Re-expose a simplified version of the stretch properties in SubViewport

3 files changed, 86 insertions, 24 deletions

diff --git a/doc/classes/SubViewport.xml b/doc/classes/SubViewport.xml
index 561e5d1a15..dc3d748496 100644
--- a/doc/classes/SubViewport.xml
+++ b/doc/classes/SubViewport.xml
@@ -7,45 +7,51 @@
 	<tutorials>
 	</tutorials>
 	<methods>
-		<method name="get_size" qualifiers="const">
-			<return type="Vector2i">
-			</return>
-			<description>
-			</description>
-		</method>
-		<method name="set_size">
-			<return type="void">
-			</return>
-			<argument index="0" name="size" type="Vector2i">
-			</argument>
-			<description>
-			</description>
-		</method>
 	</methods>
 	<members>
 		<member name="arvr" type="bool" setter="set_use_arvr" getter="is_using_arvr" default="false">
+			If [code]true[/code], the sub-viewport will be used in AR/VR process.
 		</member>
 		<member name="render_target_clear_mode" type="int" setter="set_clear_mode" getter="get_clear_mode" enum="SubViewport.ClearMode" default="0">
+			The clear mode when the sub-viewport is used as a render target.
 		</member>
 		<member name="render_target_update_mode" type="int" setter="set_update_mode" getter="get_update_mode" enum="SubViewport.UpdateMode" default="2">
+			The update mode when the sub-viewport is used as a render target.
+		</member>
+		<member name="size" type="Vector2i" setter="set_size" getter="get_size" default="Vector2i( 0, 0 )">
+			The width and height of the sub-viewport.
+		</member>
+		<member name="size_2d_override" type="Vector2i" setter="set_size_2d_override" getter="get_size_2d_override" default="Vector2i( 0, 0 )">
+			The 2D size override of the sub-viewport. If either the width or height is [code]0[/code], the override is disabled.
+		</member>
+		<member name="size_2d_override_stretch" type="bool" setter="set_size_2d_override_stretch" getter="is_size_2d_override_stretch_enabled" default="false">
+			If [code]true[/code], the 2D size override affects stretch as well.
 		</member>
 	</members>
 	<constants>
 		<constant name="UPDATE_DISABLED" value="0" enum="UpdateMode">
+			Do not update the render target.
 		</constant>
 		<constant name="UPDATE_ONCE" value="1" enum="UpdateMode">
+			Update the render target once, then switch to [constant UPDATE_DISABLED].
 		</constant>
 		<constant name="UPDATE_WHEN_VISIBLE" value="2" enum="UpdateMode">
+			Update the render target only when it is visible. This is the default value.
 		</constant>
 		<constant name="UPDATE_WHEN_PARENT_VISIBLE" value="3" enum="UpdateMode">
+			Update the render target only when the its parent is visible.
 		</constant>
 		<constant name="UPDATE_ALWAYS" value="4" enum="UpdateMode">
+			Always update the render target.
 		</constant>
 		<constant name="CLEAR_MODE_ALWAYS" value="0" enum="ClearMode">
+			Always clear the render target before drawing.
 		</constant>
 		<constant name="CLEAR_MODE_NEVER" value="1" enum="ClearMode">
+			Never clear the render target.
 		</constant>
 		<constant name="CLEAR_MODE_ONLY_NEXT_FRAME" value="2" enum="ClearMode">
+			Clear the render target next frame, then switch to [constant CLEAR_MODE_NEVER].
 		</constant>
 	</constants>
 </class>
diff --git a/scene/main/viewport.cpp b/scene/main/viewport.cpp
index 5fcd4bf009..06d6e81786 100644
--- a/scene/main/viewport.cpp
+++ b/scene/main/viewport.cpp
@@ -879,13 +879,14 @@ void Viewport::update_canvas_items() {
 	_update_canvas_items(this);
 }
 
-void Viewport::_set_size(const Size2i &p_size, const Size2i &p_size_override, const Rect2i &p_to_screen_rect, const Transform2D &p_stretch_transform, bool p_allocated) {
+void Viewport::_set_size(const Size2i &p_size, const Size2i &p_size_2d_override, const Rect2i &p_to_screen_rect, const Transform2D &p_stretch_transform, bool p_allocated) {
 
