opengl/qopenglbuffer.cpp

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41 -
42#include <QtGui/qopengl.h> -
43#include <QtGui/private/qopenglcontext_p.h> -
44#include <QtCore/qatomic.h> -
45#include "qopenglbuffer.h" -
46#include <private/qopenglextensions_p.h> -
47 -
48QT_BEGIN_NAMESPACE -
49 -
50/*! -
51 \class QOpenGLBuffer -
52 \brief The QOpenGLBuffer class provides functions for creating and managing OpenGL buffer objects. -
53 \since 5.0 -
54 \ingroup painting-3D -
55 \inmodule QtGui -
56 -
57 Buffer objects are created in the OpenGL server so that the -
58 client application can avoid uploading vertices, indices, -
59 texture image data, etc every time they are needed. -
60 -
61 QOpenGLBuffer objects can be copied around as a reference to the -
62 underlying OpenGL buffer object: -
63 -
64 \code -
65 QOpenGLBuffer buffer1(QOpenGLBuffer::IndexBuffer); -
66 buffer1.create(); -
67 -
68 QOpenGLBuffer buffer2 = buffer1; -
69 \endcode -
70 -
71 QOpenGLBuffer performs a shallow copy when objects are copied in this -
72 manner, but does not implement copy-on-write semantics. The original -
73 object will be affected whenever the copy is modified. -
74*/ -
75 -
76/*! -
77 \enum QOpenGLBuffer::Type -
78 This enum defines the type of OpenGL buffer object to create with QOpenGLBuffer. -
79 -
80 \value VertexBuffer Vertex buffer object for use when specifying -
81 vertex arrays. -
82 \value IndexBuffer Index buffer object for use with \c{glDrawElements()}. -
83 \value PixelPackBuffer Pixel pack buffer object for reading pixel -
84 data from the OpenGL server (for example, with \c{glReadPixels()}). -
85 Not supported under OpenGL/ES. -
86 \value PixelUnpackBuffer Pixel unpack buffer object for writing pixel -
87 data to the OpenGL server (for example, with \c{glTexImage2D()}). -
88 Not supported under OpenGL/ES. -
89*/ -
90 -
91/*! -
92 \enum QOpenGLBuffer::UsagePattern -
93 This enum defines the usage pattern of a QOpenGLBuffer object. -
94 -
95 \value StreamDraw The data will be set once and used a few times -
96 for drawing operations. Under OpenGL/ES 1.1 this is identical -
97 to StaticDraw. -
98 \value StreamRead The data will be set once and used a few times -
99 for reading data back from the OpenGL server. Not supported -
100 under OpenGL/ES. -
101 \value StreamCopy The data will be set once and used a few times -
102 for reading data back from the OpenGL server for use in further -
103 drawing operations. Not supported under OpenGL/ES. -
104 \value StaticDraw The data will be set once and used many times -
105 for drawing operations. -
106 \value StaticRead The data will be set once and used many times -
107 for reading data back from the OpenGL server. Not supported -
108 under OpenGL/ES. -
109 \value StaticCopy The data will be set once and used many times -
110 for reading data back from the OpenGL server for use in further -
111 drawing operations. Not supported under OpenGL/ES. -
112 \value DynamicDraw The data will be modified repeatedly and used -
113 many times for drawing operations. -
114 \value DynamicRead The data will be modified repeatedly and used -
115 many times for reading data back from the OpenGL server. -
116 Not supported under OpenGL/ES. -
117 \value DynamicCopy The data will be modified repeatedly and used -
118 many times for reading data back from the OpenGL server for -
119 use in further drawing operations. Not supported under OpenGL/ES. -
120*/ -
121 -
122/*! -
123 \enum QOpenGLBuffer::Access -
124 This enum defines the access mode for QOpenGLBuffer::map(). -
125 -
126 \value ReadOnly The buffer will be mapped for reading only. -
127 \value WriteOnly The buffer will be mapped for writing only. -
