Add possibility of Render Loopback source to replay

src/RenderSource.cpp

@@ -117,7 +117,7 @@ void RenderSource::update(float dt)
 
     if (!paused_ && session_ && rendered_output_) {
 
-        if (provenance_ == RENDER_EXCLUSIVE) {
+        if (provenance_ == RENDER_EXCLUSIVE || reset_) {
             // temporarily exclude this RenderSource from the rendering
             groups_[View::RENDERING]->visible_ = false;
             // simulate a rendering of the session in a framebuffer
@@ -128,6 +128,8 @@ void RenderSource::update(float dt)
             rendered_output_->end();
             // restore this RenderSource visibility
             groups_[View::RENDERING]->visible_ = true;
+            // done reset
+            reset_ = false;
         }
         // blit session frame to output
         else if (!session_->frame()->blit(rendered_output_))
@@ -152,6 +154,12 @@ void RenderSource::play (bool on)
     paused_ = !on;
 }
 
+void RenderSource::replay ()
+{
+    // request next frame to reset
+    reset_ = true;
+}
+
 glm::vec3 RenderSource::resolution() const
 {
     if (rendered_output_ != nullptr)

src/RenderSource.h

@@ -15,7 +15,7 @@ public:
     void update (float dt) override;
     bool playing () const override { return !paused_; }
     void play (bool) override;
-    void replay () override {}
+    void replay () override;
     bool playable () const  override { return true; }
     guint64 playtime () const override { return runtime_; }
     Failure failed () const override;
@@ -50,6 +50,7 @@ protected:
 
     // control
     bool paused_;
+    bool reset_;
     RenderSourceProvenance provenance_;
 };