launcher: add GPU selection

src/graphics/presentation/window/vulkanWindow.cpp

@@ -169,7 +169,12 @@ static void VulkanFindPhysicalDevice(vk::Instance instance, vk::SurfaceKHR surfa
 	EXIT_NOT_IMPLEMENTED(devices.empty());
 
 	if (Config::GetGpuIndex() >= 0) {
-		devices = {devices[Config::GetGpuIndex()]};
+		if (static_cast<size_t>(Config::GetGpuIndex()) < devices.size()) {
+			devices = {devices[Config::GetGpuIndex()]};
+		} else {
+			LOGF("Vulkan GPU index %d is unavailable; selecting automatically\n",
+			     Config::GetGpuIndex());
+		}
 	}
 
 	vk::PhysicalDevice  best_device       = nullptr;

src/launcher/CMakeLists.txt

@@ -20,7 +20,7 @@ add_executable(launcher WIN32
 )
 
 
-target_link_libraries(launcher Qt6::Concurrent Qt6::Network Qt6::Widgets kyty_git_version)
+target_link_libraries(launcher Qt6::Concurrent Qt6::Network Qt6::Widgets Vulkan::Headers kyty_git_version)
 if(WIN32)
 target_link_libraries(launcher setupapi)
 endif()

src/launcher/forms/configuration_edit_dialog.ui

@@ -127,13 +127,23 @@
           <property name="toolTip"><string>Optimize shaders for code size or performance</string></property>
          </widget>
         </item>
+        <item row="4" column="0">
+         <widget class="QLabel" name="label_gpu">
+          <property name="text"><string>GPU:</string></property>
+         </widget>
+        </item>
         <item row="4" column="1">
+         <widget class="QComboBox" name="comboBox_gpu">
+          <property name="toolTip"><string>Graphics device used by the emulator</string></property>
+         </widget>
+        </item>
+        <item row="5" column="1">
          <widget class="QCheckBox" name="checkBox_fullscreen">
           <property name="toolTip"><string>Run in borderless desktop fullscreen</string></property>
           <property name="text"><string>Fullscreen</string></property>
          </widget>
         </item>
-        <item row="5" column="1">
+        <item row="6" column="1">
          <widget class="QCheckBox" name="checkBox_readback">
           <property name="toolTip"><string>Read back writable linear images</string></property>
           <property name="text"><string>Enable readback</string></property>

src/launcher/include/configuration.h

@@ -94,6 +94,7 @@ public:
 	QString                user_name                   = "Kyty";
 	int                    user_id                     = Config::DEFAULT_USER_ID;
 	PresentMode            present_mode                = PresentMode::Fifo;
+	int                    gpu_index                   = -1;
 	bool                   fullscreen_enabled          = false;
 	bool                   readback_linear_images      = false;
 	int                    vblank_frequency            = 60;
@@ -121,6 +122,7 @@ public:
 		user_name                   = other.user_name;
 		user_id                     = other.user_id;
 		present_mode                = other.present_mode;
+		gpu_index                   = other.gpu_index;
 		fullscreen_enabled          = other.fullscreen_enabled;
 		readback_linear_images      = other.readback_linear_images;
 		vblank_frequency            = other.vblank_frequency;
@@ -165,6 +167,7 @@ public:
 		KYTY_CFG_SET(user_name);
 		KYTY_CFG_SET(user_id);
 		KYTY_CFG_SET(present_mode);
+		KYTY_CFG_SET(gpu_index);
 		KYTY_CFG_SET(fullscreen_enabled);
 		KYTY_CFG_SET(readback_linear_images);
 		KYTY_CFG_SET(vblank_frequency);
@@ -200,6 +203,7 @@ public:
 		                         ? saved_user_id
 		                         : Config::DEFAULT_USER_ID;
 		KYTY_CFG_GET(present_mode);
+		gpu_index = s->value("gpu_index", -1).toInt();
 		if (EnumToText(present_mode).isEmpty()) {
 			present_mode = PresentMode::Fifo;
 		}

