Compare commits
1
Commits
| Author | SHA1 | Date | |
|---|---|---|---|
 xsl
|
3c5c720486 |
+163
-46
@@ -70,7 +70,9 @@ void Application::initVulkan()
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pickPhysicalDevice(physicalDevice, surface); // 选择物理设备
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createLogicalDevice(); // 创建逻辑设备
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createSwapChain(); // 创建交换链
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createImages();
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createImageViews(); // 创建交换链图像视图
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createColorResources();
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createRenderPass(); // 创建渲染流程
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createPipelineLayout(); // 在这里调用
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createGraphicsPipeline(); // 创建图形管线
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@@ -81,6 +83,14 @@ void Application::initVulkan()
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inited = true;
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}
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void Application::createImages()
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{
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uint32_t imageCount = 0;
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vkGetSwapchainImagesKHR(device, swapChain, &imageCount, nullptr);
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swapChainImages.resize(imageCount);
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vkGetSwapchainImagesKHR(device, swapChain, &imageCount, swapChainImages.data());
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}
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void Application::createImageViews() {
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swapChainImageViews.resize(swapChainImages.size());
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@@ -105,20 +115,23 @@ void Application::createImageViews() {
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}
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}
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}
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void Application::createFramebuffers() {
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void Application::createFramebuffers()
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{
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swapChainFramebuffers.resize(swapChainImageViews.size());
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for (size_t i = 0; i < swapChainImageViews.size(); i++) {
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VkImageView attachments[] = {
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swapChainImageViews[i]
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for (size_t i = 0; i < swapChainImageViews.size(); i++)
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{
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std::vector<VkImageView> attachments =
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{
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colorImageView, // 0: MSAA color attachment
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swapChainImageViews[i] // 1: resolve target (swapchain)
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};
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VkFramebufferCreateInfo framebufferInfo{};
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framebufferInfo.sType = VK_STRUCTURE_TYPE_FRAMEBUFFER_CREATE_INFO;
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framebufferInfo.renderPass = renderPass;
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framebufferInfo.attachmentCount = 1;
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framebufferInfo.pAttachments = attachments;
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framebufferInfo.attachmentCount = static_cast<uint32_t>(attachments.size());
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framebufferInfo.pAttachments = attachments.data();
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framebufferInfo.width = swapChainExtent.width;
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framebufferInfo.height = swapChainExtent.height;
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framebufferInfo.layers = 1;
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@@ -232,15 +245,12 @@ void Application::createSwapChain() {
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throw std::runtime_error("failed to create swap chain!");
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}
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vkGetSwapchainImagesKHR(device, swapChain, &imageCount, nullptr);
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swapChainImages.resize(imageCount);
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vkGetSwapchainImagesKHR(device, swapChain, &imageCount, swapChainImages.data());
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swapChainImageFormat = surfaceFormat.format;
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swapChainExtent = extent;
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}
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void Application::createPipelineLayout() {
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VkPipelineLayoutCreateInfo pipelineLayoutInfo{};
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pipelineLayoutInfo.sType = VK_STRUCTURE_TYPE_PIPELINE_LAYOUT_CREATE_INFO;
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@@ -327,7 +337,7 @@ void Application::createGraphicsPipeline() {
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VkPipelineMultisampleStateCreateInfo multisampling{};
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multisampling.sType = VK_STRUCTURE_TYPE_PIPELINE_MULTISAMPLE_STATE_CREATE_INFO;
