/******************************************************************************

QtAV: Media play library based on Qt and FFmpeg

Copyright (C) 2012-2014 Wang Bin <[email protected]>

* This file is part of QtAV

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 2.1 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

******************************************************************************/

#ifndef QTAV_OPENGLHELPER_H

#define QTAV_OPENGLHELPER_H

#include <qglobal.h>

#if QT_VERSION >= QT_VERSION_CHECK(5, 0, 0)

#include <QtGui/QOpenGLContext>

#include <QtGui/QOpenGLFunctions>

#else

#include <qgl.h>

#endif

//GL_BGRA is available in OpenGL >= 1.2

#ifndef GL_BGRA

#ifndef GL_BGRA_EXT

#if defined QT_OPENGL_ES_2

#include <GLES2/gl2ext.h>

//#include <GLES/glext.h> //maemo 5 define there

#elif defined QT_OPENGL_ES

#include <GLES/glext.h>

#else

#include <GL/glext.h> //GL_BGRA_EXT for OpenGL<=1.1 //TODO Apple include <OpenGL/xxx>

#endif

#endif //GL_BGRA_EXT

//TODO: glPixelStorei(GL_PACK_SWAP_BYTES, ) to swap rgba?

#ifndef GL_BGRA //it may be defined in glext.h

#ifdef GL_BGRA_EXT

#define GL_BGRA GL_BGRA_EXT

#endif //GL_BGRA_EXT

#ifdef GL_BGR_EXT

#define GL_BGR GL_BGR_EXT

#endif //GL_BGR_EXT

#endif //GL_BGRA

#endif //GL_BGRA

#ifndef GL_BGRA

#define GL_BGRA 0x80E1

#endif

#ifndef GL_BGR

#define GL_BGR 0x80E0

#endif

#include "QtAV/VideoFormat.h"

namespace QtAV {

namespace OpenGLHelper {

void glActiveTexture(GLenum texture);

bool videoFormatToGL(const VideoFormat& fmt, GLint* internal_format, GLenum* data_format, GLenum* data_type);

int bytesOfGLFormat(GLenum format, GLenum dataType = GL_UNSIGNED_BYTE);

GLint GetGLInternalFormat(GLint data_format, int bpp);

} //namespace OpenGLHelper

} //namespace QtAV

#endif // QTAV_OPENGLHELPER_H