mmp

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Format: MMP

Description

Packed texture file with MIP-map support

Structure

File contain one header with this structure:

struct Header
{
    uint magic; // 4D 4D 50 00
    
    uint width;
    uint height;
    
    uint mip_count;
    uint format;
    uint bit_count;
    
    struct Channel a_format, r_format, g_format, b_format;

    uint offset
};

a_format, r_format, g_format, b_format - specification of ARGB pixel structure:

struct Channel
{
    uint mask;
    uint shift;
    uint count;
};

format value can be one of this:

format	description
44 44 00 00	ARGB4
44 58 54 31	DXT1
44 58 54 33	DXT3
50 4E 54 33	PNT3 - RLE encoded ARGB8
50 56 00 00	R5G5B5
51 55 00 00	A1R5G5B5
88 88 00 00	ARGB8

After header lay image data: zero mip level, second etc.

Additional information

If format of image is PNT3, pixel structure equal to 0; bit_count = compressed image size in bytes. Uncompressed size is 4 * H * W.

PNT3 decoding:
if uint number is 0 or 1000000, skip this 4 bytes and increase count, else copy count bytes and reset counter.