Cleanup Rendering and Display view code to get texture of output

src/DisplaysView.cpp

@@ -132,18 +132,14 @@ void DisplaysView::update(float dt)
 {
     View::update(dt);
 
-    // a more complete update is requested
-    if (View::need_deep_update_ > 0 && Mixer::manager().view() == this ) {
+    // specific update when this view is active
+    if ( Mixer::manager().view() == this ) {
 
         // update rendering of render frame
-        FrameBuffer *render = Mixer::manager().session()->frame();
-        if (render) {
-            output_ar = render->aspectRatio();
-            for (int i = 0; i < MAX_OUTPUT_WINDOW; ++i)
-                windows_[i].render_->setTextureIndex( Rendering::manager().outputWindow(i).texture() );
-        }
-        else
-            output_ar = 1.f;
+        for (int i = 0; i < MAX_OUTPUT_WINDOW; ++i)
+            windows_[i].render_->setTextureIndex( Rendering::manager().outputWindow(i).texture() );
+
+        output_ar = Mixer::manager().session()->frame()->aspectRatio();
     }
 }
 
@@ -234,7 +230,6 @@ void DisplaysView::draw()
 
         // update visible flag
         windows_[i].root_->visible_ = true;
-        windows_[i].render_->visible_ = !Settings::application.render.disabled;
         windows_[i].icon_->visible_ = Settings::application.render.disabled;
 
         if (windows_[i].render_->visible_) {
@@ -400,8 +395,7 @@ void DisplaysView::draw()
 
             // Pattern output
             ImGui::SameLine(0, 50);
-            if ( ImGuiToolkit::ButtonIconToggle(10,1,11,1, &Settings::application.windows[1+current_window_].show_pattern, "Test pattern") )
-                View::need_deep_update_ += 2; // two frames update to get pattern initialized
+            ImGuiToolkit::ButtonIconToggle(10,1,11,1, &Settings::application.windows[1+current_window_].show_pattern, "Test pattern");
 
 //            // White ballance
 //            static DialogToolkit::ColorPickerDialog whitedialog;

src/Mixer.cpp

@@ -1526,7 +1526,7 @@ void Mixer::setResolution(glm::vec3 res)
 {
     if (session_) {
         session_->setResolution(res);
-        View::need_deep_update_+=2;
+        ++View::need_deep_update_;
         std::ostringstream info;
         info << "Session resolution changed to " << res.x << "x" << res.y;
         Log::Info("%s", info.str().c_str());

src/RenderingManager.cpp

@@ -489,7 +489,7 @@ void Rendering::draw()
         g_timer_start(timer);
     }
 
-    // swap GL buffers
+    // swap all GL buffers at once
     main_.swap();
     for (auto it = outputs_.begin(); it != outputs_.end(); ++it)
         it->swap();
@@ -1019,8 +1019,9 @@ bool RenderingWindow::init(int index, GLFWwindow *share)
     //
     // Stream pattern
     //
-    pattern_->open("videotestsrc pattern=smpte", 1280, 720);
+    pattern_->open("videotestsrc pattern=smpte", 1024, 1024);
     pattern_->play(true);
+    textureid_ = Resource::getTextureBlack();
 
     return true;
 }
@@ -1044,6 +1045,7 @@ void RenderingWindow::terminate()
     surface_ = nullptr;
     fbo_     = 0;
     index_   = -1;
+    textureid_ = Resource::getTextureBlack();
 }
 
 void RenderingWindow::show()
@@ -1088,6 +1090,7 @@ void RenderingWindow::swap()
 
 bool RenderingWindow::draw(FrameBuffer *fb)
 {
+    // cannot draw if there is no window or invalid framebuffer
     if (!window_ || !fb)
         return false;
 
@@ -1108,8 +1111,12 @@ bool RenderingWindow::draw(FrameBuffer *fb)
         ShadingProgram::enduse();
 
         // draw geometry
-        if (!Settings::application.render.disabled)
-        {
+        if (Settings::application.render.disabled)
+            // no draw; indicate texture is black
+            textureid_ = Resource::getTextureBlack();
+        else {
+            // normal draw
+
             // VAO is not shared between multiple contexts of different windows
             // so we have to create a new VAO for rendering the surface in this window
             if (surface_ == nullptr)
@@ -1130,6 +1137,7 @@ bool RenderingWindow::draw(FrameBuffer *fb)
 
             // Display option: draw calibration pattern
             if ( Settings::application.windows[index_].show_pattern) {
+                // draw pattern texture
                 pattern_->update();
                 textureid_ = pattern_->texture();
             }