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 /*
  * Copyright (c) 2025 Advanced Micro Devices, Inc. All rights reserved.
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
  * in the Software without restriction, including without limitation the rights
  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  * copies of the Software, and to permit persons to whom the Software is
  * furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice shall be included in
  * all copies or substantial portions of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
  
 #pragma once
  
 #include <hip/hip_runtime.h>
  
 #include "core/detail/type_traits.hpp"
 #include "core/image_format.hpp"
  
 namespace roccv::detail {
  
 template <eSwizzle Pattern, int N>
 struct SwizzleIndexMap;
  
 // clang-format off
  
 // This section defines compile-time index mapping for all defined eSwizzle patterns using template specialization.
  
 // XYZW
 template <int N>
 struct SwizzleIndexMap<eSwizzle::XYZW, N> {
     using Seq = std::make_integer_sequence<size_t, N>;
 };
  
 // ZYXW
 template <> struct SwizzleIndexMap<eSwizzle::ZYXW, 1> { using Seq = std::integer_sequence<size_t, 0>; };
 template <> struct SwizzleIndexMap<eSwizzle::ZYXW, 3> { using Seq = std::integer_sequence<size_t, 2, 1, 0>; };
 template <> struct SwizzleIndexMap<eSwizzle::ZYXW, 4> { using Seq = std::integer_sequence<size_t, 2, 1, 0, 3>; };
 // clang-format on
  
 template <typename T, size_t... Indices>
 __host__ __device__ constexpr T SwizzleIndicesImpl(const T &v) {
     return T{v[Indices]...};
 }
  
 template <typename T, size_t... I>
 __host__ __device__ constexpr T ExpandSwizzle(const T &v, std::integer_sequence<size_t, I...>) {
     static_assert(((I < NumElements<T>) && ...), "Swizzle index out of range");
     return SwizzleIndicesImpl<T, I...>(v);
 }
  
 template <eSwizzle Pattern, typename T>
 __host__ __device__ constexpr T Swizzle(const T &v) {
     static_assert(HasTypeTraits<T> && IsCompound<T>, "Type must have type traits and be a compound type");
  
     constexpr int N = NumElements<T>;
     static_assert(N >= 1 && N <= 4, "Unsupported element count");
  
     using Seq = typename SwizzleIndexMap<Pattern, N>::Seq;
     return ExpandSwizzle<T>(v, Seq{});
 }
  
 }  // namespace roccv::detail