/**
 * @file		hmt_struct.h
 * @date		26/08/2022
 * @author		JackCarterSmith
 * @copyright	GPL-v3.0
 * @brief 		HMT file mapping definition.
 *
 */

#ifndef RSPTEXTURELIB_HMT_STRUCT_H_
#define RSPTEXTURELIB_HMT_STRUCT_H_


/*
 * long = 64bits???	(8 Bytes)
 * int = 32bits		(4 Bytes)
 * short = 16bits	(2 Bytes)
 * char = 8bits		(1 Bytes)
 */

#if defined(_MSC_VER)
#define PACK
#elif defined(__GNUC__)
#define PACK __attribute__((packed))
#endif

///////////////////////////////////////////////////////////////////////////////
//                   Declaration of Memory Mapped Structure
//	    Caution: the place of variable is important for correct mapping!
///////////////////////////////////////////////////////////////////////////////

#if defined(_MSC_VER)
#pragma pack(push, 1)
#endif

typedef struct PACK hmtfile_header1 {
	unsigned int materials_count;
	unsigned int textures_offset;
} T_HMTFILE_HEADER1;

typedef struct PACK hmtfile_header2 {
	unsigned int textures_count;
} T_HMTFILE_HEADER2;

typedef struct PACK hmtfile_material {
	unsigned short type;		// 1 - Material with texture / 2 - Material without texture
	unsigned short texture_index;

	float reserved0;			// misc.			Diffuse? Transparent?
	float reserved1;			// Always 1.0f		Ambient?

	unsigned int reserved2;		// Zero				Specular?
	unsigned int reserved3;		// 0x0A

	unsigned char name[16];
} T_HMTFILE_MATERIAL;

typedef struct PACK hmtfile_texture_format {
	unsigned char reserved0;	// Always 1 ?
	unsigned char sample_bitsize;
	unsigned char type;
	/*
		0 - palette 16x3B RGB, 4bit per pixel
		1 - 256x3B palette RGB, 8bit per pixel
		3 - RGBA 32bpp
		4 - greyscale, 4bpp
		5 - grayscale, 8bpp
	*/
	unsigned char unknown0;		// 0x40 / 0x80
	unsigned int transparent_color;		//TODO: replace by T_PIXEL type
} T_HMTFILE_TEXTURE_FORMAT;

typedef struct PACK hmtfile_texture_header {
	unsigned int pixels_offset;

	unsigned int reserved0;		// 28B zeros
	unsigned int reserved1;
	unsigned int reserved2;
	unsigned int reserved3;
	unsigned int reserved4;
	unsigned int reserved5;
	unsigned int reserved6;

	unsigned int palette_offset;	// 0 = no palette
	unsigned int texname_offset;

	unsigned short tex_width;
	unsigned short tex_height;

	T_HMTFILE_TEXTURE_FORMAT tex_format;
} T_HMTFILE_TEXTURE_HEADER;

typedef struct PACK hmtfile_image_attributes {
	unsigned short width;		// Must be increased to a multiple of 2 if odd.
	unsigned short height;

	unsigned char reserved0;	// 0x01

	unsigned char bit_per_pixel;	// 0 - 4bits / 1 - 8bits
	unsigned char subtype;			// 3 - RGBA / 4 - greyscale / 5 - ov_rdir
	unsigned char reserved1;	// 0x80/128
} T_HMTFILE_IMAGE_ATTRIBUTES;

typedef struct PACK hmtfile_image {
	unsigned int data_size;
	unsigned int pixels_offset;

	unsigned int reserved0;		// 32B zeros
	unsigned int reserved1;
	unsigned int reserved2;
	unsigned int reserved3;
	unsigned int reserved4;
	unsigned int reserved5;
	unsigned int reserved6;
	unsigned int reserved7;

	unsigned int desc_offset;

	T_HMTFILE_IMAGE_ATTRIBUTES attributes;

	unsigned int transparent_color;		//TODO: replace by T_PIXEL type
	unsigned int unknown0;
} T_HMTFILE_IMAGE;

typedef struct PACK hmtfile_texture {
	unsigned char name[16];			// Normally = material name
	unsigned int RGB_palette;		//TODO: to define
	unsigned int pixels_samples;	//TODO: to define
} T_HMTFILE_TEXTURE;

#if defined(_MSC_VER)
#pragma pack(pop)
#endif

#endif /* RSPTEXTURELIB_HMT_STRUCT_H_ */