[Bf-blender-cvs] [3ffb0f69832] blender-v2.79a-release: Cycles: Tweaks to avoid compilation error of megakernel

[Sergey Sharybin]

Commit: 3ffb0f69832dc2ce71ce2719ebb7cee52f307efb
Author: Sergey Sharybin
Date:   Tue Sep 12 13:33:46 2017 +0500
Branches: blender-v2.79a-release
https://developer.blender.org/rB3ffb0f69832dc2ce71ce2719ebb7cee52f307efb

Cycles: Tweaks to avoid compilation error of megakernel

Also moved code out of deep-inside ifdef block, otherwise it was quite confusing.

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

M	intern/cycles/kernel/closure/bssrdf.h
M	intern/cycles/kernel/kernel_shadow.h

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

diff --git a/intern/cycles/kernel/closure/bssrdf.h b/intern/cycles/kernel/closure/bssrdf.h
index f733ea4c517..06221189060 100644
--- a/intern/cycles/kernel/closure/bssrdf.h
+++ b/intern/cycles/kernel/closure/bssrdf.h
@@ -348,8 +348,9 @@ ccl_device_inline Bssrdf *bssrdf_alloc(ShaderData *sd, float3 weight)
 {
 	Bssrdf *bssrdf = (Bssrdf*)closure_alloc(sd, sizeof(Bssrdf), CLOSURE_NONE_ID, weight);
 
-	if(!bssrdf)
+	if(bssrdf == NULL) {
 		return NULL;
+	}
 
 	float sample_weight = fabsf(average(weight));
 	bssrdf->sample_weight = sample_weight;
diff --git a/intern/cycles/kernel/kernel_shadow.h b/intern/cycles/kernel/kernel_shadow.h
index fab5946970d..73f0cb82ea0 100644
--- a/intern/cycles/kernel/kernel_shadow.h
+++ b/intern/cycles/kernel/kernel_shadow.h
@@ -16,6 +16,39 @@
 
 CCL_NAMESPACE_BEGIN
 
+#ifdef __VOLUME__
+typedef struct VolumeState {
+#  ifdef __SPLIT_KERNEL__
+#  else
+	PathState ps;
+#  endif
+} VolumeState;
+
+/* Get PathState ready for use for volume stack evaluation. */
+ccl_device_inline PathState *shadow_blocked_volume_path_state(
+        KernelGlobals *kg,
+        VolumeState *volume_state,
+        ccl_addr_space PathState *state,
+        ShaderData *sd,
+        Ray *ray)
+{
+#  ifdef __SPLIT_KERNEL__
+	ccl_addr_space PathState *ps =
+	        &kernel_split_state.state_shadow[ccl_global_id(1) * ccl_global_size(0) + ccl_global_id(0)];
+#  else
+	PathState *ps = &volume_state->ps;
+#  endif
+	*ps = *state;
+	/* We are checking for shadow on the "other" side of the surface, so need
+	 * to discard volume we are currently at.
+	 */
+	if(dot(sd->Ng, ray->D) < 0.0f) {
+		kernel_volume_stack_enter_exit(kg, sd, ps->volume_stack);
+	}
+	return ps;
+}
+#endif  /* __VOLUME__ */
+
 /* Attenuate throughput accordingly to the given intersection event.
  * Returns true if the throughput is zero and traversal can be aborted.
  */