// simple scope overlay + bokeh blur

#define PI 3.14159265

void main()
{
	vec2 uv = TexCoord.st;
	vec3 base = texture(InputTexture,uv).rgb;
	vec2 bof = 1./vec2(textureSize(InputTexture,0));
	float rsamples, tstep = 1.;
	vec2 bstr = bof*4.;
	float bstep;
	vec2 rcoord;
	for ( float i=1.; i<=5.; i+=1. )
	{
		rsamples = i*3.;
		for ( float j=0.; j<rsamples; j+=1. )
		{
			bstep = PI*2./rsamples;
			rcoord = vec2(cos(j*bstep),sin(j*bstep))*i;
			tstep++;
			base.rgb += texture(InputTexture,uv+rcoord*bstr).rgb;
		}
	}
	base /= tstep;
	vec2 p = vec2(.5)-uv;
	vec2 sz = vec2(textureSize(InputTexture,0));
	if ( sz.x > sz.y ) p.x *= sz.x/sz.y;
	else p.y *= sz.y/sz.x;
	vec3 col = texture(InputTexture,uv+p*pow(length(p),8.)*20.).rgb;
	col = (col+.02)*.98*vec3(1.2,.6,.15);
	float fade = 1.-clamp(pow(length(p)*2.,40.),0.,1.);
	FragColor = vec4(mix(base*.05,col,vec3(fade)),1.);
}