Fix physical device selection (#29)

Author: shg8

apps/viewer/main.cpp

@@ -15,7 +15,7 @@ int main(int argc, char** argv) {
         parser, "validation-layers", "Enable Vulkan validation layers", {"validation"}
     };
     args::Flag verboseFlag{parser, "verbose", "Enable verbose logging", {'v', "verbose"}};
-    args::ValueFlag<uint8_t> physicalDeviceIdFlag{
+    args::ValueFlag<uint32_t> physicalDeviceIdFlag{
         parser, "physical-device", "Select physical device by index", {'d', "device"}
     };
     args::Flag immediateSwapchainFlag{
@@ -73,7 +73,7 @@ int main(int argc, char** argv) {
     }
 
     if (physicalDeviceIdFlag) {
-        config.physicalDeviceId = std::make_optional<uint8_t>(args::get(physicalDeviceIdFlag));
+        config.physicalDeviceId = std::make_optional<uint8_t>(static_cast<uint8_t>(args::get(physicalDeviceIdFlag)));
     }
 
     if (immediateSwapchainFlag) {

src/vulkan/VulkanContext.cpp

@@ -145,6 +145,10 @@ void VulkanContext::selectPhysicalDevice(std::optional<uint8_t> id, std::optiona
         spdlog::info("[{}] {}", ind++, device.getProperties().deviceName);
     }
 
+    if (surface.has_value()) {
+        deviceExtensions.push_back(VK_KHR_SWAPCHAIN_EXTENSION_NAME);
+    }
+
     if (id.has_value()) {
         if (devices.size() <= id.value()) {
             throw std::runtime_error("Invalid physical device id");
@@ -154,10 +158,6 @@ void VulkanContext::selectPhysicalDevice(std::optional<uint8_t> id, std::optiona
         return;
     }
 
-    if (surface.has_value()) {
-        deviceExtensions.push_back(VK_KHR_SWAPCHAIN_EXTENSION_NAME);
-    }
-
     auto suitableDevices = std::vector<vk::PhysicalDevice>{};
     for (auto& device: devices) {
         if (isDeviceSuitable(device, surface)) {