// 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 icon-layer-fragment-shader

precision highp float;

uniform float opacity;
uniform sampler2D iconsTexture;
uniform float alphaCutoff;

in float vColorMode;
in vec4 vColor;
in vec2 vTextureCoords;
in vec2 uv;

out vec4 fragColor;

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

  vec4 texColor = texture(iconsTexture, vTextureCoords);

  // if colorMode == 0, use pixel color from the texture
  // if colorMode == 1 or rendering picking buffer, use texture as transparency mask
  vec3 color = mix(texColor.rgb, vColor.rgb, vColorMode);
  // Take the global opacity and the alpha from vColor into account for the alpha component
  float a = texColor.a * opacity * vColor.a;

  if (a < alphaCutoff) {
    discard;
  }

  fragColor = vec4(color, a);
  DECKGL_FILTER_COLOR(fragColor, geometry);
}
`;