// Each #kernel tells which function to compile; you can have many kernels
#pragma kernel CSMain


RWTexture2D<float4> _Result;
Texture2D<float4> _Positions;

uint _Result_Width;
uint _Result_Height;

#pragma multi_compile_local __ _R8

[numthreads(512,1,1)]
void CSMain (uint3 id : SV_DispatchThreadID)
{
    float4 pos = _Positions.Load(int3(id.xy,0));

    if (pos.w > 0)
    {
        uint2 px = uint2((uint)round(pos.x * _Result_Width), (uint)round(pos.z * _Result_Height));
        #if _R8
            _Result[px.xy] = float4(1,1,1,1);
        #else
            _Result[px.xy] = float4(_Result[px.xy].xy, 1, 1);
        #endif
    }
}