fix win32 GL_NV_register_combiners build stuff (d1x r1.39, r1.7)

[btb/d2x.git] / include / gr.h

/* $Id: gr.h,v 1.27 2004-05-22 09:21:22 btb Exp $ */
/*
THE COMPUTER CODE CONTAINED HEREIN IS THE SOLE PROPERTY OF PARALLAX
SOFTWARE CORPORATION ("PARALLAX").  PARALLAX, IN DISTRIBUTING THE CODE TO
END-USERS, AND SUBJECT TO ALL OF THE TERMS AND CONDITIONS HEREIN, GRANTS A
ROYALTY-FREE, PERPETUAL LICENSE TO SUCH END-USERS FOR USE BY SUCH END-USERS
IN USING, DISPLAYING,  AND CREATING DERIVATIVE WORKS THEREOF, SO LONG AS
SUCH USE, DISPLAY OR CREATION IS FOR NON-COMMERCIAL, ROYALTY OR REVENUE
FREE PURPOSES.  IN NO EVENT SHALL THE END-USER USE THE COMPUTER CODE
CONTAINED HEREIN FOR REVENUE-BEARING PURPOSES.  THE END-USER UNDERSTANDS
AND AGREES TO THE TERMS HEREIN AND ACCEPTS THE SAME BY USE OF THIS FILE.
COPYRIGHT 1993-1999 PARALLAX SOFTWARE CORPORATION.  ALL RIGHTS RESERVED.
*/

