FInished graphics pipeline basics

.envrc

@@ -1 +1,2 @@
+PATH_add ./src/shaders
 use_flake

flake.nix

@@ -42,6 +42,7 @@
           fmt
           glfw
           glm
+          shaderc
           vulkan-extension-layer
           vulkan-memory-allocator
           vulkan-utility-libraries

src/main.cpp

@@ -1,4 +1,5 @@
 #include <fmt/format.h>
+#include <fstream>
 #include <iostream>
 #include <set>
 
@@ -61,6 +62,10 @@ class VulkanApp {
   vk::Extent2D                     mSwapChainExtent;
   std::vector<vk::UniqueImageView> mSwapChainImageViews;
 
+  vk::UniqueRenderPass     mRenderPass;
+  vk::UniquePipelineLayout mPipelineLayout;
+  vk::UniquePipeline       mGraphicsPipeline;
+
   struct QueueFamilyIndices {
     std::optional<u32> graphics_family;
     std::optional<u32> present_family;
@@ -74,6 +79,23 @@ class VulkanApp {
     std::vector<vk::PresentModeKHR>   present_modes;
   };
 
+  static fn readFile(const std::string& filename) -> std::vector<char> {
+    std::ifstream file(filename, std::ios::ate | std::ios::binary);
+
+    if (!file.is_open())
+      throw std::runtime_error("Failed to open file! " + filename);
+
+    usize             fileSize = static_cast<usize>(file.tellg());
+    std::vector<char> buffer(fileSize);
+
+    file.seekg(0);
+    file.read(buffer.data(), static_cast<std::streamsize>(fileSize));
+
+    file.close();
+
+    return buffer;
+  }
+
   fn initWindow() -> void {
     mGLFWInstance = vkfw::initUnique();
 
@@ -93,6 +115,8 @@ class VulkanApp {
     createLogicalDevice();
     createSwapChain();
     createImageViews();
+    createRenderPass();
+    createGraphicsPipeline();
   }
 
   fn mainLoop() -> void {
@@ -254,7 +278,7 @@ class VulkanApp {
       .preTransform   = swapChainSupport.capabilities.currentTransform,
       .compositeAlpha = vk::CompositeAlphaFlagBitsKHR::eOpaque,
       .presentMode    = presentMode,
-      .clipped        = VK_TRUE,
+      .clipped        = vk::True,
       .oldSwapchain   = nullptr,
     };
 
