Cycles Hair: Two basic bair shaders added

A new hair bsdf node, with two closure options, is added. These closures allow the generation of the reflective and transmission components of hair. The node allows control of the highlight colour, roughness and angular shift.

Llimitations include:
-No glint or fresnel adjustments.
-The 'offset' is un-used when triangle primitives are used.

1 files changed, 40 insertions, 0 deletions

diff --git a/intern/cycles/kernel/svm/svm_closure.h b/intern/cycles/kernel/svm/svm_closure.h
index 9a9aefa5b29..6d9c4e215e6 100644
--- a/intern/cycles/kernel/svm/svm_closure.h
+++ b/intern/cycles/kernel/svm/svm_closure.h
@@ -337,6 +337,46 @@ __device void svm_node_closure_bsdf(KernelGlobals *kg, ShaderData *sd, float *st
 			}
 			break;
 		}
+#ifdef __HAIR__
+		case CLOSURE_BSDF_HAIR_REFLECTION_ID:
+		case CLOSURE_BSDF_HAIR_TRANSMISSION_ID: {
+			
+			if(sd->flag & SD_BACKFACING && sd->segment != ~0) {
+				ShaderClosure *sc = svm_node_closure_get_bsdf(sd, mix_weight);
+				if(sc) {
+					sc->weight = make_float3(1.0f,1.0f,1.0f);
+					sc->N = N;
+					sd->flag |= bsdf_transparent_setup(sc);
+				}
+			}
+			else {
+				ShaderClosure *sc = &sd->closure[sd->num_closure];
+				sc = svm_node_closure_get_bsdf(sd, mix_weight);
+
+				if(sc) {
+					sc->N = N;
+					sc->data0 = param1;
+					sc->data1 = param2;
+					sc->offset = -stack_load_float(stack, data_node.z);
+					if(sd->segment == ~0) {
+						sc->T = normalize(sd->dPdv);
+						sc->offset = 0.0f;
+					}
+					else
+						sc->T = sd->dPdu;
+					if(type == CLOSURE_BSDF_HAIR_REFLECTION_ID) {
+						sd->flag |= bsdf_hair_reflection_setup(sc);
+					}
+					else {
+						sd->flag |= bsdf_hair_transmission_setup(sc);
+					}
+				}
+			}
+
+			break;
+		}
+#endif
+
 #ifdef __SUBSURFACE__
 		case CLOSURE_BSSRDF_COMPATIBLE_ID:
 		case CLOSURE_BSSRDF_CUBIC_ID: