Use alfa bug #41386

Closed
opened 2014-08-10 19:01:24 +02:00 by Alexey · 12 comments

System Information
windows7 64
ASUS ATI Radeon HD6870

Blender Version
Broken: (2.67 - 2.713(ee8dafe)and(3d4f540))
Worked: (2.66(r54697) and all earlyer)

Short description of error
Create a UV map(in edit mode) with image(maybe without material, texture, using anywhere)
size of this image - is not important
32 bit float - bug active too, but not so visible
we must switch off use alfa on this image

go to tex paint mode, set strenght to maximum, select erase alfa(brush blanding mode), try to paint anything
select a mix (brush blanding mode) and try to paint anything(and we will see paint incorrect)

Exact steps for others to reproduce the error
1)Open file{F102300}
2)Select erase alfa, paint anything
3)Select mix, try to paint anything(painting incorrect)

in render (Cycles or BI) all properly
this bug only in 3d view
in GLSL mode - working without bug
alfa_bug.png

**System Information** windows7 64 ASUS ATI Radeon HD6870 **Blender Version** Broken: (2.67 - 2.713(ee8dafe)and(3d4f540)) Worked: (2.66(r54697) and all earlyer) **Short description of error** Create a UV map(in edit mode) with image(maybe without material, texture, using anywhere) size of this image - is not important 32 bit float - bug active too, but not so visible we must switch off use alfa on this image go to tex paint mode, set strenght to maximum, select erase alfa(brush blanding mode), try to paint anything select a mix (brush blanding mode) and try to paint anything(and we will see paint incorrect) **Exact steps for others to reproduce the error** 1)Open file{[F102300](https://archive.blender.org/developer/F102300/alfa_bug.blend)} 2)Select erase alfa, paint anything 3)Select mix, try to paint anything(painting incorrect) in render (Cycles or BI) all properly this bug only in 3d view in GLSL mode - working without bug ![alfa_bug.png](https://archive.blender.org/developer/F102317/alfa_bug.png)
Author

Changed status to: 'Open'

Changed status to: 'Open'
Alexey self-assigned this 2014-08-10 19:01:24 +02:00
Author

Added subscriber: @Inwader77

Added subscriber: @Inwader77
Alexey was unassigned by Bastien Montagne 2014-08-10 20:02:08 +02:00
Author

I was grab this? I looked on all reports - don't find any similar

I was grab this? I looked on all reports - don't find any similar
Antonis Ryakiotakis was assigned by Sergey Sharybin 2014-08-11 10:20:17 +02:00

Added subscribers: @Psy-Fi, @Sergey

Added subscribers: @Psy-Fi, @Sergey

@Psy-Fi, mind having a look?

@Psy-Fi, mind having a look?

@Sergey I know this already, this is straight alpha on byte images that has come to bite us on the nose :/. We could premultiply before uploading on GPU but it will result in perfomance loss. It might be considered todo until we support dedicated texpainting color space?. Not sure how to handle this..

@Sergey I know this already, this is straight alpha on byte images that has come to bite us on the nose :/. We could premultiply before uploading on GPU but it will result in perfomance loss. It might be considered todo until we support dedicated texpainting color space?. Not sure how to handle this..

@Psy-Fi, is it possible to resolve using different glBlend function for byte images or it'll also effect on the other textures?

@Psy-Fi, is it possible to resolve using different glBlend function for byte images or it'll also effect on the other textures?

Hmmm, might be, since I'm using register combiners in the drawing code to combine the result there for byte images.

Hmmm, might be, since I'm using register combiners in the drawing code to combine the result there for byte images.

Added subscriber: @mont29

Added subscriber: @mont29

This issue was referenced by ba345bcbb6

This issue was referenced by ba345bcbb6de5f32ba8ae3e9666077c707d10764

Changed status from 'Open' to: 'Resolved'

Changed status from 'Open' to: 'Resolved'

Closed by commit ba345bcbb6.

Closed by commit ba345bcbb6.
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Reference: blender/blender#41386
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