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.

3 files changed, 13 insertions, 8 deletions

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. */