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先叨叨

到上篇为止已经创建了FrameBuffer和RenderPass。建立Pipeline的先决条件已经具备。本篇就来创建Pipeline。

Git信息

• repository: https://gitee.com/J8_series/easy-car-ui
• tag: 10-CreatePipeline
• url: https://gitee.com/J8_series/easy-car-ui/tree/10-CreatePipeline

关键代码

TestPipeline::Initialize()

本方法很长，对照【Vulkan入门】06-Pipeline介绍看会清晰一点。

1. 通过shaderStages为Pipeline指定Shader程序
2. VIEWPORT决定了Vulkan渲染图片的大小，SCISSOR决定了Vulkan渲染后对图片的裁剪。我们希望这两个值随窗口大小改变而改变，因此我们用dynamicStates告诉Vulkan这两个值在渲染时动态指定。
3. 通过vertexInputInfo给Pipeline提供顶点信息，但目前我们还不需要任何顶点信息。
4. 通过inputAssembly告诉Pipeline我们的顶点是想画什么，例子中我们需要Pipeline画三角形
5. 通过rasterizer告诉Pipeline如何光栅化
6. 通过multisampling告诉Pipeline如何采样
7. 通过colorBlending告诉Pipeline如何叠加同一个像素的多个颜色
8. 通过pipelineLayoutInfo告诉Pipeline全局变量，目前我们不需要任何全局变量

