minecraft-source/src/net/minecraft/world/level/BlockGetter.java

package net.minecraft.world.level;

import net.minecraft.util.Mth;
import java.util.function.Function;
import java.util.function.BiFunction;
import net.minecraft.world.phys.shapes.VoxelShape;
import net.minecraft.world.phys.Vec3;
import net.minecraft.core.Direction;
import net.minecraft.world.phys.BlockHitResult;
import net.minecraft.world.level.material.FluidState;
import net.minecraft.world.level.block.state.BlockState;
import javax.annotation.Nullable;
import net.minecraft.world.level.block.entity.BlockEntity;
import net.minecraft.core.BlockPos;

public interface BlockGetter {
    @Nullable
    BlockEntity getBlockEntity(final BlockPos fk);
    
    BlockState getBlockState(final BlockPos fk);
    
    FluidState getFluidState(final BlockPos fk);
    
    default int getLightEmission(final BlockPos fk) {
        return this.getBlockState(fk).getLightEmission();
    }
    
    default int getMaxLightLevel() {
        return 15;
    }
    
    default int getMaxBuildHeight() {
        return 256;
    }
    
    default BlockHitResult clip(final ClipContext bjg) {
        final BlockState byg4;
        final FluidState cog5;
        final Vec3 cvi6;
        final Vec3 cvi7;
        final VoxelShape cwc8;
        final BlockHitResult cvd9;
        final VoxelShape cwc9;
        final BlockHitResult cvd10;
        final double double12;
        final double double13;
        final Vec3 cvi8;
        return BlockGetter.<BlockHitResult>traverseBlocks(bjg, (bjg, fk) -> {
            byg4 = this.getBlockState(fk);
            cog5 = this.getFluidState(fk);
            cvi6 = bjg.getFrom();
            cvi7 = bjg.getTo();
            cwc8 = bjg.getBlockShape(byg4, this, fk);
            cvd9 = this.clipWithInteractionOverride(cvi6, cvi7, fk, cwc8, byg4);
            cwc9 = bjg.getFluidShape(cog5, this, fk);
            cvd10 = cwc9.clip(cvi6, cvi7, fk);
            double12 = ((cvd9 == null) ? Double.MAX_VALUE : bjg.getFrom().distanceToSqr(cvd9.getLocation()));
            double13 = ((cvd10 == null) ? Double.MAX_VALUE : bjg.getFrom().distanceToSqr(cvd10.getLocation()));
            return (double12 <= double13) ? cvd9 : cvd10;
        }, bjg -> {
            cvi8 = bjg.getFrom().subtract(bjg.getTo());
            return BlockHitResult.miss(bjg.getTo(), Direction.getNearest(cvi8.x, cvi8.y, cvi8.z), new BlockPos(bjg.getTo()));
        });
    }
    
    @Nullable
    default BlockHitResult clipWithInteractionOverride(final Vec3 cvi1, final Vec3 cvi2, final BlockPos fk, final VoxelShape cwc, final BlockState byg) {
        final BlockHitResult cvd7 = cwc.clip(cvi1, cvi2, fk);
        if (cvd7 != null) {
            final BlockHitResult cvd8 = byg.getInteractionShape(this, fk).clip(cvi1, cvi2, fk);
            if (cvd8 != null && cvd8.getLocation().subtract(cvi1).lengthSqr() < cvd7.getLocation().subtract(cvi1).lengthSqr()) {
                return cvd7.withDirection(cvd8.getDirection());
            }
        }
        return cvd7;
    }
    
    default <T> T traverseBlocks(final ClipContext bjg, final BiFunction<ClipContext, BlockPos, T> biFunction, final Function<ClipContext, T> function) {
        final Vec3 cvi4 = bjg.getFrom();
        final Vec3 cvi5 = bjg.getTo();
        if (cvi4.equals(cvi5)) {
            return function.apply(bjg);
        }
        final double double6 = Mth.lerp(-1.0E-7, cvi5.x, cvi4.x);
        final double double7 = Mth.lerp(-1.0E-7, cvi5.y, cvi4.y);
        final double double8 = Mth.lerp(-1.0E-7, cvi5.z, cvi4.z);
        final double double9 = Mth.lerp(-1.0E-7, cvi4.x, cvi5.x);
        final double double10 = Mth.lerp(-1.0E-7, cvi4.y, cvi5.y);
        final double double11 = Mth.lerp(-1.0E-7, cvi4.z, cvi5.z);
        int integer18 = Mth.floor(double9);
        int integer19 = Mth.floor(double10);
        int integer20 = Mth.floor(double11);
        final BlockPos.MutableBlockPos a21 = new BlockPos.MutableBlockPos(integer18, integer19, integer20);
        final T object22 = biFunction.apply(bjg, a21);
        if (object22 != null) {
            return object22;
        }
        final double double12 = double6 - double9;
        final double double13 = double7 - double10;
        final double double14 = double8 - double11;
        final int integer21 = Mth.sign(double12);
        final int integer22 = Mth.sign(double13);
        final int integer23 = Mth.sign(double14);
        final double double15 = (integer21 == 0) ? Double.MAX_VALUE : (integer21 / double12);
        final double double16 = (integer22 == 0) ? Double.MAX_VALUE : (integer22 / double13);
        final double double17 = (integer23 == 0) ? Double.MAX_VALUE : (integer23 / double14);
        double double18 = double15 * ((integer21 > 0) ? (1.0 - Mth.frac(double9)) : Mth.frac(double9));
        double double19 = double16 * ((integer22 > 0) ? (1.0 - Mth.frac(double10)) : Mth.frac(double10));
        double double20 = double17 * ((integer23 > 0) ? (1.0 - Mth.frac(double11)) : Mth.frac(double11));
        while (double18 <= 1.0 || double19 <= 1.0 || double20 <= 1.0) {
            if (double18 < double19) {
                if (double18 < double20) {
                    integer18 += integer21;
                    double18 += double15;
                }
                else {
                    integer20 += integer23;
                    double20 += double17;
                }
            }
            else if (double19 < double20) {
                integer19 += integer22;
                double19 += double16;
            }
            else {
                integer20 += integer23;
                double20 += double17;
            }
            final T object23 = biFunction.apply(bjg, a21.set(integer18, integer19, integer20));
            if (object23 != null) {
                return object23;
            }
        }
        return function.apply(bjg);
    }
}