/*
 * Copyright 2019 Teralytics
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */
export default `\
#define SHADER_NAME flow-circles-layer-fragment-shader
#define SOFT_OUTLINE 0.1
precision highp float;

varying vec4 vColor;
varying vec2 unitPosition;
varying float outerRadiusPixels;

void main(void) {
  geometry.uv = unitPosition;
  float distToCenter = length(unitPosition);
  if (distToCenter > 1.0) {
    discard;
  }
  gl_FragColor = vColor;
  gl_FragColor.a *= smoothstep(0.0, SOFT_OUTLINE, 1.0 - distToCenter);
  DECKGL_FILTER_COLOR(gl_FragColor, geometry);
}
`;