1 README for Clutter @CLUTTER_VERSION@
2 ===============================================================================
4 Clutter is an open source software library for creating fast, compelling,
5 portable, and dynamic graphical user interfaces.
8 -------------------------------------------------------------------------------
10 Clutter currently requires:
12 • GLib ≥ @GLIB_REQ_VERSION@
13 • Cogl ≥ @COGL_REQ_VERSION@
14 • JSON-GLib ≥ @JSON_GLIB_REQ_VERSION@
15 • Atk ≥ @ATK_REQ_VERSION@
16 • Cairo ≥ @CAIRO_REQ_VERSION@
17 • PangoCairo ≥ @PANGO_REQ_VERSION@
19 When building the X11 backend, Clutter depends on the following extensions:
21 • XComposite ≥ @XCOMPOSITE_REQ_VERSION@
24 • XFixes ≥ @XFIXES_REQ_VERSION@
28 When building the Wayland backend, Clutter also depends on:
33 When building the GDK backend, Clutter also depends on:
35 • gdk-3.0 > @GDK_REQ_VERSION@
37 When building the CEx100 backend, Clutter also depends on:
41 If you are building the API reference you will also need:
43 • GTK-Doc ≥ @GTK_DOC_REQ_VERSION@
45 If you are building the additional documentation you will also need:
48 • jw (optional, for generating PDFs)
50 If you are building the Introspection data you will also need:
52 • GObject-Introspection ≥ @GI_REQ_VERSION@
54 GObject-Introspection is available from:
56 git://git.gnome.org/gobject-introspection
58 If you want support for profiling Clutter you will also need:
60 • UProf ≥ @UPROF_REQ_VERSION@
62 UProf is available from:
64 git://github.com/rib/UProf.git
67 -------------------------------------------------------------------------------
69 The official Clutter website is:
71 http://www.clutter-project.org/
73 The API references for the latest stable release are available at:
75 http://docs.clutter-project.org/docs/clutter/stable/
76 http://docs.clutter-project.org/docs/cogl/stable/
77 http://docs.clutter-project.org/docs/cally/stable/
79 The Clutter Cookbook is available at:
81 http://docs.clutter-project.org/docs/clutter-cookbook/@CLUTTER_API_VERSION@/
83 New releases of Clutter are available at:
85 http://source.clutter-project.org/sources/clutter/
86 http://download.gnome.org/sources/clutter/
88 The Clutter blog is available at:
90 http://www.clutter-project.org/blog/
92 To subscribe to the Clutter mailing lists and read the archives, use the
93 Mailman web interface available at:
95 http://lists.clutter-project.org/
97 New bug page on Bugzilla:
99 http://bugzilla.gnome.org/enter_bug.cgi?product=clutter
101 Clutter is licensed under the terms of the GNU Lesser General Public
102 License, version 2.1 or (at your option) later.
104 BUILDING AND INSTALLATION
105 -------------------------------------------------------------------------------
107 To build Clutter from a release tarball, the usual autotool triad should
114 To build Clutter from a Git clone, run the autogen.sh script instead
115 of the configure one. The autogen.sh script will run the configure script
116 for you, unless the NOCONFIGURE environment variable is set to a non-empty
119 See also the wiki page:
121 http://wiki.clutter-project.org/wiki/BuildingClutter
123 Clutter has additional command line options for the configure script:
125 --enable-debug=[no/minimum/yes]
126 Controls Clutter debugging level:
129 All GLib asserts, checks and support for runtime Clutter
130 debugging notes through CLUTTER_DEBUG. This is the default
131 value for developers snapshots.
134 Just GType cast checks and support for runtime Clutter
135 debugging notes through CLUTTER_DEBUG. This is the default
139 No GLib asserts or checks and no support for runtime Clutter
140 debugging notes. Only use in extreme performance and/or size
141 optimization cases, though it is strongly discouraged.
143 --enable-maintainer-flags=[no/yes/error]
144 Use strict compiler flags. This defaults to 'yes' for building from
145 Git to 'no' for tarball releases. If 'error' is used, then -Werror
146 will be enabled (if available).
149 use gtk-doc to build API documentation (default=no). Requires gtk-doc
150 present on the target system.
152 --enable-docs=[no/yes]
153 Build additional documentation. Requires xsltproc for DocBook
154 conversion, and optionally jw for PDF generation.
156 --enable-gcov=[no/yes]
157 Build Clutter with coverage report support, provided by gcov. This
158 feature only works with the GNU Compiler Suite and gcov installed.
160 --enable-profile=[no/yes]
161 Build Clutter with profiling instrumentation. Requires the GNU
162 C Compiler and the UProf library.
164 --enable-conform=[yes/no]
165 Build the Clutter conformance test suite.
167 --enable-deprecated=[yes/no]
168 Whether deprecated symbols should be available when compiling Clutter.
171 Disable linking with -Bsymbolic.
173 --enable-x11-backend=[yes/no/check]
174 Enable the X11 backend. (default=check)
176 --enable-win32-backend=[yes/no/check]
177 Enable the native Microsoft Windows backend. (default=check)
179 --enable-quartz-backend=[yes/no/check]
180 Enable the native Quartz backend. (default=check)
182 --enable-gdk-backend=[yes/no/check]
183 Enable the GDK backend. (default=check)
185 --enable-wayland-backend=[yes/no]
186 Enable the Wayland client backend. (default=no) [EXPERIMENTAL]
188 --enable-cex100-backend=[yes/no]
189 Enable the CEx100 platform backend. (default=no) [EXPERIMENTAL]
191 --enable-egl-backend=[yes/no]
192 Enable the EGL framebuffer backend. (default=no)
194 --enable-tslib-input=[yes/no]
195 Enable the TSLib input backend. (default=no) [EXPERIMENTAL]
197 --enable-evdev-input=[yes/no]
198 Enable the evdev input backend. (default=no) [EXPERIMENTAL]
200 See also the INSTALL file generated by autotools for further information.
203 -------------------------------------------------------------------------------
205 Clutter uses the common "Linux kernel" versioning system, where
206 even-numbered minor versions are stable and odd-numbered minor
207 versions are development snapshots.
