1 | /**************************************************************************** |
2 | ** |
3 | ** Copyright (C) 2014 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com, author Sean Harmer <sean.harmer@kdab.com> |
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37 | ** |
38 | ****************************************************************************/ |
39 | |
40 | #include "qopenglvertexarrayobject.h" |
41 | |
42 | #include <QtCore/private/qobject_p.h> |
43 | #include <QtCore/qthread.h> |
44 | #include <QtGui/qopenglcontext.h> |
45 | #include <QtGui/qoffscreensurface.h> |
46 | #include <QtGui/qguiapplication.h> |
47 | |
48 | #include <QtGui/qopenglfunctions_3_0.h> |
49 | #include <QtGui/qopenglfunctions_3_2_core.h> |
50 | |
51 | #include <private/qopenglextensions_p.h> |
52 | #include <private/qopenglvertexarrayobject_p.h> |
53 | |
54 | QT_BEGIN_NAMESPACE |
55 | |
56 | class QOpenGLFunctions_3_0; |
57 | class QOpenGLFunctions_3_2_Core; |
58 | |
59 | void qtInitializeVertexArrayObjectHelper(QOpenGLVertexArrayObjectHelper *helper, QOpenGLContext *context) |
60 | { |
61 | Q_ASSERT(helper); |
62 | Q_ASSERT(context); |
63 | |
64 | bool tryARB = true; |
65 | |
66 | if (context->isOpenGLES()) { |
67 | if (context->format().majorVersion() >= 3) { |
68 | QOpenGLExtraFunctionsPrivate * = static_cast<QOpenGLExtensions *>(context->extraFunctions())->d(); |
69 | helper->GenVertexArrays = extra->f.GenVertexArrays; |
70 | helper->DeleteVertexArrays = extra->f.DeleteVertexArrays; |
71 | helper->BindVertexArray = extra->f.BindVertexArray; |
72 | helper->IsVertexArray = extra->f.IsVertexArray; |
73 | tryARB = false; |
74 | } else if (context->hasExtension(QByteArrayLiteral("GL_OES_vertex_array_object" ))) { |
75 | helper->GenVertexArrays = reinterpret_cast<QOpenGLVertexArrayObjectHelper::qt_GenVertexArrays_t>(context->getProcAddress("glGenVertexArraysOES" )); |
76 | helper->DeleteVertexArrays = reinterpret_cast<QOpenGLVertexArrayObjectHelper::qt_DeleteVertexArrays_t>(context->getProcAddress("glDeleteVertexArraysOES" )); |
77 | helper->BindVertexArray = reinterpret_cast<QOpenGLVertexArrayObjectHelper::qt_BindVertexArray_t>(context->getProcAddress("glBindVertexArrayOES" )); |
78 | helper->IsVertexArray = reinterpret_cast<QOpenGLVertexArrayObjectHelper::qt_IsVertexArray_t>(context->getProcAddress("glIsVertexArrayOES" )); |
79 | tryARB = false; |
80 | } |
81 | } else if (context->hasExtension(QByteArrayLiteral("GL_APPLE_vertex_array_object" )) && |
82 | !context->hasExtension(QByteArrayLiteral("GL_ARB_vertex_array_object" ))) { |
83 | helper->GenVertexArrays = reinterpret_cast<QOpenGLVertexArrayObjectHelper::qt_GenVertexArrays_t>(context->getProcAddress("glGenVertexArraysAPPLE" )); |
84 | helper->DeleteVertexArrays = reinterpret_cast<QOpenGLVertexArrayObjectHelper::qt_DeleteVertexArrays_t>(context->getProcAddress("glDeleteVertexArraysAPPLE" )); |
85 | helper->BindVertexArray = reinterpret_cast<QOpenGLVertexArrayObjectHelper::qt_BindVertexArray_t>(context->getProcAddress("glBindVertexArrayAPPLE" )); |
86 | helper->IsVertexArray = reinterpret_cast<QOpenGLVertexArrayObjectHelper::qt_IsVertexArray_t>(context->getProcAddress("glIsVertexArrayAPPLE" )); |
87 | tryARB = false; |
88 | } |
89 | |
