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glClientActiveTextureARB issues....

Started by RuilMalvar Mar 19, 2005 at 10:54 PM 5 replies 3.4k views

Original Post

Mar 19, 2005 at 10:54 PM

I am currently utilizing ARB shaders and to specify texture coordinates for each texture unit. I use glClientActiveTextureARB( GL_TEXTURE_ARB )


glClientActiveTextureARB(GL_TEXTURE0_ARB);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
glTexCoordPointer(2, GL_FLOAT, 0, m_pTexCoords);
glBindTexture(GL_TEXTURE_2D, m_iTex0);

glClientActiveTextureARB(GL_TEXTURE1_ARB);
glEnableClientState(GL_TEXTURE_COORD_ARRAY);
glTexCoordPointer(2, GL_FLOAT, 0, m_pTexCoords);
glBindTexture(GL_TEXTURE_2D, m_iTex1);

So the problem that is happening is that the last texture unit that I’m binding to is set to the primary GL_TEXTURE0 texture unit. Any ideas on why this is happening?

noisecrime

Mar 19, 2005 at 11:19 PM

Think you've forgotten to use

glActiveTextureARB(GL_TEXTURE0_ARB);
and
glActiveTextureARB(GL_TEXTURE1_ARB);

These set the active texture unit for binding textures to, whilst glClientActiveTextureARB sets the active texture unit for vertex array states (e.g vertices, normals, texture coordinates etc)

RuilMalvar

Author

RuilMalvar

Mar 20, 2005 at 12:09 AM

When I do that,

It will work, though everything in my scene that is textured is textured black except for the object rendered after the above code. Though the only thing different from this object from the rest of the scene is that it's the only thing which has a shader applied to it.

so...

glEnable(GL_VERTEX_PROGRAM_ARB);glBindProgramARB(GL_VERTEX_PROGRAM_ARB, 0);glEnable(GL_FRAGMENT_PROGRAM_ARB);glBindProgramARB(GL_FRAGMENT_PROGRAM_ARB, 1);glActiveTexture(GL_TEXTURE0_ARB);glClientActiveTextureARB(GL_TEXTURE0_ARB);glEnableClientState(GL_TEXTURE_COORD_ARRAY);glTexCoordPointer(2, GL_FLOAT, 0, m_pTexCoords);glBindTexture(GL_TEXTURE_2D, m_iTex0);glActiveTexture(GL_TEXTURE1_ARB);glClientActiveTextureARB(GL_TEXTURE1_ARB);glEnableClientState(GL_TEXTURE_COORD_ARRAY);glTexCoordPointer(2, GL_FLOAT, 0, m_pTexCoords);glBindTexture(GL_TEXTURE_2D, m_iTex1);glVertexPointer(3, GL_FLOAT, 0, m_pVertices);glNormalPointer(GL_FLOAT, 0, m_pNormals);glDrawElements(GL_TRIANGLES, m_iNumOfFaces * 3, GL_UNSIGNED_INT, m_pFaceIndices);glDisable(GL_VERTEX_PROGRAM_ARB);glDisable(GL_FRAGMENT_PROGRAM_ARB);

This is the flow of rendering my object, but for only this object. What gives?

[Edited by - RuilMalvar on March 20, 2005 1:09:45 AM]

noisecrime

Mar 20, 2005 at 12:31 AM

you use
glActiveTexture(GL_TEXTURE1_ARB);

twice in that code. The first time it should be
glActiveTexture(GL_TEXTURE0_ARB);

RuilMalvar

Author

RuilMalvar

Mar 20, 2005 at 1:52 AM

sorry, it was a typo, the texture units 0 and 1 are being set accordingly.

CRACK123

Mar 20, 2005 at 3:49 AM

You need to disable the multitexturing after you are done with it

glClientActiveTexture(GL_TEXTURE0_ARB);glActiveTexture(GL_TEXTURE0_ARB);glEnable(GL_TEXTURE_2D);glClientActiveTexture(GL_TEXTURE1_ARB);glActiveTexture(GL_TEXTURE0_ARB);glEnable(GL_TEXTURE_2D);.........glClientActiveTexture(GL_TEXTURE0_ARB);glActiveTexture(GL_TEXTURE0_ARB);glDisable(GL_TEXTURE_2D);glClientActiveTexture(GL_TEXTURE1_ARB);glActiveTexture(GL_TEXTURE0_ARB);glDisable(GL_TEXTURE_2D);

RuilMalvar

Author

RuilMalvar

Mar 20, 2005 at 3:09 PM

That was it, Thank you very much.

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