Hi !
Featured games (87)
games approved by the League of Dukes
Games in Showcase (671)
Games in Android Showcase (194)
games submitted by our members
Games in WIP (727)
games currently in development
News: Read the Java Gaming Resources, or peek at the official Java tutorials
    Home     Help   Search   Login   Register   
Pages: [1]
  ignore  |  Print  
  libGDX shaders - ignoring transparent pixels  (Read 1311 times)
0 Members and 1 Guest are viewing this topic.
Offline boolean

Junior Devvie

Medals: 1
Projects: 1

« Posted 2013-10-31 03:56:02 »

This is probably a silly question. I've tried to read up on shaders but I think I'm still a class-A bafoon  Undecided

I have a sprite in my game of a pretty large castle wall. Right now for my fire and poison effects I have complete copies of the sprites with gradients applied. It seems like a pretty large waste of space for just a gradient.

I've found some shaders that I can apply to my sprite to make a gradient, but I can't seem to skip transparent pixels. When I apply it I just get a big gradient rectangle. If I want to apply a gradient or effect to my texture, is there a way to ignore transparent pixels?

The one tutorial I found that seems to achieve this only works on GL10  Sad

Offline Longarmx
« Reply #1 - Posted 2013-10-31 03:57:42 »

You just multiply by the gradient color in your fragment shader.

Offline Danny02
« Reply #2 - Posted 2013-10-31 08:47:48 »

yes and don't change the alpha value of the texture in the shader^^
Games published by our own members! Check 'em out!
Legends of Yore - The Casual Retro Roguelike
Offline lukasz1985

Senior Newbie

« Reply #3 - Posted 2013-10-31 10:47:08 »

Use "discard" keyword in your fragment shader.
Offline Danny02
« Reply #4 - Posted 2013-10-31 11:12:06 »

you probably should not use discard. Blending is the preferred choice for 99% of all cases. Depending on the hardware using discard can have very bad properties for the performance.

So unless you understand in depth how using discard would impact what you are doing, just don't use it.
Offline boolean

Junior Devvie

Medals: 1
Projects: 1

« Reply #5 - Posted 2013-11-02 13:03:59 »

Very cool, thanks for the feedback. I'll look into blending and see what I can come up with.  Smiley
Pages: [1]
  ignore  |  Print  
You cannot reply to this message, because it is very, very old.

IanParcs (45 views)
2016-04-18 14:18:53

KaiHH (45 views)
2016-04-18 08:35:41

KaiHH (75 views)
2016-04-15 12:43:58

theagentd (76 views)
2016-04-14 02:16:17

theagentd (90 views)
2016-04-14 02:15:43

IanParcs (104 views)
2016-04-12 03:51:16

IanParcs (47 views)
2016-04-12 03:50:03

IanParcs (43 views)
2016-04-12 03:49:54

IanParcs (38 views)
2016-04-12 03:49:52

IanParcs (48 views)
2016-04-12 03:49:52
Website offering 3D Models specifically for games for free
by vusman
2016-04-29 12:56:17

List of Learning Resources
by SilverTiger
2016-02-05 09:39:47

List of Learning Resources
by SilverTiger
2016-02-05 09:38:38

List of Learning Resources
by SilverTiger
2016-02-05 09:35:50

Rendering resources
by Roquen
2015-11-13 14:37:59

Rendering resources
by Roquen
2015-11-13 14:36:58

Math: Resources
by Roquen
2015-10-22 07:46:10

Networking Resources
by Roquen
2015-10-16 07:12:30 is not responsible for the content posted by its members, including references to external websites, and other references that may or may not have a relation with our primarily gaming and game production oriented community. inquiries and complaints can be sent via email to the info‑account of the company managing the website of java‑
Powered by MySQL Powered by PHP Powered by SMF 1.1.18 | SMF © 2013, Simple Machines | Managed by Enhanced Four Valid XHTML 1.0! Valid CSS!