Refactor depsgraph/render logic to serve evaluated depsgraph to engines

User notes
----------
Compositing, rendering of multi-layers in Eevee should be fully working now.

Development notes
-----------------
Up until now we were still using the same depsgraph for rendering and viewport
evaluation. And we had to go out of our ways to be sure the depsgraphs were
updated.

Now we iterate over the (to be rendered) view layers and create a depsgraph to
each one, fully evaluated and call the render engines (Cycles, Eevee, ...) with
this viewlayer/depsgraph/evaluation context.

At this time we are not handling data persistency, Depsgraph is created from
scratch prior to rendering each frame.  So I got rid of most of the partial
update calls we had during the render pipeline.

Cycles: Brecht Van Lommel did a patch to tackle some of the required Cycles
changes but this commit mark these changes as TODOs. Basically Cycles needs to
render one layer at a time.

Reviewers: sergey, brecht

Differential Revision: https://developer.blender.org/D3073

1 files changed, 6 insertions, 5 deletions

diff --git a/source/blender/render/extern/include/RE_pipeline.h b/source/blender/render/extern/include/RE_pipeline.h
index 0557efccc2f..822993a2372 100644
--- a/source/blender/render/extern/include/RE_pipeline.h
+++ b/source/blender/render/extern/include/RE_pipeline.h
@@ -34,6 +34,7 @@
 
 #include "DNA_listBase.h"
 #include "DNA_vec_types.h"
+#include "DEG_depsgraph.h"
 
 struct bMovieHandle;
 struct bNodeTree;
@@ -121,7 +122,9 @@ typedef struct RenderLayer {
 
 	/* optional saved endresult on disk */
 	void *exrhandle;
-	
+
+	struct EvaluationContext eval_ctx;
+
 	ListBase passes;
 	
 } RenderLayer;
@@ -250,7 +253,6 @@ void RE_ChangeModeFlag(struct Render *re, int flag, bool clear);
 struct Object *RE_GetCamera(struct Render *re); /* return camera override if set */
 void RE_SetOverrideCamera(struct Render *re, struct Object *camera);
 void RE_SetCamera(struct Render *re, struct Object *camera);
-void RE_SetDepsgraph(struct Render *re, struct Depsgraph *graph);
 void RE_SetEnvmapCamera(struct Render *re, struct Object *cam_ob, float viewscale, float clipsta, float clipend);
 void RE_SetWindow(struct Render *re, const rctf *viewplane, float clipsta, float clipend);
 void RE_SetOrtho(struct Render *re, const rctf *viewplane, float clipsta, float clipend);
@@ -267,7 +269,7 @@ void RE_GetViewPlane(struct Render *re, rctf *r_viewplane, rcti *r_disprect);
 void RE_Database_FromScene(
         struct Render *re, struct Main *bmain, struct Scene *scene,
         unsigned int lay, int use_camera_view);
-void RE_Database_Preprocess(struct Render *re);
+void RE_Database_Preprocess(struct EvaluationContext *eavl_ctx, struct Render *re);
 void RE_Database_Free(struct Render *re);
 
 /* project dbase again, when viewplane/perspective changed */
@@ -368,14 +370,13 @@ struct RenderPass *RE_pass_find_by_type(volatile struct RenderLayer *rl, int pas
 #define RE_BAKE_VERTEX_COLORS		14
 
 void RE_Database_Baking(
-        struct Render *re, struct Main *bmain, struct Scene *scene,
+        struct Render *re, struct Main *bmain, struct Scene *scene, struct ViewLayer *view_layer,
         unsigned int lay, const int type, struct Object *actob);
 
 void RE_DataBase_GetView(struct Render *re, float mat[4][4]);
 void RE_GetCameraWindow(struct Render *re, struct Object *camera, int frame, float mat[4][4]);
 void RE_GetCameraModelMatrix(struct Render *re, struct Object *camera, float r_mat[4][4]);
 struct Scene *RE_GetScene(struct Render *re);
-struct EvaluationContext *RE_GetEvalCtx(struct Render *re);
 
 bool RE_force_single_renderlayer(struct Scene *scene);
 bool RE_is_rendering_allowed(struct Scene *scene, struct Object *camera_override, struct ReportList *reports);