Merge remote-tracking branch 'origin/main' into DRTVWR-559

1 files changed, 9 insertions, 9 deletions

diff --git a/indra/llprimitive/llmaterial.cpp b/indra/llprimitive/llmaterial.cpp
index 37525e4a3d..f6cb3c8b70 100644
--- a/indra/llprimitive/llmaterial.cpp
+++ b/indra/llprimitive/llmaterial.cpp
@@ -438,18 +438,18 @@ bool LLMaterial::operator != (const LLMaterial& rhs) const
 }
 
 
-U32 LLMaterial::getShaderMask(U32 alpha_mode)
+U32 LLMaterial::getShaderMask(U32 alpha_mode, BOOL is_alpha)
 { //NEVER incorporate this value into the message system -- this function will vary depending on viewer implementation
-    U32 ret = 0;
 
-    //two least significant bits are "diffuse alpha mode"
-    if (alpha_mode != DIFFUSE_ALPHA_MODE_DEFAULT)
+	//two least significant bits are "diffuse alpha mode"
+	U32 ret = alpha_mode;
+    if (ret == DIFFUSE_ALPHA_MODE_DEFAULT)
     {
-        ret = alpha_mode;
-    }
-    else
-    {
-        ret = getDiffuseAlphaMode();
+		ret = getDiffuseAlphaMode();
+		if (ret == DIFFUSE_ALPHA_MODE_BLEND && !is_alpha)
+		{
+			ret = DIFFUSE_ALPHA_MODE_NONE;
+		}
     }
 
     llassert(ret < SHADER_COUNT);