From f48c8cd2cc27f7ff1f9aeb0aa8276e823f9b837f Mon Sep 17 00:00:00 2001
From: IlyaShurupov <ilusha@workspace.com>
Date: Thu, 7 Nov 2024 17:38:39 +0300
Subject: [PATCH] pick physical device

---
 main.cpp | 40 ++++++++++++++++++++++++++++++++++++++--
 1 file changed, 38 insertions(+), 2 deletions(-)

diff --git a/main.cpp b/main.cpp
index 5d00ea5..9711b8d 100644
--- a/main.cpp
+++ b/main.cpp
@@ -35,7 +35,7 @@ private:
 
   void initVulkan() {
     createInstance();
-    // pickPhysicalDevice();
+    pickPhysicalDevice();
   }
 
   void mainLoop() {
@@ -104,9 +104,45 @@ private:
     return true;
   }
 
+  void pickPhysicalDevice() {
+    uint32_t deviceCount = 0;
+    vkEnumeratePhysicalDevices(instance, &deviceCount, nullptr);
+
+    if (deviceCount == 0) {
+      throw std::runtime_error("no gpu with vulkan support");
+    }
+
+    std::vector<VkPhysicalDevice> devices(deviceCount);
+    vkEnumeratePhysicalDevices(instance, &deviceCount, devices.data());
+
+    for (const auto& device : devices) {
+      if (isDeviceSuitable(device)) {
+        physicalDevice = device;
+        break;
+      }
+    }
+
+    if (!physicalDevice) throw std::runtime_error("no suitable gpu");
+  }
+
+  static bool isDeviceSuitable(VkPhysicalDevice device) {
+    VkPhysicalDeviceProperties properties;
+    VkPhysicalDeviceFeatures features;
+
+    vkGetPhysicalDeviceProperties(device, &properties);
+    vkGetPhysicalDeviceFeatures(device, &features);
+
+    // if (properties.deviceType != VK_PHYSICAL_DEVICE_TYPE_DISCRETE_GPU) return false;
+    if (!features.geometryShader) return false;
+
+    return true;
+  }
+
 private:
   GLFWwindow* window = nullptr;
-  VkInstance instance {};
+
+  VkInstance instance = VK_NULL_HANDLE;
+  VkPhysicalDevice physicalDevice = VK_NULL_HANDLE;
 };
 
 int main() {