Hi !
Featured games (91)
games approved by the League of Dukes
Games in Showcase (757)
Games in Android Showcase (229)
games submitted by our members
Games in WIP (844)
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  
  What does this code in a textureloader do?  (Read 3497 times)
0 Members and 1 Guest are viewing this topic.
Offline Glass

Senior Newbie

« Posted 2012-03-26 03:10:50 »

      GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_WRAP_S, GL12.GL_CLAMP_TO_EDGE);
      GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_WRAP_T, GL12.GL_CLAMP_TO_EDGE);


I saw this code being used after a texture ID was generated and bound, and before the texture ID is returned to where it'll be rendered. Whatever it is, it works, and the texture doesn't show without it. Can someone please explain what it means? I'd rather not use it without knowing what it actually is.
Offline davedes
« Reply #1 - Posted 2012-03-26 04:37:10 »

The first two lines describe how to handle texture coordinates outside of the range [0 - 1], and the following two lines describe how to handle filtering on minification (scaling down) and magnification (scaling up). The example here uses "nearest neighbour" filtering which means hard edges will be preserved (i.e. nice for "8bit retro" effect). An alternative would be GL_LINEAR which results in a smoother scaling.

Since texture wrap uses GL_CLAMP_TO_EDGE (notice it requires OpenGL 1.2), texcoords outside of the [0-1] range will use the nearest edge color.

You can change these parameters after creating your texture, e.g. if you wanted to change the filtering.

As for why the texture won't show without this code -- that's because, by default, the minification filter expects mipmaps, and since you haven't defined/generated any, the texture will be invalid (and thus won't render). If you aren't using mipmaps, then you need to use GL_NEAREST or GL_LINEAR for your min/mag filters.

More info:

Offline gimbal

JGO Knight

Medals: 26

« Reply #2 - Posted 2012-03-30 09:44:06 »

Wow, flipcode. Now those were the days. Really sad that the site closed down Sad
Pages: [1]
  ignore  |  Print  

EgonOlsen (76 views)
2018-06-10 19:43:48

EgonOlsen (56 views)
2018-06-10 19:43:44

EgonOlsen (76 views)
2018-06-10 19:43:20

DesertCoockie (258 views)
2018-05-13 18:23:11

nelsongames (156 views)
2018-04-24 18:15:36

nelsongames (155 views)
2018-04-24 18:14:32

ivj94 (896 views)
2018-03-24 14:47:39

ivj94 (160 views)
2018-03-24 14:46:31

ivj94 (809 views)
2018-03-24 14:43:53

Solater (173 views)
2018-03-17 05:04:08
Java Gaming Resources
by philfrei
2017-12-05 19:38:37

Java Gaming Resources
by philfrei
2017-12-05 19:37:39

Java Gaming Resources
by philfrei
2017-12-05 19:36:10

Java Gaming Resources
by philfrei
2017-12-05 19:33:10

List of Learning Resources
by elect
2017-03-13 14:05:44

List of Learning Resources
by elect
2017-03-13 14:04:45

SF/X Libraries
by philfrei
2017-03-02 08:45:19

SF/X Libraries
by philfrei
2017-03-02 08:44:05 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!