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mutter/cogl/cogl-feature-private.c

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cogl: Make it easier to add checks for GL extensions Previously if you need to depend on a new GL feature you had to: - Add typedefs for all of the functions in cogl-defines.h.in - Add function pointers for each of the functions in cogl-context-driver.h - Add an initializer for the function pointers in cogl-context-driver.c - Add a check for the extension and all of the functions in cogl_features_init. If the extension is available under multiple names then you have to duplicate the checks. This is quite tedious and error prone. This patch moves all of the features and their functions into a list of macro invocations in cogl-feature-functions.h. The macros can be redefined to implement all of the above tasks from the same header. The features are described in a struct with a pointer to a table of functions. A new function takes the feature description from this struct and checks for its availability. The feature can take a list of extension names with a list of alternate namespaces (such as "EXT" or "ARB"). It can also detect the feature from a particular version of GL. The typedefs are now gone and instead the function pointer in the Cogl context just directly contains the type. Some of the functions in the context were previously declared with the 'ARB' extension. This has been removed so that now all the functions have no suffix. This makes more sense when the extension could potentially be merged into GL core as well.
2009-11-17 13:52:40 +00:00
/*
* Cogl
*
* An object oriented GL/GLES Abstraction/Utility Layer
*
* Copyright (C) 2009 Intel Corporation.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include "cogl.h"
#include "cogl-context.h"
#include "cogl-feature-private.h"
gboolean
_cogl_feature_check (const CoglFeatureData *data,
cogl: improves header and coding style consistency We've had complaints that our Cogl code/headers are a bit "special" so this is a first pass at tidying things up by giving them some consistency. These changes are all consistent with how new code in Cogl is being written, but the style isn't consistently applied across all code yet. There are two parts to this patch; but since each one required a large amount of effort to maintain tidy indenting it made sense to combine the changes to reduce the time spent re indenting the same lines. The first change is to use a consistent style for declaring function prototypes in headers. Cogl headers now consistently use this style for prototypes: return_type cogl_function_name (CoglType arg0, CoglType arg1); Not everyone likes this style, but it seems that most of the currently active Cogl developers agree on it. The second change is to constrain the use of redundant glib data types in Cogl. Uses of gint, guint, gfloat, glong, gulong and gchar have all been replaced with int, unsigned int, float, long, unsigned long and char respectively. When talking about pixel data; use of guchar has been replaced with guint8, otherwise unsigned char can be used. The glib types that we continue to use for portability are gboolean, gint{8,16,32,64}, guint{8,16,32,64} and gsize. The general intention is that Cogl should look palatable to the widest range of C programmers including those outside the Gnome community so - especially for the public API - we want to minimize the number of foreign looking typedefs.
2010-02-10 01:57:32 +00:00
unsigned int gl_major,
unsigned int gl_minor,
const char *extensions_string)
cogl: Make it easier to add checks for GL extensions Previously if you need to depend on a new GL feature you had to: - Add typedefs for all of the functions in cogl-defines.h.in - Add function pointers for each of the functions in cogl-context-driver.h - Add an initializer for the function pointers in cogl-context-driver.c - Add a check for the extension and all of the functions in cogl_features_init. If the extension is available under multiple names then you have to duplicate the checks. This is quite tedious and error prone. This patch moves all of the features and their functions into a list of macro invocations in cogl-feature-functions.h. The macros can be redefined to implement all of the above tasks from the same header. The features are described in a struct with a pointer to a table of functions. A new function takes the feature description from this struct and checks for its availability. The feature can take a list of extension names with a list of alternate namespaces (such as "EXT" or "ARB"). It can also detect the feature from a particular version of GL. The typedefs are now gone and instead the function pointer in the Cogl context just directly contains the type. Some of the functions in the context were previously declared with the 'ARB' extension. This has been removed so that now all the functions have no suffix. This makes more sense when the extension could potentially be merged into GL core as well.
