/**
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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 * as concat_util from '../../ops/concat_util';
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import {GPGPUProgram} from './gpgpu_math';
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export class ConcatProgram implements GPGPUProgram {
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variableNames: string[];
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outputShape: number[] = [];
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userCode: string;
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// Concats 2d tensors along axis=1. See comments in MathBackendWebGL.concat().
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constructor(shapes: Array<[number, number]>) {
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this.outputShape = concat_util.computeOutShape(shapes, 1 /* axis */);
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this.variableNames = shapes.map((_, i) => `T${i}`);
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const offsets: number[] = new Array(shapes.length - 1);
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offsets[0] = shapes[0][1];
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for (let i = 1; i < offsets.length; i++) {
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offsets[i] = offsets[i - 1] + shapes[i][1];
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}
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const snippets = [`if (yC < ${offsets[0]}) setOutput(getT0(yR, yC));`];
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for (let i = 1; i < offsets.length; i++) {
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const shift = offsets[i - 1];
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snippets.push(
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`else if (yC < ${offsets[i]}) ` +
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`setOutput(getT${i}(yR, yC-${shift}));`);
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}
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const lastIndex = offsets.length;
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const lastShift = offsets[offsets.length - 1];
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snippets.push(`else setOutput(getT${lastIndex}(yR, yC-${lastShift}));`);
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this.userCode = `
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void main() {
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ivec2 coords = getOutputCoords();
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int yR = coords.x;
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int yC = coords.y;
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${snippets.join('\n ')}
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}
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`;
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}
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}
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