CameraData Input Cycles Node

----------------------------
reviewed and approved by Brecht 

Important note:
the camera Z is reverted compared to Blender render.
Now it goes from zero (camera) to positive (in front of the camera)

intern/cycles/app/cycles_xml.cpp

@@ -454,6 +454,9 @@ static void xml_read_shader_graph(const XMLReadState& state, Shader *shader, pug
 			xml_read_ustring(&attr->attribute, node, "attribute");
 			snode = attr;
 		}
+		else if(string_ieuals(node.name(), "camera")) {
+			snode = new CameraNode();
+		}
 		else if(string_iequals(node.name(), "fresnel")) {
 			snode = new FresnelNode();
 		}

intern/cycles/blender/blender_shader.cpp

@@ -127,7 +127,6 @@ static ShaderNode *add_node(BL::BlendData b_data, ShaderGraph *graph, BL::Node *
 
 	switch(b_node.type()) {
 		/* not supported */
-		case BL::ShaderNode::type_CAMERA: break;
 		case BL::ShaderNode::type_CURVE_RGB: break;
 		case BL::ShaderNode::type_CURVE_VEC: break;
 		case BL::ShaderNode::type_GEOMETRY: break;
@@ -155,6 +154,10 @@ static ShaderNode *add_node(BL::BlendData b_data, ShaderGraph *graph, BL::Node *
 			node = value;
 			break;
 		}
+		case BL::ShaderNode::type_CAMERA: {
+			node = new CameraNode();
+			break;
+		}
 		case BL::ShaderNode::type_MIX_RGB: {
 			BL::ShaderNodeMixRGB b_mix_node(b_node);
 			MixNode *mix = new MixNode();

intern/cycles/kernel/CMakeLists.txt

@@ -54,6 +54,7 @@ set(SRC_SVM_HEADERS
 	svm/svm.h
 	svm/svm_attribute.h
 	svm/svm_bsdf.h
+	svm/svm_camera.h
 	svm/svm_closure.h
 	svm/svm_convert.h
 	svm/svm_displace.h

intern/cycles/kernel/osl/nodes/CMakeLists.txt

@@ -7,6 +7,7 @@ set(SRC_OSL
 	node_background.osl
 	node_blend_texture.osl
 	node_bump.osl
+	node_camera.osl
 	node_clouds_texture.osl
 	node_convert_from_color.osl
 	node_convert_from_float.osl

intern/cycles/kernel/osl/nodes/node_camera.osl

@@ -0,0 +1,33 @@
+/*
+ * Copyright 2011, Blender Foundation.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+#include "stdosl.h"
+
+shader node_camera(
+	output vector ViewVector = vector(0.0, 0.0, 0.0),
+	output float ViewZDepth = 0.0,
+	output float ViewDistance = 0.0)
+{
+	ViewVector = (vector)transform("world", "camera", P);
+
+	ViewZDepth = fabs(ViewVector[2]);
+	ViewDistance = lenght(ViewVector);
+
+	ViewVector = normalize(ViewVector);
+}
+

intern/cycles/kernel/svm/svm.h

@@ -126,6 +126,7 @@ CCL_NAMESPACE_END
 #include "svm_convert.h"
 #include "svm_displace.h"
 #include "svm_fresnel.h"
+#include "svm_camera.h"
 #include "svm_geometry.h"
 #include "svm_hsv.h"
 #include "svm_image.h"
@@ -232,6 +233,9 @@ __device_noinline void svm_eval_nodes(KernelGlobals *kg, ShaderData *sd, ShaderT
 				svm_node_tex_magic(kg, sd, stack, node, &offset);
 				break;
 #endif
+			case NODE_CAMERA:
+				svm_node_camera(kg, sd, stack, node.y, node.z, node.w);
+				break;
 			case NODE_GEOMETRY:
 				svm_node_geometry(sd, stack, node.y, node.z);
 				break;

