#pragma kernel CSMain

RWStructuredBuffer<float4x4> matrices;

int _CountX;
int _CountZ;
float _SizeX;
float _SizeZ;
float _Height;

[numthreads(64, 1, 1)]
void CSMain(uint3 id : SV_DispatchThreadID)
{
    uint idx = id.x;
    uint total = _CountX * _CountZ;
    if (idx >= total)
        return;

    uint ix = idx % _CountX;
    uint iz = idx / _CountX;

    float fx = ((float) ix / (_CountX - 1)) * _SizeX - (_SizeX * 0.5);
    float fz = ((float) iz / (_CountZ - 1)) * _SizeZ - (_SizeZ * 0.5);
    float fy = _Height;

    float4x4 m = float4x4(
        1, 0, 0, 0,
        0, 1, 0, 0,
        0, 0, 1, 0,
        fx, fy, fz, 1
    );

    matrices[idx] = m;
}