90 | if (tryARB && context->hasExtension(QByteArrayLiteral("GL_ARB_vertex_array_object" ))) { |
91 | helper->GenVertexArrays = reinterpret_cast<QOpenGLVertexArrayObjectHelper::qt_GenVertexArrays_t>(context->getProcAddress("glGenVertexArrays" )); |
92 | helper->DeleteVertexArrays = reinterpret_cast<QOpenGLVertexArrayObjectHelper::qt_DeleteVertexArrays_t>(context->getProcAddress("glDeleteVertexArrays" )); |
93 | helper->BindVertexArray = reinterpret_cast<QOpenGLVertexArrayObjectHelper::qt_BindVertexArray_t>(context->getProcAddress("glBindVertexArray" )); |
94 | helper->IsVertexArray = reinterpret_cast<QOpenGLVertexArrayObjectHelper::qt_IsVertexArray_t>(context->getProcAddress("glIsVertexArray" )); |
95 | } |
96 | } |
97 | |
98 | class QOpenGLVertexArrayObjectPrivate : public QObjectPrivate |
99 | { |
100 | public: |
101 | QOpenGLVertexArrayObjectPrivate() |
102 | : vao(0) |
103 | , vaoFuncsType(NotSupported) |
104 | , context(0) |
105 | { |
106 | } |
107 | |
108 | ~QOpenGLVertexArrayObjectPrivate() |
109 | { |
110 | if (vaoFuncsType == ARB || vaoFuncsType == APPLE || vaoFuncsType == OES) |
111 | delete vaoFuncs.helper; |
112 | } |
113 | |
114 | bool create(); |
115 | void destroy(); |
116 | void bind(); |
117 | void release(); |
118 | void _q_contextAboutToBeDestroyed(); |
119 | |
120 | Q_DECLARE_PUBLIC(QOpenGLVertexArrayObject) |
121 | |
122 | GLuint vao; |
123 | |
124 | union { |
125 | QOpenGLFunctions_3_0 *core_3_0; |
126 | QOpenGLFunctions_3_2_Core *core_3_2; |
127 | QOpenGLVertexArrayObjectHelper *helper; |
128 | } vaoFuncs; |
129 | enum { |
130 | NotSupported, |
131 | Core_3_0, |
132 | Core_3_2, |
133 | ARB, |
134 | APPLE, |
135 | OES |
136 | } vaoFuncsType; |
137 | |
138 | QOpenGLContext *context; |
139 | }; |
140 | |
141 | bool QOpenGLVertexArrayObjectPrivate::create() |
142 | { |
143 | if (vao) { |
144 | qWarning("QOpenGLVertexArrayObject::create() VAO is already created" ); |
145 | return false; |
146 | } |
147 | |
148 | Q_Q(QOpenGLVertexArrayObject); |
149 | |
150 | QOpenGLContext *ctx = QOpenGLContext::currentContext(); |
151 | if (!ctx) { |
152 | qWarning("QOpenGLVertexArrayObject::create() requires a valid current OpenGL context" ); |
153 | return false; |
154 | } |
155 | |
156 | //Fail early, if context is the same as ctx, it means we have tried to initialize for this context and failed |
157 | if (ctx == context) |
158 | return false; |
159 | |
160 | context = ctx; |
161 | QObject::connect(context, SIGNAL(aboutToBeDestroyed()), q, SLOT(_q_contextAboutToBeDestroyed())); |
162 | |
163 | if (ctx->isOpenGLES()) { |
164 | if (ctx->format().majorVersion() >= 3 || ctx->hasExtension(QByteArrayLiteral("GL_OES_vertex_array_object" ))) { |
165 | vaoFuncs.helper = new QOpenGLVertexArrayObjectHelper(ctx); |
166 | vaoFuncsType = OES; |
167 | vaoFuncs.helper->glGenVertexArrays(1, &vao); |
168 | } |
169 | } else { |
170 | vaoFuncs.core_3_0 = 0; |
171 | vaoFuncsType = NotSupported; |
172 | QSurfaceFormat format = ctx->format(); |
173 | #ifndef QT_OPENGL_ES_2 |
174 | if (format.version() >= qMakePair<int, int>(3,2)) { |
175 | vaoFuncs.core_3_2 = ctx->versionFunctions<QOpenGLFunctions_3_2_Core>(); |
176 | vaoFuncsType = Core_3_2; |
177 | vaoFuncs.core_3_2->glGenVertexArrays(1, &vao); |
178 | } else if (format.majorVersion() >= 3) { |