-	if (size == p_size && size_allocated == p_allocated && stretch_transform == p_stretch_transform && p_size_override == size_override && to_screen_rect != p_to_screen_rect)
+	if (size == p_size && size_allocated == p_allocated && stretch_transform == p_stretch_transform && p_size_2d_override == size_2d_override && to_screen_rect != p_to_screen_rect)
 		return;
+
 	size = p_size;
 	size_allocated = p_allocated;
-	size_override = p_size_override;
+	size_2d_override = p_size_2d_override;
 	stretch_transform = p_stretch_transform;
 	to_screen_rect = p_to_screen_rect;
 
@@ -904,6 +905,9 @@ void Viewport::_set_size(const Size2i &p_size, const Size2i &p_size_override, co
 Size2i Viewport::_get_size() const {
 	return size;
 }
+Size2i Viewport::_get_size_2d_override() const {
+	return size_2d_override;
+}
 bool Viewport::_is_size_allocated() const {
 	return size_allocated;
 }
@@ -918,8 +922,8 @@ Rect2 Viewport::get_visible_rect() const {
 		r = Rect2(Point2(), size);
 	}
 
-	if (size_override != Size2i()) {
-		r.size = size_override;
+	if (size_2d_override != Size2i()) {
+		r.size = size_2d_override;
 	}
 
 	return r;
@@ -3614,18 +3618,40 @@ void SubViewport::set_use_arvr(bool p_use_arvr) {
 
 	RS::get_singleton()->viewport_set_use_arvr(get_viewport_rid(), arvr);
 }
-
 bool SubViewport::is_using_arvr() {
 	return arvr;
 }
 
 void SubViewport::set_size(const Size2i &p_size) {
-	_set_size(p_size, Size2i(), Rect2i(), Transform2D(), true);
+	_set_size(p_size, _get_size_2d_override(), Rect2i(), _stretch_transform(), true);
 }
 Size2i SubViewport::get_size() const {
 	return _get_size();
 }
 
+void SubViewport::set_size_2d_override(const Size2i &p_size) {
+
+	_set_size(_get_size(), p_size, Rect2i(), _stretch_transform(), true);
+}
+Size2i SubViewport::get_size_2d_override() const {
+
+	return _get_size_2d_override();
+}
+
+void SubViewport::set_size_2d_override_stretch(bool p_enable) {
+
+	if (p_enable == size_2d_override_stretch) {
+		return;
+	}
+
+	size_2d_override_stretch = p_enable;
+	_set_size(_get_size(), _get_size_2d_override(), Rect2i(), _stretch_transform(), true);
+}
+bool SubViewport::is_size_2d_override_stretch_enabled() const {
+
+	return size_2d_override_stretch;
+}
+
 void SubViewport::set_update_mode(UpdateMode p_mode) {
 
 	update_mode = p_mode;
@@ -3641,7 +3667,6 @@ void SubViewport::set_clear_mode(ClearMode p_mode) {
 	clear_mode = p_mode;
 	RS::get_singleton()->viewport_set_clear_mode(get_viewport_rid(), RS::ViewportClearMode(p_mode));
 }
-
 SubViewport::ClearMode SubViewport::get_clear_mode() const {
 
 	return clear_mode;
@@ -3651,6 +3676,18 @@ DisplayServer::WindowID SubViewport::get_window_id() const {
 	return DisplayServer::INVALID_WINDOW_ID;
 }
 
+Transform2D SubViewport::_stretch_transform() {
+
+	Transform2D transform = Transform2D();
+	Size2i view_size_2d_override = _get_size_2d_override();
+	if (size_2d_override_stretch && view_size_2d_override.width > 0 && view_size_2d_override.height > 0) {
+		Size2 scale = _get_size() / view_size_2d_override;
+		transform.scale(scale);
+	}
+
+	return transform;
+}
+
 void SubViewport::_notification(int p_what) {
 
 	if (p_what == NOTIFICATION_ENTER_TREE) {
@@ -3668,6 +3705,12 @@ void SubViewport::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("set_size", "size"), &SubViewport::set_size);
 	ClassDB::bind_method(D_METHOD("get_size"), &SubViewport::get_size);
 
