public void Generate(Vector3i origin, IGenerationStep.Parameters parameters, Span <ushort> blocks)
{
Span <int> heightmap = stackalloc int[GenerationConstants.CHUNK_SIZE_SQUARED];
int index = 0;
for (int y = 0; y < GenerationConstants.CHUNK_SIZE; y++)
{
int heightmapIndex = 0;
for (int z = 0; z < GenerationConstants.CHUNK_SIZE; z++)
{
for (int x = 0; x < GenerationConstants.CHUNK_SIZE; x++, heightmapIndex++, index++)
{
Vector3i global = origin + new Vector3i(x, y, z);
if (y == 0)
{
heightmap[heightmapIndex] = CalculateHeight(new Vector2(global.X, global.Z), parameters.Frequency, parameters.Persistence);
}
int noiseHeight = heightmap[heightmapIndex];
if ((global.Y < 4) && (global.Y <= parameters.SeededRandom.Next(0, 4)))
{
blocks[index] = BlockRegistry.Instance.GetBlockID("Core:Bedrock");
}
else if ((noiseHeight < origin.Y) || (CalculateCaveNoise(global, parameters) < parameters.CaveThreshold))
{
blocks[index] = BlockRegistry.AirID;
}
else if (global.Y == noiseHeight)
{
blocks[index] = BlockRegistry.Instance.GetBlockID("Core:Grass");
}
else if ((global.Y < noiseHeight) && (global.Y >= (noiseHeight - 3))) // lay dirt up to 3 blocks below noise height
{
blocks[index] = parameters.SeededRandom.Next(0, 8) == 0
? BlockRegistry.Instance.GetBlockID("Core:Dirt_Coarse")
: BlockRegistry.Instance.GetBlockID("Core:Dirt");
}
else if (global.Y < (noiseHeight - 3))
{
blocks[index] = BlockRegistry.Instance.GetBlockID("Core:Stone");
}
else
{
blocks[index] = BlockRegistry.AirID;
}
}
}
}
}
private static float CalculateCaveNoise(Vector3i global, IGenerationStep.Parameters parameters)
{
float currentHeight = (global.Y + (((GenerationConstants.WORLD_HEIGHT / 4f) - (global.Y * 1.25f)) * parameters.Persistence)) * 0.85f;
float heightDampener = currentHeight.Unlerp(0f, GenerationConstants.WORLD_HEIGHT);
float sampleA = OpenSimplexSlim.GetSimplex(parameters.Seed ^ 2, parameters.Frequency, global) * heightDampener;
float sampleB = OpenSimplexSlim.GetSimplex(parameters.Seed ^ 3, parameters.Frequency, global) * heightDampener;
sampleA *= sampleA;
sampleB *= sampleB;
return((sampleA + sampleB) * 0.5f);
}