GTK is a multi-platform toolkit for creating graphical user interfaces.
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Alexander Larsson 038aac6275 gdk: Add support for OpenGL
This adds the new type GdkGLContext that wraps an OpenGL context for a
particular native window. It also adds support for the gdk paint
machinery to use OpenGL to draw everything. As soon as anyone creates
a GL context for a native window we create a "paint context" for that
GdkWindow and switch to using GL for painting it.

This commit contains only an implementation for X11 (using GLX).

The way painting works is that all client gl contexts draw into
offscreen buffers rather than directly to the back buffer, and the
way something gets onto the window is by using gdk_cairo_draw_from_gl()
to draw part of that buffer onto the draw cairo context.

As a fallback (if we're doing redirected drawing or some effect like a
cairo_push_group()) we read back the gl buffer into memory and composite
using cairo. This means that GL rendering works in all cases, including
rendering to a PDF. However, this is not particularly fast.

In the *typical* case, where we're drawing directly to the window in
the regular paint loop we hit the fast path. The fast path uses opengl
to draw the buffer to the window back buffer, either by blitting or
texturing. Then we track the region that was drawn, and when the draw
ends we paint the normal cairo surface to the window (using
texture-from-pixmap in the X11 case, or texture from cairo image
otherwise) in the regions where there is no gl painted.

There are some complexities wrt layering of gl and cairo areas though:
* We track via gdk_window_mark_paint_from_clip() whenever gtk is
  painting over a region we previously rendered with opengl
  (flushed_region). This area (needs_blend_region) is blended
  rather than copied at the end of the frame.
* If we're drawing a gl texture with alpha we first copy the current
  cairo_surface inside the target region to the back buffer before
  we blend over it.

These two operations allow us full stacking of transparent gl and cairo
regions.
2014-10-13 10:43:31 -04:00
build Update README.txt for MSVC Builds 2014-09-30 13:01:17 +08:00
demos gtk3-demo: Don't use deprecated API 2014-10-07 00:48:30 -04:00
docs gdk: Add support for OpenGL 2014-10-13 10:43:31 -04:00
examples examples: Add deprecation guards 2014-10-12 05:51:11 +02:00
gdk gdk: Add support for OpenGL 2014-10-13 10:43:31 -04:00
gtk Add gdk_window_mark_paint_from_clip and call from widget drawing 2014-10-13 10:43:31 -04:00
libgail-util libgail: Add deprecation guards 2014-10-03 15:51:45 +02:00
m4 Do not use AC_CANONICAL_TARGET 2013-06-02 11:03:08 +02:00
m4macros Deprecate GTK_CHECK_BACKEND in favour of PKG_CHECK_MODULES 2014-08-21 09:54:38 +01:00
modules Get duplex option via IPP 2014-10-13 11:58:18 +02:00
po Updated Slovak translation 2014-10-12 21:06:29 +00:00
po-properties Updated POTFILES.in and POTFILES.skip 2014-10-12 15:06:38 +02:00
tests tests: Update testexpand example for deprecations 2014-10-12 05:27:27 +02:00
testsuite GtkBuilder: Undo the type name heuristic changes 2014-10-03 09:29:45 -04:00
util Make non-ASCII strings in ui files work 2014-10-02 21:28:43 -04:00
acinclude.m4 Copy newer versions of JH_CHECK_XML_CATALOG and JH_PATH_XML_CATALOG from 2003-08-10 22:30:02 +00:00
AUTHORS small update 2006-03-24 03:09:08 +00:00
autogen.sh autogen.sh: fail faster/clearer if g-i not found 2014-03-02 09:51:47 +01:00
config.h.win32.in Update config.h.win32.in for Visual C++ 2013 2013-12-18 11:43:49 +08:00
configure.ac build: Require libepoxy 2014-10-13 10:43:31 -04:00
COPYING Change FSF Address 2012-02-27 17:06:11 +00:00
gail-3.0.pc.in Bump the version to 3.0.0 2011-02-10 14:41:02 -05:00
gdk-3.0.pc.in Try to fix linking 2011-12-05 20:58:21 -05:00
git.mk Update git.mk 2014-06-19 11:13:47 -04:00
gtk-zip.sh.in Drop gdk-pixbuf files 2010-06-27 23:30:02 +03:00
gtk+-3.0.pc.in Move pangoft2 to Requires.private 2011-11-22 09:42:31 -05:00
gtk+-unix-print-3.0.pc.in configure.ac: Support multiple GDK backends in one build 2011-01-03 11:59:45 -05:00
gtk+.doap doap category core 2014-07-30 15:53:33 +02:00
HACKING Some updates 2011-01-30 02:57:59 -05:00
INSTALL.in Update installation instructions for 3.6 2012-09-24 18:53:03 -04:00
MAINTAINERS update file format 2007-08-08 03:11:35 +00:00
Makefile.am Drop another old, unused script 2014-09-21 23:17:52 -04:00
Makefile.decl build: Set no_undefined in Makefile.decl 2014-09-15 16:35:40 +02:00
makefile.msc win32: update msvc build 2011-01-02 13:33:06 +01:00
NEWS 3.14.1 2014-09-29 21:37:36 -04:00
NEWS.pre-1-0 ooops, fogot this on my last commit... 1998-05-07 07:45:04 +00:00
README.commits Update README files to refer to git 2009-03-31 19:34:23 -04:00
README.in Add a note about text view issues 2014-10-09 18:13:53 -04:00
README.win32 Update README.win32 and Visual C++ Readme.txt's 2011-08-31 14:28:47 +08:00
sanitize-la.sh Some people use a hacked libtool that doesn't even install .la files 2010-04-12 13:42:31 +03:00

