Experimental support for windows with per-pixel transparency (macOS, X11 and Windows).

4 files changed, 29 insertions, 0 deletions

diff --git a/core/bind/core_bind.cpp b/core/bind/core_bind.cpp
index 20adf7ff02..7968182149 100644
--- a/core/bind/core_bind.cpp
+++ b/core/bind/core_bind.cpp
@@ -332,6 +332,14 @@ void _OS::set_borderless_window(bool p_borderless) {
 	OS::get_singleton()->set_borderless_window(p_borderless);
 }
 
+bool _OS::get_window_per_pixel_transparency_enabled() const {
+	return OS::get_singleton()->get_window_per_pixel_transparency_enabled();
+}
+
+void _OS::set_window_per_pixel_transparency_enabled(bool p_enabled) {
+	OS::get_singleton()->set_window_per_pixel_transparency_enabled(p_enabled);
+}
+
 bool _OS::get_borderless_window() const {
 	return OS::get_singleton()->get_borderless_window();
 }
@@ -1063,6 +1071,9 @@ void _OS::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("set_borderless_window", "borderless"), &_OS::set_borderless_window);
 	ClassDB::bind_method(D_METHOD("get_borderless_window"), &_OS::get_borderless_window);
 
+	ClassDB::bind_method(D_METHOD("get_window_per_pixel_transparency_enabled"), &_OS::get_window_per_pixel_transparency_enabled);
+	ClassDB::bind_method(D_METHOD("set_window_per_pixel_transparency_enabled", "enabled"), &_OS::set_window_per_pixel_transparency_enabled);
+
 	ClassDB::bind_method(D_METHOD("set_ime_position", "position"), &_OS::set_ime_position);
 
 	ClassDB::bind_method(D_METHOD("set_screen_orientation", "orientation"), &_OS::set_screen_orientation);
@@ -1180,6 +1191,7 @@ void _OS::_bind_methods() {
 	ADD_PROPERTY(PropertyInfo(Variant::INT, "screen_orientation", PROPERTY_HINT_ENUM, "Landscape,Portrait,Reverse Landscape,Reverse Portrait,Sensor Landscape,Sensor Portrait,Sensor"), "set_screen_orientation", "get_screen_orientation");
 	ADD_GROUP("Window", "window_");
 	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "window_borderless"), "set_borderless_window", "get_borderless_window");
+	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "window_per_pixel_transparency_enabled"), "set_window_per_pixel_transparency_enabled", "get_window_per_pixel_transparency_enabled");
 	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "window_fullscreen"), "set_window_fullscreen", "is_window_fullscreen");
 	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "window_maximized"), "set_window_maximized", "is_window_maximized");
 	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "window_minimized"), "set_window_minimized", "is_window_minimized");
diff --git a/core/bind/core_bind.h b/core/bind/core_bind.h
index c40abd51f6..1de05b347a 100644
--- a/core/bind/core_bind.h
+++ b/core/bind/core_bind.h
@@ -179,6 +179,9 @@ public:
 	virtual void set_borderless_window(bool p_borderless);
 	virtual bool get_borderless_window() const;
 
+	virtual bool get_window_per_pixel_transparency_enabled() const;
+	virtual void set_window_per_pixel_transparency_enabled(bool p_enabled);
+
 	virtual void set_ime_position(const Point2 &p_pos);
 
 	Error native_video_play(String p_path, float p_volume, String p_audio_track, String p_subtitle_track);
diff --git a/core/os/os.cpp b/core/os/os.cpp
index 618a4bbac3..7ea92db4c3 100644
--- a/core/os/os.cpp
+++ b/core/os/os.cpp
@@ -672,6 +672,7 @@ OS::OS() {
 	_render_thread_mode = RENDER_THREAD_SAFE;
 
 	_allow_hidpi = false;
+	_allow_layered = false;
 	_stack_bottom = (void *)(&stack_bottom);
 
 	_logger = NULL;
diff --git a/core/os/os.h b/core/os/os.h
index 5a2c998782..0bd331df4a 100644
--- a/core/os/os.h
+++ b/core/os/os.h
@@ -65,6 +65,7 @@ class OS {
 	int _exit_code;
 	int _orientation;
 	bool _allow_hidpi;
+	bool _allow_layered;
 	bool _use_vsync;
 
 	char *last_error;
@@ -102,6 +103,8 @@ public:
 		bool maximized;
 		bool always_on_top;
 		bool use_vsync;
+		bool layered_splash;
+		bool layered;
 		float get_aspect() const { return (float)width / (float)height; }
 		VideoMode(int p_width = 1024, int p_height = 600, bool p_fullscreen = false, bool p_resizable = true, bool p_borderless_window = false, bool p_maximized = false, bool p_always_on_top = false, bool p_use_vsync = false) {
 			width = p_width;
@@ -112,6 +115,8 @@ public:
 			maximized = p_maximized;
 			always_on_top = p_always_on_top;
 			use_vsync = p_use_vsync;
+			layered = false;
+			layered_splash = false;
 		}
 	};
 
@@ -208,6 +213,13 @@ public:
 	virtual void set_borderless_window(bool p_borderless) {}
 	virtual bool get_borderless_window() { return 0; }
 
+	virtual bool get_window_per_pixel_transparency_enabled() const { return false; }
+	virtual void set_window_per_pixel_transparency_enabled(bool p_enabled) {}
+
+	virtual uint8_t *get_layered_buffer_data() { return NULL; }
+	virtual Size2 get_layered_buffer_size() { return Size2(0, 0); }
+	virtual void swap_layered_buffer() {}
+
 	virtual void set_ime_position(const Point2 &p_pos) {}
 	virtual void set_ime_intermediate_text_callback(ImeCallback p_callback, void *p_inp) {}
 
@@ -468,6 +480,7 @@ public:
 	virtual void force_process_input(){};
 	bool has_feature(const String &p_feature);
 
+	bool is_layered_allowed() const { return _allow_layered; }
 	bool is_hidpi_allowed() const { return _allow_hidpi; }
 	OS();
 	virtual ~OS();