menu/application: add possibility to query if ogl thread

opengl calls should only executed in the thread, that created the
opengl context. To query whether the current thread is the opengl
thread, the application class stores the current thread id of the
opengl thread after initializing opengl.

1 files changed, 8 insertions, 0 deletions

diff --git a/src/menu/application.cpp b/src/menu/application.cpp
index 1e82b6e2..b8392802 100644
--- a/src/menu/application.cpp
+++ b/src/menu/application.cpp
@@ -80,6 +80,11 @@ namespace usdx
 		return get_instance()->config;
 	}
 
+	bool Application::is_gl_thread(void)
+	{
+		return boost::this_thread::get_id() == get_instance()->gl_thread;
+	}
+
 	void Application::main_loop(SDL_Surface* display)
 	{
 		SDL_Event event;
@@ -157,6 +162,9 @@ namespace usdx
 
 			glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
 			glClear(GL_COLOR_BUFFER_BIT);
+			// save current thread, to be able to detect whether some method is
+			// called from the thread owning the OpenGL contect
+			gl_thread = boost::this_thread::get_id();
 
 			glMatrixMode(GL_PROJECTION);
 			glLoadIdentity();