Examples: SDL3: Updated for latest WIP SDL3 branch. (#6243)

docs/CHANGELOG.txt

@@ -40,6 +40,7 @@ Breaking Changes:
 Other changes:
 
 - Backends: OpenGL3: Fixed GL loader crash when GL_VERSION returns NULL. (#6154, #4445, #3530)
+- Examples: SDL3: Updated for latest WIP SDL3 branch. (#6243)
 
 
 -----------------------------------------------------------------------

examples/example_sdl3_opengl3/main.cpp

@@ -25,7 +25,7 @@ int main(int, char**)
     // Setup SDL
     if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_TIMER | SDL_INIT_GAMEPAD) != 0)
     {
-        printf("Error: %s\n", SDL_GetError());
+        printf("Error: SDL_Init(): %s\n", SDL_GetError());
         return -1;
     }
 
@@ -60,11 +60,18 @@ int main(int, char**)
     SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
     SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 24);
     SDL_GL_SetAttribute(SDL_GL_STENCIL_SIZE, 8);
-    SDL_WindowFlags window_flags = (SDL_WindowFlags)(SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE);
-    SDL_Window* window = SDL_CreateWindow("Dear ImGui SDL3+OpenGL3 example", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 1280, 720, window_flags);
+    SDL_WindowFlags window_flags = (SDL_WindowFlags)(SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE | SDL_WINDOW_HIDDEN);
+    SDL_Window* window = SDL_CreateWindow("Dear ImGui SDL3+OpenGL3 example", 1280, 720, window_flags);
+    if (window == NULL)
+    {
+        printf("Error: SDL_CreateWindow(): %s\n", SDL_GetError());
+        return -1;
+    }
+    SDL_SetWindowPosition(window, SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED);
     SDL_GLContext gl_context = SDL_GL_CreateContext(window);
     SDL_GL_MakeCurrent(window, gl_context);
     SDL_GL_SetSwapInterval(1); // Enable vsync
+    SDL_ShowWindow(window);
 
     // Setup Dear ImGui context
     IMGUI_CHECKVERSION();