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Toggling Fullscreen & Windowed

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Does anyone have a working example of how to toggle between full screen and windowed modes in OpenGL? I''ve seen things that toggle before really initializing anything using ChangeDisplaySettings(). I figured I should be able to just use that to switch between them normally, but couldn''t get it to work. It seems to make the change successfully, then just shuts down. Actually, I guess this isn''t really even OpenGL code, just windows code. Any help would be appreciated. Thanks! Nate

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hi nate

that''s the code i am using in my game...


  
void SetDisplayMode (int Width, int Height, int BBP, bool Fullscreen, int Frequency)
{
PIXELFORMATDESCRIPTOR pfd = {0};
INT ipf;
DWORD exstyle,style;
RECT r;

if (wndMain)
{
DestroyWindow(wndMain);
wglMakeCurrent(dcMain,0);
wglDeleteContext(rcMain);
}

if (Fullscreen)
{
DEVMODE dm;

memset(&dm,0,sizeof(DEVMODE));

dm.dmSize = sizeof(DEVMODE);
dm.dmPelsWidth = Width;
dm.dmPelsHeight = Height;
dm.dmBitsPerPel = BBP;
dm.dmDisplayFrequency = Frequency;
dm.dmFields = DM_PELSWIDTH | DM_PELSHEIGHT | DM_BITSPERPEL | DM_DISPLAYFREQUENCY;

if (ChangeDisplaySettings(&dm, CDS_FULLSCREEN) != DISP_CHANGE_SUCCESSFUL)
{
MessageBox(0,"Display mode not supported","Error", MB_ICONSTOP);
Fullscreen = false;
}
}

exstyle = Fullscreen ? WS_EX_APPWINDOW : 0;
style = Fullscreen ? WS_POPUP | WS_VISIBLE : WS_OVERLAPPEDWINDOW | WS_VISIBLE | WS_CLIPCHILDREN | WS_CLIPSIBLINGS;

r.left = 0;
r.top = 0;
r.right = Width;
r.bottom = Height;

AdjustWindowRectEx(&r,style,0,exstyle);

wndMain = CreateWindowEx(exstyle,"__glwindow","GLWindow",style,0,0,r.right,r.bottom,0,0,GetModuleHandle(0),0);
dcMain = GetDC(wndMain);

pfd.nSize = sizeof(PIXELFORMATDESCRIPTOR);
pfd.dwFlags = PFD_SUPPORT_OPENGL | PFD_DRAW_TO_WINDOW | PFD_DOUBLEBUFFER;
pfd.iPixelType = PFD_TYPE_RGBA;
pfd.nVersion = 1;

if (BBP == 32)
{
pfd.cDepthBits = 16;
pfd.cColorBits = 32;
pfd.cRedBits = 8;
pfd.cGreenBits = 8;
pfd.cBlueBits = 8;
pfd.cAlphaBits = 8;
}
else if (BBP == 16)
{
pfd.cDepthBits = 16;
pfd.cColorBits = 16;
pfd.cRedBits = 5;
pfd.cGreenBits = 6;
pfd.cBlueBits = 5;
pfd.cAlphaBits = 0;
}

ipf = ChoosePixelFormat(dcMain,&pfd);
SetPixelFormat(dcMain,ipf,&pfd);
rcMain = wglCreateContext(dcMain);
wglMakeCurrent(dcMain,rcMain);

glViewport(0,0,Width,Height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();

gluPerspective(60,(float)Width/(float)Height,0.1,1000);
}

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Does anyone else notice that things slow down considerably in full-screen mode as opposed to partial screen?
Just something that I observed happens in my OpenGL programs.

TommyB

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hmm could be that nasty "vertical retrace" monster. Can you disable it on your video hardware? (On my NVidia card, I can disable it via the display->properties->advanced control panel applet)

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