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multisampling.sampleShadingEnable = VK_FALSE;
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multisampling.rasterizationSamples = VK_SAMPLE_COUNT_1_BIT;
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multisampling.rasterizationSamples = VK_SAMPLE_COUNT_8_BIT;
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// 颜色混合状态
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VkPipelineColorBlendAttachmentState colorBlendAttachment{};
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@@ -365,31 +375,62 @@ void Application::createGraphicsPipeline() {
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}
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void Application::createRenderPass() {
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// 1. 多重采样颜色附件（8x）
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VkAttachmentDescription colorAttachment{};
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colorAttachment.format = swapChainImageFormat;
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colorAttachment.samples = VK_SAMPLE_COUNT_1_BIT;
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colorAttachment.samples = VK_SAMPLE_COUNT_8_BIT; // ←←← 8x
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colorAttachment.loadOp = VK_ATTACHMENT_LOAD_OP_CLEAR;
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colorAttachment.storeOp = VK_ATTACHMENT_STORE_OP_STORE;
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colorAttachment.storeOp = VK_ATTACHMENT_STORE_OP_DONT_CARE; // 不需要存储，因为会 resolve
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colorAttachment.stencilLoadOp = VK_ATTACHMENT_LOAD_OP_DONT_CARE;
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colorAttachment.stencilStoreOp = VK_ATTACHMENT_STORE_OP_DONT_CARE;
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colorAttachment.initialLayout = VK_IMAGE_LAYOUT_UNDEFINED;
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colorAttachment.finalLayout = VK_IMAGE_LAYOUT_PRESENT_SRC_KHR;
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colorAttachment.finalLayout = VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL;
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// 2. Resolve 附件（普通 swapchain image）
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VkAttachmentDescription resolveAttachment{};
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resolveAttachment.format = swapChainImageFormat;
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resolveAttachment.samples = VK_SAMPLE_COUNT_1_BIT; // ←←← resolve 到单采样
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resolveAttachment.loadOp = VK_ATTACHMENT_LOAD_OP_DONT_CARE;
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resolveAttachment.storeOp = VK_ATTACHMENT_STORE_OP_STORE;
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resolveAttachment.stencilLoadOp = VK_ATTACHMENT_LOAD_OP_DONT_CARE;
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resolveAttachment.stencilStoreOp = VK_ATTACHMENT_STORE_OP_DONT_CARE;
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resolveAttachment.initialLayout = VK_IMAGE_LAYOUT_UNDEFINED;
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resolveAttachment.finalLayout = VK_IMAGE_LAYOUT_PRESENT_SRC_KHR;
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// 引用
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VkAttachmentReference colorAttachmentRef{};
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colorAttachmentRef.attachment = 0;
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colorAttachmentRef.layout = VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL;
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VkAttachmentReference resolveAttachmentRef{};
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resolveAttachmentRef.attachment = 1;
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resolveAttachmentRef.layout = VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL;
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// Subpass：指定 color 和 resolve
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VkSubpassDescription subpass{};
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subpass.pipelineBindPoint = VK_PIPELINE_BIND_POINT_GRAPHICS;
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subpass.colorAttachmentCount = 1;
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subpass.pColorAttachments = &colorAttachmentRef;
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subpass.pResolveAttachments = &resolveAttachmentRef; // ←←← 关键！
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// Subpass 依赖（可选但推荐）
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VkSubpassDependency dependency{};
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dependency.srcSubpass = VK_SUBPASS_EXTERNAL;
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dependency.dstSubpass = 0;
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dependency.srcStageMask = VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT;
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dependency.srcAccessMask = 0;
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dependency.dstStageMask = VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT;
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dependency.dstAccessMask = VK_ACCESS_COLOR_ATTACHMENT_WRITE_BIT;
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std::vector<VkAttachmentDescription> attachments = { colorAttachment, resolveAttachment };
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VkRenderPassCreateInfo renderPassInfo{};
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renderPassInfo.sType = VK_STRUCTURE_TYPE_RENDER_PASS_CREATE_INFO;
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renderPassInfo.attachmentCount = 1;
