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Add more notes for future optimization

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Andrew Cassidy 2021-02-21 16:27:43 -08:00
parent d21798d4a4
commit d0f8272fa5
1 changed files with 2 additions and 1 deletions
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src/BC1/BC1Encoder.cpp
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@ -340,7 +340,8 @@ void BC1Encoder::FindEndpoints(Color4x4 pixels, BC1Encoder::Flags flags, const B
if (covariance[0][2] < 0) delta[0] = -delta[0]; // r vs b
if (covariance[1][2] < 0) delta[1] = -delta[1]; // g vs b
// using the covariance matrix, iteratively stretch the delta vector towards the primary axis of the data
// using the covariance matrix, stretch the delta vector towards the primary axis of the data using power iteration
// the end result of this may actually be the same as the least squares approach, will have to do more research
for (unsigned power_iter = 0; power_iter < total_power_iters; power_iter++) { delta = covariance * delta; }
// if we found any correlation, then this is our new axis. otherwise we fallback to the luma vector