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| − | {{RW Section|Struct|0x0001}} | + | {{request-delete}} |
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| − | ''This article is about the [[Struct (RW Section)|Struct]] section accompanied by a [[Texture Native (RW Section)|Texture Native]] parent section.''
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| − | The '''Texture Native Struct''' section can usually be found in [[texture archive]]s used by the PC and XBOX versions of the GTA III game trilogy. They are the most important sections inside a <code>.txd</code> file since they contain the names, dimensions and the actual image data for textures. The typical location in the file's section hierarchy is ''[[Texture Dictionary (RW Section)|Texture Dictionary]] > [[Texture Native (RW Section)|Texture Native]] > Struct''.
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| − | ==Images Header==
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| − | There is a ''86 byte'' header with general image information:
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| − | struct NativeTexturePC_Header
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| − | {
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| − | struct {
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| − | unsigned int platformId;
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| − | unsigned int filterMode : 8;
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| − | unsigned int uAddressing : 4;
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| − | unsigned int vAddressing : 4;
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| − | char name[32];
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| − | char maskName[32];
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| − | } TextureFormat;
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| − | struct {
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| − | unsigned int rasterFormat;
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| − | union {
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| − | D3DFORMAT d3dFormat; // SA
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| − | unsigned int hasAlpha // GTA3 & VC
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| − | };
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| − | unsigned short width;
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| − | unsigned short height;
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| − | unsigned char depth;
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| − | unsigned char numLevels;
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| − | unsigned char rasterType;
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| − | union {
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| − | unsigned char compression; // GTA3 & VC
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| − | struct { // SA
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| − | unsigned char alpha : 1;
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| − | unsigned char cubeTexture : 1;
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| − | unsigned char autoMipMaps : 1;
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| − | unsigned char compressed : 1;
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| − | };
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| − | };
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| − | } RasterFormat;
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| − | };
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| − | ;Platform ID: This is '''8''' for GTA3 and VC on the PC, '''9''' for GTA SA on the PC, and '''5''' for GTA3/VC/SA on the XBOX.
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| − | ;Filter Flags:
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| − | FILTER_NONE 0x00
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| − | FILTER_NEAREST 0x01
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| − | FILTER_LINEAR 0x02
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| − | FILTER_MIP_NEAREST 0x03
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| − | FILTER_MIP_LINEAR 0x04
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| − | FILTER_LINEAR_MIP_NEAREST 0x05
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| − | FILTER_LINEAR_MIP_LINEAR 0x06
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| − | FILTER_??? 0x1101
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| − | ;Texture Wrap:
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| − | WRAP_NONE 0x00
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| − | WRAP_WRAP 0x01
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| − | WRAP_MIRROR 0x02
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| − | WRAP_CLAMP 0x03
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| − | ;Raster Format:
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| − | FORMAT_DEFAULT 0x0000
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| − | FORMAT_1555 0x0100 (1 bit alpha, RGB 5 bits each; also used for DXT1 with alpha)
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| − | FORMAT_565 0x0200 (5 bits red, 6 bits green, 5 bits blue; also used for DXT1 without alpha)
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| − | FORMAT_4444 0x0300 (RGBA 4 bits each; also used for DXT3)
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| − | FORMAT_LUM8 0x0400 (gray scale)
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| − | FORMAT_8888 0x0500 (RGBA 8 bits each)
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| − | FORMAT_888 0x0600 (RGB 8 bits each)
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| − | FORMAT_555 0x0A00 (RGB 5 bits each - rare, use 565 instead)
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| − |
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| − | FORMAT_EXT_AUTO_MIPMAP 0x1000 (RW generates mipmaps)
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| − | FORMAT_EXT_PAL8 0x2000 (2^8 = 256 palette colors)
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| − | FORMAT_EXT_PAL4 0x4000 (2^4 = 16 palette colors)
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| − | FORMAT_EXT_MIPMAP 0x8000 (mipmaps included)
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| − | ;depth: 8, 16 or 32; 8 usually comes with palette
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| − | ;Compression: for more information, refer to [[Wikipedia:S3 Texture Compression|S3 Texture Compression]].
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| − | ==Raster Data==
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| − | The header is followed by an optional palette and the raster data (pixels), according to the Raster Format flags.
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| − | If Raster Format is <code>FORMAT_EXT_PAL8 | FORMAT_8888</code> or <code>FORMAT_EXT_PAL8 | FORMAT_888</code>, then a ''color palette'' of (up to) 256 RGBA colors is included. This is used in GTA3 quite often. The raster's one byte for each pixel is an index into the palette.
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| − | 1024 byte - BYTE[256][4] - palette of RGBA colors
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| − | 4 byte - DWORD - raster size
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| − | w*h*1 byte - BYTE[w*h] - pixels, 1 byte each
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| − | If no palette is included, the header is followed by raster size and data. If ''[[Wikipedia:mipmap|mipmap]]s'' are included (<code>FORMAT_EXT_MIPMAP</code>) then this is repeated for each mipmap. With increasing mipmap levels the raster size is decreased by the factor 4 (side lengths halved). Small initial textures can result in mipmaps of the size 0. For ''uncompressed'' images:
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| − | 4 byte - DWORD - raster size
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| − | w*h*bpp/8 byte - BYTE[w*h][bpp/8] - pixels
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| − | '''Note:''' FORMAT_888(8) rasters use BGRA colors!
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| − | If DXT compression is used, blocks of 4x4 pixels occupy only 8 or 16 bytes (depending on the type).
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