// Copyright 2016 The SwiftShader Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#ifndef sw_Types_hpp
#define sw_Types_hpp

#include <limits>
#include <type_traits>

// GCC warns against bitfields not fitting the entire range of an enum with a fixed underlying type of unsigned int, which gets promoted to an error with -Werror and cannot be suppressed.
// However, GCC already defaults to using unsigned int as the underlying type of an unscoped enum without a fixed underlying type. So we can just omit it.
#if defined(__GNUC__) && !defined(__clang__)
namespace {enum E {}; static_assert(!std::numeric_limits<std::underlying_type<E>::type>::is_signed, "expected unscoped enum whose underlying type is not fixed to be unsigned");}
#define ENUM_UNDERLYING_TYPE_UNSIGNED_INT
#else
#define ENUM_UNDERLYING_TYPE_UNSIGNED_INT : unsigned int
#endif

#if defined(_MSC_VER)
	typedef signed __int8 int8_t;
	typedef signed __int16 int16_t;
	typedef signed __int32 int32_t;
	typedef signed __int64 int64_t;
	typedef unsigned __int8 uint8_t;
	typedef unsigned __int16 uint16_t;
	typedef unsigned __int32 uint32_t;
	typedef unsigned __int64 uint64_t;
	#define ALIGN(bytes, type) __declspec(align(bytes)) type
#else
	#include <stdint.h>
	#define ALIGN(bytes, type) type __attribute__((aligned(bytes)))
#endif

namespace sw {

typedef ALIGN(1, uint8_t) byte;
typedef ALIGN(2, uint16_t) word;
typedef ALIGN(4, uint32_t) dword;
typedef ALIGN(8, uint64_t) qword;
typedef ALIGN(16, uint64_t) qword2[2];
typedef ALIGN(4, uint8_t) byte4[4];
typedef ALIGN(8, uint8_t) byte8[8];
typedef ALIGN(16, uint8_t) byte16[16];
typedef ALIGN(8, uint16_t) word4[4];
typedef ALIGN(8, uint32_t) dword2[2];
typedef ALIGN(16, uint32_t) dword4[4];
typedef ALIGN(16, uint64_t) xword[2];

typedef ALIGN(1, int8_t) sbyte;
typedef ALIGN(4, int8_t) sbyte4[4];
typedef ALIGN(8, int8_t) sbyte8[8];
typedef ALIGN(16, int8_t) sbyte16[16];
typedef ALIGN(8, short) short4[4];
typedef ALIGN(8, unsigned short) ushort4[4];
typedef ALIGN(16, short) short8[8];
typedef ALIGN(16, unsigned short) ushort8[8];
typedef ALIGN(8, int) int2[2];
typedef ALIGN(8, unsigned int) uint2[2];
typedef ALIGN(16, unsigned int) uint4[4];

typedef ALIGN(8, float) float2[2];

template<typename T>
struct alignas(sizeof(T) * 4) vec4
{
	T x;
	T y;
	T z;
	T w;

	T &operator[](int i)
	{
		return (&x)[i];
	}

	const T &operator[](int i) const
	{
		return (&x)[i];
	}

	bool operator!=(const vec4 &rhs)
	{
		return x != rhs.x || y != rhs.y || z != rhs.z || w != rhs.w;
	}

	bool operator==(const vec4 &rhs)
	{
		return x == rhs.x && y == rhs.y && z == rhs.z && w == rhs.w;
	}
};

using int4 = vec4<int>;
using float4 = vec4<float>;

inline constexpr float4 vector(float x, float y, float z, float w)
{
	return { x, y, z, w };
}

inline constexpr float4 replicate(float f)
{
	return vector(f, f, f, f);
}

#define OFFSET(s,m) (int)(size_t)&reinterpret_cast<const volatile char&>((((s*)0)->m))

}  // namespace sw

#endif   // sw_Types_hpp