Cycles: per render layer Samples control, leaving it to 0 will use the common

scene setting.

intern/cycles/blender/addon/ui.py

@@ -192,6 +192,7 @@ class CyclesRender_PT_layers(CyclesButtonsPanel, Panel):
         col.prop(rl, "material_override", text="")
 
         col = split.column()
+        col.prop(rl, "samples")
         col.prop(rl, "use_sky", "Use Environment")
 
         split = layout.split()

intern/cycles/blender/blender_session.cpp

@@ -218,12 +218,13 @@ void BlenderSession::render()
 		scene->film->passes = passes;
 		scene->film->tag_update(scene);
 
-		/* update session */
-		session->reset(buffer_params, session_params.samples);
-
 		/* update scene */
 		sync->sync_data(b_v3d, b_iter->name().c_str());
 
+		/* update session */
+		int samples = sync->get_layer_samples();
+		session->reset(buffer_params, (samples == 0)? session_params.samples: samples);
+
 		/* render */
 		session->start();
 		session->wait();

intern/cycles/blender/blender_sync.cpp

@@ -210,6 +210,7 @@ void BlenderSync::sync_render_layers(BL::SpaceView3D b_v3d, const char *layer)
 			render_layer.holdout_layer = 0;
 			render_layer.material_override = PointerRNA_NULL;
 			render_layer.use_background = true;
+			render_layer.samples = 0;
 			return;
 		}
 	}
@@ -228,6 +229,7 @@ void BlenderSync::sync_render_layers(BL::SpaceView3D b_v3d, const char *layer)
 			render_layer.layer |= render_layer.holdout_layer;
 			render_layer.material_override = b_rlay->material_override();
 			render_layer.use_background = b_rlay->use_sky();
+			render_layer.samples = b_rlay->samples();
 		}
 
 		first_layer = false;

intern/cycles/blender/blender_sync.h

@@ -57,6 +57,7 @@ public:
 	void sync_data(BL::SpaceView3D b_v3d, const char *layer = 0);
 	void sync_camera(BL::Object b_override, int width, int height);
 	void sync_view(BL::SpaceView3D b_v3d, BL::RegionView3D b_rv3d, int width, int height);
+	int get_layer_samples() { return render_layer.samples; }
 
 	/* get parameters */
 	static SceneParams get_scene_params(BL::Scene b_scene, bool background);
@@ -108,7 +109,8 @@ private:
 		RenderLayerInfo()
 		: scene_layer(0), layer(0), holdout_layer(0),
 		  material_override(PointerRNA_NULL),
-		  use_background(true)
+		  use_background(true),
+		  samples(0)
 		{}
 
 		string name;
@@ -117,6 +119,7 @@ private:
 		uint holdout_layer;
 		BL::Material material_override;
 		bool use_background;
+		int samples;
 	} render_layer;
 };
 

source/blender/makesdna/DNA_scene_types.h

@@ -183,6 +183,9 @@ typedef struct SceneRenderLayer {
 	
 	int passflag;			/* pass_xor has to be after passflag */
 	int pass_xor;
+
+	int samples;
+	int pad;
 } SceneRenderLayer;
 
 /* srl->layflag */

source/blender/makesrna/intern/rna_scene.c

@@ -1912,6 +1912,12 @@ void rna_def_render_layer_common(StructRNA *srna, int scene)
 	if (scene) RNA_def_property_update(prop, NC_SCENE|ND_RENDER_OPTIONS, "rna_Scene_glsl_update");
 	else RNA_def_property_clear_flag(prop, PROP_EDITABLE);
 
+	if(scene) {
+		prop = RNA_def_property(srna, "samples", PROP_INT, PROP_UNSIGNED);
+		RNA_def_property_ui_text(prop, "Samples", "Override number of render samples for this render layer, 0 will use the scene setting");
+		RNA_def_property_update(prop, NC_SCENE|ND_RENDER_OPTIONS, NULL);
+	}
+
 	/* layer options */
 	prop = RNA_def_property(srna, "use", PROP_BOOLEAN, PROP_NONE);
 	RNA_def_property_boolean_negative_sdna(prop, NULL, "layflag", SCE_LAY_DISABLE);