add device clas which enumerates availble gpu devices

src/Device.cpp

@@ -0,0 +1,56 @@
+
+#include "Device.hpp"
+
+#include <iostream>
+
+Device::Device(vk::raii::Instance* instance): instance_(instance) {
+
+}
+
+Device::~Device() {
+
+}
+
+bool Device::selectPhysicalDevice() {
+
+    std::vector<vk::raii::PhysicalDevice> physicalDevices = instance_->enumeratePhysicalDevices();
+
+    if(physicalDevices.empty()) {
+        std::cout << "[" << __FUNCTION__ << ": " << __LINE__ << "] Error: no physical devices with Vulkan support found." << std::endl;
+        return false;
+    }
+
+    // validate found devices
+    uint32_t maxScore = 0;
+    for(vk::raii::PhysicalDevice& physicalDevice : physicalDevices) {
+        uint32_t capabilityScore = evaluatePhysicalDevice(physicalDevice);
+        if(capabilityScore > maxScore) {
+            maxScore = capabilityScore;
+            physicalDevice_ = physicalDevice;
+        }
+    }
+    if(maxScore = 0) {
+        std::cout << "[" << __FUNCTION__ << ": " << __LINE__ << "] Error: physical devices found, but none capable for this engine." << std::endl;
+        return false;
+    } else {
+        vk::PhysicalDeviceProperties deviceProperties = physicalDevice_.getProperties();
+        std::cout << "[" << __FUNCTION__ << ": " << __LINE__ << "] Physical device selected: " << deviceProperties.deviceName << std::endl;
+        return true;
+    }
+
+}
+
+uint32_t Device::evaluatePhysicalDevice(vk::raii::PhysicalDevice& device) {
+
+    vk::PhysicalDeviceProperties deviceProperties = device.getProperties();
+    vk::PhysicalDeviceFeatures deviceFeatures = device.getFeatures();
+
+    std::cout << "[" << __FUNCTION__ << ": " << __LINE__ << "] Physical device found: " << deviceProperties.deviceName << std::endl;
+
+    if(deviceProperties.deviceType == vk::PhysicalDeviceType::eDiscreteGpu) {
+        return 2;
+    } else {
+        return 1;
+    } // i.e. a descrete gpu is preferable to an integrated gpu
+
+}

src/Device.hpp

@@ -0,0 +1,24 @@
+
+#pragma once
+
+#include <vulkan/vulkan_raii.hpp>
+
+class Device {
+
+    public:
+
+    Device(vk::raii::Instance* instance);
+    ~Device();
+
+    // assigns a capable gpu vkdevice to physicalDevice 
+    bool selectPhysicalDevice();
+
+    private:
+
+    // gives a device a score to attempt to select the most capable device
+    uint32_t evaluatePhysicalDevice(vk::raii::PhysicalDevice& device);
+
+    vk::raii::Instance* instance_ = nullptr;
+    vk::raii::PhysicalDevice physicalDevice_ = nullptr;
+    
+};

src/Engine.cpp

@@ -3,6 +3,8 @@
 
 #include <iostream>
 
+#include "Device.hpp"
+
 Engine::Engine(Window* window): window_(window) {
 
     // cleans up this constructor 
@@ -19,8 +21,11 @@ void Engine::init() {
         std::cout << "[" << __FUNCTION__ << ": " << __LINE__ << "] Error creating Vulkan instance." << std::endl;
     }
 
-    // next steps:
     // device selection and setup
+    Device device(&instance_);
+    device.selectPhysicalDevice();
+    
+    // next steps:
     // queue creation
     // vulkan memory allocator
     // create vulkan surface