179 | vaoFuncs.core_3_0 = ctx->versionFunctions<QOpenGLFunctions_3_0>(); |
180 | vaoFuncsType = Core_3_0; |
181 | vaoFuncs.core_3_0->glGenVertexArrays(1, &vao); |
182 | } else |
183 | #endif |
184 | if (ctx->hasExtension(QByteArrayLiteral("GL_ARB_vertex_array_object" ))) { |
185 | vaoFuncs.helper = new QOpenGLVertexArrayObjectHelper(ctx); |
186 | vaoFuncsType = ARB; |
187 | vaoFuncs.helper->glGenVertexArrays(1, &vao); |
188 | } else if (ctx->hasExtension(QByteArrayLiteral("GL_APPLE_vertex_array_object" ))) { |
189 | vaoFuncs.helper = new QOpenGLVertexArrayObjectHelper(ctx); |
190 | vaoFuncsType = APPLE; |
191 | vaoFuncs.helper->glGenVertexArrays(1, &vao); |
192 | } |
193 | } |
194 | |
195 | return (vao != 0); |
196 | } |
197 | |
198 | void QOpenGLVertexArrayObjectPrivate::destroy() |
199 | { |
200 | Q_Q(QOpenGLVertexArrayObject); |
201 | |
202 | QOpenGLContext *ctx = QOpenGLContext::currentContext(); |
203 | QOpenGLContext *oldContext = 0; |
204 | QSurface *oldContextSurface = 0; |
205 | QScopedPointer<QOffscreenSurface> offscreenSurface; |
206 | if (context && context != ctx) { |
207 | oldContext = ctx; |
208 | oldContextSurface = ctx ? ctx->surface() : 0; |
209 | // Before going through the effort of creating an offscreen surface |
210 | // check that we are on the GUI thread because otherwise many platforms |
211 | // will not able to create that offscreen surface. |
212 | if (QThread::currentThread() != qGuiApp->thread()) { |
213 | ctx = 0; |
214 | } else { |
215 | // Cannot just make the current surface current again with another context. |
216 | // The format may be incompatible and some platforms (iOS) may impose |
217 | // restrictions on using a window with different contexts. Create an |
218 | // offscreen surface (a pbuffer or a hidden window) instead to be safe. |
219 | offscreenSurface.reset(new QOffscreenSurface); |
220 | offscreenSurface->setFormat(context->format()); |
221 | offscreenSurface->create(); |
222 | if (context->makeCurrent(offscreenSurface.data())) { |
223 | ctx = context; |
224 | } else { |
225 | qWarning("QOpenGLVertexArrayObject::destroy() failed to make VAO's context current" ); |
226 | ctx = 0; |
227 | } |
228 | } |
229 | } |
230 | |
231 | if (context) { |
232 | QObject::disconnect(context, SIGNAL(aboutToBeDestroyed()), q, SLOT(_q_contextAboutToBeDestroyed())); |
233 | context = 0; |
234 | } |
235 | |
236 | if (vao && ctx) { |
237 | switch (vaoFuncsType) { |
238 | #ifndef QT_OPENGL_ES_2 |
239 | case Core_3_2: |
240 | vaoFuncs.core_3_2->glDeleteVertexArrays(1, &vao); |
241 | break; |
242 | case Core_3_0: |
243 | vaoFuncs.core_3_0->glDeleteVertexArrays(1, &vao); |
244 | break; |
245 | #endif |
246 | case ARB: |
247 | case APPLE: |
248 | case OES: |
249 | vaoFuncs.helper->glDeleteVertexArrays(1, &vao); |
250 | break; |
251 | default: |
252 | break; |
253 | } |
254 | |
255 | vao = 0; |
256 | } |
257 | |
258 | if (oldContext && oldContextSurface) { |
259 | if (!oldContext->makeCurrent(oldContextSurface)) |
260 | qWarning("QOpenGLVertexArrayObject::destroy() failed to restore current context" ); |
261 | } |
262 | } |
263 | |
264 | /*! |
265 | \internal |
266 | */ |
267 | void QOpenGLVertexArrayObjectPrivate::_q_contextAboutToBeDestroyed() |
268 | { |
