#version 300 es
precision mediump float;

in vec2 vertTexCoord;
in vec4 vertColor;

uniform sampler2D sdfTexture;
uniform float threshold;
uniform float smoothRange;

out vec4 fragColor;

void main() {
	float smoothMin = threshold - smoothRange * 0.5;
	float smoothMax = smoothMin + smoothRange;
	float sdfSample = smoothstep(smoothMin, smoothMax, texture(sdfTexture, vertTexCoord).r);
	fragColor = vec4(min(1.0, sdfSample)) * vertColor;
}