added fix for lower fps speed on windows

src/win/pxTimerNative.cpp

@@ -18,11 +18,7 @@ limitations under the License.
 
 // pxTimerNative.cpp
 
-#include <windows.h>
-#include <stdint.h>
-
-static bool gFreqInitialized = false;
-static LARGE_INTEGER gFreq;
+#include "pxTimerNative.h"
 
 double pxSeconds()
 {

src/win/pxTimerNative.h

@@ -0,0 +1,32 @@
+/*
+
+pxCore Copyright 2005-2018 John Robinson
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+
+*/
+
+// pxTimerNative.h
+
+#include <windows.h>
+#include <stdint.h>
+
+static bool gFreqInitialized = false;
+static LARGE_INTEGER gFreq;
+
+double pxSeconds();
+
+double pxMilliseconds();
+
+double pxMicroseconds();
+void pxSleepMS(uint32_t sleepMS);

src/win/pxWindowNative.cpp

@@ -25,6 +25,7 @@ limitations under the License.
 #include "../pxWindowUtil.h"
 
 #include "../pxKeycodes.h"
+#include "pxTimerNative.h"
 
 #ifndef WINCE
 #include <tchar.h>
@@ -159,6 +160,7 @@ void pxWindow::setVisibility(bool visible)
     ShowWindow(mWindow, visible?SW_SHOW:SW_HIDE);
 }
 
+static int sFPS = 0;
 pxError pxWindow::setAnimationFPS(uint32_t fps)
 {
 #if 0
@@ -171,6 +173,8 @@ pxError pxWindow::setAnimationFPS(uint32_t fps)
     if (fps > 0)
     {
         mTimerId = SetTimer(mWindow, 1, 1000/fps, NULL);
+
+        sFPS = fps;
     }
     return PX_OK;
 #else
@@ -281,7 +285,8 @@ LRESULT __stdcall pxWindowNative::windowProc(HWND hWnd, UINT msg, WPARAM wParam,
 		}
 
 		// re resolve the window ptr since we have destroyed it
-
+
+        double startT = 0;
         w = (pxWindowNative*)getWindowPtr(hWnd);
 		if (w)
 		{
@@ -410,8 +415,10 @@ LRESULT __stdcall pxWindowNative::windowProc(HWND hWnd, UINT msg, WPARAM wParam,
 #endif
 
         case WM_TIMER:
-			// Should filter this to a single id
+            // Should filter this to a single id
+            startT = pxSeconds();
             w->onAnimationTimer();
+            w->mTimerId = SetTimer(w->mWindow, 1, (1000 / sFPS) - (pxSeconds() - startT), NULL);
             break;
 
         case WM_KEYDOWN: