Fast incremental shared constants

An apparatus for graphics processing, comprising:

• a memory;
• and
• at least one processor coupled to the memory and configured to:
• receive, in at least one register, shared constant data from a central processing unit (CPU), the shared constant data corresponding to a first draw call update of a first draw call of a plurality of draw calls;
• configure the at least one register based on the shared constant data corresponding to the first draw call update of the first draw call;
• send, using a shader preamble, the shared constant data corresponding to the first draw call update of the first draw call from the at least one register to at least one of a constant memory or a constant buffer;
• and
• receive, in the at least one register, updated shared constant data from the CPU, the updated shared constant data corresponding to a second draw call update of a second draw call of the plurality of draw calls, the second draw call being subsequent to the first draw call, wherein the shared constant data and the updated shared constant data are both available for the second draw call.

A non-transitory computer-readable medium storing computer executable code, the code when executed by at least one processor, causes the at least one processor to:

• receive, in at least one register, shared constant data from a central processing unit (CPU), the shared constant data corresponding to a first draw call update of a first draw call of a plurality of draw calls;
• configure the at least one register based on the shared constant data corresponding to the first draw call update of the first draw call;
• send, using a shader preamble, the shared constant data corresponding to the first draw call update of the first draw call from the at least one register to at least one of a constant memory or a constant buffer;
• and
• receive, in the at least one register, updated shared constant data from the CPU, the updated shared constant data corresponding to a second draw call update of a second draw call of the plurality of draw calls, the second draw call being subsequent to the first draw call, wherein the shared constant data and the updated shared constant data are both available for the second draw call.