Particles: Add utility function to copy particles from one system to another

1 files changed, 45 insertions, 0 deletions

diff --git a/source/blender/blenkernel/intern/particle.c b/source/blender/blenkernel/intern/particle.c
index 41445492c04..9461b0a21a5 100644
--- a/source/blender/blenkernel/intern/particle.c
+++ b/source/blender/blenkernel/intern/particle.c
@@ -653,6 +653,51 @@ void psys_free(Object *ob, ParticleSystem *psys)
 	}
 }
 
+void psys_copy_particles(ParticleSystem *psys_dst, ParticleSystem *psys_src)
+{
+	/* Free existing particles. */
+	if (psys_dst->particles != psys_src->particles) {
+		psys_free_particles(psys_dst);
+	}
+	if (psys_dst->child != psys_src->child) {
+		psys_free_children(psys_dst);
+	}
+	/* Restore counters. */
+	psys_dst->totpart = psys_src->totpart;
+	psys_dst->totchild = psys_src->totchild;
+	/* Copy particles and children. */
+	psys_dst->particles = MEM_dupallocN(psys_src->particles);
+	psys_dst->child = MEM_dupallocN(psys_src->child);
+	if (psys_dst->part->type == PART_HAIR) {
+		ParticleData *pa;
+		int p;
+		for (p = 0, pa = psys_dst->particles; p < psys_dst->totpart; p++, pa++) {
+			pa->hair = MEM_dupallocN(pa->hair);
+		}
+	}
+	if (psys_dst->particles && (psys_dst->particles->keys || psys_dst->particles->boid)) {
+		ParticleKey *key = psys_dst->particles->keys;
+		BoidParticle *boid = psys_dst->particles->boid;
+		ParticleData *pa;
+		int p;
+		if (key != NULL) {
+			key = MEM_dupallocN(key);
+		}
+		if (boid != NULL) {
+			boid = MEM_dupallocN(boid);
+		}
+		for (p = 0, pa = psys_dst->particles; p < psys_dst->totpart; p++, pa++) {
+			if (boid != NULL) {
+				pa->boid = boid++;
+			}
+			if (key != NULL) {
+				pa->keys = key;
+				key += pa->totkey;
+			}
+		}
+	}
+}
+
 /************************************************/
 /*			Interpolation						*/
 /************************************************/