source: trunk/src/opengl/qgl_p.h@ 1001

Last change on this file since 1001 was 846, checked in by Dmitry A. Kuminov, 14 years ago

trunk: Merged in qt 4.7.2 sources from branches/vendor/nokia/qt.
File size: 22.7 KB
Line 
1/****************************************************************************
2**
3** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
4** All rights reserved.
5** Contact: Nokia Corporation (qt-info@nokia.com)
6**
7** This file is part of the QtOpenGL module of the Qt Toolkit.
8**
9** $QT_BEGIN_LICENSE:LGPL$
10** Commercial Usage
11** Licensees holding valid Qt Commercial licenses may use this file in
12** accordance with the Qt Commercial License Agreement provided with the
13** Software or, alternatively, in accordance with the terms contained in
14** a written agreement between you and Nokia.
15**
16** GNU Lesser General Public License Usage
17** Alternatively, this file may be used under the terms of the GNU Lesser
18** General Public License version 2.1 as published by the Free Software
19** Foundation and appearing in the file LICENSE.LGPL included in the
20** packaging of this file. Please review the following information to
21** ensure the GNU Lesser General Public License version 2.1 requirements
22** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
23**
24** In addition, as a special exception, Nokia gives you certain additional
25** rights. These rights are described in the Nokia Qt LGPL Exception
26** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
27**
28** GNU General Public License Usage
29** Alternatively, this file may be used under the terms of the GNU
30** General Public License version 3.0 as published by the Free Software
31** Foundation and appearing in the file LICENSE.GPL included in the
32** packaging of this file. Please review the following information to
33** ensure the GNU General Public License version 3.0 requirements will be
34** met: http://www.gnu.org/copyleft/gpl.html.
35**
36** If you have questions regarding the use of this file, please contact
37** Nokia at qt-info@nokia.com.
38** $QT_END_LICENSE$
39**
40****************************************************************************/
41
42#ifndef QGL_P_H
43#define QGL_P_H
44
45//
46// W A R N I N G
47// -------------
48//
49// This file is not part of the Qt API. It exists for the convenience
50// of the QGLWidget class. This header file may change from
51// version to version without notice, or even be removed.
52//
53// We mean it.
54//
55
56#include "QtOpenGL/qgl.h"
57#include "QtOpenGL/qglcolormap.h"
58#include "QtCore/qmap.h"
59#include "QtCore/qthread.h"
60#include "QtCore/qthreadstorage.h"
61#include "QtCore/qhash.h"
62#include "QtCore/qatomic.h"
63#include "private/qwidget_p.h"
64#include "qcache.h"
65#include "qglpaintdevice_p.h"
66
67#ifndef QT_NO_EGL
68#include <QtGui/private/qegl_p.h>
69#endif
70
71QT_BEGIN_NAMESPACE
72
73class QGLContext;
74class QGLOverlayWidget;
75class QPixmap;
76class QPixmapFilter;
77#ifdef Q_WS_MAC
78# ifdef qDebug
79# define old_qDebug qDebug
80# undef qDebug
81# endif
82QT_BEGIN_INCLUDE_NAMESPACE
83#ifndef QT_MAC_USE_COCOA
84# include <AGL/agl.h>
85#endif
86QT_END_INCLUDE_NAMESPACE
87# ifdef old_qDebug
88# undef qDebug
89# define qDebug QT_NO_QDEBUG_MACRO
90# undef old_qDebug
91# endif
