nv2a/vk: Add preferred physical device to config

Author: abaire

config_spec.yml

@@ -146,6 +146,7 @@ display:
     validation_layers: bool
     debug_shaders: bool
     assert_on_validation_msg: bool
+    preferred_physical_device: string
   quality:
     surface_scale:
       type: integer

hw/xbox/nv2a/pgraph/vk/instance.c

@@ -451,19 +451,33 @@ static bool select_physical_device(PGRAPHState *pg, Error **errp)
         g_malloc_n(num_physical_devices, sizeof(VkPhysicalDevice));
     vkEnumeratePhysicalDevices(r->instance, &num_physical_devices, devices);
 
+    const char *preferred_device = g_config.display.vulkan.preferred_physical_device;
+    int preferred_device_index = -1;
+
     fprintf(stderr, "Available physical devices:\n");
     for (int i = 0; i < num_physical_devices; i++) {
         vkGetPhysicalDeviceProperties(devices[i], &r->device_props);
-        fprintf(stderr, "- %s\n", r->device_props.deviceName);
+        bool is_preferred =
+            preferred_device &&
+            !strcmp(r->device_props.deviceName, preferred_device);
+        if (is_preferred) {
+            preferred_device_index = i;
+        }
+        fprintf(stderr, "- %s%s\n", r->device_props.deviceName,
+                is_preferred ? " *" : "");
     }
 
-    // FIXME: Store preferred device
-
     r->physical_device = VK_NULL_HANDLE;
-    for (int i = 0; i < num_physical_devices; i++) {
-        if (is_device_compatible(devices[i])) {
-            r->physical_device = devices[i];
-            break;
+
+    if (preferred_device_index >= 0 &&
+        is_device_compatible(devices[preferred_device_index])) {
+        r->physical_device = devices[preferred_device_index];
+    } else {
+        for (int i = 0; i < num_physical_devices; i++) {
+            if (is_device_compatible(devices[i])) {
+                r->physical_device = devices[i];
+                break;
+            }
         }
     }
     if (r->physical_device == VK_NULL_HANDLE) {
@@ -472,6 +486,9 @@ static bool select_physical_device(PGRAPHState *pg, Error **errp)
     }
 
     vkGetPhysicalDeviceProperties(r->physical_device, &r->device_props);
+    xemu_settings_set_string(&g_config.display.vulkan.preferred_physical_device,
+                             r->device_props.deviceName);
+
     fprintf(stderr,
             "Selected physical device: %s\n"
             "- Vendor: %x, Device: %x\n"