From 52c8cd7e852ff207dd6b6acf875dc53a4677e9c7 Mon Sep 17 00:00:00 2001
From: Jeremy Selan <jeremys@valvesoftware.com>
Date: Wed, 10 Jan 2024 14:46:08 -0800
Subject: [PATCH] [color_helpers]: do not do color remapping for PQ source
 content

Fixes a bug where HDR colors were not being rendered faithfully at the edges of the color gamut.

Thanks to JDSP for reporting.
---
 src/color_helpers.cpp | 24 ++++++------------------
 1 file changed, 6 insertions(+), 18 deletions(-)

diff --git a/src/color_helpers.cpp b/src/color_helpers.cpp
index 7a6e046f30..4ec148a655 100644
--- a/src/color_helpers.cpp
+++ b/src/color_helpers.cpp
@@ -866,24 +866,12 @@ void buildPQColorimetry( displaycolorimetry_t * pColorimetry, colormapping_t *pM
 {
     *pColorimetry = displaycolorimetry_2020;
 
-    if ( BIsWideGamut( nativeDisplayOutput) )
-    {
-        colormapping_t smoothRemap;
-        smoothRemap.blendEnableMinSat = 0.7f;
-        smoothRemap.blendEnableMaxSat = 1.0f;
-        smoothRemap.blendAmountMin = 0.0f;
-        smoothRemap.blendAmountMax = 1.f;
-        *pMapping = smoothRemap;
-    }
-    else
-    {
-        colormapping_t noRemap;
-        noRemap.blendEnableMinSat = 0.7f;
-        noRemap.blendEnableMaxSat = 1.0f;
-        noRemap.blendAmountMin = 0.0f;
-        noRemap.blendAmountMax = 0.0f;
-        *pMapping = noRemap;
-    }
+    colormapping_t noRemap;
+    noRemap.blendEnableMinSat = 0.0f;
+    noRemap.blendEnableMaxSat = 1.0f;
+    noRemap.blendAmountMin = 0.0f;
+    noRemap.blendAmountMax = 0.0f;
+    *pMapping = noRemap;
 }
 
 bool approxEqual( const glm::vec3 & a, const glm::vec3 & b, float flTolerance = 1e-5f )