4jcraft/Minecraft.World/WorldGen/Layers/BiomeOverrideLayer.cpp

#include "../../Platform/stdafx.h"
#include "../../Headers/net.minecraft.world.level.biome.h"
#include "../../Headers/net.minecraft.world.level.newbiome.layer.h"
#include "../../Headers/net.minecraft.world.level.h"
#include "BiomeOverrideLayer.h"

BiomeOverrideLayer::BiomeOverrideLayer(int seedMixup) : Layer(seedMixup) {
    m_biomeOverride = byteArray(width * height);

#if defined(_UNICODE)
    std::wstring path = L"GAME:\\GameRules\\biomemap.bin";
    HANDLE file = CreateFile(path.c_str(), GENERIC_READ, 0, nullptr, OPEN_EXISTING,
                             FILE_ATTRIBUTE_NORMAL, nullptr);
#else
#if defined(_WINDOWS64)
    std::string path = "GameRules\\biomemap.bin";
#else
    std::string path = "GAME:\\GameRules\\biomemap.bin";
#endif
    HANDLE file = CreateFile(path.c_str(), GENERIC_READ, 0, nullptr, OPEN_EXISTING,
                             FILE_ATTRIBUTE_NORMAL, nullptr);
#endif
    if (file == INVALID_HANDLE_VALUE) {
        DWORD error = GetLastError();
        // assert(false);
        app.DebugPrintf("Biome override not found, using plains as default\n");

        memset(m_biomeOverride.data, Biome::plains->id, m_biomeOverride.length);
    } else {
        DWORD bytesRead, dwFileSize = GetFileSize(file, nullptr);
        if (dwFileSize > m_biomeOverride.length) {
            app.DebugPrintf("Biomemap binary is too large!!\n");
            __debugbreak();
        }
        bool bSuccess =
            ReadFile(file, m_biomeOverride.data, dwFileSize, &bytesRead, nullptr);

        if (bSuccess == FALSE) {
            app.FatalLoadError();
        }

        CloseHandle(file);
    }
}

intArray BiomeOverrideLayer::getArea(int xo, int yo, int w, int h) {
    intArray result{static_cast<unsigned int>(w * h)};

    int xOrigin = xo + width / 2;
    int yOrigin = yo + height / 2;
    if (xOrigin < 0) xOrigin = 0;
    if (xOrigin >= width) xOrigin = width - 1;
    if (yOrigin < 0) yOrigin = 0;
    if (yOrigin >= height) yOrigin = height - 1;
    for (int y = 0; y < h; y++) {
        for (int x = 0; x < w; x++) {
            int curX = xOrigin + x;
            int curY = yOrigin + y;
            if (curX >= width) curX = width - 1;
            if (curY >= height) curY = height - 1;
            int index = curX + curY * width;

            unsigned char headerValue = m_biomeOverride[index];
            result[x + y * w] = headerValue;
        }
    }
    return result;
}