[HLSL CODE] 3D LUT

[Guzio]

Just use a Hue/Saturation

[phoenixfabricio]

Thanks, Rudy!

[phoenixfabricio]

Other Question: Its possible to get a Neutral LUT that does not affect the color and contrast of my Base settings ??? The Neutral LUT in the 1st page and others I find on web when I put in game make the scene very dark and without colors. I have to do a lot of editions in Photoshop and don't get close to my original colors ......

[kingeric1992]

there's probably something wrong with your implementation.

[Kermles]

Thank you kingeric1992 for the useful shader! I exported some film stock simulation .cube LUTs from Adobe Premiere and converted them to .png and .bmp for my own use with this shader, but I figured maybe someone else could use them. Here they are!

To use them you need to rename them, example LUT.png for DX11 or LUT.bmp for DX9 (unless you're using DNI separation, in which case refer to the code in the original post for names).

Another tip: use something like

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float lutIntensity = 1.0; 
color.rgb = lerp(color.rgb, CLutFunc(color.rgb, LUTtex), lutIntensity);

to control the strength of the effect by changing the value of lutIntensity. Replacing float lutIntensity = 1.0; with the code for a GUI variable would be handy but I forget that code at the moment as I'm not at my usual computer right now.

Hopefully someone finds this useful

[Guzio]

Kermles -- Thank you

[ENBSeries]

Maybe better to put this file in separate topic, so it will not be lost here?

[Kermles]

@ENBSeries Okay, wasn't sure if that was appropriate; I'll get right on it.

@Guzio: You're very welcome!

[phoenixfabricio]

Well, I already have an enbeffect.fx with one LUT for all situations. If I want to make a DNI separation and include 2 more LUT files for Nights and Interiors, what are the specific lines I need to replace (or add) in the fx file ? I read the posts in previous page, but I'm afraid I didn't understand ...... Thanks in advance.

[Adyss]

So i have a little trick for multiple luts first the add the function anywere:

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static const float2 Lut_Size256 = float2(256.0, 16.0);

float3 Lut256( float3 colorIN, Texture2D lutTexIn ) {
    float2 CLut_pSize = 1.0 / Lut_Size256;
    float4 CLut_UV;
    colorIN    = saturate(colorIN) * ( Lut_Size256.y - 1.0);
    CLut_UV.w  = floor(colorIN.b);
    CLut_UV.xy = (colorIN.rg + 0.5) * CLut_pSize;
    CLut_UV.x += CLut_UV.w * CLut_pSize.y;
    CLut_UV.z  = CLut_UV.x + CLut_pSize.y;
    return       lerp (lutTexIn.SampleLevel(Sampler1, CLut_UV.xy, 0).rgb, 
                       lutTexIn.SampleLevel(Sampler1, CLut_UV.zy, 0).rgb, colorIN.b - CLut_UV.w);
}


static const float2 Lut_Size1024 = float2(1024.0, 32.0);

float3 Lut1024( float3 colorIN, Texture2D lutTexIn ) {
    float2 CLut_pSize = 1.0 / Lut_Size1024;
    float4 CLut_UV;
    colorIN    = saturate(colorIN) * ( Lut_Size1024.y - 1.0);
    CLut_UV.w  = floor(colorIN.b);
    CLut_UV.xy = (colorIN.rg + 0.5) * CLut_pSize;
    CLut_UV.x += CLut_UV.w * CLut_pSize.y;
    CLut_UV.z  = CLut_UV.x + CLut_pSize.y;
    return       lerp (lutTexIn.SampleLevel(Sampler1, CLut_UV.xy, 0).rgb, 
                       lutTexIn.SampleLevel(Sampler1, CLut_UV.zy, 0).rgb, colorIN.b - CLut_UV.w);
}


static const float2 Lut_Size4096 = float2(4096.0, 64.0);

float3 Lut4096( float3 colorIN, Texture2D lutTexIn ) {
    float2 CLut_pSize = 1.0 / Lut_Size4096;
    float4 CLut_UV;
    colorIN    = saturate(colorIN) * ( Lut_Size4096.y - 1.0);
    CLut_UV.w  = floor(colorIN.b);
    CLut_UV.xy = (colorIN.rg + 0.5) * CLut_pSize;
    CLut_UV.x += CLut_UV.w * CLut_pSize.y;
    CLut_UV.z  = CLut_UV.x + CLut_pSize.y;
    return       lerp (lutTexIn.SampleLevel(Sampler1, CLut_UV.xy, 0).rgb, 
                       lutTexIn.SampleLevel(Sampler1, CLut_UV.zy, 0).rgb, colorIN.b - CLut_UV.w);
}

This basically make 3 functions that you have to choose from depending on what size your lut has
in your pixel shader you want to do something like:

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	//example:
	color.rgb = Lut4096(color.rgb, LOGtoREC);
	
	//In case you want seperate luts for each daytime you will need to load 3 luts. Apply them by doing:
    color.rgb = lerp(lerp(Lut256(color.rgb, LUTxy_Night), 
                          Lut256(color.rgb, LUTxy_Day),      ENightDayFactor),
                          Lut256(color.rgb, LUTxy_Interior), EInteriorFactor);

Depending on the size of the lut you loaded you will need a diffrent function to apply it
available lut sizes are: 256x16 1024x32 4096x64
functions for these are: Lut256 Lut1024 Lut4096
also youll need to load the lut textures of cause (look main post)

now to the switch part. Make a UI item like that:

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float	LUTSwitch
<
	string UIName="Choose LUT";
	string UIWidget="spinner";
	float UIMin=0.0;
	float UIMax=3.0;
	float UIStep=1.0;
> = {0.0};

and then bring the part of the pixel shader into { } with an if. Like that:

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	if (LUTSwitch==1) {
    color.rgb = Lut4096(color.rgb, LOGtoREC);
	}
	
	if (LUTSwitch==2) {
	color.rgb = Lut1024(color.rgb, sLOG_LUT);
	}
	
	if (LUTSwitch==3) {
    color.rgb = lerp(lerp(Lut256(color.rgb, LUTxy_Night), 
                          Lut256(color.rgb, LUTxy_Day),      ENightDayFactor),
                          Lut256(color.rgb, LUTxy_Interior), EInteriorFactor);
	}

if you have questions to it you can read up on my LUTSetup.fxh file of my Shader Libary i wrote something more detailed there. Or ask me on discord