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, 18 insertions, 9 deletions

diff --git a/source/blender/draw/engines/eevee/eevee_data.c b/source/blender/draw/engines/eevee/eevee_data.c
index bf039871d52..96e784b524c 100644
--- a/source/blender/draw/engines/eevee/eevee_data.c
+++ b/source/blender/draw/engines/eevee/eevee_data.c
@@ -28,6 +28,7 @@
 #include "DRW_render.h"
 
 #include "eevee_private.h"
+#include "eevee_lightcache.h"
 
 static void eevee_view_layer_data_free(void *storage)
 {
@@ -53,6 +54,11 @@ static void eevee_view_layer_data_free(void *storage)
 	MEM_SAFE_FREE(sldata->shcasters_buffers[1].shadow_casters);
 	MEM_SAFE_FREE(sldata->shcasters_buffers[1].flags);
 
+	if (sldata->fallback_lightcache) {
+		EEVEE_lightcache_free(sldata->fallback_lightcache);
+		sldata->fallback_lightcache = NULL;
+	}
+
 	/* Probes */
 	MEM_SAFE_FREE(sldata->probes);
 	DRW_UBO_FREE_SAFE(sldata->probe_ubo);
@@ -60,15 +66,6 @@ static void eevee_view_layer_data_free(void *storage)
 	DRW_UBO_FREE_SAFE(sldata->planar_ubo);
 	DRW_UBO_FREE_SAFE(sldata->common_ubo);
 	DRW_UBO_FREE_SAFE(sldata->clip_ubo);
-	GPU_FRAMEBUFFER_FREE_SAFE(sldata->probe_filter_fb);
-	for (int i = 0; i < 6; ++i) {
-		GPU_FRAMEBUFFER_FREE_SAFE(sldata->probe_face_fb[i]);
-	}
-	DRW_TEXTURE_FREE_SAFE(sldata->probe_rt);
-	DRW_TEXTURE_FREE_SAFE(sldata->probe_depth_rt);
-	DRW_TEXTURE_FREE_SAFE(sldata->probe_pool);
-	DRW_TEXTURE_FREE_SAFE(sldata->irradiance_pool);
-	DRW_TEXTURE_FREE_SAFE(sldata->irradiance_rt);
 }
 
 EEVEE_ViewLayerData *EEVEE_view_layer_data_get(void)
@@ -77,6 +74,18 @@ EEVEE_ViewLayerData *EEVEE_view_layer_data_get(void)
 	        &draw_engine_eevee_type);
 }
 
+EEVEE_ViewLayerData *EEVEE_view_layer_data_ensure_ex(struct ViewLayer *view_layer)
+{
+	EEVEE_ViewLayerData **sldata = (EEVEE_ViewLayerData **)DRW_view_layer_engine_data_ensure_ex(
+	        view_layer, &draw_engine_eevee_type, &eevee_view_layer_data_free);
+
+	if (*sldata == NULL) {
+		*sldata = MEM_callocN(sizeof(**sldata), "EEVEE_ViewLayerData");
+	}
+
+	return *sldata;
+}
+
 EEVEE_ViewLayerData *EEVEE_view_layer_data_ensure(void)
 {
 	EEVEE_ViewLayerData **sldata = (EEVEE_ViewLayerData **)DRW_view_layer_engine_data_ensure(