Shading: Add Map Range node to Cycles and EEVEE.

This patch adds a new Map Range node that linearly remaps an input
value from a range to another. This node is similar to the compositor's
Map Range node.

Reviewers: brecht, JacquesLucke

Differential Revision: https://developer.blender.org/D5471

2 files changed, 26 insertions, 0 deletions

diff --git a/intern/cycles/kernel/shaders/CMakeLists.txt b/intern/cycles/kernel/shaders/CMakeLists.txt
index b42b9b2fe64..2a84d89f9be 100644
--- a/intern/cycles/kernel/shaders/CMakeLists.txt
+++ b/intern/cycles/kernel/shaders/CMakeLists.txt
@@ -46,6 +46,7 @@ set(SRC_OSL
   node_light_falloff.osl
   node_light_path.osl
   node_magic_texture.osl
+  node_map_range.osl
   node_mapping.osl
   node_math.osl
   node_mix.osl
diff --git a/intern/cycles/kernel/shaders/node_map_range.osl b/intern/cycles/kernel/shaders/node_map_range.osl
new file mode 100644
index 00000000000..417d2ae50a8
--- /dev/null
+++ b/intern/cycles/kernel/shaders/node_map_range.osl
@@ -0,0 +1,25 @@
+/*
+ * 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 "stdosl.h"
+
+shader node_map_range(float Value = 1.0, float FromMin = 0.0, float FromMax = 1.0,
+                      float ToMin = 0.0, float ToMax = 1.0, output float Result = 0.0)
+{
+  if (FromMax != FromMin) {
+    Result = ToMin + ((Value - FromMin) / (FromMax - FromMin)) * (ToMax - ToMin);
+  }
+}