ctx - max sample usage

oatmeal/src/ctx.h

@@ -87,5 +87,7 @@ namespace Oatmeal {
         void pickPhysicalDevice();
         bool isPhysicalDeviceSupported(vk::raii::PhysicalDevice device);
         uint32_t scorePhysicalDevice(vk::raii::PhysicalDevice device);
+        vk::SampleCountFlagBits getMaxUsableSampleCount();
+        void createLogicalDevice();
     };
 } // namespace Oatmeal

oatmeal/src/ctx_attachments.cpp

@@ -0,0 +1,27 @@
+#include "ctx.h"
+#include "vulkan/vulkan.hpp"
+
+namespace Oatmeal {
+
+    vk::SampleCountFlagBits ctx::getMaxUsableSampleCount() {
+        vk::PhysicalDeviceProperties physicalDeviceProperties = m_physicalDevice.getProperties();
+
+        vk::SampleCountFlags count = physicalDeviceProperties.limits.framebufferColorSampleCounts &
+                                     physicalDeviceProperties.limits.framebufferDepthSampleCounts;
+
+        if (count & vk::SampleCountFlagBits::e16) {
+            return vk::SampleCountFlagBits::e16;
+        }
+        if (count & vk::SampleCountFlagBits::e8) {
+            return vk::SampleCountFlagBits::e8;
+        }
+        if (count & vk::SampleCountFlagBits::e4) {
+            return vk::SampleCountFlagBits::e4;
+        }
+        if (count & vk::SampleCountFlagBits::e2) {
+            return vk::SampleCountFlagBits::e2;
+        }
+
+        return vk::SampleCountFlagBits::e1;
+    }
+} // namespace Oatmeal