Implement automatic LOD (Level of Detail)

-Happens on import by default for all models
-Just works (tm)
-Biasing can be later adjusted per node or per viewport (as well as globally)
-Disabled AABB.get_support test because its broken

3 files changed, 25 insertions, 0 deletions

diff --git a/scene/main/scene_tree.cpp b/scene/main/scene_tree.cpp
index 9e396d4030..1df61daa2c 100644
--- a/scene/main/scene_tree.cpp
+++ b/scene/main/scene_tree.cpp
@@ -1391,6 +1391,10 @@ SceneTree::SceneTree() {
 	const bool use_debanding = GLOBAL_DEF("rendering/quality/screen_filters/use_debanding", false);
 	root->set_use_debanding(use_debanding);
 
+	float lod_threshold = GLOBAL_DEF("rendering/quality/mesh_lod/threshold_pixels", 1.0);
+	ProjectSettings::get_singleton()->set_custom_property_info("rendering/quality/mesh_lod/threshold_pixels", PropertyInfo(Variant::FLOAT, "rendering/quality/mesh_lod/threshold_pixels", PROPERTY_HINT_RANGE, "0,1024,0.1"));
+	root->set_lod_threshold(lod_threshold);
+
 	bool snap_2d_transforms = GLOBAL_DEF("rendering/quality/2d/snap_2d_transforms_to_pixel", false);
 	root->set_snap_2d_transforms_to_pixel(snap_2d_transforms);
 
diff --git a/scene/main/viewport.cpp b/scene/main/viewport.cpp
index 9f50b34e21..c96dd4ad35 100644
--- a/scene/main/viewport.cpp
+++ b/scene/main/viewport.cpp
@@ -3192,6 +3192,14 @@ bool Viewport::is_using_debanding() const {
 	return use_debanding;
 }
 
+void Viewport::set_lod_threshold(float p_pixels) {
+	lod_threshold = p_pixels;
+	RS::get_singleton()->viewport_set_lod_threshold(viewport, lod_threshold);
+}
+float Viewport::get_lod_threshold() const {
+	return lod_threshold;
+}
+
 void Viewport::set_debug_draw(DebugDraw p_debug_draw) {
 	debug_draw = p_debug_draw;
 	RS::get_singleton()->viewport_set_debug_draw(viewport, RS::ViewportDebugDraw(p_debug_draw));
@@ -3505,6 +3513,9 @@ void Viewport::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("set_sdf_scale", "scale"), &Viewport::set_sdf_scale);
 	ClassDB::bind_method(D_METHOD("get_sdf_scale"), &Viewport::get_sdf_scale);
 
+	ClassDB::bind_method(D_METHOD("set_lod_threshold", "pixels"), &Viewport::set_lod_threshold);
+	ClassDB::bind_method(D_METHOD("get_lod_threshold"), &Viewport::get_lod_threshold);
+
 	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "own_world_3d"), "set_use_own_world_3d", "is_using_own_world_3d");
 	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "world_3d", PROPERTY_HINT_RESOURCE_TYPE, "World3D"), "set_world_3d", "get_world_3d");
 	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "world_2d", PROPERTY_HINT_RESOURCE_TYPE, "World2D", 0), "set_world_2d", "get_world_2d");
@@ -3516,6 +3527,7 @@ void Viewport::_bind_methods() {
 	ADD_PROPERTY(PropertyInfo(Variant::INT, "msaa", PROPERTY_HINT_ENUM, "Disabled,2x,4x,8x,16x,AndroidVR 2x,AndroidVR 4x"), "set_msaa", "get_msaa");
 	ADD_PROPERTY(PropertyInfo(Variant::INT, "screen_space_aa", PROPERTY_HINT_ENUM, "Disabled,FXAA"), "set_screen_space_aa", "get_screen_space_aa");
 	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "use_debanding"), "set_use_debanding", "is_using_debanding");
+	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "lod_threshold", PROPERTY_HINT_RANGE, "0,1024,0.1"), "set_lod_threshold", "get_lod_threshold");
 	ADD_PROPERTY(PropertyInfo(Variant::INT, "debug_draw", PROPERTY_HINT_ENUM, "Disabled,Unshaded,Overdraw,Wireframe"), "set_debug_draw", "get_debug_draw");
 	ADD_GROUP("Canvas Items", "canvas_item_");
 	ADD_PROPERTY(PropertyInfo(Variant::INT, "canvas_item_default_texture_filter", PROPERTY_HINT_ENUM, "Nearest,Linear,MipmapLinear,MipmapNearest"), "set_default_canvas_item_texture_filter", "get_default_canvas_item_texture_filter");
@@ -3590,6 +3602,7 @@ void Viewport::_bind_methods() {
 	BIND_ENUM_CONSTANT(DEBUG_DRAW_SDFGI);
 	BIND_ENUM_CONSTANT(DEBUG_DRAW_SDFGI_PROBES);
 	BIND_ENUM_CONSTANT(DEBUG_DRAW_GI_BUFFER);
+	BIND_ENUM_CONSTANT(DEBUG_DRAW_DISABLE_LOD);
 
 	BIND_ENUM_CONSTANT(DEFAULT_CANVAS_ITEM_TEXTURE_FILTER_NEAREST);
 	BIND_ENUM_CONSTANT(DEFAULT_CANVAS_ITEM_TEXTURE_FILTER_LINEAR);
@@ -3652,6 +3665,8 @@ Viewport::Viewport() {
 	set_shadow_atlas_quadrant_subdiv(2, SHADOW_ATLAS_QUADRANT_SUBDIV_16);
 	set_shadow_atlas_quadrant_subdiv(3, SHADOW_ATLAS_QUADRANT_SUBDIV_64);
 
+	set_lod_threshold(lod_threshold);
+
 	String id = itos(get_instance_id());
 	input_group = "_vp_input" + id;
 	gui_input_group = "_vp_gui_input" + id;
diff --git a/scene/main/viewport.h b/scene/main/viewport.h
index f08f255dde..ffbc3c782a 100644
--- a/scene/main/viewport.h
+++ b/scene/main/viewport.h
@@ -142,6 +142,7 @@ public:
 		DEBUG_DRAW_SDFGI,
 		DEBUG_DRAW_SDFGI_PROBES,
 		DEBUG_DRAW_GI_BUFFER,
+		DEBUG_DRAW_DISABLE_LOD,
 	};
 
 	enum DefaultCanvasItemTextureFilter {
@@ -297,6 +298,8 @@ private:
 	MSAA msaa;
 	ScreenSpaceAA screen_space_aa;
 	bool use_debanding = false;
+	float lod_threshold = 1.0;
+
 	Ref<ViewportTexture> default_texture;
 	Set<ViewportTexture *> viewport_textures;
 
@@ -542,6 +545,9 @@ public:
 	void set_use_debanding(bool p_use_debanding);
 	bool is_using_debanding() const;
 
+	void set_lod_threshold(float p_pixels);
+	float get_lod_threshold() const;
+
 	Vector2 get_camera_coords(const Vector2 &p_viewport_coords) const;
 	Vector2 get_camera_rect_size() const;