[Bf-blender-cvs] [fa19940dc6] master: Cycles: Fix rng_state initialization when using resumable rendering

[Lukas Stockner]

Commit: fa19940dc63d22cc03e1411e2add8ec8647b5f28
Author: Lukas Stockner
Date:   Wed Feb 1 05:43:17 2017 +0100
Branches: master
https://developer.blender.org/rBfa19940dc63d22cc03e1411e2add8ec8647b5f28

Cycles: Fix rng_state initialization when using resumable rendering

===================================================================

M	intern/cycles/blender/blender_session.cpp
M	intern/cycles/kernel/kernel_path_common.h
M	intern/cycles/kernel/kernel_types.h
M	intern/cycles/render/integrator.cpp
M	intern/cycles/render/integrator.h

===================================================================

diff --git a/intern/cycles/blender/blender_session.cpp b/intern/cycles/blender/blender_session.cpp
index 04b5c3fa01..2f30cbd961 100644
--- a/intern/cycles/blender/blender_session.cpp
+++ b/intern/cycles/blender/blender_session.cpp
@@ -1352,6 +1352,9 @@ void BlenderSession::update_resumable_tile_manager(int num_samples)
 	VLOG(1) << "Samples range start is " << range_start_sample << ", "
 	        << "number of samples to render is " << range_num_samples;
 
+	scene->integrator->start_sample = range_start_sample;
+	scene->integrator->tag_update(scene);
+
 	session->tile_manager.range_start_sample = range_start_sample;
 	session->tile_manager.range_num_samples = range_num_samples;
 }
diff --git a/intern/cycles/kernel/kernel_path_common.h b/intern/cycles/kernel/kernel_path_common.h
index 13597eab28..7b903556bf 100644
--- a/intern/cycles/kernel/kernel_path_common.h
+++ b/intern/cycles/kernel/kernel_path_common.h
@@ -30,7 +30,7 @@ ccl_device_inline void kernel_path_trace_setup(KernelGlobals *kg,
 
 	int num_samples = kernel_data.integrator.aa_samples;
 
-	if(sample == 0) {
+	if(sample == kernel_data.integrator.start_sample) {
 		*rng_state = hash_int_2d(x, y);
 	}
 
diff --git a/intern/cycles/kernel/kernel_types.h b/intern/cycles/kernel/kernel_types.h
index 4d9c4b2e6f..8c271c75e4 100644
--- a/intern/cycles/kernel/kernel_types.h
+++ b/intern/cycles/kernel/kernel_types.h
@@ -1187,6 +1187,9 @@ typedef struct KernelIntegrator {
 	int volume_samples;
 
 	float light_inv_rr_threshold;
+
+	int start_sample;
+	int pad1, pad2, pad3;
 } KernelIntegrator;
 static_assert_align(KernelIntegrator, 16);
 
diff --git a/intern/cycles/render/integrator.cpp b/intern/cycles/render/integrator.cpp
index 41e1dae274..1ab0f9874f 100644
--- a/intern/cycles/render/integrator.cpp
+++ b/intern/cycles/render/integrator.cpp
@@ -64,6 +64,7 @@ NODE_DEFINE(Integrator)
 	SOCKET_INT(mesh_light_samples, "Mesh Light Samples", 1);
 	SOCKET_INT(subsurface_samples, "Subsurface Samples", 1);
 	SOCKET_INT(volume_samples, "Volume Samples", 1);
+	SOCKET_INT(start_sample, "Start Sample", 0);
 
 	SOCKET_BOOLEAN(sample_all_lights_direct, "Sample All Lights Direct", true);
 	SOCKET_BOOLEAN(sample_all_lights_indirect, "Sample All Lights Indirect", true);
@@ -161,6 +162,7 @@ void Integrator::device_update(Device *device, DeviceScene *dscene, Scene *scene
 	kintegrator->mesh_light_samples = mesh_light_samples;
 	kintegrator->subsurface_samples = subsurface_samples;
 	kintegrator->volume_samples = volume_samples;
+	kintegrator->start_sample = start_sample;
 
 	if(method == BRANCHED_PATH) {
 		kintegrator->sample_all_lights_direct = sample_all_lights_direct;
diff --git a/intern/cycles/render/integrator.h b/intern/cycles/render/integrator.h
index f8cc0507ad..27fff4831e 100644
--- a/intern/cycles/render/integrator.h
+++ b/intern/cycles/render/integrator.h
@@ -66,6 +66,7 @@ public:
 	int mesh_light_samples;
 	int subsurface_samples;
 	int volume_samples;
+	int start_sample;
 
 	bool sample_all_lights_direct;
 	bool sample_all_lights_indirect;