Windowed/Fullscreen switch

SDL Development
#1

I want my game can run in both windowed/fullscreen mode.
Before I call SetVideoMode twice, need I free the primary surface
first?

need I do sth like following or not:

SDL_Surface *screen = SetVideoMode(…);

// …

//
SDL_Surface *tmpsurface = screen;
SDL_Surface *screen = SetVideoMode(…);

SDL_FreeSurface( tmpsurface );

Thanks for help. _

#2

Quoth kasicass , on 2005-05-26 10:38:51 +0000:

I want my game can run in both windowed/fullscreen mode.
Before I call SetVideoMode twice, need I free the primary surface
first?

No. Read the manual.

RETURN VALUE
The framebuffer surface, or NULL if it fails. The surface
returned is freed by SDL_Quit() and should not be freed by the
caller.

(emphasis mine)

—> Drake Wilson
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#3

I want my game can run in both windowed/fullscreen mode. Before I call SetVideoMode twice, need I free the primary surface first?
No.

My toggle code (minus irrelevant parts) is this -

void SDLVideoDriver::toggleFullScreen (void)
{
bool bFullScreen = !getFullScreen();

SDL_QuitSubSystem(SDL_INIT_VIDEO);
SDL_InitSubSystem(SDL_INIT_VIDEO);

SDL_Surface* pNewSurf = setVideoBestBPP(m_nWidth, m_nHeight,

bFullScreen ? SDL_FULLSCREEN : 0);

if (pNewSurf == NULL)
{
	GameApp::writeToLog(String::fromFormat("S: Toggle failed (%c -> %c) [%

s]\n", bFullScreen ? ‘W’ : ‘F’, bFullScreen ? ‘F’ : ‘W’, SDL_GetError
()));
SDL_QuitSubSystem(SDL_INIT_VIDEO);
SDL_InitSubSystem(SDL_INIT_VIDEO);

	bFullScreen = !bFullScreen;

	pNewSurf = setVideoBestBPP(m_nWidth, m_nHeight, bFullScreen ?

SDL_FULLSCREEN : 0);

	if (pNewSurf == NULL)
		GFC_FATAL(String::fromFormat("S: Couldn't restore old video mode,

aborting [%s]", SDL_GetError()));
}

m_pScreenSurf = pNewSurf;

}

setVideoBestBPP() just tries different bit depths using SDL_VideoModeOK
() and sets the first one available.

--Gabriel
#4

I do not believe you have to quit and init the subsystem. Just go
ahead and set the video mode to what you want.

ChrisOn 5/26/05, Gabriel wrote:

I want my game can run in both windowed/fullscreen mode. Before I call SetVideoMode twice, need I free the primary surface first?
No.

My toggle code (minus irrelevant parts) is this -

void SDLVideoDriver::toggleFullScreen (void)
{
bool bFullScreen = !getFullScreen();

    SDL_QuitSubSystem(SDL_INIT_VIDEO);
    SDL_InitSubSystem(SDL_INIT_VIDEO);

–
E-Mail: Chris Nystrom
Business: http://www.shaklee.net/austin
Blog: http://conversazione.blogspot.com/
AIM: nystromchris

#5

El mi?, 01-06-2005 a las 07:48 -0500, Chris Nystrom escribi?:

My toggle code (minus irrelevant parts) is this -

void SDLVideoDriver::toggleFullScreen (void)
{
bool bFullScreen = !getFullScreen();

    SDL_QuitSubSystem(SDL_INIT_VIDEO);
    SDL_InitSubSystem(SDL_INIT_VIDEO);

I do not believe you have to quit and init the subsystem. Just go
ahead and set the video mode to what you want.

That’s what I had, and got a lot of crashes saying DirectDraw couldn’t
set the video mode because it was already initialized or something like
that. This new code works just fine.

--Gabriel