30c4678ff4
This adds three new internal API functions which can be used to retain the clip stack state and restore it later: _cogl_get_clip_stack _cogl_set_clip_stack _cogl_clip_stack_copy The functions are currently internal and not yet used but we may want to make them public in future to replace the cogl_clip_stack_save() and cogl_clip_stack_restore() APIs. The get function just returns the handle to the clip stack at the top of the stack of stacks and the set function just replaces it. The copy function makes a cheap copy of an existing stack by taking a reference to the top stack entry. This ends up working like a deep copy because there is no way to modify entries of a stack but it doesn't actually copy the data.
79 lines
2.1 KiB
C
79 lines
2.1 KiB
C
/*
|
|
* Cogl
|
|
*
|
|
* An object oriented GL/GLES Abstraction/Utility Layer
|
|
*
|
|
* Copyright (C) 2007,2008,2009,2010 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, see <http://www.gnu.org/licenses/>.
|
|
*
|
|
*
|
|
*/
|
|
|
|
#ifndef __COGL_CLIP_STATE_H
|
|
#define __COGL_CLIP_STATE_H
|
|
|
|
typedef struct _CoglClipState CoglClipState;
|
|
|
|
struct _CoglClipState
|
|
{
|
|
/* Stack of CoglClipStacks */
|
|
GSList *stacks;
|
|
|
|
gboolean stack_dirty;
|
|
gboolean stencil_used;
|
|
};
|
|
|
|
void
|
|
_cogl_clip_state_init (CoglClipState *state);
|
|
|
|
void
|
|
_cogl_clip_state_destroy (CoglClipState *state);
|
|
|
|
void
|
|
_cogl_clip_state_dirty (CoglClipState *state);
|
|
|
|
void
|
|
_cogl_clip_state_flush (CoglClipState *clip_state);
|
|
|
|
/* TODO: we may want to make these two functions public because they
|
|
* can be used to implement a better API than cogl_clip_stack_save()
|
|
* and cogl_clip_stack_restore().
|
|
*/
|
|
/*
|
|
* _cogl_get_clip_stack:
|
|
*
|
|
* Gets a handle to the current clip stack. This can be used to later
|
|
* return to the same clip stack state with _cogl_set_clip_stack(). A
|
|
* reference is not taken on the stack so if you want to keep it you
|
|
* should call cogl_handle_ref() or _cogl_clip_stack_copy().
|
|
*
|
|
* Return value: a handle to the current clip stack.
|
|
*/
|
|
CoglHandle
|
|
_cogl_get_clip_stack (void);
|
|
|
|
/*
|
|
* _cogl_set_clip_stack:
|
|
* @handle: a handle to the replacement clip stack
|
|
*
|
|
* Replaces the current clip stack with @handle.
|
|
*
|
|
* Return value: a handle to the current clip stack.
|
|
*/
|
|
void
|
|
_cogl_set_clip_stack (CoglHandle handle);
|
|
|
|
#endif /* __COGL_CLIP_STATE_H */
|