// vid.h -- video driver defs

#define VID_CBITS	6
#define VID_GRADES	(1 << VID_CBITS)

// a pixel can be one, two, or four bytes
typedef byte pixel_t;

typedef struct vrect_s {
    int x, y, width, height;
    struct vrect_s *pnext;
} vrect_t;

typedef struct {
    pixel_t *buffer;		// invisible buffer
    pixel_t *colormap;		// 256 * VID_GRADES size
    unsigned short *colormap16;	// 256 * VID_GRADES size
    int fullbright;		// index of first fullbright color
    unsigned rowbytes;		// may be > width if displayed in a window
    unsigned width;
    unsigned height;
    float aspect;		// width / height -- < 0 is taller than wide
    int numpages;
    int recalc_refdef;		// if true, recalc vid-based stuff
    pixel_t *conbuffer;
    int conrowbytes;
    unsigned conwidth;
    unsigned conheight;
    int maxwarpwidth;
    int maxwarpheight;
    pixel_t *direct;		// direct drawing to framebuffer, if not
    //  NULL
} viddef_t;

extern viddef_t vid;		// global video state
extern unsigned short d_8to16table[256];
extern unsigned d_8to24table[256];
extern void (*vid_menudrawfn) (void);
extern void (*vid_menukeyfn) (int key);

void VID_SetPalette(unsigned char *palette);
// called at startup and after any gamma correction

void VID_ShiftPalette(unsigned char *palette);
// called for bonus and pain flashes, and for underwater color changes

void VID_Init(unsigned char *palette);
// Called at startup to set up translation tables, takes 256 8 bit RGB values
// the palette data will go away after the call, so it must be copied off if
// the video driver will need it again

void VID_Shutdown(void);
// Called at shutdown

void VID_Update(vrect_t * rects);
// flushes the given rectangles from the view buffer to the screen

int VID_SetMode(int modenum, unsigned char *palette);
// sets the mode; only used by the Quake engine for resetting to mode 0 (the
// base mode) on memory allocation failures
