Cycles: Selectively include denoising in kernel

intern/cycles/device/device.cpp

@@ -68,6 +68,8 @@ std::ostream& operator <<(std::ostream &os,
 	   << string_from_bool(requested_features.use_transparent) << std::endl;
 	os << "Use Principled BSDF: "
 	   << string_from_bool(requested_features.use_principled) << std::endl;
+	os << "Use Denoising: "
+	   << string_from_bool(requested_features.use_denoising) << std::endl;
 	return os;
 }
 

intern/cycles/device/device.h

@@ -127,6 +127,9 @@ public:
 	/* Per-uber shader usage flags. */
 	bool use_principled;
 
+	/* Denoising features. */
+	bool use_denoising;
+
 	DeviceRequestedFeatures()
 	{
 		/* TODO(sergey): Find more meaningful defaults. */
@@ -145,6 +148,7 @@ public:
 		use_transparent = false;
 		use_shadow_tricks = false;
 		use_principled = false;
+		use_denoising = false;
 	}
 
 	bool modified(const DeviceRequestedFeatures& requested_features)
@@ -163,7 +167,8 @@ public:
 		         use_patch_evaluation == requested_features.use_patch_evaluation &&
 		         use_transparent == requested_features.use_transparent &&
 		         use_shadow_tricks == requested_features.use_shadow_tricks &&
-		         use_principled == requested_features.use_principled);
+		         use_principled == requested_features.use_principled &&
+		         use_denoising == requested_features.use_denoising);
 	}
 
 	/* Convert the requested features structure to a build options,
@@ -213,6 +218,9 @@ public:
 		if(!use_principled) {
 			build_options += " -D__NO_PRINCIPLED__";
 		}
+		if(!use_denoising) {
+			build_options += " -D__NO_DENOISING__";
+		}
 		return build_options;
 	}
 };

intern/cycles/kernel/kernel_path_state.h

@@ -139,9 +139,11 @@ ccl_device_inline void path_state_next(KernelGlobals *kg, ccl_addr_space PathSta
 	/* random number generator next bounce */
 	state->rng_offset += PRNG_BOUNCE_NUM;
 
+#ifdef __DENOISING_FEATURES__
 	if((state->denoising_feature_weight == 0.0f) && !(state->flag & PATH_RAY_SHADOW_CATCHER)) {
 		state->flag &= ~PATH_RAY_STORE_SHADOW_INFO;
 	}
+#endif
 }
 
 ccl_device_inline uint path_state_ray_visibility(KernelGlobals *kg, PathState *state)

intern/cycles/kernel/kernel_types.h

@@ -236,6 +236,9 @@ CCL_NAMESPACE_BEGIN
 #ifdef __NO_PRINCIPLED__
 #  undef __PRINCIPLED__
 #endif
+#ifdef __NO_DENOISING__
+#  undef __DENOISING_FEATURES__
+#endif
 
 /* Random Numbers */
 

intern/cycles/render/session.cpp

@@ -722,6 +722,7 @@ DeviceRequestedFeatures Session::get_requested_device_features()
 	requested_features.use_baking = bake_manager->get_baking();
 	requested_features.use_integrator_branched = (scene->integrator->method == Integrator::BRANCHED_PATH);
 	requested_features.use_transparent &= scene->integrator->transparent_shadows;
+	requested_features.use_denoising = params.use_denoising;
 
 	return requested_features;
 }