92class QMacWindowChangeEvent;
93#endif
94
95#ifdef Q_WS_QWS
96class QWSGLWindowSurface;
97#endif
98
99#ifndef QT_NO_EGL
100class QEglContext;
101#endif
102
103QT_BEGIN_INCLUDE_NAMESPACE
104#include <QtOpenGL/private/qglextensions_p.h>
105QT_END_INCLUDE_NAMESPACE
106
107class QGLFormatPrivate
108{
109public:
110 QGLFormatPrivate()
111 : ref(1)
112 {
113 opts = QGL::DoubleBuffer | QGL::DepthBuffer | QGL::Rgba | QGL::DirectRendering
114 | QGL::StencilBuffer | QGL::DeprecatedFunctions;
115 pln = 0;
116 depthSize = accumSize = stencilSize = redSize = greenSize = blueSize = alphaSize = -1;
117 numSamples = -1;
118 swapInterval = -1;
119 majorVersion = 1;
120 minorVersion = 0;
121 profile = QGLFormat::NoProfile;
122 }
123 QGLFormatPrivate(const QGLFormatPrivate *other)
124 : ref(1),
125 opts(other->opts),
126 pln(other->pln),
127 depthSize(other->depthSize),
128 accumSize(other->accumSize),
129 stencilSize(other->stencilSize),
130 redSize(other->redSize),
131 greenSize(other->greenSize),
132 blueSize(other->blueSize),
133 alphaSize(other->alphaSize),
134 numSamples(other->numSamples),
135 swapInterval(other->swapInterval),
136 majorVersion(other->majorVersion),
137 minorVersion(other->minorVersion),
138 profile(other->profile)
139 {
140 }
141 QAtomicInt ref;
142 QGL::FormatOptions opts;
143 int pln;
144 int depthSize;
145 int accumSize;
146 int stencilSize;
147 int redSize;
148 int greenSize;
149 int blueSize;
150 int alphaSize;
151 int numSamples;
152 int swapInterval;
153 int majorVersion;
154 int minorVersion;
155 QGLFormat::OpenGLContextProfile profile;
156};
157
158class QGLWidgetPrivate : public QWidgetPrivate
159{
160 Q_DECLARE_PUBLIC(QGLWidget)
161public:
162 QGLWidgetPrivate() : QWidgetPrivate()
163 , disable_clear_on_painter_begin(false)
164#ifdef Q_WS_QWS
165 , wsurf(0)
166#endif
167#if defined(Q_WS_X11) && !defined(QT_NO_EGL)
168 , eglSurfaceWindowId(0)
169#endif
170#if defined(Q_OS_SYMBIAN)
171 , eglSurfaceWindowId(0)
172#endif
173 {
174 isGLWidget = 1;
175 }
176
177 ~QGLWidgetPrivate() {}
178
179 void init(QGLContext *context, const QGLWidget* shareWidget);
180 void initContext(QGLContext *context, const QGLWidget* shareWidget);
181 bool renderCxPm(QPixmap *pixmap);
182 void cleanupColormaps();
183 void aboutToDestroy() {
184 if (glcx)
185 glcx->reset();
186 }
187
188 QGLContext *glcx;
189 QGLWidgetGLPaintDevice glDevice;
190 bool autoSwap;
191
192 QGLColormap cmap;
193#ifndef QT_OPENGL_ES
194 QMap<QString, int> displayListCache;
195#endif
196
197 bool disable_clear_on_painter_begin;
198
199#if defined(Q_WS_WIN)
200 void updateColormap();
201 QGLContext *olcx;
202#elif defined(Q_WS_X11)
203 QGLOverlayWidget *olw;
204#ifndef QT_NO_EGL
205 void recreateEglSurface();
206 WId eglSurfaceWindowId;
207#endif
208#elif defined(Q_WS_MAC)
209 QGLContext *olcx;
210 void updatePaintDevice();
211#elif defined(Q_WS_QWS)
212 QWSGLWindowSurface *wsurf;
213#endif
214#ifdef Q_OS_SYMBIAN
215 void recreateEglSurface();
216 WId eglSurfaceWindowId;
217#endif
218};
219
220class QGLContextResource;
221class QGLSharedResourceGuard;
222
223typedef QHash<QString, GLuint> QGLDDSCache;
224
225// QGLContextPrivate has the responsibility of creating context groups.
226// QGLContextPrivate maintains the reference counter and destroys
227// context groups when needed.
