active unit 0
Author
hello all,
I got me another problem.
I use GLSL shader and texture units.
In my mesh render method I do following to set up texture units:
int l=-1;
if (m_vTextures.size()>0){
for (int n=0;n<m_vTextures.size();n++)
{
l++;
glActiveTexture(GL_TEXTURE0+l);
glEnable(GL_TEXTURE_2D); glBindTexture(GL_TEXTURE_2D,m_vTextures.at(n)->GetHWName());
glClientActiveTexture(GL_TEXTURE0+l);
}
}
The problem is that if I set unit 0 as the active unit my mesh is all black
but if I use other higher units(and change uniforms setting to correspond of course) I get my texture drawn. I do no settings or operations on unit 0 except that I load my textures by that unit like this:
glActiveTexture(GL_TEXTURE0);
glEnable(GL_TEXTURE_2D);
glBindTexture(GL_TEXTURE_2D,m_iTextureName);
glTexImage2D(GL_TEXTURE_2D,0, 3, m_iWidth, m_iHeight,0, GL_BGR, GL_UNSIGNED_BYTE, colorsa);
gluBuild2DMipmaps(GL_TEXTURE_2D, 3, m_iWidth, m_iHeight, GL_BGR, GL_UNSIGNED_BYTE, colorsa);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
glBindTextureEXT(GL_TEXTURE_2D,0);
glDisable(GL_TEXTURE_2D);
This is how I pass textures to my shader:
if (mesh->GetTexture(0,1))
glUniform1i(texuA,0);
if (mesh->GetTexture(1,1))
glUniform1i(texuB,1);
if (mesh->GetTexture(2,1))
glUniform1i(texuC,2);
if (mesh->GetTexture(3,1))
glUniform1i(texuD,3);
So I somehow can't use unit 0. Why could that be?
I don't know about the problem you are having but...
You don't need to call glClientActiveTexture. That is for glTexCoordPointer.
You don't need to glEnable(GL_TEXTURE_2D);
You don't need to glBindTextureEXT(GL_TEXTURE_2D,0);
You don't need glTexImage2D since you re calling gluBuild2DMipmaps
Since you want to use mipmaps
why do you call glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
Use glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR_MIPMAP_LINEAR);
You don't need to call glClientActiveTexture. That is for glTexCoordPointer.
You don't need to glEnable(GL_TEXTURE_2D);
You don't need to glBindTextureEXT(GL_TEXTURE_2D,0);
You don't need glTexImage2D since you re calling gluBuild2DMipmaps
Since you want to use mipmaps
why do you call glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
Use glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR_MIPMAP_LINEAR);
Author
solved, I was setting the same sampler to more shader unifroms. So it seems I cant use the same sampler on more then one uniform shader sampler. Hmmm, can I somehow set more shader sampler2d unifroms to the same sampler?
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