Cleanup: Avoid complex template type for XR-Swapchain

I rather avoid types like
`std::vector<std::unique_ptr<GHOST_XrSwapchain>>`, which is easy to do
in this case.

3 files changed, 15 insertions, 5 deletions

diff --git a/intern/ghost/intern/GHOST_XrSession.cpp b/intern/ghost/intern/GHOST_XrSession.cpp
index dbe0846a2ca..7be0f300210 100644
--- a/intern/ghost/intern/GHOST_XrSession.cpp
+++ b/intern/ghost/intern/GHOST_XrSession.cpp
@@ -45,7 +45,7 @@ struct OpenXRSessionData {
   XrSpace reference_space;
   XrSpace view_space;
   std::vector<XrView> views;
-  std::vector<std::unique_ptr<GHOST_XrSwapchain>> swapchains;
+  std::vector<GHOST_XrSwapchain> swapchains;
 };
 
 struct GHOST_XrDrawInfo {
@@ -267,8 +267,7 @@ void GHOST_XrSession::prepareDrawing()
            "Failed to get count of view configurations.");
 
   for (const XrViewConfigurationView &view_config : view_configs) {
-    m_oxr->swapchains.push_back(std::unique_ptr<GHOST_XrSwapchain>(
-        new GHOST_XrSwapchain(*m_gpu_binding, m_oxr->session, view_config)));
+    m_oxr->swapchains.emplace_back(*m_gpu_binding, m_oxr->session, view_config);
   }
 
   m_oxr->views.resize(view_count, {XR_TYPE_VIEW});
@@ -443,7 +442,7 @@ XrCompositionLayerProjection GHOST_XrSession::drawLayer(
   r_proj_layer_views.resize(view_count);
 
   for (uint32_t view_idx = 0; view_idx < view_count; view_idx++) {
-    drawView(*m_oxr->swapchains[view_idx],
+    drawView(m_oxr->swapchains[view_idx],
              r_proj_layer_views[view_idx],
              view_location,
              m_oxr->views[view_idx],
diff --git a/intern/ghost/intern/GHOST_XrSwapchain.cpp b/intern/ghost/intern/GHOST_XrSwapchain.cpp
index 4c91bcc2dc3..f50cfde0687 100644
--- a/intern/ghost/intern/GHOST_XrSwapchain.cpp
+++ b/intern/ghost/intern/GHOST_XrSwapchain.cpp
@@ -92,9 +92,19 @@ GHOST_XrSwapchain::GHOST_XrSwapchain(GHOST_IXrGraphicsBinding &gpu_binding,
   m_oxr->swapchain_images = swapchain_images_create(m_oxr->swapchain, gpu_binding);
 }
 
+GHOST_XrSwapchain::GHOST_XrSwapchain(GHOST_XrSwapchain &&other)
+    : m_oxr(std::move(other.m_oxr)),
+      m_image_width(other.m_image_width),
+      m_image_height(other.m_image_height)
+{
+  /* Prevent xrDestroySwapchain call for the moved out item. */
+  other.m_oxr = nullptr;
+}
+
 GHOST_XrSwapchain::~GHOST_XrSwapchain()
 {
-  if (m_oxr->swapchain != XR_NULL_HANDLE) {
+  /* m_oxr may be NULL after move. */
+  if (m_oxr && m_oxr->swapchain != XR_NULL_HANDLE) {
     CHECK_XR_ASSERT(xrDestroySwapchain(m_oxr->swapchain));
   }
 }
diff --git a/intern/ghost/intern/GHOST_XrSwapchain.h b/intern/ghost/intern/GHOST_XrSwapchain.h
index df9cd924dd0..ab0a6736c9c 100644
--- a/intern/ghost/intern/GHOST_XrSwapchain.h
+++ b/intern/ghost/intern/GHOST_XrSwapchain.h
@@ -30,6 +30,7 @@ class GHOST_XrSwapchain {
   GHOST_XrSwapchain(GHOST_IXrGraphicsBinding &gpu_binding,
                     const XrSession &session,
                     const XrViewConfigurationView &view_config);
+  GHOST_XrSwapchain(GHOST_XrSwapchain &&other);
   ~GHOST_XrSwapchain();
 
   XrSwapchainImageBaseHeader *acquireDrawableSwapchainImage();