Efficient object storage for zone rendering
View Patent ↗Similar, contiguous primitives are stored as a single primitive in zone rendering bins. A primitive packet used in the bin is allowed to vary in length and the currently open type of primitive is recorded on a per-bin basis. A special code is used to specify a variable number of subsequent indices. With this mechanism, the hardware is able to start outputting and replicating primitive commands into bin lists on the fly without requiring the buffering of the entire primitive. Given the variable nature of the primitive instruction, multiple similar/sequential primitives can be concatenated using a single primitive command header.
1. A graphics device, comprising:
a vertex buffer containing vertex data;
a plurality of bin buffers, each associated with a different zone on a display device and comprising a chained series of command buffers to store primitive command information; and
a graphics binning engine programmed to copy vertex data to the plurality of bin buffers when the vertex data is representative of a graphics primitive that intersects the zone associated with the bin buffer.
2. The graphics device as recited in claim 1 , wherein the graphics binning engine is programmed to maintain a graphics state by parsing state setting instructions.
3. The graphics device as recited in claim 2 , wherein the graphics binning engine is programmed to place the state setting instructions in the bin buffers.
4. The graphics device as recited in claim 1 , further comprising a graphics rendering engine for rendering an image on a zone-by-zone basis based on the data in the bin buffers.
5. A system comprising:
a graphics device having:
a plurality of vertex buffers including a first buffer to store vertex coordinate data of vertex data and a second buffer to store a remainder of the vertex data;
a plurality of bin buffers each associated with a zone of a display, each bin buffer to store primitive commands associated with a corresponding zone; and
a binning engine to read the vertex coordinate data in the first buffer and to write the primitive commands to the bin buffers based on the vertex coordinate data in the first buffer; and
a processor coupled to the graphics device.
6. The system of claim 5 , wherein dimensions of the zone are of a constant value tuned to a size and organization of a render cache.
7. The system of claim 5 , wherein at least some of the primitive commands stored in the bin buffers include a variable vertex count.
8. The system of claim 7 , wherein the at least some of the primitive commands include a header code to identify a variable number of indices.
9. A method comprising:
storing first vertex information to a first vertex buffer of a graphics engine and storing second vertex information to a second vertex buffer of the graphics engine, wherein the first vertex information corresponds to vertex coordinate data and the second vertex information corresponds to vertex remainder data of a primitive;
storing primitive instructions associated with the first vertex information to each of a plurality of bin buffers of the graphics engine corresponding to a display zone that is to be intersected by the primitive; and
reading the primitive instructions in the plurality of bin buffers to generate an image on a display.
10. The method of claim 9 , further comprising storing a zone at a time in a render cache coupled to the graphics engine.
11. The method of claim 9 , further comprising storing the primitive instructions with a variable vertex count.
12. The method of claim 11 , further comprising storing a header code in the primitive instructions to identify a variable number of indices.