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* Post-merge fixesAlexandru Croitor2020-01-304-0/+75
| | | | | Change-Id: I6acd29103f6cc550544e7422328d97ea0e2dcafb Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
* Merge remote-tracking branch 'origin/dev' into wip/cmakeAlexandru Croitor2020-01-297-0/+443
|\ | | | | | | | | | | | | | | | | | | Conflicts: src/corelib/Qt5CoreConfigExtras.cmake.in src/corelib/Qt5CoreMacros.cmake src/dbus/Qt5DBusConfigExtras.cmake.in src/widgets/Qt5WidgetsConfigExtras.cmake.in Change-Id: Ib782f3b177c38b2cce83beebe15be9c0baa578f7
| * Move QOpenGLPaintEngine and related classes from QtGui to QtOpenGLJohan Klokkhammer Helsing2020-01-227-0/+443
| | | | | | | | | | | | | | | | | | Also moves the openglwindow test to the opengl folder, as it makes use of these classes. Task-number: QTBUG-74409 Change-Id: Id9f0013cedcc8bd1e87122c005641d7298525045 Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>
* | Post Merge FixesLeander Beernaert2020-01-2419-28/+50
| | | | | | | | | | Change-Id: I1e06c01b76b119c3f23b6e6ecbaae8df719b70ce Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>
* | Merge remote-tracking branch 'origin/dev' into merge-devLeander Beernaert2020-01-2410-9/+14
|\| | | | | | | Change-Id: I31b761cfd5ea01373c60d02a5da8c33398d34739
| * Move QOpenGLWindow from QtGui to QtOpenGLJohan Klokkhammer Helsing2020-01-153-0/+5
| | | | | | | | | | | | Task-number: QTBUG-74409 Change-Id: If7d27cdfa2c6cd5b167887ad77b9cfe413cb106a Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>
| * Move QOpenGLWidget from QtWidgets to QtOpenGLJohan Klokkhammer Helsing2019-12-126-6/+6
| | | | | | | | | | | | Task-number: QTBUG-74409 Change-Id: I98a4f8a9e1d439bfdc24eb2910385273cedecd29 Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>
| * Merge remote-tracking branch 'origin/5.14' into 5.15Qt Forward Merge Bot2019-11-081-3/+3
| |\ | | | | | | | | | Change-Id: I963b5f48b5d6f3500ca379fbd7f1a4290b570175
| | * Merge remote-tracking branch 'origin/5.13' into 5.14Qt Forward Merge Bot2019-11-061-3/+3
| | |\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Conflicts: .qmake.conf mkspecs/features/mac/default_post.prf src/corelib/tools/qsimd_p.h src/platformsupport/fontdatabases/mac/qcoretextfontdatabase.mm util/qfloat16-tables/gen_qfloat16_tables.cpp Change-Id: If48fa8a3bc3c983706b609a6d3822cb67c1352a4
| | | * Fix computegles31 example crashing on Pi4Paolo Angelelli2019-10-291-3/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Due to work group size configured for desktop GL. Change-Id: Id62cf297e280e04aecba748cf41b62c64ed9a0b2 Done-with: Andrey Yaromenok <ayaromenok@gmail.com> Fixes: QTBUG-79374 Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>
* | | | Merge remote-tracking branch 'origin/dev' into wip/cmakeSimon Hausmann2019-10-171-2/+2
|\| | | | | | | | | | | | | | | Change-Id: Ia1da879a7bd8f71a649661a1844144dd67d60b3a
| * | | Merge remote-tracking branch 'origin/5.14' into 5.15Qt Forward Merge Bot2019-10-161-2/+2
| |\| | | | | | | | | | | | | | Change-Id: Ifd83db69416230175ddc3161f640b612755018fc
| | * | Prepare for deprecating the QDesktopWidgetSona Kurazyan2019-10-151-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | QDesktopWidget is marked as obsolete in docs, but it is not yet completely deprecated, some of its methods are still in use. Replace uses of the following methods marked as obsolete: - QDesktopWidget::screenNumber(QWidget*) -> QWidget::screen() - QDesktopWidget::screenGeometry(QWidget*) -> QWidget::screen()->geometry() - QDesktopWidget::availableGeometry(QWidget*) -> QWidget::screen()->availableGeometry() Task-number: QTBUG-76491 Change-Id: I2cca30f2b4caa6e6848e8190e09f959d2c272f33 Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
* | | | Merge remote-tracking branch 'origin/dev' into wip/cmakeAlexandru Croitor2019-10-1423-193/+111
|\| | | | | | | | | | | | | | | Change-Id: I4a78428a8ea273b6960792e3b8043f816fa37fcf
| * | | Cleanup QtOpenGL examplesChristian Ehrlicher2019-09-3023-193/+111
