Window resize (#105)

base/vulkanexamplebase.cpp

@@ -966,6 +966,23 @@ void VulkanExampleBase::handleMessages(HWND hWnd, UINT uMsg, WPARAM wParam, LPAR
 			mousePos.y = (float)posy;
 		}
 		break;
+	case WM_SIZE:
+		if ((prepared) && (wParam != SIZE_MINIMIZED))
+		{
+			destWidth = LOWORD(lParam);
+			destHeight = HIWORD(lParam);
+			if ((wParam == SIZE_MAXIMIZED) || (wParam == SIZE_RESTORED))
+			{
+				windowResize();
+			}
+		}
+		break;
+	case WM_EXITSIZEMOVE:
+		if ((prepared) && ((destWidth != width) || (destHeight != height)))
+		{
+			windowResize();
+		}
+		break;
 	}
 }
 #elif defined(__ANDROID__)
@@ -1182,6 +1199,11 @@ void VulkanExampleBase::keyPressed(uint32_t keyCode)
 	// Can be overriden in derived class
 }
 
+void VulkanExampleBase::buildCommandBuffers()
+{
+	// Can be overriden in derived class
+}
+
 VkBool32 VulkanExampleBase::getMemoryType(uint32_t typeBits, VkFlags properties, uint32_t * typeIndex)
 {
 	for (uint32_t i = 0; i < 32; i++)
@@ -1352,6 +1374,56 @@ void VulkanExampleBase::setupRenderPass()
 	assert(!err);
 }
 
+void VulkanExampleBase::windowResize()
+{
+	if (!prepared)
+	{
+		return;
+	}
+	prepared = false;
+
+	// Recreate swap chain
+	width = destWidth;
+	height = destHeight;
+	createSetupCommandBuffer();
+	setupSwapChain();
+
+	// Recreate the frame buffers
+
+	vkDestroyImageView(device, depthStencil.view, nullptr);
+	vkDestroyImage(device, depthStencil.image, nullptr);
+	vkFreeMemory(device, depthStencil.mem, nullptr);
+	setupDepthStencil();
+	
+	for (uint32_t i = 0; i < frameBuffers.size(); i++)
+	{
+		vkDestroyFramebuffer(device, frameBuffers[i], nullptr);
+	}
+	setupFrameBuffer();
+
+	flushSetupCommandBuffer();
+
+	// Command buffers need to be recreated as they may store
+	// references to the recreated frame buffer
+	destroyCommandBuffers();
+	createCommandBuffers();
+	buildCommandBuffers();
+
+	vkQueueWaitIdle(queue);
+	vkDeviceWaitIdle(device);
+
+	// Notify derived class
+	windowResized();
+	viewChanged();
+
+	prepared = true;
+}
+
+void VulkanExampleBase::windowResized()
+{
+	// Can be overrdiden in derived class
+}
+
 void VulkanExampleBase::initSwapchain()
 {
 #if defined(_WIN32)

base/vulkanexamplebase.h

@@ -53,6 +53,11 @@ private:
 	VkResult createDevice(VkDeviceQueueCreateInfo requestedQueues, bool enableValidation);
 	// Get window title with example name, device, et.
 	std::string getWindowTitle();
+	// Destination dimensions for resizing the window
+	uint32_t destWidth;
+	uint32_t destHeight;
+	// Called if the window is resized and some resources have to be recreatesd
+	void windowResize();
 protected:
 	// Last frame time, measured using a high performance timer (if available)
 	float frameTimer = 1.0f;
@@ -211,6 +216,13 @@ public:
 	// Called if a key is pressed
 	// Can be overriden in derived class to do custom key handling
 	virtual void keyPressed(uint32_t keyCode);
+	// Called when the window has been resized
+	// Can be overriden in derived class to recreate or rebuild resources attached to the frame buffer / swapchain
+	virtual void windowResized();
+	// Pure virtual function to be overriden by the dervice class
+	// Called in case of an event where e.g. the framebuffer has to be rebuild and thus
+	// all command buffers that may reference this
+	virtual void buildCommandBuffers();
 
 	// Get memory type for a given memory allocation (flags and bits)
 	VkBool32 getMemoryType(uint32_t typeBits, VkFlags properties, uint32_t *typeIndex);