From 19afba3f718897bd91fe1be99a9b4f61f6728858 Mon Sep 17 00:00:00 2001
From: saschawillems <webmaster@saschawillems.de>
Date: Sun, 3 Jun 2018 09:38:14 +0200
Subject: [PATCH] Base class wait fences

---
 base/vulkanexamplebase.cpp | 14 ++++++++++++++
 base/vulkanexamplebase.h   |  3 +++
 2 files changed, 17 insertions(+)

diff --git a/base/vulkanexamplebase.cpp b/base/vulkanexamplebase.cpp
index ff41a5b8..4ae9f396 100644
--- a/base/vulkanexamplebase.cpp
+++ b/base/vulkanexamplebase.cpp
@@ -188,6 +188,7 @@ void VulkanExampleBase::prepare()
 	createCommandPool();
 	setupSwapChain();
 	createCommandBuffers();
+	createSynchronizationPrimitives();
 	setupDepthStencil();
 	setupRenderPass();
 	createPipelineCache();
@@ -798,6 +799,9 @@ VulkanExampleBase::~VulkanExampleBase()
 	vkDestroySemaphore(device, semaphores.presentComplete, nullptr);
 	vkDestroySemaphore(device, semaphores.renderComplete, nullptr);
 	vkDestroySemaphore(device, semaphores.overlayComplete, nullptr);
+	for (auto& fence : waitFences) {
+		vkDestroyFence(device, fence, nullptr);
+	}
 
 	if (UIOverlay) {
 		delete UIOverlay;
@@ -1956,6 +1960,16 @@ void VulkanExampleBase::mouseMoved(double x, double y, bool & handled) {}
 
 void VulkanExampleBase::buildCommandBuffers() {}
 
+void VulkanExampleBase::createSynchronizationPrimitives()
+{
+	// Wait fences to sync command buffer access
+	VkFenceCreateInfo fenceCreateInfo = vks::initializers::fenceCreateInfo(VK_FENCE_CREATE_SIGNALED_BIT);
+	waitFences.resize(drawCmdBuffers.size());
+	for (auto& fence : waitFences) {
+		VK_CHECK_RESULT(vkCreateFence(device, &fenceCreateInfo, nullptr, &fence));
+	}
+}
+
 void VulkanExampleBase::createCommandPool()
 {
 	VkCommandPoolCreateInfo cmdPoolInfo = {};
diff --git a/base/vulkanexamplebase.h b/base/vulkanexamplebase.h
index faeaafc6..a2f8d154 100644
--- a/base/vulkanexamplebase.h
+++ b/base/vulkanexamplebase.h
@@ -131,6 +131,7 @@ protected:
 		// UI overlay submission and execution
 		VkSemaphore overlayComplete;
 	} semaphores;
+	std::vector<VkFence> waitFences;
 public: 
 	bool prepared = false;
 	uint32_t width = 1280;
@@ -338,6 +339,8 @@ public:
 	// all command buffers that may reference this
 	virtual void buildCommandBuffers();
 
+	void createSynchronizationPrimitives();
+
 	// Creates a new (graphics) command pool object storing command buffers
 	void createCommandPool();
 	// Setup default depth and stencil views