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multi-tex problems

Started by Tera_Dragon Jan 22, 2005 at 3:59 PM 9 replies 900+ views

Original Post

Jan 22, 2005 at 3:59 PM

I have a model that uses normal 2D texturing and a terrain that uses multi-texturing. The probelm is that when I try to render both the model and the terrain only the terrain's textures render properly. The model is just grey. If I don't load the terrain though the model is rendered correctly. I have just worked out that this only occurs when I use GL_TEXTURE1_ARB. I can use GL_TEXTURE0_ARB without any trouble. I got these from the gametutorials height_map3 tutorial... #define GL_TEXTURE0_ARB 0x84C0 #define GL_TEXTURE1_ARB 0x84C1 I'm playing with the code as I'm writting this, and I've just found out that if I don't disable one of the GL_TEXTURE#_ARB then the model will be rendered with that texture. Is it somehow over writting the model texture? Thanks in advance for any help Tera_Dragon EDIT: If I don't disable GL_TEXTURE1_ARB then the model is rendered black...

Kalidor

Jan 22, 2005 at 4:04 PM

Make sure that when you render the model only the texture unit that it uses is enabled and that it is the current texture unit. Other than that I can't help much without seeing some relevant code.

Tera_Dragon

Author

Tera_Dragon

Jan 22, 2005 at 4:14 PM

What do you mean by the texture unit? I have a texture class that keeps the texture ID of each texture. If you don't mean that then please tell me what you do mean.
After loading the textures that I will be using for multi-texturing, and before rendering them, I use the following:

glActiveTextureARB(GL_TEXTURE0_ARB);
glEnable(GL_TEXTURE_2D);
texture.bind();

glActiveTextureARB(GL_TEXTURE1_ARB);
glEnable(GL_TEXTURE_2D);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_ARB);
glTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 2);
detailTexture.bind();

Also, after rendering the terrain I use:

glActiveTextureARB(GL_TEXTURE0_ARB);
glDisable(GL_TEXTURE_2D);

glActiveTextureARB(GL_TEXTURE1_ARB);
glDisable(GL_TEXTURE_2D);

Please tell me if you need any more info.

nts

115

nts

Jan 22, 2005 at 4:20 PM

Texture unit or TMU (Texture Mapping Unit) is what you enable and disable for multiple texture support with glActiveTextureARB.

What the above post meant was that make sure you only have unit 0 active when rendering the model. Make sure it (unit 0) is enabled and correctly bound to the texture.

btw you should also use

glActiveTextureARB(...);glClientActiveTextureARB(...);

when enabling and disabling the units

Tera_Dragon

Author

Tera_Dragon

Jan 22, 2005 at 4:34 PM

So should I change what GL_TEXTURE1_ARB everytime I am rendering a different texture? So that in one frame it could be used for the textures of eg 15 different models?
What does glClientActiveTextureARB() do?

EDIT: I have the model texturing working now, thanks! [:D] However i would still like to know what glClientActiveTextureARB() is.

nts

115

nts

Jan 22, 2005 at 4:55 PM

Quote:
Original post by Tera_Dragon
However i would still like to know what glClientActiveTextureARB() is.

It'll allow you to have a different texture coordinates array for each texture unit (must enable the texture coord array for each unit aswell).

Tera_Dragon

Author

Tera_Dragon

Jan 22, 2005 at 4:59 PM

Thanks a lot for all the help :-)

zix99

Jan 22, 2005 at 8:22 PM

//disable GL_TEXTURE1_ARB and 0
glActiveTextureARB(0); //set it back to normal
.. i dont know if that is the correct way to do it.. but it will reset it after your done, and it works for me.

~zix~

Tera_Dragon

Author

Tera_Dragon

Jan 23, 2005 at 2:20 AM

Can anyone else tell me if this is correct?

Gorax

Jan 23, 2005 at 5:13 AM

I seriously doubt that what zix99 does works correctly. All that'd be doing is setting the current active texture to 0, which isn't even a texture. I have encountered problems when trying to render single-textured surfaces with textures still active, so I'd stick with the way you're doing it, since I've had no problems doing it that way.

zedzeek

164

zedzeek

Jan 23, 2005 at 2:14 PM

glActiveTextureARB(GL_TEXTURE0_ARB);
...
...
glActiveTextureARB(GL_TEXTURE1_ARB);
glDisable(GL_TEXTURE_2D);
i think the problem is youve left texunit 1 as the current active unit

glActiveTextureARB(GL_TEXTURE0_ARB);
glEnable(GL_TEXTURE_2D);
texture.bind();
glActiveTextureARB(GL_TEXTURE1_ARB);
glEnable(GL_TEXTURE_2D);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_ARB);
glTexEnvi(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 2);
detailTexture.bind();

Also, after rendering the terrain I use:

glActiveTextureARB(GL_TEXTURE1_ARB); <-- 1
glDisable(GL_TEXTURE_2D);

glActiveTextureARB(GL_TEXTURE0_ARB);
glDisable(GL_TEXTURE_2D); <-- u prolly want to keep this enabled though

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