Asus AGP-V5200, Руководство пользователя

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25 The Ultimate Windows NT Workstation Graphics Accelerator
Palette Texture Extension
The AGP-V5200 provides direct support for palette textures, where each texel
represents an index into an on-chip RGBA (8-bits per component) lookup-table.
An OpenGL palette texture extension has been defined by Microsoft, which is
supported by 3Dlabs OpenGL ICD from release 1.0.11. The supported texel depths
are 1, 2, 4, and 8 bit texel depths.
Besides improving texture performance and reducing the memory requirements
for storing textures in the local buffer by repeatedly updating the texture LUT,
animation effects, such as real-time color cycling, are also possible.
If many textures share the same look-up table (LUT), performance gains can
be obtained with paletted texture objects by forcing the textures to share the
same palette (particularly for 8-bit palette textures on the GLINT MX). The
default behavior when texture switching through calls to
glBindTexture
is to
send down the LUT on every switch. This can be disabled by the
EXT_shared_texture_palette
extension.
Driver Extension
In addition to the extensions mentioned earlier, the
3Dlabs_DriverState
extension
has been added. This extension is simply a mechanism for adding extra state to
the Client Driver and adds extra control to the currently selected context.
Swap Hint Extension
The AGP-V5200 supports the Microsoft-defined extension
GL_WIN_swap_hint
.
This extension allows the area of a window swapped by the SwapBuffers call
to be restricted. This can give performance benefits when only a small area of
the display is being updated at a time. For more information, contact Microsoft
directly or search in the latest Win32 help files for
glAddSwapHintRectWIN.
Kinetix Buffer Region Extension
This extension was specified and implemented as an optimization for 3D Studio
MAX
®
2. It can be freely used within other applications that could benefit
from it. The extension allows areas of frame, depth and stencil buffer to be
stored away and later repaired. 3D Studio MAX
®
2 uses the extension to
optimize display when a single object is being edited within a complex scene.