@luma.gl/effects/dist/passes/postprocessing/image-warp-filters/bulgepinch.js

Post-processing effects for luma.gl

// luma.gl
// SPDX-License-Identifier: MIT
// Copyright (c) vis.gl contributors
import { warp } from "./warp.js";
const source = /* wgsl */ `\
uniform bulgePinchUniforms {
  radius: f32,
  strength: f32,
  center: vec2f,
};

@group(0) @binding(1) var<uniform> bulgePinch: bulgePinchUniforms;

fn bulgePinch_warp(vec2 coord, vec2 texCenter) -> vec2f {
  coord -= texCenter;
  float distance = length(coord);
  if (distance < bulgePinch.radius) {
    float percent = distance / bulgePinch.radius;
    if (bulgePinch.strength > 0.0) {
      coord *= mix(1.0, smoothstep(0.0, bulgePinch.radius / distance, percent), bulgePinch.strength * 0.75);
    } else {
      coord *= mix(1.0, pow(percent, 1.0 + bulgePinch.strength * 0.75) * bulgePinch.radius / distance, 1.0 - percent);
    }
  }
  coord += texCenter;
  return coord;
}

fn bulgePinch_sampleColor(sampler2D source, vec2 texSize, vec2 texCoord) -> vec4f {
  vec2 coord = texCoord * texSize;
  coord = bulgePinch_warp(coord, bulgePinch.center * texSize);
  return warp_sampleColor(source, texSize, coord);
}
`;
const fs = /* glsl */ `\
uniform bulgePinchUniforms {
  float radius;
  float strength;
  vec2 center;
} bulgePinch;

vec2 bulgePinch_warp(vec2 coord, vec2 texCenter) {
  coord -= texCenter;
  float distance = length(coord);
  if (distance < bulgePinch.radius) {
    float percent = distance / bulgePinch.radius;
    if (bulgePinch.strength > 0.0) {
      coord *= mix(1.0, smoothstep(0.0, bulgePinch.radius / distance, percent), bulgePinch.strength * 0.75);
    } else {
      coord *= mix(1.0, pow(percent, 1.0 + bulgePinch.strength * 0.75) * bulgePinch.radius / distance, 1.0 - percent);
    }
  }
  coord += texCenter;
  return coord;
}

vec4 bulgePinch_sampleColor(sampler2D source, vec2 texSize, vec2 texCoord) {
  vec2 coord = texCoord * texSize;
  coord = bulgePinch_warp(coord, bulgePinch.center * texSize);

  return warp_sampleColor(source, texSize, coord);
}
`;
/**
 * Bulge / Pinch -
 * Bulges or pinches the image in a circle.
 */
export const bulgePinch = {
    name: 'bulgePinch',
    dependencies: [warp],
    source,
    fs,
    props: {},
    uniforms: {},
    uniformTypes: {
        center: 'vec2<f32>',
        radius: 'f32',
        strength: 'f32'
    },
    propTypes: {
        center: { value: [0.5, 0.5] },
        radius: { value: 200, min: 1, softMax: 600 },
        strength: { value: 0.5, min: -1, max: 1 }
    },
    passes: [{ sampler: true }]
};
//# sourceMappingURL=bulgepinch.js.map