dolphin/Data/Sys/Shaders/16bit.glsl

void main()
{
	//Change this number to increase the pixel size.
	float pixelSize = 3.0;

	float red	= 0.0;
	float green	= 0.0;
	float blue	= 0.0;

	float2 pos = floor(GetCoordinates() * GetResolution() / pixelSize) * pixelSize * GetInvResolution();

	float4 c0 = SampleLocation(pos);

	if (c0.r < 0.1)
		red = 0.1;
	else if (c0.r < 0.20)
		red = 0.20;
	else if (c0.r < 0.40)
		red = 0.40;
	else if (c0.r < 0.60)
		red = 0.60;
	else if (c0.r < 0.80)
		red = 0.80;
	else
		red = 1.0;

	if (c0.b < 0.1)
		blue = 0.1;
	else if (c0.b < 0.20)
		blue = 0.20;
	else if (c0.b < 0.40)
		blue = 0.40;
	else if (c0.b < 0.60)
		blue = 0.60;
	else if (c0.b < 0.80)
		blue = 0.80;
	else
		blue = 1.0;

	if (c0.g < 0.1)
		green = 0.1;
	else if (c0.g < 0.20)
		green = 0.20;
	else if (c0.g < 0.40)
		green = 0.40;
	else if (c0.g < 0.60)
		green = 0.60;
	else if (c0.g < 0.80)
		green = 0.80;
	else
		green = 1.0;

	SetOutput(float4(red, green, blue, c0.a));
}