1/****************************************************************************
2**
3** Copyright (C) 2013 Klaralvdalens Datakonsult AB (KDAB)
4** Copyright (C) 2016 The Qt Company Ltd.
5** Contact: https://www.qt.io/licensing/
6**
7** This file is part of the QtGui module of the Qt Toolkit.
8**
9** $QT_BEGIN_LICENSE:LGPL$
10** Commercial License Usage
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12** accordance with the commercial license agreement provided with the
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18** GNU Lesser General Public License Usage
19** Alternatively, this file may be used under the terms of the GNU Lesser
20** General Public License version 3 as published by the Free Software
21** Foundation and appearing in the file LICENSE.LGPL3 included in the
22** packaging of this file. Please review the following information to
23** ensure the GNU Lesser General Public License version 3 requirements
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26** GNU General Public License Usage
27** Alternatively, this file may be used under the terms of the GNU
28** General Public License version 2.0 or (at your option) the GNU General
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30** Qt Foundation. The licenses are as published by the Free Software
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37** $QT_END_LICENSE$
38**
39**
40** This file was generated by glgen version 0.1
41** Command line was: glgen
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43** glgen is Copyright (C) 2013 Klaralvdalens Datakonsult AB (KDAB)
44**
45** This is an auto-generated file.
46** Do not edit! All changes made to it will be lost.
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48****************************************************************************/
49
50#include "qopenglversionfunctions.h"
51#include "qopenglcontext.h"
52#include "qdebug.h"
53
54QT_BEGIN_NAMESPACE
55
56#define QT_OPENGL_COUNT_FUNCTIONS(ret, name, args) +1
57#define QT_OPENGL_FUNCTION_NAMES(ret, name, args) \
58 "gl"#name"\0"
59#define QT_OPENGL_IMPLEMENT(CLASS, FUNCTIONS) \
60void CLASS::init() \
61{ \
62 const char *names = FUNCTIONS(QT_OPENGL_FUNCTION_NAMES); \
63 const char *name = names; \
64 for (int i = 0; i < FUNCTIONS(QT_OPENGL_COUNT_FUNCTIONS); ++i) { \
65 functions[i] = context->getProcAddress(name); \
66 name += strlen(name) + 1; \
67 } \
68}
69
70QOpenGLVersionFunctionsStorage::QOpenGLVersionFunctionsStorage()
71 : backends(nullptr)
72{
73}
74
75QOpenGLVersionFunctionsStorage::~QOpenGLVersionFunctionsStorage()
76{
77#ifndef QT_OPENGL_ES
78 if (backends) {
79
80 int i = 0;
81
82#define DELETE_BACKEND(X) \
83 if (backends[i] && !--backends[i]->refs) \
84 delete static_cast<QOpenGLFunctions_##X##Backend*>(backends[i]); \
85 ++i;
86
87 QT_OPENGL_VERSIONS(DELETE_BACKEND)
88#undef DELETE_BACKEND
89 delete[] backends;
90 }
91#endif
92}
93
94QOpenGLVersionFunctionsBackend *QOpenGLVersionFunctionsStorage::backend(QOpenGLContext *context, QOpenGLVersionFunctionsBackend::Version v)
95{
96#ifdef QT_OPENGL_ES
97 Q_UNUSED(context);
98 Q_UNUSED(v);
99 return 0;
100#else
101 if (!backends) {
102 backends = new QOpenGLVersionFunctionsBackend *[QOpenGLVersionFunctionsBackend::OpenGLVersionBackendCount];
103 memset(s: backends, c: 0, n: sizeof(QOpenGLVersionFunctionsBackend *)*QOpenGLVersionFunctionsBackend::OpenGLVersionBackendCount);
104 }
105 if (backends[v])
106 return backends[v];
107
108 switch(v) {
109#define VERSION_ENUM(X) QOpenGLVersionFunctionsBackend::OpenGL_##X
110#define CREATE_BACKEND(X) \
111 case VERSION_ENUM(X): \
112 backends[VERSION_ENUM(X)] = new QOpenGLFunctions_##X##Backend(context); \
113 break;
114 QT_OPENGL_VERSIONS(CREATE_BACKEND)
115 case QOpenGLVersionFunctionsBackend::OpenGLVersionBackendCount:
116 Q_UNREACHABLE();
117 }
118 // the storage keeps one ref
119 ++backends[v]->refs;
120 return backends[v];
121#endif
122}
123
124QOpenGLVersionFunctionsBackend *QAbstractOpenGLFunctionsPrivate::functionsBackend(QOpenGLContext *context, QOpenGLVersionFunctionsBackend::Version v)
125{
126 Q_ASSERT(context);
127 QOpenGLVersionFunctionsStorage *storage = context->functionsBackendStorage();
128 return storage->backend(context, v);
129}
130
131void QAbstractOpenGLFunctionsPrivate::insertExternalFunctions(QOpenGLContext *context, QAbstractOpenGLFunctions *f)
132{
133 Q_ASSERT(context);
134 context->insertExternalFunctions(f);
135}
136
137void QAbstractOpenGLFunctionsPrivate::removeExternalFunctions(QOpenGLContext *context, QAbstractOpenGLFunctions *f)
138{
139 Q_ASSERT(context);
140 context->removeExternalFunctions(f);
141}
142
143/*!
