SL-18837: Merge branch 'main' of secondlife/viewer into actions

1 files changed, 9 insertions, 9 deletions

diff --git a/indra/llprimitive/llmaterial.cpp b/indra/llprimitive/llmaterial.cpp
index a219ac1450..fa22145972 100644
--- a/indra/llprimitive/llmaterial.cpp
+++ b/indra/llprimitive/llmaterial.cpp
@@ -426,18 +426,18 @@ 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);