RIVA128ZX Datasheet, PDF (11/85 Pages) STMicroelectronics – 128-BIT 3D MULTIMEDIA ACCELERATOR

128-BIT 3D MULTIMEDIA ACCELERATOR
RIVA128ZX
• Fully supports the “Execute” model on both PCI
and AGP
3.3 2D ACCELERATION
The RIVA128ZX’s 2D rendering engine delivers
industry-leading Windows acceleration perfor-
mance:
• 100MHz 128-bit graphics engine optimized for
single cycle operation into the 128-bit memory
interface supporting up to 1.6GBytes/s
• Acceleration functions optimized for minimal
software overhead on key GDI calls
• Extensive support for DirectDraw in
Windows95 including optimized Direct Frame-
buffer (DFB) access with Write-combining
• Accelerated primitives including BLT, transpar-
ent BLT, stretchBLT, points, lins, lines,
polylines, polygons, fills, patterns, arbitrary
rectangular clipping and improved text render-
ing
• Pipeline optimized for multiple color depths in-
cluding 8, 15, 24, and 30 bits per pixel
• DMA Pusher allows the 2D graphics pipeline to
load rendering methods optimizing
RIVA128ZX/host multi-tasking
• Execution of all 256 Raster Operations (as de-
fined by Microsoft Windows) at 8, 15, 24 and
30-bit color depths
• 15-bit hardware color cursor
• Hardware color dithering
• Multi buffering (Double, Triple, Quad buffering)
for smooth animation
3.4 3D ENGINE
Triangle setup engine
• Setup hardware optimized for Microsoft’s
Direct3D API
• 5Gflop floating point geometry processor
• Slope and setup calculations
• Accepts IEEE Single Precision format used in
Direct3D
• Efficient vertex caching
Rendering engine
The RIVA128ZX Multimedia Accelerator inte-
grates an orthodox 3D rendering pipeline and tri-
angle setup function which not only fully utilizes
the capabilities of the Accelerated Graphics Port,
but also supports advanced texture mapped 3D
over the PCI bus. The RIVA128ZX 3D pipeline of-
fers to Direct3D or similar APIs advanced triangle
rendering capabilities:
• Rendering pipeline optimized for Microsoft’s
Direct3D API
• Perspective correct true-color Gouraud lighting
and texture mapping
• Full 32-bit RGBA texture filter and Gouraud
lighting pixel data path
• Alpha blending for translucency and transpar-
ency
• Sub-pixel accurate texture mapping
• Internal pixel path: up to 24bits, alpha: up to 8
bits
• Texture magnification filtering with high quality
bilinear filtering without performance degrada-
tion
• Texture minification filtering with MIP mapping
without performance degradation
• LOD MIP-mapping: filter shape is dynamically
adjusted based on surface orientation
• Texture sizes from 4 to 2048 texels in either U
or V
• Textures can be looped and paged in real time
for texture animation
• Perspective correct per-pixel fog for atmo-
spheric effects
• Perspective correct specular highlights
• Multi buffering (Double, Triple, Quad buffering)
for smooth 3D animation
• Multipass rendering for environmental mapping
and advanced texturing
3.5 VIDEO PROCESSOR
The RIVA128ZX Palette-DAC pipeline accelerates
full-motion video playback, sustaining 30 frames
per second while retaining the highest quality color
resolution, implementing true bilinear filtering for
scaled video, and compensating for filtering losses
using edge enhancement algorithms.
• Advanced support for DirectDraw (DirectVideo)
in Windows 95
• Back-end hardware video scaling for video con-
ferencing and playback
• Hardware color space conversion (YUV 4:2:2
and 4:2:0)
• Multi-tap X and Y filtering for superior image
quality
• Optional edge enhancement to retain video
sharpness
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