gx

chenyc

2025-06-12 7b72ac13a83764a662159d4a49b7fffb90476ecb

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/**
 * @license
 * Copyright 2017 Google LLC. All Rights Reserved.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * =============================================================================
 */
import { getCoordsDataType } from './shader_compiler';
export class SliceProgram {
    constructor(destSize) {
        this.variableNames = ['source'];
        this.outputShape = destSize;
        this.rank = destSize.length;
        const dtype = getCoordsDataType(this.rank);
        this.customUniforms = [{ name: 'start', arrayIndex: this.rank, type: 'int' }];
        const sourceCoords = getCoords(this.rank);
        let body;
        const coordSum = destSize.map((_, i) => {
            return `sourceLoc.${coords[i]} = start[${i}] + coords.${coords[i]};`;
        });
        body = `
        ${dtype} sourceLoc;
        ${dtype} coords = getOutputCoords();
        ${coordSum.join('\n')}
      `;
        this.userCode = `
      void main() {
        ${body}
        setOutput(getSource(${sourceCoords}));
      }
    `;
    }
}
const coords = ['x', 'y', 'z', 'w', 'u', 'v'];
function getCoords(rank) {
    if (rank === 1) {
        return 'sourceLoc';
    }
    else if (rank <= 6) {
        return coords.slice(0, rank).map(x => 'sourceLoc.' + x).join(',');
    }
    else {
        throw Error(`Slicing for rank ${rank} is not yet supported`);
    }
}
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