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Read-only mirror of https://gitlab.gnome.org/GNOME/mutter
882ff5612b
This adds a very minimal and fast allocator for chunks of memory of a predetermined size. This has some similarities to the glib slice allocator although notably it is not thread safe and instead of internally tracking multiple magazines for various sized allocations the api lets you explicitly allocate a single magazine for a single specific size and a pointer to the magazine is passed explicitly to the allocate and free functions. This allocator builds on the CoglMemoryStack allocator as an underlying heap allocator and just never rewinds the stack. This means the heap is effectively a grow only linked list of malloc()'d blocks of memory. A CoglMagazine tracks a singly linked list of chunks of a predetermined size and _cogl_magazine_chunk_alloc() simply unlinks and returns the head of the list. If the list is empty it falls back to allocating from the underlying stack. _cogl_magazine_chunk_free() links the chunk back into the singly linked list for re-use. The chunk size passed to _cogl_magazine_new() is automatically rounded to a multiple of 8 bytes to ensure that all stack allocations end up aligned to 8 bytes. This also ensures that when a chunk is freed then it will be large enough to store a pointer to the next free chunk as part of a singly linked list. Reviewed-by: Neil Roberts <neil@linux.intel.com> (cherry picked from commit 17799c2f109a008d6cf767f501b81aa9b32bbda8) |
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build | ||
cogl | ||
cogl-pango | ||
doc | ||
examples | ||
po | ||
tests | ||
.gitignore | ||
.vimrc | ||
autogen.sh | ||
ChangeLog | ||
cogl.doap | ||
config-custom.h | ||
config.h.win32.in | ||
configure.ac | ||
COPYING | ||
Makefile.am | ||
NEWS | ||
README.in |
README for Cogl @COGL_1_VERSION@ =============================================================================== Note: This file is delimited with -- markers so it is possible to split sections out for other purposes, such as for release notes. -- DESCRIPTION ------------------------------------------------------------------------------- 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. -- REQUIREMENTS ------------------------------------------------------------------------------- Cogl currently only requires: • GLib ≥ @GLIB_REQ_VERSION@ • 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 ≥ @GDK_PIXBUF_REQ_VERSION@ - for image loading • Cairo ≥ @CAIRO_REQ_VERSION@ - for debugging texture atlasing (debug builds only) The optional Cogl Pango library requires: • Cairo ≥ @CAIRO_REQ_VERSION@ • PangoCairo ≥ @PANGOCAIRO_REQ_VERSION@ On X11, Cogl depends on the following extensions • XComposite ≥ @XCOMPOSITE_REQ_VERSION@ • XDamage • XExt • XFixes ≥ @XFIXES_REQ_VERSION@ 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: http://www.khronos.org If you are building the API reference you will also need: • GTK-Doc ≥ @GTK_DOC_REQ_VERSION@ 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 ≥ @GI_REQ_VERSION@ GObject-Introspection is available from: git://git.gnome.org/gobject-introspection If you want support for profiling Cogl you will also need: • UProf ≥ @UPROF_REQ_VERSION@ UProf is available from: git://github.com/rib/UProf.git -- DOCUMENTATION ------------------------------------------------------------------------------- The API references for the latest stable release are available at: http://docs.clutter-project.org/docs/cogl/stable/ The experimental 2.0 API can be found here: http://docs.clutter-project.org/docs/cogl-2.0-experimental/stable/ Note: The confusing "stable" at the end refers to the overall Cogl release status, not the documentation specifically. -- LICENSE ------------------------------------------------------------------------------- Most of Cogl is licensed under the terms of the GNU Lesser General Public License, version 2.1 or (at your option) later. Some files are licensed under more permissive licenses MIT or BSD style licenses though so please see individual files for details. -- BUILDING AND INSTALLATION ------------------------------------------------------------------------------- Please refer to the INSTALL document. -- BUGS ------------------------------------------------------------------------------- Please report bugs here: http://bugzilla.gnome.org/enter_bug.cgi?product=cogl You will need a Bugzilla account. Please include the following in bug reports: • what system you're running Cogl on; • which version of Cogl you are using; • which version of GLib and OpenGL (or OpenGL ES) you are using; • which video card and which drivers you are using, including output of glxinfo and xdpyinfo (if applicable); • how to reproduce the bug. If you cannot reproduce the bug with one of the tests that come with Cogl's source code, it can help a lot to include a small test case displaying the bad behaviour. If the bug exposes a crash, the exact text printed out and a stack trace obtained using gdb are greatly appreciated. -- CONTRIBUTING ------------------------------------------------------------------------------- The CODING_STYLE file describes the coding style we use throughout Cogl, please try your best to conform to this style because the consistency really helps keep the code maintainable. We can accept contributions in several ways: • Either as patches attached to bugs on bugzilla - For this you may be interested in using git-bz. See http://git.fishsoup.net/man/git-bz.html for details • You can email us patches - For this we recommend using git-send-email • You can create a remote branch and ask us to pull from that for more substantial changes. - For this we recommend using github. Ideally standalone patches should be created using git format-patch since that makes it easiest to import the patch with a commit message into a git repository.