ncnn/src/layer/shader/crop.comp

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// Copyright (C) 2019 THL A29 Limited, a Tencent company. All rights reserved.
//
// Licensed under the BSD 3-Clause License (the "License"); you may not use this file except
// in compliance with the License. You may obtain a copy of the License at
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// https://opensource.org/licenses/BSD-3-Clause
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#version 450

layout (constant_id = 0) const int woffset = 0;
layout (constant_id = 1) const int hoffset = 0;
layout (constant_id = 2) const int coffset = 0;

layout (local_size_x_id = 233) in;
layout (local_size_y_id = 234) in;
layout (local_size_z_id = 235) in;

layout (binding = 0) readonly buffer bottom_blob { float bottom_blob_data[]; };
layout (binding = 1) writeonly buffer top_blob { float top_blob_data[]; };

layout (push_constant) uniform parameter
{
    int dims;
    int w;
    int h;
    int c;
    int cstep;

    int outdims;
    int outw;
    int outh;
    int outc;
    int outcstep;
} p;

void main()
{
    int gx = int(gl_GlobalInvocationID.x);
    int gy = int(gl_GlobalInvocationID.y);
    int gz = int(gl_GlobalInvocationID.z);

    if (gx >= p.outw || gy >= p.outh || gz >= p.outc)
        return;

    int x = gx + woffset;
    int y = gy + hoffset;
    int z = gz + coffset;

    int v_offset = z * p.cstep + y * p.w + x;

    top_blob_data[gz * p.outcstep + gy * p.outw + gx] = bottom_blob_data[v_offset];
}