Cycles: preview rendering support for world/material/lamp.

Patch by Sergey, .blend by Thomas and some further tweaks by me.

Still to solve later: allow external engines to specify own preview .blend, for
now the code here is doing too much magic hacking on the preview scene still.

intern/cycles/blender/addon/__init__.py

@@ -39,6 +39,7 @@ class CyclesRender(bpy.types.RenderEngine):
     bl_idname = 'CYCLES'
     bl_label = "Cycles Render"
     bl_use_shading_nodes = True
+    bl_use_preview = True
 
     def __init__(self):
         self.session = None
@@ -48,6 +49,13 @@ class CyclesRender(bpy.types.RenderEngine):
 
     # final render
     def update(self, data, scene):
+        if self.is_preview:
+            if not self.session:
+                use_osl = bpy.context.scene.cycles.shading_system
+
+                engine.create(self, data, scene,
+                              None, None, None, use_osl)
+        else:
             if not self.session:
                 engine.create(self, data, scene)
             else:
@@ -58,13 +66,6 @@ class CyclesRender(bpy.types.RenderEngine):
     def render(self, scene):
         engine.render(self)
 
-    # preview render
-    # def preview_update(self, context, id):
-    #    pass
-    #
-    # def preview_render(self):
-    #    pass
-
     # viewport render
     def view_update(self, context):
         if not self.session:

intern/cycles/blender/addon/engine.py

@@ -30,7 +30,7 @@ def init():
     _cycles.init(path, user_path)
 
 
-def create(engine, data, scene, region=0, v3d=0, rv3d=0):
+def create(engine, data, scene, region=0, v3d=0, rv3d=0, preview_osl=False):
     import bpy
     import _cycles
 
@@ -44,7 +44,7 @@ def create(engine, data, scene, region=0, v3d=0, rv3d=0):
     if rv3d:
         rv3d = rv3d.as_pointer()
 
-    engine.session = _cycles.create(engine.as_pointer(), userpref, data, scene, region, v3d, rv3d)
+    engine.session = _cycles.create(engine.as_pointer(), userpref, data, scene, region, v3d, rv3d, preview_osl)
 
 
 def free(engine):

intern/cycles/blender/addon/ui.py

@@ -1175,6 +1175,9 @@ def get_panels():
         types.PARTICLE_PT_force_fields,
         types.PARTICLE_PT_vertexgroups,
         types.PARTICLE_PT_custom_props,
+        types.MATERIAL_PT_preview,
+        types.DATA_PT_preview,
+        types.WORLD_PT_preview,
         )
 
 

intern/cycles/blender/blender_python.cpp

@@ -52,8 +52,9 @@ static PyObject *init_func(PyObject *self, PyObject *args)
 static PyObject *create_func(PyObject *self, PyObject *args)
 {
 	PyObject *pyengine, *pyuserpref, *pydata, *pyscene, *pyregion, *pyv3d, *pyrv3d;
+	int preview_osl;
 
-	if(!PyArg_ParseTuple(args, "OOOOOOO", &pyengine, &pyuserpref, &pydata, &pyscene, &pyregion, &pyv3d, &pyrv3d))
+	if(!PyArg_ParseTuple(args, "OOOOOOOp", &pyengine, &pyuserpref, &pydata, &pyscene, &pyregion, &pyv3d, &pyrv3d, &preview_osl))
 		return NULL;
 
 	/* RNA */
@@ -91,14 +92,22 @@ static PyObject *create_func(PyObject *self, PyObject *args)
 	Py_BEGIN_ALLOW_THREADS
 
 	if(rv3d) {
-		/* interactive session */
+		/* interactive viewport session */
 		int width = region.width();
 		int height = region.height();
 
 		session = new BlenderSession(engine, userpref, data, scene, v3d, rv3d, width, height);
 	}
 	else {
-		/* offline session */
+		/* override some settings for preview */
+		if(engine.is_preview()) {
+			PointerRNA cscene = RNA_pointer_get(&sceneptr, "cycles");
+
+			RNA_boolean_set(&cscene, "shading_system", preview_osl);
+			RNA_boolean_set(&cscene, "use_progressive_refine", true);
+		}
+
+		/* offline session or preview render */
 		session = new BlenderSession(engine, userpref, data, scene);
 	}
 

intern/cycles/blender/blender_session.cpp

@@ -288,7 +288,14 @@ void BlenderSession::write_render_tile(RenderTile& rtile)
 
 void BlenderSession::update_render_tile(RenderTile& rtile)
 {
+	/* use final write for preview renders, otherwise render result wouldn't be
+	 * be updated in blender side
+	 * would need to be investigated a bit further, but for now shall be fine
+	 */
+	if (!b_engine.is_preview())
 		do_write_update_render_tile(rtile, true);
+	else
+		do_write_update_render_tile(rtile, false);
 }
 
 void BlenderSession::render()

source/blender/editors/datafiles/CMakeLists.txt

@@ -43,6 +43,7 @@ if(WITH_BLENDER)
 
