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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
/*
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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) 2007,2008,2009,2010 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_CLIP_STATE_H
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#define __COGL_CLIP_STATE_H
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typedef struct _CoglClipState CoglClipState;
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struct _CoglClipState
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{
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/* Stack of CoglClipStacks */
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GSList *stacks;
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gboolean stack_dirty;
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gboolean stencil_used;
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};
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void
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_cogl_clip_state_init (CoglClipState *state);
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void
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_cogl_clip_state_destroy (CoglClipState *state);
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void
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_cogl_clip_state_dirty (CoglClipState *state);
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void
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_cogl_clip_state_flush (CoglClipState *clip_state);
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/* TODO: we may want to make these two functions public because they
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* can be used to implement a better API than cogl_clip_stack_save()
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* and cogl_clip_stack_restore().
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*/
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/*
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* _cogl_get_clip_stack:
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*
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* Gets a handle to the current clip stack. This can be used to later
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* return to the same clip stack state with _cogl_set_clip_stack(). A
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* reference is not taken on the stack so if you want to keep it you
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* should call cogl_handle_ref() or _cogl_clip_stack_copy().
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*
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* Return value: a handle to the current clip stack.
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*/
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CoglHandle
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_cogl_get_clip_stack (void);
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/*
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* _cogl_set_clip_stack:
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* @handle: a handle to the replacement clip stack
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*
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* Replaces the current clip stack with @handle.
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*
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* Return value: a handle to the current clip stack.
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*/
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void
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_cogl_set_clip_stack (CoglHandle handle);
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#endif /* __COGL_CLIP_STATE_H */
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