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adding channel weights comment

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Richard Geldreich
2026-07-05 21:37:48 -04:00
parent 20ed781c4b
commit 0f540010c5
1 changed files with 4 additions and 0 deletions
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encoder/basisu_xbc7_encode.h
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@@ -29,6 +29,10 @@ namespace xbc7 {
struct pack_options
{
uint32_t m_dct_q = 100; // [1,100]; 100 == lossless mode (weights always residual DPCM)
// Per-channel error weights. ALWAYS used by the XBC7 encoder when evaluating block candidates vs. the
// original pixels during supercompression, regardless of the BC7 base encoder. (The base encoders differ:
// bc7f supports neither weights nor perceptual; bc7e_scalar supports either - see m_perceptual below.)
uint32_t m_weights[4] = { 1, 1, 1, 1 };
// Encoder effort/speed knob [0,10]: 0 == fastest, 10 == slowest/best