From 80e137e826cac408e66d79d16db44d732e117b01 Mon Sep 17 00:00:00 2001
From: Brecht Van Lommel <brechtvanlommel@gmail.com>
Date: Tue, 6 May 2014 16:39:28 +0200
Subject: [PATCH] Fix T39946: OSL + tangent space normal maps not working in
 Cycles.

---
 intern/cycles/kernel/osl/osl_services.cpp | 13 ++++++++++++-
 intern/cycles/kernel/osl/osl_services.h   |  1 +
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/intern/cycles/kernel/osl/osl_services.cpp b/intern/cycles/kernel/osl/osl_services.cpp
index f33d032b9d3..54894ea19eb 100644
--- a/intern/cycles/kernel/osl/osl_services.cpp
+++ b/intern/cycles/kernel/osl/osl_services.cpp
@@ -59,6 +59,7 @@ CCL_NAMESPACE_BEGIN
 /* static ustrings */
 ustring OSLRenderServices::u_distance("distance");
 ustring OSLRenderServices::u_index("index");
+ustring OSLRenderServices::u_world("world");
 ustring OSLRenderServices::u_camera("camera");
 ustring OSLRenderServices::u_screen("screen");
 ustring OSLRenderServices::u_raster("raster");
@@ -209,6 +210,10 @@ bool OSLRenderServices::get_matrix(OSL::Matrix44 &result, ustring from, float ti
 		COPY_MATRIX44(&result, &tfm);
 		return true;
 	}
+	else if (from == u_world) {
+		result.makeIdentity();
+		return true;
+	}
 
 	return false;
 }
@@ -237,6 +242,10 @@ bool OSLRenderServices::get_inverse_matrix(OSL::Matrix44 &result, ustring to, fl
 		COPY_MATRIX44(&result, &tfm);
 		return true;
 	}
+	else if (to == u_world) {
+		result.makeIdentity();
+		return true;
+	}
 
 	return false;
 }
@@ -781,7 +790,9 @@ bool OSLRenderServices::get_attribute(void *renderstate, bool derivatives, ustri
 
 		if (attr.elem != ATTR_ELEMENT_OBJECT) {
 			/* triangle and vertex attributes */
-			if(!get_mesh_element_attribute(kg, sd, attr, type, derivatives, val))
+			if(get_mesh_element_attribute(kg, sd, attr, type, derivatives, val))
+				return true;
+			else
 				return get_mesh_attribute(kg, sd, attr, type, derivatives, val);
 		}
 		else {
diff --git a/intern/cycles/kernel/osl/osl_services.h b/intern/cycles/kernel/osl/osl_services.h
index 54ddd7a98b4..069722d81b6 100644
--- a/intern/cycles/kernel/osl/osl_services.h
+++ b/intern/cycles/kernel/osl/osl_services.h
@@ -116,6 +116,7 @@ public:
 
 	static ustring u_distance;
 	static ustring u_index;
+	static ustring u_world;
 	static ustring u_camera;
 	static ustring u_screen;
 	static ustring u_raster;