mirror of https://github.com/axmolengine/axmol.git
55 lines
1.6 KiB
C
55 lines
1.6 KiB
C
/******************************************************************************
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ASTC Texture Decompression.
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astc compression tool: https://github.com/ARM-software/astc-encoder/releases
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version required: v2.2+
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command:
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astcenc-sse4.2 -cl test1.png test1.astc 6x6 -medium -pp-premultiply
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******************************************************************************/
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#ifndef __ASTC_H__
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#define __ASTC_H__
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#include <stdint.h>
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// ASTC parameters
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#define ASTC_HEAD_SIZE 16
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/* ============================================================================
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ASTC compressed file loading, see also: astcenccli_image_load_store.cpp
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============================================================================ */
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struct astc_header
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{
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uint8_t magic[4];
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uint8_t block_x;
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uint8_t block_y;
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uint8_t block_z;
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uint8_t dim_x[3]; // dims = dim[0] + (dim[1] << 8) + (dim[2] << 16)
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uint8_t dim_y[3]; // Sizes are given in texels;
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uint8_t dim_z[3]; // block count is inferred
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};
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static const uint32_t ASTC_MAGIC_ID = 0x5CA1AB13;
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static unsigned int astc_unpack_bytes(uint8_t a, uint8_t b, uint8_t c, uint8_t d)
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{
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return ((unsigned int)(a)) + ((unsigned int)(b) << 8) + ((unsigned int)(c) << 16) + ((unsigned int)(d) << 24);
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}
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#ifdef __cplusplus
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extern "C" {
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#endif
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int astc_decompress_image(const uint8_t* in,
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uint32_t inlen,
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uint8_t* out,
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uint32_t xdim,
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uint32_t ydim,
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uint32_t xblock,
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uint32_t yblock);
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#ifdef __cplusplus
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} // extern "C"
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#endif
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#endif //__ASTC_H__
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