209 Different major versions break both API and ABI but are parallel
210 installable. The same major version with differing minor version is
211 expected to be ABI compatible with other minor versions; differing
212 micro versions are meant just for bug fixing. On odd minor versions
213 the newly added API might still change.
215 The micro version indicates the origin of the release: even micro
216 numbers are only used for released archives; odd micro numbers are
217 only used on the Git repository.
220 -------------------------------------------------------------------------------
222 If you want to hack on and improve Clutter check the HACKING file for
223 general implementation guidelines, and the HACKING.backends for
224 backend-specific implementation issues.
226 The CODING_STYLE file contains the rules for writing code conformant to the
227 style guidelines used throughout Clutter. Remember: the coding style is
228 mandatory; patches not conforming to it will be rejected by default.
231 -------------------------------------------------------------------------------
233 Bugs should be reported to the Clutter Bugzilla at:
235 http://bugzilla.gnome.org/enter_bug.cgi?product=clutter
237 You will need a Bugzilla account.
239 In the report you should include:
241 • what system you're running Clutter on;
242 • which version of Clutter you are using;
243 • which version of GLib and OpenGL (or OpenGL ES) you are using;
244 • which video card and which drivers you are using, including output of
245 glxinfo and xdpyinfo (if applicable);
246 • how to reproduce the bug.
248 If you cannot reproduce the bug with one of the tests that come with Clutter
249 source code, you should include a small test case displaying the bad
252 If the bug exposes a crash, the exact text printed out and a stack trace
253 obtained using gdb are greatly appreciated.
256 -------------------------------------------------------------------------------
258 Patches should be submitted using Bugzilla. Patches fixing a bug should be
259 attached to the bug report; patches for new features or for fixing bugs not
260 yet reported should be attached to a newly opened bug.
262 Patches should always be in the unified diff format, using:
264 diff -Nuarp clutter.source clutter.patched > clutter-patch.diff
266 If diffing against the Git repository, you should use:
268 git diff > clutter-patch.diff
270 Or, better: commit locally and use `git format-patch` to generate a patch
271 containing authorship details, so that members of the Clutter development
272 team can credit your contribution properly.
274 Another useful tool for interacting with Git and Bugzilla is git-bz(1):
276 http://git.fishsoup.net/man/git-bz.html
278 Which is available here:
280 http://git.fishsoup.net/cgit/git-bz/
283 -------------------------------------------------------------------------------
285 Relevant information for developers with existing Clutter applications
286 wanting to port to newer releases (see NEWS for general information on new
289 Release Notes for Clutter 1.10
290 -------------------------------------------------------------------------------
292 • ClutterActor now implements ClutterContainer, and takes over the entire API
293 for modifying the scene graph; this means that every actor can have children
294 and it's not necessary any more to implement the ClutterContainer interface.
295 ClutterActor provides new API to replace clutter_actor_set_parent() and
296 clutter_actor_unparent(), as well as a default implementation of every
297 Container virtual function. Existing actors overriding ClutterContainer and
298 providing an alternate implementation will continue to work, even though it
299 is strongly encouraged to port to the new API.
301 • The ClutterActor::destroy signal is going to be emitted at the beginning
302 of the dispose sequence of a ClutterActor, instead of the end. This allows
303 to access the state of the actor being destroyed, instead of just being
304 able to use its pointer. This may expose bugs in code that does not check
305 for NULL actor pointers.
307 • The long since broken depth cueing support in ClutterStage has been
308 deprecated; the fixed pipeline fog API has been pretty much useless
309 since the switch to colors and textures with premultiplied alpha
310 channels. Setting ClutterStage:use-fog to TRUE has no visible results,
311 and querying the :use-fog and :fog properties will always yield the
314 • ClutterDeformEffect switched from using CoglVertexBuffer to using the
315 CoglPrimitive API internally, to improve performance and use non-deprecated
316 Cogl API. CoglPrimitive converts COGL_WRAP_MODE_AUTOMATIC to
317 COGL_WRAP_MODE_CLAMP_TO_EDGE, unlike CoglVertexBuffer which converts it to
318 COGL_WRAP_MODE_REPEAT. This prevents artifacts when sampling texture
319 coordinates outside the [ 0, 1 ] range. This change may cause the back
320 texture to not be painted if its coordinates go outside the allowed range,
321 for instance when using a custom transformation matrix on the back material
322 used by the ClutterDeformEffect.
324 • The "default stage" has been deprecated; since the 1.0 release, the default
325 stage creation was deferred to the call to clutter_stage_get_default(), and
326 the preferred way for getting a ClutterStage was calling clutter_stage_new()
327 instead. On platforms that do not support multiple stages, attempting to
328 create more than one stage will lead to an error, and Clutter will abort.
330 • Clutter can support multiple backends in the same shared library. Only one
331 windowing or input backend can be used at run time. As a result of this
332 change, the shared library name used by Clutter has changed from:
334 libclutter-<flavour>-<API version>.so
338 libclutter-<API version>.so
340 The pkg-config file has been updated accordingly. Until the next major API
341 break, Clutter will ship compatibility links for all the previous "flavours"
342 that were available in versions < 1.10; this allows applications dynamically
343 linking against Clutter, or using dlopen(), to keep working. For libraries
344 and applications dynamically linking against Clutter, though, it is still
345 recommended to recompile to make sure that the most recent version is being
346 used. Language bindings using GObject Introspection will automatically use
347 the new shared library without requiring any change.
