Triangle finally renderedgit add . Swap ChainRecreation is up next, to allow for resizing. Then, it will be on to buffers for non-hardcoded shaders

src/devicelibrary.cpp

@@ -19,14 +19,12 @@ namespace DeviceControl {
   VkPhysicalDeviceFeatures deviceFeatures;
 
 
-  VkSwapchainKHR swapChain;
   std::vector<VkImage> swapChainImages;
   VkFormat swapChainImageFormat;
   VkExtent2D swapChainExtent;
   std::vector<VkImageView> swapChainImageViews;
 
-  VkQueue graphicsQueue;
+
-  VkQueue presentQueue;
   
   struct SwapChainSupportDetails {
     VkSurfaceCapabilitiesKHR capabilities;
@@ -227,8 +225,8 @@ namespace DeviceControl {
     }
     if(Global::enableValidationLayers) std::cout << "Created Logical device successfully!\n" << std::endl;
 
-    vkGetDeviceQueue(Global::device, indices.graphicsFamily.value(), 0, &graphicsQueue);  
+    vkGetDeviceQueue(Global::device, indices.graphicsFamily.value(), 0, &Global::graphicsQueue);  
-    vkGetDeviceQueue(Global::device, indices.presentFamily.value(), 0, &presentQueue);
+    vkGetDeviceQueue(Global::device, indices.presentFamily.value(), 0, &Global::presentQueue);
   }
   void devicelibrary::createSwapChain(GLFWwindow* window) {
     SwapChainSupportDetails swapChainSupport = querySwapChainSupport(Global::physicalDevice);
@@ -284,20 +282,20 @@ namespace DeviceControl {
     // require you to recreate it and reference the old one specified here, will revisit in a few days.
     createSwapChainInfo.oldSwapchain = VK_NULL_HANDLE;
 
-    if(vkCreateSwapchainKHR(Global::device, &createSwapChainInfo, nullptr, &swapChain) != VK_SUCCESS) {
+    if(vkCreateSwapchainKHR(Global::device, &createSwapChainInfo, nullptr, &Global::swapChain) != VK_SUCCESS) {
       throw std::runtime_error("Failed to create the swap chain!!");
     }
     if(Global::enableValidationLayers) std::cout << "Swap Chain created successfully\n" << std::endl;
 
-    vkGetSwapchainImagesKHR(Global::device, swapChain, &imageCount, nullptr);
+    vkGetSwapchainImagesKHR(Global::device, Global::swapChain, &imageCount, nullptr);
     swapChainImages.resize(imageCount);
-    vkGetSwapchainImagesKHR(Global::device, swapChain, &imageCount, swapChainImages.data());
+    vkGetSwapchainImagesKHR(Global::device, Global::swapChain, &imageCount, swapChainImages.data());
 
     swapChainImageFormat = surfaceFormat.format;
     swapChainExtent = extent;
   }
   void devicelibrary::destroySwapChain() {
-    vkDestroySwapchainKHR(Global::device, swapChain, nullptr);
+    vkDestroySwapchainKHR(Global::device, Global::swapChain, nullptr);
     if(Global::enableValidationLayers) std::cout << "Destroyed Swap Chain safely\n" << std::endl;   
   }
   void devicelibrary::createImageViews() {

src/devicelibrary.h

@@ -14,6 +14,7 @@ class devicelibrary {
       void destroyImageViews();
       void createCommandPool();
       void destroyCommandPool();
+
       // ---------- Getters & Setters ----------- //
       VkFormat getImageFormat();
       std::vector<VkImageView> getSwapChainImageViews();

src/global.cpp

@@ -14,7 +14,11 @@ namespace Global {
   VkSurfaceKHR surface = VK_NULL_HANDLE;
   VkDevice device = VK_NULL_HANDLE;
   VkPhysicalDevice physicalDevice = VK_NULL_HANDLE;
-
+  VkSwapchainKHR swapChain = VK_NULL_HANDLE;
+  VkCommandPool commandPool = VK_NULL_HANDLE;
+  std::vector<VkCommandBuffer> commandBuffers;
+  VkQueue graphicsQueue = VK_NULL_HANDLE;
+  VkQueue presentQueue = VK_NULL_HANDLE;
   Global::QueueFamilyIndices findQueueFamilies(VkPhysicalDevice device) {
     // First we feed in a integer we want to use to hold the number of queued items, that fills it, then we create that amount of default constructed *VkQueueFamilyProperties* structs. 
     // These store the flags, the amount of queued items in the family, and timestamp data. Queue families are simply group collections of tasks we want to get done. 