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renderPassInfo.pAttachments = &colorAttachment;
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renderPassInfo.attachmentCount = static_cast<uint32_t>(attachments.size());
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renderPassInfo.pAttachments = attachments.data();
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renderPassInfo.subpassCount = 1;
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renderPassInfo.pSubpasses = &subpass;
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renderPassInfo.dependencyCount = 1;
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renderPassInfo.pDependencies = &dependency;
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if (vkCreateRenderPass(device, &renderPassInfo, nullptr, &renderPass) != VK_SUCCESS) {
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throw std::runtime_error("failed to create render pass!");
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@@ -397,7 +438,6 @@ void Application::createRenderPass() {
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}
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void Application::createCommandPool() {
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QueueFamilyIndices queueFamilyIndices = findQueueFamilies(physicalDevice, surface);
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@@ -488,17 +528,18 @@ void Application::recordCommandBuffer(VkCommandBuffer commandBuffer, uint32_t im
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void Application::drawLeft()
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{
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if(showDrawDebug)
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cout << "call drawLeft curFrame:" << to_string(currentFrame) << endl;
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// 1. 等待前一帧完成
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vkWaitForFences(device, 1, &inFlightFences_Left, VK_TRUE, UINT64_MAX);
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cout << "vkWaitForFences inFlightFences_Left" << endl;
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if (showDrawDebug) cout << "vkWaitForFences inFlightFences_Left" << endl;
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// 2. 获取交换链图像 - 使用当前帧的信号量
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uint32_t imageIndex;
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VkResult result = vkAcquireNextImageKHR(device, swapChain, UINT64_MAX, imageAvailableSemaphores_Left, VK_NULL_HANDLE, &imageIndex);
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cout << "vkAcquireNextImageKHR set imageAvailableSemaphores_Left ImageIndex:" << to_string(imageIndex) << endl;
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if (showDrawDebug) cout << "vkAcquireNextImageKHR set imageAvailableSemaphores_Left ImageIndex:" << to_string(imageIndex) << endl;
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if (result != VK_SUCCESS) {
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throw std::runtime_error("failed to acquire swap chain image!");
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@@ -508,15 +549,15 @@ void Application::drawLeft()
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{
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// 3. 检查该图像是否正在被之前的帧使用
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if (imagesInFlight_Left != VK_NULL_HANDLE) {
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cout << "vkWaitForFences imagesInFlight_Left ImageIndex:" << to_string(imageIndex) << endl;
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if (showDrawDebug) cout << "vkWaitForFences imagesInFlight_Left ImageIndex:" << to_string(imageIndex) << endl;
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vkWaitForFences(device, 1, &imagesInFlight_Left, VK_TRUE, UINT64_MAX);
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}
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else
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{
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cout << "imagesInFlight_Left is NULL" << endl;
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if (showDrawDebug) cout << "imagesInFlight_Left is NULL" << endl;
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}
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cout << "imagesInFlight_Left = inFlightFences_Left ImageIndex:" << to_string(imageIndex) << endl;
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if (showDrawDebug) cout << "imagesInFlight_Left = inFlightFences_Left ImageIndex:" << to_string(imageIndex) << endl;
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// 标记该图像正在被当前帧使用
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imagesInFlight_Left = inFlightFences_Left;
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}
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@@ -524,18 +565,18 @@ void Application::drawLeft()
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{
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// 3. 检查该图像是否正在被之前的帧使用
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if (imagesInFlight_Right != VK_NULL_HANDLE) {
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cout << "vkWaitForFences imagesInFlight_Right ImageIndex:" << to_string(imageIndex) << endl;
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if (showDrawDebug) cout << "vkWaitForFences imagesInFlight_Right ImageIndex:" << to_string(imageIndex) << endl;
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vkWaitForFences(device, 1, &imagesInFlight_Right, VK_TRUE, UINT64_MAX);
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}
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cout << "imagesInFlight_Right = inFlightFences_Left ImageIndex:" << to_string(imageIndex) << endl;
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if (showDrawDebug) cout << "imagesInFlight_Right = inFlightFences_Left ImageIndex:" << to_string(imageIndex) << endl;
