From a2e9a0caf32003253766efe528329fdd11f28b0b Mon Sep 17 00:00:00 2001
From: Andrey Kleshchev <andreykproductengine@lindenlab.com>
Date: Tue, 24 Sep 2024 22:20:35 +0300
Subject: viewer-private#291 Object floating text does not update without
 moving camera

---
 indra/newview/llhudtext.cpp | 16 +++++++++++++++-
 indra/newview/llhudtext.h   |  4 +++-
 2 files changed, 18 insertions(+), 2 deletions(-)

(limited to 'indra')

diff --git a/indra/newview/llhudtext.cpp b/indra/newview/llhudtext.cpp
index 92f09c34a0..818474a0cb 100644
--- a/indra/newview/llhudtext.cpp
+++ b/indra/newview/llhudtext.cpp
@@ -185,6 +185,15 @@ void LLHUDText::renderText()
     LLVector3 render_position = mPositionAgent
             + (x_pixel_vec * screen_offset.mV[VX])
             + (y_pixel_vec * screen_offset.mV[VY]);
+    bool reset_buffers = false;
+    const F32 treshold = 0.000001f;
+    if (abs(mLastRenderPosition.mV[VX] - render_position.mV[VX]) > treshold
+        || abs(mLastRenderPosition.mV[VY] - render_position.mV[VY]) > treshold
+        || abs(mLastRenderPosition.mV[VZ] - render_position.mV[VZ]) > treshold)
+    {
+        reset_buffers = true;
+        mLastRenderPosition = render_position;
+    }
 
     F32 y_offset = (F32)mOffsetY;
 
@@ -208,6 +217,11 @@ void LLHUDText::renderText()
         for (std::vector<LLHUDTextSegment>::iterator segment_iter = mTextSegments.begin() + start_segment;
              segment_iter != mTextSegments.end(); ++segment_iter )
         {
+            if (reset_buffers)
+            {
+                segment_iter->mFontBufferText.reset();
+            }
+
             const LLFontGL* fontp = segment_iter->mFont;
             y_offset -= fontp->getLineHeight() - 1; // correction factor to match legacy font metrics
 
@@ -231,7 +245,7 @@ void LLHUDText::renderText()
             }
             text_color.mV[VALPHA] *= alpha_factor;
 
-            hud_render_text(segment_iter->getText(), render_position, &mFontBuffer, *fontp, style, shadow, x_offset, y_offset, text_color, mOnHUDAttachment);
+            hud_render_text(segment_iter->getText(), render_position, &segment_iter->mFontBufferText, *fontp, style, shadow, x_offset, y_offset, text_color, mOnHUDAttachment);
         }
     }
     /// Reset the default color to white.  The renderer expects this to be the default.
diff --git a/indra/newview/llhudtext.h b/indra/newview/llhudtext.h
index 224677736c..4c850e2d91 100644
--- a/indra/newview/llhudtext.h
+++ b/indra/newview/llhudtext.h
@@ -67,6 +67,8 @@ protected:
         LLColor4                mColor;
         LLFontGL::StyleFlags    mStyle;
         const LLFontGL*         mFont;
+        LLFontVertexBuffer      mFontBuffer;
+        LLFontVertexBuffer      mFontBufferText;
     private:
         LLWString               mText;
         std::map<const LLFontGL*, F32> mFontWidthMap;
@@ -152,6 +154,7 @@ private:
     const LLFontGL* mBoldFontp;
     LLRectf         mSoftScreenRect;
     LLVector3       mPositionAgent;
+    LLVector3       mLastRenderPosition;
     LLVector2       mPositionOffset;
     LLVector2       mTargetPositionOffset;
     F32             mMass;
@@ -162,7 +165,6 @@ private:
     ETextAlignment  mTextAlignment;
     EVertAlignment  mVertAlignment;
     bool            mHidden;
-    LLFontVertexBuffer   mFontBuffer;
 
     static bool    sDisplayText ;
     static std::set<LLPointer<LLHUDText> > sTextObjects;
-- 
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