Alternate frame rendering

Last updated

Alternate Frame Rendering (AFR) is a technique of graphics rendering in personal computers which combines the work output of two or more graphics processing units (GPU) for a single monitor, in order to improve image quality, or to accelerate the rendering performance. The technique is that one graphics processing unit computes all the odd video frames, the other renders the even frames. This technique is useful for generating 3D video sequences in real time, improving or filtering textured polygons and performing other computationally intensive tasks, typically associated with computer gaming, CAD and 3D modeling. [1]

Contents

One disadvantage of AFR is a defect known as micro stuttering.

Parallel rendering methods

AFR belongs to a class of parallel rendering methods, which subdivide a four-dimensional image frame[ dubious ] sequence (x,y,z and time) into smaller regions, each of which is then assigned to a different physical processor within a multi-processor array. Note that the regional boundaries may be defined in space or in time. Also, the multiple processors can be implemented within a single video card or separate video graphics cards can be combined, subject to the motherboard and I/O slot limitations. When separate video cards are used, they must be specifically designed to allow a "cross-link" between them.

If a computer has two video cards that combine their outputs into a single video monitor, then one of four methods could be used to create the images.

See also

Related Research Articles

Graphics card Expansion card which generates a feed of output images to a display device

A graphics card is an expansion card which generates a feed of output images to a display device. Frequently, these are advertised as discrete or dedicated graphics cards, emphasizing the distinction between these and integrated graphics. At the core of both is the graphics processing unit (GPU), which is the main component that performs computations, but should not be confused with the graphics card as a whole, although "GPU" is often used as a metonymic shorthand to refer to graphics cards.

GeForce 256 GPU by Nvidia

The GeForce 256 is the original release in Nvidia's "GeForce" product-line. Announced on September 1, 1999 and released on October 11, 1999, the GeForce 256 improves on its predecessor by increasing the number of fixed pixel pipelines, offloading host geometry calculations to a hardware transform and lighting (T&L) engine, and adding hardware motion compensation for MPEG-2 video. It offered a notably large leap in 3D PC gaming performance and was the first fully Direct3D 7-compliant 3D accelerator.

Framebuffer Portion of random-access memory containing a bitmap that drives a video display

A framebuffer is a portion of random-access memory (RAM) containing a bitmap that drives a video display. It is a memory buffer containing data representing all the pixels in a complete video frame. Modern video cards contain framebuffer circuitry in their cores. This circuitry converts an in-memory bitmap into a video signal that can be displayed on a computer monitor.

3dfx Interactive American technology company

3dfx Interactive was an American technology company headquartered in San Jose, California, founded in 1994, that specialized in the manufacturing of 3D graphics processing units, and later, video cards. It was a pioneer in the field from the late 1990s until 2000.

Graphics processing unit Specialized electronic circuit; graphics accelerator

A graphics processing unit (GPU) is a specialized electronic circuit designed to rapidly manipulate and alter memory to accelerate the creation of images in a frame buffer intended for output to a display device. GPUs are used in embedded systems, mobile phones, personal computers, workstations, and game consoles.

RIVA TNT2 GPU by Nvidia

The RIVA TNT2 is a graphics processing unit manufactured by Nvidia starting in early 1999. The chip is codenamed "NV5" because it is the 5th graphics chip design by Nvidia, succeeding the RIVA TNT (NV4). RIVA is an acronym for Real-time Interactive Video and Animation accelerator. The "TNT" suffix refers to the chip's ability to work on two texels at once. Nvidia removed RIVA from the name later in the chip's lifetime.

Scalable Link Interface Brand name; multi-GPU technology by Nvidia

Scalable Link Interface (SLI) is a brand name for a deprecated multi-GPU technology developed by Nvidia for linking two or more video cards together to produce a single output. SLI is a parallel processing algorithm for computer graphics, meant to increase the available processing power.

Shader sige Type of program in a graphical processing unit (GPU)

In computer graphics, a shader is a type of computer program originally used for shading in 3D scenes. They now perform a variety of specialized functions in various fields within the category of computer graphics special effects, or else do video post-processing unrelated to shading, or even perform functions unrelated to graphics.

Voodoo 5 Graphics card line

The Voodoo 5 was the last and most powerful graphics card line that 3dfx Interactive released. All members of the family were based upon the VSA-100 graphics processor. Only the single-chip Voodoo 4 4500 and dual-chip Voodoo 5 5500 made it to market.