@@ -288,6 +312,145 @@ class VulkanApp {
     }
   }
 
+  fn createRenderPass() -> void {
+    vk::AttachmentDescription colorAttachment {
+      .format         = mSwapChainImageFormat,
+      .samples        = vk::SampleCountFlagBits::e1,
+      .loadOp         = vk::AttachmentLoadOp::eClear,
+      .storeOp        = vk::AttachmentStoreOp::eStore,
+      .stencilLoadOp  = vk::AttachmentLoadOp::eDontCare,
+      .stencilStoreOp = vk::AttachmentStoreOp::eDontCare,
+      .initialLayout  = vk::ImageLayout::eUndefined,
+      .finalLayout    = vk::ImageLayout::ePresentSrcKHR,
+    };
+
+    vk::AttachmentReference colorAttachmentRef {
+      .attachment = 0,
+      .layout     = vk::ImageLayout::eColorAttachmentOptimal,
+    };
+
+    vk::SubpassDescription subpass {
+      .pipelineBindPoint    = vk::PipelineBindPoint::eGraphics,
+      .colorAttachmentCount = 1,
+      .pColorAttachments    = &colorAttachmentRef,
+    };
+
+    vk::RenderPassCreateInfo renderPassInfo {
+      .attachmentCount = 1,
+      .pAttachments    = &colorAttachment,
+      .subpassCount    = 1,
+      .pSubpasses      = &subpass,
+    };
+
+    mRenderPass = mDevice->createRenderPassUnique(renderPassInfo);
+  }
+
+  fn createGraphicsPipeline() -> void {
+    std::vector<char> vertShaderCode = readFile("src/shaders/vert.spv");
+    std::vector<char> fragShaderCode = readFile("src/shaders/frag.spv");
+
+    vk::UniqueShaderModule vertShaderModule = createShaderModule(vertShaderCode);
+    vk::UniqueShaderModule fragShaderModule = createShaderModule(fragShaderCode);
+
+    vk::PipelineShaderStageCreateInfo vertShaderStageInfo {
+      .stage  = vk::ShaderStageFlagBits::eVertex,
+      .module = vertShaderModule.get(),
+      .pName  = "main",
+    };
+
+    vk::PipelineShaderStageCreateInfo fragShaderStageInfo {
+      .stage  = vk::ShaderStageFlagBits::eFragment,
+      .module = fragShaderModule.get(),
+      .pName  = "main",
+    };
+
+    std::array<vk::PipelineShaderStageCreateInfo, 2> shaderStages = { vertShaderStageInfo,
+                                                                      fragShaderStageInfo };
+
+    vk::PipelineVertexInputStateCreateInfo vertexInputInfo {
+      .vertexBindingDescriptionCount   = 0,
+      .pVertexBindingDescriptions      = nullptr,
+      .vertexAttributeDescriptionCount = 0,
+      .pVertexAttributeDescriptions    = nullptr,
+    };
+
+    vk::PipelineInputAssemblyStateCreateInfo inputAssembly {
+      .topology               = vk::PrimitiveTopology::eTriangleList,
+      .primitiveRestartEnable = vk::False,
+    };
+
+    vk::PipelineViewportStateCreateInfo viewportState {
+      .viewportCount = 1,
+      .scissorCount  = 1,
+    };
+
+    vk::PipelineRasterizationStateCreateInfo rasterizer {
+      .depthClampEnable        = vk::False,
+      .rasterizerDiscardEnable = vk::False,
+      .polygonMode             = vk::PolygonMode::eFill,
+      .cullMode                = vk::CullModeFlagBits::eBack,
+      .frontFace               = vk::FrontFace::eClockwise,
+      .depthBiasEnable         = vk::False,
+      .lineWidth               = 1.0F,
+    };
+
+    vk::PipelineMultisampleStateCreateInfo multisampling {
+      .rasterizationSamples = vk::SampleCountFlagBits::e1,
+      .sampleShadingEnable  = vk::False,
+    };
+
+    vk::PipelineColorBlendAttachmentState colorBlendAttachment {
+      .blendEnable    = vk::False,
+      .colorWriteMask = vk::ColorComponentFlagBits::eR | vk::ColorComponentFlagBits::eG |
+                        vk::ColorComponentFlagBits::eB | vk::ColorComponentFlagBits::eA,
+    };
+
+    vk::PipelineColorBlendStateCreateInfo colorBlending {
+      .logicOpEnable   = vk::False,
+      .logicOp         = vk::LogicOp::eCopy,
+      .attachmentCount = 1,
+      .pAttachments    = &colorBlendAttachment,
+      .blendConstants  = std::array<float, 4> { 0.0F, 0.0F, 0.0F, 0.0F },
+    };
+    std::vector<vk::DynamicState> dynamicStates = { vk::DynamicState::eViewport, vk::DynamicState::eScissor };
+
+    vk::PipelineDynamicStateCreateInfo dynamicState {
+      .dynamicStateCount = static_cast<u32>(dynamicStates.size()),
+      .pDynamicStates    = dynamicStates.data(),
+    };
+
+    vk::PipelineLayoutCreateInfo pipelineLayoutInfo {
+      .setLayoutCount         = 0,
+      .pushConstantRangeCount = 0,
+    };
+
+    mPipelineLayout = mDevice->createPipelineLayoutUnique(pipelineLayoutInfo);
+
+    vk::GraphicsPipelineCreateInfo pipelineInfo {
+      .stageCount          = static_cast<u32>(shaderStages.size()),
+      .pStages             = shaderStages.data(),
+      .pVertexInputState   = &vertexInputInfo,
+      .pInputAssemblyState = &inputAssembly,
+      .pViewportState      = &viewportState,
+      .pRasterizationState = &rasterizer,
+      .pMultisampleState   = &multisampling,
+      .pColorBlendState    = &colorBlending,
+      .pDynamicState       = &dynamicState,
+      .layout              = mPipelineLayout.get(),
+      .renderPass          = mRenderPass.get(),
+      .subpass             = 0,
+    };
+
+    mGraphicsPipeline = mDevice->createGraphicsPipelineUnique(nullptr, pipelineInfo).value;
+  }
+
+  fn createShaderModule(const std::vector<char>& code) -> vk::UniqueShaderModule {
+    vk::ShaderModuleCreateInfo createInfo { .codeSize = code.size(),
+                                            .pCode    = std::bit_cast<const u32*>(code.data()) };
+
+    return mDevice->createShaderModuleUnique(createInfo);
+  }
+
   static fn chooseSwapSurfaceFormat(const std::vector<vk::SurfaceFormatKHR>& availableFormats
   ) -> vk::SurfaceFormatKHR {
     for (const auto& availableFormat : availableFormats)

src/shaders/shader.frag

@@ -0,0 +1,9 @@
+#version 450
+
+layout(location = 0) in vec3 fragColor;
+
+layout(location = 0) out vec4 outColor;
+
+void main() {
+    outColor = vec4(fragColor, 1.0);
+}

src/shaders/shader.vert

@@ -0,0 +1,20 @@
+#version 450
+
+layout(location = 0) out vec3 fragColor;
+
+vec2 positions[3] = vec2[](
+    vec2(0.0, -0.5),
+    vec2(0.5, 0.5),
+    vec2(-0.5, 0.5)
+);
+
+vec3 colors[3] = vec3[](
+    vec3(1.0, 0.0, 0.0),
+    vec3(0.0, 1.0, 0.0),
+    vec3(0.0, 0.0, 1.0)
+);
+
+void main() {
+    gl_Position = vec4(positions[gl_VertexIndex], 0.0, 1.0);
+    fragColor = colors[gl_VertexIndex];
+}

src/shaders/shaderc

@@ -0,0 +1,7 @@
+#!/usr/bin/env sh
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+cd "$SCRIPT_DIR" || exit
+
+glslc -c ./shader.vert -o ./vert.spv
+glslc -c ./shader.frag -o ./frag.spv