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
struct sfpvec8 { f16vec4 abcd; f16vec4 efgh; };
20
#endif
21
#if NCNN_fp16_arithmetic
22
#extension GL_EXT_shader_explicit_arithmetic_types_float16: require
23
#endif
24

25
#define FLT_MAX 3.402823466e+38
26

27
#define shape_constant_id_offset 0
28
layout (constant_id = shape_constant_id_offset + 0) const int w = 0;
29
layout (constant_id = shape_constant_id_offset + 1) const int c = 0;
30
layout (constant_id = shape_constant_id_offset + 2) const int cstep = 0;
31

32
#if NCNN_image_shader
33
layout (binding = 0) uniform unfp sampler3D bottom_blob;
34
layout (binding = 1, imfmtc4) writeonly uniform unfp image3D top_blob;
35
#else
36
layout (binding = 0) readonly buffer bottom_blob { sfpvec8 bottom_blob_data[]; };
37
layout (binding = 1) writeonly buffer top_blob { sfpvec8 top_blob_data[]; };
38
#endif
39

40
layout (push_constant) uniform parameter
41
{
42
    int w;
43
    int c;
44
    int cstep;
45
    int size;
46
} p;
47

48
void main()
49
{
50
    int gx = int(gl_GlobalInvocationID.x);
51
    int gy = int(gl_GlobalInvocationID.y);
52
    int gz = int(gl_GlobalInvocationID.z);
53

54
    if (gx >= 1 || gy >= 1 || gz >= psc(c))
55
        return;
56

57
    const int v_offset = gz * psc(cstep);
58

59
    afpvec8 res = afpvec8(afpvec4(-FLT_MAX), afpvec4(-FLT_MAX));
60

61
    for (int i = 0; i < psc(w); i++)
62
    {
63
#if NCNN_image_shader
64
        afpvec8 v = image3d_ld8(bottom_blob, ivec3(i, 0, gz));
65
#else
66
        afpvec8 v = buffer_ld8(bottom_blob_data, v_offset + i);
67
#endif
68
        res[0] = max(res[0], v[0]);
69
        res[1] = max(res[1], v[1]);
70
    }
71

72
#if NCNN_image_shader
73
    image3d_st8(top_blob, ivec3(gz, 0, 0), res);
74
#else
75
    buffer_st8(top_blob_data, gz, res);
76
#endif
77
}
78