Graphics operation word format

Currently the graphics operation word is 56 bits long. The significance of the bits are described below:

• Bits 55 to 53: The opcode. With five different types of operations, we used three bits to represent the desired operation. 0b000 is rotation about the x-axis, 0b001 is rotation about the y-axis, 0b010 is rotation about the z-axis, 0b100 is translation, 0b101 is scaling.
• Bits 52 to 48: An index to a parametrized value. Updating parametrized values was not implemented, but 5 bits were reserved to index into a structure or table of values that would be updated upon very frame. Specifying 0b00000 would be always return a value of 1 (no parametrization).
• Bits 47 to 32, 31 to 16, and 15 to 0: The three 16-bit arguments to the transformations. For translation and scaling, all three values are used for the x-, y-, and z-transformations. For rotation, only the first is used as $\theta$ , the degree of rotation, represented as units of $2\pi/512$ radians.