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.

3 files changed, 105 insertions, 4 deletions

diff --git a/source/blender/makesrna/intern/rna_render.c b/source/blender/makesrna/intern/rna_render.c
index 8f928313840..2ed06516c55 100644
--- a/source/blender/makesrna/intern/rna_render.c
+++ b/source/blender/makesrna/intern/rna_render.c
@@ -95,6 +95,40 @@ static void engine_render(RenderEngine *engine, struct Scene *scene)
 	RNA_parameter_list_free(&list);
 }
 
+static void engine_view_update(RenderEngine *engine, const struct bContext *context)
+{
+	extern FunctionRNA rna_RenderEngine_view_update_func;
+	PointerRNA ptr;
+	ParameterList list;
+	FunctionRNA *func;
+
+	RNA_pointer_create(NULL, engine->type->ext.srna, engine, &ptr);
+	func= &rna_RenderEngine_view_update_func;
+
+	RNA_parameter_list_create(&list, &ptr, func);
+	RNA_parameter_set_lookup(&list, "context", &context);
+	engine->type->ext.call(NULL, &ptr, func, &list);
+
+	RNA_parameter_list_free(&list);
+}
+
+static void engine_view_draw(RenderEngine *engine, const struct bContext *context)
+{
+	extern FunctionRNA rna_RenderEngine_view_draw_func;
+	PointerRNA ptr;
+	ParameterList list;
+	FunctionRNA *func;
+
+	RNA_pointer_create(NULL, engine->type->ext.srna, engine, &ptr);
+	func= &rna_RenderEngine_view_draw_func;
+
+	RNA_parameter_list_create(&list, &ptr, func);
+	RNA_parameter_set_lookup(&list, "context", &context);
+	engine->type->ext.call(NULL, &ptr, func, &list);
+
+	RNA_parameter_list_free(&list);
+}
+
 /* RenderEngine registration */
 
 static void rna_RenderEngine_unregister(Main *UNUSED(bmain), StructRNA *type)
@@ -114,7 +148,7 @@ static StructRNA *rna_RenderEngine_register(Main *bmain, ReportList *reports, vo
 	RenderEngineType *et, dummyet = {NULL};
 	RenderEngine dummyengine= {NULL};
 	PointerRNA dummyptr;
-	int have_function[2];
+	int have_function[4];
 
 	/* setup dummy engine & engine type to store static properties in */
 	dummyengine.type= &dummyet;
@@ -151,6 +185,8 @@ static StructRNA *rna_RenderEngine_register(Main *bmain, ReportList *reports, vo
 
 	et->update= (have_function[0])? engine_update: NULL;
 	et->render= (have_function[1])? engine_render: NULL;
+	et->view_update= (have_function[2])? engine_view_update: NULL;
+	et->view_draw= (have_function[3])? engine_view_draw: NULL;
 
 	BLI_addtail(&R_engines, et);
 
@@ -251,6 +287,17 @@ static void rna_def_render_engine(BlenderRNA *brna)
 	RNA_def_function_flag(func, FUNC_REGISTER_OPTIONAL);
 	RNA_def_pointer(func, "scene", "Scene", "", "");
 
+	/* viewport render callbacks */
+	func= RNA_def_function(srna, "view_update", NULL);
+	RNA_def_function_ui_description(func, "Update on data changes for viewport render");
+	RNA_def_function_flag(func, FUNC_REGISTER_OPTIONAL);
+	RNA_def_pointer(func, "context", "Context", "", "");
+
+	func= RNA_def_function(srna, "view_draw", NULL);
+	RNA_def_function_ui_description(func, "Draw viewport render");
+	RNA_def_function_flag(func, FUNC_REGISTER_OPTIONAL);
+	RNA_def_pointer(func, "context", "Context", "", "");
+
 	/* tag for redraw */
 	RNA_def_function(srna, "tag_redraw", "engine_tag_redraw");
 	RNA_def_function_ui_description(func, "Request redraw for viewport rendering");
diff --git a/source/blender/makesrna/intern/rna_scene.c b/source/blender/makesrna/intern/rna_scene.c
index 7bdaa0a512f..ce62550feeb 100644
--- a/source/blender/makesrna/intern/rna_scene.c
+++ b/source/blender/makesrna/intern/rna_scene.c
@@ -40,6 +40,7 @@
 #include "BLI_math.h"
 
 /* Include for Bake Options */
+#include "RE_engine.h"
 #include "RE_pipeline.h"
 
 #ifdef WITH_QUICKTIME
@@ -55,6 +56,8 @@
 #include <libavformat/avformat.h>
 #endif
 
+#include "ED_render.h"
+
 #include "WM_api.h"
 #include "WM_types.h"
 
@@ -773,6 +776,11 @@ static int rna_RenderSettings_engine_get(PointerRNA *ptr)
 	return 0;
 }
 
+static void rna_RenderSettings_engine_update(Main *bmain, Scene *UNUSED(unused), PointerRNA *UNUSED(ptr))
+{
+	ED_render_engine_changed(bmain);
+}
+
 static void rna_Scene_glsl_update(Main *UNUSED(bmain), Scene *UNUSED(scene), PointerRNA *ptr)
 {
 	Scene *scene= (Scene*)ptr->id.data;
@@ -3212,7 +3220,7 @@ static void rna_def_scene_render_data(BlenderRNA *brna)
 	RNA_def_property_enum_funcs(prop, "rna_RenderSettings_engine_get", "rna_RenderSettings_engine_set",
 	                            "rna_RenderSettings_engine_itemf");
 	RNA_def_property_ui_text(prop, "Engine", "Engine to use for rendering");
-	RNA_def_property_update(prop, NC_WINDOW, NULL);
+	RNA_def_property_update(prop, NC_WINDOW, "rna_RenderSettings_engine_update");
 
 	prop= RNA_def_property(srna, "has_multiple_engines", PROP_BOOLEAN, PROP_NONE);
 	RNA_def_property_boolean_funcs(prop, "rna_RenderSettings_multiple_engines_get", NULL);
diff --git a/source/blender/makesrna/intern/rna_space.c b/source/blender/makesrna/intern/rna_space.c
index 51faccc0d6c..5c494a3337f 100644
--- a/source/blender/makesrna/intern/rna_space.c
+++ b/source/blender/makesrna/intern/rna_space.c
@@ -47,6 +47,9 @@
 #include "WM_api.h"
 #include "WM_types.h"
 