144 \class QAbstractOpenGLFunctions
145 \inmodule QtGui
146 \since 5.1
147 \brief The QAbstractOpenGLFunctions class is the base class of a family of
148 classes that expose all functions for each OpenGL version and
149 profile.
150
151 OpenGL implementations on different platforms are able to link to a variable
152 number of OpenGL functions depending upon the OpenGL ABI on that platform.
153 For example, on Microsoft Windows only functions up to those in OpenGL 1.1
154 can be linked to at build time. All other functions must be resolved at
155 runtime. The traditional solution to this has been to use either
156 QOpenGLContext::getProcAddress() or QOpenGLFunctions. The former is tedious
157 and error prone and means dealing directly with function pointers. The
158 latter only exposes those functions common to OpenGL ES 2 and desktop
159 OpenGL. There is however much new OpenGL functionality that is useful when
160 writing real world OpenGL applications.
161
162 Qt now provides a family of classes which all inherit from
163 QAbstractOpenGLFunctions which expose every core OpenGL function by way of a
164 corresponding member function. There is a class for every valid combination
165 of OpenGL version and profile. Each class follows the naming convention:
166 \badcode
167 QOpenGLFunctions_<MAJOR VERSION>_<MINOR VERSION>[_PROFILE]
168 \endcode
169
170 For OpenGL versions 1.0 through to 3.0 there are no profiles, leading to the
171 classes:
172
173 \list
174 \li QOpenGLFunctions_1_0
175 \li QOpenGLFunctions_1_1
176 \li QOpenGLFunctions_1_2
177 \li QOpenGLFunctions_1_3
178 \li QOpenGLFunctions_1_4
179 \li QOpenGLFunctions_1_5
180 \li QOpenGLFunctions_2_0
181 \li QOpenGLFunctions_2_1
182 \li QOpenGLFunctions_3_0
183 \endlist
184
185 where each class inherits from QAbstractOpenGLFunctions.
186
187 OpenGL version 3.1 removed many deprecated functions leading to a much
188 simpler and generic API.
189
190 With OpenGL 3.2 the concept of profiles was introduced. Two profiles are
191 currently defined for OpenGL: Core and Compatibility.
192
193 The Core profile does not include any of the functions that were removed
194 in OpenGL 3.1. The Compatibility profile contains all functions in the
195 Core profile of the same version plus all of the functions that were
196 removed in OpenGL 3.1. In this way the Compatibility profile classes allow
197 use of newer OpenGL functionality but also allows you to keep using your
198 legacy OpenGL code. For new OpenGL code the Core profile should be
199 preferred.
200
201 Please note that some vendors, notably Apple, do not implement the
202 Compatibility profile. Therefore if you wish to target new OpenGL features
203 on \macos then you should ensure that you request a Core profile context via
204 QSurfaceFormat::setProfile().
205
206 Qt provides classes for all version and Core and Compatibility profile
207 combinations. The classes for OpenGL versions 3.1 through to 4.3 are:
208
209 \list
210 \li QOpenGLFunctions_3_1
211 \li QOpenGLFunctions_3_2_Core
212 \li QOpenGLFunctions_3_2_Compatibility
213 \li QOpenGLFunctions_3_3_Core
214 \li QOpenGLFunctions_3_3_Compatibility
215 \li QOpenGLFunctions_4_0_Core
216 \li QOpenGLFunctions_4_0_Compatibility
217 \li QOpenGLFunctions_4_1_Core
218 \li QOpenGLFunctions_4_1_Compatibility
219 \li QOpenGLFunctions_4_2_Core
220 \li QOpenGLFunctions_4_2_Compatibility
221 \li QOpenGLFunctions_4_3_Core
222 \li QOpenGLFunctions_4_3_Compatibility
223 \endlist
224
225 where each class inherits from QAbstractOpenGLFunctions.
