ncnn/src/layer/shader/deconvolutiondepthwise.comp

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// 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

#if NCNN_fp16_storage
#extension GL_EXT_shader_16bit_storage: require
#endif
#if NCNN_fp16_arithmetic
#extension GL_AMD_gpu_shader_half_float: require
#endif

layout (constant_id = 0) const int kernel_w = 1;
layout (constant_id = 1) const int kernel_h = 1;
layout (constant_id = 2) const int dilation_w = 1;
layout (constant_id = 3) const int dilation_h = 1;
layout (constant_id = 4) const int stride_w = 1;
layout (constant_id = 5) const int stride_h = 1;
layout (constant_id = 6) const int bias_term = 0;
layout (constant_id = 7) const int group = 1;

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 { sfp bottom_blob_data[]; };
layout (binding = 1) writeonly buffer top_blob { sfp top_blob_data[]; };
layout (binding = 2) readonly buffer weight_blob { sfp weight_data[]; };
layout (binding = 3) readonly buffer bias_blob { sfp bias_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;

    afp sum;

    if (bias_term == 1)
    {
        sum = afp(bias_data[gz]);
    }
    else
    {
        sum = afp(0.f);
    }

    const int kernel_extent_w = dilation_w * (kernel_w - 1) + 1;
    const int kernel_extent_h = dilation_h * (kernel_h - 1) + 1;

    // depth-wise deconvolution
    int v_offset_0 = gz * p.cstep;
    int w_offset_0 = gz * kernel_w * kernel_h;

    for (int y = 0; y < kernel_h; y++)
    {
        int sys = (gy + y * dilation_h - (kernel_extent_h - 1));
        if (sys % stride_h != 0)
            continue;

        int sy = sys / stride_h;
        if (sy < 0 || sy >= p.h)
            continue;

        for (int x = 0; x < kernel_w; x++)
        {
            int sxs = (gx + x * dilation_w - (kernel_extent_w - 1));
            if (sxs % stride_w != 0)
                continue;

            int sx = sxs / stride_w;
            if (sx < 0 || sx >= p.w)
                continue;

            int v_offset = v_offset_0 + sy * p.w + sx;
            int w_offset = w_offset_0 + y * kernel_w + x;

            sum += afp(weight_data[w_offset]) * afp(bottom_blob_data[v_offset]);
        }
    }

    top_blob_data[gz * p.outcstep + gy * p.outw + gx] = sfp(sum);
}