ProjectArcade

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void main()
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{
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	//variables
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	float internalresolution = 1278.0;
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	float4 c0 = Sample();
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	//blur
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	float4 blurtotal = float4(0.0, 0.0, 0.0, 0.0);
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	float blursize = 1.5;
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	blurtotal += SampleLocation(GetCoordinates() + float2(-blursize, -blursize) * GetInvResolution());
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	blurtotal += SampleLocation(GetCoordinates() + float2(-blursize, blursize) * GetInvResolution());
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	blurtotal += SampleLocation(GetCoordinates() + float2( blursize, -blursize) * GetInvResolution());
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	blurtotal += SampleLocation(GetCoordinates() + float2( blursize, blursize) * GetInvResolution());
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	blurtotal += SampleLocation(GetCoordinates() + float2(-blursize, 0.0) * GetInvResolution());
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	blurtotal += SampleLocation(GetCoordinates() + float2( blursize, 0.0) * GetInvResolution());
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	blurtotal += SampleLocation(GetCoordinates() + float2( 0.0, -blursize) * GetInvResolution());
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	blurtotal += SampleLocation(GetCoordinates() + float2( 0.0, blursize) * GetInvResolution());
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	blurtotal *= 0.125;
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	c0 = blurtotal;
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	//greyscale
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	float grey = ((0.3 * c0.r) + (0.4 * c0.g) + (0.3 * c0.b));
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	// brighten
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	grey = grey * 0.5 + 0.7;
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	// darken edges
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	float x = GetCoordinates().x * GetResolution().x;
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	float y = GetCoordinates().y * GetResolution().y;
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	if (x > internalresolution/2.0)
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		x = internalresolution-x;
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	if (y > internalresolution/2.0)
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		y = internalresolution-y;
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	if (x > internalresolution/2.0*0.95)
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		x = internalresolution/2.0*0.95;
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	if (y > internalresolution/2.0*0.95)
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		y = internalresolution/2.0*0.95;
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	x = -x+641.0;
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	y = -y+641.0;
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	/*****inline square root routines*****/
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	// bit of a performance bottleneck.
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	// neccessary to make the darkened area rounded
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	// instead of rhombus-shaped.
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	float sqrt = x / 10.0;
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	while ((sqrt*sqrt) < x)
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		sqrt+=0.1;
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	x = sqrt;
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	sqrt = y / 10.0;
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	while ((sqrt*sqrt) < y)
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		sqrt+=0.1;
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	y = sqrt;
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	x *= 2.0;
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	y *= 2.0;
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	grey -= x / 200.0;
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	grey -= y / 200.0;
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	// output
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	SetOutput(float4(0.0, grey, 0.0, 1.0));
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}
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