| |/ / | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Cleanup the OpenGL examples - use nullptr (clang-tidy) - use member-initialization - avoid redundant checks for != nullptr when deleting a pointer Change-Id: I3e4702690ed79e71c3e952d51ceef83b907b45b7 Reviewed-by: Edward Welbourne <edward.welbourne@qt.io> Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>
* / / cmake: add examples/openglFrederik Gladhorn2019-10-0721-0/+809
|/ / | | | | | | | | | | | | Fixes: QTBUG-78164 Change-Id: Iccc8bb1354d2362c950de17a6c00e00f95272967 Reviewed-by: Simon Hausmann <simon.hausmann@qt.io> Reviewed-by: Qt CMake Build Bot
* | QOpenGLWindow example: use std::unique_ptr instead of QScopedPointerMarc Mutz2019-07-252-8/+14
| | | | | | | | | | | | | | | | | | | | | | | | QScopedPointer is scheduled for deprecation, and can't decide whether it wants to be a scoped, or a unique pointer. The use of a unique_ptr members requires that the destructor be out-of-line, since the payload classes are only forward-declared in the header file. Change-Id: Id0dcdde52cb3adc30d3051d2eed1d24c76154921 Reviewed-by: Edward Welbourne <edward.welbourne@qt.io>
* | Remove usages of deprecated APIs of qtbase/guiSona Kurazyan2019-07-132-4/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - Replaced the usages of deprecated APIs by corresponding alternatives in the library code and documentation. - Modified the tests to make them build when deprecated APIs disabled: * Made the the parts of the tests testing the deprecated APIs to be compiled conditionally, only when the corresponding methods are enabled. * If the test-case tests only the deprecated API, but not the corresponding replacement, added tests for the replacement. Change-Id: Ic38245015377fc0c8127eb5458c184ffd4b450f1 Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>
* | Convert uses of QTime as a timer to QElapsedTimerEdward Welbourne2019-06-141-2/+2
| | | | | | | | | | | | | | | | Change-Id: I2297f61efa5adf9ea5194c7f3ff68574cbcf452c Reviewed-by: Friedemann Kleint <Friedemann.Kleint@qt.io>
* | ThreadedOpenGL example: use std::unique_ptr instead of QScopedPointerMarc Mutz2019-05-151-2/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | There's talk that QScopedPointer may be deprecated. Don't use it in examples anymore. Change-Id: I05a486c2a86fcc7015a9c21ed0ce9682b0c24034 Reviewed-by: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>
* | examples: port away from Java-style iteratorsMarc Mutz2019-05-232-10/+3
| | | | | | | | | | | | | | | | | | | | | | There's no reason to use them here, the Mutable is misleading in a few instances, ranged-for is much simpler, and more future-proof. Change-Id: Ifd5eaae95bbaa0b4cf0f435e6cfee6d778817b44 Reviewed-by: David Faure <david.faure@kdab.com>
* | Merge remote-tracking branch 'origin/5.13' into devLiang Qi2019-05-151-3/+3
|\| | | | | | | | | | | | | | | | | Conflicts: src/corelib/global/qfloat16.cpp src/corelib/global/qfloat16.h src/plugins/platforms/windows/qwindowswindow.cpp Change-Id: I0938aaa6a9771f55e48c95ed29f6f5291431b947
| * Merge remote-tracking branch 'origin/5.12' into 5.13Qt Forward Merge Bot2019-05-121-3/+3
| |\ | | | | | | | | | Change-Id: I0c00ffe0eabebc919f22d6faa4bf958b288e8fd9
| | * hellogles3: Request core profile contextLaszlo Agocs2019-05-111-3/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | ...instead of compatibility, in order to play nice with systems that have no compatibility profile support (macOS). Instancing needs OpenGL 3.x so sticking with 2.x contexts is not an option. The example looks fully compatible with core profile so its functionality should not change. Change-Id: If0d554a6208973aa8a4fb86757e246d170cd0e71 Fixes: QTBUG-75680 Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
* | | Deprecate conversion functions between QList and QSetLars Knoll2019-05-071-1/+1
|/ / | | | | | | | | | | | | | | | | | | Users should use range constructors instead to do the conversion. Keep conversion methods between QList and QVector as these will turn into a no-op in Qt 6, whereas forcing people to use range constructors would lead to deep copies of the data. Change-Id: Id9fc9e4d007044e019826da523e8418857c91283 Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
