break out update

Lesson10.c

@@ -17,7 +17,6 @@
 SDL_Window*   win = NULL;      // Holds Our Window Handle
 SDL_GLContext ctx = NULL;      // Permanent Rendering Context
 
-bool active = true;            // Window Active Flag Set To TRUE By Default
 bool fullscreen = true;        // Fullscreen Flag Set To Fullscreen Mode By Default
 bool blend = false;            // Blending ON/OFF
 
@@ -47,7 +46,7 @@ GLfloat z = 0.0f;           // Depth Into The Screen
 
 GLuint filter;              // Which Filter To Use
 // Storage For 3 Textures
-GLuint texture[3] = { 0, 0, 0};
+GLuint texture[3] = { 0, 0, 0 };
 
 typedef struct tagVERTEX
 {
@@ -480,53 +479,17 @@ void WndProc(SDL_Event *event)
 	}
 }
 
-int main(int argc, char *argv[])
+int Update(void)
 {
-
-	SDL_Init(SDL_INIT_VIDEO);
-
-	// Ask The User Which Screen Mode They Prefer
-	const SDL_MessageBoxData msgbox =
-	{
-		/* flags       */ SDL_MESSAGEBOX_INFORMATION,
-		/* window      */ win,
-		/* title       */ "Start FullScreen?",
-		/* message     */ "Would You Like To Run In Fullscreen Mode?",
-		/* numbuttons  */ 2,
-		/* buttons     */ yesnobttns,
-		/* colorScheme */ NULL
-	};
-	int bttnid = 1;
-	SDL_ShowMessageBox(&msgbox, &bttnid);
-	if (bttnid == 1)
-	{
-		fullscreen = false;                         // Windowed Mode
-	}
-
-	// Create Our OpenGL Window
-	if (!CreateGLWindow("Lionel Brits & NeHe's 3D World Tutorial", 640, 480, 16, fullscreen))
-	{
-		return 0;                                   // Quit If Window Was Not Created
-	}
-
-	while (!done)                                   // Loop That Runs While done=FALSE
-	{
-		SDL_Event event;                            // SDL Event Structure
-		while (SDL_PollEvent(&event) > 0)           // Is There A Message Waiting?
-		{
-			WndProc(&event);                        // Deal with events
-		}
-
 	// Draw The Scene.  Watch Quit Messages From DrawGLScene()
-		if (active && !DrawGLScene())               // Active?
+	if (!DrawGLScene())
 	{
-			done = true;                            // ESC or DrawGLScene Signalled A Quit
-			break;
+		done = true;         // DrawGLScene Signalled A Quit
+		return 1;
 	}
 
 	SDL_GL_SwapWindow(win);  // Swap Buffers (Double Buffering)
 
-
 	// Handle keyboard input
 	const Uint8* keys = SDL_GetKeyboardState(NULL);
 
@@ -592,8 +555,53 @@ int main(int argc, char *argv[])
 	{
 		lookupdown += 1.0f;
 	}
+
+	return 0;
+}
+
+int main(int argc, char *argv[])
+{
+	SDL_Init(SDL_INIT_VIDEO);
+
+	// Ask The User Which Screen Mode They Prefer
+	const SDL_MessageBoxData msgbox =
+	{
+		/* flags       */ SDL_MESSAGEBOX_INFORMATION,
+		/* window      */ win,
+		/* title       */ "Start FullScreen?",
+		/* message     */ "Would You Like To Run In Fullscreen Mode?",
+		/* numbuttons  */ 2,
+		/* buttons     */ yesnobttns,
+		/* colorScheme */ NULL
+	};
+	int bttnid = 1;
+	SDL_ShowMessageBox(&msgbox, &bttnid);
+	if (bttnid == 1)
+	{
+		fullscreen = false;                // Windowed Mode
 	}
 
+	// Create Our OpenGL Window
+	if (!CreateGLWindow("Lionel Brits & NeHe's 3D World Tutorial", 640, 480, 16, fullscreen))
+	{
+		return 0;                          // Quit If Window Was Not Created
+	}
+
+	do
+	{
+		SDL_Event event;                   // SDL Event Structure
+		while (SDL_PollEvent(&event) > 0)  // Is There A Message Waiting?
+		{
+			WndProc(&event);               // Deal with events
+		}
+
+		if (Update())
+		{
+			done = true;
+		}
+	} while (!done);
+
+
 	// Shutdown
 	FreeResources();
 	KillGLWindow();                        // Kill The Window