HP X Class 500/550MHz, Reference Manual

Page: 72 / 149

72 Chapter 3
Interface Boards and Mass-Storage Drivers
HP Visualize fx OpenGL 3D Graphics Hardware Accelerator
Features
The HP V
ISUALIZE
fx Open GL 3D graphics hardware accelerator includes the following
main features:
• Dual slot solution: (1 AGP + 1 PCI).
• Geometry engine using dedicated PA-RISC floating-point cells.
• Up to 1600
×
1200 true color single buffered at 75 Hz, or 1280
×
1024 true color double
buffered at 85 Hz.
• 18 MB of video memory (100 MHz SGRAM).
• VGA supported via daughter board.
• Texture module (optional) with up to 32 MB of additional SDRAM memory.
• Fog.
• Alpha blending.
• Stereo capability in separate window (requires special stereo device).
• Anti-aliased points and vectors.
• HP Color Recovery Dithering and HP Occlusion Culling Extension.
Graphics Board Architecture
The HP V
ISUALIZE
fx Open GL 3D graphics hardware accelerator is actually made up of
several graphics boards:
• The main board contains the bridge chip (which provides the interface to the AGP bus),
two geometry accelerators, frame buffer memory, two rasterizer chips and the
RAMDAC chip.
• A VGA board is connected to the main board such that the video output is analog
switched between the RAMDAC and the VGA chip.
• An optional texture board with a dual texture mapping chip and 32 MB of SDRAM
memory, running at 100 MHz, that may be installed as an accessory.
The block diagram below shows the architecture of the HP V
ISUALIZE
fx Open GL 3D
graphics hardware accelerator: