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= What's New =
The latest version is 0.4. Here is the new features in this releae:
1. DRI2 now works well, and texture-from-pixmap also works well.
2. Fully support glx including AIGLX, indirect glx's GL context
coexists with glamor's GL context safely. Thanks for Chris
Wilson's help to refine this function.
3. Optimize most of the fallback path and avoid whole pixmap
downloading/uploading as much as possible.
4. 1BPP picture uploading now will not fallback the whole rendering
path.
5. Fully support all color formats for GLES2 port. Thanks for
Lipeng's contribution and testing for the GLES2 port on
PVR545 platform. And thanks Zhengyu to fix some PVR releated problems.
6. Fixed many of the bugs for cairo-test-suite, now we get almost
identical or even better result than UXA.
7. Implemented a fbo/texture cache pool mechanism which will reduce
the over head of texture/fbo destruction and creation, and bring
overall 15-20% performance imprvoement. On PVR545 platform, we
even get about 10x performance improvement with this feature.
= How to Enable Glamor? =
To enable the Glamor, the following steps is needed:
1. Rebuild the mesa using the parameter:
--with-egl-platforms=x11,drm --with-gallium-drivers= --enable-gbm --enable-shared-glapi --enable-glx-tls
2. Rebuild the xf86-video-intel driver, add parameter
--enable-glamor
to enable glamor module which is embedded in intel driver.
3. Build and install glamor source.
4. Make sure you have the xorg configure file named glamor.conf
at conf/glamor.conf under the directory
/usr/share/X11/xorg.conf.d or /etc/X11/xorg.conf.d/.
Although make install will try to install that file to the correct
directory. But it may failed, as if you are installing the xserver
to a local directory, then the "make install" will install
glamor.conf to your local directory rather than the two system
directories. So you may need to manually copy the file to the system's
configuration directory. Otherwise, you will encounter segfault when
start the xserver. Here is teh content of the glamor.conf.
. Section "Module"
. Load "dri2"
. Load "glamoregl"
. EndSection
The reason why we need to load dri2/glamoregl earlier is both glx-xserver
and glamor are a dri2 loader. And glx-xserver side has a own glapi/dispatch table
implementation which is a subset of the standard mesa's implementation. So if
the glx module is loaded earlier than dri2/glamoregl, then we will get an incomplete
dispatch table and everything is broken in glamor then. This is also why we need to
add --enable-glx-tls parameters when build mesa, as we need to keep mesa align
with Xserver's behavious, xserver will enable-glx-tls by default, but mesa will not.
After yuo finish all the above steps, then you can try to start x with glamor enabled
DDX. To make sure it's the glamor running, you can refer to Xorg.0.log, and
check that the Glamor is enabled if you can find the log like:
''__intel(0): Use GLAMOR acceleration.__''
= Plan =
We plan to release next version 0.5 at early of June. And the following major features will be added:
1. Fully gradient optimization including linear and radial. Actually,
the code is already in this release, but as it has some bugs and
we disable it currently. Will fix those bug and enable it at next
release.
2. Large pixmap support. Currently, mesa only support 8Kx8K texture
size, if a pixmap has larger size, we have to store it in main
memory and is not efficient. This feature will tile a large
pixmap to a texture array.
3. Fully trapezoid optimization. Currently, the trapezoid rendering
is not optimized, and it will call pixman to do the rasterization
and then call glamor_composite to do the following composition,
and then many texture uploading overhead is triggered there.
4. Fine tune the fbo cache mechanism.
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