2 files changed, 49 insertions, 0 deletions
diff --git a/indra/llprimitive/llmaterial.cpp b/indra/llprimitive/llmaterial.cpp
index f6fd8e557a..7d1ce4ab86 100644
--- a/indra/llprimitive/llmaterial.cpp
+++ b/indra/llprimitive/llmaterial.cpp
@@ -181,3 +181,36 @@ bool LLMaterial::operator != (const LLMaterial& rhs) const
 {
 	return !(*this == rhs);
 }
+
+
+U32 LLMaterial::getShaderMask()
+{ //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"
+	ret = getDiffuseAlphaMode();
+
+	llassert(ret < SHADER_COUNT);
+
+	//next bit is whether or not specular map is present
+	const U32 SPEC_BIT = 0x4;
+
+	if (getSpecularID().notNull())
+	{
+		ret |= SPEC_BIT;
+	}
+
+	llassert(ret < SHADER_COUNT);
+	
+	//next bit is whether or not normal map is present
+	const U32 NORM_BIT = 0x8;
+	if (getNormalID().notNull())
+	{
+		ret |= NORM_BIT;
+	}
+
+	llassert(ret < SHADER_COUNT);
+
+	return ret;
+}
+
diff --git a/indra/llprimitive/llmaterial.h b/indra/llprimitive/llmaterial.h
index 5b56d11cd2..fd35045e45 100644
--- a/indra/llprimitive/llmaterial.h
+++ b/indra/llprimitive/llmaterial.h
@@ -36,6 +36,20 @@
 class LLMaterial
 {
 public:
+
+	typedef enum
+	{
+		DIFFUSE_ALPHA_MODE_NONE = 0,
+		DIFFUSE_ALPHA_MODE_BLEND = 1,
+		DIFFUSE_ALPHA_MODE_MASK = 2,
+		DIFFUSE_ALPHA_MODE_EMISSIVE = 3
+	} eDiffuseAlphaMode;
+
+	typedef enum
+	{
+		SHADER_COUNT = 16
+	} eShaderCount;
+	
 	LLMaterial();
 	LLMaterial(const LLSD& material_data);
 
@@ -77,6 +91,8 @@ public:
 	bool		operator == (const LLMaterial& rhs) const;
 	bool		operator != (const LLMaterial& rhs) const;
 
+	U32			getShaderMask();
+
 protected:
 	LLUUID		mNormalID;
 	F32			mNormalOffsetX;