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This is a publicly exposed texture backend to create a texture which
contains the contents of an X11 pixmap. The API is currently marked as
experimental.
The backend internally holds a handle to another texture. All of the
backend virtuals simply redirect to the internal texture.
The texture can optionally be automatically updated if the
automatic_updates parameter is TRUE. If set then Cogl will listen for
damage events on the pixmap and update the texture accordingly.
Alternatively a damage object can be created externally and passed
down to Cogl.
The updates can be performed with XGetImage, XShmGetImage or the
GLX_EXT_texture_pixmap extension. If the TFP extension is used it will
optionally try to create a rectangle texture if the driver does not
support NPOTs or it is forced through the
COGL_PIXMAP_TEXTURE_RECTANGLE or CLUTTER_PIXMAP_TEXTURE_RECTANGLE
environment variables.
If the GLXFBConfig does not support mipmapping then it will fallback
to using X{Shm,}GetImage. It keeps a separate texture around for this
so that it can later start using the TFP texture again if the texture
is later drawn with mipmaps disabled.
147 lines
4.1 KiB
C
147 lines
4.1 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) 2010 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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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#ifdef COGL_HAS_GLX_SUPPORT
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#include <GL/glx.h>
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#endif
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#include "cogl-context.h"
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#include "cogl-feature-private.h"
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/* Define a set of arrays containing the functions required from GL
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for each winsys feature */
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#define COGL_WINSYS_FEATURE_BEGIN(name, namespaces, extension_names, \
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feature_flags, feature_flags_private) \
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static const CoglFeatureFunction \
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cogl_winsys_feature_ ## name ## _funcs[] = {
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#define COGL_WINSYS_FEATURE_FUNCTION(ret, name, args) \
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{ G_STRINGIFY (name), G_STRUCT_OFFSET (CoglContext, winsys.pf_ ## name) },
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#define COGL_WINSYS_FEATURE_END() \
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{ NULL, 0 }, \
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};
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#include "cogl-winsys-feature-functions.h"
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/* Define an array of features */
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#undef COGL_WINSYS_FEATURE_BEGIN
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#define COGL_WINSYS_FEATURE_BEGIN(name, namespaces, extension_names, \
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feature_flags, feature_flags_private) \
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{ 255, 255, namespaces, extension_names, \
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feature_flags, feature_flags_private, \
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cogl_winsys_feature_ ## name ## _funcs },
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#undef COGL_WINSYS_FEATURE_FUNCTION
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#define COGL_WINSYS_FEATURE_FUNCTION(ret, name, args)
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#undef COGL_WINSYS_FEATURE_END
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#define COGL_WINSYS_FEATURE_END()
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static const CoglFeatureData cogl_winsys_feature_data[] =
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{
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#include "cogl-winsys-feature-functions.h"
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};
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static const char *
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_cogl_get_winsys_extensions (void)
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{
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#ifdef COGL_HAS_GLX_SUPPORT
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Display *display = _cogl_xlib_get_display ();
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return glXQueryExtensionsString (display, DefaultScreen (display));
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#else
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return "";
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#endif
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}
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static void
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_cogl_winsys_features_init (CoglContext *context)
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{
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CoglWinsysFeatureFlags flags = 0;
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const char *extensions = _cogl_get_winsys_extensions ();
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int i;
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for (i = 0; i < G_N_ELEMENTS (cogl_winsys_feature_data); i++)
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if (_cogl_feature_check ("GLX", cogl_winsys_feature_data + i, 0, 0,
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extensions))
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flags |= cogl_winsys_feature_data[i].feature_flags;
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context->winsys.feature_flags = flags;
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}
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void
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_cogl_create_context_winsys (CoglContext *context)
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{
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#ifdef COGL_HAS_XLIB_SUPPORT
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{
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Display *display = _cogl_xlib_get_display ();
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int damage_error;
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/* Check whether damage events are supported on this display */
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if (!XDamageQueryExtension (display,
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&context->winsys.damage_base,
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&damage_error))
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context->winsys.damage_base = -1;
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context->winsys.event_filters = NULL;
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context->winsys.trap_state = NULL;
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}
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#endif
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#ifdef COGL_HAS_GLX_SUPPORT
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{
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int i;
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for (i = 0; i < COGL_WINSYS_N_CACHED_CONFIGS; i++)
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context->winsys.glx_cached_configs[i].depth = -1;
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context->winsys.rectangle_state = COGL_WINSYS_RECTANGLE_STATE_UNKNOWN;
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}
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#endif
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_cogl_winsys_features_init (context);
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}
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#ifdef COGL_HAS_XLIB_SUPPORT
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#include "cogl-xlib.h"
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static void
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free_xlib_filter_closure (gpointer data, gpointer user_data)
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{
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g_slice_free (CoglXlibFilterClosure, data);
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}
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#endif
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void
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_cogl_destroy_context_winsys (CoglContext *context)
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{
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#ifdef COGL_HAS_XLIB_SUPPORT
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g_slist_foreach (context->winsys.event_filters,
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free_xlib_filter_closure, NULL);
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g_slist_free (context->winsys.event_filters);
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#endif
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}
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