226
227 A pointer to an object of the class corresponding to the version and
228 profile of OpenGL in use can be obtained from
229 QOpenGLContext::versionFunctions(). If obtained in this way, note that
230 the QOpenGLContext retains ownership of the object. This is so that only
231 one instance need be created.
232
233 Before calling any of the exposed OpenGL functions you must ensure that the
234 object has resolved the function pointers to the OpenGL functions. This
235 only needs to be done once per instance with initializeOpenGLFunctions().
236 Once initialized, the object can be used to call any OpenGL function for
237 the corresponding version and profile. Note that initializeOpenGLFunctions()
238 can fail in some circumstances so check the return value. Situations in
239 which initialization can fail are if you have a functions object for a version
240 or profile that contains functions that are not part of the context being
241 used to resolve the function pointers.
242
243 If you exclusively use function objects then you will get compile time
244 errors if you attempt to use a function not included in that version and
245 profile. This is obviously a lot easier to debug than undefined behavior
246 at run time.
247
248 \sa QOpenGLContext::versionFunctions()
249*/
250/*!
251 Constructs a QAbstractOpenGLFunctions object.
252*/
253QAbstractOpenGLFunctions::QAbstractOpenGLFunctions()
254 : d_ptr(new QAbstractOpenGLFunctionsPrivate)
255{
256}
257
258/*!
259 Destroys a QAbstractOpenGLFunctions object.
260*/
261QAbstractOpenGLFunctions::~QAbstractOpenGLFunctions()
262{
263 Q_D(QAbstractOpenGLFunctions);
264 if (d->owningContext)
265 d->removeExternalFunctions(context: d->owningContext, f: this);
266 delete d_ptr;
267}
268
269/*! \internal
270 */
271bool QAbstractOpenGLFunctions::initializeOpenGLFunctions()
272{
273 Q_D(QAbstractOpenGLFunctions);
274 d->initialized = true;
275
276 // For a subclass whose instance is not created via
277 // QOpenGLContext::versionFunctions() owningContext is not set. Set it now
278 // and register such instances to the context as external ones. These are
279 // not owned by the context but still need certain cleanup when the context
280 // is destroyed.
281 if (!d->owningContext) {
282 d->owningContext = QOpenGLContext::currentContext();
283 if (d->owningContext)
284 d->insertExternalFunctions(context: d->owningContext, f: this);
285 }
286
287 return true;
288}
289
290/*! \internal
291 */
292bool QAbstractOpenGLFunctions::isInitialized() const
293{
294 Q_D(const QAbstractOpenGLFunctions);
295 return d->initialized;
296}
297
298/*! \internal
299 */
300void QAbstractOpenGLFunctions::setOwningContext(const QOpenGLContext *context)
301{
302 Q_D(QAbstractOpenGLFunctions);
303 d->owningContext = const_cast<QOpenGLContext*>(context);