2009-11-17 13:52:40 +00:00
{
cogl: improves header and coding style consistency We've had complaints that our Cogl code/headers are a bit "special" so this is a first pass at tidying things up by giving them some consistency. These changes are all consistent with how new code in Cogl is being written, but the style isn't consistently applied across all code yet. There are two parts to this patch; but since each one required a large amount of effort to maintain tidy indenting it made sense to combine the changes to reduce the time spent re indenting the same lines. The first change is to use a consistent style for declaring function prototypes in headers. Cogl headers now consistently use this style for prototypes: return_type cogl_function_name (CoglType arg0, CoglType arg1); Not everyone likes this style, but it seems that most of the currently active Cogl developers agree on it. The second change is to constrain the use of redundant glib data types in Cogl. Uses of gint, guint, gfloat, glong, gulong and gchar have all been replaced with int, unsigned int, float, long, unsigned long and char respectively. When talking about pixel data; use of guchar has been replaced with guint8, otherwise unsigned char can be used. The glib types that we continue to use for portability are gboolean, gint{8,16,32,64}, guint{8,16,32,64} and gsize. The general intention is that Cogl should look palatable to the widest range of C programmers including those outside the Gnome community so - especially for the public API - we want to minimize the number of foreign looking typedefs.
2010-02-10 01:57:32 +00:00
const char *suffix = NULL;
cogl: Make it easier to add checks for GL extensions Previously if you need to depend on a new GL feature you had to: - Add typedefs for all of the functions in cogl-defines.h.in - Add function pointers for each of the functions in cogl-context-driver.h - Add an initializer for the function pointers in cogl-context-driver.c - Add a check for the extension and all of the functions in cogl_features_init. If the extension is available under multiple names then you have to duplicate the checks. This is quite tedious and error prone. This patch moves all of the features and their functions into a list of macro invocations in cogl-feature-functions.h. The macros can be redefined to implement all of the above tasks from the same header. The features are described in a struct with a pointer to a table of functions. A new function takes the feature description from this struct and checks for its availability. The feature can take a list of extension names with a list of alternate namespaces (such as "EXT" or "ARB"). It can also detect the feature from a particular version of GL. The typedefs are now gone and instead the function pointer in the Cogl context just directly contains the type. Some of the functions in the context were previously declared with the 'ARB' extension. This has been removed so that now all the functions have no suffix. This makes more sense when the extension could potentially be merged into GL core as well.
2009-11-17 13:52:40 +00:00
int func_num;
_COGL_GET_CONTEXT (ctx, FALSE);
/* First check whether the functions should be directly provided by
GL */
if (COGL_CHECK_GL_VERSION (gl_major, gl_minor,
data->min_gl_major, data->min_gl_minor))
suffix = "";
else
{
/* Otherwise try all of the extensions */
cogl: improves header and coding style consistency We've had complaints that our Cogl code/headers are a bit "special" so this is a first pass at tidying things up by giving them some consistency. These changes are all consistent with how new code in Cogl is being written, but the style isn't consistently applied across all code yet. There are two parts to this patch; but since each one required a large amount of effort to maintain tidy indenting it made sense to combine the changes to reduce the time spent re indenting the same lines. The first change is to use a consistent style for declaring function prototypes in headers. Cogl headers now consistently use this style for prototypes: return_type cogl_function_name (CoglType arg0, CoglType arg1); Not everyone likes this style, but it seems that most of the currently active Cogl developers agree on it. The second change is to constrain the use of redundant glib data types in Cogl. Uses of gint, guint, gfloat, glong, gulong and gchar have all been replaced with int, unsigned int, float, long, unsigned long and char respectively. When talking about pixel data; use of guchar has been replaced with guint8, otherwise unsigned char can be used. The glib types that we continue to use for portability are gboolean, gint{8,16,32,64}, guint{8,16,32,64} and gsize. The general intention is that Cogl should look palatable to the widest range of C programmers including those outside the Gnome community so - especially for the public API - we want to minimize the number of foreign looking typedefs.
2010-02-10 01:57:32 +00:00
const char *namespace, *namespace_suffix;
unsigned int namespace_len;
cogl: Make it easier to add checks for GL extensions Previously if you need to depend on a new GL feature you had to: - Add typedefs for all of the functions in cogl-defines.h.in - Add function pointers for each of the functions in cogl-context-driver.h - Add an initializer for the function pointers in cogl-context-driver.c - Add a check for the extension and all of the functions in cogl_features_init. If the extension is available under multiple names then you have to duplicate the checks. This is quite tedious and error prone. This patch moves all of the features and their functions into a list of macro invocations in cogl-feature-functions.h. The macros can be redefined to implement all of the above tasks from the same header. The features are described in a struct with a pointer to a table of functions. A new function takes the feature description from this struct and checks for its availability. The feature can take a list of extension names with a list of alternate namespaces (such as "EXT" or "ARB"). It can also detect the feature from a particular version of GL. The typedefs are now gone and instead the function pointer in the Cogl context just directly contains the type. Some of the functions in the context were previously declared with the 'ARB' extension. This has been removed so that now all the functions have no suffix. This makes more sense when the extension could potentially be merged into GL core as well.