228class QGLContextGroup
229{
230public:
231 ~QGLContextGroup();
232
233 QGLExtensionFuncs &extensionFuncs() {return m_extensionFuncs;}
234 const QGLContext *context() const {return m_context;}
235 bool isSharing() const { return m_shares.size() >= 2; }
236 QList<const QGLContext *> shares() const { return m_shares; }
237
238 void addGuard(QGLSharedResourceGuard *guard);
239 void removeGuard(QGLSharedResourceGuard *guard);
240
241 static void addShare(const QGLContext *context, const QGLContext *share);
242 static void removeShare(const QGLContext *context);
243private:
244 QGLContextGroup(const QGLContext *context);
245
246 QGLExtensionFuncs m_extensionFuncs;
247 const QGLContext *m_context; // context group's representative
248 QList<const QGLContext *> m_shares;
249 QHash<QGLContextResource *, void *> m_resources;
250 QGLSharedResourceGuard *m_guards; // double-linked list of active guards.
251 QAtomicInt m_refs;
252 QGLDDSCache m_dds_cache;
253
254 void cleanupResources(const QGLContext *ctx);
255
256 friend class QGLContext;
257 friend class QGLContextPrivate;
258 friend class QGLContextResource;
259};
260
261// Get the context that resources for "ctx" will transfer to once
262// "ctx" is destroyed. Returns null if nothing is sharing with ctx.
263Q_OPENGL_EXPORT const QGLContext *qt_gl_transfer_context(const QGLContext *);
264
265// GL extension definitions
266class QGLExtensions {
267public:
268 enum Extension {
269 TextureRectangle = 0x00000001,
270 SampleBuffers = 0x00000002,
271 GenerateMipmap = 0x00000004,
272 TextureCompression = 0x00000008,
273 FragmentProgram = 0x00000010,
274 MirroredRepeat = 0x00000020,
275 FramebufferObject = 0x00000040,
276 StencilTwoSide = 0x00000080,
277 StencilWrap = 0x00000100,
278 PackedDepthStencil = 0x00000200,
279 NVFloatBuffer = 0x00000400,
280 PixelBufferObject = 0x00000800,
281 FramebufferBlit = 0x00001000,
282 NPOTTextures = 0x00002000,
283 BGRATextureFormat = 0x00004000,
284 DDSTextureCompression = 0x00008000,
285 ETC1TextureCompression = 0x00010000,
286 PVRTCTextureCompression = 0x00020000,
287 FragmentShader = 0x00040000,
288 ElementIndexUint = 0x00080000,
289 Depth24 = 0x00100000
290 };
291 Q_DECLARE_FLAGS(Extensions, Extension)
292
293 static Extensions glExtensions();
294 static Extensions currentContextExtensions();
295};
296
297/*
298 QGLTemporaryContext - the main objective of this class is to have a way of
299 creating a GL context and making it current, without going via QGLWidget
300 and friends. At certain points during GL initialization we need a current
301 context in order decide what GL features are available, and to resolve GL
302 extensions. Having a light-weight way of creating such a context saves
303 initial application startup time, and it doesn't wind up creating recursive
304 conflicts.
305 The class currently uses a private d pointer to hide the platform specific
306 types. This could possibly been done inline with #ifdef'ery, but it causes
307 major headaches on e.g. X11 due to namespace pollution.
