Fixed typedef redefinition errors when including both SDL_vulkan.h and vulkan.h

You should always include vulkan/vulkan.h first, then include SDL_vulkan.h

include/SDL.h

@@ -40,10 +40,10 @@
 #include "SDL_error.h"
 #include "SDL_events.h"
 #include "SDL_filesystem.h"
-#include "SDL_joystick.h"
 #include "SDL_gamecontroller.h"
 #include "SDL_haptic.h"
 #include "SDL_hints.h"
+#include "SDL_joystick.h"
 #include "SDL_loadso.h"
 #include "SDL_log.h"
 #include "SDL_messagebox.h"
@@ -51,12 +51,12 @@
 #include "SDL_power.h"
 #include "SDL_render.h"
 #include "SDL_rwops.h"
+#include "SDL_shape.h"
 #include "SDL_system.h"
 #include "SDL_thread.h"
 #include "SDL_timer.h"
 #include "SDL_version.h"
 #include "SDL_video.h"
-#include "SDL_vulkan.h"
 
 #include "begin_code.h"
 /* Set up for C function definitions, even when using C++ */

include/SDL_vulkan.h

@@ -1,6 +1,6 @@
 /*
   Simple DirectMedia Layer
- Copyright (C) 2017, Mark Callow.
+  Copyright (C) 2017, Mark Callow
 
   This software is provided 'as-is', without any express or implied
   warranty.  In no event will the authors be held liable for any damages
@@ -36,8 +36,11 @@
 extern "C" {
 #endif
 
-/* Avoid including vulkan.h */
+/* Avoid including vulkan.h, don't define VkInstance if it's already included */
-#ifndef VULKAN_H_
+#ifdef VULKAN_H_
+#define NO_SDL_VULKAN_TYPEDEFS
+#endif
+#ifndef NO_SDL_VULKAN_TYPEDEFS
 #define VK_DEFINE_HANDLE(object) typedef struct object##_T* object;
 
 #if defined(__LP64__) || defined(_WIN64) || defined(__x86_64__) || defined(_M_X64) || defined(__ia64) || defined (_M_IA64) || defined(__aarch64__) || defined(__powerpc64__)
@@ -49,7 +52,7 @@ extern "C" {
 VK_DEFINE_HANDLE(VkInstance)
 VK_DEFINE_NON_DISPATCHABLE_HANDLE(VkSurfaceKHR)
 
-#endif /* !VULKAN_H_ */
+#endif /* !NO_SDL_VULKAN_TYPEDEFS */
 
 typedef VkInstance SDL_vulkanInstance;
 typedef VkSurfaceKHR SDL_vulkanSurface; /* for compatibility with Tizen */

src/dynapi/SDL_dynapi.c

@@ -32,9 +32,9 @@
 
 #include "SDL.h"
 
-/* !!! FIXME: Shouldn't these be included in SDL.h? */
+/* These headers have system specific definitions, so aren't included above */
-#include "SDL_shape.h"
 #include "SDL_syswm.h"
+#include "SDL_vulkan.h"
 
 /* This is the version of the dynamic API. This doesn't match the SDL version
    and should not change until there's been a major revamp in API/ABI.

src/video/SDL_sysvideo.h

@@ -26,7 +26,8 @@
 #include "SDL_messagebox.h"
 #include "SDL_shape.h"
 #include "SDL_thread.h"
-#include "SDL_vulkan.h"
+
+#include "SDL_vulkan_internal.h"
 
 /* The SDL video driver */
 

src/video/SDL_vulkan_internal.h

@@ -18,8 +18,8 @@
      misrepresented as being the original software.
   3. This notice may not be removed or altered from any source distribution.
 */
-#ifndef _SDL_vulkan_internal_h
+#ifndef SDL_vulkan_internal_h_
-#define _SDL_vulkan_internal_h
+#define SDL_vulkan_internal_h_
 
 #include "../SDL_internal.h"
 
@@ -53,14 +53,13 @@
 #define VK_USE_PLATFORM_XCB_KHR
 #endif
 
-#if SDL_VIDEO_VULKAN_SURFACE
-
-/* Need vulkan.h for the following declarations. Must ensure the first
- * inclusion of vulkan has the appropriate USE_PLATFORM defined, hence
- * the above. */
 #define VK_NO_PROTOTYPES
 #include "./khronos/vulkan/vulkan.h"
 
+#include "SDL_vulkan.h"
+
+#if SDL_VIDEO_VULKAN_SURFACE
+
 extern const char *SDL_Vulkan_GetResultString(VkResult result);
 
 extern VkExtensionProperties *SDL_Vulkan_CreateInstanceExtensionsList(
@@ -73,8 +72,8 @@ extern SDL_bool SDL_Vulkan_GetInstanceExtensions_Helper(unsigned *userCount,
                                                         const char **userNames,
                                                         unsigned nameCount,
                                                         const char *const *names);
+#endif /* SDL_VIDEO_VULKAN_SURFACE */
 
-#endif
+#endif /* SDL_vulkan_internal_h_ */
 
-#endif
 /* vi: set ts=4 sw=4 expandtab: */

test/testvulkan.c

@@ -33,6 +33,7 @@ int main(int argc, char *argv[])
 /* SDL includes a copy for building on systems without the Vulkan SDK */
 #include "../src/video/khronos/vulkan/vulkan.h"
 #endif
+#include "SDL_vulkan.h"
 
 #ifndef UINT64_MAX /* VS2008 */
 #define UINT64_MAX 18446744073709551615