gfxlib2: add driver->update() member

- adds a new member to GFXDRIVER to allow (in future) updating of the
  video memory from fbgfx's graphics buffer explicitly with the intention
  of overriding the automatic / background updating of video memory.
- a fairly safe internal change since only the GFXDRIVER is extended and
  should remain binary compatible when linking
- usage of the new member will be made in a later future update and will
  require new flags passed to SCREEN/SCREENRES to modify behaviour and
  access during run-time

Author: jayrm

src/gfxlib2/dos/gfx_driver_bios.c

@@ -30,7 +30,8 @@ const GFXDRIVER fb_gfxDriverBIOS =
 	NULL,                    /* int (*set_window_pos)(int x, int y); */
 	driver_fetch_modes,      /* int *(*fetch_modes)(int depth, int *size); */
 	NULL,                    /* void (*flip)(void); */
-	NULL                     /* void (*poll_events)(void); */
+	NULL,                    /* void (*poll_events)(void); */
+	NULL                     /* void (*update)(void); */
 };
 
 static const int res_bpp1[] = {

src/gfxlib2/dos/gfx_driver_modex.c

@@ -31,7 +31,8 @@ const GFXDRIVER fb_gfxDriverModeX =
 	NULL,                    /* int (*set_window_pos)(int x, int y); */
 	driver_fetch_modes,      /* int *(*fetch_modes)(int depth, int *size); */	
 	NULL,                    /* void (*flip)(void); */
-	NULL                     /* void (*poll_events)(void); */
+	NULL,                    /* void (*poll_events)(void); */
+	NULL                     /* void (*update)(void); */
 };
 
 static int modes[] = {

src/gfxlib2/dos/gfx_driver_vesa_bnk.c

@@ -28,7 +28,8 @@ const GFXDRIVER fb_gfxDriverVESA =
 	NULL,                    /* int (*set_window_pos)(int x, int y); */
 	fb_dos_vesa_fetch_modes, /* int *(*fetch_modes)(int depth, int *size); */
 	NULL,                    /* void (*flip)(void); */
-	NULL                     /* void (*poll_events)(void); */
+	NULL,                    /* void (*poll_events)(void); */
+	NULL                     /* void (*update)(void); */
 };
 
 static int data_locked = FALSE;

src/gfxlib2/dos/gfx_driver_vesa_lin.c

@@ -27,7 +27,8 @@ const GFXDRIVER fb_gfxDriverVESAlinear =
 	NULL,                    /* int (*set_window_pos)(int x, int y); */
 	fb_dos_vesa_fetch_modes, /* int *(*fetch_modes)(int depth, int *size); */
 	NULL,                    /* void (*flip)(void); */
-	NULL                     /* void (*poll_events)(void); */
+	NULL,                    /* void (*poll_events)(void); */
+	NULL                     /* void (*update)(void); */
 };
 
 static __dpmi_meminfo mapping = {0};

src/gfxlib2/dos/gfx_driver_vga.c

@@ -26,7 +26,8 @@ const GFXDRIVER fb_gfxDriverVGA =
 	NULL,                    /* int (*set_window_pos)(int x, int y); */
 	driver_fetch_modes,      /* int *(*fetch_modes)(int depth, int *size); */	
 	NULL,                    /* void (*flip)(void); */
-	NULL                     /* void (*poll_events)(void); */
+	NULL,                    /* void (*poll_events)(void); */
+	NULL                     /* void (*update)(void); */
 };
 
 static int modes[] = {

src/gfxlib2/fb_gfx.h

@@ -347,6 +347,12 @@ typedef struct GFXDRIVER
 	 * It is only needed for OpenGL drivers and can be NULL otherwise.
 	 */
 	void (*poll_events)(void);
+
+	/** Driver page update function pointer.
+	 *
+	 * Manually refresh the screen by copying from gfxlib2 memory to video memory
+	 */
+	void (*update)(void);
 } GFXDRIVER;
 
 typedef struct PALETTE

src/gfxlib2/gfx_driver_null.c

@@ -20,7 +20,8 @@ const GFXDRIVER __fb_gfxDriverNull =
 	NULL,           /* int (*set_window_pos)(int x, int y); */
 	NULL,           /* int *(*fetch_modes)(int depth, int *size); */
 	NULL,           /* void (*flip)(void); */
-	NULL            /* void (*poll_events)(void); */
+	NULL,           /* void (*poll_events)(void); */
+	NULL            /* void (*update)(void); */
 };
 
 static void driver_dummy(void)

src/gfxlib2/js/gfx_driver.c

@@ -275,7 +275,8 @@ static const GFXDRIVER fb_gfxDriverJS =
 	NULL,                    /* int (*set_window_pos)(int x, int y); */
 	driver_fetch_modes,      /* int *(*fetch_modes)(int depth, int *size); */
 	NULL,                    /* void (*flip)(void); */
-	driver_poll_events       /* void (*poll_events)(void); */
+	driver_poll_events,      /* void (*poll_events)(void); */
+	NULL                     /* void (*update)(void); */
 };
 
 /* GFXDRIVER */
@@ -294,7 +295,8 @@ static const GFXDRIVER fb_gfxWebGL =
 	NULL,                    /* int (*set_window_pos)(int x, int y); */
 	driver_fetch_modes,      /* int *(*fetch_modes)(int depth, int *size); */
 	WGL_Flip,                /* void (*flip)(void); */
-	driver_poll_events       /* void (*poll_events)(void); */
+	driver_poll_events,      /* void (*poll_events)(void); */
+	NULL                     /* void (*update)(void); */
 };
 
 const GFXDRIVER *__fb_gfx_drivers_list[] = {

src/gfxlib2/linux/gfx_driver_fbdev.c

@@ -58,7 +58,8 @@ const GFXDRIVER fb_gfxDriverFBDev =
 	NULL,               /* int (*set_window_pos)(int x, int y); */
 	driver_fetch_modes, /* int *(*fetch_modes)(void); */
 	NULL,               /* void (*flip)(void); */
-	NULL                /* void (*poll_events)(void); */
+	NULL,               /* void (*poll_events)(void); */
+	NULL                /* void (*update)(void); */
 };
 
 

src/gfxlib2/unix/gfx_driver_opengl_x11.c

@@ -36,7 +36,8 @@ const GFXDRIVER fb_gfxDriverOpenGL =
 	fb_hX11SetWindowPos,    /* int (*set_window_pos)(int x, int y); */
 	fb_hX11FetchModes,      /* int *(*fetch_modes)(void); */
 	driver_flip,            /* void (*flip)(void); */
-	NULL                    /* void (*poll_events)(void); */
+	NULL,                   /* void (*poll_events)(void); */
+	NULL                    /* void (*update)(void); */
 };