Eevee: Shadow: Add high bitdepth option.

This option is here for reducing the memory usage of shadow maps.

Also lower bitdepth are quicker to process.

6 files changed, 22 insertions, 8 deletions

diff --git a/release/scripts/startup/bl_ui/properties_render.py b/release/scripts/startup/bl_ui/properties_render.py
index 49c3c9ad7c9..41e0e925569 100644
--- a/release/scripts/startup/bl_ui/properties_render.py
+++ b/release/scripts/startup/bl_ui/properties_render.py
@@ -763,6 +763,7 @@ class RENDER_PT_eevee_shadows(RenderButtonsPanel, Panel):
         col = layout.column()
         col.prop(props, "shadow_method")
         col.prop(props, "shadow_size")
+        col.prop(props, "shadow_high_bitdepth")
 
 
 classes = (
diff --git a/release/scripts/startup/bl_ui/properties_render_layer.py b/release/scripts/startup/bl_ui/properties_render_layer.py
index 250a4ea61a3..79658051603 100644
--- a/release/scripts/startup/bl_ui/properties_render_layer.py
+++ b/release/scripts/startup/bl_ui/properties_render_layer.py
@@ -309,6 +309,7 @@ class RENDERLAYER_PT_eevee_shadows(RenderLayerButtonsPanel, Panel):
         col = layout.column()
         col.template_override_property(layer_props, scene_props, "shadow_method")
         col.template_override_property(layer_props, scene_props, "shadow_size")
+        col.template_override_property(layer_props, scene_props, "shadow_high_bitdepth")
 
 
 classes = (
diff --git a/source/blender/draw/engines/eevee/eevee_engine.c b/source/blender/draw/engines/eevee/eevee_engine.c
index 735c3a77c5d..8d3d749d55a 100644
--- a/source/blender/draw/engines/eevee/eevee_engine.c
+++ b/source/blender/draw/engines/eevee/eevee_engine.c
@@ -312,6 +312,7 @@ static void EEVEE_scene_layer_settings_create(RenderEngine *UNUSED(engine), IDPr
 
 	BKE_collection_engine_property_add_int(props, "shadow_method", SHADOW_ESM);
 	BKE_collection_engine_property_add_int(props, "shadow_size", 512);
+	BKE_collection_engine_property_add_bool(props, "shadow_high_bitdepth", false);
 }
 
 static const DrawEngineDataSize EEVEE_data_size = DRW_VIEWPORT_DATA_SIZE(EEVEE_Data);
diff --git a/source/blender/draw/engines/eevee/eevee_lights.c b/source/blender/draw/engines/eevee/eevee_lights.c
index b70cfcb01dc..0033670528a 100644
--- a/source/blender/draw/engines/eevee/eevee_lights.c
+++ b/source/blender/draw/engines/eevee/eevee_lights.c
@@ -97,13 +97,19 @@ void EEVEE_lights_init(EEVEE_SceneLayerData *sldata)
 
 	int sh_method = BKE_collection_engine_property_value_get_int(props, "shadow_method");
 	int sh_size = BKE_collection_engine_property_value_get_int(props, "shadow_size");
+	int sh_high_bitdepth = BKE_collection_engine_property_value_get_int(props, "shadow_high_bitdepth");
 
 	EEVEE_LampsInfo *linfo = sldata->lamps;
-	if ((linfo->shadow_size != sh_size) || (linfo->shadow_method != sh_method)) {
+	if ((linfo->shadow_size != sh_size) ||
+		(linfo->shadow_method != sh_method) ||
+		(linfo->shadow_high_bitdepth != sh_high_bitdepth))
+	{
 		BLI_assert((sh_size > 0) && (sh_size <= 8192));
 		DRW_TEXTURE_FREE_SAFE(sldata->shadow_pool);
+		DRW_TEXTURE_FREE_SAFE(sldata->shadow_cube_target);
 		DRW_TEXTURE_FREE_SAFE(sldata->shadow_cascade_target);
 
+		linfo->shadow_high_bitdepth = sh_high_bitdepth;
 		linfo->shadow_method = sh_method;
 		linfo->shadow_size = sh_size;
 		linfo->shadow_render_data.stored_texel_size = 1.0 / (float)linfo->shadow_size;
@@ -115,11 +121,8 @@ void EEVEE_lights_init(EEVEE_SceneLayerData *sldata)
 
 		CLAMP(new_cube_target_size, 1, 4096);
 
-		if (linfo->shadow_cube_target_size != new_cube_target_size) {
-			linfo->shadow_cube_target_size = new_cube_target_size;
-			DRW_TEXTURE_FREE_SAFE(sldata->shadow_cube_target);
-			linfo->shadow_render_data.cube_texel_size = 1.0 / (float)linfo->shadow_cube_target_size;
-		}
+		linfo->shadow_cube_target_size = new_cube_target_size;
+		linfo->shadow_render_data.cube_texel_size = 1.0 / (float)linfo->shadow_cube_target_size;
 	}
 }
 
@@ -279,8 +282,8 @@ void EEVEE_lights_cache_finish(EEVEE_SceneLayerData *sldata)
 	}
 
 	switch (linfo->shadow_method) {
-		case SHADOW_ESM: shadow_pool_format = DRW_TEX_R_32; break;
-		case SHADOW_VSM: shadow_pool_format = DRW_TEX_RG_32; break;
+		case SHADOW_ESM: shadow_pool_format = ((linfo->shadow_high_bitdepth) ? DRW_TEX_R_32 : DRW_TEX_R_16); break;
+		case SHADOW_VSM: shadow_pool_format = ((linfo->shadow_high_bitdepth) ? DRW_TEX_RG_32 : DRW_TEX_RG_16); break;
 		default:
 			BLI_assert(!"Incorrect Shadow Method");
 			break;
diff --git a/source/blender/draw/engines/eevee/eevee_private.h b/source/blender/draw/engines/eevee/eevee_private.h
index 724764b5291..1e994c8d1fa 100644
--- a/source/blender/draw/engines/eevee/eevee_private.h
+++ b/source/blender/draw/engines/eevee/eevee_private.h
@@ -249,6 +249,7 @@ typedef struct EEVEE_LampsInfo {
 	int num_shadow, cache_num_shadow;
 	int update_flag;
 	int shadow_size, shadow_method;
+	bool shadow_high_bitdepth;
 	int shadow_cube_target_size;
 	/* List of lights in the scene. */
 	/* XXX This is fragile, can get out of sync quickly. */
diff --git a/source/blender/makesrna/intern/rna_scene.c b/source/blender/makesrna/intern/rna_scene.c
index f763f2bf454..119432f7ed3 100644
--- a/source/blender/makesrna/intern/rna_scene.c
+++ b/source/blender/makesrna/intern/rna_scene.c
@@ -2660,6 +2660,7 @@ RNA_LAYER_ENGINE_EEVEE_GET_SET_FLOAT(ssr_border_fade)
 RNA_LAYER_ENGINE_EEVEE_GET_SET_FLOAT(ssr_firefly_fac)
 RNA_LAYER_ENGINE_EEVEE_GET_SET_INT(shadow_method)
 RNA_LAYER_ENGINE_EEVEE_GET_SET_INT(shadow_size)
+RNA_LAYER_ENGINE_EEVEE_GET_SET_BOOL(shadow_high_bitdepth)
 
 /* object engine */
 RNA_LAYER_MODE_OBJECT_GET_SET_BOOL(show_wire)
@@ -6568,6 +6569,12 @@ static void rna_def_scene_layer_engine_settings_eevee(BlenderRNA *brna)
 	RNA_def_property_flag(prop, PROP_CONTEXT_UPDATE);
 	RNA_def_property_update(prop, NC_SCENE | ND_LAYER_CONTENT, "rna_SceneLayerEngineSettings_update");
 
+	prop = RNA_def_property(srna, "shadow_high_bitdepth", PROP_BOOLEAN, PROP_NONE);
+	RNA_def_property_boolean_funcs(prop, "rna_LayerEngineSettings_Eevee_shadow_high_bitdepth_get", "rna_LayerEngineSettings_Eevee_shadow_high_bitdepth_set");
+	RNA_def_property_ui_text(prop, "High Bitdepth", "Use 32bit shadows");
+	RNA_def_property_flag(prop, PROP_CONTEXT_UPDATE);
+	RNA_def_property_update(prop, NC_SCENE | ND_LAYER_CONTENT, "rna_SceneLayerEngineSettings_update");
+
 	RNA_define_verify_sdna(1); /* not in sdna */
 }