output: add a pendingPageFlips() method (#251)

add a way to get if there are pending pageflip so the compositor can
delay its commits.

Author: gulafaran

include/aquamarine/backend/DRM.hpp

@@ -202,6 +202,7 @@ namespace Aquamarine {
         virtual size_t                                                    getGammaSize();
         virtual size_t                                                    getDeGammaSize();
         virtual std::vector<SDRMFormat>                                   getRenderFormats();
+        virtual bool                                                      pendingPageFlip();
         void                                                              releaseMgpuResources();
 
         int                                                               getConnectorID();

include/aquamarine/backend/Headless.hpp

@@ -19,6 +19,7 @@ namespace Aquamarine {
         virtual void                                                      scheduleFrame(const scheduleFrameReason reason = AQ_SCHEDULE_UNKNOWN);
         virtual bool                                                      destroy();
         virtual std::vector<SDRMFormat>                                   getRenderFormats();
+        virtual bool                                                      pendingPageFlip();
 
         Hyprutils::Memory::CWeakPointer<CHeadlessOutput>                  self;
 

include/aquamarine/backend/Wayland.hpp

@@ -50,6 +50,7 @@ namespace Aquamarine {
         virtual Hyprutils::Math::Vector2D                                 cursorPlaneSize();
         virtual bool                                                      destroy();
         virtual std::vector<SDRMFormat>                                   getRenderFormats();
+        virtual bool                                                      pendingPageFlip();
 
         Hyprutils::Memory::CWeakPointer<CWaylandOutput>                   self;
 

include/aquamarine/output/Output.hpp

@@ -171,6 +171,7 @@ namespace Aquamarine {
         virtual size_t                                                    getGammaSize();
         virtual size_t                                                    getDeGammaSize();
         virtual bool                                                      destroy(); // not all backends allow this!!!
+        virtual bool                                                      pendingPageFlip() = 0;
 
         std::string                                                       name, description, make, model, serial;
         SParsedEDID                                                       parsedEDID;

src/backend/Headless.cpp

@@ -55,6 +55,10 @@ std::vector<SDRMFormat> Aquamarine::CHeadlessOutput::getRenderFormats() {
     return backend->getRenderFormats();
 }
 
+bool Aquamarine::CHeadlessOutput::pendingPageFlip() {
+    return false;
+}
+
 Hyprutils::Memory::CSharedPointer<IBackendImplementation> Aquamarine::CHeadlessOutput::getBackend() {
     return backend.lock();
 }

src/backend/Wayland.cpp

@@ -534,6 +534,10 @@ std::vector<SDRMFormat> Aquamarine::CWaylandOutput::getRenderFormats() {
     return backend->getRenderFormats();
 }
 
+bool Aquamarine::CWaylandOutput::pendingPageFlip() {
+    return false;
+}
+
 bool Aquamarine::CWaylandOutput::destroy() {
     events.destroy.emit();
     waylandState.surface->sendAttach(nullptr, 0, 0);

src/backend/drm/DRM.cpp

@@ -2223,6 +2223,10 @@ std::vector<SDRMFormat> Aquamarine::CDRMOutput::getRenderFormats() {
     return connector->crtc->primary->formats;
 }
 
+bool Aquamarine::CDRMOutput::pendingPageFlip() {
+    return connector->isPageFlipPending;
+}
+
 int Aquamarine::CDRMOutput::getConnectorID() {
     return connector->id;
 }