/****************************************************************************
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** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtGui module of the Qt Toolkit.
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** $QT_BEGIN_LICENSE:LGPL$
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** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
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** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
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** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
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** $QT_END_LICENSE$
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****************************************************************************/

#ifndef QOPENGL_H
#define QOPENGL_H

#ifndef QT_NO_OPENGL

#include <QtCore/qglobal.h>

#if defined(QT_OPENGL_ES_2)
# if defined(Q_OS_MAC)
#  include <OpenGLES/ES2/gl.h>
# else
#  include <GLES2/gl2.h>
# endif

/*
   Some GLES2 implementations (like the one on Harmattan) are missing the
   typedef for GLchar. Work around it here by adding it. The Kkronos headers
   specify GLChar as a typedef to char, so if an implementation already
   provides it, then this doesn't do any harm.
*/
typedef char GLchar;

# include <QtGui/qopengles2ext.h>
# ifndef GL_DOUBLE
#  define GL_DOUBLE GL_FLOAT
# endif
# ifndef GLdouble
typedef GLfloat GLdouble;
# endif
#else
// Mac OSX is a "controlled platform" for OpenGL ABI so we use
// the system provided headers there. Controlled means that the
// headers always match the actual driver implementation so there
// is no possibility of drivers exposing additional functionality
// from the system headers. Also it means that the vendor can
// (and does) make different choices about some OpenGL types. For
// e.g. Apple uses void* for GLhandleARB whereas other platforms
// use unsigned int.
//
// For the "uncontrolled" Windows and Linux platforms we use the
// official Khronos glext.h header. On these platforms this gives
// access to additional functionality the drivers may expose but
// which the system headers do not.
# if defined(Q_OS_MAC)
#  include <OpenGL/gl.h>
#  if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_7
#   define GL_DO_NOT_WARN_IF_MULTI_GL_VERSION_HEADERS_INCLUDED
#   include <OpenGL/gl3.h>
#  endif
#  include <OpenGL/glext.h>
# else
#  if defined(Q_OS_WIN)
#   include <QtCore/qt_windows.h>
#  endif
#  define GL_GLEXT_LEGACY // Prevents GL/gl.h form #including system glext.h
#  include <GL/gl.h>
#  include <QtGui/qopenglext.h>
# endif // Q_OS_MAC
#endif

// Desktops, apart from Mac OS X prior to 10.7 can support OpenGL 3
#if !defined(QT_OPENGL_ES_2)
# if !defined(Q_OS_MAC) || (defined(Q_OS_MAC) && MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_7)
#  define QT_OPENGL_3
# endif
#endif

QT_BEGIN_NAMESPACE


// When all else fails we provide sensible fallbacks - this is needed to
// allow compilation on OS X 10.6
#if !defined(QT_OPENGL_ES_2)

// OS X 10.6 doesn't define these which are needed below
// OS X 10.7 and later defien them in gl3.h
#ifndef APIENTRY
#define APIENTRY
#endif
#ifndef APIENTRYP
#define APIENTRYP APIENTRY *
#endif
#ifndef GLAPI
#define GLAPI extern
#endif


// This block is copied from glext.h and defines the types needed by
// a few extension classes.

#include <stddef.h>
#ifndef GL_VERSION_2_0
/* GL type for program/shader text */
typedef char GLchar;
#endif

#ifndef GL_VERSION_1_5
/* GL types for handling large vertex buffer objects */
typedef ptrdiff_t GLintptr;
typedef ptrdiff_t GLsizeiptr;
#endif

#ifndef GL_ARB_vertex_buffer_object
/* GL types for handling large vertex buffer objects */
typedef ptrdiff_t GLintptrARB;
typedef ptrdiff_t GLsizeiptrARB;
#endif

#ifndef GL_ARB_shader_objects
/* GL types for program/shader text and shader object handles */
typedef char GLcharARB;
typedef unsigned int GLhandleARB;
#endif

/* GL type for "half" precision (s10e5) float data in host memory */
#ifndef GL_ARB_half_float_pixel
typedef unsigned short GLhalfARB;
#endif

#ifndef GL_NV_half_float
typedef unsigned short GLhalfNV;
#endif

#ifndef GLEXT_64_TYPES_DEFINED
/* This code block is duplicated in glxext.h, so must be protected */
#define GLEXT_64_TYPES_DEFINED
/* Define int32_t, int64_t, and uint64_t types for UST/MSC */
/* (as used in the GL_EXT_timer_query extension). */
#if defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L
#include <inttypes.h>
#elif defined(__sun__) || defined(__digital__)
#include <inttypes.h>
#if defined(__STDC__)
#if defined(__arch64__) || defined(_LP64)
typedef long int int64_t;
typedef unsigned long int uint64_t;
#else
typedef long long int int64_t;
typedef unsigned long long int uint64_t;
#endif /* __arch64__ */
#endif /* __STDC__ */
#elif defined( __VMS ) || defined(__sgi)
#include <inttypes.h>
#elif defined(__SCO__) || defined(__USLC__)
#include <stdint.h>
#elif defined(__UNIXOS2__) || defined(__SOL64__)
typedef long int int32_t;
typedef long long int int64_t;
typedef unsigned long long int uint64_t;
#elif defined(_WIN32) && defined(__GNUC__)
#include <stdint.h>
#elif defined(_WIN32)
typedef __int32 int32_t;
typedef __int64 int64_t;
typedef unsigned __int64 uint64_t;
#else
/* Fallback if nothing above works */
#include <inttypes.h>
#endif
#endif

#ifndef GL_EXT_timer_query
typedef int64_t GLint64EXT;
typedef uint64_t GLuint64EXT;
#endif

#ifndef GL_ARB_sync
typedef int64_t GLint64;
typedef uint64_t GLuint64;
typedef struct __GLsync *GLsync;
#endif

#ifndef GL_ARB_cl_event
/* These incomplete types let us declare types compatible with OpenCL's cl_context and cl_event */
struct _cl_context;
struct _cl_event;
#endif

#ifndef GL_ARB_debug_output
typedef void (APIENTRY *GLDEBUGPROCARB)(GLenum source,GLenum type,GLuint id,GLenum severity,GLsizei length,const GLchar *message,GLvoid *userParam);
#endif

#ifndef GL_AMD_debug_output
typedef void (APIENTRY *GLDEBUGPROCAMD)(GLuint id,GLenum category,GLenum severity,GLsizei length,const GLchar *message,GLvoid *userParam);
#endif

#ifndef GL_KHR_debug
typedef void (APIENTRY *GLDEBUGPROC)(GLenum source,GLenum type,GLuint id,GLenum severity,GLsizei length,const GLchar *message,GLvoid *userParam);
#endif

#ifndef GL_NV_vdpau_interop
typedef GLintptr GLvdpauSurfaceNV;
#endif

// End of block copied from glext.h
#endif


// Types that aren't defined in all system's gl.h files.
typedef ptrdiff_t qopengl_GLintptr;
typedef ptrdiff_t qopengl_GLsizeiptr;


#if defined(APIENTRY) && !defined(QOPENGLF_APIENTRY)
#   define QOPENGLF_APIENTRY APIENTRY
#endif

# ifndef QOPENGLF_APIENTRYP
#   ifdef QOPENGLF_APIENTRY
#     define QOPENGLF_APIENTRYP QOPENGLF_APIENTRY *
#   else
#     define QOPENGLF_APIENTRY
#     define QOPENGLF_APIENTRYP *
#   endif
# endif

QT_END_NAMESPACE

#endif // QT_NO_OPENGL

#endif // QOPENGL_H