From 3e4e414011b032e64b5fd477f2c561fc2b4553f7 Mon Sep 17 00:00:00 2001
From: Cosmic Linden <cosmic@lindenlab.com>
Date: Fri, 16 Feb 2024 09:49:45 -0800
Subject: secondlife/viewer-issues#72: Material preview shouldRender should
 return false if no render needed

---
 indra/newview/llgltfmaterialpreviewmgr.cpp | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

(limited to 'indra/newview/llgltfmaterialpreviewmgr.cpp')

diff --git a/indra/newview/llgltfmaterialpreviewmgr.cpp b/indra/newview/llgltfmaterialpreviewmgr.cpp
index 901db87eed..36bd552c31 100644
--- a/indra/newview/llgltfmaterialpreviewmgr.cpp
+++ b/indra/newview/llgltfmaterialpreviewmgr.cpp
@@ -58,6 +58,15 @@ LLGLTFPreviewTexture::MaterialLoadLevels::MaterialLoadLevels()
     }
 }
 
+bool LLGLTFPreviewTexture::MaterialLoadLevels::isFullyLoaded()
+{
+    for (U32 i = 0; i < LLGLTFMaterial::GLTF_TEXTURE_INFO_COUNT; ++i)
+    {
+        if (levels[i] != FULLY_LOADED) { return false; }
+    }
+    return true;
+}
+
 S32& LLGLTFPreviewTexture::MaterialLoadLevels::operator[](size_t i)
 {
     llassert(i >= 0 && i < LLGLTFMaterial::GLTF_TEXTURE_INFO_COUNT);
@@ -187,17 +196,26 @@ LLPointer<LLGLTFPreviewTexture> LLGLTFPreviewTexture::create(LLPointer<LLFetched
     return new LLGLTFPreviewTexture(material, LLPipeline::MAX_BAKE_WIDTH);
 }
 
-void LLGLTFPreviewTexture::preRender(BOOL clear_depth)
+BOOL LLGLTFPreviewTexture::needsRender()
 {
     LL_PROFILE_ZONE_SCOPED_CATEGORY_UI;
 
+    if (!mShouldRender && mBestLoad.isFullyLoaded()) { return false; }
     MaterialLoadLevels current_load = get_material_load_levels(*mGLTFMaterial.get());
     if (current_load < mBestLoad)
     {
         mShouldRender = true;
         mBestLoad = current_load;
+        return true;
     }
+    return false;
+}
+
+void LLGLTFPreviewTexture::preRender(BOOL clear_depth)
+{
+    LL_PROFILE_ZONE_SCOPED_CATEGORY_UI;
 
+    llassert(mShouldRender);
     if (!mShouldRender) { return; }
 
     LLViewerDynamicTexture::preRender(clear_depth);
-- 
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