269 | destroy(); |
270 | } |
271 | |
272 | void QOpenGLVertexArrayObjectPrivate::bind() |
273 | { |
274 | switch (vaoFuncsType) { |
275 | #ifndef QT_OPENGL_ES_2 |
276 | case Core_3_2: |
277 | vaoFuncs.core_3_2->glBindVertexArray(vao); |
278 | break; |
279 | case Core_3_0: |
280 | vaoFuncs.core_3_0->glBindVertexArray(vao); |
281 | break; |
282 | #endif |
283 | case ARB: |
284 | case APPLE: |
285 | case OES: |
286 | vaoFuncs.helper->glBindVertexArray(vao); |
287 | break; |
288 | default: |
289 | break; |
290 | } |
291 | } |
292 | |
293 | void QOpenGLVertexArrayObjectPrivate::release() |
294 | { |
295 | switch (vaoFuncsType) { |
296 | #ifndef QT_OPENGL_ES_2 |
297 | case Core_3_2: |
298 | vaoFuncs.core_3_2->glBindVertexArray(0); |
299 | break; |
300 | case Core_3_0: |
301 | vaoFuncs.core_3_0->glBindVertexArray(0); |
302 | break; |
303 | #endif |
304 | case ARB: |
305 | case APPLE: |
306 | case OES: |
307 | vaoFuncs.helper->glBindVertexArray(0); |
308 | break; |
309 | default: |
310 | break; |
311 | } |
312 | } |
313 | |
314 | |
315 | /*! |
316 | \class QOpenGLVertexArrayObject |
317 | \brief The QOpenGLVertexArrayObject class wraps an OpenGL Vertex Array Object. |
318 | \inmodule QtGui |
319 | \since 5.1 |
320 | \ingroup painting-3D |
321 | |
322 | A Vertex Array Object (VAO) is an OpenGL container object that encapsulates |
323 | the state needed to specify per-vertex attribute data to the OpenGL pipeline. |
324 | To put it another way, a VAO remembers the states of buffer objects (see |
325 | QOpenGLBuffer) and their associated state (e.g. vertex attribute divisors). |
326 | This allows a very easy and efficient method of switching between OpenGL buffer |
327 | states for rendering different "objects" in a scene. The QOpenGLVertexArrayObject |
328 | class is a thin wrapper around an OpenGL VAO. |
329 | |
330 | For the desktop, VAOs are supported as a core feature in OpenGL 3.0 or newer and by the |
331 | GL_ARB_vertex_array_object for older versions. On OpenGL ES 2, VAOs are provided by |
332 | the optional GL_OES_vertex_array_object extension. You can check the version of |
333 | OpenGL with QOpenGLContext::surfaceFormat() and check for the presence of extensions |
334 | with QOpenGLContext::hasExtension(). |
335 | |
336 | As with the other Qt OpenGL classes, QOpenGLVertexArrayObject has a create() |
337 | function to create the underlying OpenGL object. This is to allow the developer to |
338 | ensure that there is a valid current OpenGL context at the time. |
339 | |
340 | Once you have successfully created a VAO the typical usage pattern is: |
341 | |
342 | \list |
343 | \li In scene initialization function, for each visual object: |
344 | \list |
345 | \li Bind the VAO |
346 | \li Set vertex data state for this visual object (vertices, normals, texture coordinates etc.) |
347 | \li Unbind (release()) the VAO |
348 | \endlist |
349 | \li In render function, for each visual object: |
350 | \list |
351 | \li Bind the VAO (and shader program if needed) |
352 | \li Call a glDraw*() function |
353 | \li Unbind (release()) the VAO |
354 | \endlist |
355 | \endlist |
356 | |
357 | The act of binding the VAO in the render function has the effect of restoring |
358 | all of the vertex data state setup in the initialization phase. In this way we can |
