Release Cogl 1.9.6 (snapshot)

Good news, everyone!

A new Cogl snapshot (1.9.6) is now available:

These are the changes since Cogl 1.9.4:

  » New conformance tests or tests ported from Clutter:
  » New public experimental functions:
  » Added cogl_kms_renderer_get_kms_fd to get the KMS file descriptor.
  » Bug fixed in the KMS support where it would crash on cleanup if it
    couldn't save the CRTC state.
  » Bug fixed in the Wayland compositor support where it would leak
    EGLImages when creating a texture from a buffer
  » The swap_buffer callback in GLX is now delayed until
    cogl_poll_dispatch is called so that apps can handle it more
  » Fixes for bugs with pipelines that are trying to use a layer with
    a NULL texture.
  » New cogl_framebuffer_* API for drawing directly to the framebuffer
    without having to push the framebuffer. Ideally we want to move
    towards this style of API in future with no global stacks.
  » Most of the _EXP suffixes have been removed from the experimental
    API symbols in the hope that the gtk-doc unstable annotation will
    be enough to distinguish these.
  » Add a COGL_DEBUG=winsys option
  » CoglBuffer and CoglPrimitive now take an explicit CoglContext
    argument in their constructor. We want to move towards getting rid
    of the global context.
  » Updates to the MSVC build support.
  » Add cogl_pipeline_set_layer_null_texture(). This can be used for
    base pipelines instead of having to create a dummy texture.
  » Fix some bugs where Cogl was assuming there is a direct mapping
    between the pipeline layer number and the GL texture unit number.
  » In snippets, there are now always builtin sampler uniforms for
    every layer of the pipeline. This makes it easier to write GLSL
    that samples arbitrary units.
  » The texture lookup snippet hook now gets passed the sampler for
    the unit. The snippet can use this to sample the texture multiple
  » Some public constants for CoglPixelFormat have been removed
  » 30-bit pixel formats added.
  » COGL_DEBUG=wireframes now correctly renders primitives using
    vertex shader snippets.
  » cogl_framebuffer_swap_buffers and friends have been renamed to
  » If the experimental 2.0 API is requested, as far as possible the
    headers for the 1.0 API are no longer included. Define
    COGL_ENABLE_EXPERIMENTAL_API instead if you want to mix both APIs.

  • List of bugs fixed since Cogl 1.9.4

    #660188 - Color corruption with software rendering at 30-bit color depth
    #668385 - Missing G_END_DECLS in cogl-poll.h
    #668856 - Do not look for GLES2-only GLSL prototypes on GL
    #668913 - The journal for an offscreen doesn't get flushed when
              cogl_texture_get_data is called
    #669368 - Reading back texture fails with ‘Invalid operation’ + wrong image
    #669785 - Build fixes for COGL master (1.9.x)

  • Note the following conformance tests are currently failing with
    the GLES2 driver but they were also failing in 1.9.4:
    test_cogl_depth_test, test_cogl_sub_texture, test_cogl_texture_3d

Many thanks to:

  Robert Bragg
  Chun-wei Fan
  Damien Leone
  Emmanuele Bassi
  Jasper St. Pierre
  Chao-Hsiung Liao
  Gheyret Kenji
  Ihar Hrachyshka
  Kasia Bondarava
  Kenneth Nielsen
  Kjartan Maraas
  Ryan Lortie


Tarballs can be downloaded from:

SHA256 Checksum:


Additionally, a git clone of the source tree:
  git clone git://

will include a signed 1.9.6 tag which points to a commit named:

which can be verified with:
  git verify-tag 1.9.6

and can be checked out with a command such as:
  git checkout -b build 1.9.6


Cogl is a small open source library for using 3D graphics hardware for
rendering. The API departs from the flat state machine style of OpenGL and is
designed to make it easy to write orthogonal components that can render without
stepping on each others toes.

As well as aiming for a nice API, we think having a single library as opposed
to an API specification like OpenGL has a few advantages too; like being
able to paper over the inconsistencies/bugs of different OpenGL
implementations in a centralized place, not to mention the myriad of OpenGL
extensions. It also means we are in a better position to provide utility
APIs that help software developers since they only need to be implemented
once and there is no risk of inconsistency between implementations.

Having other backends, besides OpenGL, such as drm, Gallium or D3D are
options we are interested in for the future.


Cogl currently only requires:

  • GLib ≥ 2.28.0
  • OpenGL ≥ 1.3 (or 1.2 + multitexturing), or OpenGL ES 2.0 (or 1.1)
  • GLX, AGL, WGL or an EGL implementation

Cogl also has optional dependencies:

  • GDK-Pixbuf ≥ 2.0
     - for image loading
  • Cairo ≥ 1.10
     - for debugging texture atlasing (debug builds only)

The optional Cogl Pango library requires:
  • Cairo ≥ 1.10
  • PangoCairo ≥ 1.20

On X11, Cogl depends on the following extensions

  • XComposite ≥ 0.4
  • XDamage
  • XExt
  • XFixes ≥ 3

When running with OpenGL, Cogl requires at least version 1.3
or 1.2 with the multitexturing extension. However to build Cogl
you will need the latest GL headers which can be obtained from:

If you are building the API reference you will also need:

  • GTK-Doc ≥ 1.13

If you are building the additional documentation you will also need:

  • xsltproc
  • jw (optional, for generating PDFs)

If you are building the Introspection data you will also need:

  • GObject-Introspection ≥ 0.9.5

GObject-Introspection is available from:


If you want support for profiling Cogl you will also need:

  • UProf ≥ 0.3

UProf is available from:



The 1.x API is documented here:
The experimental 2.0 API is documented here:

  - This is a development snapshot release so there are not API or ABI stability
    guarantees at this point for new APIs since the last stable release.

  - This Cogl release exports a 1.x API (For third-party Clutter
    developers to write custom actors) and an experimental 2.0 API which
    allows standalone application development.

  - Internally Clutter depends on the Cogl 2.0 experimental API so we maintain
    runtime compatibility between the 1.x API and experimental 2.0 APIs, which
    means developers can mix-and-match their use of the APIs in the same
    process.  API selection is done per-file by including a line like: '#define
    COGL_ENABLE_EXPERIMENTAL_2_0_API' before including cogl.h or clutter.h.

  - We recommend using the 2.0 API if you don't mind updating your code once in
    a while as this API evolves and stabilizes. We promise not to break the 2.0
    API during a 1.x stable cycle and hope that will encourage people to
    experiment with it and give critical feedback! For example after releasing
    1.8, the 2.0 API will be stable for 1.8.1, 1.8.2, 1.8.3 etc, but may update
    for 1.9/1.10.

  - Because we export the 1.x and 2.0 APIs from one the library
    versioning, and thus ABI, can only be considered as stable as our 2.0 API -
    i.e. during a stable release 1.x cycle.

  - Please report bugs using the Cogl Bugzilla product, at:

- Neil

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