1 files changed, 58 insertions, 0 deletions
diff --git a/intern/cycles/kernel/osl/shaders/node_map_range.osl b/intern/cycles/kernel/osl/shaders/node_map_range.osl
new file mode 100644
index 00000000000..2fcc664a80e
--- /dev/null
+++ b/intern/cycles/kernel/osl/shaders/node_map_range.osl
@@ -0,0 +1,58 @@
+/*
+ * Copyright 2011-2013 Blender Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "stdcycles.h"
+
+float safe_divide(float a, float b)
+{
+  return (b != 0.0) ? a / b : 0.0;
+}
+
+float smootherstep(float edge0, float edge1, float x)
+{
+  float t = clamp(safe_divide((x - edge0), (edge1 - edge0)), 0.0, 1.0);
+  return t * t * t * (t * (t * 6.0 - 15.0) + 10.0);
+}
+
+shader node_map_range(string range_type = "linear",
+                      float Value = 1.0,
+                      float FromMin = 0.0,
+                      float FromMax = 1.0,
+                      float ToMin = 0.0,
+                      float ToMax = 1.0,
+                      float Steps = 4.0,
+                      output float Result = 0.0)
+{
+  if (FromMax != FromMin) {
+    float Factor = Value;
+    if (range_type == "stepped") {
+      Factor = (Value - FromMin) / (FromMax - FromMin);
+      Factor = (Steps > 0) ? floor(Factor * (Steps + 1.0)) / Steps : 0.0;
+    }
+    else if (range_type == "smoothstep") {
+      Factor = (FromMin > FromMax) ? 1.0 - smoothstep(FromMax, FromMin, Value) :
+                                     smoothstep(FromMin, FromMax, Value);
+    }
+    else if (range_type == "smootherstep") {
+      Factor = (FromMin > FromMax) ? 1.0 - smootherstep(FromMax, FromMin, Value) :
+                                     smootherstep(FromMin, FromMax, Value);
+    }
+    else {
+      Factor = (Value - FromMin) / (FromMax - FromMin);
+    }
+    Result = ToMin + Factor * (ToMax - ToMin);
+  }
+}