Cycles OSL: refactoring and fixes

* Moved kernel/osl/nodes to kernel/shaders
* Renamed standard attributes to use geom:, particle:, object: prefixes
* Update stdosl.h to properly reflect the closures we support
* Fix the wrong stdosl.h being used for building shaders
* Add geom:numpolyvertices, geom:trianglevertices, geom:polyvertices attributes

intern/cycles/kernel/shaders/node_bump.osl

@@ -0,0 +1,49 @@
+/*
+ * Copyright 2011, Blender Foundation.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#include "stdosl.h"
+
+/* "Bump Mapping Unparameterized Surfaces on the GPU"
+ * Morten S. Mikkelsen, 2010 */
+
+surface node_bump(
+	normal NormalIn = N,
+	float Strength = 0.0,
+	float SampleCenter = 0.0,
+	float SampleX = 0.0,
+	float SampleY = 0.0,
+	output normal Normal = N)
+{
+	/* get surface tangents from normal */
+	vector dPdx = Dx(P);
+	vector dPdy = Dy(P);
+
+	vector Rx = cross(dPdy, NormalIn);
+	vector Ry = cross(NormalIn, dPdx);
+
+	/* compute surface gradient and determinant */
+	float det = dot(dPdx, Rx);
+	vector surfgrad = (SampleX - SampleCenter) * Rx + (SampleY - SampleCenter) * Ry;
+
+	surfgrad *= Strength;
+	float absdet = fabs(det);
+	
+	/* compute and output perturbed normal */
+	Normal = normalize(absdet * NormalIn - sign(det) * surfgrad);
+}
+