struct VS_to_PS
{
    float4 position : SV_POSITION;
    float4 depthPosition : TEXTURE0;
};

float4 DepthPixelShader(VS_to_PS input) : SV_TARGET
{
    float depthValue = input.depthPosition.z / input.depthPosition.w;
    float4 color = float4(depthValue, depthValue, depthValue, 1.0f);

    return color;
}