float4 shadeVideo(ShaderContext context)
{
	float2 uv = clamp(context.uv + offset, float2(0.0, 0.0), float2(1.0, 1.0));
	float4 color = sampleVideo(uv);

	color.rgb *= brightness;
	color *= tint;

	if (invert)
		color.rgb = 1.0 - color.rgb;

	if (mode == 1)
	{
		float luma = dot(color.rgb, float3(0.2126, 0.7152, 0.0722));
		color.rgb = float3(luma, luma, luma);
	}
	else if (mode == 2)
	{
		color.rgb = floor(color.rgb * 4.0) / 4.0;
	}

	return saturate(color);
}