Textures not loading correctly?

Question

Im trying to show some textures in my program, and I have this code thats used to load bitmaps into openGL textures:

void LoadGLTextures()
{
  // Bitmap handle and structure
  HBITMAP hBMP;
  BITMAP  BMP;

  // Generate list of textures from resources
  byte Texture[] = {IDB_FONT, IDB_SKIN, IDB_PIANO};
  glGenTextures(sizeof(Texture), &texture[0]);

   // Iterate through texture list and load bitmaps
  for (int loop=0; loop<sizeof(Texture); loop++)
  {
    hBMP = (HBITMAP)LoadImage(GetModuleHandle(NULL), MAKEINTRESOURCE(Texture[loop]),
                          IMAGE_BITMAP, 0, 0, LR_CREATEDIBSECTION);
    if (hBMP)
    {
     GetObject(hBMP,sizeof(BMP), &BMP);
     glPixelStorei(GL_UNPACK_ALIGNMENT,4);
     glBindTexture(GL_TEXTURE_2D, texture[loop]);
     glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
     glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR_MIPMAP_LINEAR);

  // Generate Mipmapped Texture (3 Bytes, Width, Height And Data From The BMP)
     gluBuild2DMipmaps(GL_TEXTURE_2D, 3, BMP.bmWidth, BMP.bmHeight, GL_BGR_EXT, GL_UNSIGNED_BYTE, BMP.bmBits);
     DeleteObject(hBMP);
    }
  }

And while my background skin loads, and gets drawn correctly, the other (piano) texture doesn't get drawn. Im sure the drawing code is correct because when i swap which texture is used (from the piano to the background texture, in this case), the other texture gets drawn. So i think the bitmap isn't being loaded correctly. But im not sure why? Is there something glaringly obvious i have overlooked?

The bitmap is 128*256 and 24 bit colour.

If you need any of the other code please let me know.

edit - If anyone knows of any librarys that would do what I require, please let me know

Codeguru.com forums - Asked pretty much the exact same question there. — Medicide
Most people don't mind that too much. Just make sure you aren't posting multiple times within the StackExchange family of sites, such as gamedev.stackexchange.com or programmers.stackexchange.com — Zoot

Nathan Monteleone Nathan Monteleone · Accepted Answer · 2012-01-09T15:45:09

It might not be working right because it's deprecated.

From http://www.opengl.org/wiki/Common_Mistakes:

gluBuild2DMipmaps - Never use this. Use either GL_GENERATE_MIPMAP (requires GL 1.4) or the glGenerateMipmap function (requires GL 3.0).

Edit: Also, you probably need to call glEnable(GL_TEXTURE_2D) for EACH texture unit, i.e. inside the loop where you call glBindTexture.

Textures not loading correctly?

1 Answers