pureinstance.c

/*
 * headless_vk_instance_simple.c
 * Uses standard vulkan.h with macros — works perfectly on headless systems.
 */
 
#if 1
#include <vulkan/vulkan.h>
#include <stdio.h>
#include <stdlib.h>
 
int main(void) {
    uint32_t device_count = 0;
    uint32_t i = 0;
 
    VkPhysicalDevice* devices;
 
 
    VkApplicationInfo app_info;
 
    VkInstanceCreateInfo create_info;
    VkInstance instance;
 
    VkResult res;
 
    app_info.sType = VK_STRUCTURE_TYPE_APPLICATION_INFO;
    app_info.pApplicationName = "HeadlessTest";
    app_info.applicationVersion = VK_MAKE_API_VERSION(0, 1, 0, 0);
    app_info.pEngineName = "NoEngine";
    app_info.engineVersion = VK_MAKE_API_VERSION(0, 1, 0, 0);
    app_info.apiVersion = VK_API_VERSION_1_3;
 
    create_info.sType = VK_STRUCTURE_TYPE_INSTANCE_CREATE_INFO;
    create_info.pApplicationInfo = &app_info;
    create_info.enabledLayerCount = 0;
    create_info.ppEnabledLayerNames = NULL;
    create_info.enabledExtensionCount = 0;
    create_info.ppEnabledExtensionNames = NULL;
 
    res = vkCreateInstance(&create_info, NULL, &instance);
 
 
 
    if (res != VK_SUCCESS) {
        fprintf(stderr, "Failed to create instance: %d\n", res);
        return EXIT_FAILURE;
    }
    printf("Vulkan instance created (headless OK).\n");
 
    vkEnumeratePhysicalDevices(instance, &device_count, NULL);
    if (device_count == 0) {
        fprintf(stderr, "No physical devices found.\n");
        vkDestroyInstance(instance, NULL);
        return EXIT_FAILURE;
    }
 
    printf("Found %u physical device(s).\n", device_count);
 
    devices = malloc((size_t)(device_count * sizeof(VkPhysicalDevice)));
    vkEnumeratePhysicalDevices(instance, &device_count, devices);
 
    for (i = 0; i < device_count; ++i) {
        VkPhysicalDeviceProperties props;
        vkGetPhysicalDeviceProperties(devices[i], &props);
        printf("  [%u] %s\n", i, props.deviceName);
    }
    free(devices);
 
    vkDestroyInstance(instance, NULL);
    printf("Instance destroyed.\n");
 
    return EXIT_SUCCESS;
}
#else
int main(void) {
    return 0;
}
#endif