From 6fccf062fba5873c00199d84d5daf7568a7734dc Mon Sep 17 00:00:00 2001
From: Rye <rye@alchemyviewer.org>
Date: Tue, 4 Nov 2025 23:48:19 -0500
Subject: Improve fix for line width crashes under certain Mesa GL drivers

We default to and only use aliased lines.

Signed-off-by: Rye <rye@alchemyviewer.org>
---
 indra/llrender/llgl.cpp     | 6 +-----
 indra/llrender/llgl.h       | 3 +--
 indra/llrender/llrender.cpp | 9 +--------
 3 files changed, 3 insertions(+), 15 deletions(-)

diff --git a/indra/llrender/llgl.cpp b/indra/llrender/llgl.cpp
index c45ad70758..260f787a51 100644
--- a/indra/llrender/llgl.cpp
+++ b/indra/llrender/llgl.cpp
@@ -1329,11 +1329,7 @@ bool LLGLManager::initGL()
     glGetIntegerv(GL_MAX_UNIFORM_BLOCK_SIZE, &mMaxUniformBlockSize);
 
     // If outside the allowed range, glLineWidth fails with "invalid value".
-    // On Darwin, the range is [1, 1].
-    GLfloat line_width_range[2]{0.f};
-    glGetFloatv(GL_SMOOTH_LINE_WIDTH_RANGE, line_width_range);
-    mMinSmoothLineWidth = line_width_range[0];
-    mMaxSmoothLineWidth = line_width_range[1];
+    glGetFloatv(GL_ALIASED_LINE_WIDTH_RANGE, mAliasedLineRange.mV);
 
     // sanity clamp max uniform block size to 64k just in case
     // there's some implementation that reports a crazy value
diff --git a/indra/llrender/llgl.h b/indra/llrender/llgl.h
index 3a311ad03b..5098478c22 100644
--- a/indra/llrender/llgl.h
+++ b/indra/llrender/llgl.h
@@ -92,8 +92,7 @@ public:
     F32 mMaxAnisotropy = 0.f;
     S32 mMaxUniformBlockSize = 0;
     S32 mMaxVaryingVectors = 0;
-    F32 mMinSmoothLineWidth = 1.f;
-    F32 mMaxSmoothLineWidth = 1.f;
+    LLVector2 mAliasedLineRange = LLVector2(1.f, 1.f);
 
     // GL 4.x capabilities
     bool mHasCubeMapArray = false;
diff --git a/indra/llrender/llrender.cpp b/indra/llrender/llrender.cpp
index 0d7ebd4a25..ab88e4868e 100644
--- a/indra/llrender/llrender.cpp
+++ b/indra/llrender/llrender.cpp
@@ -1930,14 +1930,7 @@ void LLRender::setLineWidth(F32 width)
 {
     gGL.flush();
 
-    if(sGLCoreProfile)
-    {
-        width = 1.f;
-    }
-    else
-    {
-        width = llclamp(width, gGLManager.mMinSmoothLineWidth, gGLManager.mMaxSmoothLineWidth);
-    }
+    width = llclamp(width, gGLManager.mAliasedLineRange[0], gGLManager.mAliasedLineRange[1]);
     if(mLineWidth != width)
     {
         mLineWidth = width;
-- 
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