This is a modified version of the freely published version in the paper by
Stefan Gustavson at
http://staffwww.itn.liu.se/~stegu/simplexnoise/simplexnoise.pdf
public function generateChunk($chunkX, $chunkZ)
{
$this->random->setSeed(0xdeadbeef ^ $chunkX << 8 ^ $chunkZ ^ $this->level->getSeed());
$hills = [];
$base = [];
$incline = [];
for ($z = 0; $z < 16; ++$z) {
for ($x = 0; $x < 16; ++$x) {
$i = ($z << 4) + $x;
$hills[$i] = $this->noiseHills->noise2D($x + ($chunkX << 4), $z + ($chunkZ << 4), true);
$base[$i] = $this->noiseBase->noise2D($x + ($chunkX << 4), $z + ($chunkZ << 4), true);
if ($base[$i] < 0) {
$base[$i] *= 0.5;
}
}
}
$chunk = $this->level->getChunk($chunkX, $chunkZ);
for ($z = 0; $z < 16; ++$z) {
for ($x = 0; $x < 16; ++$x) {
$i = ($z << 4) + $x;
$height = $this->worldHeight + $hills[$i] * 14 + $base[$i] * 7;
$height = (int) $height;
for ($y = 0; $y < 128; ++$y) {
$block = $this->pickBlock($x, $y, $z, $height);
$chunk->setBlock($x, $y, $z, ...$block);
}
}
}
}
public function generateChunk($chunkX, $chunkZ)
{
$this->random->setSeed(0xdeadbeef ^ $chunkX << 8 ^ $chunkZ ^ $this->level->getSeed());
$hills = [];
$base = [];
for ($z = 0; $z < 16; ++$z) {
for ($x = 0; $x < 16; ++$x) {
$i = ($z << 4) + $x;
$hills[$i] = $this->noiseHills->noise2D($x + ($chunkX << 4), $z + ($chunkZ << 4), true);
$base[$i] = $this->noiseBase->noise2D($x + ($chunkX << 4), $z + ($chunkZ << 4), true);
if ($base[$i] < 0) {
$base[$i] *= 0.5;
}
}
}
$chunk = $this->level->getChunk($chunkX, $chunkZ);
for ($z = 0; $z < 16; ++$z) {
for ($x = 0; $x < 16; ++$x) {
$i = ($z << 4) + $x;
$height = $this->worldHeight + $hills[$i] * 14 + $base[$i] * 7;
$height = (int) $height;
for ($y = 0; $y < 128; ++$y) {
$diff = $height - $y;
if ($y <= 4 and ($y === 0 or $this->random->nextFloat() < 0.75)) {
$chunk->setBlockId($x, $y, $z, Block::BEDROCK);
} elseif ($diff > 2) {
$chunk->setBlockId($x, $y, $z, Block::STONE);
} elseif ($diff > 0) {
$chunk->setBlockId($x, $y, $z, Block::DIRT);
} elseif ($y <= $this->waterHeight) {
if ($this->waterHeight - $y <= 1 and $diff === 0) {
$chunk->setBlockId($x, $y, $z, Block::SAND);
} elseif ($diff === 0) {
$chunk->setBlockId($x, $y, $z, Block::DIRT);
} else {
$chunk->setBlockId($x, $y, $z, Block::STILL_WATER);
}
} elseif ($diff === 0) {
$chunk->setBlockId($x, $y, $z, Block::GRASS);
}
}
}
}
}
public function getRainfall($x, $z)
{
return ($this->rainfall->noise2D($x, $z, \true) + 1) / 2;
}
