Eevee: LightCache: Initial Implementation

This separate probe rendering from viewport rendering, making possible to
run the baking in another thread (non blocking and faster).

The baked lighting is saved in the blend file. Nothing needs to be
recomputed on load.

There is a few missing bits / bugs:
- Cache cannot be saved to disk as a separate file, it is saved in the DNA
  for now making file larger and memory usage higher.
- Auto update only cubemaps does update the grids (bug).
- Probes cannot be updated individually (considered as dynamic).
- Light Cache cannot be (re)generated during render.

1 files changed, 15 insertions, 0 deletions

diff --git a/source/blender/blenkernel/intern/scene.c b/source/blender/blenkernel/intern/scene.c
index 1b309d76f61..2b2fc2fc767 100644
--- a/source/blender/blenkernel/intern/scene.c
+++ b/source/blender/blenkernel/intern/scene.c
@@ -102,6 +102,9 @@
 #include "DEG_depsgraph_query.h"
 
 #include "RE_engine.h"
+#include "RE_engine.h"
+
+#include "engines/eevee/eevee_lightcache.h"
 
 #include "PIL_time.h"
 
@@ -316,6 +319,9 @@ void BKE_scene_copy_data(Main *bmain, Scene *sce_dst, const Scene *sce_src, cons
 	else {
 		sce_dst->preview = NULL;
 	}
+
+	sce_dst->eevee.light_cache = NULL;
+	/* TODO Copy the cache. */
 }
 
 Scene *BKE_scene_copy(Main *bmain, Scene *sce, int type)
@@ -511,6 +517,11 @@ void BKE_scene_free_ex(Scene *sce, const bool do_id_user)
 		sce->master_collection = NULL;
 	}
 
+	if (sce->eevee.light_cache) {
+		EEVEE_lightcache_free(sce->eevee.light_cache);
+		sce->eevee.light_cache = NULL;
+	}
+
 	/* These are freed on doversion. */
 	BLI_assert(sce->layer_properties == NULL);
 }
@@ -814,6 +825,8 @@ void BKE_scene_init(Scene *sce)
 	sce->eevee.gi_diffuse_bounces = 3;
 	sce->eevee.gi_cubemap_resolution = 512;
 	sce->eevee.gi_visibility_resolution = 32;
+	sce->eevee.gi_cubemap_draw_size = 0.3f;
+	sce->eevee.gi_irradiance_draw_size = 0.1f;
 
 	sce->eevee.taa_samples = 16;
 	sce->eevee.taa_render_samples = 64;
@@ -856,6 +869,8 @@ void BKE_scene_init(Scene *sce)
 	sce->eevee.shadow_cube_size = 512;
 	sce->eevee.shadow_cascade_size = 1024;
 
+	sce->eevee.light_cache = NULL;
+
 	sce->eevee.flag =
 	        SCE_EEVEE_VOLUMETRIC_LIGHTS |
 	        SCE_EEVEE_VOLUMETRIC_COLORED |