* / Examples: cleanup foreach usageChristian Ehrlicher2019-02-024-6/+6
|/ | | | | | | Replace deprecated foreach macro with range-based for loop Change-Id: If919ba1d1d4acddfc1c5460ce7aebf8c49e3ac38 Reviewed-by: Paul Wicking <paul.wicking@qt.io>
* Use requestUpdate instead of timer in a few GL examplesTor Arne Vestbø2019-01-224-10/+24
| | | | | Change-Id: I235ad367fe693c86ef5a0844fde0573371b284db Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>
* Merge remote-tracking branch 'origin/5.11' into 5.12Qt Forward Merge Bot2018-09-302-2/+4
|\ | | | | | | Change-Id: Iaa438d14357be1bf75bb645cb8d3245947c055b8
| * Modernize the "filesystemwatcher" featureLiang Qi2018-09-272-2/+4
| | | | | | | | | | | | Change-Id: If030b56ad97e047d89d442629262b4839df306d4 Reviewed-by: Edward Welbourne <edward.welbourne@qt.io> Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>
* | Merge remote-tracking branch 'origin/5.11' into devLiang Qi2018-07-024-1/+48
|\| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Conflicts: src/plugins/platforms/cocoa/qnsview.mm src/plugins/platforms/cocoa/qnsview_dragging.mm src/plugins/platforms/ios/qiosinputcontext.mm src/plugins/platforms/xcb/qxcbconnection.cpp src/plugins/platforms/xcb/qxcbconnection_xi2.cpp src/plugins/platforms/xcb/qxcbwindow.cpp src/tools/androiddeployqt/main.cpp Was moved from qttools into qtbase in 5.11. So re-apply 32398e4d here. tests/auto/corelib/global/qlogging/test/test.pro tests/auto/corelib/global/qlogging/tst_qlogging.cpp tests/auto/corelib/io/qfile/tst_qfile.cpp tests/auto/corelib/kernel/qtimer/tst_qtimer.cpp tests/auto/corelib/thread/qthreadstorage/test/test.pro tests/auto/widgets/itemviews/qheaderview/tst_qheaderview.cpp tests/auto/widgets/kernel/qapplication/test/test.pro Done-with: Gatis Paeglis <gatis.paeglis@qt.io> Done-with: Mårten Nordheim <marten.nordheim@qt.io> Done-with: Oliver Wolff <oliver.wolff@qt.io> Change-Id: Id970486c5315a1718c540f00deb2633533e8fc7b
| * Doc: Add Hello GLES3 examplePaul Wicking2018-06-264-1/+48
| | | | | | | | | | | | Task-number: QTBUG-67109 Change-Id: I55135264a63b78502b300de723a25b3f363af58b Reviewed-by: Topi Reiniö <topi.reinio@qt.io>
* | Spice up QOpenGLWindow exampleTor Arne Vestbø2018-06-151-10/+5
| | | | | | | | | | | | | | | | | | | | By drawing the same gradient for the triangle as in the rasterwindow example. We also set a default geometry and show the window without forcing it to become maximized. Change-Id: I05f9138d08f9c5d3e30eec362a3a1cd63d72753e Reviewed-by: Eirik Aavitsland <eirik.aavitsland@qt.io> Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
* | Fix typo in contextinfo exampleMichal Klocek2018-06-151-1/+1
|/ | | | | Change-Id: I4d788c9880ca4d52aab58a5abc13b8b91838b66e Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>
* Merge remote-tracking branch 'origin/5.9' into 5.11Liang Qi2018-02-141-2/+2
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Conflicts: .qmake.conf src/corelib/animation/qvariantanimation.cpp src/corelib/global/qglobal.cpp src/corelib/global/qlogging.cpp src/corelib/io/qprocess_win.cpp src/corelib/json/qjsonarray.cpp src/corelib/tools/qsimd_p.h src/corelib/tools/qtimezoneprivate_p.h src/corelib/xml/qxmlstream_p.h src/gui/kernel/qsimpledrag.cpp src/gui/kernel/qsimpledrag_p.h src/plugins/generic/generic.pro src/plugins/platforms/cocoa/qcocoamenu.mm src/widgets/styles/qmacstyle_mac.mm tests/auto/concurrent/qtconcurrentmap/BLACKLIST tests/auto/corelib/io/qfileinfo/tst_qfileinfo.cpp tests/auto/corelib/tools/qdatetime/tst_qdatetime.cpp tests/auto/gui/kernel/qwindow/BLACKLIST tests/auto/widgets/dialogs/qmessagebox/BLACKLIST Change-Id: I508d686cf20f7f8cc6a7119b9bc7c3bbb505c58e
| * hellogles3 example: Fix start-up crash when using dynamic GLFriedemann Kleint2018-01-261-2/+2
| | | | | | | | | | | | | | | | | | Move the instantiation of QGuiApplication to the top since it is required by QOpenGLContext::openGLModuleType(). Task-number: QTBUG-55671 Change-Id: I506cee193fe2ba48400851588a8ef079848bc2f4 Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>
