From 212a8d9e5ae78a30ed4c35161d91eeca35eaa41f Mon Sep 17 00:00:00 2001
From: Lukas Stockner <lukas.stockner@freenet.de>
Date: Sun, 5 Nov 2017 21:59:17 +0100
Subject: Cycles: Make per-object random value output also work for Lamps

---
 intern/cycles/kernel/geom/geom_object.h | 11 +++++++++++
 intern/cycles/kernel/kernel_shader.h    |  6 ++++++
 intern/cycles/kernel/kernel_types.h     |  2 ++
 intern/cycles/kernel/svm/svm_geometry.h | 10 +++++++++-
 4 files changed, 28 insertions(+), 1 deletion(-)

(limited to 'intern/cycles/kernel')

diff --git a/intern/cycles/kernel/geom/geom_object.h b/intern/cycles/kernel/geom/geom_object.h
index 1ffc143be34..a276096a745 100644
--- a/intern/cycles/kernel/geom/geom_object.h
+++ b/intern/cycles/kernel/geom/geom_object.h
@@ -244,6 +244,17 @@ ccl_device_inline float object_pass_id(KernelGlobals *kg, int object)
 	return f.y;
 }
 
+/* Per lamp random number for shader variation */
+
+ccl_device_inline float lamp_random_number(KernelGlobals *kg, int lamp)
+{
+	if(lamp == LAMP_NONE)
+		return 0.0f;
+
+	float4 f = kernel_tex_fetch(__light_data, lamp*LIGHT_SIZE + 4);
+	return f.y;
+}
+
 /* Per object random number for shader variation */
 
 ccl_device_inline float object_random_number(KernelGlobals *kg, int object)
diff --git a/intern/cycles/kernel/kernel_shader.h b/intern/cycles/kernel/kernel_shader.h
index 239c6b12bdf..26d3fcf15b2 100644
--- a/intern/cycles/kernel/kernel_shader.h
+++ b/intern/cycles/kernel/kernel_shader.h
@@ -57,6 +57,7 @@ ccl_device_noinline void shader_setup_from_ray(KernelGlobals *kg,
 #ifdef __INSTANCING__
 	sd->object = (isect->object == PRIM_NONE)? kernel_tex_fetch(__prim_object, isect->prim): isect->object;
 #endif
+	sd->lamp = LAMP_NONE;
 
 	sd->type = isect->type;
 	sd->flag = 0;
@@ -265,6 +266,7 @@ ccl_device_inline void shader_setup_from_sample(KernelGlobals *kg,
 #ifdef __INSTANCING__
 	sd->object = object;
 #endif
+	sd->lamp = LAMP_NONE;
 	/* currently no access to bvh prim index for strand sd->prim*/
 	sd->prim = prim;
 #ifdef __UV__
@@ -286,6 +288,7 @@ ccl_device_inline void shader_setup_from_sample(KernelGlobals *kg,
 	else if(lamp != LAMP_NONE) {
 		sd->ob_tfm  = lamp_fetch_transform(kg, lamp, false);
 		sd->ob_itfm = lamp_fetch_transform(kg, lamp, true);
+		sd->lamp = lamp;
 #endif
 	}
 
@@ -391,6 +394,7 @@ ccl_device_inline void shader_setup_from_background(KernelGlobals *kg, ShaderDat
 #ifdef __INSTANCING__
 	sd->object = PRIM_NONE;
 #endif
+	sd->lamp = LAMP_NONE;
 	sd->prim = PRIM_NONE;
 #ifdef __UV__
 	sd->u = 0.0f;
@@ -431,6 +435,7 @@ ccl_device_inline void shader_setup_from_volume(KernelGlobals *kg, ShaderData *s
 #  ifdef __INSTANCING__
 	sd->object = PRIM_NONE; /* todo: fill this for texture coordinates */
 #  endif
+	sd->lamp = LAMP_NONE;
 	sd->prim = PRIM_NONE;
 	sd->type = PRIMITIVE_NONE;
 
@@ -1143,6 +1148,7 @@ ccl_device_inline void shader_eval_volume(KernelGlobals *kg,
 		/* setup shaderdata from stack. it's mostly setup already in
 		 * shader_setup_from_volume, this switching should be quick */
 		sd->object = stack[i].object;
+		sd->lamp = LAMP_NONE;
 		sd->shader = stack[i].shader;
 
 		sd->flag &= ~SD_SHADER_FLAGS;
diff --git a/intern/cycles/kernel/kernel_types.h b/intern/cycles/kernel/kernel_types.h
index 919dafbc780..5b8b760c48c 100644
--- a/intern/cycles/kernel/kernel_types.h
+++ b/intern/cycles/kernel/kernel_types.h
@@ -957,6 +957,8 @@ typedef ccl_addr_space struct ShaderData {
 	float v;
 	/* object id if there is one, ~0 otherwise */
 	int object;
+	/* lamp id if there is one, ~0 otherwise */
+	int lamp;
 
 	/* motion blur sample time */
 	float time;
diff --git a/intern/cycles/kernel/svm/svm_geometry.h b/intern/cycles/kernel/svm/svm_geometry.h
index cce4e89e715..9af4a0182d9 100644
--- a/intern/cycles/kernel/svm/svm_geometry.h
+++ b/intern/cycles/kernel/svm/svm_geometry.h
@@ -90,7 +90,15 @@ ccl_device void svm_node_object_info(KernelGlobals *kg, ShaderData *sd, float *s
 		}
 		case NODE_INFO_OB_INDEX: data = object_pass_id(kg, sd->object); break;
 		case NODE_INFO_MAT_INDEX: data = shader_pass_id(kg, sd); break;
-		case NODE_INFO_OB_RANDOM: data = object_random_number(kg, sd->object); break;
+		case NODE_INFO_OB_RANDOM: {
+			if(sd->lamp != LAMP_NONE) {
+				data = lamp_random_number(kg, sd->lamp);
+			}
+			else {
+				data = object_random_number(kg, sd->object);
+			}
+			break;
+		}
 		default: data = 0.0f; break;
 	}
 
-- 
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