Merge pull request #4935 from RyeMutt/rye/lnxfixlines

Improve fix for line width crashes under certain Mesa GL drivers

Author: Geenz

indra/llrender/llgl.cpp

@@ -1326,11 +1326,7 @@ 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

indra/llrender/llgl.h

@@ -92,8 +92,7 @@ class LLGLManager
     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;

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;