Ch01InstanceCreation.java

package javavulkantutorial;

import org.lwjgl.PointerBuffer;
import org.lwjgl.system.MemoryStack;
import org.lwjgl.vulkan.VkApplicationInfo;
import org.lwjgl.vulkan.VkInstance;
import org.lwjgl.vulkan.VkInstanceCreateInfo;

import static org.lwjgl.glfw.GLFW.*;
import static org.lwjgl.glfw.GLFW.glfwTerminate;
import static org.lwjgl.glfw.GLFWVulkan.glfwGetRequiredInstanceExtensions;
import static org.lwjgl.system.MemoryStack.stackPush;
import static org.lwjgl.system.MemoryUtil.NULL;
import static org.lwjgl.vulkan.VK10.*;

public class Ch01InstanceCreation {

    private static class HelloTriangleApplication {

        private static final int WIDTH = 800;
        private static final int HEIGHT = 600;

        // ======= FIELDS ======= //

        private long window;
        private VkInstance instance;

        // ======= METHODS ======= //

        public void run() {
            initWindow();
            initVulkan();
            mainLoop();
            cleanup();
        }

        private void initWindow() {

            if(!glfwInit()) {
                throw new RuntimeException("Cannot initialize GLFW");
            }

            glfwWindowHint(GLFW_CLIENT_API, GLFW_NO_API);
            glfwWindowHint(GLFW_RESIZABLE, GLFW_FALSE);

            String title = getClass().getEnclosingClass().getSimpleName();

            window = glfwCreateWindow(WIDTH, HEIGHT, title, NULL, NULL);

            if(window == NULL) {
                throw new RuntimeException("Cannot create window");
            }
        }

        private void initVulkan() {
            createInstance();
        }

        private void mainLoop() {

            while(!glfwWindowShouldClose(window)) {
                glfwPollEvents();
            }

        }

        private void cleanup() {

            vkDestroyInstance(instance, null);

            glfwDestroyWindow(window);

            glfwTerminate();
        }

        private void createInstance() {

            try(MemoryStack stack = stackPush()) {

                // Use calloc to initialize the structs with 0s. Otherwise, the program can crash due to random values

                VkApplicationInfo appInfo = VkApplicationInfo.calloc(stack);

                appInfo.sType(VK_STRUCTURE_TYPE_APPLICATION_INFO);
                appInfo.pApplicationName(stack.UTF8Safe("Hello Triangle"));
                appInfo.applicationVersion(VK_MAKE_VERSION(1, 0, 0));
                appInfo.pEngineName(stack.UTF8Safe("No Engine"));
                appInfo.engineVersion(VK_MAKE_VERSION(1, 0, 0));
                appInfo.apiVersion(VK_API_VERSION_1_0);

                VkInstanceCreateInfo createInfo = VkInstanceCreateInfo.calloc(stack);

                createInfo.sType(VK_STRUCTURE_TYPE_INSTANCE_CREATE_INFO);
                createInfo.pApplicationInfo(appInfo);
                // enabledExtensionCount is implicitly set when you call ppEnabledExtensionNames
                createInfo.ppEnabledExtensionNames(glfwGetRequiredInstanceExtensions());
                // same with enabledLayerCount
                createInfo.ppEnabledLayerNames(null);

                // We need to retrieve the pointer of the created instance
                PointerBuffer instancePtr = stack.mallocPointer(1);

                if(vkCreateInstance(createInfo, null, instancePtr) != VK_SUCCESS) {
                    throw new RuntimeException("Failed to create instance");
                }

                instance = new VkInstance(instancePtr.get(0), createInfo);
            }
        }

    }

    public static void main(String[] args) {

        HelloTriangleApplication app = new HelloTriangleApplication();

        app.run();
    }
}