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

1 files changed, 11 insertions, 0 deletions

diff --git a/intern/cycles/render/nodes.h b/intern/cycles/render/nodes.h
index 6b21be88663..13c096a00c2 100644
--- a/intern/cycles/render/nodes.h
+++ b/intern/cycles/render/nodes.h
@@ -1228,6 +1228,17 @@ class BlackbodyNode : public ShaderNode {
   float temperature;
 };
 
+class MapRangeNode : public ShaderNode {
+ public:
+  SHADER_NODE_CLASS(MapRangeNode)
+  void constant_fold(const ConstantFolder &folder);
+  virtual int get_group()
+  {
+    return NODE_GROUP_LEVEL_3;
+  }
+  float value, from_min, from_max, to_min, to_max;
+};
+
 class MathNode : public ShaderNode {
  public:
   SHADER_NODE_CLASS(MathNode)