EndGen.cpp

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// EndGen.cpp

// Implements the cEndGen class representing the generator for the End, both as a HeightGen and CompositionGen

#include "Globals.h"
#include "EndGen.h"
#include "../IniFile.h"
#include "../LinearUpscale.h"





enum
{
    // Interpolation cell size:
    INTERPOL_X = 4,
    INTERPOL_Y = 4,
    INTERPOL_Z = 4,

    // Size of chunk data, downscaled before interpolation:
    DIM_X = 16  / INTERPOL_X + 1,
    DIM_Y = 256 / INTERPOL_Y + 1,
    DIM_Z = 16  / INTERPOL_Z + 1,
} ;





// cEndGen:

cEndGen::cEndGen(int a_Seed) :
    m_Seed(a_Seed),
    m_IslandSizeX(256),
    m_IslandSizeY(96),
    m_IslandSizeZ(256),
    m_FrequencyX(80),
    m_FrequencyY(80),
    m_FrequencyZ(80),
    m_MinChunkX(0),
    m_MaxChunkX(0),
    m_MinChunkZ(0),
    m_MaxChunkZ(0),
    m_LastChunkCoords(0x7fffffff, 0x7fffffff)  // Use dummy coords that won't ever be used by real chunks
{
    m_Perlin.AddOctave(1, 1);
    m_Perlin.AddOctave(2, 0.5);
    m_Perlin.AddOctave(4, 0.25);
}





void cEndGen::InitializeCompoGen(cIniFile & a_IniFile)
{
    m_IslandSizeX = a_IniFile.GetValueSetI("Generator", "EndGenIslandSizeX", m_IslandSizeX);
    m_IslandSizeY = a_IniFile.GetValueSetI("Generator", "EndGenIslandSizeY", m_IslandSizeY);
    m_IslandSizeZ = a_IniFile.GetValueSetI("Generator", "EndGenIslandSizeZ", m_IslandSizeZ);

    m_FrequencyX = static_cast<NOISE_DATATYPE>(a_IniFile.GetValueSetF("Generator", "EndGenFrequencyX", m_FrequencyX));
    m_FrequencyY = static_cast<NOISE_DATATYPE>(a_IniFile.GetValueSetF("Generator", "EndGenFrequencyY", m_FrequencyY));
    m_FrequencyZ = static_cast<NOISE_DATATYPE>(a_IniFile.GetValueSetF("Generator", "EndGenFrequencyZ", m_FrequencyZ));

    // Recalculate the min and max chunk coords of the island
    m_MaxChunkX = (m_IslandSizeX + cChunkDef::Width - 1) / cChunkDef::Width;
    m_MinChunkX = -m_MaxChunkX;
    m_MaxChunkZ = (m_IslandSizeZ + cChunkDef::Width - 1) / cChunkDef::Width;
    m_MinChunkZ = -m_MaxChunkZ;
}





void cEndGen::PrepareState(cChunkCoords a_ChunkCoords)
{
    ASSERT(!IsChunkOutsideRange(a_ChunkCoords));  // Should be filtered before calling this function

    if (m_LastChunkCoords == a_ChunkCoords)
    {
        return;
    }

    m_LastChunkCoords = a_ChunkCoords;

    GenerateNoiseArray();
}





void cEndGen::GenerateNoiseArray(void)
{
    NOISE_DATATYPE NoiseData[DIM_X * DIM_Y * DIM_Z];  // [x + DIM_X * z + DIM_X * DIM_Z * y]
    NOISE_DATATYPE Workspace[DIM_X * DIM_Y * DIM_Z];  // [x + DIM_X * z + DIM_X * DIM_Z * y]

    // Generate the downscaled noise:
    NOISE_DATATYPE StartX = static_cast<NOISE_DATATYPE>(m_LastChunkCoords.m_ChunkX       * cChunkDef::Width) / m_FrequencyX;
    NOISE_DATATYPE EndX   = static_cast<NOISE_DATATYPE>((m_LastChunkCoords.m_ChunkX + 1) * cChunkDef::Width) / m_FrequencyX;
    NOISE_DATATYPE StartZ = static_cast<NOISE_DATATYPE>(m_LastChunkCoords.m_ChunkZ       * cChunkDef::Width) / m_FrequencyZ;
    NOISE_DATATYPE EndZ   = static_cast<NOISE_DATATYPE>((m_LastChunkCoords.m_ChunkZ + 1) * cChunkDef::Width) / m_FrequencyZ;
    NOISE_DATATYPE StartY = 0;
    NOISE_DATATYPE EndY   = static_cast<NOISE_DATATYPE>(257) / m_FrequencyY;
    m_Perlin.Generate3D(NoiseData, DIM_X, DIM_Z, DIM_Y, StartX, EndX, StartZ, EndZ, StartY, EndY, Workspace);

