mirror of https://github.com/axmolengine/axmol.git
65 lines
2.3 KiB
C++
65 lines
2.3 KiB
C++
/******************************************************************************
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ASTC Texture Decompression.
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******************************************************************************/
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#include "base/astc.h"
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#include "astc/astcenc.h"
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#include "astc/astcenc_internal.h"
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uint8_t astc_decompress_image(
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const uint8_t* in, uint32_t inlen, uint8_t* out, uint32_t dim_x, uint32_t dim_y, uint32_t block_x, uint32_t block_y) {
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static std::once_flag once_flag;
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std::call_once(once_flag, init_quant_mode_table);
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const unsigned int dim_z = 1;
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const unsigned int block_z = 1;
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unsigned int xblocks = (dim_x + block_x - 1) / block_x;
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unsigned int yblocks = (dim_y + block_y - 1) / block_y;
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unsigned int zblocks = (dim_z + block_z - 1) / block_z;
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int row_blocks = xblocks;
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int plane_blocks = xblocks * yblocks;
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// Check we have enough output space (16 bytes per block)
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size_t size_needed = xblocks * yblocks * zblocks * 16;
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if (inlen < size_needed) {
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return ASTCENC_ERR_OUT_OF_MEM;
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}
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block_size_descriptor* bsd = new block_size_descriptor(); // 3.3MB
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init_block_size_descriptor(block_x, block_y, 1, false, 0 /*unused for decompress*/, *bsd);
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image_block blk;
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void* data[1] = {out};
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astcenc_image image_out{dim_x, dim_y, 1, ASTCENC_TYPE_U8, data};
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const auto total_blocks = zblocks * yblocks * xblocks;
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const astcenc_swizzle swz_decode{ASTCENC_SWZ_R, ASTCENC_SWZ_G, ASTCENC_SWZ_B, ASTCENC_SWZ_A};
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for (unsigned int i = 0; i < total_blocks; ++i) {
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// Decode i into x, y, z block indices
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int z = i / plane_blocks;
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unsigned int rem = i - (z * plane_blocks);
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int y = rem / row_blocks;
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int x = rem - (y * row_blocks);
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unsigned int offset = (((z * yblocks + y) * xblocks) + x) * 16;
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const uint8_t* bp = in + offset;
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physical_compressed_block pcb = *(const physical_compressed_block*) bp;
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symbolic_compressed_block scb;
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physical_to_symbolic(*bsd, pcb, scb);
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decompress_symbolic_block(ASTCENC_PRF_LDR_SRGB, *bsd, x * block_x, y * block_y, z * block_z, scb, blk);
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write_image_block(image_out, blk, *bsd, x * block_x, y * block_y, z * block_z, swz_decode);
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}
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term_block_size_descriptor(*bsd);
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delete bsd;
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return ASTCENC_SUCCESS;
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}
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