Geometry Nodes: Accumulate Fields Node

This function node creates a running total of a given Vector, Float, or
Int field.

Inputs:
  - Value: The field to be accumulated
  - Group Index: The values of this input are used to aggregate the input
    into separate 'bins', creating multiple accumulations.
Outputs:
  - Leading and Trailing: Returns the running totals starting
   at either the first value of each accumulations or 0 respectively.
  - Total: Returns the total accumulation at all positions of the field.

There's currently plenty of duplicate work happening when multiple outputs
are used that could be optimized by a future refactor to field inputs.

Differential Revision: https://developer.blender.org/D12743

1 files changed, 10 insertions, 0 deletions

diff --git a/source/blender/blenlib/BLI_hash.hh b/source/blender/blenlib/BLI_hash.hh
index 11ff7d040aa..9132aacf7b9 100644
--- a/source/blender/blenlib/BLI_hash.hh
+++ b/source/blender/blenlib/BLI_hash.hh
@@ -243,6 +243,16 @@ uint64_t get_default_hash_3(const T1 &v1, const T2 &v2, const T3 &v3)
   return h1 ^ (h2 * 19349669) ^ (h3 * 83492791);
 }
 
+template<typename T1, typename T2, typename T3, typename T4>
+uint64_t get_default_hash_4(const T1 &v1, const T2 &v2, const T3 &v3, const T4 &v4)
+{
+  const uint64_t h1 = get_default_hash(v1);
+  const uint64_t h2 = get_default_hash(v2);
+  const uint64_t h3 = get_default_hash(v3);
+  const uint64_t h4 = get_default_hash(v4);
+  return h1 ^ (h2 * 19349669) ^ (h3 * 83492791) ^ (h4 * 3632623);
+}
+
 template<typename T> struct DefaultHash<std::unique_ptr<T>> {
   uint64_t operator()(const std::unique_ptr<T> &value) const
   {