precision highp float;
varying vec2 texCoords;
uniform sampler2D textureSampler;
uniform vec3 drawColor;
uniform vec3 backgroundColor;

void main() {
  vec4 textureColor = texture2D(textureSampler, texCoords);
  float alphaValue = textureColor.a;

  vec3 resultColor = mix(backgroundColor, drawColor, alphaValue * 255.0);

  gl_FragColor = vec4(resultColor, 1);
}