Vulkan: Recreate an additional swapchain that stays suboptimal

Only out of date and a lost surface recreated one, so a TV whose mode
changed without a resize (MoltenVK reports SUBOPTIMAL when the layer's
size no longer matches) kept a stretched picture. Like the main
swapchain, it's now recreated after a few SUBOPTIMAL presents in a row.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

Common/GPU/Vulkan/VulkanFrameData.cpp

@@ -187,7 +187,14 @@ void FrameData::PresentExtraSwapchains(VulkanContext *vulkan) {
 		VkResult res = vkQueuePresentKHR(vulkan->GetGraphicsQueue(), &present);
 		if (res == VK_ERROR_OUT_OF_DATE_KHR || res == VK_ERROR_SURFACE_LOST_KHR) {
 			swapchain->outOfDate = true;
-		} else if (res != VK_SUCCESS && res != VK_SUBOPTIMAL_KHR) {
+		} else if (res == VK_SUBOPTIMAL_KHR) {
+			// Like the main swapchain, recreated once it stays that way (a TV's mode changed without a resize).
+			if (++swapchain->suboptimalFrames > VulkanContext::MAX_INFLIGHT_FRAMES) {
+				swapchain->outOfDate = true;
+			}
+		} else if (res == VK_SUCCESS) {
+			swapchain->suboptimalFrames = 0;
+		} else {
 			ERROR_LOG(Log::G3D, "vkQueuePresentKHR failed for an additional swapchain: %s", VulkanResultToString(res));
 		}
 		swapchain->acquired = false;

Common/GPU/Vulkan/VulkanFrameData.h

@@ -94,6 +94,7 @@ struct VKRSwapchain {
 	// Render thread. The image acquired for the frame being run, if any.
 	uint32_t curImage = 0;
 	bool acquired = false;
+	int suboptimalFrames = 0;
 	// Set by the render thread, which can't recreate it. Checked at the start of a frame.
 	std::atomic<bool> outOfDate{false};
 };

Common/GPU/Vulkan/VulkanRenderManager.cpp

@@ -676,6 +676,7 @@ bool VulkanRenderManager::InitExtraSwapchain(VKRSwapchain *swapchain, std::strin
 		swapchain->framebuffers.push_back(framebuffer);
 	}
 	swapchain->outOfDate = false;
+	swapchain->suboptimalFrames = 0;
 	INFO_LOG(Log::G3D, "Created an additional swapchain: %dx%d, %d images", extent.width, extent.height, (int)count);
 	return true;
 }