// Copyright (c) 2015 - 2017 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

export default `\
#version 300 es
#define SHADER_NAME scatterplot-layer-fragment-shader

precision highp float;

uniform bool filled;
uniform float stroked;
uniform bool antialiasing;

in vec4 vFillColor;
in vec4 vLineColor;
in vec2 unitPosition;
in float innerUnitRadius;
in float outerRadiusPixels;

out vec4 fragColor;

void main(void) {
  geometry.uv = unitPosition;

  float distToCenter = length(unitPosition) * outerRadiusPixels;
  float inCircle = antialiasing ? 
    smoothedge(distToCenter, outerRadiusPixels) : 
    step(distToCenter, outerRadiusPixels);

  if (inCircle == 0.0) {
    discard;
  }

  if (stroked > 0.5) {
    float isLine = antialiasing ? 
      smoothedge(innerUnitRadius * outerRadiusPixels, distToCenter) :
      step(innerUnitRadius * outerRadiusPixels, distToCenter);

    if (filled) {
      fragColor = mix(vFillColor, vLineColor, isLine);
    } else {
      if (isLine == 0.0) {
        discard;
      }
      fragColor = vec4(vLineColor.rgb, vLineColor.a * isLine);
    }
  } else if (!filled) {
    discard;
  } else {
    fragColor = vFillColor;
  }

  fragColor.a *= inCircle;
  DECKGL_FILTER_COLOR(fragColor, geometry);
}
`;