/*
 *
 * Definitions for graphics lib.
 *
 * Old Log:
 * Revision 1.7  1995/09/13  08:39:44  allender
 * added prototype for gr_bitblt_cockpit
 *
 * Revision 1.6  1995/08/23  18:47:01  allender
 * fixed compiler warnings on mcc
 *
 * Revision 1.5  1995/08/14  15:51:01  allender
 * added #define for transparency color
 *
 * Revision 1.4  1995/06/13  13:03:55  allender
 * added graphics mode
 *
 * Revision 1.3  1995/04/18  09:50:16  allender
 * *** empty log message ***
 *
 * Revision 1.2  1995/04/07  07:32:33  allender
 * *** empty log message ***
 *
 * Revision 1.1  1995/03/09  09:04:16  allender
 * Initial revision
 *
 *
 * --- PC RCS information ---
 * Revision 1.45  1994/11/18  22:50:21  john
 * Changed shorts to ints in parameters.
 *
 * Revision 1.44  1994/11/13  13:04:07  john
 * Added paged out bit in bitmap structure.  Commented out the
 * poly code that is never used.
 *
 * Revision 1.43  1994/11/09  23:04:56  mike
 * Add avg_color field.
 *
 * Revision 1.42  1994/10/27  00:53:35  john
 * Added RLE Flag to bitmap structere.
 *
 * Revision 1.41  1994/10/26  23:55:52  john
 * Took out roller; Took out inverse table.
 *
 * Revision 1.40  1994/08/11  17:59:12  mike
 * Assembler merge functions written for 3 rotations of bitmaps.
 *
 * Revision 1.39  1994/08/10  12:24:56  matt
 * Added support for colors fonts & kerned fonts
 * Made our own font file format
 *
 * Revision 1.38  1994/07/27  18:30:18  john
 * Took away the blending table.
 *
 * Revision 1.37  1994/06/16  15:25:06  mike
 * Add flag BM_FLAG_NO_LIGHTING.
 *
 * Revision 1.36  1994/05/31  10:01:22  john
 * *** empty log message ***
 *
 * Revision 1.35  1994/05/31  07:53:34  john
 * *** empty log message ***
 *
 * Revision 1.34  1994/05/14  17:19:41  matt
 * Added externs
 *
 * Revision 1.33  1994/05/12  17:33:09  john
 * Added circle code.
 *
 * Revision 1.32  1994/05/06  12:50:16  john
 * Added supertransparency; neatend things up; took out warnings.
 *
 * Revision 1.31  1994/05/04  10:06:06  john
 * Added flag for bitmap super-transparency.
 *
 * Revision 1.30  1994/05/03  19:38:56  john
 * *** empty log message ***
 *
 * Revision 1.29  1994/04/22  11:16:05  john
 * *** empty log message ***
 *
 * Revision 1.28  1994/04/08  16:59:32  john
 * Add fading poly's; Made palette fade 32 instead of 16.
 *
 * Revision 1.27  1994/03/16  17:29:52  john
 * *** empty log message ***
 *
 * Revision 1.26  1994/03/16  17:20:51  john
 * Added slow palette searching options.
 *
 * Revision 1.25  1994/03/14  17:59:20  john
 * Added function to check bitmap's transparency.
 *
 * Revision 1.24  1994/03/14  16:56:26  john
 * Changed grs_bitmap structure to include bm_flags.
 *
 * Revision 1.23  1994/02/18  15:32:30  john
 * *** empty log message ***
 *
 * Revision 1.22  1994/01/25  11:40:48  john
 * Added gr_check_mode function.
 *
 * Revision 1.21  1994/01/12  13:45:24  john
 * Added scaler.
 *
 * Revision 1.20  1993/12/21  19:58:24  john
 * added selector stuff
 *
 * Revision 1.19  1993/12/21  11:40:40  john
 * *** empty log message ***
 *
 * Revision 1.18  1993/12/09  15:02:08  john
 * Changed palette stuff majorly
 *
 * Revision 1.17  1993/12/07  12:32:05  john
 * moved bmd_palette to gr_palette
 *
 * Revision 1.16  1993/11/28  12:08:06  mike
 * Change prototype for rotate_bitmap.
 *
 * Revision 1.15  1993/11/18  14:22:51  mike
 * Add prototype for rotate_bitmap.
 *
 * Revision 1.14  1993/11/17  19:00:59  mike
 * Add prototype for test_rotate_bitmap
 *
 * Revision 1.13  1993/11/16  11:28:58  john
 * *** empty log message ***
 *
 * Revision 1.12  1993/10/26  13:17:43  john
 * *** empty log message ***
 *
 * Revision 1.11  1993/10/15  16:23:37  john
 * y
 *
 * Revision 1.10  1993/09/28  15:32:33  john
 * added def for save/restore vidmode
 *
 * Revision 1.9  1993/09/28  12:51:46  matt
 * Added aspect ratio to grs_screen structure
 *
 * Revision 1.8  1993/09/26  22:45:12  matt
 * Changed prototypes for line functions to take fixes, not ints.
 *
 * Revision 1.7  1993/09/26  18:58:16  john
 * fadein/out stuff
 *
 * Revision 1.6  1993/09/14  16:26:44  matt
 * Changed gr_change_mode() to be gr_set_mode()
 *
 * Revision 1.4  1993/09/14  13:08:45  john
 * added gr_change_mode
 *
 * Revision 1.3  1993/09/08  13:56:03  matt
 * Put 'if' block around body of file; added bitmap type BM_RGB15
 *
 * Revision 1.2  1993/09/08  13:02:14  john
 * Changed structure definitions a bit.
 *
 * Revision 1.1  1993/09/08  11:25:15  john
 * Initial revision
 *
 *
 */

#ifndef _GR_H
#define _GR_H

#include "pstypes.h"
#include "fix.h"

#if defined(MACINTOSH) || defined(MACDATA)
#error native mac data currently not supported
#define SWAP_0_255              // swap black and white
#define TRANSPARENCY_COLOR  0   // palette entry of transparency color -- 0 on the mac
#define TRANSPARENCY_COLOR_STR  "0"
#else /* defined(MACINTOSH) || defined(MACDATA) */
/* #undef  SWAP_0_255 */        // no swapping for PC people
#define TRANSPARENCY_COLOR  255 // palette entry of transparency color -- 255 on the PC
#define TRANSPARENCY_COLOR_STR  "255"
#endif /* defined(MACINTOSH) || defined(MACDATA) */