intern/cycles/kernel/svm/svm_camera.h

@@ -0,0 +1,43 @@
+/*
+ * Copyright 2011, Blender Foundation.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ */
+
+CCL_NAMESPACE_BEGIN
+
+__device void svm_node_camera(KernelGlobals *kg, ShaderData *sd, float *stack, uint out_vector, uint out_zdepth, uint out_distance)
+{
+	float distance;
+	float zdepth;
+	float3 vector;
+
+	Transform tfm = kernel_data.cam.worldtocamera;
+	vector = transform(&tfm, sd->P);
+	zdepth = vector.z;
+	distance = len(vector);
+
+	if (stack_valid(out_vector))
+		stack_store_float3(stack, out_vector, normalize(vector));
+
+	if (stack_valid(out_zdepth))
+		stack_store_float(stack, out_zdepth, zdepth);
+
+	if (stack_valid(out_distance))
+		stack_store_float(stack, out_distance, distance);
+}
+
+CCL_NAMESPACE_END
+

intern/cycles/kernel/svm/svm_types.h

@@ -82,7 +82,8 @@ typedef enum NodeType {
 	NODE_CLOSURE_VOLUME = 4900,
 	NODE_SEPARATE_RGB = 5000,
 	NODE_COMBINE_RGB = 5100,
-	NODE_HSV = 5200
+	NODE_HSV = 5200,
+	NODE_CAMERA = 5300
 } NodeType;
 
 typedef enum NodeAttributeType {

intern/cycles/render/nodes.cpp

@@ -1804,6 +1804,33 @@ void AttributeNode::compile(OSLCompiler& compiler)
 	compiler.add(this, "node_attribute");
 }
 
+/* Camera */
+
+CameraNode::CameraNode()
+: ShaderNode("camera")
+{
+	add_output("View Vector",  SHADER_SOCKET_VECTOR);
+	add_output("View Z Depth",  SHADER_SOCKET_FLOAT);
+	add_output("View Distance",  SHADER_SOCKET_FLOAT);
+}
+
+void CameraNode::compile(SVMCompiler& compiler)
+{
+	ShaderOutput *vector_out = output("View Vector");
+	ShaderOutput *z_depth_out = output("View Z Depth");
+	ShaderOutput *distance_out = output("View Distance");
+
+	compiler.stack_assign(vector_out);
+	compiler.stack_assign(z_depth_out);
+	compiler.stack_assign(distance_out);
+	compiler.add_node(NODE_CAMERA, vector_out->stack_offset, z_depth_out->stack_offset, distance_out->stack_offset);
+}
+
+void CameraNode::compile(OSLCompiler& compiler)
+{
+	compiler.add(this, "node_camera");
+}
+
 /* Fresnel */
 
 FresnelNode::FresnelNode()

intern/cycles/render/nodes.h

@@ -315,6 +315,11 @@ public:
 	ustring attribute;
 };
 
+class CameraNode : public ShaderNode {
+public:
+	SHADER_NODE_CLASS(CameraNode)
+};
+
 class FresnelNode : public ShaderNode {
 public:
 	SHADER_NODE_CLASS(FresnelNode)

source/blender/nodes/shader/nodes/node_shader_camera.c

@@ -62,7 +62,7 @@ void register_node_type_sh_camera(bNodeTreeType *ttype)
 	static bNodeType ntype;
 
 	node_type_base(ttype, &ntype, SH_NODE_CAMERA, "Camera Data", NODE_CLASS_INPUT, 0);
-	node_type_compatibility(&ntype, NODE_OLD_SHADING);
+	node_type_compatibility(&ntype, NODE_OLD_SHADING|NODE_NEW_SHADING);
 	node_type_socket_templates(&ntype, NULL, sh_node_camera_out);
 	node_type_size(&ntype, 95, 95, 120);
 	node_type_storage(&ntype, "node_camera", NULL, NULL);