Rendering a triangle to the screen, phew!

.gitattributes

@@ -0,0 +1 @@
+*.png filter=lfs diff=lfs merge=lfs -text

Hello_triangle/main.cpp

@@ -1,6 +1,6 @@
 /*
     Following the vulkan tutorial on :
-   https://vulkan-tutorial.com/en/Drawing_a_triangle/Presentation/Swap_chain
+   https://vulkan-tutorial.com/en/Drawing_a_triangle/Drawing/Frames_in_flight
 */
 
 #define GLFW_INCLUDE_VULKAN
@@ -66,6 +66,9 @@ const std::vector<const char*> deviceExtensions = {
         std::vector<VkFramebuffer> swapchainFrameBuffers;
         VkCommandPool commandPool;
         VkCommandBuffer commandBuffer;
+        VkSemaphore imageAvailableSemaphore;
+        VkSemaphore renderFinishedSemaphore;
+        VkFence inFlightFence;
 
 
 
@@ -98,6 +101,25 @@ const std::vector<const char*> deviceExtensions = {
             createFramebuffers();
             createCommandPool();
             createCommandBuffer();
+            createSyncObjects();
+        }
+
+        void createSyncObjects() {
+            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;
+
+            if (vkCreateSemaphore(device, &semaphoreInfo, nullptr, &imageAvailableSemaphore) != VK_SUCCESS ||
+                vkCreateSemaphore(device, &semaphoreInfo, nullptr, &renderFinishedSemaphore) != VK_SUCCESS ||
+                vkCreateFence(device, &fenceInfo, nullptr, &inFlightFence) != VK_SUCCESS) {
+                throw std::runtime_error("failed to create semaphores!");
+            }
+
+
+
         }
 
         void recordCommandBuffer(VkCommandBuffer commandBuffer, uint32_t imageIndex) {
@@ -324,12 +346,26 @@ const std::vector<const char*> deviceExtensions = {
             subpass.colorAttachmentCount = 1;
             subpass.pColorAttachments = &colorAttachementRef;
 
+            VkSubpassDependency dependency{};
+            dependency.srcSubpass = VK_SUBPASS_EXTERNAL;
+            dependency.dstSubpass = 0;
+
+            dependency.srcStageMask = VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT;
+            dependency.srcAccessMask = 0;
+
+            dependency.dstStageMask = VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT;
+            dependency.dstAccessMask = VK_ACCESS_COLOR_ATTACHMENT_WRITE_BIT;
+
             VkRenderPassCreateInfo renderPassInfo{};
             renderPassInfo.sType = VK_STRUCTURE_TYPE_RENDER_PASS_CREATE_INFO;
             renderPassInfo.attachmentCount = 1;
             renderPassInfo.pAttachments = &colorAttachment;
             renderPassInfo.subpassCount = 1;
             renderPassInfo.pSubpasses = &subpass;
+            renderPassInfo.dependencyCount = 1;
+            renderPassInfo.pDependencies = &dependency;
+
+            
 
             if (vkCreateRenderPass(device, &renderPassInfo, nullptr, &renderPass) != VK_SUCCESS) {
                 throw std::runtime_error("Failed to create render pass!");
@@ -815,10 +851,68 @@ const std::vector<const char*> deviceExtensions = {
         void mainLoop(){
                 while (!glfwWindowShouldClose(window)){
                     glfwPollEvents();
-                }
+                    drawFrame();
                 }
 
+                vkDeviceWaitIdle(device);
+        }
+
+
+        void drawFrame() {
+            vkWaitForFences(device, 1, &inFlightFence, VK_TRUE, UINT64_MAX);
+            vkResetFences(device, 1, &inFlightFence);
+
+            uint32_t imageIndex;
+            vkAcquireNextImageKHR(device, swapChain, UINT64_MAX, imageAvailableSemaphore, VK_NULL_HANDLE, &imageIndex);
+
+            vkResetCommandBuffer(commandBuffer, 0);
+            recordCommandBuffer(commandBuffer, imageIndex);
+
+            VkSubmitInfo submitInfo{};
+            submitInfo.sType = VK_STRUCTURE_TYPE_SUBMIT_INFO;
+            
+            VkSemaphore waitSemaphores[] = { imageAvailableSemaphore };
+            VkPipelineStageFlags waitstages[] = { VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT };
+            submitInfo.waitSemaphoreCount = 1;
+            submitInfo.pWaitSemaphores = waitSemaphores;
+            submitInfo.pWaitDstStageMask = waitstages;
+
+            submitInfo.commandBufferCount = 1;
+            submitInfo.pCommandBuffers = &commandBuffer;
+
+            VkSemaphore signalSemaphore[] = { renderFinishedSemaphore };
+            submitInfo.signalSemaphoreCount = 1;
+            submitInfo.pSignalSemaphores = signalSemaphore;
+
+            if (vkQueueSubmit(graphicsQueue,1, &submitInfo, inFlightFence) != 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 = signalSemaphore;
+
+            VkSwapchainKHR swapChains[] = { swapChain };
+            presentInfo.swapchainCount = 1;
+            presentInfo.pSwapchains = swapChains;
+            presentInfo.pImageIndices = &imageIndex;
+
+            vkQueuePresentKHR(presentQueue, &presentInfo);
+
+
+
+
+        }
+
+
         void cleanup(){
+
+            vkDestroySemaphore(device, imageAvailableSemaphore, nullptr);
+            vkDestroySemaphore(device, renderFinishedSemaphore, nullptr);
+            vkDestroyFence(device, inFlightFence, nullptr);
+
             vkDestroyCommandPool(device, commandPool, nullptr);
 
             for (auto framebuffer : swapchainFrameBuffers) {

readme.md

@@ -1,3 +1,8 @@
 # Vulkan API demo's
 
 ![Vulkan](https://www.vulkan.org/user/pages/01.home/Vulkan-Wide.png) 
+
+
+
+
+![Rendering of first Triangle using vulkan](FirstTriangle.png)