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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
Remove mentions of the FSF address Since using addresses that might change is something that finally the FSF acknowledge as a plausible scenario (after changing address twice), the license blurb in the source files should use the URI for getting the license in case the library did not come with it. Not that URIs cannot possibly change, but at least it's easier to set up a redirection at the same place. As a side note: this commit closes the oldes bug in Clutter's bug report tool. http://bugzilla.openedhand.com/show_bug.cgi?id=521
2010-03-01 12:56:10 +00:00
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
*
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
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <string.h>
#include "cogl.h"
cogl: rename cogl-context.h cogl-context-private.h Since we plan to add public cogl_context_* API we need to rename the current cogl-context.h which contains private member details.
2010-11-04 22:25:52 +00:00
#include "cogl-context-private.h"
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
#include "cogl-feature-private.h"
gboolean
Add internal _cogl_get_proc_address This adds an internal _cogl_get_proc_address that doesn't need a CoglContext. This will enable us to check driver features earlier.
2011-05-24 00:38:48 +00:00
_cogl_feature_check (const CoglWinsysVtable *winsys,
const char *driver_prefix,
cogl: Add the infrastructure for checking for winsys extensions This adds the framework needed to check for winsys specific extensions (such as GLX extensions) using a similar mechanism to the cogl-feature-functions header. There is a separate cogl-winsys-feature-functions header which will contain macros to list the extensions and functions. cogl_create_context_winsys now calls _cogl_feature_check for each of these functions. _cogl_feature_check has had to be changed to accept the driver prefix as the first parameter so that it can prepend "GLX" rather than "GL" in this case.
2010-06-02 16:55:56 +00:00
const CoglFeatureData *data,
Move all of the GL function pointers directly to CoglContext Instead of storing all of the feature function pointers in the driver specific data of the CoglContext they are now all stored directly in CoglContext. There is a single header containing the description of the functions which gets included by cogl-context.h. There is a single function in cogl-feature-private.c to check for all of these functions. The name of the function pointer variables have been changed from ctx->drv.pf_glWhatever to just ctx->glWhatever. The feature flags that get set when an extension is available are now separated from the table of extensions. This is necessary because different extensions can mean different things on GLES and GL. For example, having access to glMapBuffer implies read and write support on GL but only write support on GLES. The flags are instead set in the driver specific init function by checking whether the function pointers were successfully resolved. _cogl_feature_check has been changed to assume the feature is supported if any of the listed extensions are available instead of requiring all of them. This makes it more convenient to specify alternate names for the extension. Nothing else had previously listed more than one name for an extension so this shouldn't cause any problems.
2011-07-06 17:59:20 +00:00
int gl_major,
int gl_minor,
Dynamically load the GL or GLES library The GL or GLES library is now dynamically loaded by the CoglRenderer so that it can choose between GL, GLES1 and GLES2 at runtime. The library is loaded by the renderer because it needs to be done before calling eglInitialize. There is a new environment variable called COGL_DRIVER to choose between gl, gles1 or gles2. The #ifdefs for HAVE_COGL_GL, HAVE_COGL_GLES and HAVE_COGL_GLES2 have been changed so that they don't assume the ifdefs are mutually exclusive. They haven't been removed entirely so that it's possible to compile the GLES backends without the the enums from the GL headers. When using GLX the winsys additionally dynamically loads libGL because that also contains the GLX API. It can't be linked in directly because that would probably conflict with the GLES API if the EGL is selected. When compiling with EGL support the library links directly to libEGL because it doesn't contain any GL API so it shouldn't have any conflicts. When building for WGL or OSX Cogl still directly links against the GL API so there is a #define in config.h so that Cogl won't try to dlopen the library. Cogl-pango previously had a #ifdef to detect when the GL backend is used so that it can sneakily pass GL_QUADS to cogl_vertex_buffer_draw. This is now changed so that it queries the CoglContext for the backend. However to get this to work Cogl now needs to export the _cogl_context_get_default symbol and cogl-pango needs some extra -I flags to so that it can include cogl-context-private.h
2011-07-07 19:44:56 +00:00
CoglDriver driver,
Moves all GLX code down from Clutter to Cogl This migrates all the GLX window system code down from the Clutter backend code into a Cogl winsys. Moving OpenGL window system binding code down from Clutter into Cogl is the biggest blocker to having Cogl become a standalone 3D graphics library, so this is an important step in that direction.
