From f93891f1fd9fe5acaac7466209598fef069c4576 Mon Sep 17 00:00:00 2001
From: lukas <lukas.heiligenbrunner@gmail.com>
Date: Sun, 3 May 2020 00:33:11 +0200
Subject: [PATCH] further vulkan stuff

---
 main.cpp | 97 ++++++++++++++++++++++++++++++++++++++++++++++++--------
 1 file changed, 84 insertions(+), 13 deletions(-)

diff --git a/main.cpp b/main.cpp
index d7e499e..5e30c77 100644
--- a/main.cpp
+++ b/main.cpp
@@ -1,8 +1,25 @@
 #include <iostream>
 #include <vector>
+
+#define GLFW_INCLUDE_VULKAN
+
+#include <GLFW/glfw3.h>
 #include "vulkan/vulkan.h"
 
-int main() {
+VkInstance instance;
+VkDevice device;
+VkSurfaceKHR surface;
+GLFWwindow *window;
+
+void startGlfw() {
+    glfwInit();
+    glfwWindowHint(GLFW_CLIENT_API, GLFW_NO_API);
+    glfwWindowHint(GLFW_RESIZABLE, false);
+
+    window = glfwCreateWindow(400, 300, "Vulkan Test", nullptr, nullptr);
+}
+
+void startVulkan() {
     VkApplicationInfo appinfo; // general app info
     appinfo.sType = VK_STRUCTURE_TYPE_APPLICATION_INFO;
     appinfo.pNext = nullptr;
@@ -29,6 +46,9 @@ int main() {
             "VK_LAYER_NV_optimus"
     };
 
+    uint32_t amountOfGlfwExtensins = 0;
+    auto glfWExtensions = glfwGetRequiredInstanceExtensions(&amountOfGlfwExtensins);
+
     VkInstanceCreateInfo instanceInfo;
     instanceInfo.sType = VK_STRUCTURE_TYPE_INSTANCE_CREATE_INFO;
     instanceInfo.pNext = nullptr;
@@ -36,15 +56,19 @@ int main() {
     instanceInfo.pApplicationInfo = &appinfo;
     instanceInfo.enabledLayerCount = validationLayers.size();
     instanceInfo.ppEnabledLayerNames = validationLayers.data();
-    instanceInfo.enabledExtensionCount = 0;
-    instanceInfo.ppEnabledExtensionNames = nullptr;
+    instanceInfo.enabledExtensionCount = amountOfGlfwExtensins;
+    instanceInfo.ppEnabledExtensionNames = glfWExtensions;
 
-    VkInstance instance;
     // create vulkan instance
     if (vkCreateInstance(&instanceInfo, nullptr, &instance) != VK_SUCCESS) {
         std::cout << "error on creating vkinstance" << std::endl;
     }
 
+    if (glfwCreateWindowSurface(instance, window, nullptr, &surface) != VK_SUCCESS) {
+        std::cout << "error on creating surface" << std::endl;
+    }
+
+
     std::cout << "detecting gpus." << std::endl;
 
     uint32_t physicaldevicesnumber = 0;
@@ -75,10 +99,36 @@ int main() {
         std::cout << std::endl;
     }
 
+    VkSurfaceCapabilitiesKHR surfaceCapabilities;
+    vkGetPhysicalDeviceSurfaceCapabilitiesKHR(physicalDevices.at(0), surface, &surfaceCapabilities);
+    std::cout << "\tminImageCount: " << surfaceCapabilities.minImageCount << std::endl;
+    std::cout << "\tmaxImageCount: " << surfaceCapabilities.maxImageCount << std::endl;
+    std::cout << "\tcurrentExtent: " << surfaceCapabilities.currentExtent.height << "/"
+              << surfaceCapabilities.currentExtent.width << std::endl;
+    std::cout << "\tminImageExtent: " << surfaceCapabilities.minImageExtent.height << "/"
+              << surfaceCapabilities.minImageExtent.width << std::endl;
+    std::cout << "\tmaxImageExtent: " << surfaceCapabilities.maxImageExtent.height << "/"
+              << surfaceCapabilities.maxImageExtent.width << std::endl;
+    std::cout << "\tmaxImageArrayLayers: " << surfaceCapabilities.maxImageArrayLayers << std::endl;
+    std::cout << "\tsupportedTransforms: " << surfaceCapabilities.supportedTransforms << std::endl;
+    std::cout << "\tcurrentTransform: " << surfaceCapabilities.currentTransform << std::endl;
+    std::cout << "\tsupportedCompositeAlpha: " << surfaceCapabilities.supportedCompositeAlpha << std::endl;
+    std::cout << "\tsupportedUsageFlags: " << surfaceCapabilities.supportedUsageFlags << std::endl;
+
+    uint32_t amountOfFormats = 0;
+    vkGetPhysicalDeviceSurfaceFormatsKHR(physicalDevices.at(0), surface, &amountOfFormats, nullptr);
+    auto *surfaceFormats = new VkSurfaceFormatKHR[amountOfFormats];
+    vkGetPhysicalDeviceSurfaceFormatsKHR(physicalDevices.at(0), surface, &amountOfFormats, surfaceFormats);
+
+    for(int i = 0; i < amountOfFormats; i++){
+        std::cout << "format supported: " << surfaceFormats[i].format << std::endl;
+    }
+
+
     uint32_t amountOfExtensions = 0;
-    vkEnumerateInstanceExtensionProperties(NULL, &amountOfExtensions, NULL);
-    VkExtensionProperties *extensions = new VkExtensionProperties[amountOfExtensions];
-    vkEnumerateInstanceExtensionProperties(NULL, &amountOfExtensions, extensions);
+    vkEnumerateInstanceExtensionProperties(nullptr, &amountOfExtensions, nullptr);
+    auto *extensions = new VkExtensionProperties[amountOfExtensions];
+    vkEnumerateInstanceExtensionProperties(nullptr, &amountOfExtensions, extensions);
     std::cout << "found " << amountOfExtensions << " extensions" << std::endl;
 
     for (int i = 0; i < amountOfExtensions; i++) {
@@ -110,19 +160,40 @@ int main() {
     deviceCreateInfo.pEnabledFeatures = &usedFeatures;
 
     std::cout << "creating logical device" << std::endl;
-    VkDevice device;
+
     if (vkCreateDevice(physicalDevices.at(0), &deviceCreateInfo, NULL, &device) !=
         VK_SUCCESS) { // todo select right physicaldevice
         std::cout << "create logical device failed." << std::endl;
     }
 
-    // stop jobs
-    vkDeviceWaitIdle(device); // waits until any work has finished
-    vkDestroyDevice(device, nullptr);
-    vkDestroyInstance(instance, nullptr);
-
     delete[] layers;
     delete[] extensions;
+}
+
+void gameLoop() {
+    while (!glfwWindowShouldClose(window)) {
+        glfwPollEvents();
+    }
+}
+
+void shutdownVulkan() {
+    vkDeviceWaitIdle(device); // waits until any work has finished
+    vkDestroyDevice(device, nullptr);
+    vkDestroySurfaceKHR(instance, surface, nullptr);
+    vkDestroyInstance(instance, nullptr);
+}
+
+void shutdownGlfw() {
+    glfwDestroyWindow(window);
+}
+
+
+int main() {
+    startGlfw();
+    startVulkan();
+    gameLoop();
+    shutdownVulkan();
+    shutdownGlfw();
 
     return 0;
 }