NVIDIA GeForce 7800 GTX Review
High Dynamic Range
CineFX 4.0 includes a redesigned texture processing engine and
NVIDIA claims that the G70 will deliver up to 60% HDR improvement over the
NV40/45. Textures can be grabbed and accessed faster and with NVIDIA’s 64-bit
texture filtering and blending technology, developers now can easily take
advantage of advanced shading, blending, filtering, and texturing capabilities
to create accurate effects such as iridescence, motion blur, and soft shadows.
These improvements deliver major benefits for high-precision texture
applications such as high dynamic-range (HDR) rendering. Anisotropic filtering
also benefits from the improved cache design of the latest texture engine.
Transparency Antialiasing & Gamma Correct
In games, when AA is enabled, the fine-line objects such as
chain-linked fences, trees and foliages that has transparency in them looks
awful with jagged and broken edges. Therefore NVIDIA comes out with a new AA
mode known as Transparency AA for G70 that will enhance the image quality of
those textures. Another neat feature NVIDIA offers for its G70 is the
gamma-correct antialiasing while maintaining 128-bit color precision at
virtually no performance hit.
LongHorn & WGF 1.0 Support
NVIDIA CineFX 4.0 engine supports the Microsoft Longhorn OS and
the Microsoft Windows Graphics Foundation 1.0 standard. Powered by the
composited desktop hardware engine, many graphics advancements will be available
right on the desktop. These advancements include:
Real-time desktop compositing
Seamless multiple 3D applications
Accelerated antialiased text rendering
Special effects and animation
Microsoft is currently developing WGF 1.0 together with major
graphics chip makers like ATI and NVIDIA. WCG 1.0 is the interface for Avalon,
the core of Longhorn user interface and will incorporate DirectX 9.0L as its
primary interface as well as the support for Longhorn Display Driver Model (LDDM).
DirectX 9.0L will offer DX9.0c features with a number of new features such as
cross-process shared surfaces, managed graphics memory, prioritization of
resources, text anti-aliasing, advanced gamma functions. LDDM "Basic" driver model support virtualization with a scheduler to control the data flow that enables
multiple applications to share the GPU computing power and other cool features
such as installing graphics card drivers without the need to reboot the system.
When Longhorn starts shipping in 2006, it will have the next generation API
known as WGF 2.0 with LDDM "Advanced" with improved virtualization techniques
and new pipeline stages.
NVIDIA Pure Video Technology
NVIDIA PureVideo technology has existed in the NV45 series that
has built-in Video Processing Engine (VPE) to accelerate encoding and decoding
of video formats like WMV. Now G70 offers more video processing power and sports
a cool new feature known as High-Definition Spatial-Temporal De-Interlacing that remove motion artifacts like the common feathering problem
on progressive displays to
deliver clear and smooth video. The next generation PureVideo H.264 will be
available during Christmas 2005 and NVIDIA is working directly with ISVs such as
Cyberlink and IVI to power their H.264 decoders. Some H.264 applications include
Blu-Ray and HD-DVD.