/**
 * @filter       Triangle Blur
 * @description  This is the most basic blur filter, which convolves the image with a
 *               pyramid filter. The pyramid filter is separable and is applied as two
 *               perpendicular triangle filters.
 */
export type TriangleBlurProps = {
    /** The radius of the pyramid convolved with the image. */
    radius?: number;
    /** @deprecated internal property */
    delta?: [number, number];
};
export type TriangleBlurUniforms = TriangleBlurProps;
/**
 * @filter       Triangle Blur
 * @description  This is the most basic blur filter, which convolves the image with a
 *               pyramid filter. The pyramid filter is separable and is applied as two
 *               perpendicular triangle filters.
 */
export declare const triangleBlur: {
    readonly name: "triangleBlur";
    readonly dependencies: [{
        readonly name: "random";
        readonly source: "fn random(scale: vec3f, seed: f32) -> f32 {\n  return fract(sin(dot(scale + vec3f(seed), vec3f(12.9898, 78.233, 151.7182))) * 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: "struct triangleBlurUniforms {\n  radius: f32,\n  delta: vec2f,\n};\n\n@group(0) @binding(auto) var<uniform> triangleBlur: triangleBlurUniforms;\n\nfn triangleBlur_sampleColor(\n  sourceTexture: texture_2d<f32>,\n  sourceTextureSampler: sampler,\n  texSize: vec2f,\n  texCoord: vec2f\n) -> vec4f {\n  let adjustedDelta = triangleBlur.delta * triangleBlur.radius / texSize;\n\n  var color = vec4f(0.0);\n  var total = 0.0;\n\n  /* randomize the lookup values to hide the fixed number of samples */\n  let offset = random(vec3f(12.9898, 78.233, 151.7182), 0.0);\n\n  for (var t = -30.0; t <= 30.0; t += 1.0) {\n    let percent = (t + offset - 0.5) / 30.0;\n    let weight = 1.0 - abs(percent);\n    let offsetColor = textureSample(\n      sourceTexture,\n      sourceTextureSampler,\n      texCoord + adjustedDelta * percent\n    );\n\n    /* switch to pre-multiplied alpha to correctly blur transparent images */\n    let premultipliedOffsetColor = vec4f(offsetColor.rgb * vec3f(offsetColor.a), offsetColor.a);\n\n    color += premultipliedOffsetColor * weight;\n    total += weight;\n  }\n\n  color /= total;\n\n  /* switch back from pre-multiplied alpha */\n  let unpremultipliedRgb = color.rgb / vec3f(color.a + 0.00001);\n\n  return vec4f(unpremultipliedRgb, color.a);\n}\n";
    readonly fs: "layout(std140) uniform triangleBlurUniforms {\n  float radius;\n  vec2 delta;\n} triangleBlur;\n\nvec4 triangleBlur_sampleColor(sampler2D source, vec2 texSize, vec2 texCoord) {\n  vec2 adjustedDelta = triangleBlur.delta * triangleBlur.radius / texSize;\n\n  vec4 color = vec4(0.0);\n  float total = 0.0;\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 = -30.0; t <= 30.0; t++) {\n    float percent = (t + offset - 0.5) / 30.0;\n    float weight = 1.0 - abs(percent);\n    vec4 offsetColor = texture(source, texCoord + adjustedDelta * percent);\n\n    /* switch to pre-multiplied alpha to correctly blur transparent images */\n    offsetColor.rgb *= offsetColor.a;\n\n    color += offsetColor * weight;\n    total += weight;\n  }\n\n  color = color / total;\n\n  /* switch back from pre-multiplied alpha */\n  color.rgb /= color.a + 0.00001;\n\n  return color;\n}\n";
    readonly props: TriangleBlurProps;
    readonly uniforms: TriangleBlurUniforms;
    readonly uniformTypes: {
        readonly radius: "f32";
        readonly delta: "vec2<f32>";
    };
    readonly propTypes: {
        readonly radius: {
            readonly value: 20;
            readonly min: 0;
            readonly softMax: 100;
        };
        readonly delta: {
            readonly value: readonly [1, 0];
            readonly private: true;
        };
    };
    readonly passes: [{
        readonly sampler: true;
        readonly uniforms: {
            readonly delta: [1, 0];
        };
    }, {
        readonly sampler: true;
        readonly uniforms: {
            readonly delta: [0, 1];
        };
    }];
};
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