349 • The windowing system backend for the CE3100 and CE4100 platforms using the
350 libgdl library is now implemented as a separate backend instance, instead
351 of being a sub-flavour of the EGL native framebuffer backend. This change
352 introduces a new header file, under $includedir/clutter-1.0/clutter/cex100,
353 which should be included to access the CEx100-specific API. The API and
354 ABI of the platform API has not been changed, though it should still be
355 considered experimental.
357 • As of 1.10 it is not necessary any more to call clutter_threads_init() to
358 initialize threading support in Clutter; after the changes in GLib 2.32,
359 threading support in Clutter is always enabled. The rules on how to use
360 Clutter from multiple threads haven't changed.
362 • Deprecated API is now marked using the CLUTTER_DEPRECATED and the
363 CLUTTER_DEPRECATED_FOR annotations; these two annotations will result in
364 compiler warnings when attempting to use the deprecated API. It is possible
365 to disable deprecation warnings for Clutter by defining the
366 CLUTTER_DISABLE_DEPRECATION_WARNINGS symbol when compiling. The previous
367 deprecation symbol, CLUTTER_DISABLE_DEPRECATED, is only used for macros.
369 • Deprecated functionality has been moved to separate header files, installed
370 under the $includedir/clutter-1.0/clutter/deprecated directory. These files
371 are still included by default by clutter/clutter.h.
373 Release Notes for Clutter 1.8
374 -------------------------------------------------------------------------------
376 • Cogl has been split out of tree. Clutter depends on Cogl, so users should
377 not notice anything. Developers using pkg-config will gain an extra Cogl
380 • The clutter_actor_get_gid() and clutter_get_actor_by_gid() functions have
381 been deprecated. They should not have been public in the first place.
383 • ClutterShader and its relative API have been deprecated. ClutterShaderEffect
384 and the effect API is the proper way to use GLSL shaders with ClutterActors.
385 It is possible to instantiate a ClutterShaderEffect directly.
387 • ClutterText's paint volume has been implemented using the ink rectangle of
388 the PangoLayout used to paint, to allow culling to work properly even in
389 the case of glyphs spilling outside the logical rectangle.
391 • Non fully opaque children of a non fully opaque actor will be composited
392 in an offscreen framebuffer object to preserve the correct overall opacity.
393 This changes the way non fully opaque actors are drawn, and might cause
394 some code relying on the old, unspecified behaviour to produce different
397 • ClutterBoxLayout layout algorithm has been changed to map the more mature
398 and more stable GtkBox one.
400 • The ClutterText:editable property was incorrectly defined in the GParamSpec
401 as being TRUE by default, but it was initialized to FALSE. To avoid breaking
402 existing code, the default value inside the GParamSpec (and inside the
403 documentation) has been changed to FALSE as well.
405 • The preferred way to draw inside a ClutterCairoTexture is connecting to
406 its ::draw signal, and calling the invalidate() method. The old pattern
407 of creating the Cairo context using the create() method is deprecated but
408 still working as intended.
410 • ClutterScore has been deprecated; the preferred way to chain up multiple
411 animations is to use the ClutterAnimator or ClutterState classes.
413 Release Notes for Clutter 1.6
414 -------------------------------------------------------------------------------
416 • The internal copy of JSON-GLib has been removed: Clutter now strictly
417 depends on the installed copy of this library. The --with-json configure
418 switch has been removed.
420 • The ClutterBehaviour class and its sub-classes have been deprecated; the
421 Clutter API reference contains a migration guide to port code based on
422 behaviours to the implicit animations framework.
424 • The ClutterTimeoutPool and clutter_frame_source_* API have been deprecated;
425 both API are not integrated in the Clutter main loop, and are not used
426 internally any longer, so they are of relative use.
428 • It it not necessary any more to provide implementations for the
429 ClutterActor::map() and ClutterActor::unmap() virtual functions, even
430 for composite actors not implementing the ClutterContainer interface.
432 • ClutterTimeline now guarantees that the ::new-frame signal will be
433 emitted at the beginning of the timeline, as well as guaranteeing that
434 the ::completed signal will be emitted at the end of the timeline.
436 • ClutterActor will check for the enabled property of ClutterActorMeta
437 instances (actions, constraints and effects), and will not invoke
438 ClutterActorMeta functions on disabled instances. This removes the
439 requirement for checking the property inside the ClutterActorMeta
442 • ClutterActorBox, ClutterGeometry and ClutterVertex install a progress
443 function for ClutterInterval, allowing the interpolation of properties
444 using them as storage types.
446 • ClutterColor's clutter_color_from_string() function accepts CSS3 color
449 • The previously unused "axes" field in the ClutterButtonEvent,
450 ClutterScrollEvent and ClutterMotionEvent structures is now used on
451 the X11-based backends with XInput support.
453 • ClutterListModel will honour the filter function when calling
454 clutter_model_get_iter_at_row().
456 • ClutterClickAction does not use a pointer grab any longer, and uses
457 a capture on the stage instead.
459 • On all platforms which allow it, ClutterStage will ask the windowing
460 system for an explicit key focus when showing the stage window. This
461 can be disabled using clutter_stage_set_accept_focus().
463 Release Notes for Cogl 1.6
464 -------------------------------------------------------------------------------
466 • Cogl may internally optimise cogl_read_pixels when only a single
467 pixel is drawn and the entire scene is comprised of solid colour
468 rectangles. Instead of actually rendering the rectangles it will
469 compute the single pixel value in software. This effectively means
470 that Clutter can do software picking without any API changes.
472 • Internally Cogl now has a GLSL backend as well as the ARBfp and
473 fixed function backends. By default, this backend has the lowest
474 priority but it can be explicitly enabled by setting the
475 COGL_DEBUG environment variable, e.g.:
477 export COGL_DEBUG=disable-fixed,disable-arbfp
479 for builds of Clutter with debug support enabled.
