/* DE1: $Id: gl_model.h 1713 2004-05-31 15:04:44Z skyjake $
 * Copyright (C) 2003, 2004 Jaakko Keränen <jaakko.keranen@iki.fi>
 *
 * 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.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not: http://www.opensource.org/
 */

/*
 * gl_model.h: 3D Model Constants and Data Structures
 *
 * Supported model formats: MD2 and DMD2.
 */

#ifndef __DOOMSDAY_MODEL_H__
#define __DOOMSDAY_MODEL_H__

#include "dd_types.h"
#include "r_data.h"

#define MD2_MAGIC			0x32504449
#define NUMVERTEXNORMALS	162
#define MAX_MODELS			768

// "DMDM" = Doomsday/Detailed MoDel Magic
#define DMD_MAGIC			0x4D444D44
#define MAX_LODS			4

typedef struct {
	int             magic;
	int             version;
	int             skinWidth;
	int             skinHeight;
	int             frameSize;
	int             numSkins;
	int             numVertices;
	int             numTexCoords;
	int             numTriangles;
	int             numGlCommands;
	int             numFrames;
	int             offsetSkins;
	int             offsetTexCoords;
	int             offsetTriangles;
	int             offsetFrames;
	int             offsetGlCommands;
	int             offsetEnd;
} md2_header_t;

typedef struct {
	byte            vertex[3];
	byte            lightNormalIndex;
} md2_triangleVertex_t;

typedef struct {
	float           scale[3];
	float           translate[3];
	char            name[16];
	md2_triangleVertex_t vertices[1];
} md2_packedFrame_t;

typedef struct {
	float           vertex[3];
	byte            lightNormalIndex;
} md2_modelVertex_t;

// Translated frame (vertices in model space).
typedef struct {
	char            name[16];
	md2_modelVertex_t *vertices;
} md2_frame_t;

typedef struct {
	char            name[256];
	int             id;
} md2_skin_t;

typedef struct {
	short           vertexIndices[3];
	short           textureIndices[3];
} md2_triangle_t;

typedef struct {
	short           s, t;
} md2_textureCoordinate_t;

typedef struct {
	float           s, t;
	int             vertexIndex;
} md2_glCommandVertex_t;

//===========================================================================
// DMD (Detailed/Doomsday Models)
//===========================================================================

typedef struct {
	int             magic;
	int             version;
	int             flags;
} dmd_header_t;

// Chunk types.
enum {
	DMC_END,					   // Must be the last chunk.
	DMC_INFO					   // Required; will be expected to exist.
};

typedef struct {
	int             type;
	int             length;		   // Next chunk follows...
} dmd_chunk_t;

typedef struct					   // DMC_INFO
{
	int             skinWidth;
	int             skinHeight;
	int             frameSize;
	int             numSkins;
	int             numVertices;
	int             numTexCoords;
	int             numFrames;
	int             numLODs;
	int             offsetSkins;
	int             offsetTexCoords;
	int             offsetFrames;
	int             offsetLODs;
	int             offsetEnd;
} dmd_info_t;

typedef struct {
	int             numTriangles;
	int             numGlCommands;
	int             offsetTriangles;
	int             offsetGlCommands;
} dmd_levelOfDetail_t;

#pragma pack(1)
typedef struct {
	byte            vertex[3];
	unsigned short  normal;		   // Yaw and pitch.
} dmd_packedVertex_t;

typedef struct {
	float           scale[3];
	float           translate[3];
	char            name[16];
	dmd_packedVertex_t vertices[1];
} dmd_packedFrame_t;

#pragma pack()

/*typedef struct
   {
   float vertex[3];
   float normal[3];
   } dmd_vertex_t;

   // Translated frame (vertices in model space).
   typedef struct
   {
   char name[16];
   dmd_vertex_t *vertices;
   } dmd_frame_t; */

typedef struct {
	char            name[256];
	int             id;
} dmd_skin_t;

typedef struct {
	short           vertexIndices[3];
	short           textureIndices[3];
} dmd_triangle_t;

typedef struct {
	short           s, t;
} dmd_textureCoordinate_t;

typedef struct {
	float           s, t;
	int             vertexIndex;
} dmd_glCommandVertex_t;

typedef struct {
	//dmd_triangle_t    *triangles;
	int            *glCommands;
} dmd_lod_t;

typedef struct model_vertex_s {
	float           xyz[3];
} model_vertex_t;

typedef struct model_frame_s {
	char            name[16];
	model_vertex_t *vertices;
	model_vertex_t *normals;
} model_frame_t;

typedef struct model_s {
	boolean         loaded;
	char            fileName[256]; // Name of the md2 file.
	dmd_header_t    header;
	dmd_info_t      info;
	dmd_skin_t     *skins;
	//dmd_textureCoordinate_t *texCoords;
	model_frame_t  *frames;
	dmd_levelOfDetail_t lodInfo[MAX_LODS];
	dmd_lod_t       lods[MAX_LODS];
	char           *vertexUsage;   // Bitfield for each vertex.
	boolean         allowTexComp;  // Allow texture compression with this.
} model_t;

extern model_t *modellist[MAX_MODELS];
extern float    avertexnormals[NUMVERTEXNORMALS][3];

#endif