video_core: prefer discrete gpu if available

src/common/config.cpp

@@ -12,7 +12,7 @@ namespace Config {
 bool isNeo = false;
 u32 screenWidth = 1280;
 u32 screenHeight = 720;
-u32 gpuId = 0; // Vulkan physical device no
+s32 gpuId = -1; // Vulkan physical device index. Set to negative for auto select
 std::string logFilter;
 std::string logType = "sync";
 bool isDebugDump = false;
@@ -33,7 +33,7 @@ u32 getScreenHeight() {
     return screenHeight;
 }
 
-u32 getGpuId() {
+s32 getGpuId() {
     return gpuId;
 }
 

src/common/config.h

@@ -16,7 +16,7 @@ std::string getLogType();
 
 u32 getScreenWidth();
 u32 getScreenHeight();
-u32 getGpuId();
+s32 getGpuId();
 
 bool debugDump();
 bool isLleLibc();

src/video_core/renderer_vulkan/vk_instance.cpp

@@ -1,6 +1,7 @@
 // SPDX-FileCopyrightText: Copyright 2024 shadPS4 Emulator Project
 // SPDX-License-Identifier: GPL-2.0-or-later
 
+#include <ranges>
 #include <span>
 #include <boost/container/static_vector.hpp>
 #include <fmt/format.h>
@@ -39,16 +40,37 @@ Instance::Instance(bool enable_validation, bool dump_command_buffers)
                               dump_command_buffers)},
       physical_devices{instance->enumeratePhysicalDevices()} {}
 
-Instance::Instance(Frontend::WindowSDL& window, u32 physical_device_index)
+Instance::Instance(Frontend::WindowSDL& window, s32 physical_device_index)
     : instance{CreateInstance(dl, window.getWindowInfo().type, true, false)},
-      debug_callback{CreateDebugCallback(*instance)}, physical_devices{
-                                                          instance->enumeratePhysicalDevices()} {
+      debug_callback{CreateDebugCallback(*instance)},
+      physical_devices{instance->enumeratePhysicalDevices()} {
     const std::size_t num_physical_devices = static_cast<u16>(physical_devices.size());
-    ASSERT_MSG(physical_device_index < num_physical_devices,
-               "Invalid physical device index {} provided when only {} devices exist",
-               physical_device_index, num_physical_devices);
+    ASSERT_MSG(num_physical_devices > 0, "No physical devices found");
+
+    if (physical_device_index < 0) {
+        std::vector<vk::PhysicalDeviceProperties2> properties2{};
+        for (auto const& physical : physical_devices) {
+            properties2.emplace_back(physical.getProperties2());
+        }
+        auto dev_prop2_pairs = std::views::zip(physical_devices, properties2);
+        std::sort(dev_prop2_pairs.begin(), dev_prop2_pairs.end(),
+                  [](const auto& left, const auto& right) {
+                      if (std::get<1>(left).properties.deviceType ==
+                          std::get<1>(right).properties.deviceType) {
+                          return true;
+                      }
+                      return std::get<1>(left).properties.deviceType ==
+                             vk::PhysicalDeviceType::eDiscreteGpu;
+                  });
+        physical_device = std::get<0>(dev_prop2_pairs[0]);
+    } else {
+        ASSERT_MSG(physical_device_index < num_physical_devices,
+                   "Invalid physical device index {} provided when only {} devices exist",
+                   physical_device_index, num_physical_devices);
+
+        physical_device = physical_devices[physical_device_index];
+    }
 
-    physical_device = physical_devices[physical_device_index];
     available_extensions = GetSupportedExtensions(physical_device);
     properties = physical_device.getProperties();
     if (properties.apiVersion < TargetVulkanApiVersion) {

src/video_core/renderer_vulkan/vk_instance.h

@@ -18,7 +18,7 @@ namespace Vulkan {
 class Instance {
 public:
     explicit Instance(bool validation = false, bool dump_command_buffers = false);
-    explicit Instance(Frontend::WindowSDL& window, u32 physical_device_index);
+    explicit Instance(Frontend::WindowSDL& window, s32 physical_device_index);
     ~Instance();
 
     /// Returns a formatted string for the driver version