SRB2/src/hardware/hw_defs.h

// Emacs style mode select   -*- C++ -*-
//-----------------------------------------------------------------------------
//
// Copyright (C) 1998-2000 by DooM Legacy Team.
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//-----------------------------------------------------------------------------
/// \file
/// \brief 3D hardware renderer definitions

#ifndef _HWR_DEFS_
#define _HWR_DEFS_
#include "../doomtype.h"

#define ZCLIP_PLANE 4.0f // Used for the actual game drawing
#define NZCLIP_PLANE 0.9f // Seems to be only used for the HUD and screen textures

// ==========================================================================
//                                                               SIMPLE TYPES
// ==========================================================================

typedef long            FINT;
typedef unsigned long   FUINT;
typedef unsigned char   FUBYTE;
typedef unsigned long   FBITFIELD;
#ifndef __MINGW32__
typedef float           FLOAT;
#endif
typedef unsigned char   FBOOLEAN;

// ==========================================================================
//                                                                     COLORS
// ==========================================================================

// byte value for paletted graphics, which represent the transparent color
#ifdef _NDS
// NDS is hardwired to use zero as transparent color
#define HWR_PATCHES_CHROMAKEY_COLORINDEX   0
#define HWR_CHROMAKEY_EQUIVALENTCOLORINDEX 1
#else
#define HWR_PATCHES_CHROMAKEY_COLORINDEX   247
#define HWR_CHROMAKEY_EQUIVALENTCOLORINDEX 220
#endif

// the chroma key color shows on border sprites, set it to black
#define HWR_PATCHES_CHROMAKEY_COLORVALUE     (0x00000000)    //RGBA format as in grSstWinOpen()

// RGBA Color components with float type ranging [ 0 ... 1 ]
struct FRGBAFloat
{
	FLOAT   red;
	FLOAT   green;
	FLOAT   blue;
	FLOAT   alpha;
};
typedef struct FRGBAFloat FRGBAFloat;

struct FColorARGB
{
	FUBYTE  alpha;
	FUBYTE  red;
	FUBYTE  green;
	FUBYTE  blue;
};
typedef struct FColorARGB ARGB_t;
typedef struct FColorARGB FColorARGB;



// ==========================================================================
//                                                                    VECTORS
// ==========================================================================

// Simple 2D coordinate
typedef struct
{
	FLOAT x,y;
} F2DCoord, v2d_t;

// Simple 3D vector
typedef struct FVector
{
		FLOAT x,y,z;
} FVector;

// 3D model vector (coords + texture coords)
typedef struct
{
	//FVector     Point;
	FLOAT       x,y,z;
	FLOAT       s,t,w;            // texture coordinates
} v3d_t, wallVert3D;

//Hurdler: Transform (coords + angles)
//BP: transform order : scale(rotation_x(rotation_y(translation(v))))
typedef struct
{
	FLOAT       x,y,z;           // position
	FLOAT       anglex,angley;   // aimingangle / viewangle
	FLOAT       scalex,scaley,scalez;
	FLOAT       fovxangle, fovyangle;
	INT32       splitscreen;
	boolean     flip;            // screenflip
} FTransform;

// Transformed vector, as passed to HWR API
typedef struct
{
	FLOAT       x,y,z;
	FUINT       argb;           // flat-shaded color
	FLOAT       sow;            // s texture ordinate (s over w)
	FLOAT       tow;            // t texture ordinate (t over w)
} FOutVector;


// ==========================================================================
//                                                               RENDER MODES
// ==========================================================================

// Flags describing how to render a polygon
// You pass a combination of these flags to DrawPolygon()
enum EPolyFlags
{
		// the first 5 are mutually exclusive

	PF_Masked           = 0x00000001,   // Poly is alpha scaled and 0 alpha pels are discarded (holes in texture)
	PF_Translucent      = 0x00000002,   // Poly is transparent, alpha = level of transparency
	PF_Additive         = 0x00000004,   // Poly is added to the frame buffer
	PF_Environment      = 0x00000008,   // Poly should be drawn environment mapped.
	                                    // Hurdler: used for text drawing
	PF_Substractive     = 0x00000010,   // for splat
	PF_NoAlphaTest      = 0x00000020,   // hiden param
	PF_Fog              = 0x00000040,   // Fog blocks
	PF_Blending         = (PF_Environment|PF_Additive|PF_Translucent|PF_Masked|PF_Substractive|PF_Fog)&~PF_NoAlphaTest,