481 • Cogl will internally now cache generated ARBfp programs so that it
482 should be able to reuse a previous program even if it was generated
483 for an unrelated CoglMaterial. This makes using one-shot materials
484 less expensive than before although it is still not recommended.
486 Release Notes for Clutter 1.4
487 -------------------------------------------------------------------------------
489 • ClutterLayoutManager sub-classes overriding the set_container() virtual
490 function should chain up to the parent class's implementation.
492 • The ClutterTexture:filename property is now readable, as well as writable;
493 this allows querying the Texture for the filename storing the image data.
494 The value will be unset when using the set_from_*_data() family of
497 • If both the :sync-size and the :keep-aspect-ratio properties of a
498 ClutterTexture are set to TRUE, then the texture actor will update its
499 ClutterActor:request-mode property depending on the orientation of the
500 image data - height-for-width for landscape, and width-for-height for
501 portrait. Square image data will default to height-for-width, like all
502 actors. You can still explicitly override the :request-mode value, or
503 you can unset the :sync-size property to control the size yourself.
505 • All the key symbol macros have been renamed from CLUTTER_* to
506 CLUTTER_KEY_*. The old names are still available inside the
507 clutter-keysyms-compat.h header, which is included by clutter-keysyms.h
508 unless CLUTTER_DISABLE_DEPRECATED is defined.
510 • The internal copy of json-glib is now deprecated. Building Clutter will
511 default to the system copy and requires an explicit --with-json=internal
512 to override the check.
514 Release Notes for Clutter 1.2
515 -------------------------------------------------------------------------------
517 * ClutterStageManager is now publicly available and documented API.
519 * Clutter now depends on the system copy of JSON-GLib, and will fall
520 back to the internal copy only if JSON-GLib is not installed.
522 * ClutterActor:opacity is now defined using GParamSpecUint instead of
523 GParamSpecUchar; the same interval of [ 0, 255 ] applies, and GValue
524 has internal transformation functions for converting between G_TYPE_UINT
525 and G_TYPE_UCHAR, so this change should be fully transparent to the
528 * On X11 Clutter will emulate XKB's detectable key auto-repeat; this means
529 that when holding down a key, Clutter will emit multiple CLUTTER_KEY_PRESS
530 events and a single CLUTTER_KEY_RELEASE event instead of a list of
531 CLUTTER_KEY_PRESS and CLUTTER_KEY_RELEASE pairs.
533 * On X11 and Win32 the default Stage is created when
534 clutter_stage_get_default() is called for the first time, and not as
535 part of the stage initialization.
537 Cogl API changes for Clutter 1.2
538 -------------------------------------------------------------------------------
540 * cogl_viewport is now deprecated in favour of cogl_set_viewport which
541 accepts a viewport offset.
543 * cogl_clip_push() is now deprecated and new code should use
544 cogl_clip_push_rectangle() instead. The old API wasn't consistent with other
545 Cogl APIs that specify model space rectangles using (x0,y0)(x1,y1) pairs.
547 * cogl_clip_push_window_rect() is now deprecated and new code should use
548 cogl_clip_push_window_rectangle(). The old API shouldn't have been defined
549 to take floats and the abbreviation wasn't consistent with other Cogl API.
551 * cogl_clip_stack_save() and cogl_clip_stack_restore() are deprecated, as
552 the functionality is redundant now that offscreen draw buffers own their
553 clip state and switching to/from offscreen rendering will automatically
554 save and restore the clip state.
556 * cogl_material_copy() was added. It is advised that developers use
557 this instead of cogl_material_new() when creating a material that is in some
558 way derived from another. This will allow Cogl to track material
559 ancestries/similarities and reduce the cost of GPU state changes.
561 * cogl_push_draw_buffer, cogl_set_draw_buffer and cogl_pop_draw_buffer are now
562 deprecated and new code should use the cogl_framebuffer_* API instead.
563 Code that previously did:
564 cogl_push_draw_buffer ();
565 cogl_set_draw_buffer (COGL_OFFSCREEN_BUFFER, buffer);
567 cogl_pop_draw_buffer ();
568 can now be re-written as:
569 cogl_push_framebuffer (buffer);
571 cogl_pop_framebuffer ();
573 * All cogl_<type>_ref() and cogl_<type>_unref() functions have been
574 deprecated, and superceded by cogl_handle_ref() and cogl_handle_unref()
577 * The cogl_check_extension() function has been deprecated. This function
578 was never meant to be public, since it depends on calling glGetString()
579 before its invocation. Users of this function can be replaced by the
582 gl_ext = glGetString (GL_EXTENSIONS);
583 - has_ext = cogl_check_extension (ext_name, gl_ext);
584 + has_ext = strstr (gl_ext, ext_name) != NULL ? TRUE : FALSE;
586 Release Notes for Clutter 1.0
587 -------------------------------------------------------------------------------
589 * The clutter_actor_set_shader_param() function now takes a
590 GValue, which can be set using the clutter_value_set_shader()
591 family of functions. The floating point wrapper has been
592 rename clutter_actor_set_shader_param_float() to match the newly
593 added clutter_actor_set_shader_param_int().
595 * The Pango renderer API has been exposed as public API, after
596 a full rename from PangoClutter to CoglPango, to avoid namespace
597 collisions with upstream Pango. The Pango font map, renderer and
598 glyph cache can be used by third party code and depend only on
601 * Both Clutter and COGL only allow including <clutter/clutter.h>
602 and <cogl/cogl.h> directly, respectively. This allows avoiding
603 breaking API every time a type definition is moved across
604 headers, and improves the reliability of third party code against
605 internal refactorings.
607 * COGL has an internal Color type, used to store a color definition
608 that can be efficiently used with the least amount of conversions
609 by both the GL and GLES implementations. The COGL API has been
610 changed to drop the usage of ClutterColor in favour of CoglColor.
