From dc837f71978da564f8945678e400b6551b6bd6af Mon Sep 17 00:00:00 2001
From: Mark Poliakov <mark@alnyan.me>
Date: Tue, 5 Jul 2022 21:13:58 +0300
Subject: [PATCH] Fix flipped Y-axis in viewport

---
 src/render/context.rs | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/src/render/context.rs b/src/render/context.rs
index 595bffa..30fc5a6 100644
--- a/src/render/context.rs
+++ b/src/render/context.rs
@@ -51,6 +51,7 @@ impl VulkanContext {
         let required_extensions = vulkano_win::required_extensions();
         let device_extensions = DeviceExtensions {
             khr_swapchain: true,
+            khr_maintenance1: true,     // Required for flipping Y-axis on viewport
             ..DeviceExtensions::none()
         };
 
@@ -119,8 +120,8 @@ impl VulkanContext {
         let framebuffers = Self::create_framebuffers(&swapchain_images, render_pass.clone())?;
 
         let viewport = Viewport {
-            origin: [0.0, 0.0],
-            dimensions: dim.into(),
+            origin: [0.0, dim.height as f32],
+            dimensions: [dim.width as f32, -(dim.height as f32)],
             depth_range: 0.0..1.0,
         };
 
@@ -236,7 +237,10 @@ impl VulkanContext {
 
     fn recreate_swapchain(&mut self) -> Result<(f32, f32), EngineError> {
         let dim = self.surface.window().inner_size();
-        self.viewport.dimensions = dim.into();
+
+        self.viewport.origin[1] = dim.height as f32;
+        self.viewport.dimensions[0] = dim.width as f32;
+        self.viewport.dimensions[1] = -(dim.height as f32);
 
         let (new_swapchain, new_images) = match self.swapchain.recreate(SwapchainCreateInfo {
             image_extent: dim.into(),