#define GR_FADE_LEVELS 34
#define GR_ACTUAL_FADE_LEVELS 32

#define GWIDTH  grd_curcanv->cv_bitmap.bm_w
#define GHEIGHT grd_curcanv->cv_bitmap.bm_h
#define SWIDTH  (grd_curscreen->sc_w)
#define SHEIGHT (grd_curscreen->sc_h)

#define MAX_BMP_SIZE(width, height) (4 + ((width) + 2) * (height))

extern int Gr_scanline_darkening_level;

typedef struct _grs_point {
        fix x,y;
} grs_point;

//these are control characters that have special meaning in the font code

#define CC_COLOR        1   //next char is new foreground color
#define CC_LSPACING     2   //next char specifies line spacing
#define CC_UNDERLINE    3   //next char is underlined

//now have string versions of these control characters (can concat inside a string)

#define CC_COLOR_S      "\x1"   //next char is new foreground color
#define CC_LSPACING_S   "\x2"   //next char specifies line spacing
#define CC_UNDERLINE_S  "\x3"   //next char is underlined

#define BM_LINEAR   0
#define BM_MODEX    1
#define BM_SVGA     2
#define BM_RGB15    3   //5 bits each r,g,b stored at 16 bits
#define BM_SVGA15   4
#ifdef OGL
#define BM_OGL      5
#endif /* def OGL */

//@@// Define these modes for Gameplay too, since the game was developed under
//@@// DOS, we will adapt these modes to other systems thru rendering.
//@@#define SM_ORIGINAL         -1
//@@#define SM_320x200C     0
//@@#define SM_320x200U     1
//@@#define SM_320x240U     2
//@@#define SM_360x200U     3
//@@#define SM_360x240U     4
//@@#define SM_376x282U     5
//@@#define SM_320x400U     6
//@@#define SM_320x480U     7
//@@#define SM_360x400U     8
//@@#define SM_360x480U     9
//@@#define SM_360x360U     10
//@@#define SM_376x308U     11
//@@#define SM_376x564U     12
//@@#define SM_640x400V     13
//@@#define SM_640x480V     14
//@@#define SM_800x600V     15
//@@#define SM_1024x768V    16
//@@#define SM_640x480V15   17
//@@#define SM_800x600V15   18

#define SM(w,h) ((((u_int32_t)w)<<16)+(((u_int32_t)h)&0xFFFF))
#define SM_W(m) (m>>16)
#define SM_H(m) (m&0xFFFF)


#define BM_FLAG_TRANSPARENT         1
#define BM_FLAG_SUPER_TRANSPARENT   2
#define BM_FLAG_NO_LIGHTING         4
#define BM_FLAG_RLE                 8   // A run-length encoded bitmap.
#define BM_FLAG_PAGED_OUT           16  // This bitmap's data is paged out.
#define BM_FLAG_RLE_BIG             32  // for bitmaps that RLE to > 255 per row (i.e. cockpits)

typedef struct _grs_bitmap {
        short   bm_x,bm_y;  // Offset from parent's origin
        short   bm_w,bm_h;  // width,height
        sbyte   bm_type;    // 0=Linear, 1=ModeX, 2=SVGA
        sbyte   bm_flags;   // bit 0 on means it has transparency.
                            // bit 1 on means it has supertransparency
                            // bit 2 on means it doesn't get passed through lighting.
        short   bm_rowsize; // unsigned char offset to next row
        unsigned char *     bm_data;    // ptr to pixel data...
                                        //   Linear = *parent+(rowsize*y+x)
                                        //   ModeX = *parent+(rowsize*y+x/4)
                                        //   SVGA = *parent+(rowsize*y+x)
        unsigned short      bm_handle;  //for application.  initialized to 0
        ubyte   avg_color;  //  Average color of all pixels in texture map.
        sbyte   unused;     // to 4-byte align.
#ifdef OGL
        struct _ogl_texture *gltexture;
        struct _grs_bitmap  *bm_parent;
#endif /* def OGL */
} grs_bitmap;

