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83 lines
3.0 KiB
C
83 lines
3.0 KiB
C
// File: bc7enc.h - Richard Geldreich, Jr. - MIT license or public domain (see end of bc7enc.c)
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#include <stdlib.h>
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#include <stdint.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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#define BC7ENC_BLOCK_SIZE (16)
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#define BC7ENC_MAX_PARTITIONS1 (64)
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#define BC7ENC_MAX_UBER_LEVEL (4)
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typedef uint8_t bc7enc_bool;
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#define BC7ENC_TRUE (1)
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#define BC7ENC_FALSE (0)
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typedef struct
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{
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// m_max_partitions_mode may range from 0 (disables mode 1) to BC7ENC_MAX_PARTITIONS1. The higher this value, the slower the compressor, but the higher the quality.
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uint32_t m_max_partitions_mode;
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// Relative RGBA or YCbCrA weights.
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uint32_t m_weights[4];
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// m_uber_level may range from 0 to BC7ENC_MAX_UBER_LEVEL. The higher this value, the slower the compressor, but the higher the quality.
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uint32_t m_uber_level;
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// If m_perceptual is true, colorspace error is computed in YCbCr space, otherwise RGB.
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bc7enc_bool m_perceptual;
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// Set m_try_least_squares to false for slightly faster/lower quality compression.
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bc7enc_bool m_try_least_squares;
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// When m_mode_partition_estimation_filterbank, the mode1 partition estimator skips lesser used partition patterns unless they are strongly predicted to be potentially useful.
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// There's a slight loss in quality with this enabled (around .08 dB RGB PSNR or .05 dB Y PSNR), but up to a 11% gain in speed depending on the other settings.
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bc7enc_bool m_mode_partition_estimation_filterbank;
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bc7enc_bool m_use_mode5_for_alpha;
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bc7enc_bool m_use_mode7_for_alpha;
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} bc7enc_compress_block_params;
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inline void bc7enc_compress_block_params_init_linear_weights(bc7enc_compress_block_params *p)
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{
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p->m_perceptual = BC7ENC_FALSE;
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p->m_weights[0] = 1;
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p->m_weights[1] = 1;
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p->m_weights[2] = 1;
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p->m_weights[3] = 1;
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}
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inline void bc7enc_compress_block_params_init_perceptual_weights(bc7enc_compress_block_params *p)
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{
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p->m_perceptual = BC7ENC_TRUE;
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p->m_weights[0] = 128;
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p->m_weights[1] = 64;
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p->m_weights[2] = 16;
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p->m_weights[3] = 32;
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}
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inline void bc7enc_compress_block_params_init(bc7enc_compress_block_params *p)
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{
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p->m_max_partitions_mode = BC7ENC_MAX_PARTITIONS1;
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p->m_try_least_squares = BC7ENC_TRUE;
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p->m_mode_partition_estimation_filterbank = BC7ENC_TRUE;
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p->m_uber_level = 0;
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p->m_use_mode5_for_alpha = BC7ENC_TRUE;
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p->m_use_mode7_for_alpha = BC7ENC_TRUE;
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bc7enc_compress_block_params_init_perceptual_weights(p);
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}
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// bc7enc_compress_block_init() MUST be called before calling bc7enc_compress_block() (or you'll get artifacts).
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void bc7enc_compress_block_init();
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// Packs a single block of 16x16 RGBA pixels (R first in memory) to 128-bit BC7 block pBlock, using either mode 1 and/or 6.
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// Alpha blocks will always use mode 6, and by default opaque blocks will use either modes 1 or 6.
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// Returns BC7ENC_TRUE if the block had any pixels with alpha < 255, otherwise it return BC7ENC_FALSE. (This is not an error code - a block is always encoded.)
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bc7enc_bool bc7enc_compress_block(void *pBlock, const void *pPixelsRGBA, const bc7enc_compress_block_params *pComp_params);
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#ifdef __cplusplus
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}
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#endif
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