Vulkan Error no WSI support on physical device 0

[ragerma]

I compiled the example_glfw_vulkan and example_sdl_vulkan using g++ on CentOS 8. But when I try to run the compiled apps, both examples give me an error message saying "Error no WSI support on physical device 0". After doing some debugging, I found the issue is caused by the Intel GPU and the RTX 2060 GPU in my laptop. In line 120 of main.cpp, the code g_PhysicalDevice = gpus[0]; is using the first GPU without checking if it supports vulkan. And it turns out the first GPU (intel integrated) does not support vulkan. After changing the code to use the 2nd GPU, g_PhysicalDevice = gpus[1]; the program works properly.

[rokups]

Hey @ragerma could you please test a fix? I cant get my laptop into state that would make both GPUs detectable.

[ragerma]

I've tested the following change and it works properly on my laptop.

    // If a number >1 of GPUs got reported, find discrete GPU if present, or use first one available. This covers
    // most common cases (multi-gpu/integrated+dedicated graphics). Handling more complicated setups (multiple
    // dedicated GPUs) is out of scope of this sample.
    int use_gpu = 0;
    for (int i = 0; i < (int)gpu_count; i++)
    {
        VkPhysicalDeviceProperties properties;
        vkGetPhysicalDeviceProperties(gpus[i], &properties);
        if (properties.deviceType == VK_PHYSICAL_DEVICE_TYPE_DISCRETE_GPU)
        {
            use_gpu = i;
            break;
        }
    }

    g_PhysicalDevice = gpus[use_gpu];`

[ocornut]

Merged fix by @rokups. Thank you both!