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_checker_texture.osl

@@ -0,0 +1,58 @@
+/*
+ * Copyright 2012, 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"
+#include "node_texture.h"
+
+/* Checker */
+
+float checker(point p)
+{
+	p[0] = (p[0] + 0.00001) * 0.9999;
+	p[1] = (p[1] + 0.00001) * 0.9999;
+	p[2] = (p[2] + 0.00001) * 0.9999;
+	
+	int xi = (int)fabs(floor(p[0]));
+	int yi = (int)fabs(floor(p[1]));
+	int zi = (int)fabs(floor(p[2]));
+
+	if ((xi % 2 == yi % 2) == (zi % 2)) {
+		return 1.0;
+	}
+	else {
+		return 0.0;
+	}
+}
+
+shader node_checker_texture(
+	float Scale = 5.0,
+	point Vector = P,
+	color Color1 = color(0.8, 0.8, 0.8),
+	color Color2 = color(0.2, 0.2, 0.2),
+	output float Fac = 0.0,
+	output color Color = color(0.0, 0.0, 0.0))
+{
+	Fac = checker(Vector * Scale);
+	if (Fac == 1.0) {
+		Color = Color1;
+	}
+	else {
+		Color = Color2;
+	}
+}
+