glClientActiveTexture.3G man page
glClientActiveTexture — select active texture unit
void glClientActiveTexture(GLenum texture);
Specifies which texture unit to make active. The number of texture units is implementation dependent, but must be at least two. texture must be one of GL_TEXTUREi, where i ranges from 0 to the value of GL_MAX_TEXTURE_COORDS - 1, which is an implementation-dependent value. The initial value is GL_TEXTURE0.
glClientActiveTexture selects the vertex array client state parameters to be modified by glTexCoordPointer(), and enabled or disabled with glEnableClientState() or glDisableClientState(), respectively, when called with a parameter of GL_TEXTURE_COORD_ARRAY.
glClientActiveTexture is supported only if the GL version is 1.3 or greater, or ARB_multitexture is included in the string returned by glGetString() when called with the argument GL_EXTENSIONS.
GL_INVALID_ENUM is generated if texture is not one of GL_TEXTUREi, where i ranges from 0 to the value of GL_MAX_TEXTURE_COORDS - 1.
glGet() with argument GL_CLIENT_ACTIVE_TEXTURE or GL_MAX_TEXTURE_COORDS
glActiveTexture(), glDisableClientState(), glEnableClientState(), glMultiTexCoord(), glTexCoordPointer()
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