/**
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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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import {GPGPUProgram} from './gpgpu_math';
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export class DepthToSpaceProgram implements GPGPUProgram {
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variableNames = ['x'];
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outputShape: number[] = [];
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userCode: string;
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blockSize: number;
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dataFormat: string;
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constructor(
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outputShape: number[], blockSize: number, dataFormat: 'NHWC'|'NCHW') {
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this.outputShape = outputShape;
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this.blockSize = blockSize;
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this.dataFormat = dataFormat;
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this.userCode = `
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void main() {
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ivec4 coords = getOutputCoords();
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int b = coords[0];
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int h = ${this.getHeightCoordString()};
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int w = ${this.getWidthCoordString()};
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int d = ${this.getDepthCoordString()};
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int in_h = h / ${blockSize};
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int offset_h = imod(h, ${blockSize});
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int in_w = w / ${blockSize};
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int offset_w = imod(w, ${blockSize});
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int offset_d = (offset_h * ${blockSize} + offset_w) *
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${this.getOutputDepthSize()};
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int in_d = d + offset_d;
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float result = ${this.getInputSamplingString()};
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setOutput(result);
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}
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`;
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}
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private getHeightCoordString(): string {
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if (this.dataFormat === 'NHWC') {
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return `coords[1]`;
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} else {
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return `coords[2]`;
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}
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}
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private getWidthCoordString(): string {
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if (this.dataFormat === 'NHWC') {
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return `coords[2]`;
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} else {
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return `coords[3]`;
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}
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}
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private getDepthCoordString(): string {
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if (this.dataFormat === 'NHWC') {
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return `coords[3]`;
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} else {
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return `coords[1]`;
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}
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}
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private getOutputDepthSize(): number {
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if (this.dataFormat === 'NHWC') {
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return this.outputShape[3];
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} else {
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return this.outputShape[1];
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}
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}
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private getInputSamplingString(): string {
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if (this.dataFormat === 'NHWC') {
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return `getX(b, in_h, in_w, in_d)`;
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} else {
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return `getX(b, in_d, in_h, in_w)`;
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}
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}
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}
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