Change the brightness / gamma of the whole scene in OpenGL

Question

Does anyone know how I can achieve the following effect in OpenGL:

• Changing scene rendering brightness
• Or implement Gamma customization in OpenGL

I tried to change the ambient light parameter and the type of light (directional and omnidirectional), but the result was uneven. TIA.

Thank you for your help, additional information: * I can not use the Windows specification API. * The gamma setting should not affect the whole window, since I have to have a different gamma for different types.

Answer 1

win32 SetDeviceGammaRamp /. , , .

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if( brightness > 1 )
{
    glBlendFunc( GL_DEST_COLOR, GL_ONE );
    glColor3f( brightness-1, brightness-1, brightness-1 );
}
else
{
    glBlendFunc( GL_ZERO, GL_SRC_COLOR );
    glColor3f( brightness, brightness, brightness );
}
glEnable( GL_BLEND );

draw_quad();

Answer 2

http://www.gamedev.net/community/forums/topic.asp?topic_id=435400 , -