2010-11-05 12:28:33 +00:00
const char *extensions_string,
void *function_table)
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;
/* First check whether the functions should be directly provided by
GL */
Dynamically load the GL or GLES library The GL or GLES library is now dynamically loaded by the CoglRenderer so that it can choose between GL, GLES1 and GLES2 at runtime. The library is loaded by the renderer because it needs to be done before calling eglInitialize. There is a new environment variable called COGL_DRIVER to choose between gl, gles1 or gles2. The #ifdefs for HAVE_COGL_GL, HAVE_COGL_GLES and HAVE_COGL_GLES2 have been changed so that they don't assume the ifdefs are mutually exclusive. They haven't been removed entirely so that it's possible to compile the GLES backends without the the enums from the GL headers. When using GLX the winsys additionally dynamically loads libGL because that also contains the GLX API. It can't be linked in directly because that would probably conflict with the GLES API if the EGL is selected. When compiling with EGL support the library links directly to libEGL because it doesn't contain any GL API so it shouldn't have any conflicts. When building for WGL or OSX Cogl still directly links against the GL API so there is a #define in config.h so that Cogl won't try to dlopen the library. Cogl-pango previously had a #ifdef to detect when the GL backend is used so that it can sneakily pass GL_QUADS to cogl_vertex_buffer_draw. This is now changed so that it queries the CoglContext for the backend. However to get this to work Cogl now needs to export the _cogl_context_get_default symbol and cogl-pango needs some extra -I flags to so that it can include cogl-context-private.h
2011-07-07 19:44:56 +00:00
if ((driver == COGL_DRIVER_GL &&
COGL_CHECK_GL_VERSION (gl_major, gl_minor,
data->min_gl_major, data->min_gl_minor)) ||
(driver == COGL_DRIVER_GLES1 &&
(data->gles_availability & COGL_EXT_IN_GLES)) ||
(driver == COGL_DRIVER_GLES2 &&
(data->gles_availability & COGL_EXT_IN_GLES2)))
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
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)
{
cogl: Add the infrastructure for checking for winsys extensions This adds the framework needed to check for winsys specific extensions (such as GLX extensions) using a similar mechanism to the cogl-feature-functions header. There is a separate cogl-winsys-feature-functions header which will contain macros to list the extensions and functions. cogl_create_context_winsys now calls _cogl_feature_check for each of these functions. _cogl_feature_check has had to be changed to accept the driver prefix as the first parameter so that it can prepend "GLX" rather than "GL" in this case.
2010-06-02 16:55:56 +00:00
g_string_assign (full_extension_name, driver_prefix);
g_string_append_c (full_extension_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
g_string_append_len (full_extension_name,
namespace, namespace_len);
g_string_append_c (full_extension_name, '_');
g_string_append (full_extension_name, extension);
Move all of the GL function pointers directly to CoglContext Instead of storing all of the feature function pointers in the driver specific data of the CoglContext they are now all stored directly in CoglContext. There is a single header containing the description of the functions which gets included by cogl-context.h. There is a single function in cogl-feature-private.c to check for all of these functions. The name of the function pointer variables have been changed from ctx->drv.pf_glWhatever to just ctx->glWhatever. The feature flags that get set when an extension is available are now separated from the table of extensions. This is necessary because different extensions can mean different things on GLES and GL. For example, having access to glMapBuffer implies read and write support on GL but only write support on GLES. The flags are instead set in the driver specific init function by checking whether the function pointers were successfully resolved. _cogl_feature_check has been changed to assume the feature is supported if any of the listed extensions are available instead of requiring all of them. This makes it more convenient to specify alternate names for the extension. Nothing else had previously listed more than one name for an extension so this shouldn't cause any problems.
2011-07-06 17:59:20 +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);
Move all of the GL function pointers directly to CoglContext Instead of storing all of the feature function pointers in the driver specific data of the CoglContext they are now all stored directly in CoglContext. There is a single header containing the description of the functions which gets included by cogl-context.h. There is a single function in cogl-feature-private.c to check for all of these functions. The name of the function pointer variables have been changed from ctx->drv.pf_glWhatever to just ctx->glWhatever. The feature flags that get set when an extension is available are now separated from the table of extensions. This is necessary because different extensions can mean different things on GLES and GL. For example, having access to glMapBuffer implies read and write support on GL but only write support on GLES. The flags are instead set in the driver specific init function by checking whether the function pointers were successfully resolved. _cogl_feature_check has been changed to assume the feature is supported if any of the listed extensions are available instead of requiring all of them. This makes it more convenient to specify alternate names for the extension. Nothing else had previously listed more than one name for an extension so this shouldn't cause any problems.
