1 files changed, 26 insertions, 0 deletions
diff --git a/Source/Core/VideoCommon/VertexManagerBase.cpp b/Source/Core/VideoCommon/VertexManagerBase.cpp
index a93a9b34f1..bb23a468ea 100644
--- a/Source/Core/VideoCommon/VertexManagerBase.cpp
+++ b/Source/Core/VideoCommon/VertexManagerBase.cpp
@@ -453,6 +453,7 @@ void VertexManagerBase::Flush()
     }
   }
 
+  CalculateBinormals(VertexLoaderManager::GetCurrentVertexFormat());
   // Calculate ZSlope for zfreeze
   VertexShaderManager::SetConstants();
   if (!bpmem.genMode.zfreeze)
@@ -595,6 +596,31 @@ void VertexManagerBase::CalculateZSlope(NativeVertexFormat* format)
   m_zslope.dirty = true;
 }
 
+void VertexManagerBase::CalculateBinormals(NativeVertexFormat* format)
+{
+  const PortableVertexDeclaration vert_decl = format->GetVertexDeclaration();
+
+  // Only update the binormal/tangent vertex shader constants if the vertex format lacks binormals
+  // (VertexLoaderManager::binormal_cache gets updated by the vertex loader when binormals are
+  // present, though)
+  if (vert_decl.normals[1].enable)
+    return;
+
+  VertexLoaderManager::tangent_cache[3] = 0;
+  VertexLoaderManager::binormal_cache[3] = 0;
+
+  if (VertexShaderManager::constants.cached_tangent != VertexLoaderManager::tangent_cache)
+  {
+    VertexShaderManager::constants.cached_tangent = VertexLoaderManager::tangent_cache;
+    VertexShaderManager::dirty = true;
+  }
+  if (VertexShaderManager::constants.cached_binormal != VertexLoaderManager::binormal_cache)
+  {
+    VertexShaderManager::constants.cached_binormal = VertexLoaderManager::binormal_cache;
+    VertexShaderManager::dirty = true;
+  }
+}
+
 void VertexManagerBase::UpdatePipelineConfig()
 {
   NativeVertexFormat* vertex_format = VertexLoaderManager::GetCurrentVertexFormat();