ASTC实时压缩

ASTC实时编码器，LDR RGB/RGBA 支持透明通道

快速编码，是arm-astc fast的100倍
质量尚可
Block4x4
single partition
带alpha为QUANT_6, QUANT_256，不带alpha为QUANT_12, QUANT_256
参考：
https://github.com/daoo/astcrt
https://github.com/ARM-software/astc-encoder

Name		Name	Last commit message	Last commit date
Latest commit History 34 Commits
.gitignore		.gitignore
README.md		README.md
bitmanip.h		bitmanip.h
colors.h		colors.h
compress_block.cpp		compress_block.cpp
compress_block.h		compress_block.h
compress_texture.cpp		compress_texture.cpp
compress_texture.h		compress_texture.h
constants.h		constants.h
data_size.h		data_size.h
dcheck.h		dcheck.h
endpoints.h		endpoints.h
endpoints_encode.h		endpoints_encode.h
endpoints_min_max.h		endpoints_min_max.h
endpoints_principal_components.h		endpoints_principal_components.h
endpoints_quantize.h		endpoints_quantize.h
integer_sequence_encoding.h		integer_sequence_encoding.h
matrix.h		matrix.h
misc.h		misc.h
range.h		range.h
store_block.h		store_block.h
tables_color_quantization.h		tables_color_quantization.h
tables_data_size.h		tables_data_size.h
tables_integer_sequence_encoding.h		tables_integer_sequence_encoding.h
test.cpp		test.cpp
vector.h		vector.h
weights_quantize.h		weights_quantize.h
weights_quantize_table.h		weights_quantize_table.h

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