+#include "RE_engine.h"
+#include "RE_pipeline.h"
+
 #include "RNA_enum_types.h"
 
 EnumPropertyItem space_type_items[] = {
@@ -98,8 +101,8 @@ EnumPropertyItem viewport_shade_items[] = {
 	{OB_BOUNDBOX, "BOUNDBOX", ICON_BBOX, "Bounding Box", "Display the object's local bounding boxes only"},
 	{OB_WIRE, "WIREFRAME", ICON_WIRE, "Wireframe", "Display the object as wire edges"},
 	{OB_SOLID, "SOLID", ICON_SOLID, "Solid", "Display the object solid, lit with default OpenGL lights"},
-	//{OB_SHADED, "SHADED", ICON_SMOOTH, "Shaded", "Display the object solid, with preview shading interpolated at vertices"},
 	{OB_TEXTURE, "TEXTURED", ICON_POTATO, "Textured", "Display the object solid, with face-assigned textures"},
+	{OB_RENDER, "RENDERED", ICON_SMOOTH, "Rendered", "Display render preview"},
 	{0, NULL, 0, NULL, NULL}};
 
 #ifdef RNA_RUNTIME
@@ -313,6 +316,25 @@ static void rna_SpaceView3D_layer_update(Main *bmain, Scene *UNUSED(scene), Poin
 	DAG_on_visible_update(bmain, FALSE);
 }
 
+static void rna_SpaceView3D_viewport_shade_update(Main *bmain, Scene *scene, PointerRNA *ptr)
+{
+	View3D *v3d= (View3D*)(ptr->data);
+	ScrArea *sa= rna_area_from_space(ptr);
+
+	if(v3d->drawtype != OB_RENDER) {
+		ARegion *ar;
+
+		for(ar=sa->regionbase.first; ar; ar=ar->next) {
+			RegionView3D *rv3d = ar->regiondata;
+
+			if(rv3d && rv3d->render_engine) {
+				RE_engine_free(rv3d->render_engine);
+				rv3d->render_engine= NULL;
+			}
+		}
+	}
+}
+
 static void rna_SpaceView3D_pivot_update(Main *bmain, Scene *UNUSED(scene), PointerRNA *ptr)
 {
 	if (U.uiflag & USER_LOCKAROUND) {
@@ -423,6 +445,29 @@ static void rna_RegionView3D_view_matrix_set(PointerRNA *ptr, const float *value
 	ED_view3d_from_m4((float (*)[4])values, rv3d->ofs, rv3d->viewquat, &rv3d->dist);
 }
 
+static EnumPropertyItem *rna_SpaceView3D_viewport_shade_itemf(bContext *UNUSED(C), PointerRNA *ptr, PropertyRNA *UNUSED(prop), int *free)
+{
+	Scene *scene = ((bScreen*)ptr->id.data)->scene;
+	RenderEngineType *type = RE_engines_find(scene->r.engine);
+	
+	EnumPropertyItem *item= NULL;
+	int totitem= 0;
+
+	RNA_enum_items_add_value(&item, &totitem, viewport_shade_items, OB_BOUNDBOX);
+	RNA_enum_items_add_value(&item, &totitem, viewport_shade_items, OB_WIRE);
+	RNA_enum_items_add_value(&item, &totitem, viewport_shade_items, OB_SOLID);
+	RNA_enum_items_add_value(&item, &totitem, viewport_shade_items, OB_TEXTURE);
+	
+	if(type->view_draw) {
+		RNA_enum_items_add_value(&item, &totitem, viewport_shade_items, OB_RENDER);
+	}
+
+	RNA_enum_item_end(&item, &totitem);
+	*free= 1;
+
+	return item;
+}
+
 /* Space Image Editor */
 
 static PointerRNA rna_SpaceImageEditor_uvedit_get(PointerRNA *ptr)
@@ -1227,8 +1272,9 @@ static void rna_def_space_view3d(BlenderRNA *brna)
 	prop= RNA_def_property(srna, "viewport_shade", PROP_ENUM, PROP_NONE);
 	RNA_def_property_enum_sdna(prop, NULL, "drawtype");
 	RNA_def_property_enum_items(prop, viewport_shade_items);
+	RNA_def_property_enum_funcs(prop, NULL, NULL, "rna_SpaceView3D_viewport_shade_itemf");
 	RNA_def_property_ui_text(prop, "Viewport Shading", "Method to display/shade objects in the 3D View");
-	RNA_def_property_update(prop, NC_SPACE|ND_SPACE_VIEW3D, NULL);
+	RNA_def_property_update(prop, NC_SPACE|ND_SPACE_VIEW3D, "rna_SpaceView3D_viewport_shade_update");
 
 	prop= RNA_def_property(srna, "local_view", PROP_POINTER, PROP_NONE);
 	RNA_def_property_pointer_sdna(prop, NULL, "localvd");