Frame Buffer - Intergraph RealiZm Graphics Z10 Hardware User's Manual

MIP-Mapping Support with Trilinear Interpolation
The Texture Processor allows various sizes of texture maps to coexist in texture memory.
Different MIP (multum in parvo -- many things in a small place) maps allow the appropriate
level of detail to be shown based on viewing distance. The Texture Processor chooses four
texels nearest the actual texel value from each of the nearest two MIP maps (for a total of
eight texels). The Texture Processor blends the eight texels to produce the actual texel value
by using trilinear interpolation.

Frame Buffer

The RealiZm Frame Buffers are full-featured: Their deep pixel formats provide a flexible
environment for applications with hardware acceleration. For example, double-buffered
overlay planes provide the ability to annotate text and graphics over a 3D image in the image
buffer. Both image buffers have access to one of four video lookup tables (VLTs). The image
VLT selection planes select the VLT to use. The mask planes allow for access control of the
various drawing planes (for example, image or overlay). The image and overlay buffer
selection control planes determine the buffer to display on a pixel-by-pixel basis. Other
features include support of a wide variety of displays operating at high resolution.
Video Planes
Z10 supports 84 bits-per-pixel plane sets, and Z10-T supports 90 bits-per-pixel configurations,
as summarized in the following table:
Video Plane Sets
Image (red, green, blue), front buffer
Image (red, green, blue), back buffer
Overlay, front buffer
Overlay, back buffer
Image, VLT selection, front buffer
Image, VLT selection, back buffer
Z buffer
Mask (pixel access control)
Image, window control
Overlay, window control
Z13, Z25, and V25 support two plane set configurations: 100 bits-per-pixel and 128 bits-per-
pixel. The 128 bits-per-pixel mode is supported at resolutions slightly less than the maximum.
For example, the Z25 supports 128 bits-per-pixel up to maximum resolution of 2 Mpixel
(1600 x 1200) and 100 bits-per-pixel for a resolution of 2.5 Mpixel (1824 x 1368).
84 Bits/Pixel 90 Bits/Pixel
24 24
24 24
1 4
1 4
3 3
3 3
24 24
2 2
1 1
1 1
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