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imagesInFlight_Right = inFlightFences_Left;
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}
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cout << "vkResetFences inFlightFences_Left" << endl;
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if (showDrawDebug) cout << "vkResetFences inFlightFences_Left" << endl;
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// 4. 重置栅栏
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vkResetFences(device, 1, &inFlightFences_Left);
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cout << "Process commandBuffers_Left" << endl;
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if (showDrawDebug) cout << "Process commandBuffers_Left" << endl;
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// 5. 记录命令缓冲区
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vkResetCommandBuffer(commandBuffers_Left, 0);
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recordCommandBuffer(commandBuffers_Left, imageIndex);
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@@ -556,21 +597,21 @@ void Application::drawLeft()
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VkSemaphore signalSemaphores[1];
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if (imageIndex == 0)
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{
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cout << "renderFinishedSemaphores_Left ImageIndex:" << to_string(imageIndex) << endl;
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if (showDrawDebug) cout << "renderFinishedSemaphores_Left ImageIndex:" << to_string(imageIndex) << endl;
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// 使用对应图像的渲染完成信号量
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signalSemaphores[0] = { renderFinishedSemaphores_Left };
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}
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else
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{
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cout << "renderFinishedSemaphores_Right ImageIndex:" << to_string(imageIndex) << endl;
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if (showDrawDebug) cout << "renderFinishedSemaphores_Right ImageIndex:" << to_string(imageIndex) << endl;
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// 使用对应图像的渲染完成信号量
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signalSemaphores[0] = { renderFinishedSemaphores_Right };
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}
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submitInfo.signalSemaphoreCount = 1;
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submitInfo.pSignalSemaphores = signalSemaphores;
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cout << "vkQueueSubmit inFlightFences_Left" << endl;
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if (showDrawDebug) cout << "vkQueueSubmit inFlightFences_Left" << endl;
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if (vkQueueSubmit(graphicsQueue, 1, &submitInfo, inFlightFences_Left) != VK_SUCCESS) {
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throw std::runtime_error("failed to submit draw command buffer!");
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}
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@@ -586,7 +627,7 @@ void Application::drawLeft()
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presentInfo.pSwapchains = swapChains;
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presentInfo.pImageIndices = &imageIndex;
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cout << "Present Left \n" << endl;
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if (showDrawDebug) cout << "Present Left \n" << endl;
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result = vkQueuePresentKHR(presentQueue, &presentInfo);
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if (result != VK_SUCCESS) {
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@@ -597,17 +638,17 @@ void Application::drawLeft()
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void Application::drawRight()
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{
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cout << "call drawRight curFrame:" << to_string(currentFrame) << endl;
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if (showDrawDebug) cout << "call drawRight curFrame:" << to_string(currentFrame) << endl;
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// 1. 等待前一帧完成
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vkWaitForFences(device, 1, &inFlightFences_Right, VK_TRUE, UINT64_MAX);
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cout << "vkWaitForFences inFlightFences_Right" << endl;
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if (showDrawDebug) cout << "vkWaitForFences inFlightFences_Right" << endl;
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// 2. 获取交换链图像 - 使用当前帧的信号量
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uint32_t imageIndex;
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VkResult result = vkAcquireNextImageKHR(device, swapChain, UINT64_MAX, imageAvailableSemaphores_Right, VK_NULL_HANDLE, &imageIndex);
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cout << "vkAcquireNextImageKHR set imageAvailableSemaphores_Right ImageIndex:" << to_string(imageIndex) << endl;
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if (showDrawDebug) cout << "vkAcquireNextImageKHR set imageAvailableSemaphores_Right ImageIndex:" << to_string(imageIndex) << endl;
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if (result != VK_SUCCESS) {
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throw std::runtime_error("failed to acquire swap chain image!");
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@@ -617,10 +658,10 @@ void Application::drawRight()
