Shading: Add White Noise node.

The White Noise node hashes the input and returns a random number in the
range [0, 1]. The input can be a 1D, 2D, 3D, or a 4D vector.

Reviewers: brecht, JacquesLucke

Differential Revision: https://developer.blender.org/D5550

2 files changed, 40 insertions, 0 deletions

diff --git a/intern/cycles/kernel/shaders/CMakeLists.txt b/intern/cycles/kernel/shaders/CMakeLists.txt
index 63cef6e841b..c50bffe27b2 100644
--- a/intern/cycles/kernel/shaders/CMakeLists.txt
+++ b/intern/cycles/kernel/shaders/CMakeLists.txt
@@ -85,6 +85,7 @@ set(SRC_OSL
   node_wavelength.osl
   node_blackbody.osl
   node_wave_texture.osl
+  node_white_noise_texture.osl
   node_wireframe.osl
   node_hair_bsdf.osl
   node_principled_hair_bsdf.osl
diff --git a/intern/cycles/kernel/shaders/node_white_noise_texture.osl b/intern/cycles/kernel/shaders/node_white_noise_texture.osl
new file mode 100644
index 00000000000..f026fb4ab39
--- /dev/null
+++ b/intern/cycles/kernel/shaders/node_white_noise_texture.osl
@@ -0,0 +1,39 @@
+/*
+ * 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_white_noise_texture(string dimensions = "3D",
+                                point Vector = point(0.0, 0.0, 0.0),
+                                float W = 0.0,
+                                output float Value = 0.0)
+{
+  if (dimensions == "1D") {
+    Value = noise("hash", W);
+  }
+  else if (dimensions == "2D") {
+    Value = noise("hash", Vector[0], Vector[1]);
+  }
+  else if (dimensions == "3D") {
+    Value = noise("hash", Vector);
+  }
+  else if (dimensions == "4D") {
+    Value = noise("hash", Vector, W);
+  }
+  else {
+    warning("%s", "Unknown dimension!");
+  }
+}