falloutBot/go-mc
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Simplified bit operation

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This commit is contained in:
Tnze
2020-05-24 12:40:01 +08:00
parent cfd8d6b870
commit dade32116f
1 changed files with 3 additions and 3 deletions
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6
bot/world/chunk.go
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@ -5,7 +5,6 @@ import (
"fmt" "fmt"
"github.com/Tnze/go-mc/data" "github.com/Tnze/go-mc/data"
pk "github.com/Tnze/go-mc/net/packet" pk "github.com/Tnze/go-mc/net/packet"
"math"
) )
// DecodeChunkColumn decode the chunk data structure. // DecodeChunkColumn decode the chunk data structure.
@ -117,11 +116,12 @@ func (d *directSection) GetBlock(offset int) BlockStatus {
func (d *directSection) SetBlock(offset int, s BlockStatus) { func (d *directSection) SetBlock(offset int, s BlockStatus) {
offset *= d.bpb offset *= d.bpb
padding := offset % 64 padding := offset % 64
mask := uint64(math.MaxUint64<<(padding+d.bpb) | (1<<padding - 1)) mask := ^uint64((1<<d.bpb - 1) << padding)
d.data[offset/64] = d.data[offset/64]&mask | uint64(s)<<padding d.data[offset/64] = d.data[offset/64]&mask | uint64(s)<<padding
if padding > 64-d.bpb { if padding > 64-d.bpb {
l := padding - (64 - d.bpb) l := padding - (64 - d.bpb)
d.data[offset/64+1] = d.data[offset/64+1]&(math.MaxUint64<<l) | uint64(s)>>(64-padding) const maxUint64 = 1<<64 - 1
d.data[offset/64+1] = d.data[offset/64+1]&(maxUint64<<l) | uint64(s)>>(64-padding)
} }
} }