Improvements of Freestyle GUI controls - Part 1.

This commit makes a set of fixes and improvements based on the results of
Freestyle branch review by Brecht.  The discussion thread is:
http://lists.blender.org/pipermail/bf-committers/2012-October/037927.html

* The Layers panel and Freestyle-related panels in the Render tab of the
Properties window were moved to the newly created Render Layers tab.
The idea is to separate per render layer rendering options into a distinct
Properties window tab, and use the existing Render tab to accommodate
per scene rendering options.

* The new Freestyle panel was added in the Render tab.  The panel header
contains a toggle button for globally enabling Freestyle, with the aim of making
Freestyle easier to find.  Those Freestyle options in the Post Processing panel
were also moved to the new panel. 

* GUI code was updated so that UI controls will be greyed out (instead of
being hidden) when Freestyle is disabled.  Additional UI changes were also
made to reduce space consumption.

* The list of line sets was moved from the Freestyle panel to the Freestyle:
Line Sets panel.

* Old ray-casting algorithms were removed from the UI.  Now only two
algorithms (culled and non-culled cumulative visibility detection algorithms)
are available, and the selection is done by the new "Culling" toggle button
within the edge detection options.

3 files changed, 6 insertions, 1 deletions

diff --git a/source/blender/editors/space_buttons/buttons_context.c b/source/blender/editors/space_buttons/buttons_context.c
index 7e232a02536..e5f5a4beac6 100644
--- a/source/blender/editors/space_buttons/buttons_context.c
+++ b/source/blender/editors/space_buttons/buttons_context.c
@@ -538,6 +538,7 @@ static int buttons_context_path(const bContext *C, ButsContextPath *path, int ma
 	switch (mainb) {
 		case BCONTEXT_SCENE:
 		case BCONTEXT_RENDER:
+		case BCONTEXT_RENDER_LAYER:
 			found = buttons_context_path_scene(path);
 			break;
 		case BCONTEXT_WORLD:
@@ -1032,7 +1033,7 @@ void buttons_context_draw(const bContext *C, uiLayout *layout)
 			name = RNA_struct_name_get_alloc(ptr, namebuf, sizeof(namebuf), NULL);
 
 			if (name) {
-				if (!ELEM(sbuts->mainb, BCONTEXT_RENDER, BCONTEXT_SCENE) && ptr->type == &RNA_Scene)
+				if (!ELEM3(sbuts->mainb, BCONTEXT_RENDER, BCONTEXT_SCENE, BCONTEXT_RENDER_LAYER) && ptr->type == &RNA_Scene)
 					uiItemLDrag(row, ptr, "", icon);  /* save some space */
 				else
 					uiItemLDrag(row, ptr, name, icon);
diff --git a/source/blender/editors/space_buttons/buttons_header.c b/source/blender/editors/space_buttons/buttons_header.c
index ebba7d92819..3c2d9ac2eee 100644
--- a/source/blender/editors/space_buttons/buttons_header.c
+++ b/source/blender/editors/space_buttons/buttons_header.c
@@ -128,6 +128,7 @@ void buttons_header_buttons(const bContext *C, ARegion *ar)
 	} (void)0
 
 	BUTTON_HEADER_CTX(BCONTEXT_RENDER, ICON_SCENE, N_("Render"));
+	BUTTON_HEADER_CTX(BCONTEXT_RENDER_LAYER, ICON_RENDERLAYERS, N_("Render Layers"));
 	BUTTON_HEADER_CTX(BCONTEXT_SCENE, ICON_SCENE_DATA, N_("Scene"));
 	BUTTON_HEADER_CTX(BCONTEXT_WORLD, ICON_WORLD, N_("World"));
 	BUTTON_HEADER_CTX(BCONTEXT_OBJECT, ICON_OBJECT_DATA, N_("Object"));
diff --git a/source/blender/editors/space_buttons/space_buttons.c b/source/blender/editors/space_buttons/space_buttons.c
index c894c1a980b..a24a292be06 100644
--- a/source/blender/editors/space_buttons/space_buttons.c
+++ b/source/blender/editors/space_buttons/space_buttons.c
@@ -155,6 +155,8 @@ static void buttons_main_area_draw(const bContext *C, ARegion *ar)
 		ED_region_panels(C, ar, vertical, "scene", sbuts->mainb);
 	else if (sbuts->mainb == BCONTEXT_RENDER)
 		ED_region_panels(C, ar, vertical, "render", sbuts->mainb);
+	else if (sbuts->mainb == BCONTEXT_RENDER_LAYER)
+		ED_region_panels(C, ar, vertical, "render_layer", sbuts->mainb);
 	else if (sbuts->mainb == BCONTEXT_WORLD)
 		ED_region_panels(C, ar, vertical, "world", sbuts->mainb);
 	else if (sbuts->mainb == BCONTEXT_OBJECT)
@@ -239,6 +241,7 @@ static void buttons_area_listener(ScrArea *sa, wmNotifier *wmn)
 			switch (wmn->data) {
 				case ND_RENDER_OPTIONS:
 					buttons_area_redraw(sa, BCONTEXT_RENDER);
+					buttons_area_redraw(sa, BCONTEXT_RENDER_LAYER);
 					break;
 				case ND_FRAME:
 					/* any buttons area can have animated properties so redraw all */