GPU Texture Tile Caching for High Resolution Image Panning
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Solution Overview
Problem
Real-time image display in computer systems experiences slowdowns or freezing when panning and zooming due to limited GPU texture memory, maximum texture size constraints, and memory transfer speed limitations, which are exacerbated by the need for mip maps that require extra storage and processing.
Innovation Solution
Organizing image data into multiple resolution layers divided into data tiles, maintaining these tiles in cached textures of a GPU, and using a combination of CPU and GPU to efficiently draw images by utilizing lower resolution data while loading higher resolution data, ensuring seamless panning and zooming without freezing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the entire high resolution image is stored in GPU texture memory, then the image quality and resolution are improved, but the available texture memory is insufficient to store the entire image
Solution Approach 1:
The patent divides the high-resolution image into multiple tiles or chunks that can be stored separately in GPU texture memory. Each tile represents a portion of the overall image, allowing the system to manage limited memory resources by loading only the necessary tiles into memory at any given time rather than attempting to load the entire high-resolution image at once.
2Adaptability or versatility
If mip maps are used for high resolution images, then the image display at varying zoom levels is improved, but the extra storage and processing requirements increase system complexity
Solution Approach 1:
The patent extracts or removes the mip map generation and processing step from the image display pipeline. Instead of generating and managing multiple resolution levels through mip maps, the system uses a single high-resolution image and dynamically loads appropriate tiles into GPU memory based on the current zoom level and viewport, eliminating the need for pre-generated mip map pyramids and their associated complexity.
3Measurement precision
If the image is displayed at high resolution, then the image quality is improved, but the memory transfer speed between main memory and GPU limits the data transfer rate
Solution Approach 1:
The patent performs preliminary actions by pre-processing the high-resolution image into manageable tiles on the CPU before transferring to the GPU. This preparation work is done in advance, allowing the GPU to receive smaller, optimized chunks of data that can be transferred more efficiently through memory bandwidth constraints, while still maintaining the ability to display high-resolution imagery when needed.
Data Source
AI summary
A system maintains data from different resolution levels of an image in textures of a graphics processing unit (GPU). Image data is organized into multiple resolution layers of an image. Data from the lower resolution level(s) is used to process an image while higher resolution data is loaded. In one embodiment, a first resolution representation of the image having a lowest resolution level using data resident in the GPU memory is drawn prior to drawing a portion of a second resolution representation having a higher resolution level using data resident in the GPU memory.