 		# blends
 		data_to_c_simple(../../../../release/datafiles/preview.blend SRC)
+		data_to_c_simple(../../../../release/datafiles/preview_cycles.blend SRC)
 
 		# images
 		data_to_c_simple(../../../../release/datafiles/splash.png SRC)

source/blender/editors/datafiles/SConscript

@@ -46,6 +46,7 @@ sources.extend((
 
 	os.path.join(env['DATA_SOURCES'], "startup.blend.c"),
 	os.path.join(env['DATA_SOURCES'], "preview.blend.c"),
+	os.path.join(env['DATA_SOURCES'], "preview_cycles.blend.c"),
 	
 	os.path.join(env['DATA_SOURCES'], "add.png.c"),
 	os.path.join(env['DATA_SOURCES'], "blob.png.c"),

source/blender/editors/include/ED_datafiles.h

@@ -36,6 +36,12 @@
 extern int datatoc_startup_blend_size;
 extern char datatoc_startup_blend[];
 
+extern int datatoc_preview_blend_size;
+extern char datatoc_preview_blend[];
+
+extern int datatoc_preview_cycles_blend_size;
+extern char datatoc_preview_cycles_blend[];
+
 extern int datatoc_blender_icons16_png_size;
 extern char datatoc_blender_icons16_png[];
 

source/blender/editors/render/render_preview.c

@@ -97,6 +97,7 @@
 #include "WM_api.h"
 #include "WM_types.h"
 
+#include "ED_datafiles.h"
 #include "ED_render.h"
 #include "ED_view3d.h"
 
@@ -169,6 +170,7 @@ typedef struct ShaderPreview {
 	unsigned int *pr_rect;
 	int pr_method;
 
+	Main *pr_main;
 } ShaderPreview;
 
 typedef struct IconPreviewSize {
@@ -187,23 +189,33 @@ typedef struct IconPreview {
 /* *************************** Preview for buttons *********************** */
 
 static Main *pr_main = NULL;
+static Main *pr_main_cycles = NULL;
 
-void ED_preview_init_dbase(void)
-{
 #ifndef WITH_HEADLESS
-	BlendFileData *bfd;
-	extern int datatoc_preview_blend_size;
-	extern char datatoc_preview_blend[];
+static Main *load_main_from_memory(char *blend, int blend_size)
+{
 	const int fileflags = G.fileflags;
+	Main *bmain = NULL;
+	BlendFileData *bfd;
 
 	G.fileflags |= G_FILE_NO_UI;
-	bfd = BLO_read_from_memory(datatoc_preview_blend, datatoc_preview_blend_size, NULL);
+	bfd = BLO_read_from_memory(blend, blend_size, NULL);
 	if (bfd) {
-		pr_main = bfd->main;
+		bmain = bfd->main;
 
 		MEM_freeN(bfd);
 	}
 	G.fileflags = fileflags;
+
+	return bmain;
+}
+#endif
+
+void ED_preview_init_dbase(void)
+{
+#ifndef WITH_HEADLESS
+	pr_main = load_main_from_memory(datatoc_preview_blend, datatoc_preview_blend_size);
+	pr_main_cycles = load_main_from_memory(datatoc_preview_cycles_blend, datatoc_preview_cycles_blend_size);
 #endif
 }
 
@@ -211,6 +223,9 @@ void ED_preview_free_dbase(void)
 {
 	if (pr_main)
 		free_main(pr_main);
+
+	if (pr_main_cycles)
+		free_main(pr_main_cycles);
 }
 
 static int preview_mat_has_sss(Material *mat, bNodeTree *ntree)
@@ -239,7 +254,7 @@ static int preview_mat_has_sss(Material *mat, bNodeTree *ntree)
 	return 0;
 }
 
-static Scene *preview_get_scene(void)
+static Scene *preview_get_scene(Main *pr_main)
 {
 	if (pr_main == NULL) return NULL;
 	
@@ -253,8 +268,9 @@ static Scene *preview_prepare_scene(Scene *scene, ID *id, int id_type, ShaderPre
 {
 	Scene *sce;
 	Base *base;
+	Main *pr_main = sp->pr_main;
 	