src/launcher/src/configurationEditDialog.cpp

@@ -7,6 +7,7 @@
 #include <QAbstractItemView>
 #include <QCheckBox>
 #include <QComboBox>
+#include <QCoreApplication>
 #include <QDir>
 #include <QFileDialog>
 #include <QFileInfo>
@@ -25,6 +26,8 @@
 #include <QToolButton>
 #include <QTreeView>
 #include <QVBoxLayout>
+#include <QVulkanInstance>
+#include <QVulkanWindow>
 #include <QtAlgorithms>
 
 #include "ui_configuration_edit_dialog.h"
@@ -163,6 +166,35 @@ void ConfigurationEditDialog::Init(const Configuration& info) {
 	m_ui->spinBox_user_id->setValue(info.user_id);
 	ListInit(m_ui->comboBox_screen_resolution, info.screen_resolution);
 	ListInit(m_ui->comboBox_present_mode, info.present_mode);
+	m_ui->comboBox_gpu->clear();
+	m_ui->comboBox_gpu->addItem(tr("Auto"));
+#if defined(__APPLE__)
+	if (!qEnvironmentVariableIsSet("QT_VULKAN_LIB")) {
+		const auto base    = QCoreApplication::applicationDirPath();
+		auto       library = base + "/libMoltenVK.dylib";
+		if (!QFileInfo::exists(library)) {
+			library = base + "/../Frameworks/libMoltenVK.dylib";
+		}
+		if (QFileInfo::exists(library)) {
+			qputenv("QT_VULKAN_LIB", library.toUtf8());
+		}
+	}
+#endif
+	QVulkanInstance instance;
+	instance.setApiVersion(QVersionNumber(1, 3, 0));
+#if !defined(__APPLE__)
+	instance.setFlags(QVulkanInstance::NoPortabilityDrivers);
+#endif
+	if (instance.create()) {
+		QVulkanWindow window;
+		window.setVulkanInstance(&instance);
+		for (const auto& device: window.availablePhysicalDevices()) {
+			m_ui->comboBox_gpu->addItem(QString::fromUtf8(device.deviceName));
+		}
+	}
+	m_ui->comboBox_gpu->setCurrentIndex(
+	    info.gpu_index >= 0 && info.gpu_index < m_ui->comboBox_gpu->count() - 1 ? info.gpu_index + 1
+	                                                                            : 0);
 	m_ui->checkBox_fullscreen->setChecked(info.fullscreen_enabled);
 	m_ui->checkBox_readback->setChecked(info.readback_linear_images);
 	m_ui->spinBox_vblank_frequency->setValue(info.vblank_frequency);
@@ -306,6 +338,7 @@ static void UpdateInfo(Configuration& info, Ui::ConfigurationEditDialog& ui) {
 	    TextToEnum<Configuration::Resolution>(ui.comboBox_screen_resolution->currentText());
 	info.present_mode =
 	    TextToEnum<Configuration::PresentMode>(ui.comboBox_present_mode->currentText());
+	info.gpu_index                 = ui.comboBox_gpu->currentIndex() - 1;
 	info.fullscreen_enabled        = ui.checkBox_fullscreen->isChecked();
 	info.readback_linear_images    = ui.checkBox_readback->isChecked();
 	info.vblank_frequency          = ui.spinBox_vblank_frequency->value();

src/launcher/src/mainDialog.cpp

@@ -229,6 +229,9 @@ static QStringList CreateEmulatorArgs(const Configuration& info) {
 	args << "--user-name" << info.user_name;
 	args << "--user-id" << QString::number(info.user_id);
 	args << "--present-mode" << EnumToText(info.present_mode);
+	if (info.gpu_index >= 0) {
+		args << "--gpu" << QString::number(info.gpu_index);
+	}
 	if (info.fullscreen_enabled) {
 		args << "--fullscreen";
 	}