308*/
309class QGLTemporaryContextPrivate;
310class QGLTemporaryContext {
311public:
312 QGLTemporaryContext(bool directRendering = true, QWidget *parent = 0);
313 ~QGLTemporaryContext();
314
315private:
316 QScopedPointer<QGLTemporaryContextPrivate> d;
317};
318
319class QGLTexture;
320class QGLTextureDestroyer;
321
322// This probably needs to grow to GL_MAX_VERTEX_ATTRIBS, but 3 is ok for now as that's
323// all the GL2 engine uses:
324#define QT_GL_VERTEX_ARRAY_TRACKED_COUNT 3
325
326class QGLContextPrivate
327{
328 Q_DECLARE_PUBLIC(QGLContext)
329public:
330 explicit QGLContextPrivate(QGLContext *context);
331 ~QGLContextPrivate();
332 QGLTexture *bindTexture(const QImage &image, GLenum target, GLint format,
333 QGLContext::BindOptions options);
334 QGLTexture *bindTexture(const QImage &image, GLenum target, GLint format, const qint64 key,
335 QGLContext::BindOptions options);
336 QGLTexture *bindTexture(const QPixmap &pixmap, GLenum target, GLint format,
337 QGLContext::BindOptions options);
338 QGLTexture *textureCacheLookup(const qint64 key, GLenum target);
339 void init(QPaintDevice *dev, const QGLFormat &format);
340 QImage convertToGLFormat(const QImage &image, bool force_premul, GLenum texture_format);
341 int maxTextureSize();
342
343 void cleanup();
344
345 void setVertexAttribArrayEnabled(int arrayIndex, bool enabled = true);
346 void syncGlState(); // Makes sure the GL context's state is what we think it is
347 void swapRegion(const QRegion &region);
348
349#if defined(Q_WS_WIN)
350 void updateFormatVersion();
351#endif
352
353#if defined(Q_WS_WIN)
354 HGLRC rc;
355 HDC dc;
356 WId win;
357 int pixelFormatId;
358 QGLCmap* cmap;
359 HBITMAP hbitmap;
360 HDC hbitmap_hdc;
361#endif
362#ifndef QT_NO_EGL
363 uint ownsEglContext : 1;
364 QEglContext *eglContext;
365 EGLSurface eglSurface;
366 void destroyEglSurfaceForDevice();
367 EGLSurface eglSurfaceForDevice() const;
368#elif defined(Q_WS_X11) || defined(Q_WS_MAC)
369 void* cx;
370#endif
371#if defined(Q_WS_X11) || defined(Q_WS_MAC)
372 void* vi;
373#endif
374#if defined(Q_WS_X11)
375 void* pbuf;
376 quint32 gpm;
377 int screen;
378 QHash<QPixmapData*, QPixmap> boundPixmaps;
379 QGLTexture *bindTextureFromNativePixmap(QPixmap*, const qint64 key,
380 QGLContext::BindOptions options);
381 static void destroyGlSurfaceForPixmap(QPixmapData*);
382 static void unbindPixmapFromTexture(QPixmapData*);
383#endif
384#if defined(Q_WS_MAC)
385 bool update;
386 void *tryFormat(const QGLFormat &format);
387 void clearDrawable();
388#endif
389 QGLFormat glFormat;
390 QGLFormat reqFormat;
391 GLuint fbo;
392
393 uint valid : 1;
394 uint sharing : 1;
395 uint initDone : 1;
396 uint crWin : 1;
397 uint internal_context : 1;
398 uint version_flags_cached : 1;
399 uint extension_flags_cached : 1;
400
401 // workarounds for driver/hw bugs on different platforms
402 uint workaround_needsFullClearOnEveryFrame : 1;
403 uint workaround_brokenFBOReadBack : 1;
404 uint workaround_brokenTexSubImage : 1;
405 uint workaroundsCached : 1;
406
407 uint workaround_brokenTextureFromPixmap : 1;
408 uint workaround_brokenTextureFromPixmap_init : 1;
409
410 QPaintDevice *paintDevice;
411 QColor transpColor;
412 QGLContext *q_ptr;
413 QGLFormat::OpenGLVersionFlags version_flags;
414 QGLExtensions::Extensions extension_flags;
415
416 QGLContextGroup *group;
417 GLint max_texture_size;
418
419 GLuint current_fbo;
420 GLuint default_fbo;
421 QPaintEngine *active_engine;
422 QGLTextureDestroyer *texture_destroyer;
423
424 bool vertexAttributeArraysEnabledState[QT_GL_VERTEX_ARRAY_TRACKED_COUNT];
425
426 static inline QGLContextGroup *contextGroup(const QGLContext *ctx) { return ctx->d_ptr->group; }
427
428#ifdef Q_WS_WIN
429 static inline QGLExtensionFuncs& extensionFuncs(const QGLContext *ctx) { return ctx->d_ptr->group->extensionFuncs(); }
430#endif
431
432#if defined(Q_WS_X11) || defined(Q_WS_MAC) || defined(Q_WS_QWS) || defined(Q_OS_SYMBIAN)
433 static QGLExtensionFuncs qt_extensionFuncs;
434 static Q_OPENGL_EXPORT QGLExtensionFuncs& extensionFuncs(const QGLContext *);
435#endif
436
437 static void setCurrentContext(QGLContext *context);
438};
439
440Q_DECLARE_OPERATORS_FOR_FLAGS(QGLExtensions::Extensions)
441
442// Temporarily make a context current if not already current or
443// shared with the current contex. The previous context is made
444// current when the object goes out of scope.