src/global.h

@@ -14,6 +14,11 @@ namespace Global {
   extern const std::vector<const char*> validationLayers;
   extern const bool enableValidationLayers;
   extern VkDevice device;  
+  extern VkCommandPool commandPool;
+  extern std::vector<VkCommandBuffer> commandBuffers;  
+  extern VkQueue graphicsQueue;
+  extern VkQueue presentQueue;
+  const int MAX_FRAMES_IN_FLIGHT = 2;
   struct QueueFamilyIndices {
     // We need to check that the Queue families support graphics operations and window presentation, sometimes they can support one or the other,
     // therefore, we take into account both for completion.
@@ -24,7 +29,7 @@ namespace Global {
       return graphicsFamily.has_value() && presentFamily.has_value();
     }
   };
-
+  extern VkSwapchainKHR swapChain;
   extern VkSurfaceKHR surface;
   extern VkPhysicalDevice physicalDevice;
   Global::QueueFamilyIndices findQueueFamilies(VkPhysicalDevice device);

src/graphics/graphicspipeline.cpp

@@ -11,8 +11,6 @@ namespace Graphics {
   };
   std::vector<VkFramebuffer> swapChainFramebuffers;
 
-  VkCommandPool commandPool;
-  VkCommandBuffer commandBuffer;
 
   VkRenderPass renderPass;
   VkPipelineLayout pipelineLayout;
@@ -242,6 +240,7 @@ namespace Graphics {
   }
 
   void graphicspipeline::createCommandPool() {
+
     Global::QueueFamilyIndices queueFamilyIndices = Global::findQueueFamilies(Global::physicalDevice);
 
     VkCommandPoolCreateInfo poolInfo{};
@@ -249,28 +248,30 @@ namespace Graphics {
     poolInfo.flags = VK_COMMAND_POOL_CREATE_RESET_COMMAND_BUFFER_BIT;
     poolInfo.queueFamilyIndex = queueFamilyIndices.graphicsFamily.value();
     
-    if(vkCreateCommandPool(Global::device, &poolInfo, nullptr, &commandPool) != VK_SUCCESS) {
+    if(vkCreateCommandPool(Global::device, &poolInfo, nullptr, &Global::commandPool) != VK_SUCCESS) {
       throw std::runtime_error("Failed to create command pool!");
     }
     if(Global::enableValidationLayers) std::cout << "Command pool created successfully\n" << std::endl;
   }
   void graphicspipeline::destroyCommandPool() {
-    vkDestroyCommandPool(Global::device, commandPool, nullptr);
+    vkDestroyCommandPool(Global::device, Global::commandPool, nullptr);
   }
   void graphicspipeline::createCommandBuffer() {
+    Global::commandBuffers.resize(Global::MAX_FRAMES_IN_FLIGHT);
+
     VkCommandBufferAllocateInfo allocInfo{};
     allocInfo.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_ALLOCATE_INFO;
-    allocInfo.commandPool = commandPool;
+    allocInfo.commandPool = Global::commandPool;
     allocInfo.level = VK_COMMAND_BUFFER_LEVEL_PRIMARY;
-    allocInfo.commandBufferCount = 1;
+    allocInfo.commandBufferCount = (uint32_t) Global::commandBuffers.size();
 
-    if(vkAllocateCommandBuffers(Global::device, &allocInfo, &commandBuffer) != VK_SUCCESS) {
+    if(vkAllocateCommandBuffers(Global::device, &allocInfo, Global::commandBuffers.data()) != VK_SUCCESS) {
       throw std::runtime_error("Failed to allocate command buffers");
     }
     if(Global::enableValidationLayers) std::cout << "Allocated command buffers successfully\n" << std::endl;
   }
 
