From ccf714a691a95be84ba168a725b6f0187bb903ea Mon Sep 17 00:00:00 2001
From: Joe Crayne <joe@jerkface.net>
Date: Sun, 19 May 2019 16:50:34 -0400
Subject: Made ringCapacity give vertex-count rather than float-count.

---
 PointPrimitiveRing.hs | 23 ++++++++++++++---------
 1 file changed, 14 insertions(+), 9 deletions(-)

(limited to 'PointPrimitiveRing.hs')

diff --git a/PointPrimitiveRing.hs b/PointPrimitiveRing.hs
index acca3ec..f55e08e 100644
--- a/PointPrimitiveRing.hs
+++ b/PointPrimitiveRing.hs
@@ -2,10 +2,13 @@
 module PointPrimitiveRing where
 
 import Control.Monad
+import Data.Data
 import Data.Foldable
+import Data.Function
 import Data.Int
 import Data.IORef
 import Data.Maybe
+import Data.Some
 import Data.Word
 import qualified Data.Map.Strict as Map
 import qualified Data.Vector as V
@@ -32,9 +35,9 @@ data Ring = Ring
     { rBufferObject :: Buffer
     , rStorage      :: GLStorage
     , rObject       :: Object
-    , rSize         :: IORef Int -- Current count of Floats in the ring buffer.
-    , rBack         :: IORef Int -- Where next vector will be added.
-    , ringCapacity  :: CPtrdiff  -- Maximum number of floats in buffer.
+    , rSize         :: IORef Int -- Current count of vertices in the ring buffer.
+    , rBack         :: IORef Int -- Where next vertex will be added.
+    , ringCapacity  :: Int       -- Maximum number of vertices in buffer.
     , rPosition     :: AttributeKey (GLVector 3 Float)
     }
 
@@ -54,7 +57,7 @@ newRing storage sz = do
             , rObject       = obj
             , rSize         = sizeRef
             , rBack         = startRef
-            , ringCapacity  = 3 * fromIntegral sz
+            , ringCapacity  = sz
             , rPosition     = k
             }
     updateRingCommands r
@@ -65,9 +68,11 @@ updateRingCommands r = do
     back <- fromIntegral <$> readIORef (rBack r)
     size  <- fromIntegral <$> readIORef (rSize r)
     let mask 0   = []
-        mask cnt = case cnt + back - size of
-            front | front > cnt -> [(front - cnt,size)]
-                  | otherwise   -> [(0,back), (front,cnt - front)]
+        mask cnt
+            | cnt==size = [(0,cnt)]
+            | otherwise = case cnt + back - size of
+                front | front > cnt -> [(front - cnt,size)]
+                      | otherwise   -> [(0,back), (front,cnt - front)]
     updateCommands (rStorage r) (rObject r) mask
     readIORef (objCommands $ rObject r) >>= mapM_ print
     return ()
@@ -75,12 +80,12 @@ updateRingCommands r = do
 pushBack :: Ring -> Float -> Float -> Float -> IO ()
 pushBack r x y z = do
     back <- readIORef $ rBack r
-    writeIORef (rBack r) (mod (back + 1) (fromIntegral $ ringCapacity r `div` 3))
+    writeIORef (rBack r) (mod (back + 1) (ringCapacity r))
     updateAttributes back $ do
         rPosition r @<- V3 x y z -- (fromList [x,y,z] :: Vector Float)
     sz <- readIORef (rSize r)
     putStrLn $ "pushBack "++show (sz,back,(x,y,z))
-    when (sz < fromIntegral (ringCapacity r `div` 3)) $ do
+    when (sz < ringCapacity r) $ do
         writeIORef (rSize r) (sz + 1)
     updateRingCommands r
 
-- 
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