Abstract: A graphics processing core of a tile-based graphics processing system when processing a tile of a graphics output reads a primitive to be processed off a tile list for the tile being processed, along with an identifier for that primitive. The graphics processing core then checks whether or not the identifier matches the identifier stored for any entry stored in a primitive data cache. A match indicates that primitive-specific data (including line equations, depth equations and barycentric equations) for the primitive to be processed is stored in the cache. If a match is found then the stored primitive-specific data is retrieved and used to process (rasterise and render) the primitive. If no match is found, primitive-specific data is calculated from scratch, stored in the primitive data cache, and used to process the primitive.

Abstract: A tile-based graphics processing system generates a render output by dividing it into a plurality of larger patches, each of which encompass a set of smaller patches. A rasterizer tests primitives against patches of the render output. When a primitive is found to completely cover a larger patch, depth function data for that primitive is stored in an entry of a depth buffer in respect of that largest patch position. When a subsequently-processed primitive is found to cover that same larger patch, the depth function data stored in the buffer is used to calculate depth range values for smaller patches that the larger patch encompasses. These depth range values, representative of the first primitive, are used to perform depth tests in respect of the second primitive. The depth function data stored in entry is then marked as invalid in respect of the smaller patches.

Abstract: A tile-based graphics processing system generates a render output by dividing it into a plurality of larger patches, each of which encompass a set of smaller patches. A rasteriser tests primitives against patches of the render output. When a primitive is found to completely cover a larger patch, depth function data for that primitive is stored in an entry of a depth buffer in respect of that largest patch position. When a subsequently-processed primitive is found to cover that same larger patch, the depth function data stored in the buffer is used to calculate depth range values for smaller patches that the larger patch encompasses. These depth range values, representative of the first primitive, are used to perform depth tests in respect of the second primitive. The depth function data stored in entry is then marked as invalid in respect of the smaller patches.

Abstract: A graphics processing core of a tile-based graphics processing system when processing a tile of a graphics output reads a primitive to be processed off a tile list for the tile being processed, along with an identifier for that primitive. The graphics processing core then checks whether or not the identifier matches the identifier stored for any entry stored in a primitive data cache. A match indicates that primitive-specific data (including line equations, depth equations and barycentric equations) for the primitive to be processed is stored in the cache. If a match is found then the stored primitive-specific data is retrieved and used to process (rasterise and render) the primitive. If no match is found, primitive-specific data is calculated from scratch, stored in the primitive data cache, and used to process the primitive.