Depsgraph: New dependency graph integration commit

This commit integrates the work done so far on the new dependency graph system,
where goal was to replace legacy depsgraph with the new one, supporting loads of
neat features like:

- More granular dependency relation nature, which solves issues with fake cycles
  in the dependencies.

- Move towards all-animatable, by better integration of drivers into the system.

- Lay down some basis for upcoming copy-on-write, overrides and so on.

The new system is living side-by-side with the previous one and disabled by
default, so nothing will become suddenly broken. The way to enable new depsgraph
is to pass `--new-depsgraph` command line argument.

It's a bit early to consider the system production-ready, there are some TODOs
and issues were discovered during the merge period, they'll be addressed ASAP.
But it's important to merge, because it's the only way to attract artists to
really start testing this system.

There are number of assorted documents related on the design of the new system:

* http://wiki.blender.org/index.php/User:Aligorith/GSoC2013_Depsgraph#Design_Documents
* http://wiki.blender.org/index.php/User:Nazg-gul/DependencyGraph

There are also some user-related information online:

* http://code.blender.org/2015/02/blender-dependency-graph-branch-for-users/
* http://code.blender.org/2015/03/more-dependency-graph-tricks/

Kudos to everyone who was involved into the project:

- Joshua "Aligorith" Leung -- design specification, initial code
- Lukas "lukas_t" Toenne -- integrating code into blender, with further fixes
- Sergey "Sergey" "Sharybin" -- some mocking around, trying to wrap up the
  project and so
- Bassam "slikdigit" Kurdali -- stressing the new system, reporting all the
  issues and recording/writing documentation.
- Everyone else who i forgot to mention here :)

2 files changed, 15 insertions, 0 deletions

diff --git a/source/creator/CMakeLists.txt b/source/creator/CMakeLists.txt
index c0b0c2eadb6..ffaf6f42b18 100644
--- a/source/creator/CMakeLists.txt
+++ b/source/creator/CMakeLists.txt
@@ -31,6 +31,7 @@ blender_include_dirs(
 	../blender/blenlib
 	../blender/blenkernel
 	../blender/blenloader
+	../blender/depsgraph
 	../blender/editors/include
 	../blender/makesrna
 	../blender/imbuf
diff --git a/source/creator/creator.c b/source/creator/creator.c
index 721e43cda4d..e2d7bda3a21 100644
--- a/source/creator/creator.c
+++ b/source/creator/creator.c
@@ -93,6 +93,8 @@
 #include "BKE_image.h"
 #include "BKE_particle.h"
 
+#include "DEG_depsgraph.h"
+
 #include "IMB_imbuf.h"  /* for IMB_init */
 
 #ifdef WITH_PYTHON
@@ -357,6 +359,10 @@ static int print_help(int UNUSED(argc), const char **UNUSED(argv), void *data)
 	printf("Other Options:\n");
 	BLI_argsPrintOtherDoc(ba);
 
+	printf("\n");
+	printf("Experimental features:\n");
+	BLI_argsPrintArgDoc(ba, "--enable-new-depsgraph");
+
 	printf("Argument Parsing:\n");
 	printf("\targuments must be separated by white space. eg\n");
 	printf("\t\t\"blender -ba test.blend\"\n");
@@ -929,6 +935,12 @@ static int set_threads(int argc, const char **argv, void *UNUSED(data))
 	}
 }
 
+static int depsgraph_use_new(int UNUSED(argc), const char **UNUSED(argv), void *UNUSED(data))
+{
+	DEG_depsgraph_switch_to_new();
+	return 0;
+}
+
 static int set_verbosity(int argc, const char **argv, void *UNUSED(data))
 {
 	if (argc > 1) {
@@ -1494,6 +1506,8 @@ static void setupArguments(bContext *C, bArgs *ba, SYS_SystemHandle *syshandle)
 	BLI_argsAdd(ba, 1, NULL, "--debug-depsgraph", "\n\tEnable debug messages from dependency graph", debug_mode_generic, (void *)G_DEBUG_DEPSGRAPH);
 	BLI_argsAdd(ba, 1, NULL, "--debug-gpumem", "\n\tEnable GPU memory stats in status bar", debug_mode_generic, (void *)G_DEBUG_GPU_MEM);
 
+	BLI_argsAdd(ba, 1, NULL, "--enable-new-depsgraph", "\n\tUse new dependency graph", depsgraph_use_new, NULL);
+
 	BLI_argsAdd(ba, 1, NULL, "--verbose", "<verbose>\n\tSet logging verbosity level.", set_verbosity, NULL);
 
 	BLI_argsAdd(ba, 1, NULL, "--factory-startup", "\n\tSkip reading the "STRINGIFY (BLENDER_STARTUP_FILE)" in the users home directory", set_factory_startup, NULL);