#version 300 es
precision highp float;
in vec2 vTexCoord;
in vec4 vColor;

uniform sampler2D uTexture;
uniform int uUseSDF;

out vec4 fragColor;

void main() {
    if (uUseSDF == 1) {
        float dist = texture(uTexture, vTexCoord).a;
        float sd = (dist - 0.502) * 3.98;
        float w = fwidth(sd);
        float alpha = smoothstep(-w, w, sd);
        fragColor = vec4(vColor.rgb, vColor.a * alpha);
    } else {
        fragColor = texture(uTexture, vTexCoord) * vColor;
    }
}