From f5a25a9d6a94e7899ddb04199e5c4fd2d56228d1 Mon Sep 17 00:00:00 2001
From: "Jonathan \"Geenz\" Goodman" <geenz@lindenlab.com>
Date: Wed, 5 Mar 2025 19:06:01 -0500
Subject: Add RenderTextureVRAMDivisor (#3648)

#3647 Add texture VRAM use divisor.
---
 indra/newview/app_settings/settings.xml | 11 +++++++++++
 indra/newview/llviewertexture.cpp       |  8 +++++++-
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/indra/newview/app_settings/settings.xml b/indra/newview/app_settings/settings.xml
index 6f2a9932bc..594f40e5a1 100644
--- a/indra/newview/app_settings/settings.xml
+++ b/indra/newview/app_settings/settings.xml
@@ -7794,6 +7794,17 @@
     <key>Value</key>
     <integer>0</integer>
   </map>
+  <key>RenderTextureVRAMDivisor</key>
+  <map>
+      <key>Comment</key>
+      <string>Divisor for maximum amount of VRAM the viewer will use for textures. 1 = all the VRAM.  Used in conjunction with RenderMaxVRAMBudget.</string>
+      <key>Persist</key>
+      <integer>1</integer>
+      <key>Type</key>
+      <string>U32</string>
+      <key>Value</key>
+      <integer>2</integer>
+  </map>
   <key>RenderMinFreeMainMemoryThreshold</key>
   <map>
     <key>Comment</key>
diff --git a/indra/newview/llviewertexture.cpp b/indra/newview/llviewertexture.cpp
index 609ad38e96..a0723db479 100644
--- a/indra/newview/llviewertexture.cpp
+++ b/indra/newview/llviewertexture.cpp
@@ -489,7 +489,12 @@ void LLViewerTexture::updateClass()
     }
 
     LLViewerMediaTexture::updateClass();
-
+    // This is a divisor used to determine how much VRAM from our overall VRAM budget to use.
+    // This is **cumulative** on whatever the detected or manually set VRAM budget is.
+    // If we detect 2048MB of VRAM, this will, by default, only use 1024.
+    // If you set 1024MB of VRAM, this will, by default, use 512.
+    // -Geenz 2025-03-03
+    static LLCachedControl<U32> tex_vram_divisor(gSavedSettings, "RenderTextureVRAMDivisor", 2);
     static LLCachedControl<U32> max_vram_budget(gSavedSettings, "RenderMaxVRAMBudget", 0);
 
     F64 texture_bytes_alloc = LLImageGL::getTextureBytesAllocated() / 1024.0 / 512.0;
@@ -500,6 +505,7 @@ void LLViewerTexture::updateClass()
     F32 used = (F32)ll_round(texture_bytes_alloc + vertex_bytes_alloc);
 
     F32 budget = max_vram_budget == 0 ? (F32)gGLManager.mVRAM : (F32)max_vram_budget;
+    budget /= tex_vram_divisor;
 
     // Try to leave at least half a GB for everyone else and for bias,
     // but keep at least 768MB for ourselves
-- 
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