359 | set a great deal of state when setting up a VAO and efficiently switch between |
360 | state sets of objects to be rendered. Using VAOs also allows the OpenGL driver |
361 | to amortise the validation checks of the vertex data. |
362 | |
363 | \note Vertex Array Objects, like all other OpenGL container objects, are specific |
364 | to the context for which they were created and cannot be shared amongst a |
365 | context group. |
366 | |
367 | \sa QOpenGLVertexArrayObject::Binder, QOpenGLBuffer |
368 | */ |
369 | |
370 | /*! |
371 | Creates a QOpenGLVertexArrayObject with the given \a parent. You must call create() |
372 | with a valid OpenGL context before using. |
373 | */ |
374 | QOpenGLVertexArrayObject::QOpenGLVertexArrayObject(QObject* parent) |
375 | : QObject(*new QOpenGLVertexArrayObjectPrivate, parent) |
376 | { |
377 | } |
378 | |
379 | /*! |
380 | \internal |
381 | */ |
382 | QOpenGLVertexArrayObject::QOpenGLVertexArrayObject(QOpenGLVertexArrayObjectPrivate &dd) |
383 | : QObject(dd) |
384 | { |
385 | } |
386 | |
387 | /*! |
388 | Destroys the QOpenGLVertexArrayObject and the underlying OpenGL resource. |
389 | */ |
390 | QOpenGLVertexArrayObject::~QOpenGLVertexArrayObject() |
391 | { |
392 | destroy(); |
393 | } |
394 | |
395 | /*! |
396 | Creates the underlying OpenGL vertex array object. There must be a valid OpenGL context |
397 | that supports vertex array objects current for this function to succeed. |
398 | |
399 | Returns \c true if the OpenGL vertex array object was successfully created. |
400 | |
401 | When the return value is \c false, vertex array object support is not available. This |
402 | is not an error: on systems with OpenGL 2.x or OpenGL ES 2.0 vertex array objects may |
403 | not be supported. The application is free to continue execution in this case, but it |
404 | then has to be prepared to operate in a VAO-less manner too. This means that instead |
405 | of merely calling bind(), the value of isCreated() must be checked and the vertex |
406 | arrays has to be initialized in the traditional way when there is no vertex array |
407 | object present. |
408 | |
409 | \sa isCreated() |
410 | */ |
411 | bool QOpenGLVertexArrayObject::create() |
412 | { |
413 | Q_D(QOpenGLVertexArrayObject); |
414 | return d->create(); |
415 | } |
416 | |
417 | /*! |
418 | Destroys the underlying OpenGL vertex array object. There must be a valid OpenGL context |
419 | that supports vertex array objects current for this function to succeed. |
420 | */ |
421 | void QOpenGLVertexArrayObject::destroy() |
422 | { |
423 | Q_D(QOpenGLVertexArrayObject); |
424 | d->destroy(); |
425 | } |
426 | |
427 | /*! |
428 | Returns \c true is the underlying OpenGL vertex array object has been created. If this |
429 | returns \c true and the associated OpenGL context is current, then you are able to bind() |
430 | this object. |
431 | */ |
432 | bool QOpenGLVertexArrayObject::isCreated() const |
433 | { |
434 | Q_D(const QOpenGLVertexArrayObject); |
435 | return (d->vao != 0); |
436 | } |
437 | |
438 | /*! |
439 | Returns the id of the underlying OpenGL vertex array object. |
440 | */ |
441 | GLuint QOpenGLVertexArrayObject::objectId() const |
442 | { |