2011-07-06 17:59:20 +00:00
/* If we found an extension with this namespace then use it
as the suffix */
if (*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
{
suffix = namespace_suffix;
break;
}
}
}
/* If we couldn't find anything that provides the functions then
give up */
if (suffix == NULL)
Add internal _cogl_get_proc_address This adds an internal _cogl_get_proc_address that doesn't need a CoglContext. This will enable us to check driver features earlier.
2011-05-24 00:38:48 +00:00
goto error;
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
/* 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);
Add internal _cogl_get_proc_address This adds an internal _cogl_get_proc_address that doesn't need a CoglContext. This will enable us to check driver features earlier.
2011-05-24 00:38:48 +00:00
func = _cogl_get_proc_address (winsys, 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
g_free (full_function_name);
if (func == NULL)
Add internal _cogl_get_proc_address This adds an internal _cogl_get_proc_address that doesn't need a CoglContext. This will enable us to check driver features earlier.
2011-05-24 00:38:48 +00:00
goto error;
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
/* Set the function pointer in the context */
Moves all GLX code down from Clutter to Cogl This migrates all the GLX window system code down from the Clutter backend code into a Cogl winsys. Moving OpenGL window system binding code down from Clutter into Cogl is the biggest blocker to having Cogl become a standalone 3D graphics library, so this is an important step in that direction.
2010-11-05 12:28:33 +00:00
*(void **) ((guint8 *) function_table +
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;
}
Add internal _cogl_get_proc_address This adds an internal _cogl_get_proc_address that doesn't need a CoglContext. This will enable us to check driver features earlier.
2011-05-24 00:38:48 +00:00
return TRUE;
/* If the extension isn't found or one of the functions wasn't found
* then set all of the functions pointers to NULL so Cogl can safely
* do feature testing by just looking at the function pointers */
error:
for (func_num = 0; data->functions[func_num].name; func_num++)
*(void **) ((guint8 *) function_table +
data->functions[func_num].pointer_offset) = NULL;
return FALSE;
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
}
Move all of the GL function pointers directly to CoglContext Instead of storing all of the feature function pointers in the driver specific data of the CoglContext they are now all stored directly in CoglContext. There is a single header containing the description of the functions which gets included by cogl-context.h. There is a single function in cogl-feature-private.c to check for all of these functions. The name of the function pointer variables have been changed from ctx->drv.pf_glWhatever to just ctx->glWhatever. The feature flags that get set when an extension is available are now separated from the table of extensions. This is necessary because different extensions can mean different things on GLES and GL. For example, having access to glMapBuffer implies read and write support on GL but only write support on GLES. The flags are instead set in the driver specific init function by checking whether the function pointers were successfully resolved. _cogl_feature_check has been changed to assume the feature is supported if any of the listed extensions are available instead of requiring all of them. This makes it more convenient to specify alternate names for the extension. Nothing else had previously listed more than one name for an extension so this shouldn't cause any problems.
2011-07-06 17:59:20 +00:00
/* Define a set of arrays containing the functions required from GL
for each feature */
#define COGL_EXT_BEGIN(name, \
min_gl_major, min_gl_minor, \
gles_availability, \
namespaces, extension_names) \
static const CoglFeatureFunction cogl_ext_ ## name ## _funcs[] = {
#define COGL_EXT_FUNCTION(ret, name, args) \
{ G_STRINGIFY (name), G_STRUCT_OFFSET (CoglContext, name) },
#define COGL_EXT_END() \
{ NULL, 0 }, \
};
#include "cogl-ext-functions.h"
/* Define an array of features */
#undef COGL_EXT_BEGIN
#define COGL_EXT_BEGIN(name, \
min_gl_major, min_gl_minor, \
gles_availability, \
namespaces, extension_names) \
{ min_gl_major, min_gl_minor, gles_availability, namespaces, \
extension_names, 0, 0, 0, \
cogl_ext_ ## name ## _funcs },
#undef COGL_EXT_FUNCTION
#define COGL_EXT_FUNCTION(ret, name, args)
#undef COGL_EXT_END
#define COGL_EXT_END()
static const CoglFeatureData
cogl_feature_ext_functions_data[] =
{
#include "cogl-ext-functions.h"
};
void
_cogl_feature_check_ext_functions (CoglContext *context,
int gl_major,
int gl_minor,
