RenderEngine api: support for viewport rendering, details here:

http://wiki.blender.org/index.php/Dev:2.6/Source/Render/RenderEngineAPI

* This adds a Rendered draw type in the 3D view, only available when
  the render engine implements the view_draw callback.
* 3D view now stores a pointer to a RenderEngine.

* view_draw() callback will do OpenGL drawing instead of the viewport.
* view_update() callback is called after depsgraph updates.

1 files changed, 31 insertions, 10 deletions

diff --git a/source/blender/windowmanager/intern/wm_draw.c b/source/blender/windowmanager/intern/wm_draw.c
index 8261198ef78..389049d9e59 100644
--- a/source/blender/windowmanager/intern/wm_draw.c
+++ b/source/blender/windowmanager/intern/wm_draw.c
@@ -55,6 +55,8 @@
 #include "GPU_draw.h"
 #include "GPU_extensions.h"
 
+#include "RE_engine.h"
+
 #include "WM_api.h"
 #include "WM_types.h"
 #include "wm.h"
@@ -113,6 +115,19 @@ static int wm_area_test_invalid_backbuf(ScrArea *sa)
 		return 1;
 }
 
+static void wm_region_test_render_do_draw(ScrArea *sa, ARegion *ar)
+{
+	if(sa->spacetype == SPACE_VIEW3D) {
+		RegionView3D *rv3d = ar->regiondata;
+		RenderEngine *engine = (rv3d)? rv3d->render_engine: NULL;
+
+		if(engine && (engine->flag & RE_ENGINE_DO_DRAW)) {
+			ar->do_draw = 1;
+			engine->flag &= ~RE_ENGINE_DO_DRAW;
+		}
+	}
+}
+
 /********************** draw all **************************/
 /* - reference method, draw all each time                 */
 
@@ -205,7 +220,7 @@ static void wm_method_draw_overlap_all(bContext *C, wmWindow *win, int exchange)
 	for(sa= screen->areabase.first; sa; sa= sa->next)
 		for(ar= sa->regionbase.first; ar; ar= ar->next)
 			if(ar->swinid && !wm_area_test_invalid_backbuf(sa))
-					ED_region_tag_redraw(ar);
+				ED_region_tag_redraw(ar);
 
 	/* flush overlapping regions */
 	if(screen->regionbase.first) {
@@ -662,13 +677,28 @@ static int wm_draw_update_test_window(wmWindow *win)
 {
 	ScrArea *sa;
 	ARegion *ar;
+	int do_draw= 0;
 
 	for(ar= win->screen->regionbase.first; ar; ar= ar->next) {
 		if(ar->do_draw_overlay) {
 			wm_tag_redraw_overlay(win, ar);
 			ar->do_draw_overlay= 0;
 		}
+		if(ar->swinid && ar->do_draw)
+			do_draw= 1;
+	}
+
+	for(sa= win->screen->areabase.first; sa; sa= sa->next) {
+		for(ar=sa->regionbase.first; ar; ar= ar->next) {
+			wm_region_test_render_do_draw(sa, ar);
+
+			if(ar->swinid && ar->do_draw)
+				do_draw = 1;
+		}
 	}
+
+	if(do_draw)
+		return 1;
 	
 	if(win->screen->do_refresh)
 		return 1;
@@ -681,15 +711,6 @@ static int wm_draw_update_test_window(wmWindow *win)
 	if(win->screen->do_draw_drag)
 		return 1;
 	
-	for(ar= win->screen->regionbase.first; ar; ar= ar->next)
-		if(ar->swinid && ar->do_draw)
-			return 1;
-		
-	for(sa= win->screen->areabase.first; sa; sa= sa->next)
-		for(ar=sa->regionbase.first; ar; ar= ar->next)
-			if(ar->swinid && ar->do_draw)
-				return 1;
-
 	return 0;
 }