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Buffer objects are cool! This abstracts the buffer API first introduced by GL_ARB_vertex_buffer_object and then extended to other objects. The coglBuffer abstract class is intended to be the base class of all the buffer objects, letting the user map() buffers. If the underlying implementation does not support buffer objects (or only support VBO but not FBO for instance), fallback paths should be provided.
103 lines
3.4 KiB
C
103 lines
3.4 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, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*
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* Authors:
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* Damien Lespiau <damien.lespiau@intel.com>
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*/
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#ifndef __COGL_BUFFER_PRIVATE_H__
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#define __COGL_BUFFER_PRIVATE_H__
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#include <glib.h>
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#include "cogl-handle.h"
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#include "cogl-buffer.h"
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G_BEGIN_DECLS
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#define COGL_BUFFER(buffer) ((CoglBuffer *)(buffer))
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#define COGL_BUFFER_SET_FLAG(buffer, flag) \
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((buffer)->flags |= (COGL_BUFFER_FLAG_ ## flag))
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#define COGL_BUFFER_CLEAR_FLAG(buffer, flag) \
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((buffer)->flags &= ~(COGL_BUFFER_FLAG_ ## flag))
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#define COGL_BUFFER_FLAG_IS_SET(buffer, flag) \
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((buffer)->flags & (COGL_BUFFER_FLAG_ ## flag))
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typedef struct _CoglBuffer CoglBuffer;
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typedef struct _CoglBufferVtable CoglBufferVtable;
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struct _CoglBufferVtable
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{
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guchar * (* map) (CoglBuffer *buffer,
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CoglBufferAccess access);
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void (* unmap) (CoglBuffer *buffer);
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gboolean (* set_data) (CoglBuffer *buffer,
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guint offset,
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const guchar *data,
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guint size);
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};
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typedef enum _CoglBufferFlags
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{
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COGL_BUFFER_FLAG_NONE = 0,
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COGL_BUFFER_FLAG_BUFFER_OBJECT = 1UL << 0, /* real openGL buffer object */
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COGL_BUFFER_FLAG_MAPPED = 1UL << 1
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} CoglBufferFlags;
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struct _CoglBuffer
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{
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CoglHandleObject _parent;
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const CoglBufferVtable *vtable;
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CoglBufferFlags flags;
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GLuint gl_handle; /* OpenGL handle */
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guint size; /* size of the buffer, in bytes */
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CoglBufferUsageHint usage_hint;
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CoglBufferUpdateHint update_hint;
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guchar *data; /* points to the mapped memory when
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* the CoglBuffer is a VBO, PBO, ... or
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* points to allocated memory in the
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* fallback paths */
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};
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void _cogl_buffer_initialize (CoglBuffer *buffer,
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guint size,
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CoglBufferUsageHint usage_hint,
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CoglBufferUpdateHint update_hint);
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void _cogl_buffer_fini (CoglBuffer *buffer);
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void _cogl_buffer_bind (CoglBuffer *buffer,
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GLenum target);
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GLenum _cogl_buffer_access_to_gl_enum (CoglBufferAccess access);
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GLenum _cogl_buffer_hints_to_gl_enum (CoglBufferUsageHint usage_hint,
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CoglBufferUpdateHint update_hint);
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G_END_DECLS
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#endif /* __COGL_BUFFER_PRIVATE_H__ */
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