* | Merge remote-tracking branch 'origin/5.10' into devLiang Qi2018-01-201-0/+1
|\ \ | | | | | | | | | | | | | | | | | | Conflicts: tests/auto/widgets/itemviews/qtreeview/tst_qtreeview.cpp Change-Id: If089d5010d15c33b3c1f13912d4386207456c1a9
| * | qtlite: Skip building examples when configured with no-feature-itemviewsRainer Keller2018-01-121-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | Compiling the default examples should be possible without compile errors. Task-number: QTBUG-53141 Change-Id: I73d8787241291ae6230861a89b38e91d900fede0 Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@qt.io> Reviewed-by: Ulf Hermann <ulf.hermann@qt.io>
* | | Merge remote-tracking branch 'origin/5.10' into devLiang Qi2017-11-236-23/+30
|\| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Conflicts: src/network/access/qhttp2protocolhandler_p.h src/network/kernel/kernel.pri src/network/ssl/qsslkey_qt.cpp src/plugins/platforms/cocoa/qcocoascreen.mm src/plugins/platforms/windows/accessible/iaccessible2.cpp src/plugins/platforms/windows/accessible/iaccessible2.h src/plugins/platforms/windows/accessible/qwindowsaccessibility.cpp src/plugins/platforms/windows/accessible/qwindowsmsaaaccessible.cpp src/plugins/platforms/windows/accessible/qwindowsmsaaaccessible.h src/widgets/widgets/qmenu_p.h tests/auto/network/access/qnetworkreply/tst_qnetworkreply.cpp tests/auto/other/qaccessibility/tst_qaccessibility.cpp tests/auto/testlib/selftests/expected_cmptest.lightxml tests/auto/testlib/selftests/expected_cmptest.teamcity tests/auto/testlib/selftests/expected_cmptest.txt tests/auto/testlib/selftests/expected_cmptest.xml Done-with: Edward Welbourne <edward.welbourne@qt.io> Change-Id: I4217cc7d840cbae3e3dd28574741544469c4c6b9
| * | Change almost all other uses of qrand() to QRandomGeneratorThiago Macieira2017-11-086-23/+30
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The vast majority is actually switched to QRandomGenerator::bounded(), which gives a mostly uniform distribution over the [0, bound) range. There are very few floating point cases left, as many of those that did use floating point did not need to, after all. (I did leave some that were too ugly for me to understand) This commit also found a couple of calls to rand() instead of qrand(). This commit does not include changes to SSL code that continues to use qrand() (job for someone else): src/network/ssl/qsslkey_qt.cpp src/network/ssl/qsslsocket_mac.cpp tests/auto/network/ssl/qsslsocket/tst_qsslsocket.cpp Change-Id: Icd0e0d4b27cb4e5eb892fffd14b5285d43f4afbf Reviewed-by: Lars Knoll <lars.knoll@qt.io>
* | | Merge remote-tracking branch 'origin/5.10' into devLiang Qi2017-09-266-13/+87
|\| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Conflicts: src/gui/kernel/qguiapplication.cpp src/platformsupport/input/libinput/qlibinputpointer.cpp src/plugins/platforminputcontexts/ibus/qibusplatforminputcontext.h src/plugins/platforms/cocoa/qcocoawindow.h src/testlib/qtestsystem.h Change-Id: I5975ffb3261c2dd82fe02ec4e57df7c0950226c5
| * | Merge remote-tracking branch 'origin/5.9' into 5.10Liang Qi2017-09-066-13/+87
| |\| | | | | | | | | | | | | | | | | | | | | | | | | | | | Conflicts: examples/opengl/qopenglwidget/main.cpp src/3rdparty/pcre2/src/pcre2_printint.c src/plugins/platforms/cocoa/qnsview.mm src/widgets/widgets/qcombobox.cpp Change-Id: I37ced9da1e8056f95851568bcc52cd5dc34f56af
| | * Hello GL2 example: Fix exit crashFriedemann Kleint2017-09-051-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | Bail out of cleanup() when run 2nd time. Task-number: QTBUG-60626 Change-Id: I8a9be2fcfb0e8a5584ce8ed7952affff24bd2a33 Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>
| | * OpenGL examples: Introduce QCommandLineParserFriedemann Kleint2017-09-056-12/+82
| | | | | | | | | | | | | | | | | | Task-number: QTBUG-60626 Change-Id: I6d102327c89206fcdce10f3ac04e112270b11ad2 Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>
