Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

Change equation of alpha blending #1042

Open
bvssvni opened this issue Apr 21, 2016 · 0 comments
Open

Change equation of alpha blending #1042

bvssvni opened this issue Apr 21, 2016 · 0 comments
Labels
discussion draft

Comments

@bvssvni
Copy link
Member

bvssvni commented Apr 21, 2016

Currently, the equation for alpha blending is (taken from Gfx):

new_dest_alpha = src_alpha + dest_alpha

Glium uses new_dest_alpha = src_alpha * src_alpha + dest_alpha * (1 - src_alpha).

According to https://en.wikipedia.org/wiki/Alpha_compositing, both equations are incorrect. The correct equation for alpha is:

new_dest_alpha = src_alpha + dest_alpha * (1 - src_alpha)
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Assignees
No one assigned
Labels
discussion draft
Projects
None yet
Milestone
No milestone
Development

No branches or pull requests
1 participant
@bvssvni