Wayland: Moved frame-time checking to CWaylandOpenGLDriver instead of viewports

Wayland doesn't require specifics timings, each frame drawn re-queues a new frame
  so treating it as "render the screens" seems to be a safe bet for now
  As indicated in the TODOs once actual work is being done in the event loop
  it should be replaced by a non-blocking option in case no surface is being rendered

Signed-off-by: Alexis Maiquez <almamu@almamu.com>

src/WallpaperEngine/Render/Drivers/CWaylandOpenGLDriver.cpp

@@ -235,6 +235,7 @@ CWaylandOpenGLDriver::CWaylandOpenGLDriver(CApplicationContext& context, CWallpa
     m_fullscreenDetector (context, *this),
     m_output (context, *this),
     m_requestedExit (false),
+    m_context (context),
     CVideoDriver (app)
 {
     m_waylandContext.display = wl_display_connect (nullptr);
@@ -304,11 +305,26 @@ void CWaylandOpenGLDriver::dispatchEventQueue()
         for (const auto& viewport : this->getOutput ().getViewports ())
             this->getApp ().update (viewport.second);
     }
-    
+
+    // TODO: FRAMETIME CONTROL SHOULD GO BACK TO THE CWALLPAPAERAPPLICATION ONCE ACTUAL PARTICLES ARE IMPLEMENTED
+    // TODO: AS THOSE, MORE THAN LIKELY, WILL REQUIRE OF A DIFFERENT PROCESSING RATE
+
+    // TODO: WRITE A NON-BLOCKING VERSION OF THIS ONCE PARTICLE SIMULATION STARTS WORKING
+    // TODO: OTHERWISE wl_display_dispatch WILL BLOCK IF NO SURFACES ARE BEING DRAWN
+    static float startTime, endTime, minimumTime = 1.0f / this->m_context.settings.render.maximumFPS;
+    // get the start time of the frame
+    startTime = this->getRenderTime ();
+
     if (wl_display_dispatch(m_waylandContext.display) == -1)
         m_requestedExit = true;
 
     m_frameCounter ++;
+
+    endTime = this->getRenderTime ();
+
+    // ensure the frame time is correct to not overrun FPS
+    if ((endTime - startTime) < minimumTime)
+        usleep ((minimumTime - (endTime - startTime)) * CLOCKS_PER_SEC);
 }
 
 Detectors::CFullScreenDetector& CWaylandOpenGLDriver::getFullscreenDetector ()

src/WallpaperEngine/Render/Drivers/CWaylandOpenGLDriver.h

@@ -106,6 +106,7 @@ namespace WallpaperEngine::Render::Drivers
         void finishEGL();
 
         uint32_t m_frameCounter;
+        CApplicationContext& m_context;
 
         std::chrono::high_resolution_clock::time_point renderStart = std::chrono::high_resolution_clock::now();
     };

src/WallpaperEngine/Render/Drivers/CX11OpenGLDriver.cpp

@@ -158,6 +158,8 @@ void CX11OpenGLDriver::dispatchEventQueue()
             this->m_output->getImageBuffer ()
         );
 
+    // TODO: FRAMETIME CONTROL SHOULD GO BACK TO THE CWALLPAPAERAPPLICATION ONCE ACTUAL PARTICLES ARE IMPLEMENTED
+    // TODO: AS THOSE, MORE THAN LIKELY, WILL REQUIRE OF A DIFFERENT PROCESSING RATE
     // update the output with the given image
     this->m_output->updateRender ();
     // do buffer swapping first

src/WallpaperEngine/Render/Drivers/Output/CWaylandOutputViewport.cpp

@@ -104,11 +104,6 @@ static void surfaceFrameCallback(void *data, struct wl_callback *cb, uint32_t ti
     viewport->rendering = false;
 
     float renderTime = viewport->getDriver ()->getRenderTime();
-
-    if ((renderTime - viewport->lastTime) < viewport->minimumTime)
-        usleep ((viewport->minimumTime - (renderTime - viewport->lastTime)) * CLOCKS_PER_SEC);
-
-    viewport->lastTime = renderTime;
 }
 
 const struct wl_callback_listener frameListener =
@@ -184,8 +179,6 @@ void CWaylandOutputViewport::setupLS ()
     if (eglMakeCurrent(m_driver->getEGLContext ()->display, eglSurface, eglSurface, m_driver->getEGLContext ()->context) == EGL_FALSE)
         sLog.exception("Failed to make egl current");
 
-    minimumTime = 1.0f / m_driver->getApp ().getContext().settings.render.maximumFPS;
-
     this->m_driver->getOutput ().reset ();
 }
 

src/WallpaperEngine/Render/Drivers/Output/CWaylandOutputViewport.h

@@ -49,7 +49,6 @@ namespace WallpaperEngine::Render::Drivers
             wl_cursor* pointer = nullptr;
             wl_surface* cursorSurface = nullptr;
             bool callbackInitialized = false;
-            float lastTime, minimumTime;
 
             void setupLS ();