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

// Create a RenderTexture with enableRandomWrite flag and set it
// with cs.SetTexture
RWTexture2D<float4> result;

// Input texture
Texture2D<float4> source_texture;

[numthreads(8,8,1)]
void cs_main (uint3 id : SV_DispatchThreadID)
{
    float4 color = result[id.xy];
    color.rgb = 1 - color.rgb; // invert the color
    result[id.xy] = color;
}