-  void recordCommandBuffer(VkCommandBuffer commandBuffer, uint32_t imageIndex) {
+  void graphicspipeline::recordCommandBuffer(VkCommandBuffer commandBuffer, uint32_t imageIndex) {
     VkCommandBufferBeginInfo beginInfo{};
     beginInfo.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_BEGIN_INFO;
     beginInfo.flags = 0; // Optional

src/graphics/graphicspipeline.h

@@ -13,5 +13,6 @@ namespace Graphics {
       void createCommandPool();
       void destroyCommandPool();
       void createCommandBuffer();
+      void recordCommandBuffer(VkCommandBuffer cmndBuffer, uint32_t imageIndex);
   };
 }

src/graphics/render.cpp

@@ -0,0 +1,113 @@
+#include "render.h"
+#include "graphicspipeline.h"
+namespace RenderPresent {
+
+  std::vector<VkSemaphore> imageAvailableSemaphores;
+  std::vector<VkSemaphore> renderFinishedSemaphores;
+  std::vector<VkFence> inFlightFences;
+  Graphics::graphicspipeline pipeline;
+  uint32_t currentFrame = 0;
+  // At a high level, rendering in Vulkan consists of 5 steps:
+  // Wait for the previous frame, acquire a image from the swap chain
+  // record a comman d buffer which draws the scene onto that image
+  // submit the recorded command buffer and present the image!
+  void render::drawFrame() {
+
+    vkWaitForFences(Global::device, 1, &inFlightFences[currentFrame], VK_TRUE, UINT64_MAX);
+    vkResetFences(Global::device, 1, &inFlightFences[currentFrame]);
+
+    uint32_t imageIndex;
+    vkAcquireNextImageKHR(Global::device, Global::swapChain, UINT64_MAX, imageAvailableSemaphores[currentFrame], VK_NULL_HANDLE, &imageIndex);
+
+    vkResetCommandBuffer(Global::commandBuffers[currentFrame], /*VkCommandBufferResetFlagBits*/ 0);
+    pipeline.recordCommandBuffer(Global::commandBuffers[currentFrame], imageIndex);
+
+    VkSubmitInfo submitInfo{};
+    submitInfo.sType = VK_STRUCTURE_TYPE_SUBMIT_INFO;
+
+    VkSemaphore waitSemaphores[] = {imageAvailableSemaphores[currentFrame]};
+    VkPipelineStageFlags waitStages[] = {VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT};
+    submitInfo.waitSemaphoreCount = 1;
+    submitInfo.pWaitSemaphores = waitSemaphores;
+    submitInfo.pWaitDstStageMask = waitStages;
+
+    submitInfo.commandBufferCount = 1;
+    submitInfo.pCommandBuffers = &Global::commandBuffers[currentFrame];
+
+    VkSemaphore signalSemaphores[] = {renderFinishedSemaphores[currentFrame]};
+    submitInfo.signalSemaphoreCount = 1;
+    submitInfo.pSignalSemaphores = signalSemaphores;
+
+    if (vkQueueSubmit(Global::graphicsQueue, 1, &submitInfo, inFlightFences[currentFrame]) != VK_SUCCESS) {
+      throw std::runtime_error("failed to submit draw command buffer!");
+    }
+
+    VkPresentInfoKHR presentInfo{};
+    presentInfo.sType = VK_STRUCTURE_TYPE_PRESENT_INFO_KHR;
+
+    presentInfo.waitSemaphoreCount = 1;
+    presentInfo.pWaitSemaphores = signalSemaphores;
+
+    VkSwapchainKHR swapChains[] = {Global::swapChain};
+    presentInfo.swapchainCount = 1;
+    presentInfo.pSwapchains = swapChains;
+
+    presentInfo.pImageIndices = &imageIndex;
+
+    vkQueuePresentKHR(Global::presentQueue, &presentInfo);
+    currentFrame = (currentFrame + 1) % Global::MAX_FRAMES_IN_FLIGHT;
+  }
+  #pragma info
+  // SEMAPHORES
+  // Synchronization of execution on the GPU in Vulkan is *explicit* The Order of ops is up to us to 
+  // define the how we want things to run. 
+  // Similarly, Semaphores are used to add order between queue ops. There are 2 kinds of Semaphores; binary, and timeline.
+  // We are using Binary semaphores, which can be signaled or unsignaled.
+  // Semaphores are initizalized unsignaled, the way we use them to order queue operations is by providing the same semaphore in one queue op and a wait in another.
+  // For example:
+  // VkCommandBuffer QueueOne, QueueTwo = ...
+  // VkSemaphore semaphore = ...
+  // enqueue QueueOne, Signal semaphore when done, start now.
+  // vkQueueSubmit(work: QueueOne, signal: semaphore, wait: none)
+  // enqueue QueueTwo, wait on semaphore to start
+  // vkQueueSubmit(work: QueueTwo, signal: None, wait: semaphore)
+  // FENCES
+  // Fences are basically semaphores for the CPU! Otherwise known as the host. If the host needs to know when the GPU has finished a task, we use a fence. 
+  // VkCommandBuffer cmndBuf = ...
+  // VkFence fence = ...
+  // Start work immediately, signal fence when done.
+  // vkQueueSubmit(work: cmndBuf, fence: fence)
+  // vkWaitForFence(fence)
+  // doStuffOnceFenceDone()
+  #pragma endinfo
+
+  void render::createSyncObject() {
+    imageAvailableSemaphores.resize(Global::MAX_FRAMES_IN_FLIGHT);
+    renderFinishedSemaphores.resize(Global::MAX_FRAMES_IN_FLIGHT);
+    inFlightFences.resize(Global::MAX_FRAMES_IN_FLIGHT);
+
+    VkSemaphoreCreateInfo semaphoreInfo{};
+    semaphoreInfo.sType = VK_STRUCTURE_TYPE_SEMAPHORE_CREATE_INFO;
+
+    VkFenceCreateInfo fenceInfo{};
+    fenceInfo.sType = VK_STRUCTURE_TYPE_FENCE_CREATE_INFO;
+    fenceInfo.flags = VK_FENCE_CREATE_SIGNALED_BIT;
+
+    for (size_t i = 0; i < Global::MAX_FRAMES_IN_FLIGHT; i++) {
+      if(vkCreateSemaphore(Global::device, &semaphoreInfo, nullptr, &imageAvailableSemaphores[i]) != VK_SUCCESS ||
+        vkCreateSemaphore(Global::device, &semaphoreInfo, nullptr, &renderFinishedSemaphores[i]) != VK_SUCCESS ||
+        vkCreateFence(Global::device, &fenceInfo, nullptr, &inFlightFences[i]) != VK_SUCCESS) {
+        throw std::runtime_error("Failed to create semaphores!");
+      }
+    }
+
+  
+  }
+  void destroyFenceSemaphore() {
+    for (size_t i = 0; i < Global::MAX_FRAMES_IN_FLIGHT; i++) {
+      vkDestroySemaphore(Global::device, imageAvailableSemaphores[i], nullptr);
+      vkDestroySemaphore(Global::device, renderFinishedSemaphores[i], nullptr);
+      vkDestroyFence(Global::device, inFlightFences[i], nullptr);
+    }
+  }
+}