The Win32 backend in GTK+ is not as stable or correct as the X11 one.

For prebuilt runtime and developer packages see
http://ftp.gnome.org/pub/gnome/binaries/win32/

Building GTK+ on Win32
======================

First you obviously need developer packages for the compile-time
dependencies: GDK-Pixbuf, Pango, atk, glib, gettext-runtime, libiconv at least.
See http://ftp.gnome.org/pub/gnome/binaries/win32/dependencies .

For people compiling GTK+ with Visual C++ 2005 or later, it is
recommended that the same compiler is used for at least GDK-Pixbuf,
Pango, atk and glib so that crashes and errors caused by different CRTs
can be avoided.  The VS 2008 project files and/or VS Makefiles are
either already available or will be available in the next stable release.
Unfortunately compiling with Microsoft's compilers versions 2003 or earlier
is not supported as compiling the latest stable GLib (which *is* required for
building this GTK+ release) requires features from newer compilers
and/or Platform SDKs

After installing the dependencies, there are two ways to build GTK+
for win32.

1) GNU tools, ./configure && make install
-----------------------------------------

This requires you have mingw and MSYS.

Use the configure script, and the resulting Makefiles (which use
libtool and gcc to do the compilation). I use this myself, but it can
be hard to setup correctly.

The full script I run to build GTK+ 2.16 unpacked from a source
distribution is as below. This is from bulding GTK+ 2.16.5. I don't
use any script like this to build the development branch, as I don't
distribute any binaries from development branches.

# This is a shell script that calls functions and scripts from
# tml@iki.fi's personal work envíronment. It is not expected to be
# usable unmodified by others, and is included only for reference.

MOD=gtk+
VER=2.16.5
REV=1
ARCH=win32

THIS=${MOD}_${VER}-${REV}_${ARCH}

RUNZIP=${MOD}_${VER}-${REV}_${ARCH}.zip
DEVZIP=${MOD}-dev_${VER}-${REV}_${ARCH}.zip

HEX=`echo $THIS | md5sum | cut -d' ' -f1`
TARGET=c:/devel/target/$HEX

usedev
usemsvs6

(

set -x

DEPS=`latest --arch=${ARCH} glib atk cairo pango libpng zlib libtiff jpeg`
PROXY_LIBINTL=`latest --arch=${ARCH} proxy-libintl`

PKG_CONFIG_PATH=
for D in $DEPS; do
    PATH=/devel/dist/${ARCH}/$D/bin:$PATH
    [ -d /devel/dist/${ARCH}/$D/lib/pkgconfig ] && PKG_CONFIG_PATH=/devel/dist/${ARCH}/$D/lib/pkgconfig:$PKG_CONFIG_PATH
done

LIBPNG=`latest --arch=${ARCH} libpng`
ZLIB=`latest --arch=${ARCH} zlib`
LIBTIFF=`latest --arch=${ARCH} libtiff`
JPEG=`latest --arch=${ARCH} jpeg`

patch -p0 <<'EOF'
EOF

lt_cv_deplibs_check_method='pass_all' \
CC='gcc -mtune=pentium3 -mthreads' \
CPPFLAGS="-I/devel/dist/${ARCH}/${LIBPNG}/include \
-I/devel/dist/${ARCH}/${ZLIB}/include \
-I/devel/dist/${ARCH}/${LIBTIFF}/include \
-I/devel/dist/${ARCH}/${JPEG}/include \
-I/devel/dist/${ARCH}/${PROXY_LIBINTL}/include" \
LDFLAGS="-L/devel/dist/${ARCH}/${LIBPNG}/lib \
-L/devel/dist/${ARCH}/${ZLIB}/lib \
-L/devel/dist/${ARCH}/${LIBTIFF}/lib \
-L/devel/dist/${ARCH}/${JPEG}/lib \
-L/devel/dist/${ARCH}/${PROXY_LIBINTL}/lib -Wl,--exclude-libs=libintl.a \
-Wl,--enable-auto-image-base" \
LIBS=-lintl \
CFLAGS=-O2 \
./configure \
--enable-win32-backend \
--disable-gdiplus \
--with-included-immodules \
--without-libjasper \
--enable-debug=yes \
--enable-explicit-deps=no \
--disable-gtk-doc \
--disable-static \
--prefix=$TARGET &&

libtoolcacheize &&
rm gtk/gtk.def &&
(PATH="$PWD/gdk-pixbuf/.libs:/devel/target/$HEX/bin:$PATH" make -j3 install || (rm .libtool-cache* && PATH="/devel/target/$HEX/bin:$PATH" make -j3 install)) &&