612 * The fixed point API implementation Clutter uses internally has been
613 moved from the Clutter namespace to the COGL one.
615 * ClutterLabel and ClutterEntry have been removed from the API, as
616 both have been superceded by the ClutterText actor.
618 * ClutterCloneTexture has been removed from the API; in its place,
619 there is a generic ClutterClone actor which allows to "clone"
620 any existing actors -- even composite ones -- without using
621 frame buffer objects (FBOs).
623 * The ClutterEffectTemplate and clutter_effect_* functions have been
624 superceded by ClutterAnimation and thus removed from the public API.
626 * The ClutterBehaviourBspline has been superceded by the usage of
627 ClutterPath inside ClutterBehaviourPath, and thus removed from the
630 * ClutterColor API has received a much needed review to increase its
631 consistency. This has led to the following changes:
633 - clutter_color_parse() has been renamed to clutter_color_from_string()
634 and the order of the arguments has been changed
636 - the factor argument of clutter_color_shade() has been swapped with
637 the return location for the new color
639 - the fixed point entry points have been removed
641 - clutter_color_from_hls() and clutter_color_to_hls() do not
642 normalize the values in the [ 0, 255 ] interval but use the
643 correct HLS intervals:
649 * The ClutterFixed symbols have been completely removed: fixed-point
650 public entry points now take a CoglFixed.
652 * The -x and -u API have been removed. All the pixel-based API now
653 takes a float to allow sub-pixel precision; this is true also for
654 properties. WARNING: functions with variadic arguments (like
655 g_object_set(), g_object_get() and clutter_actor_animate()) do not
656 behave very well when dealing with integers instead of expected
657 floating point values, and vice versa. On 32bit machines it will
658 most likely lead to a crash. So:
660 g_object_set (actor, "width", 100, NULL);
662 is incorrect, and should be changed in:
664 g_object_set (actor, "width", 100.0, NULL);
666 * Composite actors that do not implement the Container interface
667 should implement the following virtual functions:
669 - void map (ClutterActor*)
670 - void unmap (ClutterActor*)
672 and chain up to the parent's implementation after calling
673 clutter_actor_map() or clutter_actor_unmap() on their children.
675 * Actors implementing the Container interface that have private
676 children that are not meant to be added/removed through the
677 Container API should implement the:
679 - void foreach_with_internals (ClutterContainer*,
685 * Actors that perform direct transformations using the COGL API inside
686 their paint() implementation should override the apply_transform()
687 virtual function instead. Implementations of the apply_transform()
688 vfunc must chain up to the implementation of the parent class.
690 * The ClutterUnit type and the CLUTTER_UNITS_* conversion macros have
691 been removed: all Actors are now using sub-pixel precision directly
692 throughout the API. The new ClutterUnits type has been added as a
693 generic opaque storage for logical distance values.
695 * Timelines are now fully time-based: all the frame-related properties
696 and methods have been removed. ClutterTimeline::new-frame will provide
697 the elapsed milliseconds since the beginning of the Timeline, instead
698 of the current frame number. The clutter_timeline_new() constructor
699 takes the duration of the timeline in milliseconds, and thus it replaces
700 the clutter_timeline_new_for_duration() variant.
702 Cogl API changes for Clutter 1.0
703 -------------------------------------------------------------------------------
705 * All drawing functions now use a source material to determine how geometry is
706 filled. The source material is set via cogl_set_source. Or the convenience
707 functions cogl_set_source_color and cogl_set_source_texture.
709 "drawing functions" include: cogl_rectangle, cogl_texture_rectangle,
710 cogl_texture_multiple_rectangles, cogl_texture_polygon (though the
711 cogl_texture_* funcs have been renamed; see below for details),
712 cogl_path_fill/stroke and cogl_vertex_buffer_draw*.
714 cogl_texture_rectangle, cogl_texture_multiple_rectangles and
715 cogl_texture_polygon no longer take a texture handle; instead the current
716 source material is referenced. The functions have also been renamed to:
717 cogl_rectangle_with_texture_coords, cogl_rectangles_with_texture_coords
718 and cogl_polygon respectively.
720 Most code that previously did:
721 cogl_texture_rectangle (tex_handle, x, y,...);
722 needs to be changed to now do:
723 cogl_set_source_texture (tex_handle);
724 cogl_rectangle_with_texture_coords (x, y,....);
726 In the less likely case where you were blending your source texture with a
728 cogl_set_source_color4ub (r,g,b,a); /* (where r,g,b,a isn't just white) */
729 cogl_texture_rectangle (tex_handle, x, y,...);
730 you will need your own material to do that:
731 material = cogl_material_new ();
732 cogl_material_set_color4ub (r,g,b,a);
733 cogl_material_set_layer (material, 0, tex_handle));
734 cogl_set_source_material (material);
736 Code that uses the texture coordinates, 0, 0, 1, 1 don't need to use
737 cogl_rectangle_with_texture_coords since these are the coordinates that
738 cogl_rectangle will use.
740 For cogl_texture_polygon; as well as dropping the texture handle, the
741 n_vertices and vertices arguments were transposed for consistency. So
742 code previously written as:
743 cogl_texture_polygon (tex_handle, 3, verts, TRUE);
744 need to be written as:
745 cogl_set_source_texture (tex_handle);
746 cogl_polygon (verts, 3, TRUE);
748 * The arguments to cogl_rectangle, cogl_path_rectangle and
749 cogl_path_round_rectangle have been changed - for consistency - from
750 x, y, width, height, to x1, y1, x2, y2.
752 * A CoglMatrix type and utility API has been added; this is currently used to
753 support describing texture matrices.
