@luma.gl/effects/dist/passes/postprocessing/image-blur-filters/zoomblur.d.ts

Post-processing effects for luma.gl

/**
 * Zoom Blur - Blurs the image away from a certain point, which looks like radial motion blur.
 */
export type ZoomBlurProps = {
    /** - The x, y coordinate of the blur origin. */
    center?: [number, number];
    /** - The strength of the blur. Values in the range 0 to 1 are usually sufficient, where 0 doesn't change the image and 1 creates a highly blurred image. */
    strength?: number;
};
export type ZoomBlurUniforms = ZoomBlurProps;
/**
 * Zoom Blur
 * Blurs the image away from a certain point, which looks like radial motion blur.
 */
export declare const zoomBlur: {
    readonly name: "zoomBlur";
    readonly dependencies: [{
        readonly name: "random";
        readonly source: "fn random(scale: vec3f, seed: float) -> f32 {\n  /* use the fragment position for a different seed per-pixel */\n  return fract(sin(dot(gl_FragCoord.xyz + seed, scale)) * 43758.5453 + seed);\n}\n";
        readonly fs: "float random(vec3 scale, float seed) {\n  /* use the fragment position for a different seed per-pixel */\n  return fract(sin(dot(gl_FragCoord.xyz + seed, scale)) * 43758.5453 + seed);\n}\n";
    }];
    readonly source: "\nuniform zoomBlurUniforms {\n  center: vec2f,\n  strength: f32,\n};\n\n@group(0) @binding(1) var<uniform> zoomBlur : zoomBlurUniforms;\n\n\nfn zoomBlur_sampleColor(sampler2D source, vec2 texSize, vec2 texCoord) -> vec4f {\n  vec4 color = vec4(0.0);\n  float total = 0.0;\n  vec2 toCenter = zoomBlur.center * texSize - texCoord * texSize;\n\n  /* randomize the lookup values to hide the fixed number of samples */\n  float offset = random(vec3(12.9898, 78.233, 151.7182), 0.0);\n\n  for (float t = 0.0; t <= 40.0; t++) {\n    float percent = (t + offset) / 40.0;\n    float weight = 4.0 * (percent - percent * percent);\n    vec4 offsetColor = texture(source, texCoord + toCenter * percent * zoomBlur.strength / texSize);\n    color += offsetColor * weight;\n    total += weight;\n  }\n\n  color = color / total;\n  return color;\n}\n";
    readonly fs: "\nuniform zoomBlurUniforms {\n  vec2 center;\n  float strength;\n} zoomBlur;\n\nvec4 zoomBlur_sampleColor(sampler2D source, vec2 texSize, vec2 texCoord) {\n  vec4 color = vec4(0.0);\n  float total = 0.0;\n  vec2 toCenter = zoomBlur.center * texSize - texCoord * texSize;\n\n  /* randomize the lookup values to hide the fixed number of samples */\n  float offset = random(vec3(12.9898, 78.233, 151.7182), 0.0);\n\n  for (float t = 0.0; t <= 40.0; t++) {\n    float percent = (t + offset) / 40.0;\n    float weight = 4.0 * (percent - percent * percent);\n    vec4 offsetColor = texture(source, texCoord + toCenter * percent * zoomBlur.strength / texSize);\n    color += offsetColor * weight;\n    total += weight;\n  }\n\n  color = color / total;\n  return color;\n}\n";
    readonly props: ZoomBlurProps;
    readonly uniforms: ZoomBlurUniforms;
    readonly uniformTypes: {
        readonly center: "vec2<f32>";
        readonly strength: "f32";
    };
    readonly propTypes: {
        readonly center: {
            readonly value: readonly [0.5, 0.5];
        };
        readonly strength: {
            readonly value: 0.3;
            readonly min: 0;
            readonly softMax: 1;
        };
    };
    readonly passes: [{
        readonly sampler: true;
    }];
};
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