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, 2 insertions, 0 deletions

diff --git a/source/blender/blenkernel/BKE_node.h b/source/blender/blenkernel/BKE_node.h
index 8a107aac538..4094930d321 100644
--- a/source/blender/blenkernel/BKE_node.h
+++ b/source/blender/blenkernel/BKE_node.h
@@ -976,6 +976,7 @@ void BKE_nodetree_remove_layer_n(struct bNodeTree *ntree,
 #define SH_NODE_VOLUME_PRINCIPLED 200
 /* 201..700 occupied by other node types, continue from 701 */
 #define SH_NODE_BSDF_HAIR_PRINCIPLED 701
+#define SH_NODE_MAP_RANGE 702
 
 /* custom defines options for Material node */
 #define SH_NODE_MAT_DIFF 1
diff --git a/source/blender/blenkernel/intern/node.c b/source/blender/blenkernel/intern/node.c
index 775f6eb37a7..730af681014 100644
--- a/source/blender/blenkernel/intern/node.c
+++ b/source/blender/blenkernel/intern/node.c
@@ -3856,6 +3856,7 @@ static void registerShaderNodes(void)
   register_node_type_sh_mapping();
   register_node_type_sh_curve_vec();
   register_node_type_sh_curve_rgb();
+  register_node_type_sh_map_range();
   register_node_type_sh_math();
   register_node_type_sh_vect_math();
   register_node_type_sh_vect_transform();