摘要:
A method and apparatus for executing loop and branch program instructions in a programmable graphics shader. The programmable graphics shader converts a sequence of instructions comprising a portion of a shader program and selects a first set of fragments to be processed. Subsequent sequences of instructions are converted until all of the instructions comprising the shader program have been executed on the first set of fragments. Each remaining set of fragments is processed by the shader program until all of the fragments are processed in the same manner. Furthermore, the instructions can contain one or more loop or branch program instructions that are conditionally executed. Additionally, when instructions within a loop as defined by a loop instruction are being executed a current loop count is pipelined through the programmable graphics shader and used as an index to access graphics memory.
摘要:
A method and apparatus for executing loop and branch program instructions in a programmable graphics shader. The programmable graphics shader converts a sequence of instructions comprising a portion of a shader program and selects a first set of fragments to be processed. Subsequent sequences of instructions are converted until all of the instructions comprising the shader program have been executed on the first set of fragments. Each remaining set of fragments is processed by the shader program until all of the fragments are processed in the same manner. Furthermore, the instructions can contain one or more loop or branch program instructions that are conditionally executed. Additionally, when instructions within a loop as defined by a loop instruction are being executed a current loop count is pipelined through the programmable graphics shader and used as an index to access graphics memory.
摘要:
A system includes a graphics processing unit with a processor responsive to a debug instruction that initiates the storage of execution state information. A memory stores the execution state information. A central processing unit executes a debugging program to analyze the execution state information.
摘要:
A method and system for improving data coherency in a parallel rendering system is disclosed. Specifically, one embodiment of the present invention sets forth a method for managing a plurality of independently processed texture streams in a parallel rendering system that includes the steps of maintaining a time stamp for a group of tiles of work that are associated with each of the plurality of the texture streams and are associated with a specified area in screen space, and utilizing the time stamps to counter divergences in the independent processing of the plurality of texture streams.
摘要:
One embodiment of an instruction decoder includes an instruction parser configured to process a first non-operative instruction and to generate a first event signal corresponding to the first non-operative instruction, and a first event multiplexer configured to receive the first event signal from the instruction parser, to select the first event signal from one or more event signals and to transmit the first event signal to an event logic block. The instruction decoder may be implemented in a multithreaded processing unit, such as a shader unit, and the occurrences of the first event signal may be tracked when one or more threads are executed within the processing unit. The resulting event signal count may provide a designer with a better understanding of the behavior of a program, such as a shader program, executed within the processing unit, thereby facilitating overall processing unit and program design.
摘要:
A shader having a cache memory for storing program instructions is described. The cache memory beneficially stores both current programming instructions for a fragment program being run and “look-ahead” programming instructions. The cache memory supports a scheduler that forms program commands that control programmable processing stations. The cache memory can store multiple programming instructions for a plurality of shaders. If the cache memory does not include the desired programming instructions, a miss is asserted and a scheduler (instruction processor) recovers the programming instructions to be run. Beneficially, the scheduler recovers additional programming instructions to support the look-ahead programming. The cache memory stores program instructions by cachelines, where each cacheline comprises a plurality of programming instructions. The cache memory can also store program identifiers.
摘要:
In a raster stage of a graphics processor, a method for parallel fine rasterization. The method includes receiving a graphics primitive for rasterization in a raster stage of a graphics processor. The graphics primitive is rasterized at a first level to generate a plurality of tiles of pixels. The titles are subsequently rasterized at a second level by allocating the tiles to an array of parallel second-level rasterization units to generate covered pixels. The covered pixels are then output for rendering operations in a subsequent stage of the graphics processor.
摘要:
In a raster stage of a graphics processor, a method for parallel fine rasterization. The method includes receiving a graphics primitive for rasterization in a raster stage of a graphics processor. The graphics primitive is rasterized at a first level to generate a plurality of tiles of pixels. The titles are subsequently rasterized at a second level by allocating the tiles to an array of parallel second-level rasterization units to generate covered pixels. The covered pixels are then output for rendering operations in a subsequent stage of the graphics processor.
摘要:
One embodiment of a system for collecting performance data for a multithreaded processing unit includes a plurality of independent performance registers, each configured to count hardware-based and/or software-based events. Functional blocks within the multithreaded processing unit are configured to generate various event signals, and subsets of the events are selected and used to generate one or more functions, each of which increments one of the performance registers. By accessing the contents of the performance registers, a user may observe and characterize the behavior of the different functional blocks within the multithreaded processing unit when one or more threads are executed within the processing unit. The contents of the performance registers may also be used to modify the behavior of the program running on the multithreaded processing unit, to modify a global performance register or to trigger an interrupt.
摘要:
A graphics processing unit includes a first processing controller controlling a first set of multi-threaded processors. A second processing controller controls a second set of multi-threaded processors. A serial bus connects the first processing controller to the second processing controller. The first processing controller gathers first state information from the first set of multi-threaded processors in response to a context switch token and then passes the context switch token over the serial bus to the second processing controller. The second processing controller gathers second state information from the second set of multi-threaded processors in response to the context switch token.