1 files changed, 318 insertions, 0 deletions

diff --git a/src/Generating/RoughRavines.cpp b/src/Generating/RoughRavines.cpp
new file mode 100644
index 000000000..badc7768e
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+++ b/src/Generating/RoughRavines.cpp
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+
+// RoughRavines.cpp
+
+// Implements the cRoughRavines class representing the rough ravine generator
+
+#include "Globals.h"
+
+#include "RoughRavines.h"
+
+
+
+
+
+////////////////////////////////////////////////////////////////////////////////
+// cRoughRavine:
+
+class cRoughRavine :
+	public cGridStructGen::cStructure
+{
+	typedef cGridStructGen::cStructure super;
+	
+public:
+	cRoughRavine(
+		int a_Seed, int a_Size,
+		float a_CenterWidth, float a_Roughness,
+		float a_FloorHeightEdge1,   float a_FloorHeightEdge2,   float a_FloorHeightCenter,
+		float a_CeilingHeightEdge1, float a_CeilingHeightEdge2, float a_CeilingHeightCenter,
+		int a_GridX, int a_GridZ, int a_OriginX, int a_OriginZ
+	) :
+		super(a_GridX, a_GridZ, a_OriginX, a_OriginZ),
+		m_Seed(a_Seed + 100),
+		m_Noise(a_Seed + 100),
+		m_Roughness(a_Roughness)
+	{
+		// Create the basic structure - 2 lines meeting at the centerpoint:
+		int Max = 2 * a_Size;
+		int Half = a_Size;  // m_DefPoints[Half] will be the centerpoint
+		m_DefPoints.resize(Max + 1);
+		int rnd = m_Noise.IntNoise2DInt(a_OriginX, a_OriginZ) / 7;
+		float Len = (float)a_Size;
+		float Angle = (float)rnd;  // Angle is in radians, will be wrapped in the "sin" and "cos" operations
+		float OfsX = sin(Angle) * Len;
+		float OfsZ = cos(Angle) * Len;
+		m_DefPoints[0].Set   (a_OriginX - OfsX, a_OriginZ - OfsZ, 1,             a_CeilingHeightEdge1,  a_FloorHeightEdge1);
+		m_DefPoints[Half].Set((float)a_OriginX, (float)a_OriginZ, a_CenterWidth, a_CeilingHeightCenter, a_FloorHeightCenter);
+		m_DefPoints[Max].Set (a_OriginX + OfsX, a_OriginZ + OfsZ, 1,             a_CeilingHeightEdge2,  a_FloorHeightEdge2);
+		
+		// Calculate the points in between, recursively:
+		SubdivideLine(0, Half);
+		SubdivideLine(Half, Max);
+		
+		// Initialize the per-height radius modifiers:
+		InitPerHeightRadius(a_GridX, a_GridZ);
+	}
+	
+protected:
+	struct sRavineDefPoint
+	{
+		float m_X;
+		float m_Z;
+		float m_Radius;
+		float m_Top;
+		float m_Bottom;
+		
+		void Set(float a_X, float a_Z, float a_Radius, float a_Top, float a_Bottom)
+		{
+			m_X = a_X;
+			m_Z = a_Z;
+			m_Radius = a_Radius;
+			m_Top = a_Top;
+			m_Bottom = a_Bottom;
+		}
+	};
+	typedef std::vector<sRavineDefPoint> sRavineDefPoints;
+	
+	int m_Seed;
+	
+	cNoise m_Noise;
+	
+	int m_MaxSize;
+	
+	sRavineDefPoints m_DefPoints;
+	
+	float m_Roughness;
+	
+	/** Number to add to the radius based on the height. This creates the "ledges" in the ravine walls. */
+	float m_PerHeightRadius[cChunkDef::Height];
+	
+	
+	/** Recursively subdivides the line between the points of the specified index.
