Cycles: seed value to get different noise values from renders, there was a patch

for this but I've implemented it differently.

intern/cycles/render/integrator.cpp

@@ -21,6 +21,8 @@
 #include "scene.h"
 #include "sobol.h"
 
+#include "util_hash.h"
+
 CCL_NAMESPACE_BEGIN
 
 Integrator::Integrator()
@@ -41,6 +43,8 @@ Integrator::Integrator()
 	no_caustics = false;
 	blur_caustics = 0.0f;
 
+	seed = 0;
+
 	need_update = true;
 }
 
@@ -79,6 +83,8 @@ void Integrator::device_update(Device *device, DeviceScene *dscene)
 	kintegrator->no_caustics = no_caustics;
 	kintegrator->blur_caustics = blur_caustics;
 
+	kintegrator->seed = hash_int(seed);
+
 	/* sobol directions table */
 	int dimensions = PRNG_BASE_NUM + (max_bounce + transparent_max_bounce + 2)*PRNG_BOUNCE_NUM;
 	uint *directions = dscene->sobol_directions.resize(SOBOL_BITS*dimensions);
@@ -109,7 +115,8 @@ bool Integrator::modified(const Integrator& integrator)
 		transparent_probalistic == integrator.transparent_probalistic &&
 		transparent_shadows == integrator.transparent_shadows &&
 		no_caustics == integrator.no_caustics &&
-		blur_caustics == integrator.blur_caustics);
+		blur_caustics == integrator.blur_caustics &&
+		seed == integrator.seed);
 }
 
 void Integrator::tag_update(Scene *scene)

intern/cycles/render/integrator.h

@@ -42,6 +42,9 @@ public:
 
 	bool no_caustics;
 	float blur_caustics;
+
+	int seed;
+
 	bool need_update;
 
 	Integrator();