc, X, y, Z, Size, 5 + m_Noise.IntNoise3DInt(X, y, Z) % 7);
+			break;
+		}
+	}
+}
+
+
+
+
+
+void cFinishGenGlowStone::TryPlaceGlowstone(cChunkDesc & a_ChunkDesc, int a_RelX, int a_RelY, int a_RelZ, int a_Size, int a_NumStrings)
+{
+	// The starting point of every glowstone string
+	Vector3i StartPoint = Vector3i(a_RelX, a_RelY, a_RelZ);
+	
+	// Array with possible directions for a string of glowstone to go to.
+	const Vector3i AvailableDirections[] =
+	{
+		{ -1,  0,  0 }, { 1, 0, 0 },
+		{  0, -1,  0 },  // Don't let the glowstone go up
+		{  0,  0, -1 }, { 0, 0, 1 },
+		
+		// Diagonal direction. Only X or Z with Y.
+		// If all were changed the glowstone string looks awkward
+		{ 0, -1,  1 }, {  1, -1, 0 },
+		{ 0, -1, -1 }, { -1, -1, 0 },
+
+	};
+
+	for (int i = 1; i <= a_NumStrings; i++)
+	{
+		// The current position of the string that is being generated
+		Vector3i CurrentPos = Vector3i(StartPoint);
+
+		// A vector where the previous direction of a glowstone string is stored.
+		// This is used to make the strings change direction when going one block further
+		Vector3i PreviousDirection = Vector3i();
+
+		for (int j = 0; j < a_Size; j++)
+		{
+			Vector3i Direction = AvailableDirections[m_Noise.IntNoise3DInt(CurrentPos.x, CurrentPos.y * i, CurrentPos.z) % ARRAYCOUNT(AvailableDirections)];
+			int Attempts = 2;  // multiply by 1 would make no difference, so multiply by 2 instead
+
+			while (Direction.Equals(PreviousDirection))
+			{
+				// To make the glowstone branches look better we want to make the direction change every time.
+				Direction = AvailableDirections[m_Noise.IntNoise3DInt(CurrentPos.x, CurrentPos.y * i * Attempts, CurrentPos.z) % ARRAYCOUNT(AvailableDirections)];
+				Attempts++;
+			}
+
+			// Update the previous direction variable
+			PreviousDirection = Direction;
+
+			// Update the position of the glowstone string
+			CurrentPos += Direction;
+			if (cBlockInfo::IsSolid(a_ChunkDesc.GetBlockType(CurrentPos.x, CurrentPos.y, CurrentPos.z)) && (a_ChunkDesc.GetBlockType(CurrentPos.x, CurrentPos.y, CurrentPos.z) != E_BLOCK_GLOWSTONE))
+			{
+				// The glowstone hit something solid, and it wasn't glowstone. Stop the string.
+				break;
+			}
+
+			// Place a glowstone block.
+			a_ChunkDesc.SetBlockType(CurrentPos.x, CurrentPos.y, CurrentPos.z, E_BLOCK_GLOWSTONE);
+		}
+	}
+}
+
+
+
+
+
+////////////////////////////////////////////////////////////////////////////////
 // cFinishGenTallGrass:
 
 void cFinishGenTallGrass::GenFinish(cChunkDesc & a_ChunkDesc)
@@ -523,7 +635,7 @@ void cFinishGenSoulsandRims::GenFinish(cChunkDesc & a_ChunkDesc)
 			{
 				// The current block is air. Let's bail ut.
 				BLOCKTYPE Block = a_ChunkDesc.GetBlockType(x, y, z);
-				if (Block == E_BLOCK_AIR)
+				if (Block != E_BLOCK_NETHERRACK)
 				{
 					continue;
 				}
diff --git a/src/Generating/FinishGen.h b/src/Generating/FinishGen.h
index 70696c4f8..aa50335d4 100644
--- a/src/Generating/FinishGen.h
+++ b/src/Generating/FinishGen.h
@@ -70,6 +70,28 @@ protected:
 
 
 
+class cFinishGenGlowStone :
+	public cFinishGen
+{
+public:
+	cFinishGenGlowStone(int a_Seed) :
+		m_Noise(a_Seed),
+		m_Seed(a_Seed)
+	{
+	}
+
+protected:
+	cNoise m_Noise;
+	int    m_Seed;
+
+	void TryPlaceGlowstone(cChunkDesc & a_ChunkDesc, int a_RelX, int a_RelY, int a_RelZ, int a_Size, int a_NumStrings);
+	virtual void GenFinish(cChunkDesc & a_ChunkDesc) override;
+} ;
+
+
+
+
+
 class cFinishGenTallGrass :
 	public cFinishGen
 {
diff --git a/src/World.cpp b/src/World.cpp
index 4480013c3..a088f6eb1 100644
--- a/src/World.cpp
+++ b/src/World.cpp
@@ -812,7 +812,7 @@ void cWorld::InitialiseGeneratorDefaults(cIniFile & a_IniFile)
 			a_IniFile.GetValueSet("Generator", "HeightGen",        "Flat");
 			a_IniFile.GetValueSet("Generator", "FlatHeight",       "128");
 			a_IniFile.GetValueSet("Generator", "CompositionGen",   "Nether");
-			a_IniFile.GetValueSet("Generator", "Finishers",        "SoulsandRims, WormNestCaves, BottomLava, LavaSprings, NetherClumpFoliage, NetherOreNests, NetherForts, PreSimulator");
+			a_IniFile.GetValueSet("Generator", "Finishers",        "SoulsandRims, WormNestCaves, BottomLava, LavaSprings, NetherClumpFoliage, NetherOreNests, NetherForts, GlowStone, PreSimulator");
 			a_IniFile.GetValueSet("Generator", "BottomLavaHeight", "30");
 			break;
 		}