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 h = 0;
29
layout (constant_id = shape_constant_id_offset + 2) const int c = 0;
30
layout (constant_id = shape_constant_id_offset + 3) const int cstep = 0;
31

32
layout (constant_id = shape_constant_id_offset + 4) const int outw = 0;
33
layout (constant_id = shape_constant_id_offset + 5) const int outcstep = 0;
34

35
#if NCNN_image_shader
36
layout (binding = 0) uniform unfp sampler3D bottom_blob;
37
layout (binding = 1, imfmtc1) writeonly uniform unfp image3D top_blob;
38
#else
39
layout (binding = 0) readonly buffer bottom_blob { sfp bottom_blob_data[]; };
40
layout (binding = 1) writeonly buffer top_blob { sfp top_blob_data[]; };
41
#endif
42

43
layout (push_constant) uniform parameter
44
{
45
    int w;
46
    int h;
47
    int c;
48
    int cstep;
49

50
    int outw;
51
    int outcstep;
52
} p;
53

54
void main()
55
{
56
    int gx = int(gl_GlobalInvocationID.x);
57
    int gy = int(gl_GlobalInvocationID.y);
58
    int gz = int(gl_GlobalInvocationID.z);
59

60
    if (gx >= psc(outw) || gy >= 1 || gz >= psc(c))
61
        return;
62

63
    const int size_1 = psc(w) * psc(h) - 1;
64

65
    const int v_offset = gz * psc(cstep);
66

67
    afp res = afp(-FLT_MAX);
68

69
    for (int ii = 0; ii < 8; ii++)
70
    {
71
        int i = min(gx + ii * psc(outw), size_1);
72

73
#if NCNN_image_shader
74
        int y = i / psc(w);
75
        int x = i % psc(w);
76
        afp v = image3d_ld1(bottom_blob, ivec3(x, y, gz));
77
#else
78
        afp v = buffer_ld1(bottom_blob_data, v_offset + i);
79
#endif
80
        res = max(res, v);
81
    }
82

83
#if NCNN_image_shader
84
    image3d_st1(top_blob, ivec3(gx, 0, gz), res);
85
#else
86
    buffer_st1(top_blob_data, gz * psc(outcstep) + gx, res);
87
#endif
88
}
89