128 \value ReadWrite The buffer will be mapped for reading and writing. -
129*/ -
130 -
131class QOpenGLBufferPrivate -
132{ -
133public: -
134 QOpenGLBufferPrivate(QOpenGLBuffer::Type t) -
135 : ref(1), -
136 type(t), -
137 guard(0), -
138 usagePattern(QOpenGLBuffer::StaticDraw), -
139 actualUsagePattern(QOpenGLBuffer::StaticDraw), -
140 funcs(0) -
141 { -
142 }
never executed: }
0
143 -
144 QAtomicInt ref; -
145 QOpenGLBuffer::Type type; -
146 QOpenGLSharedResourceGuard *guard; -
147 QOpenGLBuffer::UsagePattern usagePattern; -
148 QOpenGLBuffer::UsagePattern actualUsagePattern; -
149 QOpenGLExtensions *funcs; -
150}; -
151 -
152/*! -
153 Constructs a new buffer object of type QOpenGLBuffer::VertexBuffer. -
154 -
155 Note: this constructor just creates the QOpenGLBuffer instance. The actual -
156 buffer object in the OpenGL server is not created until create() is called. -
157 -
158 \sa create() -
159*/ -
160QOpenGLBuffer::QOpenGLBuffer() -
161 : d_ptr(new QOpenGLBufferPrivate(QOpenGLBuffer::VertexBuffer)) -
162{ -
163}
never executed: }
0
164 -
165/*! -
166 Constructs a new buffer object of \a type. -
167 -
168 Note: this constructor just creates the QOpenGLBuffer instance. The actual -
169 buffer object in the OpenGL server is not created until create() is called. -
170 -
171 \sa create() -
172*/ -
173QOpenGLBuffer::QOpenGLBuffer(QOpenGLBuffer::Type type) -
174 : d_ptr(new QOpenGLBufferPrivate(type)) -
175{ -
176}
never executed: }
0
177 -
178/*! -
179 Constructs a shallow copy of \a other. -
180 -
181 Note: QOpenGLBuffer does not implement copy-on-write semantics, -
182 so \a other will be affected whenever the copy is modified. -
183*/ -
184QOpenGLBuffer::QOpenGLBuffer(const QOpenGLBuffer &other) -
185 : d_ptr(other.d_ptr) -
186{ -
187 d_ptr->ref.ref();
never executed (the execution status of this line is deduced): d_ptr->ref.ref();
-
188}
never executed: }
0
189 -
190/*! -
191 Destroys this buffer object, including the storage being -
192 used in the OpenGL server. -
193*/ -
194QOpenGLBuffer::~QOpenGLBuffer() -
195{ -
196 if (!d_ptr->ref.deref()) {
never evaluated: !d_ptr->ref.deref()
0
197 destroy();
never executed (the execution status of this line is deduced): destroy();
-
198 delete d_ptr;
never executed (the execution status of this line is deduced): delete d_ptr;
-
199 }
never executed: }
0
200}
never executed: }
0
201 -
202/*! -
203 Assigns a shallow copy of \a other to this object. -
204 -
205 Note: QOpenGLBuffer does not implement copy-on-write semantics, -
206 so \a other will be affected whenever the copy is modified. -
207*/ -
208QOpenGLBuffer &QOpenGLBuffer::operator=(const QOpenGLBuffer &other) -
209{ -
210 if (d_ptr != other.d_ptr) {
never evaluated: d_ptr != other.d_ptr
0
211 other.d_ptr->ref.ref();
never executed (the execution status of this line is deduced): other.d_ptr->ref.ref();
-
212 if (!d_ptr->ref.deref()) {
never evaluated: !d_ptr->ref.deref()
0
213 destroy();
never executed (the execution status of this line is deduced): destroy();
-
214 delete d_ptr;
never executed (the execution status of this line is deduced): delete d_ptr;
-
215 }
never executed: }
0
216 d_ptr = other.d_ptr;
never executed (the execution status of this line is deduced): d_ptr = other.d_ptr;
-
217 }
never executed: }
0
218 return *this;
never executed: return *this;
0
219} -
220 -
221/*! -
222 Returns the type of buffer represented by this object. -
223*/ -
224QOpenGLBuffer::Type QOpenGLBuffer::type() const -
225{ -
226 Q_D(const QOpenGLBuffer);
never executed (the execution status of this line is deduced): const QOpenGLBufferPrivate * const d = d_func();
-
227 return d->type;
never executed: return d->type;
0
228} -
229 -
230/*! -
231 Returns the usage pattern for this buffer object. -
