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Performance and accuracy improvements for getSpawn.

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This commit is contained in:
Cubitect 2020-11-22 21:15:22 +01:00
parent d179ba8759
commit 13c9e34f89
1 changed files with 64 additions and 25 deletions
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87
finders.c
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@ -955,9 +955,11 @@ static double getGrassProbability(int64_t seed, int biome, int x, int z)
case mountains: return 0.8; // height dependent
case forest: return 1.0;
case taiga: return 1.0;
case swamp: return 0.6; // height dependent
case river: return 0.5;
case beach: return 0.1;
case swamp: return 0.3; // height dependent
case river: return 0.15;
case beach: return 0.0;
case snowy_tundra: return 0.02;
case snowy_mountains: return 0.02;
case wooded_hills: return 1.0;
case taiga_hills: return 1.0;
case mountain_edge: return 1.0; // height dependent
@ -967,15 +969,15 @@ static double getGrassProbability(int64_t seed, int biome, int x, int z)
case birch_forest: return 1.0;
case birch_forest_hills: return 1.0;
case dark_forest: return 0.9;
case snowy_taiga: return 0.2; // below trees
case snowy_taiga_hills: return 0.2; // below trees
case snowy_taiga: return 0.1; // below trees
case snowy_taiga_hills: return 0.1; // below trees
case giant_tree_taiga: return 0.6;
case giant_tree_taiga_hills: return 0.6;
case wooded_mountains: return 0.2; // height dependent
case savanna: return 1.0;
case savanna_plateau: return 1.0;
case wooded_badlands_plateau: return 0.1; // height dependent
case badlands_plateau: return 0.1; // height dependent
case savanna_plateau: return 0.9;
case wooded_badlands_plateau: return 0.0; // height dependent
case badlands_plateau: return 0.0; // height dependent
case sunflower_plains: return 1.0;
case gravelly_mountains: return 0.2;
@ -987,7 +989,7 @@ static double getGrassProbability(int64_t seed, int biome, int x, int z)
case tall_birch_forest: return 1.0;
case tall_birch_hills: return 1.0;
case dark_forest_hills: return 0.9;
case snowy_taiga_mountains: return 0.2;
case snowy_taiga_mountains: return 0.1;
case giant_spruce_taiga: return 0.6;
case giant_spruce_taiga_hills: return 0.6;
case modified_gravelly_mountains: return 0.2;
@ -1001,13 +1003,6 @@ static double getGrassProbability(int64_t seed, int biome, int x, int z)
}
}
static int canCoordinateBeSpawn(const int64_t seed, const LayerStack *g, int *cache, Pos pos)
{
(void) cache;
int biome = getBiomeAtPos(g, pos);
return getGrassProbability(seed, biome, pos.x, pos.z) >= 0.5;
}
static const char* getValidSpawnBiomes()
{
@ -1042,9 +1037,14 @@ Pos getSpawn(const int mcversion, const LayerStack *g, int *cache, int64_t world
spawn.x = spawn.z = 8;
}
double accum = 1;
double bx = 0;
double bz = 0;
double bn = 0;
if (mcversion >= MC_1_13)
{
// TODO: The 1.13 section may need further checking!
int *area = allocCache(g->entry_1, 16, 16);
int n2 = 0;
int n3 = 0;
int n4 = 0;
@ -1056,16 +1056,32 @@ Pos getSpawn(const int mcversion, const LayerStack *g, int *cache, int64_t world
{
int cx = ((spawn.x >> 4) + n2) << 4;
int cz = ((spawn.z >> 4) + n3) << 4;
int i2, i3;
int x, z;
for (i2 = cx; i2 <= cx+15; i2++)
genArea(g->entry_1, area, cx, cz, 16, 16);
for (x = 0; x < 16; x++)
{
for (i3 = cz; i3 <= cz+15; i3++)
for (z = 0; z < 16; z++)
{
Pos pos = {i2, i3};
if (canCoordinateBeSpawn(worldSeed, g, cache, pos))
Pos pos = {cx+x, cz+z};
int biome = area[z*16 + x];
double gp = getGrassProbability(worldSeed, biome,
pos.x, pos.z);
if (gp == 0)
continue;
bx += accum * gp * pos.x;
bz += accum * gp * pos.z;
bn += accum * gp;
accum *= 1 - gp;
if (accum < 0.001)
{
return pos;
free(area);
spawn.x = (int) round(bx / bn);
spawn.z = (int) round(bz / bn);
return spawn;
}
}
}
@ -1080,11 +1096,28 @@ Pos getSpawn(const int mcversion, const LayerStack *g, int *cache, int64_t world
n2 += n4;
n3 += n5;
}
free(area);
}
else
{
for (i = 0; i < 1000 && !canCoordinateBeSpawn(worldSeed, g, cache, spawn); i++)
for (i = 0; i < 1000; i++)
{
int biome = getBiomeAtPos(g, spawn);
double gp = getGrassProbability(worldSeed, biome, spawn.x, spawn.z);
bx += accum * gp * spawn.x;
bz += accum * gp * spawn.z;
bn += accum * gp;
accum *= 1 - gp;
if (accum < 0.001)
{
spawn.x = (int) round(bx / bn);
spawn.z = (int) round(bz / bn);
break;
}
spawn.x += nextInt(&worldSeed, 64) - nextInt(&worldSeed, 64);
spawn.z += nextInt(&worldSeed, 64) - nextInt(&worldSeed, 64);
}
@ -1111,6 +1144,12 @@ Pos estimateSpawn(const int mcversion, const LayerStack *g, int *cache, int64_t
spawn.x = spawn.z = 8;
}
if (mcversion >= MC_1_13)
{
spawn.x = (spawn.x >> 4) << 4;
spawn.z = (spawn.z >> 4) << 4;
}
return spawn;
}