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cuberite-2a/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"
#include "../BlockInfo.h"
////////////////////////////////////////////////////////////////////////////////
// cRoughRavine:
class cRoughRavine:
public cGridStructGen::cStructure
{
using Super = cGridStructGen::cStructure;
public:
cRoughRavine(
int a_Seed, size_t 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:
size_t Max = 2 * a_Size;
size_t 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 = static_cast<float>(a_Size);
float Angle = static_cast<float>(rnd); // Angle is in radians, will be wrapped in the "sin" and "cos" operations
float OfsX = sinf(Angle) * Len;
float OfsZ = cosf(Angle) * Len;
m_DefPoints[0].Set (a_OriginX - OfsX, a_OriginZ - OfsZ, 1, a_CeilingHeightEdge1, a_FloorHeightEdge1);
m_DefPoints[Half].Set(static_cast<float>(a_OriginX), static_cast<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;
}
};
using sRavineDefPoints = std::vector<sRavineDefPoint>;
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(size_t a_Idx1, size_t 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(static_cast<int>(MidX), static_cast<int>(MidZ)) / 11) % 2 == 0)
{
MidX += dz * m_Roughness;
MidZ -= dx * m_Roughness;
}
else
{
MidX -= dz * m_Roughness;
MidZ += dx * m_Roughness;
}
size_t 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 = static_cast<float>(rnd % 256) / 128.0f - 1.0f; // 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++)
{
#ifndef NDEBUG
// DEBUG: Make the roughravine shapepoints visible on a single layer (so that we can see with Minutor what's going on)
if ((FloorC(DifX + x) == 0) && (FloorC(DifZ + z) == 0))
{
a_ChunkDesc.SetBlockType(x, 4, z, E_BLOCK_LAPIS_ORE);
}
#endif // !NDEBUG
// 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(CeilC(itr->m_Top), +cChunkDef::Height);
for (int y = std::max(FloorC(itr->m_Bottom), 1); y <= Top; y++)
{
if ((itr->m_Radius + m_PerHeightRadius[y]) * (itr->m_Radius + m_PerHeightRadius[y]) < DistSq)
{
continue;
}
if (cBlockInfo::CanBeTerraformed(a_ChunkDesc.GetBlockType(x, y, z)))
{
a_ChunkDesc.SetBlockType(x, y, z, E_BLOCK_AIR);
}
} // 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_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:
size_t Size = static_cast<size_t>(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
));
}
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