Game brightness
October 18, 2002 12:22 PM
Is there a way to increase the overall brightness in your game window without increasing lighting. Maybe a pixel format setting or something like that.
122
October 18, 2002 12:41 PM
It''ll vary depending on the API you''re using, but searching your documentation for ''gamma'' should point you in the right direction. I''m not completely positive, but I think the gamma methods in D3D only work in full-screen mode. Good luck!
122
October 18, 2002 02:07 PM
GetDeviceGammaRamp and SetDeviceGammaRamp are available via the GDI for HDC related use.
October 18, 2002 04:46 PM
MSDN does not give me any examples of these commands other than the syntax:
BOOL WINAPI SetDeviceGammaRamp(
HDC hDC,
LPVOID lpRamp
);
What is the LPVOID data type? Can someone post an example of using GetDeviceGammaRamp() and SetDeviceGammaRamp().
I''m guessing you''d just call it like this:
if (GetDeviceGammaRamp(HDC, ???))
{
SetDeviceGammaRamp(HDC, ???)
}
Am I somewhat close to correct?
Thanks!
BOOL WINAPI SetDeviceGammaRamp(
HDC hDC,
LPVOID lpRamp
);
What is the LPVOID data type? Can someone post an example of using GetDeviceGammaRamp() and SetDeviceGammaRamp().
I''m guessing you''d just call it like this:
if (GetDeviceGammaRamp(HDC, ???))
{
SetDeviceGammaRamp(HDC, ???)
}
Am I somewhat close to correct?
Thanks!
122
October 18, 2002 08:17 PM
First off, the HDC is kind of irrelevant since this only applies to the whole driver, i.e., you can''t apply it to just a window. So just use the DC for the desktop window (I''m assuming MS Windows btw. 
)
The LPVOID points to an array of 3*256 unsigned ints. 256 for the red channel, 256 for green, ...
It''s kind of tricky what''s going on. There''s a paper on the web somewhere that explains what gamma is in this context but I don''t have the link and I can''t remember the equation.
But, I have code! It''s something I hacked together a while back. It looks like poo but it worked at the time. Hope it helps.
)The LPVOID points to an array of 3*256 unsigned ints. 256 for the red channel, 256 for green, ...
It''s kind of tricky what''s going on. There''s a paper on the web somewhere that explains what gamma is in this context but I don''t have the link and I can''t remember the equation.
But, I have code! It''s something I hacked together a while back. It looks like poo but it worked at the time. Hope it helps.
//-----------------------------------------------------------------------------// iGamma: ranges from -255 to +255; negatives make the screen "darker"//-----------------------------------------------------------------------------void AdjustGamma( int iGamma ){ HDC hDC = GetDC(GetDesktopWindow()); bool bMinus = iGamma < 0; if( bMinus ) iGamma = -iGamma; iGamma = min(max(iGamma, 0), 255); if( hDC ) { const int iNum = 256; struct sRamp { WORD wRed[iNum]; WORD wGreen[iNum]; WORD wBlue[iNum]; } wRamp; if( GetDeviceGammaRamp(hDC, (LPVOID)&wRamp) ) { for( int i = 0; i < iNum; i++ ) { if( bMinus ) { wRamp.wRed[i] = (255 - iGamma)*(i); wRamp.wGreen[i] = (255 - iGamma)*(i); wRamp.wBlue[i] = (255 - iGamma)*(i); } else { wRamp.wRed[i] = 65535 - (255 - iGamma)*(255 - i); wRamp.wGreen[i] = 65535 - (255 - iGamma)*(255 - i); wRamp.wBlue[i] = 65535 - (255 - iGamma)*(255 - i); } } BOOL bRet = SetDeviceGammaRamp(hDC, (LPVOID)&wRamp); } ReleaseDC(GetDesktopWindow(), hDC); }} This topic is closed to new replies.
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