From 441c844ec8319f4c15d59de5a5a8ae46be7912f1 Mon Sep 17 00:00:00 2001
From: Ansariel <ansariel.hiller@phoenixviewer.com>
Date: Thu, 17 Apr 2025 18:55:08 +0200
Subject: Fix lerp issues on newer GCC versions

---
 indra/llmath/llmath.h                      |  5 +----
 indra/llmath/llvolume.cpp                  | 25 +++++++++++++------------
 indra/newview/llpanelprimmediacontrols.cpp |  2 +-
 3 files changed, 15 insertions(+), 17 deletions(-)

diff --git a/indra/llmath/llmath.h b/indra/llmath/llmath.h
index c0f5b3dbf3..fe9a22983d 100644
--- a/indra/llmath/llmath.h
+++ b/indra/llmath/llmath.h
@@ -348,10 +348,7 @@ inline F32 snap_to_sig_figs(F32 foo, S32 sig_figs)
     return new_foo;
 }
 
-inline F32 lerp(F32 a, F32 b, F32 u)
-{
-    return a + ((b - a) * u);
-}
+using std::lerp;
 
 inline F32 lerp2d(F32 x00, F32 x01, F32 x10, F32 x11, F32 u, F32 v)
 {
diff --git a/indra/llmath/llvolume.cpp b/indra/llmath/llvolume.cpp
index 76e5e3aae9..1e7dfd18f2 100644
--- a/indra/llmath/llvolume.cpp
+++ b/indra/llmath/llvolume.cpp
@@ -1294,10 +1294,11 @@ void LLPath::genNGon(const LLPathParams& params, S32 sides, F32 startOff, F32 en
     c       = cos(ang)*lerp(radius_start, radius_end, t);
 
 
-    pt->mPos.set(0 + lerp(0,params.getShear().mV[0],s)
+    pt->mPos.set(0 + lerp(0.f, params.getShear().mV[VX], s)
                       + lerp(-skew ,skew, t) * 0.5f,
-                    c + lerp(0,params.getShear().mV[1],s),
+                    c + lerp(0.f, params.getShear().mV[VY], s),
                     s);
+
     pt->mScale.set(hole_x * lerp(taper_x_begin, taper_x_end, t),
         hole_y * lerp(taper_y_begin, taper_y_end, t),
         0,1);
@@ -1327,9 +1328,9 @@ void LLPath::genNGon(const LLPathParams& params, S32 sides, F32 startOff, F32 en
         c   = cos(ang)*lerp(radius_start, radius_end, t);
         s   = sin(ang)*lerp(radius_start, radius_end, t);
 
-        pt->mPos.set(0 + lerp(0,params.getShear().mV[0],s)
+        pt->mPos.set(0 + lerp(0.f, params.getShear().mV[VX], s)
                           + lerp(-skew ,skew, t) * 0.5f,
-                        c + lerp(0,params.getShear().mV[1],s),
+                        c + lerp(0.f, params.getShear().mV[VY], s),
                         s);
 
         pt->mScale.set(hole_x * lerp(taper_x_begin, taper_x_end, t),
@@ -1354,9 +1355,9 @@ void LLPath::genNGon(const LLPathParams& params, S32 sides, F32 startOff, F32 en
     c   = cos(ang)*lerp(radius_start, radius_end, t);
     s   = sin(ang)*lerp(radius_start, radius_end, t);
 
-    pt->mPos.set(0 + lerp(0,params.getShear().mV[0],s)
+    pt->mPos.set(0 + lerp(0.f, params.getShear().mV[VX], s)
                       + lerp(-skew ,skew, t) * 0.5f,
-                    c + lerp(0,params.getShear().mV[1],s),
+                    c + lerp(0.f, params.getShear().mV[VY], s),
                     s);
     pt->mScale.set(hole_x * lerp(taper_x_begin, taper_x_end, t),
                    hole_y * lerp(taper_y_begin, taper_y_end, t),
@@ -1494,8 +1495,8 @@ bool LLPath::generate(const LLPathParams& params, F32 detail, S32 split,
             for (S32 i=0;i<np;i++)
             {
                 F32 t = lerp(params.getBegin(),params.getEnd(),(F32)i * mStep);
-                mPath[i].mPos.set(lerp(0,params.getShear().mV[0],t),
-                                     lerp(0,params.getShear().mV[1],t),
+                mPath[i].mPos.set(lerp(0.f, params.getShear().mV[VX], t),
+                                     lerp(0.f ,params.getShear().mV[VY], t),
                                      t - 0.5f);
                 LLQuaternion quat;
                 quat.setQuat(lerp(F_PI * params.getTwistBegin(),F_PI * params.getTwist(),t),0,0,1);
@@ -1559,10 +1560,10 @@ bool LLPath::generate(const LLPathParams& params, F32 detail, S32 split,
         {
             F32 t = (F32)i * mStep;
             mPath[i].mPos.set(0,
-                                lerp(0,   -sin(F_PI*params.getTwist()*t)*0.5f,t),
-                                lerp(-0.5f, cos(F_PI*params.getTwist()*t)*0.5f,t));
-            mPath[i].mScale.set(lerp(1,params.getScale().mV[0],t),
-                                lerp(1,params.getScale().mV[1],t), 0,1);
+                                lerp(0.f,  -sin(F_PI*params.getTwist() * t) * 0.5f, t),
+                                lerp(-0.5f, cos(F_PI*params.getTwist() * t) * 0.5f, t));
+            mPath[i].mScale.set(lerp(1.f, params.getScale().mV[VX], t),
+                                lerp(1.f, params.getScale().mV[VY], t), 0.f, 1.f);
             mPath[i].mTexT  = t;
             LLQuaternion quat;
             quat.setQuat(F_PI * params.getTwist() * t,1,0,0);
diff --git a/indra/newview/llpanelprimmediacontrols.cpp b/indra/newview/llpanelprimmediacontrols.cpp
index b00b9d1ad1..b1c8b5f36a 100644
--- a/indra/newview/llpanelprimmediacontrols.cpp
+++ b/indra/newview/llpanelprimmediacontrols.cpp
@@ -777,7 +777,7 @@ void LLPanelPrimMediaControls::draw()
     else if(mFadeTimer.getStarted())
     {
         F32 time = mFadeTimer.getElapsedTimeF32();
-        alpha *= llmax(lerp(1.0, 0.0, time / mControlFadeTime), 0.0f);
+        alpha *= llmax(lerp(1.f, 0.f, time / mControlFadeTime), 0.0f);
 
         if(time >= mControlFadeTime)
         {
-- 
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