float4 shadeVideo(ShaderContext context)
{
	float2 count = max(pixelCount, float2(1.0, 1.0));
	float2 cell = floor(context.uv * count);
	float2 sampledUv = (cell + 0.5) / count;
	float4 color = sampleVideo(clamp(sampledUv, 0.0, 1.0));

	float2 local = frac(context.uv * count);
	float gridLine = 1.0 - step(0.035, min(min(local.x, 1.0 - local.x), min(local.y, 1.0 - local.y)));
	color.rgb = lerp(color.rgb, gridColor.rgb, gridLine * saturate(gridAmount) * gridColor.a);
	return color;
}