+	ClassDB::bind_method(D_METHOD("set_size_2d_override", "size"), &SubViewport::set_size_2d_override);
+	ClassDB::bind_method(D_METHOD("get_size_2d_override"), &SubViewport::get_size_2d_override);
+
+	ClassDB::bind_method(D_METHOD("set_size_2d_override_stretch", "enable"), &SubViewport::set_size_2d_override_stretch);
+	ClassDB::bind_method(D_METHOD("is_size_2d_override_stretch_enabled"), &SubViewport::is_size_2d_override_stretch_enabled);
+
 	ClassDB::bind_method(D_METHOD("set_update_mode", "mode"), &SubViewport::set_update_mode);
 	ClassDB::bind_method(D_METHOD("get_update_mode"), &SubViewport::get_update_mode);
 
@@ -3675,6 +3718,9 @@ void SubViewport::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("get_clear_mode"), &SubViewport::get_clear_mode);
 
 	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "arvr"), "set_use_arvr", "is_using_arvr");
+	ADD_PROPERTY(PropertyInfo(Variant::VECTOR2, "size"), "set_size", "get_size");
+	ADD_PROPERTY(PropertyInfo(Variant::VECTOR2, "size_2d_override"), "set_size_2d_override", "get_size_2d_override");
+	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "size_2d_override_stretch"), "set_size_2d_override_stretch", "is_size_2d_override_stretch_enabled");
 	ADD_GROUP("Render Target", "render_target_");
 	ADD_PROPERTY(PropertyInfo(Variant::INT, "render_target_clear_mode", PROPERTY_HINT_ENUM, "Always,Never,Next Frame"), "set_clear_mode", "get_clear_mode");
 	ADD_PROPERTY(PropertyInfo(Variant::INT, "render_target_update_mode", PROPERTY_HINT_ENUM, "Disabled,Once,When Visible,Always"), "set_update_mode", "get_update_mode");
@@ -3692,6 +3738,7 @@ void SubViewport::_bind_methods() {
 
 SubViewport::SubViewport() {
 	arvr = false;
+	size_2d_override_stretch = false;
 	update_mode = UPDATE_WHEN_VISIBLE;
 	clear_mode = CLEAR_MODE_ALWAYS;
 }
diff --git a/scene/main/viewport.h b/scene/main/viewport.h
index 8982869783..d603294ed5 100644
--- a/scene/main/viewport.h
+++ b/scene/main/viewport.h
@@ -203,7 +203,7 @@ private:
 	Transform2D stretch_transform;
 
 	Size2i size;
-	Size2i size_override;
+	Size2i size_2d_override;
 	bool size_allocated;
 
 	RID contact_2d_debug;
@@ -434,9 +434,10 @@ private:
 	SubWindowResize _sub_window_get_resize_margin(Window *p_subwindow, const Point2 &p_point);
 
 protected:
-	void _set_size(const Size2i &p_size, const Size2i &p_size_override, const Rect2i &p_to_screen_rect, const Transform2D &p_stretch_transform, bool p_allocated);
+	void _set_size(const Size2i &p_size, const Size2i &p_size_2d_override, const Rect2i &p_to_screen_rect, const Transform2D &p_stretch_transform, bool p_allocated);
 
 	Size2i _get_size() const;
+	Size2i _get_size_2d_override() const;
 	bool _is_size_allocated() const;
 
 	void _notification(int p_what);
@@ -589,19 +590,27 @@ private:
 	UpdateMode update_mode;
 	ClearMode clear_mode;
 	bool arvr;
+	bool size_2d_override_stretch;
 
 protected:
 	static void _bind_methods();
 	virtual DisplayServer::WindowID get_window_id() const;
+	Transform2D _stretch_transform();
 	void _notification(int p_what);
 
 public:
 	void set_size(const Size2i &p_size);
 	Size2i get_size() const;
 
+	void set_size_2d_override(const Size2i &p_size);
+	Size2i get_size_2d_override() const;
+
 	void set_use_arvr(bool p_use_arvr);
 	bool is_using_arvr();
 
+	void set_size_2d_override_stretch(bool p_enable);
+	bool is_size_2d_override_stretch_enabled() const;
+
 	void set_update_mode(UpdateMode p_mode);
 	UpdateMode get_update_mode() const;