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, 22 insertions, 8 deletions

diff --git a/intern/cycles/kernel/kernels/cuda/kernel.cu b/intern/cycles/kernel/kernels/cuda/kernel.cu
index 8a180a509e8..af311027f78 100644
--- a/intern/cycles/kernel/kernels/cuda/kernel.cu
+++ b/intern/cycles/kernel/kernels/cuda/kernel.cu
@@ -40,14 +40,21 @@ CUDA_LAUNCH_BOUNDS(CUDA_THREADS_BLOCK_WIDTH, CUDA_KERNEL_MAX_REGISTERS)
 kernel_cuda_path_trace(WorkTile *tile, uint total_work_size)
 {
 	int work_index = ccl_global_id(0);
-
-	if(work_index < total_work_size) {
-		uint x, y, sample;
+	bool thread_is_active = work_index < total_work_size;
+	uint x, y, sample;
+	KernelGlobals kg;
+	if(thread_is_active) {
 		get_work_pixel(tile, work_index, &x, &y, &sample);
 
-		KernelGlobals kg;
 		kernel_path_trace(&kg, tile->buffer, sample, x, y, tile->offset, tile->stride);
 	}
+
+	if(kernel_data.film.cryptomatte_passes) {
+		__syncthreads();
+		if(thread_is_active) {
+			kernel_cryptomatte_post(&kg, tile->buffer, sample, x, y, tile->offset, tile->stride);
+		}
+	}
 }
 
 #ifdef __BRANCHED_PATH__
@@ -56,14 +63,21 @@ CUDA_LAUNCH_BOUNDS(CUDA_THREADS_BLOCK_WIDTH, CUDA_KERNEL_BRANCHED_MAX_REGISTERS)
 kernel_cuda_branched_path_trace(WorkTile *tile, uint total_work_size)
 {
 	int work_index = ccl_global_id(0);
-
-	if(work_index < total_work_size) {
-		uint x, y, sample;
+	bool thread_is_active = work_index < total_work_size;
+	uint x, y, sample;
+	KernelGlobals kg;
+	if(thread_is_active) {
 		get_work_pixel(tile, work_index, &x, &y, &sample);
 
-		KernelGlobals kg;
 		kernel_branched_path_trace(&kg, tile->buffer, sample, x, y, tile->offset, tile->stride);
 	}
+	
+	if(kernel_data.film.cryptomatte_passes) {
+		__syncthreads();
+		if(thread_is_active) {
+			kernel_cryptomatte_post(&kg, tile->buffer, sample, x, y, tile->offset, tile->stride);
+		}
+	}
 }
 #endif