// Each #kernel tells which function to compile; you can have many kernels
#pragma kernel Noise
#include "Noises/SimplexNoise.compute"


RWStructuredBuffer<float4> points;
int numPointsPerAxis;

int octaves;
float frequency;
float persistence;
float amplitude;
float4 offset;

int indexFromCoord(int x, int y, int z) {
    return z * numPointsPerAxis * numPointsPerAxis + y * numPointsPerAxis + x;
}
[numthreads(8,8,8)]
void Noise (int3 id : SV_DispatchThreadID)
{
    if (id.x >= numPointsPerAxis || id.y >= numPointsPerAxis || id.z >= numPointsPerAxis) {
        return;
    }

    float maxAmp = 0;
    float noise = 0;

    for(int i = 0; i < octaves; i++)
    {
        float3 new_id = (id + offset.xyz)* frequency;
        noise += snoise(new_id) * amplitude;
        maxAmp += amplitude;
        amplitude *= persistence;
        frequency *= 2;
    }
    noise /= maxAmp;

    
    int index = indexFromCoord(id.x,id.y,id.z);
    points[index] = float4(id, noise);
}