src/graphics/render.h

@@ -0,0 +1,11 @@
+#pragma once
+#include "../global.h"
+
+
+namespace RenderPresent {
+class render {
+  public:
+    void drawFrame();
+    void createSyncObject();
+  };
+}

src/main.cpp

@@ -1,6 +1,7 @@
 #include "devicelibrary.h" // Device Library includes global, redundant to include with it here
 #include "debug/vulkandebuglibs.h"
 #include "graphics/graphicspipeline.h"
+#include "graphics/render.h"
 
 #include <cstdint>
 #include <cstring>
@@ -25,6 +26,7 @@ private:
   DeviceControl::devicelibrary deviceLibs;
   Debug::vulkandebuglibs debugController;
   Graphics::graphicspipeline graphicsPipeline;
+  RenderPresent::render renderPresentation;
   GLFWwindow* window;
   VkInstance instance;
 
@@ -52,6 +54,7 @@ private:
     graphicsPipeline.createFramebuffers();
     graphicsPipeline.createCommandPool();
     graphicsPipeline.createCommandBuffer();
+    renderPresentation.createSyncObject();
   }
 
   void createInstance() {
@@ -77,7 +80,9 @@ private:
   void mainLoop() {                                               // This loop just updates the GLFW window.
     while (!glfwWindowShouldClose(window)) {
       glfwPollEvents();
+      renderPresentation.drawFrame();
     }
+    vkDeviceWaitIdle(Global::device);
   }
 
   void cleanup() {                                                // Similar to the last handoff, destroy the utils in a safe manner in the library!