-	sce = preview_get_scene();
+	sce = preview_get_scene(pr_main);
 	if (sce) {
 		
 		/* this flag tells render to not execute depsgraph or ipos etc */
@@ -299,6 +315,7 @@ static Scene *preview_prepare_scene(Scene *scene, ID *id, int id_type, ShaderPre
 				sp->matcopy = mat;
 				BLI_addtail(&pr_main->mat, mat);
 				
+				if (!BKE_scene_use_new_shading_nodes(scene)) {
 					init_render_material(mat, 0, NULL);     /* call that retrieves mode_l */
 					end_render_material(mat);
 					
@@ -342,6 +359,7 @@ static Scene *preview_prepare_scene(Scene *scene, ID *id, int id_type, ShaderPre
 							}
 						}
 					}
+				}
 
 				
 				if (sp->pr_method == PR_ICON_RENDER) {
@@ -433,17 +451,19 @@ static Scene *preview_prepare_scene(Scene *scene, ID *id, int id_type, ShaderPre
 				BLI_addtail(&pr_main->lamp, la);
 			}
 
+			sce->lay = 1 << MA_LAMP;
+
+			if (!BKE_scene_use_new_shading_nodes(scene)) {
 				if (la && la->type == LA_SUN && (la->sun_effect_type & LA_SUN_EFFECT_SKY)) {
 					sce->lay = 1 << MA_ATMOS;
 					sce->world = scene->world;
 					sce->camera = (Object *)BLI_findstring(&pr_main->object, "CameraAtmo", offsetof(ID, name) + 2);
 				}
 				else {
-				sce->lay = 1 << MA_LAMP;
 					sce->world = NULL;
 					sce->camera = (Object *)BLI_findstring(&pr_main->object, "Camera", offsetof(ID, name) + 2);
 				}
-			sce->r.mode &= ~R_SHADOW;
+			}
 				
 			for (base = sce->base.first; base; base = base->next) {
 				if (base->object->id.name[2] == 'p') {
@@ -639,6 +659,7 @@ static void shader_preview_render(ShaderPreview *sp, ID *id, int split, int firs
 	short idtype = GS(id->name);
 	char name[32];
 	int sizex;
+	Main *pr_main = sp->pr_main;
 	
 	/* in case of split preview, use border render */
 	if (split) {
@@ -648,7 +669,7 @@ static void shader_preview_render(ShaderPreview *sp, ID *id, int split, int firs
 	else sizex = sp->sizex;
 	
 	/* we have to set preview variables first */
-	sce = preview_get_scene();
+	sce = preview_get_scene(pr_main);
 	if (sce) {
 		sce->r.xsch = sizex;
 		sce->r.ysch = sp->sizey;
@@ -749,6 +770,7 @@ static void shader_preview_startjob(void *customdata, short *stop, short *do_upd
 static void shader_preview_free(void *customdata)
 {
 	ShaderPreview *sp = customdata;
+	Main *pr_main = sp->pr_main;
 	
 	if (sp->matcopy) {
 		struct IDProperty *properties;
@@ -1076,13 +1098,14 @@ void ED_preview_shader_job(const bContext *C, void *owner, ID *id, ID *parent, M
 	Object *ob = CTX_data_active_object(C);
 	wmJob *wm_job;
 	ShaderPreview *sp;
+	Scene *scene = CTX_data_scene(C);
 
 	wm_job = WM_jobs_get(CTX_wm_manager(C), CTX_wm_window(C), owner, "Shader Preview",
 	                    WM_JOB_EXCL_RENDER, WM_JOB_TYPE_RENDER_PREVIEW);
 	sp = MEM_callocN(sizeof(ShaderPreview), "shader preview");
 
 	/* customdata for preview thread */
-	sp->scene = CTX_data_scene(C);
+	sp->scene = scene;
 	sp->owner = owner;
 	sp->sizex = sizex;
 	sp->sizey = sizey;
@@ -1090,6 +1113,14 @@ void ED_preview_shader_job(const bContext *C, void *owner, ID *id, ID *parent, M
 	sp->id = id;
 	sp->parent = parent;
 	sp->slot = slot;
+
+	/* hardcoded preview .blend for cycles/internal, this should be solved
+	 * once with custom preview .blend path for external engines */
+	if (BKE_scene_use_new_shading_nodes(scene))
+		sp->pr_main = pr_main_cycles;
+	else
+		sp->pr_main = pr_main;
+
 	if (ob && ob->totcol) copy_v4_v4(sp->col, ob->col);
 	else sp->col[0] = sp->col[1] = sp->col[2] = sp->col[3] = 1.0f;