Added call to gl_clearwin() for filter modes [zinx]

zsnes/src/linux/gl_draw.c

@@ -34,6 +34,8 @@ extern Uint8 GUIOn2;
 
 extern unsigned int vidbuffer;
 
+void gl_clearwin();
+
 int gl_start(int width, int height, int req_depth, int FullScreen)
 {
 	Uint32 flags =
@@ -55,6 +57,7 @@ int gl_start(int width, int height, int req_depth, int FullScreen)
 		return FALSE;
 	}
 
+	gl_clearwin();
 	SurfaceLocking = SDL_MUSTLOCK(surface);
 	SDL_WarpMouse(SurfaceX / 4, SurfaceY / 4);
 

zsnes/src/linux/sdllink.c

@@ -89,6 +89,10 @@ void initwinvideo();
 void ProcessKeyBuf(int scancode);
 void LinuxExit(void);
 
+#ifdef __OPENGL__
+extern void gl_clearwin();
+#endif
+
 int Main_Proc(void)
 {
 	int j;
@@ -254,6 +258,7 @@ int Main_Proc(void)
 				    WindowHeight, BitDepth, surface->flags);
 				glViewport(0,0, WindowWidth, WindowHeight);
 				glFlush();
+				gl_clearwin();
 				break;
 #endif
 			default: