/*
   Copyright (C) 2001-2006, William Joseph.
   All Rights Reserved.

   This file is part of GtkRadiant.

   GtkRadiant 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.

   GtkRadiant 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 GtkRadiant; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#include "wal32.h"

#include "ifilesystem.h"

#include "bytestreamutils.h"
#include "imagelib.h"

typedef unsigned char byte;

const int M32_NAME_LENGTH = 128;
const int M32_MIPMAP_COUNT = 16;

typedef struct m32_header_t
{
	int version;
	char name[M32_NAME_LENGTH];
	char altname[M32_NAME_LENGTH];                      // texture substitution
	char animname[M32_NAME_LENGTH];                     // next frame in animation chain
	char damagename[M32_NAME_LENGTH];                   // image that should be shown when damaged
	unsigned width[M32_MIPMAP_COUNT], height[M32_MIPMAP_COUNT];
	unsigned offsets[M32_MIPMAP_COUNT];
	int flags;
	int contents;
	int value;
	float scale_x, scale_y;
	int mip_scale;

	// detail texturing info
	char dt_name[M32_NAME_LENGTH];              // detailed texture name
	float dt_scale_x, dt_scale_y;
	float dt_u, dt_v;
	float dt_alpha;
	int dt_src_blend_mode, dt_dst_blend_mode;

	int unused[20];                         // future expansion to maintain compatibility with h2
} m32_header_t;


Image* LoadM32Buff( byte* buffer ){
	PointerInputStream inputStream( buffer );

	inputStream.seek( 4 // version
					  + M32_NAME_LENGTH // name
					  + M32_NAME_LENGTH // altname
					  + M32_NAME_LENGTH // animname
					  + M32_NAME_LENGTH ); // damagename
	int w = istream_read_uint32_le( inputStream );
	inputStream.seek( 4 * ( M32_MIPMAP_COUNT - 1 ) ); // remaining widths
	int h = istream_read_uint32_le( inputStream );
	inputStream.seek( 4 * ( M32_MIPMAP_COUNT - 1 ) ); // remaining heights
	int offset = istream_read_uint32_le( inputStream );
	inputStream.seek( 4 * ( M32_MIPMAP_COUNT - 1 ) ); // remaining offsets
	int flags = istream_read_uint32_le( inputStream );
	int contents = istream_read_uint32_le( inputStream );
	int value = istream_read_uint32_le( inputStream );

	RGBAImageFlags* image = new RGBAImageFlags( w, h, flags, contents, value );

	const byte* source = buffer + offset;
	std::copy( source, source + ( w * h * 4 ), image->getRGBAPixels() );

	return image;
}

Image* LoadM32( ArchiveFile& file ){
	ScopedArchiveBuffer buffer( file );
	return LoadM32Buff( buffer.buffer );
}