2009-11-17 13:52:40 +00:00
for (namespace = data->namespaces;
*namespace;
namespace += strlen (namespace) + 1)
{
cogl: improves header and coding style consistency We've had complaints that our Cogl code/headers are a bit "special" so this is a first pass at tidying things up by giving them some consistency. These changes are all consistent with how new code in Cogl is being written, but the style isn't consistently applied across all code yet. There are two parts to this patch; but since each one required a large amount of effort to maintain tidy indenting it made sense to combine the changes to reduce the time spent re indenting the same lines. The first change is to use a consistent style for declaring function prototypes in headers. Cogl headers now consistently use this style for prototypes: return_type cogl_function_name (CoglType arg0, CoglType arg1); Not everyone likes this style, but it seems that most of the currently active Cogl developers agree on it. The second change is to constrain the use of redundant glib data types in Cogl. Uses of gint, guint, gfloat, glong, gulong and gchar have all been replaced with int, unsigned int, float, long, unsigned long and char respectively. When talking about pixel data; use of guchar has been replaced with guint8, otherwise unsigned char can be used. The glib types that we continue to use for portability are gboolean, gint{8,16,32,64}, guint{8,16,32,64} and gsize. The general intention is that Cogl should look palatable to the widest range of C programmers including those outside the Gnome community so - especially for the public API - we want to minimize the number of foreign looking typedefs.
2010-02-10 01:57:32 +00:00
const char *extension;
cogl: Make it easier to add checks for GL extensions Previously if you need to depend on a new GL feature you had to: - Add typedefs for all of the functions in cogl-defines.h.in - Add function pointers for each of the functions in cogl-context-driver.h - Add an initializer for the function pointers in cogl-context-driver.c - Add a check for the extension and all of the functions in cogl_features_init. If the extension is available under multiple names then you have to duplicate the checks. This is quite tedious and error prone. This patch moves all of the features and their functions into a list of macro invocations in cogl-feature-functions.h. The macros can be redefined to implement all of the above tasks from the same header. The features are described in a struct with a pointer to a table of functions. A new function takes the feature description from this struct and checks for its availability. The feature can take a list of extension names with a list of alternate namespaces (such as "EXT" or "ARB"). It can also detect the feature from a particular version of GL. The typedefs are now gone and instead the function pointer in the Cogl context just directly contains the type. Some of the functions in the context were previously declared with the 'ARB' extension. This has been removed so that now all the functions have no suffix. This makes more sense when the extension could potentially be merged into GL core as well.
2009-11-17 13:52:40 +00:00
GString *full_extension_name = g_string_new ("");
/* If the namespace part contains a ':' then the suffix for
the function names is different from the name space */
if ((namespace_suffix = strchr (namespace, ':')))
{
namespace_len = namespace_suffix - namespace;
namespace_suffix++;
}
else
{
namespace_len = strlen (namespace);
namespace_suffix = namespace;
}
for (extension = data->extension_names;
*extension;
extension += strlen (extension) + 1)
{
g_string_set_size (full_extension_name, 0);
g_string_append (full_extension_name, "GL_");
g_string_append_len (full_extension_name,
namespace, namespace_len);
g_string_append_c (full_extension_name, '_');
g_string_append (full_extension_name, extension);
cogl: deprecates cogl_check_extension OpenGL is an implementation detail for Cogl so it's not appropriate to expose OpenGL extensions through the Cogl API. Note: Clutter is currently still using this API, because it is still doing raw GL calls in ClutterGLXTexturePixmap, so this introduces a couple of (legitimate) build warnings while compiling Clutter.
2010-02-05 16:32:19 +00:00
if (!_cogl_check_extension (full_extension_name->str,
extensions_string))
cogl: Make it easier to add checks for GL extensions Previously if you need to depend on a new GL feature you had to: - Add typedefs for all of the functions in cogl-defines.h.in - Add function pointers for each of the functions in cogl-context-driver.h - Add an initializer for the function pointers in cogl-context-driver.c - Add a check for the extension and all of the functions in cogl_features_init. If the extension is available under multiple names then you have to duplicate the checks. This is quite tedious and error prone. This patch moves all of the features and their functions into a list of macro invocations in cogl-feature-functions.h. The macros can be redefined to implement all of the above tasks from the same header. The features are described in a struct with a pointer to a table of functions. A new function takes the feature description from this struct and checks for its availability. The feature can take a list of extension names with a list of alternate namespaces (such as "EXT" or "ARB"). It can also detect the feature from a particular version of GL. The typedefs are now gone and instead the function pointer in the Cogl context just directly contains the type. Some of the functions in the context were previously declared with the 'ARB' extension. This has been removed so that now all the functions have no suffix. This makes more sense when the extension could potentially be merged into GL core as well.