    // Add distance:
    int idx = 0;
    for (int y = 0; y < DIM_Y; y++)
    {
        NOISE_DATATYPE ValY = static_cast<NOISE_DATATYPE>(2 * INTERPOL_Y * y - m_IslandSizeY) / m_IslandSizeY;
        ValY = ValY * ValY;
        for (int z = 0; z < DIM_Z; z++)
        {
            NOISE_DATATYPE ValZ = static_cast<NOISE_DATATYPE>(m_LastChunkCoords.m_ChunkZ * cChunkDef::Width + (z * cChunkDef::Width / (DIM_Z - 1))) / m_IslandSizeZ;
            ValZ = ValZ * ValZ;
            for (int x = 0; x < DIM_X; x++)
            {
                // NOISE_DATATYPE ValX = StartX + (EndX - StartX) * x / (DIM_X - 1);
                NOISE_DATATYPE ValX = static_cast<NOISE_DATATYPE>(m_LastChunkCoords.m_ChunkX * cChunkDef::Width + (x * cChunkDef::Width / (DIM_X - 1))) / m_IslandSizeX;
                ValX = ValX * ValX;
                NoiseData[idx++] += ValX + ValZ + ValY;
            }  // for x
        }  // for z
    }  // for y

    // Upscale into real chunk size:
    LinearUpscale3DArray(NoiseData, DIM_X, DIM_Z, DIM_Y, m_NoiseArray, INTERPOL_X, INTERPOL_Z, INTERPOL_Y);
}





bool cEndGen::IsChunkOutsideRange(cChunkCoords a_ChunkCoords)
{
    return (
        (a_ChunkCoords.m_ChunkX < m_MinChunkX) || (a_ChunkCoords.m_ChunkX > m_MaxChunkX) ||
        (a_ChunkCoords.m_ChunkZ < m_MinChunkZ) || (a_ChunkCoords.m_ChunkZ > m_MaxChunkZ)
    );
}





void cEndGen::GenShape(cChunkCoords a_ChunkCoords, cChunkDesc::Shape & a_Shape)
{
    // If the chunk is outside out range, fill the shape with zeroes:
    if (IsChunkOutsideRange(a_ChunkCoords))
    {
        for (size_t i = 0; i < ARRAYCOUNT(a_Shape); i++)
        {
            a_Shape[i] = 0;
        }
        return;
    }

    PrepareState(a_ChunkCoords);

    int MaxY = std::min(static_cast<int>(1.75 * m_IslandSizeY + 1), cChunkDef::Height - 1);
    for (int z = 0; z < cChunkDef::Width; z++)
    {
        for (int x = 0; x < cChunkDef::Width; x++)
        {
            for (int y = 0; y < MaxY; y++)
            {
                a_Shape[(x + 16 * z) * 256 + y] = (m_NoiseArray[y * 17 * 17 + z * 17 + z] > 0) ? 1 : 0;
            }
            for (int y = MaxY; y < cChunkDef::Height; y++)
            {
                a_Shape[(x + 16 * z) * 256 + y] = 0;
            }
        }  // for x
    }  // for z
}





void cEndGen::ComposeTerrain(cChunkDesc & a_ChunkDesc, const cChunkDesc::Shape & a_Shape)
{
    a_ChunkDesc.FillBlocks(E_BLOCK_AIR, 0);
    for (int z = 0; z < cChunkDef::Width; z++)
    {
        for (int x = 0; x < cChunkDef::Width; x++)
        {
            for (int y = 0; y < cChunkDef::Height; y++)
            {
                if (a_Shape[(x + 16 * z) * 256 + y] != 0)
                {
                    a_ChunkDesc.SetBlockType(x, y, z, E_BLOCK_END_STONE);
                }
            }  // for y
        }  // for x
    }  // for z
}