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#ifndef ETC2DECOMPRESSION_H
#define ETC2DECOMPRESSION_H
#include "UnityPrefix.h"
// ETC-2 decompressor
//
// Input is expected to be in standard ETC-2 (+EAC) memory layout. In ETC2 block size is 64b
// and alpha EAC block adds another 64b.
//
// Output must be RGBA with 8 bits for each channel, stored in R, G, B, A order
// (from offset 0 to 3).
//
// Texture sizes that are not exactly divisible by block size are supported. In such
// case block count is rounded up and extra decoded pixels are just ignored.
//! ETC2 memory layout configuration
enum
{
kETC2BlockWidth = 4,
kETC2BlockHeight = 4,
kETC2UncompressedPixelSizeA8 = 1,
kETC2UncompressedPixelSizeRGB8 = 3,
kETC2UncompressedPixelSizeRGBA8 = 4,
kETC2UncompressedBlockSizeA8 = kETC2BlockWidth*kETC2BlockHeight*kETC2UncompressedPixelSizeA8,
kETC2UncompressedBlockSizeRGB8 = kETC2BlockWidth*kETC2BlockHeight*kETC2UncompressedPixelSizeRGB8,
kETC2UncompressedBlockSizeRGBA8 = kETC2BlockWidth*kETC2BlockHeight*kETC2UncompressedPixelSizeRGBA8
};
//! Decompress ETC2 to RGBA8 buffer
void DecompressETC2_RGB8 (UInt8* dst, const UInt8* src, int width, int height);
//! Decompress ETC2 with punchthrough alpha to RGBA8 buffer
void DecompressETC2_RGB8_A1 (UInt8* dst, const UInt8* src, int width, int height);
//! Decompress ETC2+EAC to RGBA8 buffer
void DecompressETC2_RGBA8 (UInt8* dst, const UInt8* src, int width, int height);
#endif
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