		// other flag bits

	PF_Occlude          = 0x00000100,   // Update the depth buffer
	PF_NoDepthTest      = 0x00000200,   // Disable the depth test mode
	PF_Invisible        = 0x00000400,   // Disable write to color buffer
	PF_Decal            = 0x00000800,   // Enable polygon offset
	PF_Modulated        = 0x00001000,   // Modulation (multiply output with constant ARGB)
	                                    // When set, pass the color constant into the FSurfaceInfo -> FlatColor
	PF_NoTexture        = 0x00002000,   // Use the small white texture
	PF_Corona           = 0x00004000,   // Tell the rendrer we are drawing a corona
	PF_MD2              = 0x00008000,   // Tell the rendrer we are drawing an MD2
	PF_RemoveYWrap      = 0x00010000,   // Force clamp texture on Y
	PF_ForceWrapX       = 0x00020000,   // Force repeat texture on X
	PF_ForceWrapY       = 0x00040000,   // Force repeat texture on Y
	PF_Clip             = 0x40000000,   // clip to frustum and nearz plane (glide only, automatic in opengl)
	PF_NoZClip          = 0x20000000,   // in conjonction with PF_Clip
	PF_Debug            = 0x80000000    // print debug message in driver :)
};


enum ESurfFlags
{
	SF_DYNLIGHT         = 0x00000001,

};

enum ETextureFlags
{
	TF_WRAPX       = 0x00000001,        // wrap around X
	TF_WRAPY       = 0x00000002,        // wrap around Y
	TF_WRAPXY      = TF_WRAPY|TF_WRAPX, // very common so use alias is more easy
	TF_CHROMAKEYED = 0x00000010,
	TF_TRANSPARENT = 0x00000040,        // texture with some alpha == 0
};

#ifdef TODO
struct FTextureInfo
{
	FUINT       Width;              // Pixels
	FUINT       Height;             // Pixels
	FUBYTE     *TextureData;        // Image data
	FUINT       Format;             // FORMAT_RGB, ALPHA ...
	FBITFIELD   Flags;              // Flags to tell driver about texture (see ETextureFlags)
	void        DriverExtra;        // (OpenGL texture object nr, ...)
	                                // chromakey enabled,...

	struct FTextureInfo *Next;      // Manage list of downloaded textures.
};
#else
typedef struct GLMipmap_s FTextureInfo;
#endif

// Description of a renderable surface
struct FSurfaceInfo
{
	FUINT    PolyFlags;          // Surface flags -- UNUSED YET --
	RGBA_t   FlatColor;          // Flat-shaded color used with PF_Modulated mode
};
typedef struct FSurfaceInfo FSurfaceInfo;

//Hurdler: added for backward compatibility
enum hwdsetspecialstate
{
	HWD_SET_FOG_TABLE = 1,
	HWD_SET_FOG_MODE,
	HWD_SET_FOG_COLOR,
	HWD_SET_FOG_DENSITY,
	HWD_SET_FOV,
	HWD_SET_POLYGON_SMOOTH,
	HWD_SET_PALETTECOLOR,
	HWD_SET_TEXTUREFILTERMODE,
	HWD_SET_TEXTUREANISOTROPICMODE,
	HWD_NUMSTATE
};

typedef enum hwdsetspecialstate hwdspecialstate_t;

enum hwdfiltermode
{
	HWD_SET_TEXTUREFILTER_POINTSAMPLED,
	HWD_SET_TEXTUREFILTER_BILINEAR,
	HWD_SET_TEXTUREFILTER_TRILINEAR,
	HWD_SET_TEXTUREFILTER_MIXED1,
	HWD_SET_TEXTUREFILTER_MIXED2,
	HWD_SET_TEXTUREFILTER_MIXED3,
};


#endif //_HWR_DEFS_