// 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_MaxSize, int a_GridX, int a_GridZ, int a_OriginX, int a_OriginZ) :
super(a_GridX, a_GridZ, a_OriginX, a_OriginZ),
m_Noise(a_Seed + 100),
m_MaxSize(a_MaxSize)
{
// Create the basic structure - 2 lines meeting at the centerpoint:
m_DefPoints.resize(a_MaxSize + 1);
int Half = a_MaxSize / 2; // m_DefPoints[Half] will be the centerpoint
int rnd = m_Noise.IntNoise2DInt(a_OriginX, a_OriginZ) / 7;
float Len = (float)(3 * a_MaxSize / 4 + rnd % (a_MaxSize / 4)); // Random number between 3 / 4 * a_MaxSize and a_MaxSize
rnd = rnd / a_MaxSize;
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, 42, 34);
m_DefPoints[Half].Set ((float)a_OriginX, (float)a_OriginZ, Len / 10, 62, 16);
m_DefPoints[a_MaxSize].Set(a_OriginX + OfsX, a_OriginZ + OfsZ, 1, 44, 32);
// Calculate the points in between, recursively:
SubdivideLine(0, Half);
SubdivideLine(Half, a_MaxSize);
}
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;
cNoise m_Noise;
int m_MaxSize;
sRavineDefPoints m_DefPoints;
/** 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 / 10;
MidZ -= dx / 10;
}
else
{
MidX -= dz / 10;
MidZ += dx / 10;
}
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);
}
}
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) < BlockStartX) ||
(floorf(itr->m_X - itr->m_Radius) > BlockEndX) ||
(ceilf (itr->m_Z + itr->m_Radius) < BlockStartZ) ||
(floorf(itr->m_Z - itr->m_Radius) > BlockEndZ)
)
{
// Cannot intersect, bail out early
continue;
}
// Carve out a cylinder around the xz point, m_Radius in diameter, from Bottom to Top:
float RadiusSq = itr->m_Radius * itr->m_Radius; // instead of doing sqrt for each distance, we do sqr of the radius
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
float DistSq = (DifX + x) * (DifX + x) + (DifZ + z) * (DifZ + z);
if (DistSq <= RadiusSq)
{
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++)
{
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;
}
}
}
} // for x, z - a_BlockTypes
} // for itr - m_Points[]
}
};
////////////////////////////////////////////////////////////////////////////////
// cRoughRavines:
cRoughRavines::cRoughRavines(int a_Seed, int a_MaxSize, 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)
{
if (m_MaxSize < 1)
{
m_MaxSize = 16;
LOGWARNING("RoughRavines: MaxSize too small, adjusting request from %d to %d", a_MaxSize, m_MaxSize);
}
}
cGridStructGen::cStructurePtr cRoughRavines::CreateStructure(int a_GridX, int a_GridZ, int a_OriginX, int a_OriginZ)
{
return cStructurePtr(new cRoughRavine(m_Seed, m_MaxSize, a_GridX, a_GridZ, a_OriginX, a_OriginZ));
}
