AllegroGL can't display fullscreen

AllegroGL can't display fullscreen

d d

Member #6,768

January 2006

I can't get AllegroGL to display something on fullscreen mode. My code works fine in windowed mode but when I try fullscreen my program works but nothing comes on my screen it justs goes to off-mode (the screen). When I press a button for readkey(); it jumps back on and displays the desktop. I could use some help on this.

casey d

Member #4,901

August 2004

If you're running Windows the problem is probably an outdated version of Direct X.

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Tobias Dammers

Member #2,604

August 2002

Errr... he's using AllegroGL, which implies OpenGL, not DirectX. Still, there's probably a driver issue there, or the graphics card simply can't handle fullscreen in that particular color mode (though that sounds unlikely to me).
Do the allegrogl examples work correctly? Have you tried different color or z-buffer depths? Screen resolutions? At the very least, 640*480 at 16bpp with either 8bit or 16bit z-buffer should work.

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miran

Member #2,407

June 2002

Try forcing a screen refresh rate you know works at your selected resolution and colour depth. Should be in your gfx card driver settings somewhere...

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d d

Member #6,768

January 2006

It's probably something on my own machine since the program runs fine on my other (much older) PC in fullscreen mode. I've tried a whole bunch of resolutions but they all failed in fullscreen. I'm gonna download the latest nvidia geforce drivers and try again later. If that doesn't work then I don't know what the problem is. Here's my setgfx function:

1bool SGE_SetGFXMode()
2{
  // clear settings
  allegro_gl_clear_settings();
  
  // set window title
  set_window_title(SGE_VERSIONSTR);
  
  // suggest screen mode for opengl
  allegro_gl_set(AGL_DOUBLEBUFFER, TRUE);                      
  allegro_gl_set(AGL_FULLSCREEN, TRUE);
  allegro_gl_set(AGL_COLOR_DEPTH, 16);                          
  allegro_gl_set(AGL_Z_DEPTH, 8);                                  
  allegro_gl_set(AGL_RENDERMETHOD, TRUE);                        // Hardware acceleration
  allegro_gl_set(AGL_SUGGEST, AGL_DOUBLEBUFFER | AGL_FULLSCREEN | AGL_COLOR_DEPTH | AGL_Z_DEPTH | AGL_RENDERMETHOD);
16 
  // set graphics mode
  if(set_gfx_mode(GFX_OPENGL, 640, 480, 0, 0) < 0){
      allegro_message("Error setting OpenGL graphics mode:\n%s\nAllegro GL error : %s\n", allegro_error, allegro_gl_error);
      return false;
  }
22 
  // opengl enablers
  //glEnable(GL_CULL_FACE);
  glEnable(GL_TEXTURE_2D);                                                    // textures
  //glEnable(GL_DEPTH_TEST);                                                    // zbuffering
  glEnable(GL_BLEND); 
  //glCullFace(GL_BACK);                                                        // don't draw polygons we can't see
  glShadeModel(GL_SMOOTH);                                                    // smooth shading                                                        // blending
  glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);                          // set to alpha blending

// show models
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();

  // clear to black (red,green,blue,alpha)
  glClearColor(0.0,0.0,0.0,0.0);

return true;
40}

My computer is a AMD64 3200+, 512MB DDR, GeForce Ti 4600, running in WinXP at res 1024x768x32x85 (width,height,cdepth,refreshrate).

casey d

Member #4,901

August 2004

Quote:

Errr... he's using AllegroGL, which implies OpenGL, not DirectX.

Haha, yeah, I just realized that. I did in fact miss the GL at the end. Still not as bad and when I confused vector art with pixel art.

I can't even run AllegroGL programs myself unless I compile them with Allegro 4.0.3 AND MSVC. Any later version of Allegro causes the window to be blank and MinGW cause the program to crash. A standard OpenGL application compiled in MinGW however works just fine. I personally think there's some serious compatibility problems going on but since nobody else is complaining I guess that's my problem.

Maybe you should try compiling a standard OpenGL program in fullscreen and see if that works.

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Milan Mimica

Member #3,877

September 2003

casey d & d d: which version of AllegroGL are you using?

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casey d

Member #4,901

August 2004

0.2.4

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Milan Mimica

Member #3,877

September 2003

old, use cvs, or at least one from http://retrospec.sgn.net/allegro.php

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M.M.
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Evert

Member #794

November 2000

As said, you need a more recent version of AllegroGL than 0.2.4 for Allegro 4.2.

casey d

Member #4,901

August 2004

The version on Retrospec gives me the same problem, and I can't login to the CVS repository. Could somebody please upload a recent snapshot?

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Nightsticks, water cannons, tear gas, padlocks, molotov cocktails and rocks behind every curtain