Add gamma support to SDL device.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@2572 dfc29bdd-3216-0410-991c-e03cc46cb475

source/Irrlicht/CIrrDeviceSDL.cpp

@@ -778,6 +778,21 @@ bool CIrrDeviceSDL::isWindowMinimized() const
 }
 
 
+//! Set the current Gamma Value for the Display
+bool CIrrDeviceSDL::setGammaRamp( f32 red, f32 green, f32 blue, f32 brightness, f32 contrast )
+{
+	return (SDL_SetGamma(red, green, blue) != -1);
+}
+
+//! Get the current Gamma Value for the Display
+bool CIrrDeviceSDL::getGammaRamp( f32 &red, f32 &green, f32 &blue, f32 &brightness, f32 &contrast )
+{
+	brightness = 0.f;
+	contrast = 0.f;
+	return (SDL_GetGamma(&red, &green, &blue) != -1);
+
+}
+
 //! returns color format of the window.
 video::ECOLOR_FORMAT CIrrDeviceSDL::getColorFormat() const
 {

source/Irrlicht/CIrrDeviceSDL.h

@@ -74,6 +74,12 @@ namespace irr
 		//! Activate any joysticks, and generate events for them.
 		virtual bool activateJoysticks(core::array<SJoystickInfo> & joystickInfo);
 
+		//! Set the current Gamma Value for the Display
+		virtual bool setGammaRamp( f32 red, f32 green, f32 blue, f32 brightness, f32 contrast );
+
+		//! Get the current Gamma Value for the Display
+		virtual bool getGammaRamp( f32 &red, f32 &green, f32 &blue, f32 &brightness, f32 &contrast );
+
 		//! Get the device type
 		virtual E_DEVICE_TYPE getType() const
 		{