flip y axis

src/CommandBuffer.hs

@@ -298,11 +298,12 @@ prepareRecording
 prepareRecording (V2 width height) commandBuffer graphicsPipeline = do
   Vk.cmdBindPipeline commandBuffer Vk.PIPELINE_BIND_POINT_GRAPHICS graphicsPipeline
 
+  -- Passing negative height and nonzero y origin to the viewport flips the models back in order
   let viewport = Vk.zero
         { Vk.x        = 0
-        , Vk.y        = 0
+        , Vk.y        = fromIntegral height
         , Vk.width    = fromIntegral width
-        , Vk.height   = fromIntegral height
+        , Vk.height   = - fromIntegral height
         , Vk.minDepth = 0
         , Vk.maxDepth = 1
         }

src/Draw.hs

@@ -57,7 +57,7 @@ drawFrame engineData frameNumber = do
   let (V2 width height) = engineWindowDimensions engineData
       camPosition = V3
         (-10 * sin (fromIntegral frameNumber / 90))
-        (-2)
+        2
         (-10 * cos (fromIntegral frameNumber / 90))
       camCenter = V3 0 0 0
       camUp = V3 0 1 0

src/Mesh.hs

@@ -16,8 +16,6 @@ import qualified Data.Map.Strict as M
 import Data.Maybe (fromMaybe)
 import qualified Data.Vector as V
 
-import Debug.Trace
-
 import Foreign
 
 import Linear (V2(..), V3(..), V4(..))
@@ -40,9 +38,9 @@ loadMeshes
   -> m ()
 loadMeshes allocator uploadContext queue device = do
   let triangle = V.fromList
-        [ Vertex (V3 0.5 0.5 0)    (V3 0 0 0) (V4 0 1 0 1) (V2 0 0)
+        [ Vertex (V3 0.5 0 0)    (V3 0 0 0) (V4 0 1 0 1) (V2 0 0)
-        , Vertex (V3 (-0.5) 0.5 0) (V3 0 0 0) (V4 0 1 0 1) (V2 0 0)
+        , Vertex (V3 (-0.5) 0 0) (V3 0 0 0) (V4 0 1 0 1) (V2 0 0)
-        , Vertex (V3 0 (-0.5) 0)   (V3 0 0 0) (V4 0 1 0 1) (V2 0 0)
+        , Vertex (V3 0 1 0)   (V3 0 0 0) (V4 0 1 0 1) (V2 0 0)
         ]
 
   triMesh <- uploadMesh triangle allocator uploadContext queue device