//font structure
typedef struct _grs_font {
        short       ft_w;           // Width in pixels
        short       ft_h;           // Height in pixels
        short       ft_flags;       // Proportional?
        short       ft_baseline;    //
        ubyte       ft_minchar;     // First char defined by this font
        ubyte       ft_maxchar;     // Last char defined by this font
        short       ft_bytewidth;   // Width in unsigned chars
        ubyte     * ft_data;        // Ptr to raw data.
        ubyte    ** ft_chars;       // Ptrs to data for each char (required for prop font)
        short     * ft_widths;      // Array of widths (required for prop font)
        ubyte     * ft_kerndata;    // Array of kerning triplet data
#ifdef OGL
        // These fields do not participate in disk i/o!
        grs_bitmap *ft_bitmaps;
        grs_bitmap ft_parent_bitmap;
#endif /* def OGL */
} __pack__ grs_font;

#define GRS_FONT_SIZE 28    // how much space it takes up on disk

typedef struct _grs_canvas {
        grs_bitmap  cv_bitmap;      // the bitmap for this canvas
        short       cv_color;       // current color
        short       cv_drawmode;    // fill,XOR,etc.
        grs_font *  cv_font;        // the currently selected font
        short       cv_font_fg_color;   // current font foreground color (-1==Invisible)
        short       cv_font_bg_color;   // current font background color (-1==Invisible)
} grs_canvas;

//shortcuts
#define cv_w cv_bitmap.bm_w
#define cv_h cv_bitmap.bm_h

typedef struct _grs_screen {    // This is a video screen
        grs_canvas  sc_canvas;  // Represents the entire screen
        int     sc_mode;        // Video mode number
        short   sc_w, sc_h;     // Actual Width and Height
        fix     sc_aspect;      //aspect ratio (w/h) for this screen
} grs_screen;


//=========================================================================
// System functions:
// setup and set mode. this creates a grs_screen structure and sets
// grd_curscreen to point to it.  grs_curcanv points to this screen's
// canvas.  Saves the current VGA state and screen mode.

int gr_init(void);

// This function sets up the main screen.  It should be called whenever
// the video mode changes.
int gr_init_screen(int mode, int w, int h, int x, int y, int rowsize, ubyte *data);

int gr_check_mode(u_int32_t mode);
int gr_set_mode(u_int32_t mode);


// These 4 functions actuall change screen colors.

extern void gr_pal_fade_out(unsigned char * pal);
extern void gr_pal_fade_in(unsigned char * pal);
extern void gr_pal_clear(void);
extern void gr_pal_setblock( int start, int number, unsigned char * pal );
extern void gr_pal_getblock( int start, int number, unsigned char * pal );


extern unsigned char *gr_video_memory;
                                                    // All graphic modules will define this value.

//shut down the 2d.  Restore the screen mode.
void gr_close(void);

//=========================================================================
// Canvas functions:

// Makes a new canvas. allocates memory for the canvas and its bitmap,
// including the raw pixel buffer.

grs_canvas *gr_create_canvas(int w, int h);
#if defined(POLY_ACC)
grs_canvas *gr_create_canvas2(int w, int h, int type);
#endif /* def POLY_ACC */

// Creates a canvas that is part of another canvas.  this can be used to make
// a window on the screen.  the canvas structure is malloc'd; the address of
// the raw pixel data is inherited from the parent canvas.

grs_canvas *gr_create_sub_canvas(grs_canvas *canv,int x,int y,int w, int h);

// Initialize the specified canvas. the raw pixel data buffer is passed as
// a parameter. no memory allocation is performed.

void gr_init_canvas(grs_canvas *canv,unsigned char *pixdata,int pixtype, int w,int h);

// Initialize the specified sub canvas. no memory allocation is performed.

void gr_init_sub_canvas(grs_canvas *new,grs_canvas *src,int x,int y,int w, int h);

// Free up the canvas and its pixel data.

void gr_free_canvas(grs_canvas *canv);