2009-11-17 13:52:40 +00:00
break;
}
g_string_free (full_extension_name, TRUE);
/* If we found all of the extensions with this namespace
then use it as the suffix */
if (*extension == '\0')
{
suffix = namespace_suffix;
break;
}
}
}
/* If we couldn't find anything that provides the functions then
give up */
if (suffix == NULL)
return FALSE;
/* Try to get all of the entry points */
for (func_num = 0; data->functions[func_num].name; func_num++)
{
void *func;
cogl: improves header and coding style consistency We've had complaints that our Cogl code/headers are a bit "special" so this is a first pass at tidying things up by giving them some consistency. These changes are all consistent with how new code in Cogl is being written, but the style isn't consistently applied across all code yet. There are two parts to this patch; but since each one required a large amount of effort to maintain tidy indenting it made sense to combine the changes to reduce the time spent re indenting the same lines. The first change is to use a consistent style for declaring function prototypes in headers. Cogl headers now consistently use this style for prototypes: return_type cogl_function_name (CoglType arg0, CoglType arg1); Not everyone likes this style, but it seems that most of the currently active Cogl developers agree on it. The second change is to constrain the use of redundant glib data types in Cogl. Uses of gint, guint, gfloat, glong, gulong and gchar have all been replaced with int, unsigned int, float, long, unsigned long and char respectively. When talking about pixel data; use of guchar has been replaced with guint8, otherwise unsigned char can be used. The glib types that we continue to use for portability are gboolean, gint{8,16,32,64}, guint{8,16,32,64} and gsize. The general intention is that Cogl should look palatable to the widest range of C programmers including those outside the Gnome community so - especially for the public API - we want to minimize the number of foreign looking typedefs.
2010-02-10 01:57:32 +00:00
char *full_function_name;
cogl: Make it easier to add checks for GL extensions Previously if you need to depend on a new GL feature you had to: - Add typedefs for all of the functions in cogl-defines.h.in - Add function pointers for each of the functions in cogl-context-driver.h - Add an initializer for the function pointers in cogl-context-driver.c - Add a check for the extension and all of the functions in cogl_features_init. If the extension is available under multiple names then you have to duplicate the checks. This is quite tedious and error prone. This patch moves all of the features and their functions into a list of macro invocations in cogl-feature-functions.h. The macros can be redefined to implement all of the above tasks from the same header. The features are described in a struct with a pointer to a table of functions. A new function takes the feature description from this struct and checks for its availability. The feature can take a list of extension names with a list of alternate namespaces (such as "EXT" or "ARB"). It can also detect the feature from a particular version of GL. The typedefs are now gone and instead the function pointer in the Cogl context just directly contains the type. Some of the functions in the context were previously declared with the 'ARB' extension. This has been removed so that now all the functions have no suffix. This makes more sense when the extension could potentially be merged into GL core as well.
2009-11-17 13:52:40 +00:00
full_function_name = g_strconcat (data->functions[func_num].name,
suffix, NULL);
func = cogl_get_proc_address (full_function_name);
g_free (full_function_name);
if (func == NULL)
break;
/* Set the function pointer in the context */
cogl: improves header and coding style consistency We've had complaints that our Cogl code/headers are a bit "special" so this is a first pass at tidying things up by giving them some consistency. These changes are all consistent with how new code in Cogl is being written, but the style isn't consistently applied across all code yet. There are two parts to this patch; but since each one required a large amount of effort to maintain tidy indenting it made sense to combine the changes to reduce the time spent re indenting the same lines. The first change is to use a consistent style for declaring function prototypes in headers. Cogl headers now consistently use this style for prototypes: return_type cogl_function_name (CoglType arg0, CoglType arg1); Not everyone likes this style, but it seems that most of the currently active Cogl developers agree on it. The second change is to constrain the use of redundant glib data types in Cogl. Uses of gint, guint, gfloat, glong, gulong and gchar have all been replaced with int, unsigned int, float, long, unsigned long and char respectively. When talking about pixel data; use of guchar has been replaced with guint8, otherwise unsigned char can be used. The glib types that we continue to use for portability are gboolean, gint{8,16,32,64}, guint{8,16,32,64} and gsize. The general intention is that Cogl should look palatable to the widest range of C programmers including those outside the Gnome community so - especially for the public API - we want to minimize the number of foreign looking typedefs.
