Databases
StackOverflow2013
Postsdbo
POOpenGL textures: why does order matter?
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POOpenGL textures: why does order matter?
    primarykey
    data
    text
    <p>I am trying to setup a simple function which will make it a lot easier for me to texture map geometry in OpenGL, but for some reason when I'm trying to make a skybox, I am getting a white box instead of the texture mapped geometry. I think that the problemed code lies within the following:</p> <pre><code>void MapTexture (char *File, int TextNum) { if (!TextureImage[TextNum]){ TextureImage[TextNum]=auxDIBImageLoad(File); glGenTextures(1, &amp;texture[TextNum]); glBindTexture(GL_TEXTURE_2D, texture[TextNum]); glTexImage2D(GL_TEXTURE_2D, 0, 3, TextureImage[TextNum]-&gt;sizeX, TextureImage[TextNum]-&gt;sizeY, 0, GL_RGB, GL_UNSIGNED_BYTE, TextureImage[TextNum]-&gt;data); glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR); } glEnable(GL_TEXTURE_2D); glBindTexture(GL_TEXTURE_2D, texture[TextNum]); //glTexImage2D(GL_TEXTURE_2D, 0, 3, TextureImage[TextNum]-&gt;sizeX, TextureImage[TextNum]-&gt;sizeY, 0, GL_RGB, GL_UNSIGNED_BYTE, TextureImage[TextNum]-&gt;data); //glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR); } </code></pre> <p>The big thing I don't understand is for some reason the <code>glBindTexture()</code> must come between <code>glGenTextures()</code> and <code>glTexImage2D</code>. If I place it anywhere else, it screws everything up. What could be causing this problem? Sorry if it's something simple, I'm brand new to openGL.</p> <p>Below is a screenshot of the whitebox I am talking about: <img src="https://i.stack.imgur.com/V8OdQ.png" alt="enter image description here"></p> <p>+++++++++++++++++++++++++++++++ EDIT +++++++++++++++++++++++++++++++</p> <p>After playing around with the code a bit more, i realized that if I added <code>glTexImage2D()</code> and <code>glTexParameteri()</code>after the last <code>glBindTexture()</code> then all the textures load. Why is it that without these two lines most textures would load, and yet there are a few that would not, and why do I have to call glTexImage() for every frame, but only for a few textures? </p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USSean
    1. USSean
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POOpenGL textures: why does order matter?
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POOpenGL textures: why does order matter?
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. POOpenGL textures: why does order matter?
      1. USzenzelezz
      1. VTFavorite
    1. CO"auxDIBImageLoad" Please don't use `GLaux` ever. If you need image loading, there are [many actually good libraries for it](http://www.opengl.org/wiki/Image_Libraries).
      singulars
      1. POOpenGL textures: why does order matter?
      1. USNicol Bolas
    2. COThe reason I asked this was actually primarily because I am getting this white box when I try and load a texture, and I thought it might have been something to do with the ordering of the functions, but it appears that is not so. What else could be causing this white box to appear?
      singulars
      1. POOpenGL textures: why does order matter?
      1. USSean
    3. COI thought it had something to do with the order because if I were to remove `if (!TextureImage[TextNum])` then the texture will appear, but considering the fact that `MapTexture()` is called every time the frame is rendered, without `if (!TextureImage[TextNum])` the memory leaks like crazy until the program crashes.
      singulars
      1. POOpenGL textures: why does order matter?
      1. USSean
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload