/**
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* @license
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* Copyright 2019 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 {getVecChannels} from '../packing_util';
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import {GPGPUProgram} from './gpgpu_math';
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import {getCoordsDataType} from './shader_compiler';
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export class TransposePackedProgram 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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packedInputs = true;
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packedOutput = true;
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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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if (this.rank > 6) {
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throw Error(
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`Packed transpose for rank ${this.rank} is not yet supported.`);
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}
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const dtype = getCoordsDataType(this.rank);
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const outputOrder = getVecChannels('rc', this.rank);
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const switchedOrder = new Array(this.rank);
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for (let i = 0; i < newDim.length; i++) {
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switchedOrder[newDim[i]] = outputOrder[i];
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}
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const innerDims = `vec2(${switchedOrder.slice(-2).join()})`;
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const nextColumn =
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`++${outputOrder[this.rank - 1]} < ${outputShape[this.rank - 1]}`;
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const getc = `getChannel(getA(${switchedOrder.join()}), ${innerDims})`;
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this.userCode = `
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void main() {
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${dtype} rc = getOutputCoords();
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vec4 result = vec4(0.);
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result[0] = ${getc};
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if(${nextColumn}) {
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result[1] = ${getc};
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}
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--${outputOrder[this.rank - 1]};
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if(++${outputOrder[this.rank - 2]} < ${outputShape[this.rank - 2]}) {
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result[2] = ${getc};
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if(${nextColumn}) {
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result[3] = ${getc};
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}
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}
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setOutput(result);
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}
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`;
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}
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}
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