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Improved performance of AddIsland layer.

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This commit is contained in:
Cubitect 2018-07-11 15:36:48 +01:00
parent ab70baa1e9
commit 6c874d87c4
1 changed files with 47 additions and 7 deletions
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54
layers.c
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@ -415,17 +415,57 @@ void mapAddIsland(Layer *l, int * __restrict out, int areaX, int areaZ, int area
if(v11 == 0 && (v00 != 0 || v20 != 0 || v02 != 0 || v22 != 0))
{
setChunkSeed(l, (int64_t)(x + areaX), (int64_t)(z + areaZ));
const int64_t chunkX = (int64_t)(x + areaX);
const int64_t chunkZ = (int64_t)(z + areaZ);
register int64_t cs = ss;
cs += chunkX;
cs *= cs * 6364136223846793005LL + 1442695040888963407LL;
cs += chunkZ;
cs *= cs * 6364136223846793005LL + 1442695040888963407LL;
cs += chunkX;
cs *= cs * 6364136223846793005LL + 1442695040888963407LL;
cs += chunkZ;
int v = 1;
int inc = 1;
int inc = 0;
if(v00 != 0 && mcNextInt(l, inc++) == 0) v = v00;
if(v20 != 0 && mcNextInt(l, inc++) == 0) v = v20;
if(v02 != 0 && mcNextInt(l, inc++) == 0) v = v02;
if(v22 != 0 && mcNextInt(l, inc++) == 0) v = v22;
if(v00 != 0)
{
++inc; v = v00;
cs *= cs * 6364136223846793005LL + 1442695040888963407LL;
cs += ws;
}
if(v20 != 0)
{
if(++inc == 1 || (cs & (1LL << 24)) == 0) v = v20;
cs *= cs * 6364136223846793005LL + 1442695040888963407LL;
cs += ws;
}
if(v02 != 0)
{
switch(++inc)
{
case 1: v = v02; break;
case 2: if((cs & (1LL << 24)) == 0) v = v02; break;
default: if(((cs >> 24) % 3) == 0) v = v02;
}
cs *= cs * 6364136223846793005LL + 1442695040888963407LL;
cs += ws;
}
if(v22 != 0)
{
switch(++inc)
{
case 1: v = v22; break;
case 2: if((cs & (1LL << 24)) == 0) v = v22; break;
case 3: if(((cs >> 24) % 3) == 0) v = v22; break;
default: if((cs & (3LL << 24)) == 0) v = v22;
}
cs *= cs * 6364136223846793005LL + 1442695040888963407LL;
cs += ws;
}
if(mcNextInt(l, 3) == 0)
if((cs >> 24) % 3 == 0)
out[x + z*areaWidth] = v;
else if(v == 4)
out[x + z*areaWidth] = 4;