Hello I haven't any bug but the text doesn't appear when running the programm. #include <SDL/SDL.h> #include <windows.h> // Header File For Windows #include <math.h> // Header File For Windows Math Library ( ADD ) #include <stdio.h> // Header File For Standard Input/Output ( ADD ) #include <stdarg.h> // Header File For Variable Argument Routines ( ADD ) #include <gl\gl.h> // Header File For The OpenGL32 Library #include <gl\glu.h> // Header File For The GLu32 Library //#include <gl\glaux.h> // Header File For The GLaux Library HDC hDC=NULL; // Private GDI Device Context HGLRC hRC=NULL; // Permanent Rendering Context HWND hWnd=NULL; // Holds Our Window Handle HINSTANCE hInstance; // Holds The Instance Of The Application GLuint base; // Base Display List For The Font Set GLfloat cnt1; // 1st Counter Used To Move Text & For Coloring GLfloat cnt2; // 2nd Counter Used To Move Text & For Coloring bool keys[256]; // Array Used For The Keyboard Routine bool active=TRUE; // Window Active Flag Set To TRUE By Default bool fullscreen=TRUE; // Fullscreen Flag Set To Fullscreen Mode By Default LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM); // Declaration For WndProc GLvoid BuildFont(GLvoid) // Build Our Bitmap Font { HFONT font; // Windows Font ID HFONT oldfont; // Used For Good House Keeping base = glGenLists(96); // Storage For 96 Characters ( NEW ) font = CreateFont(-24, // Height Of Font ( NEW ) 0, // Width Of Font 0, // Angle Of Escapement 0, // Orientation Angle FW_BOLD, // Font Weight FALSE, // Italic FALSE, // Underline FALSE, // Strikeout ANSI_CHARSET, // Character Set Identifier OUT_TT_PRECIS, // Output Precision CLIP_DEFAULT_PRECIS, // Clipping Precision ANTIALIASED_QUALITY, // Output Quality FF_DONTCARE|DEFAULT_PITCH, // Family And Pitch "Courier New"); // Font Name oldfont = (HFONT)SelectObject(hDC, font); // Selects The Font We Want wglUseFontBitmaps(hDC, 32, 96, base); // Builds 96 Characters Starting At Character 32 SelectObject(hDC, oldfont); // Selects The Font We Want DeleteObject(font); // Delete The Font } GLvoid KillFont(GLvoid) // Delete The Font List { glDeleteLists(base, 96); // Delete All 96 Characters ( NEW ) } GLvoid glPrint(const char *fmt, ...) // Custom GL "Print" Routine { char text[256]; // Holds Our String va_list ap; // Pointer To List Of Arguments if (fmt == NULL) // If There's No Text return; // Do Nothing va_start(ap, fmt); // Parses The String For Variables vsprintf(text, fmt, ap); // And Converts Symbols To Actual Numbers va_end(ap); // Results Are Stored In Text glPushAttrib(GL_LIST_BIT); // Pushes The Display List Bits ( NEW ) glListBase(base - 32); // Sets The Base Character to 32 ( NEW ) glCallLists(strlen(text), GL_UNSIGNED_BYTE, text); // Draws The Display List Text ( NEW ) glPopAttrib(); // Pops The Display List Bits ( NEW ) } int InitGL(GLvoid) // All Setup For OpenGL Goes Here { glShadeModel(GL_SMOOTH); // Enable Smooth Shading glClearColor(0.0f, 0.0f, 0.0f, 0.5f); // Black Background glClearDepth(1.0f); // Depth Buffer Setup glEnable(GL_DEPTH_TEST); // Enables Depth Testing glDepthFunc(GL_LEQUAL); // The Type Of Depth Testing To Do glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST); // Really Nice Perspective Calculations BuildFont(); // Build The Font return TRUE; // Initialization Went OK } int DrawGLScene(GLvoid) // Here's Where We Do All The Drawing { glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear The Screen And The Depth Buffer glLoadIdentity(); // Reset The View glTranslatef(0.0f,0.0f,-1.0f); // Move One Unit Into The Screen glColor3f(1.0f*float(cos(cnt1)),1.0f*float(sin(cnt2)),1.0f-0.5f*float(cos(cnt1+cnt2))); glRasterPos2f(-0.45f+0.05f*float(cos(cnt1)), 0.35f*float(sin(cnt2))); glPrint("Active OpenGL Text With NeHe"); // Print GL Text To The Screen cnt1+=0.051f; // Increase The First Counter cnt2+=0.005f; // Increase The Second Counter glFlush(); SDL_GL_SwapBuffers(); return TRUE; // Everything Went OK } int main(int argc, char *argv[]) { int width = 640; int height = 480; SDL_Init(SDL_INIT_VIDEO); SDL_Surface* ecran = SDL_SetVideoMode(640, 480, 32, SDL_OPENGL); int continuer = 1; //initialisation /* glMatrixMode( GL_PROJECTION ); glLoadIdentity(); gluPerspective(70,(double)640/480,1,1000);*/ if (height==0) // Prevent A Divide By Zero By { height=1; // Making Height Equal One } glViewport(0,0,width,height); // Reset The Current Viewport glMatrixMode(GL_PROJECTION); // Select The Projection Matrix glLoadIdentity(); // Reset The Projection Matrix // Calculate The Aspect Ratio Of The Window gluPerspective(45.0f,(GLfloat)width/(GLfloat)height,0.1f,100.0f); glMatrixMode(GL_MODELVIEW); // Select The Modelview Matrix glLoadIdentity(); SDL_Event event; InitGL(); while (continuer) { while(SDL_PollEvent(&event)) { switch(event.type) { case SDL_QUIT: continuer=0; break; case SDL_KEYUP: switch (event.key.keysym.sym) { case SDLK_ESCAPE: continuer=0; break; case SDLK_RETURN: break; default : break; } break; } } DrawGLScene(); } if (!UnregisterClass("OpenGL",hInstance)) // Are We Able To Unregister Class { //MessageBox(NULL,"Could Not Unregister Class.","SHUTDOWN ERROR",MB_OK | MB_ICONINFORMATION); hInstance=NULL; // Set hInstance To NULL } KillFont(); // Destroy The Font SDL_FreeSurface(ecran); SDL_Quit(); return 0; } I use SDL and Windows.