diff --git a/src/filters/interframe.cpp b/src/filters/interframe.cpp
index 6243db21..f79607ea 100644
--- a/src/filters/interframe.cpp
+++ b/src/filters/interframe.cpp
@@ -2,6 +2,8 @@
 #include <stdlib.h>
 #include <memory.h>
 
+#include "interframe.hpp"
+
 #ifdef MMX
 extern "C" bool cpu_mmx;
 #endif
@@ -16,7 +18,6 @@ static u8 *frm1 = NULL;
 static u8 *frm2 = NULL;
 static u8 *frm3 = NULL;
 
-extern int RGB_LOW_BITS_MASK;
 extern u32 qRGB_COLOR_MASK[2];
 
 static void Init()
diff --git a/src/filters/interframe.hpp b/src/filters/interframe.hpp
new file mode 100644
index 00000000..a0142c3e
--- /dev/null
+++ b/src/filters/interframe.hpp
@@ -0,0 +1,31 @@
+/// Interframe blending filters
+
+#ifndef INTERFRAME_HPP
+#define INTERFRAME_HPP
+
+extern int RGB_LOW_BITS_MASK;
+
+static void Init();
+
+// call ifc to ignore previous frame / when starting new
+void InterframeCleanup();
+
+// all 4 are MMX-accelerated if enabled
+void SmartIB(u8 *srcPtr, u32 srcPitch, int width, int starty, int height);
+void SmartIB32(u8 *srcPtr, u32 srcPitch, int width, int starty, int height);
+void MotionBlurIB(u8 *srcPtr, u32 srcPitch, int width, int starty, int height);
+void MotionBlurIB32(u8 *srcPtr, u32 srcPitch, int width, int starty, int height);
+
+#ifdef MMX
+static void SmartIB_MMX(u8 *srcPtr, u32 srcPitch, int width, int starty, int height);
+static void SmartIB32_MMX(u8 *srcPtr, u32 srcPitch, int width, int starty, int height);
+static void MotionBlurIB_MMX(u8 *srcPtr, u32 srcPitch, int width, int starty, int height);
+static void MotionBlurIB32_MMX(u8 *srcPtr, u32 srcPitch, int width, int starty, int height);
+#endif
+
+//Options for if starty is 0
+void SmartIB(u8 *srcPtr, u32 srcPitch, int width, int height);
+void SmartIB32(u8 *srcPtr, u32 srcPitch, int width, int height);
+void MotionBlurIB(u8 *srcPtr, u32 srcPitch, int width, int height);
+void MotionBlurIB32(u8 *srcPtr, u32 srcPitch, int width, int height);
+#endif  //INTERFRAME_HPP
diff --git a/src/gtk/filters.cpp b/src/gtk/filters.cpp
index fae36529..dca99caf 100644
--- a/src/gtk/filters.cpp
+++ b/src/gtk/filters.cpp
@@ -18,6 +18,7 @@
 
 #include "filters.h"
 #include "intl.h"
+#include "../filters/interframe.hpp"
 
 void _2xSaI        (u8 *, u32, u8 *, u8 *, u32, int, int);
 void _2xSaI32      (u8 *, u32, u8 *, u8 *, u32, int, int);
@@ -42,11 +43,6 @@ void hq2x32        (u8 *, u32, u8 *, u8 *, u32, int, int);
 void lq2x          (u8 *, u32, u8 *, u8 *, u32, int, int);
 void lq2x32        (u8 *, u32, u8 *, u8 *, u32, int, int);
 
-void SmartIB       (u8 *, u32, int, int);
-void SmartIB32     (u8 *, u32, int, int);
-void MotionBlurIB  (u8 *, u32, int, int);
-void MotionBlurIB32(u8 *, u32, int, int);
-
 namespace VBA
 {
 
diff --git a/src/sdl/filters.cpp b/src/sdl/filters.cpp
index 503f8b0a..c39aa02e 100644
--- a/src/sdl/filters.cpp
+++ b/src/sdl/filters.cpp
@@ -18,6 +18,8 @@
 
 #include "filters.h"
 
+#include "../filters/interframe.hpp"
+
       //
       // Screen filters
       //
@@ -147,15 +149,6 @@ FilterFunc initFilter(const Filter f, const int colorDepth, const int srcWidth)
   return func;
 }
 
-      //
-      // Interframe blending filters
-      //
-
-extern void SmartIB(u8*,u32,int,int);
-extern void SmartIB32(u8*,u32,int,int);
-extern void MotionBlurIB(u8*,u32,int,int);
-extern void MotionBlurIB32(u8*,u32,int,int);
-
 struct IFBFilterDesc {
 	char name[30];
 	IFBFilterFunc func16;
diff --git a/src/win32/VBA.cpp b/src/win32/VBA.cpp
index 0977987e..329b4d5c 100644
--- a/src/win32/VBA.cpp
+++ b/src/win32/VBA.cpp
@@ -38,6 +38,8 @@
 
 #include "../version.h"
 
+#include "../filters/interframe.hpp"
+
 /* Link
 ---------------------*/
 #include "../gba/GBALink.h"
@@ -78,11 +80,6 @@ extern void hq3x32(u8*,u32,u8*,u8*,u32,int,int);
 extern void hq4x32(u8*,u32,u8*,u8*,u32,int,int);
 #endif
 
-extern void SmartIB(u8*,u32,int,int);
-extern void SmartIB32(u8*,u32,int,int);
-extern void MotionBlurIB(u8*,u32,int,int);
-extern void MotionBlurIB32(u8*,u32,int,int);
-
 extern IDisplay *newGDIDisplay();
 extern IDisplay *newDirectDrawDisplay();
 #ifndef NO_OGL
diff --git a/src/wx/filters.h b/src/wx/filters.h
index fe8bd5d8..8f8405fc 100644
--- a/src/wx/filters.h
+++ b/src/wx/filters.h
@@ -6,6 +6,10 @@
 // most 16-bit filters require space in src rounded up to u32
 // those that take delta take 1 src line of pixels, rounded up to u32 size
 // initial value appears to be all-0xff
+
+#include "../filters/interframe.hpp"
+
+
 void Pixelate32(u8 *src, u32 spitch, u8 *, u8 *dst, u32 dstp, int w, int h);
 void Pixelate(u8 *src, u32 spitch, u8 *delta, u8 *dst, u32 dstp, int w, int h);
 // next 3*2 use Init_2xSaI(555|565) and do not take into account
@@ -62,16 +66,4 @@ void hq4x32(u8 *src, u32 spitch, u8 *, u8 *dst, u32 dstp, int w, int h);
 void hq4x32_32(u8 *src, u32 spitch, u8 *, u8 *dst, u32 dstp, int w, int h);
 void hq4x16(u8 *src, u32 spitch, u8 *, u8 *dst, u32 dstp, int w, int h);
 
-// call ifc to ignore previous frame / when starting new
-void InterframeCleanup();
-// all 4 are MMX-accelerated if enabled
-void SmartIB(u8 *src, u32 spitch, int width, int height);
-void SmartIB32(u8 *src, u32 spitch, int width, int height);
-void MotionBlurIB(u8 *src, u32 spitch, int width, int height);
-void MotionBlurIB32(u8 *src, u32 spitch, int width, int height);
-void SmartIB(u8 *src, u32 spitch, int width, int starty, int height);
-void SmartIB32(u8 *src, u32 spitch, int width, int starty, int height);
-void MotionBlurIB(u8 *src, u32 spitch, int width, int starty, int height);
-void MotionBlurIB32(u8 *src, u32 spitch, int width, int starty, int height);
-
 #endif /* FILTERS_H */