// Copyright (c) 2015 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 `\
#define SHADER_NAME flow-circles-layer-vertex-shader
#define radiusScale 100

attribute vec3 positions;

attribute vec3 instancePositions;
attribute vec3 instancePositions64Low;
attribute float instanceRadius;
attribute vec4 instanceColors;
attribute vec3 instancePickingColors;

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

void main(void) {
  geometry.worldPosition = instancePositions;

  outerRadiusPixels = instanceRadius;  

  // position on the containing square in [-1, 1] space
  unitPosition = positions.xy;
  geometry.uv = unitPosition;
  geometry.pickingColor = instancePickingColors;
                                                                                                    
  // Find the center of the point and add the current vertex
  vec3 offset = positions * project_pixel_size(outerRadiusPixels);
  DECKGL_FILTER_SIZE(offset, geometry);
  gl_Position = project_position_to_clipspace(instancePositions, instancePositions64Low, offset, geometry.position);
  DECKGL_FILTER_GL_POSITION(gl_Position, geometry);
                            
  // Apply opacity to instance color, or return instance picking color
  vColor = vec4(instanceColors.rgb / 255., instanceColors.a / 255. * opacity);
  DECKGL_FILTER_COLOR(vColor, geometry);
}
`;