232 The default value is StaticDraw. -
233 -
234 \sa setUsagePattern() -
235*/ -
236QOpenGLBuffer::UsagePattern QOpenGLBuffer::usagePattern() const -
237{ -
238 Q_D(const QOpenGLBuffer);
never executed (the execution status of this line is deduced): const QOpenGLBufferPrivate * const d = d_func();
-
239 return d->usagePattern;
never executed: return d->usagePattern;
0
240} -
241 -
242/*! -
243 Sets the usage pattern for this buffer object to \a value. -
244 This function must be called before allocate() or write(). -
245 -
246 \sa usagePattern(), allocate(), write() -
247*/ -
248void QOpenGLBuffer::setUsagePattern(QOpenGLBuffer::UsagePattern value) -
249{ -
250 Q_D(QOpenGLBuffer);
never executed (the execution status of this line is deduced): QOpenGLBufferPrivate * const d = d_func();
-
251 d->usagePattern = d->actualUsagePattern = value;
never executed (the execution status of this line is deduced): d->usagePattern = d->actualUsagePattern = value;
-
252}
never executed: }
0
253 -
254namespace { -
255 void freeBufferFunc(QOpenGLFunctions *funcs, GLuint id) -
256 { -
257 funcs->glDeleteBuffers(1, &id);
never executed (the execution status of this line is deduced): funcs->glDeleteBuffers(1, &id);
-
258 }
never executed: }
0
259} -
260 -
261/*! -
262 Creates the buffer object in the OpenGL server. Returns true if -
263 the object was created; false otherwise. -
264 -
265 This function must be called with a current QOpenGLContext. -
266 The buffer will be bound to and can only be used in -
267 that context (or any other context that is shared with it). -
268 -
269 This function will return false if the OpenGL implementation -
270 does not support buffers, or there is no current QOpenGLContext. -
271 -
272 \sa isCreated(), allocate(), write(), destroy() -
273*/ -
274bool QOpenGLBuffer::create() -
275{ -
276 Q_D(QOpenGLBuffer);
never executed (the execution status of this line is deduced): QOpenGLBufferPrivate * const d = d_func();
-
277 if (d->guard && d->guard->id())
never evaluated: d->guard
never evaluated: d->guard->id()
0
278 return true;
never executed: return true;
0
279 QOpenGLContext *ctx = QOpenGLContext::currentContext();
never executed (the execution status of this line is deduced): QOpenGLContext *ctx = QOpenGLContext::currentContext();
-
280 if (ctx) {
never evaluated: ctx
0
281 delete d->funcs;
never executed (the execution status of this line is deduced): delete d->funcs;
-
282 d->funcs = new QOpenGLExtensions(ctx);
never executed (the execution status of this line is deduced): d->funcs = new QOpenGLExtensions(ctx);
-
283 GLuint bufferId = 0;
never executed (the execution status of this line is deduced): GLuint bufferId = 0;
-
284 d->funcs->glGenBuffers(1, &bufferId);
never executed (the execution status of this line is deduced): d->funcs->glGenBuffers(1, &bufferId);
-
285 if (bufferId) {
never evaluated: bufferId
0
286 if (d->guard)
never evaluated: d->guard
0
287 d->guard->free();
never executed: d->guard->free();
0
288 -
289 d->guard = new QOpenGLSharedResourceGuard(ctx, bufferId, freeBufferFunc);
never executed (the execution status of this line is deduced): d->guard = new QOpenGLSharedResourceGuard(ctx, bufferId, freeBufferFunc);
-
290 return true;
never executed: return true;
0
291 } -
292 }
never executed: }
0
293 return false;
never executed: return false;
0
294} -
295 -
296/*! -
297 Returns true if this buffer has been created; false otherwise. -
298 -
299 \sa create(), destroy() -
300*/ -
301bool QOpenGLBuffer::isCreated() const -
302{ -
303 Q_D(const QOpenGLBuffer);
never executed (the execution status of this line is deduced): const QOpenGLBufferPrivate * const d = d_func();
-
304 return d->guard && d->guard->id();
never executed: return d->guard && d->guard->id();
