GPU Pro 5

318 IV Mobile Devices

struct astc_header

{

uint8_t magic [4];

uint8_t blockdim_x ;

uint8_t blockdim_y ;

uint8_t blockdim_z ;

uint8_t xsize [3];

uint8_t ysize [3];

uint8_t zsize [3];

};

Listing 6.1. ASTC header structure.

texture formats and as such can be used to test ASTC-based programs on a

standard desktop GPU.

Loading a texture in ASTC format is no different from loading other com-

pressed texture formats, but the correct internal format must be used. Files

output by the compressor have a data header containing everything needed to

load the compressed texture.

Using the data structure in Listing 6.1, the application can detect the impor-

tant information