[ANNOUNCEMENT] Updated: mesa-10.2.4-1, mesa-demos-8.2.0-1

[Yaakov Selkowitz <yselkowitz at cygwin dot com>]

The following packages have been updated in the Cygwin distribution:

* dri-drivers-10.2.4-1
* libEGL1-10.2.4-1
* libEGL-devel-10.2.4-1
* libGL1-10.2.4-1
* libGL-devel-10.2.4-1
* libGLESv1_CM1-10.2.4-1
* libGLESv1_CM-devel-10.2.4-1
* libGLESv2_2-10.2.4-1
* libGLESv2-devel-10.2.4-1
* libglapi0-10.2.4-1
* libOpenVG1-10.2.4-1
* libOpenVG-devel-10.2.4-1
* libOSMesa8-10.2.4-1
* libOSMesa-devel-10.2.4-1
* mesa-demos-8.2.0-1

Mesa is an open-source implementation of the OpenGL specification, a
system for rendering interactive 3D graphics.

This is an update to the latest upstream release, with a number of new
features.

Until now, OpenGL has been handled solely with indirect rendering,
meaning that libGL passes calls over the GLX protocol to the server,
which then handles the rendering with hardware acceleration in
multiwindow/-wgl mode, or software rendering (swrast) in desktop/-nowgl
mode.  The major drawback of this method is that the GLX protocol only
supports OpenGL 1.4, anything which requires 2.0 or newer (such as GLSL)
cannot work.

This release adds *direct* rendering support, where libGL handles the
rendering itself via DRI drivers.  This provides complete OpenGL 3.0 and
GLSL 1.30 support (along with numerous newer extensions), allowing much
more OpenGL software to render correctly.  The only drawback at the
moment is that only the llvmpipe DRI driver is current available,
meaning that rendering is done in software and passed to the server over
the X11 protocol, and therefore more CPU intensive.

As this is a new feature, the previous behaviour of indirect rendering
is still the default.  In order to enable direct rendering (and hence
OpenGL 3.0), the following steps are required:

1) If using -multiwindow, the -nowgl flag must be added.

2) Add the following to your ~/.startxwinrc, ~/.xinitrc, or ~/.bashrc,
or run this manually in the shell from which you will launch OpenGL
applications:

unset LIBGL_ALWAYS_INDIRECT

(tcsh users need to use unsetenv instead of unset, of course.)

Other feature changes:

* llvmpipe uses LLVM 3.4 and is now available on x86_64.

* GLES support has been added.

* mesa-demos includes EGL/GLES utilities.

Many thanks to Jon TURNEY for his continued work on OpenGL support which
led to these new features.

-- 
Yaakov
Cygwin/X


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