445class Q_OPENGL_EXPORT QGLShareContextScope
446{
447public:
448 QGLShareContextScope(const QGLContext *ctx)
449 : m_oldContext(0)
450 {
451 QGLContext *currentContext = const_cast<QGLContext *>(QGLContext::currentContext());
452 if (currentContext != ctx && !QGLContext::areSharing(ctx, currentContext)) {
453 m_oldContext = currentContext;
454 m_ctx = const_cast<QGLContext *>(ctx);
455 m_ctx->makeCurrent();
456 } else {
457 m_ctx = currentContext;
458 }
459 }
460
461 operator QGLContext *()
462 {
463 return m_ctx;
464 }
465
466 QGLContext *operator->()
467 {
468 return m_ctx;
469 }
470
471 ~QGLShareContextScope()
472 {
473 if (m_oldContext)
474 m_oldContext->makeCurrent();
475 }
476
477private:
478 QGLContext *m_oldContext;
479 QGLContext *m_ctx;
480};
481
482class QGLTextureDestroyer : public QObject
483{
484 Q_OBJECT
485public:
486 QGLTextureDestroyer() : QObject() {
487 qRegisterMetaType<GLuint>("GLuint");
488 connect(this, SIGNAL(freeTexture(QGLContext *, QPixmapData *, GLuint)),
489 this, SLOT(freeTexture_slot(QGLContext *, QPixmapData *, GLuint)));
490 }
491 void emitFreeTexture(QGLContext *context, QPixmapData *boundPixmap, GLuint id) {
492 emit freeTexture(context, boundPixmap, id);
493 }
494
495Q_SIGNALS:
496 void freeTexture(QGLContext *context, QPixmapData *boundPixmap, GLuint id);
497
498private slots:
499 void freeTexture_slot(QGLContext *context, QPixmapData *boundPixmap, GLuint id) {
500#if defined(Q_WS_X11)
501 if (boundPixmap) {
502 QGLContext *oldContext = const_cast<QGLContext *>(QGLContext::currentContext());
503 context->makeCurrent();
504 // Although glXReleaseTexImage is a glX call, it must be called while there
505 // is a current context - the context the pixmap was bound to a texture in.
506 // Otherwise the release doesn't do anything and you get BadDrawable errors
507 // when you come to delete the context.
