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Fix AgX (#3574)

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Fix AgX tinting by adjusting math, use AgX punchy look
https://files.facepunch.com/alexguthrie/1b0911b1/fixed_agx.png
This commit is contained in:
Alex Guthrie
2025-12-09 03:02:11 +00:00
committed by GitHub
parent a9089d3780
commit 2a235be3f8
2 changed files with 11 additions and 14 deletions
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3
engine/Sandbox.Engine/Scene/Components/PostProcessing/Effects/Tonemapping.cs
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@@ -35,7 +35,8 @@ public class Tonemapping : BasePostProcess<Tonemapping>
/// </summary>
Linear,
/// <summary>
/// Default AgX implementation
/// Similar to ACES - very realistic, but handles lower and higher brightness ranges better.
/// Uses the Punchy AgX look.
/// </summary>
AgX
}

22
game/addons/base/Assets/shaders/tonemapping/tonemapping.shader
View File

@@ -172,33 +172,29 @@ PS
0.0482516061458583, 0.101439036467562, 0.811302368396859
);
float flExposureMin = -12.47393f;
float flExposureMax = 4.026069f;
// Prevent negative values
vColor = max( vColor, 0.0.xxx );
// Apply
vColor = mul( mAgx, vColor );
vColor = mul( vColor, mAgx );
// Log2 transform
float flExposureMin = -12.47393f;
float flExposureMax = 4.026069f;
vColor = max( vColor, 1e-10.xxx );
vColor = clamp( log2( vColor ), flExposureMin, flExposureMax );
vColor = ( vColor - flExposureMin ) / ( flExposureMax - flExposureMin );
vColor = AgxTonescale( vColor );
// custom power that attempts to remove some of AgX's natural
// tendency to desaturate blues and greens, resulting in
// a more neutral look
float3 vPower = float3( 1.2, 1.0, 1.0 );
float flSat = 1.4; // Raise saturation to match ACES
// AgX Punchy look
float3 vPower = float3( 1.35.xxx );
float flSat = 1.4;
vColor = pow( vColor, vPower );
float3 flLumaWeight = float3( 0.2126, 0.7152, 0.0722 );
float flLuma = dot( vColor, flLumaWeight );
float flLuma = CalculateLuminance( vColor );
vColor = flLuma + flSat * ( vColor - flLuma );
// AgX outset matrix combined with Rec2020 to linear sRGB
@@ -208,8 +204,8 @@ PS
-0.0990297440797205, -0.0989611768448433, 1.15107367264116
);
vColor = mul( vColor, mAgxInv );
vColor = pow( vColor, 2.2.xxx );
vColor = mul( mAgxInv, vColor );
vColor = max( vColor, 0.0.xxx );
}