// deck.gl
// SPDX-License-Identifier: MIT
// Copyright (c) vis.gl contributors

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

precision highp float;

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 = scatterplot.antialiasing ?
    smoothedge(distToCenter, outerRadiusPixels) : 
    step(distToCenter, outerRadiusPixels);

  if (inCircle == 0.0) {
    discard;
  }

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

    if (scatterplot.filled > 0.5) {
      fragColor = mix(vFillColor, vLineColor, isLine);
    } else {
      if (isLine == 0.0) {
        discard;
      }
      fragColor = vec4(vLineColor.rgb, vLineColor.a * isLine);
    }
  } else if (scatterplot.filled < 0.5) {
    discard;
  } else {
    fragColor = vFillColor;
  }

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