fixed MappedBuffer count initialization;

added GL.Check to RenderTask.Run;
removed obsolete SupressRuntimeStats switch;

src/Aardvark.Rendering.GL/Core/Config.fs

@@ -80,9 +80,6 @@ module RuntimeConfig =
     /// If true, no OpenGL queries take place, i.e. no primitive counting etc.
     let mutable SupressGLTimers = false
 
-    /// If true, no frame statistics is accumulated for render tasks 
-    let mutable SupressRuntimeStats = false
-
     let mutable SupressSparseBuffers = false
 
 [<AutoOpen>]

src/Aardvark.Rendering.GL/Resources/MappedBuffer.fs

@@ -460,9 +460,14 @@ type MappedIndirectBuffer(ctx : Context, indexed : bool) =
     static let sd = sizeof<DrawCallInfo> |> nativeint
     let buffer = ctx.CreateMappedBuffer()
 
-    let mutable capacity = 0
-    let count : nativeptr<int> = NativePtr.alloc 1
+    let createCount() =
+        let ptr = NativePtr.alloc 1
+        NativePtr.write ptr 0
+        ptr
 
+    let mutable capacity = 0
+    let count : nativeptr<int> = createCount()
+
     let convert =
         if indexed then
             fun (info : DrawCallInfo) ->

src/Aardvark.Rendering.GL/Runtime/RenderTasks.fs

@@ -184,7 +184,7 @@ module RenderTasks =
                 beforeRender.OnNext()
                 NativePtr.write runtimeStats V2i.Zero
                 let stats = x.Perform(t, fbo)
-
+                GL.Check "RenderTask.Run"
                 afterRender.OnNext()
                 let rt = NativePtr.read runtimeStats
                 t.AddDrawCalls(rt.X, rt.Y)