Added ImGUI into the render loop, not tested atm

.clangd

@@ -6,6 +6,7 @@ CompileFlags:
     - -DINITIALIZERS_IMPL
     - -DPIPELINES_IMPL
     - -DDESCRIPTORS_IMPL
+    - -DCALLBACK_IMPL
     - -DTIMER_IMPL
     - -DLOGGER_IMPL
     - -DSERVER_INIT_IMPL

src/Engine/engine/engine.h

@@ -109,10 +109,15 @@ class Engine {
       uint32_t width,
       uint32_t height
     );
+    void buildImgui();
     void destroySwapchain();
     void drawBackground(
       VkCommandBuffer cmd
     );
+    void drawImgui(
+      VkCommandBuffer cmd,
+      VkImageView targetImageView
+    );
 
 
 };
@@ -325,6 +330,19 @@ void Engine::draw() {
 		_swapchainExtent
 	);
 
+	// Set the swapchain image layout to Attachment Optimal so ImGui can write on top of it
+	vkutil::transitionImage(
+	  cmd,
+		_swapchainImages[swapchainImageIndex],
+		VK_IMAGE_LAYOUT_TRANSFER_DST_OPTIMAL,
+		VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL
+	);
+
+	drawImgui(
+	  cmd,
+		_swapchainImageViews[swapchainImageIndex]
+	);
+
 	// Uses the present layout to display into the screen
 	vkutil::transitionImage(
 	  cmd,
@@ -384,6 +402,7 @@ void Engine::run() {
       continue;
     }
 
+    buildImgui();
     draw();
   }
   #ifdef DEBUG
@@ -890,7 +909,7 @@ void Engine::initImgui() {
       .PipelineRenderingCreateInfo {
         .sType                   = VK_STRUCTURE_TYPE_PIPELINE_RENDERING_CREATE_INFO_KHR,
         .colorAttachmentCount    = 1,
-        .pColorAttachmentFormats = &_swapchainImageFormat
+        .pColorAttachmentFormats = &_drawImage.imageFormat
       }
     },
     .UseDynamicRendering  = true
@@ -955,6 +974,19 @@ void Engine::createSwapchain(
   #endif
 }
 
+void Engine::buildImgui() {
+  // New frames
+  ImGui_ImplVulkan_NewFrame();
+  ImGui_ImplGlfw_NewFrame();
+  ImGui::NewFrame();
+
+  // Main ImGui things
+  ImGui::ShowDemoWindow();
+
+  // Finish everything
+  ImGui::Render();
+}
+
 void Engine::destroySwapchain() {
   #ifdef DEBUG
   fmt::println("[Engine:Cleanup] Destroying the swapchain...");
@@ -1011,6 +1043,38 @@ void Engine::drawBackground(
 
 }
 
+void Engine::drawImgui(
+  VkCommandBuffer cmd,
+  VkImageView targetImageView
+) {
+  VkRenderingAttachmentInfo colorAttachment {
+    vkinit::attachmentInfo(
+      targetImageView,
+      nullptr,
+      VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL
+    )
+  };
+  VkRenderingInfo renderInfo {
+    vkinit::renderingInfo(
+      _swapchainExtent,
+      &colorAttachment,
+      nullptr
+    )
+  };
+
+  vkCmdBeginRendering(
+    cmd,
+    &renderInfo
+  );
+
+  ImGui_ImplVulkan_RenderDrawData(
+    ImGui::GetDrawData(),
+    cmd
+  );
+
+  vkCmdEndRendering(cmd);
+}
+
 void Engine::immediateSubmit(
   std::function<
   void(VkCommandBuffer cmd)
@@ -1080,5 +1144,7 @@ void Engine::immediateSubmit(
 
 }
 
+
+
 #endif
 #endif

src/Engine/engine/initializers.h

@@ -2,6 +2,7 @@
 #define INITIALIZERS_H
 // Normal header
 #include "Common/Types.h"
+#include <vulkan/vulkan_core.h>
 
 namespace vkinit {
   VkCommandPoolCreateInfo commandPoolCreateInfo(
@@ -57,6 +58,17 @@ namespace vkinit {
     VkImageAspectFlags aspectFlags
   );
 
+  VkRenderingAttachmentInfo attachmentInfo(
+    VkImageView view,
+    VkClearValue* clear,
+    VkImageLayout layout /*= VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL*/
+  );
+
+  VkRenderingInfo renderingInfo(
+    VkExtent2D renderExtent,
+    VkRenderingAttachmentInfo* colorAttachment,
+    VkRenderingAttachmentInfo* depthAttachment
+  );
 }
 
 
@@ -242,6 +254,52 @@ namespace vkinit {
 
     return info;
   }
+
+  VkRenderingAttachmentInfo attachmentInfo(
+    VkImageView view,
+    VkClearValue* clear,
+    VkImageLayout layout /*= VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL*/
+  ) {
+    VkRenderingAttachmentInfo colorAttachment {
+      .sType        = VK_STRUCTURE_TYPE_RENDERING_ATTACHMENT_INFO,
+      .pNext        = nullptr,
+      .imageView    = view,
+      .imageLayout  = layout,
+      .loadOp       = clear ? VK_ATTACHMENT_LOAD_OP_CLEAR : VK_ATTACHMENT_LOAD_OP_LOAD,
+      .storeOp      = VK_ATTACHMENT_STORE_OP_STORE
+    };
+
+    if (clear) {
+      colorAttachment.clearValue = *clear;
+    }
+
+    return colorAttachment;
+  }
+
+  VkRenderingInfo renderingInfo(
+    VkExtent2D renderExtent,
+    VkRenderingAttachmentInfo* colorAttachment,
+    VkRenderingAttachmentInfo* depthAttachment
+  ) {
+    VkRenderingInfo renderInfo {
+      .sType                  = VK_STRUCTURE_TYPE_RENDERING_INFO,
+      .pNext                  = nullptr,
+      .renderArea             = VkRect2D {
+        VkOffset2D  {
+          0,
+          0
+        }, renderExtent
+      },
+      .layerCount             = 1,
+      .colorAttachmentCount   = 1,
+      .pColorAttachments      = colorAttachment,
+      .pDepthAttachment       = depthAttachment,
+      .pStencilAttachment     = nullptr
+    };
+    return renderInfo;
+  }
+
+
 }
 #endif
 #endif