0
305} -
306 -
307/*! -
308 Destroys this buffer object, including the storage being -
309 used in the OpenGL server. All references to the buffer will -
310 become invalid. -
311*/ -
312void QOpenGLBuffer::destroy() -
313{ -
314 Q_D(QOpenGLBuffer);
never executed (the execution status of this line is deduced): QOpenGLBufferPrivate * const d = d_func();
-
315 if (d->guard) {
never evaluated: d->guard
0
316 d->guard->free();
never executed (the execution status of this line is deduced): d->guard->free();
-
317 d->guard = 0;
never executed (the execution status of this line is deduced): d->guard = 0;
-
318 }
never executed: }
0
319}
never executed: }
0
320 -
321/*! -
322 Reads the \a count bytes in this buffer starting at \a offset -
323 into \a data. Returns true on success; false if reading from -
324 the buffer is not supported. Buffer reading is not supported -
325 under OpenGL/ES. -
326 -
327 It is assumed that this buffer has been bound to the current context. -
328 -
329 \sa write(), bind() -
330*/ -
331bool QOpenGLBuffer::read(int offset, void *data, int count) -
332{ -
333#if !defined(QT_OPENGL_ES) -
334 Q_D(QOpenGLBuffer);
never executed (the execution status of this line is deduced): QOpenGLBufferPrivate * const d = d_func();
-
335 if (!d->funcs->hasOpenGLFeature(QOpenGLFunctions::Buffers) || !d->guard->id())
never evaluated: !d->funcs->hasOpenGLFeature(QOpenGLFunctions::Buffers)
never evaluated: !d->guard->id()
0
336 return false;
never executed: return false;
0
337 while (glGetError() != GL_NO_ERROR) ; // Clear error state.
never executed: ;
never evaluated: glGetError() != 0x0
0
338 d->funcs->glGetBufferSubData(d->type, offset, count, data);
never executed (the execution status of this line is deduced): d->funcs->glGetBufferSubData(d->type, offset, count, data);
-
339 return glGetError() == GL_NO_ERROR;
never executed: return glGetError() == 0x0;
0
340#else -
341 Q_UNUSED(offset); -
342 Q_UNUSED(data); -
343 Q_UNUSED(count); -
344 return false; -
345#endif -
346} -
347 -
348/*! -
349 Replaces the \a count bytes of this buffer starting at \a offset -
350 with the contents of \a data. Any other bytes in the buffer -
351 will be left unmodified. -
352 -
353 It is assumed that create() has been called on this buffer and that -
354 it has been bound to the current context. -
355 -
356 \sa create(), read(), allocate() -
357*/ -
358void QOpenGLBuffer::write(int offset, const void *data, int count) -
359{ -
360#ifndef QT_NO_DEBUG -
361 if (!isCreated()) -
362 qWarning("QOpenGLBuffer::allocate(): buffer not created"); -
363#endif -
364 Q_D(QOpenGLBuffer);
never executed (the execution status of this line is deduced): QOpenGLBufferPrivate * const d = d_func();
-
365 if (d->guard && d->guard->id())
never evaluated: d->guard
never evaluated: d->guard->id()
0
366 d->funcs->glBufferSubData(d->type, offset, count, data);
never executed: d->funcs->glBufferSubData(d->type, offset, count, data);
0
367}
never executed: }
0
368 -
369/*! -
370 Allocates \a count bytes of space to the buffer, initialized to -
371 the contents of \a data. Any previous contents will be removed. -
372 -
373 It is assumed that create() has been called on this buffer and that -
374 it has been bound to the current context. -
375 -
376 \sa create(), read(), write() -
377*/ -
378void QOpenGLBuffer::allocate(const void *data, int count) -
379{ -
380#ifndef QT_NO_DEBUG -
381 if (!isCreated()) -
382 qWarning("QOpenGLBuffer::allocate(): buffer not created"); -
383#endif -
384 Q_D(QOpenGLBuffer);
never executed (the execution status of this line is deduced): QOpenGLBufferPrivate * const d = d_func();
-
385 if (d->guard && d->guard->id())
never evaluated: d->guard
never evaluated: d->guard->id()
