"use strict";
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/**
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* @license
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* Copyright 2018 Google Inc. 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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Object.defineProperty(exports, "__esModule", { value: true });
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exports.COMPLEX_FFT = {
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REAL: 'return real * expR - imag * expI;',
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IMAG: 'return real * expI + imag * expR;'
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};
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var FFTProgram = /** @class */ (function () {
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function FFTProgram(op, inputShape, inverse) {
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this.variableNames = ['real', 'imag'];
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var innerDim = inputShape[1];
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this.outputShape = inputShape;
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var exponentMultiplierSnippet = inverse ? "2.0 * " + Math.PI : "-2.0 * " + Math.PI;
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var resultDenominator = inverse ? innerDim + ".0" : '1.0';
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this.userCode = "\n const float exponentMultiplier = " + exponentMultiplierSnippet + ";\n\n float unaryOpComplex(float real, float expR, float imag, float expI) {\n " + op + "\n }\n\n float mulMatDFT(int batch, int index) {\n float indexRatio = float(index) / float(" + innerDim + ");\n float exponentMultiplierTimesIndexRatio =\n exponentMultiplier * indexRatio;\n\n float result = 0.0;\n\n for (int i = 0; i < " + innerDim + "; i++) {\n // x = (-2|2 * PI / N) * index * i;\n float x = exponentMultiplierTimesIndexRatio * float(i);\n float expR = cos(x);\n float expI = sin(x);\n float real = getReal(batch, i);\n float imag = getImag(batch, i);\n\n result +=\n unaryOpComplex(real, expR, imag, expI) / " + resultDenominator + ";\n }\n\n return result;\n }\n\n void main() {\n ivec2 coords = getOutputCoords();\n setOutput(mulMatDFT(coords[0], coords[1]));\n }\n ";
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}
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return FFTProgram;
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}());
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exports.FFTProgram = FFTProgram;
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//# sourceMappingURL=fft_gpu.js.map
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