755 * cogl_alpha_func has been removed, since this is now controlled using the
756 material API via cogl_material_set_alpha_test_function ()
758 * A Cogl Vertex Buffer API has been added that allows you to efficiently
759 manage arrays of vertex attributes in buffers that may be stored on
760 the GPU. These allow you to avoid the costs of repeatedy validating
761 vertex data and mapping it into the GPU.
763 * cogl_scale now supports scaling on the z axis
765 * cogl_clip_set* and cogl_clip_unset have been renamed to cogl_clip_push and
766 cogl_clip_pop respectively so they self document their stacking semantics.
768 * cogl_paint_init was renamed to cogl_clear and no longer disables lighting and
769 fogging. cogl_clear also now takes a mask of the auxiliary buffers you want
770 to clear so you can avoid redundant clears of buffers you aren't using.
772 * cogl_fog_set was renamed to cogl_set_fog and it now takes a mode argument
773 giving control over the fogging blend factor equation, so that the
774 density argument isn't just ignored. A cogl_disable_fog function was
777 * cogl_get_*_matrix were changed to use the CoglMatrix type instead of
778 GLfloat m[16] arrays.
780 * cogl_offscreen_blit_region, cogl_offscreen_blit were removed since they were
781 only implemnted for GL, not GLES, and it was assumed no one was using them.
783 * cogl_offscreen_new_multisample was removed since it only ever returned
784 COGL_INVALID_HANDLE so it wasn't usefull.
786 * The COGL_MASK_BUFFER type was removed, since there should be nicer ways of
787 exposing color mask if anyone wants it later. It was assumed that no one was
788 using this currently.
790 * COGLenum, COGLint and COGLuint which were simply typedefs for
791 GL{enum,int,uint} have been removed from the API and replaced with
792 specialised enum typedefs, int and unsigned int. These were causing
793 problems for generating bindings and also considered poor style.
795 * The cogl texture filter defines CGL_NEAREST and CGL_LINEAR etc are now
796 replaced by a namespaced typedef 'CoglTextureFilter' so they should be
797 replaced with COGL_TEXTURE_FILTER_NEAREST and COGL_TEXTURE_FILTER_LINEAR etc.
799 * The shader type defines CGL_VERTEX_SHADER and CGL_FRAGMENT_SHADER are handled
800 by a CoglShaderType typedef and should be replaced with
801 COGL_SHADER_TYPE_VERTEX and COGL_SHADER_TYPE_FRAGMENT.
803 * cogl_shader_get_parameteriv has been replaced by cogl_shader_get_type and
804 cogl_shader_is_compiled. More getters can be added later if desired.
806 * cogl_enable_depth_test has been renamed to cogl_set_depth_test_enabled and
807 a corresponding cogl_get_depth_test_enabled function has been added.
809 Release Notes for Clutter 0.8
810 -------------------------------------------------------------------------------
812 * The COGL GL wrapper API has been completely overhauled and now
813 contains many new features including new greatly improved texture
814 abstractions (slicing, mipmapping, deformations etc, greatly
815 simplifying ClutterTexture), image loading and abstraction, path
816 based primitive drawing, clipping, and improved FBO and shader
817 support. It is now also fully documented.
819 * GL Texture Rectangle ext is no longer used, the regular 2D NPOTS
820 extension is preffered instead but not required.
822 * Clutter now has basic suppport for multiple input devices assuming
823 the backend supports it (currently X11 based via XInput and Fruity
824 backends). New API supporting this includes
825 clutter_event_get_device_id, clutter_get_input_device_for_id,
826 clutter_grab_pointer_for_device & clutter_ungrab_pointer_for_device.
828 XInput support needs to be explicitly enabled at runtime by calling
829 clutter_x11_enable_xinput () before clutter_init. clutter_x11_has_xinput ()
830 can then be called after to check if XInput extension present and use-able.
832 * The functions that return the transformed position of an actor have
833 been renamed to be more explicit about it:
835 clutter_actor_get_abs_position - clutter_actor_get_transformed_position
836 clutter_actor_get_abs_size - clutter_actor_get_transformed_size
838 Their behaviour has not been changed.
840 * To increase portability, Clutter does not strictly depend on
841 GdkPixbuf anymore; this means that you will have to include
842 <gdk-pixbuf/gdk-pixbuf.h> yourself if you are operating with
843 GdkPixbuf objects and not including that header. The GdkPixbuf-based
844 API has been removed from Clutter core:
846 clutter_texture_new_from_pixbuf
847 clutter_texture_set_pixbuf
848 clutter_texture_get_pixbuf
850 are all deprecated functions. It is still possible to load a GdkPixbuf
851 into a ClutterTexture with this sample code:
853 clutter_texture_set_from_rgb_data (texture,
854 gdk_pixbuf_get_pixels (pixbuf),
855 gdk_pixbuf_get_has_alpha (pixbuf),
856 gdk_pixbuf_get_width (pixbuf),
857 gdk_pixbuf_get_height (pixbuf),
858 gdk_pixbuf_get_rowstride (pixbuf),
859 gdk_pixbuf_get_has_alpha (pixbuf) ? 4
864 ClutterTexture also now has a new filename property and
865 clutter_texture_new_from_file which is intended as an alternate to
866 common previous GdkPixbuf primary usage (i.e loading images from
869 To read texture data back into a pixbuf or system memory use a combination
870 of clutter_texture_get_cogl_texture & cogl_texture_get_data.
872 The clutter-gtk integration library has API for using GdkPixbuf with
873 ClutterTextures (among others).
875 ClutterTexture now supports a keep-aspect property which is set to FALSE
878 * clutter_texture_from_actor will now reparent source actors if they
879 are not parented. This behaviour may change in future releases.
880 There are known not yet fixed issues with source actors that set
881 depth or use clipping.
