forked from Mirrorlandia_minetest/minetest
Use binary operators rather than "Python modulo" in decoding block positions
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@ -20,33 +20,29 @@ with this program; if not, write to the Free Software Foundation, Inc.,
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#include "database.h"
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#include "irrlichttypes.h"
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static s32 unsignedToSigned(s32 i, s32 max_positive)
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static inline s16 unsigned_to_signed(u16 i, u16 max_positive)
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{
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if(i < max_positive)
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if (i < max_positive) {
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return i;
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else
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return i - 2*max_positive;
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} else {
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return i - (max_positive * 2);
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}
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}
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// modulo of a negative number does not work consistently in C
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static s64 pythonmodulo(s64 i, s64 mod)
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s64 Database::getBlockAsInteger(const v3s16 pos) const
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{
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if(i >= 0)
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return i % mod;
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return mod - ((-i) % mod);
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}
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s64 Database::getBlockAsInteger(const v3s16 pos) {
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return (u64) pos.Z * 16777216 +
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(u64) pos.Y * 4096 +
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return (u64) pos.Z * 0x1000000 +
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(u64) pos.Y * 0x1000 +
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(u64) pos.X;
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}
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v3s16 Database::getIntegerAsBlock(s64 i) {
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s32 x = unsignedToSigned(pythonmodulo(i, 4096), 2048);
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i = (i - x) / 4096;
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s32 y = unsignedToSigned(pythonmodulo(i, 4096), 2048);
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i = (i - y) / 4096;
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s32 z = unsignedToSigned(pythonmodulo(i, 4096), 2048);
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return v3s16(x,y,z);
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v3s16 Database::getIntegerAsBlock(const s64 i) const
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{
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v3s16 pos;
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pos.Z = unsigned_to_signed((i >> 24) & 0xFFF, 0x1000 / 2);
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pos.Y = unsigned_to_signed((i >> 12) & 0xFFF, 0x1000 / 2);
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pos.X = unsigned_to_signed((i ) & 0xFFF, 0x1000 / 2);
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return pos;
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}
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@ -34,8 +34,8 @@ public:
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virtual void saveBlock(MapBlock *block)=0;
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virtual MapBlock* loadBlock(v3s16 blockpos)=0;
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s64 getBlockAsInteger(const v3s16 pos);
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v3s16 getIntegerAsBlock(s64 i);
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s64 getBlockAsInteger(const v3s16 pos) const;
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v3s16 getIntegerAsBlock(const s64 i) const;
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virtual void listAllLoadableBlocks(std::list<v3s16> &dst)=0;
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virtual int Initialized(void)=0;
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virtual ~Database() {};
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