select active texture unit
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_TEXTURE , 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 .
GL_INVALID_ENUM is generated if texture is not one of GL_TEXTURE , 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
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