Task assembly for SIMD processing

A method of processing primitives in a graphics processing system, the method comprising:

• storing, in a cache of the graphics processing system, graphics data items for use in rendering primitives;
• determining whether graphics data items relating to primitives to be processed for rendering are present in the cache;
• storing, in a task assembly unit of the graphics processing system, a plurality of task entries for respective tasks to which computation instances can be allocated, the computation instances being for generating graphics data items which are determined as being not present in the cache, wherein the task entries indicate which computation instances have been allocated to the respective tasks, and wherein the task entries are associated with characteristics of computation instances which can be allocated to the respective tasks;
• allocating, to a task, a computation instance to be executed, based on the characteristics of the computation instance;
• outputting one or more tasks for execution;
• executing, in a SIMD manner, computation instances of an outputted task to thereby determine graphics data items for storage in the cache;
• and
• rendering primitives using graphics data items stored in the cache.

A non-transitory computer readable storage medium having stored thereon an integrated circuit definition dataset that, when processed in an integrated circuit manufacturing system, configures the system to manufacture a graphics processing system, said graphics processing system comprising:

• a cache system configured to:
• store, in a cache, graphics data items for use in rendering primitives;
• and
• determine whether graphics data items relating to primitives to be processed for rendering are present in the cache;
• a task assembly unit configured to:
• store a plurality of task entries for respective tasks to which computation instances can be allocated, the computation instances being for generating graphics data items which are determined by the cache system as being not present in the cache, wherein the task entries indicate which computation instances have been allocated to the respective tasks, and wherein the task entries are associated with characteristics of computation instances which can be allocated to the respective tasks;
• allocate, to a task, a computation instance to be executed, based on the characteristics of the computation instance;
• and
• output one or more tasks for execution;
• SIMD processing logic configured to execute, in a SIMD manner, computation instances of a task outputted from the task assembly unit to thereby determine graphics data items for storage in the cache;
• and
• primitive processing logic configured to render primitives using graphics data items stored in the cache.