0
386 d->funcs->glBufferData(d->type, count, data, d->actualUsagePattern);
never executed: d->funcs->glBufferData(d->type, count, data, d->actualUsagePattern);
0
387}
never executed: }
0
388 -
389/*! -
390 \fn void QOpenGLBuffer::allocate(int count) -
391 \overload -
392 -
393 Allocates \a count bytes of space to the buffer. Any previous -
394 contents will be removed. -
395 -
396 It is assumed that create() has been called on this buffer and that -
397 it has been bound to the current context. -
398 -
399 \sa create(), write() -
400*/ -
401 -
402/*! -
403 Binds the buffer associated with this object to the current -
404 OpenGL context. Returns false if binding was not possible, usually because -
405 type() is not supported on this OpenGL implementation. -
406 -
407 The buffer must be bound to the same QOpenGLContext current when create() -
408 was called, or to another QOpenGLContext that is sharing with it. -
409 Otherwise, false will be returned from this function. -
410 -
411 \sa release(), create() -
412*/ -
413bool QOpenGLBuffer::bind() -
414{ -
415#ifndef QT_NO_DEBUG -
416 if (!isCreated()) -
417 qWarning("QOpenGLBuffer::bind(): buffer not created"); -
418#endif -
419 Q_D(const QOpenGLBuffer);
never executed (the execution status of this line is deduced): const QOpenGLBufferPrivate * const d = d_func();
-
420 GLuint bufferId = d->guard ? d->guard->id() : 0;
never evaluated: d->guard
0
421 if (bufferId) {
never evaluated: bufferId
0
422 if (d->guard->group() != QOpenGLContextGroup::currentContextGroup()) {
never evaluated: d->guard->group() != QOpenGLContextGroup::currentContextGroup()
0
423#ifndef QT_NO_DEBUG -
424 qWarning("QOpenGLBuffer::bind: buffer is not valid in the current context"); -
425#endif -
426 return false;
never executed: return false;
0
427 } -
428 d->funcs->glBindBuffer(d->type, bufferId);
never executed (the execution status of this line is deduced): d->funcs->glBindBuffer(d->type, bufferId);
-
429 return true;
never executed: return true;
0
430 } else { -
431 return false;
never executed: return false;
0
432 } -
433} -
434 -
435/*! -
436 Releases the buffer associated with this object from the -
437 current OpenGL context. -
438 -
439 This function must be called with the same QOpenGLContext current -
440 as when bind() was called on the buffer. -
441 -
442 \sa bind() -
443*/ -
444void QOpenGLBuffer::release() -
445{ -
446#ifndef QT_NO_DEBUG -
447 if (!isCreated()) -
448 qWarning("QOpenGLBuffer::release(): buffer not created"); -
449#endif -
450 Q_D(const QOpenGLBuffer);
never executed (the execution status of this line is deduced): const QOpenGLBufferPrivate * const d = d_func();
-
451 if (d->guard && d->guard->id())
never evaluated: d->guard
never evaluated: d->guard->id()
0
452 d->funcs->glBindBuffer(d->type, 0);
never executed: d->funcs->glBindBuffer(d->type, 0);
0
453}
never executed: }
0
454 -
455/*! -
456 Releases the buffer associated with \a type in the current -
457 QOpenGLContext. -
458 -
459 This function is a direct call to \c{glBindBuffer(type, 0)} -
460 for use when the caller does not know which QOpenGLBuffer has -
461 been bound to the context but wants to make sure that it -
462 is released. -
463 -
464 \code -
465 QOpenGLBuffer::release(QOpenGLBuffer::VertexBuffer); -
466 \endcode -
467*/ -
468void QOpenGLBuffer::release(QOpenGLBuffer::Type type) -
469{ -
470 QOpenGLContext *ctx = QOpenGLContext::currentContext();
never executed (the execution status of this line is deduced): QOpenGLContext *ctx = QOpenGLContext::currentContext();
-
471 if (ctx)
never evaluated: ctx
0
472 ctx->functions()->glBindBuffer(GLenum(type), 0);
never executed: ctx->functions()->glBindBuffer(GLenum(type), 0);
0
473}
never executed: }
0
474 -
