Simple math function drawer in glsl shader fragment

awesome.frag

#define drawFunctionRGB(function, r, g, b) if(distance(position.y, (1. + function(position.x*10.))/2.) < 0.01) color = vec3(r, g, b)
#define drawFunctionRGB_shifted(function, shift, r, g, b) if(distance(position.y, (1. + function(position.x*10. + shift))/2.) < 0.01) color = vec3(r, g, b)

// use wisely

example.frag

precision mediump float;

uniform float time;
uniform vec2 mouse;
uniform vec2 resolution;

#define drawFunctionRGB(function, r, g, b) if(distance(position.y, (1. + function(position.x*10.))/2.) < 0.01) color = vec3(r, g, b)

float myFunction(float x) {
	return sin(x*sin(time));
}

void main() {
	vec2 position = ( gl_FragCoord.xy / resolution.xy );
	vec3 color;
	drawFunctionRGB(myFunction, 1, 1, 0);
	gl_FragColor = vec4( color, 1.0 );

}