883 * The size negotiation API has been completely changed in order to allow
884 the creation of non-fixed layout managers. These functions have been
887 clutter_actor_request_coords()
888 clutter_actor_query_coords()
890 from the ClutterActor API, as well as their virtual functions inside
891 the ClutterActorClass. The size of an actor is now split into two
892 different concepts: the preferred size (width and height
893 separatedly) and the size that has been allocated by the container
894 to which that actor belongs. Clutter still defaults to the fixed
895 layout management (i.e ClutterGroup) of the actors, but supports
896 fluid layout managers written using the new API.
898 Composite actors (actors with 'private' children not implementing the
899 container interface) now need to implement an allocate method here pass
900 an allocation to any composite children.
902 * Clutter now depends on PangoCairo for the font rendering. The PangoClutter
903 API is still considered semi-private and no guarantees are made on its
906 * ClutterShader API has been slightly changed: the ClutterStage:bound
907 property, clutter_shader_bind() and clutter_shader_is_bound() have
908 been renamed to :compiled, clutter_shader_compile() and
909 clutter_shader_is_compiled(), respectively. The previously semi-private
910 clutter_shader_release_all() function is now not exported anymore.
912 * ClutterStage is not an abstract type anymore: it can be instantiated
913 using clutter_stage_new() and it can be properly subclassed. If the
914 backend supports multiple stages, every stage will be a new window,
915 whose lifetime will have to be managed by the developer. Clutter will
916 still create the default stage, and guarantees that every call to
917 clutter_stage_get_default() will return exactly the same pointer.
919 * Actors now have a new 'show-on-set-parent' property set to TRUE by
920 default. With this property set to TRUE, actors will automatically
921 have clutter_actor_show() called on them when a parent is set (i.e
922 added to a container).
924 * Clutter now features support for multiple stages assuming supported
925 by the backend. See test-multistage.c for example of usage. This
926 does not change the automatic creation of the default stage.
927 A single GL context is used across all stages meaning GL resources
930 * There is now an experimental native iPod Touch/iPhone UIKit backend
933 * There is now an experimental native Win32 WGL backend.
935 * COGL (and therefor Clutter) now optionally features initial support for
936 OpenGL ES 2.0. It features support for shaders.
938 * Some more focused timeline unit tests have been added and some tweaks to
939 timeline semantics were made; E.g. For a 10 frame timeline here are some
940 points about the semantics:
941 - When you create a timeline it starts with current_frame_num == 0
942 - After starting a timeline, the first timeout is for current_frame_num == 1
943 (Notably it isn't 0 since there is a delay before the first timeout signals
944 so re-asserting the starting frame (0) wouldn't make sense.)
945 - For a non looping timeline the last timeout would be for
946 current_frame_num == 10
947 - For a looping timeline the timeout for current_frame_num == 10 would be
948 followed by a timeout for current_frame_num == 1 and frame 0 is considered
950 - Asking for a timeline of N frames might better be described as asking for
951 a timeline of _length_ N.
953 * The behaviour of clutter_actor_get_opacity() has been slightly changed;
954 instead of returning the composited opacity of the entire parents chain
955 of an actor, clutter_actor_get_opacity() does what you mean, and returns
956 the opacity set with clutter_actor_set_opacity(). The composited
957 opacity value is now returned by clutter_actor_get_paint_opacity().
959 * Until 0.6, clutter_label_get_color() would have returned a ClutterColor
960 with the alpha component equal to the composited opacity of the label.
961 Now, clutter_label_get_color() returns a copy of the exact color set
962 with clutter_label_set_color().
964 * The ClutterEntry actor will automatically handle key events inside
965 a key-press-event handler. This deprecates the usage of
966 clutter_entry_handle_key_event() to update the contents of the
967 entry using the ClutterKeyEvent.
969 * The Clutter X11 and GLX backends feature support for wrapping external
970 X Drawables (such as windows as pixmaps) via the 'texture_from_pixmap' GLX
971 extension if available and fallback to slower XGetImage copies if not.
973 * ClutterContainer can have per child custom properties via ClutterChildMeta.
975 Release Notes for Clutter 0.6
976 -------------------------------------------------------------------------------
978 * Now that every actor has events, the class signal handlers have been
979 removed from ClutterStageClass and moved into ClutterActorClass.
981 * The CLUTTER_2BUTTON_PRESS and CLUTTER_3BUTTON_PRESS event types have been
982 removed in favour of the ClutterButtonEvent:click_count counter
984 * X11 related called for glx and eglx backends are now shared and moved into
985 a clutter_x11 prefix.
987 * Scaling with gravity functionality was replaced by more generic and
988 powerful anchor point.
990 * The ClutterLayout interface, the ClutterBox and its implementations have
991 been moved outside Clutter core.
993 * The Effects API has been simplified, and it only requires the final value
994 of the effect instead of both the start and end value.
996 * The per-axis rotation API has been deprecated in favour of a single
997 pair of accessors, clutter_actor_set_rotation() and
998 clutter_actor_get_rotation().
1000 * Every actor sub-class that is overriding the ClutterActor::request_coords()
1001 virtual function *must* chain up to the parent's implementation in order
1002 to store the bounding box inside the ClutterActor private data.
1004 * It is now impossible to call clutter_actor_destroy() on the stage. Backends
1005 will have to unset the CLUTTER_ACTOR_IS_TOPLEVEL private flag to actually
1008 * The default value of the ClutterLabel:wrap property has been changed from
1011 * All the behaviours properties have been renamed to match the $PROPERTY-start
1012 and $PROPERTY-end convention.
1014 * The clutter_group_add() function has been "undeprecated" and reimplemented
1015 as a commodity macro; a clutter_stage_add() commodity macro has also been
1016 added. Both macros just safely wrap clutter_container_add_actor().
1018 * The ClutterContainer::find_child_by_id() virtual function has been removed;
1019 Clutter keeps track of every actor, so there's no need to recurse into
1022 * The unused ClutterActor::set_depth() and ClutterActor::get_depth() virtual
1023 functions have been removed.
