Drop the app state struct from the hello example

hello only tracked a failure flag, so keep it as a file-scope static like
simple_window and leave yasl_app_desc.userdata unset.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

2 files changed, 10 insertions, 14 deletions

diff --git a/examples/hello.c b/examples/hello.c
index ded4235..1761e04 100644
--- a/examples/hello.c
+++ b/examples/hello.c
@@ -3,17 +3,16 @@
 
 #include <stdio.h>
 
-struct app {
-    bool failed;
-};
+static bool failed;
 
 static enum yasl_app_result init(void *ud, struct yasl_display *display)
 {
+    (void)ud;
     struct yasl_window_spec spec = {.title = "Hello YASL", .size = {640, 480}};
     struct yasl_surface *surface = yasl_surface_create_toplevel(display, &spec);
     if (!surface) {
         perror("yasl_surface_create_toplevel");
-        ((struct app *)ud)->failed = true;
+        failed = true;
         return YASL_APP_QUIT;
     }
     yasl_surface_request_frame(surface);
@@ -28,29 +27,27 @@ static enum yasl_app_result event(void *ud, const struct yasl_event *event)
 
 static void draw(void *ud, struct yasl_surface *surface, struct yasl_frame_context *frame)
 {
-    struct app *app = ud;
+    (void)ud;
     size_t count = (size_t)frame->size.x * frame->size.y;
     for (size_t i = 0; i < count; i++)
         frame->cpu.pixels[i] = 0xff306090; /* Opaque premultiplied ARGB. */
 
     if (!yasl_frame_present_cpu(frame, NULL, 0)) {
         fprintf(stderr, "Could not present the draw target\n");
-        app->failed = true;
+        failed = true;
     }
-    if (app->failed) yasl_surface_destroy(surface);
+    if (failed) yasl_surface_destroy(surface);
 }
 
 int main(void)
 {
-    struct app app = {0};
     struct yasl_app_desc desc = {
         .app_id = "org.example.hello",
-        .userdata = &app,
         .init = init,
         .event = event,
         .frame = draw,
     };
     int result = yasl_run(&desc);
     if (result) fprintf(stderr, "Could not run the application\n");
-    return result || app.failed ? 1 : 0;
+    return result || failed ? 1 : 0;
 }
diff --git a/tests/common/test_hello_example.c b/tests/common/test_hello_example.c
index 6e0318f..7faa147 100644
--- a/tests/common/test_hello_example.c
+++ b/tests/common/test_hello_example.c
@@ -6,15 +6,14 @@
 static void draw_once(void *ud, struct yasl_surface *surface, struct yasl_frame_context *frame)
 {
     draw(ud, surface, frame);
-    if (!((struct app *)ud)->failed) yasl_surface_destroy(surface);
+    if (!failed) yasl_surface_destroy(surface);
 }
 
 int main(void)
 {
-    struct app app = {0};
     struct yasl_app_desc desc = {
-        .app_id = "org.yasl.test.hello", .userdata = &app,
+        .app_id = "org.yasl.test.hello",
         .init = init, .event = event, .frame = draw_once,
     };
-    return yasl_run(&desc) || app.failed ? 1 : 0;
+    return yasl_run(&desc) || failed ? 1 : 0;
 }