General-purpose computing on graphics processing units is the use of a graphics processing unit (GPU), which typically handles computation only for computer graphics, to perform computation in applications traditionally handled by the central processing unit (CPU). The use of multiple video cards in one computer, or large numbers of graphics chips, further parallelizes the already parallel nature of graphics processing.

Scan-Line Interleave Multi-GPU technology

Scan-Line Interleave (SLI) from 3dfx is a method for linking two video cards or chips together to produce a single output. It is an application of parallel processing for computer graphics, meant to increase the processing power available for graphics. SLI from 3dfx was introduced in 1998 and used in the Voodoo2 line of graphics accelerators. However, the original Voodoo Graphics card and the VSA-100 were also SLI-capable.

Quadro Brand of Nvidia graphics cards intended for use in workstations running professional applications

Quadro was Nvidia's brand for graphics cards intended for use in workstations running professional computer-aided design (CAD), computer-generated imagery (CGI), digital content creation (DCC) applications, scientific calculations and machine learning.

The render output unit, often abbreviated as "ROP", and sometimes called raster operations pipeline, is a hardware component in modern graphics processing units (GPUs) and one of the final steps in the rendering process of modern graphics cards. The pixel pipelines take pixel, and texel information and process it, via specific matrix and vector operations, into a final pixel or depth value. This process is called rasterization. So ROPs control antialiasing, when more than one sample is merged into one pixel. The ROPs perform the transactions between the relevant buffers in the local memory – this includes writing or reading values, as well as blending them together. Dedicated antialiasing hardware used to perform hardware-based antialiasing methods like MSAA is contained in ROPs.

3D rendering Process of converting 3D scenes into 2D images

3D rendering is the 3D computer graphics process of converting 3D models into 2D images on a computer. 3D renders may include photorealistic effects or non-photorealistic styles.

Voodoo3 Series of gaming video cards

Voodoo3 was a series of computer gaming video cards manufactured and designed by 3dfx Interactive. It was the successor to the company's high-end Voodoo2 line and was based heavily upon the older Voodoo Banshee product. Voodoo3 was announced at COMDEX '98 and arrived on store shelves in early 1999. The Voodoo3 line was the first product manufactured by the combined STB Systems and 3dfx.

Tiled rendering is the process of subdividing a computer graphics image by a regular grid in optical space and rendering each section of the grid, or tile, separately. The advantage to this design is that the amount of memory and bandwidth is reduced compared to immediate mode rendering systems that draw the entire frame at once. This has made tile rendering systems particularly common for low-power handheld device use. Tiled rendering is sometimes known as a "sort middle" architecture, because it performs the sorting of the geometry in the middle of the graphics pipeline instead of near the end.

Micro stuttering is a term used in computing to describe a quality defect that manifests as irregular delays between frames rendered by the GPU(s), causing the instantaneous frame rate of the longest delay to be significantly lower than the frame rate reported by benchmarking applications, such as 3DMark, as they usually calculate the average frame rate over a longer time interval.

Voodoo2 Series of GPUs

The Voodoo2 is a set of three specialized 3D graphics chips on a single chipset setup, made by 3dfx. It was released in February 1998 as a replacement for the original Voodoo Graphics chipset. The card runs at a chipset clock rate of 90 MHz and uses 100 MHz EDO DRAM, and is available for the PCI interface. The Voodoo2 comes in two models, one with 8 MB RAM and one with 12 MB RAM. The 8 MB card has 2 MB of memory per texture mapping unit (TMU) vs. 4 MB on the 12 MB model. The 4 MB framebuffer on both cards support a maximum screen resolution of 800 × 600, while the increased texture memory on the 12 MB card allows more detailed textures. Some boards with 8 MB can be upgraded to 12 MB with an additional daughter board.

GeForce 10 series Series of GPUs by Nvidia

The GeForce 10 series is a series of graphics processing units developed by Nvidia, initially based on the Pascal microarchitecture announced in March 2014. This design series succeeded the GeForce 900 series, and is succeeded by the GeForce 16 series and GeForce 20 series using the Turing microarchitecture.

Deep learning super sampling (DLSS) is a machine-learning and spatial image upscaling technology developed by Nvidia and exclusive to its graphics cards for real-time use in select video games, using deep learning to upscale lower-resolution images to a higher resolution for display on higher-resolution computer monitors. Nvidia claims this technology upscales images with quality similar to that of rendering the image natively in higher resolution but with less computation done by the video card, allowing for higher graphical settings and frame rates for a given resolution.

References

  1. Maximum PC, Future US, Inc.: 26, Autumn 2006, ISSN   1522-4279 {{citation}}: CS1 maint: untitled periodical (link)