Utilize external surf id to decide using which external VR surface.

Author: daoshengmu

app/src/main/cpp/BrowserWorld.cpp

@@ -1149,10 +1149,11 @@ BrowserWorld::DrawImmersive() {
   m.device->StartFrame();
   VRB_GL_CHECK(glDepthMask(GL_FALSE));
   m.externalVR->PushFramePoses(m.device->GetHeadTransform(), m.controllers->GetControllers(), m.context->GetTimestamp());
+  mozilla::gfx::VRLayerTextureType surfaceType;
   int32_t surfaceHandle, textureWidth, textureHeight = 0;
   device::EyeRect leftEye, rightEye;
   bool aDiscardFrame = !m.externalVR->WaitFrameResult();
-  m.externalVR->GetFrameResult(surfaceHandle, textureWidth, textureHeight, leftEye, rightEye);
+  m.externalVR->GetFrameResult(surfaceType, surfaceHandle, textureWidth, textureHeight, leftEye, rightEye);
   ExternalVR::VRState state = m.externalVR->GetVRState();
   if (state == ExternalVR::VRState::Rendering) {
     if (!aDiscardFrame) {
@@ -1171,13 +1172,23 @@ BrowserWorld::DrawImmersive() {
 #endif // !defined(VRBROWSER_NO_VR_API)
       }
     }
+
+    if (surfaceType == mozilla::gfx::VRLayerTextureType::LayerTextureType_ExternalVRSurface) {
+      m.device->SetExternalSurfId(surfaceHandle);
+    }
     m.device->EndFrame(aDiscardFrame);
     m.blitter->EndFrame();
   } else {
     if (surfaceHandle != 0) {
       m.blitter->CancelFrame(surfaceHandle);
     }
     DrawLoadingAnimation();
+
+    if ((m.device->GetDeviceType() != device::OculusGo) &&
+        (m.device->GetDeviceType() != device::OculusQuest)) {
+      // Reset surface id when existing the external immersive mode.
+      m.device->SetExternalSurfId(-1);
+    }
     m.device->EndFrame(false);
   }
 }

app/src/main/cpp/DeviceDelegate.h

@@ -67,6 +67,7 @@ class DeviceDelegate {
   virtual void StartFrame() = 0;
   virtual void BindEye(const device::Eye aWhich) = 0;
   virtual void EndFrame(bool aDiscard = false) = 0;
+  virtual void SetExternalSurfId(int32_t aSurfId) {}
   virtual VRLayerQuadPtr CreateLayerQuad(int32_t aWidth, int32_t aHeight,
                                          VRLayerSurface::SurfaceType aSurfaceType) { return nullptr; }
   virtual VRLayerQuadPtr CreateLayerQuad(const VRLayerSurfacePtr& aMoveLayer) { return nullptr; }

app/src/main/cpp/ExternalVR.cpp

@@ -478,8 +478,9 @@ ExternalVR::CompleteEnumeration()
 
 
 void
-ExternalVR::GetFrameResult(int32_t& aSurfaceHandle, int32_t& aTextureWidth, int32_t& aTextureHeight,
+ExternalVR::GetFrameResult(mozilla::gfx::VRLayerTextureType& aSurfaceType, int32_t& aSurfaceHandle, int32_t& aTextureWidth, int32_t& aTextureHeight,
     device::EyeRect& aLeftEye, device::EyeRect& aRightEye) const {
+  aSurfaceType = m.browser.layerState[0].layer_stereo_immersive.textureType;
   aSurfaceHandle = (int32_t)m.browser.layerState[0].layer_stereo_immersive.textureHandle;
   mozilla::gfx::VRLayerEyeRect& left = m.browser.layerState[0].layer_stereo_immersive.leftEyeRect;
   mozilla::gfx::VRLayerEyeRect& right = m.browser.layerState[0].layer_stereo_immersive.rightEyeRect;

app/src/main/cpp/ExternalVR.h

@@ -10,6 +10,7 @@
 #include "Controller.h"
 #include "DeviceDelegate.h"
 #include "Device.h"
+#include "moz_external_vr.h"
 #include <memory>
 #include <string>
 #include <vector>
@@ -54,7 +55,8 @@ class ExternalVR : public ImmersiveDisplay {
   VRState GetVRState() const;
   void PushFramePoses(const vrb::Matrix& aHeadTransform, const std::vector<Controller>& aControllers, const double aTimestamp);
   bool WaitFrameResult();
-  void GetFrameResult(int32_t& aSurfaceHandle,
+  void GetFrameResult(mozilla::gfx::VRLayerTextureType& aSurfaceType,
+                      int32_t& aSurfaceHandle,
                       int32_t& aTextureWidth,
                       int32_t& aTextureHeight,
                       device::EyeRect& aLeftEye,