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{
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// 3. 检查该图像是否正在被之前的帧使用
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if (imagesInFlight_Left != VK_NULL_HANDLE) {
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cout << "vkWaitForFences imagesInFlight_Left ImageIndex:0" << endl;
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if (showDrawDebug) cout << "vkWaitForFences imagesInFlight_Left ImageIndex:0" << endl;
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vkWaitForFences(device, 1, &imagesInFlight_Left, VK_TRUE, UINT64_MAX);
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}
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cout << "imagesInFlight_Left = inFlightFences_Right ImageIndex:0" << endl;
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if (showDrawDebug) cout << "imagesInFlight_Left = inFlightFences_Right ImageIndex:0" << endl;
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// 标记该图像正在被当前帧使用
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imagesInFlight_Left = inFlightFences_Right;
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}
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@@ -628,21 +669,21 @@ void Application::drawRight()
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{
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// 3. 检查该图像是否正在被之前的帧使用
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if (imagesInFlight_Right != VK_NULL_HANDLE) {
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cout << "vkWaitForFences imagesInFlight_Right ImageIndex:1" << endl;
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if (showDrawDebug) cout << "vkWaitForFences imagesInFlight_Right ImageIndex:1" << endl;
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vkWaitForFences(device, 1, &imagesInFlight_Right, VK_TRUE, UINT64_MAX);
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}
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else {
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cout << "imagesInFlight_Right is NULL" << endl;
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if (showDrawDebug) cout << "imagesInFlight_Right is NULL" << endl;
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}
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cout << "imagesInFlight_Right = inFlightFences_Right ImageIndex:1" << endl;
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if (showDrawDebug) cout << "imagesInFlight_Right = inFlightFences_Right ImageIndex:1" << endl;
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imagesInFlight_Right = inFlightFences_Right;
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}
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cout << "vkResetFences inFlightFences_Right" << endl;
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if (showDrawDebug) cout << "vkResetFences inFlightFences_Right" << endl;
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// 4. 重置栅栏
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vkResetFences(device, 1, &inFlightFences_Right);
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cout << "Process commandBuffers_Right" << endl;
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if (showDrawDebug) cout << "Process commandBuffers_Right" << endl;
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// 5. 记录命令缓冲区
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vkResetCommandBuffer(commandBuffers_Right, 0);
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recordCommandBuffer(commandBuffers_Right, imageIndex);
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@@ -663,21 +704,21 @@ void Application::drawRight()
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VkSemaphore signalSemaphores[1];
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if (imageIndex == 0)
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{
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cout << "renderFinishedSemaphores_Left ImageIndex:0" << endl;
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if (showDrawDebug) cout << "renderFinishedSemaphores_Left ImageIndex:0" << endl;
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// 使用对应图像的渲染完成信号量
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signalSemaphores[0] = { renderFinishedSemaphores_Left };
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}
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else
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{
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cout << "renderFinishedSemaphores_Right ImageIndex:1" << endl;
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if (showDrawDebug) cout << "renderFinishedSemaphores_Right ImageIndex:1" << endl;
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// 使用对应图像的渲染完成信号量
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signalSemaphores[0] = { renderFinishedSemaphores_Right };
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}
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submitInfo.signalSemaphoreCount = 1;
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submitInfo.pSignalSemaphores = signalSemaphores;
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cout << "vkQueueSubmit inFlightFences_Right" << endl;
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if (showDrawDebug) cout << "vkQueueSubmit inFlightFences_Right" << endl;
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if (vkQueueSubmit(graphicsQueue, 1, &submitInfo, inFlightFences_Right) != VK_SUCCESS) {
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throw std::runtime_error("failed to submit draw command buffer!");
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}
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@@ -693,7 +734,7 @@ void Application::drawRight()
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presentInfo.pSwapchains = swapChains;
