Depsgraph: Comb code to a better state all over

Some summary of changes:

- Don't use DEG prefix for types and enumerator values:
  the code is already inside DEG namespace.

- Put code where it locally belongs to: avoid having one
  single header file with all sort of definitions in it.

- Take advantage of modern C++11 enabled by default.

1 files changed, 201 insertions, 0 deletions

diff --git a/source/blender/depsgraph/intern/node/deg_node.h b/source/blender/depsgraph/intern/node/deg_node.h
new file mode 100644
index 00000000000..a07990df862
--- /dev/null
+++ b/source/blender/depsgraph/intern/node/deg_node.h
@@ -0,0 +1,201 @@
+/*
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * 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.
+ *
+ * The Original Code is Copyright (C) 2013 Blender Foundation.
+ * All rights reserved.
+ *
+ * Original Author: Joshua Leung
+ * Contributor(s): None Yet
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+/** \file depsgraph/intern/node/deg_node.h
+ *  \ingroup depsgraph
+ */
+
+#pragma once
+
+#include "intern/depsgraph_type.h"
+
+#include "BLI_utildefines.h"
+
+struct GHash;
+struct ID;
+struct Scene;
+
+namespace DEG {
+
+struct Relation;
+struct Depsgraph;
+struct OperationNode;
+
+/* Metatype of Nodes - The general "level" in the graph structure
+ * the node serves. */
+enum class NodeClass {
+	/* Types generally unassociated with user-visible entities,
+	 * but needed for graph functioning. */
+	GENERIC         = 0,
+	/* [Outer Node] An "aspect" of evaluating/updating an ID-Block, requiring
+	 * certain types of evaluation behavior. */
+	COMPONENT       = 1,
+	/* [Inner Node] A glorified function-pointer/callback for scheduling up
+	 * evaluation operations for components, subject to relationship
+	 * requirements. */
+	OPERATION       = 2,
+};
+const char *nodeClassAsString(NodeClass node_class);
+
+/* Types of Nodes */
+enum class NodeType {
+	/* Fallback type for invalid return value */
+	UNDEFINED        = 0,
+	/* Inner Node (Operation) */
+	OPERATION,
+
+	/* **** Generic Types **** */
+
+	/* Time-Source */
+	TIMESOURCE,
+	/* ID-Block reference - used as landmarks/collection point for components,
+	 * but not usually part of main graph. */
+	ID_REF,
+
+	/* **** Outer Types **** */
+
+	/* Parameters Component - Default when nothing else fits
+	 * (i.e. just SDNA property setting). */
+	PARAMETERS,
+	/* Generic "Proxy-Inherit" Component. */
+	PROXY,
+	/* Animation Component */
+	ANIMATION,
+	/* Transform Component (Parenting/Constraints) */
+	TRANSFORM,
+	/* Geometry Component (Mesh/Displist) */
+	GEOMETRY,
+	/* Sequencer Component (Scene Only) */
+	SEQUENCER,
+	/* Component which contains all operations needed for layer collections
+	 * evaluation. */
+	LAYER_COLLECTIONS,
+	/* Entry component of majority of ID nodes: prepares CoW pointers for
+	 * execution. */
+	COPY_ON_WRITE,
+	/* Used by all operations which are updating object when something is
+	 * changed in view layer. */
+	OBJECT_FROM_LAYER,
+	/* Un-interestying datablock, which is a part of dependency graph, but does
+	 * not have very distinctive update procedure.  */
+	GENERIC_DATABLOCK,
+
+	/* **** Evaluation-Related Outer Types (with Subdata) **** */
+
+	/* Pose Component - Owner/Container of Bones Eval */
+	EVAL_POSE,
+	/* Bone Component - Child/Subcomponent of Pose */
+	BONE,
+	/* Particle Systems Component */
+	PARTICLE_SYSTEM,
+	PARTICLE_SETTINGS,
+	/* Material Shading Component */
+	SHADING,
+	SHADING_PARAMETERS,
+	/* Point cache Component */
+	POINT_CACHE,
+	/* Cache Component */
+	/* TODO(sergey); Verify that we really need this. */
+	CACHE,
+	/* Batch Cache Component.
+	 * TODO (dfelinto/sergey): rename to make it more generic. */
+	BATCH_CACHE,
+	/* Duplication system. Used to force duplicated objects visible when
+	 * when duplicator is visible. */
+	DUPLI,
+	/* Synchronization back to original datablock. */
+	SYNCHRONIZE,
+
+	/* Total number of meaningful node types. */
+	NUM_TYPES,
+};
+const char *nodeTypeAsString(NodeType type);
+
+/* All nodes in Depsgraph are descended from this. */
+struct Node {
+	/* Helper class for static typeinfo in subclasses. */
+	struct TypeInfo {
+		TypeInfo(NodeType type,
+		        const char *type_name,
+		        int id_recalc_tag = 0);
+		NodeType type;
+		const char *type_name;
+		int id_recalc_tag;
+	};
+	struct Stats {
+		Stats();
+		/* Reset all the counters. Including all stats needed for average
+		 * evaluation time calculation. */
+		void reset();
+		/* Reset counters needed for the current graph evaluation, does not
+		 * touch averaging accumulators. */
+		void reset_current();
+		/* Time spend on this node during current graph evaluation. */
+		double current_time;
+	};
+	/* Relationships between nodes
+	 * The reason why all depsgraph nodes are descended from this type (apart
+	 * from basic serialization benefits - from the typeinfo) is that we can
+	 * have relationships between these nodes. */
+	typedef vector<Relation *> Relations;
+
+	const char *name;     /* Identifier - mainly for debugging purposes. */
+	NodeType type;  /* Structural type of node. */
+	Relations inlinks;    /* Nodes which this one depends on. */
+	Relations outlinks;   /* Nodes which depend on this one. */
+	Stats stats;  /* Evaluation statistics. */
+
+	/* Generic tags for traversal algorithms and such.
+	 *
+	 * Actual meaning of values depends on a specific area. Every area is to
+	 * clean this before use. */
+	int custom_flags;
+
+	/* Methods. */
+	Node();
+	virtual ~Node();
+
+	virtual string identifier() const;
+
+	virtual void init(const ID * /*id*/, const char * /*subdata*/) {}
+
+	virtual void tag_update(Depsgraph * /*graph*/, eUpdateSource /*source*/) {}
+
+	virtual OperationNode *get_entry_operation() { return NULL; }
+	virtual OperationNode *get_exit_operation() { return NULL; }
+
+	virtual NodeClass get_class() const;
+};
+
+/* Macros for common static typeinfo. */
+#define DEG_DEPSNODE_DECLARE \
+	static const Node::TypeInfo typeinfo
+#define DEG_DEPSNODE_DEFINE(NodeType, type_, tname_) \
+	const Node::TypeInfo NodeType::typeinfo = Node::TypeInfo(type_, tname_)
+
+void deg_register_base_depsnodes();
+
+}  // namespace DEG