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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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

33
VisualC-WinRT/SDL-UWP.sln
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@ -1,10 +1,12 @@

Microsoft Visual Studio Solution File, Format Version 12.00
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@ -33,8 +35,35 @@ Global
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1
VisualC-WinRT/SDL-UWP.vcxproj
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@ -62,6 +62,7 @@
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<ClInclude Include="..\include\SDL3\SDL_log.h" />
<ClInclude Include="..\include\SDL3\SDL_main.h" />
<ClInclude Include="..\include\SDL3\SDL_main_impl.h" />
<ClInclude Include="..\include\SDL3\SDL_misc.h" />
<ClInclude Include="..\include\SDL3\SDL_mouse.h" />
<ClInclude Include="..\include\SDL3\SDL_mutex.h" />

3
VisualC-WinRT/SDL-UWP.vcxproj.filters
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@ -822,6 +822,9 @@
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49
VisualC-WinRT/TestDraw2/Package.appxmanifest Normal file
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336
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35
docs/README-winrt.md
View File

@ -71,10 +71,9 @@ Here is a rough list of what works, and what doesn't:
well as many keys with documented hardware scancodes. Converting
SDL_Scancodes to or from SDL_Keycodes may not work, due to missing APIs
(MapVirtualKey()) in Microsoft's Windows Store / UWP APIs.
* SDL_main. WinRT uses a different signature for each app's main() function.
SDL-based apps that use this port must compile in SDL_winrt_main_NonXAML.cpp
(in `SDL\src\main\winrt\`) directly in order for their C-style main()
functions to be called.
* SDL_main. WinRT uses a different signature for each app's main() function
and requires it to be implemented in C++, so SDL_main.h must be #include'd
in a C++ source file, that also must be compiled with /ZW.
* What doesn't work:
* compilation with anything other than Visual C++
@ -240,7 +239,9 @@ To change these settings:
2. choose "Properties"
3. in the drop-down box next to "Configuration", choose, "All Configurations"
4. in the drop-down box next to "Platform", choose, "All Platforms"
5. in the left-hand list, expand the "C/C++" section
5. in the left-hand list, expand the "C/C++" section
**Note:** If you don't see this section, you may have to add a .c or .cpp
Source file to the Project first.
6. select "General"
7. edit the "Additional Include Directories" setting, and add a path to SDL's
"include" directory
@ -271,16 +272,21 @@ To include these files for C/C++ projects:
navigate to "Add", then choose "Existing Item...".
2. navigate to the directory containing SDL's source code, then into its
subdirectory, 'src/main/winrt/'. Select, then add, the following files:
- `SDL_winrt_main_NonXAML.cpp`
- `SDL3-WinRTResources.rc`
- `SDL3-WinRTResource_BlankCursor.cur`
3. right-click on the file `SDL_winrt_main_NonXAML.cpp` (as listed in your
project), then click on "Properties...".
4. in the drop-down box next to "Configuration", choose, "All Configurations"
5. in the drop-down box next to "Platform", choose, "All Platforms"
6. in the left-hand list, click on "C/C++"
7. change the setting for "Consume Windows Runtime Extension" to "Yes (/ZW)".
8. click the OK button. This will close the dialog.
3. For the next step you need a C++ source file.
- If your standard main() function is implemented in a **C++** source file,
use that file.
- If your standard main() function is implemented in a **plain C** source file,
create an empty .cpp source file (e.g. `main.cpp`) that only contains the line
`#include <SDL3/SDL_main.h>` and use that file instead.
4. Right click on the C++ source file from step 3 (as listed in your project),
then click on "Properties...".
5. in the drop-down box next to "Configuration", choose, "All Configurations"
6. in the drop-down box next to "Platform", choose, "All Platforms"
7. in the left-hand list, click on "C/C++"
8. change the setting for "Consume Windows Runtime Extension" to "Yes (/ZW)".
9. click the OK button. This will close the dialog.
**NOTE: C++/CX compilation is currently required in at least one file of your
app's project. This is to make sure that Visual C++'s linker builds a 'Windows
@ -322,7 +328,8 @@ your project, and open the file in Visual C++'s text editor.