443 | Q_D(const QOpenGLVertexArrayObject); |
444 | return d->vao; |
445 | } |
446 | |
447 | /*! |
448 | Binds this vertex array object to the OpenGL binding point. From this point on |
449 | and until release() is called or another vertex array object is bound, any |
450 | modifications made to vertex data state are stored inside this vertex array object. |
451 | |
452 | If another vertex array object is then bound you can later restore the set of |
453 | state associated with this object by calling bind() on this object once again. |
454 | This allows efficient changes between vertex data states in rendering functions. |
455 | */ |
456 | void QOpenGLVertexArrayObject::bind() |
457 | { |
458 | Q_D(QOpenGLVertexArrayObject); |
459 | d->bind(); |
460 | } |
461 | |
462 | /*! |
463 | Unbinds this vertex array object by binding the default vertex array object (id = 0). |
464 | */ |
465 | void QOpenGLVertexArrayObject::release() |
466 | { |
467 | Q_D(QOpenGLVertexArrayObject); |
468 | d->release(); |
469 | } |
470 | |
471 | |
472 | /*! |
473 | \class QOpenGLVertexArrayObject::Binder |
474 | \brief The QOpenGLVertexArrayObject::Binder class is a convenience class to help |
475 | with the binding and releasing of OpenGL Vertex Array Objects. |
476 | \inmodule QtGui |
477 | \reentrant |
478 | \since 5.1 |
479 | \ingroup painting-3D |
480 | |
481 | QOpenGLVertexArrayObject::Binder is a simple convenience class that can be used |
482 | to assist with the binding and releasing of QOpenGLVertexArrayObject instances. |
483 | This class is to QOpenGLVertexArrayObject as QMutexLocker is to QMutex. |
484 | |
485 | This class implements the RAII principle which helps to ensure behavior in |
486 | complex code or in the presence of exceptions. |
487 | |
488 | The constructor of this class accepts a QOpenGLVertexArrayObject (VAO) as an |
489 | argument and attempts to bind the VAO, calling QOpenGLVertexArrayObject::create() |
490 | if necessary. The destructor of this class calls QOpenGLVertexArrayObject::release() |
491 | which unbinds the VAO. |
492 | |
493 | If needed the VAO can be temporarily unbound with the release() function and bound |
494 | once more with rebind(). |
495 | |
496 | \sa QOpenGLVertexArrayObject |
497 | */ |
498 | |
499 | /*! |
500 | \fn QOpenGLVertexArrayObject::Binder::Binder(QOpenGLVertexArrayObject *v) |
501 | |
502 | Creates a QOpenGLVertexArrayObject::Binder object and binds \a v by calling |
503 | QOpenGLVertexArrayObject::bind(). If necessary it first calls |
504 | QOpenGLVertexArrayObject::create(). |
505 | */ |
506 | |
507 | /*! |
508 | \fn QOpenGLVertexArrayObject::Binder::~Binder() |
509 | |
510 | Destroys the QOpenGLVertexArrayObject::Binder and releases the associated vertex array object. |
511 | */ |
512 | |
513 | /*! |
514 | \fn QOpenGLVertexArrayObject::Binder::release() |
515 | |
516 | Can be used to temporarily release the associated vertex array object. |
517 | |
518 | \sa rebind() |
519 | */ |
520 | |
521 | /*! |
522 | \fn QOpenGLVertexArrayObject::Binder::rebind() |
523 | |
524 | Can be used to rebind the associated vertex array object. |
525 | |
526 | \sa release() |
527 | */ |
528 | |
529 | QT_END_NAMESPACE |
530 | |
531 | #include "moc_qopenglvertexarrayobject.cpp" |
532 | |