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semanteme of window pixel position in shader

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Hi: if we know the window position, I want to give this pixel a different color.I heard that is a semanteme to get it.but, i can't find it.so, i compute it by manual.
varying vec4 position;
uniform float WindowWide;
uniform float WindowHeight;
void main()
	float x, y;
	x = Wide * 0.5 + position.x * ( Wide * 0.5 );
	y = Height * 0.5 + position.y * ( Height * 0.5 );
	if( x == 200 && y == 200)
		gl_FragColor = vec4(0.0, 1.0, 0.0, 0.0);
		gl_FragColor = vec4(1.0, 0.0, 0.0, 0.0);
thank you!

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semanteme == function =) funny translation though.

Anyway, you haven't actually asked a question. Does your method work?


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I hardly believe it since '==' in floating point is almost equal to NEVER. Range checking is definetly necessary here!

I would expect all pixels to be red.

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