drewcassidy/quicktex
1
0
Fork 0
mirror of https://github.com/drewcassidy/quicktex.git synced 2024-06-11 06:04:05 +00:00
Code Issues Projects Releases Activity

Add more notes for future optimization

Browse Source
This commit is contained in:
Andrew Cassidy 2021-02-21 16:27:43 -08:00
parent d21798d4a4
commit d0f8272fa5
1 changed files with 2 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
src/BC1/BC1Encoder.cpp
View File

@ -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