/**
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* @license
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* Copyright 2018 Google LLC. 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 * as shader_util from './shader_compiler_util';
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export class ReshapePackedProgram implements GPGPUProgram {
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variableNames = ['A'];
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packedInputs = true;
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packedOutput = true;
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outputShape: number[];
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userCode: string;
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constructor(outputShape: [number, number, number], inputShape: [
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number, number, number
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]) {
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this.outputShape = outputShape;
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let mainLoop = ``;
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for (let i = 0; i < 4; i++) {
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let thisRC = `thisRC = rc;`;
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if (i % 2 === 1) {
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thisRC += `thisRC.z += 1;`;
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}
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if (i > 1) {
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thisRC += `thisRC.y += 1;`;
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}
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mainLoop += `
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${thisRC}
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${i > 0 ? `if(thisRC.y < rows && thisRC.z < cols){` : ''}
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int flatIndex = getFlatIndex(thisRC);
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ivec3 inputRC = inputCoordsFromReshapedOutCoords(flatIndex);
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vec2 inputRCInnerDims = vec2(float(inputRC.y),float(inputRC.z));
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result[${i}] =
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getChannel(getA(inputRC.x, inputRC.y, inputRC.z), inputRCInnerDims);
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${i > 0 ? '}' : ''}
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`;
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}
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this.userCode = `
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${getReshapedInputCoords(inputShape)}
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${shader_util.getFlatIndexFrom3D(outputShape)}
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void main() {
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ivec3 rc = getOutputCoords();
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vec4 result = vec4(0.);
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ivec3 thisRC;
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int rows = ${outputShape[1]};
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int cols = ${outputShape[2]};
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${mainLoop}
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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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function getReshapedInputCoords(shape: [number, number, number]): string {
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const coordsFromIndexSnippet =
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shader_util.getLogicalCoordinatesFromFlatIndex(['r', 'c', 'd'], shape);
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return `
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ivec3 inputCoordsFromReshapedOutCoords(int index) {
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${coordsFromIndexSnippet}
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return ivec3(r, c, d);
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}
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`;
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}
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