c++ - Changing resolution in OpenGL doesn't change the actual size of textures drawn -


i have opengl application using sdl, , i'm experiencing strange behavior when resizing window. example, here normal looking window @ 1400x900: normal resolution

if increase resolution 1600x900, black bars screen size being same: higher resolution

if reduce resolution 1280x1024, part of image: lower resolution

however, if exit application , restart manually, application behaves normal image being drawn @ correct size. numbers here examples, problem remains no matter initial , final resolutions.

void app :: load() {     int music = 100, effects = 100;      xmldoc settings("res/settings.xml");     if(settings.ready())     {         rapidxml::xml_node<char> *node = settings.doc()->first_node("settings");         if(nodevalid(node))         {             if(nodevalid("screen",node))                 gscreensettings.load(node->first_node("screen"));              if(nodevalid("volume",node))             {                 rapidxml::xml_node<char> *volnode = node->first_node("volume");                 loadnum(music,"music",volnode);                 loadnum(effects,"effects",volnode);             }              gfilepath.load(node->first_node("paths"));         }     }      //start sound subsystem     pyrodactyl::music::gmusicmanager.init(music, effects); }  bool app :: init(bool load) {     //load sdl subsystems , truetype font subsystem     if( sdl_init( sdl_init_timer | sdl_init_audio | sdl_init_video | sdl_init_joystick ) == -1 || ttf_init() == -1)     {         fprintf(stderr,"couldn't initialize sdl :(");         return false;     }      if(load)         load();      //set window caption     sdl_wm_setcaption("unrest", "unrest");      //set window icon     sdl_surface *iconimage = sdl_loadbmp(gfilepath.icon.c_str());     uint32 colorkey = sdl_maprgb(iconimage->format, 255, 0, 255);     sdl_setcolorkey(iconimage, sdl_srccolorkey, colorkey);     sdl_wm_seticon(iconimage,null);      //initialize music thread     if(music == null)         music = sdl_createthread(musicthread, null);      sdl_gl_setattribute(sdl_gl_doublebuffer, 1);     sdl_gl_setattribute(sdl_gl_stencil_size,4);     sdl_gl_setattribute(sdl_gl_accelerated_visual,1);      //set keyboard repeat rate     sdl_enablekeyrepeat(sdl_default_repeat_delay/4, sdl_default_repeat_interval);      //store default desktop values before starting our own screen     gscreensettings.desktop.w = sdl_getvideoinfo()->current_w;     gscreensettings.desktop.h = sdl_getvideoinfo()->current_h;      //set screen     screen = sdl_setvideomode(gscreensettings.cur.w, gscreensettings.cur.h, gscreensettings.bpp, gscreensettings.videoflags);     if(screen == null)         return false;      // initialize glew     glenum status = glewinit();     if (status != glew_no_error)     {         fprintf(stderr, "failed initialize glew %d: %s\n", status, glewgeterrorstring(status));         return false;     }      //initialize , load input     pyrodactyl::input::ginput.init();     pyrodactyl::input::ginput.load(gfilepath.controls);      //enable 2d textures     glenable(gl_texture_2d);     glenable(gl_arb_texture_non_power_of_two);      //enable transparency in textures, set blend function     glenable(gl_blend);     glblendfunc(gl_src_alpha,gl_one_minus_src_alpha);      glstencilop(gl_keep,gl_replace,gl_replace);      glclearcolor(0.0f, 0.0f, 0.0f, 0.0f);     glclearstencil(0);      glclear(gl_color_buffer_bit | gl_stencil_buffer_bit);      glmatrixmode(gl_projection);     glloadidentity();      glortho(0.0f, gscreensettings.cur.w, gscreensettings.cur.h, 0.0f, -1.0f, 1.0f);      glmatrixmode(gl_modelview);     glloadidentity();      glenableclientstate(gl_vertex_array);     glenableclientstate(gl_texture_coord_array);      //disable sdl stock cursor     sdl_showcursor(sdl_disable);      //enable unicode text input in text area     sdl_enableunicode( sdl_enable );      //seed random function     srand(static_cast<unsigned int>(time(null)));      //apply vsync settings     gscreensettings.vsync();      return true; }  void app :: reset(bool load) {     using namespace pyrodactyl::image;      //delete stuff     gimagemanager.quit();     pyrodactyl::text::gtextmanager.reset();     gloadscreen.quit();      //reload stuff     init(load);     gloadscreen.load();     gimagemanager.init();     gimagemanager.tileset.reload(); }

the reset() function called whenever need change resolution. please me solve problem.

my guess need glviewport in reset function.


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