/**
* \file dnn/src/cuda/warp_perspective/common.cuh
* MegEngine is Licensed under the Apache License, Version 2.0 (the "License")
*
* Copyright (c) 2014-2021 Megvii Inc. All rights reserved.
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT ARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
*/
#pragma once
#include "src/cuda/utils.cuh"
namespace megdnn {
namespace cuda {
namespace warp_perspective {
__device__ inline float sqr(float x) {
return x * x;
}
__device__ inline int mod(int i, int n) {
i %= n;
i += (i < 0) * n;
return i;
}
class ReplicateGetter {
public:
__device__ int operator()(int i, int n) { return min(max(i, 0), n - 1); }
};
class ReflectGetter {
public:
__device__ int operator()(int i, int n) {
n <<= 1;
i = mod(i, n);
return min(i, n - 1 - i);
}
};
class Reflect101Getter {
public:
__device__ int operator()(int i, int n) {
n = (n - 1) << 1;
i = mod(i, n);
return min(i, n - i);
}
};
class WrapGetter {
public:
__device__ int operator()(int i, int n) {
i = mod(i, n);
return i;
}
};
class ConstGetter {
public:
__device__ int operator()(int i, int n) { return i; }
};
} // namespace warp_perspective
} // namespace cuda
} // namespace megdnn
// vim: syntax=cpp.doxygen