libs/SDL2/i686-w64-mingw32/include/SDL2/SDL_error.h

 /*
   Simple DirectMedia Layer
-  Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
+  Copyright (C) 1997-2022 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
@@ -37,9 +37,96 @@ extern "C" {
 #endif
 
 /* Public functions */
-/* SDL_SetError() unconditionally returns -1. */
+
+
+/**
+ * Set the SDL error message for the current thread.
+ *
+ * Calling this function will replace any previous error message that was set.
+ *
+ * This function always returns -1, since SDL frequently uses -1 to signify an
+ * failing result, leading to this idiom:
+ *
+ * ```c
+ * if (error_code) {
+ *     return SDL_SetError("This operation has failed: %d", error_code);
+ * }
+ * ```
+ *
+ * \param fmt a printf()-style message format string
+ * \param ... additional parameters matching % tokens in the `fmt` string, if
+ *            any
+ * \returns always -1.
+ *
+ * \since This function is available since SDL 2.0.0.
+ *
+ * \sa SDL_ClearError
+ * \sa SDL_GetError
+ */
 extern DECLSPEC int SDLCALL SDL_SetError(SDL_PRINTF_FORMAT_STRING const char *fmt, ...) SDL_PRINTF_VARARG_FUNC(1);
+
+/**
+ * Retrieve a message about the last error that occurred on the current
+ * thread.
+ *
+ * It is possible for multiple errors to occur before calling SDL_GetError().
+ * Only the last error is returned.
+ *
+ * The message is only applicable when an SDL function has signaled an error.
+ * You must check the return values of SDL function calls to determine when to
+ * appropriately call SDL_GetError(). You should *not* use the results of
+ * SDL_GetError() to decide if an error has occurred! Sometimes SDL will set
+ * an error string even when reporting success.
+ *
+ * SDL will *not* clear the error string for successful API calls. You *must*
+ * check return values for failure cases before you can assume the error
+ * string applies.
+ *
+ * Error strings are set per-thread, so an error set in a different thread
+ * will not interfere with the current thread's operation.
+ *
+ * The returned string is internally allocated and must not be freed by the
+ * application.
+ *
+ * \returns a message with information about the specific error that occurred,
+ *          or an empty string if there hasn't been an error message set since
+ *          the last call to SDL_ClearError(). The message is only applicable
+ *          when an SDL function has signaled an error. You must check the
+ *          return values of SDL function calls to determine when to
+ *          appropriately call SDL_GetError().
+ *
+ * \since This function is available since SDL 2.0.0.
+ *
+ * \sa SDL_ClearError
+ * \sa SDL_SetError
+ */
 extern DECLSPEC const char *SDLCALL SDL_GetError(void);
+
+/**
+ * Get the last error message that was set for the current thread.
+ *
+ * This allows the caller to copy the error string into a provided buffer, but
+ * otherwise operates exactly the same as SDL_GetError().
+ *
+ * \param errstr A buffer to fill with the last error message that was set for
+ *               the current thread
+ * \param maxlen The size of the buffer pointed to by the errstr parameter
+ * \returns the pointer passed in as the `errstr` parameter.
+ *
+ * \since This function is available since SDL 2.0.14.
+ *
+ * \sa SDL_GetError
+ */
+extern DECLSPEC char * SDLCALL SDL_GetErrorMsg(char *errstr, int maxlen);
+
+/**
+ * Clear any previous error message for this thread.
+ *
+ * \since This function is available since SDL 2.0.0.
+ *
+ * \sa SDL_GetError
+ * \sa SDL_SetError
+ */
 extern DECLSPEC void SDLCALL SDL_ClearError(void);
 
 /**

libs/SDL2/i686-w64-mingw32/include/SDL2/SDL_gesture.h

 /*
   Simple DirectMedia Layer
-  Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org>
+  Copyright (C) 1997-2022 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
@@ -46,36 +46,66 @@ typedef Sint64 SDL_GestureID;
 /* Function prototypes */
 
 /**
- *  \brief Begin Recording a gesture on the specified touch, or all touches (-1)
+ * Begin recording a gesture on a specified touch device or all touch devices.
  *
+ * If the parameter `touchId` is -1 (i.e., all devices), this function will
+ * always return 1, regardless of whether there actually are any devices.
  *
+ * \param touchId the touch device id, or -1 for all touch devices
+ * \returns 1 on success or 0 if the specified device could not be found.
+ *
+ * \since This function is available since SDL 2.0.0.
+ *
+ * \sa SDL_GetTouchDevice
  */
 extern DECLSPEC int SDLCALL SDL_RecordGesture(SDL_TouchID touchId);
 
 
 /**
- *  \brief Save all currently loaded Dollar Gesture templates
+ * Save all currently loaded Dollar Gesture templates.
+ *
+ * \param dst a SDL_RWops to save to
+ * \returns the number of saved templates on success or 0 on failure; call
+ *          SDL_GetError() for more information.
  *
+ * \since This function is available since SDL 2.0.0.
  *
+ * \sa SDL_LoadDollarTemplates
+ * \sa SDL_SaveDollarTemplate
  */
 extern DECLSPEC int SDLCALL SDL_SaveAllDollarTemplates(SDL_RWops *dst);
 
 /**
- *  \brief Save a currently loaded Dollar Gesture template
+ * Save a currently loaded Dollar Gesture template.
  *
+ * \param gestureId a gesture id
+ * \param dst a SDL_RWops to save to
+ * \returns 1 on success or 0 on failure; call SDL_GetError() for more
+ *          information.
  *
+ * \since This function is available since SDL 2.0.0.
+ *
+ * \sa SDL_LoadDollarTemplates
+ * \sa SDL_SaveAllDollarTemplates
  */
 extern DECLSPEC int SDLCALL SDL_SaveDollarTemplate(SDL_GestureID gestureId,SDL_RWops *dst);
 
 
 /**
- *  \brief Load Dollar Gesture templates from a file
+ * Load Dollar Gesture templates from a file.
+ *
+ * \param touchId a touch id
+ * \param src a SDL_RWops to load from
+ * \returns the number of loaded templates on success or a negative error code
+ *          (or 0) on failure; call SDL_GetError() for more information.
  *
+ * \since This function is available since SDL 2.0.0.
  *
+ * \sa SDL_SaveAllDollarTemplates
+ * \sa SDL_SaveDollarTemplate
  */
 extern DECLSPEC int SDLCALL SDL_LoadDollarTemplates(SDL_TouchID touchId, SDL_RWops *src);
 
-
 /* Ends C function definitions when using C++ */
 #ifdef __cplusplus
 }