/**
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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 {getChannels, getSourceCoords} 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 UnpackProgram implements GPGPUProgram {
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variableNames = ['A'];
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packedInputs = true;
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packedOutput = false;
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outputShape: number[];
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userCode: string;
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constructor(outputShape: number[]) {
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this.outputShape = outputShape;
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const rank = outputShape.length;
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const channels = getChannels('rc', rank);
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const dtype = getCoordsDataType(rank);
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const sourceCoords = getSourceCoords(rank, channels);
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const innerDims = channels.slice(-2);
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const coords = rank <= 1 ? 'rc' : `vec2(${innerDims.join(',')})`;
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this.userCode = `
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void main() {
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${dtype} rc = getOutputCoords();
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vec4 packedInput = getA(${sourceCoords});
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setOutput(getChannel(packedInput, ${coords}));
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}
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`;
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}
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}
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