RIVA128 datasheet(12/77 Pages) STMICROELECTRONICS

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128-BIT 3D MULTIMEDIA ACCELERATOR

RIVA 128

12/77

3.3

2D ACCELERATION

The RIVA 128's 2D rendering engine delivers in-

dustry-leading

Windows

acceleration

perfor-

mance:

• 100MHz 128-bit graphics engine optimized for

single cycle operation into the 128-bit SGRAM

interface supporting up to 1.6GBytes/s

• Acceleration functions optimized for minimal

software overhead on key GDI calls

• Extensive

support

for

DirectDraw

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 RIVA 128/

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 RIVA 128 Multimedia Accelerator integrates

an orthodox 3D rendering pipeline and triangle

setup function which not only fully utilizes the ca-

pabilities of the Accelerated Graphics Port, but

also supports advanced texture mapped 3D over

the PCI bus. The RIVA 128 3D pipeline offers to

Direct3D or similar APIs advanced triangle render-

ing 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 RIVA 128 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

• Support for scaled field interframing for reduced

motion artifacts and reduced storage

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