From aa847f9c83b5b917d9ed2207b92bcdeed65862a7 Mon Sep 17 00:00:00 2001
From: JC <beaumanvienna@gmail.com>
Date: Fri, 28 Jan 2022 11:38:43 -0800
Subject: [PATCH 1/3] use multiple CPU threads to compile

---
 unixBuild.sh | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/unixBuild.sh b/unixBuild.sh
index 5fc6e80..78582be 100755
--- a/unixBuild.sh
+++ b/unixBuild.sh
@@ -2,5 +2,6 @@
 mkdir -p build
 cd build
 cmake -S ../ -B .
+export MAKEFLAGS=-j$(nproc)
 make && make Shaders && ./LveEngine
-cd ..
\ No newline at end of file
+cd ..

From 7500bfde4b405738ee68e99f0ddbbd0e6a2cc34c Mon Sep 17 00:00:00 2001
From: JC <beaumanvienna@gmail.com>
Date: Fri, 28 Jan 2022 15:40:35 -0800
Subject: [PATCH 2/3] Update unixBuild.sh

---
 unixBuild.sh | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/unixBuild.sh b/unixBuild.sh
index 78582be..5280075 100755
--- a/unixBuild.sh
+++ b/unixBuild.sh
@@ -2,6 +2,10 @@
 mkdir -p build
 cd build
 cmake -S ../ -B .
-export MAKEFLAGS=-j$(nproc)
+if [ -z "$MAKEFLAGS" ]
+then
+      export MAKEFLAGS=-j$(nproc)
+fi
+
 make && make Shaders && ./LveEngine
 cd ..

From 1abb1d7139553f06b7eb39fe1586b305c6bb151c Mon Sep 17 00:00:00 2001
From: JC <beaumanvienna@gmail.com>
Date: Sun, 30 Jan 2022 18:54:55 -0800
Subject: [PATCH 3/3] selecting a dedicated GPU if possible

---
 src/lve_device.cpp | 25 ++++++++++++++++++++++---
 src/lve_device.hpp |  3 ++-
 2 files changed, 24 insertions(+), 4 deletions(-)

diff --git a/src/lve_device.cpp b/src/lve_device.cpp
index 601e6f0..31ad6fd 100644
--- a/src/lve_device.cpp
+++ b/src/lve_device.cpp
@@ -119,7 +119,14 @@ void LveDevice::pickPhysicalDevice() {
   vkEnumeratePhysicalDevices(instance, &deviceCount, devices.data());
 
   for (const auto &device : devices) {
-    if (isDeviceSuitable(device)) {
+    if (isPreferredDevice(device)) {
+      physicalDevice = device;
+      return;
+    }
+  }
+
+  for (const auto &device : devices) {
+    if (isSuitableDevice(device)) {
       physicalDevice = device;
       break;
     }
@@ -195,7 +202,19 @@ void LveDevice::createCommandPool() {
 
 void LveDevice::createSurface() { window.createWindowSurface(instance, &surface_); }
 
-bool LveDevice::isDeviceSuitable(VkPhysicalDevice device) {
+bool LveDevice::isPreferredDevice(VkPhysicalDevice device) {
+  if (!isSuitableDevice(device))
+  {
+      return false;
+  }
+  
+  auto props = VkPhysicalDeviceProperties{};
+  vkGetPhysicalDeviceProperties(device, &props);
+  
+  return props.deviceType == VkPhysicalDeviceType::VK_PHYSICAL_DEVICE_TYPE_DISCRETE_GPU;
+}
+
+bool LveDevice::isSuitableDevice(VkPhysicalDevice device) {
   QueueFamilyIndices indices = findQueueFamilies(device);
 
   bool extensionsSupported = checkDeviceExtensionSupport(device);
@@ -530,4 +549,4 @@ void LveDevice::createImageWithInfo(
   }
 }
 
-}  // namespace lve
\ No newline at end of file
+}  // namespace lve
diff --git a/src/lve_device.hpp b/src/lve_device.hpp
index fd664b0..a7f4244 100644
--- a/src/lve_device.hpp
+++ b/src/lve_device.hpp
@@ -81,7 +81,8 @@ class LveDevice {
   void createCommandPool();
 
   // helper functions
-  bool isDeviceSuitable(VkPhysicalDevice device);
+  bool isSuitableDevice(VkPhysicalDevice device);
+  bool isPreferredDevice(VkPhysicalDevice device);
   std::vector<const char *> getRequiredExtensions();
   bool checkValidationLayerSupport();
   QueueFamilyIndices findQueueFamilies(VkPhysicalDevice device);