Compositor: Add OIDN prefiltering option to Denoise node

It's equivalent to the OpenImageDenoise prefiltering option in Cycles.
See D12043.

Prefilter modes:
- None: No prefiltering, use when guiding passes are noise-free.
- Fast: Denoise image and guiding passes together. Improves quality when
guiding passes are noisy using least amount of extra processing time.
- Accurate: Prefilter noisy guiding passes before denoising image.
Improves quality when guiding passes are noisy using extra
processing time.

Reviewed By: #compositing, jbakker, sergey

Differential Revision: https://developer.blender.org/D12342

1 files changed, 1 insertions, 0 deletions

diff --git a/source/blender/nodes/composite/nodes/node_composite_denoise.c b/source/blender/nodes/composite/nodes/node_composite_denoise.c
index 040b350627e..e2c7c7b995f 100644
--- a/source/blender/nodes/composite/nodes/node_composite_denoise.c
+++ b/source/blender/nodes/composite/nodes/node_composite_denoise.c
@@ -36,6 +36,7 @@ static void node_composit_init_denonise(bNodeTree *UNUSED(ntree), bNode *node)
 {
   NodeDenoise *ndg = MEM_callocN(sizeof(NodeDenoise), "node denoise data");
   ndg->hdr = true;
+  ndg->prefilter = CMP_NODE_DENOISE_PREFILTER_ACCURATE;
   node->storage = ndg;
 }