add SDL_ContextNotSupported and validate flags in SDL_RecreateWindow similar to SDL_CreateWindow

src/video/SDL_video.c

@@ -1579,6 +1579,14 @@ SDL_FinishWindowCreation(SDL_Window *window, Uint32 flags)
     }
 }
 
+static int
+SDL_ContextNotSupported(const char *name)
+{
+    return SDL_SetError("%s support is either not configured in SDL "
+                 "or not available in current SDL video driver "
+                 "(%s) or platform", name, _this->name);
+}
+
 SDL_Window *
 SDL_CreateWindow(const char *title, int x, int y, int w, int h, Uint32 flags)
 {
@@ -1627,9 +1635,7 @@ SDL_CreateWindow(const char *title, int x, int y, int w, int h, Uint32 flags)
 
     if (flags & SDL_WINDOW_OPENGL) {
         if (!_this->GL_CreateContext) {
-            SDL_SetError("OpenGL support is either not configured in SDL "
-                         "or not available in current SDL video driver "
-                         "(%s) or platform", _this->name);
+            SDL_ContextNotSupported("OpenGL");
             return NULL;
         }
         if (SDL_GL_LoadLibrary(NULL) < 0) {
@@ -1639,9 +1645,7 @@ SDL_CreateWindow(const char *title, int x, int y, int w, int h, Uint32 flags)
 
     if (flags & SDL_WINDOW_VULKAN) {
         if (!_this->Vulkan_CreateSurface) {
-            SDL_SetError("Vulkan support is either not configured in SDL "
-                         "or not available in current SDL video driver "
-                         "(%s) or platform", _this->name);
+            SDL_ContextNotSupported("Vulkan");
             return NULL;
         }
         if (graphics_flags & SDL_WINDOW_OPENGL) {
@@ -1655,9 +1659,7 @@ SDL_CreateWindow(const char *title, int x, int y, int w, int h, Uint32 flags)
 
     if (flags & SDL_WINDOW_METAL) {
         if (!_this->Metal_CreateView) {
-            SDL_SetError("Metal support is either not configured in SDL "
-                         "or not available in current SDL video driver "
-                         "(%s) or platform", _this->name);
+            SDL_ContextNotSupported("Metal");
             return NULL;
         }
         /* 'flags' may have default flags appended, don't check against that. */
@@ -1809,9 +1811,7 @@ SDL_CreateWindowFrom(const void *data)
 
     if (SDL_GetHintBoolean(SDL_HINT_VIDEO_FOREIGN_WINDOW_OPENGL, SDL_FALSE)) {
         if (!_this->GL_CreateContext) {
-            SDL_SetError("OpenGL support is either not configured in SDL "
-                         "or not available in current SDL video driver "
-                         "(%s) or platform", _this->name);
+            SDL_ContextNotSupported("OpenGL");
             return NULL;
         }
         if (SDL_GL_LoadLibrary(NULL) < 0) {
@@ -1822,9 +1822,7 @@ SDL_CreateWindowFrom(const void *data)
 
     if (SDL_GetHintBoolean(SDL_HINT_VIDEO_FOREIGN_WINDOW_VULKAN, SDL_FALSE)) {
         if (!_this->Vulkan_CreateSurface) {
-            SDL_SetError("Vulkan support is either not configured in SDL "
-                         "or not available in current SDL video driver "
-                         "(%s) or platform", _this->name);
+            SDL_ContextNotSupported("Vulkan");
             return NULL;
         }
         if (flags & SDL_WINDOW_OPENGL) {
@@ -1877,9 +1875,13 @@ SDL_RecreateWindow(SDL_Window * window, Uint32 flags)
     SDL_bool need_vulkan_load = SDL_FALSE;
 
     if ((flags & SDL_WINDOW_OPENGL) && !_this->GL_CreateContext) {
-        return SDL_SetError("OpenGL support is either not configured in SDL "
-                            "or not available in current SDL video driver "
-                            "(%s) or platform", _this->name);
+        return SDL_ContextNotSupported("OpenGL");
+    }
+    if ((flags & SDL_WINDOW_VULKAN) && !_this->Vulkan_CreateSurface) {
+        return SDL_ContextNotSupported("Vulkan");
+    }
+    if ((flags & SDL_WINDOW_METAL) && !_this->Metal_CreateView) {
+        return SDL_ContextNotSupported("Metal");
     }
 
     if (window->flags & SDL_WINDOW_FOREIGN) {
@@ -4753,9 +4755,7 @@ int SDL_Vulkan_LoadLibrary(const char *path)
         retval = 0;
     } else {
         if (!_this->Vulkan_LoadLibrary) {
-            return SDL_SetError("Vulkan support is either not configured in SDL "
-                                "or not available in current SDL video driver "
-                                "(%s) or platform", _this->name);
+            return SDL_ContextNotSupported("Vulkan");
         }
         retval = _this->Vulkan_LoadLibrary(_this, path);
     }