Lift, Gamma, Gain Shader?

[TreyM]

Does a shader for MMF exist to allow RGB adjustment of shadows, midtones, and highlights separately? (Like the way it's done in SweetFX )

SweetFX is basically a custom d3d9.dll hook to inject post processing on DX9 - DX11 games.

Here is the LiftGammaGain.h file from SweetFX:

   /*-----------------------------------------------------------.   
  /                      Lift Gamma Gain                        /
  '-----------------------------------------------------------*/
/*
  by 3an and CeeJay.dk
  
  Version 1.1
*/

float4 LiftGammaGainPass( float4 colorInput )
{
	// -- Get input --
	float3 color = colorInput.rgb;
	
	// -- Lift --
	//color = color + (RGB_Lift / 2.0 - 0.5) * (1.0 - color); 
	color = color * (1.5-0.5 * RGB_Lift) + 0.5 * RGB_Lift - 0.5;
	color = saturate(color); //isn't strictly necessary, but doesn't cost performance.
	
	// -- Gain --
	color *= RGB_Gain; 
	
	// -- Gamma --
	colorInput.rgb = pow(color, 1.0 / RGB_Gamma); //Gamma
	
	// -- Return output --
	//return (colorInput);
	return saturate(colorInput);
}

The shader is configured by the user editing a SweetFX_Settings text file which gets read by the custom d3d9.dll. The Lift, Gamma, Gain section looks like this:

   /*-----------------------------------------------------------.
  /                      Lift Gamma Gain settings               /
  '-----------------------------------------------------------*/
#define RGB_Lift  float3(1.000, 1.000, 1.000)  //[0.000 to 2.000] Adjust shadows for Red, Green and Blue.
#define RGB_Gamma float3(1.000, 1.000, 1.000)  //[0.000 to 2.000] Adjust midtones for Red, Green and Blue
#define RGB_Gain  float3(1.000, 1.000, 1.000)  //[0.000 to 2.000] Adjust highlights for Red, Green and Blue

//Note that a value of 1.000 is a neutral setting that leave the color unchanged.

I think it would be awesome to be able to basically color grade your game in real time to shift the mood of the entire scene, seamlessly. Doing a day to night transition would be theoretically possible.

[TreyM]

Bumping and requesting that post post be moved to the correct section.