508 QGLContextPrivate::unbindPixmapFromTexture(boundPixmap);
509 glDeleteTextures(1, &id);
510 if (oldContext)
511 oldContext->makeCurrent();
512 return;
513 }
514#endif
515 QGLShareContextScope scope(context);
516 glDeleteTextures(1, &id);
517 }
518};
519
520// ### make QGLContext a QObject in 5.0 and remove the proxy stuff
521class Q_OPENGL_EXPORT QGLSignalProxy : public QObject
522{
523 Q_OBJECT
524public:
525 void emitAboutToDestroyContext(const QGLContext *context) {
526 emit aboutToDestroyContext(context);
527 }
528 static QGLSignalProxy *instance();
529Q_SIGNALS:
530 void aboutToDestroyContext(const QGLContext *context);
531};
532
533class QGLTexture {
534public:
535 QGLTexture(QGLContext *ctx = 0, GLuint tx_id = 0, GLenum tx_target = GL_TEXTURE_2D,
536 QGLContext::BindOptions opt = QGLContext::DefaultBindOption)
537 : context(ctx),
538 id(tx_id),
539 target(tx_target),
540 options(opt)
541#if defined(Q_WS_X11)
542 , boundPixmap(0)
543#endif
544 {}
545
546 ~QGLTexture() {
547 if (options & QGLContext::MemoryManagedBindOption) {
548 Q_ASSERT(context);
549#if !defined(Q_WS_X11)
550 QPixmapData *boundPixmap = 0;
551#endif
552 context->d_ptr->texture_destroyer->emitFreeTexture(context, boundPixmap, id);
553 }
554 }
555
556 QGLContext *context;
557 GLuint id;
558 GLenum target;
559
560 QGLContext::BindOptions options;
561
562#if defined(Q_WS_X11)
563 QPixmapData* boundPixmap;
564#endif
565
566 bool canBindCompressedTexture
567 (const char *buf, int len, const char *format, bool *hasAlpha);
568 QSize bindCompressedTexture
569 (const QString& fileName, const char *format = 0);
570 QSize bindCompressedTexture
571 (const char *buf, int len, const char *format = 0);
572 QSize bindCompressedTextureDDS(const char *buf, int len);
573 QSize bindCompressedTexturePVR(const char *buf, int len);
574};
575
576struct QGLTextureCacheKey {
577 qint64 key;
578 QGLContextGroup *group;
579};
580
581inline bool operator==(const QGLTextureCacheKey &a, const QGLTextureCacheKey &b)
582{
583 return a.key == b.key && a.group == b.group;
584}
585
586inline uint qHash(const QGLTextureCacheKey &key)
587{
588 return qHash(key.key) ^ qHash(key.group);
589}
590
591
592class Q_AUTOTEST_EXPORT QGLTextureCache {
593public:
594 QGLTextureCache();
595 ~QGLTextureCache();
596
597 void insert(QGLContext *ctx, qint64 key, QGLTexture *texture, int cost);
598 void remove(qint64 key);
599 inline int size();
600 inline void setMaxCost(int newMax);
601 inline int maxCost();
602 inline QGLTexture* getTexture(QGLContext *ctx, qint64 key);
603
604 bool remove(QGLContext *ctx, GLuint textureId);
605 void removeContextTextures(QGLContext *ctx);
606 static QGLTextureCache *instance();
607 static void cleanupTexturesForCacheKey(qint64 cacheKey);
608 static void cleanupTexturesForPixampData(QPixmapData* pixmap);
609 static void cleanupBeforePixmapDestruction(QPixmapData* pixmap);
610
611private:
612 QCache<QGLTextureCacheKey, QGLTexture> m_cache;
613 QReadWriteLock m_lock;
614};
615
616int QGLTextureCache::size() {
617 QReadLocker locker(&m_lock);
618 return m_cache.size();
619}
620
621void QGLTextureCache::setMaxCost(int newMax)
622{
623 QWriteLocker locker(&m_lock);
624 m_cache.setMaxCost(newMax);
625}
626
627int QGLTextureCache::maxCost()
628{
629 QReadLocker locker(&m_lock);
630 return m_cache.maxCost();
631}
632
633QGLTexture* QGLTextureCache::getTexture(QGLContext *ctx, qint64 key)
634{
635 QReadLocker locker(&m_lock);
636 const QGLTextureCacheKey cacheKey = {key, QGLContextPrivate::contextGroup(ctx)};
637 return m_cache.object(cacheKey);
638}
639
640extern Q_OPENGL_EXPORT QPaintEngine* qt_qgl_paint_engine();
641
642bool qt_gl_preferGL2Engine();
643
644inline GLenum qt_gl_preferredTextureFormat()
645{
646 return (QGLExtensions::glExtensions() & QGLExtensions::BGRATextureFormat) && QSysInfo::ByteOrder == QSysInfo::LittleEndian
647 ? GL_BGRA : GL_RGBA;
648}
649
650inline GLenum qt_gl_preferredTextureTarget()
651{
652#if defined(QT_OPENGL_ES_2)
653 return GL_TEXTURE_2D;
654#else
655 return (QGLExtensions::glExtensions() & QGLExtensions::TextureRectangle)
656 && !qt_gl_preferGL2Engine()
657 ? GL_TEXTURE_RECTANGLE_NV
658 : GL_TEXTURE_2D;
659#endif
660}
661
662// One resource per group of shared contexts.
