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

export default `\

in vec4 fillColors;
in vec4 lineColors;
in vec3 pickingColors;

out vec4 vColor;

struct PolygonProps {
  vec3 positions;
  vec3 positions64Low;
  vec3 normal;
  float elevations;
};

vec3 project_offset_normal(vec3 vector) {
  if (project.coordinateSystem == COORDINATE_SYSTEM_LNGLAT ||
    project.coordinateSystem == COORDINATE_SYSTEM_LNGLAT_OFFSETS) {
    // normals generated by the polygon tesselator are in lnglat offsets instead of meters
    return normalize(vector * project.commonUnitsPerWorldUnit);
  }
  return project_normal(vector);
}

void calculatePosition(PolygonProps props) {
  vec3 pos = props.positions;
  vec3 pos64Low = props.positions64Low;
  vec3 normal = props.normal;
  vec4 colors = solidPolygon.isWireframe ? lineColors : fillColors;

  geometry.worldPosition = props.positions;
  geometry.pickingColor = pickingColors;

  if (solidPolygon.extruded) {
    pos.z += props.elevations * solidPolygon.elevationScale;
  }
  gl_Position = project_position_to_clipspace(pos, pos64Low, vec3(0.), geometry.position);

  DECKGL_FILTER_GL_POSITION(gl_Position, geometry);

  if (solidPolygon.extruded) {
  #ifdef IS_SIDE_VERTEX
    normal = project_offset_normal(normal);
  #else
    normal = project_normal(normal);
  #endif
    geometry.normal = normal;
    vec3 lightColor = lighting_getLightColor(colors.rgb, project.cameraPosition, geometry.position.xyz, geometry.normal);
    vColor = vec4(lightColor, colors.a * layer.opacity);
  } else {
    vColor = vec4(colors.rgb, colors.a * layer.opacity);
  }
  DECKGL_FILTER_COLOR(vColor, geometry);
}
`;