@deck.gl/core/dist/shaderlib/picking/picking.js

deck.gl core library

// deck.gl
// SPDX-License-Identifier: MIT
// Copyright (c) vis.gl contributors
import { picking } from '@luma.gl/shadertools';
const sourceWGSL = /* wgsl */ `\
struct pickingUniforms {
  isActive: f32,
  isAttribute: f32,
  isHighlightActive: f32,
  useByteColors: f32,
  highlightedObjectColor: vec3<f32>,
  highlightColor: vec4<f32>,
};

@group(0) @binding(auto) var<uniform> picking: pickingUniforms;

fn picking_normalizeColor(color: vec3<f32>) -> vec3<f32> {
  return select(color, color / 255.0, picking.useByteColors > 0.5);
}

fn picking_normalizeColor4(color: vec4<f32>) -> vec4<f32> {
  return select(color, color / 255.0, picking.useByteColors > 0.5);
}

fn picking_isColorZero(color: vec3<f32>) -> bool {
  return dot(color, vec3<f32>(1.0)) < 0.00001;
}

fn picking_isColorValid(color: vec3<f32>) -> bool {
  return dot(color, vec3<f32>(1.0)) > 0.00001;
}
`;
export default {
    ...picking,
    source: sourceWGSL,
    defaultUniforms: { ...picking.defaultUniforms, useByteColors: true },
    inject: {
        'vs:DECKGL_FILTER_GL_POSITION': `
    // for picking depth values
    picking_setPickingAttribute(position.z / position.w);
  `,
        'vs:DECKGL_FILTER_COLOR': `
  picking_setPickingColor(geometry.pickingColor);
  `,
        'fs:DECKGL_FILTER_COLOR': {
            order: 99,
            injection: `
  // use highlight color if this fragment belongs to the selected object.
  color = picking_filterHighlightColor(color);

  // use picking color if rendering to picking FBO.
  color = picking_filterPickingColor(color);
    `
        }
    }
};
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