Shading: Add More Features To The Voronoi Node.

This patch allows the Voronoi node to operate in 1D, 2D, and 4D space.
It also adds a Randomness input to control the randomness of the texture.
Additionally, it adds three new modes of operation:

- Smooth F1: A smooth version of F1 Voronoi with no discontinuities.
- Distance To Edge: Returns the distance to the edges of the cells.
- N-Sphere Radius: Returns the radius of the n-sphere inscribed in
the cells. In other words, it is half the distance between the
closest feature point and the feature point closest to it.

And it removes the following three modes of operation:

- F3.
- F4.
- Cracks.

The Distance metric is now called Euclidean, and it computes the actual
euclidean distance as opposed to the old method of computing the squared
euclidean distance.

This breaks backward compatibility in many ways, including the base case.

Reviewers: brecht, JacquesLucke

Differential Revision: https://developer.blender.org/D5743

1 files changed, 17 insertions, 15 deletions

diff --git a/source/blender/makesdna/DNA_node_types.h b/source/blender/makesdna/DNA_node_types.h
index b4e12484bdc..6b46c5887b4 100644
--- a/source/blender/makesdna/DNA_node_types.h
+++ b/source/blender/makesdna/DNA_node_types.h
@@ -876,10 +876,10 @@ typedef struct NodeTexNoise {
 
 typedef struct NodeTexVoronoi {
   NodeTexBase base;
-  int coloring;
-  int distance;
+  int dimensions;
   int feature;
-  char _pad[4];
+  int distance;
+  int coloring DNA_DEPRECATED;
 } NodeTexVoronoi;
 
 typedef struct NodeTexMusgrave {
@@ -1098,20 +1098,22 @@ typedef struct NodeDenoise {
 #define SHD_NOISE_SOFT 0
 #define SHD_NOISE_HARD 1
 
-/* voronoi texture */
-#define SHD_VORONOI_DISTANCE 0
-#define SHD_VORONOI_MANHATTAN 1
-#define SHD_VORONOI_CHEBYCHEV 2
-#define SHD_VORONOI_MINKOWSKI 3
+/* Voronoi Texture */
 
-#define SHD_VORONOI_INTENSITY 0
-#define SHD_VORONOI_CELLS 1
+enum {
+  SHD_VORONOI_EUCLIDEAN = 0,
+  SHD_VORONOI_MANHATTAN = 1,
+  SHD_VORONOI_CHEBYCHEV = 2,
+  SHD_VORONOI_MINKOWSKI = 3,
+};
 
-#define SHD_VORONOI_F1 0
-#define SHD_VORONOI_F2 1
-#define SHD_VORONOI_F3 2
-#define SHD_VORONOI_F4 3
-#define SHD_VORONOI_F2F1 4
+enum {
+  SHD_VORONOI_F1 = 0,
+  SHD_VORONOI_F2 = 1,
+  SHD_VORONOI_SMOOTH_F1 = 2,
+  SHD_VORONOI_DISTANCE_TO_EDGE = 3,
+  SHD_VORONOI_N_SPHERE_RADIUS = 4,
+};
 
 /* musgrave texture */
 #define SHD_MUSGRAVE_MULTIFRACTAL 0