Cycles: support for custom shader AOVs

Custom render passes are added in the Shader AOVs panel in the view layer
settings, with a name and data type. In shader nodes, an AOV Output node
is then used to output either a value or color to the pass.

Arbitrary names can be used for these passes, as long as they don't conflict
with built-in passes that are enabled. The AOV Output node can be used in both
material and world shader nodes.

Implemented by Lukas, with tweaks by Brecht.

Differential Revision: https://developer.blender.org/D4837

1 files changed, 20 insertions, 0 deletions

diff --git a/intern/cycles/render/nodes.h b/intern/cycles/render/nodes.h
index ae762f3db1c..54124cd2175 100644
--- a/intern/cycles/render/nodes.h
+++ b/intern/cycles/render/nodes.h
@@ -189,6 +189,26 @@ class OutputNode : public ShaderNode {
   }
 };
 
+class OutputAOVNode : public ShaderNode {
+ public:
+  SHADER_NODE_CLASS(OutputAOVNode)
+  virtual void simplify_settings(Scene *scene);
+
+  float value;
+  float3 color;
+
+  ustring name;
+
+  /* Don't allow output node de-duplication. */
+  virtual bool equals(const ShaderNode & /*other*/)
+  {
+    return false;
+  }
+
+  int slot;
+  bool is_color;
+};
+
 class GradientTextureNode : public TextureNode {
  public:
   SHADER_NODE_CLASS(GradientTextureNode)