663class Q_OPENGL_EXPORT QGLContextResource
664{
665public:
666 typedef void (*FreeFunc)(void *);
667 QGLContextResource(FreeFunc f);
668 ~QGLContextResource();
669 // Set resource 'value' for 'key' and all its shared contexts.
670 void insert(const QGLContext *key, void *value);
671 // Return resource for 'key' or a shared context.
672 void *value(const QGLContext *key);
673 // Cleanup 'value' in response to a context group being destroyed.
674 void cleanup(const QGLContext *ctx, void *value);
675private:
676 FreeFunc free;
677 QAtomicInt active;
678};
679
680// Put a guard around a GL object identifier and its context.
681// When the context goes away, a shared context will be used
682// in its place. If there are no more shared contexts, then
683// the identifier is returned as zero - it is assumed that the
684// context destruction cleaned up the identifier in this case.
685class Q_OPENGL_EXPORT QGLSharedResourceGuard
686{
687public:
688 QGLSharedResourceGuard(const QGLContext *context)
689 : m_group(0), m_id(0), m_next(0), m_prev(0)
690 {
691 setContext(context);
692 }
693 QGLSharedResourceGuard(const QGLContext *context, GLuint id)
694 : m_group(0), m_id(id), m_next(0), m_prev(0)
695 {
696 setContext(context);
697 }
698 ~QGLSharedResourceGuard();
699
700 const QGLContext *context() const
701 {
702 return m_group ? m_group->context() : 0;
703 }
704
705 void setContext(const QGLContext *context);
706
707 GLuint id() const
708 {
709 return m_id;
710 }
711
712 void setId(GLuint id)
713 {
714 m_id = id;
715 }
716
717private:
718 QGLContextGroup *m_group;
719 GLuint m_id;
720 QGLSharedResourceGuard *m_next;
721 QGLSharedResourceGuard *m_prev;
722
723 friend class QGLContextGroup;
724};
725
726
727// This class can be used to match GL extensions without doing any mallocs. The
728// class assumes that the GL extension string ends with a space character,
729// which it should do on all conformant platforms. Create the object and pass
730// in a pointer to the extension string, then call match() on each extension
731// that should be matched. The match() function takes the extension name
732// *without* the terminating space character as input.
733
734class QGLExtensionMatcher
735{
736public:
737 QGLExtensionMatcher(const char *str)
738 : gl_extensions(str), gl_extensions_length(qstrlen(str))
739 {}
740
741 bool match(const char *str) {
742 int str_length = qstrlen(str);
743 const char *extensions = gl_extensions;
744 int extensions_length = gl_extensions_length;
745
746 while (1) {
747 // the total length that needs to be matched is the str_length +
748 // the space character that terminates the extension name
749 if (extensions_length < str_length + 1)
750 return false;
751 if (qstrncmp(extensions, str, str_length) == 0 && extensions[str_length] == ' ')
752 return true;
753
754 int split_pos = 0;
755 while (split_pos < extensions_length && extensions[split_pos] != ' ')
756 ++split_pos;
757 ++split_pos; // added for the terminating space character
758 extensions += split_pos;
759 extensions_length -= split_pos;
760 }
761 return false;
762 }
763
764private:
765 const char *gl_extensions;
766 int gl_extensions_length;
767};
768
769QT_END_NAMESPACE
770
771#endif // QGL_P_H
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