7. Copy and paste the following code into the new file, then save it.
```c
#include <SDL.h>
#include <SDL3/SDL.h>
#include <SDL3/SDL_main.h>
int main(int argc, char **argv)
{

18
include/SDL3/SDL_main.h
View File

@ -284,11 +284,25 @@ extern DECLSPEC void SDLCALL SDL_GDKSuspendComplete(void);
#include <SDL3/close_code.h>
#if !defined(SDL_MAIN_HANDLED) && !defined(_SDL_MAIN_NOIMPL)
#if !defined(SDL_MAIN_HANDLED) && !defined(SDL_MAIN_NOIMPL)
/* include header-only SDL_main implementations */
#if defined(__WIN32__) || defined(__GDK__) || defined(__IOS__) || defined(__TVOS__) /* TODO: other platforms */
#include <SDL3/SDL_main_impl.h>
#endif
#elif defined(__WINRT__) /* TODO: other C++ platforms */
#ifdef __cplusplus
#include <SDL3/SDL_main_impl.h>
#else
/* Note: to get rid of the following warning, you can #define SDL_MAIN_NOIMPL before including SDL_main.h
* in your C sourcefile that contains the standard main. Do *not* use SDL_MAIN_HANDLED for that, then SDL_main won't find your main()!
*/
#ifdef _MSC_VER
#pragma message("Note: Your platform needs the SDL_main implementation in a C++ source file. You can keep your main() in plain C (then continue including SDL_main.h there!) and create a fresh .cpp file that only contains #include <SDL3/SDL_main.h>")
#elif defined(__GNUC__) /* gcc, clang, mingw and compatible are matched by this and have #warning */
#warning "Note: Your platform needs the SDL_main implementation in a C++ source file. You can keep your main() in plain C and create a fresh .cpp file that only contains #include <SDL3/SDL_main.h>"
#endif /* __GNUC__ */
#endif /* __cplusplus */
#endif /* __WINRT__ etc */
#endif /* SDL_MAIN_HANDLED */

64
include/SDL3/SDL_main_impl.h
View File

@ -28,9 +28,12 @@
/* if someone wants to include SDL_main.h but doesn't want the main handing magic,
(maybe to call SDL_RegisterApp()) they can #define SDL_MAIN_HANDLED first
_SDL_MAIN_NOIMPL is for SDL-internal usage (only affects implementation,
not definition of SDL_MAIN_AVAILABLE etc in SDL_main.h) */
#if !defined(SDL_MAIN_HANDLED) && !defined(_SDL_MAIN_NOIMPL)
SDL_MAIN_NOIMPL is for SDL-internal usage (only affects implementation,
not definition of SDL_MAIN_AVAILABLE etc in SDL_main.h) and if the user wants
to have the SDL_main implementation (from this header) in another source file
than their main() function, for example if SDL_main requires C++
and main() is implemented in plain C */
#if !defined(SDL_MAIN_HANDLED) && !defined(SDL_MAIN_NOIMPL)
#if defined(__WIN32__) || defined(__GDK__)
@ -103,6 +106,61 @@ WinMain(HINSTANCE hInst, HINSTANCE hPrev, LPSTR szCmdLine, int sw)
#define main SDL_main
/* end of __WIN32__ and __GDK__ impls */
#elif defined(__WINRT__)
/* WinRT main based on SDL_winrt_main_NonXAML.cpp, placed in the public domain by David Ludwig 3/13/14 */
#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 the .cpp file including SDL_main.h 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
#if !defined(__cplusplus) || !defined(__cplusplus_winrt)
#error The C++ file that includes SDL_main.h must be compiled as C++ code 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);
}
/* end of WinRT impl */
#elif defined(__IOS__) || defined(__TVOS__)
#ifdef main

2
src/SDL_internal.h
View File

@ -181,7 +181,7 @@
#endif
#include <SDL3/SDL.h>
#define _SDL_MAIN_NOIMPL /* don't drag in header-only implementation of SDL_main */
#define SDL_MAIN_NOIMPL /* don't drag in header-only implementation of SDL_main */
#include <SDL3/SDL_main.h>
/* The internal implementations of these functions have up to nanosecond precision.

2
src/dynapi/SDL_dynapi.c
View File

@ -31,7 +31,7 @@
#endif
#include <SDL3/SDL.h>
#define _SDL_MAIN_NOIMPL /* don't drag in header-only implementation of SDL_main */
#define SDL_MAIN_NOIMPL /* don't drag in header-only implementation of SDL_main */
#include <SDL3/SDL_main.h>

55
src/main/winrt/SDL_winrt_main_NonXAML.cpp
View File

@ -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);
}

11
test/main.cpp Normal file
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@ -0,0 +1,11 @@
/*
* This file is supposed to be used to build tests on platforms that require
* the main function to be implemented in C++, which means that SDL_main's
* implementation needs C++ and thus can't be included in test*.c
*
* Placed in the public domain by Daniel Gibson, 2022-12-12
*/
#include <SDL3/SDL_main.h>
// that's all, folks!