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/* extern for video.c */
FRAMEBUFFER *pFrameBuffer;    /* Pointer into current 'FrameBuffer' */
static FRAMEBUFFER FrameBuffers[NUM_FRAMEBUFFERS]; /* Store frame buffer details to tell how to update */

memset(FrameBuffers, 0, NUM_FRAMEBUFFERS * sizeof(FRAMEBUFFER));

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#define HBL_PALETTE_LINES ((NUM_VISIBLE_LINES+1)*16)
/* Bit mask of palette colours changes, top bit set is resolution change */
#define HBL_PALETTE_MASKS (NUM_VISIBLE_LINES+1)


/* Frame buffer, used to store details in screen conversion */
typedef struct
{
  Uint16 HBLPalettes[HBL_PALETTE_LINES];
  Uint32 HBLPaletteMasks[HBL_PALETTE_MASKS];
  Uint8 *pSTScreen;             /* Copy of screen built up during frame (copy each line on HBL to simulate monitor raster) */
  Uint8 *pSTScreenCopy;         /* Previous frames copy of above  */
  int OverscanModeCopy;         /* Previous screen overscan mode */
  bool bFullUpdate;             /* Set TRUE to cause full update on next draw */
} FRAMEBUFFER;

/* Number of frame buffers (1 or 2) - should be 2 for supporting screen flipping */
#define NUM_FRAMEBUFFERS  2