Fix undefined fullbright symbols; link with --no-undefined

The fullbright_update/fullbright_invalidate definitions were lost when the
old text-menu section was removed, leaving undefined symbols that made the
dynamic loader reject libhl2hake.so. Restore both definitions and add
-Wl,--no-undefined so missing definitions fail the build instead of the game.

1 files changed, 35 insertions, 0 deletions

diff --git a/src/menu.cpp b/src/menu.cpp
index af1d2b8..e48fee0 100644
--- a/src/menu.cpp
+++ b/src/menu.cpp
@@ -660,6 +660,41 @@ void draw_text_col(int x, int y, const char *text, int r, int g, int b) {
   surf_draw_print_text(wtext, (int)wcslen(wtext));
 }
 
+// ---------------------------------------------------------------------------
+// mat_fullbright
+// ---------------------------------------------------------------------------
+
+static int g_fullbright_applied = -1;
+static bool g_fullbright_fail_logged = false;
+
+void fullbright_invalidate() { g_fullbright_applied = -1; }
+
+void fullbright_update() {
+  bool want = feature_active(FEAT_FULLBRIGHT);
+  if ((int)want == g_fullbright_applied)
+    return;
+  // Avoid touching the engine console before the first map/menu frame. The
+  // engine may still be initializing its command buffer.
+  if (!want && g_fullbright_applied < 0) {
+    g_fullbright_applied = 0;
+    return;
+  }
+  bool ok = cvar_set_int("mat_fullbright", want ? 1 : 0);
+  g_fullbright_applied = want;
+  if (ok) {
+    if (want)
+      logf("fullbright: on");
+    else
+      logd("fullbright: off");
+    return;
+  }
+  if (want && !g_fullbright_fail_logged) {
+    g_fullbright_fail_logged = true;
+    logf("fullbright: mat_fullbright cvar unavailable");
+    toastf(TOAST_ERROR, "Fullbright unavailable: cvar interface missing");
+  }
+}
+
 // Draw overlay. MUST be called from inside the ISurface paint path
 // (see hkdDrawPrintText hook in hl2h.cpp): we wrap our draws in
 // PushMakeCurrent/PopMakeCurrent so they are submitted with a clean clip.