/**
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* @license
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* Copyright 2018 Google LLC. All Rights Reserved.
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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* =============================================================================
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*/
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import {GPGPUProgram} from './gpgpu_math';
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export class ComplexAbsProgram implements GPGPUProgram {
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variableNames = ['real', 'imag'];
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userCode: string;
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outputShape: number[];
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constructor(shape: number[]) {
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this.outputShape = shape;
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this.userCode = `
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void main() {
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float re = abs(getRealAtOutCoords());
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float im = abs(getImagAtOutCoords());
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float mx = max(re, im);
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// sadly the length function in glsl is not underflow-safe
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// (at least not on Intel GPUs). So the safe solution is
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// to ensure underflow-safety in all cases.
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setOutput(
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mx == 0.0 ? 0.0 : mx * length(vec2(1, min(re, im)/mx))
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);
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}
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`;
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}
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}
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