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公开(公告)号：US11727525B2
公开(公告)日：2023-08-15
申请号：US17333695
申请日：2021-05-28
Applicant: Imagination Technologies Limited
Inventor： Roger Hernando Buch , Panagiotis Velentzas , Richard Broadhurst , Xile Yang , John W. Howson
CPC classification number: G06T1/20 , G06F9/4881 , G06F9/5038 , G06F9/52 , G06F12/0261 , G06T1/60
Abstract: Methods and apparatus for merging tasks in a graphics pipeline in which, subsequent to a trigger to flush a tag buffer, one or more tasks from the flushed tag buffer are generated, each task comprising a reference to a program and plurality of fragments on which the program is to be executed, wherein a fragment is an element of a primitive at a sample position. It is then determined whether merging criteria are satisfied and if satisfied, one or more fragments from a next tag buffer flush are added to a last task of the one or more tasks generated from the flushed tag buffer.
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公开(公告)号：US20230169717A1
公开(公告)日：2023-06-01
申请号：US18101028
申请日：2023-01-24
Applicant: Imagination Technologies Limited
Inventor： John W. Howson , Luke Tilman Peterson , Steven J. Clohset
CPC classification number: G06T15/06 , G06T15/80 , G06T15/005 , G06T1/20 , G06T2200/04 , G06T2200/28 , G06T2207/20021
Abstract: A graphics processor architecture provides for scan conversion and ray tracing approaches to visible surface determination as concurrent and separate processes. Surfaces can be identified for shading by scan conversion and ray tracing. Data produced by each can be normalized, so that instances of shaders, being executed on a unified shading computation resource, can shade surfaces originating from both ray tracing and rasterization. Such resource also may execute geometry shaders. The shaders can emit rays to be tested for intersection by the ray tracing process. Such shaders can complete, without waiting for those emitted rays to complete. Where scan conversion operates on tiles of 2-D screen pixels, the ray tracing can be tile aware, and controlled to prioritize testing of rays based on scan conversion status. Ray population can be controlled by feedback to any of scan conversion, and shading.
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公开(公告)号：US11663771B2
公开(公告)日：2023-05-30
申请号：US17407719
申请日：2021-08-20
Applicant: Imagination Technologies Limited
Inventor： Robert Brigg , John W. Howson , Xile Yang
CPC classification number: G06T15/40 , G06T1/60 , G06T15/005
Abstract: A cache for use in a tile-based rendering graphics processing system for storing transformed primitive blocks, the graphics processing system having a rendering space sub-divided into a plurality of tiles to which primitives can be associated, the graphics processing system comprising rasterization logic that rasterizes primitives on a per tile basis in a plurality of stages, the cache comprising: memory configured to store a plurality of transformed primitive blocks in the cache, each transformed primitive block comprising transformed geometry data for one or more primitives; control logic configured to: maintain a counter for each of the plurality of transformed primitive blocks stored in the cache that indicates a number of tiles of the plurality of tiles that are currently being processed by the rasterization logic and require access to that transformed primitive block, the counter being updated when any stage of the rasterization logic indicates a tile no longer requires access to the transformed primitive block; in response to receiving a request to add a new transformed primitive block to the cache when the cache is full, select a transformed primitive block to evict from the cache based on the counters associated therewith; and evict the selected transformed primitive block from the cache.
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公开(公告)号：US20220392154A1
公开(公告)日：2022-12-08
申请号：US17888220
申请日：2022-08-15
Applicant: Imagination Technologies Limited
Inventor： John W. Howson
Abstract: 3-D rendering systems include a rasterization section that can fetch untransformed geometry, transform geometry and cache data for transformed geometry in a memory. As an example, the rasterization section can transform the geometry into screen space. The geometry can include one or more of static geometry and dynamic geometry. The rasterization section can query the cache for presence of data pertaining to a specific element or elements of geometry, and use that data from the cache, if present, and otherwise perform the transformation again, for actions such as hidden surface removal. The rasterization section can receive, from a geometry processing section, tiled geometry lists and perform the hidden surface removal for pixels within respective tiles to which those lists pertain.
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公开(公告)号：US11481952B2
公开(公告)日：2022-10-25
申请号：US17039564
申请日：2020-09-30
Applicant: Imagination Technologies Limited
Inventor： Xile Yang , John W. Howson , Jonathan Redshaw
Abstract: An application sends primitives to a graphics processing system so that an image of a 3D scene can be rendered. The primitives are placed into primitive blocks for storage and retrieval from a parameter memory. Rather than simply placing the first primitives into a primitive block until the primitive block is full and then placing further primitives into the next primitive block, multiple primitive blocks can be “open” such that a primitive block allocation module can allocate primitives to one of the open primitive blocks to thereby sort the primitives into primitive blocks according to their spatial positions. By grouping primitives together into primitive blocks in accordance with their spatial positions, the performance of a rasterization module can be improved. For example, in a tile-based rendering system this may mean that fewer primitive blocks need to be fetched by a hidden surface removal module in order to process a tile.
