Prepare for CPU rendering

cycfi · Mar 22, 2024 · 63ab10a · 63ab10a
1 parent 58024d0
commit 63ab10a
Showing 1 changed file with 19 additions and 11 deletions.
diff --git a/examples/host/linux/skia_app.cpp b/examples/host/linux/skia_app.cpp
@@ -43,14 +43,13 @@ namespace
 
    void realize(GtkGLArea* area, gpointer user_data)
    {
-      gtk_gl_area_make_current (area);
-      if (gtk_gl_area_get_error (area) != NULL)
+      gtk_gl_area_make_current(area);
+      if (gtk_gl_area_get_error(area) != NULL)
          return;
 
       view_state& state = *reinterpret_cast<view_state*>(user_data);
       glClearColor(state._bkd.red, state._bkd.green, state._bkd.blue, state._bkd.alpha);
       glClear(GL_COLOR_BUFFER_BIT);
-      state._xface = GrGLMakeNativeInterface();
       state._ctx = GrDirectContext::MakeGL(state._xface);
    }
 
@@ -127,21 +126,30 @@ namespace
 
       g_signal_connect(window, "destroy", G_CALLBACK(close_window), user_data);
 
-      // create a GtkGLArea instance
-      auto* gl_area = gtk_gl_area_new();
-      gtk_container_add(GTK_CONTAINER(window), gl_area);
-
-      g_signal_connect(gl_area, "render", G_CALLBACK(render), user_data);
-      g_signal_connect(gl_area, "realize", G_CALLBACK(realize), user_data);
+      GtkWidget* widget = nullptr;
+      if (state._xface = GrGLMakeNativeInterface(); state._xface != nullptr)
+      {
+         // create a GtkGLArea instance
+         GtkWidget* gl_area = gtk_gl_area_new();
+         widget = gl_area;
+         gtk_container_add(GTK_CONTAINER(window), gl_area);
+
+         g_signal_connect(gl_area, "render", G_CALLBACK(render), user_data);
+         g_signal_connect(gl_area, "realize", G_CALLBACK(realize), user_data);
+      }
+      else
+      {
+         // GPU rendering not available
+      }
 
       gtk_window_resize(GTK_WINDOW(window), state._size.x, state._size.y);
       gtk_widget_show_all(window);
 
       auto w = gtk_widget_get_window(GTK_WIDGET(window));
       state._scale = gdk_window_get_scale_factor(w);
 
-      if (state._animate)
-         state._timer_id = g_timeout_add(1000 / 60, animate, gl_area);
+      if (widget && state._animate)
+         state._timer_id = g_timeout_add(1000 / 60, animate, widget);
    }
 }