/**
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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 StridedSliceProgram 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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begin: number[], strides: number[], size: number[]) {
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this.outputShape = size;
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const rank = size.length;
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const inputDtype = getCoordsDataType(size.length);
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const dtype = getCoordsDataType(size.length);
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let newCoords = '';
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if (rank === 1) {
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newCoords = 'coords * strides + begin';
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} else {
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let outputAxis = 0;
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newCoords =
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size.map((_, i) => {
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outputAxis++;
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return size.length === 1 ?
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`coords * strides[${i}] + begin[${i}]` :
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`coords[${outputAxis - 1}] * strides[${i}] + begin[${i}]`;
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})
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.join(',');
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}
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this.userCode = `
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${inputDtype} begin = ${inputDtype}(${begin});
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${inputDtype} strides = ${inputDtype}(${strides});
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void main() {
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${dtype} coords = getOutputCoords();
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setOutput(getX(${newCoords}));
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}
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`;
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}
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}
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