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glamor: Add Option "ShadowPrimary" v2

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When this option is enabled, most pixmaps (including the screen pixmap)
are allocated in system RAM and mostly accessed by the CPU. Changed areas
of the screen pixmap are copied to dedicated per-CRTC scanout pixmaps
regularly, triggered by the vblank interrupt.

v2:
* Set region data pointer to NULL for keeping only the extents
* Move pRegion and pBox local variable declarations closer to their uses
  in drmmode_set_mode_major()
This commit is contained in:
Michel Dänzer
2015-03-18 16:23:24 +09:00
committed by Michel Dänzer
parent eea79472a8
commit ae92d1765f
10 changed files with 372 additions and 22 deletions
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16
man/radeon.man
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@@ -286,6 +286,22 @@ Chooses between available acceleration architectures. Valid values are
as of TAHITI, otherwise
.B EXA.
.PP
The following driver
.B Options
are supported for
.B glamor
:
.TP
.BI "Option \*qShadowPrimary\*q \*q" boolean \*q
This option enables a so-called "shadow primary" buffer for fast CPU access to
pixel data, and separate scanout buffers for each display controller (CRTC).
This may improve performance for some 2D workloads, potentially at the expense
of other (e.g. 3D, video) workloads.
Note in particular that enabling this option currently disables page flipping.
The default is
.B off.
.PP
The following driver
.B Options