swapchain: add rollback

hyprwm · Jul 4, 2024 · d3bacb4 · d3bacb4
1 parent 8d1d103
commit d3bacb4
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Showing 2 changed files with 11 additions and 0 deletions.
diff --git a/include/aquamarine/allocator/Swapchain.hpp b/include/aquamarine/allocator/Swapchain.hpp
@@ -24,6 +24,11 @@ namespace Aquamarine {
         Hyprutils::Memory::CSharedPointer<IBuffer>           next(int* age);
         const SSwapchainOptions&                             currentOptions();
 
+        // rolls the buffers back, marking the last consumed as the next valid.
+        // useful if e.g. a commit fails and we don't wanna write to the previous buffer that is
+        // in use.
+        void rollback();
+
       private:
         CSwapchain(Hyprutils::Memory::CSharedPointer<IAllocator> allocator_, Hyprutils::Memory::CSharedPointer<IBackendImplementation> backendImpl_);
 

diff --git a/src/allocator/Swapchain.cpp b/src/allocator/Swapchain.cpp
@@ -114,3 +114,9 @@ bool Aquamarine::CSwapchain::contains(Hyprutils::Memory::CSharedPointer<IBuffer>
 const SSwapchainOptions& Aquamarine::CSwapchain::currentOptions() {
     return options;
 }
+
+void Aquamarine::CSwapchain::rollback() {
+    lastAcquired--;
+    if (lastAcquired < 0)
+        lastAcquired = options.length - 1;
+}