Holes in Textures - Java-Gaming.org

dr-snipe

JGO n00b

Posts: 17

« on: 2011-11-07 10:22:21 »

Alright, so in my engine there is a texture 512x512 that is being used on a map of points 512x512. The problem lies when the heights of the points are changed, the texture seems to not stetch to fit the change in height. The texture then appears see through and you can see the rest of the map. Is there a specific property I need to set for the texture?

The rendering code:

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gl.glNewList(listNumber, GL.GL_COMPILE);

   texture.enable();
   texture.bind();
   
   gl.glBegin(GL.GL_TRIANGLES);
   for(int z = 0; z < 512; z++)
   {
      for(int x = 0; x < 512; x++)
      {
         gl.glTexCoord2f((float)x/texture.getWidth(), (float)z/texture.getHeight());
         gl.glVertex3f(x, (int)points[x][z], z);
         
         gl.glTexCoord2f((float)(x+1)/texture.getWidth(), (float)z/texture.getHeight());
         gl.glVertex3f(x+1, (int)points[x+1][z], z);
         
         gl.glTexCoord2f((float)x/texture.getWidth(), (float)(z+1)/texture.getHeight());
         gl.glVertex3f(x, (int)points[x][z+1], z+1);
         
         // ---------------------------------
         
         gl.glTexCoord2f((float)x/texture.getWidth(), (float)(z+1)/texture.getHeight());
         gl.glVertex3f(x, (int)points[x][z+1], z+1);
         
         gl.glTexCoord2f((float)(x+1)/texture.getWidth(), (float)z/texture.getHeight());
         gl.glVertex3f(x+1, (int)points[x+1][z], z);
         
         gl.glTexCoord2f((float)(x+1)/texture.getWidth(), (float)(z+1)/texture.getHeight());
         gl.glVertex3f(x+1, (int)points[x+1][z+1], z+1);
         
      }
   }
   
   gl.glEnd();
   
   texture.disable();
gl.glEndList();

Previews of the problem:

You can see what it should look like in the wireframe:

And what it looks like with the texture. You can see the rest of the map because the texture is not stretching (or whatever the problem is)

Thanks in advance

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theagentd

JGO Wizard

Posts: 1392
Medals: 88

Re: Holes in Textures

« Reply #1 on: 2011-11-07 21:05:30 »

Did you forget depth testing...? And disable blending, e.t.c. =S Cull face winding?

Also I don't think you can have texture binds in your display list. Try to move the texture.bind() at least to before you call glCallList() in your game loop.

There is no god.

gouessej

JGO Kernel

Posts: 3560
Medals: 30

TUER

Re: Holes in Textures

« Reply #2 on: 2011-11-13 05:45:01 »

Hi

Actually, you should not use display lists because their implementation is not consistent on some recent hardware, it is a waste of time. Rather use static VBOs even though they can be a bit slower with very small datasets.

Julien Gouesse

Games published by our own members! Go get 'em!

avm1979

Full Member

Posts: 157
Medals: 10

Re: Holes in Textures

« Reply #3 on: 2011-11-13 13:18:31 »

Quote from: theagentd on 2011-11-07 21:05:30

Did you forget depth testing...? And disable blending, e.t.c. =S Cull face winding?

Yeah, that's what that looks like.

Quote from: theagentd on 2011-11-07 21:05:30

Also I don't think you can have texture binds in your display list. Try to move the texture.bind() at least to before you call glCallList() in your game loop.

You definitely can use texture binds inside a display list.

Quote from: gouessej on 2011-11-13 05:45:01

Do you have any specifics? What hardware, any particular uses that trigger it, etc? I'd really appreciate any info you might share. I'm using display lists them and haven't had any problems (or had any problems reported).

Starfarer

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