From 133f770ab3e7a6db49562cb73cb7aa5f75cf13f8 Mon Sep 17 00:00:00 2001
From: Brecht Van Lommel <brechtvanlommel@gmail.com>
Date: Sat, 28 Dec 2013 02:56:53 +0100
Subject: Code cleanup: move shadow_blocked function into separate file.

---
 intern/cycles/kernel/kernel_shadow.h | 97 ++++++++++++++++++++++++++++++++++++
 1 file changed, 97 insertions(+)
 create mode 100644 intern/cycles/kernel/kernel_shadow.h

(limited to 'intern/cycles/kernel/kernel_shadow.h')

diff --git a/intern/cycles/kernel/kernel_shadow.h b/intern/cycles/kernel/kernel_shadow.h
new file mode 100644
index 00000000000..4c1548af6e1
--- /dev/null
+++ b/intern/cycles/kernel/kernel_shadow.h
@@ -0,0 +1,97 @@
+/*
+ * Copyright 2011-2013 Blender Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License
+ */
+
+CCL_NAMESPACE_BEGIN
+
+ccl_device_inline bool shadow_blocked(KernelGlobals *kg, PathState *state, Ray *ray, float3 *shadow)
+{
+	*shadow = make_float3(1.0f, 1.0f, 1.0f);
+
+	if(ray->t == 0.0f)
+		return false;
+	
+	Intersection isect;
+#ifdef __HAIR__
+	bool result = scene_intersect(kg, ray, PATH_RAY_SHADOW_OPAQUE, &isect, NULL, 0.0f, 0.0f);
+#else
+	bool result = scene_intersect(kg, ray, PATH_RAY_SHADOW_OPAQUE, &isect);
+#endif
+
+#ifdef __TRANSPARENT_SHADOWS__
+	if(result && kernel_data.integrator.transparent_shadows) {
+		/* transparent shadows work in such a way to try to minimize overhead
+		 * in cases where we don't need them. after a regular shadow ray is
+		 * cast we check if the hit primitive was potentially transparent, and
+		 * only in that case start marching. this gives on extra ray cast for
+		 * the cases were we do want transparency.
+		 *
+		 * also note that for this to work correct, multi close sampling must
+		 * be used, since we don't pass a random number to shader_eval_surface */
+		if(shader_transparent_shadow(kg, &isect)) {
+			float3 throughput = make_float3(1.0f, 1.0f, 1.0f);
+			float3 Pend = ray->P + ray->D*ray->t;
+			int bounce = state->transparent_bounce;
+
+			for(;;) {
+				if(bounce >= kernel_data.integrator.transparent_max_bounce) {
+					return true;
+				}
+				else if(bounce >= kernel_data.integrator.transparent_min_bounce) {
+					/* todo: get random number somewhere for probabilistic terminate */
+#if 0
+					float probability = average(throughput);
+					float terminate = 0.0f;
+
+					if(terminate >= probability)
+						return true;
+
+					throughput /= probability;
+#endif
+				}
+
+#ifdef __HAIR__
+				if(!scene_intersect(kg, ray, PATH_RAY_SHADOW_TRANSPARENT, &isect, NULL, 0.0f, 0.0f)) {
+#else
+				if(!scene_intersect(kg, ray, PATH_RAY_SHADOW_TRANSPARENT, &isect)) {
+#endif
+					*shadow *= throughput;
+					return false;
+				}
+
+				if(!shader_transparent_shadow(kg, &isect))
+					return true;
+
+				ShaderData sd;
+				shader_setup_from_ray(kg, &sd, &isect, ray, state->bounce+1);
+				shader_eval_surface(kg, &sd, 0.0f, PATH_RAY_SHADOW, SHADER_CONTEXT_SHADOW);
+
+				throughput *= shader_bsdf_transparency(kg, &sd);
+
+				ray->P = ray_offset(sd.P, -sd.Ng);
+				if(ray->t != FLT_MAX)
+					ray->D = normalize_len(Pend - ray->P, &ray->t);
+
+				bounce++;
+			}
+		}
+	}
+#endif
+
+	return result;
+}
+
+CCL_NAMESPACE_END
+
-- 
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