PATH="/devel/target/$HEX/bin:$PATH" gdk-pixbuf-query-loaders >/devel/target/$HEX/etc/gtk-2.0/gdk-pixbuf.loaders &&

grep -v -E 'Automatically generated|Created by|LoaderDir =' <$TARGET/etc/gtk-2.0/gdk-pixbuf.loaders >$TARGET/etc/gtk-2.0/gdk-pixbuf.loaders.temp &&
    mv $TARGET/etc/gtk-2.0/gdk-pixbuf.loaders.temp $TARGET/etc/gtk-2.0/gdk-pixbuf.loaders &&
grep -v -E 'Automatically generated|Created by|ModulesPath =' <$TARGET/etc/gtk-2.0/gtk.immodules >$TARGET/etc/gtk-2.0/gtk.immodules.temp &&
    mv $TARGET/etc/gtk-2.0/gtk.immodules.temp $TARGET/etc/gtk-2.0/gtk.immodules &&

./gtk-zip.sh &&

mv /tmp/${MOD}-${VER}.zip /tmp/$RUNZIP &&
mv /tmp/${MOD}-dev-${VER}.zip /tmp/$DEVZIP

) 2>&1 | tee /devel/src/tml/packaging/$THIS.log

(cd /devel && zip /tmp/$DEVZIP src/tml/packaging/$THIS.{sh,log}) &&
manifestify /tmp/$RUNZIP /tmp/$DEVZIP

You should not just copy the above blindly. There are some things in
the script that are very specific to *my* build setup on *my* current
machine. For instance the "latest" command, the "usedev" and
"usemsvs6" shell functions, the /devel/dist folder. The above script
is really just meant for reference, to give an idea. You really need
to understand what things like PKG_CONFIG_PATH are and set them up
properly after installing the dependencies before building GTK+.

As you see above, after running configure, one can just say "make
install", like on Unix. A post-build fix is needed, running
gdk-pixbuf-query-loaders once more to get a correct gdk-pixbuf.loaders
file.

For a 64-bit build you need to remove the gtk/gtk.def file and let it
be regenerated by the makefilery. This is because the 64-bit GTK dll
has a slightly different list of exported function names. This is on
purpose and not a bug. The API is the same at the source level, and
the same #defines of some function names to actually have a _utf8
suffix is used (just to keep the header simpler). But the
corresponding non-suffixed function to maintain ABI stability are not
needed in the 64-bit case (because there are no older EXEs around that
would require such for ABI stability).


2) Microsoft's tools
--------------------

Use the Microsoft compiler, cl and Make, nmake. Say nmake -f
makefile.msc in gdk and gtk. Be prepared to manually edit various
makefile.msc files, and the makefile snippets in build/win32.

There are also VS 2008/2010 solution and project files to build GTK+, which
are maintained by Chun-wei Fan.  They should build GTK+ out of the box,
provided that the afore-mentioned dependencies are installed.  They will
build GDK with the Win32 backend, GTK+ itself (with GAIL/a11y built in),
the GAIL-Util library and the gtk-demo program.

Please refer to the following GNOME Live! page for a more detailed ouline
on the process of building the GTK+ stack and its dependencies with Visual
C++:

https://live.gnome.org/GTK%2B/Win32/MSVCCompilationOfGTKStack

Alternative 1 also generates Microsoft import libraries (.lib), if you
have lib.exe available. It might also work for cross-compilation from
Unix.

I (Tor) use method 1 myself. Hans Breuer has been taking care of the MSVC
makefiles. At times, we disagree a bit about various issues, and for
instance the makefile.msc files might not produce identically named
DLLs and import libraries as the "autoconfiscated" makefiles and
libtool do. If this bothers you, you will have to fix the makefiles.

Using GTK+ on Win32
===================

To use GTK+ on Win32, you also need either one of the above mentioned
compilers. Other compilers might work, but don't count on it. Look for
prebuilt developer packages (DLLs, import libraries, headers) on the
above website.

Multi-threaded use of GTK+ on Win32
===================================

Multi-threaded GTK+ programs might work on Windows in special simple
cases, but not in general. Sorry. If you have all GTK+ and GDK calls
in the same thread, it might work. Otherwise, probably not at
all. Possible ways to fix this are being investigated.

Wintab
======

The tablet support uses the Wintab API. The Wintab development kit is
no longer required. The wintab.h header file is bundled with GTK+
sources. Unfortunately it seems that only Wacom tablets come with
support for the Wintab API nowadays.

--Tor Lillqvist <tml@iki.fi>, <tml@novell.com>
--Updated by Fan, Chun-wei <fanc999@yahoo.com.tw>