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| author | Sean Harmer <sean.harmer@kdab.com> | 2012-09-27 15:24:34 +0100 |
|---|---|---|
| committer | The Qt Project <gerrit-noreply@qt-project.org> | 2012-10-03 17:22:03 +0200 |
| commit | 394249616cbb4c0861a032d33f846f85e2801677 (patch) | |
| tree | d1b7b2b44041be92bbc47f3419866a823ed381c6 /src/opengl | |
| parent | 84100c9085ddc30368582d02a4229d44622f85e2 (diff) | |
OpenGL: Don't request a context version higher than is supported
The function wglCreateContextAttribsARB will fail if we request a
context version higher than is supported. We therefore upper-bound the
requested version by the version of the static context. This results
in context creation succeeding and having the closest possible match
to the requested format.
The xcb qpa plugin is modified to operate similarly to the windows
plugin in that it now creates a "static" context which is used to
limit the versions of contexts requested by the user.
Change-Id: I277ad7cc82edfdf7b9d8502ad921c8175feb1a4a
Reviewed-by: Samuel Rødal <samuel.rodal@digia.com>
Diffstat (limited to 'src/opengl')
| -rw-r--r-- | src/opengl/qgl.cpp | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/src/opengl/qgl.cpp b/src/opengl/qgl.cpp index 147a823431..9b456f6a64 100644 --- a/src/opengl/qgl.cpp +++ b/src/opengl/qgl.cpp @@ -3002,6 +3002,14 @@ bool QGLContext::areSharing(const QGLContext *context1, const QGLContext *contex specified in the constructor; otherwise returns false (i.e. the context is invalid). + If the OpenGL implementation on your system does not support the requested + version of OpenGL context, then QGLContext will try to create the closest + matching version. The actual created context properties can be queried + using the QGLFormat returned by the format() function. For example, if + you request a context that supports OpenGL 4.3 Core profile but the driver + and/or hardware only supports version 3.2 Core profile contexts then you will + get a 3.2 Core profile context. + After successful creation, format() returns the set of features of the created GL rendering context. |