1025 * It is now possible to roundtrip the string created by
1026 clutter_color_to_string() to clutter_color_parse().
1028 * The amount of motion events is now being throttled using the default frame
1029 rate setting as the base value to compute the default and maximum frequency
1030 of motion events to be delivered to every actor.
1032 * ClutterAngle usage has been removed from the public API: it is an internal
1033 optimization, which can be used for faster angle computations; users of
1034 ClutterAngle now take a fixed point number in form of a ClutterFixed.
1036 * ClutterGravity usage when scaling has been superceded by the anchor point.
1038 * The precision of the clutter_sqrti() algorithm has been improved for small
1041 * ClutterBehaviourScale constructor, scale properties and accessors have
1042 been changed to accomodate the scaling factors on both the X and Y axis,
1043 matching the clutter_actor_set_scale() function. This also changed the
1044 clutter_effect_scale() function, which now accepts the final scale
1045 factor on both the X and Y axis. The gravity property has also been
1046 removed, as it behaved incorrectly with regards to the anchor point. When
1047 scaling an actor using a BehaviourScale, the anchor point should be set
1048 before applying the behaviour (remember to adjust the positioning as
1049 well by factoring in the anchor point).
1051 * The clutter_do_event() is now public; it can be used to feed an event to
1052 Clutter and let it generate the capture-bubble signal emissions; it should
1053 not be used by applications.
1055 * In the X11-based backends, the DestroyNotify event is not propagated to
1056 Clutter core if the stage is using a foreign window.
1058 * To avoid method name collisions between ClutterActor and ClutterEntry
1059 in high-level languages, the clutter_entry_set_position() and
1060 clutter_entry_get_position() functions have been renamed to
1061 clutter_entry_set_cursor_position() and clutter_entry_get_cursor_position()
1064 Release Notes for Clutter 0.4.0
1065 -------------------------------------------------------------------------------
1067 * clutter_actor_show_all does not recurse for groups at least (this is to
1068 match the original group_show_all behaviour). This is like 0.3 but was
1071 * ClutterBox API has changed: clutter_box_pack_start() and
1072 clutter_box_pack_end() have been removed in favour of the clutter_box_pack()
1075 * Both clutter_threads_enter() and clutter_threads_leave() have been
1076 removed from the API, as they just created confusion and the wrong
1077 idea that Clutter is either thread-safe or thread-aware. Full
1078 thread-awareness is arriving in the next revision (see bug #429).
1080 * The ClutterBehaviourRotate and ClutterBehaviourEllsipse APIs have been
1083 Release Notes for Clutter 0.3.1
1084 -------------------------------------------------------------------------------
1086 * clutter_actor_apply_transform_to_point() parameters changed to use
1089 * New 'Native API' backend expects EGL implementation to provide a
1090 CreateNativeWindow() API call.
1092 * Exisiting X11 based egl backend public API calls now prefixed eglx.
1094 Release Notes for Clutter 0.3
1095 -------------------------------------------------------------------------------
1097 * ClutterTexture changes:
1098 + clutter_texture_set_pixbuf() now takes a GError paremeter.
1099 + clutter_texture_upload_data has been split into two new and
1100 more functional versions; clutter_texture_set_from_rgb_data(),
1101 clutter_texture_set_from_yuv_data().
1103 * The GLX specific API has been moved to the GLX backend code and
1104 it's now under the ClutterGlx namespace.
1106 * The priority of the various users of the GLib main loop has been
1107 reviewed and changed were necessary. Every paint is queued with a
1108 priority of G_PRIORITY_DEFAULT + 10; timelines are allocated with
1109 a G_PRIORITY_DEFAULT + 30 priority; events are processed with a
1110 G_PRIORITY_DEFAULT priority. This ensures that events are processed
1111 before the paints take place.
1113 * The ClutterActor::allocate_coords() has been renamed to
1114 ClutterActor::query_coords(), in order to clarify its usage.
1116 * Actors overriding ClutterActor::request_coords() and
1117 ClutterActor::query_coords() must convert sizes obtained from the
1118 public API from pixels to ClutterUnits, using the conversion
1119 macros found in clutter-units.h. The conversion will be necessary
1120 until the public API will switch over to returning the generic
1123 * Users of Intel video cards should find that disabling sync-to-vblank
1124 is no longer necessary. In case Clutter applications take really
1125 long times for redrawing and appear stuck and unresponsive, the
1126 sync-to-vblank feature might still be the culprit; in that case, use
1127 "export CLUTTER_VBLANK=none" to disable it and file a bug reporting the
1128 video card model, the driver version and the X server version.
1130 * ClutterTimeline objects now share the same timeout pool (see the
1131 ClutterTimeoutPool API). This might cause problems with heavily
1132 threaded libraries without integration with the GLib main loop.
1133 If an application experiences bad behaviours during animations
1134 use "export CLUTTER_TIMELINE=no-pool" to disable the timeout pool.
1136 * clutter_color_parse() now handles color definitions with alpha. Alpha
1137 will default to fully Opaque rather than fully transparent if not specified.
1139 * The Clutter examples/ directory has been removed and replaced with a
1142 * The ClutterEvent API has been changed, and specific functions have been
1143 removed in favour of event-agnostic ones.
1145 * The ClutterStage::input-event signal has been removed. All the events now
1146 emit the ClutterStage::event and ClutterStage::event-after signals, for
1147 generic event handling.
1149 * Runtime options now dependant on backend.
1151 * ClutterGroup API to add, remove and list children has been deprecated in
1152 favour of ClutterContainer API. The ClutterGroup::add and
1153 ClutterGroup::remove signals have been deprecated:
1154 ClutterContainer::actor-added and ClutterContainer::actor-removed should