#1870 Tune up for better experience on integrated intel with low memory (#1872)

* More deterministic vsize calculation.   Add control for choosing downscale method.
* Quick hack to make GLTF preview work again

1 files changed, 8 insertions, 4 deletions

diff --git a/indra/newview/llappviewer.cpp b/indra/newview/llappviewer.cpp
index 51099a480d..ac689f7319 100644
--- a/indra/newview/llappviewer.cpp
+++ b/indra/newview/llappviewer.cpp
@@ -2210,10 +2210,10 @@ bool LLAppViewer::initThreads()
         cores = llmin(cores, (S32) max_cores);
     }
 
-    // The only configurable thread count right now is ImageDecode
-    // The viewer typically starts around 8 threads not including image decode,
-    // so try to leave at least one core free
-    S32 image_decode_count = llclamp(cores - 9, 1, 8);
+    // always use at least 2 threads for image decoding to prevent
+    // a single texture blocking all other textures from decoding
+    S32 image_decode_count = llclamp(cores - 6, 2, 16);
+
     threadCounts["ImageDecode"] = image_decode_count;
     gSavedSettings.setLLSD("ThreadPoolSizes", threadCounts);
 
@@ -4609,6 +4609,10 @@ void LLAppViewer::idle()
 
     LLGLTFMaterialList::flushUpdates();
 
+    static LLCachedControl<U32> downscale_method(gSavedSettings, "RenderDownScaleMethod");
+    gGLManager.mDownScaleMethod = downscale_method;
+    LLImageGL::updateClass();
+
     // Service the WorkQueue we use for replies from worker threads.
     // Use function statics for the timeslice setting so we only have to fetch
     // and convert MainWorkTime once.