Added basic Window interface

3rdparty/include/SDL/begin_code.h

@@ -0,0 +1,170 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+
+/**
+ *  \file begin_code.h
+ *
+ *  This file sets things up for C dynamic library function definitions,
+ *  static inlined functions, and structures aligned at 4-byte alignment.
+ *  If you don't like ugly C preprocessor code, don't look at this file. :)
+ */
+
+/* This shouldn't be nested -- included it around code only. */
+#ifdef _begin_code_h
+#error Nested inclusion of begin_code.h
+#endif
+#define _begin_code_h
+
+#ifndef SDL_DEPRECATED
+#  if (__GNUC__ >= 4)  /* technically, this arrived in gcc 3.1, but oh well. */
+#    define SDL_DEPRECATED __attribute__((deprecated))
+#  else
+#    define SDL_DEPRECATED
+#  endif
+#endif
+
+#ifndef SDL_UNUSED
+#  ifdef __GNUC__
+#    define SDL_UNUSED __attribute__((unused))
+#  else
+#    define SDL_UNUSED
+#  endif
+#endif
+
+/* Some compilers use a special export keyword */
+#ifndef DECLSPEC
+# if defined(__WIN32__) || defined(__WINRT__)
+#  ifdef __BORLANDC__
+#   ifdef BUILD_SDL
+#    define DECLSPEC
+#   else
+#    define DECLSPEC    __declspec(dllimport)
+#   endif
+#  else
+#   define DECLSPEC __declspec(dllexport)
+#  endif
+# elif defined(__OS2__)
+#   ifdef BUILD_SDL
+#    define DECLSPEC    __declspec(dllexport)
+#   else
+#    define DECLSPEC
+#   endif
+# else
+#  if defined(__GNUC__) && __GNUC__ >= 4
+#   define DECLSPEC __attribute__ ((visibility("default")))
+#  else
+#   define DECLSPEC
+#  endif
+# endif
+#endif
+
+/* By default SDL uses the C calling convention */
+#ifndef SDLCALL
+#if (defined(__WIN32__) || defined(__WINRT__)) && !defined(__GNUC__)
+#define SDLCALL __cdecl
+#elif defined(__OS2__) || defined(__EMX__)
+#define SDLCALL _System
+# if defined (__GNUC__) && !defined(_System)
+#  define _System /* for old EMX/GCC compat.  */
+# endif
+#else
+#define SDLCALL
+#endif
+#endif /* SDLCALL */
+
+/* Removed DECLSPEC on Symbian OS because SDL cannot be a DLL in EPOC */
+#ifdef __SYMBIAN32__
+#undef DECLSPEC
+#define DECLSPEC
+#endif /* __SYMBIAN32__ */
+
+/* Force structure packing at 4 byte alignment.
+   This is necessary if the header is included in code which has structure
+   packing set to an alternate value, say for loading structures from disk.
+   The packing is reset to the previous value in close_code.h
+ */
+#if defined(_MSC_VER) || defined(__MWERKS__) || defined(__BORLANDC__)
+#ifdef _MSC_VER
+#pragma warning(disable: 4103)
+#endif
+#ifdef __clang__
+#pragma clang diagnostic ignored "-Wpragma-pack"
+#endif
+#ifdef __BORLANDC__
+#pragma nopackwarning
+#endif
+#ifdef _M_X64
+/* Use 8-byte alignment on 64-bit architectures, so pointers are aligned */
+#pragma pack(push,8)
+#else
+#pragma pack(push,4)
+#endif
+#endif /* Compiler needs structure packing set */
+
+#ifndef SDL_INLINE
+#if defined(__GNUC__)
+#define SDL_INLINE __inline__
+#elif defined(_MSC_VER) || defined(__BORLANDC__) || \
+      defined(__DMC__) || defined(__SC__) || \
+      defined(__WATCOMC__) || defined(__LCC__) || \
+      defined(__DECC) || defined(__CC_ARM)
+#define SDL_INLINE __inline
+#ifndef __inline__
+#define __inline__ __inline
+#endif
+#else
+#define SDL_INLINE inline
+#ifndef __inline__
+#define __inline__ inline
+#endif
+#endif
+#endif /* SDL_INLINE not defined */
+
+#ifndef SDL_FORCE_INLINE
+#if defined(_MSC_VER)
+#define SDL_FORCE_INLINE __forceinline
+#elif ( (defined(__GNUC__) && (__GNUC__ >= 4)) || defined(__clang__) )
+#define SDL_FORCE_INLINE __attribute__((always_inline)) static __inline__
+#else
+#define SDL_FORCE_INLINE static SDL_INLINE
+#endif
+#endif /* SDL_FORCE_INLINE not defined */
+
+#ifndef SDL_NORETURN
+#if defined(__GNUC__)
+#define SDL_NORETURN __attribute__((noreturn))
+#elif defined(_MSC_VER)
+#define SDL_NORETURN __declspec(noreturn)
+#else
+#define SDL_NORETURN
+#endif
+#endif /* SDL_NORETURN not defined */
+
+/* Apparently this is needed by several Windows compilers */
+#if !defined(__MACH__)
+#ifndef NULL
+#ifdef __cplusplus
+#define NULL 0
+#else
+#define NULL ((void *)0)
+#endif
+#endif /* NULL */
+#endif /* ! Mac OS X - breaks precompiled headers */