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Adam Jackson
0a31a44865
Spatial dither is better than nothing, but ST is even better. (from ajax's followup message:) I noticed this with: http://ajax.fedorapeople.org/YellowFlower.jpg set as my desktop background in Gnome on a 1280x800 machine (in particular, a Sony Vaio VPCB1 with 6-bit panel and a rather bright black level). Easiest way to test this is by poking at PIPEACONF with intel_reg_write directly: % sudo intel_reg_write 0x70008 0xc0000040 # no dither % sudo intel_reg_write 0x70008 0xc0000050 # spatial % sudo intel_reg_write 0x70008 0xc0000054 # ST I notice it especially strongly in the relatively flat dark area in the top left. Closer than about 18" I can see a noticeable checkerboard pattern with plain spatial dithering. ST smooths that out; I can still tell that it's lacking color precision, but it's not offensive. Signed-off-by: Adam Jackson <ajax@redhat.com> Signed-off-by: Eric Anholt <eric@anholt.net>
************************************************************
* For the very latest on DRI development, please see: *
* http://dri.freedesktop.org/ *
************************************************************
The Direct Rendering Manager (drm) is a device-independent kernel-level
device driver that provides support for the XFree86 Direct Rendering
Infrastructure (DRI).
The DRM supports the Direct Rendering Infrastructure (DRI) in four major
ways:
1. The DRM provides synchronized access to the graphics hardware via
the use of an optimized two-tiered lock.
2. The DRM enforces the DRI security policy for access to the graphics
hardware by only allowing authenticated X11 clients access to
restricted regions of memory.
3. The DRM provides a generic DMA engine, complete with multiple
queues and the ability to detect the need for an OpenGL context
switch.
4. The DRM is extensible via the use of small device-specific modules
that rely extensively on the API exported by the DRM module.
Documentation on the DRI is available from:
http://dri.freedesktop.org/wiki/Documentation
http://sourceforge.net/project/showfiles.php?group_id=387
http://dri.sourceforge.net/doc/
For specific information about kernel-level support, see:
The Direct Rendering Manager, Kernel Support for the Direct Rendering
Infrastructure
http://dri.sourceforge.net/doc/drm_low_level.html
Hardware Locking for the Direct Rendering Infrastructure
http://dri.sourceforge.net/doc/hardware_locking_low_level.html
A Security Analysis of the Direct Rendering Infrastructure
http://dri.sourceforge.net/doc/security_low_level.html