// Free up the canvas. do not free the pixel data, which belongs to the
// parent canvas.

void gr_free_sub_canvas(grs_canvas *canv);

// Clear the current canvas to the specified color
void gr_clear_canvas(int color);

//=========================================================================
// Bitmap functions:

// Allocate a bitmap and its pixel data buffer.
grs_bitmap *gr_create_bitmap(int w,int h);

// Allocated a bitmap and makes its data be raw_data that is already somewhere.
grs_bitmap *gr_create_bitmap_raw(int w, int h, unsigned char * raw_data );

#if defined(POLY_ACC)
// Allocates a bitmap of a specific type. data is either NULL or raw data.
grs_bitmap *gr_create_bitmap2(int w, int h, int type, void *data );
#endif /* def POLY_ACC */

// Creates a bitmap which is part of another bitmap
grs_bitmap *gr_create_sub_bitmap(grs_bitmap *bm,int x,int y,int w, int h);

// Free the bitmap and its pixel data
void gr_free_bitmap(grs_bitmap *bm);

// Free the bitmap's data
void gr_free_bitmap_data (grs_bitmap *bm);
void gr_init_bitmap_data (grs_bitmap *bm);

// Free the bitmap, but not the pixel data buffer
void gr_free_sub_bitmap(grs_bitmap *bm);

void gr_bm_pixel( grs_bitmap * bm, int x, int y, unsigned char color );
void gr_bm_upixel( grs_bitmap * bm, int x, int y, unsigned char color );
void gr_bm_bitblt(int w, int h, int dx, int dy, int sx, int sy, grs_bitmap * src, grs_bitmap * dest);
void gr_bm_ubitblt( int w, int h, int dx, int dy, int sx, int sy, grs_bitmap * src, grs_bitmap * dest);
void gr_bm_ubitbltm(int w, int h, int dx, int dy, int sx, int sy, grs_bitmap * src, grs_bitmap * dest);

#ifdef MACINTOSH
void gr_bm_ubitblt_double(int w, int h, int dx, int dy, int sx, int sy, grs_bitmap *src, grs_bitmap *dest);
void gr_linear_movsd_double(ubyte *src, ubyte *dest, int num_pixels);
#endif /* def MACINTOSH */

void gr_update_buffer( void * sbuf1, void * sbuf2, void * dbuf, int size );

void gr_set_transparent(grs_bitmap *pbm, int bTransparent);

//=========================================================================
// Color functions:

// When this function is called, the guns are set to gr_palette, and
// the palette stays the same until gr_close is called

void gr_use_palette_table(char * filename );
void gr_copy_palette(ubyte *gr_palette, ubyte *pal, int size);

//=========================================================================
// Drawing functions:

// For solid, XOR, or other fill modes.
int gr_set_drawmode(int mode);

// Sets the color in the current canvas.  should be a macro
// Use: gr_setcolor(int color);
void gr_setcolor(int color);

// Draw a polygon into the current canvas in the current color and drawmode.
// verts points to an ordered list of x,y pairs.  the polygon should be
// convex; a concave polygon will be handled in some reasonable manner,
// but not necessarily shaded as a concave polygon. It shouldn't hang.
// probably good solution is to shade from minx to maxx on each scan line.
// int should really be fix
int gr_poly(int nverts,int *verts);
int gr_upoly(int nverts,int *verts);


// Draws a point into the current canvas in the current color and drawmode.
void gr_pixel(int x,int y);
void gr_upixel(int x,int y);

// Gets a pixel;
unsigned char gr_gpixel( grs_bitmap * bitmap, int x, int y );
unsigned char gr_ugpixel( grs_bitmap * bitmap, int x, int y );

// Draws a line into the current canvas in the current color and drawmode.
int gr_line(fix x0,fix y0,fix x1,fix y1);
int gr_uline(fix x0,fix y0,fix x1,fix y1);

