1 files changed, 28 insertions, 49 deletions

diff --git a/src/lua/embed/boot.lua.h b/src/lua/embed/boot.lua.h
index c1d22a3..da1feac 100644
--- a/src/lua/embed/boot.lua.h
+++ b/src/lua/embed/boot.lua.h
@@ -26,6 +26,12 @@ if jin._argv[3] == '-d' then
     jin.debug.init()
 end
 
+local function safecall(func, ...)
+    if func then 
+        func(...)
+    end
+end 
+
 function jin.core.run()
     local load     = jin.core.load
     local running  = jin.core.running
@@ -41,74 +47,47 @@ function jin.core.run()
     local onEvent  = jin.core.onEvent
     local present  = jin.graphics.present
     local setkey   = jin.keyboard.set
-
     local dstatus  = jin.debug.status   
     local drender  = jin.debug.render
 
     local fps      = conf.fps
 
-    local _onEvent = function (e) 
-        if e.type == "keydown" then 
-            setkey(e.key, true) 
-        elseif e.type == "keyup" then 
-            setkey(e.key, false)
-        end 
-        if onEvent then 
-            onEvent(e) 
-        end
-    end 
-
-    if load then 
-        load()
-    end
-
-    local now = second()
-    local last = now
-    local fsec = 1/fps
-    local dt = 0
-
+    safecall(load)
+    local previous = second()
+    local SEC_PER_UPDATE = 1 / fps
+    local dt = SEC_PER_UPDATE
     while(running()) do
-        -- frame controle
-        last = now
-        now = second()
-        dt = now - last
-        if dt < fsec then 
-            sleep(fsec - dt)
-            dt = fsec
-        end
-
-        -- handle events
         for _, e in pairs(poll()) do 
-            if _onEvent then
-                _onEvent(e)
+            if e.type == "keydown" then 
+                setkey(e.key, true) 
+            elseif e.type == "keyup" then 
+                setkey(e.key, false)
             end
+            safecall(onEvent, e)
         end
-
-        -- update
-        if onUpdate then
-        --    while do 
-                onUpdate(dt)
-        --    end 
-        end
-        
+        safecall(onUpdate, dt)
         -- bind to default render buffer 
         unbind() 
         clear() 
         color()
         study()
-
-        -- custom drawing
-        if onDraw then 
-            onDraw()
-        end
-        
+        safecall(onDraw)
         -- render debug window
         if dstatus() then 
             drender()
         end
-
-        -- swap window buffer 
         present()
+        -- frame control
+        local current = second() 
+        dt = current - previous
+        local wait = SEC_PER_UPDATE - dt
+        previous = previous + SEC_PER_UPDATE 
+        if wait > 0 then 
+            sleep(wait)
+            dt = SEC_PER_UPDATE
+        else 
+            previous = current
+        end
     end
 end