SGI VPro
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VPro, also known as Odyssey, is a computer graphics architecture for Silicon Graphics workstations. First released on the Octane2, it was subsequently used on the Fuel and Tezro workstations.
VPro provides some very advanced capabilities such as per-pixel lighting, also known as "phong shading", (through the SGIX_fragment_lighting [1] extension) and 48-bit RGBA color.
There are currently four different VPro graphics board revisions, called: V6, V8, V10 and V12. The first series were the V6 and V8, with 32MB and 128MB of RAM respectively. The V10 and V12 had double the geometry performance of the older V6/V8, but were otherwise similar. The V6 and V10 can have up to 8MB RAM allocated to textures, while V8 and V12 can have up to 108MB RAM used for textures.
The VPro graphics subsystem consists of an SGI proprietary chip set and associated software. The chip set consists of the buzz ASIC, the pixel blaster and jammer (PB&J) ASIC, and associated SDRAM.
The buzz ASIC is a single-chip graphics pipeline. It operates at 251 MHz and contains on-chip SRAM. The buzz ASIC has three interfaces:
- Host (16-bit, 400-MHz peer-to-peer XIO link)
- SDRAM (The SDRAM is 32 MB (V6 or V10) or 128 MB (V8 or V12); the memory bus operates at half the speed of the buzz ASIC.)
- PB&J ASIC
All VPro boards support the OpenGL ARB imaging extensions, allowing for hardware acceleration of numerous imaging operations at real-time rates.
[edit] VPro Series
| Model | Colour depth | Memory | Texture memory (maximum) | Geometry engine speed |
| V6 | 48-bit RGBA | 32 MB | 8 MB | Original |
| V8 | 48-bit RGBA | 128 MB | 104 MB | Original |
| V10 | 48-bit RGBA | 32 MB | 8 MB | 2× original |
| V12 | 48-bit RGBA | 128 MB | 104 MB | 2× original |
