Framebuffer size getter for gl_window,

and a couple of minor const noexcept changes.

source/simple/graphical/gl_window.cpp

@@ -71,7 +71,7 @@ void gl_window::update() noexcept
 	SDL_GL_SwapWindow(guts().get());
 }
 
-auto gl_window::vsync() -> vsync_mode
+auto gl_window::vsync() const noexcept -> vsync_mode
 {
 	return static_cast<vsync_mode>(SDL_GL_GetSwapInterval());
 }
@@ -82,9 +82,16 @@ void gl_window::require_vsync(vsync_mode mode)
 		SDL_GL_SetSwapInterval(support::to_integer(mode)) );
 }
 
-bool gl_window::request_vsync(vsync_mode mode)
+bool gl_window::request_vsync(vsync_mode mode) noexcept
 {
 	return !sdlcore::utils::check_error(
 		SDL_GL_SetSwapInterval(support::to_integer(mode)) );
 }
 
+int2 gl_window::framebuffer_size() const noexcept
+{
+	int2 size;
+	SDL_GL_GetDrawableSize(guts().get(), &size.x(), &size.y());
+	return size;
+}
+

source/simple/graphical/gl_window.h

@@ -262,10 +262,12 @@ namespace simple::graphical
 
 		void update() noexcept;
 
-		vsync_mode vsync();
-		bool request_vsync(vsync_mode);
+		vsync_mode vsync() const noexcept;
+		bool request_vsync(vsync_mode) noexcept;
 		void require_vsync(vsync_mode);
 
+		int2 framebuffer_size() const noexcept;
+
 	};