/*
 * Copyright (C) Volition, Inc. 1999.  All rights reserved.
 *
 * All source code herein is the property of Volition, Inc. You may not sell 
 * or otherwise commercially exploit the source or things you created based on the 
 * source.
 *
*/ 


#ifndef _GRINTERNAL_H
#define _GRINTERNAL_H

#include "graphics/font.h"
#include "graphics/2d.h"
#include "globalincs/pstypes.h" // IAM_64BIT
#include "globalincs/globals.h" // just in case pstypes.h messed up

extern int Gr_cursor;
extern int Gr_cursor_size;

extern ubyte Gr_original_palette[768];		// The palette 
extern ubyte Gr_current_palette[768];

extern char Gr_current_palette_name[128];

typedef struct color_gun {
	int	bits;
	int	shift;
	int	scale;
	int	mask;
} color_gun;

// screen format
extern color_gun Gr_red, Gr_green, Gr_blue, Gr_alpha;

// texture format
extern color_gun Gr_t_red, Gr_t_green, Gr_t_blue, Gr_t_alpha;

// alpha texture format
extern color_gun Gr_ta_red, Gr_ta_green, Gr_ta_blue, Gr_ta_alpha;

// CURRENT FORMAT - note - this is what bmpman uses when fiddling with pixels/colors. so be sure its properly set to one
// of the above values
extern color_gun *Gr_current_red, *Gr_current_green, *Gr_current_blue, *Gr_current_alpha;

extern float Gr_gamma;
extern int Gr_gamma_int;

#define TCACHE_TYPE_AABITMAP				0		// HUD bitmap.  All Alpha.
#define TCACHE_TYPE_NORMAL					1		// Normal bitmap. Alpha = 0.
#define TCACHE_TYPE_XPARENT					2		// Bitmap with 0,255,0 = transparent.  Alpha=0 if transparent, 1 if not.
#define TCACHE_TYPE_INTERFACE				3		// for graphics that are using in the interface (for special filtering or sizing)
#define TCACHE_TYPE_COMPRESSED				4		// Compressed bitmap type (DXT1, DXT3, DXT5)
#define TCACHE_TYPE_CUBEMAP					5

#define NEBULA_COLORS 20

typedef enum gr_texture_source {
	TEXTURE_SOURCE_NONE,
	TEXTURE_SOURCE_DECAL,
	TEXTURE_SOURCE_NO_FILTERING,
	TEXTURE_SOURCE_MODULATE4X
} gr_texture_source;

typedef enum gr_alpha_blend {
	ALPHA_BLEND_NONE,					// 1*SrcPixel + 0*DestPixel
	ALPHA_BLEND_ADDITIVE,				// 1*SrcPixel + 1*DestPixel
	ALPHA_BLEND_ALPHA_ADDITIVE,			// Alpha*SrcPixel + 1*DestPixel
	ALPHA_BLEND_ALPHA_BLEND_ALPHA,		// Alpha*SrcPixel + (1-Alpha)*DestPixel
	ALPHA_BLEND_ALPHA_BLEND_SRC_COLOR,	// Alpha*SrcPixel + (1-SrcPixel)*DestPixel
	ALPHA_BLEND_PREMULTIPLIED			// 1*SrcPixel + (1-Alpha)*DestPixel
} gr_alpha_blend;

typedef enum gr_zbuffer_type {
	ZBUFFER_TYPE_NONE,
	ZBUFFER_TYPE_READ,
	ZBUFFER_TYPE_WRITE,
	ZBUFFER_TYPE_FULL,
	ZBUFFER_TYPE_DEFAULT
} gr_zbuffer_type;

typedef enum gr_stencil_type {
    STENCIL_TYPE_NONE,
    STENCIL_TYPE_READ,
    STENCIL_TYPE_WRITE
} gr_stencil_type;

#endif