/**
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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 TransposeProgram implements GPGPUProgram {
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variableNames = ['A'];
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outputShape: number[];
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userCode: string;
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rank: number;
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constructor(aShape: number[], newDim: number[]) {
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const outputShape: number[] = new Array(aShape.length);
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for (let i = 0; i < outputShape.length; i++) {
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outputShape[i] = aShape[newDim[i]];
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}
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this.outputShape = outputShape;
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this.rank = outputShape.length;
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const dtype = getCoordsDataType(this.rank);
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const switched = getSwitchedCoords(newDim);
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this.userCode = `
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void main() {
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${dtype} resRC = getOutputCoords();
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setOutput(getA(${switched}));
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}
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`;
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}
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}
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function getSwitchedCoords(newDim: number[]): string {
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const rank = newDim.length;
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if (rank > 6) {
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throw Error(`Transpose for rank ${rank} is not yet supported`);
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}
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const originalOrder =
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['resRC.x', 'resRC.y', 'resRC.z', 'resRC.w', 'resRC.u', 'resRC.v'];
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const switchedCoords = new Array(rank);
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for (let i = 0; i < newDim.length; i++) {
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switchedCoords[newDim[i]] = originalOrder[i];
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}
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return switchedCoords.join();
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}
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