475/*! -
476 Returns the OpenGL identifier associated with this buffer; zero if -
477 the buffer has not been created. -
478 -
479 \sa isCreated() -
480*/ -
481GLuint QOpenGLBuffer::bufferId() const -
482{ -
483 Q_D(const QOpenGLBuffer);
never executed (the execution status of this line is deduced): const QOpenGLBufferPrivate * const d = d_func();
-
484 return d->guard ? d->guard->id() : 0;
never executed: return d->guard ? d->guard->id() : 0;
0
485} -
486 -
487/*! -
488 Returns the size of the data in this buffer, for reading operations. -
489 Returns -1 if fetching the buffer size is not supported, or the -
490 buffer has not been created. -
491 -
492 It is assumed that this buffer has been bound to the current context. -
493 -
494 \sa isCreated(), bind() -
495*/ -
496int QOpenGLBuffer::size() const -
497{ -
498 Q_D(const QOpenGLBuffer);
never executed (the execution status of this line is deduced): const QOpenGLBufferPrivate * const d = d_func();
-
499 if (!d->guard || !d->guard->id())
never evaluated: !d->guard
never evaluated: !d->guard->id()
0
500 return -1;
never executed: return -1;
0
501 GLint value = -1;
never executed (the execution status of this line is deduced): GLint value = -1;
-
502 d->funcs->glGetBufferParameteriv(d->type, GL_BUFFER_SIZE, &value);
never executed (the execution status of this line is deduced): d->funcs->glGetBufferParameteriv(d->type, 0x8764, &value);
-
503 return value;
never executed: return value;
0
504} -
505 -
506/*! -
507 Maps the contents of this buffer into the application's memory -
508 space and returns a pointer to it. Returns null if memory -
509 mapping is not possible. The \a access parameter indicates the -
510 type of access to be performed. -
511 -
512 It is assumed that create() has been called on this buffer and that -
513 it has been bound to the current context. -
514 -
515 This function is only supported under OpenGL/ES if the -
516 \c{GL_OES_mapbuffer} extension is present. -
517 -
518 \sa unmap(), create(), bind() -
519*/ -
520void *QOpenGLBuffer::map(QOpenGLBuffer::Access access) -
521{ -
522 Q_D(QOpenGLBuffer);
never executed (the execution status of this line is deduced): QOpenGLBufferPrivate * const d = d_func();
-
523#ifndef QT_NO_DEBUG -
524 if (!isCreated()) -
525 qWarning("QOpenGLBuffer::map(): buffer not created"); -
526#endif -
527 if (!d->guard || !d->guard->id())
never evaluated: !d->guard
never evaluated: !d->guard->id()
0
528 return 0;
never executed: return 0;
0
529 return d->funcs->glMapBuffer(d->type, access);
never executed: return d->funcs->glMapBuffer(d->type, access);
0
530} -
531 -
532/*! -
533 Unmaps the buffer after it was mapped into the application's -
534 memory space with a previous call to map(). Returns true if -
535 the unmap succeeded; false otherwise. -
536 -
537 It is assumed that this buffer has been bound to the current context, -
538 and that it was previously mapped with map(). -
539 -
540 This function is only supported under OpenGL/ES if the -
541 \c{GL_OES_mapbuffer} extension is present. -
542 -
543 \sa map() -
544*/ -
545bool QOpenGLBuffer::unmap() -
546{ -
547 Q_D(QOpenGLBuffer);
never executed (the execution status of this line is deduced): QOpenGLBufferPrivate * const d = d_func();
-
548#ifndef QT_NO_DEBUG -
549 if (!isCreated()) -
550 qWarning("QOpenGLBuffer::unmap(): buffer not created"); -
551#endif -
552 if (!d->guard || !d->guard->id())
never evaluated: !d->guard
never evaluated: !d->guard->id()
0
553 return false;
never executed: return false;
0
554 return d->funcs->glUnmapBuffer(d->type) == GL_TRUE;
never executed: return d->funcs->glUnmapBuffer(d->type) == 0x1;
0
555} -
556 -
557QT_END_NAMESPACE -
558 -
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