304}
305
306/*! \internal
307 */
308QOpenGLContext *QAbstractOpenGLFunctions::owningContext() const
309{
310 Q_D(const QAbstractOpenGLFunctions);
311 return d->owningContext;
312}
313
314#if !defined(QT_OPENGL_ES_2)
315
316QT_OPENGL_IMPLEMENT(QOpenGLFunctions_1_0_CoreBackend, QT_OPENGL_1_0_FUNCTIONS)
317QT_OPENGL_IMPLEMENT(QOpenGLFunctions_1_1_CoreBackend, QT_OPENGL_1_1_FUNCTIONS)
318
319QT_OPENGL_IMPLEMENT(QOpenGLFunctions_1_2_CoreBackend, QT_OPENGL_1_2_FUNCTIONS)
320QT_OPENGL_IMPLEMENT(QOpenGLFunctions_1_3_CoreBackend, QT_OPENGL_1_3_FUNCTIONS)
321QT_OPENGL_IMPLEMENT(QOpenGLFunctions_1_4_CoreBackend, QT_OPENGL_1_4_FUNCTIONS)
322QT_OPENGL_IMPLEMENT(QOpenGLFunctions_1_5_CoreBackend, QT_OPENGL_1_5_FUNCTIONS)
323QT_OPENGL_IMPLEMENT(QOpenGLFunctions_2_0_CoreBackend, QT_OPENGL_2_0_FUNCTIONS)
324QT_OPENGL_IMPLEMENT(QOpenGLFunctions_2_1_CoreBackend, QT_OPENGL_2_1_FUNCTIONS)
325QT_OPENGL_IMPLEMENT(QOpenGLFunctions_3_0_CoreBackend, QT_OPENGL_3_0_FUNCTIONS)
326QT_OPENGL_IMPLEMENT(QOpenGLFunctions_3_1_CoreBackend, QT_OPENGL_3_1_FUNCTIONS)
327QT_OPENGL_IMPLEMENT(QOpenGLFunctions_3_2_CoreBackend, QT_OPENGL_3_2_FUNCTIONS)
328QT_OPENGL_IMPLEMENT(QOpenGLFunctions_3_3_CoreBackend, QT_OPENGL_3_3_FUNCTIONS)
329QT_OPENGL_IMPLEMENT(QOpenGLFunctions_4_0_CoreBackend, QT_OPENGL_4_0_FUNCTIONS)
330QT_OPENGL_IMPLEMENT(QOpenGLFunctions_4_1_CoreBackend, QT_OPENGL_4_1_FUNCTIONS)
331QT_OPENGL_IMPLEMENT(QOpenGLFunctions_4_2_CoreBackend, QT_OPENGL_4_2_FUNCTIONS)
332QT_OPENGL_IMPLEMENT(QOpenGLFunctions_4_3_CoreBackend, QT_OPENGL_4_3_FUNCTIONS)
333QT_OPENGL_IMPLEMENT(QOpenGLFunctions_4_4_CoreBackend, QT_OPENGL_4_4_FUNCTIONS)
334QT_OPENGL_IMPLEMENT(QOpenGLFunctions_4_5_CoreBackend, QT_OPENGL_4_5_FUNCTIONS)
335
336QT_OPENGL_IMPLEMENT(QOpenGLFunctions_1_0_DeprecatedBackend, QT_OPENGL_1_0_DEPRECATED_FUNCTIONS)
337QT_OPENGL_IMPLEMENT(QOpenGLFunctions_1_1_DeprecatedBackend, QT_OPENGL_1_1_DEPRECATED_FUNCTIONS)
338
339QT_OPENGL_IMPLEMENT(QOpenGLFunctions_1_2_DeprecatedBackend, QT_OPENGL_1_2_DEPRECATED_FUNCTIONS)
340QT_OPENGL_IMPLEMENT(QOpenGLFunctions_1_3_DeprecatedBackend, QT_OPENGL_1_3_DEPRECATED_FUNCTIONS)
341QT_OPENGL_IMPLEMENT(QOpenGLFunctions_1_4_DeprecatedBackend, QT_OPENGL_1_4_DEPRECATED_FUNCTIONS)
342QT_OPENGL_IMPLEMENT(QOpenGLFunctions_2_0_DeprecatedBackend, QT_OPENGL_2_0_DEPRECATED_FUNCTIONS)
343QT_OPENGL_IMPLEMENT(QOpenGLFunctions_3_0_DeprecatedBackend, QT_OPENGL_3_0_DEPRECATED_FUNCTIONS)
344QT_OPENGL_IMPLEMENT(QOpenGLFunctions_3_3_DeprecatedBackend, QT_OPENGL_3_3_DEPRECATED_FUNCTIONS)
345QT_OPENGL_IMPLEMENT(QOpenGLFunctions_4_5_DeprecatedBackend, QT_OPENGL_4_5_DEPRECATED_FUNCTIONS)
346
347#else
348
349// No backends for OpenGL ES 2
350
351#endif // !QT_OPENGL_ES_2
352
353QT_END_NAMESPACE
354

source code of qtbase/src/gui/opengl/qopenglversionfunctions.cpp