added option to disable automatic clearing of viewport render buffer

2 files changed, 29 insertions, 0 deletions

diff --git a/scene/main/viewport.cpp b/scene/main/viewport.cpp
index fa163bf96d..02e009866f 100644
--- a/scene/main/viewport.cpp
+++ b/scene/main/viewport.cpp
@@ -972,6 +972,22 @@ bool Viewport::get_render_target_vflip() const{
 	return render_target_vflip;
 }
 
+void Viewport::set_render_target_clear_on_new_frame(bool p_enable) {
+
+	render_target_clear_on_new_frame=p_enable;
+	VisualServer::get_singleton()->viewport_set_render_target_clear_on_new_frame(viewport,p_enable);
+}
+
+bool Viewport::get_render_target_clear_on_new_frame() const{
+
+	return render_target_clear_on_new_frame;
+}
+
+void Viewport::render_target_clear() {
+
+	//render_target_clear=true;
+	VisualServer::get_singleton()->viewport_render_target_clear(viewport);
+}
 
 void Viewport::set_render_target_filter(bool p_enable) {
 
@@ -1264,6 +1280,11 @@ void Viewport::_bind_methods() {
 
 	ObjectTypeDB::bind_method(_MD("set_render_target_vflip","enable"), &Viewport::set_render_target_vflip);
 	ObjectTypeDB::bind_method(_MD("get_render_target_vflip"), &Viewport::get_render_target_vflip);
+	
+	ObjectTypeDB::bind_method(_MD("set_render_target_clear_on_new_frame","enable"), &Viewport::set_render_target_clear_on_new_frame);
+	ObjectTypeDB::bind_method(_MD("get_render_target_clear_on_new_frame"), &Viewport::get_render_target_clear_on_new_frame);
+	
+	ObjectTypeDB::bind_method(_MD("render_target_clear"), &Viewport::render_target_clear);
 
 	ObjectTypeDB::bind_method(_MD("set_render_target_filter","enable"), &Viewport::set_render_target_filter);
 	ObjectTypeDB::bind_method(_MD("get_render_target_filter"), &Viewport::get_render_target_filter);
@@ -1306,6 +1327,7 @@ void Viewport::_bind_methods() {
 	ADD_PROPERTY( PropertyInfo(Variant::BOOL,"transparent_bg"), _SCS("set_transparent_background"), _SCS("has_transparent_background") );
 	ADD_PROPERTY( PropertyInfo(Variant::BOOL,"render_target/enabled"), _SCS("set_as_render_target"), _SCS("is_set_as_render_target") );
 	ADD_PROPERTY( PropertyInfo(Variant::BOOL,"render_target/v_flip"), _SCS("set_render_target_vflip"), _SCS("get_render_target_vflip") );
+	ADD_PROPERTY( PropertyInfo(Variant::BOOL,"render_target/clear_on_new_frame"), _SCS("set_render_target_clear_on_new_frame"), _SCS("get_render_target_clear_on_new_frame") );
 	ADD_PROPERTY( PropertyInfo(Variant::BOOL,"render_target/filter"), _SCS("set_render_target_filter"), _SCS("get_render_target_filter") );
 	ADD_PROPERTY( PropertyInfo(Variant::BOOL,"render_target/gen_mipmaps"), _SCS("set_render_target_gen_mipmaps"), _SCS("get_render_target_gen_mipmaps") );
 	ADD_PROPERTY( PropertyInfo(Variant::INT,"render_target/update_mode",PROPERTY_HINT_ENUM,"Disabled,Once,When Visible,Always"), _SCS("set_render_target_update_mode"), _SCS("get_render_target_update_mode") );
@@ -1344,6 +1366,8 @@ Viewport::Viewport() {
 	render_target_gen_mipmaps=false;
 	render_target=false;
 	render_target_vflip=false;
+	render_target_clear_on_new_frame=true;
+	//render_target_clear=true;
 	render_target_update_mode=RENDER_TARGET_UPDATE_WHEN_VISIBLE;
 	render_target_texture = Ref<RenderTargetTexture>( memnew( RenderTargetTexture(this) ) );
 
diff --git a/scene/main/viewport.h b/scene/main/viewport.h
index 832a6b6107..d2a22401bd 100644
--- a/scene/main/viewport.h
+++ b/scene/main/viewport.h
@@ -114,6 +114,7 @@ friend class RenderTargetTexture;
 
 	bool transparent_bg;
 	bool render_target_vflip;
+	bool render_target_clear_on_new_frame;
 	bool render_target_filter;
 	bool render_target_gen_mipmaps;
 
@@ -220,6 +221,10 @@ public:
 	void set_render_target_vflip(bool p_enable);
 	bool get_render_target_vflip() const;
 
+	void set_render_target_clear_on_new_frame(bool p_enable);
+	bool get_render_target_clear_on_new_frame() const;
+	void render_target_clear();
+
 	void set_render_target_filter(bool p_enable);
 	bool get_render_target_filter() const;