mutter/cogl/cogl-offscreen.h

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/*
* Cogl
*
* An object oriented GL/GLES Abstraction/Utility Layer
*
* Copyright (C) 2007,2008,2009 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
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#if !defined(__COGL_H_INSIDE__) && !defined(CLUTTER_COMPILATION)
#error "Only <cogl/cogl.h> can be included directly."
#endif
#ifndef __COGL_OFFSCREEN_H__
#define __COGL_OFFSCREEN_H__
#include <cogl/cogl-types.h>
G_BEGIN_DECLS
/**
* SECTION:cogl-offscreen
* @short_description: Fuctions for creating and manipulating offscreen
* frame buffer objects
*
* Cogl allows creating and operating on offscreen render targets.
*/
/* Offscreen api */
/**
* cogl_offscreen_new_to_texture:
* @handle: A CoglHandle for a Cogl texture
*
* This creates an offscreen buffer object using the given texture as the
* primary color buffer. It doesn't just initialize the contents of the
* offscreen buffer with the texture; they are tightly bound so that
* drawing to the offscreen buffer effectivly updates the contents of the
* given texture. You don't need to destroy the offscreen buffer before
* you can use the texture again.
*
* Note: This does not work with sliced Cogl textures.
*
* Returns: a #CoglHandle for the new offscreen buffer or %COGL_INVALID_HANDLE
* if it wasn't possible to create the buffer.
*/
CoglHandle cogl_offscreen_new_to_texture (CoglHandle handle);
/**
* cogl_offscreen_ref:
* @handle: A CoglHandle for an offscreen buffer
*
* Increments the reference count on the offscreen buffer.
*
* Returns: For convenience it returns the given CoglHandle
*/
CoglHandle cogl_offscreen_ref (CoglHandle handle);
/**
* cogl_is_offscreen:
* @handle: A CoglHandle for an offscreen buffer
*
* Gets whether the given handle references an existing offscreen buffer
* object.
*
* Returns: %TRUE if the handle references an offscreen buffer,
* %FALSE otherwise
*/
gboolean cogl_is_offscreen (CoglHandle handle);
/**
* cogl_offscreen_unref:
* @handle: A CoglHandle for an offscreen buffer
*
* Decreases the reference count for the offscreen buffer and frees it when
* the count reaches 0.
*/
void cogl_offscreen_unref (CoglHandle handle);
G_END_DECLS
#endif /* __COGL_OFFSCREEN_H__ */