void TestPipeline::Initialize(const std::string& vertexShaderFile,const std::string& fragmentShaderFile,const VkDevice& device,uint32_t width,uint32_t height,uint32_t memroyTypeIndex){m_vertexShaderFile = vertexShaderFile;m_fragmentShaderFile = fragmentShaderFile;m_device = device;m_width = width;m_height = height;m_memroyTypeIndex = memroyTypeIndex;CreateRenderPass();CreateFramebuffers();std::vector<char> vertShaderCode = ReadShader(m_vertexShaderFile);std::vector<char> fragShaderCode = ReadShader(m_fragmentShaderFile);VkShaderModule vertShaderModule = CreateShaderModule(vertShaderCode);VkShaderModule fragShaderModule = CreateShaderModule(fragShaderCode);//https://registry.khronos.org/vulkan/specs/latest/html/vkspec.html#VkPipelineShaderStageCreateInfoVkPipelineShaderStageCreateInfo vertShaderStageInfo{};vertShaderStageInfo.sType = VK_STRUCTURE_TYPE_PIPELINE_SHADER_STAGE_CREATE_INFO;vertShaderStageInfo.stage = VK_SHADER_STAGE_VERTEX_BIT;vertShaderStageInfo.module = vertShaderModule;vertShaderStageInfo.pName = "main";VkPipelineShaderStageCreateInfo fragShaderStageInfo{};fragShaderStageInfo.sType = VK_STRUCTURE_TYPE_PIPELINE_SHADER_STAGE_CREATE_INFO;fragShaderStageInfo.stage = VK_SHADER_STAGE_FRAGMENT_BIT;fragShaderStageInfo.module = fragShaderModule;fragShaderStageInfo.pName = "main";VkPipelineShaderStageCreateInfo shaderStages[] = {vertShaderStageInfo, fragShaderStageInfo};std::vector<VkDynamicState> dynamicStates = {VK_DYNAMIC_STATE_VIEWPORT,VK_DYNAMIC_STATE_SCISSOR};//https://registry.khronos.org/vulkan/specs/latest/html/vkspec.html#VkPipelineDynamicStateCreateInfoVkPipelineDynamicStateCreateInfo dynamicState{};dynamicState.sType = VK_STRUCTURE_TYPE_PIPELINE_DYNAMIC_STATE_CREATE_INFO;dynamicState.dynamicStateCount = static_cast<uint32_t>(dynamicStates.size());dynamicState.pDynamicStates = dynamicStates.data();//https://registry.khronos.org/vulkan/specs/latest/html/vkspec.html#VkPipelineVertexInputStateCreateInfoVkPipelineVertexInputStateCreateInfo vertexInputInfo{};vertexInputInfo.sType = VK_STRUCTURE_TYPE_PIPELINE_VERTEX_INPUT_STATE_CREATE_INFO;vertexInputInfo.vertexBindingDescriptionCount = 0;vertexInputInfo.vertexAttributeDescriptionCount = 0;//https://registry.khronos.org/vulkan/specs/latest/html/vkspec.html#VkPipelineInputAssemblyStateCreateInfoVkPipelineInputAssemblyStateCreateInfo inputAssembly{};inputAssembly.sType = VK_STRUCTURE_TYPE_PIPELINE_INPUT_ASSEMBLY_STATE_CREATE_INFO;inputAssembly.topology = VK_PRIMITIVE_TOPOLOGY_TRIANGLE_LIST;inputAssembly.primitiveRestartEnable = VK_FALSE;//https://registry.khronos.org/vulkan/specs/latest/html/vkspec.html#VkPipelineViewportStateCreateInfoVkPipelineViewportStateCreateInfo viewportState{};viewportState.sType = VK_STRUCTURE_TYPE_PIPELINE_VIEWPORT_STATE_CREATE_INFO;viewportState.viewportCount = 1;viewportState.scissorCount = 1;//https://registry.khronos.org/vulkan/specs/latest/html/vkspec.html#VkPipelineRasterizationStateCreateInfoVkPipelineRasterizationStateCreateInfo rasterizer{};rasterizer.sType = VK_STRUCTURE_TYPE_PIPELINE_RASTERIZATION_STATE_CREATE_INFO;rasterizer.depthClampEnable = VK_FALSE;rasterizer.rasterizerDiscardEnable = VK_FALSE;rasterizer.polygonMode = VK_POLYGON_MODE_FILL;rasterizer.lineWidth = 1.0f;rasterizer.cullMode = VK_CULL_MODE_BACK_BIT;rasterizer.frontFace = VK_FRONT_FACE_CLOCKWISE;rasterizer.depthBiasEnable = VK_FALSE;//https://registry.khronos.org/vulkan/specs/latest/html/vkspec.html#VkPipelineMultisampleStateCreateInfoVkPipelineMultisampleStateCreateInfo multisampling{};multisampling.sType = VK_STRUCTURE_TYPE_PIPELINE_MULTISAMPLE_STATE_CREATE_INFO;multisampling.sampleShadingEnable = VK_FALSE;multisampling.rasterizationSamples = VK_SAMPLE_COUNT_1_BIT;//https://registry.khronos.org/vulkan/specs/latest/html/vkspec.html#VkPipelineColorBlendAttachmentStateVkPipelineColorBlendAttachmentState colorBlendAttachment{};colorBlendAttachment.colorWriteMask = VK_COLOR_COMPONENT_R_BIT | VK_COLOR_COMPONENT_G_BIT | VK_COLOR_COMPONENT_B_BIT | VK_COLOR_COMPONENT_A_BIT;colorBlendAttachment.blendEnable = VK_FALSE;//https://registry.khronos.org/vulkan/specs/latest/html/vkspec.html#VkPipelineColorBlendStateCreateInfoVkPipelineColorBlendStateCreateInfo colorBlending{};colorBlending.sType = VK_STRUCTURE_TYPE_PIPELINE_COLOR_BLEND_STATE_CREATE_INFO;colorBlending.logicOpEnable = VK_FALSE;colorBlending.logicOp = VK_LOGIC_OP_COPY;colorBlending.attachmentCount = 1;colorBlending.pAttachments = &colorBlendAttachment;colorBlending.blendConstants[0] = 0.0f;colorBlending.blendConstants[1] = 0.0f;colorBlending.blendConstants[2] = 0.0f;colorBlending.blendConstants[3] = 0.0f;//https://registry.khronos.org/vulkan/specs/latest/html/vkspec.html#VkPipelineLayoutCreateInfoVkPipelineLayoutCreateInfo pipelineLayoutInfo{};pipelineLayoutInfo.sType = VK_STRUCTURE_TYPE_PIPELINE_LAYOUT_CREATE_INFO;pipelineLayoutInfo.setLayoutCount = 0;pipelineLayoutInfo.pushConstantRangeCount = 0;if (vkCreatePipelineLayout(m_device, &pipelineLayoutInfo, nullptr, &m_pipelineLayout) != VK_SUCCESS){throw std::runtime_error("To create pipeline layout is failed");}VkGraphicsPipelineCreateInfo pipelineInfo{};pipelineInfo.sType = VK_STRUCTURE_TYPE_GRAPHICS_PIPELINE_CREATE_INFO;pipelineInfo.stageCount = 2;pipelineInfo.pStages = shaderStages;pipelineInfo.pVertexInputState = &vertexInputInfo;pipelineInfo.pInputAssemblyState = &inputAssembly;pipelineInfo.pViewportState = &viewportState;pipelineInfo.pRasterizationState = &rasterizer;pipelineInfo.pMultisampleState = &multisampling;pipelineInfo.pColorBlendState = &colorBlending;pipelineInfo.pDynamicState = &dynamicState;pipelineInfo.layout = m_pipelineLayout;pipelineInfo.renderPass = m_renderPass;pipelineInfo.subpass = 0;pipelineInfo.basePipelineHandle = VK_NULL_HANDLE;if (vkCreateGraphicsPipelines(m_device, VK_NULL_HANDLE, 1, &pipelineInfo, nullptr, &m_graphicsPipeline) != VK_SUCCESS) {throw std::runtime_error("To create graphics pipeline is failed!");}vkDestroyShaderModule(m_device, fragShaderModule, nullptr);vkDestroyShaderModule(m_device, vertShaderModule, nullptr);}

编译运行

没有出现错误就是最好的现象