diff --git a/libctru/source/gfx.c b/libctru/source/gfx.c
index 6fa27fb..e8adbb3 100644
--- a/libctru/source/gfx.c
+++ b/libctru/source/gfx.c
@@ -16,6 +16,8 @@ u8* gfxSharedMemory;
 u8* gfxTopLeftFramebuffers[2];
 u8* gfxTopRightFramebuffers[2];
 u8* gfxBottomFramebuffers[2];
+u32 gfxTopFramebufferMaxSize;
+u32 gfxBottomFramebufferMaxSize;
 
 static bool enable3d;
 static u8 currentBuffer[2];
@@ -28,6 +30,9 @@ static GSPGPU_FramebufferFormats botFormat = GSP_BGR8_OES;
 
 static GSPGPU_FramebufferInfo* const framebufferInfoSt[] = { &topFramebufferInfo, &bottomFramebufferInfo };
 
+static void (*screenFree)(void *) = NULL;
+static void *(*screenAlloc)(size_t) = NULL;
+
 void gfxSet3D(bool enable)
 {
 	enable3d=enable;
@@ -38,39 +43,64 @@ bool gfxIs3D(void)
 	return enable3d;
 }
 
+u32 __get_bytes_per_pixel(GSPGPU_FramebufferFormats format) {
+	switch(format) {
+	case GSP_RGBA8_OES:
+		return 4;
+	case GSP_BGR8_OES:
+		return 3;
+	case GSP_RGB565_OES:
+	case GSP_RGB5_A1_OES:
+	case GSP_RGBA4_OES:
+		return 2;
+	}
+
+	return 3;
+}
+
 void gfxSetScreenFormat(gfxScreen_t screen, GSPGPU_FramebufferFormats format) {
-    if(screen==GFX_TOP)
-        topFormat = format;
-    else
-        botFormat = format;
+	if (screenAlloc == NULL || screenFree == NULL) return;
+	if(screen==GFX_TOP)
+	{
+		u32 topSize = 400 * 240 * __get_bytes_per_pixel(format);
+		if (gfxTopFramebufferMaxSize < topSize)
+		{
+			screenFree(gfxTopLeftFramebuffers[0]);
+			screenFree(gfxTopLeftFramebuffers[1]);
+			screenFree(gfxTopRightFramebuffers[0]);
+			screenFree(gfxTopRightFramebuffers[1]);
+			gfxTopLeftFramebuffers[0]=screenAlloc(topSize);
+			gfxTopLeftFramebuffers[1]=screenAlloc(topSize);
+			gfxTopRightFramebuffers[0]=screenAlloc(topSize);
+			gfxTopRightFramebuffers[1]=screenAlloc(topSize);
+			gfxTopFramebufferMaxSize = topSize;
+		}
+		topFormat = format;
+	}else{
+		u32 bottomSize = 320 * 240 * __get_bytes_per_pixel(format);
+		if (gfxBottomFramebufferMaxSize < bottomSize)
+		{
+			screenFree(gfxBottomFramebuffers[0]);
+			screenFree(gfxBottomFramebuffers[1]);
+			gfxBottomFramebuffers[0]=screenAlloc(bottomSize);
+			gfxBottomFramebuffers[1]=screenAlloc(bottomSize);
+			gfxBottomFramebufferMaxSize = bottomSize;
+		}
+		botFormat = format;
+	}
 }
 
 GSPGPU_FramebufferFormats gfxGetScreenFormat(gfxScreen_t screen) {
-    if(screen==GFX_TOP)
-        return topFormat;
-    else
-        return botFormat;
+	if(screen==GFX_TOP)
+		return topFormat;
+	else
+		return botFormat;
 }
 
 void gfxSetDoubleBuffering(gfxScreen_t screen, bool doubleBuffering) {
 	doubleBuf[screen] = doubleBuffering ? 1 : 0; // make sure they're the integer values '1' and '0'
 }
 
-u32 __get_bytes_per_pixel(GSPGPU_FramebufferFormats format) {
-    switch(format) {
-    case GSP_RGBA8_OES:
-        return 4;
-    case GSP_BGR8_OES:
-        return 3;
-    case GSP_RGB565_OES:
-    case GSP_RGB5_A1_OES:
-    case GSP_RGBA4_OES:
-        return 2;
-    }
-
-    return 3;
-}
-
 void gfxSetFramebufferInfo(gfxScreen_t screen, u8 id)
 {
 	if(screen==GFX_TOP)
@@ -105,12 +135,8 @@ void gfxWriteFramebufferInfo(gfxScreen_t screen)
 	framebufferInfoHeader[0x1]=1;
 }
 
-static void (*screenFree)(void *) = NULL;
-
 void gfxInit(GSPGPU_FramebufferFormats topFormat, GSPGPU_FramebufferFormats bottomFormat, bool vrambuffers)
 {
-	void *(*screenAlloc)(size_t);
-
 	if (vrambuffers)
 	{
 		screenAlloc=vramAlloc;
@@ -150,6 +176,8 @@ void gfxInit(GSPGPU_FramebufferFormats topFormat, GSPGPU_FramebufferFormats bott
 	gfxBottomFramebuffers[1]=screenAlloc(bottomSize);
 	gfxTopRightFramebuffers[0]=screenAlloc(topSize);
 	gfxTopRightFramebuffers[1]=screenAlloc(topSize);
+	gfxTopFramebufferMaxSize = topSize;
+	gfxBottomFramebufferMaxSize = bottomSize;
 
 	enable3d=false;