// Draws an anti-aliased line into the current canvas in the current color and drawmode.
int gr_aaline(fix x0,fix y0,fix x1,fix y1);
int gr_uaaline(fix x0,fix y0,fix x1,fix y1);

// Draw the bitmap into the current canvas at the specified location.
void gr_bitmap(int x,int y,grs_bitmap *bm);
void gr_ubitmap(int x,int y,grs_bitmap *bm);
void gr_bitmap_scale_to(grs_bitmap *src, grs_bitmap *dst);
void show_fullscr(grs_bitmap *bm);

// bitmap function with transparency
void gr_bitmapm( int x, int y, grs_bitmap *bm );
void gr_ubitmapm( int x, int y, grs_bitmap *bm );

// Draw a rectangle into the current canvas.
void gr_rect(int left,int top,int right,int bot);
void gr_urect(int left,int top,int right,int bot);

// Draw a filled circle
int gr_disk(fix x,fix y,fix r);
int gr_udisk(fix x,fix y,fix r);

// Draw an outline circle
int gr_circle(fix x,fix y,fix r);
int gr_ucircle(fix x,fix y,fix r);

// Draw an unfilled rectangle into the current canvas
void gr_box(int left,int top,int right,int bot);
void gr_ubox(int left,int top,int right,int bot);

void gr_scanline( int x1, int x2, int y );
void gr_uscanline( int x1, int x2, int y );


// Reads in a font file... current font set to this one.
grs_font * gr_init_font( char * fontfile );
void gr_close_font( grs_font * font );

//remap a font, re-reading its data & palette
void gr_remap_font( grs_font *font, char * fontname, char *font_data );

//remap (by re-reading) all the color fonts
void gr_remap_color_fonts();
void gr_remap_mono_fonts();

// Writes a string using current font. Returns the next column after last char.
void gr_set_fontcolor( int fg, int bg );
void gr_set_curfont( grs_font * new );
int gr_string(int x, int y, char *s );
int gr_ustring(int x, int y, char *s );
int gr_printf( int x, int y, char * format, ... );
int gr_uprintf( int x, int y, char * format, ... );
void gr_get_string_size(char *s, int *string_width, int *string_height, int *average_width );


//  From roller.c
void rotate_bitmap(grs_bitmap *bp, grs_point *vertbuf, int light_value);

// From scale.c
void scale_bitmap(grs_bitmap *bp, grs_point *vertbuf, int orientation );

//===========================================================================
// Global variables
extern grs_canvas *grd_curcanv;             //active canvas
extern grs_screen *grd_curscreen;           //active screen
extern unsigned char Test_bitmap_data[64*64];

//shortcut to look at current font
#define grd_curfont grd_curcanv->cv_font

extern int gr_renderstats;

extern unsigned int FixDivide( unsigned int x, unsigned int y );

extern void gr_show_canvas( grs_canvas *canv );
extern void gr_set_current_canvas( grs_canvas *canv );

//flags for fonts
#define FT_COLOR        1
#define FT_PROPORTIONAL 2
#define FT_KERNED       4

extern void gr_vesa_update( grs_bitmap * source1, grs_bitmap * dest, grs_bitmap * source2 );

// Special effects
extern void gr_snow_out(int num_dots);

extern void test_rotate_bitmap(void);
extern void rotate_bitmap(grs_bitmap *bp, grs_point *vertbuf, int light_value);

extern ubyte gr_palette[256*3];
extern ubyte gr_fade_table[256*GR_FADE_LEVELS];
extern ubyte gr_inverse_table[32*32*32];

extern ushort gr_palette_selector;
extern ushort gr_inverse_table_selector;
extern ushort gr_fade_table_selector;

// Remaps a bitmap into the current palette. If transparent_color is
// between 0 and 255 then all occurances of that color are mapped to
// whatever color the 2d uses for transparency. This is normally used
// right after a call to iff_read_bitmap like this:
//              iff_error = iff_read_bitmap(filename,new,BM_LINEAR,newpal);
//              if (iff_error != IFF_NO_ERROR) Error("Can't load IFF file <%s>, error=%d",filename,iff_error);
//              if ( iff_has_transparency )
//                      gr_remap_bitmap( new, newpal, iff_transparent_color );
//              else
//                      gr_remap_bitmap( new, newpal, -1 );
extern void gr_remap_bitmap( grs_bitmap * bmp, ubyte * palette, int transparent_color, int super_transparent_color );

