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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.
118 lines
3.3 KiB
C
118 lines
3.3 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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#ifndef __COGL_CONTEXT_WINSYS_H
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#define __COGL_CONTEXT_WINSYS_H
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#ifdef COGL_HAS_XLIB_SUPPORT
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#include <X11/extensions/Xdamage.h>
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#include <X11/Xlib.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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typedef enum
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{
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COGL_WINSYS_FEATURE_TEXTURE_FROM_PIXMAP = 1
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} CoglWinsysFeatureFlags;
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#ifdef COGL_HAS_XLIB_SUPPORT
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typedef struct _CoglXlibTrapState CoglXlibTrapState;
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struct _CoglXlibTrapState
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{
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/* These values are intended to be internal to
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_cogl_xlib_{un,}trap_errors but they need to be in the header so
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that the struct can be allocated on the stack */
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int (* old_error_handler) (Display *, XErrorEvent *);
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int trapped_error_code;
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CoglXlibTrapState *old_state;
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};
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#endif /* COGL_HAS_XLIB_SUPPORT */
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#ifdef COGL_HAS_GLX_SUPPORT
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typedef struct
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{
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/* This will be -1 if there is no cached config in this slot */
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int depth;
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GLXFBConfig fb_config;
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gboolean can_mipmap;
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} CoglWinsysCachedConfig;
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#define COGL_WINSYS_N_CACHED_CONFIGS 3
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typedef enum
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{
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COGL_WINSYS_RECTANGLE_STATE_UNKNOWN,
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COGL_WINSYS_RECTANGLE_STATE_DISABLE,
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COGL_WINSYS_RECTANGLE_STATE_ENABLE
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} CoglWinsysRectangleState;
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#endif /* COGL_HAS_GLX_SUPPORT */
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typedef struct
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{
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/* These are specific to winsys backends supporting Xlib. This
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should probably eventually be moved into a separate file specific
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to Xlib when Cogl gains a more complete winsys abstraction */
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#ifdef COGL_HAS_XLIB_SUPPORT
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/* This will be -1 if the damage extension is not support, or it
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will be the event number offset for damage events if it is */
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int damage_base;
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/* List of callback functions that will be given every Xlib event */
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GSList *event_filters;
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/* Current top of the XError trap state stack. The actual memory for
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these is expected to be allocated on the stack by the caller */
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CoglXlibTrapState *trap_state;
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#endif
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#ifdef COGL_HAS_GLX_SUPPORT
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CoglWinsysCachedConfig glx_cached_configs[COGL_WINSYS_N_CACHED_CONFIGS];
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/* Whether the texture rectangle extension should be used */
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CoglWinsysRectangleState rectangle_state;
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#endif
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/* Function pointers for winsys specific extensions */
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#define COGL_WINSYS_FEATURE_BEGIN(a, b, c, d, e)
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#define COGL_WINSYS_FEATURE_FUNCTION(ret, name, args) \
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ret (APIENTRY * pf_ ## name) args;
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#define COGL_WINSYS_FEATURE_END()
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#include "cogl-winsys-feature-functions.h"
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#undef COGL_WINSYS_FEATURE_BEGIN
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#undef COGL_WINSYS_FEATURE_FUNCTION
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#undef COGL_WINSYS_FEATURE_END
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CoglWinsysFeatureFlags feature_flags;
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} CoglContextWinsys;
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#endif /* __COGL_CONTEXT_WINSYS_H */
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