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, 9 insertions, 0 deletions

diff --git a/intern/cycles/kernel/kernel_types.h b/intern/cycles/kernel/kernel_types.h
index 7306c32d7c8..c35e345763a 100644
--- a/intern/cycles/kernel/kernel_types.h
+++ b/intern/cycles/kernel/kernel_types.h
@@ -222,6 +222,8 @@ typedef enum ShaderEvalType {
   SHADER_EVAL_TRANSMISSION_COLOR,
   SHADER_EVAL_SUBSURFACE_COLOR,
   SHADER_EVAL_EMISSION,
+  SHADER_EVAL_AOV_COLOR,
+  SHADER_EVAL_AOV_VALUE,
 
   /* light passes */
   SHADER_EVAL_AO,
@@ -371,6 +373,8 @@ typedef enum PassType {
 #endif
   PASS_RENDER_TIME,
   PASS_CRYPTOMATTE,
+  PASS_AOV_COLOR,
+  PASS_AOV_VALUE,
   PASS_CATEGORY_MAIN_END = 31,
 
   PASS_MIST = 32,
@@ -1244,6 +1248,11 @@ typedef struct KernelFilm {
   int pass_denoising_clean;
   int denoising_flags;
 
+  int pass_aov_color;
+  int pass_aov_value;
+  int pad1;
+  int pad2;
+
   /* XYZ to rendering color space transform. float4 instead of float3 to
    * ensure consistent padding/alignment across devices. */
   float4 xyz_to_r;