// Same as above, but searches using gr_find_closest_color which uses
// 18-bit accurracy instead of 15bit when translating colors.
extern void gr_remap_bitmap_good( grs_bitmap * bmp, ubyte * palette, int transparent_color, int super_transparent_color );

extern void build_colormap_good( ubyte * palette, ubyte * colormap, int * freq );

extern void gr_palette_step_up( int r, int g, int b );

extern void gr_bitmap_check_transparency( grs_bitmap * bmp );

// Allocates a selector that has a base address at 'address' and length 'size'.
// Returns 0 if successful... BE SURE TO CHECK the return value since there
// is a limited number of selectors available!!!
extern int get_selector( void * address, int size, unsigned int * selector );

// Assigns a selector to a bitmap. Returns 0 if successful.  BE SURE TO CHECK
// this return value since there is a limited number of selectors!!!!!!!
extern int gr_bitmap_assign_selector( grs_bitmap * bmp );

//#define GR_GETCOLOR(r,g,b) (gr_inverse_table[( (((r)&31)<<10) | (((g)&31)<<5) | ((b)&31) )])
//#define gr_getcolor(r,g,b) (gr_inverse_table[( (((r)&31)<<10) | (((g)&31)<<5) | ((b)&31) )])
//#define BM_XRGB(r,g,b) (gr_inverse_table[( (((r)&31)<<10) | (((g)&31)<<5) | ((b)&31) )])

#define BM_RGB(r,g,b) ( (((r)&31)<<10) | (((g)&31)<<5) | ((b)&31) )
#define BM_XRGB(r,g,b) gr_find_closest_color( (r)*2,(g)*2,(b)*2 )
#define GR_GETCOLOR(r,g,b) gr_find_closest_color( (r)*2,(g)*2,(b)*2 )
#define gr_getcolor(r,g,b) gr_find_closest_color( (r)*2,(g)*2,(b)*2 )

// Given: r,g,b, each in range of 0-63, return the color index that
// best matches the input.
int gr_find_closest_color( int r, int g, int b );
int gr_find_closest_color_15bpp( int rgb );

extern void gr_merge_textures( ubyte * lower, ubyte * upper, ubyte * dest );
extern void gr_merge_textures_1( ubyte * lower, ubyte * upper, ubyte * dest );
extern void gr_merge_textures_2( ubyte * lower, ubyte * upper, ubyte * dest );
extern void gr_merge_textures_3( ubyte * lower, ubyte * upper, ubyte * dest );

extern void gr_update(void);

/*
 * currently SDL and OGL are the only things that supports toggling
 * fullscreen.  otherwise add other checks to the #if -MPM
 */
#if (defined(SDL_VIDEO) || defined(OGL))
#define GR_SUPPORTS_FULLSCREEN_TOGGLE

/*
 * must return 0 if windowed, 1 if fullscreen
 */
int gr_check_fullscreen(void);

/*
 * returns state after toggling (ie, same as if you had called
 * check_fullscreen immediatly after)
 */
int gr_toggle_fullscreen(void);

#endif /* defined(SDL_VIDEO) || defined(OGL)) */

/* currently only OGL can toggle in the menus, because its screen data
 * is not used (and stays in the same place).  whereas software modes,
 * toggling fullscreen would very likely make the data buffer point to
 * a different location, and all the subbitmaps of it would have
 * invalid addresses in them. */
#ifdef OGL
#define GR_SUPPORTS_FULLSCREEN_MENU_TOGGLE
#endif
int gr_toggle_fullscreen_menu(void);//returns state after toggling (ie, same as if you had called check_fullscreen immediatly after)

#endif /* def _GR_H */