Trouble with Textures

OpenGL Development
#1

I am trying to do a skyBox, but as soon as I put a texture on it the thing goes wonky! It looks like the base color of the texture is bleeding into the rest of the scene. Here are some pictures of what I mean:

Before Textures (I made the SkyBox gray so the spheres would show up!)

First texture I tried broke in a couple different ways!
Here is the Texture:

Here is the result:

Texture 2:

Result: (The spheres are there I promise!)

Texture 3:

Result:

Here’s the code I use for loading images:


private void loadTextures()
{
    rust = loadTexture("Box.jpg");
    night = loadTexture("cloud-02.jpg");
}

private int loadTexture(String path)
{
    IntBuffer image = ByteBuffer.allocateDirect(4).order(ByteOrder.nativeOrder()).asIntBuffer();
    IL.ilGenImages(image);
    IL.ilBindImage(image.get(0));
    IL.ilLoadImage(path);
    IL.ilConvertImage(IL.IL_RGB, IL.IL_BYTE);
    ByteBuffer scratch = ByteBuffer.allocateDirect(IL.ilGetInteger(IL.IL_IMAGE_WIDTH) * IL.ilGetInteger(IL.IL_IMAGE_HEIGHT) * 3);
    IL.ilCopyPixels(0, 0, 0, IL.ilGetInteger(IL.IL_IMAGE_WIDTH), IL.ilGetInteger(IL.IL_IMAGE_HEIGHT), 1, IL.IL_RGB, IL.IL_BYTE, scratch);
    
    // Create A IntBuffer For Image Address In Memory
    IntBuffer buf = ByteBuffer.allocateDirect(4).order(ByteOrder.nativeOrder()).asIntBuffer();
    GL11.glGenTextures(buf); // Create Texture In OpenGL
    GL11.glBindTexture(GL11.GL_TEXTURE_2D, buf.get(0));
    // Typical Texture Generation Using Data From The Image
     // Linear Filtering
    GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MIN_FILTER, GL11.GL_LINEAR);
    // Linear Filtering
    GL11.glTexParameteri(GL11.GL_TEXTURE_2D, GL11.GL_TEXTURE_MAG_FILTER, GL11.GL_LINEAR);
    // Generate The Texture
    GL11.glTexImage2D(GL11.GL_TEXTURE_2D, 0, GL11.GL_RGB, IL.ilGetInteger(IL.IL_IMAGE_WIDTH), 
    IL.ilGetInteger(IL.IL_IMAGE_HEIGHT), 0, GL11.GL_RGB, GL11.GL_UNSIGNED_BYTE, scratch);
    return buf.get(0); // Return Image Address In Memory
}

Any idea what I’m doing wrong? ???

#2

Try drawing those eggs with texturing disabled.

#3

Yes, openGL is state machine. It will remember latest texture used and it will be your current texture until you either disable it or enable another texture (for egg).

#4

HAHA Beautiful!!! Thank you!!! ;D

-=EDIT=-
So even though I was not setting and Texture Coords it still effected the scene?! Weird!, BUt disabling textrures worked perfectly!! Thanks again!

#5

Yes, you set the TexCoord, when you were rendering the skybox. As OpenGL is a state-machine is still has the last texcoord in it’s memory and will use it.

#6

Good to know! ;D That’s why I love this place! Everyone is so helpful!! Now I just need to get my posterier in gear and come up with something good to give back!!! :stuck_out_tongue:

#7

The scewed rusty texture output looks like you loaded RGB pixels (the image) into RGBA pixels (the texture).

#8

That’s very possible! I just started playing with GIMP so I am not sure what what’s going on with that yet! I’ll pull it into Photoshop and look at it! Thanks!!

#9

:-[ The trouble was that it was not a power of 2 and mu graphics card didn’t like it! I meant it to be 512x512, but somehow it came out to be 410x410! It was late…Yeah, that’s the ticket!! :wink:

Noe I am having another Texture issue. There is blurring of the texture, I know it has to have something to do with the kind of filtering I am enabling, or not, but I am not sure which one it is. Here is a pic of the problem!

It only happens when viewed from an extreme angle.

#10

You definitly need to mipmap your textures, then apply the correct MIN/MAG filters


boolean useMipmaps = true;

      if(useMipmaps)
      {
         MipMap.gluBuild2DMipmaps(GL_TEXTURE_2D, bpp, dim, dim, format, GL_UNSIGNED_BYTE, bb);
      }
      else
      {
         glTexImage2D(GL_TEXTURE_2D, 0, format, dim, dim, 0, format, GL_UNSIGNED_BYTE, bb);
      }

      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, useMipmaps ? GL_LINEAR_MIPMAP_LINEAR : GL_LINEAR);
      glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
#11

Very cool! I will look into that!! Thank you! ;D