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presentInfo.pImageIndices = &imageIndex;
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cout << "Present Right \n" << endl;
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if (showDrawDebug) cout << "Present Right \n" << endl;
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result = vkQueuePresentKHR(presentQueue, &presentInfo);
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if (result != VK_SUCCESS) {
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@@ -721,6 +762,77 @@ void DestroyDebugUtilsMessengerEXT(VkInstance instance, VkDebugUtilsMessengerEXT
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}
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}
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void Application::createColorResources() {
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VkFormat colorFormat = swapChainImageFormat;
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VkImageCreateInfo imageInfo{};
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imageInfo.sType = VK_STRUCTURE_TYPE_IMAGE_CREATE_INFO;
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imageInfo.imageType = VK_IMAGE_TYPE_2D;
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imageInfo.format = colorFormat;
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imageInfo.extent.width = swapChainExtent.width;
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imageInfo.extent.height = swapChainExtent.height;
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imageInfo.extent.depth = 1;
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imageInfo.mipLevels = 1;
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imageInfo.arrayLayers = 1;
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imageInfo.samples = VK_SAMPLE_COUNT_8_BIT; // ←←← 8x MSAA
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imageInfo.tiling = VK_IMAGE_TILING_OPTIMAL;
|
||||
imageInfo.usage = VK_IMAGE_USAGE_TRANSIENT_ATTACHMENT_BIT | VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT;
|
||||
imageInfo.sharingMode = VK_SHARING_MODE_EXCLUSIVE;
|
||||
|
||||
if (vkCreateImage(device, &imageInfo, nullptr, &colorImage) != VK_SUCCESS) {
|
||||
throw std::runtime_error("failed to create MSAA color image!");
|
||||
}
|
||||
|
||||
VkMemoryRequirements memRequirements;
|
||||
vkGetImageMemoryRequirements(device, colorImage, &memRequirements);
|
||||
|
||||
VkMemoryAllocateInfo allocInfo{};
|
||||
allocInfo.sType = VK_STRUCTURE_TYPE_MEMORY_ALLOCATE_INFO;
|
||||
allocInfo.allocationSize = memRequirements.size;
|
||||
allocInfo.memoryTypeIndex = findMemoryType(physicalDevice, memRequirements.memoryTypeBits, VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT);
|
||||
|
||||
if (vkAllocateMemory(device, &allocInfo, nullptr, &colorImageMemory) != VK_SUCCESS) {
|
||||
throw std::runtime_error("failed to allocate MSAA color image memory!");
|
||||
}
|
||||
|
||||
vkBindImageMemory(device, colorImage, colorImageMemory, 0);
|
||||
|
||||
// 创建 ImageView
|
||||
VkImageViewCreateInfo viewInfo{};
|
||||
viewInfo.sType = VK_STRUCTURE_TYPE_IMAGE_VIEW_CREATE_INFO;
|
||||
viewInfo.image = colorImage;
|
||||
viewInfo.viewType = VK_IMAGE_VIEW_TYPE_2D;
|
||||
viewInfo.format = colorFormat;
|
||||
viewInfo.subresourceRange.aspectMask = VK_IMAGE_ASPECT_COLOR_BIT;
|
||||
viewInfo.subresourceRange.baseMipLevel = 0;
|
||||
viewInfo.subresourceRange.levelCount = 1;
|
||||
viewInfo.subresourceRange.baseArrayLayer = 0;
|
||||
viewInfo.subresourceRange.layerCount = 1;
|
||||
|
||||
if (vkCreateImageView(device, &viewInfo, nullptr, &colorImageView) != VK_SUCCESS) {
|
||||
throw std::runtime_error("failed to create MSAA color image view!");
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
uint32_t Application::findMemoryType(VkPhysicalDevice physicalDevice, uint32_t typeFilter,
|
||||
VkMemoryPropertyFlags properties)
|
||||
{
|
||||
VkPhysicalDeviceMemoryProperties memProperties;
|
||||
vkGetPhysicalDeviceMemoryProperties(physicalDevice, &memProperties);
|
||||
|
||||
for (uint32_t i = 0; i < memProperties.memoryTypeCount; i++)
|
||||
{
|
||||
if ((typeFilter & (1 << i)) &&
|
||||
(memProperties.memoryTypes[i].propertyFlags & properties) == properties)
|
||||
{
|
||||
return i;
|
||||
}
|
||||
}
|
||||
|
||||
throw std::runtime_error("Failed to find suitable memory type!");
|
||||
}
|
||||
|
||||
void Application::cleanup() {
|
||||
if (enableValidationLayers) {
|
||||
DestroyDebugUtilsMessengerEXT(instance, debugMessenger, nullptr);
|
||||
@@ -758,6 +870,10 @@ void Application::cleanup() {
|
||||
vkDestroyImageView(device, imageView, nullptr);
|
||||
}
|
||||
|
||||
vkDestroyImageView(device, colorImageView, nullptr);
|
||||
vkDestroyImage(device, colorImage, nullptr);
|
||||
vkFreeMemory(device, colorImageMemory, nullptr);
|
||||
|
||||
// 销毁交换链
|
||||
vkDestroySwapchainKHR(device, swapChain, nullptr);
|
||||
|
||||
@@ -773,6 +889,7 @@ void Application::cleanup() {
|
||||
// 销毁 Vulkan 实例
|
||||
vkDestroyInstance(instance, nullptr);
|
||||
|
||||
|
||||
#ifdef _WIN32
|
||||
// 销毁 GLFW 窗口
|
||||
glfwDestroyWindow(window);
|
||||
|
||||
@@ -17,6 +17,7 @@ public:
|
||||
void mainLoop();
|
||||
void cleanup();
|
||||
|
||||
void createImages();
|
||||
void createImageViews();
|
||||
void createFramebuffers();
|
||||
void createCommandPool();
|
||||
@@ -65,6 +66,17 @@ private:
|
||||
VkFence imagesInFlight_Left = VK_NULL_HANDLE;
|
||||
VkFence imagesInFlight_Right = VK_NULL_HANDLE;
|
||||
|
||||
const bool showDrawDebug = false;
|
||||
|
||||
int currentFrame = 0;
|
||||
bool inited = false;
|
||||
|
||||
//MSAA
|
||||
VkImage colorImage;
|
||||
VkDeviceMemory colorImageMemory;
|
||||
VkImageView colorImageView;
|
||||
void createColorResources();
|
||||
uint32_t findMemoryType(VkPhysicalDevice physicalDevice, uint32_t typeFilter,
|
||||
VkMemoryPropertyFlags properties);
|
||||
|
||||
};
|
||||
Reference in New Issue
Block a user