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Make WinRT's SDL_main header-only

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As the implementation requires C++, the user will have to include
SDL_main.h in a C++ source file (that needs to be compiled with /ZW).
It's ok to keep the standard main() implementation in plain C and use
an otherwise empty C++ source file for the SDL_main implementation part,
if both source files #include <SDL3/SDL_main.h>

Including SDL_main.h in a C source file will print a message at
compilation (when building for WinRT or possibly other not yet implemented
platforms that require C++ for main), to remind the user of also
including it in a .cpp source file. This message/warning can be disabled
with #define SDL_MAIN_NOIMPL before including SDL_main.h in the C file.
When including it in a .cpp file, there will be a compiler error with
helpful message if it's not compiled with /ZW

For this I renamend _SDL_MAIN_NOIMPL to SDL_MAIN_NOIMPL, because now it's
not for internal use only anymore, but also useful for users (that want
their main() function in a different file than the SDL_main implementation)

Add a project for the testdraw2.c test to the WinRT solution to at least
get some minimal testing on WinRT.
I won't add all tests because it's a lot of manual clicking per test,
but this should be better than nothing :)
This commit is contained in:
Daniel Gibson
2022-12-12 01:22:43 +01:00
committed by Sam Lantinga
parent 8e0693c982
commit 28b93451dc
20 changed files with 634 additions and 78 deletions
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55
src/main/winrt/SDL_winrt_main_NonXAML.cpp
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@@ -1,55 +0,0 @@
/*
SDL_winrt_main_NonXAML.cpp, placed in the public domain by David Ludwig 3/13/14
*/
#include <SDL3/SDL.h>
#include <SDL3/SDL_main.h> /* until this SDL_main impl is converted to header-only.. */
#include <wrl.h>
/* At least one file in any SDL/WinRT app appears to require compilation
with C++/CX, otherwise a Windows Metadata file won't get created, and
an APPX0702 build error can appear shortly after linking.
The following set of preprocessor code forces this file to be compiled
as C++/CX, which appears to cause Visual C++ 2012's build tools to
create this .winmd file, and will help allow builds of SDL/WinRT apps
to proceed without error.
If other files in an app's project enable C++/CX compilation, then it might
be possible for SDL_winrt_main_NonXAML.cpp to be compiled without /ZW,
for Visual C++'s build tools to create a winmd file, and for the app to
build without APPX0702 errors. In this case, if
SDL_WINRT_METADATA_FILE_AVAILABLE is defined as a C/C++ macro, then
the #error (to force C++/CX compilation) will be disabled.
Please note that /ZW can be specified on a file-by-file basis. To do this,
right click on the file in Visual C++, click Properties, then change the
setting through the dialog that comes up.
*/
#ifndef SDL_WINRT_METADATA_FILE_AVAILABLE
#ifndef __cplusplus_winrt
#error SDL_winrt_main_NonXAML.cpp must be compiled with /ZW, otherwise build errors due to missing .winmd files can occur.
#endif
#endif
/* Prevent MSVC++ from warning about threading models when defining our
custom WinMain. The threading model will instead be set via a direct
call to Windows::Foundation::Initialize (rather than via an attributed
function).
To note, this warning (C4447) does not seem to come up unless this file
is compiled with C++/CX enabled (via the /ZW compiler flag).
*/
#ifdef _MSC_VER
#pragma warning(disable : 4447)
#endif
/* Make sure the function to initialize the Windows Runtime gets linked in. */
#ifdef _MSC_VER
#pragma comment(lib, "runtimeobject.lib")
#endif
int CALLBACK WinMain(HINSTANCE, HINSTANCE, LPSTR, int)
{
return SDL_WinRTRunApp(SDL_main, NULL);
}