[Bf-blender-cvs] [0d97c0dfa60] geometry-nodes: Geometry Nodes: use attribute span api in random attribute node

[Jacques Lucke]

Commit: 0d97c0dfa60696866a08014d962d39fd5881977e
Author: Jacques Lucke
Date:   Thu Nov 26 18:22:21 2020 +0100
Branches: geometry-nodes
https://developer.blender.org/rB0d97c0dfa60696866a08014d962d39fd5881977e

Geometry Nodes: use attribute span api in random attribute node

This results in a ~30% speedup. The execution time is bounded
by the random number generator here.

===================================================================

M	source/blender/nodes/geometry/nodes/node_geo_random_attribute.cc

===================================================================

diff --git a/source/blender/nodes/geometry/nodes/node_geo_random_attribute.cc b/source/blender/nodes/geometry/nodes/node_geo_random_attribute.cc
index 0eea9c221e4..68ea5481028 100644
--- a/source/blender/nodes/geometry/nodes/node_geo_random_attribute.cc
+++ b/source/blender/nodes/geometry/nodes/node_geo_random_attribute.cc
@@ -64,10 +64,12 @@ static void randomize_attribute(FloatWriteAttribute &attribute,
                                 float max,
                                 RandomNumberGenerator &rng)
 {
+  MutableSpan<float> attribute_span = attribute.get_span();
   for (const int i : IndexRange(attribute.size())) {
     const float value = rng.get_float() * (max - min) + min;
-    attribute.set(i, value);
+    attribute_span[i] = value;
   }
+  attribute.apply_span();
 }
 
 static void randomize_attribute(Float3WriteAttribute &attribute,
@@ -75,13 +77,15 @@ static void randomize_attribute(Float3WriteAttribute &attribute,
                                 float3 max,
                                 RandomNumberGenerator &rng)
 {
+  MutableSpan<float3> attribute_span = attribute.get_span();
   for (const int i : IndexRange(attribute.size())) {
     const float x = rng.get_float();
     const float y = rng.get_float();
     const float z = rng.get_float();
     const float3 value = float3(x, y, z) * (max - min) + min;
-    attribute.set(i, value);
+    attribute_span[i] = value;
   }
+  attribute.apply_span();
 }
 
 static void randomize_attribute(GeometryComponent &component,