//
// Copyright (c) 2002-2014 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//

// angleutils.h: Common ANGLE utilities.

#ifndef COMMON_ANGLEUTILS_H_
#define COMMON_ANGLEUTILS_H_

#include "common/platform.h"

#include <climits>
#include <cstdarg>
#include <cstddef>
#include <string>
#include <set>
#include <sstream>
#include <vector>

// A helper class to disallow copy and assignment operators
namespace angle
{

class NonCopyable
{
  public:
    NonCopyable() = default;
    ~NonCopyable() = default;
  protected:
    NonCopyable(const NonCopyable&) = delete;
    void operator=(const NonCopyable&) = delete;
};

extern const uintptr_t DirtyPointer;
}

template <typename T, size_t N>
inline size_t ArraySize(T(&)[N])
{
    return N;
}

template <typename T, unsigned int N>
void SafeRelease(T (&resourceBlock)[N])
{
    for (unsigned int i = 0; i < N; i++)
    {
        SafeRelease(resourceBlock[i]);
    }
}

template <typename T>
void SafeRelease(T& resource)
{
    if (resource)
    {
        resource->Release();
        resource = NULL;
    }
}

template <typename T>
void SafeDelete(T*& resource)
{
    delete resource;
    resource = NULL;
}

template <typename T>
void SafeDeleteContainer(T& resource)
{
    for (auto &element : resource)
    {
        SafeDelete(element);
    }
    resource.clear();
}

template <typename T>
void SafeDeleteArray(T*& resource)
{
    delete[] resource;
    resource = NULL;
}

// Provide a less-than function for comparing structs
// Note: struct memory must be initialized to zero, because of packing gaps
template <typename T>
inline bool StructLessThan(const T &a, const T &b)
{
    return (memcmp(&a, &b, sizeof(T)) < 0);
}

// Provide a less-than function for comparing structs
// Note: struct memory must be initialized to zero, because of packing gaps
template <typename T>
inline bool StructEquals(const T &a, const T &b)
{
    return (memcmp(&a, &b, sizeof(T)) == 0);
}

template <typename T>
inline void StructZero(T *obj)
{
    memset(obj, 0, sizeof(T));
}

template <typename T>
inline bool IsMaskFlagSet(T mask, T flag)
{
    // Handles multibit flags as well
    return (mask & flag) == flag;
}

inline const char* MakeStaticString(const std::string &str)
{
    static std::set<std::string> strings;
    std::set<std::string>::iterator it = strings.find(str);
    if (it != strings.end())
    {
        return it->c_str();
    }

    return strings.insert(str).first->c_str();
}

inline std::string ArrayString(unsigned int i)
{
    // We assume UINT_MAX and GL_INVALID_INDEX are equal
    // See DynamicHLSL.cpp
    if (i == UINT_MAX)
    {
        return "";
    }

    std::stringstream strstr;

    strstr << "[";
    strstr << i;
    strstr << "]";

    return strstr.str();
}

inline std::string Str(int i)
{
    std::stringstream strstr;
    strstr << i;
    return strstr.str();
}

size_t FormatStringIntoVector(const char *fmt, va_list vararg, std::vector<char>& buffer);

std::string FormatString(const char *fmt, va_list vararg);
std::string FormatString(const char *fmt, ...);

// snprintf is not defined with MSVC prior to to msvc14
#if defined(_MSC_VER) && _MSC_VER < 1900
#define snprintf _snprintf
#endif

#define GL_BGRA4_ANGLEX 0x6ABC
#define GL_BGR5_A1_ANGLEX 0x6ABD
#define GL_INT_64_ANGLEX 0x6ABE
#define GL_STRUCT_ANGLEX 0x6ABF

// Hidden enum for the NULL D3D device type.
#define EGL_PLATFORM_ANGLE_DEVICE_TYPE_NULL_ANGLE 0x6AC0

#endif // COMMON_ANGLEUTILS_H_