ncnn

1
// Tencent is pleased to support the open source community by making ncnn available.
2
//
3
// Copyright (C) 2023 THL A29 Limited, a Tencent company. All rights reserved.
4
//
5
// Licensed under the BSD 3-Clause License (the "License"); you may not use this file except
6
// in compliance with the License. You may obtain a copy of the License at
7
//
8
// https://opensource.org/licenses/BSD-3-Clause
9
//
10
// Unless required by applicable law or agreed to in writing, software distributed
11
// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
12
// CONDITIONS OF ANY KIND, either express or implied. See the License for the
13
// specific language governing permissions and limitations under the License.
14

15
#version 450
16

17
#if NCNN_fp16_storage
18
#extension GL_EXT_shader_16bit_storage: require
19
#endif
20
#if NCNN_fp16_arithmetic
21
#extension GL_EXT_shader_explicit_arithmetic_types_float16: require
22
#endif
23

24
#define FLT_MAX 3.402823466e+38
25

26
#define shape_constant_id_offset 0
27
layout (constant_id = shape_constant_id_offset + 0) const int w = 0;
28
layout (constant_id = shape_constant_id_offset + 1) const int c = 0;
29
layout (constant_id = shape_constant_id_offset + 2) const int cstep = 0;
30

31
#if NCNN_image_shader
32
layout (binding = 0) uniform unfp sampler3D bottom_blob;
33
layout (binding = 1, imfmtc4) writeonly uniform unfp image3D top_blob;
34
#else
35
layout (binding = 0) readonly buffer bottom_blob { sfpvec4 bottom_blob_data[]; };
36
layout (binding = 1) writeonly buffer top_blob { sfpvec4 top_blob_data[]; };
37
#endif
38

39
layout (push_constant) uniform parameter
40
{
41
    int w;
42
    int c;
43
    int cstep;
44
    int size;
45
} p;
46

47
void main()
48
{
49
    int gx = int(gl_GlobalInvocationID.x);
50
    int gy = int(gl_GlobalInvocationID.y);
51
    int gz = int(gl_GlobalInvocationID.z);
52

53
    if (gx >= 1 || gy >= 1 || gz >= psc(c))
54
        return;
55

56
    const int v_offset = gz * psc(cstep);
57

58
    afpvec4 res = afpvec4(-FLT_MAX);
59

60
    for (int i = 0; i < psc(w); i++)
61
    {
62
#if NCNN_image_shader
63
        afpvec4 v = image3d_ld4(bottom_blob, ivec3(i, 0, gz));
64
#else
65
        afpvec4 v = buffer_ld4(bottom_blob_data, v_offset + i);
66
#endif
67
        res = max(res, v);
68
    }
69

70
#if NCNN_image_shader
71
    image3d_st4(top_blob, ivec3(gz, 0, 0), res);
72
#else
73
    buffer_st4(top_blob_data, gz, res);
74
#endif
75
}
76