Random number generator: replace a bunch of usage of the global random number

generator with a local one. It's not thread safe and will not give repeatable
results, so in most cases it should not be used.

Also fixes #34992 where the noise texture of a displacement modifier was not
properly random in opengl animation render, because the seed got reset to a
fixed value by an unrelated function while for final render it changed each
frame.

1 files changed, 4 insertions, 0 deletions

diff --git a/source/blender/blenkernel/BKE_boids.h b/source/blender/blenkernel/BKE_boids.h
index bb724c6632e..582cd0cef8d 100644
--- a/source/blender/blenkernel/BKE_boids.h
+++ b/source/blender/blenkernel/BKE_boids.h
@@ -36,6 +36,8 @@
 
 #include "DNA_boid_types.h"
 
+struct RNG;
+
 typedef struct BoidBrainData {
 	struct ParticleSimulationData *sim;
 	struct ParticleSettings *part;
@@ -47,6 +49,8 @@ typedef struct BoidBrainData {
 	float goal_co[3];
 	float goal_nor[3];
 	float goal_priority;
+
+	struct RNG *rng;
 } BoidBrainData;
 
 void boids_precalc_rules(struct ParticleSettings *part, float cfra);