#version 300

//modified from https://gamedev.stackexchange.com/q/159657/99481
uniform sampler2D u_texture;
uniform float u_smoothing;
in vec4 v_color;
in vec2 v_texCoords;
out vec4 fragColor;

void main() {
  // SDF
  vec4 tex_color = texture(u_texture, v_texCoords);
  float tex_distance = tex_color.a;
  float min_bound = 0.5f - u_smoothing;
  float max_bound = 0.5f + u_smoothing;
  float alpha = smoothstep(min_bound, max_bound, tex_distance);
  float v_alpha = v_color.a
  float sdfAlpha = alpha * v_alpha;
  vec3 sdfRGB = v_color.rgb;
  vec4 sdfColor = vec4(sdfRGB, sdfAlpha);

  // Regular
  vec4 regularColor = v_color * tex_color;

  float v_x = v_texCoords.x;
  float sdf_step = step(1.0f, v_x);
  // Making a choice
  fragColor = mix(regularColor, sdfColor, sdf_step);
}