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libavcodec/texturedspenc : add rgtc1_u_alpha encoding func

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this func encode the alpha channel of the rgba input
to an rgtc1u block

Signed-off-by: Tom Butterworth <bangnoise@gmail.com>
This commit is contained in:
Martin Vignali 2017-09-28 21:37:46 +02:00 committed by Tom Butterworth
parent d4d4629dfe
commit 50a20de6b9
1 changed files with 17 additions and 0 deletions
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17
libavcodec/texturedspenc.c
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@ -647,9 +647,26 @@ static int dxt5ys_block(uint8_t *dst, ptrdiff_t stride, const uint8_t *block)
return 16;
}
/**
* Compress one block of RGBA pixels in a RGTC1U texture and store the
* resulting bytes in 'dst'. Use the alpha channel of the input image.
*
* @param dst output buffer.
* @param stride scanline in bytes.
* @param block block to compress.
* @return how much texture data has been written.
*/
static int rgtc1u_alpha_block(uint8_t *dst, ptrdiff_t stride, const uint8_t *block)
{
compress_alpha(dst, stride, block);
return 8;
}
av_cold void ff_texturedspenc_init(TextureDSPContext *c)
{
c->dxt1_block = dxt1_block;
c->dxt5_block = dxt5_block;
c->dxt5ys_block = dxt5ys_block;
c->rgtc1u_alpha_block = rgtc1u_alpha_block;
}