Unified screen update code of all Voodoo models and prepared Voodoo 1/2 for

tile-based updates and screen update locking. Some related changes in the init
and save/restore code are also included. The main update code has been moved
from bx_voodoo_vga_c to bx_voodoo_c and the required parameters are set up
depending on the model. The BX_LOCK/BX_UNLOCK and SET_TILE_UPDATED stuff still
needs to be added in the 3D core. Currently a redraw_area() hack makes the
Voodoo 1/2 screen updates work as expected.

bochs/iodev/display/voodoo.h

@@ -46,6 +46,11 @@ typedef struct {
   int mode_change_timer_id;
   int vertical_timer_id;
   Bit8u devfunc;
+  Bit16u max_xres;
+  Bit16u max_yres;
+  Bit16u num_x_tiles;
+  Bit16u num_y_tiles;
+  bx_bool  *vga_tile_updated;
 } bx_voodoo_t;
 
 
@@ -71,6 +76,9 @@ public:
   static bx_bool update_timing(void);
   Bit8u get_model(void) {return s.model;}
 
+  void banshee_draw_hwcursor(unsigned xc, unsigned yc, bx_svga_tileinfo_t *info);
+  void set_tile_updated(unsigned xti, unsigned yti, bx_bool flag);
+
   Bit32u banshee_blt_reg_read(Bit8u reg);
   void   banshee_blt_reg_write(Bit8u reg, Bit32u value);
 
@@ -127,18 +135,11 @@ public:
   void banshee_update_mode(void);
   void banshee_set_dac_mode(bx_bool mode);
   void banshee_set_vclk3(Bit32u value);
-  void banshee_draw_hwcursor(unsigned xc, unsigned yc, bx_svga_tileinfo_t *info);
 
   static Bit32u banshee_vga_read_handler(void *this_ptr, Bit32u address, unsigned io_len);
   static void   banshee_vga_write_handler(void *this_ptr, Bit32u address, Bit32u value, unsigned io_len);
 
 protected:
   virtual void  update(void);
-
-private:
-  struct {
-    bx_bool dac_8bit;
-    bx_bool half_mode;
-  } vbe;
 };
 #endif

bochs/iodev/display/voodoo_data.h

@@ -1721,7 +1721,9 @@ struct _banshee_info
   Bit32u io[0x40];   /* I/O registers */
   Bit32u agp[0x80];  /* AGP registers */
   Bit8u  crtc[0x27]; /* VGA CRTC registers */
-  Bit8u  bpp;
+  Bit8u  disp_bpp;
+  bx_bool half_mode;
+  bx_bool dac_8bit;
   struct {
     bx_bool enabled;
     bx_bool mode;