From 4c2b2f13e5e726a2f6a3977ec36271cf10d34df1 Mon Sep 17 00:00:00 2001
From: Joshua Groves <josh@joshgroves.com>
Date: Sun, 17 Jun 2018 21:06:08 -0600
Subject: [PATCH] Check API version

---
 libportability-gfx/src/impls.rs | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/libportability-gfx/src/impls.rs b/libportability-gfx/src/impls.rs
index 05c3d63..bba2153 100644
--- a/libportability-gfx/src/impls.rs
+++ b/libportability-gfx/src/impls.rs
@@ -55,6 +55,18 @@ pub extern "C" fn gfxCreateInstance(
     unsafe {
         let create_info = &*pCreateInfo;
 
+        let application_info = create_info.pApplicationInfo.as_ref();
+
+        if let Some(ai) = application_info {
+            // Compare major and minor parts of version only - patch is ignored
+            let (supported_major, supported_minor, _)  = VERSION;
+            let requested_major_minor = ai.apiVersion >> 12;
+            let version_supported = requested_major_minor & (supported_major << 10 | supported_minor) == requested_major_minor;
+            if !version_supported {
+                return VkResult::VK_ERROR_INCOMPATIBLE_DRIVER;
+            }
+        }
+
         let enabled_extensions = if create_info.enabledExtensionCount == 0 {
             Vec::new()
         } else {