Cycles: Added Cryptomatte output.

This allows for extra output passes that encode automatic object and material masks
for the entire scene. It is an implementation of the Cryptomatte standard as
introduced by Psyop. A good future extension would be to add a manifest to the
export and to do plenty of testing to ensure that it is fully compatible with other
renderers and compositing programs that use Cryptomatte.

Internally, it adds the ability for Cycles to have several passes of the same type
that are distinguished by their name.

Differential Revision: https://developer.blender.org/D3538

1 files changed, 8 insertions, 0 deletions

diff --git a/intern/cycles/kernel/kernel_globals.h b/intern/cycles/kernel/kernel_globals.h
index 74cfacb5bc1..37402f42863 100644
--- a/intern/cycles/kernel/kernel_globals.h
+++ b/intern/cycles/kernel/kernel_globals.h
@@ -21,6 +21,7 @@
 
 #ifdef __KERNEL_CPU__
 #  include "util/util_vector.h"
+#  include "util/util_map.h"
 #endif
 
 #ifdef __KERNEL_OPENCL__
@@ -42,6 +43,8 @@ struct OSLThreadData;
 struct OSLShadingSystem;
 #  endif
 
+typedef unordered_map<float, float> CoverageMap;
+
 struct Intersection;
 struct VolumeStep;
 
@@ -68,6 +71,11 @@ typedef struct KernelGlobals {
 	VolumeStep *decoupled_volume_steps[2];
 	int decoupled_volume_steps_index;
 
+	/* A buffer for storing per-pixel coverage for Cryptomatte. */
+	CoverageMap *coverage_object;
+	CoverageMap *coverage_material;
+	CoverageMap *coverage_asset;
+
 	/* split kernel */
 	SplitData split_data;
 	SplitParams split_param_data;