/**
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* @license
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* Copyright 2017 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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import {GPGPUProgram} from './gpgpu_math';
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import {getCoordsDataType} from './shader_compiler';
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export class PadProgram implements GPGPUProgram {
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variableNames = ['x'];
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outputShape: number[];
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userCode: string;
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constructor(
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xShape: number[], paddings: Array<[number, number]>,
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constantValue: number) {
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this.outputShape = paddings.map(
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(p, i) => p[0] /* beforePad */ + xShape[i] + p[1] /* afterPad */);
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const rank = xShape.length;
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const type = getCoordsDataType(rank);
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const start = paddings.map(p => p[0]).join(',');
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const end = paddings.map((p, i) => p[0] + xShape[i]).join(',');
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const unpackedCoords =
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['coords[0]', 'coords[1]', 'coords[2]', 'coords[3]'].slice(0, rank);
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if (rank === 1) {
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this.userCode = `
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int start = ${start};
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int end = ${end};
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void main() {
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int outC = getOutputCoords();
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if (outC < start || outC >= end) {
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setOutput(float(${constantValue}));
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} else {
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setOutput(getX(outC - start));
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}
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}
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`;
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return;
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}
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this.userCode = `
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${type} start = ${type}(${start});
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${type} end = ${type}(${end});
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void main() {
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${type} outC = getOutputCoords();
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if (any(lessThan(outC, start)) || any(greaterThanEqual(outC, end))) {
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setOutput(float(${constantValue}));
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} else {
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${type} coords = outC - start;
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setOutput(getX(${unpackedCoords}));
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}
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}
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`;
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}
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}
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