1 files changed, 33 insertions, 0 deletions
diff --git a/intern/cycles/kernel/light/sample.h b/intern/cycles/kernel/light/sample.h
index 6b643a95250..ff5d43ed8cd 100644
--- a/intern/cycles/kernel/light/sample.h
+++ b/intern/cycles/kernel/light/sample.h
@@ -22,6 +22,7 @@
 #include "kernel/light/light.h"
 
 #include "kernel/sample/mapping.h"
+#include "kernel/sample/mis.h"
 
 CCL_NAMESPACE_BEGIN
 
@@ -268,4 +269,36 @@ ccl_device_inline void light_sample_to_volume_shadow_ray(
   shadow_ray_setup(sd, ls, P, ray);
 }
 
+ccl_device_inline float light_sample_mis_weight_forward(KernelGlobals kg,
+                                                        const float forward_pdf,
+                                                        const float nee_pdf)
+{
+#ifdef WITH_CYCLES_DEBUG
+  if (kernel_data.integrator.direct_light_sampling_type == DIRECT_LIGHT_SAMPLING_FORWARD) {
+    return 1.0f;
+  }
+  else if (kernel_data.integrator.direct_light_sampling_type == DIRECT_LIGHT_SAMPLING_NEE) {
+    return 0.0f;
+  }
+  else
+#endif
+    return power_heuristic(forward_pdf, nee_pdf);
+}
+
+ccl_device_inline float light_sample_mis_weight_nee(KernelGlobals kg,
+                                                    const float nee_pdf,
+                                                    const float forward_pdf)
+{
+#ifdef WITH_CYCLES_DEBUG
+  if (kernel_data.integrator.direct_light_sampling_type == DIRECT_LIGHT_SAMPLING_FORWARD) {
+    return 0.0f;
+  }
+  else if (kernel_data.integrator.direct_light_sampling_type == DIRECT_LIGHT_SAMPLING_NEE) {
+    return 1.0f;
+  }
+  else
+#endif
+    return power_heuristic(nee_pdf, forward_pdf);
+}
+
 CCL_NAMESPACE_END