Dynamically load the GL or GLES library The GL or GLES library is now dynamically loaded by the CoglRenderer so that it can choose between GL, GLES1 and GLES2 at runtime. The library is loaded by the renderer because it needs to be done before calling eglInitialize. There is a new environment variable called COGL_DRIVER to choose between gl, gles1 or gles2. The #ifdefs for HAVE_COGL_GL, HAVE_COGL_GLES and HAVE_COGL_GLES2 have been changed so that they don't assume the ifdefs are mutually exclusive. They haven't been removed entirely so that it's possible to compile the GLES backends without the the enums from the GL headers. When using GLX the winsys additionally dynamically loads libGL because that also contains the GLX API. It can't be linked in directly because that would probably conflict with the GLES API if the EGL is selected. When compiling with EGL support the library links directly to libEGL because it doesn't contain any GL API so it shouldn't have any conflicts. When building for WGL or OSX Cogl still directly links against the GL API so there is a #define in config.h so that Cogl won't try to dlopen the library. Cogl-pango previously had a #ifdef to detect when the GL backend is used so that it can sneakily pass GL_QUADS to cogl_vertex_buffer_draw. This is now changed so that it queries the CoglContext for the backend. However to get this to work Cogl now needs to export the _cogl_context_get_default symbol and cogl-pango needs some extra -I flags to so that it can include cogl-context-private.h
2011-07-07 19:44:56 +00:00
const char *gl_extensions)
Move all of the GL function pointers directly to CoglContext Instead of storing all of the feature function pointers in the driver specific data of the CoglContext they are now all stored directly in CoglContext. There is a single header containing the description of the functions which gets included by cogl-context.h. There is a single function in cogl-feature-private.c to check for all of these functions. The name of the function pointer variables have been changed from ctx->drv.pf_glWhatever to just ctx->glWhatever. The feature flags that get set when an extension is available are now separated from the table of extensions. This is necessary because different extensions can mean different things on GLES and GL. For example, having access to glMapBuffer implies read and write support on GL but only write support on GLES. The flags are instead set in the driver specific init function by checking whether the function pointers were successfully resolved. _cogl_feature_check has been changed to assume the feature is supported if any of the listed extensions are available instead of requiring all of them. This makes it more convenient to specify alternate names for the extension. Nothing else had previously listed more than one name for an extension so this shouldn't cause any problems.
2011-07-06 17:59:20 +00:00
{
int i;
for (i = 0; i < G_N_ELEMENTS (cogl_feature_ext_functions_data); i++)
_cogl_feature_check (_cogl_context_get_winsys (context),
"GL", cogl_feature_ext_functions_data + i,
Dynamically load the GL or GLES library The GL or GLES library is now dynamically loaded by the CoglRenderer so that it can choose between GL, GLES1 and GLES2 at runtime. The library is loaded by the renderer because it needs to be done before calling eglInitialize. There is a new environment variable called COGL_DRIVER to choose between gl, gles1 or gles2. The #ifdefs for HAVE_COGL_GL, HAVE_COGL_GLES and HAVE_COGL_GLES2 have been changed so that they don't assume the ifdefs are mutually exclusive. They haven't been removed entirely so that it's possible to compile the GLES backends without the the enums from the GL headers. When using GLX the winsys additionally dynamically loads libGL because that also contains the GLX API. It can't be linked in directly because that would probably conflict with the GLES API if the EGL is selected. When compiling with EGL support the library links directly to libEGL because it doesn't contain any GL API so it shouldn't have any conflicts. When building for WGL or OSX Cogl still directly links against the GL API so there is a #define in config.h so that Cogl won't try to dlopen the library. Cogl-pango previously had a #ifdef to detect when the GL backend is used so that it can sneakily pass GL_QUADS to cogl_vertex_buffer_draw. This is now changed so that it queries the CoglContext for the backend. However to get this to work Cogl now needs to export the _cogl_context_get_default symbol and cogl-pango needs some extra -I flags to so that it can include cogl-context-private.h
2011-07-07 19:44:56 +00:00
gl_major, gl_minor, context->driver,
Move all of the GL function pointers directly to CoglContext Instead of storing all of the feature function pointers in the driver specific data of the CoglContext they are now all stored directly in CoglContext. There is a single header containing the description of the functions which gets included by cogl-context.h. There is a single function in cogl-feature-private.c to check for all of these functions. The name of the function pointer variables have been changed from ctx->drv.pf_glWhatever to just ctx->glWhatever. The feature flags that get set when an extension is available are now separated from the table of extensions. This is necessary because different extensions can mean different things on GLES and GL. For example, having access to glMapBuffer implies read and write support on GL but only write support on GLES. The flags are instead set in the driver specific init function by checking whether the function pointers were successfully resolved. _cogl_feature_check has been changed to assume the feature is supported if any of the listed extensions are available instead of requiring all of them. This makes it more convenient to specify alternate names for the extension. Nothing else had previously listed more than one name for an extension so this shouldn't cause any problems.
2011-07-06 17:59:20 +00:00
gl_extensions,
context);
}
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