[Fix] (MG_Impl): preserve macOS surface during resize

MobileGL/MG_Backend/DirectVulkan/BackendObject_DirectVulkan.cpp

@@ -434,6 +434,23 @@ namespace MobileGL::MG_Backend::DirectVulkan {
         return BackendObject::CreateEGLWindowSurface(handle);
     }
 
+    Bool BackendObject_DirectVulkan::ResizeEGLWindowSurface(Uint32 width, Uint32 height) {
+        const std::lock_guard<std::recursive_mutex> lock(m_eglStateMutex);
+        if (!m_initialized) {
+            MGLOG_E("DirectVulkan backend not initialized");
+            return false;
+        }
+        if (!pVulkanRenderer) {
+            MGLOG_E("DirectVulkan renderer is not initialized");
+            return false;
+        }
+        if (!BackendObject::ResizeEGLWindowSurface(width, height)) {
+            return false;
+        }
+        pVulkanRenderer->RequestSwapchainResize(width, height);
+        return true;
+    }
+
     Bool BackendObject_DirectVulkan::CreateEGLPbufferSurface(EGLint width, EGLint height) {
         const std::lock_guard<std::recursive_mutex> lock(m_eglStateMutex);
         if (!m_initialized) {

MobileGL/MG_Backend/DirectVulkan/BackendObject_DirectVulkan.h

@@ -22,6 +22,7 @@ namespace MobileGL::MG_Backend::DirectVulkan {
         Bool InitCapabilities() override;
         Bool InitializeEGLDisplay(EGLDisplay dpy, EGLint* major, EGLint* minor) override;
         Bool CreateEGLWindowSurface(const WindowHandle& handle) override;
+        Bool ResizeEGLWindowSurface(Uint32 width, Uint32 height) override;
         Bool CreateEGLPbufferSurface(EGLint width, EGLint height) override;
         Bool MakeEGLCurrent(EGLDisplay dpy, EGLSurface draw, EGLSurface read, EGLContext ctx) override;
         Bool SwapEGLBuffers(EGLDisplay dpy, EGLSurface draw) override;

MobileGL/MG_Backend/DirectVulkan/Renderer/VulkanRenderer.cpp

@@ -5389,9 +5389,15 @@ void main() {
         if (result == VK_ERROR_OUT_OF_DATE_KHR || result == VK_SUBOPTIMAL_KHR) {
             MGLOG_D("Present, vkQueuePresentKHR got %d, recreating swapchain", result);
             RecreateSwapchain();
+            m_swapchainResizeRequested = false;
             result = VK_SUCCESS;
         }
         VK_VERIFY(result, "Present, vkQueuePresentKHR");
+        if (m_swapchainResizeRequested) {
+            MGLOG_D("Present, processing requested swapchain resize");
+            RecreateSwapchain();
+            m_swapchainResizeRequested = false;
+        }
 
         // 3) Advance frame slot.
         m_frameContext.AdvanceToNext();
@@ -5401,6 +5407,7 @@ void main() {
         if (result == VK_ERROR_OUT_OF_DATE_KHR || result == VK_SUBOPTIMAL_KHR) {
             MGLOG_D("Present, vkAcquireNextImageKHR got %d, recreating swapchain", result);
             RecreateSwapchain();
+            m_swapchainResizeRequested = false;
             result =
                 m_frameContext.WaitAndAcquireNextImage(m_device, m_swapchainObject.GetHandle(), m_imageIndexAcquired);
         }
@@ -6105,6 +6112,17 @@ void main() {
         return m_physicalDevice;
     }
 
+    void VulkanRenderer::RequestSwapchainResize(Uint32 width, Uint32 height) {
+        width = std::max<Uint32>(width, 1);
+        height = std::max<Uint32>(height, 1);
+        if (m_config.SurfaceWidth == width && m_config.SurfaceHeight == height) {
+            return;
+        }
+        m_config.SurfaceWidth = width;
+        m_config.SurfaceHeight = height;
+        m_swapchainResizeRequested = true;
+    }
+
     VkInstance VulkanRenderer::GetInstance() const {
         return m_instance;
     }

MobileGL/MG_Backend/DirectVulkan/Renderer/VulkanRenderer.h

@@ -160,6 +160,7 @@ namespace MobileGL::MG_Backend::DirectVulkan {
         VkInstance GetInstance() const;
         Bool IsDrawIndirectCountExtensionEnabled() const;
 
+        void RequestSwapchainResize(Uint32 width, Uint32 height);
         void RecreateSwapchain();
 
     private:
@@ -206,6 +207,7 @@ namespace MobileGL::MG_Backend::DirectVulkan {
         void* m_platformLibrary = nullptr;
         void* m_platformCloseDisplay = nullptr;
         VulkanRendererConfig m_config;
+        Bool m_swapchainResizeRequested = false;
 
         // Vulkan objects
         Bool m_validationLayersEnabled = false;