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Appendix D: On-Board Video
Appendix D
On-Board
Video Controller
The Raptor MicroATX has an On-board video controller/LCD
(optional). The On-board video controller is based on the Intel 82815
GMCH.
82815 GMCH Integrated Graphics Support
The GMCH includes a highly integrated graphics accelerator. Its
architecture consists of dedicated multi-media engines executing in
parallel to deliver high performance 3D, 2D, and motion compensation
video capabilities. The 3D and 2D engines are managed by a 3D/2D
pipeline preprocessor allowing a sustained flow of graphics data to be
rendered and displayed. The deeply pipelined 3D accelerator engine
provides 3D graphics quality and performance via per-pixel 3D
rendering and parallel data paths which allow each pipeline stage to
simultaneously operate on different primitives or portions of the same
primitive.
The
GMCH
graphics
accelerator
engine
supports
perspective-correct texture mapping, trilinear and anisotropic Mip-Map
filtering, Gouraud shading, alpha-blending, fogging and Z-buffering. A
rich set of 3D instructions permit these features to be independently
enabled or disabled. For the GMCH, a Display Cache (DC) can be used
for the Z-buffer (textures and display buffer(s) are located only in
system memory). If the display cache is not used, the Z-buffer is
located in system memory.
The GMCH integrated graphics accelerator's 2D capabilities include
BLT and arithmetic STRBLT engines, a hardware cursor and an
extensive set of 2D registers and instructions. The high performance
64-bit BitBLT engine provides hardware acceleration for many
common Windows operations. In addition to its 2D/3D capabilities, the
GMCH integrated graphics accelerator also supports full MPEG-2
motion compensation for software-assisted DVD video playback, a
VESA DDC2B compliant display interface and a digital video out port
which may support (via an external TMDS transmitter) digital Flat
Panel or Digital CRT displays.
DVO
The GMCH provides interfaces to a standard progressive scan monitor,
and TMDS transmitter. These interfaces are only active when running
in internal graphics mode.
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