+	Sets the midpoint to the center of the line plus or minus a random offset, then calls itself for each half
+	of the new line. */
+	void SubdivideLine(int a_Idx1, int a_Idx2)
+	{
+		// Calculate the midpoint:
+		const sRavineDefPoint & p1 = m_DefPoints[a_Idx1];
+		const sRavineDefPoint & p2 = m_DefPoints[a_Idx2];
+		float MidX = (p1.m_X + p2.m_X) / 2;
+		float MidZ = (p1.m_Z + p2.m_Z) / 2;
+		float MidR = (p1.m_Radius + p2.m_Radius) / 2 + 0.1f;
+		float MidT = (p1.m_Top    + p2.m_Top)    / 2;
+		float MidB = (p1.m_Bottom + p2.m_Bottom) / 2;
+
+		// Adjust the midpoint by a small amount of perpendicular vector in a random one of its two directions:
+		float dx = p2.m_X - p1.m_X;
+		float dz = p2.m_Z - p1.m_Z;
+		if ((m_Noise.IntNoise2DInt((int)MidX, (int)MidZ) / 11) % 2 == 0)
+		{
+			MidX += dz * m_Roughness;
+			MidZ -= dx * m_Roughness;
+		}
+		else
+		{
+			MidX -= dz * m_Roughness;
+			MidZ += dx * m_Roughness;
+		}
+		int MidIdx = (a_Idx1 + a_Idx2) / 2;
+		m_DefPoints[MidIdx].Set(MidX, MidZ, MidR, MidT, MidB);
+		
+		// Recurse the two halves, if they are worth recursing:
+		if (MidIdx - a_Idx1 > 1)
+		{
+			SubdivideLine(a_Idx1, MidIdx);
+		}
+		if (a_Idx2 - MidIdx > 1)
+		{
+			SubdivideLine(MidIdx, a_Idx2);
+		}
+	}
+	
+	
+	void InitPerHeightRadius(int a_GridX, int a_GridZ)
+	{
+		int h = 0;
+		while (h < cChunkDef::Height)
+		{
+			m_Noise.SetSeed(m_Seed + h);
+			int rnd = m_Noise.IntNoise2DInt(a_GridX, a_GridZ) / 13;
+			int NumBlocks = (rnd % 3) + 2;
+			rnd = rnd / 4;
+			float Val = (float)(rnd % 256) / 128 - 1;  // Random float in range [-1, +1]
+			if (h + NumBlocks > cChunkDef::Height)
+			{
+				NumBlocks = cChunkDef::Height - h;
+			}
+			for (int i = 0; i < NumBlocks; i++)
+			{
+				m_PerHeightRadius[h + i] = Val;
+			}
+			h += NumBlocks;
+		}
+	}
+	
+	
+	virtual void DrawIntoChunk(cChunkDesc & a_ChunkDesc) override
+	{
+		int BlockStartX = a_ChunkDesc.GetChunkX() * cChunkDef::Width;
+		int BlockStartZ = a_ChunkDesc.GetChunkZ() * cChunkDef::Width;
+		int BlockEndX = BlockStartX + cChunkDef::Width;
+		int BlockEndZ = BlockStartZ + cChunkDef::Width;
+		for (sRavineDefPoints::const_iterator itr = m_DefPoints.begin(), end = m_DefPoints.end(); itr != end; ++itr)
+		{
+			if (
+				(ceilf (itr->m_X + itr->m_Radius + 2) < BlockStartX) ||
+				(floorf(itr->m_X - itr->m_Radius - 2) > BlockEndX) ||
+				(ceilf (itr->m_Z + itr->m_Radius + 2) < BlockStartZ) ||
+				(floorf(itr->m_Z - itr->m_Radius - 2) > BlockEndZ)
+			)
+			{
+				// Cannot intersect, bail out early
+				continue;
+			}
+			
+			// Carve out a cylinder around the xz point, up to (m_Radius + 2) in diameter, from Bottom to Top:
+			// On each height level, use m_PerHeightRadius[] to modify the actual radius used
+			// EnlargedRadiusSq is the square of the radius enlarged by the maximum m_PerHeightRadius offset - anything outside it will never be touched.
