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RIVA128ZX

128-BIT 3D MULTIMEDIA ACCELERATOR

STMicroelectronics 

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

11/85

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