IP Status Unknown, but believed to be none. Not required, this wastes a lot of space. This alows some implementations to add a stack if desired. Not explicitely, but indexing the matrix palette provides this functionality. In addition, a current normal, current texture coordinates, current color, current matrix indices, and current weights may be used in processing each vertex.
Texture coordinates determine how a texture image is mapped onto a primitive.
Indices are used to select modelview matrices from the palette when blending is enabled. Weights are used as blending factors when vertex blending is enabled. One weight and one index exists for each enabled vertex blend unit. Vertex units are enabled with Enable, and disabled with Disable. When the values are supplied as byte, short, or int, they are converted to floating-point values as indicated for the corresponting type in Table 2.6.