+			float RadiusSq = (itr->m_Radius + 2) * (itr->m_Radius + 2);
+			float DifX = BlockStartX - itr->m_X;  // substitution for faster calc
+			float DifZ = BlockStartZ - itr->m_Z;  // substitution for faster calc
+			for (int x = 0; x < cChunkDef::Width; x++) for (int z = 0; z < cChunkDef::Width; z++)
+			{
+				#ifdef _DEBUG
+				// DEBUG: Make the roughravine shapepoints visible on a single layer (so that we can see with Minutor what's going on)
+				if ((DifX + x == 0) && (DifZ + z == 0))
+				{
+					a_ChunkDesc.SetBlockType(x, 4, z, E_BLOCK_LAPIS_ORE);
+				}
+				#endif  // _DEBUG
+				
+				// If the column is outside the enlarged radius, bail out completely
+				float DistSq = (DifX + x) * (DifX + x) + (DifZ + z) * (DifZ + z);
+				if (DistSq > RadiusSq)
+				{
+					continue;
+				}
+				
+				int Top = std::min((int)ceilf(itr->m_Top), +cChunkDef::Height);
+				for (int y = std::max((int)floorf(itr->m_Bottom), 1); y <= Top; y++)
+				{
+					if ((itr->m_Radius + m_PerHeightRadius[y]) * (itr->m_Radius + m_PerHeightRadius[y]) < DistSq)
+					{
+						continue;
+					}
+					switch (a_ChunkDesc.GetBlockType(x, y, z))
+					{
+						// Only carve out these specific block types
+						case E_BLOCK_DIRT:
+						case E_BLOCK_GRASS:
+						case E_BLOCK_STONE:
+						case E_BLOCK_COBBLESTONE:
+						case E_BLOCK_GRAVEL:
+						case E_BLOCK_SAND:
+						case E_BLOCK_SANDSTONE:
+						case E_BLOCK_NETHERRACK:
+						case E_BLOCK_COAL_ORE:
+						case E_BLOCK_IRON_ORE:
+						case E_BLOCK_GOLD_ORE:
+						case E_BLOCK_DIAMOND_ORE:
+						case E_BLOCK_REDSTONE_ORE:
+						case E_BLOCK_REDSTONE_ORE_GLOWING:
+						{
+							a_ChunkDesc.SetBlockType(x, y, z, E_BLOCK_AIR);
+							break;
+						}
+						default: break;
+					}  // switch (BlockType)
+				}  // for y
+			}  // for x, z - a_BlockTypes
+		}  // for itr - m_Points[]
+	}
+};
+
+
+
+
+
+////////////////////////////////////////////////////////////////////////////////
+// cRoughRavines:
+
+cRoughRavines::cRoughRavines(
+	int a_Seed,
+	int a_MaxSize, int a_MinSize,
+	float a_MaxCenterWidth, float a_MinCenterWidth,
+	float a_MaxRoughness,   float a_MinRoughness,
+	float a_MaxFloorHeightEdge,     float a_MinFloorHeightEdge,
+	float a_MaxFloorHeightCenter,   float a_MinFloorHeightCenter,
+	float a_MaxCeilingHeightEdge,   float a_MinCeilingHeightEdge,
+	float a_MaxCeilingHeightCenter, float a_MinCeilingHeightCenter,
+	int a_GridSize, int a_MaxOffset
+) :
+	super(a_Seed, a_GridSize, a_GridSize, a_MaxOffset, a_MaxOffset, a_MaxSize, a_MaxSize, 64),
+	m_Seed(a_Seed),
+	m_MaxSize(a_MaxSize),
+	m_MinSize(a_MinSize),
+	m_MaxCenterWidth(a_MaxCenterWidth),
