Cycles: Enable QBVH optimization structure for SSE2 CPUs

This commit enables QBVH optimization structure automatically if rendering
with CPU and SSE2 support is detected.

This brings render time of agent shot back to the speed it used to be before
the watertight intersections commit, single koro and sponza scenes are about
7% faster here.

1 files changed, 8 insertions, 1 deletions

diff --git a/intern/cycles/blender/blender_sync.cpp b/intern/cycles/blender/blender_sync.cpp
index ee492dd00e4..f83eb113a88 100644
--- a/intern/cycles/blender/blender_sync.cpp
+++ b/intern/cycles/blender/blender_sync.cpp
@@ -353,7 +353,7 @@ void BlenderSync::sync_render_layers(BL::SpaceView3D b_v3d, const char *layer)
 
 /* Scene Parameters */
 
-SceneParams BlenderSync::get_scene_params(BL::Scene b_scene, bool background)
+SceneParams BlenderSync::get_scene_params(BL::Scene b_scene, bool background, bool is_cpu)
 {
 	BL::RenderSettings r = b_scene.render();
 	SceneParams params;
@@ -378,6 +378,13 @@ SceneParams BlenderSync::get_scene_params(BL::Scene b_scene, bool background)
 	else
 		params.persistent_data = false;
 
+	if(is_cpu) {
+		params.use_qbvh = system_cpu_support_sse2();
+	}
+	else {
+		params.use_qbvh = false;
+	}
+
 	return params;
 }