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b6b9ac0b85
This adds a version header which contains macros to define which
version of Cogl the application is being compiled against. This helps
applications that want to support multiple incompatible versions of
Cogl at compile time.
The macros are called COGL_VERSION_{MAJOR,MINOR,MICRO}. This does not
match Clutter which names them CLUTTER_{MAJOR,MINOR,MICRO}_VERSION but
I think the former is nicer and it at least matches Cairo and Pango.
The values of the macro are defined to COGL_VERSION_*_INTERNAL which
is generated by the configure script into cogl-defines.h.
There is also a macro for the entire version as a string called
COGL_VERSION_STRING.
The internal utility macros for encoding a 3 part version number into
a single integer have been moved into the new header so they can be
used publicly as a convenient way to check if the version is within a
particular range. There is also a COGL_VERSION_CHECK macro for the
very common case that a feature will be used since a particular
version of Cogl. There is a macro called COGL_VERSION which contains
the pre-encoded version of Cogl being compiled against for
convenience.
Unlike in Clutter this patch does not add any runtime version
identification mechanism.
A test case is also added which just contains static asserts to sanity
check the macros.
Reviewed-by: Robert Bragg <robert@linux.intel.com>
(cherry picked from commit 3480cf140dc355fa87ab3fbcf0aeeb0124798a8f)
185 lines
5.1 KiB
C
185 lines
5.1 KiB
C
/*
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* Cogl
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*
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* An object oriented GL/GLES Abstraction/Utility Layer
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*
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* Copyright (C) 2012 Intel Corporation.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*
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*
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*/
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#ifndef __COGL_VERSION_H__
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#define __COGL_VERSION_H__
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#include <cogl/cogl-defines.h>
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/**
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* SECTION:cogl-version
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* @short_description: Macros for determining the version of Cogl being used
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*
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* Cogl offers a set of macros for checking the version of the library
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* at compile time.
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*
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* Since: 2.0
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*/
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/**
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* COGL_VERSION_MAJOR:
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*
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* The major version of the Cogl library (1, if %COGL_VERSION is 1.2.3)
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*
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* Since: 2.0
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*/
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#define COGL_VERSION_MAJOR COGL_VERSION_MAJOR_INTERNAL
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/**
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* COGL_VERSION_MINOR:
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*
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* The minor version of the Cogl library (2, if %COGL_VERSION is 1.2.3)
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*
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* Since: 2.0
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*/
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#define COGL_VERSION_MINOR COGL_VERSION_MINOR_INTERNAL
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/**
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* COGL_VERSION_MICRO:
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*
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* The micro version of the Cogl library (3, if %COGL_VERSION is 1.2.3)
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*
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* Since: 2.0
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*/
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#define COGL_VERSION_MICRO COGL_VERSION_MICRO_INTERNAL
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/**
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* COGL_VERSION_STRING:
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*
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* The full version of the Cogl library, in string form (suited for
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* string concatenation)
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*
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* Since: 2.0
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*/
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#define COGL_VERSION_STRING COGL_VERSION_STRING_INTERNAL
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/* Macros to handle compacting a 3-component version number into an
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* int for quick comparison. This assumes all of the components are <=
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* 1023 and that an int is >= 31 bits */
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#define COGL_VERSION_COMPONENT_BITS 10
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#define COGL_VERSION_MAX_COMPONENT_VALUE \
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((1 << COGL_VERSION_COMPONENT_BITS) - 1)
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/**
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* COGL_VERSION:
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*
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* The Cogl version encoded into a single integer using the
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* COGL_VERSION_ENCODE() macro. This can be used for quick comparisons
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* with particular versions.
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*
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* Since: 2.0
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*/
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#define COGL_VERSION \
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COGL_VERSION_ENCODE (COGL_VERSION_MAJOR, \
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COGL_VERSION_MINOR, \
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COGL_VERSION_MICRO)
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/**
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* COGL_VERSION_ENCODE:
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* @major: The major part of a version number
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* @minor: The minor part of a version number
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* @micro: The micro part of a version number
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*
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* Encodes a 3 part version number into a single integer. This can be
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* used to compare the Cogl version. For example if there is a known
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* bug in Cogl versions between 1.3.2 and 1.3.4 you could use the
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* following code to provide a workaround:
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*
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* |[
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* #if COGL_VERSION >= COGL_VERSION_ENCODE (1, 3, 2) && \
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* COGL_VERSION <= COGL_VERSION_ENCODE (1, 3, 4)
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* /<!-- -->* Do the workaround *<!-- -->/
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* #endif
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* ]|
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*
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* Since: 2.0
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*/
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#define COGL_VERSION_ENCODE(major, minor, micro) \
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(((major) << (COGL_VERSION_COMPONENT_BITS * 2)) | \
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((minor) << COGL_VERSION_COMPONENT_BITS) \
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| (micro))
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/**
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* COGL_VERSION_GET_MAJOR:
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* @version: An encoded version number
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*
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* Extracts the major part of an encoded version number.
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*
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* Since: 2.0
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*/
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#define COGL_VERSION_GET_MAJOR(version) \
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(((version) >> (COGL_VERSION_COMPONENT_BITS * 2)) \
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& COGL_VERSION_MAX_COMPONENT_VALUE)
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/**
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* COGL_VERSION_GET_MINOR:
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* @version: An encoded version number
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*
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* Extracts the minor part of an encoded version number.
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*
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* Since: 2.0
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*/
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#define COGL_VERSION_GET_MINOR(version) \
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(((version) >> COGL_VERSION_COMPONENT_BITS) & \
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COGL_VERSION_MAX_COMPONENT_VALUE)
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/**
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* COGL_VERSION_GET_MICRO:
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* @version: An encoded version number
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*
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* Extracts the micro part of an encoded version number.
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*
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* Since: 2.0
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*/
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#define COGL_VERSION_GET_MICRO(version) \
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((version) & COGL_VERSION_MAX_COMPONENT_VALUE)
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/**
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* COGL_VERSION_CHECK:
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* @major: The major part of a version number
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* @minor: The minor part of a version number
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* @micro: The micro part of a version number
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*
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* A convenient macro to check whether the Cogl version being compiled
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* against is at least the given version number. For example if the
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* function cogl_pipeline_frobnicate was added in version 2.0.1 and
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* you want to conditionally use that function when it is available,
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* you could write the following:
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*
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* |[
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* #if COGL_VERSION_CHECK (2, 0, 1)
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* cogl_pipeline_frobnicate (pipeline);
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* #else
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* /<!-- -->* Frobnication is not supported. Use a red color instead *<!-- -->/
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* cogl_pipeline_set_color_4f (pipeline, 1.0f, 0.0f, 0.0f, 1.0f);
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* #endif
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* ]|
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*
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* Return value: %TRUE if the Cogl version being compiled against is
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* greater than or equal to the given three part version number.
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*/
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#define COGL_VERSION_CHECK(major, minor, micro) \
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(COGL_VERSION >= COGL_VERSION_ENCODE (major, minor, micro))
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#endif /* __COGL_VERSION_H__ */
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