+	m_MinCenterWidth(a_MinCenterWidth),
+	m_MaxRoughness(a_MaxRoughness),
+	m_MinRoughness(a_MinRoughness),
+	m_MaxFloorHeightEdge(a_MaxFloorHeightEdge),
+	m_MinFloorHeightEdge(a_MinFloorHeightEdge),
+	m_MaxFloorHeightCenter(a_MaxFloorHeightCenter),
+	m_MinFloorHeightCenter(a_MinFloorHeightCenter),
+	m_MaxCeilingHeightEdge(a_MaxCeilingHeightEdge),
+	m_MinCeilingHeightEdge(a_MinCeilingHeightEdge),
+	m_MaxCeilingHeightCenter(a_MaxCeilingHeightCenter),
+	m_MinCeilingHeightCenter(a_MinCeilingHeightCenter)
+{
+	if (m_MinSize > m_MaxSize)
+	{
+		std::swap(m_MinSize, m_MaxSize);
+		std::swap(a_MinSize, a_MaxSize);
+	}
+	if (m_MaxSize < 16)
+	{
+		m_MaxSize = 16;
+		LOGWARNING("RoughRavines: MaxSize too small, adjusting request from %d to %d", a_MaxSize, m_MaxSize);
+	}
+	if (m_MinSize < 16)
+	{
+		m_MinSize = 16;
+		LOGWARNING("RoughRavines: MinSize too small, adjusting request from %d to %d", a_MinSize, m_MinSize);
+	}
+	if (m_MinSize == m_MaxSize)
+	{
+		m_MaxSize = m_MinSize + 1;
+	}
+}
+
+
+
+
+
+cGridStructGen::cStructurePtr cRoughRavines::CreateStructure(int a_GridX, int a_GridZ, int a_OriginX, int a_OriginZ)
+{
+	// Pick a random value for each of the ravine's parameters:
+	int Size = m_MinSize + (m_Noise.IntNoise2DInt(a_GridX, a_GridZ) / 7) % (m_MaxSize - m_MinSize);  // Random int from m_MinSize to m_MaxSize
+	float CenterWidth         = m_Noise.IntNoise2DInRange(a_GridX + 10, a_GridZ, m_MinCenterWidth,         m_MaxCenterWidth);
+	float Roughness           = m_Noise.IntNoise2DInRange(a_GridX + 20, a_GridZ, m_MinRoughness,           m_MaxRoughness);
+	float FloorHeightEdge1    = m_Noise.IntNoise2DInRange(a_GridX + 30, a_GridZ, m_MinFloorHeightEdge,     m_MaxFloorHeightEdge);
+	float FloorHeightEdge2    = m_Noise.IntNoise2DInRange(a_GridX + 40, a_GridZ, m_MinFloorHeightEdge,     m_MaxFloorHeightEdge);
+	float FloorHeightCenter   = m_Noise.IntNoise2DInRange(a_GridX + 50, a_GridZ, m_MinFloorHeightCenter,   m_MaxFloorHeightCenter);
+	float CeilingHeightEdge1  = m_Noise.IntNoise2DInRange(a_GridX + 60, a_GridZ, m_MinCeilingHeightEdge,   m_MaxCeilingHeightEdge);
+	float CeilingHeightEdge2  = m_Noise.IntNoise2DInRange(a_GridX + 70, a_GridZ, m_MinCeilingHeightEdge,   m_MaxCeilingHeightEdge);
+	float CeilingHeightCenter = m_Noise.IntNoise2DInRange(a_GridX + 80, a_GridZ, m_MinCeilingHeightCenter, m_MaxCeilingHeightCenter);
+	
+	// Create a ravine:
+	return cStructurePtr(new cRoughRavine(
+		m_Seed,
+		Size, CenterWidth, Roughness,
+		FloorHeightEdge1,   FloorHeightEdge2,   FloorHeightCenter,
+		CeilingHeightEdge1, CeilingHeightEdge2, CeilingHeightCenter,
+		a_GridX, a_GridZ, a_OriginX, a_OriginZ
+	));
+}
+
+
+
+