* | | Replace Q_NULLPTR with nullptr where possibleKevin Funk2017-09-191-3/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Remaining uses of Q_NULLPTR are in: src/corelib/global/qcompilerdetection.h (definition and documentation of Q_NULLPTR) tests/manual/qcursor/qcursorhighdpi/main.cpp (a test executable compilable both under Qt4 and Qt5) Change-Id: If6b074d91486e9b784138f4514f5c6d072acda9a Reviewed-by: Ville Voutilainen <ville.voutilainen@qt.io> Reviewed-by: Lars Knoll <lars.knoll@qt.io> Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>
* | | Replace Q_DECL_OVERRIDE with override where possibleKevin Funk2017-09-191-1/+1
|/ / | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Remaining uses of Q_DECL_OVERRIDE are in: src/corelib/global/qcompilerdetection.h src/corelib/global/qglobal.cpp doc/global/qt-cpp-defines.qdocconf (definition and documentation of Q_DECL_OVERRIDE) tests/manual/qcursor/qcursorhighdpi/main.cpp (a test executable compilable both under Qt4 and Qt5) Change-Id: Ib9b05d829add69e98a86238274b6a1fcb19b49ba Reviewed-by: Lars Knoll <lars.knoll@qt.io> Reviewed-by: Ville Voutilainen <ville.voutilainen@qt.io> Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>
* | Merge remote-tracking branch 'origin/5.9' into devSimon Hausmann2017-07-191-8/+6
|\| | | | | | | | | | | | | | | Conflicts: src/corelib/io/qwindowspipewriter.cpp src/widgets/styles/qcommonstyle.cpp Change-Id: I0d33efdc4dc256e234abc490a18ccda72cd1d9e6
| * Examples: Remove remains of winceFriedemann Kleint2017-07-141-8/+6
| | | | | | | | | | | | | | | | | | | | | | Task-number: QTBUG-52590 Task-number: QTBUG-60628 Task-number: QTBUG-60633 Task-number: QTBUG-60635 Task-number: QTBUG-60641 Task-number: QTBUG-60659 Change-Id: I9ffc3e25893d2281b19cc12b70e1a92fb2a8b708 Reviewed-by: Topi Reiniö <topi.reinio@qt.io>
* | Clean up some arithmetic code in an exampleEdward Welbourne2017-07-141-17/+13
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The square root of a sum of squares is easier to read and should be computed more accurately if done for us by hypot(). Variables set only once should be set as an initializer and declared const, to make clear this is what's happening. Loop variables can be local to loops. Adding a value to, or subtracting one from, a multiple of itself just multiplies it be one plus (or minus) the multiplier; assigning the result to the same variable is clearer as a *= (especially when the factors are now overt numeric constants). An array of 16k floats all updated in locksteck to the same value can be replaced by a single float that holds that value. Simple things should not be needlessly made more complicated - especially in example code, which should be pedagogic. Change-Id: Idab585cd7df1399c250d4b9f1396a085ae8f3864 Reviewed-by: hjk <hjk@qt.io>
* | Don’t flicker on startup: render on exposeMorten Johan Sørvig2017-06-272-1/+3
| | | | | | | | | | | | | | | | All QWindow implementations must produce a frame before returning from the expose event. Change-Id: I5640809c47e948101879c1623c12230fa0a63c44 Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
* | Be (somewhat more) consistent about the value of piEdward Welbourne2017-06-208-73/+66
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Use M_PI (and friends), where possible, in favor of hand-coded approximations of various (in)accuracies. Where that's not available (e.g. fragment shaders), use the same value that qmath.h uses for M_PI, for consistency. Replaced math.h with qmath.h in places that defined a fall-back in case math.h omits it (it's not in the C++ standard, although M_PI is in POSIX); or removed this entirely where it wasn't used. Reworked some code to reduce the amount of arithmetic needed, in the process; e.g. pulling common factors out of loops. Revised an example's doc to not waste time talking about using a six-sig-fig value for pi (which we no longer do) - it really wasn't relevant, or anything to be proud of; nor did the doc mention its later use. Task-number: QTBUG-58083 Change-Id: I5a31e3a2b6a823b97a43209bed61a37b9aa6c05f Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
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