2010-02-10 01:57:32 +00:00
*(void **) ((guint8 *) ctx +
cogl: Make it easier to add checks for GL extensions Previously if you need to depend on a new GL feature you had to: - Add typedefs for all of the functions in cogl-defines.h.in - Add function pointers for each of the functions in cogl-context-driver.h - Add an initializer for the function pointers in cogl-context-driver.c - Add a check for the extension and all of the functions in cogl_features_init. If the extension is available under multiple names then you have to duplicate the checks. This is quite tedious and error prone. This patch moves all of the features and their functions into a list of macro invocations in cogl-feature-functions.h. The macros can be redefined to implement all of the above tasks from the same header. The features are described in a struct with a pointer to a table of functions. A new function takes the feature description from this struct and checks for its availability. The feature can take a list of extension names with a list of alternate namespaces (such as "EXT" or "ARB"). It can also detect the feature from a particular version of GL. The typedefs are now gone and instead the function pointer in the Cogl context just directly contains the type. Some of the functions in the context were previously declared with the 'ARB' extension. This has been removed so that now all the functions have no suffix. This makes more sense when the extension could potentially be merged into GL core as well.
2009-11-17 13:52:40 +00:00
data->functions[func_num].pointer_offset) = func;
}
/* If one of the functions wasn't found then we should set all of
the function pointers back to NULL so that the rest of Cogl can
safely do feature testing by just looking at the function
pointers */
if (data->functions[func_num].name)
{
while (func_num-- > 0)
cogl: improves header and coding style consistency We've had complaints that our Cogl code/headers are a bit "special" so this is a first pass at tidying things up by giving them some consistency. These changes are all consistent with how new code in Cogl is being written, but the style isn't consistently applied across all code yet. There are two parts to this patch; but since each one required a large amount of effort to maintain tidy indenting it made sense to combine the changes to reduce the time spent re indenting the same lines. The first change is to use a consistent style for declaring function prototypes in headers. Cogl headers now consistently use this style for prototypes: return_type cogl_function_name (CoglType arg0, CoglType arg1); Not everyone likes this style, but it seems that most of the currently active Cogl developers agree on it. The second change is to constrain the use of redundant glib data types in Cogl. Uses of gint, guint, gfloat, glong, gulong and gchar have all been replaced with int, unsigned int, float, long, unsigned long and char respectively. When talking about pixel data; use of guchar has been replaced with guint8, otherwise unsigned char can be used. The glib types that we continue to use for portability are gboolean, gint{8,16,32,64}, guint{8,16,32,64} and gsize. The general intention is that Cogl should look palatable to the widest range of C programmers including those outside the Gnome community so - especially for the public API - we want to minimize the number of foreign looking typedefs.
2010-02-10 01:57:32 +00:00
*(void **) ((guint8 *) ctx +
cogl: Make it easier to add checks for GL extensions Previously if you need to depend on a new GL feature you had to: - Add typedefs for all of the functions in cogl-defines.h.in - Add function pointers for each of the functions in cogl-context-driver.h - Add an initializer for the function pointers in cogl-context-driver.c - Add a check for the extension and all of the functions in cogl_features_init. If the extension is available under multiple names then you have to duplicate the checks. This is quite tedious and error prone. This patch moves all of the features and their functions into a list of macro invocations in cogl-feature-functions.h. The macros can be redefined to implement all of the above tasks from the same header. The features are described in a struct with a pointer to a table of functions. A new function takes the feature description from this struct and checks for its availability. The feature can take a list of extension names with a list of alternate namespaces (such as "EXT" or "ARB"). It can also detect the feature from a particular version of GL. The typedefs are now gone and instead the function pointer in the Cogl context just directly contains the type. Some of the functions in the context were previously declared with the 'ARB' extension. This has been removed so that now all the functions have no suffix. This makes more sense when the extension could potentially be merged into GL core as well.
2009-11-17 13:52:40 +00:00
data->functions[func_num].pointer_offset) = NULL;
return FALSE;
}
else
return TRUE;
}
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