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Patent Agency Ranking
公开(公告)号：US20220262061A1
公开(公告)日：2022-08-18
申请号：US17735932
申请日：2022-05-03
Applicant: Imagination Technologies Limited
Inventor： John W. Howson , Richard Broadhurst , Steven Fishwick
Abstract: A graphics processing unit (GPU) processes graphics data using a rendering space which is sub-divided into a plurality of tiles. The GPU comprises cost indication logic configured to obtain a cost indication for each of a plurality of sets of one or more tiles of the rendering space. The cost indication for a set of tile(s) is suggestive of a cost of processing the set of one or more tiles. The GPU controls a rendering complexity with which primitives are rendered in tiles based on the cost indication for those tiles. This allows tiles to be rendered in a manner that is suitable based on the complexity of the graphics data within the tiles. In turn, this allows the rendering to satisfy constraints such as timing constraints even when the complexity of different tiles may vary significantly within an image.
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公开(公告)号：US11315302B2
公开(公告)日：2022-04-26
申请号：US16411628
申请日：2019-05-14
Applicant: Imagination Technologies Limited
Inventor： John W. Howson , Steven J. Clohset , Ali Rabbani
Abstract: A ray tracing unit is implemented in a graphics rendering system. The ray tracing unit comprises: processing logic configured to perform ray tracing operations on rays, a dedicated ray memory coupled to the processing logic and configured to store ray data for rays to be processed by the processing logic, an interface to a memory system, and control logic configured to manage allocation of ray data to either the dedicated ray memory or the memory system. Core ray data for rays to be processed by the processing logic is stored in the dedicated ray memory, and at least some non-core ray data for the rays is stored in the memory system. This allows core ray data for many rays to be stored in the dedicated ray memory without the size of the dedicated ray memory becoming too wasteful when the ray tracing unit is not in use.
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公开(公告)号：US20220084281A1
公开(公告)日：2022-03-17
申请号：US17536671
申请日：2021-11-29
Applicant: Imagination Technologies Limited
Inventor： Xile Yang , Robert Brigg , John W. Howson
Abstract: Methods and primitive block generators for generating primitive blocks in a graphics processing system. The methods comprise: receiving transformed position data for a current primitive, the transformed position data indicating a position of the current primitive in rendering space; determining a distance between the position of the current primitive and a position of a current primitive block based on the transformed position data for the current primitive; determining whether to add the current primitive to the current primitive block based on the distance and a fullness of the current primitive block; in response to determining that the current primitive is to be added to the current primitive block, adding the current primitive to the current primitive block; and in response to determining that the current primitive is not to be added to the current primitive block, flushing the current primitive block and adding the current primitive to a new current primitive block.
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公开(公告)号：US11158023B2
公开(公告)日：2021-10-26
申请号：US16724234
申请日：2019-12-21
Applicant: Imagination Technologies Limited
Inventor： Robert Brigg , Xile Yang , John W. Howson
Abstract: A graphics processing system having a rendering space divided into a plurality of tiles. The system comprises geometry processing logic and rasterization logic. The geometry processing logic is configured to generate transformed position data for each of a plurality of untransformed primitives based on untransformed geometry data associated therewith; group the plurality of untransformed primitives into a plurality of primitive blocks; and generate an untransformed display list for each tile based on the transformed position data. Each untransformed display list comprises: (i) information identifying each untransformed primitive block that comprises at least one untransformed primitive that, when transformed, falls at least partially with the tile; and (ii) for each identified untransformed primitive bock, information identifying the untransformed primitives or transformed primitives related to that untransformed primitive block relevant for rendering the tile. The rasterization logic is configured to fetch, for each primitive block identified in an untransformed display list for a tile, untransformed geometry data for all of the untransformed primitives in that untransformed primitive block; transform the fetched untransformed geometry data to generate transformed geometry data; and render the primitives from the transformed geometry data.
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公开(公告)号：US20210248805A1
公开(公告)日：2021-08-12
申请号：US17170590
申请日：2021-02-08
Applicant: Imagination Technologies Limited
Inventor： Diego Jesus , John W. Howson , Panagiotis Velentzas , Robert Brigg , Xile Yang
Abstract: Methods and control stream generators for generating a control stream for a tile group comprising at least two tiles, the control stream identifying primitive blocks that are relevant to rendering at least one tile in the tile group. The method includes: receiving information identifying one or more primitive blocks relevant to rendering at least one tile in the tile group, each primitive block comprising one or more primitives; generating a primitive block entry for each of the identified primitive blocks; and adding each primitive block entry to the control stream; wherein generating the primitive block entry for at least one of the identified primitive blocks comprises: (i) identifying a bounding box encompassing the one or more primitives of the primitive block; (ii) generating a coverage mask that indicates which tiles of the tile group that intersect the bounding box for the primitive block are valid for the primitive block, a tile being valid for a primitive block if at least one primitive of the primitive blocks falls, at least partially, within the bounds of the tile; and (iii) including the coverage mask in the primitive block entry.
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